Compression device and heat exchange system

Abstract

The invention discloses a compression device and a heat exchange system, and relates to the technical field of compression devices.The compression device comprises a compressor, a first liquid storage device, a second liquid storage device and an oil return assembly; the compressor comprises a shell, a first compression assembly and a second compression assembly, the first compression assembly and the second compression assembly are arranged in the shell, the shell is provided with a first exhaust port and a second exhaust port, the exhaust end of the first compression assembly is connected with the first exhaust port through an inner cavity of the shell, and the exhaust end of the second compression assembly is directly connected with the second exhaust port; the first liquid storage device is connected with the air suction end of the first compression assembly, the second liquid storage device is connected with the air suction end of the second compression assembly, the oil return assembly is connected with the first liquid storage device and the second liquid storage device, and when the oil return assembly is conducted, the oil return assembly is used for enabling lubricating oil in the second liquid storage device to flow back to the first liquid storage device; the problem that lubricating oil of the compression device is reduced can be prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of compression devices, and in particular to a compression device and a heat exchange system. Background Art

[0002] In the double-suction double-row compressor in the prior art, when the compressor is exhausted, part of the lubricating oil will be discharged together with the refrigerant, resulting in the problem of insufficient oil return in the compressor. Summary of the invention

[0003] The main purpose of the present invention is to provide a compression device and a heat exchange system, aiming to solve the problem of insufficient oil return from the compressor.

[0004] To achieve the above object, the compression device proposed by the present invention comprises:

[0005] A compressor, comprising a shell, a first compression assembly and a second compression assembly arranged in the shell, the shell having a first exhaust port and a second exhaust port, the exhaust end of the first compression assembly is connected to the first exhaust port through the inner cavity of the shell, and the exhaust end of the second compression assembly is directly connected to the second exhaust port;

[0006] a first liquid reservoir connected to the suction end of the first compression assembly;

[0007] A second liquid reservoir connected to the suction end of the second compression assembly; and

[0008] The oil return assembly connects the first liquid reservoir and the second liquid reservoir, and when the oil return assembly is turned on, it is used to return the lubricating oil in the second liquid reservoir to the first liquid reservoir.

[0009] In one embodiment, the oil return assembly includes a first bypass pipe connecting the first liquid reservoir and the second liquid reservoir, the first bypass pipe having a first end connected to the first liquid reservoir and a second end connected to the second liquid reservoir, the first end is located at the bottom of the inner cavity of the first liquid reservoir, and the second end is located at the bottom of the inner cavity of the second liquid reservoir.

[0010] In one embodiment, the oil return assembly also includes a first valve arranged on the first bypass pipe, the first valve unidirectionally connects the second end to the first end, and when the suction pressure of the first compression assembly is greater than the suction pressure of the second compression assembly, the first bypass pipe is used to return the lubricating oil from the second reservoir to the first reservoir.

[0011] In one embodiment, a throttle valve is further provided on the first bypass pipe, and the throttle valve is used to control the opening size of the first bypass pipe.

[0012] In one embodiment, the oil return assembly further includes a first valve disposed on the first bypass pipe, and the first valve conducts the first end and the second end bidirectionally;

[0013] The first valve is configured to conduct the first bypass pipe when receiving a first control signal indicating that the suction pressure of the second compression assembly is greater than the suction pressure of the first compression assembly, so that the lubricating oil flows back from the second liquid storage tank to the first liquid storage tank under the action of the pressure difference; and to cut off the first bypass pipe when receiving a second control signal indicating that the suction pressure of the second compression assembly is not greater than the suction pressure of the first compression assembly.

[0014] In one embodiment, the first valve is a solenoid valve or a throttle valve.

[0015] In one embodiment, the compression device further includes a gas return assembly, and the gas return assembly connects the first liquid storage tank and the second liquid storage tank;

[0016] The gas return device is configured to conduct the first liquid storage tank and the second liquid storage tank when receiving a third control signal indicating that the discharge pressure of the first compression assembly is greater than the discharge pressure of the second compression assembly and the suction pressure of the first compression assembly is less than the suction pressure of the second compression assembly, so that the refrigerant flows from the first liquid storage tank to the second liquid storage tank under the action of the pressure difference; and / or to conduct the first liquid storage tank and the second liquid storage tank when receiving a fourth control signal indicating that the discharge pressure of the first compression assembly is less than the discharge pressure of the second compression assembly and the suction pressure of the first compression assembly is greater than the suction pressure of the second compression assembly, so that the refrigerant flows from the second liquid storage tank to the first liquid storage tank under the action of the pressure difference.

[0017] In one embodiment, the gas return assembly includes:

[0018] A second bypass pipe connecting the first liquid storage tank and the second liquid storage tank; and

[0019] A second valve disposed on the second bypass pipe for controlling the conduction or cutoff of the second bypass pipe.

[0020] In one embodiment, the second bypass pipe has a third end communicating with the first liquid storage tank and a fourth end communicating with the second liquid storage tank, the third end is above the highest liquid level in the inner cavity of the first liquid storage tank, and the fourth end is above the highest liquid level in the inner cavity of the second liquid storage tank.

[0021] In one embodiment, the third end is located at the top of the inner cavity of the first liquid storage tank;

[0022] Alternatively, the fourth end is located at the top of the inner cavity of the second liquid storage tank;

[0023] Alternatively, the third end is located in the middle of the inner cavity of the first liquid reservoir;

[0024] Alternatively, the fourth end is located in the middle of the inner cavity of the second liquid reservoir.

[0025] In one embodiment, the second valve is a solenoid valve;

[0026] Alternatively, a throttle valve is further provided on the second bypass pipe;

[0027] Alternatively, the second valve is a throttle valve.

[0028] In one embodiment, the first compression assembly includes a first cylinder block and a first muffler provided on the first cylinder block. The first cylinder block is provided with the suction end of the first compression assembly, and the first muffler is provided with the exhaust end of the first compression assembly. The second compression assembly includes a second cylinder block and a second muffler provided on the periphery of the second cylinder block. The second cylinder block is provided with the suction end of the second compression assembly, and the second muffler is provided with the exhaust end of the second compression assembly.

[0029] In one embodiment, the compression device further includes a driving mechanism provided in the housing. The driving mechanism includes a motor and a crankshaft. The motor is used to drive a first piston in the first cylinder block to reciprocate through the crankshaft, so that the suction end of the first compression assembly sucks air, and the exhaust end of the first compression assembly discharges air. And it is used to drive a second piston in the second cylinder block to reciprocate through the crankshaft, so that the suction end of the second compression assembly sucks air, and the exhaust end of the second compression assembly discharges air.

[0030] The present invention also proposes a heat exchange system including the compression device as described above.

[0031] By setting the exhaust end of the first compression assembly to be connected to the first exhaust port through the inner cavity of the housing, and setting the exhaust end of the second compression assembly to be directly connected to the second exhaust port, the first compression assembly is located on the non-direct exhaust side of the compression device, and the second compression assembly is located on the direct exhaust side of the compression device. And by setting the suction end of the first compression assembly to be connected to the first liquid reservoir, setting the suction end of the second compression assembly to the second liquid reservoir, and connecting the first liquid reservoir and the second liquid reservoir through an oil return assembly, the lubricating oil in the second liquid reservoir is refluxed to the first liquid reservoir through the oil return assembly, so that the first compression assembly on the non-direct exhaust side can obtain more lubricating oil through the first liquid reservoir, and the second compression assembly on the non-direct exhaust side can obtain more lubricating oil through the second liquid reservoir, so that more lubricating oil can be retained in the housing through the non-direct exhaust side, reducing the lubricating oil discharged from the direct exhaust side, to prevent the compressor from having a reduction in lubricating oil. Description of the Drawings

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the structures shown in these drawings.

[0033] Figure 1 Schematic structural diagram of an embodiment of the compression device provided by the present invention;

[0034] Figure 2 For Figure 1 Operating schematic diagram of the second valve in

[0035] Figure 3 For Figure 1 Operating schematic diagram of the first valve in

[0036] Figure 4 Schematic structural diagram of another embodiment of the compression device provided by the present invention;

[0037] Figure 5 Schematic structural diagram of yet another embodiment of the compression device provided by the present invention.

[0038] Explanation of the reference numerals in the drawings:

[0039] 100, compression device; 10, compressor; 11, housing; 11a, first exhaust port; 11b, second exhaust port; 121, first compression assembly; 1211, first cylinder block; 1212, first muffler; 122, second compression assembly; 1221, second cylinder block; 1222, second muffler; 13, drive mechanism; 131, motor; 132, crankshaft; 14, second exhaust pipe; 15, first exhaust pipe; 20, first liquid storage tank; 30, second liquid storage tank; 40, gas return assembly; 41, second valve; 42, second bypass pipe; 42a, third end; 42b, fourth end; 50, oil return assembly; 51, first valve; 52, first bypass pipe; 52a, first end; 52b, second end; 61, first connecting pipe; 62, second connecting pipe.

[0040] The realization of the object, functional characteristics, and advantages of the present invention will be further described in conjunction with the embodiments and with reference to the accompanying drawings. Detailed implementation manners

[0041] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0042] It should be noted that if there are directional indications (such as up, down, left, right, front, back,...) involved in the embodiments of the present invention, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0043] In addition, if there are descriptions such as "first", "second", etc. involved in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution where A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0044] A rolling rotor compressor mainly consists of components such as a cylinder, a roller, a sliding vane, upper and lower bearings, and an exhaust valve. Its working principle is that through the rotation of the roller, the gaseous refrigerant is sucked in from the suction hole of the cylinder, and the gaseous refrigerant is compressed through the action of the sliding vane, and finally discharged from the exhaust hole of the cylinder. The high-temperature and high-pressure refrigerant discharged from the exhaust hole of the cylinder then passes through the muffler in sequence, bypasses the stator and rotor of the motor, and finally is discharged from the compressor exhaust pipe. A double-suction and double-discharge rolling rotor compressor is an improved rolling rotor compressor, which is provided with two sets of pump body components. The working process of one set of pump body components is as shown above, and the other set of pump body components passes the high-temperature and high-pressure refrigerant discharged from the exhaust hole of the cylinder through the muffler and then directly discharges it from the compressor through a pipeline. The working components of the former are the non-direct discharge side, and the working components of the latter are the direct discharge side. This working method enables the compressor to simultaneously suck in refrigerants with two suction pressures and compress and discharge refrigerants with two discharge pressures.

[0045] In a double-suction double-row rolling rotor compressor, the lubricating oil in the compressor casing enters the working volume through the gap between the vanes and the vane grooves, and the gap between the rollers and the bearing end faces. For the non-direct discharge side, the lubricating oil is discharged from the muffler along with the refrigerant and enters the compressor casing, thus realizing the circulation of the lubricating oil; for the direct discharge side, the lubricating oil is discharged from the compressor along with the refrigerant through the direct discharge pipe, which directly leads to a reduction in the lubricating oil in the compressor.

[0046] The present invention provides a compression device 100, which solves the problem of lubricating oil reduction in the compression device 100 by redistributing the lubricating oil.

[0047] See also Figure 1 , Figure 3 In one embodiment of the present invention, the compression device 100 includes a compressor 10, a first liquid reservoir 20, a second liquid reservoir 30 and an oil return assembly 50; the compressor 10 includes a shell 11, a first compression assembly 121 and a second compression assembly 122 arranged in the shell 11, the shell 11 has a first exhaust port 11a and a second exhaust port 11b, the exhaust end of the first compression assembly 121 is connected to the first exhaust port 11a through the inner cavity of the shell 11, and the exhaust end of the second compression assembly 122 is directly connected to the second exhaust port 11b; the second liquid reservoir 30 is connected to the suction end of the second compression assembly 122, and the oil return assembly 50 connects the first liquid reservoir 20 and the second liquid reservoir 30. When the oil return assembly 50 is turned on, it is used to return the lubricating oil in the second liquid reservoir 30 to the first liquid reservoir 20.

[0048] In the present invention, the exhaust end of the first compression assembly 121 can be communicated with the inner cavity of the shell 11, and then connected to the corresponding exhaust port through the inner cavity of the shell 11, and the exhaust end of the second compression assembly 122 can be directly connected to the corresponding exhaust port through the second exhaust pipe 14. In this case, the first compression assembly 121 belongs to the non-direct exhaust side, and the second compression assembly 122 belongs to the direct exhaust side. The first liquid reservoir 20, the first compression assembly 121 and the first exhaust port 11a can constitute a first intake and exhaust gas path, and the first intake and exhaust gas path inhales air through the first liquid reservoir 20 and exhausts air through the first exhaust port 11a; the second liquid reservoir 30, the second compression assembly 122, and the second exhaust port 11b can constitute a second intake and exhaust gas path, and the second intake and exhaust gas path inhales air through the second liquid reservoir 30 and exhausts air through the second exhaust port 11b. In addition, the first liquid reservoir 20 and the second liquid reservoir 30 can adopt a split structure or an integral liquid reservoir, and the first liquid reservoir 20 and the second liquid reservoir 30 can be formed by dividing the inner cavity of the integral liquid reservoir into a first liquid storage cavity and a second liquid storage cavity that are independent of each other, and are not limited here.

[0049] It can be understood that the first liquid storage device 20 and the second liquid storage device 30 can be made to communicate through the oil return assembly 50. Generally, the suction and exhaust pressures on the non-direct discharge side are less than those on the direct discharge side. When the suction pressure on the non-direct discharge side is less than the suction pressure on the direct discharge side, there is a pressure difference between the first liquid storage device 20 and the second liquid storage device 30. The internal pressure of the liquid storage device corresponding to the direct discharge side is greater than the internal pressure of the liquid storage device corresponding to the direct discharge side. Therefore, the internal pressure of the second liquid storage device 30 is greater than the internal pressure of the first liquid storage device 20. When the first liquid storage device 20 and the second liquid storage device 30 are made to communicate through the oil return assembly 50, under the action of the pressure difference, the lubricating oil in the second liquid storage device 30 can flow into the first liquid storage device 20 under pressure, so that the first compression assembly 121 on the non-direct discharge side can receive more lubricating oil through the first liquid storage device 20. When the first compression assembly 121 exhausts, more lubricating oil can be obtained by the inner cavity of the housing 11 through the first compression assembly 121. At the same time, since there is less lubricating oil flowing out of the second liquid storage device 30, the second compression assembly 122 on the direct discharge side obtains less lubricating oil through the second liquid storage device 30, thereby preventing more lubricating oil from being directly discharged from the direct discharge side, and thus preventing the reduction of lubricating oil in the compression device 100. Of course, in other embodiments, the oil return assembly 50 can also be provided with a pump structure, and the lubricating oil in the second liquid storage device 30 can be directly pumped into the first liquid storage device 20 to realize the return of the lubricating oil, which is not limited here.

[0050] In the present invention, the exhaust end of the first compression assembly 121 is connected to the first exhaust port 11a through the inner cavity of the housing 11, the exhaust end of the second compression assembly 122 is directly connected to the second exhaust port 11b, so that the first compression assembly 121 is on the non-direct discharge side of the compression device 100, the second compression assembly 122 is on the direct discharge side of the compression device 100, the suction end of the first compression assembly 121 is connected to the first liquid storage device 20, the suction end of the second compression assembly 122 is connected to the second liquid storage device 30, and the first liquid storage device 20 and the second liquid storage device 30 are connected through the oil return assembly 50. The lubricating oil in the second liquid storage device 30 is returned to the first liquid storage device 20 through the oil return assembly 50, so that the first compression assembly 121 on the non-direct discharge side can obtain more lubricating oil through the first liquid storage device 20, the second compression assembly 122 on the non-direct discharge side can obtain more lubricating oil through the second liquid storage device 30, and more lubricating oil can be retained in the housing through the non-direct discharge side, reducing the lubricating oil discharged from the direct discharge side, to prevent the reduction of lubricating oil in the compression device 100.

[0051] Since the lubricating oil is in a liquid state, compared with the gaseous refrigerant, the lubricating oil is more likely to be located below the liquid storage device. That is to say, there is more lubricating oil in the lower position of the inner cavity of the liquid storage device. When introducing the lubricating oil into the first liquid storage device 20, in order to make more lubricating oil be introduced into the first liquid storage device 20, refer to Figure 1 、Figure 3 As shown, in one embodiment, the oil return assembly 50 includes a first bypass pipe 52 connecting the first liquid storage container 20 and the second liquid storage container 30. The first bypass pipe 52 has a first end 52a communicating with the first liquid storage container 20 and a second end 52b communicating with the second liquid storage container 30. The first end 52a is located at the bottom of the inner cavity of the first liquid storage container 20, and the second end 52b is located at the bottom of the inner cavity of the second liquid storage container 30.

[0052] Thus, by providing that the oil return assembly 50 includes the first bypass pipe 52, the lubricating oil in the first liquid storage container 20 can flow into the second liquid storage container 20 through the first bypass pipe 52. Moreover, the liquid lubricating oil can enter the first liquid storage container 20 from the bottom end position of the second liquid storage container 30 through the first bypass pipe 52 under the action of the pressure difference between the inner cavities of the first liquid storage container 20 and the second liquid storage container 30. Even when there is less liquid refrigerant in the second liquid storage container 30, the flow of lubricating oil into the first liquid storage container 20 can be realized, thereby effectively preventing the reduction of lubricating oil in the housing 11.

[0053] When the first compression assembly 121 discharges gas towards the first exhaust port 11a, the refrigerant flows from the exhaust end of the first compression assembly 121 towards the first exhaust port 11a. The lubricating oil mixed in the refrigerant can flow in the inner cavity of the housing 11, enter the kinematic pairs of the first compression assembly 121 through the gaps of the first compression assembly 121, and enter the kinematic pairs of the second compression assembly 122 through the gaps of the second compression assembly 122 to supply oil to the kinematic pairs, thereby realizing the lubrication of the kinematic pairs. Among them, when the first compression assembly 121 and the second compression assembly 122 are the compression assemblies in the rolling rotor compression device 100, the kinematic pairs can be structures such as a crankshaft, a sliding vane, a bearing, and a piston. At this time, when the suction pressure of the first compression assembly 121 is less than the suction pressure of the second compression assembly 122, the oil return assembly 50 can be used to connect the first liquid storage container 20 with a smaller internal pressure and the second liquid storage container 30 with a larger internal pressure, so that the lubricating oil can flow from the second liquid storage container 30 into the first liquid storage container 20 under the action of the pressure difference, to increase the content of lubricating oil on the non-direct discharge side and reduce the content of lubricating oil on the direct discharge side, thereby ensuring that more lubricating oil can be obtained through the non-direct discharge side in the housing 11 and preventing the reduction of lubricating oil in the compression device.

[0054] Refer to Figure 1 、 Figure 3As shown, in one embodiment, the oil return assembly further includes a first valve 51 disposed on the first bypass pipe 52. The first valve 51 conducts unidirectionally from the second end 52b to the first end 52a. When the suction pressure of the first compression assembly 121 is greater than the suction pressure of the second compression assembly 122, the first bypass pipe 52 is used to return the lubricating oil from the second liquid storage device 30 to the first liquid storage device 20.

[0055] In the above embodiment, the first valve 51 can be set as a check valve, which conducts unidirectionally from the second end 52b to the first end 52a through the first valve 51. Only when the suction pressure at the suction end of the second compression assembly 122 is greater than the suction pressure at the suction end of the first compression assembly 121, the first bypass pipe 52 will be conducted. In other cases, the first bypass pipe 52 is in a disconnected state, which can prevent further loss of lubricating oil. Moreover, the check valve can automatically conduct unidirectionally according to the pressure change at both ends, so that the corresponding pressure detection element can be omitted, making the structure of the oil return assembly simpler.

[0056] Alternatively, a throttle valve can also be provided on the first bypass pipe 52. In this way, the opening degree of the first bypass pipe 52 can be controlled by the throttle valve, so as to control the flow rate of the lubricating oil flowing from the second liquid storage device 30 to the first liquid storage device 20, thereby realizing the control of the replenishing speed of the lubricating oil in the housing 10.

[0057] In the second embodiment of the present invention, the first valve 51 can also conduct bidirectionally between the first end 52a and the second end 52b. In this case, a corresponding pressure detection mechanism needs to be set. Only when the corresponding pressure condition is detected, the first valve 51 is used to conduct between the first end 52a and the second end 52b. The relevant settings are as follows. Optionally, the oil return assembly further includes a first valve 51 disposed on the first bypass pipe 52, and the first valve 51 conducts bidirectionally between the first end 52a and the second end 52b;

[0058] The first valve 51 is configured to conduct the first bypass pipe 52 when receiving a first control signal indicating that the suction pressure of the second compression assembly 122 is greater than the suction pressure of the first compression assembly 121, so that the lubricating oil flows back from the second liquid storage device 30 to the first liquid storage device 20 under the action of the pressure difference; and to cut off the first bypass pipe 52 when receiving a second control signal indicating that the suction pressure of the second compression assembly 122 is not greater than the suction pressure of the first compression assembly 121.

[0059] In the above embodiments, the suction pressure of the first compression assembly 121 and the suction pressure of the second compression assembly 122 can be detected by providing corresponding pressure detection modules on the pipelines connecting the heat exchange system and the compression device 100. The first valve 51 of the compression device 100 and the pressure detection module are respectively electrically connected to the central control unit of the heat exchange system applied by the compression device 100. During the operation of the pressure detection module, it transmits corresponding pressure signals to the central control unit of the system. When the central control unit receives the signal that the suction pressure of the second compression assembly 122 is greater than the suction pressure of the first compression assembly 121, the central control unit sends a first control signal to the first valve 51. When the first valve 51 receives the first control signal, the first valve 51 can make corresponding actions according to the first control signal to conduct the first bypass pipe 52. When the suction pressure of the first compression assembly 122 is less than the suction pressure of the second compression assembly 122 and the internal pressure of the first liquid reservoir 20 is less than the internal pressure of the second liquid reservoir 30, the lubricating oil flows from the second liquid reservoir 30 into the first liquid reservoir 20 under the action of the pressure difference, so that the first compression assembly 121 obtains more lubricating oil and the second compression assembly 122 discharges less lubricating oil. When the central control unit receives the signal that the suction pressure of the first compression assembly 121 is greater than or equal to the suction pressure of the second compression assembly 122, the central control unit sends a second control signal to the first valve 51. When the first valve 51 receives the corresponding second control signal, the first valve 51 can make corresponding actions according to the second control signal to cut off the first bypass pipe 51.

[0060] Or in other embodiments, the suction pressure of the first compression assembly 121 and the suction pressure of the second compression assembly 122 can also be judged by detecting the temperature situation by providing a temperature detection module on the pipeline connecting the heat exchange system and the compression device 100.

[0061] When the first valve 51 conducts the first end 52a and the second end 52b in both directions, as Figure 4 shown, the first valve 51 can be set as an electromagnetic valve. Thus, the on-off state of the second bypass pipe 42 can be accurately controlled in an electric control manner. Only when it is detected that the suction pressure at the suction end of the second compression assembly 122 is greater than the suction pressure at the suction end of the first compression assembly 121, the first valve 51 is controlled to act by the control terminal to conduct the first bypass pipe 52.

[0062] Or, as Figure 5As shown, when the first valve 51 conducts the first end 52a and the second end 52b in both directions, the first valve 51 can also be directly set as a throttle valve. When it is detected that the suction pressure at the suction end of the second compression assembly 122 is greater than the suction pressure at the suction end of the first compression assembly 121, the throttle valve serving as the first valve 51 is controlled to open by the control terminal, and the opening degree of the first bypass pipe 52 is controlled by the first valve 51 to control the flow rate of the lubricating oil flowing from the second liquid storage device 30 to the first liquid storage device 20, which is not limited herein.

[0063] In addition, for the working condition where the exhaust pressures on the non-direct exhaust side and the direct exhaust side of the compressor are not equal, the refrigerant on the high exhaust pressure side will leak out from the pump body through the gaps between the sliding vane and the sliding vane groove, and between the roller and the bearing end face, and flow into the pump body on the medium exhaust pressure side through the gaps between the sliding vane and the sliding vane groove, and between the roller and the bearing end face. This directly leads to the problem of refrigerant enrichment in the medium exhaust pressure side system of the compressor and refrigerant shortage in the high exhaust pressure side system.

[0064] To solve the above problems, as Figure 1 、 Figure 2 shown, in an embodiment, the compression device further includes a gas return assembly 40, and the gas return assembly 40 is connected to the first liquid storage device 20 and the second liquid storage device 30;

[0065] The gas return device 40 is configured to conduct the first liquid storage device 20 and the second liquid storage device 30 when receiving a third control signal indicating that the exhaust pressure of the first compression assembly 121 is greater than the exhaust pressure of the second compression assembly 122 and the suction pressure of the first compression assembly 121 is less than the suction pressure of the second compression assembly 122, so that the refrigerant flows from the first liquid storage device 20 to the second liquid storage device 30 under the action of the pressure difference.

[0066] In the above embodiments, corresponding pressure detection modules may be provided on the pipelines connecting the heat exchange system and the compression device 100 to detect the suction and discharge pressures of the first compression assembly 121 and the suction and discharge pressures of the second compression assembly 122. The refrigerant return device 40 of the compression device 100 and the pressure detection module are respectively electrically connected to the central control unit of the heat exchange system applied by the compression device 100. It can be understood that, generally, the discharge pressure of the first compression assembly 121 (non-direct discharge side) is small, and the discharge pressure of the second compression assembly 122 (direct discharge side) is large. During the startup stage of the compression device 100, since the system pressure of the compression device 100 has not been balanced, the refrigerant flow path in the second suction and discharge gas path is direct, with small resistance and fast discharge speed, resulting in a small suction pressure. The refrigerant flow path in the first suction and discharge gas path is complex, with large resistance and slow discharge speed, and there is a transient "pressure buildup" phenomenon due to local resistance, resulting in an instantaneous increase in pressure and a large suction pressure, thus causing the suction pressure of the first compression assembly 121 to be greater than the suction pressure of the second compression assembly 122.

[0067] In this case, the corresponding pressure signals are transmitted to the central control unit of the system through the pressure detection module. When the central control unit receives the signal that the discharge pressure of the first compression assembly 121 is greater than the discharge pressure of the second compression assembly 122 and the suction pressure of the first compression assembly 121 is less than the suction pressure of the second compression assembly 122, the central control unit sends a third control signal to the refrigerant return device 40. When the refrigerant return device 40 receives the third control signal, the refrigerant return device 40 makes corresponding actions according to the third control signal, conducts the first liquid storage device 20 and the second liquid storage device 30. Under the action of the pressure difference, part of the refrigerant flows from the first liquid storage device 20 into the second liquid storage device 30, realizing the redistribution of the refrigerant between the first liquid storage device 20 and the second liquid storage device 30, preventing the enrichment of the refrigerant in the first liquid storage device 20, which may cause the first compression assembly 121 corresponding to the first liquid storage device 20 to receive too much refrigerant. At the same time, the second compression assembly 122 corresponding to the second liquid storage device 30 can receive more refrigerant. Even inside the housing 11, under the action of the pressure difference, the refrigerant in the second compression assembly 122 flows into the first compression assembly 121, and it will not cause the problem of too much refrigerant in the first compression assembly 121 and too little refrigerant in the second compression assembly 122.

[0068] Alternatively, in another embodiment, to prevent the refrigerant from flowing from the gap of the first compression assembly 121 through the inner cavity of the housing 11 to the gap of the second compression assembly 122, resulting in refrigerant enrichment in the second suction and exhaust gas path on the medium-pressure side and refrigerant shortage in the first suction and exhaust gas path on the high-pressure side, optionally, when receiving a fourth control signal indicating that the exhaust pressure of the first compression assembly 121 is less than the exhaust pressure of the second compression assembly 122 and the suction pressure of the first compression assembly 121 is greater than the suction pressure of the second compression assembly 122, the first liquid reservoir 20 and the second liquid reservoir 30 are conducted, so that under the action of the pressure difference, the refrigerant flows from the second liquid reservoir 30 to the first liquid reservoir 20.

[0069] In this way, when the central control unit receives a signal that the exhaust pressure of the first compression assembly 121 is less than the exhaust pressure of the second compression assembly 122 and the suction pressure of the first compression assembly 121 is greater than the suction pressure of the second compression assembly 122, the central control unit can send a fourth control signal to the gas return device 40. The gas return device 40 can perform corresponding actions according to the received fourth control signal, conduct the first liquid reservoir 20 and the second liquid reservoir 30, and under the action of the pressure difference, make the refrigerant flow from the second liquid reservoir 30 into the first liquid reservoir 20. In this way, the first compression assembly 121 (non-direct exhaust side) on the high-pressure exhaust side can receive more refrigerant, preventing refrigerant shortage in the first suction and exhaust gas path of the first compression assembly 121.

[0070] Alternatively, in other embodiments, the central control unit can also perform corresponding actions on the above two pressure conditions simultaneously, making the first liquid reservoir 20 and the second liquid reservoir 30 conduct, so that when the first compression assembly 121 is the high-pressure exhaust side and the second compression assembly 122 is the low-pressure exhaust side, or when the first compression assembly 121 is the low-pressure exhaust side and the second compression assembly 122 is the high-pressure exhaust side, refrigerant enrichment in one compression assembly and refrigerant shortage in the other compression assembly can be prevented.

[0071] As Figure 1 、 Figure 2 shown, in one embodiment, the gas return assembly 40 includes:

[0072] A second bypass pipe 42 connecting the first liquid reservoir 20 and the second liquid reservoir 30; and

[0073] A second valve 41 provided on the second bypass pipe 42 for controlling the conduction or cut-off of the second bypass pipe 42.

[0074] With such a setting, the return air assembly 40 can connect and conduct the first liquid storage device 20 and the second liquid storage device 30 by connecting the first liquid storage device 20 and the second liquid storage device 30 through the second bypass pipe 42 and controlling the on-off of the second bypass pipe 42 through the second valve 41. Under the action of the pressure difference, the first liquid storage device 20 and the second liquid storage device 30 can redistribute the refrigerant. When the exhaust pressure of the first compression assembly 121 is greater than the exhaust pressure of the second compression assembly 122, and the suction pressure of the first compression assembly 121 is less than the suction pressure of the second compression assembly 122, or when the exhaust pressure of the first compression assembly 121 is less than the exhaust pressure of the second compression assembly 122, and the suction pressure of the first compression assembly 121 is greater than the suction pressure of the second compression assembly 122, the refrigerant can flow into the liquid storage device with a lower pressure, so that the compression assembly with a lower suction pressure and a higher exhaust pressure can receive more refrigerant, preventing the lack of refrigerant in the compression assembly on the high-pressure side and the enrichment of refrigerant in the compression assembly on the low-pressure side in the shell, resulting in a large difference in the amount of refrigerant discharged from the first exhaust port 11a and the second exhaust port 11b of the compression device 100, and making the distribution of the refrigerant discharged from the first exhaust port 11a and the second exhaust port 11b more balanced.

[0075] As Figure 1 , Figure 2 shown, optionally, in an embodiment, the second bypass pipe 42 has a third end 42a communicating with the first liquid storage device 20 and a fourth end 42b communicating with the second liquid storage device 30. The third end 42a is located above the highest liquid level in the inner cavity of the first liquid storage device 20, and the fourth end 42b is located above the highest liquid level in the inner cavity of the second liquid storage device 30. By making the third end 42a located above the highest liquid level in the inner cavity of the first liquid storage device 20 and the fourth end 42a located above the highest liquid level in the inner cavity of the second liquid storage device 30, it can prevent the input and output ends of the second bypass pipe 42 from being flooded by the liquid refrigerant or the mixture of liquid refrigerant and lubricating oil in the liquid storage device, resulting in the refrigerant in the first liquid storage device 20 being unable to flow into the second liquid storage device 30 under the action of the pressure difference, thereby avoiding the problem of inability to redistribute the refrigerant.

[0076] As Figure 1 shown, when the highest liquid level of the first liquid storage device 20 is designed to be relatively high, the third end 42a of the second bypass pipe 42 can be located at the top of the inner cavity of the first liquid storage device 20, so as to prevent the third end 42a from being flooded when the liquid level in the first liquid storage device 20 is relatively high; As Figure 2As shown, or when the highest liquid level in the first liquid storage device 20 is designed to be relatively low, the third end 42a can be located in the middle of the inner cavity of the first liquid storage device 20, as long as the third end 42a is above the lowest liquid level of the first liquid storage device 20. The setting position of the fourth end 42b of the second bypass pipe 42 can be the same, respectively referring to Figure 1 , Figure 2 As shown, when the highest liquid level of the second liquid storage device 30 is designed to be relatively high, the fourth end 42b can be located at the top of the inner cavity of the second liquid storage device 30; or when the highest liquid level of the first liquid storage device 20 is designed to be relatively low, the fourth end 42b is located in the middle of the inner cavity of the second liquid storage device 30.

[0077] Optionally, the second valve 41 is a solenoid valve; by setting the second valve 41 as a solenoid valve, the on-off state of the second bypass pipe 42 can be accurately controlled in an electric control manner, and the solenoid valve can achieve a two-way conduction function. When the exhaust pressure of the first exhaust port 11a is greater than the exhaust pressure of the second exhaust port 11b and the suction pressure of the suction end of the first compression assembly 121 is less than the suction pressure of the suction end of the second compression assembly 122, the refrigerant can flow from the first liquid storage device 20 to the second liquid storage device 30. When the exhaust pressure of the first exhaust port 11a is less than the exhaust pressure of the second exhaust port 11b and the suction pressure of the suction end of the first compression assembly 121 is greater than the suction pressure of the suction end of the second compression assembly 122, the refrigerant can flow from the second liquid storage device 30 to the second liquid storage device 30, so that no matter which of the first compression assembly 121 and the second compression assembly 122 is located on the high-pressure side, the redistribution of the refrigerant in the compression device 100 can be achieved.

[0078] Or, a throttle valve is further provided on the second bypass pipe 42; in this way, the opening degree of the second bypass pipe 42 can be controlled through the throttle valve, so as to control the distribution speed of the refrigerant between the first liquid storage device 20 and the second liquid storage device 30. Or, as Figure 5 shown, the second valve 41 can also be a throttle valve, and the opening degree of the second bypass pipe 42 can be directly controlled through the second valve 41 to control the distribution speed of the refrigerant between the first liquid storage device 20 and the second liquid storage device 30, which is not limited here.

[0079] The specific structure of the compressor 10 will be introduced below.

[0080] As Figure 1As shown, in one embodiment, the first compression assembly 121 includes a first cylinder block 1211 and a first muffler 1212 provided on the first cylinder block 1211. The first cylinder block 1211 is provided with the suction end of the first compression assembly 121, and the first muffler 1212 is provided with the exhaust end of the first compression assembly 121. The second compression assembly 122 includes a second cylinder block 1221 and a second muffler 1222 provided on the periphery of the second cylinder block 1221. The second cylinder block 1221 is provided with the suction end of the second compression assembly 122, and the second muffler 1222 is provided with the exhaust end of the second compression assembly 122.

[0081] Wherein, pistons are arranged in both the first cylinder block 1211 and the second cylinder block 1221. Through the reciprocating motion of the piston in the first cylinder block 1211, the first cylinder block 1211 can suck gaseous refrigerant from the suction end of the first compression assembly 121, compress the gaseous refrigerant in the first cylinder block 1211, and then discharge the refrigerant into the housing 11 from the exhaust end of the first compression assembly 121, and discharge it through the first exhaust port 11a of the housing 11. Through the reciprocating motion of the piston in the second cylinder block 1221, the second cylinder block 1221 can suck gaseous refrigerant from the suction end of the second compression assembly 122, compress the gaseous refrigerant in the second cylinder block 1221, and then discharge it through the second exhaust port 11b through the second exhaust pipe 14. Arranging the exhaust end of the first compression assembly 121 in the first muffler 1212 and arranging the exhaust end of the second compression assembly 122 in the second muffler 1222 can reduce the noise of refrigerant discharge, thereby reducing the operating noise of the compression device 100.

[0082] In addition, the compression device further includes a drive mechanism 13 provided in the housing 11. The drive mechanism 13 includes a motor 131 and a crankshaft 132. The motor 131 is used to drive the first piston in the first cylinder block 1211 to reciprocate through the crankshaft 132, so that the suction end of the first compression assembly 121 sucks air, the exhaust end of the first compression assembly 121 exhausts air, and is used to drive the second piston in the second cylinder block 1221 to reciprocate through the crankshaft 132, so that the suction end of the second compression assembly 122 sucks air, and the exhaust end of the second compression assembly 122 exhausts air.

[0083] Wherein, one end of the crankshaft 132 is connected to the output end of the motor 131, and the other end of the crankshaft 132 is simultaneously connected to the first piston and the second piston. When the motor 131 is started, the first piston can be driven by the crankshaft 132 to perform eccentric motion in the first cylinder block 1211, so that the first suction and exhaust air path realizes the processes of suction, compression and exhaust. The second piston can be driven by the crankshaft 132 to perform eccentric motion in the second cylinder block 1221, so that the second suction and exhaust air path realizes the processes of suction, compression and exhaust.

[0084] In the present invention, a first suction pipe, a second suction pipe, a first exhaust pipe 15, and a second exhaust pipe 14 may be provided on the housing 11. One end of the first suction pipe protrudes outward from the housing 11 as the first suction port of the housing 11, and the other end is located inside the housing 11 and is connected to the suction end of the first compression assembly 121. The second suction pipe protrudes outward from the housing 11 as the second suction port of the housing 11, and the other end is located inside the housing 11 and is connected to the suction end of the second compression assembly 122. One end of the first exhaust pipe 15 protrudes outward from the housing 11 as the first exhaust port 11a, and the other end of the first exhaust pipe 15 is located in the inner cavity of the housing 11 and is in communication with the inner cavity of the housing 11. One end of the second exhaust pipe 14 protrudes outward from the housing 11 as the second exhaust port 11b, and the other end of the second exhaust pipe 14 is connected to the exhaust end of the second compression assembly 122.

[0085] In addition, in the present invention, the compression device 100 further includes a first connection pipe 61 and a second connection pipe 62. The first connection pipe 61 connects the first liquid storage device 20 and the first suction port, and the second connection pipe 62 connects the second liquid storage device 30 and the second suction port.

[0086] The compression device 100 of the present invention can be applied to a heat exchange system. Among them, the first suction and exhaust gas path and the second suction and exhaust gas path can be connected to two different heat exchange systems, and the suction and exhaust pressures of the two suction and exhaust gas paths are different according to the operating states of the two heat exchange systems.

[0087] When the compression device 100 of the present invention is applied to a heat exchange system, the applied heat exchange system may include a first evaporator and a first condenser, as well as a second evaporator and a second condenser. Among them, the first suction and exhaust gas path can be arranged between the first evaporator and the first condenser. After the refrigerant evaporates and absorbs heat in the first evaporator, it flows to the first suction and exhaust gas path, is compressed by the first compression assembly 121, then flows to the first condenser to condense and release heat, and then the refrigerant flows to the first evaporator after being throttled and depressurized by a throttling element. The second suction and exhaust gas path can be arranged between the second evaporator and the second condenser. After the refrigerant evaporates and absorbs heat in the first evaporator, it flows to the first suction and exhaust gas path, is compressed by the first compression assembly 121, then flows to the first condenser to condense and release heat, and then the refrigerant flows to the first evaporator after being throttled and depressurized by a throttling element.

[0088] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structural transformation made under the technical concept of the present invention by using the content of the specification and drawings of the present invention, or any direct / indirect application in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A compression device, characterized in that, include: A compressor, comprising a shell, a first compression assembly and a second compression assembly arranged in the shell, the shell having a first exhaust port and a second exhaust port, the exhaust end of the first compression assembly is connected to the first exhaust port through the inner cavity of the shell, and the exhaust end of the second compression assembly is directly connected to the second exhaust port; a first liquid reservoir connected to the suction end of the first compression assembly; a second liquid reservoir connected to the suction end of the second compression assembly; as well as The oil return assembly connects the first liquid reservoir and the second liquid reservoir, and when the oil return assembly is turned on, it is used to return the lubricating oil in the second liquid reservoir to the first liquid reservoir.

2. The compression device according to claim 1, wherein The oil return assembly includes a first bypass pipe connecting the first liquid reservoir and the second liquid reservoir, the first bypass pipe having a first end connected to the first liquid reservoir and a second end connected to the second liquid reservoir, the first end is located at the bottom of the inner cavity of the first liquid reservoir, and the second end is located at the bottom of the inner cavity of the second liquid reservoir.

3. The compression device according to claim 2, characterized in that, The oil return assembly also includes a first valve arranged on the first bypass pipe, the first valve unidirectionally connects the second end to the first end, and when the suction pressure of the first compression assembly is greater than the suction pressure of the second compression assembly, the first bypass pipe is used to return the lubricating oil from the second reservoir to the first reservoir.

4. The compression device according to claim 3, wherein, The first bypass pipe is also provided with a throttle valve, and the throttle valve is used to control the opening size of the first bypass pipe.

5. The compression device according to claim 2, wherein The oil return assembly further includes a first valve disposed on the first bypass pipe, the first valve bidirectionally connecting the first end and the second end; The first valve is used to open the first bypass pipe when receiving a first control signal indicating that the suction pressure of the second compression assembly is greater than the suction pressure of the first compression assembly, so that the lubricating oil flows back from the second reservoir to the first reservoir under the action of the pressure difference; When a second control signal indicating that the suction pressure of the second compression component is not greater than the suction pressure of the first compression component is received, the first bypass pipe is cut off.

6. The compression device according to claim 5, characterized in that, The first valve is a solenoid valve or a throttle valve.

7. The compression device according to claim 1, characterized in that, The compression device further comprises an air return assembly, wherein the air return assembly is connected to the first liquid reservoir and the second liquid reservoir; The air return device is used to conduct the first liquid reservoir and the second liquid reservoir when receiving a third control signal indicating that the exhaust pressure of the first compression component is greater than the exhaust pressure of the second compression component and the suction pressure of the first compression component is less than the suction pressure of the second compression component, so that the refrigerant flows from the first liquid reservoir to the second liquid reservoir under the action of the pressure difference; And / or, when a fourth control signal is received, which indicates that the exhaust pressure of the first compression component is less than the exhaust pressure of the second compression component, and the suction pressure of the first compression component is greater than the suction pressure of the second compression component, the first liquid reservoir and the second liquid reservoir are connected to allow the refrigerant to flow from the second liquid reservoir to the first liquid reservoir under the action of the pressure difference.

8. The compression device according to claim 7, characterized in that, The air return assembly comprises: a second bypass pipe connecting the first liquid reservoir and the second liquid reservoir; and The second valve is provided on the second bypass pipe and is used to control the on or off state of the second bypass pipe.

9. The compression device according to claim 8, characterized in that, The second bypass pipe has a third end communicating with the first liquid storage container and a fourth end communicating with the second liquid storage container. The third end is above the highest liquid level in the inner cavity of the first liquid storage container, and the fourth end is above the highest liquid level in the inner cavity of the second liquid storage container.

10. The compression device according to claim 9, wherein, The third end is located at the top of the inner cavity of the first liquid storage container; or, the fourth end is located at the top of the inner cavity of the second liquid storage container; or, the third end is located in the middle of the inner cavity of the first liquid storage container; or, the fourth end is located in the middle of the inner cavity of the second liquid storage container.

11. The compression device according to claim 8, characterized in that, The second valve is a solenoid valve; or, a throttle valve is further provided on the second bypass pipe; or, the second valve is a throttle valve.

12. The compression device according to any one of claims 1 to 11, characterized in that, The first compression assembly includes a first cylinder block and a first silencer provided on the first cylinder block. The first cylinder block is provided with the suction end of the first compression assembly, and the first silencer is provided with the exhaust end of the first compression assembly. The second compression assembly includes a second cylinder block and a second silencer provided around the second cylinder block. The second cylinder block is provided with the suction end of the second compression assembly, and the second silencer is provided with the exhaust end of the second compression assembly.

13. The compression device according to claim 12, wherein The compression device further includes a driving mechanism provided in the housing. The driving mechanism includes a motor and a crankshaft. The motor is used to drive the first piston in the first cylinder block to reciprocate through the crankshaft, so that the suction end of the first compression assembly sucks air, the exhaust end of the first compression assembly exhausts air, and is used to drive the second piston in the second cylinder block to reciprocate through the crankshaft, so that the suction end of the second compression assembly sucks air, and the exhaust end of the second compression assembly exhausts air.

14. A heat exchange system, characterized in that, Comprising the compression device according to any one of claims 1 to 13.

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