External circulation device of heat pump economizer and heat pump economizer

Abstract

The utility model relates to the field of economizers, in particular to an external circulation device of a heat pump economizer and the heat pump economizer, and the external circulation device comprises a main path outlet connecting pipe, an auxiliary valve inlet connecting pipe and a branch pipe. The main path outlet connecting pipe is connected with a body of the heat pump economizer, and the auxiliary valve inlet connecting pipe is connected with an auxiliary path electronic expansion valve of the heat pump economizer. The branch pipe comprises a first pipeline and a second pipeline. The first pipeline is connected with an outlet of the main path outlet connecting pipe, the second pipeline is connected with the auxiliary valve inlet connecting pipe, the second pipeline is connected to a connecting hole formed in the side wall of the first pipeline, and the connecting hole is formed in the bottom of the first pipeline. The main path outlet connecting pipe is used for discharging a coolant, and the coolant can be accumulated at the bottom of the first pipeline, flows into the second pipeline through the connecting hole and then enters the auxiliary valve inlet connecting pipe. Cooling liquid in the coolant can be accumulated at the bottom of the first pipeline under the action of gravity, flows through the second pipeline through the connecting hole and enters the auxiliary road electronic expansion valve.

Description

Technical Field

[0001] This patent relates to the field of economizers, and in particular to an external circulation device and a heat pump economizer. Background Technology

[0002] The economizer plays a crucial role in a heat pump system, primarily optimizing refrigerant flow and state transitions to improve the overall system's energy efficiency ratio and stability. Specifically, the economizer separates a portion of the high-pressure liquid refrigerant entering the evaporator. This separated refrigerant then undergoes throttling and pressure reduction via an auxiliary electronic expansion valve. During this process, the refrigerant absorbs heat from the main circuit and undergoes a phase change, transforming from a liquid to a gaseous state before entering the compressor. This process not only increases the compressor's discharge volume at low temperatures but also effectively reduces the discharge temperature, helping to protect the compressor and extend its lifespan.

[0003] Meanwhile, because the high-pressure liquid refrigerant in the main circuit exchanges heat with the auxiliary circuit at the economizer, some of the heat from the refrigerant in the main circuit is absorbed by the auxiliary circuit, thus achieving a subcooling effect. This subcooling state helps to improve the heat exchange efficiency of the evaporator, thereby improving the cooling or heating performance of the entire heat pump system.

[0004] However, in actual production and application, to simplify system layout and save costs, most manufacturers choose to draw refrigerant directly from the top or side of the main copper pipe. While this reduces material and installation costs to some extent, it introduces new problems. Due to the change in the refrigerant draw location, the refrigerant drawn from the auxiliary circuit may no longer be completely liquid, but rather a gas-liquid mixture or even a completely gaseous state. In this state, the refrigerant's throttling, pressure reduction, and heat absorption effects are significantly reduced after entering the economizer, resulting in a substantial decrease in the economizer's efficiency. Utility Model Content

[0005] To solve, or at least partially solve, the aforementioned technical problems, this patent provides an external circulation device for a heat pump economizer, comprising: a main outlet pipe, an auxiliary valve inlet pipe, and branch pipes. The main outlet pipe is connected to the body of the heat pump economizer, and the auxiliary valve inlet pipe is connected to the auxiliary electronic expansion valve of the heat pump economizer. The branch pipes include: a first pipe and a second pipe. The first pipe is connected to the outlet of the main outlet pipe. The second pipe is connected to the auxiliary valve inlet pipe, and the second pipe is connected to a connection hole opened on the side wall of the first pipe, with the connection hole located at the bottom of the first pipe. The main outlet pipe is used to discharge coolant, which can accumulate at the bottom of the first pipe and flow into the second pipe through the connection hole, thereby entering the auxiliary valve inlet pipe.

[0006] Preferably, the angle between the first pipeline and the second pipeline is 90°-120°.

[0007] Preferably, the edges of the connecting hole are rounded.

[0008] Preferably, a cooling device is wrapped around the outer surface of the second pipe to reduce the temperature of the second pipe.

[0009] Preferably, the external circulation device further includes: a main valve inlet connector. The main valve inlet connector is connected to the main electronic expansion valve of the heat pump economizer. The branch pipe also includes: a third pipe. The third pipe is connected to the main valve inlet connector, and coolant that does not flow into the second pipe passes through the third pipe and enters the main valve inlet connector.

[0010] Preferably, the other end of the third pipe is connected to the first pipe, and a flow-blocking surface that gradually slopes upward along the flow direction of the coolant is provided on the inner wall of the connection between the third pipe and the first pipe. The flow-blocking surface guides part of the coolant to flow back and enter the second pipe.

[0011] Preferably, the heat pump economizer also includes:

[0012] The auxiliary electronic expansion valve is connected to the end of the auxiliary valve inlet pipe furthest from the second pipeline. The auxiliary electronic expansion valve is used to reduce the temperature and pressure of the coolant.

[0013] This application also discloses a heat pump economizer, which includes the aforementioned external circulation device. The heat pump economizer further includes an economizer body. The economizer body includes a housing, a main pipeline, and an auxiliary pipeline. The main pipeline and auxiliary pipeline are disposed within the housing, and heat exchange occurs between them to reduce the temperature of the main pipeline. The main pipeline is connected to a main outlet pipe, and the auxiliary pipeline is connected to an auxiliary electronic expansion valve. The auxiliary electronic expansion valve is connected to the end of the main valve inlet pipe furthest from the third pipeline, and is used to reduce the temperature and pressure of the coolant.

[0014] Preferably, the heat pump economizer also includes a main inlet pipe. The main inlet pipe is connected to the casing and communicates with the main pipeline, guiding the refrigerant after leaving the condenser into the main pipeline.

[0015] Preferably, the heat pump economizer also includes: an auxiliary outlet pipe and a temperature sensing sleeve. The auxiliary outlet pipe is connected to the housing and communicates with the auxiliary pipeline, and guides the coolant after heat exchange to the compressor; the temperature sensing sleeve is fitted onto the auxiliary outlet pipe.

[0016] Compared to existing technologies, this application utilizes a branch pipe to divert the coolant flowing out of the economizer body. While the coolant is mostly liquid, a small portion may remain gaseous. The auxiliary circuit in the economizer, used to reduce the pressure of the main circuit, requires liquid coolant for heat exchange. The liquid coolant deposited at the bottom of the first branch pipe flows into the second branch pipe through a connection hole, and then enters the auxiliary circuit electronic expansion valve. The cooled and depressurized coolant in the auxiliary circuit further cools the coolant in the main circuit, increasing the compressor's discharge capacity while simultaneously reducing the temperature of the coolant entering the evaporator, achieving subcooling. Attached Figure Description

[0017] To more clearly illustrate the embodiments of this patent, the relevant drawings will be briefly described below. It should be understood that the drawings described below are only for illustrating some embodiments of this patent, and those skilled in the art can obtain many other technical features and connections not mentioned herein based on these drawings.

[0018] Figure 1 This is a schematic diagram of the structure of a heat pump economizer according to an embodiment of this patent;

[0019] Figure 2 This is a schematic diagram of the structure of a branch pipe according to an embodiment of this patent.

[0020] Explanation of reference numerals in the attached figures:

[0021] 1. Main inlet pipe; 2. Auxiliary electronic expansion valve; 3. Main valve inlet connector; 4. Main electronic expansion valve; 5. Branch pipe; 51. First pipeline; 511. Connection hole; 52. Second pipeline; 53. Third pipeline; 54. Flow-blocking surface; 6. Auxiliary valve inlet connector; 7. Main outlet connector; 8. Auxiliary outlet connector; 9. Economizer body; 10. Temperature sensing sleeve; 11. Auxiliary valve outlet connector. Detailed Implementation

[0022] Unless otherwise defined, the technical or scientific terms used in this specification and claims shall have the ordinary meaning as understood by one of ordinary skill in the art to which this application pertains.

[0023] All the values ​​listed in this article, ranging from the lowest to the highest, refer to all values ​​obtained by incrementing the lowest and highest values ​​by one unit when the difference between the lowest and highest values ​​is more than two units.

[0024] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0025] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0026] The patent will now be described in detail with reference to the accompanying drawings.

[0027] At present, the function of the economizer is to separate a portion of the high-pressure liquid refrigerant entering the evaporator, reduce its pressure through the electronic expansion valve in the refrigerant circuit, absorb heat from the main circuit, and turn it into a gaseous state to enter the compressor. This increases the compressor's discharge volume at low temperatures and lowers the discharge temperature. Since the high-pressure liquid refrigerant in the main circuit has absorbed heat from the auxiliary circuit at the economizer, it can also achieve the purpose of subcooling.

[0028] Currently, most manufacturers draw refrigerant directly from the top or side of the main copper pipe to save on copper tubing. This results in the refrigerant circuit receiving a mixture of liquid and gas, or even a completely gaseous refrigerant, instead of a completely liquid one, which significantly reduces the efficiency of the economizer.

[0029] In view of this, the first embodiment of this patent proposes a biopsy sample collection device to solve the above-mentioned technical problems.

[0030] First Implementation Method

[0031] refer to Figure 1 and Figure 2This patent provides an external circulation device for a heat pump economizer, including: a main outlet pipe 7, an auxiliary valve inlet pipe 6, and branch pipes. The main outlet pipe 7 is connected to the body of the heat pump economizer, and the auxiliary valve inlet pipe 6 is connected to the auxiliary electronic expansion valve 2 of the heat pump economizer. The branch pipes include: a first pipe 51 and a second pipe 52. The first pipe 51 is connected to the outlet of the main outlet pipe 7. The second pipe 52 is connected to the auxiliary valve inlet pipe 6 and is connected to a connection hole 511 opened on the side wall of the first pipe 51, and the connection hole 511 is located at the bottom of the first pipe 51. The main outlet pipe 7 is used to discharge coolant, which can accumulate at the bottom of the first pipe 51 and flow into the second pipe 52 through the connection hole 511, thereby entering the auxiliary valve inlet pipe 6.

[0032] When the economizer is operating, the coolant that originally left the condenser needs to be diverted. A small portion of the coolant flows into the auxiliary circuit, while the remainder continues to flow in the main circuit. The coolant flowing into the auxiliary circuit is cooled and depressurized to allow it to exchange heat with the coolant newly flowing into the main circuit from the economizer, thus allowing the coolant in the main circuit to be cooled and subcooled again. Therefore, when diverting the coolant, the coolant first leaves the economizer body 9 through the main circuit outlet connector 7, and then enters the first branch pipe 51. Since most of the liquid coolant will settle at the bottom, under the influence of gravity, this liquid portion settled at the bottom will flow into the connection hole 511, then through the second pipe 52 into the auxiliary valve inlet connector 6, and finally reach the auxiliary circuit electronic expansion valve 2. The auxiliary circuit electronic expansion valve 2 cools and depressurizes the coolant. Considering that the coolant may contain some gaseous components, and that the auxiliary electronic expansion valve 2 primarily handles the liquid portion during cooling and depressurization (since the liquid portion accumulates at the bottom of the coolant), it can be inferred that the liquid portion will also settle at the bottom of the first pipe 51. This means that all coolant entering the second pipe 52 through the connection hole 511 and leading to the auxiliary electronic expansion valve 2 is liquid. Utilizing this principle not only ensures the consistency of coolant properties entering the auxiliary electronic expansion valve 2 but also improves the efficiency of the auxiliary cooling and depressurization process.

[0033] Furthermore, the angle between the first pipe 51 and the second pipe 52 is 90°-120°.

[0034] When the coolant flows from the economizer and into the first pipe 51, its liquid portion needs to be diverted to the second pipe 52. The angle between the first pipe 51 and the second pipe 52 plays a crucial role in this process. First, this angle helps utilize gravity to allow the coolant to flow along the second pipe 52, thereby improving the system's natural convection effect. Second, by adjusting the angle, the coolant flow rate can be effectively controlled, preventing pressure loss due to excessive flow or reduced heat exchange efficiency due to insufficient flow. Furthermore, a larger angle helps reduce bubble formation, as gas tends to accumulate at the top of the pipe and be expelled through the venting device, thus avoiding airlock. In conclusion, a reasonable pipe layout and angle setting are essential to ensuring that the coolant can enter the auxiliary electronic expansion valve 2 efficiently and stably. This not only helps improve the overall performance of the refrigeration system but also extends the equipment's service life.

[0035] In addition, the edges of the opening of the connecting hole 511 are rounded.

[0036] Since the liquid coolant in the first pipe 51 needs to enter the second pipe 52 through the connection hole 511, the rounded corner design at the edges plays a crucial role. This design not only helps to smoothly guide a portion of the liquid in the first pipe 51 into the second pipe 52, but also reduces the possibility of the coolant being blocked during the flow. The advantage of the rounded corner design is that it can significantly reduce the resistance to fluid flow and avoid turbulence and pressure loss caused by sharp edges. In addition, this design can also prevent cavitation when the fluid flows at high speeds, thus protecting the pipes from damage. Liquid coolant is very important for the refrigeration cycle because it has a higher heat capacity and better heat transfer performance than gaseous coolant. Therefore, ensuring that sufficient liquid coolant enters the auxiliary electronic expansion valve 2 is essential for maintaining the efficient operation of the system. In addition to the rounded corner design, other measures such as increasing the pipe diameter can be taken to further reduce the resistance of the fluid in the pipes, thereby improving the efficiency of the entire system.

[0037] Meanwhile, a cooling device is attached and wrapped around the outer surface of the second pipe 52 to reduce the temperature of the second pipe 52.

[0038] Since the temperature of the liquid portion of the coolant is usually slightly lower than that of the gaseous portion, and the gaseous coolant can be converted into a liquid state upon cooling, some gaseous coolant may enter the second pipe 52 when the coolant enters from the first pipe 51 due to insufficient temperature. At this time, under the action of the external refrigeration device in the second pipe 52, this gaseous coolant can be cooled and converted into a liquid state to meet the liquid coolant requirement of the auxiliary electronic expansion valve 2, thus preventing gaseous coolant from accidentally entering the auxiliary electronic expansion valve 2. Specifically, a thermoelectric cooler can be selected to reduce the temperature of the second pipe 52. The thermoelectric cooler operates using the Peltier effect, that is, when current passes through a circuit composed of two different conductors, heat is absorbed at one end and released at the other. By changing the direction of the current, heating or cooling effects can be achieved. This technology is widely used in small refrigeration equipment. The auxiliary electronic expansion valve 2 is mainly used to regulate the amount of liquid coolant entering the evaporator to control the temperature and humidity at the evaporator outlet. It achieves this by precisely controlling the valve opening.

[0039] At the same time, refer to Figure 2 The external circulation device also includes: a main valve inlet connector 3. The main valve inlet connector 3 is connected to the main electronic expansion valve 4 of the heat pump economizer. The branch pipe also includes: a third pipe 53. The third pipe 53 is connected to the main valve inlet connector 3, and the coolant that does not flow into the second pipe 52 passes through the third pipe 53 and enters the main valve inlet connector 3.

[0040] When a heat pump economizer is in use, its primary purpose is to provide sufficient low-temperature, low-pressure refrigerant to the main evaporator. Therefore, before entering the main evaporator for heat exchange, the refrigerant in the main circuit flows through the first pipe 51 and then into the third pipe 53, ultimately entering the main circuit electronic expansion valve 4. The main circuit electronic expansion valve 4 cools and depressurizes the refrigerant in the main circuit, ensuring that the refrigerant in the main circuit meets the temperature requirements of the evaporator.

[0041] In addition, refer to Figure 2 The other end of the third pipe 53 is connected to the first pipe 51. On the inner wall of the connection between the third pipe 53 and the first pipe 51, there is a flow-blocking surface 54 that gradually extends upward along the flow direction of the coolant. The flow-blocking surface 54 guides part of the coolant to flow back and enter the second pipe 52.

[0042] Because the coolant in the first pipe 51 needs to pass through the connection hole 511, some coolant flows from the first pipe 51 into the second pipe 52, and then into the third pipe 53. The main purpose of the branch pipe is to ensure that the auxiliary electronic expansion valve 2 receives a sufficient supply of coolant. Therefore, a flow-blocking surface 54 is provided at the connection between the first pipe 51 and the third pipe 53. This allows some coolant to flow back and through the connection hole 511 to the second pipe 52, thereby ensuring that more liquid coolant smoothly enters the second pipe 52 and provides sufficient liquid coolant to the auxiliary electronic expansion valve 2.

[0043] Finally, refer to Figure 1 The heat pump economizer shown also includes: an auxiliary electronic expansion valve 2, which is connected to the end of the auxiliary valve inlet pipe 6 away from the second pipe 52. The auxiliary electronic expansion valve 2 is used to reduce the temperature and pressure of the coolant.

[0044] The auxiliary electronic expansion valve 2 reduces the pressure of the refrigerant by regulating its flow rate. Specifically, by precisely controlling the refrigerant flow rate, it ensures that the refrigerant in the evaporator evaporates at the appropriate pressure and temperature, thereby improving the overall system's cooling efficiency. Furthermore, the auxiliary electronic expansion valve 2 also has system protection functions. For example, it can prevent the compressor discharge temperature from becoming too high. When the auxiliary electronic expansion valve 2 stops, it is in the closed state, which reduces the entry of high-temperature liquid into the air conditioner condenser, thus avoiding excessive heat loss and enabling a light-load start-up of the compressor. Because the auxiliary electronic expansion valve 2 can precisely control the refrigerant flow rate, it can improve the energy efficiency ratio of the refrigeration system. This means that under the same cooling capacity, the system consumes less energy, making it more energy-efficient and environmentally friendly.

[0045] Second Implementation Method

[0046] refer to Figure 1 The second embodiment of this application also discloses a heat pump economizer, which includes the aforementioned heat pump economizer external circulation device. The heat pump economizer further includes an economizer body 9. The economizer body 9 includes a housing, a main pipeline, and an auxiliary pipeline. The main pipeline and the auxiliary pipeline are disposed within the housing, and heat exchange occurs between them to reduce the temperature of the main pipeline. The main pipeline is connected to a main pipeline outlet connector 7, and the auxiliary pipeline is connected to an auxiliary pipeline electronic expansion valve 2. The auxiliary pipeline electronic expansion valve 4 is connected to the end of the main valve inlet connector 3 furthest from the third pipeline 53, and is used to reduce the temperature and pressure of the coolant.

[0047] The housing of the economizer body 9 protects the main and auxiliary pipelines located inside to prevent damage to both. Liquid refrigerant in the main pipeline exits the condenser and enters the housing directly through the main pipeline. Simultaneously, within the housing, the liquid refrigerant in the main pipeline absorbs heat from the low-temperature, low-pressure refrigerant in the auxiliary pipeline, thus further subcooling it. The subcooled liquid refrigerant then undergoes throttling and pressure reduction through the main electronic expansion valve 4 before entering the evaporator. Specifically, during main pipeline subcooling, the refrigerant originally located in the main pipeline is guided through a branch pipe, flowing via the second branch pipe 52 into the auxiliary electronic expansion valve 2. After throttling and pressure reduction by the auxiliary electronic expansion valve 2, the refrigerant enters the auxiliary pipeline located inside the housing through the auxiliary valve outlet connector 11. The refrigerant in the auxiliary pipeline, having undergone throttling and pressure reduction, can exchange heat with the refrigerant in the main pipeline, absorbing its heat. Finally, the evaporated refrigerant gas is drawn into the compressor's auxiliary inlet to participate in the compression cycle.

[0048] Specifically, the heat pump economizer also includes: main inlet pipe 1. Main inlet pipe 1 is connected to the casing and communicates with the main pipeline. Main inlet pipe 1 guides the coolant after leaving the condenser into the main pipeline.

[0049] Since the refrigerant in the main pipeline of the economizer body 9 comes from the condenser, the main pipeline inlet pipe 1 can inject the refrigerant, which is formed by the high-temperature and high-pressure refrigerant discharged from the compressor in the condenser being cooled and condensed by steam, into the economizer. The refrigerant is the main component of the economizer's operation. The refrigerant will be divided into two parts in the economizer, flowing in the auxiliary pipeline and the main pipeline respectively, in order to improve the cooling efficiency while reducing the compressor's discharge temperature.

[0050] Finally, the heat pump economizer also includes: auxiliary outlet pipe 8 and temperature sensing sleeve 10. Auxiliary outlet pipe 8 is connected to the housing and communicates with the auxiliary pipeline. Auxiliary outlet pipe 8 guides the coolant after heat exchange to the compressor; temperature sensing sleeve 10 is fitted on auxiliary outlet pipe 8.

[0051] The auxiliary outlet pipe 8 is connected to the housing, discharging the coolant inside the housing, after heat exchange with the main pipe in the auxiliary pipe, to the outside of the housing. Subsequently, the coolant is delivered to the compressor through the auxiliary outlet pipe 8. A temperature-sensing sleeve 10 is fitted onto the auxiliary outlet pipe 8. The temperature-sensing sleeve 10, also known as a thermometer protective sleeve or thermocouple protective sleeve, is a device fitted over the temperature-sensing element. Its main function is to protect the temperature-sensing element from harmful environmental media, ensuring the accuracy and stability of the measurement. This sleeve is typically made of high-temperature and corrosion-resistant materials such as stainless steel or carbon steel to adapt to different working environments. It not only withstands the pressure and corrosion of the measured medium, preventing the temperature-sensing element from being directly exposed to harsh environments, thus extending the service life of the temperature-sensing element, but also makes the entire process more convenient and efficient when the temperature-sensing element needs maintenance or replacement, thanks to the presence of the temperature-sensing sleeve 10. The entire temperature measurement system does not need to be disassembled; only the temperature-sensing element inside the sleeve needs to be replaced. Furthermore, proper installation of the temperature-sensing sleeve 10 is crucial to ensuring its functionality. For example, it should be avoided to install it in places with high vibration, so as not to affect the accuracy of temperature measurement.

[0052] Finally, it should be noted that those skilled in the art will understand that many technical details have been presented in the embodiments of this patent to facilitate a better understanding of the invention. However, even without these technical details and various variations and modifications based on the above embodiments, the technical solutions claimed in the claims of this patent can be substantially achieved. Therefore, in practical applications, various changes can be made to the above embodiments in form and detail without departing from the spirit and scope of this patent.

Claims

1. An external circulation device for a heat pump economizer, characterized in that, include: The main outlet pipe is connected to the body of the heat pump economizer; The auxiliary valve inlet pipe is connected to the auxiliary electronic expansion valve of the heat pump economizer; Branch pipes include: The first pipeline is connected to the outlet of the main pipeline outlet pipe; The second pipeline is connected to the auxiliary valve inlet pipe. The second pipeline is connected to the connection hole opened on the side wall of the first pipeline, and the connection hole is located at the bottom of the first pipeline. The main outlet pipe is used to discharge coolant, which can accumulate at the bottom of the first pipe and flow into the second pipe through the connection hole, thereby entering the auxiliary valve inlet pipe.

2. The external circulation device of the heat pump economizer according to claim 1, characterized in that, The angle between the first pipeline and the second pipeline is 90°-120°.

3. The external circulation device of the heat pump economizer according to claim 1, characterized in that, The edges of the connecting hole are rounded.

4. The external circulation device of the heat pump economizer according to claim 1, characterized in that, A cooling device is attached and wrapped around the outer surface of the second pipe to reduce the temperature of the second pipe.

5. The external circulation device of the heat pump economizer according to claim 1, characterized in that, The external circulation device also includes: The main valve inlet pipe is connected to the main electronic expansion valve of the heat pump economizer; The branch pipe also includes: The third pipeline is connected to the main valve inlet connector. The coolant that does not flow into the second pipeline passes through the third pipeline and enters the main valve inlet connector.

6. The external circulation device of the heat pump economizer according to claim 5, characterized in that, The other end of the third pipeline is connected to the first pipeline; On the inner wall of the connection between the third pipeline and the first pipeline, there is a flow-blocking surface that gradually slopes upward along the flow direction of the coolant. The flow-blocking surface guides part of the coolant backflow and into the second pipeline.

7. The external circulation device of the heat pump economizer according to claim 1, characterized in that, The heat pump economizer also includes: An auxiliary electronic expansion valve is connected to the end of the auxiliary valve inlet pipe away from the second pipeline. The auxiliary electronic expansion valve is used to reduce the temperature and pressure of the coolant.

8. A heat pump economizer, characterized in that, The heat pump economizer includes the heat pump economizer external circulation device as described in claim 5. The heat pump economizer also includes: The economic device body includes: Shell, main pipeline and auxiliary pipeline; The main pipeline and the auxiliary pipeline are disposed within the housing, and heat exchange occurs between the main pipeline and the auxiliary pipeline to reduce the temperature of the main pipeline. The main pipeline is connected to the main pipeline outlet pipe, and the auxiliary pipeline is connected to the auxiliary pipeline electronic expansion valve; The main electronic expansion valve is connected to the end of the main valve inlet pipe away from the third pipeline. The main electronic expansion valve is used to reduce the temperature and pressure of the coolant.

9. The heat pump economizer according to claim 8, characterized in that, The heat pump economizer also includes: The main inlet pipe is connected to the housing and communicates with the main pipeline. The main inlet pipe guides the coolant after it leaves the condenser into the main pipeline.

10. The heat pump economizer according to claim 8, characterized in that, The heat pump economizer also includes: The auxiliary outlet pipe is connected to the housing and communicates with the auxiliary pipeline. The auxiliary outlet pipe guides the coolant after heat exchange to the compressor. A temperature-sensing sleeve is fitted onto the auxiliary road outlet pipe.

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