Refrigerating and heating heat pump system

Abstract

A refrigerating and heating heat pump system comprises an outdoor unit, an indoor unit, a first refrigerant pipeline and a second refrigerant pipeline, the outdoor unit comprises an enthalpy increasing compressor, a four-way valve, an outdoor heat exchanger, a liquid storage tank, an economizer, a gas-liquid separator, an outdoor throttling conversion assembly and an auxiliary road electronic expansion valve, and the indoor unit comprises a water side heat exchanger and an indoor throttling conversion assembly; one end of the outdoor throttling conversion assembly communicates with the outdoor heat exchanger, the other end of the outdoor throttling conversion assembly communicates with the economizer and the liquid storage tank and communicates with the enthalpy increasing air port through the auxiliary electronic expansion valve and the economizer, and the indoor throttling conversion assembly communicates with one end of a refrigerant pipeline of the water side heat exchanger. The C end of the four-way valve and the first refrigerant pipeline are communicated with the other end of the refrigerant pipeline of the water side heat exchanger; one end of the second refrigerant pipeline communicates with the indoor throttling conversion heat assembly, and the other end of the second refrigerant pipeline communicates with the liquid storage tank; during refrigeration, the indoor electronic expansion valve works; during heating, the outdoor main path electronic expansion valve works. And poor deposition of the low-pressure non-evaporated refrigerant in a relatively overlong refrigerant pipeline of the indoor unit and the outdoor unit is avoided. And the energy efficiency is improved.

Description

Technical Field

[0001] The invention relates to an air source heat pump system. Background Art

[0002] The current existing technology, Chinese Patent 202121742865.7, is a split-type air-source heat pump, which includes an indoor unit and an outdoor unit connected in a loop. The outdoor unit includes a compressor, a four-way valve, a gas-liquid separator, and an evaporator. The indoor unit includes a heat exchanger. The exhaust port of the compressor is connected to the D-end interface of the four-way valve. The C-end interface, S-end interface, and E-end interface of the four-way valve are respectively connected to the heat exchanger, gas-liquid separator, and evaporator. The exhaust port of the gas-liquid separator is connected to the return air port of the compressor, and the heat exchanger is connected to the evaporator. The problem is that during refrigeration operation, after the main valve throttles, the refrigerant needs to pass through the fluorine-circuit connecting pipe between the internal and external units before it can reach the evaporator of the internal unit for evaporation. At this time, due to the excessive length of the fluorine-circuit connecting pipe between the internal and external units and the evaporation characteristics of the refrigerant, the pressure of the internal unit evaporator is too low, and its capacity cannot be fully utilized, resulting in too low refrigeration capacity. Summary of the Invention

[0003] The object of the present invention is to provide a refrigeration and heating heat pump system, which has the characteristic of preventing refrigerant deposition in the refrigerant pipe connecting the indoor unit and the outdoor unit.

[0004] The present invention is implemented as follows: a refrigeration and heating heat pump system, which is special in that it includes an outdoor unit, an indoor unit, a first refrigerant pipeline and a second refrigerant pipeline,

[0005] The outdoor unit includes a heat-increasing compressor, a four-way valve, an outdoor heat exchanger, a liquid storage tank, an economizer, a gas-liquid separator, and an outdoor throttling conversion assembly. The four-way valve includes a C end, a D end, an E end, and an S end. The outdoor throttling conversion assembly includes an outdoor main electronic expansion valve, a first check valve, and a second check valve. The outdoor main electronic expansion valve and the first check valve constitute an outdoor throttling one-way branch and are connected in parallel with the second check valve.

[0006] The indoor unit includes a water-side heat exchanger and an indoor throttling conversion assembly, the indoor throttling conversion assembly includes an indoor electronic expansion valve, a third one-way valve and a fourth one-way valve, the indoor electronic expansion valve and the third one-way valve constitute an indoor throttling one-way branch and are connected in parallel with the fourth one-way valve;

[0007] One end of the outdoor throttling conversion component is connected to the outdoor heat exchanger, and the other end is connected to the economizer and the liquid storage tank, and is connected to the enthalpy increasing air port of the enthalpy increasing compressor through the auxiliary electronic expansion valve and the economizer. The indoor throttling heat conversion component is connected to one end of the refrigerant pipeline of the water side heat exchanger; the C end of the four-way valve, the first refrigerant pipeline and the other end of the refrigerant pipeline of the water side heat exchanger are connected; one end of the second refrigerant pipeline is connected to the indoor throttling heat conversion component, and the other end is connected to the liquid storage tank; during cooling, the indoor electronic expansion valve works; during heating, the outdoor main electronic expansion valve works.

[0008] The refrigeration and heating heat pump system is special in that: a first stop valve and a second stop valve are respectively provided at both ends of the first refrigerant pipeline;

[0009] A third stop valve and a fourth stop valve are respectively provided at both ends of the second refrigerant pipeline.

[0010] The cooling and heating heat pump system is special in that: during cooling, the exhaust port of the enthalpy increasing compressor, the DE end of the four-way valve, the outdoor heat exchanger, the second one-way valve, the economizer, the liquid storage tank, the second refrigerant pipeline, the third one-way valve, the indoor electronic expansion valve, the water-side heat exchanger, the first refrigerant pipeline, the CS end of the four-way valve, the gas-liquid separator and the return air port of the enthalpy increasing compressor are connected in sequence;

[0011] During heating, the exhaust port of the enthalpy increasing compressor, the DC end of the four-way valve, the first refrigerant pipeline, the water side heat exchanger, the fourth one-way valve, the second refrigerant pipeline, the economizer, the outdoor main electronic expansion valve, the first one-way valve, the outdoor heat exchanger, the ES end of the four-way valve, the gas-liquid separator and the return air port of the enthalpy increasing compressor are connected in sequence.

[0012] The present invention discloses a refrigeration and heating heat pump system. Due to the structure, (1) it prevents undesirable refrigerant deposition caused by low-pressure, unevaporated refrigerant in the relatively long refrigerant piping between the indoor and outdoor units. (2) It also prevents the refrigerant from flowing through the fluorine circuit connecting pipe between the indoor and outdoor units at a low pressure before evaporating in the outdoor unit, thereby improving energy efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a view of the cooling state of the present invention.

[0014] Figure 2 2 is a view of the heating state of the present invention. DETAILED DESCRIPTION

[0015] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0016] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediary, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0017] like Figure 1 As shown, a cooling and heating heat pump system includes an outdoor unit, an indoor unit, a first refrigerant pipeline 1A and a second refrigerant pipeline 1B.

[0018] The outdoor unit includes a heat-increasing compressor 2, a four-way valve 3, an outdoor heat exchanger 4, a liquid storage tank 5, an economizer 6, a gas-liquid separator 7, an outdoor throttling conversion component 8 and an auxiliary electronic expansion valve 9.

[0019] The four-way valve 3 includes C end, D end, E end and S end.

[0020] The outdoor throttling conversion assembly 8 includes an outdoor main electronic expansion valve 81, a first one-way valve 82 and a second one-way valve 83. The outdoor main electronic expansion valve 81 and the first one-way valve 82 constitute an outdoor throttling one-way branch and are connected in parallel with the second one-way valve 83.

[0021] The indoor unit includes a water-side heat exchanger 10 and an indoor throttling conversion assembly. The indoor throttling conversion assembly includes an indoor electronic expansion valve 111, a third one-way valve 112, and a fourth one-way valve 113. The indoor electronic expansion valve 111 and the third one-way valve 112 constitute an indoor throttling one-way branch and are connected in parallel with the fourth one-way valve 113.

[0022] One end of the outdoor throttling conversion component 8 is connected to the outdoor heat exchanger 4, and the other end is connected to the economizer 6 and the liquid storage tank, and is connected to the auxiliary electronic expansion valve 9, the economizer 6 and the enthalpy increasing air port of the enthalpy increasing compressor 2 in sequence. The indoor throttling heat conversion component is connected to one end of the refrigerant pipeline of the water side heat exchanger 10; the C end of the four-way valve 3, the first refrigerant pipeline 1A and the other end of the refrigerant pipeline of the water side heat exchanger 10 are connected; one end of the second refrigerant pipeline 1B is connected to the indoor throttling heat conversion component, and the other end is connected to the liquid storage tank; during cooling, the indoor electronic expansion valve works; during heating, the outdoor main electronic expansion valve 81 works.

[0023] A first stop valve and a second stop valve are respectively provided at both ends of the first refrigerant pipeline 1A;

[0024] A third stop valve and a fourth stop valve are respectively provided at both ends of the second refrigerant pipeline 1B.

[0025] like Figure 1 As shown, during cooling, the exhaust port of the compressor, the DE end of the four-way valve 3, the outdoor heat exchanger 4, the second one-way valve 83, the economizer 6, the liquid storage tank 5, the second refrigerant pipeline 1B, the third one-way valve 112, the indoor electronic expansion valve 111, the water-side heat exchanger 10, the first refrigerant pipeline 1A, the CS end of the four-way valve 3, the gas-liquid separator 7 and the return air port of the enthalpy increase compressor 2 are connected in sequence; such a design avoids the problem that the traditional split unit, due to throttling in the outdoor unit, causes the refrigerant to flow through the second refrigerant pipeline at low pressure before evaporating in the indoor unit, avoids the poor deposition of refrigerant in the relatively long second refrigerant pipeline caused by low-pressure non-evaporated refrigerant, and greatly improves the capacity and energy efficiency of the split unit system during cooling.

[0026] like Figure 2 As shown, during heating, the exhaust port of the reheat-increasing compressor 2, the DC terminal of the four-way valve 3, the first refrigerant pipeline 1A, the water-side heat exchanger 10, the fourth check valve 113, the second refrigerant pipeline 1B, the economizer 6, the outdoor main electronic expansion valve 81, the first check valve 82, the outdoor heat exchanger 4, the ES terminal of the four-way valve 3, the gas-liquid separator 7, and the compressor's return air port are sequentially connected. The fourth check valve 113 in the indoor unit is open, preventing refrigerant from flowing through the indoor electronic expansion valve. The first check valve 82 in the outdoor unit is open, allowing refrigerant to pass through the economizer and then be throttled by the outdoor main electronic expansion valve 81. The throttled refrigerant then enters the outdoor heat exchanger for evaporation. This prevents throttling of the indoor unit, which would cause refrigerant to flow through the second refrigerant pipeline at low pressure before reaching the outdoor unit for evaporation. This also prevents undesirable deposition of low-pressure, unevaporated refrigerant in the relatively long second refrigerant pipeline between the indoor and outdoor units, significantly improving the heating capacity and energy efficiency of the split-type system.

[0027] The interiors of the first refrigerant pipe and the second refrigerant pipe are in a high-pressure state regardless of whether cooling or heating is being operated.

[0028] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A cooling and heating heat pump system, characterized in that: It includes an outdoor unit, an indoor unit, a first refrigerant pipeline and a second refrigerant pipeline. The outdoor unit includes a heat-increasing compressor, a four-way valve, an outdoor heat exchanger, a liquid storage tank, an economizer, a gas-liquid separator, an outdoor throttling conversion assembly, and an auxiliary electronic expansion valve. The four-way valve includes a C end, a D end, an E end, and an S end. The outdoor throttling conversion assembly includes an outdoor main electronic expansion valve, a first check valve, and a second check valve. The outdoor main electronic expansion valve and the first check valve constitute an outdoor throttling one-way branch and are connected in parallel with the second check valve. The indoor unit includes a water-side heat exchanger and an indoor throttling conversion assembly, the indoor throttling conversion assembly includes an indoor electronic expansion valve, a third one-way valve and a fourth one-way valve, the indoor electronic expansion valve and the third one-way valve constitute an indoor throttling one-way branch and are connected in parallel with the fourth one-way valve; One end of the outdoor throttling conversion component is connected to the outdoor heat exchanger, and the other end is connected to the economizer and the liquid storage tank, and is connected to the enthalpy increase air port through the auxiliary electronic expansion valve and the economizer. The indoor throttling heat conversion component is connected to one end of the refrigerant pipeline of the water side heat exchanger; the C end of the four-way valve, the first refrigerant pipeline and the other end of the refrigerant pipeline of the water side heat exchanger are connected; one end of the second refrigerant pipeline is connected to the indoor throttling heat conversion component, and the other end is connected to the liquid storage tank; during cooling, the indoor electronic expansion valve works; during heating, the outdoor main electronic expansion valve works.

2. A cooling and heating heat pump system according to claim 1, characterized in that: A first stop valve and a second stop valve are respectively provided at both ends of the first refrigerant pipeline; A third stop valve and a fourth stop valve are respectively provided at both ends of the second refrigerant pipeline.

3. A cooling and heating heat pump system according to claim 1 or 2, characterized in that: During cooling, the exhaust port of the enthalpy increasing compressor, the DE end of the four-way valve, the outdoor heat exchanger, the second one-way valve, the economizer, the liquid storage tank, the second refrigerant pipeline, the third one-way valve, the indoor electronic expansion valve, the water-side heat exchanger, the first refrigerant pipeline, the CS end of the four-way valve, the gas-liquid separator and the return air port of the enthalpy increasing compressor are connected in sequence; During heating, the exhaust port of the enthalpy increasing compressor, the DC end of the four-way valve, the first refrigerant pipeline, the water side heat exchanger, the fourth one-way valve, the second refrigerant pipeline, the economizer, the outdoor main electronic expansion valve, the first one-way valve, the outdoor heat exchanger, the ES end of the four-way valve, the gas-liquid separator and the return air port of the enthalpy increasing compressor are connected in sequence.

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