Heat source unit and air conditioner

Abstract

The embodiment of the present application discloses a heat source unit and an air conditioner. The heat source unit includes: a compressor; a heat source heat exchanger for heat exchange with an external heat source; a liquid side external interface and a gas side external interface, both for connecting to a load heat exchanger through an external pipeline; and a refrigerant pipeline connecting the compressor, the heat source heat exchanger, the liquid side external interface and the gas side external interface, the refrigerant pipeline includes a first pipeline and a branch pipeline, the first pipeline connects the heat source heat exchanger and the liquid side external interface; the branch pipeline has a starting end and at least one terminal end, the starting end is connected to the first pipeline, the at least one terminal end is connected to the injection nozzle of the compressor and / or the return air port of the compressor, and at least part of the pipe body of the branch pipeline is made of stainless steel. In this way, the fatigue strength of the branch pipeline can be improved, which is beneficial to improving the fatigue strength and reliability of the heat source unit, and further beneficial to improving the reliability and stability of the air conditioner.

Description

Technical Field

[0001] The present application relates to the technical field of air-conditioning equipment, and in particular to a heat source unit and an air conditioner. Background Art

[0002] The air conditioner heat exchange system includes key refrigeration components and refrigerant piping, among which the key refrigeration components include compressors, control valves, etc.

[0003] The compressor will vibrate continuously during operation, causing the refrigerant pipes connected to or close to the compressor to easily suffer from fatigue cracking, thus affecting the normal operation of the air conditioner. Summary of the Invention

[0004] The embodiments of the present application provide a heat source unit and an air conditioner to improve the reliability and stability of the air conditioning system.

[0005] In the first aspect, an embodiment of the present application provides a heat source unit, comprising: a compressor; a heat source heat exchanger for heat exchange with an external heat source; a liquid side external interface and a gas side external interface, both for connecting to a load heat exchanger through an external pipeline; and a refrigerant pipeline, connecting the compressor, the heat source heat exchanger, the liquid side external interface and the gas side external interface, the refrigerant pipeline comprising a first pipeline and a branch pipeline, the first pipeline connecting the heat source heat exchanger and the liquid side external interface; the branch pipeline having a starting end and at least one terminal end, the starting end being connected to the first pipeline, the at least one terminal end being connected to the injection pipe of the compressor and / or the return air port of the compressor, and at least part of the pipe body of the branch pipeline being made of stainless steel.

[0006] In this application, at least a portion of the branch pipe is made of stainless steel, which has high strength, excellent corrosion resistance, and good mechanical properties. Compared to the copper used in related art branch pipes, this material improves the fatigue resistance of the branch pipe and reduces the probability of fatigue fracture due to compressor vibration, refrigerant impact, etc., thereby improving the fatigue resistance and reliability of the heat source unit, and thus the reliability and stability of the air conditioning system. Furthermore, it helps reduce costs.

[0007] In some embodiments, the heat source unit further includes a subcooler, the subcooler including a main flow channel and an auxiliary flow channel, the main flow channel is serially connected to the first pipe, and the auxiliary flow channel is serially connected to the branch pipe, so that the refrigerant in the branch pipe cools the refrigerant in the first pipe;

[0008] The auxiliary flow channel is provided with an upstream port and a downstream port along the direction from the starting end to the terminal end, and at least a portion of the pipe body of the branch pipe between the downstream port and the at least one terminal end is made of stainless steel.

[0009] Such a setting is beneficial to improving the fatigue strength of the branch pipe between the subcooler and the terminal, reducing the probability of fatigue fracture due to compressor vibration, refrigerant impact, etc., thereby improving the fatigue strength and reliability of the heat source unit, and further improving the reliability and stability of the air-conditioning system.

[0010] In some embodiments, the heat source unit further comprises an expansion valve disposed in the branch pipe and located between the starting end and the upstream port, the expansion valve comprising a first valve body and a valve core located in the first valve body;

[0011] The branch pipeline includes a first valve connecting pipe and a second valve connecting pipe, the first valve body is connected to the first valve connecting pipe and the second valve connecting pipe respectively, and the valve core is used to control the on-off and / or pipeline opening between the first valve connecting pipe and the second valve connecting pipe;

[0012] At least one of the first valve connecting pipe and the second valve connecting pipe is made of stainless steel, and / or the first valve body is made of stainless steel.

[0013] Such a setting can improve the fatigue strength of the branch pipe located between the upstream port and the starting end, reduce the probability of fatigue fracture due to compressor vibration, refrigerant impact, etc., thereby helping to improve the fatigue strength and reliability of the heat source unit, and further help to improve the reliability and stability of the air-conditioning system.

[0014] In some embodiments, the first valve connecting pipe and the second valve connecting pipe are both made of stainless steel;

[0015] One end of the first valve connecting pipe is inserted into the opening of the pipe wall of the first pipe, and the other end is directly welded to the first valve body or welded to the first valve body through a copper joint;

[0016] One end of the second valve connecting pipe is directly connected to the first valve body by welding or through a copper joint, and the other end is directly connected to the upstream port by welding or through a copper joint.

[0017] This arrangement further improves the fatigue resistance and reliability of the branch pipe, thereby further enhancing the reliability and stability of the air conditioning system. It also facilitates easier connection between the first valve connecting pipe and the first pipe, as well as easier and more reliable welding between the first valve connecting pipe and the first valve body. Furthermore, it facilitates easier and more reliable welding between the second valve connecting pipe and the first valve body, and between the second valve connecting pipe and the upstream port.

[0018] In some embodiments, the number of the terminal is one, and the terminal is connected to the injection pipe of the compressor;

[0019] At least a portion of the branch pipe is made of stainless steel.

[0020] Such a setting can improve the fatigue strength of the branch pipe and reduce the probability of fatigue rupture of the branch pipe due to compressor vibration, refrigerant impact, etc., which is beneficial to improving the fatigue strength and reliability of the heat source unit, and further beneficial to improving the reliability and stability of the air-conditioning system.

[0021] In some embodiments, the heat source unit further includes a muffler, which is arranged between the starting end and the injection pipe;

[0022] Wherein, the branch pipe includes a first section of pipe body and a second section of pipe body, the first section of pipe body is located between the starting end and the muffler, and the second section of pipe body is located between the muffler and the injection pipe;

[0023] At least a portion of the first section of the pipe and / or at least a portion of the second section of the pipe is made of stainless steel.

[0024] Making at least a portion of the second pipe section from stainless steel helps reduce the probability of fatigue rupture of the branch pipe due to compressor vibration, refrigerant impact, etc., thereby improving the reliability and stability of the air conditioning system. Making at least a portion of the first pipe section from stainless steel helps reduce the probability of fatigue rupture of the branch pipe due to impact of high-pressure refrigerant, thereby improving the reliability and service life of the air conditioning system.

[0025] In some embodiments, the heat source unit further includes a subcooler, the subcooler including a main flow channel and an auxiliary flow channel, the main flow channel is connected to the first pipe, and the auxiliary flow channel is connected to the first section of the pipe body, so that the refrigerant in the branch pipe cools the refrigerant in the first pipe;

[0026] The auxiliary flow channel is provided with an upstream port and a downstream port along the direction from the starting end to the terminal end. At least a portion of the first pipe section located between the downstream port and the muffler is made of stainless steel. This improves the high-temperature tolerance of the first pipe section, suppresses pipe deformation, and reduces the probability of cracking in the welds between the first pipe section and other components due to thermal stress. Furthermore, it improves the fatigue resistance of the first pipe section, thereby enhancing the reliability and lifespan of the branch pipe.

[0027] In some embodiments, the heat source unit further includes a control valve provided on the first section of the pipe body, the control valve being used to control the on / off of the first section of the pipe body;

[0028] The muffler comprises a muffler shell, the outlet end of the control valve is connected to the inlet end of the muffler shell, and the muffler shell is made of stainless steel.

[0029] By setting the muffler shell as a stainless steel shell, the fatigue strength of the muffler shell is improved, which in turn helps to further improve the reliability and service life of the branch pipe.

[0030] In some embodiments, the second section of the pipe body includes a main pipe body and a first copper joint and a second copper joint connected to both ends of the main pipe body, the main pipe body is connected to the outlet end of the muffler housing through the first copper joint, and the main pipe body is connected to the injection pipe through the second copper joint, and the main pipe body is made of stainless steel.

[0031] That is, the welding between the second section of the pipe body and the jet nozzle can be achieved based on the existing welding conditions at the welding site, thereby facilitating improved welding convenience.

[0032] In some embodiments, the main pipe is sleeved or plugged into the first copper joint and the second copper joint, the second copper joint is sleeved or plugged into the injection pipe, and the first copper joint is sleeved or plugged into the muffler housing;

[0033] The insertion depth or the socket depth is greater than or equal to 7 mm and less than or equal to 30 mm.

[0034] By setting the insertion depth or socket depth within this range, there will be sufficient connection strength and fatigue resistance between the main body and the first copper joint, between the main body and the second copper joint, between the second copper joint and the injection pipe, and between the first copper joint and the muffler housing, and it is also beneficial to reduce costs and improve assembly convenience.

[0035] In some embodiments, the number of the terminals is two and they are respectively a first terminal and a second terminal;

[0036] The first terminal is connected to the injection pipe of the compressor, and the second terminal is connected to the return air port of the compressor. The branch pipe includes a primary branch pipe and a first branch pipe and a second branch pipe formed by branching from the primary branch pipe. The primary branch pipe forms the starting end, the first branch pipe forms the first terminal, and the second branch pipe forms the second terminal.

[0037] At least part of the pipe body of the first-level branch pipe is made of stainless steel;

[0038] And / or, at least a portion of the first branch pipe is made of stainless steel;

[0039] And / or, at least a portion of the second branch pipe is made of stainless steel.

[0040] Such a setting is conducive to reducing the probability of fatigue rupture of the branch pipe due to the impact of high-pressure refrigerant, thereby improving the reliability and service life of the air-conditioning system.

[0041] In some embodiments, the heat source unit includes a muffler, which is provided on the first branch pipe, and at least a portion of the first branch pipe located between the muffler and the injection pipe is made of stainless steel.

[0042] Setting at least part of the tube body of the first branch pipe located between the muffler and the injection pipe to stainless steel material can improve the fatigue strength of the first branch pipe, adapt to high-pressure injection and extreme temperatures, inhibit vibration transmission and fatigue cracking, and thus help to improve the service life and reliability of the enthalpy increase pipeline.

[0043] In some embodiments, the muffler includes a muffler housing, wherein the muffler housing is made of a stainless steel material;

[0044] The heat source unit further includes a first control valve, which is provided on the first branch pipe, and an outlet end of the first control valve is connected to an inlet end of the muffler housing.

[0045] By providing the first control valve, the first branch pipe can be switched on and off, thereby controlling the switching on and off of the entire enthalpy-increasing pipeline, thereby helping to save energy.

[0046] In some embodiments, the heat source unit includes a second control valve, which is provided on the second branch pipe and is used to control the opening and closing of the second branch pipe;

[0047] At least a portion of the second branch pipe located between the second control valve and the air return port is made of stainless steel.

[0048] By providing a second control valve, the second branch pipe can be opened and closed, thereby controlling the opening and closing of the branch pipe's return air line, thereby saving energy. Furthermore, at least a portion of the second branch pipe between the second control valve and the return air port is made of stainless steel. This improves the fatigue resistance of the second branch pipe, thereby increasing the service life and reliability of the branch pipe's return air line.

[0049] In some embodiments, the second manifold comprises a first section and a second section;

[0050] The heat source unit further comprises a three-way valve, a filling valve and a filling pipe;

[0051] One end of the first section is in communication with the primary branch pipeline, and the other end is in communication with the inlet end of the second control valve;

[0052] One end of the filling pipe is connected to the filling valve, and the other end is connected to the first port of the three-way valve;

[0053] The second port of the three-way valve is communicated with the outlet end of the second control valve, one end of the second section is communicated with the third port of the three-way valve, and the other end is communicated with the air return port;

[0054] The first section, the second section, and at least a portion of the filling tube are made of stainless steel, and / or at least a portion of the three-way valve is made of stainless steel.

[0055] This allows for multiple functions, including refrigerant charging and recovery, and the start and stop of the second branch pipe. Furthermore, it improves the fatigue resistance of the second branch pipe and the charging pipe, thereby increasing the service life and reliability of the branch return and charging pipes. Furthermore, it improves the strength and reliability of the three-way valve, thereby increasing its service life and reliability.

[0056] In some embodiments, the invention further comprises a filter assembly disposed in the muffler, wherein the filter assembly comprises a clamp and a filter screen, the filter screen is mounted on the clamp, and the clamp is mounted in the muffler;

[0057] The filter screen is made of stainless steel, and / or the clamp is made of stainless steel, thereby improving the service life and reliability of the filter screen and the clamp.

[0058] In a second aspect, an embodiment of the present application provides an air conditioner comprising the heat source unit described in the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0060] Figure 1 This is a schematic structural diagram of an air conditioner in one embodiment of the present application;

[0061] Figure 2 This is a schematic diagram of one structure of a branch pipeline and a first pipeline in one embodiment of the present application;

[0062] Figure 3 This is another structural diagram of an air conditioner in one embodiment of the present application;

[0063] Figure 4This is another structural schematic diagram of the branch pipeline and the first pipeline in one embodiment of the present application;

[0064] Figure 5 This is a schematic diagram of the connection structure of the subcooler and the expansion valve in one embodiment of the present application;

[0065] Figure 6 for Figure 5 The schematic diagram of the partially decomposed structure shown;

[0066] Figure 7 Schematic diagram of the cross-sectional structure of a muffler and a control valve in one embodiment of the present application;

[0067] Figure 8 This is a schematic diagram of one connection structure of a muffler, a control valve, and an injection pipe in one embodiment of the present application;

[0068] Figure 9 This is a schematic diagram of the connection structure of a stainless steel pipe and a copper joint in an embodiment of the present application;

[0069] Figure 10 This is a schematic diagram of the connection structure of the primary branch pipe, the first branch pipe, and the second branch pipe in one embodiment of the present application;

[0070] Figure 11 This is another structural diagram of the branch pipeline and the first pipeline in one embodiment of the present application;

[0071] Figure 12 This is a schematic diagram of the connection structure of the second branch pipe, the filling valve, and the second control valve in one embodiment of the present application.

[0072] Reference numerals:

[0073] 1. Air conditioner;

[0074] 10. Heat source unit; 11. Load side unit; 43. Clamp; 42. Filter;

[0075] 100, compressor; 110, injection pipe; 120, return air port;

[0076] 200, heat source heat exchanger; 300, liquid side external interface; 400, gas side external interface; 500, refrigerant pipeline;

[0077] 510, first pipeline;

[0078] 520, branch pipe; 521, first valve connecting pipe; 522, second valve connecting pipe; 520a, first pipe section; 520b, second pipe section; 523, main pipe; 524, first copper joint; 525, second copper joint; 526, primary branch pipe; 527, first branch pipe; 528, second branch pipe; 5281, first section; 5282, second section; 530, subcooler; 531, main flow channel; 532, auxiliary flow channel; 5321, upstream port; 5322, downstream port; 540, expansion valve; 541, first valve body; 550, three-way valve; 560, charging valve; 570, charging pipe;

[0079] 600, load heat exchanger; 700, muffler; 710, muffler housing; 800, control valve; 810, first control valve; 820, second control valve; 900, gas-liquid separator. DETAILED DESCRIPTION

[0080] In order to make the purpose, technical solutions and advantages of this application more clearly understood, the present application is 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 this application and are not intended to limit this application.

[0081] The air conditioner heat exchange system includes key refrigeration components and refrigerant piping, among which the key refrigeration components include compressors, refrigerant pipelines, control valves, etc.

[0082] However, the compressor will vibrate continuously during operation, causing the refrigerant pipes connected to the compressor to be prone to fatigue cracking, thereby affecting the normal operation of the air conditioner.

[0083] Based on the above problems, the embodiments of the present application propose a heat source unit and an air conditioner to improve the problem of fatigue cracking of the refrigerant pipeline caused by the vibration of the compressor, thereby helping to improve the service life and reliability of the air conditioner.

[0084] like Figures 1 to 4As shown, in a first aspect, an embodiment of the present application provides a heat source unit 10 . The heat source unit 10 includes a compressor 100, a heat source heat exchanger 200, a liquid side external interface 300, a gas side external interface 400 and a refrigerant pipeline 500. The heat source heat exchanger 200 is used for heat exchange with an external heat source. The liquid side external interface 300 and the gas side external interface 400 are both used to connect to the load heat exchanger 600 through an external pipeline. The refrigerant pipeline 500 connects the compressor 100, the heat source heat exchanger 200, the liquid side external interface 300 and the gas side external interface 400. The refrigerant pipeline 500 includes a first pipe 510 and a branch pipe 520. The first pipe 510 connects the heat source heat exchanger 200 and the liquid side external interface 300. The branch pipe 520 has a starting end A and at least one terminal N. The starting end A is connected to the first pipe 510, and the at least one terminal N is connected to the injection pipe 110 of the compressor 100 and / or the return air port 120 of the compressor. At least part of the pipe body of the branch pipe 520 is made of stainless steel.

[0085] The compressor 100 is used to compress a low-pressure gaseous refrigerant into a high-temperature, high-pressure gaseous refrigerant, which is then discharged into a condenser for cooling, and finally condensed into a high-temperature, high-pressure liquid refrigerant, providing power for the refrigerant to circulate in the refrigerant circulation loop. It is the heart of the refrigeration system. The compressor 100 in the embodiment of the present application can be a piston compressor 100, a screw compressor 100, a centrifugal compressor 100, or a linear compressor 100. The injection nozzle 110 of the compressor 100 can be used to replenish the refrigerant, and the return air port 120 is used to recover the gaseous refrigerant.

[0086] The heat source heat exchanger 200 is used to exchange heat with an external heat source. The heat source heat exchanger 200 can be a condenser or an evaporator in the air conditioning system. Specifically, when the refrigerant in the heat source heat exchanger 200 releases heat to the outside air, the heat source heat exchanger 200 is a condenser; when the heat source heat exchanger 200 absorbs heat from the outside air, the heat source heat exchanger 200 is an evaporator. It can be understood that in the air conditioning system, the heat source heat exchanger 200 corresponds to the load heat exchanger 600. The heat source heat exchanger 200 can be regarded as a heat exchanger on the outdoor side, while the load heat exchanger 600 can be regarded as a heat exchanger on the indoor side.

[0087] The liquid-side external port 300 and the gas-side external port 400 are connected to the load heat exchanger 600 via external piping. The external piping and the load heat exchanger 600 constitute the load-side unit 11. The liquid-side external port 300 and the gas-side external port 400 are located at the refrigerant inlet and refrigerant outlet, respectively, of the load heat exchanger 600. Specifically, when refrigerant flows from the heat source heat exchanger 200 to the load heat exchanger 600, the liquid-side external port 300 is located at the refrigerant inlet of the load heat exchanger 600, and the gas-side external port 400 is located at the refrigerant outlet of the load heat exchanger 600. When refrigerant flows from the load heat exchanger 600 to the heat source heat exchanger 200, the liquid-side external port 300 is located at the refrigerant outlet of the load heat exchanger 600, and the gas-side external port 400 is located at the refrigerant inlet of the load heat exchanger 600.

[0088] The refrigerant pipeline 500 connects the compressor 100, the heat source heat exchanger 200, the liquid-side external port 300, and the gas-side external port 400. That is, one end of the refrigerant pipeline 500 is the liquid-side external port 300, and the other end is the gas-side external port 400. The compressor 100 and the heat source heat exchanger 200 are connected in series to the refrigerant pipeline 500. Optionally, a reversing valve may also be connected in series. The refrigerant pipeline 500 is the refrigerant piping on the side of the entire air-conditioning system closest to the heat source heat exchanger 200. It is connected to the refrigerant piping of the load-side unit 11, thereby forming the refrigerant circulation path of the entire air-conditioning system.

[0089] The refrigerant pipeline 500 includes a first pipeline 510 and a branch pipeline 520. The first pipeline 510 is a section of the pipeline in the refrigerant pipeline 500 located between the liquid side external interface 300 and the heat source heat exchanger 200. The branch pipeline 520 is a branch of the first pipeline 510. The starting end A of the branch pipeline 520 is connected to the first pipeline 510, and its terminal end N is connected to the injection pipe 110 of the compressor 100 and / or the return air port 120 of the compressor 100, providing a channel for the diversion and replenishment of the refrigerant.

[0090] It should be noted that the starting end A and the terminal end N of the branch pipe 520 not only limit the connection position of the branch pipe 520, but also limit the running direction of the refrigerant. Regardless of the running direction of the refrigerant in the first pipe 510, in the branch pipe 520, the refrigerant runs from the starting end A to the terminal end N.

[0091] The branch pipe 520 has at least one terminal N, that is, the branch pipe 520 can have one terminal N or two terminals N. The branch pipe 520 can realize dynamic adjustment of the refrigerant.

[0092] It is understood that the terminal N is connected to the injection pipe 110 of the compressor 100 and / or the return air port 120 of the compressor 100. That is, when the branch pipe 520 has one terminal N, the terminal N can be connected to the return air port 120 of the compressor 100, or the terminal N can be connected to the injection pipe 110 of the compressor 100. When the branch pipe 520 has two terminals N, the two terminals can be connected to the injection pipe 110 of the compressor 100 and the return air port 120 of the compressor 100, respectively.

[0093] Specifically, when branch pipe 520 has a single terminal N and is connected to the return air port 120 of compressor 100, branch pipe 520 can serve as another return air channel for compressor 100. Excess refrigerant can circulate to compressor 100 through branch pipe 520, preventing liquid hammer in compressor 100 caused by incomplete evaporation of refrigerant, thereby improving the safety and reliability of compressor 100. In this case, compressor 100 is not equipped with injection nozzle 110.

[0094] like Figure 1 and Figure 2 As shown, when branch pipe 520 has a single terminal N and is connected to injection nozzle 110, branch pipe 520 can be considered as a heat-increasing pipe for compressor 100. Branch pipe 520 enables multi-stage utilization of refrigerant. After the refrigerant diverted from branch pipe 520 is reduced to medium pressure, it can be injected into compressor 100 through injection nozzle 110, mixing with the refrigerant in the compression chamber, absorbing compression heat, lowering the exhaust temperature and compression ratio, thereby reducing compression power consumption and increasing exhaust volume. In this case, compressor 100 is equipped with injection nozzle 110.

[0095] like Figure 3 and Figure 4 As shown, when branch pipe 520 has two terminals N (N1 and N2), and the two terminals N of branch pipe 520 are connected to injection nozzle 110 and return air port 120, respectively, branch pipe 520 flows into injection nozzle 110, thereby realizing the injection enthalpy increase function of compressor 100. At the same time, branch pipe 520 transports some liquid refrigerant to return air port 120 of compressor 100, preventing liquid hammer in compressor 100 caused by incomplete refrigerant evaporation, thereby improving the safety and reliability of compressor 100. In this case, compressor 100 is equipped with injection nozzle 110.

[0096] In the present application, at least part of the pipe body of the branch pipe 520 is made of stainless steel. Stainless steel has high strength, excellent corrosion resistance and good mechanical properties. Compared with the use of copper material to make the branch pipe 520 in the related technology, it can improve the fatigue strength of the branch pipe 520 and reduce the probability of fatigue rupture of the branch pipe 520 due to vibration of the compressor 100, refrigerant impact, etc., which is beneficial to improving the fatigue strength and reliability of the heat source unit 10, and further beneficial to improving the reliability and stability of the air-conditioning system.

[0097] In addition, using stainless steel to make at least a portion of the branch pipe 520 can also reduce the weight of the branch pipe 520, thereby also contributing to lightweighting of the air conditioner.

[0098] Furthermore, the use of stainless steel to replace the copper tube in the related art is also beneficial to reducing costs. It is understandable that in the subsequent embodiments, the beneficial effect of cost reduction will not be repeated.

[0099] In some embodiments, as Figures 1 to 6 As shown, the heat source unit 10 further includes a subcooler 530, which includes a main flow channel 531 and a secondary flow channel 532. The main flow channel 531 is serially connected to the first pipe 510, and the secondary flow channel 532 is serially connected to the branch pipe 520, so that the refrigerant in the branch pipe 520 cools the refrigerant in the first pipe 510. The secondary flow channel 532 is provided with an upstream port 5321 and a downstream port 5322 along the direction from the starting end A to the terminal N. At least a portion of the branch pipe 520 located between the downstream port 5322 and at least one terminal N is made of stainless steel.

[0100] The subcooler 530 is used to exchange heat between the liquid refrigerant in the first pipe 510 and the refrigerant in the branch pipe 520. The refrigerant in the auxiliary flow channel 532 of the subcooler 530 absorbs heat from the refrigerant in the main flow channel 531, achieving subcooling. The refrigerant in the main flow channel 531 and the refrigerant in the auxiliary flow channel 532 are arranged in countercurrent. This improves the subcooling of the liquid refrigerant in the first pipe 510, thereby enhancing cooling and heating capabilities. The branch pipe 520 recovers the refrigerant temperature in the first pipe 510, thereby enhancing the jet enthalpy increase effect and reducing the probability of liquid hammer.

[0101] Further, refer to Figure 3 and Figure 4At least a portion of the branch pipe 520 between the downstream port 5322 and at least one terminal N is made of stainless steel. This configuration improves the fatigue strength of the branch pipe 520 between the subcooler 530 and the terminal N, reducing the probability of fatigue fracture caused by vibration of the compressor 100, refrigerant impact, etc., thereby improving the fatigue strength and reliability of the heat source unit 10, and further enhancing the reliability and stability of the air conditioning system.

[0102] In some embodiments, as Figures 1 to 6 As shown, the heat source unit 10 also includes an expansion valve 540 arranged in the branch pipe 520 and located between the starting end A and the upstream port 5321. The expansion valve 540 includes a first valve body 541 and a valve core (not shown in the figure) located in the first valve body 541. The branch pipe 520 includes a first valve connecting pipe 521 and a second valve connecting pipe 522. The first valve body 541 is connected to the first valve connecting pipe 521 and the second valve connecting pipe 522 respectively. The valve core is used to control the on-off and / or pipeline opening between the first valve connecting pipe 521 and the second valve connecting pipe 522. At least one of the first valve connecting pipe 521 and the second valve connecting pipe 522 is made of stainless steel, and / or the first valve body 541 is made of stainless steel.

[0103] The expansion valve 540 is used to control the flow of refrigerant from the first valve connecting pipe 521 to the second valve connecting pipe 522 and / or adjust the pipe opening. The expansion valve 540 is located between the starting end A and the upstream port 5321. In other words, the opening of the expansion valve 540 can be adjusted from 0 to 100%. This further improves the accuracy of regulating the refrigerant flow in the branch pipe 520.

[0104] The first valve connection 521 is connected between the first valve body 541 and the starting end A, supplying high-pressure liquid refrigerant to the first valve body 541. The second valve connection 522 is connected between the first valve body 541 and the upstream port 5321, supplying throttled refrigerant to the subcooler 530. The expansion valve 540, on the one hand, allows the valve core to change the flow channel cross-sectional area, thereby controlling the refrigerant flow in the branch pipe 520 and balancing the refrigerant distribution ratio between the first pipe 510 and the branch pipe 520. On the other hand, it allows the branch pipe 520 to be opened and closed, and the expansion valve 540 can function as a shut-off valve. Furthermore, the high-pressure liquid refrigerant is throttled and depressurized when flowing through the expansion valve 540, generating a low-temperature two-phase flow. This controls the refrigerant dryness at the output and provides a phase change foundation for subsequent heat exchange in the subcooler 530. This further reduces the probability of liquid hammer in the compressor 100, improving operational reliability and safety, and also enhances the reliability of the subcooler 530.

[0105] Furthermore, at least one of the first valve connecting pipe 521 and the second valve connecting pipe 522 is made of stainless steel. This configuration improves the fatigue strength of the branch pipe 520 between the upstream port 5321 and the starting end A, reducing the probability of fatigue fracture caused by vibration of the compressor 100, refrigerant impact, etc., thereby improving the fatigue strength and reliability of the heat source unit 10, and further improving the reliability and stability of the air conditioning system.

[0106] Furthermore, the first valve body 541 is made of stainless steel, which is also conducive to improving the fatigue resistance of the expansion valve 540, thereby improving the reliability and stability of the air-conditioning system.

[0107] It is understood that when the first valve connecting pipe 521, the second valve connecting pipe 522 and the first valve body 541 are all made of stainless steel, the thermal expansion coefficients of the same materials are consistent, which can also reduce the probability of refrigerant leakage caused by thermal stress. Optionally, the expansion valve 540 can be an electronic expansion valve.

[0108] In some embodiments, as Figures 1 to 6 As shown, the first valve connecting pipe 521 and the second valve connecting pipe 522 are both made of stainless steel. One end of the first valve connecting pipe 521 is inserted into the opening in the pipe wall of the first pipe 510, and the other end is directly welded and connected to the first valve body 541 or welded through a copper joint. One end of the second valve connecting pipe 522 is directly welded and connected to the first valve body 541 or welded through a copper joint, and the other end is directly welded and connected to the upstream port 5321 or welded through a copper joint.

[0109] In this embodiment, both the first valve connecting pipe 521 and the second valve connecting pipe 522 are made of stainless steel. One end of the first valve connecting pipe 521 is connected to the first pipe 510, and the other end is connected to the first valve body 541. One end of the second valve connecting pipe 522 is connected to the first valve body 541, and the other end is connected to the upstream port 5321. In other words, both the pipe sections between the expansion valve 540 and the starting point A, and the pipe sections between the expansion valve 540 and the upstream port 5321, are made of stainless steel. This arrangement further improves the fatigue resistance and reliability of the branch pipe 520, thereby further enhancing the reliability and stability of the air conditioning system.

[0110] In addition, one end of the first valve connecting pipe 521 can be plugged into the opening of the pipe wall of the first pipe 510 and then welded to form the starting end A of the branch pipe 520. This is conducive to improving the convenience of connecting the first valve connecting pipe 521 to the first pipe 510.

[0111] The other end of the first valve connecting pipe 521 can be directly welded to the first valve body 541. This reduces the number of copper joints, welds, and welding times, thereby lowering welding costs while improving welding reliability and stability. Alternatively, the first valve connecting pipe 521 and the first valve body 541 can be directly welded externally using furnace brazing, high-frequency welding, or other methods.

[0112] Alternatively, the other end of the first valve connecting pipe 521 can be welded to the first valve body 541 via a copper joint. A copper joint refers to a joint made of a material mainly composed of copper, for example, the material of the copper joint can be pure copper or a copper alloy such as copper-tin alloy or copper-zinc alloy.

[0113] The copper joint is relatively easy to weld and can be welded by manual welding. In this case, the other end of the first valve connecting pipe 521 can be welded with a copper joint in advance by furnace brazing, high-frequency welding, etc. When the first valve body 541 is a copper valve body, the copper joint of the first valve connecting pipe 521 and the copper first valve body 541 can be directly welded by manual welding, which has low requirements for the factory's welding equipment conditions; when the first valve body 541 is a stainless steel valve body, the first valve body 541 can also be welded with a copper joint in advance. In this way, the copper joint of the first valve connecting pipe 521 and the copper joint of the stainless steel valve body can also be welded by manual welding, which also has low requirements for the factory's welding equipment conditions. In this way, the welding of the first valve connecting pipe 521 and the first valve body 541 can be achieved based on the existing welding conditions, which is conducive to improving the convenience of welding.

[0114] Similarly, one end of the second valve connecting pipe 522 can be directly welded to the first valve body 541, and the other end can be directly welded to the upstream port 5321. This helps reduce the number of copper joints used, the number of welds, and the number of welds, thereby reducing welding costs while improving welding reliability and stability. Alternatively, the direct welding of the second valve connecting pipe 522 to the first valve body 541 and the direct welding of the second valve connecting pipe 522 to the upstream port 5321 can be completed externally through furnace brazing, high-frequency welding, or other methods.

[0115] Alternatively, one end of the second valve connecting pipe 522 can be welded to the first valve body 541 via a copper joint, and the other end can be welded to the upstream port 5321 via a copper joint. In this way, the welding of the first valve connecting pipe 521 and the first valve body 541 can be achieved based on existing welding conditions, thereby facilitating improved welding convenience.

[0116] In some embodiments, as Figure 1 and Figure 2As shown, there is one terminal N, which is connected to the injection nozzle 110. At least a portion of the branch pipe 520 is made of stainless steel. In this case, the branch pipe 520 serves as the enthalpy-increasing pipe for the compressor 100. This, on the one hand, helps reduce the exhaust temperature and compression ratio, thereby reducing compression power consumption and increasing exhaust volume. On the other hand, it improves the fatigue resistance of the branch pipe 520, reducing the probability of fatigue fracture caused by vibration of the compressor 100, refrigerant impact, etc., thereby improving the fatigue resistance and reliability of the heat source unit 10, and thus the reliability and stability of the air conditioning system.

[0117] In some embodiments, as Figure 1 and Figure 2 As shown, the heat source unit 10 also includes a muffler 700, which is arranged between the starting end A and the injection pipe 110, wherein the branch pipe 520 includes a first section of the pipe body 520a and a second section of the pipe body 520b, the first section of the pipe body 520a is located between the starting end A and the muffler 700, and the second section of the pipe body 520b is located between the muffler 700 and the injection pipe 110, and at least part of the first section of the pipe body 520a and / or at least part of the second section of the pipe body 520b is made of stainless steel.

[0118] The muffler 700 suppresses the noise of the refrigerant flow and optimizes the stability of the injection enthalpy increase process. At the muffler 700, the branch pipe 520 is divided into a first pipe section 520a and a second pipe section 520b. The first pipe section 520a extends from the starting end A to the muffler 700, and the second pipe section 520b extends from the muffler 700 to the injection nozzle 110.

[0119] The second pipe section 520b is located near the compressor 100 and must withstand the vibration of the compressor 100 and the high-frequency pressure fluctuations of the refrigerant. Making at least part of it from stainless steel helps reduce the probability of fatigue fracture of the branch pipe 520 due to vibration of the compressor 100 and refrigerant impact, thereby improving the reliability and stability of the air conditioning system.

[0120] First pipe section 520a is located near the branch point of first pipe 510. The refrigerant pressure in first pipe 510 is high, so first pipe section 520a must withstand the impact of the high-pressure refrigerant. Making at least a portion of this section of pipe 520a from stainless steel helps reduce the likelihood of fatigue fracture in branch pipe 520 due to the impact of the high-pressure refrigerant, thereby improving the reliability and service life of the air conditioning system.

[0121] In some embodiments, as Figure 1 and Figure 2As shown, the main flow channel 531 of the subcooler 530 is connected to the first pipe 510, and the auxiliary flow channel 532 of the subcooler 530 is connected to the first section of the pipe 520a, so that the refrigerant in the branch pipe 520 cools the refrigerant in the first pipe 510, and at least a portion of the first section of the pipe 520a located between the downstream port 5322 and the muffler 700 is made of stainless steel.

[0122] The subcooler 530 is used to increase the subcooling degree of the first pipe 510, thereby improving heating and cooling capacity. In this embodiment, the refrigerant temperature exiting the downstream port 5322 of the subcooler 530 will rise. Therefore, at least a portion of the first pipe section 520a located between the downstream port 5322 and the muffler 700 is made of stainless steel. Stainless steel has good heat resistance and a low coefficient of thermal expansion. This improves the high-temperature tolerance of the first pipe section 520a, inhibits pipe deformation, and reduces the probability of cracking in the welds between the first pipe section 520a and other components due to thermal stress. Furthermore, this improves the fatigue resistance of the first pipe section 520a, thereby increasing the reliability and lifespan of the branch pipe 520.

[0123] In some embodiments, as Figure 1 、 Figure 2 and Figure 7 As shown, the heat source unit 10 further includes a control valve 800 disposed on the first tube section 520a. The control valve 800 is used to control the on / off state of the first tube section 520a. The control valve 800 may be, for example, a solenoid valve. The muffler 700 includes a muffler housing 710. The outlet of the control valve 800 is connected to the inlet of the muffler housing 710. The muffler housing 710 is made of stainless steel.

[0124] Since the terminal N of the branch pipe 520 is connected to only one injection port, the branch pipe 520 is an enthalpy-increasing pipe. The control valve 800 can open and close the first section of the pipe 520a, thereby controlling the opening and closing of the entire branch pipe 520, thereby improving the flexibility and accuracy of the control of the branch pipe 520. The inlet end of the muffler housing 710 is connected to the outlet end of the control valve 800, that is, the muffler 700 is located downstream of the control valve 800. Optionally, the two can be connected by welding a copper joint or directly by welding, which is not limited in this application.

[0125] By configuring the muffler housing 710 as a stainless steel housing, the fatigue strength of the muffler housing 710 is improved, thereby further improving the reliability and service life of the branch pipe 520 .

[0126] In some embodiments, as Figure 2 、 Figure 7 Shown and referenced Figure 8The second section of the pipe body 520b includes a main pipe body 523 and a first copper joint 524 and a second copper joint 525 connected to the two ends of the main pipe body 523. The main pipe body 523 is connected to the outlet end of the muffler housing 710 through the first copper joint 524, and the main pipe body 523 is connected to the injection pipe 110 through the second copper joint 525. The main pipe body 523 is made of stainless steel.

[0127] Since the second section of the pipe body 520b is close to the injection pipe 110 of the compressor 100, if the second section of the pipe body 520b is entirely made of stainless steel, welding between the second section of the pipe body 520b and the injection pipe 110 is relatively inconvenient. Therefore, the second section of the pipe body 520b of this embodiment includes a main pipe body 523, a first copper joint 524 and a second copper joint 525, and the main pipe body 523 is connected to the muffler housing 710 and the injection pipe 110 respectively through the first copper joint 524 and the second copper joint 525. Among them, the first copper joint 524 and the second copper joint 525 can be welded to the main pipe body 523 in advance by furnace brazing. In this way, the second section of the pipe body 520b and the injection pipe 110 can be directly welded by manual welding, that is, the welding between the second section of the pipe body 520b and the injection pipe 110 can be achieved based on the existing welding conditions of the welding site, which is conducive to improving the convenience of welding.

[0128] Alternatively, as Figure 7 As shown, a copper joint can be welded to the outlet end of the muffler housing 710 first, and then the copper joint at the outlet end of the muffler housing 710 is welded to the first copper joint 524, thereby further improving the convenience of welding the muffler housing 710 and the main body 523.

[0129] Alternatively, in other embodiments, as Figure 8 As shown, the stainless steel main body 523 can be directly welded to the outlet end of the muffler housing 710. In this case, it is beneficial to reduce welds, reduce costs, improve welding reliability and stability, and reduce the probability of weld cracking.

[0130] It should be noted that when the welding equipment meets the requirements, if the two parts of the pipe body to be welded are both stainless steel, it is necessary to consider whether the other structures of these two parts can withstand the welding conditions required for brazing and high-frequency welding, such as welding temperature, welding time, welding space, etc. If not, two copper joints will need to be used for indirect welding between the stainless steel pipes. In other words, copper joints will need to be welded to the ends of the two stainless steel pipe bodies in advance. Similarly, if the processing site does not have the conditions for welding stainless steel pipes, two copper joints will also need to be used for indirect welding between the stainless steel pipes.

[0131] In some embodiments, as Figure 2 、 Figure 7 Shown and referenced Figure 8 The main body 523 is connected to or inserted into the first copper joint 524 and the second copper joint 525, the second copper joint 525 is connected to or inserted into the injection pipe 110, and the first copper joint 524 is connected to or inserted into the muffler housing 710. For example, in a specific embodiment, the main body 523 is connected to the first copper joint 524 and the second copper joint 525, the second copper joint 525 is connected to the injection pipe 110, and the first copper joint 524 is connected to the muffler housing 710.

[0132] The main body 523 is sleeved or plugged into the first copper joint 524, so that a portion of the main body 523 overlaps a portion of the first copper joint 524. In this way, the main body 523 and the first copper joint 524 have stronger structural strength and stronger fatigue resistance at the overlapping portion.

[0133] Similarly, the main body 523 is sleeved or plugged into the second copper joint 525, so that part of the main body 523 overlaps with part of the second copper joint 525. In this way, the main body 523 and the second copper joint 525 have stronger structural strength and stronger fatigue resistance in the overlapping part.

[0134] Similarly, the second copper joint 525 is sleeved or plugged into the injection pipe 110. In this way, the injection pipe 110 and the second copper joint 525 have stronger structural strength and fatigue resistance at the overlapping portion.

[0135] Similarly, the first copper joint 524 is sleeved or plugged into the muffler housing 710. In this way, the muffler housing 710 and the first copper joint 524 have stronger structural strength and fatigue resistance at the overlapping portion.

[0136] The insertion depth or the socket depth is greater than or equal to 7 mm and less than or equal to 30 mm, for example, 7 mm, 10 mm, 13 mm, 16 mm, 20 mm, 23 mm, 25 mm, 27 mm, 29 mm, 30 mm, etc.

[0137] It is understood that if the insertion depth or sleeve depth is longer, for example, greater than 30mm, although the connection strength and fatigue resistance are enhanced, the assembly difficulty will increase, and the consumable materials of the tube body will increase, resulting in waste and assembly inconvenience. If the insertion depth or sleeve depth is less than 7mm, the connection strength and fatigue resistance will not meet the requirements, and the positioning length between the tubes will be insufficient, which will also increase the difficulty of assembly.

[0138] Setting the insertion depth or sleeve depth within this range ensures sufficient connection strength and fatigue resistance between the main body 523 and the first copper joint 524, between the main body 523 and the second copper joint 525, between the second copper joint 525 and the injection nozzle 110, and between the first copper joint 524 and the muffler housing 710. This also helps reduce costs and improve assembly convenience. Optionally, this insertion depth or sleeve depth requirement applies to welding between any two stainless steel pipes and copper pipes.

[0139] In some embodiments, as Figure 9 As shown, the overlapping portion of the stainless steel pipe S1 (e.g., the main pipe body 523) and the copper joint S2 (e.g., the first copper joint 524, the second copper joint 525) is provided with a first solder layer B1 formed by a first solder, and the overlapping portion of the copper pipe S3 (e.g., the interface of the injection nozzle 110 and the copper muffler shell 710) and the copper joint S2 (e.g., the first copper joint 524, the second copper joint 525) is provided with a second solder layer B2 formed by a second solder, and the melting point of the first solder is higher than the melting point of the second solder.

[0140] This example illustrates a specific method for welding stainless steel to copper to copper. It's understood that this combination requires separate welding. Because the melting point of the first solder is higher than that of the second solder, the stainless steel tube and the copper joint can be welded together first, followed by welding the copper joint to the other copper pipe. This improves the reliability and stability of the welded connection.

[0141] Optionally, furnace welding can be used between stainless steel and stainless steel, and between stainless steel and copper. In a high-temperature environment, there is hydrogen or hydrogen decomposed from ammonia inside the furnace. The reducing gas can reduce the oxide film on the outside of the stainless steel, thereby spreading the solder and completing diffusion brazing.

[0142] In some embodiments, the thickness of the first welding layer B1 and the second welding layer B2 are both less than or equal to 0.1 mm, for example, 0.1 mm, 0.08 mm, 0.06 mm, or 0.04 mm.

[0143] Generally speaking, larger welds deteriorate corrosion resistance because they are more susceptible to stress concentration and microcracks, which accelerate corrosion. The thinner the first and second weld layers (B1, B2), the smaller the welds, reducing the likelihood of weld cracking and improving refrigerant delivery reliability.

[0144] In some embodiments, knurling or wire drawing is provided between the stainless steel pipe and the copper joint, and knurling or wire drawing is provided between the copper pipe and the copper joint, thereby helping to further improve the reliability of welding.

[0145] In some embodiments, as Figure 3 、 Figure 4 As shown, there are two terminals N, namely the first terminal N1 and the second terminal N2. The first terminal N1 is connected to the injection pipe 110 of the compressor 100, and the second terminal N2 is connected to the return air port 120 of the compressor 100. The branch pipe 520 includes a first-level branch pipe 526 and a first branch pipe 527 and a second branch pipe 528 formed by branching from the first-level branch pipe 526. The first-level branch pipe 526 corresponds to the starting end A, the first branch pipe 527 corresponds to the first terminal N1, and the second branch pipe 528 corresponds to the second terminal N2.

[0146] In this embodiment, the branch pipe 520 includes a primary branch pipe 526, and a first branch pipe 527 and a second branch pipe 528 branching from the primary branch pipe 526. Thus, the primary branch pipe 526 to the first branch pipe 527 constitutes the enthalpy increase pipe of the compressor 100, while the primary branch pipe 526 to the second branch pipe 528 constitutes the return air pipe of the compressor 100. This arrangement not only reduces compression power consumption and increases exhaust volume, but also prevents liquid hammer in the compressor 100 caused by incomplete evaporation of the refrigerant, thereby improving the safety and reliability of the compressor 100.

[0147] Optionally, the second branch pipe 528 may be first connected to the gas-liquid separator 900 , and the gas-liquid separator 900 may be connected to the return air port 120 of the compressor 100 , thereby achieving connection between the second branch pipe 528 and the return air port 120 .

[0148] Furthermore, in some embodiments, Figure 3 、 Figure 4 、 Figure 10 and Figure 11 As shown, at least a portion of the primary branch pipe 526 is made of stainless steel. Primary branch pipe 526 is located near the diversion point of first pipe 510, where the refrigerant pressure is high. Therefore, primary branch pipe 526 must withstand the impact of the high-pressure refrigerant. Making at least a portion of it of stainless steel helps reduce the probability of fatigue fracture in branch pipe 520 due to the impact of the high-pressure refrigerant, thereby improving the reliability and service life of the air conditioning system.

[0149] In some embodiments, as Figure 3 、 Figure 4 、 Figure 10 and Figure 11As shown, at least a portion of the first branch pipe 527 is made of stainless steel. First branch pipe 527 is located close to compressor 100 and must withstand vibrations from compressor 100 and high-frequency pressure fluctuations of the refrigerant. Making at least a portion of it of stainless steel helps reduce the likelihood of fatigue fractures in branch pipes 520 caused by the impact of high-pressure refrigerant, thereby improving the reliability and service life of the air conditioning system.

[0150] In some embodiments, as Figure 3 、 Figure 4 、 Figure 10 and Figure 11 As shown, at least a portion of the second branch pipe 528 is made of stainless steel. Second branch pipe 528 is also located close to compressor 100 and must withstand vibrations from compressor 100 and high-frequency pressure fluctuations from the refrigerant. Making at least a portion of it of stainless steel helps reduce the likelihood of fatigue fractures in branch pipe 520 caused by the impact of high-pressure refrigerant, thereby improving the reliability and service life of the air conditioning system.

[0151] In some embodiments, as Figure 3 、 Figure 4 、 Figure 10 and Figure 11 As shown, the muffler 700 is disposed on the first branch pipe 527, and at least a portion of the first branch pipe 527 located between the muffler 700 and the injection pipe 110 is made of stainless steel.

[0152] The first branch pipe 527 is connected to the injection nozzle 110 and forms part of the injection enthalpy increase pipeline. Its pressure must be greater than the return air pressure. Installing a muffler 700 in the first branch pipe 527 reduces high-frequency noise during the injection enthalpy increase process. Furthermore, constructing at least a portion of the first branch pipe 527 between the muffler 700 and the injection nozzle 110 from stainless steel improves its fatigue resistance, adapting it to high-pressure injection and extreme temperatures, and suppressing vibration transmission and fatigue cracking, thereby improving the service life and reliability of the enthalpy increase pipeline.

[0153] In some embodiments, as Figure 3 、 Figure 4 and Figure 11 As shown, the muffler 700 includes a muffler housing 710, which is made of stainless steel. The heat source unit 10 also includes a first control valve 810, which is provided in the first branch pipe 527. The outlet of the first control valve 810 is connected to the inlet of the muffler housing 710. It can be understood that the first control valve 810 is Figures 1 to 2 The connection method between the control valve 800 and the muffler housing 710 in the illustrated embodiment will not be described in detail here.

[0154] By providing the first control valve 810, the first branch pipe 527 can be opened and closed, thereby controlling the opening and closing of the entire enthalpy-increasing pipeline. This helps save energy. The outlet of the first control valve 810 and the inlet of the muffler housing 710 can be connected by welding a copper joint or directly, which is not limited in this application.

[0155] In some embodiments, as Figure 3 、 Figure 4 、 Figure 10 and Figure 11 As shown, the heat source unit 10 includes a second control valve 820, which is provided on the second branch pipe 528 and is used to control the opening and closing of the second branch pipe 528. By providing the second control valve 820, the opening and closing of the second branch pipe 528 can be achieved, thereby controlling the opening and closing of the return air pipeline of the branch pipe 520, thereby facilitating energy conservation. In addition, by providing the first control valve 810 and the second control valve 820, the distribution ratio of the refrigerant between the first branch pipe 527 and the second branch pipe 528 can be flexibly adjusted, optimizing the suction state of the compressor 100 and the injection enthalpy increase effect, thereby taking into account both system energy efficiency and reliability.

[0156] Furthermore, at least a portion of the second branch pipe 528 between the second control valve 820 and the return air port 120 is made of stainless steel. This improves the fatigue strength of the second branch pipe 528, thereby increasing the service life and reliability of the return air line of the branch pipe 520.

[0157] In some embodiments, as Figure 10 and Figure 12 As shown, the second branch pipe 528 includes a first section 5281 and a second section 5282. The heat source unit 10 also includes a three-way valve 550, a charging valve 560, and a charging pipe 570. One end of the first section 5281 is connected to the primary branch pipe 526, and the other end is connected to the inlet of the second control valve 820. One end of the charging pipe 570 is connected to the charging valve 560, and the other end is connected to the first port of the three-way valve 550. The second port of the three-way valve 550 is connected to the outlet of the second control valve 820. One end of the second section 5282 is connected to the third port of the three-way valve 550, and the other end is connected to the return air port 120. Specifically, at least a portion of the first section 5281, the second section 5282, and the charging pipe 570 are made of stainless steel, and / or at least a portion of the three-way valve 550 is made of stainless steel.

[0158] In this embodiment, the second branch pipe 528 is integrated with a three-way valve 550, a charging valve 560, and a second control valve 820, thereby dividing the second branch pipe 528 into a first section 5281 and a second section 5282. Two ports of the three-way valve 550 are respectively connected to the charging valve 560 and the second control valve 820, and the other port is connected to the second section 5282. The first section 5281 is connected to the inlet end of the second control valve 820. In other words, the first section 5281 is the refrigerant inlet pipe of the second branch pipe 528, which is connected to the primary branch pipe 526. The second control valve 820 controls the on-off between the first section 5281 and the second port of the three-way valve 550. The charging valve 560 is connected to an external refrigerant charging device for refrigerant filling or recovery. The charging pipe 570 connects the charging valve 560 and the first port of the three-way valve 550 to form a refrigerant charging / recovery path. The second section 5282 is connected to the third port of the third-way valve 550 to guide the refrigerant to the return air port 120.

[0159] When the second control valve 820 is opened, the three-way valve 550 can connect the first port and the second port, so that the refrigerant can be recovered through the charging valve 560; or, the three-way valve 550 can connect the second port and the third port, so that the second branch pipe 528 can transport the refrigerant to the return air port 120.

[0160] When the second control valve 820 is closed, the three-way valve 550 connects the first and third ports, allowing refrigerant to be charged into the system through the charging valve 560. Alternatively, the three-way valve 550 blocks the third port, stopping the second branch pipe 528 from delivering refrigerant. This allows for multiple functions, including refrigerant charging, recovery, and starting and stopping the second branch pipe 528.

[0161] Furthermore, at least a portion of the first section 5281, the second section 5282, and the filling pipe 570 are made of stainless steel. This configuration improves the fatigue strength of the second branch pipe 528 and the filling pipe 570, thereby increasing the service life and reliability of the return air line and the filling line of the branch pipe 520.

[0162] Furthermore, at least a portion of the three-way valve 550 is made of stainless steel, thereby improving the strength and reliability of the three-way valve 550 and further improving the service life and reliability of the three-way valve 550.

[0163] In some embodiments, as Figure 7 As shown, the heat source unit 10 also includes a filter assembly arranged in the muffler 700, the filter assembly includes a clamp 43 and a filter 42, the filter 42 is installed on the clamp 43, the clamp 43 is installed in the muffler 700, the filter 42 is made of stainless steel material, and / or the clamp 43 is made of stainless steel material.

[0164] The filter 42 can filter impurities in the refrigerant to prevent the impurities in the refrigerant from entering the compressor 100 and the gas-liquid separator. In this embodiment, the filter 42 is configured as a stainless steel filter, which is conducive to improving the service life and reliability of the filter 42.

[0165] In order to increase the contact area between the filter 42 and the refrigerant medium, the filter 42 includes a circular bottom and an inverted truncated cone-shaped peripheral side portion, and the bottom is fixed to the end of the inverted truncated cone with a smaller diameter.

[0166] Furthermore, the filter 42 is fixed to the inside of the muffler 700 via the clamp 43, so that the filter 42 and the muffler 700 are detachably connected, thereby facilitating the removal and replacement of the filter 42.

[0167] Furthermore, the material of the clamp 43 is stainless steel, which is beneficial to improving the service life and reliability of the clamp 43.

[0168] like Figure 1 and Figure 3 As shown, in a second aspect, an embodiment of the present application provides an air conditioner 1 comprising the heat source unit 10 described in the first aspect. This arrangement can reduce the probability of fatigue fracture of the branch pipe 520 due to vibration of the compressor 100, refrigerant impact, etc., thereby improving the fatigue resistance and reliability of the heat source unit 10, and further improving the reliability and stability of the air conditioner.

[0169] The same or similar numbers in the drawings of this embodiment correspond to the same or similar parts; in the description of this application, it should be understood that if the terms "up", "down", "left", "right", etc. indicate directions or positional relationships, they are based on the directions or positional relationships shown in the drawings. This is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting this application. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0170] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A heat source unit, characterized in that: include: compressor; Heat source heat exchanger, used for heat exchange with external heat source; The liquid side external interface and the gas side external interface are both used to connect to the load heat exchanger through external pipelines; a refrigerant pipeline connecting the compressor, the heat source heat exchanger, the liquid side external port, and the gas side external port, the refrigerant pipeline comprising a first pipe and a branch pipe, the first pipe communicating with the heat source heat exchanger and the liquid side external port, the branch pipe having a starting end and a terminal end, the starting end communicating with the first pipe, and the terminal end communicating with the injection nozzle of the compressor; a muffler, the muffler being arranged between the starting end and the injection pipe, the muffler comprising a muffler housing, the branch pipe comprising a first pipe section and a second pipe section, the first pipe section being located between the starting end and the muffler, and the second pipe section being located between the muffler and the injection pipe; At least part of the first section of the pipe body is made of stainless steel, the second section of the pipe body includes a main pipe body and a first copper joint and a second copper joint connected to both ends of the main pipe body, the main pipe body is connected to the outlet end of the muffler housing through the first copper joint, and the main pipe body is connected to the injection pipe through the second copper joint, and the main pipe body is made of stainless steel.

2. The heat source unit according to claim 1, wherein The heat source unit further includes a subcooler, the subcooler including a main flow channel and an auxiliary flow channel, the main flow channel being serially connected to the first pipe, and the auxiliary flow channel being serially connected to the branch pipe so that the refrigerant in the branch pipe cools the refrigerant in the first pipe; the auxiliary flow channel is provided with an upstream port and a downstream port along a direction from the starting end to the terminal end; the heat source unit further includes an expansion valve provided in the branch pipe and located between the starting end and the upstream port, the expansion valve including a first valve body and a valve core located in the first valve body; The branch pipeline includes a first valve connecting pipe and a second valve connecting pipe, the first valve body is connected to the first valve connecting pipe and the second valve connecting pipe respectively, and the valve core is used to control the on-off and / or pipeline opening between the first valve connecting pipe and the second valve connecting pipe; At least one of the first valve connecting pipe and the second valve connecting pipe is made of stainless steel, and / or the first valve body is made of stainless steel.

3. The heat source unit according to claim 2, wherein: The first valve connecting pipe and the second valve connecting pipe are both made of stainless steel; One end of the first valve connecting pipe is inserted into the opening of the pipe wall of the first pipe, and the other end is directly welded to the first valve body or welded to the first valve body through a copper joint; One end of the second valve connecting pipe is directly connected to the first valve body by welding or through a copper joint, and the other end is directly connected to the upstream port by welding or through a copper joint.

4. The heat source unit according to claim 1, wherein The heat source unit further includes a subcooler, the subcooler including a main flow channel and an auxiliary flow channel, the main flow channel is connected to the first pipe, and the auxiliary flow channel is connected to the first section of the pipe body, so that the refrigerant in the branch pipe cools the refrigerant in the first pipe; The auxiliary flow channel is provided with an upstream port and a downstream port along the direction from the starting end to the terminal end, and at least a portion of the first section of the pipe body located between the downstream port and the muffler is made of stainless steel.

5. The heat source unit according to claim 4, characterized in that The heat source unit further includes a control valve provided on the first section of the pipe body, the control valve being used to control the on / off of the first section of the pipe body; The outlet end of the control valve is connected to the inlet end of the muffler shell, and the muffler shell is made of stainless steel. The heat source unit according to claim 1 , wherein: The main pipe is sleeved or plugged into the first copper joint and the second copper joint, the second copper joint is sleeved or plugged into the injection pipe, and the first copper joint is sleeved or plugged into the muffler housing; The insertion depth or the socket depth is greater than or equal to 7 mm and less than or equal to 30 mm.

7. The heat source unit according to claim 1, wherein Also included is a filter assembly disposed in the muffler, the filter assembly comprising a clamp and a filter screen, the filter screen being mounted on the clamp, and the clamp being mounted in the muffler; The filter screen is made of stainless steel, and / or the clamp is made of stainless steel.

8. An air conditioner, characterized in that: The heat source unit comprises the heat source unit according to any one of claims 1 to 7.

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