Gas-liquid separator, compressor assembly and air conditioner

Abstract

The present disclosure provides a gas-liquid separator, a compressor assembly and an air conditioner, wherein the gas-liquid separator comprises: a first cylinder, an inlet pipe and an outlet pipe, wherein the inlet pipe can introduce fluid into the first cylinder, and the gas separated in the first cylinder can flow out through the outlet pipe, and the fluid can flow in the first cylinder, wherein the first cylinder comprises a first cylinder section, and within the first cylinder section, the flow area of ​​the first cylinder section gradually decreases along the flow direction of the fluid. According to the present disclosure, when the refrigerant passes through the first cylinder section in the liquid separator, the flow velocity of the gaseous refrigerant can be effectively promoted, while the resistance of the liquid refrigerant is relatively large, and the degree of velocity promotion is less than that of the gaseous refrigerant, which promotes the aggregation and condensation of the tiny liquid refrigerant on the grid deliquidator, thereby improving the gas-liquid separation effect, effectively preventing the pump body from inhaling the liquid refrigerant, and improving the life of the compressor and the air conditioner.

Description

Technical Field

[0001] The present disclosure relates to the technical field of compressors, and in particular to a gas-liquid separator, a compressor assembly and an air conditioner. Background Art

[0002] At present, in order to reduce the cost of air-conditioning systems and save space, air-conditioning systems often use small-sized evaporators and miniaturized compressors and their accessories. In small-sized evaporators, the refrigerant often has low heat exchange efficiency. In this case, the state of the refrigerant sucked from the evaporator by the compressor is a gas-liquid mixture. The liquid storage effect of the traditional liquid distributor structure is not ideal, so that the pump body sucks liquid when working, causing liquid compression, which greatly reduces the service life of the compressor and air-conditioning system. At the same time, during the operation, the vibration of the liquid distributor is much greater than the mechanical vibration of the compressor body, and the vibration noise problem is serious.

[0003] Since the gas-liquid separator of the compressor in the prior art has low separation efficiency and poor separation effect, which causes the compressor to easily inhale liquid refrigerant and seriously affects the life of the compressor and the air conditioner, the present invention studies and designs a gas-liquid separator, a compressor assembly and an air conditioner. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defects of the gas-liquid separator of the compressor in the prior art, such as low separation efficiency and poor separation effect, which causes the compressor to easily inhale liquid refrigerant and seriously affects the life of the compressor and the air conditioner, thereby providing a gas-liquid separator, a compressor assembly and an air conditioner.

[0005] In order to solve the above problems, the present disclosure provides a gas-liquid separator, comprising:

[0006] A first cylinder, an inlet pipe and an outlet pipe, wherein the inlet pipe can introduce fluid into the first cylinder, the gas separated in the first cylinder can flow out through the outlet pipe, the fluid can flow in the first cylinder, the first cylinder includes a first cylinder section, and in the first cylinder section, the flow area of ​​the first cylinder section gradually decreases along the flow direction of the fluid.

[0007] In some embodiments, the inlet pipe is located above the first cylinder, and the outlet pipe extends from the bottom of the first cylinder into the interior of the first cylinder. The fluid introduced from the inlet pipe first enters the lower part of the first cylinder, and the fluid flows from bottom to top in the first cylinder. The lead-out end of the outlet pipe is located at the upper part of the first cylinder and is spaced a preset distance from the upper end of the first cylinder.

[0008] In some embodiments, the cross-sectional area of ​​the first barrel section gradually decreases from bottom to top; and / or the lead-out end of the outlet pipe is its upper end, and the height of the upper end of the outlet pipe is flush with the height of the upper end of the first barrel section.

[0009] In some embodiments, the first cylinder body further includes a second cylinder section, which is connected to the first cylinder section in the axial direction of the first cylinder body, and the flow area of ​​the second cylinder section gradually decreases, remains unchanged, or gradually increases along the flow direction of the fluid.

[0010] In some embodiments, the shape of the first cylinder in the longitudinal section is a curved structure, a herringbone structure, a V-shaped structure, or an X-shaped structure; and / or the cross-sectional shape of the first cylinder is a circle or a polygon.

[0011] In some embodiments, the invention further comprises a second cylinder, the second cylinder is sleeved on the outside of the first cylinder, a first communication channel is provided at the lower part of the first cylinder, and the first communication channel can connect the inside of the first cylinder with the outside;

[0012] The inlet pipe is connected to the interior of the second cylinder, so that the fluid can first flow into the space between the outside of the first cylinder and the inside of the second cylinder, and then enter the interior of the first cylinder through the first communication channel.

[0013] In some embodiments, there is a gap in the radial direction between the upper end of the first cylinder and the inner wall of the second cylinder; the lower end of the first cylinder is connected to the inner wall of the second cylinder; and there is a gap in the radial direction between the outer wall portion between the upper end and the lower end of the first cylinder and the inner wall of the second cylinder.

[0014] In some embodiments, there are a plurality of first communication channels, and the plurality of first communication channels are spaced apart in a circumferential direction around a central axis of the first cylinder.

[0015] In some embodiments, a liquid remover is further provided inside the first cylinder, which can separate and remove the liquid passing through the liquid remover, and the height of the liquid remover is higher than the first connecting channel; and / or, a first bracket is further provided at the lower part of the first cylinder, the first cylinder is assembled on the first bracket, and is fixed to the inner wall of the second cylinder through the first bracket, and a second connecting channel is provided on the first bracket, and the second connecting channel is connected to the first connecting channel.

[0016] In some embodiments, the second cylinder includes an upper cylinder, a main cylinder and a lower cylinder, the upper cylinder is connected to the upper end of the main cylinder, the lower cylinder is connected to the lower end of the main cylinder, the inlet pipe is connected to the upper cylinder and extends into the upper cylinder, the outlet pipe is connected to the lower cylinder and extends into the lower cylinder, and after extending into the lower cylinder, the outlet pipe further extends into the interior of the first cylinder.

[0017] In some embodiments, a refrigerant compensator is provided at the upper end of the first cylinder. When the pressure borne by the refrigerant compensator is less than a preset pressure, the refrigerant compensator is closed so that the fluid can only enter the interior of the first cylinder through the first connecting channel at the lower part of the first cylinder; when the pressure borne by the refrigerant compensator is greater than or equal to the preset pressure, the refrigerant compensator is opened so that the fluid can also directly enter the interior of the first cylinder through the refrigerant compensator.

[0018] In some embodiments, a filter component is provided inside the second cylinder, and the filter component is fixed to the inner wall of the second cylinder through a filter bracket; the refrigerant compensator is fixed to the filter bracket; the filter component is located at the upper end of the refrigerant compensator; the refrigerant compensator is a cover structure.

[0019] The present disclosure also provides a compressor assembly, which includes the gas-liquid separator described in any of the preceding items.

[0020] The present disclosure also provides an air conditioner, which includes the aforementioned compressor assembly.

[0021] The gas-liquid separator, compressor assembly and air conditioner provided by the present disclosure have the following beneficial effects:

[0022] The present invention provides a first cylinder body of the gas-liquid separator to include a first cylinder section, and the internal flow area of ​​the first cylinder section gradually decreases in the direction of fluid flow, so that when the refrigerant passes through the first cylinder section in the liquid separator, the flow velocity of the gaseous refrigerant is effectively promoted to increase, while the liquid refrigerant has a larger resistance and the speed increase degree is less than that of the gaseous refrigerant, which promotes the aggregation and condensation of tiny liquid refrigerant on the grid deliquidator, thereby improving the gas-liquid separation effect, and can effectively prevent the pump body from sucking in liquid refrigerant, thereby increasing the life of the compressor and the air conditioner; and when the refrigerant passes through the first cylinder section (preferably a curved cylinder body) with a gradually decreasing cross-section, the radial stress generated by the pressure difference of the secondary flow of the refrigerant in the liquid separator can be converted into a part of the axial stress (forming a component force), thereby reducing the fluctuation of the radial pressure of the liquid separator when it is unstable during operation, thereby reducing the amplification effect of the liquid separator on the vibration of the compressor, thereby reducing the noise and vibration of the air conditioner during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is an internal cross-sectional structural diagram of the gas-liquid separator disclosed in the present invention;

[0024] Figure 2 for Figure 1 A longitudinal sectional view of the first cylinder;

[0025] Figure 3 for Figure 2 A1-A1 top view of the cross section;

[0026] Figure 4 Schematic diagram of the internal refrigerant flow of the gas-liquid separator disclosed in the present invention.

[0027] The reference numerals are:

[0028] 1. Upper cylinder; 2. Filter component; 3. Lower cylinder; 4. First cylinder; 41. First cylinder section; 42. Second cylinder section; 43. First bracket; 431. Second connecting channel; 44. Refrigerant compensator; 45. First connecting channel; 46. Deliquidator; 5. Outlet pipe; 6. Inlet pipe; 7. Main cylinder; 9. Filter bracket; 10. Second cylinder. DETAILED DESCRIPTION

[0029] like Figure 1-4 As shown, the present disclosure provides a gas-liquid separator, which includes:

[0030] A first cylinder 4, an inlet pipe 6 and an outlet pipe 5, wherein the inlet pipe 6 can introduce fluid into the first cylinder 4, and the gas separated in the first cylinder 4 can flow out through the outlet pipe 5, and the fluid can flow in the first cylinder 4. The first cylinder 4 includes a first cylinder section 41, and in the first cylinder section 41, the flow area of ​​the first cylinder section 41 gradually decreases along the flow direction of the fluid.

[0031] The present invention provides a first cylinder body of the gas-liquid separator to include a first cylinder section, and the internal flow area of ​​the first cylinder section gradually decreases in the direction of fluid flow, so that when the refrigerant passes through the first cylinder section in the liquid separator, the flow velocity of the gaseous refrigerant is effectively promoted to increase, while the liquid refrigerant has a larger resistance and the speed increase degree is less than that of the gaseous refrigerant, which promotes the aggregation and condensation of tiny liquid refrigerant on the grid deliquidator, thereby improving the gas-liquid separation effect, and can effectively prevent the pump body from sucking in liquid refrigerant, thereby increasing the life of the compressor and the air conditioner; and when the refrigerant passes through the first cylinder section (preferably a curved cylinder body) with a gradually decreasing cross-section, the radial stress generated by the pressure difference of the secondary flow of the refrigerant in the liquid separator can be converted into a part of the axial stress (forming a component force), thereby reducing the fluctuation of the radial pressure of the liquid separator when it is unstable during operation, thereby reducing the amplification effect of the liquid separator on the vibration of the compressor, thereby reducing the noise and vibration of the air conditioner during operation.

[0032] 1. Since the cross-sectional area of ​​the contraction section of the curved cylinder is smaller than that of the opening section, the flow rate is higher and the pressure is lower in the area with a smaller cross-sectional area. The pressure difference is expressed as △p,

[0033] 2: According to the Bernoulli equation p+1 / 2(ρv 2 )+ρgh=C, because C is a constant, the pressure change is △p, then △1 / 2(ρv 2 ) can be requested

[0034] 3: The density of the gas-liquid mixed phase refrigerant with insufficient superheat is larger. The density of the gas-liquid mixed state is expressed as ρ1, and the velocity change is expressed as △V1.

[0035] The density of gaseous refrigerant with sufficient superheat is smaller. The density of the gas-liquid mixture is expressed as ρ2, and the velocity change is expressed as △V2.

[0036] Because ρ2<ρ1, then △V2>△V1, so the gas refrigerant with sufficient superheat accelerates more obviously and is easy to be sucked in. The gas-liquid mixture tends to stay at the lower end, and small droplets attached to the grid water storage at the lower end are more likely to gather and condense.

[0037] For conventional vertical compressors, in tests, the vibration of the distributor generally shows that the radial acceleration is several times the axial (longitudinal) acceleration, which shows that the axial stability of the compressor is better. Converting part of the stress into axial stress is beneficial to the vibration and noise reduction of the compressor.

[0038] In some embodiments, the inlet pipe 6 is located above the first cylinder 4, and the outlet pipe 5 extends from the bottom of the first cylinder 4 into the interior of the first cylinder 4, and the fluid introduced from the inlet pipe 6 first enters the lower part of the first cylinder 4 (the lower part here refers to the lower part of the 1 / 2 height of the first cylinder), and the fluid flows from bottom to top in the first cylinder 4. The lead-out end of the outlet pipe 5 is located at the upper part of the first cylinder 4 (the upper part here refers to the upper part of the 1 / 2 height of the first cylinder) and is spaced a preset distance from the upper end of the first cylinder 4. This is the preferred structural form of the present invention, that is, the inlet pipe is located above the first cylinder, the outlet pipe is located below the first cylinder, and the outlet pipe is arranged upward from the lower end of the first cylinder into the interior of the first cylinder, and the upper end of the outlet pipe is located at the upper part of the first cylinder, so that the fluid flows from top to bottom into the lower part of the first cylinder, and then accelerates the gas from bottom to top in the first cylinder, while the liquid fails to accelerate and is separated from the gas and liquid. The liquid is blocked at the deliquidator, which effectively improves the gas-liquid separation effect. At the same time, due to the gradual reduction of the inner cross-section, the radial force will produce a component force and be converted to the axial direction to reduce vibration.

[0039] In some embodiments, the cross-sectional area of ​​the first barrel section 41 gradually decreases from bottom to top; and / or the outlet end of the outlet pipe 5 is the upper end thereof, and the height of the upper end of the outlet pipe 5 is flush with the height of the upper end of the first barrel section 41. The gradual decrease in the cross-sectional area of ​​the first barrel section from bottom to top can accelerate the gas in the process of flowing from bottom to top, so as to enhance the effect of gas-liquid separation; it is further preferred that the upper end of the outlet pipe is flush with the upper end of the first barrel section, so that the gas can be directly discharged from the upper end of the outlet pipe after the effective acceleration and gas-liquid separation are completed in the first barrel section, further enhancing the effect of gas-liquid separation.

[0040] In some embodiments, the first cylinder 4 further includes a second cylinder section 42, which is connected to the first cylinder section 41 in the axial direction of the first cylinder 4, and the flow area of ​​the second cylinder section 42 gradually decreases, remains unchanged, or gradually increases along the flow direction of the fluid. The first cylinder of the present disclosure preferably also includes a second cylinder section, and the gradually decreasing flow area of ​​the second cylinder section can further accelerate the airflow, and the unchanged or reduced flow area can buffer the airflow and prevent excessive flow loss.

[0041] In some embodiments, the shape of the first cylinder 4 in the longitudinal section is a curved structure, or a herringbone structure, or a V-shaped structure, or an X-shaped structure. The curved structure is preferably a hyperbola; and / or the cross-sectional shape of the first cylinder 4 is circular or polygonal. The longitudinal cross-sectional shape of the first cylinder disclosed in the present invention is a curved structure that can form a smooth flow and smooth transition of the airflow, accelerate the gas, separate the liquid, and generate an axial component of the radial force to reduce the vibration of the gas; similarly, the herringbone structure, or the V-shaped structure, or the X-shaped structure can also achieve the effect of improving the separation of gas and liquid, and improve the effect of reducing vibration; the end with the smallest cross-sectional area of ​​the herringbone, V-shaped and X-shaped is the entry end, and the cross-sectional area gradually decreases or first decreases and then increases from the direction of flow from the entry end.

[0042] In some embodiments, a second cylinder 10 is further included, the second cylinder is sleeved on the outside of the first cylinder 4, and a first connecting channel 45 is provided at the lower part of the first cylinder 4, and the first connecting channel 45 can connect the inside of the first cylinder 4 with the outside thereof;

[0043] The inlet pipe 6 is connected to the interior of the second cylinder 10 , so that the fluid can first flow into the space between the outside of the first cylinder 4 and the inside of the second cylinder 10 , and then enter the interior of the first cylinder 4 through the first connecting channel 45 .

[0044] This is a further preferred structural form of the present invention. The second cylinder can be covered on the outside of the first cylinder, so that the inlet pipe can be connected with the second cylinder, first enters the second cylinder from the top, and performs a part of gas-liquid separation in the downward process. In addition, a filter component is arranged at the upper end to play an effective filtering role in the second cylinder, so that the position where the fluid enters the first cylinder with a larger flow rate is the lower end, so that more fluid flows from the bottom to the top in the first cylinder to perform gas-liquid separation, which can further improve the effect of gas-liquid separation and improve the effect of vibration reduction.

[0045] In some embodiments, there is a gap between the upper end of the first cylinder 4 and the inner wall of the second cylinder 10 in the radial direction; the lower end of the first cylinder 4 is connected to the inner wall of the second cylinder 10; there is a gap between the outer wall portion between the upper end and the lower end of the first cylinder 4 and the inner wall of the second cylinder 10 in the radial direction. The gap between the upper portion of the lower end of the first cylinder disclosed in the present invention and the second cylinder forms a channel for fluid flow, so that the fluid flows from top to bottom to the lower end of the first cylinder and enters the first cylinder, while achieving the filtering effect, it also promotes more fluid flow to enter the first connecting channel at the bottom of the first cylinder, thereby improving the gas separation efficiency.

[0046] In some embodiments, there are multiple first communication channels 45, and the multiple first communication channels 45 are arranged at intervals in the circumferential direction around the central axis of the first cylinder 4. The present disclosure can also increase the flow area of ​​the fluid by setting the multiple first communication channels and setting around the central axis, further increase the flow rate entering the first cylinder, and improve the effect of gas-liquid separation.

[0047] In some embodiments, a deliquator 46 is further disposed inside the first cylinder 4, which can separate and remove the liquid passing through the deliquator 46, and the height of the deliquator 46 is higher than the first connecting channel 45; the deliquator 46 is preferably a grid deliquator. And / or,

[0048] A first bracket 43 is also provided at the lower part of the first cylinder 4. The first cylinder 4 is assembled on the first bracket 43 and fixed to the inner wall of the second cylinder 10 through the first bracket 43. A second connecting channel 431 penetrating the inner and outer walls is provided on the first bracket 43. The second connecting channel 431 is connected to the first connecting channel 45.

[0049] The present disclosure also uses a liquid remover disposed inside the first cylinder to block the liquid separated from the gas-liquid on the liquid remover and separate it. The height of the liquid remover is higher than the first connecting channel, which can effectively ensure that the liquid is removed after entering the first connecting channel, preventing blocking before gas-liquid separation, and further improving the gas-liquid separation effect. The present disclosure also uses the first bracket to fix the lower part of the first cylinder to the second cylinder, and the second connecting channel disposed on the first bracket can introduce the fluid in the second cylinder and enter the first cylinder through the first connecting channel.

[0050] In some embodiments, the second cylinder 10 includes an upper cylinder 1, a main cylinder 7 and a lower cylinder 3, wherein the upper cylinder 1 is connected to the upper end of the main cylinder 7, the lower cylinder 3 is connected to the lower end of the main cylinder 7, the inlet pipe 6 is connected to the upper cylinder 1 and extends into the upper cylinder 1, the outlet pipe 5 is connected to the lower cylinder 3 and extends into the lower cylinder 3, and after extending into the lower cylinder 3, the outlet pipe 5 further extends into the interior of the first cylinder 4. This is the preferred structural form of the second cylinder disclosed in the present invention, that is, it includes three parts of the upper cylinder 1, the main cylinder 7 and the lower cylinder 3, the upper cylinder is used to install the inlet pipe, the lower cylinder is used to install the outlet pipe, and the outlet pipe is inserted into the first cylinder to effectively guide the separated gas out.

[0051] In some embodiments, a refrigerant compensator 44 is provided at the upper end of the first cylinder 4. When the pressure borne by the refrigerant compensator 44 is less than a preset pressure, the refrigerant compensator 44 is closed, so that the fluid can only enter the interior of the first cylinder 4 through the first connecting channel 45 at the lower part of the first cylinder 4; when the pressure borne by the refrigerant compensator 44 is greater than or equal to the preset pressure, the refrigerant compensator 44 is opened, so that the fluid can also directly enter the interior of the first cylinder 4 through the refrigerant compensator 44. The present invention discloses a refrigerant compensator disposed at the upper end of the first cylinder, which can selectively open the refrigerant compensator according to the pressure of the fluid, so as to control whether the refrigerant compensator directly supplies fluid to the first cylinder according to the pressure; when the fluid pressure is relatively low, the refrigerant compensator is closed, and the fluid enters the lower part of the first cylinder through the channel between the first cylinder and the second cylinder and flows upward to separate the gas and liquid; when the fluid pressure is too high, the above-mentioned flow will cause the flow speed to be too slow, resulting in a large pressure resistance and pressure loss, which is not conducive to the normal flow of the refrigerant. At this time, the refrigerant compensator should be opened to introduce the fluid flowing into the inlet pipe directly into the first cylinder through the refrigerant compensator, so as to complete the rapid gas-liquid separation of the fluid, reduce the pressure loss, and improve the energy efficiency of the compressor.

[0052] In some embodiments, a filter component 2 is disposed inside the second cylinder 10, and the filter component 2 is fixed to the inner wall of the second cylinder 10 through a filter bracket 9; the refrigerant compensator 44 is fixed to the filter bracket 9; the filter component 2 is located at the upper end of the refrigerant compensator 44; the refrigerant compensator 44 is a cover structure. The present disclosure also enables the refrigerant to be filtered first when entering the second cylinder through the inlet pipe, and then flow downward to the first connecting channel at the bottom of the first cylinder, thereby improving the purity of the refrigerant and ensuring that the fluid enters the first cylinder through the first connecting channel as much as possible; the filter bracket can fix the filter component, and the filter bracket can also fix the refrigerant compensator.

[0053] The present disclosure also provides a compressor assembly, which includes the gas-liquid separator described in any of the preceding items.

[0054] The structure disclosed in the present invention is as follows: the outer layer of the liquid storage device (gas-liquid separator) is composed of an upper cylinder, a lower cylinder, an outer cylinder, a liquid separator suction pipe (inlet pipe), and a liquid separator outlet pipe (outlet pipe). The upper part of the interior is an upper filtering device, which is composed of a filter screen (filter component 2) and a filter screen bracket. The filter screen bracket is connected to a refrigerant compensator. The refrigerant compensator is assembled with the upper end of the internal curved cylinder. The curved cylinder is a cylinder with a hyperbolic cylinder wall, and the lower end is fixed in the outer cylinder of the liquid separator by an inner cylinder bracket. The inner cylinder bracket has circumferential openings for the circulation of refrigerant, and a grid deliquidator is installed above the openings. The refrigerant compensator on the upper part of the curved inner cylinder is fixed on the upper filtering device. When the compressor is working, the refrigerant is sucked in from the liquid separator suction pipe and passes through the upper filtering device, then passes through the inner and outer cylinder gaps and enters the curved cylinder through the openings on the inner cylinder bracket. The change in flow rate when passing through the curved cylinder is more obvious in the cavity. The tiny liquid refrigerant has greater resistance during the rising process and the speed increase is smaller, which promotes the tiny droplets of refrigerant to gather at the bottom of the liquid reservoir and gather and condense on the grid deliquidator. Finally, the gas is sucked into the compressor pump body through the steel pipe. When the liquid distributor is in extreme working conditions and the storage volume of liquid refrigerant is too large, the refrigerant compensator at the upper end of the curved cylinder opens due to the pressure difference to supplement the refrigerant intake. When the refrigerant flows in the curved cylinder, a part of the radial pressure difference of the secondary flow of the refrigerant is converted into an axial pressure difference. Because the axial vibration of the compressor during operation accounts for a much smaller proportion than the radial vibration, the curved cylinder suppresses the amplification effect of the liquid distributor on the radial vibration of the compressor. At the same time, the structural stability of the curved cylinder wall is higher, which can comprehensively reduce the vibration of the compressor during operation.

[0055] The present disclosure also provides an air conditioner, which includes the aforementioned compressor assembly.

[0056] The above is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present disclosure shall be included in the protection scope of the present disclosure. The above is only a preferred implementation of the present disclosure. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present disclosure, and these improvements and variations should also be regarded as the protection scope of the present disclosure.

Claims

1. A gas-liquid separator, characterized in that: include: A first cylinder (4), an inlet pipe (6) and an outlet pipe (5), wherein the inlet pipe (6) is capable of introducing fluid into the first cylinder (4), the gas separated in the first cylinder (4) is capable of flowing out through the outlet pipe (5), and the fluid is capable of flowing in the first cylinder (4), the first cylinder (4) comprising a first cylinder section (41), and within the first cylinder section (41), a flow area of ​​the first cylinder section (41) gradually decreases along a flow direction of the fluid; It also comprises a second cylinder (10), the second cylinder being sleeved on the outside of the first cylinder (4), the lower part of the first cylinder (4) being provided with a first connecting passage (45), the first connecting passage (45) being capable of connecting the inside of the first cylinder (4) with the outside thereof; The inlet pipe (6) is connected to the interior of the second cylinder (10), so that the fluid can first flow into the space between the outside of the first cylinder (4) and the inside of the second cylinder (10), and then enter the interior of the first cylinder (4) through the first connecting channel (45).

2. The gas-liquid separator according to claim 1, characterized in that: The inlet pipe (6) is located above the first cylinder (4), and the outlet pipe (5) extends from the bottom of the first cylinder (4) into the interior of the first cylinder (4). The fluid introduced from the inlet pipe (6) first enters the lower part of the first cylinder (4), and the fluid flows from the bottom to the top in the first cylinder (4). The lead-out end of the outlet pipe (5) is located at the upper part of the first cylinder (4) and is spaced a preset distance from the upper end of the first cylinder (4).

3. The gas-liquid separator according to claim 2, characterized in that: From bottom to top, the cross-sectional area of ​​the first barrel section (41) gradually decreases; and / or the lead-out end of the outlet pipe (5) is its upper end, and the height of the upper end of the outlet pipe (5) is flush with the height of the upper end of the first barrel section (41).

4. The gas-liquid separator according to any one of claims 1 to 3, characterized in that: The first cylinder (4) further comprises a second cylinder section (42), wherein the second cylinder section (42) is connected to the first cylinder section (41) in the axial direction of the first cylinder (4), and the flow area of ​​the second cylinder section (42) gradually decreases, remains unchanged, or gradually increases along the flow direction of the fluid.

5. The gas-liquid separator according to any one of claims 1 to 3, characterized in that: The shape of the first cylinder (4) in the longitudinal section is a curved structure, a herringbone structure, a V-shaped structure, or an X-shaped structure; and / or the cross-sectional shape of the first cylinder (4) is a circle or a polygon.

6. The gas-liquid separator according to claim 1, characterized in that: There is a gap between the upper end of the first cylinder (4) and the inner wall of the second cylinder (10) in the radial direction; the lower end of the first cylinder (4) is connected to the inner wall of the second cylinder (10); and there is a gap between the outer wall portion between the upper end and the lower end of the first cylinder (4) and the inner wall of the second cylinder (10) in the radial direction.

7. The gas-liquid separator according to claim 1, characterized in that: There are a plurality of first communication channels (45), and the plurality of first communication channels (45) are arranged at intervals in a circumferential direction around the central axis of the first cylinder (4).

8. The gas-liquid separator according to claim 1, characterized in that: A liquid remover (46) is further provided inside the first cylinder (4) and is capable of separating and removing liquid passing through the liquid remover (46), and the height of the liquid remover (46) is higher than that of the first connecting channel (45); and / or, A first bracket (43) is further provided at the lower part of the first cylinder (4); the first cylinder (4) is assembled on the first bracket (43) and fixed to the inner wall of the second cylinder (10) via the first bracket (43); a second connecting channel (431) penetrating the inner and outer walls is provided on the first bracket (43); the second connecting channel (431) is connected to the first connecting channel (45).

9. The gas-liquid separator according to claim 1, characterized in that: The second cylinder (10) comprises an upper cylinder (1), a main cylinder (7) and a lower cylinder (3); the upper cylinder (1) is connected to the upper end of the main cylinder (7); the lower cylinder (3) is connected to the lower end of the main cylinder (7); the inlet pipe (6) is connected to the upper cylinder (1) and extends into the upper cylinder (1); the outlet pipe (5) is connected to the lower cylinder (3) and extends into the lower cylinder (3); after extending into the lower cylinder (3), the outlet pipe (5) further extends into the interior of the first cylinder (4).

10. The gas-liquid separator according to claim 1, characterized in that: A refrigerant compensator (44) is provided at the upper end of the first cylinder (4). When the pressure borne by the refrigerant compensator (44) is less than a preset pressure, the refrigerant compensator (44) is closed, so that the fluid can only enter the interior of the first cylinder (4) through the first connecting channel (45) at the lower part of the first cylinder (4); when the pressure borne by the refrigerant compensator (44) is greater than or equal to the preset pressure, the refrigerant compensator (44) is opened, so that the fluid can also directly enter the interior of the first cylinder (4) through the refrigerant compensator (44).

11. The gas-liquid separator according to claim 10, characterized in that: A filter component (2) is provided inside the second cylinder (10), and the filter component (2) is fixed to the inner wall of the second cylinder (10) via a filter bracket (9); the refrigerant compensator (44) is fixed to the filter bracket (9); the filter component (2) is located at the upper end of the refrigerant compensator (44); and the refrigerant compensator (44) is a cover structure.

12. A compressor assembly, characterized in that: A gas-liquid separator comprising the gas-liquid separator according to any one of claims 1 to 11.

13. An air conditioner, characterized in that: Includes the compressor assembly of claim 12.

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