A low-temperature heat pump air conditioning system suitable for high-rise building installation

Abstract

A low-temperature heat pump air conditioning system suitable for high-rise building installation, comprising an outdoor unit, an indoor unit, a distribution water collector and a heating terminal, the outdoor unit comprising an outdoor shell, an outdoor heat exchanger and a fan, the indoor unit comprising an enthalpy-increasing compressor, a four-way valve, a water-side heat exchanger, an economizer, a gas-liquid separator, a main electronic expansion valve, a secondary electronic expansion valve, a coupling water tank, a first one-way valve, a second one-way valve, a third one-way valve and a fourth one-way valve; the distribution water collector comprises a water distributor and a water collector; the two ends of the outdoor heat exchanger are communicated with the indoor unit, the water circuit of the water-side heat exchanger is communicated with the water distributor and the water collector respectively, and the distribution water collector is communicated with the heating terminal. The outdoor unit is light in weight and convenient to install on high floors; the use of the enthalpy-increasing compressor is suitable for use in low-temperature or ultra-low-temperature environments.

Description

Technical Field

[0001] This utility model relates to an air source heat pump system. Background Technology

[0002] The existing technology, Chinese patent 201520578605.9, describes a heat pump unit including an indoor unit and an outdoor unit. The indoor unit includes an indoor unit housing and indoor air conditioning system components located within the housing. The outdoor unit includes an outdoor unit housing and outdoor air conditioning system components located within the housing. The indoor and outdoor air conditioning system components are connected via refrigerant piping to form a refrigerant circuit for the heat pump unit. The indoor air conditioning system components include a compressor and a water-side heat exchanger that condenses the refrigerant during heating. The outdoor air conditioning system components include an air-cooled heat exchanger that evaporates the refrigerant during heating. The problems with this technology are: it uses two throttling devices, resulting in a complex structure; and it cannot be used in low or ultra-low temperature environments. Utility Model Content

[0003] The purpose of this utility model is to provide a low-temperature heat pump air conditioning system suitable for installation in high-rise buildings. It features a lightweight outdoor unit and is suitable for use in low-temperature or ultra-low-temperature environments.

[0004] This utility model is implemented as follows: a low-temperature heat pump air conditioning system suitable for installation in high-rise buildings, characterized in that it includes an outdoor unit, an indoor unit, a manifold, and heating terminals.

[0005] The outdoor unit includes the outer casing, outdoor heat exchanger, and fan.

[0006] The indoor unit includes an enthalpy-increasing compressor, a four-way valve, a water-side heat exchanger, an economizer, a gas-liquid separator, a main electronic expansion valve, a secondary electronic expansion valve, a coupling water tank, a first check valve, a second check valve, a third check valve, and a fourth check valve.

[0007] A water distribution manifold includes a water distributor and a water collector;

[0008] The outdoor heat exchanger is connected to the indoor unit at both ends, and the water circuit of the water-side heat exchanger is connected to the water distributor and the water collector respectively. The water distributor and the water collector are connected to the heating terminal.

[0009] The low-temperature heat pump air conditioning system suitable for high-rise building installation is characterized in that: the outdoor unit includes an outdoor first refrigerant pipe and an outdoor second refrigerant pipe, which are respectively connected to an outdoor heat exchanger;

[0010] The indoor unit also includes an inner first refrigerant line, an inner second refrigerant line, and a water pump;

[0011] The first refrigerant line is connected to the E end of the four-way valve; the exhaust port of the enthalpy-increasing compressor is connected to the D end of the four-way valve; the S end of the four-way valve, the gas-liquid separator, and the return port of the enthalpy-increasing compressor are connected in sequence; the C end of the four-way valve, the refrigerant line of the water-side heat exchanger, and one end of the main line of the economizer are connected; one end of the auxiliary line of the economizer is connected to the enthalpy-increasing gas port of the enthalpy-increasing compressor; one end of the water line of the water-side heat exchanger is equipped with a water supply pipe, and the other end is equipped with a water return pipe, as well as a water pump and a coupling water tank;

[0012] The first and second check valves are located on the first pipeline and their outflow directions are opposite to form the first control pipeline. The third and fourth check valves are located on the second pipeline and their inflow directions are opposite to form the second control pipeline. The first and second control pipelines are connected in parallel, with one end connected to the inner second refrigerant pipeline and the other end connected to the main pipeline of the economizer. The first pipeline between the main electronic expansion valve and the first and second check valves, and the second pipeline between the third and fourth check valves are connected. The auxiliary electronic expansion valve is connected to the auxiliary pipeline and the main pipeline of the economizer. The outer first refrigerant pipeline and the outer second refrigerant pipeline are respectively connected to the inner first refrigerant pipeline and the inner second refrigerant pipeline.

[0013] The low-temperature heat pump air conditioning system suitable for high-rise building installation is characterized by the following: it also includes a drive radiator, which is located on the pipeline where the main electronic expansion valve is located and connected in series.

[0014] The low-temperature heat pump air conditioning system suitable for high-rise building installation is characterized by the following: it also includes a balance tank, and the balance tank is connected to the pipeline between the water-side heat exchanger and the economizer.

[0015] The low-temperature heat pump air conditioning system suitable for installation in high-rise buildings is characterized by the fact that the coupling water tank is also equipped with an expansion tank.

[0016] The low-temperature heat pump air conditioning system suitable for installation in high-rise buildings is characterized by the fact that the coupling water tank is also equipped with a drain valve.

[0017] The low-temperature heat pump air conditioning system suitable for high-rise building installation is characterized in that: the heating terminal includes underfloor heating pipes and / or radiators, and the underfloor heating pipes and radiators are respectively connected to a manifold and a collector.

[0018] The low-temperature heat pump air conditioning system suitable for high-rise buildings is characterized by the fact that it also includes a dehumidifier and temperature controller, which is connected to a water distributor and a water collector.

[0019] This utility model discloses a low-temperature heat pump air conditioning system suitable for installation in high-rise buildings. Due to this structure, the outdoor unit is lightweight and easy to install in high-rise buildings; the use of an enthalpy-increasing compressor makes it suitable for use in low-temperature or ultra-low-temperature environments. Attached Figure Description

[0020] Figure 1 This is the front view of this utility model.

[0021] Figure 2 This is the front view of the outdoor unit of this utility model.

[0022] Figure 3 This is the front view of the indoor unit of this utility model.

[0023] Figure 4 This is a front view of the heating terminal of this utility model. Detailed Implementation

[0024] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0025] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] like Figure 1 As shown, a low-temperature heat pump air conditioning system suitable for installation in high-rise buildings includes an outdoor unit 1, an indoor unit 2, a manifold 3, and heating terminals 4.

[0027] Outdoor unit 1 includes an outer casing (not shown in the figure), an outdoor heat exchanger 11, and a fan 12.

[0028] The indoor unit 2 includes an enthalpy-increasing compressor 20, a four-way valve 21, a water-side heat exchanger 22, an economizer 23, a gas-liquid separator 24, a main electronic expansion valve 251, a secondary electronic expansion valve 252, a coupling water tank 26, a first check valve 271, a second check valve 272, a third check valve 273, and a fourth check valve 274.

[0029] The coupling water tank 26 has the following functions: (i) Avoiding frequent start-stop of the main unit. When the terminal (such as underfloor heating pipes, fan coil units) is briefly shut down or the demand is very low, the circulating water volume of the main unit will decrease sharply, causing the main unit to quickly reach the set temperature and shut down. However, frequent start-stop of the compressor will greatly shorten its lifespan and increase energy consumption. The coupling water tank increases the system water capacity. When the terminal is shut down, the main unit can continue to exchange heat with the water in the coupling water tank, storing the heat in the water, thereby extending the operating time of the main unit and avoiding short-cycle cycles. The energy required to start the main unit once is much greater than the energy consumption for continuous operation for a period of time. (ii) Ensuring efficient and stable operation of the system. The main unit (especially the air source heat pump) has an optimal operating flow range. Too low a flow rate will lead to a decrease in heat exchange efficiency and may even cause problems such as low pressure alarms and freezing. The coupling water tank provides a stable hydraulic environment. The system's circulating pump can prioritize ensuring that the water flow rate on the main unit side is stable within the optimal range, while the changes in demand on the user side are "buffered" by the coupling water tank, ensuring that the main unit always operates under efficient conditions. (III) Effective defrosting enhances heating comfort. Air source heat pumps require regular defrosting during winter heating. During defrosting, the main unit absorbs heat from the indoor side. If the system's water capacity is small, the water temperature will drop rapidly, resulting in cold air blowing into the room and poor comfort. Systems with coupling water tanks store a large amount of hot water. During the few minutes of defrosting, this hot water can continue to supply heat to the room, avoiding drastic fluctuations in indoor temperature and greatly improving comfort.

[0030] The water distribution manifold 3 includes a water distributor 31 and a water collector 32;

[0031] The outdoor heat exchanger 11 is connected to the indoor unit 2 at both ends. The water circuit of the water-side heat exchanger 22 is connected to the water distributor 31 and the water collector 32 respectively. The water distributor 3 is connected to the heating terminal 4. With this design, the outdoor unit is lightweight and easy to install. The indoor unit 2, where the enthalpy-increasing compressor 20 and the water-side heat exchanger 22 are located, is installed indoors, which is convenient for maintenance and can also prevent the water-side heat exchanger from freezing.

[0032] The outdoor unit 1 includes an external first refrigerant pipe 131 and an external second refrigerant pipe 132, which are respectively connected to the outdoor heat exchanger 11.

[0033] Indoor unit 2 also includes an inner first refrigerant pipe 281, an inner second refrigerant pipe 282, and a water pump 261;

[0034] The first refrigerant line 281 is connected to the E end of the four-way valve 21, the exhaust port of the enthalpy-increasing compressor 20 is connected to the D end of the four-way valve 21, the S end of the four-way valve 21, the gas-liquid separator 24 and the return port of the enthalpy-increasing compressor 20 are connected in sequence; the C end of the four-way valve 21, the refrigerant line of the water-side heat exchanger 22 and one end of the main line of the economizer 23 are connected; one end of the auxiliary line of the economizer 23 is connected to the enthalpy-increasing gas port of the enthalpy-increasing compressor 20; one end of the water line of the water-side heat exchanger 22 is provided with a water supply pipe and the other end is provided with a water return pipe, and a water pump 261 and a coupling water tank 26 are provided on the water return pipe;

[0035] The first check valve 271 and the second check valve 272 are located on the first pipeline and their outflow directions are opposite to form the first control pipeline. The third check valve 273 and the fourth check valve 274 are located on the second pipeline and their inflow directions are opposite to form the second control pipeline. The first control pipeline and the second control pipeline are connected in parallel, with one end connected to the inner second refrigerant pipeline 282 and the other end connected to the main pipeline of the economizer 23. The first pipeline between the main electronic expansion valve 251 and the first check valve 271 and the second check valve 272, and the second pipeline between the third check valve 273 and the fourth check valve 274 are connected. The auxiliary electronic expansion valve 252 is connected to the auxiliary pipeline and the main pipeline of the economizer 23. The outer first refrigerant pipeline 131 and the outer second refrigerant pipeline 132 are connected to the inner first refrigerant pipeline 281 and the inner second refrigerant pipeline 282, respectively.

[0036] As a further improvement of this utility model, it also includes a drive radiator 29, which is installed in series on the pipeline where the main electronic expansion valve 251 is located. The main control board of the heat pump system is installed on the drive radiator 29, and the main control board is cooled by refrigerant.

[0037] As a further improvement of this utility model, it also includes a balance tank 2A, which is connected to the water-side heat exchanger 22 and the economizer 23 by a pipeline.

[0038] As a further improvement of this utility model, the coupling water tank 26 is also provided with an expansion tank 262.

[0039] The coupling water tank 26 is also equipped with a drain valve 263.

[0040] like Figure 4 As shown, the heating terminal 4 includes a floor heating pipe 41 and / or a radiator 42, which are connected to a manifold 31 and a collector 32, respectively.

[0041] As a further improvement of this utility model, it also includes a dehumidifier and temperature controller 43, which is connected to the water distributor 31 and the water collector 32. The dehumidifier and temperature controller 43 has been disclosed in Chinese Patent 202110943456.1, entitled "A Heat Pump Air Conditioner with Dehumidification Function".

[0042] The dehumidifier and temperature controller 43 can be installed on the floor or at the bottom of the wall, seamlessly integrating with the space. The system design is perfectly compatible with floor cooling systems, effectively supplementing indoor cooling capacity.

[0043] Heating mode:

[0044] (a) The exhaust port of the enthalpy-increasing compressor 20, the DC end of the four-way valve, the refrigerant pipeline of the water-side heat exchanger 22, and the main pipeline of the economizer 23 are connected in sequence; (1) The refrigerant enters the enthalpy-increasing compressor 20 through the main pipeline of the economizer 23, the first one-way valve 271, the drive radiator 29, the main electronic expansion valve 251, the third one-way valve 273, the inner second refrigerant pipeline 282, the outer second refrigerant pipeline 132, the outdoor heat exchanger 13, the ES end of the four-way valve, and the gas-liquid separator 15 via the return gas pipe of the enthalpy-increasing compressor 20; (2) The refrigerant is connected to the enthalpy-increasing port of the enthalpy-increasing compressor 20 through the main pipeline of the economizer 23, the auxiliary electronic expansion valve 252, and the auxiliary pipeline of the economizer 23; Figure 3 The direction of the hollow arrow in the middle;

[0045] (ii) At the same time, the water supply pipe, water distributor 31, heating terminal 4, water collector 32, coupling water tank 26, and water pump 261 of the water-side heat exchanger 22 enter the return water pipe of the water-side heat exchanger.

[0046] Cooling mode:

[0047] (a) The exhaust port of the enthalpy-increasing compressor 20, the CE terminal of the four-way valve 21, the inner first refrigerant line 281, the outer first refrigerant line 131, the outdoor heat exchanger 13, the outer second refrigerant line 132, the inner second refrigerant line 282, the second check valve 272, the drive radiator 29, the main electronic expansion valve 251, the fourth check valve 274, the main pipeline of the economizer 23, the refrigerant line 22 of the water-side heat exchanger, the CS terminal of the four-way valve 21, and the gas-liquid separator 24 are connected to the return port of the enthalpy-increasing compressor 20;

[0048] (ii) At the same time, the water supply outlet of the water-side heat exchanger 22, the water distributor 31, the heating terminal 4, the water collector 32, the coupling water tank 22, and the water pump 23 enter the water return end of the water path of the water-side heat exchanger 22.

[0049] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A low-temperature heat pump air conditioning system suitable for installation in high-rise buildings, characterized in that: Includes outdoor unit, indoor unit, manifold, and heating terminals. The outdoor unit includes the outer casing, outdoor heat exchanger, and fan. The indoor unit includes an enthalpy-increasing compressor, a four-way valve, a water-side heat exchanger, an economizer, a gas-liquid separator, a main electronic expansion valve, a secondary electronic expansion valve, a coupling water tank, a first check valve, a second check valve, a third check valve, and a fourth check valve. A water distribution manifold includes a water distributor and a water collector; The outdoor heat exchanger is connected to the indoor unit at both ends, and the water circuit of the water-side heat exchanger is connected to the water distributor and the water collector respectively. The water distributor and the water collector are connected to the heating terminal.

2. A low-temperature heat pump air conditioning system suitable for high-rise building installation according to claim 1, characterized in that: The outdoor unit includes a first refrigerant pipe and a second refrigerant pipe, which are respectively connected to an outdoor heat exchanger; The indoor unit also includes an inner first refrigerant line, an inner second refrigerant line, and a water pump; The first refrigerant line is connected to the E end of the four-way valve; the exhaust port of the enthalpy-increasing compressor is connected to the D end of the four-way valve; the S end of the four-way valve, the gas-liquid separator, and the return port of the enthalpy-increasing compressor are connected in sequence; the C end of the four-way valve, the refrigerant line of the water-side heat exchanger, and one end of the main line of the economizer are connected; one end of the auxiliary line of the economizer is connected to the enthalpy-increasing gas port of the enthalpy-increasing compressor; one end of the water line of the water-side heat exchanger is equipped with a water supply pipe, and the other end is equipped with a water return pipe, as well as a water pump and a coupling water tank; The first and second check valves are located on the first pipeline and their outflow directions are opposite to form the first control pipeline. The third and fourth check valves are located on the second pipeline and their inflow directions are opposite to form the second control pipeline. The first and second control pipelines are connected in parallel, with one end connected to the inner second refrigerant pipeline and the other end connected to the main pipeline of the economizer. The first pipeline between the main electronic expansion valve and the first and second check valves, and the second pipeline between the third and fourth check valves are connected. The auxiliary electronic expansion valve is connected to the auxiliary pipeline and the main pipeline of the economizer. The outer first refrigerant pipeline and the outer second refrigerant pipeline are respectively connected to the inner first refrigerant pipeline and the inner second refrigerant pipeline.

3. A low-temperature heat pump air conditioning system suitable for installation in high-rise buildings according to claim 2, characterized in that: It also includes a drive radiator, which is located on the pipeline where the main electronic expansion valve is located and connected in series.

4. A low-temperature heat pump air conditioning system suitable for high-rise building installation according to claim 2, characterized in that: It also includes a balance tank, and the pipeline connecting the balance tank to the water-side heat exchanger and the economizer.

5. A low-temperature heat pump air conditioning system suitable for installation in high-rise buildings according to claim 2, characterized in that: The coupling water tank is also equipped with an expansion tank.

6. A low-temperature heat pump air conditioning system suitable for high-rise building installation according to claim 2, characterized in that: The coupling water tank is also equipped with a drain valve.

7. A low-temperature heat pump air conditioning system suitable for installation in high-rise buildings according to claim 1, 2, 3, 4, 5 or 6, characterized in that: The heating terminal includes underfloor heating pipes and / or radiators, which are connected to a manifold and a collector, respectively.

8. A low-temperature heat pump air conditioning system suitable for installation in high-rise buildings according to claim 7, characterized in that: It also includes a dehumidifier and temperature controller, which is connected to a water distributor and a water collector.

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