compressor

Abstract

The present invention discloses a compressor, including a first compression assembly, a second compression assembly and a liquid reservoir, wherein the upper end of the liquid reservoir is provided with a total air inlet connected to an internal liquid storage cavity, the air inlet of the second compression assembly is connected to the liquid storage cavity through a pipeline, and the upper end opening of the pipeline is higher than the cavity bottom, the exhaust port of the first compression assembly is connected to the total exhaust port, the exhaust port of the second compression assembly is connected to the air inlet of the first compression assembly through an exhaust channel, the exhaust channel is arranged through the liquid reservoir, and the inner cavity of the exhaust channel can achieve heat exchange with the inner cavity of the liquid reservoir. When the exhaust channel passes through the liquid reservoir, the gas in the liquid reservoir is heated, thereby reducing the overall inlet and outlet temperature difference of the compressor, which is beneficial to protecting various components of the compressor, and at the same time, it is beneficial to reduce the temperature of the exhaust gas of the first compression assembly, further protecting the compressor, and effectively reducing energy consumption.

Description

Technical Field

[0001] The present invention relates to the field of compression technology, and more particularly to a compressor. Background Art

[0002] In the refrigeration industry, two-stage compression technology is mainly used to solve the problem of increased pressure ratio after the evaporation temperature is too low or the condensation temperature is too high. In recent years, two-stage rotary compressors are one of the options for heat pump air conditioning systems under extreme temperatures. For example, heat pump water heaters use two-stage compression to obtain high-temperature hot water.

[0003] Based on the performance of two-stage compression and single-stage compression under different operating conditions, in order to optimize the energy efficiency of the whole machine throughout the year, mode switching according to different system requirements is the development trend of two-stage compression technology. The current mode-switchable two-stage compressor has a large temperature difference in the whole machine in the two-stage mode, and a large difference in the suction state of the two compression components in the single-stage mode, which makes the compressor's operation stability poor and reliability low, thus affecting the compressor life.

[0004] In summary, how to effectively extend the service life of current compressors is a problem that technical personnel in this field urgently need to solve. Summary of the invention

[0005] In view of this, an object of the present invention is to provide a compressor which can effectively extend the service life of the current compressor.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A compressor comprises a first compression assembly, a second compression assembly and a liquid reservoir, wherein the upper end of the liquid reservoir is provided with a total air inlet connected to a liquid storage cavity inside the liquid reservoir, the air inlet of the second compression assembly is connected to the liquid storage cavity through a pipeline and the upper end opening of the pipeline is higher than the cavity bottom of the liquid storage cavity, the exhaust port of the first compression assembly is connected to the total exhaust port, the exhaust port of the second compression assembly is connected to the air inlet of the first compression assembly through an exhaust channel, the exhaust channel is arranged through the liquid reservoir, and the inner cavity of the exhaust channel can achieve heat exchange with the inner cavity of the liquid reservoir.

[0008] In this compressor, when in use, the first compression assembly and the second compression assembly are both started, and then the air inlet of the second compression assembly is sucked into a negative pressure state, so that the gas in the liquid reservoir enters the air inlet of the second compression assembly through the pipeline, and the gas in the liquid reservoir will be replenished through the main air inlet. The second compression assembly compresses the gas and discharges it. The temperature and pressure of the discharged gas increase, and then it enters the air inlet of the first compression assembly through the exhaust channel, and then it is further compressed and heated by the first compression assembly. At the same time, when the exhaust channel passes through the liquid reservoir, the gas in the liquid reservoir is heated to cool the gas entering the first compression assembly and heat the gas entering the second compression assembly, thereby reducing the overall inlet and outlet temperature difference of the compressor, which is beneficial to protecting the various components of the compressor. At the same time, it is beneficial to reduce the temperature of the gas discharged from the first compression assembly, further protecting the compressor, and effectively reducing energy consumption. In summary, this compressor can effectively extend the service life of current compressors.

[0009] Preferably, it also includes a three-way joint, a valve for closing the first interface of the three-way joint, and an elastic device for pushing the valve to move. The exhaust port of the second compression assembly is connected to the main exhaust port through the first switch valve, and is connected to the exhaust channel through the second switch valve. The three-way joint is connected in series on the exhaust channel so that the second interface of the three-way joint is connected to the exhaust port of the second compression assembly through the second switch valve, and the air inlet of the first compression assembly is connected to the third interface of the three-way joint. The first interface is connected to the liquid storage chamber through a pipeline and the upper end opening of the pipeline is higher than the bottom of the chamber. The valve is opened and closed by the pressure difference force formed by the opening and closing of the second switch valve, which is opposite to the driving force of the elastic device, and the valve is closed when the second switch valve is opened, and the valve is opened when the second switch valve is closed.

[0010] Preferably, the pipeline also includes an exhaust pipe which is the exhaust channel, the three-way joint is located at the lower end of the liquid reservoir and outside the liquid reservoir, the exhaust pipe penetrates into the liquid reservoir in a vertical direction, and the two ends are respectively connected to the second switch valve and the second interface.

[0011] Preferably, the first interface is connected to a first air inlet pipe extending into the liquid storage chamber, and the air inlet port of the second compression assembly is connected to a second air inlet pipe extending into the liquid storage chamber, and the air inlet port of the first air inlet pipe and the air inlet port of the second air inlet pipe are arranged at the same height.

[0012] Preferably, it includes a first connecting pipe and a second connecting pipe, the inner cavity of the pipe of the first connecting pipe and the inner cavity of the pipe of the second connecting pipe are both the exhaust channel, the three-way joint is located in the liquid storage cavity of the liquid reservoir, the first connecting pipe penetrates into the liquid reservoir from the top of the liquid reservoir and its two ends are respectively connected to the second interface and the second switch valve, the second connecting pipe penetrates into the liquid reservoir from the bottom of the liquid reservoir and its two ends are respectively connected to the third interface and the air inlet of the first compression assembly.

[0013] Preferably, the first interface is connected to a first air intake pipe connected to the liquid storage chamber, the air intake of the second compression assembly is connected to a second air intake pipe extending into the liquid storage chamber, and the pipe opening of the first air intake pipe and the pipe opening of the second air intake pipe are arranged at the same height.

[0014] Preferably, the three-way connector is located at the upper part of the liquid storage chamber.

[0015] Preferably, the driving force of the elastic device is used to drive the valve to close, and when the second switch valve is closed, the pressure difference formed by the gas pressure entering the total air inlet and the air pressure in the three-way joint can overcome the elastic deformation force of the elastic device to push the valve to open.

[0016] Preferably, the valve is located in the first interface, with one side facing the first interface inlet and the other side connected to the elastic device. The elastic device is a compression spring and its two ends are respectively against the inner cavity wall of the valve and the three-way joint.

[0017] Preferably, the valve is slidably matched with the inner cavity of the three-way joint, a first closed cavity is provided at one end of the three-way joint, and the elastic device is provided inside the first closed cavity, and a second closed cavity is provided at the other end of the three-way joint, and the second closed cavity is connected to the second interface through a capillary, so that when the second switch valve is opened, the valve is pushed to slide to close the first interface and the elastic device is compressed and deformed, and when the second switch valve is closed, the elastic device pushes the valve to slide in the opposite direction to open the first interface.

[0018] Preferably, the three-way joint also includes: an intermediate transverse cavity portion, the first closed cavity and the second closed cavity are respectively arranged at two ends of the intermediate transverse cavity portion, the first interface is arranged in the middle portion of the intermediate transverse cavity portion close to the second closed cavity, the second interface is arranged close to the first closed cavity, and the third interface is arranged between the first interface and the second interface; a valve block arranged at the first closed cavity for blocking the second interface, the valve is arranged at the second closed cavity, the valve block and the valve are connected by a connecting rod, the elastic device is abutted against a side of the valve block away from the valve, and the distance between the valve and the valve block is greater than the distance between the first interface and the second interface. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 A schematic diagram of the structure of a two-stage compression assembly of a medium back pressure compressor provided by an embodiment of the present invention connected in series;

[0021] Figure 2 A schematic diagram of the structure of a two-stage compression assembly of a medium back pressure compressor provided by an embodiment of the present invention connected in parallel;

[0022] Figure 3 A schematic diagram of the structure of a two-stage compression assembly of a high back pressure compressor provided by an embodiment of the present invention connected in series;

[0023] Figure 4 A schematic diagram of the structure of a two-stage compression assembly of a high back pressure compressor provided by an embodiment of the present invention connected in parallel;

[0024] Figure 5 A schematic diagram of the structure of another three-way joint provided by an embodiment of the present invention when two-stage compression assemblies are connected in series;

[0025] Figure 6 A schematic diagram of the structure of another three-way joint provided by an embodiment of the present invention when two-stage compression assemblies are connected in parallel;

[0026] Figure 7 A schematic structural diagram of a compressor when another three-way joint provided in an embodiment of the present invention is located outside the liquid storage chamber.

[0027] The following are marked in the accompanying drawings:

[0028] Shell 1, motor 2, eccentric shaft 3, first compression assembly 4, second compression assembly 5, elastic device 6, third interface 7, liquid reservoir 8, three-way joint 9, first interface 10, second interface 11, main air inlet 12, second switch valve 13, first switch valve 14, main exhaust port 15, liquid storage chamber 16, first connecting pipe 17, second connecting pipe 18, first air inlet pipe 19, second air inlet pipe 20, exhaust pipe 21, valve 91, capillary 92, valve block 93, first closed chamber 94, second closed chamber 95. DETAILED DESCRIPTION

[0029] The embodiment of the present invention discloses a compressor, which effectively solves the problem of short service life of the current compressor.

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] See also Figure 1-Figure 7 , Figure 1 A schematic diagram of the structure of a two-stage compression assembly of a medium back pressure compressor provided by an embodiment of the present invention connected in series; Figure 2 A schematic diagram of the structure of a two-stage compression assembly of a medium back pressure compressor provided by an embodiment of the present invention connected in parallel; Figure 3 A schematic diagram of the structure of a two-stage compression assembly of a high back pressure compressor provided by an embodiment of the present invention connected in series; Figure 4 A schematic diagram of the structure of a two-stage compression assembly of a high back pressure compressor provided by an embodiment of the present invention connected in parallel; Figure 5 A schematic diagram of the structure of another three-way joint provided by an embodiment of the present invention when two-stage compression assemblies are connected in series; Figure 6 A schematic diagram of the structure of another three-way joint provided by an embodiment of the present invention when two-stage compression assemblies are connected in parallel; Figure 7 A schematic structural diagram of a compressor when another three-way joint provided in an embodiment of the present invention is located outside the liquid storage chamber.

[0032] In a specific embodiment, this embodiment provides a compressor, which can be a two-stage compressor or a two-stage compression rotary compressor. Specifically, the compressor can include a first compression assembly 4, a second compression assembly 5 and a liquid storage 8.

[0033] The first compression assembly 4 and the second compression assembly 5 are both compression assemblies, and the compression assembly is to compress the intake air of the air inlet through the rotation of the compression member, and then discharge it from the exhaust port. The specific setting method of the compression assembly can refer to the prior art. The first compression assembly 4 and the second compression assembly 5 can both be driven by a motor 2, that is, the compression member of the first compression assembly 4 and the compression member of the second compression assembly 5 can both be connected to the same motor 2 through the eccentric shaft 3 to transmit power. Of course, the first compression assembly 4 and the second compression assembly 5 can also be driven by a motor respectively. Specifically, the driving form of the two compression assemblies can be set as needed.

[0034] The function of the liquid reservoir 8 is to prevent the gas entering the main air inlet 12 from containing a large number of liquid droplets, thereby affecting the use of the compression assembly. The upper end of the liquid reservoir 8 is provided with a main air inlet 12 connected to the internal liquid storage cavity 16, that is, the gas is introduced into the liquid storage cavity 16 through the main air inlet 12, and the liquid droplets in the gas will settle in the liquid storage cavity 16. The liquid reservoir 8 can be a sealed tank structure, and its specific shape and size can be set as needed.

[0035] The second compression assembly 5 and the first compression assembly 4 can be connected in series, wherein the second compression assembly 5 serves as a first-stage compression assembly, and the first compression assembly 4 serves as a second-stage compression assembly. Correspondingly, the exhaust port of the first compression assembly 4 is connected to the main exhaust port 15, and the exhaust port of the second compression assembly 5 is connected to the air inlet of the first compression assembly 4 through the exhaust passage.

[0036] Moreover, the air inlet of the second compression assembly 5 is connected to the liquid storage chamber 16 through a pipe, and the upper opening of the pipe is arranged higher than the bottom of the liquid storage chamber 16. The upper opening of the pipe allows the gas in the liquid storage chamber 16 to be introduced into the pipe through the upper opening, and then introduced into the air inlet of the second compression assembly 5 through the pipe. The upper opening of the pipe is arranged higher than the bottom of the liquid storage chamber 16, so that the liquid droplets in the gas entering the liquid storage chamber 16 from the main air inlet 12 will not enter the upper opening of the pipe after falling to the bottom of the liquid storage chamber 16. In order to ensure the liquid storage capacity of the liquid storage chamber 16, it is preferred that the upper opening of the pipe is located at the upper part of the liquid storage chamber 16.

[0037] The exhaust channel is provided through the liquid reservoir 8 so that the inner cavity of the exhaust channel can achieve heat exchange with the inner cavity of the liquid reservoir 8, so that the high-temperature gas in the exhaust channel can transfer heat to the liquid storage chamber 16, thereby heating the gas in the liquid storage chamber 16. It should be noted that in order to better increase the intake temperature of the second compression assembly 5, the above-mentioned pipe connected to the second compression assembly 5 can be made to have heat exchange capacity at least in the part located in the liquid reservoir 8, so as to improve the heat exchange efficiency in the channel. It should be noted that the exhaust channel can exchange heat with the gas in the liquid storage chamber 16, and the channel wall of the exhaust channel at least close to the inside of the liquid storage chamber 16 is a heat exchange wall, which can achieve heat conduction.

[0038] In this compressor, when in use, the first compression assembly 4 and the second compression assembly 5 are both started, and then the air inlet of the second compression assembly 5 is sucked into a negative pressure state, so that the gas in the liquid reservoir 8 enters the air inlet of the second compression assembly 5 through the pipeline, and the gas in the liquid reservoir 8 will be replenished through the main air inlet 12, and the second compression assembly 5 compresses the gas and discharges it. The temperature and pressure of the discharged gas are both increased (medium temperature), and then enters the air inlet of the first compression assembly 4 through the exhaust channel, and then is further compressed and heated (high temperature) by the first compression assembly 4. At the same time, when the exhaust channel passes through the liquid reservoir 8, the gas in the liquid reservoir 8 is heated, and the gas in the exhaust channel exchanges heat with the gas in the liquid reservoir 8 and cools down. Therefore, the gas entering the first compression assembly 4 through the exhaust channel is cooled, and the gas in the liquid reservoir 8 entering the second compression assembly 5 is heated, thereby reducing the overall inlet and outlet temperature difference of the compressor, which is beneficial to protecting various components of the compressor. At the same time, it is beneficial to reduce the temperature of the gas discharged from the first compression assembly 4, further protecting the compressor, and effectively reducing energy consumption. In summary, the compressor can effectively extend the service life of the current compressor.

[0039] In order to better realize the function of the compressor, a control assembly is generally provided, wherein the control assembly realizes the switching between the parallel connection and the series connection between the first compression assembly 4 and the second compression assembly 5 through the control component. Specifically, the control assembly includes a three-way joint 9, a valve 91 and an elastic device 6. The three-way joint 9 is connected in series to the exhaust passage, that is, the three-way joint 9 can be connected between the exhaust passage and the air inlet of the first compression assembly 4, can also be connected between the exhaust passage and the exhaust port of the second compression assembly 5, and can also be connected in series in the middle of the exhaust passage.

[0040] The three-way connector 9 has three interconnected interfaces, namely the first interface 10, the second interface 11 and the third interface 7. The first interface 10 is connected to the liquid storage chamber 16 of the liquid reservoir 8 through a pipeline, and the upper end opening of the pipeline is higher than the bottom of the liquid storage chamber 16, so as to be connected with the main air inlet 12 to obtain air from the main air inlet 12. It is only necessary to be able to obtain air from the main air inlet 12, and a one-to-one connection is not required. The upper end opening of the pipeline is higher than the bottom of the liquid storage chamber 16, which can prevent the liquid in the liquid storage chamber 16 from entering the upper end opening of the pipeline.

[0041] The second interface 11 is connected to the exhaust port of the second compression assembly 5 through the second switching valve 13 to obtain exhaust gas from the exhaust port of the second compression assembly 5, and the third interface 7 is connected to the air inlet of the first compression assembly 4, so that the air inlet of the first compression assembly 4 obtains gas from the total air inlet 12 from the first interface 10 through the three-way joint 9 when connected in parallel, and obtains gas from the exhaust port of the second compression assembly 5 from the second interface 11 when connected in series.

[0042] The exhaust port of the second compression assembly 5 is connected to the main exhaust port 15 through the first switch valve 14, so that when connected in parallel, the first switch valve 14 is in an open state, and the second switch valve 13 is in a closed state, so that the exhaust of the second compression assembly 5 is directly discharged to the main exhaust port 15; and when connected in series, the first switch valve 14 is in a closed state, and the second switch valve 13 is in an open state, so that the exhaust of the second compression assembly 5 is no longer directly discharged to the main exhaust port 15, but is discharged to the air inlet of the first compression assembly 4 through the three-way joint 9. It should be noted that the first switch valve 14 and the second switch valve 13 can be linkage valves, so that through the linkage system, when any one of them switches from the open state to the closed state, the other correspondingly switches from the closed state to the open state. Specifically, the first switch valve 14 and the second switch valve 13 can both be solenoid valves, and the linkage is realized between them through the power system. Of course, the two switch valves can also be manual valves.

[0043] The valve 91 is used to close or open the first interface 10, that is, when the valve 91 is opened, the first interface 10 is in a connected state with the third interface 7, so that the gas from the total air inlet 12 can be introduced into the air inlet of the first compression component 4; when the valve 91 is closed, the first interface 10 is closed and is no longer in a connected state with the third interface 7.

[0044] The elastic device 6 is used to push the valve 91 to move, that is, the elastic device 6 forms a driving force through elastic deformation, thereby pushing the valve 91 to move in the opening or closing direction, so that the first interface 10 is closed or opened. When the external force overcomes the elastic deformation force of the elastic device 6, the elastic device 6 continues to deform elastically, thereby moving the valve 91 in the other direction of opening or closing, so that the first interface 10 is closed or opened. The elastic device is generally a compression spring, and of course it can also be a tension spring, or other elastic body.

[0045] Specifically, the valve 91 is opened and closed by the pressure difference force formed by the opening and closing of the second switch valve 13, that is, the pressure difference formed by the opening of the second switch valve 13 forms a pressure difference force to push the valve 91 to move to close, or the pressure difference formed by the closing of the second switch valve 13 forms a pressure difference force to push the valve 91 to move to open, so that the first interface 10 is connected to the third interface 7.

[0046] Moreover, the pressure difference force formed by the opening and closing of the second switch valve 13 is opposite to the driving force of the elastic device 6, and the driving force of the elastic device 6 and the pressure difference force formed by the opening and closing of the second switch valve 13 cooperate with each other, so that the valve 91 is closed when the second switch valve 13 is opened, and the valve 91 is opened when the second switch valve 13 is closed.

[0047] Specifically, when the second switch valve 13 is opened and forms a pressure differential force that drives the valve 91 to close, the driving force of the elastic device 6 is used to drive the valve 91 to open, and the pressure differential force formed at this time can overcome the elastic deformation force of the elastic device 6; and when the second switch valve 13 is closed and forms a pressure differential force that drives the valve 91 to open, the driving force of the elastic device 6 is used to drive the valve 91 to close, and the pressure differential force formed at this time can overcome the elastic deformation force.

[0048] In application, if parallel connection is required, the first switch valve 14 is opened by operating the first switch valve 14, and the second switch valve 13 is closed. At this time, under the cooperation of the pressure difference force formed by the closing of the second switch valve 13 and the driving force of the elastic device 6, the valve 91 is opened, and the first compression assembly 4 is fed from the main air inlet 12 through the three-way joint 9, thereby realizing the parallel connection of the first compression assembly 4 and the second compression assembly 5. When series connection is required, the second switch valve 13 is opened by operating the first switch valve 14, and the first switch valve 14 is closed. At this time, under the cooperation of the pressure difference force formed by the opening of the second switch valve 13 and the driving force of the elastic device 6, the valve 91 is closed, and the air inlet of the first compression assembly 4 is no longer fed from the main air inlet 12, but from the exhaust port of the first compression assembly 5, thereby realizing series connection. In this compressor, the pressure difference change formed by the opening and closing of the second switch valve 13 and the deformation force of the elastic device 6 are utilized, so that when the second switch valve 13 is opened and closed, the intake adjustment of the first compression component 4 can be automatically achieved, thereby eliminating the need for separate valve control, making the control convenient, simple, fast and reliable.

[0049] As described above, there are various positional relationships between the exhaust channel and the three-way joint 9. For example, the exhaust pipe 21 may be further provided as the exhaust channel, wherein the three-way joint 9 is located at the lower end of the liquid reservoir 8 and outside the liquid reservoir 8, and wherein the exhaust pipe 21 penetrates into the liquid reservoir 8 along the vertical direction, and the two ends are respectively connected to the second switch valve 13 and the second interface 11.

[0050] At this time, the first interface 10 and the air inlet of the second compression assembly 5 can be respectively provided with pipes to extend into the liquid storage chamber 16. Specifically, the first interface 10 can be connected to a first air inlet pipe 19 extending into the liquid storage chamber 16, and the air inlet of the second compression assembly 5 can be connected to a second air inlet pipe 20 extending into the liquid storage chamber 16, and the pipe opening of the first air inlet pipe 19 and the pipe opening of the second air inlet pipe 20 are arranged at the same height, so that the suction state of the two cylinders is highly consistent during single-stage compression, which is conducive to stable operation and performance.

[0051] The first interface 10 and the air inlet of the second compression assembly 5 may also share a pipe extending into the liquid storage chamber 16. Specifically, a main air inlet pipe extending into the liquid storage chamber 16 may be provided, and the main air inlet pipe, the first interface 10 and the air inlet of the second compression assembly 5 are interconnected through a three-way structure.

[0052] The three-way joint 9 can also be located in the liquid storage chamber 16 of the liquid reservoir. When the three-way joint 9 is located in the liquid storage chamber 16 of the liquid reservoir, since the liquid storage chamber 16 is a low-pressure environment, if there is a gap in the three-way joint 9 that is not tightly connected, the gas in the three-way joint 9 will directly enter the liquid storage chamber 16 instead of flowing into the external environment, so as to achieve a better sealing effect and make the structure of the three-way joint 9 simpler. Specifically, correspondingly, the compressor includes a first connecting pipe 17 and a second connecting pipe 18, wherein the pipe of the first connecting pipe 17 and the pipe of the second connecting pipe 18 are both the exhaust channels, so as to form the above-mentioned exhaust channels in combination. The three-way joint 9 is located in the liquid storage chamber 16 of the liquid reservoir, the first connecting pipe 17 penetrates into the liquid reservoir 8 from the top of the liquid reservoir 8 and the two ends are respectively connected to the second interface 11 and the second switch valve 13, and the second connecting pipe 18 penetrates into the liquid reservoir 8 from the bottom of the liquid reservoir 8 and the two ends are respectively connected to the third interface 7 and the air inlet of the first compression assembly 4.

[0053] At this time, the first interface 10 can be connected to a first air inlet pipe 19 connected to the liquid storage chamber 16, the air inlet of the second compression assembly 5 can be connected to a second air inlet pipe 20 extending into the liquid storage chamber 16, and the air inlet opening of the first air inlet pipe 19 and the air inlet opening of the second air inlet pipe 20 are arranged at the same height. Further, considering the reason that the joint is prone to water leakage, it is preferred that the three-way joint 9 is located at the upper part of the liquid storage chamber 16.

[0054] The air inlet of the first interface 10 and the second compression assembly 5 are both connected to the liquid storage chamber 16 through a pipe, and the upper opening of the pipe is higher than the bottom of the liquid storage chamber 16. The upper opening of the pipe is preferably arranged upward, and is preferably staggered with the main air inlet 12. The upper opening of the pipe is arranged higher than the bottom of the chamber to prevent the liquid in the liquid storage chamber 16 from entering the pipe.

[0055] As described above, the valve 91 is closed by the pressure difference force formed by the opening and closing of the second switch valve 13 and the deformation force of the elastic device 6. A specific solution can make the driving force of the elastic device 6 used to drive the valve 91 to close, and the air pressure difference formed by the closing of the second switch valve 13 can push the valve 91 to open. Specifically, when the second switch valve 13 is closed, the air inlet of the first compression assembly 4 is in a suction state, so that the air pressure in the three-way joint 9 drops significantly, or even presents a negative pressure state, and at this time, the gas coming in from the total air inlet 12 will form an air pressure difference with the gas in the three-way joint 9, and the air pressure difference can overcome the elastic deformation force of the elastic device 6 to push the valve 91 to open. When the second switch valve 13 is opened, the medium and high pressure gas discharged from the second compression assembly 5 will enter the inner cavity of the three-way joint 9 through the opened second switch valve 13, so that the air pressure in the three-way joint 9 rises rapidly to exceed the air pressure in the total air inlet 12. At this time, the elastic device 6 can drive the valve 91 to close to close the first interface 10.

[0056] The arrangement of the valve 91 can meet the above requirements. Specifically, the valve 91 can be located in the first interface 10, with one side facing the entrance of the first interface 10 and the other side connected to the elastic device 6, wherein the elastic device 6 is a compression spring and the two ends are respectively against the inner cavity wall of the valve 91 and the three-way joint 9, so as to push the valve 91 to close the first interface 10 through the compression spring. Specifically, the three-way joint 9 can include a crossbar cavity, wherein the first interface 10 and the second interface 11 are respectively connected to the two ends of the crossbar cavity, and the third interface 7 is connected to the middle of the crossbar cavity. The valve 91 and the elastic device 6 are both arranged in the crossbar cavity.

[0057] Another specific scheme can make the valve 91 slide and cooperate with the inner cavity of the three-way joint 9, wherein one end of the three-way joint 9 is provided with a first closed cavity 94, and the above-mentioned elastic device 6 is provided inside the first closed cavity 94, and the other end of the three-way joint 9 has a second closed cavity 95, and the second closed cavity 95 is connected with the second interface 11 through a capillary 92, so that the gas pressure in the second interface 11 is transmitted to the second closed cavity 95 through the capillary 92, so that when the second switch valve 13 is opened, the medium and high pressure gas in the second interface 11 enters the second closed cavity 95 through the capillary 92, and at this time, the air pressure in the second closed cavity 95 is greater than the air pressure in the first closed cavity 94, and the pressure difference between them can also overcome the elastic deformation force of the elastic device 6, so that the valve 91 is pushed to slide to close the first interface 10 and compress and deform the elastic device 6, and when the second switch valve 13 is closed, the air pressure in the second closed cavity 95 is reduced, so that the elastic device 6 pushes the valve 91 to slide in the opposite direction to open the first interface 10.

[0058] Furthermore, the three-way connector 9 may include a middle transverse cavity, and the two ends of the middle transverse cavity are respectively provided with a first closed cavity 94 and a second closed cavity 95, the first interface 10 is provided in the middle of the middle transverse cavity near the second closed cavity 95, the second interface 11 is provided near the first closed cavity 94, and the third interface 7 is provided between the first interface 10 and the second interface 11. Specifically, the first interface 10 and the second interface 11 may be both provided on the upper side of the middle transverse cavity, and the third interface 7 is provided on the lower side of the middle transverse cavity. It also includes a valve block 93 provided at the first closed cavity 94 for blocking the second interface 11, wherein the valve 91 is provided at the second closed cavity 95, and the valve block 93 is connected to the valve 91 through a connecting rod, and the elastic device 6 abuts against the side of the valve block 93 away from the valve 91. The distance between the valve 91 and the valve block 93 is greater than the distance between the first interface 10 and the second interface 11, so that when the valve 91 closes the first interface 10, the valve block 93 is in an open position, and when the valve 91 moves to an open state, the corresponding valve block 93 is in a closed position. Specifically, the middle transverse cavity can be a cylindrical cavity, and the valve block 93 and the valve 91 are both cylindrical and slidably cooperate with the middle transverse cavity.

[0059] For the compressor, the motor 2 is generally arranged inside the shell 1 for better protection, and the exhaust of the first compression component or the second compression component is discharged into the shell. Specifically, the exhaust channel of the first compression component 4 or the exhaust channel of the second compression component 5 can be set through the shell 1. There are mainly two ways to set the exhaust channel through the shell 1. One is to use the shell cavity as a part of the exhaust channel, that is, the gas at the inlet end of the exhaust channel will enter the shell 1, and then be discharged from the exhaust port of the shell 1. An exhaust pipe can be set at the upper end of the shell 1, and the tube cavity of the exhaust pipe is used as a part of the exhaust channel, that is, when the exhaust channel of the first compression component 4 passes through the shell 1, the compressor is a high back pressure compressor at this time, and the upper end exhaust pipe is connected to the main exhaust port 15 at this time, and when the exhaust channel of the second compression component 5 passes through the shell 1, the compressor is a medium back pressure compressor at this time, and the exhaust pipe is connected to one end interface of the first switch valve 14 and the interface of the second switch valve 13 through a three-way port.

[0060] When two compression assemblies share one motor 2, the eccentric shaft 3 is connected to the main shaft of the motor 2, and the first compression assembly 4 and the second compression assembly 5 are both sleeved and connected to the eccentric shaft 3, wherein the first compression assembly 4 is arranged between the second compression assembly 5 and the motor 2, and generally the first compression assembly 4 is arranged on the upper side of the second compression assembly 5. When connected in series, the first compression assembly 4 is used as a secondary compression assembly and is arranged close to the motor 2, which is beneficial to the load distribution of the eccentric shaft 3 to ensure the service life of the eccentric shaft 3.

[0061] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0062] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A compressor, characterized in that: The invention comprises a first compression assembly (4), a second compression assembly (5) and a liquid reservoir (8), wherein the upper end of the liquid reservoir (8) is provided with a total air inlet (12) communicating with a liquid storage cavity (16) inside the liquid reservoir (8), the air inlet of the second compression assembly (5) is connected to the liquid storage cavity (16) through a pipeline, and the upper end opening of the pipeline is higher than the cavity bottom of the liquid storage cavity (16), the exhaust port of the first compression assembly (4) is connected with the total exhaust port (15), the exhaust port of the second compression assembly (5) is connected with the air inlet of the first compression assembly (4) through an exhaust channel, the exhaust channel is arranged through the liquid reservoir (8), and the inner cavity of the exhaust channel can achieve heat exchange with the inner cavity of the liquid reservoir (8); and the invention also comprises a three-way joint (9), a valve (91) for closing the first interface (10) of the three-way joint (9), and an elastic device (6) for pushing the valve (91) to move, the exhaust port of the second compression assembly (5) The valve (91) is connected to the main exhaust port via a first switch valve (14) and to the exhaust passage via a second switch valve (13). The three-way joint (9) is connected in series to the exhaust passage so that the second interface (11) of the three-way joint (9) is connected to the exhaust port of the second compression assembly (5) via the second switch valve (13). The air inlet of the first compression assembly (4) is connected to the third interface (7) of the three-way joint (9). The first interface (10) is connected to the liquid storage chamber via a pipeline, and the upper end opening of the pipeline is higher than the bottom of the chamber. The valve (91) is opened and closed by a pressure difference force opposite to the driving force of the elastic device (6) formed by the opening and closing of the second switch valve (13). When the second switch valve (13) is opened, the valve (91) is closed, and when the second switch valve (13) is closed, the valve (91) is opened. The first compression assembly and the second compression assembly are driven by the same motor.

2. The compressor according to claim 1, characterized in that The exhaust pipe (21) is also included, the pipeline being an exhaust pipe (21) of the exhaust channel, the three-way joint (9) being located at the lower end of the liquid reservoir (8) and outside the liquid reservoir (8), the exhaust pipe (21) penetrating into the liquid reservoir (8) in a vertical direction, and the two ends of the exhaust pipe are respectively connected to the second switch valve (13) and the second interface (11).

3. The compressor according to claim 1, characterized in that The first interface (10) is connected to a first air intake pipe (19) extending into the liquid storage chamber (16); the air intake port of the second compression assembly (5) is connected to a second air intake pipe (20) extending into the liquid storage chamber; the air intake port of the first air intake pipe (19) and the air intake port of the second air intake pipe (20) are arranged at the same height.

4. The compressor according to claim 1, characterized in that The invention comprises a first connecting pipe (17) and a second connecting pipe (18), wherein the inner cavity of the pipe of the first connecting pipe (17) and the inner cavity of the pipe of the second connecting pipe (18) are both the exhaust passages, the three-way joint (9) is located in the liquid storage cavity of the liquid reservoir, the first connecting pipe (17) penetrates into the liquid reservoir (8) from the top and the two ends are respectively connected to the second interface (11) and the second switch valve (13), the second connecting pipe (18) penetrates into the liquid reservoir (8) from the bottom and the two ends are respectively connected to the third interface (7) and the air inlet of the first compression assembly (4).

5. The compressor according to claim 4, characterized in that The three-way connector (9) is located at the upper part of the liquid storage chamber (16).

6. The compressor according to any one of claims 1 to 5, characterized in that: The driving force of the elastic device (6) is used to drive the valve (91) to close, and when the second switch valve (13) is closed, the pressure difference formed by the gas pressure entering the main air inlet (12) and the gas pressure in the three-way connector (9) can overcome the elastic deformation force of the elastic device (6) to push the valve (91) to open.

7. The compressor according to claim 6, characterized in that The valve (91) is located in the first interface (10), with one side facing the inlet of the first interface (10) and the other side connected to the elastic device (6); the elastic device (6) is a compression spring and the two ends of the elastic device (6) are respectively against the inner cavity wall of the valve (91) and the three-way connector (9).

8. The compressor according to any one of claims 1 to 5, characterized in that: The valve (91) is slidably matched with the inner cavity of the three-way connector (9); a first closed cavity (94) is provided at one end of the three-way connector (9), and the elastic device (6) is provided inside the first closed cavity (94); the other end of the three-way connector (9) has a second closed cavity (95), and the second closed cavity (95) is connected to the second interface (11) through a capillary tube (92), so that when the second switch valve (13) is opened, the valve (91) is pushed to slide to close the first interface (10) and the elastic device (6) is compressed and deformed; when the second switch valve (13) is closed, the elastic device (6) pushes the valve (91) to slide in the opposite direction to open the first interface (10).

9. The compressor according to claim 8, characterized in that The three-way connector (9) further comprises: a middle transverse cavity portion, wherein the first closed cavity (94) and the second closed cavity (95) are respectively arranged at two ends of the middle transverse cavity portion, the first interface (10) is arranged in the middle portion of the middle transverse cavity portion close to the second closed cavity (95), the second interface (11) is arranged close to the first closed cavity (94), and the third interface (7) is arranged between the first interface (10) and the second interface (11); A valve block (93) is arranged at the first closed cavity (94) for sealing the second interface (11); the valve (91) is arranged at the second closed cavity (95); the valve block (93) and the valve (91) are connected via a connecting rod; the elastic device (6) abuts against a side of the valve block (93) away from the valve (91); and the distance between the valve (91) and the valve block (93) is greater than the distance between the first interface (10) and the second interface (11).

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