Enthalpy-increasing compressor and air conditioning system

Abstract

The utility model discloses an enthalpy-increasing compressor and an air conditioning system. The enthalpy-increasing compressor comprises a compression cavity and an enthalpy-increasing pipe connected with the compression cavity, and further comprises a valve plate, one side edge of the valve plate is fixedly connected with the inner wall of the enthalpy-increasing pipe, and the other opposite side edge of the valve plate can swing; the limiting valve is arranged on the inner wall of the enthalpy increasing pipe corresponding to the swingable side edge of the valve plate and can move back and forth towards or away from the valve plate, and when the limiting valve is connected with the swingable side edge of the valve plate, the valve plate is limited to swing in the direction away from the enthalpy increasing opening; and the driving device drives the limiting valve to move. The enthalpy increasing pipe of the enthalpy increasing compressor not only can be used for increasing enthalpy, but also can be used for relieving pressure.

Description

Technical Field

[0001] The utility model relates to the technical field of air source heat pump systems, in particular to an economized compressor for preventing liquid slugging and an air-conditioning system. Background Art

[0002] The economized compressor is an important solution for air-conditioning systems to cope with the operation challenges under extremely cold conditions. Compared with traditional compressors, the economized compressor improves the operation efficiency and stability of the system at low temperatures through staged compression and intermediate liquid injection technologies. The so-called intermediate liquid injection technology refers to injecting part of the liquid refrigerant into the suction side of the compressor, allowing it to evaporate during the compression process, thereby increasing the enthalpy value of the refrigerant, reducing the compression workload, lowering the working temperature, and improving the refrigeration efficiency.

[0003] Generally, economized compressors are equipped with economizer tubes. Currently, the refrigerant flow direction of the economizer tubes is single, and it can only flow towards the compression chamber, with relatively single functions.

[0004] Furthermore, the application scope of air source heat pump household water chillers is gradually expanding to cold regions in the north. In extremely cold regions, in order to prevent the water system from freezing in low-temperature environments, a split installation is mostly adopted, and the hot water generator (including the water system heat exchanger and water circuit components) is placed indoors.

[0005] In split systems, plate heat exchangers are widely used due to their small volume and high heat transfer efficiency. However, compared with traditional finned heat exchangers, the volume of plate heat exchangers is significantly smaller, resulting in a large difference in the refrigerant filling volume required for the system during the refrigeration and heating cycles. Usually, a liquid storage tank is used to store the excess refrigerant, but during ultra-low temperature startup or defrost operation, the compressor still faces the risk of liquid slugging, affecting the reliable operation of the equipment.

[0006] In addition, refrigerant leakage may occur during the installation and commissioning of split systems, and it is often necessary to refill the refrigerant on-site. Conventional systems need to refill the refrigerant through the outdoor unit, but this is inconvenient for on-site operation. At the same time, the refrigerant filling volume of heat pump household water chillers is large, and the compressor needs to establish a system pressure difference to refill the refrigerant smoothly from the low-pressure side. However, when refilling the refrigerant through the indoor unit, due to the small volume of the plate heat exchanger, the compressor is more likely to experience liquid slugging.

[0007] Therefore, how to provide an economized compressor that can both increase enthalpy and relieve pressure is a technical problem to be solved. Subsequently, on the basis of solving this technical problem, further reduce the liquid slugging risk of the air-conditioning system. Content of the Utility Model

[0008] In order to solve the technical problem in the prior art that the enthalpy increasing pipe of the enthalpy increasing compressor can only be used to increase enthalpy and has a single function, the utility model proposes an enthalpy increasing compressor and an air conditioning system.

[0009] The enthalpy-increasing compressor proposed in the present invention includes a compression chamber, an enthalpy-increasing pipe connected to the compression chamber, and further includes:

[0010] A valve plate, one side of which is fixedly connected to the inner wall of the enthalpy increasing tube and the other side of which is opposite and can swing;

[0011] a limit valve, disposed on the inner wall of the enthalpy increasing pipe corresponding to one side of the valve disc that can swing, and capable of moving back and forth toward or away from the valve disc, and when the limit valve is connected to one side of the valve disc that can swing, limiting the valve disc from swinging in a direction away from the enthalpy increasing port;

[0012] A driving device drives the limit valve to move.

[0013] Furthermore, the limit valve is made of ferromagnetic material, or made of metal that can be attracted by magnetic material, and the driving device includes:

[0014] at least one elastic member, one end of which is fixedly connected and the other end of which is connected to the limit valve, and is used to drive the limit valve to move away from the valve plate;

[0015] At least one set of coils, when energized, drives the limit valve to move toward the valve plate.

[0016] Furthermore, the driving device is an electric telescopic rod.

[0017] Furthermore, the limit valve passes through the enthalpy increasing tube, and the driving device is arranged outside the enthalpy increasing tube.

[0018] Furthermore, the limit valve is movably and hermetically connected to the enthalpy increasing tube, or a sealing cover covering the limit valve is provided outside the enthalpy increasing tube.

[0019] Furthermore, the valve plate is made of stainless steel.

[0020] The air-conditioning system proposed in the present invention comprises a compressor, an outdoor heat exchanger and a terminal heat exchanger, wherein the compressor is the enthalpy-increasing compressor described in the above technical solution.

[0021] Furthermore, the air-conditioning system is a heat pump system, a first electronic expansion valve and a second electronic expansion valve are provided between the outdoor heat exchanger and the terminal heat exchanger, a steam recovery heat exchanger is provided between the first electronic expansion valve and the second electronic expansion valve, and the enthalpy increase pipe of the enthalpy increase compressor is respectively connected to the steam recovery heat exchanger and the four-way valve through a pipe-valve assembly.

[0022] Further, the tube valve assembly includes: a first pipeline connected to the enthalpy-increasing tube, a second pipeline with one end connected to the first pipeline and the other end connected to the four-way valve, a third pipeline with one end connected to the first pipeline and the other end connected to the steam recovery heat exchanger, a one-way valve and a first stop valve provided on the second pipeline, and a second stop valve provided on the third pipeline.

[0023] Further, the steam recovery heat exchanger is a flash tank or an economizer.

[0024] The present utility model has made structural improvements to the enthalpy-increasing tube part of the enthalpy-increasing compressor, enabling the enthalpy-increasing tube of the enthalpy-increasing compressor to be used for enthalpy increase when enthalpy increase is required and for pressure relief when pressure relief is required, providing convenient hardware conditions for the anti-liquid-hammer control of the air-conditioning system. The air-conditioning system of the present invention further cooperates with the enthalpy-increasing compressor through a tube valve structure, so that the air-conditioning system can cooperate with corresponding controls to achieve the anti-liquid-hammer function. Description of the Drawings

[0025] The following will describe the present utility model in detail with reference to the embodiments and the drawings, where:

[0026] Figure 1 is the first state of the partial structure schematic diagram of the compressor according to an embodiment of the present utility model.

[0027] Figure 2 is the second state of the partial structure schematic diagram of the compressor according to an embodiment of the present utility model.

[0028] Figure 3 is the schematic diagram of the pressure relief principle of the enthalpy-increasing compressor of the present utility model.

[0029] Figure 4 is the schematic diagram of the principle of closing the pressure relief function of the enthalpy-increasing compressor of the present utility model.

[0030] Figure 5 is the schematic diagram of the structure of the air-conditioning system according to an embodiment of the present utility model.

[0031] Figure 6 is the schematic diagram of the refrigerant flow direction during refrigerant filling according to an embodiment of the present utility model.

[0032] Figure 7 is the schematic diagram of the refrigerant flow direction during heating according to an embodiment of the present utility model.

[0033] Description of the Reference Numerals:

[0034] 1. Enthalpy-increasing compressor; 2. Four-way valve; 3. Finned heat exchanger; 4. Finned heat exchanger fan; 5. First electronic expansion valve; 6. Second electronic expansion valve; 7. Flash tank; 8. Small valve; 9. Connector; 10. Refrigerant filling port; 11. Water-side heat exchanger; 12. Water pump; 13. Large valve; 14. Gas-liquid separator; 15. Second stop valve; 16. First stop valve; 17. Check valve.

[0035] 101. Compression chamber; 102. Enthalpy-increasing pipe; 103. Valve plate; 104. Limit valve; 105. Coil. Detailed implementation manners

[0036] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present utility model clearer and more understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0037] Therefore, a feature pointed out in this specification will be used to illustrate one feature of one embodiment of the present utility model, rather than implying that each embodiment of the present utility model must have the illustrated feature. In addition, it should be noted that this specification describes many features. Although some features can be combined together to show possible system designs, these features can also be used in other combinations not explicitly described. Therefore, unless otherwise stated, the illustrated combinations are not intended to be limiting.

[0038] Aiming at the problem that the existing enthalpy-increasing compressor can only achieve the enthalpy-increasing effect, the steam flow direction in the enthalpy-increasing pipe can only be from the enthalpy-increasing pipe to the compression chamber of the compressor, and it cannot be depressurized when needed, so that the refrigerant cannot flow from the compression chamber of the compressor to the enthalpy-increasing pipe when needed, the enthalpy-increasing compressor proposed by the present invention has the following structure.

[0039] In one embodiment, the enthalpy-increasing compressor includes a compression chamber 101, an enthalpy-increasing pipe 102, a valve plate 103, a limit valve 104 and a driving device.

[0040] The enthalpy-increasing pipe 102 is connected to the compression chamber 101. When the enthalpy-increasing compressor is applied in a refrigeration system or a heat pump system, the enthalpy-increasing pipe 102 can not only be used for enthalpy increase, but also for pressure relief. This is mainly achieved through the cooperation of the valve plate 103 and the limit valve 104.

[0041] The valve plate 103 has two opposite side edges. One side edge is fixedly connected to the inner wall of the enthalpy-increasing pipe 102, and the opposite side edge can swing. When the enthalpy-increasing function is normally realized, under the push of the recycled refrigerant, the swingable side edge of the valve plate 103 swings towards the enthalpy-increasing port, so that the recycled refrigerant can enter the compression chamber 101 through the enthalpy-increasing pipe 102. When the compressor needs to relieve pressure, the swingable side edge of the valve plate 103 swings towards the direction away from the enthalpy-increasing port, and the refrigerant in the compression chamber 101 can be relieved through the enthalpy-increasing pipe 102.

[0042] The present invention does not limit the shape of the cross-section of the enthalpy-increasing pipe perpendicular to the pipe length. If the cross-section of the enthalpy-increasing pipe is circular, then the distinction between the two opposite side edges of the valve plate is not so obvious. A part of the circular edge of the valve plate is fixedly connected to the inner wall of the enthalpy-increasing pipe, and a part of the swingable circular edge can be the opposite side of this part, which does not affect the implementation of the present invention nor limit the protection scope of the present invention.

[0043] The limiting valve is arranged on the inner wall of the enthalpy-increasing pipe corresponding to the swingable side edge of the valve plate. The limiting valve is used to limit the swing of the valve plate towards the direction away from the enthalpy-increasing port. When the limiting valve is connected to the swingable side edge of the valve plate, it limits the swing of the valve plate towards the direction away from the enthalpy-increasing port, which means that the gaseous refrigerant in the compression chamber cannot enter the deep part of the enthalpy-increasing pipe through the valve plate, but the gaseous refrigerant can enter the compression chamber from the enthalpy-increasing pipe through the valve plate to realize the enthalpy-increasing function.

[0044] The driving device is used to drive the limiting valve to move towards or away from the swingable side edge of the valve plate.

[0045] Through the above structure, the enthalpy-increasing pipe of the enthalpy-increasing compressor of the present utility model not only realizes the enthalpy-increasing function, but also can relieve pressure when the compression chamber needs to relieve pressure. In a severe cold environment, the enthalpy-increasing compressor can improve the flow rate of the refrigerant cycle and the accuracy of temperature control, and reduce the risk of liquid refrigerant staying in the system.

[0046] In one embodiment, the limiting valve is made of a ferromagnetic material, such as a magnet. Alternatively, the limiting valve can also be made of a metal that can be attracted by a magnetic material, such as iron, cobalt or nickel, etc.

[0047] The driving device includes an elastic member and a coil.

[0048] One or more elastic members can be provided and connected to the limiting valve. One end of each elastic member is fixedly connected, and the other end is connected to the limiting valve.

[0049] Whether the elastic member is stretched and reset or compressed and reset depends on the cooperation relationship between the coil and the limiting valve.

[0050] When the limit valve uses a magnet, when the coil is energized, the coil and the magnetic limit valve repel each other with the same polarity, driving the limit valve to move towards the valve plate. Then when the coil is de-energized, the limit valve is compressed and reset. That is to say, the elastic member is used to drive the limit valve to move away from the valve plate.

[0051] When the limit valve is made of a material such as iron, when the coil is energized, it generates magnetism to attract the limit valve and move in the direction away from the valve plate. Then when the coil is de-energized, the elastic member extends and resets, driving the limit valve to move in the direction of the valve plate.

[0052] In different embodiments, the elastic member can be a spring or other elastic devices that can extend or compress.

[0053] The drive device of the above embodiment has a relatively low cost and is easy to control.

[0054] In another embodiment, the drive device is an electric telescopic rod. The limit valve can also be controlled to move towards the valve plate or to move away from the valve plate through the electric telescopic rod. Comparatively speaking, using an electric telescopic rod has a relatively higher cost, but it can be used immediately without corresponding structural design.

[0055] In one embodiment, the limit valve penetrates the enthalpy-increasing pipe, and the drive device is arranged outside the enthalpy-increasing pipe. This structure can be improved on the existing enthalpy-increasing compressor, and the modification of the components existing in the enthalpy-increasing compressor itself is relatively small.

[0056] Based on the previous embodiment, since the limit valve penetrates the enthalpy-increasing pipe, the sealing problem between the limit valve and the enthalpy-increasing pipe needs to be considered. In one embodiment, the limit valve can be movably and sealingly connected to the enthalpy-increasing pipe. For example, a sealing ring is arranged in the through hole of the enthalpy-increasing pipe. In another embodiment, a sealing cover covering the limit valve can also be arranged outside the enthalpy-increasing pipe. Of course, a sealing ring can also be arranged in the enthalpy-increasing pipe and a sealing cover can be further arranged, both of which can play an effective sealing role.

[0057] Since the valve plate of the present utility model needs to swing, the valve plate can be made of a material with a certain flexibility. In one embodiment, the valve plate is made of stainless steel, which has a relatively low cost and a certain toughness. In other embodiments, the valve plate can also be made of other similar flexible materials.

[0058] Figure 1 、 Figure 2 The partial structural schematic diagram of the enthalpy-increasing compressor according to an embodiment of the present utility model is shown.

[0059] Figure 1It is a schematic diagram of the enthalpy-increasing state of the enthalpy-increasing pipe. The limiting valve moves towards the valve plate under the action of a spring or a coil. Therefore, the movement of the valve plate towards the direction away from the enthalpy-increasing port is restricted. However, the valve plate can swing towards the enthalpy-increasing port. When pushed by the refrigerant, a gap appears between the valve plate and the limiting valve, allowing the refrigerant to enter the compression chamber through the enthalpy-increasing pipe.

[0060] Figure 2 It is a schematic diagram of the pressure-relief state of the enthalpy-increasing pipe. The limiting valve is separated from the valve plate, so the valve plate can swing towards the direction away from the enthalpy-increasing port. At this time, if pressure relief is required, under the action of high-pressure refrigerant, the valve plate is pushed to swing towards the direction away from the enthalpy-increasing port, so that the enthalpy-increasing compressor can relieve pressure through the enthalpy-increasing pipe when needed. Figure 3 and Figure 4 The figure shows the schematic diagram of the enthalpy-increasing compressor. Figure 3 It shows the pressure-relief state in which the enthalpy-increasing compressor relieves pressure through the enthalpy-increasing pipe. Figure 4 It is a schematic diagram of the state in which the enthalpy-increasing compressor cannot relieve pressure.

[0061] In other embodiments, the structure of the enthalpy-increasing pipe can also be improved to better cooperate with the installation of the limiting valve and the driving device, and at the same time achieve the sealing performance.

[0062] Based on the enthalpy-increasing compressor in the above technical solution, the present utility model also protects the corresponding air-conditioning system. The air-conditioning system includes a compressor, a four-way valve, an outdoor heat exchanger, and a terminal heat exchanger, and the compressor used in this air-conditioning system is the enthalpy-increasing compressor of the above technical solution.

[0063] The introduction of the enthalpy-increasing compressor can not only stabilize the temperature in the vacuum system or the heat pump cycle, but also effectively control the energy balance during the defrosting operation and reduce the possibility of liquid slugging. Through reasonable refrigerant management and multi-stage compression process, it can reduce the compressor load during system startup and further improve the reliability of the equipment.

[0064] When the air conditioner is a heat pump system, a first electronic expansion valve and a second electronic expansion valve are provided between the outdoor heat exchanger and the terminal heat exchanger, a steam recovery heat exchanger is provided between the first electronic expansion valve and the second electronic expansion valve, and the enthalpy-increasing pipe of the enthalpy-increasing compressor is connected to the steam recovery heat exchanger and the four-way valve respectively through a pipe valve assembly.

[0065] Through the control of the corresponding pipelines and valves, the enthalpy-increasing compressor can not only increase enthalpy through the enthalpy-increasing pipe, but also relieve pressure in time through the enthalpy-increasing pipe. In some special occasions, if a single-cooling system also needs to realize the multi-purpose of the enthalpy-increasing pipe, the corresponding pipe valve settings can also be made to realize the multi-purpose of the enthalpy-increasing pipe.

[0066] In one embodiment, the pipe valve assembly includes: a first pipeline, a second pipeline, and a third pipeline, as well as a first stop valve, a second stop valve, and a check valve.

[0067] One end of the first pipeline is connected to the enthalpy-increasing pipe, and the other end is respectively connected to the second pipeline and the third pipeline.

[0068] One end of the second pipeline is connected to the first pipeline, and the other end is connected to the four-way valve.

[0069] One end of the third pipeline is connected to the first pipeline, and the other end is connected to the steam recovery heat exchanger.

[0070] The first stop valve and the check valve are arranged on the second pipeline.

[0071] The second stop valve is arranged on the third pipeline.

[0072] The above pipeline-valve assembly is simple and can realize the enthalpy-increasing regulation and pressure-relief regulation of the air-conditioning system.

[0073] In one embodiment, the steam recovery heat exchanger of the present utility model can be a flash tank or an economizer. Taking the flash tank as an example, the flash tank can adjust the liquid pressure entering the flash tank, so that after the high-temperature and high-pressure liquid enters the flash tank, since the temperature is higher than the boiling point at this pressure, the liquid starts to vaporize to reach the gas-liquid equilibrium at this pressure. The flash tank is mainly to cooperate with the enthalpy-increasing function of the enthalpy-increasing compressor.

[0074] Figure 5 The structural schematic diagram of an air-conditioning system is shown. This air-conditioning system is an air-source heat pump enthalpy-increasing system.

[0075] This air-source heat pump enthalpy-increasing system includes: an enthalpy-increasing compressor 1, a four-way valve 2 connected to the enthalpy-increasing compressor 1, a fin heat exchanger 3 serving as an outdoor heat exchanger, a fin heat exchanger fan 4 on the fin heat exchanger 3, and a water-side heat exchanger 11 serving as an end heat exchanger. The water-side heat exchanger is a plate heat exchanger.

[0076] A first electronic expansion valve 5, a flash tank 7, a second electronic expansion valve 6, a small valve 8 and a joint 9 connected between the fin heat exchanger 3 and the water-side heat exchanger 11. There is a refrigerant filling port 10 between the joint 9 and the water-side heat exchanger.

[0077] There is also a joint 9 and a large valve 13 between the water-side heat exchanger 11 and the four-way valve 2.

[0078] One path of the enthalpy-increasing pipe of the enthalpy-increasing compressor 1 is connected to the flash tank 7 through the second stop valve 15, and the other path is connected to the four-way valve 2 through the first stop valve 16 and the check valve 17.

[0079] Under the normal operating state, the second stop valve 15 is opened, the first stop valve 16 is closed, and the limit valve of the enthalpy-increasing compressor is closed. The system is the same as the conventional enthalpy-increasing system.

[0080] When entering the anti-liquid hammer or refrigerant charging mode, the second shut-off valve 15 is closed, the first shut-off valve 16 is opened, the coil of the limiting valve of the enthalpy-increasing compressor is energized, and the enthalpy-increasing port of the enthalpy-increasing compressor is short-circuited in parallel with the exhaust port, realizing pressure relief through the enthalpy-increasing port. The valve plate at the compressor exhaust port opens in advance, and the liquid refrigerant is discharged from the compressor in advance through the enthalpy-increasing port and the exhaust port, avoiding liquid hammer.

[0081] Among them, the anti-liquid hammer mode is automatically recognized by the system, and the refrigerant charging mode is manually set to start and stop.

[0082] The anti-liquid hammer mode can automatically recognize the following situations.

[0083] In the first case, before the enthalpy-increasing compressor 1 starts, when the liquid level sensor in the gas-liquid separator detects that the liquid level is higher than the safety liquid level, the start of the enthalpy-increasing compressor operates in the anti-liquid hammer mode, that is, the second shut-off valve 15 is closed, the first shut-off valve 16 is opened, and the coil of the limiting valve of the enthalpy-increasing compressor 1 is energized and opened. When the liquid level in the gas-liquid separator returns below the safety liquid level, the anti-liquid hammer mode is exited. At this time, the first shut-off valve 16 is closed, the second shut-off valve 15 is controlled to switch according to the enthalpy-increasing demand, and the coil of the limiting valve of the enthalpy-increasing compressor is de-energized and closed.

[0084] In the second case, when there is no liquid level sensor in the gas-liquid separator of the air-conditioning system, identify the indoor and outdoor temperature difference of the enthalpy-increasing compressor at this time. When the outdoor temperature is below the indoor temperature by A °C or more, and the shutdown time of the enthalpy-increasing compressor is greater than X hours, it can be considered that the refrigerant naturally migrates to the outdoor unit with a lower temperature (lower pressure) under the temperature condition. At this time, there is a risk of liquid hammer when starting up, and the anti-liquid hammer mode can be started, and the actions are as above.

[0085] Among them, the specific values of the indoor and outdoor temperature difference A and the shutdown duration X can be automatically learned and corrected through the operating parameters of the air-conditioning system. When the system has been running for B minutes after starting the compressor in the normal mode, the system suction superheat < α °C, or the exhaust superheat < β °C. For example, α is about 0 and β is about 10 (the specific values of α and β are related to the system compressor and refrigerant type, and their values can be adjusted according to the actual situation). It is considered that there is liquid in the suction at this time and there is a risk of liquid hammer. Compare the values of the indoor and outdoor temperature difference A and the shutdown duration X before this startup with the preset values of the program, and save the smaller one of them, and continuously update the data values of A and X automatically to avoid the risk of liquid hammer during compressor startup.

[0086] When it is detected that the system suction superheat > α °C, or the exhaust superheat > β °C, the anti-liquid hammer mode is exited, and the specific actions are as in the first case.

[0087] In the third case, when the system is about to exit the defrosting mode, the system will switch from refrigeration operation to heating operation. The condenser and evaporator will be switched, and the refrigerant flow direction within the system will change. During defrosting, the condenser is the finned heat exchanger of the outdoor unit, and after exiting defrosting, the condenser is the plate heat exchanger of the indoor unit. At the moment when the four-way valve changes direction, the incompletely condensed two-phase refrigerant at the inlet of the finned heat exchanger of the outdoor unit turns and flows towards the suction port of the booster compressor, posing a risk of liquid slugging. Therefore, whenever the system enters or exits defrosting, it enters the anti-liquid slugging mode. When the four-way valve changes direction, the first stop valve 16 is opened, and the second stop valve 15 remains closed (it needs to be closed when entering defrosting), and the compressor limit valve coil is energized and opened. The exit conditions are the same as those in the second case.

[0088] When the refrigerant filling mode is enabled, the refrigerant filling machine is connected to the filling port joint of the indoor unit, and the four-way valve maintains the refrigeration flow direction. At this time, the indoor unit is the low-pressure side with a relatively low pressure. The refrigerant is sucked from the refrigerant filling machine into the plate heat exchanger of the indoor unit, enters the gas-liquid separator after evaporative heat exchange, and then enters the suction port of the compressor. Due to the refrigerant filling causing the refrigerant flow rate to be greater than the normal operating refrigerant flow rate, the plate heat exchanger cannot evaporate completely, posing a risk of liquid refrigerant entering the compressor. Therefore, when the compressor starts, the first stop valve 16 is opened, the second stop valve 15 is closed, the coil of the limit valve of the booster compressor is energized and opened, and the boosting port of the booster compressor is shunted in parallel with the exhaust port to achieve pressure relief through the boosting port. The valve plate at the exhaust port of the booster compressor is opened in advance, and the liquid refrigerant is discharged from the compressor through the boosting port and the exhaust port in advance to avoid liquid slugging. When the refrigerant filling is completed, the filling joint is closed tightly, and the compressor continues to operate for M minutes to evenly circulate the system refrigerant and then stops, closing all loads and exiting the refrigerant filling mode.

[0089] Figure 6 It is a schematic diagram of the refrigerant flow direction within the air-conditioning system during refrigerant filling of the present utility model.

[0090] Figure 7 It is a schematic diagram of the refrigerant flow direction within the air-conditioning system during heating of the present utility model.

[0091] The dashed part in the figure represents the closed flow path.

[0092] Based on the technical solution of the present utility model, corresponding control means can be adopted to prevent compressor liquid slugging and extend the service life. Moreover, refrigerant can be filled through the indoor unit, which is convenient for after-sales operation.

[0093] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. An enthalpy-increasing compressor, comprising a compression chamber and an enthalpy-increasing pipe connected to the compression chamber, characterized in that, It further includes: A valve plate, one side edge of which is fixedly connected to the inner wall of the enthalpy-increasing pipe, and the opposite side edge is swingable; A limit valve, which is arranged on the inner wall of the enthalpy-increasing pipe corresponding to the swingable side edge of the valve plate, and can move back and forth towards or away from the valve plate. When the limit valve is connected to the swingable side edge of the valve plate, it restricts the valve plate from swinging towards the direction away from the enthalpy-increasing port; A driving device for driving the limit valve to move.

2. The enhanced enthalpy compressor according to claim 1, wherein, The limit valve is made of a ferromagnetic material or a metal that can be attracted by a magnetic material. The driving device includes: At least one elastic member, one end of which is fixedly connected, and the other end is connected to the limit valve for driving the limit valve to move away from the valve plate; At least one set of coils, which drive the limit valve to move towards the valve plate when the coils are energized.

3. The enhanced enthalpy compressor according to claim 1, wherein, The driving device is an electric telescopic rod.

4. The enhanced enthalpy compressor according to claim 1, characterized in that, The limit valve penetrates through the enthalpy-increasing pipe, and the driving device is arranged outside the enthalpy-increasing pipe.

5. The enhanced enthalpy compressor according to claim 4, wherein The limit valve is movably and hermetically connected to the enthalpy-increasing pipe, or a sealing cover covering the limit valve is provided outside the enthalpy-increasing pipe.

6. The enhanced enthalpy compressor according to claim 1, wherein The valve plate is made of stainless steel.

7. An air conditioning system, comprising a compressor, an outdoor heat exchanger and an end heat exchanger, characterized in that, The compressor is the enthalpy-increasing compressor according to any one of claims 1 to 6.

8. The air conditioning system according to claim 7, wherein, The air-conditioning system is a heat pump system. A first electronic expansion valve and a second electronic expansion valve are provided between the outdoor heat exchanger and the terminal heat exchanger. A steam recovery heat exchanger is provided between the first electronic expansion valve and the second electronic expansion valve. The enthalpy-increasing pipe of the enthalpy-increasing compressor is respectively connected to the steam recovery heat exchanger and the four-way valve through a pipe valve assembly.

9. The air conditioning system according to claim 8, wherein, The pipe valve assembly includes: a first pipeline connected to the enthalpy-increasing pipe, a second pipeline with one end connected to the first pipeline and the other end connected to the four-way valve, a third pipeline with one end connected to the first pipeline and the other end connected to the steam recovery heat exchanger, a one-way valve and a first stop valve provided on the second pipeline, and a second stop valve provided on the third pipeline.

10. The air conditioning system according to claim 9, wherein, The steam recovery heat exchanger is a flash tank or an economizer.

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