Multi-split heat pump system

Abstract

The invention relates to the technical field of cooling and heating equipment, in particular to a multi-split heat pump system, and aims to solve the problem that the heating effect becomes poor due to the fact that a liquid refrigerant with a low temperature is reserved in a gas-liquid separator in an existing multi-split heat pump system and the exhaust temperature is lower than 60 DEG C after a compressor sucks the liquid refrigerant with the low temperature. In order to achieve the purpose, the heat pump system comprises a gas-liquid separator, a compressor, an evaporator, a heat exchanger and a branch circulation structure which are connected. The branch circulation structure comprises a branch pipe and a surrounding structure; the surrounding structure is arranged on the outer wall of the gas-liquid separator, the branch pipe is connected with the first pipeline and the surrounding structure, and part of the refrigerant enters the surrounding structure, so that the liquid refrigerant in the gas-liquid separator is heated. By arranging the branch pipe and the surrounding structure, a part of refrigerant before entering the heat exchanger enters the branch pipe and the surrounding structure, so that the liquid refrigerant with lower temperature in the gas-liquid separator is heated, the exhaust temperature of the compressor can exceed 70 DEG C, and the heating effect is excellent.

Description

Technical Field

[0001] The invention relates to the technical field of cooling and heating equipment, and specifically provides a multi-connected heat pump system. Background Art

[0002] During the heating process of a multi-split heat pump system, the exhaust temperature of the compressor should generally exceed 70°C so that the heating effect will be obvious. However, during the heating process, liquid refrigerant with a slightly lower temperature after being processed by the condenser will remain inside the gas-liquid separator. When the compressor inhales the liquid refrigerant with a slightly lower temperature, the exhaust temperature of the compressor will be lower than 60°C, causing the heating effect to deteriorate.

[0003] Accordingly, the art needs a new multi-split heat pump system to solve the above problems. Summary of the invention

[0004] The present invention aims to solve the above technical problem, that is, to solve the problem that the gas-liquid separator in the existing multi-split heat pump system retains liquid refrigerant with a slightly lower temperature. When the compressor inhales the liquid refrigerant with a slightly lower temperature, the exhaust temperature of the compressor is lower than 60°C, resulting in a poor heating effect.

[0005] The present invention provides a multi-split heat pump system, which includes a gas-liquid separator, a compressor, an evaporator, a heat exchanger and a branch circulation structure; the gas-liquid separator is connected to the compressor, the compressor is connected to the evaporator, and the evaporator and the heat exchanger are connected through a first pipeline so that the refrigerant enters the heat exchanger; the branch circulation structure includes a branch pipe and a surrounding structure; the surrounding structure is arranged on the outer wall of the gas-liquid separator, and the branch pipe is respectively connected to the first pipeline and the surrounding structure so that a part of the refrigerant enters the surrounding structure, so that the liquid refrigerant inside the gas-liquid separator is heated.

[0006] In the preferred technical solution of the above-mentioned multi-split heat pump system, the multi-split heat pump system also includes a controller and a temperature sensor; the temperature sensor is installed on the exhaust port of the compressor to obtain the exhaust temperature of the compressor, and the temperature sensor is connected to the controller to feed back the obtained information to the controller.

[0007] In the preferred technical solution of the above-mentioned multi-split heat pump system, the multi-split heat pump system also includes a control valve, which is installed on the branch pipe and connected to the controller, and the controller is configured to control the control valve to open or close according to the acquired exhaust temperature of the compressor.

[0008] In the preferred technical solution of the above-mentioned multi-split heat pump system, when the controller monitors that the exhaust temperature of the compressor drops below the first set temperature, the controller controls the control valve to open so as to heat the outside of the gas-liquid separator; when the exhaust temperature of the compressor rises to the second set temperature, the controller controls the control valve to be opened continuously for a period of time, and then the controller controls the control valve to be closed; when the exhaust temperature of the compressor is between the third set temperatures, the controller controls the control valve to be opened continuously so as to continuously heat the outside of the gas-liquid separator.

[0009] In the preferred technical solution of the above multi-split heat pump system, the multi-split heat pump system further includes a fourth pipeline, one end of the fourth pipeline is connected to the compressor, and the other end of the fourth pipeline is connected to the gas-liquid separator.

[0010] In the preferred technical solution of the above-mentioned multi-split heat pump system, the surrounding structure includes a tube body, a first joint and a second joint; the tube body is wrapped around the outer wall of the gas-liquid separator and fits tightly; the first joint is integrally formed on one end of the tube body and connected to the branch pipe; the second joint is integrally formed on the other end of the tube body and connected to the fourth pipeline.

[0011] In the preferred technical solution of the multi-split heat pump system, the tube body is a flat tube.

[0012] In the preferred technical solution of the above-mentioned multi-split heat pump system, the multi-split heat pump system also includes a condenser and a second pipeline, one end of the second pipeline is connected to the condenser, and the other end of the second pipeline is connected to the heat exchanger so that the refrigerant enters the condenser.

[0013] In the preferred technical solution of the above-mentioned multi-split heat pump system, the multi-split heat pump system also includes a third pipeline, one end of the third pipeline is connected to the condenser, and the other end of the third pipeline is connected to the gas-liquid separator so that the cooled refrigerant enters the gas-liquid separator.

[0014] In the preferred technical solution of the above multi-split heat pump system, the evaporator and the compressor are connected via a fifth pipeline.

[0015] In the case of adopting the above technical solution, the multi-split heat pump system of the present application connects the branch pipe and the first pipeline so that a part of the refrigerant before entering the heat exchanger enters the branch pipe, and the surrounding structure is arranged on the outer wall of the gas-liquid separator and fits tightly. The surrounding structure and the branch pipe are connected so that the refrigerant enters the interior of the surrounding structure, so that the gas-liquid separator is heated from the outside to the inside, and the liquid refrigerant with a slightly lower temperature inside is heated and vaporized, so that the exhaust temperature of the compressor can exceed 70°C, and the heating effect is excellent. At the same time, the problem of liquid hammer in the compressor caused by the liquid refrigerant with a slightly lower temperature remaining in the gas-liquid separator is solved. It also solves the problem that due to the suction of the outdoor fan, a large amount of condensed water on the outdoor heat exchanger will be sprayed into the interior of the outdoor unit, especially on the gas-liquid separator. When the condensed water encounters the gas-liquid separator with liquid refrigerant, the outside of the gas-liquid separator will be frozen, affecting its service life.

[0016] Furthermore, a control valve is provided in the multi-split heat pump system of the present invention, the control valve is installed on the branch pipe and connected to the controller, and the controller is configured to control the control valve to open or close according to the exhaust temperature of the compressor. By providing the control valve, it can be opened and closed when the branch circulation structure is needed to realize automatic control.

[0017] Furthermore, the surrounding structure in the multi-split heat pump system of the present invention includes a pipe body, a first joint and a second joint. The pipe body is wound around the outer circumference of the gas-liquid separator and fits tightly with the outer wall of the gas-liquid separator. The first joint is integrally formed on one end of the pipe body and connected to the branch pipe. The second joint is integrally formed on the other end of the pipe body and connected to the fourth pipeline. The liquid refrigerant enters the branch pipe through the connection between the first joint and the branch pipe. The pipe body can conduct heat to the gas-liquid separator, so that the liquid refrigerant inside the gas-liquid separator is heated and gasified. In this way, the exhaust temperature of the compressor can exceed 70°C, improving the heating effect. The second joint sends the liquid refrigerant into the fourth pipeline for continued use. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings, in which:

[0019] Figure 1 It is a structural block diagram of a multi-split heat pump system of the present invention;

[0020] Figure 2 It is a structural schematic diagram of a surrounding structure of a multi-split heat pump system of the present invention.

[0021] List of symbols in the figure:

[0022] 1. Heat exchanger; 2. Second pipeline; 3. Condenser; 4. Third pipeline; 5. Gas-liquid separator; 6. Fourth pipeline; 7. Compressor; 8. Fifth pipeline; 9. Evaporator; 10. Control valve; 11. Branch pipe; 12. Surrounding structure; 13. First pipeline; 121. Pipe body; 122. First joint; 123. Second joint. DETAILED DESCRIPTION

[0023] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principle of the multi-split heat pump system of the present invention, and are not intended to limit the protection scope of the present invention.

[0024] It should be noted that in the description of the present invention, the terms "upper", "lower", "inner", "outer" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0025] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "disposed" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, an indirect connection through an intermediate medium, or the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] During the heating process of a multi-split heat pump system, the exhaust temperature of the compressor should generally exceed 70°C so that the heating effect will be obvious. However, during the heating process, liquid refrigerant with a slightly lower temperature after being processed by the condenser will remain inside the gas-liquid separator. When the compressor inhales the liquid refrigerant with a slightly lower temperature, the exhaust temperature of the compressor will be lower than 60°C, causing the heating effect to deteriorate.

[0027] In order to solve the above problems, the present application provides a multi-split heat pump system, which includes a gas-liquid separator 5, a compressor 7, an evaporator 9, a heat exchanger 1 and a branch circulation structure. The gas-liquid separator 5 is connected to the compressor 7, the compressor 7 is connected to the evaporator 9, and the evaporator 9 is connected to the heat exchanger 1 through a first pipeline 13 so that the refrigerant enters the heat exchanger 1. The branch circulation structure includes a branch pipe 11 and a surrounding structure 12. The surrounding structure 12 is arranged on the outer wall of the gas-liquid separator 5, and the branch pipe 11 is respectively connected to the first pipeline 13 and the surrounding structure 12 so that a part of the refrigerant enters the surrounding structure, so that the liquid refrigerant inside the gas-liquid separator is heated.

[0028] The technical solution of the present application connects the branch pipe 11 and the first pipeline 13, so that a part of the refrigerant before entering the heat exchanger 1 enters the branch pipe 11, and the surrounding structure 12 is arranged on the outer wall of the gas-liquid separator 5 and fits tightly. The surrounding structure 12 and the branch pipe 11 connect the refrigerant to enter the interior of the surrounding structure 12, so that the gas-liquid separator 5 heats the liquid refrigerant with a slightly lower temperature inside from the outside to the inside to heat and vaporize it, so that the exhaust temperature of the compressor 7 can exceed 70°C, and the heating effect is excellent. At the same time, it solves the problem of liquid hammer of the compressor 7 caused by the liquid refrigerant with a slightly lower temperature remaining in the gas-liquid separator 5. It also solves the problem that due to the suction of the outdoor fan, a large amount of condensed water on the outdoor heat exchanger 1 will be sprayed into the interior of the outdoor unit, especially on the gas-liquid separator 5. When the condensed water encounters the gas-liquid separator 5 with liquid refrigerant, the outside of the gas separator will be frozen, which will affect its service life.

[0029] Combine the following Figure 1 and Figure 2 The multi-split heat pump system of the present application is described. Figure 1 As shown, the first aspect of the present invention provides a multi-split heat pump system, which generally includes a gas-liquid separator 5, a compressor 7, an evaporator 9, a heat exchanger 1 and a branch circulation structure. The gas-liquid separator 5 is connected to the compressor 7, the compressor 7 is connected to the evaporator 9, and the evaporator 9 is connected to the heat exchanger 1 through a first pipeline 13 so that the refrigerant enters the heat exchanger 1. The branch circulation structure generally includes a branch pipe 11 and a surrounding structure 12. The surrounding structure 12 is arranged on the outer wall of the gas-liquid separator 5, and the branch pipe 11 is respectively connected to the first pipeline 13 and the surrounding structure 12 so that a part of the refrigerant enters the surrounding structure 12, so that the liquid refrigerant inside the gas-liquid separator 5 is heated.

[0030] In this way, by connecting the branch pipe 11 and the first pipeline 13, a part of the refrigerant before entering the heat exchanger 1 enters the branch pipe 11, and the surrounding structure 12 is arranged on the outer wall of the gas-liquid separator 5 and fits tightly. The surrounding structure 12 and the branch pipe 11 are connected so that the refrigerant enters the interior of the surrounding structure 12, so that the gas-liquid separator 5 is heated from the outside to the inside by heating the liquid refrigerant with a slightly lower temperature inside. In this way, the exhaust temperature of the compressor 7 can exceed 70°C, and the heating effect is excellent.

[0031] Specifically, the length, thickness and material of the branch pipe 11 can be determined according to actual needs. One end of the branch pipe 11 is connected to the first pipeline 13 through a tee, wherein the first pipeline 13 is cut into a first section and a second section, the first channel of the tee is connected to the first end of the first section, the second channel of the tee is connected to the first end of the second section, the third channel of the tee is connected to one end of the branch pipe 11, the second end of the first section is sealed to the inlet of the heat exchanger 1, and the second end of the second section is sealed to the outlet end of the evaporator 9.

[0032] It should be noted that the heat exchanger 1, the compressor 7, the evaporator 9 and the gas-liquid separator 5 are all existing ones, and the difference between the gas-liquid separator 5 and the existing ones is that a surrounding structure 12 is added to the outside thereof.

[0033] In a preferred embodiment of the multi-split heat pump system, the multi-split heat pump system further includes a controller (not shown in the figure) and a temperature sensor (not shown in the figure). The temperature sensor is installed on the exhaust port of the compressor 7 to obtain the exhaust temperature of the compressor 7, and the controller is connected to the temperature sensor to feed back the obtained information to the controller. By setting the temperature sensor, the temperature on the exhaust port of the compressor 7 can be obtained, so that the branch circulation structure set on the gas-liquid separator 5 can be opened and closed according to the temperature.

[0034] Specifically, the controller is preferably a PLC controller. The temperature sensor is an existing temperature sensor, which is installed on the exhaust port of the compressor 7 and can obtain the temperature of the exhaust port of the compressor 7 to facilitate the control of the branch circulation structure to open and close.

[0035] More specifically, the temperature sensor and the compressor 7 can be connected via a line or a wireless signal. Wherein, the signal sending end of the temperature sensor is connected to the signal receiving end of the controller, and the temperature sensor is used to obtain the temperature on the exhaust port of the compressor 7 and send the temperature to the controller.

[0036] In an embodiment, the temperature sensor is fixed to the exhaust port of the compressor 7 by bolts to facilitate disassembly and replacement. The temperature sensor can be set on the edge of the exhaust port of the compressor 7, or 3-5 cm inside the exhaust port of the compressor 7, and can be set according to actual needs.

[0037] It should be noted that the above-mentioned controller can be a controller in the air conditioner or a separately added controller, which can be determined according to actual conditions.

[0038] like Figure 2As shown, in the preferred embodiment of the multi-split heat pump system, the multi-split heat pump system further includes a control valve 10, which is installed on the branch pipe 11 and connected to the controller, and the controller is configured to control the control valve 10 to open or close according to the exhaust temperature of the compressor 7. By setting the control valve 10, it can be opened and closed when the branch circulation structure is needed to realize automatic control.

[0039] In this embodiment, when the system in the controller monitors that the exhaust temperature of the compressor 7 drops below the first set temperature, the controller controls the control valve 10 to open so as to heat the outside of the gas-liquid separator 5. When the exhaust temperature of the compressor 7 rises to the second set temperature, the controller controls the control valve 10 to open for a period of time, and then controls the control valve 10 to close. When the exhaust temperature of the compressor 7 is between the third set temperature, the controller controls the control valve 10 to open all the time to continue to heat the outside of the gas-liquid separator 5. The first set temperature is generally 60 degrees Celsius, the second set temperature is generally 75 degrees Celsius, the continuous opening period is generally 2 minutes, and the third set temperature is generally between 60-75 degrees.

[0040] Specifically, the control valve 10 and the controller can be connected by line or by wireless signal. The signal receiving end of the control valve 10 is connected to the signal sending end of the controller. The control valve 10 is an existing control valve.

[0041] It should be noted that the control valve 10 is a solenoid valve, and may also be other types of valves, as long as it can be connected to a controller and opened and closed under the control of the controller.

[0042] In this embodiment, the control valve 10 can be installed at multiple positions of the branch pipe 11, for example: the control valve 10 is installed at the side of the connection between the branch pipe 11 and the first pipeline 13, which is used to control the refrigerant to enter the surrounding structure. The control valve 10 can also be installed in the middle of the branch pipe 11, so that the refrigerant in the first pipeline 13 can first enter a part of the branch pipe 11, which can shorten the time for the refrigerant to enter the surrounding structure, thereby accelerating the heating and gasification of the liquid refrigerant inside the gas-liquid separator 5, so that the exhaust temperature of the compressor 7 can exceed 70°C, improving the heating effect. The control valve 10 can also be installed at the side of the connection between the branch pipe 11 and the gas-liquid separator 5, so that the refrigerant in the first pipeline 13 can first enter the branch pipe 11, further shortening the time for the refrigerant to enter the surrounding structure, so as to accelerate the heating and gasification of the liquid refrigerant inside the gas-liquid separator 5, so that the exhaust temperature of the compressor 7 can exceed 70°C, improving the heating effect.

[0043] like Figure 2As shown, in the preferred embodiment of the multi-split heat pump system, the multi-split heat pump system includes a fourth pipeline 6, one end of the fourth pipeline 6 is connected to the compressor 7, and the other end of the fourth pipeline 6 is connected to the gas-liquid separator 5. The gas-liquid separator 5 is connected to the compressor 7 by setting the fourth pipeline 6, so that the refrigerant gas of the gas-liquid separator 5 is subjected to the compressor 7.

[0044] Specifically, one end of the fourth pipeline 6 is a threaded end, which is inserted into the inlet of the compressor 7 and connected by threads, and a sealing gasket and a waterproof sealing strip are provided on the threaded end to improve the sealing performance of the connection between one end of the fourth pipeline 6 and the compressor 7 to prevent leakage. The other end of the fourth pipeline 6 is also a threaded end, which is inserted into the outlet of the gas-liquid separator 5 and connected by threads, and a sealing gasket and a waterproof sealing strip are also provided on the threaded end to improve the sealing performance of the connection between the other end of the fourth pipeline 6 and the gas-liquid separator 5 to prevent leakage.

[0045] It should be noted that the length, thickness and material of the fourth pipeline can be determined according to requirements.

[0046] like Figure 1 As shown, in the preferred embodiment of the multi-split heat pump system, the heat exchanger 1 is a plate heat exchanger. The use of a plate heat exchanger has the advantage of high heat exchange efficiency.

[0047] Specifically, the plate heat exchanger is a high-efficiency heat exchanger made of a series of metal sheets with a certain corrugated shape. Thin rectangular channels are formed between various plates, and heat is exchanged through the plates. It has the characteristics of high heat exchange efficiency, low heat loss, compact and light structure, small footprint, wide application, and long service life. Under the same pressure loss, its heat transfer coefficient is 3-5 times higher than that of the tube heat exchanger, and the footprint is one-third of that of the tube heat exchanger, and the heat recovery rate can be as high as 90% or more.

[0048] like Figure 2 As shown, in the preferred embodiment of the multi-split heat pump system, the surrounding structure generally includes a tube body 122, a first joint 121 and a second joint 123. The tube body 122 is wound around the outer circumference of the gas-liquid separator 5 and is tightly fitted with the outer wall of the gas-liquid separator 5. The first joint 12 is integrally formed on one end of the tube body 122 and connected to the branch pipe 11. The second joint 123 is integrally formed on the other end of the tube body 122 and connected to the fourth pipeline 6. The liquid refrigerant enters the branch pipe 11 through the connection between the first joint 121 and the branch pipe 11. The tube body 122 can conduct heat to the gas-liquid separator 5, so that the liquid refrigerant inside the gas-liquid separator 5 is heated, so that the exhaust temperature of the compressor 7 can exceed 70°C, and the heating effect is excellent. The second joint 123 sends the liquid refrigerant into the fourth pipeline 6 for continued use.

[0049] Specifically, the first joint 121 has a thread for connecting with the branch pipe 11, which is convenient for disassembly, assembly, maintenance and replacement, and the length of the first joint 121 can be determined according to demand. The second joint 123 has a thread for connecting with the fourth pipeline 6, which is convenient for disassembly, assembly, maintenance and replacement, and the length of the second joint 123 can be determined according to demand. The tube body 122 is preferably a flat tube, which can increase the contact area between the tube body 122 and the gas-liquid separator 5 and improve the heating speed of the gas-liquid separator 5.

[0050] It should be noted that the materials of the tube body 122 , the first joint 121 and the second joint 123 can be determined according to actual needs.

[0051] In this embodiment, the surrounding structure can also be other structural forms, for example: the surrounding structure includes a cylinder, a first annular plate, a second annular plate, a third joint and a fourth joint. Among them, the cylinder is sleeved on an outer section of the gas-liquid separator 5, the first annular plate is also sleeved on the gas-liquid separator 5 and is sealed and welded to the corresponding part of the outer wall of the gas-liquid separator 5 and one end of the cylinder, and the second annular plate is also sleeved on the gas-liquid separator 5 and is sealed and welded to the corresponding part of the outer wall of the gas-liquid separator 5 and the other end of the cylinder, so that the cylinder, the first annular plate, the second annular plate and the outer wall of the gas-liquid separator 5 form a cavity, which is used for a part of the refrigerant before entering the heat exchanger 1 to enter the cavity, so that the heating area of ​​the gas-liquid separator 5 is increased and the heating efficiency of the gas-liquid separator 5 is improved. A connecting through hole is opened on the first annular plate, the third joint is sealed and connected to the connecting through hole, and the third joint is sealed and connected to the connecting end of the branch pipe 11. Another connecting through hole is opened on the second annular plate, the fourth joint is sealed and connected to the connecting through hole, and the fourth joint is sealed and connected to the fourth pipeline 6. By providing the above-mentioned surrounding structure, the heating efficiency of the gas-liquid separator 5 is increased.

[0052] It should be noted that the materials of the cylinder, the first annular plate, the second annular plate, the third joint and the fourth joint can be determined according to actual needs.

[0053] like Figure 1 As shown, in the preferred embodiment of the multi-split heat pump system, the multi-split heat pump system further includes a condenser 3 and a second pipeline 2, wherein one end of the second pipeline 2 is connected to the condenser 3, and the other end of the second pipeline 2 is connected to the heat exchanger 1, so that the refrigerant enters the condenser 3. By providing the condenser 3, the refrigerant is changed from a high-pressure and high-temperature gaseous refrigerant to a high-pressure and normal-temperature liquid refrigerant, and enters the gas-liquid separator 5 through the second pipeline 2.

[0054] Specifically, the function of condenser 3 is mainly to cool the refrigerant. The high-pressure and high-temperature refrigerant gas discharged from the compressor enters the condenser coil on the outdoor side, and is cooled by the outdoor temperature airflow driven by the fan, so that the refrigerant changes from a high-pressure and high-temperature gaseous refrigerant to a high-pressure and normal-temperature liquid refrigerant. At this time, the condenser outlet temperature is approximately between 35 and 45 degrees, and the optimal temperature is below 40 degrees.

[0055] In this embodiment, one end of the second pipeline 2 is a threaded end, which is inserted into the inlet of the condenser 3 and connected by threads, and a sealing gasket and a waterproof sealing strip are provided on the threaded end to improve the sealing performance of the connection between the one end of the second pipeline 2 and the condenser 3 to prevent leakage. The other end of the second pipeline 2 is also a threaded end, which is inserted into the outlet of the heat exchanger 1 and connected by threads, and a sealing gasket and a waterproof sealing strip are provided on the threaded end to improve the sealing performance of the connection between the other end of the second pipeline 2 and the heat exchanger 1 to prevent leakage.

[0056] It should be noted that the length, thickness, and material of the second pipeline 2 can be determined according to actual needs.

[0057] like Figure 1 As shown, in the preferred embodiment of the multi-split heat pump system, the multi-split heat pump system further includes a third pipeline 4, one end of the third pipeline 4 is connected to the condenser 3, and the other end of the third pipeline 4 is connected to the gas-liquid separator 5, so that the cooled refrigerant enters the gas-liquid separator 5. By providing the condenser 3 and the gas-liquid separator 5, the refrigerant is changed from a high-pressure and high-temperature gaseous refrigerant to a high-pressure and normal-temperature liquid refrigerant and enters the gas-liquid separator 5 through the second pipeline 2.

[0058] In this embodiment, one end of the third pipeline 4 is a threaded end, which is inserted into the outlet of the condenser 3 and connected by threads, and a sealing gasket and a waterproof sealing strip are provided on the threaded end to improve the sealing performance of the connection between one end of the third pipeline 4 and the condenser 3 to prevent leakage. The other end of the third pipeline 4 is also a threaded end, which is inserted into the inlet of the gas-liquid separator 5 and connected by threads, and a sealing gasket and a waterproof sealing strip are provided on the threaded end to improve the sealing performance of the connection between the other end of the third pipeline 4 and the gas-liquid separator 5 to prevent leakage.

[0059] It should be noted that the length, thickness, and material of the third pipeline 4 can be determined according to actual needs.

[0060] like Figure 1 As shown, in a preferred embodiment of the multi-split heat pump system, the evaporator 9 and the compressor 7 are connected via a fifth pipeline 8 .

[0061] In this embodiment, one end of the fifth pipeline 8 is a threaded end, which is inserted into the outlet of the compressor 7 and connected by threads, and a sealing gasket and a waterproof sealing strip are provided on the threaded end to improve the sealing performance of the connection between the one end of the fifth pipeline 8 and the compressor 7 to prevent leakage. The other end of the fifth pipeline 8 is also a threaded end, which is inserted into the inlet of the evaporator 9 and connected by threads, and a sealing gasket and a waterproof sealing strip are provided on the threaded end to improve the sealing performance of the connection between the other end of the fifth pipeline 8 and the evaporator 9 to prevent leakage.

[0062] It should be noted that the length, thickness and material of the fifth pipeline 8 can be determined according to actual needs.

[0063] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A multi-split heat pump system, characterized in that: The multi-split heat pump system includes a gas-liquid separator, a compressor, an evaporator, a heat exchanger and a branch circulation structure; The gas-liquid separator is connected to the compressor, the compressor is connected to the evaporator, and the evaporator is connected to the heat exchanger through a first pipeline so that the refrigerant enters the heat exchanger; The branch circulation structure includes a branch pipe and a surrounding structure; The surrounding structure is arranged on the outer wall of the gas-liquid separator, and the branch pipes are respectively connected to the first pipeline and the surrounding structure so that a part of the refrigerant enters the surrounding structure to heat and vaporize the liquid refrigerant inside the gas-liquid separator.

2. The multi-split heat pump system according to claim 1, characterized in that: The multi-split heat pump system also includes a controller and a temperature sensor; The temperature sensor is installed on the exhaust port of the compressor to obtain the exhaust temperature of the compressor. The temperature sensor is connected to the controller to feed back the obtained information to the controller.

3. The multi-split heat pump system according to claim 2, characterized in that: The branch circulation structure also includes a control valve, which is installed on the branch pipe and connected to the controller. The controller is configured to control the control valve to open or close according to the acquired exhaust temperature of the compressor.

4. The multi-split heat pump system according to claim 3, characterized in that: When the controller monitors that the exhaust temperature of the compressor drops below a first set temperature, the controller controls the control valve to open so as to heat the outside of the gas-liquid separator; When the exhaust temperature of the compressor rises to a second set temperature, the controller controls the control valve to be opened for a period of time, and then the controller controls the control valve to be closed; When the exhaust temperature of the compressor is between the third set temperatures, the controller controls the control valve to be always open to continuously heat the outside of the gas-liquid separator.

5. The multi-split heat pump system according to claim 1, characterized in that: The multi-split heat pump system further includes a fourth pipeline, one end of which is connected to the compressor, and the other end of which is connected to the gas-liquid separator.

6. The multi-split heat pump system according to claim 5, characterized in that: The surrounding structure includes a tube body, a first joint and a second joint; The tube body is wound around the outer wall of the gas-liquid separator and fits tightly, the first joint is integrally formed on one end of the tube body and connected to the branch pipe, and the second joint is integrally formed on the other end of the tube body and connected to the fourth pipeline.

7. The multi-split heat pump system according to claim 6, characterized in that: The tube body is a flat tube.

8. The multi-split heat pump system according to claim 1, characterized in that: The multi-split heat pump system further includes a condenser and a second pipeline, one end of the second pipeline is connected to the condenser, and the other end of the second pipeline is connected to the heat exchanger so that the refrigerant enters the condenser.

9. The multi-split heat pump system according to claim 8, characterized in that: The multi-split heat pump system also includes a third pipeline, one end of which is connected to the condenser, and the other end of which is connected to the gas-liquid separator, so that the cooled refrigerant enters the gas-liquid separator.

10. The multi-split heat pump system according to claim 1, characterized in that: The evaporator and the compressor are connected via a fifth pipeline.

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