Patent Description:
With the adjustment of test requirements of the refrigerator energy efficiency standard and the improvement of the energy efficiency requirements of the refrigerators, capillary throttling is used in the throttling parts of most existing refrigerators. Since the capillary does not have the function of flow regulation, a refrigeration system of the refrigerator cannot operate at the best operating conditions under different environmental conditions, which has a great influence on the energy efficiency.

In the conventional technology, an electronic expansion valve for air conditioning can be applied to the refrigerator to achieve the function of flow regulation. Referring to <FIG> is a schematic sectional view of a conventional electronic expansion valve for air conditioning.

During operation, through an external excitation coil, a motor magnetic rotor <NUM>' is driven to rotate, which drives a valve needle screw <NUM>' to rotate relative to a fixing nut <NUM>', thereby realizing the up and down movement of a valve needle <NUM>' at a valve port <NUM>'. Relative position changes between a tapered end portion of the valve needle <NUM>' and the valve port <NUM>' cause a flow section of this position to change, thereby regulating the flow rate.

In an air conditioning system, the electronic expansion valve adopts closed-loop control, which has a linear flow characteristic. Flow deviation at a certain pulse operating point has a relatively small influence in the system, and is allowed to reach <NUM>%. In addition, a compressor in the air conditioning system does not stop, and when the control temperature balance is reached, the compressor is operated at a very low frequency such as a frequency of <NUM>. Therefore, it is not necessary for the electronic expansion valve used in air conditioning to have a function of full closing.

However, the refrigerating capacity of the refrigerator is small, and accordingly, a flow regulation range is also small. As shown in <FIG>, in a case that the valve port <NUM>' and the tapered valve needle <NUM>' are adopted in the electronic expansion valve to regulate the flow, the flow control precision deviation can reach <NUM>%, far exceeding the flow control precision required by the refrigerator.

In addition, the refrigerator is an intermittent refrigeration device, the compressor is stopped after the temperature balance is reached, and after the compressor is stopped, the refrigeration is stopped, and a refrigerant in a condenser flows into an evaporator, which is not only beneficial for energy saving, but also ensures more accurate temperature control. Therefore, the conventional electronic expansion valve cannot meet requirements on internal leakage of the refrigerator system. Moreover, even if the valve needle <NUM>' can completely close the valve port <NUM>', the valve port <NUM>' and the valve needle <NUM>' are prone to wear, which affects the flow control precision and causes the valve to be easily stuck.

It can be understood that, in addition to the refrigerator, similar problems also exist in other small refrigeration systems. Documents <CIT>, <CIT> and <CIT> disclose a valve device according to the preamble of claim <NUM>.

An object of the present invention is to provide a valve device. The flow deviation of the valve device can be controlled within a small range, thereby meeting the requirements for accurate flow control of refrigerators and similar small refrigerant systems.

Another object of the present invention is to provide a refrigerator refrigerating system having the valve device. The refrigerator refrigerating system which is capable of regulating refrigerant flow according to working conditions, and has small flow deviation, thereby improving the energy efficiency of the system.

In order to solve the above technical problems, a valve device according to the present invention, is provided having the features of claim <NUM>.

According to the valve device provided by the present invention the valve needle structure of the electronic expansion valve for air conditioning in the conventional technology is discarded, and a component for regulating the flow rate is realized by a sliding block structure. The flow channel portion and the blocking portion are arranged in the sliding block along the circumferential direction, wherein the flow channel portion is in communication with the valve chamber, and the inlet of the valve seat component is also in communication with the valve chamber. The sliding block is driven to rotate by the drive component to cause the flow channel portion to communicate with the outlet of the valve seat component, thereby causing the inlet to communicate with the outlet; or the sliding block is driven to rotate by the drive component to cause the blocking portion to close the outlet, thereby cutting off the communication between the inlet and the outlet. Thus, the communication or noncommunication between the inlet and the outlet is realized through the rotation of the sliding block relative to the valve seat component, and the valve device has the function of complete closing, and no stuck failure will occur when the valve device is completely closed. In addition, the flow area of the flow channel portion varies along the circumferential direction. Thus, through the rotation of the sliding block, different portions of the flow channel portion in the sliding block communicate with the outlet of the valve seat, so as to realize the regulation of the flow rate. Since the flow area of the flow channel portion along the circumferential direction is easy to set and regulate, and can be set to a small value according to the system requirements, the flow deviation can be easily controlled to be within a small range such as less than <NUM>% by setting the flow area of the flow channel portion of the sliding block, which can satisfy the flow control accuracy requirements of the refrigerator and similar small refrigeration systems. The valve device according to the present invention, i.e. the subject-matter of claim <NUM>, also includes a filter component, which is configured to filter the refrigerant flowing into the flow channel portion, and includes a sliding block provided with a chamber at a top portion of the sliding block, wherein the filter component is embedded in the chamber and has a predetermined distance from a bottom wall of the chamber, and the flow channel portion is in communication with a receiving chamber formed between the filter component and the chamber.

Based on the valve device described above, some of the technical features can be further defined to form the following new technical solutions:.

In the valve device as described above, the drive component includes a rotor component, wherein the rotor component includes a magnet and a rotating shaft inserted in the magnet, the sliding block is sleeved on the rotating shaft, and the rotor component can drive the sliding block to rotate when the rotor component rotates.

In the valve device as described above, a latching structure is further provided between the magnet and the sliding block.

In the valve device as described above, a protruding key portion is provided at a lower end of the magnet, the sliding block has a key groove engaged with the key portion, and the key portion and the key groove together form the latching structure.

The valve device as described above further includes a casing enclosing the magnet, wherein a bottom of the casing is fixed to the valve seat component, the magnet includes a cylindrical portion and a partition portion, the partition portion separates an inner chamber of the cylindrical portion into an upper chamber and a lower chamber, and the valve chamber is defined by a peripheral wall of the lower chamber, the casing and the valve seat component.

In the valve device as described above, a preloading spring is further provided between the sliding block and the partition portion to bring the sliding block into close contact with a top surface of the valve seat component.

In the valve device as described above, the partition portion has more than one balance hole, and the balance holes communicate the upper chamber with the lower chamber.

In the valve device as described above, the rotating shaft is also inserted in the valve seat component, and the rotating shaft is in a clearance fit with the valve seat component, so that the rotating shaft can rotate relative to the valve seat component.

The valve device as described above further includes a stop component, which is configured to define an initial position of the sliding block relative to the valve seat component.

In the valve device as described above, the stop component includes a first stop portion fixed to the valve seat component and a second stop portion arranged on the drive component, wherein the drive component can drive the second stop portion to rotate synchronously with the sliding block, and the first stop portion and the second stop portion are configured in the following manner:.

the second stop portion is in a state abutting against one side of the first stop portion, and the blocking portion closes the outlet; during the rotation of the second stop portion with the sliding block, one end and another end of the flow channel portion are sequentially in communication with the outlet, and in a rotating direction, in a state where another end of the flow channel portion is in communication with the outlet, the second stop portion abuts against another side of the first stop portion.

In the valve device as described above, the first stop portion is an elastic member.

In the valve device as described above, the flow channel portion includes multiple flow channel orifices with different diameters, and the multiple flow channel orifices are arranged in an arc.

In the valve device as described above, the diameters of the multiple flow channel orifices are sequentially increased in the circumferential direction.

In the valve device as described above, the bottom surface of the sliding block is provided with multiple inner grooves respectively corresponding to positions of the multiple flow channel orifices, and each of the inner grooves is larger than the corresponding flow channel orifice.

In the valve device as described above, the flow channel portion is a continuous section-variable channel having an arc shape.

In the valve device as described above, a support boss for supporting the filter component is provided at a middle position of the bottom of the chamber, wherein the receiving chamber is defined by a bottom wall of the filter component, a side wall and the bottom wall of the chamber and an outer peripheral wall of the support boss.

In the valve device as described above, the filter component is formed by sintering tin-bronze powder or stainless steel powder, or the filter component is made of multi layers of stainless steel mesh.

In the valve device as described above, the number of meshes of the filter component is greater than <NUM> mesh.

In the valve device as described above, the inlet and the outlet are arranged at the bottom of the valve seat component, a valve port communicating with the outlet is provided at a top portion of the valve seat component, and the inlet is in communication with the valve chamber through a flow port arranged in a side portion of the valve seat component.

In the valve device as described above, the valve seat component includes a support seat and a valve seat body fixed on the support seat, wherein the valve port and the flow port are both arranged in the valve seat body.

In the valve device as described above, the support seat has a through hole adapted to the valve seat body, the valve seat body is firmly fit into the through hole, and the inlet and the outlet are both arranged in the valve seat body.

A refrigerator refrigerating system is further provided according to the present invention. The refrigerator refrigerating system includes a compressor, a condenser and an evaporator, wherein an inlet of the condenser is connected to an outlet of the compressor, and an outlet of the evaporator is connected to an inlet of the compressor. The refrigerator refrigerating system further includes a valve device arranged between the condenser and the evaporator, wherein the valve device is the valve device according to claim <NUM>.

In the refrigerator refrigerating system provided by the present invention the valve device is provided between the condenser and the evaporator, and the flow rate of the refrigerant flowing into the evaporator is regulated by the valve device, wherein the valve device is the valve device according to any one of the above. Since the valve device can control the flow deviation to be within a small range and the flow control accuracy is high, the refrigerator refrigerating system provided with the valve device can not only regulate the flow rate of the refrigerant according to the working condition, but also has high regulation accuracy, which can enable the refrigerator to achieve better operating conditions under different environmental conditions and thereby improve the energy efficiency of the system.

The refrigerator refrigerating system as described above further includes a heat exchanger for heating the refrigerant flowing from the evaporator to the compressor.

In the refrigerator refrigerating system as described above, the heat exchanger includes a capillary tube and a gas return tube, wherein the capillary tube is arranged between the valve device and the condenser, one end of the gas return tube is connected to the outlet of the evaporator, another end of the gas return tube is connected to the inlet of the compressor, and the capillary tube is wound around the gas return tube.

The refrigerator refrigerating system as described above further includes a drying filter arranged between the capillary tube and the condenser.

In the refrigerator refrigerating system as described above, a flow area of the capillary tube is not smaller than a maximum flow area of the flow channel portion.

In order to provide those skilled in the art with a better understanding of the solutions of the present invention, the present invention is described hereinafter in further detail in conjunction with the drawings and specific embodiments.

Referring to <FIG> is a schematic sectional view of a specific embodiment of a valve device according to the present invention.

In the present embodiment, the valve device includes a drive component and a valve seat component <NUM>, wherein the valve seat component <NUM> has an inlet <NUM> and an outlet <NUM>, and the inlet <NUM> is in communication with a valve chamber R1 of the valve device.

The valve device further includes a sliding block <NUM> supported by the valve seat component <NUM>, and a bottom surface of the sliding block <NUM> is in contact with a top surface of the valve seat component <NUM>.

The sliding block <NUM> has a flow channel portion and a blocking portion, which are circumferentially sleeved on a rotation center of the sliding block, wherein a flow area of the flow channel portion varies along a circumferential direction, and the flow channel portion is in communication with the valve chamber R1.

The drive component is configured to drive the sliding block <NUM> to rotate relative to the valve seat component <NUM>, so as to cause the flow channel portion to communicate with the outlet <NUM> and thereby communicate the inlet <NUM> with the outlet <NUM>, or to cause the blocking portion to close the outlet <NUM> and thereby cutting off the communication between the inlet <NUM> and the outlet <NUM>.

It can be understood that a distance between the flow channel portion and the rotation center of the sliding block <NUM> should enable the flow channel portion to communicate with the outlet <NUM> when the sliding block <NUM> rotates.

As described above, the valve device discards the valve needle structure of the electronic expansion valve for air conditioning in the conventional technology, and a component for regulating the flow rate is realized by a sliding block structure. The flow channel portion and the blocking portion are arranged in the sliding block <NUM> along the circumferential direction, wherein the flow channel portion is in communication with the valve chamber R1, and the inlet <NUM> of the valve seat component <NUM> is also in communication with the valve chamber R1. The sliding block <NUM> is driven to rotate by the drive component to cause the flow channel portion to communicate with the outlet <NUM> of the valve seat component <NUM>, thereby causing the inlet <NUM> to communicate with the outlet <NUM>; or the sliding block <NUM> is driven to rotate by the drive component to cause the blocking portion to close the outlet <NUM>, thereby cutting off the communication between the inlet <NUM> and the outlet <NUM>. Thus, the communication or noncommunication between the inlet <NUM> and the outlet <NUM> is realized through the rotation of the sliding block <NUM> relative to the valve seat component <NUM>, and the valve device has the function of complete closing, and no stuck failure will occur when the valve device is completely closed.

In addition, the flow area of the flow channel portion varies along the circumferential direction. Thus, through the rotation of the sliding block <NUM>, different portions of the flow channel portion in the sliding block <NUM> communicate with the outlet <NUM>, so as to realize the regulation of the flow rate. Since the flow area of the flow channel portion along the circumferential direction is easy to set and regulate, and can be set to a small value according to the system requirements, the flow deviation can be easily controlled to be within a small range such as less than <NUM>% by setting the flow area of the flow channel portion of the sliding block <NUM>, which can satisfy the flow control accuracy requirements of the refrigerator and similar small refrigeration systems.

Referring to <FIG> together, <FIG> is a schematic structural view of the sliding block shown in <FIG> as viewed from a certain perspective; <FIG> is a schematic structural view of the sliding block shown in <FIG> as viewed from another perspective; <FIG> is a top view of the sliding block shown in <FIG>; and <FIG> is a sectional view taken along the direction A-A in <FIG>.

In the specific embodiment, the flow channel portion of the sliding block <NUM> has multiple flow channel orifices <NUM> with different diameters. Specifically, the multiple flow channel orifices <NUM> are arranged in an arc around the rotation center of the sliding block <NUM>. Thus, a portion at an outer end, between two flow channel orifices <NUM>, forms the blocking portion of the sliding block <NUM>.

In the embodiment shown in <FIG> and <FIG>, the flow channel portion of the sliding block <NUM> is provided with five flow channel orifices <NUM>, and the five flow channel orifices <NUM> sequentially are 31a, 31b, 31c, 31d and 31e in a clockwise direction shown in <FIG>, as viewed from a perspective shown in <FIG>.

In the illustrated embodiment, the diameters of the five flow channel orifices 31a, 31b, 31c, 31d and 31e sequentially increase, and angles between two adjacent flow channel orifices <NUM> are constant, that is, the multiple flow channel orifices <NUM> are uniformly distributed on a circular arc segment. With this design, each time the sliding block <NUM> is rotated by a same angle, the flow rate is regulated once, which facilitates the operation of the valve device.

As described above, the flow channel portion is designed as a structure with multiple flow channel orifices <NUM>, and the number of the flow channel orifices <NUM> and the diameter of each flow channel orifice <NUM> are easy to control, which facilitates the regulation of the flow rate and satisfies the control requirements of the refrigerator and similar small refrigeration systems. In an embodiment, the diameters of the flow channel orifices 31a, 31b, 31c, 31d and 31e are sequentially set to <NUM>, <NUM>, <NUM>, <NUM>, <NUM>.

It can be understood that, in practice, the diameters of the flow channel orifices <NUM> may be irregular when arranged, and in addition, the multiple flow channel orifices <NUM> may be nonuniformly arranged on the circular arc segment. However, the regular and uniform arrangement of the flow channel orifices as shown in the figures makes it easier to control the product.

Further, referring to <FIG>, multiple inner grooves <NUM> are provided on the bottom surface of the sliding block <NUM>, which correspond to positions of the multiple flow channel orifices <NUM>, respectively. Moreover, each of the inner grooves <NUM> is larger than the corresponding flow channel orifice <NUM>.

With the above design, when the sliding block <NUM> rotates relative to the valve seat component <NUM>, end portions of the flow channel orifices <NUM> are prevented from directly rubbing against the valve seat component <NUM>, which prevents the blocking of the flow channel orifices <NUM> caused by rotation wear between the bottom surface of the sliding block <NUM> and the top surface of the valve seat component <NUM> and ensures the reliability of the flow control of the product.

Specifically, for ease of machining, dimensions of the inner grooves <NUM> may be unified. In the embodiment shown in <FIG>, each inner groove <NUM> has a counterbore structure with a uniform diameter. It should be understood that the shape of the inner groove <NUM> is unrestricted, as long as the end portions of the flow channel orifices <NUM> can be prevented from directly rubbing against the valve seat component <NUM>.

Referring to <FIG> together, <FIG> is a top view of the sliding block fitted with a filter component according to the present invention; and <FIG> is a schematic sectional view taken along the direction B-B in <FIG>.

The valve device is also provided with a filter component <NUM>. The filter component <NUM> is configured to filter the refrigerant flowing through the flow channel orifices <NUM> of the sliding block <NUM> to prevent the flow channel orifices <NUM> from being blocked by foreign matter and prevent the performance of the product from being affected.

The filtering ability of the filter component <NUM> can be determined according to the diameters of the flow channel orifices <NUM> and other use requirements. Taking the specific diameters of the flow channel orifices <NUM> as an example, it can be known that the diameter of each flow channel orifice <NUM> is between <NUM> to <NUM>, so in practice, the filter component <NUM> can at least filter out impurities and foreign matter larger than <NUM>. In practice, the number of meshes of the filter component <NUM> may be greater than <NUM> mesh to meet the basic use requirements.

Specifically, the filter component <NUM> may be formed by sintering tin-bronze powder or stainless steel powder, or may be made of multi layers of stainless steel mesh.

It is apparent that, with a flow direction of the refrigerant as a reference, the filter component <NUM> should be arranged at an upstream position of the flow channel orifices <NUM> of the sliding block <NUM>.

According to the present invention, the top portion of the sliding block <NUM> is provided with a chamber <NUM>, wherein the filter component <NUM> is embedded in the chamber <NUM> and has a predetermined distance from a bottom wall of the chamber <NUM>, such that a receiving chamber R2 is formed between the filter component <NUM> and the chamber <NUM>, the filtered refrigerant flows into the flow channel orifices <NUM> through the receiving chamber R2, apparently, and each flow channel orifice <NUM> is in communication with the receiving chamber R2.

The predetermined distance between the filter component <NUM> and the bottom wall of the chamber <NUM> can be set as needed.

More specifically, a support boss <NUM> supporting the filter component <NUM> is provided at a middle position of a bottom of the chamber <NUM>. With reference to <FIG> and <FIG>, such arrangement facilitates the positioning of the filter component <NUM> within the chamber <NUM>.

As shown in <FIG>, with such arrangement, the receiving chamber R2 is an annular chamber enclosed by a bottom wall of the filter component <NUM>, a side wall and the bottom wall of the chamber <NUM>, and an outer peripheral wall of the support boss <NUM>.

It should be noted that in the present embodiment, although the filter component <NUM> is embedded in the sliding block <NUM>, the filter component <NUM> may or may not rotate together with the sliding block <NUM>, when the sliding block <NUM> rotates relative to the valve seat component <NUM>, which does not affect the filtering effect of the filter component <NUM>.

The valve seat component provided herein and cooperating with the sliding block is illustrated in <FIG>. <FIG> is a schematic structural view of the valve seat component shown in <FIG>; <FIG> is a top view of the valve seat component shown in <FIG>; and <FIG> is a schematic sectional view taken along the direction C-C in <FIG>.

In the present embodiment, an inlet <NUM> and an outlet <NUM> are provided at a bottom of the valve seat component <NUM>, and are connected with an inlet pipe <NUM> and an outlet pipe <NUM>, respectively.

A valve port <NUM> communicating with the outlet <NUM> is provided at a top portion of the valve seat component <NUM>, a flow port <NUM> communicating with the inlet <NUM> is provided in a side portion of the valve seat component <NUM>, and the flow port <NUM> is in communication with the valve chamber R1.

It can be understood that the inlet <NUM> is not in direct communication with the flow channel orifices <NUM> of the sliding block <NUM>.

It should be understood that when the valve seat component <NUM> is arranged as above, the position of the flow channel orifice <NUM> of the sliding block <NUM> corresponds to the position of the valve port <NUM>, such that during the rotation of the sliding block <NUM>, the flow channel orifice <NUM> can communicate with the valve port <NUM> and then communicate with the outlet <NUM>.

Thus, the refrigerant flows in from the inlet pipe <NUM>, then flows into the valve chamber R1 through the inlet <NUM> and the flow port <NUM> of the valve seat component <NUM>, then flows into the flow channel orifice <NUM> through the filter component <NUM>, and flows out of the outlet pipe <NUM> through the valve port <NUM> and the outlet <NUM>.

In an embodiment, the valve seat component <NUM> includes a support seat <NUM> and a valve seat body <NUM> fixed thereto. The two are separately arranged and can be fixed by welding, which is simple and reliable.

Both the valve port <NUM> and the flow port <NUM> are provided on the valve seat body <NUM>, that is, the sliding block <NUM> directly abuts against the valve seat body <NUM> and rotates relative to the valve seat body <NUM>.

Specifically, both the inlet <NUM> and the outlet <NUM> may be arranged on the valve seat body <NUM>, a through hole adapted to the valve seat body <NUM> is arranged on the support seat <NUM>, and the valve seat body <NUM> is firmly fit into the through hole of the support seat <NUM>.

Both the inlet <NUM> and the outlet <NUM> may be arranged on the support seat <NUM>, the valve seat body <NUM> is fixed to a top surface of the support seat <NUM>, and the valve port <NUM> and the flow port <NUM> correspond to positions of the outlet <NUM> and the inlet <NUM>, respectively.

One portion of the inlet <NUM> and the outlet <NUM> may be partially arranged on the valve seat body <NUM>, and another portion may be arranged on the support seat <NUM>.

In addition, the valve seat component <NUM> may have an integrated structure. However, a split structure is relatively easy to process and reduces the cost.

Referring to <FIG> together, <FIG> is a schematic structural view of a rotor component shown in <FIG>; and
<FIG> is a schematic sectional view of the rotor component shown in <FIG>.

In the present embodiment, the drive component that drives the sliding block <NUM> to rotate is a motor, and the motor specifically includes a rotor component <NUM> and a coil component.

The rotor component <NUM> includes a magnet <NUM> and a rotating shaft <NUM> inserted in the magnet <NUM>, and a lower end of the rotating shaft <NUM> is sequentially inserted into the filter component <NUM> and the sliding block <NUM>. During operation, the rotor component <NUM> is driven to rotate by the external coil component, thereby driving the sliding block <NUM> to rotate relative to the valve seat body <NUM>.

In order to enable the rotor component <NUM> to drive the sliding block <NUM> to rotate together when the rotor component <NUM> rotates, the sliding block <NUM> may be fixed relative to the rotating shaft <NUM>, for example, the sliding block <NUM> is in an interference fit with the rotating shaft <NUM>.

The sliding block <NUM> may be fixed relative to the magnet <NUM>. In the present embodiment, a latching structure is provided between the magnet <NUM> and the sliding block <NUM>, such that the sliding block <NUM> can rotate together with the magnet <NUM>.

Specifically, a protruding key portion <NUM> is provided at a lower end of the magnet <NUM>, and the sliding block <NUM> is provided with a key groove <NUM> engaged with the key portion <NUM>. The key portion <NUM> is engaged with the key groove <NUM>, such that the sliding block <NUM> is fixed relative to the magnet <NUM>. In addition, the key portion <NUM> of the magnet <NUM> is fitted into the key groove <NUM>, which presses the sliding block <NUM> against the valve seat body <NUM> to a certain extent, and thereby ensures that the sliding block <NUM> abuts against the valve seat body <NUM> and prevents the refrigerant from flowing in from a clearance between the two.

The valve device further includes a casing <NUM> enclosing the magnet <NUM>, and a bottom of the casing <NUM> is fixed to the valve seat component <NUM>. In the present embodiment, the bottom of the casing <NUM> is fixed to the support seat <NUM> of the valve seat component <NUM>.

Specifically, an upward facing stepped surface is provided at a top portion of the support seat <NUM>, so as to facilitate positioning with the casing <NUM>.

In an embodiment, the magnet <NUM> includes a cylindrical portion <NUM> and a partition portion <NUM>, wherein the partition portion <NUM> separates an inner chamber of the cylindrical portion <NUM> into an upper chamber and a lower chamber, such that the rotating shaft <NUM> is inserted in and fixed to the partition portion <NUM>, a top portion of the rotating shaft <NUM> is connected with a bushing <NUM>, and the bushing <NUM> fits with an inner top wall of the casing <NUM>.

The valve chamber R1 is defined by a peripheral wall of the lower chamber of the magnet <NUM>, the casing <NUM> and the valve seat <NUM>, that is to say, in the present embodiment, the lower chamber of the magnet <NUM> is a part of the valve chamber R1, which can shorten an axial dimension of the valve device and facilitate its miniaturization.

In an embodiment, a preloading spring <NUM> is provided between the partition portion <NUM> and the sliding block <NUM> to bring the sliding block <NUM> into close contact with to a top surface of the valve seat body <NUM>.

In the embodiment shown in <FIG>, in a case that the sliding block <NUM> is embedded with the filter component <NUM>, the preloading spring <NUM> actually abuts against the filter component <NUM>.

In an embodiment, more than one balance hole <NUM> is provided on the partition portion <NUM> of the magnet <NUM>. The balance holes <NUM> communicate the upper chamber with the lower chamber to maintain a pressure balance between the upper chamber and the lower chamber of the magnet <NUM> and prevent the magnet <NUM> from playing up and down.

In an embodiment, in order to ensure that the rotation center of the sliding block <NUM> with respect to the valve seat component <NUM> does not change, and to ensure that each flow channel orifice <NUM> can communicate with the outlet <NUM> during the rotation of the sliding block <NUM>, the lower end of the rotating shaft <NUM> is further inserted in the valve seat component <NUM> to ensure the coaxiality of the rotor component <NUM>, the sliding block <NUM> and the valve seat component <NUM>.

Specifically, the valve seat body <NUM> is provided with a shaft hole <NUM> that fits with the rotating shaft <NUM>. The rotating shaft <NUM> is in a clearance fit with the shaft hole <NUM>, so that the rotating shaft <NUM> can rotate relative to the valve seat component <NUM>.

The valve device further includes a stop component. The stop component is configured to define an initial position of the sliding block <NUM> relative to the valve seat component <NUM>, which facilitates the determination of the reference when debugging and exploiting the product.

In an embodiment, the stop component includes a first stop portion <NUM> fixed to the valve seat component <NUM> and a second stop portion <NUM> arranged on the drive component, wherein the drive component can drive the second stop portion <NUM> to rotate synchronously with the sliding block <NUM>, and the first stop portion and the second stop portion are configured in the following manner:.

the second stop portion <NUM> is in a state abutting against one side of the first stop portion <NUM>, and the blocking portion closes the outlet <NUM>; during the rotation of the second stop portion <NUM> with the sliding block <NUM>, the flow channel orifices <NUM> sequentially communicate with the outlet <NUM>, and in a rotating direction, in a state where a last flow channel orifice <NUM> is in communication with the outlet <NUM>, the second stop portion <NUM> abuts against another side of the first stop portion <NUM>.

In an embodiment, the first stop portion <NUM> is an elastic member, such that the second stop portion <NUM> has an elastic cushion when abutting against the first stop portion <NUM>, thereby avoiding inaccurate position configuration caused by wear and tear after long-term operation.

Specifically, the first stop portion <NUM> may be made of rubber and fixed on the support seat <NUM> by a stop pin <NUM>, wherein the top portion of the stop pin <NUM> is provided with a coming-off prevention boss to prevent the first stop portion <NUM> from coming off.

In each of the above embodiments, the structure of the flow channel portion is the multiple flow channel orifices <NUM> distributed in an arc shape. In actual arrangement, the flow channel portion may have other structures such as a continuous section-variable channel in an arc shape, such that a portion where no channel is provided forms the blocking portion for closing the outlet <NUM> in the circumferential direction.

Specifically, one side wall of the section-variable channel may have a circular arc shape, and another side wall may have an Archimedean spiral shape. Apparently, the two side walls of the section-variable channel may both have the Archimedean spiral shape or other forms, as long as the flow area of the channel varies along the circumferential direction.

Referring to <FIG> is a schematic structural view of an embodiment of a refrigerator refrigerating system including a valve device according to the present invention.

In the present embodiment, the refrigerator refrigerating system includes a compressor <NUM>, a condenser <NUM> and an evaporator <NUM>, wherein an inlet of the condenser <NUM> is connected to an outlet of the compressor <NUM>, and an outlet of the evaporator <NUM> is connected to an inlet of the compressor <NUM>.

The refrigerator refrigerating system further includes a valve device <NUM> arranged between the condenser <NUM> and the evaporator <NUM>, wherein the valve device <NUM> is the valve device as described above.

The refrigerator refrigerating system is provided with the valve device <NUM> between the condenser <NUM> and the evaporator <NUM>, and the flow rate of the refrigerant flowing into the evaporator <NUM> is regulated by the valve device <NUM>. The valve device <NUM> is provided with a sliding block structure for regulating the flow rate, and a flow channel portion and a blocking portion are arranged in the sliding block <NUM> in the circumferential direction, wherein the flow channel portion is in communication with the valve chamber R1, and the inlet <NUM> of the valve seat component <NUM> is also in communication with the valve chamber R1. The sliding block <NUM> is driven to rotate by the drive component to cause the flow channel portion to communicate with the outlet <NUM> of the valve seat component <NUM>, thereby causing the inlet <NUM> to communicate with the outlet <NUM>; or the sliding block <NUM> is driven to rotate by the drive component to cause the blocking portion to close the outlet <NUM>, thereby cutting off the communication between the inlet <NUM> and the outlet <NUM>. Thus, the communication or noncommunication between the inlet <NUM> and the outlet <NUM> is realized through the rotation of the sliding block <NUM> relative to the valve seat component <NUM>, and the valve device has the function of complete closing, and no stuck failure will occur when the valve device is completely closed. Thus, when the compressor <NUM> of the refrigerator refrigerating system is shut down, the pressure of the condenser <NUM> can be maintained while reducing energy consumption.

In addition, the flow area of the flow channel portion varies along the circumferential direction. Thus, through the rotation of the sliding block <NUM>, different portions of the flow channel portion in the sliding block <NUM> communicate with the outlet <NUM>, so as to realize the regulation of the flow rate. Since the flow area of the flow channel portion along the circumferential direction is easy to set and regulate, and can be set to a small value according to the system requirements, it is easy to control the flow deviation to be within a small range such as less than <NUM>% by setting the flow area of the flow channel portion of the sliding block <NUM>, and the flow control accuracy is high. Thus, the refrigerator refrigerating system can not only regulate the flow rate of the refrigerant according to the working condition, but also has high regulation accuracy, which can enable the refrigerator to achieve better operating conditions under different environmental conditions and thereby improve the energy efficiency of the system.

The refrigerator refrigerating system further includes a heat exchanger <NUM>. The heat exchanger <NUM> is configured to heat the refrigerant flowing from the evaporator <NUM> to the compressor <NUM>, so as not to cause a liquid impact to the compressor <NUM>.

In an embodiment, the heat exchanger <NUM> includes a capillary tube <NUM> and a gas return tube <NUM>, wherein the capillary tube <NUM> is arranged between the valve device <NUM> and the condenser <NUM>, one end of the gas return tube <NUM> is connected to the outlet of the evaporator <NUM>, another end of the gas return tube <NUM> is connected to the inlet of the compressor <NUM>, and the capillary tube <NUM> is wound around the gas return tube <NUM>, as shown in <FIG>.

The structure design of the heat exchanger <NUM> makes use of a high-temperature refrigerant between the condenser <NUM> and the evaporator <NUM> to heat a low-temperature refrigerant flowing out of the evaporator <NUM>, which can avoid an additional heating source and make the structure of the refrigeration system simpler and more compact.

It should be noted that, with the above structure, although the capillary tube <NUM> is provided between the condenser <NUM> and the evaporator <NUM>, it can be understood that, the capillary tube <NUM> no longer has a substantial throttling function and only functions to exchange heat.

Specifically, in order to facilitate winding the capillary tube <NUM> around the gas return tube <NUM>, a diameter of the capillary tube <NUM> may be set to a slightly smaller value such as <NUM>. It should be understood that, the diameter of the capillary tube <NUM> cannot be set too small, which affects the throttling of the valve device <NUM>. Specifically, the diameter of the capillary tube <NUM> should be set to such a value that the flow area thereof is not smaller than a maximum flow area of the flow channel portion of the valve device <NUM>.

In an embodiment, a drying filter <NUM> is further provided between the condenser <NUM> and the capillary tube <NUM> to filter out the impurities in the refrigerant.

Claim 1:
A valve device, comprising a drive component and a valve seat component (<NUM>), wherein the valve seat component (<NUM>) has an inlet (<NUM>) and an outlet (<NUM>), and the inlet (<NUM>) is in communication with a valve chamber (R1);
the valve device further comprises a sliding block (<NUM>) supported by the valve seat component (<NUM>), and a bottom surface of the sliding block (<NUM>) is in contact with a top surface of the valve seat component (<NUM>);
the sliding block (<NUM>) has a flow channel portion and a blocking portion, the flow channel portion and the blocking portion are circumferentially sleeved on a rotation center of the sliding block (<NUM>), a flow area of the flow channel portion varies along a circumferential direction, and the flow channel portion is in communication with the valve chamber (R1); and
a drive component is configured to drive the sliding block (<NUM>) to rotate with respect to the valve seat component (<NUM>), to cause the flow channel portion to communicate with the outlet (<NUM>) or to cause the blocking portion to close the outlet (<NUM>),
characterised in that,
the valve device further comprises a filter component (<NUM>), which is configured to filter a refrigerant flowing into the flow channel portion; and
the sliding block (<NUM>) is provided with a chamber (<NUM>) at a top portion of the sliding block (<NUM>), the filter component (<NUM>) is embedded in the chamber (<NUM>) and has a predetermined distance from a bottom wall of the chamber (<NUM>), and the flow channel portion is in communication with a receiving chamber (R2) formed between the filter component (<NUM>) and the chamber (<NUM>).