Heat source unit and air conditioner

Abstract

The embodiment of the invention discloses a heat source unit and an air conditioner. The heat source unit includes: a compressor; the heat source heat exchanger exchanges heat with an external heat source; the liquid side external interface and the gas side external interface are both used for being connected with a load heat exchanger through an external pipeline; the refrigerant pipeline is connected with the compressor, the heat source heat exchanger, the liquid side external connector and the gas side external connector, the refrigerant pipeline comprises a first pipeline and a branch pipeline, and the first pipeline is communicated with the heat source heat exchanger and the liquid side external connector; the branch pipeline is provided with a starting end and at least one terminal end, the starting end is communicated with the first pipeline, the at least one terminal end is communicated with an injection connecting pipe of the compressor and / or an air return port of the compressor, and at least part of a pipe body of the branch pipeline is made of a stainless steel material. Therefore, the anti-fatigue strength of the branch pipelines can be improved, the anti-fatigue strength and reliability of the heat source unit can be improved, and then the reliability and stability of the air conditioner can be improved.

Description

Technical Field

[0001] This application relates to the technical field of air conditioning equipment, and particularly to a heat source unit and an air conditioner. Background Art

[0002] The heat exchange system of an air conditioner includes key refrigeration components and refrigerant pipes. Among them, the key refrigeration components include a compressor, a control valve, etc.

[0003] During operation, the compressor will continuously vibrate, resulting in the refrigerant pipes connected to or close to the compressor being prone to fatigue cracking problems, thus affecting the normal operation of the air conditioner. Summary of the Invention

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

[0005] In a first aspect, embodiments of this application provide a heat source unit, including: 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, and the at least one terminal end is connected to the injection nozzle of the compressor and / or the suction port of the compressor. At least part of the pipe body of the branch pipeline is made of stainless steel material.

[0006] In this application, at least part of the pipe body of the branch pipeline is made of stainless steel material. Stainless steel has high strength, excellent corrosion resistance and good mechanical properties. Compared with using copper material to make the branch pipeline in the related art, it can improve the fatigue strength of the branch pipeline and reduce the probability of fatigue rupture of the branch pipeline due to the vibration of the compressor, refrigerant impact, etc., thus being beneficial to improving the fatigue strength and reliability of the heat source unit, and further being beneficial to improving the reliability and stability of the air conditioning system. In addition, it is also beneficial to reduce costs.

[0007] In some embodiments, the heat source unit further includes a subcooler. The subcooler includes a main flow channel and an auxiliary flow channel. The main flow channel is connected in series in the first pipeline, and the auxiliary flow channel is connected in series in the branch pipeline to cool the refrigerant in the first pipeline with the refrigerant in the branch pipeline; 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 part of the pipe body of the branch pipeline between the downstream port and the at least one terminal end is made of stainless steel material.

[0008] With such a setting, it is beneficial to improve the anti-fatigue strength of the branch pipeline between the subcooler and the terminal, reduce the probability of fatigue rupture caused by the vibration of the compressor, refrigerant impact, etc., thereby being beneficial to improving the anti-fatigue strength and reliability of the heat source unit, and further being beneficial to improving the reliability and stability of the air-conditioning system.

[0009] In some embodiments, the heat source unit further includes an expansion valve disposed in the branch pipeline and between the starting end and the upstream port. The expansion valve includes a first valve body and a valve core located inside the first valve body. The branch pipeline includes a first valve connecting pipe and a second valve connecting pipe. The first valve body is respectively connected to the first valve connecting pipe and the second valve connecting pipe. The valve core is used to control the on / off and / or pipeline opening degree 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 material, and / or the first valve body is made of stainless steel material.

[0010] With such a setting, it is possible to improve the anti-fatigue strength of the branch pipeline between the upstream port and the starting end, reduce the probability of fatigue rupture caused by the vibration of the compressor, refrigerant impact, etc., thereby being beneficial to improving the anti-fatigue strength and reliability of the heat source unit, and further being beneficial to improving the reliability and stability of the air-conditioning system.

[0011] In some embodiments, both the first valve connecting pipe and the second valve connecting pipe are made of stainless steel material. One end of the first valve connecting pipe is inserted into the pipe wall opening of the first pipeline, and the other end is directly welded to the first valve body or welded through a copper joint. One end of the second valve connecting pipe is directly welded to the first valve body or welded through a copper joint, and the other end is directly welded to the upstream port or welded through a copper joint.

[0012] With such a setting, it is beneficial to further improve the anti-fatigue strength and reliability of the branch pipeline, and further beneficial to improving the reliability and stability of the air-conditioning system. In addition, it is beneficial to improve the convenience of connecting the first valve connecting pipe to the first pipeline and the welding convenience and reliability between the first valve connecting pipe and the first valve body. Moreover, it is beneficial to improve the welding convenience and reliability between the second valve connecting pipe and the first valve body and between the second valve connecting pipe and the upstream port.

[0013] In some embodiments, the number of the terminals is one, and the terminal is connected to the injection connecting pipe of the compressor. At least a part of the pipe body of the branch pipeline is made of stainless steel material.

[0014] With such a setting, the anti-fatigue strength of the branch pipeline can be improved, and the probability of fatigue rupture of the branch pipeline due to the vibration of the compressor, refrigerant impact, etc. can be reduced, which is beneficial to improving the anti-fatigue strength and reliability of the heat source unit, and further beneficial to improving the reliability and stability of the air-conditioning system.

[0015] In some embodiments, the heat source unit further includes a muffler, and the muffler is disposed between the starting end and the injection connection pipe; Wherein, the branch pipeline includes a first pipe body and a second pipe body, the first pipe body is located between the starting end and the muffler, and the second pipe body is located between the muffler and the injection connection pipe; At least part of the first pipe body and / or at least part of the second pipe body are made of stainless steel material.

[0016] Making at least part of the second pipe body made of stainless steel material is beneficial to reducing the probability of fatigue rupture of the branch pipeline due to the vibration of the compressor, refrigerant impact, etc., and further beneficial to improving the reliability and stability of the air-conditioning system. Making at least part of the first pipe body made of stainless steel material is beneficial to reducing the probability of fatigue rupture of the branch pipeline due to the impact of high-pressure refrigerant, and further beneficial to improving the reliability and service life of the air-conditioning system.

[0017] In some embodiments, the heat source unit further includes a subcooler, the subcooler includes a main flow channel and an auxiliary flow channel, the main flow channel is communicated with the first pipeline, and the auxiliary flow channel is communicated with the first pipe body to cool the refrigerant in the first pipeline by the refrigerant in the branch pipeline; 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 part of the first pipe body located between the downstream port and the muffler is made of stainless steel material. Thus, the high-temperature tolerance of the first pipe body is improved, the deformation of the pipe body can be inhibited, and the probability of weld cracking between the first pipe body and other components caused by thermal stress can be reduced. In addition, the anti-fatigue strength of the first pipe body can also be improved, which is also beneficial to improving the reliability and life of the branch pipeline.

[0018] In some embodiments, the heat source unit further includes a control valve disposed on the first pipe body, and the control valve is used to control the on-off of the first pipe body; The muffler includes a muffler housing, the outlet end of the control valve is connected to the inlet end of the muffler housing, and the muffler housing is made of stainless steel material.

[0019] By setting the muffler housing as a stainless steel housing, it is beneficial to improve the anti-fatigue strength of the muffler housing, and further beneficial to improving the reliability and service life of the branch pipeline.

[0020] In some embodiments, the second section of the pipe body includes a main pipe body, 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. The main pipe body is made of stainless steel material.

[0021] That is, it is possible to realize the welding between the second section of the pipe body and the injection pipe based on the existing welding conditions at the welding site, which is beneficial to improving the welding convenience.

[0022] In some embodiments, the main pipe body sleeves or inserts the first copper joint and the second copper joint, the second copper joint sleeves or inserts the injection pipe, and the first copper joint sleeves or inserts the muffler housing; Wherein, the insertion depth or the sleeve depth is greater than or equal to 7 mm and less than or equal to 30 mm.

[0023] By setting the insertion depth or the sleeve depth within this range, there is sufficient connection strength and anti-fatigue strength between the main pipe body and the first copper joint, between the main pipe 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. Moreover, it is beneficial to reduce costs and improve the assembly convenience.

[0024] In some embodiments, the number of the terminals is two and they are a first terminal and a second terminal respectively; The first terminal communicates with the injection pipe of the compressor, and the second terminal communicates with the suction port of the compressor. The branch pipe includes a primary branch pipe, a first branch pipe and a second branch pipe branched from the primary branch pipe. The primary branch pipe corresponds to form the starting end, the first branch pipe corresponds to form the first terminal, and the second branch pipe corresponds to form the second terminal. Among them, At least part of the pipe body of the primary branch pipe is made of stainless steel material; And / or, at least part of the pipe body of the first branch pipe is made of stainless steel material; And / or, at least part of the pipe body of the second branch pipe is made of stainless steel material.

[0025] With such a setting, it is beneficial to reduce the probability of the branch pipe suffering from fatigue rupture due to the impact of high-pressure refrigerant, and thus is beneficial to improving the reliability and service life of the air-conditioning system.

[0026] In some embodiments, the heat source unit includes a muffler. The muffler is arranged in the first branch pipe, and at least part of the pipe body of the first branch pipe between the muffler and the injection pipe is made of stainless steel material.

[0027] Setting at least part of the pipe body of the first manifold located between the muffler and the injection nozzle to a stainless steel material can improve the fatigue resistance of the first manifold, adapt to high-pressure injection and extreme temperatures, suppress vibration transmission and fatigue cracking, thereby facilitating the improvement of the service life and reliability of the enthalpy-increasing pipeline.

[0028] In some embodiments, the muffler includes a muffler housing made of stainless steel material; The heat source unit further includes a first control valve provided on the first manifold, and an outlet end of the first control valve is connected to an inlet end of the muffler housing.

[0029] By providing the first control valve, the on / off of the first manifold can be achieved, and further the on / off of the entire enthalpy-increasing pipeline can be controlled. Thus, it is beneficial to save energy consumption.

[0030] In some embodiments, the heat source unit includes a second control valve provided on the second manifold, and the second control valve is used to control the on / off of the second manifold; At least part of the pipe body of the second manifold located between the second control valve and the return air port is made of stainless steel material.

[0031] By providing the second control valve, the on / off of the second manifold can be achieved, and further the on / off of the return air pipeline of the branch pipeline can be controlled. Thus, it is beneficial to save energy consumption. Further, at least part of the pipe body of the second manifold located between the second control valve and the return air port is made of stainless steel material. Thus, the fatigue resistance of the second manifold can be improved, which is beneficial to improving the service life and reliability of the return air pipeline of the branch pipeline.

[0032] In some embodiments, the second manifold includes a first section and a second section; The heat source unit further includes a three-way valve, a charging valve and a charging pipe; One end of the first section is communicated with the primary branch pipeline, and the other end is communicated with an inlet end of the second control valve; One end of the charging pipe is communicated with the charging valve, and the other end is communicated with a first port of the three-way valve; A second port of the three-way valve is communicated with an outlet end of the second control valve, one end of the second section is communicated with a third port of the three-way valve, and the other end is communicated with the return air port; Wherein, at least part of the pipe bodies of the first section, the second section and the charging pipe are made of stainless steel material, and / or at least part of the three-way valve is made of stainless steel material.

[0033] Thus, multiple functions such as refrigerant charging, recovery, and start / stop of the second manifold can be achieved. In addition, it is beneficial to improve the fatigue resistance of the second manifold and the charging pipe, thereby facilitating the improvement of the service life and reliability of the return air pipe and the charging pipe of the branch pipeline. Moreover, it is beneficial to improve the strength and reliability of the three-way valve, and further conducive to improving the service life and reliability of the three-way valve.

[0034] In some embodiments, it further includes a filtering component disposed in the muffler. The filtering component includes a clamp and a filter screen. The filter screen is installed on the clamp, and the clamp is installed in the muffler. The filter screen is made of stainless steel material, and / or the clamp is made of stainless steel material. Thus, it is beneficial to improve the service life and reliability of the filter screen and the clamp.

[0035] In a second aspect, an embodiment of the present application provides an air conditioner, including the heat source unit described in the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0037] Figure 1 It is a schematic structural diagram of an air conditioner in an embodiment of the present application; Figure 2 It is a schematic structural diagram of a branch pipeline and a first pipeline in an embodiment of the present application; Figure 3 It is another schematic structural diagram of an air conditioner in an embodiment of the present application; Figure 4 It is another schematic structural diagram of a branch pipeline and a first pipeline in an embodiment of the present application; Figure 5 It is a schematic connection structure diagram of a subcooler and an expansion valve in an embodiment of the present application; Figure 6 For Figure 5 The shown partial exploded structural diagram; Figure 7 It is a schematic cross-sectional structure diagram of a muffler and a control valve in an embodiment of the present application; Figure 8 It is a schematic connection structure diagram of a muffler, a control valve, and an injection nozzle in an embodiment of the present application; Figure 9 It is a schematic connection structure diagram of a stainless steel pipe and a copper joint in an embodiment of the present application; Figure 10 Schematic diagram of the connection structure of the primary branch pipe, the first branch pipe, and the second branch pipe in an embodiment of the present application; Figure 11 Another schematic diagram of the branch pipe and the first pipe in an embodiment of the present application; Figure 12 Schematic diagram of the connection structure of the second branch pipe, the charging valve, and the second control valve in an embodiment of the present application.

[0038] Reference numerals: 1, air conditioner; 10, heat source unit; 11, load side unit; 43, clamp; 42, filter; 100, compressor; 110, injection connection pipe; 120, suction port; 200, heat source heat exchanger; 300, liquid side external interface; 400, gas side external interface; 500, refrigerant pipeline; 510, first pipe; 520, branch pipe; 521, first valve connection pipe; 522, second valve connection pipe; 520a, first section of the pipe body; 520b, second section of the pipe body; 523, main pipe body; 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; 600, load heat exchanger; 700, silencer; 710, silencer housing; 800, control valve; 810, first control valve; 820, second control valve; 900, gas-liquid separator. Detailed implementation manners

[0039] In order to make the objectives, technical solutions and advantages of the present application clearer and more understandable, the present application 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 application and are not used to limit the present application.

[0040] The heat exchange system of the air conditioner includes key refrigeration components and refrigerant pipes, and the key refrigeration components include a compressor, a refrigerant pipeline, a control valve, etc.

[0041] However, during the operation of the compressor, continuous vibration occurs, which may cause fatigue cracking of the refrigerant pipeline connected to the compressor, thus affecting the normal operation of the air conditioner.

[0042] Based on the above problems, an embodiment of the present application provides a heat source unit and an air conditioner to improve the problem that the refrigerant pipeline is prone to fatigue cracking caused by the vibration of the compressor, thereby facilitating the improvement of the working life and reliability of the air conditioner.

[0043] As Figures 1 to 4 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. Both the liquid-side external interface 300 and the gas-side external interface 400 are used to connect to a 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 pipeline 510 and a branch pipeline 520. The first pipeline 510 connects the heat source heat exchanger 200 and the liquid-side external interface 300. The branch pipeline 520 has a starting end A and at least one terminal N. The starting end A is connected to the first pipeline 510. At least one terminal N is connected to the injection nozzle 110 of the compressor 100 and / or the suction port 120 of the compressor. At least a part of the pipe body of the branch pipeline 520 is made of stainless steel material.

[0044] The compressor 100 is used to compress a low-pressure gaseous refrigerant medium into a high-temperature and high-pressure gaseous refrigerant medium, and then discharge it into a condenser for cooling, and finally condense it into a high-temperature and high-pressure liquid refrigerant medium, providing power for the refrigerant medium 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, etc. The injection nozzle 110 of the compressor 100 can be used to supplement the refrigerant, and the suction port 120 is used to recover the gaseous refrigerant.

[0045] The heat source heat exchanger 200 is used for heat exchange with an external heat source. The heat source heat exchanger 200 can be a condenser in an air conditioning system or an evaporator. Specifically, when the refrigerant in the heat source heat exchanger 200 releases heat to the external air, the heat source heat exchanger 200 is a condenser; when the heat source heat exchanger 200 absorbs heat from the external air, the heat source heat exchanger 200 is an evaporator. It can be understood that in an air conditioning system, the corresponding one to the heat source heat exchanger 200 is the load heat exchanger 600. The heat source heat exchanger 200 can be regarded as an outdoor-side heat exchanger, and the load heat exchanger 600 can be regarded as an indoor-side heat exchanger.

[0046] The liquid-side external interface 300 and the gas-side external interface 400 are connected to the load heat exchanger 600 through an external pipeline, and the external pipeline and the load heat exchanger 600 form the load-side unit 11. The liquid-side external interface 300 and the gas-side external interface 400 are respectively located on the refrigerant inlet side and the refrigerant outlet side of the load heat exchanger 600. Specifically, when the refrigerant flows from the heat source heat exchanger 200 to the load heat exchanger 600, the liquid-side external interface 300 is located on the refrigerant inlet side of the load heat exchanger 600, and the gas-side external interface 400 is located on the refrigerant outlet side of the load heat exchanger 600; when the refrigerant flows from the load heat exchanger 600 to the heat source heat exchanger 200, the liquid-side external interface 300 is located on the refrigerant outlet side of the load heat exchanger 600, and the gas-side external interface 400 is located on the refrigerant inlet side of the load heat exchanger 600.

[0047] 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. That is, one end of the refrigerant pipeline 500 is the liquid-side external interface 300, and the other end is the gas-side external interface 400. The compressor 100 and the heat source heat exchanger 200 are connected in series on the refrigerant pipeline 500. Optionally, a reversing valve can also be connected in series. The refrigerant pipeline 500 is the refrigerant pipe on the side of the heat source heat exchanger 200 in the entire air-conditioning system, and it is connected to the refrigerant pipe of the load-side unit 11, thus forming the refrigerant circulation path of the entire air-conditioning system.

[0048] The refrigerant pipeline 500 includes a first pipeline 510 and a branch pipeline 520. The first pipeline 510 is a section of pipeline in the refrigerant pipeline 500 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 communicated with the first pipeline 510, and its terminal end N is communicated with the injection nozzle 110 of the compressor 100 and / or the suction port 120 of the compressor 100, providing a channel for the diversion and replenishment of the refrigerant.

[0049] It should be noted that the starting end A and the terminal end N of the branch pipeline 520 not only define the connection position of the branch pipeline 520, but also define the running direction of the refrigerant. Regardless of the running direction of the refrigerant in the first pipeline 510, in the branch pipeline 520, the refrigerant runs from the starting end A to the terminal end N.

[0050] The branch pipeline 520 has at least one terminal end N. That is, the branch pipeline 520 can have one terminal end N or two terminal ends N, and the branch pipeline 520 can realize the dynamic regulation of the refrigerant.

[0051] It can be understood that the terminal N is connected to the injection pipe 110 of the compressor 100 and / or the suction port 120 of the compressor 100. That is, when the branch pipe 520 is a single terminal N, the terminal N can be connected to the suction 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 respectively connected to the injection pipe 110 of the compressor 100 and the suction port 120 of the compressor 100.

[0052] Specifically, when the terminal N of the branch pipe 520 is single and connected to the suction port 120 of the compressor 100, the branch pipe 520 can serve as another suction channel of the compressor 100. The excess refrigerant can circulate through the branch pipe 520 to the compressor 100, preventing the liquid slugging condition of the compressor 100 caused by incomplete evaporation of the refrigerant, thereby improving the safety and reliability of the operation of the compressor 100. In this case, the compressor 100 is not provided with an injection pipe 110.

[0053] As Figure 1 and Figure 2 shown, when the terminal N of the branch pipe 520 is single and connected to the injection pipe 110, the branch pipe 520 can be regarded as the enthalpy-increasing pipe of the compressor 100. The branch pipe 520 can realize the multi-stage utilization of the refrigerant. After part of the refrigerant shunted by the branch pipe 520 is reduced to medium pressure, it can be injected into the compressor 100 through the injection pipe 110, mixed with the refrigerant in the compression chamber, absorb the compression heat, reduce the exhaust temperature and the compression ratio, thereby reducing the compression power consumption and increasing the exhaust volume. In this case, the compressor 100 is provided with an injection pipe 110.

[0054] As Figure 3 and Figure 4 shown, when the branch pipe 520 has two terminals N (N1 and N2 respectively), and the two terminals N of the branch pipe 520 are respectively connected to the injection pipe 110 and the suction port 120, on the one hand, the branch pipe 520 flows into the injection pipe 110, thereby realizing the jet enthalpy-increasing function of the compressor 100. On the other hand, the branch pipe 520 transports part of the liquid refrigerant to the suction port 120 of the compressor 100, preventing the liquid slugging condition of the compressor 100 caused by incomplete evaporation of the refrigerant, thereby improving the safety and reliability of the operation of the compressor 100. In this case, the compressor 100 is provided with an injection pipe 110.

[0055] In this application, at least part of the pipe body of the branch pipe 520 is made of stainless steel material. Stainless steel has high strength, excellent corrosion resistance and good mechanical properties. Compared with using copper material to make the branch pipe 520 in the related art, the fatigue strength of the branch pipe 520 can be improved, and the probability of fatigue rupture of the branch pipe 520 due to the vibration of the compressor 100, refrigerant impact, etc. can be reduced, 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.

[0056] In addition, using stainless steel material to make at least part of the pipe body of the branch pipe 520 can also reduce the weight of the branch pipe 520, which is also beneficial to realizing the lightweight of the air conditioner.

[0057] Furthermore, using stainless steel material to replace the copper pipe in the related art is also beneficial to reducing costs. It can be understood that in the subsequent embodiments, the beneficial effects regarding cost reduction will not be elaborated anymore.

[0058] In some embodiments, as Figures 1 to 6 shown, the heat source unit 10 further includes a subcooler 530. The subcooler 530 includes a main flow channel 531 and an auxiliary flow channel 532. The main flow channel 531 is connected in series in the first pipe 510, and the auxiliary flow channel 532 is connected in series in the branch pipe 520 to cool the refrigerant in the first pipe 510 with the refrigerant in the branch pipe 520. The auxiliary flow channel 532 is provided with an upstream port 5321 and a downstream port 5322 along the direction from the start end A to the terminal N. At least part of the pipe body of the branch pipe 520 between the downstream port 5322 and at least one terminal N is made of stainless steel material.

[0059] The subcooler 530 is used to realize the heat exchange 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 the heat of the refrigerant in the main flow channel 531 to achieve subcooling. The refrigerant in the main flow channel 531 and the refrigerant in the auxiliary flow channel 532 are arranged in countercurrent. For the first pipe 510, the subcooling degree of the liquid refrigerant can be improved, which is beneficial to improving the refrigeration and heating capacity. For the branch pipe 520, the refrigerant temperature of the first pipe 510 can be recovered, which is beneficial to improving the jet enthalpy increase effect and reducing the probability of liquid hammer.

[0060] Further, referring to Figure 3 and Figure 4, at least a part of the pipe body of the branch pipe 520 located between the downstream port 5322 and at least one terminal N is made of stainless steel material. With such a setting, it is beneficial to improve the fatigue strength of the branch pipe 520 between the subcooler 530 and the terminal N, reduce the probability of fatigue rupture caused by the vibration of the compressor 100, refrigerant impact, etc., thereby being beneficial to improve the fatigue strength and reliability of the heat source unit 10, and further being beneficial to improve the reliability and stability of the air conditioning system.

[0061] In some embodiments, as Figures 1 to 6 shown, the heat source unit 10 further includes an expansion valve 540 disposed 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 inside 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 respectively connected to the first valve connecting pipe 521 and the second valve connecting pipe 522. The valve core is used to control the on-off and / or pipe opening degree 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 material, and / or the first valve body 541 is made of stainless steel material.

[0062] The expansion valve 540 is used to achieve the on-off and / or pipe opening degree between the first valve connecting pipe 521 and the second valve connecting pipe 522, and the expansion valve 540 is disposed between the starting end A and the upstream port 5321. That is to say, the opening degree of the expansion valve 540 can vary from 0 to 100%. In this way, the accuracy of the refrigerant flow rate adjustment of the branch pipe 520 can be further improved.

[0063] The first valve connecting pipe 521 is connected between the first valve body 541 and the starting end A, and inputs high-pressure liquid refrigerant to the first valve body 541; the second valve connecting pipe 522 is connected between the first valve body 541 and the upstream port 5321, and inputs the throttled refrigerant to the subcooler 530. By setting the expansion valve 540, on the one hand, the valve core can change the flow channel cross-sectional area, thereby controlling the refrigerant flow rate of the branch pipe 520 and balancing the refrigerant distribution ratio between the first pipe 510 and the branch pipe 520. On the other hand, the opening and closing of the branch pipe 520 can be realized, and the expansion valve 540 can be used as a cut-off valve. Moreover, when the high-pressure liquid refrigerant flows through the expansion valve 540, it is throttled and depressurized to generate a low-temperature two-phase flow to control the dryness of the output refrigerant, providing a phase change basis for the heat exchange of the subsequent subcooler 530. Thus, it can not only further reduce the probability of liquid slugging of the compressor 100, improve the working reliability and safety, but also be beneficial to improve the working reliability of the subcooler 530.

[0064] Further, at least one of the first valve connection pipe 521 and the second valve connection pipe 522 is made of stainless steel material. With such an arrangement, the fatigue resistance of the branch pipe 520 between the upstream port 5321 and the starting end A can be improved, and the probability of fatigue rupture caused by the vibration of the compressor 100, refrigerant impact, etc. can be reduced, which is beneficial to improving the fatigue resistance and reliability of the heat source unit 10, and further beneficial to improving the reliability and stability of the air conditioning system.

[0065] Further, the first valve body 541 is made of stainless steel material. With such an arrangement, it is also beneficial to improve the fatigue resistance of the expansion valve 540, and further beneficial to improving the reliability and stability of the air conditioning system.

[0066] It can be understood that when the first valve connection pipe 521, the second valve connection pipe 522, and the first valve body 541 are all made of stainless steel material, the thermal expansion coefficients of the same material are consistent, and the probability of refrigerant leakage caused by thermal stress can also be reduced. Optionally, the expansion valve 540 can be an electronic expansion valve.

[0067] In some embodiments, as Figures 1 to 6 shown, both the first valve connection pipe 521 and the second valve connection pipe 522 are made of stainless steel material. One end of the first valve connection pipe 521 is inserted into the wall opening of the first pipe 510, and the other end is directly welded to the first valve body 541 or welded through a copper joint. One end of the second valve connection pipe 522 is directly welded to the first valve body 541 or welded through a copper joint, and the other end is directly welded to the upstream port 5321 or welded through a copper joint.

[0068] In this embodiment, both the first valve connection pipe 521 and the second valve connection pipe 522 are stainless steel connection pipes. Moreover, one end of the first valve connection 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 connection pipe 522 is connected to the first valve body 541, and the other end is connected to the upstream port 5321. That is to say, both sections of the pipe body between the expansion valve 540 and the starting end A and between the expansion valve 540 and the upstream port 5321 are stainless steel pipes. With such an arrangement, it is beneficial to further improve the fatigue resistance and reliability of the branch pipe 520, and further beneficial to improving the reliability and stability of the air conditioning system.

[0069] In addition, one end of the first valve connection pipe 521 can be inserted into the wall opening of the first pipe 510 and then welded to form the starting end A of the branch pipe 520. In this way, it is beneficial to improve the convenience of connecting the first valve connection pipe 521 and the first pipe 510.

[0070] The other end of the first valve connecting pipe 521 can be directly welded to the first valve body 541. Thus, the number of copper joints used can be reduced, the number of weld seams and welding times can be decreased, so that while reducing the welding cost, the welding reliability and stability can be improved. Optionally, the direct welding of the first valve connecting pipe 521 and the first valve body 541 can be completed externally by methods such as furnace brazing and high-frequency welding.

[0071] Alternatively, the other end of the first valve connecting pipe 521 can be welded to the first valve body 541 through 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 copper alloys such as copper-tin alloy and copper-zinc alloy.

[0072] The welding of the copper joint is of relatively low difficulty and can be welded by manual welding. In this case, the other end of the first valve connecting pipe 521 can be welded to the copper joint in advance by methods such as furnace brazing and high-frequency welding. 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, with relatively low requirements for the welding equipment conditions of the factory; when the first valve body 541 is a stainless-steel valve body, a copper joint can also be welded to the first valve body 541 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, and the requirements for the welding equipment conditions of the factory are also relatively low. In this way, the welding of the first valve connecting pipe 521 and the first valve body 541 can be realized based on the existing welding conditions, which is conducive to improving the welding convenience.

[0073] 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. In this way, it is beneficial to reduce the number of copper joints used, reduce the number of weld seams and welding times, so that while reducing the welding cost, the welding reliability and stability can be improved. Optionally, the direct welding of the second valve connecting pipe 522 and the first valve body 541 and the direct welding of the second valve connecting pipe 522 and the upstream port 5321 can be completed externally by methods such as furnace brazing and high-frequency welding.

[0074] Alternatively, one end of the second valve connecting pipe 522 can be welded to the first valve body 541 through a copper joint, and the other end can be welded to the upstream port 5321 through a copper joint. In this way, the welding of the first valve connecting pipe 521 and the first valve body 541 can be realized based on the existing welding conditions, which is conducive to improving the welding convenience.

[0075] In some embodiments, such as Figure 1 and Figure 2As shown, the number of terminals N is one. The terminal N is connected to the injection pipe 110, and at least part of the pipe body of the branch pipe 520 is made of stainless steel material. In this case, the branch pipe 520 is the enthalpy-increasing pipe of the compressor 100. On the one hand, it is beneficial to reduce the exhaust temperature and compression ratio, thereby reducing the compression power consumption and increasing the exhaust volume. On the other hand, it can improve the fatigue strength of the branch pipe 520, reduce the probability of fatigue rupture of the branch pipe 520 due to the vibration of the compressor 100, refrigerant impact, etc., thereby being beneficial to improving the fatigue strength and reliability of the heat source unit 10, and further being beneficial to improving the reliability and stability of the air-conditioning system.

[0076] In some embodiments, as Figure 1 and Figure 2 shown, the heat source unit 10 further includes a silencer 700. The silencer 700 is arranged between the starting end A and the injection pipe 110. Among them, the branch pipe 520 includes a first section of pipe body 520a and a second section of pipe body 520b. The first section of pipe body 520a is located between the starting end A and the silencer 700, and the second section of pipe body 520b is located between the silencer 700 and the injection pipe 110. At least part of the first section of pipe body 520a and / or at least part of the second section of pipe body 520b is made of stainless steel material.

[0077] The silencer 700 can suppress the noise of the refrigerant flow and optimize the stability of the jet enthalpy-increasing process. At the silencer 700, the branch pipe 520 is divided into the first section of pipe body 520a and the second section of pipe body 520b. The first section of pipe body 520a extends from the starting end A to the silencer 700, and the second section of pipe body 520b extends from the silencer 700 to the injection pipe 110.

[0078] The second section of pipe body 520b is close to the compressor 100 and needs to resist the vibration of the compressor 100 and the high-frequency pressure fluctuation of the refrigerant. Making at least part of it made of stainless steel material is beneficial to reducing the probability of fatigue rupture of the branch pipe 520 due to the vibration of the compressor 100, refrigerant impact, etc., and further being beneficial to improving the reliability and stability of the air-conditioning system.

[0079] The first section of pipe body 520a is close to the shunt point of the first pipe 510, and the refrigerant pressure of the first pipe 510 is high. Therefore, the first section of pipe body 520a needs to withstand the impact of high-pressure refrigerant. Making at least part of it made of stainless steel material is beneficial to reducing the probability of fatigue rupture of the branch pipe 520 due to the impact of high-pressure refrigerant, and further being beneficial to improving the reliability and service life of the air-conditioning system.

[0080] In some embodiments, as Figure 1 and Figure 2As shown, the main flow channel 531 of the subcooler 530 is communicated with the first pipeline 510, and the auxiliary flow channel 532 of the subcooler 530 is communicated with the first section of the pipe body 520a, so that the refrigerant in the branch pipeline 520 cools the refrigerant in the first pipeline 510. At least part of the first section of the pipe body 520a located between the downstream port 5322 and the muffler 700 is made of stainless steel material.

[0081] The subcooler 530 is used to increase the subcooling degree of the first pipeline 510, thereby improving the heating and cooling capacity. In this embodiment, the temperature of the refrigerant coming out of the downstream port 5322 of the subcooler 530 will rise. At least part of the first section of the pipe body 520a located between the downstream port 5322 and the muffler 700 is made of stainless steel material. The stainless steel material has good temperature resistance and a low coefficient of thermal expansion, which improves the high-temperature tolerance of the first section of the pipe body 520a, can inhibit the deformation of the pipe body, and reduce the probability of weld cracking between the first section of the pipe body 520a and other components due to thermal stress. In addition, it can also improve the fatigue resistance of the first section of the pipe body 520a, which is also beneficial to improving the reliability and service life of the branch pipeline 520.

[0082] In some embodiments, as Figure 1 , Figure 2 and Figure 7 shown, the heat source unit 10 further includes a control valve 800 provided on the first section of the pipe body 520a. The control valve 800 is used to control the on-off of the first section of the pipe body 520a. The control valve 800 can be, for example, an electromagnetic valve. The muffler 700 includes a muffler housing 710. The outlet end of the control valve 800 is connected to the inlet end of the muffler housing 710. The muffler housing 710 is made of stainless steel material.

[0083] Since the terminal N of the branch pipeline 520 is one and is only connected to the injection interface, the branch pipeline 520 is an enthalpy-increasing pipeline. The control valve 800 can realize the on-off of the first section of the pipe body 520a, and further control the on-off of the entire branch pipeline 520, which is beneficial to improving the flexibility and accuracy of the control of the branch pipeline 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, they can be connected by welding with a copper joint or directly welded. This application does not limit this.

[0084] By setting the muffler housing 710 as a stainless steel housing, it is beneficial to improve the fatigue resistance of the muffler housing 710, and further beneficial to improving the reliability and service life of the branch pipeline 520.

[0085] In some embodiments, as Figure 2 , Figure 7 shown and referring to Figure 8, the second pipe body 520b includes a main pipe body 523, a first copper joint 524 and a second copper joint 525 connected to both 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 material.

[0086] Since the second pipe body 520b is close to the injection pipe 110 of the compressor 100, if the entire second pipe body 520b is a stainless steel pipe, the welding between the second pipe body 520b and the injection pipe 110 is inconvenient. Therefore, the second pipe body 520b of this embodiment includes a main pipe body 523, a first copper joint 524 and a second copper joint 525. The main pipe body 523 is connected to the muffler housing 710 and the injection pipe 110 through the first copper joint 524 and the second copper joint 525 respectively. 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 pipe body 520b and the injection pipe 110 can be directly welded by manual welding, that is, the welding between the second pipe body 520b and the injection pipe 110 can be realized based on the existing welding conditions at the welding site, which is beneficial to improving the welding convenience.

[0087] Optionally, as Figure 7 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, which is beneficial to further improving the welding convenience between the muffler housing 710 and the main pipe body 523.

[0088] Optionally, in some other embodiments, as Figure 8 shown, the stainless steel main pipe body 523 can be directly welded to the outlet end of the muffler housing 710. In this case, it is beneficial to reduce the weld seams, reduce costs, improve the reliability and stability of welding, and reduce the probability of weld seam cracking.

[0089] It should be noted that when the welding equipment meets the requirements, if the pipe bodies of the two parts 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 such as welding temperature, welding time, and welding space during brazing and high-frequency welding. If not, two copper joints need to be used for indirect welding between the stainless steel pipes, that is, copper joints need to be welded to the ends of both stainless steel pipe bodies in advance. Similarly, if the processing site does not have the welding conditions for stainless steel, indirect welding between stainless steel pipes also needs to be carried out through two copper joints.

[0090] In some embodiments, as Figure 2 、 Figure 7 shown and referring toFigure 8 , the main pipe body 523 is sleeved or inserted into the first copper joint 524 and the second copper joint 525. The second copper joint 525 is sleeved or inserted into the injection pipe 110, and the first copper joint 524 is sleeved or inserted into the muffler housing 710. For example, in a specific embodiment, the main pipe body 523 is sleeved with the first copper joint 524 and the second copper joint 525, and the second copper joint 525 is sleeved with the injection pipe 110; the first copper joint 524 is sleeved with the muffler housing 710.

[0091] The main pipe body 523 is sleeved or inserted into the first copper joint 524 so that a part of the main pipe body 523 coincides with a part of the first copper joint 524. In this way, the main pipe body 523 and the first copper joint 524 have stronger structural strength and stronger anti-fatigue strength at the overlapping part.

[0092] Similarly, the main pipe body 523 is sleeved or inserted into the second copper joint 525 so that a part of the main pipe body 523 coincides with a part of the second copper joint 525. In this way, the main pipe body 523 and the second copper joint 525 have stronger structural strength and stronger anti-fatigue strength at the overlapping part.

[0093] Similarly, the second copper joint 525 is sleeved or inserted into the injection pipe 110. In this way, the injection pipe 110 and the second copper joint 525 have stronger structural strength and anti-fatigue strength at the overlapping part.

[0094] Similarly, the first copper joint 524 is sleeved or inserted into the muffler housing 710. In this way, the muffler housing 710 and the first copper joint 524 have stronger structural strength and anti-fatigue strength at the overlapping part.

[0095] Wherein, the insertion depth or the sleeving 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.

[0096] It can be understood that if the insertion depth or the sleeving depth is longer, for example, greater than 30 mm, although the connection strength and the anti-fatigue strength are stronger, the assembly difficulty will increase, and the consumption of the pipe body will increase, resulting in waste and inconvenient assembly. If the insertion depth or the sleeving depth is less than 7 mm, the connection strength and the anti-fatigue strength do not meet the requirements, and at the same time, the positioning length between the pipe bodies is insufficient, and the assembly difficulty will also increase.

[0097] Setting the insertion depth or socket depth within this range can ensure sufficient connection strength and fatigue resistance between the main pipe body 523 and the first copper joint 524, between the main pipe body 523 and the second copper joint 525, between the second copper joint 525 and the injection pipe 110, and between the first copper joint 524 and the muffler housing 710. Moreover, it is conducive to cost reduction and improved assembly convenience. Optionally, the requirements for the insertion depth or socket depth apply to the welding between any two stainless steel pipe bodies and copper pipe bodies.

[0098] In some embodiments, as Figure 9 shown, a first solder layer B1 formed by a first solder is provided at the overlapping portion between the stainless steel pipe S1 (such as the main pipe body 523) and the copper joint S2 (such as the first copper joint 524, the second copper joint 525), and a second solder layer B2 formed by a second solder is provided at the overlapping portion between the copper pipe S3 (such as the interface of the injection pipe 110, the copper muffler housing 710) and the copper joint S2 (such as the first copper joint 524, the second copper joint 525). The melting point of the first solder is higher than that of the second solder.

[0099] This embodiment illustrates the specific welding method between stainless steel - copper - copper. It can be understood that the above combination requires welding in multiple steps. Since the melting point of the first solder is higher than that of the second solder, the stainless steel pipe and the copper joint can be welded together first, and then the copper joint can be welded to other copper - made pipes. Thus, the reliability and stability of the welded connection can be improved.

[0100] Optionally, for welding between stainless steel and stainless steel, and between stainless steel and copper, a furnace welding process can be adopted. In a high - temperature environment, there is hydrogen or hydrogen decomposed from ammonia inside the furnace, and the reducing gas can reduce the oxide film on the outside of the stainless steel, thereby enabling the spread of the filler metal and completing diffusion brazing.

[0101] In some embodiments, the thicknesses of both the first solder layer B1 and the second solder layer B2 are less than or equal to 0.1 mm. For example, 0.1 mm, 0.08 mm, 0.06 mm, or 0.04 mm, etc.

[0102] Generally speaking, the larger the weld, the poorer the corrosion resistance, because stress concentration and micro - cracks are likely to occur at the weld, which will accelerate the corrosion process. The smaller the thicknesses of the first solder layer B1 and the second solder layer B2, the smaller the weld, thus reducing the probability of weld rupture and improving the reliability of refrigerant delivery.

[0103] In some embodiments, knurling or wire drawing is provided between the stainless - steel - made pipe and the copper joint, and knurling or wire drawing is provided between the copper - made pipe and the copper joint, which is conducive to further improving the welding reliability.

[0104] In some embodiments, such as Figure 3 , Figure 4 shown, the number of terminals N is two, namely the first terminal N1 and the second terminal N2 respectively. The first terminal N1 is connected to the injection pipe 110 of the compressor 100, and the second terminal N2 is connected to the suction port 120 of the compressor 100. The branch pipe 520 includes a primary branch pipe 526, and a first branch pipe 527 and a second branch pipe 528 branched from the primary branch pipe 526. The primary branch pipe 526 correspondingly forms a starting end A, the first branch pipe 527 correspondingly forms the first terminal N1, and the second branch pipe 528 correspondingly forms the second terminal N2.

[0105] 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 branched from the primary branch pipe 526. In this way, the primary branch pipe 526 to the first branch pipe 527 constitutes the enthalpy-increasing pipe of the compressor 100, and the primary branch pipe 526 to the second branch pipe 528 constitutes the suction pipe of the compressor 100. With such a setting, on the one hand, it is beneficial to reduce the compression power consumption and increase the exhaust volume. On the other hand, it prevents the liquid slugging condition of the compressor 100 caused by incomplete evaporation of the refrigerant, thereby improving the safety and reliability of the operation of the compressor 100.

[0106] Optionally, the second branch pipe 528 can be first connected to the gas-liquid separator 900, and then the gas-liquid separator 900 is connected to the suction port 120 of the compressor 100. Thus, the connection between the second branch pipe 528 and the suction port 120 is realized.

[0107] Furthermore, in some embodiments, such as Figure 3 , Figure 4 , Figure 10 and Figure 11 shown, at least part of the pipe body of the primary branch pipe 526 is made of stainless steel material. The primary branch pipe 526 is close to the diversion point of the first pipe 510, and the refrigerant pressure of the first pipe 510 is high. Therefore, the primary branch pipe 526 needs to withstand the impact of high-pressure refrigerant. Making at least part of it made of stainless steel material is beneficial to reducing the probability of fatigue rupture of the branch pipe 520 due to the impact of high-pressure refrigerant, and thus is beneficial to improving the reliability and service life of the air-conditioning system.

[0108] In some embodiments, such as Figure 3 , Figure 4 , Figure 10 and Figure 11As shown, at least part of the pipe body of the first manifold 527 is made of stainless steel material. The first manifold 527 is close to the compressor 100 and needs to resist the vibration of the compressor 100 and the high-frequency pressure fluctuation of the refrigerant. Making at least part of it from stainless steel material is conducive to reducing the probability of fatigue rupture of the branch pipe 520 due to the impact of high-pressure refrigerant, and thus conducive to improving the reliability and service life of the air-conditioning system.

[0109] In some embodiments, such as Figure 3 , Figure 4 , Figure 10 and Figure 11 As shown, at least part of the pipe body of the second manifold 528 is made of stainless steel material. The second manifold 528 is also close to the compressor 100 and needs to resist the vibration of the compressor 100 and the high-frequency pressure fluctuation of the refrigerant. Making at least part of it from stainless steel material is conducive to reducing the probability of fatigue rupture of the branch pipe 520 due to the impact of high-pressure refrigerant, and thus conducive to improving the reliability and service life of the air-conditioning system.

[0110] In some embodiments, such as Figure 3 , Figure 4 , Figure 10 and Figure 11 As shown, the silencer 700 is provided on the first manifold 527, and at least part of the pipe body of the first manifold 527 between the silencer 700 and the injection connection pipe 110 is made of stainless steel material.

[0111] The first manifold 527 is connected to the injection connection pipe 110. The first manifold 527 is part of the injection enthalpy increase pipeline, and its pressure is greater than the suction pressure. Installing the silencer 700 on the first manifold 527 can reduce the high-frequency noise during the jet enthalpy increase process. Moreover, setting at least part of the pipe body of the first manifold 527 between the silencer 700 and the injection connection pipe 110 as stainless steel material can improve the fatigue resistance strength of the first manifold 527, adapt to high-pressure injection and extreme temperatures, suppress vibration transmission and fatigue cracking, and thus is conducive to improving the service life and reliability of the enthalpy increase pipeline.

[0112] In some embodiments, such as Figure 3 , Figure 4 and Figure 11 As shown, the silencer 700 includes a silencer housing 710 made of stainless steel material. The heat source unit 10 further includes a first control valve 810 provided on the first manifold 527, and the outlet end of the first control valve 810 is connected to the inlet end of the silencer housing 710. It can be understood that the first control valve 810 is the Figures 1 to 2 control valve 800 in the embodiment shown in

[0113] By setting the first control valve 810, the on-off of the first manifold 527 can be achieved, thereby controlling the on-off of the entire enthalpy-increasing pipeline. Thus, it is beneficial to save energy consumption. The outlet end of the first control valve 810 and the inlet end of the muffler housing 710 can be connected by soldering with a copper joint or directly by soldering. This application does not limit this.

[0114] In some embodiments, as Figure 3 , Figure 4 , Figure 10 and Figure 11 shown, the heat source unit 10 includes a second control valve 820. The second control valve 820 is arranged on the second manifold 528, and the second control valve 820 is used to control the on-off of the second manifold 528. By setting the second control valve 820, the on-off of the second manifold 528 can be achieved, thereby controlling the on-off of the return air pipeline of the branch pipeline 520. Thus, it is beneficial to save energy consumption. In addition, by setting the first control valve 810 and the second control valve 820, the distribution ratio of the refrigerant between the first manifold 527 and the second manifold 528 can also be flexibly adjusted, optimizing the suction state of the compressor 100 and the injection enthalpy-increasing effect, so as to balance the system energy efficiency and reliability.

[0115] Furthermore, at least part of the pipe body of the second manifold 528 between the second control valve 820 and the return air port 120 is made of stainless steel material. Thus, the fatigue resistance of the second manifold 528 can be improved, which is beneficial to improving the service life and reliability of the return air pipeline of the branch pipeline 520.

[0116] In some embodiments, as Figure 10 and Figure 12 shown, the second manifold 528 includes a first section 5281 and a second section 5282. The heat source unit 10 further includes a three-way valve 550, a charging valve 560 and a charging pipe 570. One end of the first section 5281 is communicated with the primary branch pipeline 526, and the other end is communicated with the inlet end of the second control valve 820. One end of the charging pipe 570 is communicated with the charging valve 560, and the other end is communicated with the first port of the three-way valve 550. The second port of the three-way valve 550 is communicated with the outlet end of the second control valve 820. One end of the second section 5282 is communicated with the third port of the three-way valve 550, and the other end is communicated with the return air port 120. Among them, at least part of the pipe bodies of the first section 5281, the second section 5282 and the charging pipe 570 are made of stainless steel material, and / or at least part of the three-way valve 550 is made of stainless steel material.

[0117] In this embodiment, the second manifold 528 is integrated with a three-way valve 550, a charging valve 560, and a second control valve 820, thereby dividing the second manifold 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, another port is connected to the second section 5282, and the first section 5281 is connected to the inlet end of the second control valve 820. That is to say, the first section 5281 is the refrigerant inlet pipe of the second manifold 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 externally connected to a refrigerant charging device for refrigerant charging or recovery. A 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, and the second section 5282 is connected to the third port of the three-way valve 550 to direct the refrigerant to the suction port 120.

[0118] When the second control valve 820 is opened, the three-way valve 550 can make the first port and the second port conduct, so that the refrigerant can be recovered through the charging valve 560; or, the three-way valve 550 can make the second port and the third port conduct, so that the second manifold 528 conveys the refrigerant to the suction port 120.

[0119] When the second control valve 820 is closed, the three-way valve 550 can make the first port and the third port conduct, so that the refrigerant can be charged into the system through the charging valve 560; or, the three-way valve 550 can make the third port non-conducting, so that the second manifold 528 stops conveying the refrigerant. Thus, various functions such as refrigerant charging, recovery, and start / stop of the second manifold 528 can be achieved.

[0120] Further, at least part of the pipe bodies of the first section 5281, the second section 5282, and the charging pipe 570 are made of stainless steel material. With such a setting, it is beneficial to improve the fatigue resistance of the second manifold 528 and the charging pipe 570, thereby being beneficial to improving the service life and reliability of the suction pipe and the charging pipe of the branch pipe 520.

[0121] Further, at least part of the three-way valve 550 is made of stainless steel material. Thus, it is beneficial to improve the strength and reliability of the three-way valve 550, and further beneficial to improving the service life and reliability of the three-way valve 550.

[0122] In some embodiments, as Figure 7 shown, the heat source unit 10 further includes a filter assembly disposed in the silencer 700. The filter assembly includes a clamp 43 and a filter screen 42. The filter screen 42 is installed on the clamp 43, the clamp 43 is installed in the silencer 700, the filter screen 42 is made of stainless steel material, and / or the clamp 43 is made of stainless steel material.

[0123] The filter screen 42 can filter impurities in the refrigerant medium, preventing the impurities in the refrigerant medium from entering the compressor 100 and the gas-liquid separator. In this embodiment, the filter screen 42 is configured as a stainless steel filter screen, which is beneficial to improving the service life and reliability of the filter screen 42.

[0124] To increase the contact area between the filter screen 42 and the refrigerant medium, the filter screen 42 includes a circular bottom and a circumferential side portion in the shape of an inverted frustum, and the bottom is fixed to the end with a smaller diameter of the inverted frustum.

[0125] Furthermore, the filter screen 42 is fixed to the inside of the muffler 700 via a clamp 43, realizing the detachable connection between the filter screen 42 and the muffler 700, which is also beneficial to improving the convenience of disassembling and replacing the filter screen 42.

[0126] Furthermore, the material of the clamp 43 is stainless steel, which is beneficial to improving the service life and reliability of the clamp 43.

[0127] Such as Figure 1 and Figure 3 As shown, in a second aspect, an air conditioner 1 provided by an embodiment of the present application includes the heat source unit 10 described in the first aspect. With such a setting, the probability of fatigue rupture of the branch pipe 520 due to the vibration of the compressor 100, refrigerant impact, etc. can be reduced, which is beneficial to improving the anti-fatigue strength and reliability of the heat source unit 10, and further beneficial to improving the reliability and stability of the air conditioner.

[0128] In the drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components; in the description of the present application, it should be understood that if there are terms such as "upper", "lower", "left", "right", etc. indicating the orientation or positional relationship, it is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the drawings are only for illustrative purposes and cannot be understood as a limitation to the present application. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0129] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope 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 with the load heat exchanger through external pipelines; 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 is connected to the heat source heat exchanger and the liquid side external interface; The branch pipe has a starting end and at least one terminal end, the starting end is connected to the first pipe, and the at least one terminal end is connected to the injection pipe of the compressor and / or the return air port of the compressor. At least part of the pipe body of the branch pipe is made of stainless steel.

2. The heat source unit according to claim 1, characterized in that 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; 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 part of the pipe body of the branch pipe between the downstream port and the at least one terminal end is made of stainless steel material.

3. The heat source unit according to claim 2, characterized in that: 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; 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 a stainless steel material, and / or the first valve body is made of a stainless steel material.

4. The heat source unit according to claim 3, characterized in that: 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 by welding through a copper joint, and the other end is directly connected to the upstream port by welding or by welding through a copper joint.

5. The heat source unit according to claim 1, characterized in that The number of the terminal is one, and the terminal is connected to the injection nozzle of the compressor; At least a portion of the pipe body of the branch pipe is made of stainless steel.

6. The heat source unit according to claim 5, characterized in that The heat source unit further includes a muffler, which is arranged between the starting end and the injection pipe; 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; At least a portion of the first tube section and / or at least a portion of the second tube section is made of stainless steel.

7. The heat source unit according to claim 6, characterized in that: 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 communicated with the first pipe, and the auxiliary flow channel is communicated with 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 part of the first section of the pipe body located between the downstream port and the muffler is made of stainless steel material.

8. The heat source unit according to claim 6, characterized in that The heat source unit further comprises a control valve disposed on the first section of the pipe body, the control valve being used to control the on and off of the first section of the pipe body; 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 material.

9. The heat source unit according to claim 8, characterized in that: 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. The main pipe body is made of stainless steel.

10. The heat source unit according to claim 9, characterized in that The main pipe is sleeved or plugged with the first copper joint and the second copper joint, the second copper joint is sleeved or plugged with the injection pipe, and the first copper joint is sleeved or plugged with 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.

11. The heat source unit according to claim 1, characterized in that: The number of the terminals is two, which are respectively a first terminal and a second terminal; The first terminal is connected to the injection pipe of the compressor, 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, wherein, At least part of the pipe body of the primary branch pipe is made of stainless steel; And / or, at least a portion of the first branch pipe is made of stainless steel; And / or, at least a portion of the second branch pipe is made of stainless steel.

12. The heat source unit according to claim 11, characterized in that The heat source unit includes a muffler, which is arranged on the first branch pipe. At least a part of the pipe body of the first branch pipe located between the muffler and the injection pipe is made of stainless steel.

13. The heat source unit according to claim 12, characterized in that: The muffler comprises a muffler shell, and the muffler shell is made of stainless steel material; The heat source unit further includes a first control valve, which is disposed on the first branch pipe, and an outlet end of the first control valve is connected to an inlet end of the muffler housing.

14. The heat source unit according to claim 11, characterized in that The heat source unit includes a second control valve, which is arranged on the second branch pipe and is used to control the on-off of the second branch pipe; At least a portion of the pipe body of the second branch pipe located between the second control valve and the air return port is made of stainless steel.

15. The heat source unit according to claim 14, characterized in that: The second branch pipe includes a first section and a second section; The heat source unit also includes a three-way valve, a filling valve and a filling pipe; 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; One end of the filling pipe is in communication with the filling valve, and the other end is in communication with the first port of the three-way valve; 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; Wherein, the first section, the second section, at least a part of the tube body of the filling tube are made of stainless steel material, and / or at least a part of the three-way valve is made of stainless steel material.

16. The heat source unit according to claim 6 or 12, characterized in that: Also included is a filter assembly disposed in the muffler, the filter assembly comprising a clamp and a filter screen, the filter screen is installed on the clamp, and the clamp is installed in the muffler; The filter screen is made of stainless steel material, and / or the clamp is made of stainless steel material.

17. An air conditioner, characterized in that: Comprising the heat source unit according to any one of claims 1-16.

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