Patent Description:
Currently, in the structure of a compressor, a cavity is formed in the enclosed shell of the compressor, the cavity is divided into an oil cavity and a motor cavity by a compression assembly in the compressor, and generally, the circulation of a lubricating oil between the oil cavity and the motor cavity is achieved by disposing an oil return channel in the compression assembly. However, along with the change of the working conditions of the operation of the compressor, the oil level of the lubricating oil on the bottom of the enclosed shell fluctuates greatly, especially in the process that the lubricating oil in the motor cavity is pressurized to the oil cavity under the effect of pressure difference, the lowering of the oil level in the motor cavity may cause the entrance of a part of a refrigerant into the oil cavity through the oil return channel along with the lubricating oil, and this renders a low recovery efficiency of the lubricating oil and great fluctuation of the oil level of the oil cavity, and further renders increased oil circulation ratio. <CIT>, <CIT> and <CIT> each disclose a compressor having an oil return channel.

In the following, each of the described methods, apparatuses, embodiments, examples, and aspects, which do not fully correspond to the invention as defined in the claims is thus not according to the invention and is, as well as the whole following description, present for illustration purposes only or to highlight specific aspects or features of the claims. Embodiments not falling under the scope of the claims should be interpreted as examples useful for understanding the invention. The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

To this end, a first aspect of the present invention provides a compressor.

A second aspect of the present invention provides a refrigeration device.

In view of this, according to the first aspect of the present invention, a compressor is provided, wherein the compressor comprises a shell, a compression assembly, a motor, an oil sump and an oil return channel. Wherein, the shell constructs a cavity, one part of the compression assembly is fixedly connected with the shell and located in the cavity, and the cavity is divided into a first cavity and a second cavity by the compression assembly. One part of the motor is arranged in the first cavity, the oil sump is arranged in the second cavity, the oil return channel is arranged in the compression assembly, and is configured to communicate the first cavity and the second cavity. The part of the shell located below a central axis of the motor is a first shell. The oil return channel is provided with an oil inlet facing the first cavity, and the oil inlet has a dividing line parallel to a horizontal plane where the central axis of the motor is located. The oil inlet is divided into two areas by the dividing line, the dividing line has two sides, i.e., a side close to the central axis of the motor and a side departing from the central axis of the motor, and an oil through area is located at the side of the dividing line departing from the central axis of the motor. Wherein, a distance between the dividing line and a inner-side wall of the first shell is a first relative distance, the first relative distance is greater than Omm and less than or equal to <NUM>% of a inner diameter of the shell, and an area of the oil through area is greater than or equal to <NUM>% of an area of the oil inlet and less than or equal to the area of the oil inlet.

The compressor provided by the present application comprises a shell, a compression assembly, a motor, an oil sump and an oil return channel, wherein, the shell is a sealed shell, and a part of the compression assembly is fixedly connected with the shell, specifically, the part of the compression assembly can be fixedly connected with the shell through a welding method, thereby ensuring a reliable connecting performance between the compression assembly and the shell. The compression assembly is arranged in the cavity and divides the cavity into a first cavity and a second cavity, the first cavity is located at the left side of the compression assembly, and the second cavity is located at the right side of the compression assembly, wherein a part of the motor is located in the first cavity, the oil sump is disposed in the second cavity, and a lubricating oil is stored in the oil sump. When the compressor operates, the compression assembly can compress a refrigerant, and a portion of compressed refrigerant air can be exhausted through an exhaust structure provided on the shell, and the other portion of the compressed refrigerant air can enter the first cavity and cool the motor, and then, the refrigerant can enter the second cavity and is exhausted through the exhaust structure. According to the present application, through disposing the oil return channel in the compression assembly, the lubricating oil in the oil sump can communicate through the oil return channel. When the refrigerant enters the first cavity, the pressure in the first cavity rises, and under the effect of the pressure, the lubricating oil in the first cavity can enter the second cavity through the oil return channel. This design has a simple and reasonable structure and can improve the recovery efficiency of the lubricating oil, so that the fluctuation of the oil level in the oil sump is relatively stable, and the oil circulation ratio of the compressor is further lowered, so that the oil sump can provide a sufficient volume of oil for the compressor, thereby further improving the reliability and the energy efficiency grade of the compressor. No matter what the working conditions of the compressor are, the oil in the cavity of the motor can return to the oil cavity through the oil return channel in the compression assembly, the oil supply from the oil sump to the compression assembly is ensured, and the reliability of the oil stored in the oil cavity is ensured, and therefore, the oil circulation ratio is decreased, and the performance of the compressor is improved.

In addition, the lubricating oil in the oil channel can also enter the interior of the compression assembly to lubricate the compression assembly, and thus the operation of the compressor can be smoother. Specifically, the compressor is a horizontal compressor.

Further, the shell is divided into a first shell and a second shell connected with the first shell, and both the first shell and the second shell extend along the central axis of the motor. When the shell is in a cylindrical shape, both the first shell and the second shell are partial arc segments. Wherein, the first shell is located under the central axis of the motor. When the horizontal compressor is arranged horizontally on the ground, the outer-side wall of the first shell contacts the ground. Wherein, the oil return channel has an oil inlet facing the first cavity and an oil outlet facing the second cavity, and the lubricating oil in the first cavity enters the oil return channel through the oil inlet and is discharged to the oil sump through the oil outlet. In the working process of the compressor, the overall pressure in the first cavity is higher than the pressure in the second cavity, and under the effect of a pressure difference, the lubricating oil in the first cavity can be pressurized into the second cavity through the oil return channel. However, when the compressor is in a working condition of a high rotation speed or a low-pressure ratio, the large flow volume in the compressor and the large pressure difference between the two sides of the compression assembly may easily render the circumstance that the oil level in the first cavity is lower than the oil inlet of the oil return channel. At this moment, under the effect of the pressure difference, the refrigerant can also enter the second cavity through the oil return channel, and form lots of bubbles in the lubricating oil in the oil sump, which results in a violent fluctuation of the oil level in the oil sump, and further renders the increasing of oil circulation ratio of the compressor, so that the performance of the compressor is lowered.

Through lots of experiments and observations, it is found that it is difficult to expose the oil inlet of the oil return channel in the refrigerant when the first relative distance and the inner diameter of the shell meet the abovementioned relation, and this can effectively improve the ventilation condition in the oil sump, and then lower the oil circulation ratio. Further, the area of the oil through area is greater than or equal to <NUM>% of the area of the oil inlet and less than or equal to the area of the oil inlet, and this can further ensure that the lubricating oil flows from the oil inlet to the oil sump.

When the area of the oil through area is equal to the area of the oil inlet, the dividing line is located at the highest point of the oil inlet (the highest point refers to the highest point in the oil inlet close to the horizontal plane where the central axis of the motor is located). When the area of the oil through area is less than the area of the oil inlet and greater than or equal to <NUM>% of the area of the oil inlet, the dividing line can divide the oil inlet into two areas, wherein one is an oil through area located on the side of the dividing line departing from the central axis of the motor, and the lubricating oil can enter the oil sump through the oil through area.

Further, through lots of experiments and observations, it is found that the distance between the dividing line and the inner-side wall of the first shell is a first relative distance H1, and the oil circulation rate in high frequency (bad) working conditions can be greatly improved when the first relative distance H1 satisfies <NUM><H1≤<NUM>. The ventilation condition of the oil sump can be effectively improved if it is difficult to expose the oil inlet of the oil return channel in the refrigerant, thereby reducing the oil circulation ratio.

It should be explained that, when the dividing line is not located above the first shell, the distance between the dividing line and the inner-side wall of the first shell is the distance between the dividing line and the plane where the inner-side wall of the first shell is located.

Specifically, the oil return channel is located under the horizontal plane where the central axis of the motor is located, the lubricating oil is deposited on the bottom of the cavity under the effect of gravity, and the oil return channel located in the bottom can help the flow of the lubricating oil.

Further, the oil return channel presents a flaring shape in the direction of the central axis of the motor, and then, the area of the oil outlet is greater than the area of the oil inlet. The oil return channel can also have equivalent cross sections in the direction of the central axis of the motor, and a good oil circulation rate can be achieved as long as the distance between the oil inlet of the oil return channel and the first shell satisfies the abovementioned relation.

In a possible design, further, the first relative distance is greater than Omm and less than or equal to <NUM>.

In the above design, the highest point of the oil inlet in the oil return channel can be further lowered if the first relative distance H1 satisfies <NUM><H1≤<NUM>, so that it is more difficult to expose the oil inlet in the refrigerant, thereby effectively improving the ventilation condition of the oil sump, and further reducing the oil circulation ratio.

In a possible design, further, the oil inlet has an apex away from the horizontal plane where the central axis of the motor is located, a distance between the apex and the inner-side wall of the first shell is a second relative distance, and the second relative distance is greater than or equal to Omm and less than or equal to <NUM>.

In the above design, the oil inlet has an apex away from the horizontal plane where the central axis of the motor is located, the distance between the apex and the inner-side wall of the first shell is a second relative distance. When the oil inlet is a closed opening, the second relative distance H2 is greater than Omm and less than or equal to <NUM>, that is, the inner-side wall of the compression assembly which constitutes the oil inlet and the outer-side wall of the compression assembly are independent from each other, and they do not have any connection relation. When the oil inlet is a non-closed opening, the second relative distance H2 is equal to <NUM>, and at this moment, the outer-side wall of the compression assembly is connected with the inner-side wall of the compression assembly which constitutes the oil inlet. Based on the conditions that the dividing line and the inner-side wall of the first shell satisfy <NUM><H1≤<NUM> and the distance between the upper apex of the oil inlet and the inner-side wall of the first shell satisfies <NUM><H2≤<NUM>, the dividing line on the oil inlet and the apex (the lowest point in a gravity direction) on the oil inlet are restricted, and therefore, in a precondition of ensuring the flow effect of the lubricating oil, so that the ventilation condition of the oil sump can be effectively improved if it is difficult to expose the oil inlet of the oil return channel in the refrigerant, and the oil circulation ratio is further reduced.

In a possible design, further, a part of the compression assembly is concaved towards a direction close to the central axis of the motor, so as to form the oil return channel.

In the above design, a part of the compression assembly is concaved towards a direction close to the central axis of the motor, so as to form the oil return channel, i.e., the oil return channel has an oil inlet and an oil outlet along the axis of the motor. Meanwhile, the oil return channel also has an opening facing the shell, and then, since the part of the compression assembly which is provided with the oil return channel is fixedly connected to the shell, the second relative distance H2 between the apex on the oil inlet and the inner-side wall of the first shell is <NUM>. Further, a projection of the oil return channel on the cross section of the crankshaft of the motor is in a circular shape, a triangular shape or a polygonal shape.

In a possible design, further, the motor comprises a crankshaft, a rotor and a stator, wherein a first end of the crankshaft is located in the first cavity, and a second end of the crankshaft is connected with the compression assembly. The rotor is sleeved on the first end of the crankshaft, the stator is sleeved on the outer-side wall of the rotor, and an interval is formed between at least a part of the outer-side wall of the stator and the inner-side wall of the shell. Wherein, a sectional area of the interval on a cross section of the crankshaft is a first sectional area, a sectional area of the oil return channel on a cross section of the crankshaft is a second sectional area, and the second sectional area is less than or equal to <NUM>% of the first sectional area.

In the above design, the first end of the crankshaft is located in the first cavity, and adapted and connected with the rotor and the stator of the motor. The second end of the crankshaft is connected with the compression assembly. The rotor is sleeved on the first end of the crankshaft, and the rotor rotates to drive the crankshaft to move, thereby further achieving the moving of the compression assembly. The stator is sleeved on the outer-side wall of the rotor, and an interval is formed between at least a part of the outer-side wall of the stator and the inner-side wall of the shell, wherein the number of the intervals is at least one. The cross section of the crankshaft is a section which is perpendicular to the axial direction of the crankshaft. The sectional area of the intervals on the cross section of the crankshaft is the first sectional area, while the sectional area of the oil return channel on the cross section of the crankshaft is the second sectional area, the second sectional area is less than or equal to <NUM>% of the first sectional area. When the sectional areas of the oil return channel and the intervals on the cross section of the crankshaft satisfy the above relation, the lubricating oil in the first cavity can flow to the oil return channel through the intervals, thereby ensuring the smooth circulation of the lubricating oil in the first cavity, the oil return channel and the second cavity, and thus the ventilation condition of the oil sump can be improved effectively as it is difficult to expose the oil inlet of the oil return channel in the refrigerant, thereby further reducing the oil circulation ratio.

In a possible design, further, the number of the intervals is at least two, and the first sectional area is a sum of the sectional areas of the at least two intervals, the number of the oil return channels is at least two, and the second sectional area is a sum of the sectional areas of the at least two oil return channels.

In the above design, the number of the intervals is multiple, and the first sectional area is a sum of the sectional areas of a plurality of intervals, the number of the oil return channels is multiple, and the second sectional area is a sum of the sectional areas of a plurality of oil return channels. If the sum of the sectional areas of the multiple intervals and the sum of the sectional areas of the multiple oil return channels satisfy the above relation, it can be ensured that the lubricating oil can circulate smoothly in the first cavity, the oil return channel and the second cavity.

In a possible design, further, the compression assembly comprises an air cylinder and a main bearing, the main bearing is provided at a side of the air cylinder facing the motor, and a part of the motor penetrates the main bearing and connects the air cylinder. Wherein, one of the main bearing and the air cylinder, which is fixedly connected with the shell, is a fastener, and the oil return channel is provided on the fastener.

In the above design, the compression assembly comprises an air cylinder and a main bearing, the main bearing is provided at a side of the air cylinder facing the motor, the second end of the crankshaft penetrates the main bearing and connects the air cylinder. Wherein, the main bearing can be fixedly connected to the inner-side wall of the shell through welding, and the air cylinder can also be fixedly connected to the inner-side wall of the shell through welding, and the fixed connection between the main bearing or the cylinder and the shell can be selected according to actual assembling needs. If the main bearing is welded to the shell, the air cylinder is not fixedly connected with the shell, and at this moment, the oil return channel is disposed on the main bearing, the lubricating oil will enter into the oil return channel through the first cavity, and flow to the oil sump through the gap between the air cylinder and the shell. On the contrary, if the air cylinder is fixedly connected with the shell, the lubricating oil can enter the oil return channel from the first cavity through the gap between the main bearing and the shell, and then enter the oil sump.

In a possible design, further, the compressor further comprises an exhaust pipe and an airflow channel, wherein the exhaust pipe is provided on the shell corresponding to the compression assembly, the airflow channel is provided on the compression assembly, and the airflow channel, the first cavity and the exhaust pipe are communicated with each other.

In the above design, when the compressor works, the compression assembly can pressurize the refrigerant, a portion of the compressed refrigerant air can be exhausted directly through the exhaust pipe, the other portion of the compressed refrigerant air can enter the first cavity through the airflow channel and cool the motor, and then, the refrigerant can enter the second cavity and is exhausted through the exhaust pipe.

In a possible design, further, the compressor further comprises a base and a mounting rack, and the mounting rack is connected to a side of the base facing the shell, and the mounting rack is adapted and connected with the shell.

In the above design, the base can be parallel to the crankshaft, i.e., the shell is disposed on the base horizontally. The base can also be disposed at a certain angle with the crankshaft, i.e., the shell is tilted on the base. When the shell is disposed on the base, the central axis of the motor has a horizontal plane where it is located. When the shell is tilted on the base, the central axis is at a certain angle with respect to the horizontal plane, and then, the base can be tilted fixedly on the horizontal bottom, so that the central axis (crankshaft) of the motor is parallel to the horizontal plane, and then the position relation between the oil inlet in the compression assembly of the compressor and the first shell should also satisfy the above relation.

According to the second aspect of the present invention, a refrigeration device is provided, and the refrigeration device comprises a compressor provided according to the first aspect of the invention.

The refrigeration device provided by the present invention comprises the compressor provided according to the first aspect of the invention, and thus has all the beneficial effects of the compressor, which will not be repeated herein.

Further, the refrigeration device further comprises a housing, a mounting cavity is formed in the housing, the compressor is connected with the housing and located in the mounting cavity, and the compressor, through the protection of the housing, will not be affected by external environment, thereby ensuring the accurate operation of the compressor.

Additional aspects and advantages of the present application will be apparent from the following description, or may be learned by practice of the present application.

Wherein the correspondence between the reference numerals and the component names in <FIG> is:
<NUM> compressor, <NUM> shell, <NUM> first shell, <NUM> cavity, <NUM> first cavity, <NUM> second cavity, <NUM> compression assembly, <NUM> air cylinder, <NUM> main bearing, <NUM> motor, <NUM> crankshaft, <NUM> rotor, <NUM> stator, <NUM> interval, <NUM> oil sump, <NUM> oil return channel, <NUM> oil inlet, <NUM> exhaust pipe, <NUM> airflow channel, <NUM> base, <NUM> mounting rack.

In order that the above objects, features, and advantages of the present application may be more clearly understood, the present application will be described in further detail with reference to the accompanying drawings and preferred embodiments.

In the following description, many specific details are set forth in order to fully understand the present application. However, the present application can also be implemented in other ways different from those described herein.

A compressor <NUM> and a refrigeration device according to some embodiments of the present invention are described below with reference to <FIG>.

According to a first aspect of the present invention, a compressor <NUM> is provided, as shown in <FIG>, and the compressor <NUM> comprises a shell <NUM>, a compression assembly <NUM>, a motor <NUM>, an oil sump <NUM> and an oil return channel <NUM>. Wherein, the shell <NUM> constructs a cavity <NUM>, one part of the compression assembly <NUM> is fixedly connected with the shell <NUM> and located in the cavity <NUM>, and the cavity <NUM> is divided into a first cavity <NUM> and a second cavity <NUM> by the compression assembly <NUM>. One part of the motor <NUM> is arranged in the first cavity <NUM>, the oil sump <NUM> is arranged in the second cavity <NUM>, the oil return channel <NUM> is arranged in the compression assembly <NUM>, and is configured to communicate the first cavity <NUM> and the second cavity <NUM>. The part of the shell <NUM> located below a central axis of the motor <NUM> is a first shell <NUM>, the oil return channel <NUM> is provided with an oil inlet <NUM> facing the first cavity <NUM>, and the oil inlet <NUM> has a dividing line parallel to a horizontal plane where the central axis of the motor <NUM> is located. The oil inlet is divided into two areas by the dividing line, the dividing line has two sides, i.e., a side close to the central axis of the motor <NUM> and a side departing from the central axis of the motor <NUM>, and an oil through area is located at the side of the dividing line departing from the central axis of the motor <NUM>. Wherein, a distance between the dividing line and a inner-side wall of the first shell <NUM> is a first relative distance, the first relative distance is greater than Omm and less than or equal to <NUM>% of a inner diameter of the shell <NUM>, and an area of the oil through area is greater than or equal to <NUM>% of an area of the oil inlet <NUM> and less than or equal to the area of the oil inlet <NUM>.

The compressor <NUM> comprises a shell <NUM>, a compression assembly <NUM>, a motor <NUM>, an oil sump <NUM> and an oil return channel <NUM>, wherein, the shell <NUM> is a sealed shell <NUM>, and a part of the compression assembly <NUM> is fixedly connected with the shell <NUM>. Specifically, a part of the compression assembly <NUM> can be fixedly connected with the shell <NUM> through a welding method, thereby ensuring a reliable connecting performance between the compression assembly <NUM> and the shell <NUM>. The compression assembly <NUM> is arranged in the cavity <NUM> and divides the cavity <NUM> into a first cavity <NUM> and a second cavity <NUM>, the first cavity <NUM> is located at the left side of the compression assembly <NUM>, and the second cavity <NUM> is located at the right side of the compression assembly <NUM>, wherein a part of the motor <NUM> is located in the first cavity <NUM>, the oil sump <NUM> is disposed in the second cavity <NUM>, and a lubricating oil is stored in the oil sump <NUM>. When the compressor <NUM> works, the compression assembly <NUM> can compress a refrigerant, and a portion of compressed refrigerant air can be exhausted through an exhaust structure provided on the shell <NUM>, and the other portion of the compressed refrigerant air can enter the first cavity <NUM> and cool the motor <NUM>, and then, the refrigerant can enter the second cavity <NUM> and is exhausted through the exhaust structure. According to the present invention, through disposing the oil return channel <NUM> in the compression assembly <NUM>, the lubricating oil in the oil sump <NUM> can communicate through the oil return channel <NUM>. When the refrigerant enters the first cavity <NUM>, the pressure in the first cavity <NUM> rises, and under the effect of the pressure, the lubricating oil in the first cavity <NUM> can enter the second cavity <NUM> through the oil return channel <NUM>. This design has a simple and reasonable structure and can improve the recovery efficiency of the lubricating oil, so that the fluctuation of the oil level in the oil sump <NUM> is relatively stable, and the oil circulation ratio of the compressor <NUM> is further lowered, so that the oil sump <NUM> can provide a sufficient volume of oil for the compressor <NUM>, thereby further improving the reliability and the energy efficiency grade of the compressor <NUM>. No matter what the working conditions of the compressor <NUM> are, the oil in the cavity of the motor <NUM> can return to the oil cavity through the oil return channel <NUM> in the compression assembly <NUM>, the oil supply from the oil sump <NUM> to the compression assembly is ensured, and the reliability of the oil stored in the oil cavity is ensured, and therefore, the oil circulation ratio is decreased, and the performance of the compressor <NUM> is improved.

In addition, the lubricating oil in the oil channel <NUM> can also enter the interior of the compression assembly <NUM> to lubricate the compression assembly <NUM>, and thus the operation of the compressor <NUM> can be smoother. Specifically, the compressor <NUM> is a horizontal compressor.

Further, as shown in <FIG>, the shell <NUM> is divided into a first shell <NUM> and a second shell <NUM> connected with the first shell <NUM>, and both the first shell <NUM> and the second shell <NUM> extend along the central axis of the motor <NUM>. When the shell <NUM> is in a cylindrical shape, both the first shell <NUM> and the second shell <NUM> are partial arc segments. Wherein, the first shell <NUM> is located under the central axis of the motor <NUM>. When the horizontal compressor is arranged horizontally on the ground, the outer-side wall of the first shell <NUM> contacts the ground. Wherein, the oil return channel <NUM> has an oil inlet <NUM> facing the first cavity <NUM> and an oil outlet facing the second cavity <NUM>, and the lubricating oil in the first cavity <NUM> enters the oil return channel <NUM> through the oil inlet <NUM> and is discharged to the oil sump <NUM> through the oil outlet. In the working process of the compressor <NUM>, the overall pressure in the first cavity <NUM> is higher than the pressure in the second cavity <NUM>, and under the effect of a pressure difference, the lubricating oil in the first cavity <NUM> can be pressurized into the second cavity <NUM> through the oil return channel <NUM>. However, when the compressor <NUM> is in a working condition of a high rotation speed or a low-pressure ratio, the large flow volume in the compressor <NUM> and the large pressure difference between the two sides of the compression assembly <NUM> may easily render the circumstance that the oil level in the first cavity <NUM> is lower than the oil inlet <NUM> of the oil return channel. At this moment, under the effect of the pressure difference, the refrigerant can also enter the second cavity <NUM> through the oil return channel <NUM>, and form lots of bubbles in the lubricating oil in the oil sump <NUM>, which results in a violent fluctuation of the oil level in the oil sump <NUM>, and further renders the increasing of oil circulation ratio of the compressor <NUM>, so that the performance of the compressor <NUM> is lowered.

As shown in <FIG> and <FIG>, through lots of experiments and observations, it is found that the distance between the dividing line and the inner-side wall of the first shell <NUM> is a first relative distance H1, and the oil circulation rate in high frequency (bad) working conditions can be greatly improved when the first relative distance H1 satisfies <NUM><H1≤<NUM>. The ventilation condition of the oil sump <NUM> can be effectively improved if it is difficult to expose the oil inlet <NUM> of the oil return channel <NUM> in the refrigerant, thereby reducing the oil circulation ratio.

Specifically, as shown in <FIG>, in a simulation experiment, the distance H1 between the dividing line in the oil inlet <NUM> and the inner-side wall of the first shell <NUM> of the compressor <NUM> is set as a variable, and thus three groups of comparative experiments are formed, while the other operating parameters of the compressor <NUM> are the same, and the operating parameters of the compressor <NUM> specifically comprise a suction temperature of -<NUM>, a suction pressure of <NUM>. 38MPa, an exhaust temperature of <NUM>, an exhaust pressure of <NUM>. 53MPa, and a rotating speed of <NUM>. Wherein, when H1=<NUM>, referring to curve C1, it can be seen that the airflow volume (i.e., the air flow of the refrigerant air) in the oil return channel <NUM> presents a regular fluctuation within a certain operating period, that is, at this moment, the refrigerant air exists in the oil return channel <NUM>, which will affect the stability of the oil level of the lubricating oil in the oil sump <NUM>. When the first relative distance H1 is reduced to <NUM>, referring to curve C2, it can be seen that a portion of the refrigerant air exists in the oil return channel <NUM>, however, when the first relative distance H1=<NUM>, at this moment, referring to curve C3, it can be seen that the airflow volume in the oil return channel <NUM> tends to be <NUM>, that is, when the distance between the dividing line of the oil inlet <NUM> of the oil return channel <NUM> and the inner-side wall of the first shell <NUM> satisfies <NUM><H1≤<NUM>, it is difficult to expose the oil inlet <NUM> of the oil return channel <NUM> in the refrigerant, thereby effectively improving the ventilation condition of the oil sump <NUM>, and further reducing the oil circulation ratio, and greatly improving the oil circulation rate in high frequency (bad) working conditions.

Referring to <FIG>, it can be seen that, when the operation frequency of the compressor <NUM> is <NUM>, the distance H1 between the dividing line of the oil inlet <NUM> of the oil return channel <NUM> and the inner-side wall of the first shell <NUM> is reduced, and then the oil circulation rate of the compressor <NUM> can be reduced slightly. When the operation frequency of the compressor <NUM> is <NUM>, and when the H1 is reduced, it can be found that the oil circulation rate of the compressor <NUM> is reduced greatly. When H1=<NUM>, the oil circulation rate of the compressor <NUM> is <NUM>, when H1=<NUM>, the oil circulation rate of the compressor <NUM> is reduced to <NUM>, and therefore, reducing the distance H1 between the dividing line of the oil inlet <NUM> of the oil return channel <NUM> and the inner-side wall of the first shell <NUM> can greatly improve the oil circulation rate of the compressor <NUM> in high frequency (bad) working conditions.

When the first relative distance H1 and the inner diameter of the shell <NUM> satisfy the abovementioned relation, it is difficult to expose the oil inlet <NUM> of the oil return channel <NUM> in the refrigerant, and this can effectively improve the ventilation condition in the oil sump <NUM>, and then lower the oil circulation ratio of the compressor. Further, the area of the oil through area is greater than or equal to <NUM>% of the area of the oil inlet <NUM> and less than or equal to the area of the oil inlet <NUM>, and this can further ensure that the lubricating oil flows from the oil inlet <NUM> to the oil sump <NUM>.

When the area of the oil through area is equal to the area of the oil inlet <NUM>, the dividing line is located at the highest point of the oil inlet <NUM> (the highest point refers to the highest point in the oil inlet <NUM> close to the horizontal plane where the central axis of the motor <NUM> is located). When the area of the oil through area is less than the area of the oil inlet <NUM> and greater than or equal to <NUM>% of the area of the oil inlet <NUM>, the dividing line can divide the oil inlet <NUM> into two areas, wherein one is an oil through area located on the side of the dividing line departing from the central axis of the motor, and the lubricating oil can enter the oil sump <NUM> through the oil through area.

It should be explained that, when the dividing line is not located above the first shell <NUM>, the distance between the dividing line and the inner-side wall of the first shell <NUM> is the distance between the dividing line and the plane where the inner-side wall of the first shell <NUM> is located.

Specifically, the oil return channel <NUM> is located under the horizontal plane where the central axis of the motor <NUM> is located, the lubricating oil is deposited on the bottom of the cavity <NUM> under the effect of gravity, and the oil return channel <NUM> located in the bottom can help the flow of the lubricating oil.

Further, the oil return channel <NUM> presents a flaring shape in the direction of the central axis of the motor <NUM>, and then, the area of the oil outlet is greater than the area of the oil inlet <NUM>. The oil return channel <NUM> can also have equivalent cross sections in the direction of the central axis of the motor <NUM>, and a good oil circulation rate can be achieved as long as the distance between the oil inlet <NUM> of the oil return channel <NUM> and the first shell <NUM> satisfies the abovementioned relation.

Further, the first relative distance is greater than Omm and less than or equal to <NUM>.

In the embodiment, the highest point of the oil inlet <NUM> in the oil return channel <NUM> can be further lowered if the first relative distance H1 satisfies <NUM><H1≤<NUM>, so that it is more difficult to expose the oil inlet <NUM> in the refrigerant, thereby effectively improving the ventilation condition of the oil sump <NUM>, and further reducing the oil circulation ratio.

Further, as shown in <FIG>, the oil inlet <NUM> has an apex away from the horizontal plane where the central axis of the motor <NUM> is located, a distance between the apex and the inner-side wall of the first shell <NUM> is a second relative distance, and the second relative distance is greater than or equal to Omm and less than or equal to <NUM>.

In the embodiment, as shown in <FIG> and <FIG>, the oil inlet <NUM> has an apex away from the horizontal plane where the central axis of the motor <NUM> is located, the distance between the apex and the inner-side wall of the first shell <NUM> is a second relative distance. When the oil inlet <NUM> is a closed opening, as shown in <FIG> and <FIG>, the second relative distance H2 is greater than Omm and less than or equal to <NUM>, that is, the inner-side wall of the compression assembly <NUM> which constitutes the oil inlet <NUM> and the outer-side wall of the compression assembly <NUM> are independent from each other, and they do not have any connection relation. When the oil inlet <NUM> is a non-closed opening, as shown in <FIG> and <FIG>, the second relative distance H2 is equal to <NUM>, and at this moment, the outer-side wall of the compression assembly <NUM> is connected with the inner-side wall of the compression assembly <NUM> which constitutes the oil inlet <NUM>. Based on the conditions that the dividing line and the inner-side wall of the first shell <NUM> satisfy <NUM><H1≤<NUM>, and the distance between the upper apex of the oil inlet <NUM> and the inner-side wall of the first shell <NUM> satisfies <NUM><H2≤<NUM>, the dividing line on the oil inlet <NUM> and the apex (the lowest point in a gravity direction) on the oil inlet <NUM> are restricted, and therefore, in a precondition of ensuring the flow effect of the lubricating oil, so that the ventilation condition of the oil sump <NUM> can be effectively improved as it is difficult to expose the oil inlet <NUM> of the oil return channel <NUM> in the refrigerant, and the oil circulation ratio is further reduced.

Further, a part of the compression assembly <NUM> is concaved towards a direction close to the central axis of the motor <NUM>, so as to form the oil return channel <NUM>.

In the embodiment, a part of the compression assembly <NUM> is concaved towards a direction close to the central axis of the motor <NUM>, so as to form the oil return channel <NUM>, i.e., the oil return channel <NUM> has an oil inlet <NUM> and an oil outlet along the axis of the motor <NUM>. Meanwhile, the oil return channel <NUM> also has an opening facing the shell <NUM>, and then, since the part of the compression assembly <NUM> which is provided with the oil return channel <NUM> is fixedly connected to the shell <NUM>, the second relative distance H2 between the apex on the oil inlet <NUM> and the inner-side wall of the first shell <NUM> is <NUM>. Further, a projection of the oil return channel <NUM> on the cross section of the crankshaft <NUM> of the motor <NUM> is in a circular shape, a triangular shape or a polygonal shape.

What is different from the abovementioned embodiment <NUM> is that the specific structure of the motor <NUM> is described in the present embodiment, wherein the motor <NUM> comprises a crankshaft <NUM>, a rotor <NUM> and a stator <NUM>, wherein a first end of the crankshaft <NUM> is located in the first cavity <NUM>, and a second end of the crankshaft <NUM> is connected with the compression assembly <NUM>. The rotor <NUM> is sleeved on the first end of the crankshaft <NUM>, the stator <NUM> is sleeved on an outer-side wall of the rotor <NUM>, and an interval <NUM> is formed between at least a part of an outer-side wall of the stator <NUM> and the inner-side wall of the shell <NUM>. Wherein, a sectional area of the interval <NUM> on a cross section of the crankshaft <NUM> is a first sectional area, a sectional area of the oil return channel <NUM> on a cross section of the crankshaft <NUM> is a second sectional area, and the second sectional area is less than or equal to <NUM>% of the first sectional area.

In the embodiment, as shown in <FIG>, the first end of the crankshaft <NUM> is located in the first cavity <NUM>, and adapted and connected with the rotor <NUM> and the stator <NUM> of the motor <NUM>. The second end of the crankshaft <NUM> is connected with the compression assembly <NUM>, the rotor <NUM> is sleeved on the first end of the crankshaft <NUM>, and the rotor <NUM> rotates to drive the crankshaft <NUM> to move, thereby further achieving the moving of the compression assembly <NUM>. The stator <NUM> is sleeved on an outer-side wall of the rotor <NUM>, and an interval <NUM> is formed between at least a part of an outer-side wall of the stator <NUM> and the inner-side wall of the shell <NUM>, wherein the number of the intervals <NUM> is at least one. The cross section of the crankshaft <NUM> is a section which is perpendicular to the axial direction of the crankshaft <NUM>. The sectional area of the intervals <NUM> on the cross section of the crankshaft <NUM> is the first sectional area, while the sectional area of the oil return channel <NUM> on the cross section of the crankshaft <NUM> is the second sectional area, the second sectional area is less than or equal to <NUM>% of the first sectional area. When the sectional areas of the oil return channel <NUM> and the intervals <NUM> on the cross section of the crankshaft <NUM> satisfy the above relation, the lubricating oil in the first cavity <NUM> can flow to the oil return channel <NUM> through the intervals <NUM>, thereby ensuring the smooth circulation of the lubricating oil in the first cavity <NUM>, the oil return channel <NUM> and the second cavity <NUM>, and thus the ventilation condition of the oil sump can be improved effectively as it is difficult to expose the oil inlet <NUM> of the oil return channel <NUM> in the refrigerant, thereby further reducing the oil circulation ratio.

Further, the number of the intervals <NUM> is at least two, and the first sectional area is a sum of the sectional areas of the at least two intervals <NUM>, the number of the oil return channels <NUM> is at least two, and the second sectional area is a sum of the sectional areas of the at least two oil return channels <NUM>.

In the embodiment, the number of the intervals <NUM> is multiple, and the first sectional area is a sum of the sectional areas of a plurality of intervals <NUM>, the number of the oil return channels <NUM> is multiple, and the second sectional area is a sum of the sectional areas of a plurality of oil return channels <NUM>. If the sum of the sectional areas of the multiple intervals <NUM> and the sum of the sectional areas of the multiple oil return channels <NUM> satisfy the above relation, it can be ensured that the lubricating oil can circulate smoothly in the first cavity <NUM>, the oil return channel <NUM> and the second cavity <NUM>.

What is different from the abovementioned embodiments is that the specific structure of the compression assembly <NUM> is described in the present embodiment, and further, the compression assembly <NUM> comprises an air cylinder <NUM> and a main bearing <NUM>. The main bearing <NUM> is provided at a side of the air cylinder <NUM> facing the motor <NUM>, and a part of the motor <NUM> penetrates the main bearing <NUM> and connects the air cylinder <NUM>. Wherein, one of the main bearing <NUM> and the air cylinder <NUM>, which is fixedly connected with the shell <NUM>, is a fastener, and the oil return channel <NUM> is provided on the fastener.

In the embodiment, the compression assembly <NUM> comprises an air cylinder <NUM> and a main bearing <NUM>. The main bearing <NUM> is provided at a side of the air cylinder <NUM> facing the motor <NUM>, the second end of the crankshaft <NUM> penetrates the main bearing <NUM> and connects the air cylinder <NUM>. Wherein, the main bearing <NUM> can be fixedly connected to the inner-side wall of the shell <NUM> through welding, and the air cylinder <NUM> can also be fixedly connected to the inner-side wall of the shell <NUM> through welding, and the fixed connection between the main bearing <NUM> or the cylinder <NUM> and the shell <NUM> can be selected according to actual assembling needs. If the main bearing <NUM> is welded to the shell <NUM>, the air cylinder <NUM> is not fixedly connected with the shell <NUM>, and at this moment, the oil return channel <NUM> is disposed on the main bearing <NUM>, the lubricating oil will enter into the oil return channel <NUM> from the first cavity <NUM> through the oil inlet <NUM>, and flow to the oil sump <NUM> through the gap between the air cylinder <NUM> and the shell <NUM>. On the contrary, if the air cylinder <NUM> is fixedly connected with the shell <NUM>, the lubricating oil can enter the oil return channel <NUM> from the first cavity <NUM> through the gap between the main bearing <NUM> and the shell <NUM>, and then enter the oil sump <NUM>.

Further, the compressor <NUM> further comprises an exhaust pipe <NUM> and an airflow channel <NUM>, wherein the exhaust pipe <NUM> is provided on the shell <NUM> corresponding to the compression assembly <NUM>, the airflow channel <NUM> is provided on the compression assembly <NUM>, and the airflow channel <NUM>, the first cavity <NUM> and the exhaust pipe <NUM> are communicated with each other.

In the embodiment, when the compressor <NUM> works, the compression assembly <NUM> can pressurize the refrigerant, a portion of the compressed refrigerant air can be exhausted directly through the exhaust pipe <NUM>, the other portion of the compressed refrigerant air can enter the first cavity <NUM> through the airflow channel <NUM> and cool the motor <NUM>, and then, the refrigerant can enter the second cavity <NUM> and is exhausted through the exhaust pipe <NUM>.

Further, the compressor <NUM> further comprises a base <NUM> and a mounting rack <NUM>, and the mounting rack <NUM> is connected to a side of the base <NUM> facing the shell <NUM>, and the mounting rack <NUM> is adapted and connected with the shell <NUM>.

In the embodiment, the base <NUM> can be parallel to the crankshaft <NUM>, i.e., the shell <NUM> is disposed on the base <NUM> horizontally. The base <NUM> can also be disposed at a certain angle with the crankshaft <NUM>, i.e., the shell <NUM> is tilted on the base <NUM>. When the shell <NUM> is disposed on the base <NUM>, the central axis of the motor <NUM> has a horizontal plane where it is located. When the shell <NUM> is tilted on the base <NUM>, the central axis is at a certain angle with respect to the horizontal plane, and then, the base <NUM> can be tilted fixedly on the horizontal bottom, so that the central axis (crankshaft <NUM>) of the motor <NUM> is parallel to the horizontal plane, and then the position relation between the oil inlet <NUM> in the compression assembly <NUM> of the compressor <NUM> and the first shell <NUM> should also satisfy the above relation.

According to the second aspect of the present invention, a refrigeration device is provided, and the refrigeration device comprises a compressor <NUM> provided according to any one of the above designs.

The refrigeration device provided by the present invention comprises the compressor <NUM> provided according to any one of the above designs, and thus has all the beneficial effects of the compressor, which will not be repeated herein.

Further, the refrigeration device further comprises a housing, a mounting cavity is formed in the housing, the compressor <NUM> is connected with the housing and located in the mounting cavity, and the compressor <NUM>, through the protection of the housing, will not be affected by external environment, thereby ensuring the accurate operation of the compressor <NUM>.

Further, the refrigeration device can be home appliance devices such as a refrigerator and an air conditioner.

In the present application, the term "a plurality of" refers to two or more, unless explicitly defined otherwise. The terms such as "installation", "connected", "connecting", "fixation" and the like shall be understood in broad sense, and for example, "connecting" may be a fixed connection, a detachable connection, or an integral connection; "connected" may be directly connected, or indirectly connected through an intermediary. The specific meaning of the above terms in the present application will be understood by those of ordinary skills in the art, as the case may be.

In the illustration of the description, the illustration of the terms of "one embodiment", "some embodiments", "specific embodiment", etc. means that the specific features, structures, materials, or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example.

In this description, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Claim 1:
A compressor (<NUM>), comprising:
a shell (<NUM>), constructing a cavity (<NUM>);
a compression assembly (<NUM>), wherein one part of the compression assembly (<NUM>) is fixedly connected with the shell (<NUM>) and located in the cavity (<NUM>), and the cavity (<NUM>) is divided into a first cavity (<NUM>) and a second cavity (<NUM>) by the compression assembly (<NUM>);
a motor (<NUM>), wherein one part of the motor (<NUM>) is arranged in the first cavity (<NUM>), and the part of the shell (<NUM>) located below a central axis of the motor (<NUM>) is a first shell (<NUM>); and wherein the motor (<NUM>) comprises:
a crankshaft (<NUM>), wherein a first end of the crankshaft (<NUM>) is located in the first cavity (<NUM>), and a second end of the crankshaft (<NUM>) is connected with the compression assembly (<NUM>);
a rotor (<NUM>), sleeved on the first end of the crankshaft (<NUM>); and
a stator (<NUM>), sleeved on an outer-side wall of the rotor (<NUM>), wherein an interval (<NUM>) is formed between at least a part of an outer-side wall of the stator (<NUM>) and the inner-side wall of the shell (<NUM>),
an oil sump (<NUM>), being arranged in the second cavity (<NUM>); and
an oil return channel (<NUM>), being arranged in the compression assembly (<NUM>), and configured to communicate the first cavity (<NUM>) and the second cavity (<NUM>),
wherein the oil return channel (<NUM>) is provided with an oil inlet (<NUM>) facing the first cavity (<NUM>), and the oil inlet (<NUM>) has a dividing line parallel to a horizontal plane where the central axis of the motor (<NUM>) is located,
a distance between the dividing line and an inner-side wall of the first shell (<NUM>) is a first relative distance,
the oil inlet (<NUM>) comprises an oil through area which is located at one side the dividing line departing from the central axis of the motor (<NUM>), and an area of the oil through area is greater than or equal to <NUM>% of an area of the oil inlet (<NUM>) and less than or equal to the area of the oil inlet (<NUM>),
characterised in that the first relative distance is greater than Omm and less than or equal to <NUM>% of an inner diameter of the shell (<NUM>),
a sectional area of the interval (<NUM>) on a cross section of the crankshaft (<NUM>) is a first sectional area, a sectional area of the oil return channel (<NUM>) on a cross section of the crankshaft (<NUM>) is a second sectional area, and the second sectional area is less than or equal to <NUM>% of the first sectional area.