Gas-liquid separator and air conditioning system

A gas-liquid separator includes a first cylinder, a second cylinder and a heat exchange assembly. The first cylinder is surrounded by the second cylinder at a predetermined distance. The heat exchange assembly is arranged between the first cylinder and the second cylinder. The heat exchange assembly includes a collecting pipe. An extension direction of the collecting pipe is parallel to an axial direction of the first cylinder. At least a part of a side wall surface of the first cylinder is formed with an avoidance portion recessed inwardly. At least a part of the collecting pipe is arranged between the avoidance portion and the second cylinder.

The present application is a 35 U.S.C. § 371 National Phase conversion of International (PCT) Patent Application No. PCT/CN2019/101990, filed on Aug. 22, 2019, which claims priority of Chinese Patent Application No. 201821368979.8, filed on Aug. 23, 2018, Chinese Patent Application No. 201810969629.5, filed on Aug. 23, 2018, Chinese Patent Application No. 201810969630.8, filed on Aug. 23, 2018, Chinese Patent Application No. 201810968969.6, filed on Aug. 23, 2018, the disclosure of which is incorporated by reference herein. The PCT International Patent Application was filed and published in Chinese.

TECHNICAL FIELD

This application relates to a field of air conditioning technology, and in particular to a gas-liquid separator and an air conditioning system.

BACKGROUND

In an air conditioning system, an intermediate heat exchanger is often used to exchange heat between the low-temperature refrigerant from the evaporator and the high-temperature refrigerant from the condenser in order to increase the temperature of the refrigerant entering the compressor and lower the temperature of the refrigerant before throttling, thereby increasing the cooling efficiency of the air conditioning system. Usually, most compressors can only compress gaseous refrigerant. If liquid refrigerant enters the compressor, it will cause liquid shock and damage the compressor. In order to avoid the compressor being shocked by liquid refrigerant, it is necessary to install a gas-liquid separator before the compressor.

In addition, different refrigerants have different pressure requirements for the air conditioning systems. Compared with the use of a low-pressure refrigerant, when using a high-pressure refrigerant, the working pressure of the air-conditioning system is greater, and higher requirements are placed on the pressure resistance of the gas-liquid separator, especially higher requirements are placed on the strength of components such as collecting pipes which circulate the high-temperature refrigerant. While ensuring that the flow rate in the pipes is within a reasonable range and is limited by the size of the gas-liquid separator, how to make the strength of the components such as collecting pipes that circulate the high-temperature refrigerant meet the requirements and how to make the structure of the gas-liquid separator more compact, has become an urgent problem to be solved.

SUMMARY

According to a first aspect of embodiments of the present application, a gas-liquid separator is provided. The gas-liquid separator includes a first cylinder, a second cylinder and a heat exchange assembly. The second cylinder is surrounded by the first cylinder at a predetermined distance. The heat exchange assembly is arranged between the first cylinder and the second cylinder. The heat exchange assembly includes a collecting pipe, and an extension direction of the collecting pipe being parallel to an axial direction of the first cylinder. At least a part of a side wall surface of the first cylinder is formed with an avoidance portion recessed inwardly, and at least a part of the collecting pipe is arranged between the avoidance portion and the second cylinder.

According to a second aspect of embodiments of the present application, an air conditioning system is provided. The air conditioning system at least includes a heat exchanger and a compressor which are connected by pipelines. The gas-liquid separator described above is arranged between the heat exchanger and the compressor. The first cylinder is provided with a chamber. An inlet of the chamber is in communication with an outlet of the heat exchanger. An outlet of an interlayer space between the first cylinder and the second cylinder communicates with an inlet of the compressor.

DETAILED DESCRIPTION

Exemplary embodiments will be described in detail here, examples of which are shown in drawings. When the following description refers to the drawings, unless otherwise indicated, the same numerals in different drawings represent the same or similar elements. The examples described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of devices and methods consistent with some aspects of the application as detailed in the appended claims.

The terminology used in this application is only for the purpose of describing particular embodiments, and is not intended to limit this application. The singular forms “a”, “said”, and “the” used in this application and the appended claims are also intended to include plural forms unless the context clearly indicates other meanings.

It should be understood that the terms “first”, “second” and similar words used in the specification and claims of this application do not represent any order, quantity or importance, but are only used to distinguish different components. Similarly, “an” or “a” and other similar words do not mean a quantity limit, but mean that there is at least one. Unless otherwise noted, “front”, “rear”, “lower” and/or “upper” and similar words are for ease of description only and are not limited to one location or one spatial orientation. Similar words such as “include” or “comprise” mean that elements or objects appear before “include” or “comprise” cover elements or objects listed after “include” or “comprise” and their equivalents, and do not exclude other elements or objects. The term “a plurality of” mentioned in the present application includes two or more.

Hereinafter, some embodiments of the present application will be described in detail with reference to the accompanying drawings. In the case of no conflict, the following embodiments and features in the embodiments can be combined with each other.

FIG.1is a schematic view of a perspective structure of a gas-liquid separator of an exemplary embodiment of the present application. The gas-liquid separator can be applied to various refrigeration systems, and is suitable for many fields such as household air conditioners, commercial air conditioners and automobiles. Please refer toFIG.55, a refrigeration system, for example an air conditioning system, is shown. The refrigeration system includes a heat exchanger, a condenser, an expansion valve and a compressor which are connected by pipelines. A gas-liquid separator100is provided between the heat exchanger and the compressor.

As shown inFIG.1, the gas-liquid separator100includes a first cylinder2and a second cylinder3surrounded by the first cylinder2at a predetermined distance. An interlayer space202in which a refrigerant (i.e., a first refrigerant) flows is provided between the first cylinder2and the second cylinder3. At least a part of a side wall of the first cylinder2is recessed inwardly to form an avoidance portion29. The avoidance portion29may be formed by a part of a cylindrical wall of the first cylinder2which is recessed or bent inwardly. In specific implementations, a stamping process can be used to form the avoidance portion29. Of course, other processes can also be used to form the avoidance portion, which is not limited in the present application and can be set according to the specific application environment.

The gas-liquid separator100has a first end101and a second end102which are opposite to each other. Unless otherwise specified, the first end101can be regarded as an upper end, and the second end102can be regarded as a lower end. Among them, the upper end and the lower end are only for convenience of description, and are not limited to one position or one spatial orientation.

In some embodiments, both the first cylinder2and the second cylinder3are hollow cylinders, and an outer diameter of the first cylinder2is smaller than an inner diameter of the second cylinder3. A chamber201is formed in the first cylinder2, and a gas-liquid separation assembly11is provided in the chamber201. Relevant content of the gas-liquid separation assembly11will be described in detail in the following embodiments, and will not be repeated here.

The interlayer space202may be a cavity enclosed by an outer wall surface of the first cylinder2and an inner wall surface of the second cylinder3. Optionally, a lower end surface of the first cylinder2is higher than a lower end surface of the second cylinder3. Correspondingly, the lower end of the first cylinder2is provided with an inner end cover6so as to isolate the chamber201from the interlayer space202.

Furthermore, the gas-liquid separator100includes a heat exchange assembly20arranged in the interlayer space202. The heat exchange assembly20includes flat tubes21and a collecting pipe211arranged at an end of the flat tubes21. The end of the flat tube21is inserted into the collecting pipes211to make an internal space of the flat tube21communicate with an internal space of the collecting pipe211. The collecting pipe211extends in a direction parallel to an axial direction r of the first cylinder2, and at least a part of the collecting pipe211is provided corresponding to the avoidance portion29. This makes the structure of the gas-liquid separator more compact, so that the disposed position of the collecting pipe is offset close to the axis of the first cylinder. That is, the distance between the end of the collecting pipe and the second cylinder is increased, so that an end cover of the gas-liquid separator has enough space to set the joint which is connected to the end of the collecting pipe. In addition, the collecting pipe extends along the axial direction of the first cylinder, and for example, the collecting pipe with an increased pipe diameter may be provided at least partially corresponding to the avoidance portion. At least a part of the collecting pipe is arranged between the avoidance portion and the second cylinder. In this way, when an overall size of the gas-liquid separator remains unchanged, the pressure resistance strength of the collecting pipe increases. The term “corresponding” in the description “the collecting pipe211is provided corresponding to the avoidance portion29” means that at least a part of the avoidance portion29is adjacent to a wall surface on the side of the collecting pipe211, is attached or adjacent to or has a small gap due to manufacturing process with at least part of an outer wall surface of the collecting pipe211. Furthermore, the shape and size of the avoidance portion29are substantially the same as the shape and size of a side of the collecting pipe211adjacent to the avoidance portion29, and the avoidance portion29and the collecting pipe211are mating with each other. Correspondingly, the interlayer space202is a passage for the first refrigerant, and the internal space of the flat tube21is a passage for the second refrigerant. Optionally, the first refrigerant is a low-temperature refrigerant, and the second refrigerant is a high-temperature refrigerant.

In some embodiments, the flat tube21includes a plurality of flat pipes which are arranged in parallel along the same direction and surround the outer wall surface of the first cylinder2. The flat tube21may be attached to the outer wall surface of the first cylinder2, so that heat exchange between the interlayer space202and the flat tube21is realized by the heat radiation from the outer wall surface of the first cylinder2. The second refrigerant passage and the first refrigerant passage of the gas-liquid separator100are provided separately, so that the structure is simplified and there is no risk of mixing of refrigerants in two states in case of pipeline leakage.

In another embodiment, the outer wall surface of the flat tube21is attached to the inner wall surface of the second cylinder3. The flat tube21is spirally wrapped around the inner wall of the second cylinder3or disposed with other cross-sectional shapes.

In other embodiments, the flat tube21is not attached to the outer wall surface of the first cylinder2and the inner wall surface of the second cylinder3, rather than being separated by a certain distance.

For example, in some embodiments, the flat tube21includes a plurality of flat pipes which are arranged side by side. Correspondingly, the flat pipes are inserted into the collecting pipe211. The second refrigerant may flow in a same direction in the flat pipes. Since the flat tube21is arranged in the interlayer space, the second refrigerant flows in the flat pipes. Therefore, the heat of the second refrigerant is exchanged with the first refrigerant in the interlayer space through pipe walls of the flat pipes.

In some embodiments, as shown inFIG.28, the collecting pipes211include a first collecting pipe2110and a second collecting pipe2111which are arranged side by side. One end of the flat tube21is inserted into the first collecting pipe2110, and the other end of the flat tube21is inserted into the second collecting pipe2111. One end of the first collecting pipe2110is provided with a first joint213to flow the second refrigerant out of the first collecting pipe2110or flow the second refrigerant into the first collecting pipe2110. The other end of the first collecting pipe2110is provided with a second joint212to correspondingly flow the second refrigerant into the first collecting pipe2110or flow the second refrigerant out of the first collecting pipe2110. Opposite ends of the second collecting pipe2111are sealed.

Optionally, as shown inFIGS.2,12,14,26,34,46and52, a separator2113is provided in the first collecting pipe2110. The internal space of the first collecting pipe2110is separated into two independent first chamber2115and second chamber2116in order to increase the process of the second refrigerant. Among them, the first chamber2115is located below the second chamber2116. Correspondingly, a part of the flat tube21communicates with the first chamber2115and an inner space of the second collecting pipe2111, and the other part of the flat tube21communicates with the second chamber2116and the inner space of the second collecting pipe2111.

In some embodiments, as shown inFIGS.2,3,11and12, the gas-liquid separator includes a first end cover4covering the upper ends of the first cylinder2and the second cylinder3. The first end cover4is provided with a first through hole410corresponding to the first collecting pipe2110. During specific installation, at least a part of the first joint213is installed in the first through hole410.

In other embodiments, as shown inFIGS.1,13to15and20, the upper end of the second cylinder3is welded to the first end cover4, and the upper end of the first cylinder2abuts against the first end cover4. Correspondingly, the first end cover4is provided with a bend channel41communicating with an internal cavity of the collecting pipe211. The bend channel41extends through the upper and lower surfaces of the first end cover4. The bend channel41includes a first opening4111on an upper surface of the first end cover4and a second opening4121on a lower surface of the first end cover4. Correspondingly, at least a part of the first joint213is disposed in the first opening4111. A central axis of the first opening4111and a central axis of the second opening4121both extend substantially in a vertical direction, and the central axes are not in a same straight line. The first opening4111is arranged closer to a center of the first end cover4than the second opening4121. That is, the first opening4111is disposed on an inner side of the first end cover4as a whole relative to the second opening4121, so that the bend channel41moves inwardly for a certain distance along a bottom-to-top direction. This is beneficial to the arrangement of the collecting pipe211, especially the arrangement of an end device of the collecting pipe211, for example, the arrangement of the first joint213. In this way, limited by the size of the gas-liquid separator, the first end cover has enough space to install the end device of the collecting pipe, such as the first joint of the collecting pipe etc., thereby making the collecting pipe easy to install and ensure that the pressure resistance strength of the collecting pipe and the flow velocity in the collecting pipe are within a reasonable range.

In some embodiments, as shown inFIGS.14and20, the bend channel41includes a first section411extending vertically and downwardly from the first opening4111for a predetermined distance, a second section412extending vertically and upwardly from the second opening4121for a predetermined distance, and a third section413communicating the first section411and the second section412. Correspondingly, the first section411and the second section412are staggered, and a distance between the first section411and a center of the first end cover4is smaller than a distance between the second section412and the center of the first end cover4. That is, the first section411is closer to the center of the first end cover4than the second section412. Specifically, at least a part of the first joint213is disposed at the first section411.

In some embodiments, as shown inFIGS.13,14, and17to24, the first end cover4includes a body portion401connected to the second cylinder3and a pressing cover402disposed on a side of the body portion401away from the second cylinder3. The first section411extends through upper and lower surfaces of the pressing cover402. The third section413and the second section412communicating with each other are provided in the body portion401. The third section413extends through an upper surface of the body portion401. The second section412extends through a lower surface of the body portion. Among them, in some embodiments, the body portion401and the pressing cover402may be independently provided. Of course, in other embodiments, the body portion401and the pressing cover402may also be integrally provided.

In some embodiments, the third section413is an inclined channel. Take the body portion401and the pressing cover402as two independent components as an example for description, optionally, in some embodiments, the third section413is provided with an inclined step surface415on a side close to the center of the first end cover4. A protrusion416extending downwardly is provided on a side of the pressing cover402close to the body portion401. During specific installation, the protrusion416at least partially protrudes into the third section413and is arranged opposite to the step surface415. The inclined step surface415and/or the inclined surface of the protrusion416form an inclined side wall of the inclined channel (referring toFIGS.17to20).

Optionally, in other embodiments, two opposite blocks414may be provided in the third section413. One of the blocks414is arranged on a side of the third section413close to the center of the first end cover4, and the other block414is arranged on a side of the third section413away from the first end cover4. The inclined surfaces of the two blocks414form an inclined side wall of the inclined channel (referring toFIGS.21and22). In some embodiments, the block414can be connected with other parts of the first end cover4by means of brazing, which facilitates the assembly of the gas-liquid separator100. The inclined channel is formed by adding the blocks414, whereby the process is simple and the production is easier.

In some embodiments, the third section413includes a strip groove4130extending in a radial direction of the first end cover. The strip groove4130includes a first groove portion4131and a second groove portion4132. The first groove portion4131is closer to the center of the first end cover4than the second groove portion4132. Among them, the first groove portion4131communicates with the first section411located above the first groove portion4131. The second groove portion4132communicates with the second section412located below the second groove portion4132(referring toFIGS.23and24). Specifically, the strip groove4130includes a strip opening4133. The strip groove4130can be formed by extending a predetermined distance directly below from the strip opening4133. The strip groove4130can be directly milled by a groove milling device, of which the process is simple and easy to operate.

Further, in some embodiments, a welding boss417corresponding to the second section412is provided below the second section412(referring toFIG.25). The welding boss417is approximately ring-shaped, and the upper end of the collecting pipe211is disposed in the welding boss417. The welding boss417can be integrally formed with the first end cover4, or can be set independently. The setting of the welding boss417can effectively increase the welding area between the collecting pipe and the first end cover, thereby improving the welding strength, making the gas-liquid separator have a higher burst pressure, such as 40 MPa, and improving the stability of the welding quality.

Specifically, in some embodiments, as shown inFIGS.15and16, an outer contour shape of the body portion401of the first end cover4is generally of a stepped configuration. The body portion401includes a first covering portion4011located on an upper location for covering the second cylinder3, and a second covering portion4012extending downwardly from the inner side of the first covering portion4011for covering the first cylinder2. In addition, a side of the second covering portion4012adjacent to the bend channel41is provided with a notch, for example, a flat portion, so that the body portion401has enough space for the second section412. Correspondingly, the welding boss417can be connected to the body portion401by welding or the like. Of course, the welding boss417can also be integrally formed with the body portion401. The present application does not limit this, and it can be set according to the specific application environment.

The first end cover4is also provided with a first port42communicating with the chamber201. Optionally, the first port42may include a first section portion421and a second section portion422which form the first port42. Among them, the first section portion421is located on the body portion401and extends through the upper and lower surfaces of the body portion401, and the second section portion422is located on the pressing cover402and extends through the upper and lower surfaces of the pressing cover402(referring toFIGS.18,21and23). In addition, a first connecting pipe103may be provided in the first port42to flow the first refrigerant into the chamber201.

In some embodiments, as shown inFIGS.1,2,3,11and12, the gas-liquid separator includes a second end cover5covering a lower end of the second cylinder3. The second end cover5is provided with a second through hole510corresponding to the first collecting pipe2110. During specific installation, at least a part of the second joint212is installed in the second through hole510.

In other embodiments, the second end cover5is also provided with a bend passage51communicating with the lower end of the collecting pipe211. During specific installation, at least a part of the second joint212is installed in an outlet of the bend passage51near a lower end thereof.

The second end cover5is also provided with a second port52communicating with the interlayer space202. Similarly, a second connecting pipe104may also be provided in the second port52, and the first refrigerant that has undergone heat exchange in the interlayer space202can be led out through the second connecting pipe104.

The second end cover5and the inner end cover6are separated by a predetermined distance. Correspondingly, the second port52can be arranged at a center of the second end cover5or adjacent to the center of the second end cover5. Of course, the second port52can also be arranged in other positions of the second end cover5, which is not limited in the present application and it can be set according to specific application environment. Correspondingly, the second port52is an outlet of the interlayer space202, which can be used as an outlet of the first refrigerant.

Further, in some embodiments, as shown inFIGS.3to8B, the avoidance portion29extends from one end of the first cylinder2to the other end of the first cylinder2in a direction parallel to the axial direction of the first cylinder2. Compared with a gas-liquid separator without the avoidance portion29, an arrangement position of the collecting pipe is offset close to the axis r of the first cylinder (as shown inFIG.3). That is, a distance between the collecting pipe and the axis r of the first cylinder (as shown inFIG.3) becomes smaller. Correspondingly, as shown inFIGS.2and3, a distance between the first through hole410and the center of the first end cover4is also smaller, so that the first end cover4has enough space for the first joint213. Moreover, under the condition that the overall size of the gas-liquid separator remains unchanged, at least a part of the collecting pipe is provided between the avoidance portion and the second cylinder. For example, the collecting pipe with an increased pipe diameter can be arranged corresponding to the avoidance portion, thereby ensuring the pressure resistance strength of the collecting pipe. In the same way, the second end cover5has enough space to install the second joint212.

An offset distance of the collecting pipe to the axis r of the first cylinder is related to the size of the avoidance portion29(i.e., a depth of the recess). During specific implementation, the size of the avoidance portion29can be adjusted to suit the installation of different sizes of collecting pipes and joints (including the first joint and the second joint).

Both ends of the avoidance portion29can be provided with openings to facilitate the installation of the collecting pipe. For example, taking the first cylinder2shown inFIG.4Aas an example, an opening2911is provided at an upper end of the avoidance portion29, and an opening2912is provided at a lower end of the avoidance portion29. This arrangement is applicable to an embodiment in which the first joint213and the second joint212are respectively arranged at both ends of the gas-liquid separator100.

In some embodiments, the upper end of the first cylinder2is open, and the lower end is provided with a blocking portion28that closes the first cylinder2. For example, a portion where the lower end of the first cylinder2and the blocking portion28are connected is formed as an edge283. For example, as shown inFIG.6, the avoidance portion29includes a first avoidance portion295extending from the open upper end of the first cylinder2to the lower end of the first cylinder2or the edge283along the axial direction r parallel to the first cylinder2. The avoidance portion29also includes a second avoidance portion281located in the blocking portion28and corresponding to the first avoidance portion295. The second avoidance portion281may be in alignment with the first avoidance portion295. Correspondingly, the upper end of the avoidance portion29is provided with an opening2951, and the lower end of the avoidance portion29is provided with an opening2811.

For another example, as shown inFIG.7, the avoidance portion29includes a first avoidance portion296extending from the open upper end of the first cylinder2to the lower end of the first cylinder2or the edge283along the axial direction r parallel to the first cylinder2. The avoidance portion29also includes a second avoidance portion282located in the blocking portion28and corresponding to the first avoidance portion296. The second avoidance portion282may be in alignment with the first avoidance portion296.

The second avoidance portion281and the first avoidance portion295may also include aligned planes, which is not limited in the present application, and it may be set according to specific application environment. It should be noted that in some embodiments, the blocking portion28can be understood as the inner end cover6.

Of course, the avoidance portion29may be open at one end and closed at the other end. This arrangement is applicable to an embodiment in which both the first joint213and the second joint212are arranged at the first end101. This application does not limit this, and it can be set according to the specific application environment.

In some embodiments, the avoidance portion29includes a groove extending in a direction parallel to the axial direction r of the first cylinder2.

For example, as shown inFIGS.4A and4B, the avoidance portion29may include a first groove291. Taking the collecting pipe211including the first collecting pipe2110and the second collecting pipe2111arranged in parallel as an example, the aforementioned collecting pipe211is provided corresponding to the avoidance portion29. That is, it can be understood that the first collecting pipe2110and the second collecting pipe2111may be partially or completely disposed in the first groove291. Compared with a gas-liquid separator without the avoidance portion29, a distance between the first collecting pipe2110and the axis r of the first cylinder2and a distance between the second collecting pipe2111and the axis r of the first cylinder2are smaller. Correspondingly, a distance between the first through hole410and the center of the first end cover4is also smaller, and a distance between the second through hole510and the center of the second end cover5is also smaller, or the bend channels of the first end cover and the second end cover move inwardly a certain distance along the bottom-to-top direction (as shown inFIGS.13to15andFIG.20). In this way, the first end cover4has enough space for the first joint213and the second end cover5has enough space for the second joint212, which facilitates the installation of the first joint213and the second joint212.

Alternatively, as shown inFIGS.5A and5B, the avoidance portion29may include a second groove2921and a third groove2922which are adjacent to each other. In addition, the second groove2921and the third groove2922have a common rib. Similarly, taking the collecting pipe211including the first collecting pipe2110and the second collecting pipe2111arranged in parallel as an example, the aforementioned collecting pipe211is disposed corresponding to the avoidance portion29. That is, it can be understood that at least a part of the first collecting pipe2110can be disposed in the second groove2921, and at least a part of the second collecting pipe2111can be disposed in the third groove2922. That is, the second groove2921corresponds to the first collecting pipe2110, and the third groove2922may correspond to the second collecting pipe2111. In this way, it is beneficial to ensure the volume of the chamber201. It should be noted that the depth and degree of curvature of the second groove2921and the third groove2922can be set corresponding to pipe diameters of the first collecting pipe2110and the second collecting pipe2111.

Correspondingly, in the embodiment shown inFIG.7, the first avoidance portion296includes a groove2961and a groove2962which are arranged adjacently with each other. The second avoidance portion282includes a groove2821corresponding to the groove2961and a groove2822corresponding to the groove2962.

It should be noted that the groove included in the avoidance portion29may also have other curved shapes. The present application does not limit this, and it can be set according to the specific application environment.

Optionally, as shown inFIGS.8A and8B, the avoidance portion29includes a first straight wall293extending in a direction parallel to the axial direction r of the first cylinder2. Therefore, the aforementioned collecting pipe211is provided corresponding to the avoidance portion29, which can be understood as the collecting pipe211being provided adjacent to the first straight wall293. The collecting pipe211may be or not be attached to the first straight wall293.

In other embodiments, as shown inFIG.9, the avoidance portion29may include a first plane2941formed by extending a certain distance (for example, a preset distance) from the upper end to the lower end of the first cylinder2, and a slope surface2942connecting a lower end of the first plane2941(referring toFIG.9). Of course, in some other embodiments, the first plane can also be replaced by an arc-shaped concave surface so as to form a groove accordingly. Compared with a gas-liquid separator without the avoidance portion29, a sufficient space can be reserved at the position of the first end cover4corresponding to the avoidance portion29in order to provide the first through hole410or the bend channel41with a relatively large diameter, thereby facilitating the installation of the first joint. The aforementioned collecting pipe211is provided corresponding to the avoidance portion29, which can be understood as being provided adjacent to the first plane2941and the slope surface2942.

In other embodiments, in addition to the first plane2941and the slope surface2942described above, the avoidance portion29may also include a second plane2943extending downwardly from the lower end of the slope surface2942(referring toFIG.10). The second plane2943may be a straight wall surface. Of course, in some other embodiments, the second plane2943can also be replaced by an arc-shaped concave surface in order to form a groove accordingly.

Furthermore, a heat dissipation member23is provided in the interlayer space202to enhance heat exchange. In some embodiments, a side of the flat tube21facing the outer wall surface of the first cylinder2and a side of the flat tube21facing the inner wall surface of the second cylinder3are both provided with the heat dissipation members23. That is, the heat dissipation members23are provided on both sides of the flat tube21. Among them, the heat dissipation members23can be brazed to the outer wall surface of the first cylinder2and the inner wall surface of the second cylinder3, respectively; or can be brazed to both sides of the flat tube21, respectively. Of course, the heat dissipation member can also be provided only on one side of the flat tube. Among them, the heat dissipation member can be brazed to the outer wall of the first cylinder, or the heat dissipation member is brazed to the inner wall of the second cylinder, or the heat dissipation member is brazed to one of the two sides of the flat tube. Of course, the heat dissipation member23can also be arranged in other ways, or it can only be in contact with the outer wall surface of the first cylinder, or the inner wall surface of the second cylinder, or the outer wall of the flat tube21. This application does not limit the number and the setting method of the heat dissipation member, which can be set according to the specific application environment.

As shown inFIGS.29A,33,36and38, the heat exchange assembly20includes a first heat dissipation member231disposed on a side of the flat tube21facing the outer wall of the first cylinder2, and a second heat dissipation member232disposed on a side facing the inner wall of the second cylinder3. In the present application, unless otherwise specified, the first heat dissipation member231and the second heat dissipation member232may be collectively referred to as the heat dissipation member23.

In this embodiment, the heat dissipation member23is formed by connecting a plurality of flake units substantially in the shape of “” in order to increase the heat dissipation area. The protrusions of any two adjacent columns or rows in the “”-shaped flake units are arranged in staggered manner. This effectively increases the disturbance to the heat exchange refrigerant, and at the same time increases the resistance of the first refrigerant to flow to the second cavity2022as described below.

As shown inFIGS.28and29, a baffle220is sleeved on the outside of the collecting pipe211in order to prevent the refrigerant from directly flowing out of the interlayer space202via a space outside the collecting pipe211. That is, the baffle220is configured to allow the refrigerant to flow through the heat dissipation member23while blocking the refrigerant from flowing out through a space formed by the collecting pipe211, an outer wall of the first cylinder2and an inner wall of the second cylinder3. In this way, compared with the collecting pipe with no baffle arranged outside thereof, the baffle in this embodiment can prevent the outside of the collecting pipe from forming a bypass channel that facilitates the circulation of refrigerant, thereby improving the heat exchange efficiency of the gas-liquid separator.

The baffle may be or not be connected to the heat dissipation member23. This application does not limit this, and it can be set according to the specific application environment.

In some embodiments, the baffle220includes a first baffle221connected to the upper end of the heat dissipation member23(referring toFIGS.29A,29B and29C) so as to prevent part of the first refrigerant entering the interlayer space from directly passing through the space outside of the collecting pipe211. For example, the space can be a space formed by the collecting pipe211, the out wall of the first cylinder2and the inner wall of the second cylinder3. The first refrigerant flows to a lower end and then flows out of the interlayer space. In other words, the first refrigerant is allowed to flow through the outside of the heat dissipation member23and the flat tube21to the maximum, thereby helping to improve the heat exchange efficiency of the gas-liquid separator100. Specifically, the interlayer space202can be understood as including a first cavity2021for arranging the flat tube and the heat dissipation member23, and a second cavity2022for accommodating the collecting pipe211(referring toFIG.32). Then, the first cavity2021is a passage for the first refrigerant. The aforementioned avoidance portion29can be understood as a part of the first cylinder2for forming the second cavity2022. Moreover, the arrangement of the first baffle221can prevent the first refrigerant from entering the second cavity2022, thereby the heat exchange efficiency of the heat exchange assembly is improved.

During specific installation, the connection between the first baffle221and the heat dissipation member23may partially overlap. A lower end surface of the first baffle221is connected to an upper end of the heat dissipation member23. In some embodiments, a height of the heat dissipation member23and a height of the flat tube21are substantially the same. That is, upper ends of the heat dissipation member23and the flat tube21are substantially flush, and lower ends of the heat dissipation member23and the flat tube21are also substantially flush. The lower end surface of the baffle221can be connected with the upper end surface of the flat tube21. Of course, the first baffle221can also just abut against the heat dissipation member23without overlapping with the heat dissipation member23. Optionally, the first baffle221can also be arranged slightly downwards, for example, the first baffle221is connected to an upper half of the heat dissipation member23.

As shown inFIG.31, the first baffle221includes a baffle main body2201and a mounting hole2202for receiving the collecting pipe211. In some embodiments, the mounting hole2202can be attached to the outer wall of the collecting pipe211. The specific shape of the mounting hole2202can be determined according to the cross-sectional shape of the outer wall of the collecting pipe, which is not limited in this application. Of course, if there is a narrow gap between the mounting hole and the outer wall of the collecting pipe due to the production process etc., this has little effect on the flow of the first refrigerant, thereby it should be understood that it is also within the protection scope of this application.

The first baffle221has an outer side surface2203attached to the inner wall surface of the second cylinder3and an inner side surface2204attached to the outer wall of the first cylinder2. In some embodiments, the outer side surface2203is an arc-shaped curved surface which can be closely attached to the second cylinder3to further improve the shielding effect of the first baffle221, thereby further improving the heat exchange efficiency of the gas-liquid separator.

Optionally, in addition to the first baffle221sleeved on the outside of the collecting pipe211, the collecting pipe211is also sleeved by a second baffle222connected to a lower end of the heat dissipation member23, as shown inFIGS.28and29A. The structure of the second baffle222may be substantially the same as the structure of the first baffle221. In addition, the arrangement of the second baffle222may be the same as the arrangement of the first baffle221, and reference may be made to the above related description, which will not be repeated here.

Optionally, as shown inFIG.33, at least one third baffle228may be provided between the first baffle221and the second baffle222to further increase the baffle effect. The structure of the third baffle228and the structure of the first baffle221may be substantially the same. This application does not limit the number of baffles and the specific setting methods and positions, which can be set according to the specific application environment.

In other embodiments, the baffle220includes an outer baffle223(referring toFIGS.36to41). The outer baffle223includes a first baffle portion2231which extends along a length direction of the collecting pipe211and is connected to a side end of the heat dissipation member23, a second baffle portion2232which is clamped to the upper end of the heat dissipation member23, and a third baffle portion2233which is clamped to a lower end of the heat dissipation member23. At least a part of the outer wall of the first baffle portion2231is attached to the inner wall of the second cylinder3. The first baffle portion2231is specifically connected to the side end of the second heat dissipation member232. The first baffle portion2231, the second baffle portion2232and the third baffle portion2233may be integrally formed or formed by splicing. The second baffle portion2232and the third baffle portion2233have substantially the same structure. Optionally, the second baffle portion2232and the third baffle portion2233have substantially the same structure as the first baffle221described above. Correspondingly, the second baffle portion2232and the third baffle portion2233have mounting holes2235for receiving the collecting pipe211.

On the outer baffle223, the first baffle portion2231is arranged to help prevent the first refrigerant from flowing from the side end of the second heat dissipation member232to the collecting pipe211. The second baffle portion2232and the third baffle portion2233are arranged to facilitate blocking the flow of the first refrigerant from the upper and lower ends of the first baffle portion2231to the collecting pipe211.

Optionally, the outer baffle223includes at least one fourth baffle portion2234located between the second baffle portion2231and the third baffle portion2233. The structure of the fourth baffle portion2234and the second baffle portion2232are substantially the same.

Optionally, as shown inFIGS.42to44, the baffle220includes an inner baffle224. At least a part of the side wall of the inner baffle224is attached to the outer wall of the first cylinder2. The inner baffle224can be arranged in a receiving space2023as shown inFIG.37, and the inner baffle224and the outer baffle223are arranged oppositely. The receiving space2023is enclosed by the avoidance portion29and the outer side wall of the collecting pipe211. The inner baffle224includes a fifth baffle portion2241extending along the length direction of the collecting pipe211and connected to the side end of the first heat dissipation member231, and a sixth baffle portion2242and a seventh baffle portion2243provided at both ends of the fifth baffle portion2241. The sixth baffle portion2242and the seventh baffle portion2243both extend toward a side where the collecting pipe is located, and can be attached to the outer wall of the collecting pipe211.

Correspondingly, the sixth baffle portion2242includes side surfaces2042,2043attached to the collecting pipe211and a side surface2041facing the side of the first cylinder2. The side surfaces2042,2043are generally curved. The shape of the side surface2041can be set according to the shape of the first cylinder2. For example, the side surface2041may be substantially flat in order to fit with the avoidance portion29. Of course, if the first cylinder2is in the shape of a hollow cylinder, that is, when the first cylinder2is not provided with the avoidance portion29, the side surface2041can be a concave curved surface similar to the side surface2042in order to adhere to the outer wall of the first cylinder2. Correspondingly, for the side wall of the fifth baffle portion2241facing the first cylinder2, the wall surface of the side wall and the side surface2041may be substantially in the same plane, or may be set according to the specific shape and structure of the outer wall of the first cylinder2.

Optionally, the inner baffle224includes at least one eighth baffle portion2244located between the sixth baffle portion2242and the seventh baffle portion2243. The structure of the eighth baffle portion2244and the sixth baffle portion2242are substantially the same.

In some embodiments, as shown inFIGS.45and46, the first end cover4has a first welding port4011for welding with the second cylinder3. The first welding port4011is located at an outer edge of the first end cover4, and the first welding port4011can be ring-shaped to fit with the upper end of the second cylinder3. The connection between the bottom of the second cylinder3and the second end cover5further includes a third welding port4022. The third welding port4022may be chamfered, as shown inFIG.46. The chamfered third welding port4022is formed by the bottom end surface of the second cylinder3and the outer peripheral side surface of the second end cover5. A sealing element7is sandwiched between the first cylinder2and the first end cover4. The sealing element7is in contact with the first cylinder2and the first end cover4so as to seal the first cylinder2. The upper end of the second cylinder3is welded to the first end cover4. Since the chamber201is in communication with the interlayer space202, for example, through a channel43described below, the pressure on the inner and outer sides of the first cylinder2is equal. The sealing element7contacts the first cylinder2and the first end cover4in order to seal the first cylinder, which can well meet the structural requirements. In addition, the structure of the sealing element7is simple, and it is easy to produce and install. Especially compared to connecting the first cylinder2and the first end cover4by welding, the installation of the sealing element7will not be adversely affected due to the limited size of the gas-liquid separator100. That is, when there are many components of the gas-liquid separator, compared to the installation of the components of the gas-liquid separator by welding, the sealing element in the embodiment of the present application makes the installation between the first cylinder2and the first end cover4simple and easy to operate. The first cylinder2and the first end cover4do not need to be welded, which reduces the total number of welding, thereby it is beneficial to save installation time and improve the overall installation efficiency of the gas-liquid separator100. In addition, since the chamber inside the first cylinder and the interlayer space outside the first cylinder are communicated, the air pressure on both sides of the inside and outside of the first cylinder is consistent. Sealing by the sealing element contacting the first end cover and the first cylinder can well meet the overall requirements of the structure. Moreover, because the air pressure on both sides of the inner and outer sides of the first cylinder is consistent, only a small pressing force is required to meet the installation requirements during installation.

In some embodiments, the sealing element7is a sealing ring, such as a rubber sealing ring. This application does not limit this, and it can be set according to specific applications.

Taking the sealing element7as a sealing ring as an example, the cross-sectional shape of the sealing ring can be one or a combination of a circle, a rectangle, an ellipse, and the like.

For example, as shown inFIGS.34,35and49, in the case where the first end cover4does not include a pressing cover, the first end cover4includes a first covering portion4013which covers the second cylinder3, and a second covering portion4023which extends downwardly from the first covering portion4013and covers the first cylinder2. As shown inFIG.49, the first covering portion4013has a second welding port4012located below the first through hole410and communicating with the first through hole410. The first collecting pipe2110and the first end cover4are connected by welding at the second welding port4012. The second welding port4012can be regarded as two holes independent of the first through hole410. Of course, in other embodiments, the second welding port can also be regarded as part of the first through hole. In addition, the aforementioned first welding port4011is specifically located at an outer edge of the first covering portion4013.

Optionally, in some embodiments, as shown inFIG.47, the second covering portion402is provided with an installation groove4021, and the sealing element7is disposed in the installation groove4021. In other embodiments, the sealing element7can also be directly arranged on the upper end of the first cylinder2, and the first cylinder2is directly abutted to the lower end of the second end cover5through the sealing element7. Of course, the sealing element7can also be provided in other ways, which is not limited in this application, and it may be set in a specific application environment.

In some embodiments, as shown inFIGS.1,45,46, and50to53, a side of the second end cover5facing the first cylinder2is provided with a boss53which is capable of abutting against the bottom of the first cylinder. The boss53can be integrally formed with the second end cover5, or can be arranged on the second end cover5by a connection method such as welding. The boss53serves as a pressure block so that the pressing force acting on the second end cover5can be transmitted to the first cylinder2through the boss53during installation. The arrangement of the boss53facilitates the installation of the first cylinder2.

In other embodiments, as shown inFIG.51, in addition to the boss53provided between the second end cover5and the first cylinder2, a spacer54is also provided. The spacer is arranged on the boss53and can abut against the lower end of the first cylinder2. The material of the spacer54may be an elastic material such as rubber. This makes it possible to greatly improve the anti-vibration performance of the gas-liquid separator when the liquid refrigerant is stored in the first cylinder2, especially when there is more liquid refrigerant in the first cylinder2, which is beneficial to improve the stability of the gas-liquid separator. At the same time, the combination of the spacer54and the boss53can also transmit the pressing force to the first cylinder2.

In other embodiments, the side of the second end cover5facing the first cylinder2is provided with a spacer which is capable of abutting against the cylinder bottom of the first cylinder2. For example, the side of the second end cover5facing the first cylinder2is not provided with a boss, which can transmit the pressing force to the first cylinder and can improve the anti-vibration performance of the gas-liquid separator. This application does not limit the setting of the boss and the spacer, and it can be set according to the specific application environment.

Further, referring back toFIGS.1to3, the gas-liquid separation assembly11includes a gas guide tube111, a sleeve112sleeved around the outside of the gas guide tube111, and a cap113sleeved on an upper part of the gas guide tube111and located above the sleeve112.

For example, as shown inFIGS.14,34and35, the cap113includes a main body portion1131sleeved on the gas guide tube111and an extension portion1132extending downwardly along an outer edge of the main body portion1131. A gap is formed between an upper surface of the main body portion1131and a lower surface of the first end cover4so that the first refrigerant can flow from the first connecting pipe103into the chamber201. A gap is formed between an outer wall surface of the extension portion1132and an inner wall surface of the first cylinder2so that the first refrigerant continues to flow downwardly after entering the chamber201from the first connecting pipe103. A gap is formed between a lower surface of the main body portion1131and an upper end surface of the sleeve112, a gap is formed between an inner wall surface of the extension portion1132and an outer wall of the sleeve112, and an upper end of the sleeve112is open so that the chamber201is in communication with a passage115described below.

An inner wall surface of the sleeve112and an outer wall surface of the gas guide tube111are separated by a predetermined distance, so that the passage115for the first refrigerant to flow is formed between the inner wall surface of the sleeve112and the outer wall surface of the gas guide tube111. A lower end of the sleeve112is disposed on the inner end cover6(here the inner end cover6can be replaced by the blocking portion28), and is connected to the inner end cover6. For example, the lower end of the sleeve112abuts against the inner end cover6so as to be sealed, thereby isolating a lower end of the passage115from the chamber201. A gap is left between a lower end surface of the gas guide tube111and the inner end cover6so that the passage115communicates with inside of the gas guide tube111.

As shown inFIGS.3,14to16,20,22,24,34and46, the first end cover4is provided with a channel43extending in a radial direction of the first end cover4, and an upper end of the gas guide tube111is inserted inside the first end cover4. One end of the channel43communicates with an inner space of the gas guide tube111, and the other end communicates with the interlayer space202. Among them, the number of channels43may include at least one. A collecting hole44is provided at a lower end of the first end cover4, and at least one channel43converges in the collecting hole44. Correspondingly, the upper end of the gas guide tube111is inserted into the collecting hole44so that the channel43communicates with the inner space of the gas guide tube111.

Furthermore, as shown inFIGS.1,45and46, a molecular sieve8may also be provided in the first cylinder2. The molecular sieve8is disposed in the chamber201, for example, the molecular sieve8can be connected to the gas-liquid separation assembly11.

In some embodiments, as shown inFIG.11, when the gas-liquid separator includes the avoidance portion, and when the gas-liquid separator100is specifically working, the flow direction of the first refrigerant is the direction indicated by arrows inFIG.11. The first refrigerant flows from the first connecting pipe103into the chamber201, and continues to flow downwardly through the gap between the extension portion1132and the inner wall surface of the first cylinder2. After that, the first refrigerant sequentially flows through the gap between the inner wall surface of the extension portion1132and the outer wall surface of the sleeve112, the gap between the lower surface of the main body portion1131and the upper end surface of the sleeve112, and then enters the passage115from the upper end of the sleeve112and continues to flow downwardly in the passage115. After that, the first refrigerant enters the gas guide tube111from the lower end of the gas guide tube111and continues to flow upwardly in the gas guide tube111. After that, the first refrigerant enters the interlayer space202through the channel43and continues to flow downwardly. Finally, the first refrigerant flows out of the gas-liquid separator100through the second connecting pipe104to enter the compressor. As a result, the first refrigerant completes the entire process of gas-liquid separation and heat exchange. When the first refrigerant flows in the interlayer space202, it exchanges heat with the second refrigerant in the flat tube21through the tube wall of the flat tube21and the heat dissipation member23.

It should be noted that the first refrigerant that enters the chamber201from the first connecting pipe103is usually a gas-liquid mixed first refrigerant. After entering the chamber201, the liquid first refrigerant sinks due to gravity, while the gaseous first refrigerant floats up and enters the passage115from the upper end of the sleeve112so as to achieve gas-liquid separation of the first refrigerant.

In the case where the gas-liquid separator includes the avoidance portion, the flow direction of the second refrigerant is the direction indicated by arrows inFIG.12. The second refrigerant enters the first chamber2115from the second joint212which is provided in the second through hole510. Then, the second refrigerant flows into the second collecting pipe2111through the flat tube21which is in communication with the first chamber2115. Then, the second refrigerant flows upwardly in the second collecting pipe2111. After that, the second refrigerant flows into the second chamber2116through a part of the flat tube21. Finally, the second refrigerant flows out through the first joint213provided in the first through hole410. As a result, the second refrigerant completes the heat exchange process.

In some embodiments, as shown inFIG.26, when the gas-liquid separator100includes the avoidance portion29, and the first end cover4includes the pressing cover402and the body portion401, when the gas-liquid separator100is specifically working, the flow direction of the first refrigerant is the direction indicated by arrows inFIG.26. The working principle of the gas-liquid separator100when the first refrigerant is circulating is the same as that described above, which will not be repeated here.

In the case where the gas-liquid separator includes the avoidance portion29, and the second end cover5includes the pressing cover and the body portion, the flow of the second refrigerant is in the direction indicated by arrows inFIG.27. The second refrigerant enters the first chamber2115from the second joint212provided in the bend passage51, then flows into the second collecting pipe2111through the flat tube21communicating with the first chamber2115, and then flows upwardly in the second collecting pipe2111. After that, the second refrigerant flows into the second chamber2116through a part of the flat tube21. Finally, the second refrigerant flows out through the first joint213provided in the bend channel41. As a result, the second refrigerant completes the heat exchange process.

In some embodiments, as shown inFIG.34, when the gas-liquid separator100includes the avoidance portion29and the baffle220, and when the gas-liquid separator100is specifically working, the flow direction of the first refrigerant is the direction indicated by arrows inFIG.34. In addition, the working principle of the gas-liquid separator100when the first refrigerant and the second refrigerant are circulating is the same as that described above, which will not be repeated here.

In some embodiments, as shown inFIG.52, when the gas-liquid separator100includes the avoidance portion29, the sealing element7and the boss53, and when the gas-liquid separator100is specifically working, the flow direction of the first refrigerant is the direction indicated by arrows inFIG.52. The working principle of the gas-liquid separator100when the first refrigerant is circulating is the same as that described above, which will not be repeated here.

In the case where the gas-liquid separator100includes the avoidance portion29, the sealing element7and the boss53, the flow direction of the second refrigerant is the direction indicated by arrows inFIG.53. The working principle of the gas-liquid separator100when the second refrigerant is circulating is the same as that describe above, which will not be repeated here.

In the air conditioning system provided by the embodiment of the present application, as shown inFIG.55, an outlet of the heat exchanger can be specifically connected with the first port42of the above-mentioned gas-liquid separator100, and an inlet of the compressor can be specifically connected with a second port52of the aforementioned gas-liquid separator.

In addition, this application also provides a method for manufacturing the gas-liquid separator. The manufacturing method provides a first cylinder2, a second cylinder3, a first end cover4, a second end cover5and a sealing element7. The specific structure of the first cylinder2, the second cylinder3, the first end cover4, the second end cover5, the gas-liquid separation assembly11and the heat exchange assembly20can be referred to the relevant description of the aforementioned embodiment, which will not be repeated here. These parts or components can be assembled through the following steps S103, S105and S107. The specific steps103to107are as follows.

In step S103, the sealing element7is disposed between an end of the first cylinder2and a lower end of the first end cover4, wherein the sealing element7is in contact with the end of the first cylinder2and the lower end of the first end cover4.

In step S105, the second end cover5is disposed at an opposite end of the first end cover4.

In step S107, the second cylinder3surrounds an outer peripheral of the first cylinder2, and the connection between the second cylinder3and the first end cover4and the connection between the second cylinder3and the second end cover5are welded, respectively. Argon arc welding can be used for welding here.

In addition, in some embodiments, as shown inFIG.57, the manufacturing method further provides a heat exchange assembly20. Correspondingly, before step S105, the manufacturing method further includes the following step S101.

In step S101, the heat exchange assembly20and the upper end of the gas-liquid separation assembly11included in the gas-liquid separator100are welded to the lower end of the first end cover4, wherein the heat exchange assembly20is located outside the gas-liquid separation assembly11.

Taking the heat exchange assembly20including the aforementioned first collecting pipe2110, the second collecting pipe2111and the flat tube21as an example, welding the heat exchange assembly20to the lower end of the first end cover4can be understood as welding the upper end of the first collecting pipe2110to the lower end of the first end cover4. Specifically, welding is performed at the connection between the first collecting pipe2110and the first through hole410(for example, the position marked by the reference numeral91inFIG.54). The welding can be performed by flame welding. Of course, other welding methods can also be used for welding.

Taking the gas-liquid separation assembly11including the aforementioned gas guide tube111as an example, welding the upper end of the gas-liquid separation assembly11to the lower end of the first end cover4can be understood as welding the upper end of the gas guide tube111to the lower end of the first end cover4. Specifically, welding is performed at the connection between the gas guide tube111and the collecting hole44(for example, the position marked by the reference numeral92inFIG.54). The welding here can also be welded by flame welding. Of course, other welding methods can also be used for welding.

This application does not limit the sequence of welding the heat exchange assembly20and the gas-liquid separation assembly11to the first end cover4, which can be set according to the specific application environment.

It should be noted that the step S101may be performed before the step S103, as shown inFIG.57. Of course, the step S101may also be performed after the step S103.

Taking the step S101before the step S103as an example, when the first cylinder2is set in the step S103, the first cylinder2is located between the gas-liquid separation assembly11and the heat exchange assembly20.

In addition, in the step S105, specifically, the second end cover5is welded to the lower end of the heat exchange assembly20. After the second end cover5is arranged at the opposite end of the first end cover4, and before the second end cover5is welded to the lower end of the heat exchange assembly20, as shown inFIG.54, the manufacturing method also includes applying a pre-tightening force F on the first end cover4and the second end cover5. As a result, it makes the connection of components between the first end cover4and the second end cover5more compact, such as the connection between the first cylinder2and the first end cover4. This can be achieved by clamping tooling.

Taking the heat exchange assembly20including the aforementioned first collecting pipe2110, the second collecting pipe2111and the flat tube21as an example, welding the second end cover5to the lower end of the heat exchange assembly20can be understood as welding the lower end of the first collecting pipe2110to the upper end of the second end cover5. Specifically, welding is performed at the connection between the first collecting pipe2110and the second through hole510. The welding can be performed by flame welding. Of course, other welding methods can also be used for welding.

In addition, in some embodiments, the manufacturing method may also provide a molecular sieve8. Accordingly, before the step S105, the manufacturing method may include a step S104.

In step S104, the molecular sieve8is connected to the gas-liquid separation assembly11so that the molecular sieve8is located in the first cylinder2. Specifically, in some embodiments, the molecular sieve8may be connected to the sleeve112.

It should be noted that the step S104may be performed after the step S103. That is, after installing the first cylinder, the molecular sieve8is installed in the first cylinder and connected to the gas-liquid separation assembly11.

In other embodiments, it can also be performed before the step S101. That is, the molecular sieve8is connected to the gas-liquid separation assembly11in advance, and the molecular sieve8is installed along with the installation of the gas-liquid separation11.

The foregoing descriptions are only preferred embodiments of the preset application, and do not impose any formal restrictions on the present application. Although the present application has been disclosed as above in preferred embodiments, it is not intended to limit the application. Those of ordinary skilled in the art, without departing from the scope of the technical solutions of the present application, can use the technical content disclosed above to make some changes or modifications into equivalent embodiments with equivalent changes. However, without departing from the content of the technical solution of this application, any simple amendments, equivalent changes and modifications made to the above embodiments based on the technical essence of this application still fall within the scope of the technical solution of this application.