A heat pump compressor package and low temperature heating system

Abstract

The application discloses a heat pump compressor unit and a low-temperature heating system, and the unit comprises the following: the first end of a compressor is connected with the first end of a four-way valve; the second end of the four-way valve is connected with the first end of a plate exchanger through a main pipeline and a first branch pipeline; the second end of the plate exchanger is connected with the first end of a main valve through a plate exchanger output pipeline; the second end of the main valve is connected with the first end of an evaporator; the second end of the main valve is connected with the first end of an evaporating machine; the second end of the evaporating machine is connected with the third end of the four-way valve; the fourth end of the four-way valve is connected with the first end of a heating gas-liquid separator; the second end of the heating gas-liquid separator is connected with the second end of the compressor; the second end of the four-way valve is connected with the plate exchanger output pipeline through the main pipeline and a second branch pipeline; the second branch pipeline passes through the heating gas-liquid separator; and an electromagnetic valve is arranged on the second branch pipeline. The application avoids liquid hammer phenomenon of the compressor, avoids damage of the compressor in low-temperature operation, prolongs the operation life of the heat pump compressor unit and reduces the maintenance cost.

Description

Technical Field

[0001] This invention relates to the field of heat pump compressor unit technology, and more particularly to a heat pump compressor unit and a low-temperature heating system. Background Technology

[0002] In existing heat pump compressor units, the gas flowing into the gas-liquid separator is usually directly transferred to the compressor for secondary circulation. However, the gas flowing into the gas-liquid separator is prone to being mixed with some liquid, which can cause liquid slugging in the compressor and damage it. Summary of the Invention

[0003] This invention provides a heat pump compressor unit and a low-temperature heating system to avoid liquid slugging in the compressor, prevent damage to the compressor during low-temperature operation, improve the service life of the heat pump compressor unit, and reduce maintenance costs.

[0004] According to one aspect of the present invention, a heat pump compressor unit is provided, the heat pump compressor unit comprising:

[0005] Compressor, four-way valve, plate heat exchanger, main valve, evaporator, heating gas-liquid separator, solenoid valve, plate heat exchanger connecting pipeline, plate heat exchanger output pipeline, ambient temperature sensor and control module; the plate heat exchanger connecting pipeline includes main pipeline, first branch pipeline and second branch pipeline.

[0006] The first end of the compressor is connected to the first end of the four-way valve, and the second end of the four-way valve is connected to the first end of the plate heat exchanger through the main pipeline and the first branch pipeline. The compressor is used to transfer the compressed high-temperature gas to the plate heat exchanger through the four-way valve.

[0007] The second end of the plate heat exchanger is connected to the first end of the main valve through the plate heat exchanger output pipeline. The second end of the main valve is connected to the first end of the evaporator. The plate heat exchanger is used to exchange heat between the received high-temperature gas and the coolant, converting it into a high-temperature liquid, and then transmitting it to the main valve.

[0008] The second end of the main valve is connected to the first end of the evaporator. The main valve is used to reduce the flow rate of the high-temperature liquid so that the high-temperature liquid is converted into a low-temperature liquid and then transferred to the evaporator.

[0009] The second end of the evaporator is connected with the third end of the four-way valve, the fourth end of the four-way valve is connected with the first end of the heating gas-liquid separator, and the second end of the heating gas-liquid separator is connected with the second end of the compressor; the second end of the four-way valve is connected with the plate heat exchanger output pipeline through the main pipeline and the second branch pipeline, and the second branch pipeline passes through the heating gas-liquid separator, and the solenoid valve is arranged on the side close to the main pipeline; the evaporator is used for heat exchange between the low-temperature liquid and the air outside the environment, and the low-temperature gas is converted and transmitted to the heating gas-liquid separator through the four-way valve to exchange heat with the high-temperature gas in the second branch pipeline; the heating gas-liquid separator is used for transmitting the low-temperature gas after heat exchange back to the compressor.

[0010] The ambient temperature sensor is connected with the control module, and is used for detecting the ambient temperature outside the environment in real time and transmitting the ambient temperature to the control module; the control module is used for controlling the working state of the solenoid valve according to the ambient temperature.

[0011] Further, the heat pump compressor unit further comprises:

[0012] a water supply module, an exhaust temperature sensor and a water inlet temperature sensor;

[0013] The exhaust temperature sensor is connected with the control module, and is arranged on the outlet side of the compressor; the exhaust temperature sensor is used for detecting the exhaust temperature of the compressor in real time and transmitting the exhaust temperature to the control module.

[0014] The first end of the water supply module is connected with the third end of the plate heat exchanger, and the second end of the water supply module is connected with the fourth end of the plate heat exchanger; the water supply module is used for providing cooling liquid for the plate heat exchanger.

[0015] The water inlet temperature sensor is connected with the control module, and is used for detecting the first temperature of the cooling liquid flowing into the plate heat exchanger in real time and transmitting the first temperature to the control module.

[0016] The control module is used for controlling the working state of the solenoid valve according to the exhaust temperature when the ambient temperature outside the environment is greater than a preset temperature; and the control module is used for controlling the working state of the solenoid valve according to the first temperature when the ambient temperature outside the environment is less than or equal to the preset temperature.

[0017] Further, the control module is used for:

[0018] controlling the solenoid valve to be opened for a first preset time when the ambient temperature outside the environment is greater than or equal to the preset temperature and the exhaust temperature is less than an exhaust preset temperature.

[0019] controlling the solenoid valve to be opened when the ambient temperature outside the environment is less than the preset temperature and the first temperature is less than a preset water inlet temperature.

[0020] Further, the control module is used for:

[0021] The operating status of the main valve is controlled based on the exhaust temperature and the first temperature.

[0022] Furthermore, the control module is used for:

[0023] The temperature difference is determined by taking the difference between the exhaust temperature and the first temperature.

[0024] The temperature difference is compared with the preset temperature difference, and the working state of the main valve is controlled according to the comparison result.

[0025] Furthermore, the heat pump compressor unit also includes:

[0026] Enthalpy-increasing plate heat exchanger, enthalpy-increasing output pipeline and auxiliary valve; the enthalpy-increasing output pipeline includes the main enthalpy-increasing output pipeline, the first enthalpy-increasing branch pipeline and the second enthalpy-increasing branch pipeline;

[0027] The second end of the plate heat exchanger is connected to the first end of the enthalpy-increasing plate heat exchanger through the plate heat exchanger output pipeline. The second end of the enthalpy-increasing plate heat exchanger is connected to the first end of the main valve through the enthalpy-increasing output main pipeline and the first enthalpy-increasing branch pipeline. The second end of the enthalpy-increasing plate heat exchanger is connected to the first end of the auxiliary valve through the enthalpy-increasing output main pipeline and the second enthalpy-increasing branch pipeline. The second end of the auxiliary valve is connected to the third end of the enthalpy-increasing plate heat exchanger. The fourth end of the enthalpy-increasing plate heat exchanger is connected to the third end of the compressor.

[0028] The enthalpy-increasing plate heat exchanger is used to reduce the flow rate of the high-temperature liquid flowing into the second enthalpy-increasing branch, so that the high-temperature liquid is converted into a low-temperature liquid, and the low-temperature liquid is transferred to the enthalpy-increasing plate heat exchanger; the enthalpy-increasing plate heat exchanger is used to exchange heat between the low-temperature liquid flowing in from the third end and the high-temperature liquid flowing in from the first end, converting it into a low-temperature gas, which then flows into the compressor.

[0029] Furthermore, the control module is used for:

[0030] The operating status of the auxiliary valve is controlled based on the exhaust temperature and the first temperature.

[0031] Furthermore, the control module is used for:

[0032] The temperature difference is determined by taking the difference between the exhaust temperature and the first temperature.

[0033] The temperature difference is compared with the preset temperature difference, and the working state of the auxiliary valve is controlled according to the comparison result.

[0034] Furthermore, the preset temperature is -25℃;

[0035] The preset exhaust temperature is 55℃;

[0036] The preset inlet water temperature is 25℃;

[0037] The first preset duration is 20 minutes.

[0038] According to another aspect of the present invention, a low-temperature heating system is provided, which includes the heat pump compressor unit described in any of the above embodiments.

[0039] The heat pump compressor unit provided in this embodiment of the invention includes a compressor, a four-way valve, a plate heat exchanger, a main valve, an evaporator, a heating gas-liquid separator, a solenoid valve, a plate heat exchanger connecting pipeline, a plate heat exchanger output pipeline, an ambient temperature sensor, and a control module. The plate heat exchanger connecting pipeline includes a main pipeline, a first branch pipeline, and a second branch pipeline. The first end of the compressor is connected to the first end of the four-way valve. The second end of the four-way valve is connected to the first end of the plate heat exchanger through the main pipeline and the first branch pipeline. The second end of the plate heat exchanger is connected to the first end of the main valve through the plate heat exchanger output pipeline. The second end of the main valve is connected to the first end of the evaporator. The second end of the main valve is connected to the first end of the evaporator. The second end of the evaporator is connected to the third end of the four-way valve. The fourth end of the four-way valve is connected to the first end of the heating gas-liquid separator. The second end of the heating gas-liquid separator is connected to the compressor. The second end of the machine is connected; the second end of the four-way valve is connected to the output pipeline of the plate heat exchanger through the main pipeline and the second branch pipeline, and the second branch pipeline passes through the heating gas-liquid separator. The solenoid valve is set on the second branch pipeline. The high-temperature gas after compression is transmitted to the plate heat exchanger through the four-way valve by the compressor. The high-temperature gas received by the plate heat exchanger exchanges heat with the coolant and is converted into a high-temperature liquid. It is then transmitted to the main valve. The main valve reduces the flow rate of the high-temperature liquid so that the high-temperature liquid is converted into a low-temperature liquid. The low-temperature liquid is then transmitted to the evaporator. The evaporator exchanges heat with the outside air and is converted into a low-temperature gas. It is then transmitted to the heating gas-liquid separator through the four-way valve so that the low-temperature gas exchanges heat with the high-temperature gas in the second branch pipeline. The heating gas-liquid separator returns the low-temperature gas that has undergone heat exchange to the compressor. Compared to existing technologies that directly feed the low-temperature gas flowing into the gas-liquid separator into the compressor, this invention controls the opening of a solenoid valve when the ambient temperature is low. This allows the low-temperature gas entering the heated gas-liquid separator to exchange heat with the high-temperature gas flowing through the second branch, enabling the liquid mixed in the low-temperature gas to be fully vaporized. The fully vaporized low-temperature gas is then transferred to the compressor, preventing liquid from entering the compressor, avoiding liquid slugging, preventing damage to the compressor during low-temperature operation, improving the service life of the heat pump compressor unit, and reducing maintenance costs.

[0040] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 This is a schematic diagram of the structure of a heat pump compressor unit according to an embodiment of the present invention;

[0043] Figure 2 This is a schematic diagram of another heat pump compressor unit provided according to an embodiment of the present invention. Detailed Implementation

[0044] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0045] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0046] This invention provides a heat pump compressor unit. Figure 1 This is a schematic diagram of a heat pump compressor unit according to an embodiment of the present invention, with reference to... Figure 1 The heat pump compressor unit includes:

[0047] Compressor 1, four-way valve 2, plate heat exchanger 3, main valve 4, evaporator 5, heating gas-liquid separator 6, solenoid valve 7, plate heat exchanger connecting pipe 81, plate heat exchanger output pipe 82, ambient temperature sensor and control module; plate heat exchanger connecting pipe 81 includes main pipe 811, first branch pipe 812 and second branch pipe 813.

[0048] The first end of compressor 1 is connected to the first end of four-way valve 2. The second end E of four-way valve 2 is connected to the first end of plate heat exchanger 3 through main pipeline 811 and first branch pipeline 812. Compressor 1 is used to transfer the compressed high-temperature gas to plate heat exchanger 3 through four-way valve 2.

[0049] The second end of the plate heat exchanger 3 is connected to the first end of the main valve 4 through the plate heat exchanger output pipe 82. The second end of the main valve 4 is connected to the first end of the evaporator 5. The plate heat exchanger 3 is used to exchange heat between the received high-temperature gas and the coolant, convert it into a high-temperature liquid, and transmit it to the main valve 4.

[0050] The second end of the main valve 4 is connected to the first end of the evaporator 5. The main valve 4 is used to reduce the flow rate of the high-temperature liquid so that the high-temperature liquid is converted into a low-temperature liquid and the low-temperature liquid is transferred to the evaporator 5.

[0051] The second end of the evaporator 5 is connected to the third end C of the four-way valve 2, the fourth end S of the four-way valve 2 is connected to the first end of the heating gas-liquid separator 6, and the second end of the heating gas-liquid separator 6 is connected to the second end of the compressor 1. The second end E of the four-way valve 2 is connected to the plate heat exchanger output pipe 82 through the main pipe 811 and the second branch pipe 813, and the second branch pipe 813 passes through the heating gas-liquid separator 6. The solenoid valve 7 is located in the second branch pipe 813, on the side close to the main pipe 811. The evaporator 5 is used to exchange heat between the low-temperature liquid and the outside air, converting it into low-temperature gas, and then transmits it to the heating gas-liquid separator 6 through the four-way valve 2 so that the low-temperature gas can exchange heat with the high-temperature gas in the second branch pipe 813. The heating gas-liquid separator 6 is used to return the low-temperature gas after heat exchange to the compressor 1.

[0052] An ambient temperature sensor is connected to a control module. The ambient temperature sensor is used to detect the external ambient temperature in real time and transmit the external ambient temperature to the control module. The control module is used to control the working state of the solenoid valve 7 according to the external ambient temperature.

[0053] Specifically, after the heat pump compressor unit is turned on, the ambient temperature sensor will also turn on and transmit the ambient temperature to the control module in real time. When the ambient temperature is higher than the first preset temperature, the control module controls the solenoid valve 7 to open so that the second branch 813 is in a conducting state. For example, the first preset temperature can be -25℃. If the ambient temperature is greater than -25℃, the control module controls the solenoid valve 7 to open. The compressor 1 will compress the internal low-temperature gas into high-temperature gas, which will then pass through the second end E of the four-way valve 2. One path is transmitted to the heat exchanger 3 through the main pipe 811 and the first branch 812 for heat exchange, thereby converting the high-temperature gas into high-temperature liquid and transmitting it to the main valve 4. The other path is transmitted through the main pipe 811 and the second branch 813 through the heating gas-liquid separator 6 and to the main valve 4. The main valve 4 then reduces the flow rate of the high-temperature liquid, causing it to be converted into a low-temperature liquid and transmitted to the evaporator 5. The evaporator 5 converts the low-temperature liquid into low-temperature gas, which is then transmitted to the heating gas-liquid separator 6 through the four-way valve 2. This allows the low-temperature gas entering the heating gas-liquid separator 6 to exchange heat with the high-temperature gas flowing through the second branch 813, causing the liquid mixed in the low-temperature gas to be fully vaporized. The fully vaporized low-temperature gas is then transmitted to the compressor 1 to prevent liquid from entering the compressor 1 and to avoid liquid slugging in the compressor 1. If the ambient temperature is less than or equal to -25℃, the control module closes the solenoid valve 7. The compressor 1 compresses the internal low-temperature gas into high-temperature gas, which then passes through the second end E of the four-way valve 2. This gas is then transmitted to the heat exchanger 3 via the main pipe 811 and the first branch pipe 812 for heat exchange, converting the high-temperature gas into a high-temperature liquid. This liquid is then transmitted to the main valve 4, where the main valve 4 reduces the flow rate of the high-temperature liquid, converting it into a low-temperature liquid. The liquid is then transmitted to the evaporator 5, where it is converted into a low-temperature gas. This gas is then transmitted through the four-way valve 2 to the heating gas-liquid separator 6, allowing the low-temperature gas entering the separator 6 to be directly transmitted to the compressor 1. Because the ambient temperature is not very low, the evaporator 5 effectively converts the low-temperature liquid into low-temperature gas, thus preventing liquid slugging in the compressor 1. The evaporator 5 uses a fan 51 within it to exchange heat between the ambient temperature and the low-temperature liquid in the pipes, converting the low-temperature liquid into low-temperature gas.

[0054] The heat pump compressor unit provided in this embodiment of the invention includes a compressor 1, a four-way valve 2, a plate heat exchanger 3, a main valve 4, an evaporator 5, a heating gas-liquid separator 6, a solenoid valve 7, a plate heat exchanger connecting pipe 81, a plate heat exchanger output pipe 82, an ambient temperature sensor, and a control module. The plate heat exchanger connecting pipe 81 includes a main pipe 811, a first branch pipe 812, and a second branch pipe 813. The first end of the compressor 1 is connected to the first end of the four-way valve 2. The second end E of the four-way valve 2 is connected to the first end of the plate heat exchanger 3 through the main pipe 811 and the first branch pipe 812. The second end of the plate heat exchanger 3 is connected to the first end of the main valve 4 through the plate heat exchanger output pipe 82. The second end of the main valve 4 is connected to the first end of the evaporator 5. The second end of the main valve 4 is connected to the first end of the evaporator 5. The second end of the evaporator 5 is connected to the third end C of the four-way valve 2. The fourth end S of the four-way valve 2 is connected to the first end of the heating gas-liquid separator 6. The heating gas-liquid separator 6... The second end of the four-way valve 2 is connected to the second end of the compressor 1; the second end E of the four-way valve 2 is connected to the output pipeline 82 of the plate heat exchanger through the main pipeline 811 and the second branch pipeline 813, and the second branch pipeline 813 passes through the heating gas-liquid separator 6. The solenoid valve 7 is set on the second branch pipeline 813. The high-temperature gas compressed by the compressor 1 is transmitted to the plate heat exchanger 3 through the four-way valve 2. The high-temperature gas received by the plate heat exchanger 3 exchanges heat with the coolant and is converted into a high-temperature liquid. It is then transmitted to the main valve 4. The main valve 4 reduces the flow rate of the high-temperature liquid so that the high-temperature liquid is converted into a low-temperature liquid. The low-temperature liquid is then transmitted to the evaporator 5. The evaporator 5 exchanges heat with the outside air and is converted into a low-temperature gas. It is then transmitted to the heating gas-liquid separator 6 through the four-way valve 3 so that the low-temperature gas exchanges heat with the high-temperature gas in the second branch pipeline 813. The heating gas-liquid separator 6 returns the low-temperature gas that has undergone heat exchange to the compressor 1. Compared to existing technologies where the low-temperature gas flowing into the gas-liquid separator is directly fed into the compressor, this embodiment of the invention controls the opening of the solenoid valve 7 when the ambient temperature is low. This allows the low-temperature gas entering the heated gas-liquid separator 6 to exchange heat with the high-temperature gas flowing through the second branch 813, enabling the liquid mixed in the low-temperature gas to be fully vaporized. The fully vaporized low-temperature gas is then transferred to the compressor 1, thus preventing liquid from entering the compressor 1, avoiding liquid slugging in the compressor 1, preventing damage to the compressor 1 during low-temperature operation, improving the service life of the heat pump compressor unit, and reducing maintenance costs.

[0055] Further reference Figure 1 The heat pump compressor unit also includes:

[0056] Water supply module 9, exhaust temperature sensor 101 and inlet water temperature sensor 102;

[0057] The exhaust temperature sensor 101 is connected to the control module. The exhaust temperature sensor 101 is set on the outlet side of the compressor 1. The exhaust temperature sensor 101 is used to detect the exhaust temperature of the compressor 1 in real time and transmit the exhaust temperature to the control module.

[0058] The first end of the water supply module 10 is connected to the third end of the plate heat exchanger 3, and the second end of the water supply module 10 is connected to the fourth end of the plate heat exchanger 3; the water supply module 10 is used to provide coolant to the plate heat exchanger 3.

[0059] The inlet water temperature sensor 102 is connected to the control module. The inlet water temperature sensor 102 is used to detect the first temperature of the coolant flowing into the plate heat exchanger 3 in real time and transmit the first temperature to the control module.

[0060] The control module is used to control the working state of solenoid valve 7 according to the exhaust temperature when the ambient temperature is higher than the preset temperature; and to control the working state of solenoid valve 7 according to the first temperature when the ambient temperature is lower than or equal to the preset temperature.

[0061] Specifically, when the ambient temperature is greater than or equal to the preset temperature and the exhaust temperature is less than the preset exhaust temperature, the control module controls the solenoid valve 7 to open for a first preset duration; when the ambient temperature is less than the preset temperature and the first temperature is less than the preset inlet water temperature, the control module controls the solenoid valve 7 to remain open.

[0062] Further reference Figure 1 The control module is used for:

[0063] When the ambient temperature is greater than or equal to the preset temperature and the exhaust temperature is less than the preset exhaust temperature, the control solenoid valve is opened for a first preset time.

[0064] When the ambient temperature is lower than the preset temperature and the first temperature is lower than the preset inlet water temperature, the solenoid valve is opened.

[0065] Specifically, if the ambient temperature is greater than or equal to the preset temperature, it indicates that the ambient temperature is not too low. However, if the exhaust temperature is lower than the preset exhaust temperature, it means that the high-temperature gas after compression by compressor 1 is at a low temperature. After heat exchange through water supply module 10, main valve 4, and evaporator 5, the low-temperature gas flowing into the heating gas-liquid separator 6 is prone to increasing the amount of liquid mixed in, thus affecting the normal operation of compressor 1. At this time, it is necessary to control solenoid valve 7 to open for a first preset time. The first preset time can be set according to the actual situation. For example, the first preset time can be 20 minutes. After solenoid valve 7 is opened, the low-temperature gas flowing into the heating gas-liquid separator 6 exchanges heat with the high-temperature gas flowing through the second branch 813, so that the liquid mixed in the low-temperature gas is fully vaporized. Then, the fully vaporized low-temperature gas is transferred to compressor 1, avoiding liquid slugging in compressor 1.

[0066] If the ambient temperature is lower than the preset temperature, it indicates that the ambient temperature is too low. If the first temperature is lower than the preset inlet water temperature, it indicates that the coolant temperature in the water supply module 10, which performs heat exchange, is low. After heat exchange through the water supply module 10, the main valve 4, and the evaporator 5, the liquid mixed in the low-temperature gas entering the heating gas-liquid separator 6 is likely to increase, which will affect the normal operation of the compressor 1. At this time, the solenoid valve 7 needs to be kept open so that the low-temperature gas flowing into the heating gas-liquid separator 6 can exchange heat with the high-temperature gas flowing through the second branch 813, so that the liquid mixed in the low-temperature gas can be fully vaporized, thereby avoiding liquid slugging in the compressor 1.

[0067] Furthermore, the control module is used for:

[0068] The operating status of the main valve is controlled based on the exhaust temperature and the first temperature.

[0069] Specifically, the temperature difference between the exhaust temperature and the first temperature is calculated to determine the temperature difference value, which is then compared with a preset temperature difference value. Based on the comparison result, the working state of the main valve is controlled.

[0070] Furthermore, the control module is used for:

[0071] The temperature difference is determined by taking the difference between the exhaust temperature and the first temperature.

[0072] The temperature difference is compared with the preset temperature difference, and the working state of the main valve is controlled according to the comparison result.

[0073] Specifically, if the temperature difference is greater than or equal to the preset temperature difference, it indicates that there is less low-temperature gas returning to the compressor. In this case, the main valve needs to be opened to a larger first degree to increase the return flow of low-temperature gas, thereby preventing the compressor from being damaged due to excessively high compressor output gas temperature. If the temperature difference is less than the preset temperature difference, the main valve needs to be opened to a smaller second degree to reduce the return flow of low-temperature gas, thereby preventing liquid slugging during the compressor output of high-temperature gas, which could damage the compressor.

[0074] Furthermore, Figure 2 This is a schematic diagram of another heat pump compressor unit provided according to an embodiment of the present invention, for reference. Figure 2 The heat pump compressor unit also includes:

[0075] The enthalpy-increasing plate heat exchanger 11, the enthalpy-increasing output pipeline 12, and the auxiliary valve 13 are included; the enthalpy-increasing output pipeline 12 includes the main enthalpy-increasing output pipeline 121, the first enthalpy-increasing branch pipeline 122, and the second enthalpy-increasing branch pipeline 123.

[0076] The second end of the plate heat exchanger 3 is connected to the first end of the enthalpy-increasing plate heat exchanger 11 through the plate heat exchanger output pipeline 82. The second end of the enthalpy-increasing plate heat exchanger 11 is connected to the first end of the main valve 4 through the enthalpy-increasing output main pipeline 121 and the first enthalpy-increasing branch pipeline 122. The second end of the enthalpy-increasing plate heat exchanger 11 is connected to the first end of the auxiliary valve 13 through the enthalpy-increasing output main pipeline 121 and the second enthalpy-increasing branch pipeline 123. The second end of the auxiliary valve 13 is connected to the third end of the enthalpy-increasing plate heat exchanger 11. The fourth end of the enthalpy-increasing plate heat exchanger 11 is connected to the third end of the compressor 1.

[0077] The enthalpy-increasing plate heat exchanger 11 is used to reduce the flow rate of the high-temperature liquid flowing into the second enthalpy-increasing branch 123, so that the high-temperature liquid is converted into a low-temperature liquid, and the low-temperature liquid is transferred to the enthalpy-increasing plate heat exchanger 11; the enthalpy-increasing plate heat exchanger 11 is used to exchange heat between the low-temperature liquid flowing in from the third end and the high-temperature liquid flowing in from the first end, converting it into a low-temperature gas, and flowing into the compressor 1.

[0078] Specifically, when it is necessary to improve the working efficiency of the heat pump compressor unit, the auxiliary valve 13 can be opened by the control module. This allows the high-temperature liquid flowing out of the heat exchanger 3 to flow into the compressor 1 through the enthalpy-increasing heat exchanger 11, the main valve 4, the evaporator 5, the four-way valve 2, and the heating gas-liquid separator 6. The other flow flows into the auxiliary valve 13 through the enthalpy-increasing heat exchanger 11. The auxiliary valve 13 reduces the flow rate of the high-temperature liquid, causing it to transform into a low-temperature liquid. The low-temperature liquid flowing out of the auxiliary valve 13 then flows into the enthalpy-increasing heat exchanger 11 for heat exchange, transforming the low-temperature liquid into a low-temperature gas that is then delivered to the compressor 1. This improves the return efficiency of the low-temperature gas, thereby enhancing the working efficiency of the heat pump compressor unit.

[0079] Furthermore, the control module is used for:

[0080] The operating status of the auxiliary valve is controlled based on the exhaust temperature and the first temperature.

[0081] Specifically, the temperature difference between the exhaust temperature and the first temperature is calculated to determine the temperature difference value. Then, the temperature difference value is compared with the preset temperature difference value, and the working state of the auxiliary valve is controlled according to the comparison result.

[0082] Furthermore, the control module is used for:

[0083] The temperature difference is determined by taking the difference between the exhaust temperature and the first temperature.

[0084] The temperature difference is compared with the preset temperature difference, and the working state of the auxiliary valve is controlled according to the comparison result.

[0085] Specifically, if the temperature difference is greater than or equal to the preset temperature difference, it indicates that there is less low-temperature gas returning to the compressor from the main valve and auxiliary valve. In this case, the auxiliary valve can be opened to a larger first degree to increase the return flow of low-temperature gas, thereby preventing compressor damage caused by excessively high compressor output gas temperature. For example, if the temperature difference is very large, the opening degree of both the main valve and auxiliary valve can be increased simultaneously to increase the return flow of low-temperature gas. If the temperature difference is less than the preset temperature difference, the auxiliary valve needs to be opened to a smaller second degree to reduce the return flow of low-temperature gas, thereby preventing liquid slugging during compressor output of high-temperature gas, which could damage the compressor. For example, if the temperature difference is very small, the opening degree of both the main valve and auxiliary valve can be reduced simultaneously to reduce the return flow of low-temperature gas.

[0086] Furthermore, the preset temperature is -25℃;

[0087] The preset exhaust temperature is 55℃;

[0088] The preset inlet water temperature is 25℃;

[0089] The first preset duration is 20 minutes.

[0090] This invention provides a low-temperature heating system, which includes any of the heat pump compressor units described in the above embodiments. Since the low-temperature heating system provided by this invention includes any of the heat pump compressor units described in the above technical solutions, it possesses the beneficial effects of the aforementioned heat pump compressor units, which will not be elaborated further here.

[0091] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0092] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A heat pump compressor unit, characterized in that, include: The system includes a compressor, a four-way valve, a plate heat exchanger, a main valve, an evaporator, a heating gas-liquid separator, a solenoid valve, plate heat exchanger connecting pipes, plate heat exchanger output pipes, an ambient temperature sensor, and a control module; the plate heat exchanger connecting pipes include a main pipe, a first branch pipe, and a second branch pipe. The first end of the compressor is connected to the first end of the four-way valve, and the second end of the four-way valve is connected to the first end of the heat exchanger through the main pipeline and the first branch pipeline. The compressor is used to transmit the compressed high-temperature gas to the heat exchanger through the four-way valve. The second end of the plate heat exchanger is connected to the first end of the main valve through the plate heat exchanger output pipeline, and the second end of the main valve is connected to the first end of the evaporator. The plate heat exchanger is used to exchange heat between the received high-temperature gas and the coolant, convert it into a high-temperature liquid, and transmit it to the main valve. The second end of the main valve is connected to the first end of the evaporator. The main valve is used to reduce the flow rate of the high-temperature liquid so that the high-temperature liquid is converted into a low-temperature liquid and the low-temperature liquid is transferred to the evaporator. The second end of the evaporator is connected to the third end of the four-way valve, the fourth end of the four-way valve is connected to the first end of the heated gas-liquid separator, and the second end of the heated gas-liquid separator is connected to the second end of the compressor. The second end of the four-way valve is connected to the plate heat exchanger output pipeline through the main pipeline and the second branch pipeline, and the second branch pipeline passes through the heated gas-liquid separator. The solenoid valve is located on the second branch pipeline, near the main pipeline. The evaporator is used to exchange heat between the low-temperature liquid and the outside air, converting it into low-temperature gas, and then transmits it to the heated gas-liquid separator through the four-way valve, so that the low-temperature gas can exchange heat with the high-temperature gas in the second branch pipeline. The heated gas-liquid separator is used to return the low-temperature gas after heat exchange to the compressor. The ambient temperature sensor is connected to the control module. The ambient temperature sensor is used to detect the external ambient temperature in real time and transmit the external ambient temperature to the control module. The control module is used to control the working state of the solenoid valve according to the external ambient temperature. Also includes: Water supply module, exhaust temperature sensor and inlet water temperature sensor; The exhaust temperature sensor is connected to the control module. The exhaust temperature sensor is located on the outlet side of the compressor. The exhaust temperature sensor is used to detect the exhaust temperature of the compressor in real time and transmit the exhaust temperature to the control module. The first end of the water supply module is connected to the third end of the heat exchanger, and the second end of the water supply module is connected to the fourth end of the heat exchanger; the water supply module is used to provide coolant to the heat exchanger. The inlet water temperature sensor is connected to the control module. The inlet water temperature sensor is used to detect the first temperature of the coolant flowing into the heat exchanger in real time and transmit the first temperature to the control module. The control module is used to control the working state of the solenoid valve according to the exhaust temperature when the ambient temperature is greater than the preset temperature; and to control the working state of the solenoid valve according to the first temperature when the ambient temperature is less than or equal to the preset temperature. The control module is used for: When the ambient temperature is greater than or equal to a preset temperature and the exhaust temperature is less than the preset exhaust temperature, the solenoid valve is controlled to open for a first preset duration. When the ambient temperature is lower than a preset temperature and the first temperature is lower than a preset inlet water temperature, the solenoid valve is controlled to open.

2. The heat pump compressor unit according to claim 1, characterized in that, The control module is used for: The operating state of the main valve is controlled based on the exhaust temperature and the first temperature.

3. The heat pump compressor unit according to claim 2, characterized in that, The control module is used for: The temperature difference is determined by taking the difference between the exhaust temperature and the first temperature. The temperature difference is compared with a preset temperature difference, and the working state of the main valve is controlled according to the comparison result.

4. The heat pump compressor unit according to claim 1, characterized in that, Also includes: Enthalpy-increasing plate heat exchanger, enthalpy-increasing output pipeline and auxiliary valve; the enthalpy-increasing output pipeline includes an enthalpy-increasing main pipeline, a first enthalpy-increasing branch pipeline and a second enthalpy-increasing branch pipeline; The second end of the plate heat exchanger is connected to the first end of the enthalpy-increasing plate heat exchanger through the plate heat exchanger output pipeline. The second end of the enthalpy-increasing plate heat exchanger is connected to the first end of the main valve through the enthalpy-increasing output main pipeline and the first enthalpy-increasing branch pipeline. The second end of the enthalpy-increasing plate heat exchanger is connected to the first end of the auxiliary valve through the enthalpy-increasing output main pipeline and the second enthalpy-increasing branch pipeline. The second end of the auxiliary valve is connected to the third end of the enthalpy-increasing plate heat exchanger. The fourth end of the enthalpy-increasing plate heat exchanger is connected to the third end of the compressor. The enthalpy-increasing plate heat exchanger is used to reduce the flow rate of the high-temperature liquid flowing into the second enthalpy-increasing branch, so that the high-temperature liquid is converted into a low-temperature liquid, and the low-temperature liquid is transferred to the enthalpy-increasing plate heat exchanger; the enthalpy-increasing plate heat exchanger is used to exchange heat between the low-temperature liquid flowing in from the third end and the high-temperature liquid flowing in from the first end, converting it into a low-temperature gas, which then flows into the compressor.

5. The heat pump compressor unit according to claim 4, characterized in that, The control module is used for: The operating state of the auxiliary valve is controlled based on the exhaust temperature and the first temperature.

6. The heat pump compressor unit according to claim 5, characterized in that, The control module is used for: The temperature difference is determined by taking the difference between the exhaust temperature and the first temperature. The temperature difference is compared with a preset temperature difference, and the working state of the auxiliary valve is controlled according to the comparison result.

7. The heat pump compressor unit according to claim 1, characterized in that, The preset temperature is -25℃; The preset exhaust temperature is 55°C; The preset inlet water temperature is 25℃; The first preset duration is 20 minutes.

8. A low-temperature heating system, characterized in that, Includes the heat pump compressor unit as described in any one of claims 1-7.

Images