CN217844347U

CN217844347U - Refrigeration and heating switching module and heat pump system

Info

Publication number: CN217844347U
Application number: CN202221927063.8U
Authority: CN
Inventors: 李相宏; 卢盛昌; 潘清安
Original assignee: Guangdong Peiwo New Energy Technology Co ltd
Current assignee: Guangdong Peiwo New Energy Technology Co ltd
Priority date: 2022-07-25
Filing date: 2022-07-25
Publication date: 2022-11-18
Anticipated expiration: 2032-07-25

Abstract

The utility model provides a refrigeration and heating switches module and heat pump system, its characterized in that is including heating check valve, first refrigeration check valve, the refrigeration check valve of second and heating the one-way throttle valve, first refrigeration check valve is linked together and is equipped with first external port with the export of heating the check valve, heat the one-way throttle valve with the entry of the refrigeration check valve of second is linked together and is equipped with the external port of second, the export of heating the one-way throttle valve is connected and is equipped with the external port of third with the entry of first refrigeration check valve, the export of the refrigeration check valve of second is connected and is equipped with the external port of fourth with the entry of heating the check valve. By adding the refrigerating and heating switching module on the system, the problems that the EVI enthalpy increasing is not fully utilized to improve the refrigerating capacity and the energy efficiency and reduce the noise during the refrigerating operation are solved, and the heat pump system sharing 1 electronic expansion valve cannot meet the full-working-condition operation regulation requirements of refrigerating and heating.

Description

Refrigeration and heating switching module and heat pump system

Technical Field

The utility model relates to an air source heat pump equipment, more specifically say and relate to a refrigeration and heating switches module and heat pump system.

Background

In the existing frequency conversion air source heat pump system, the environmental temperature range is-35-45 ℃ during heating operation, and the environmental temperature range is 5-45 ℃ during refrigerating operation, namely the heating operation condition is used for heating in winter, and the refrigerating operation condition is used for cooling in summer, so that the frequency conversion air source heat pump system has the characteristics of comfortable temperature, energy conservation and high efficiency. The existing frequency conversion air source heat pump system has the following disadvantages:

1. when the air conditioner is used in places with high refrigerating capacity requirement, the problems of insufficient refrigerating capacity and low energy efficiency exist, and the problem that the higher the ambient temperature is, the more prominent the problem is.

2. When refrigeration is carried out, EVI enthalpy increase is not fully utilized, the running frequency of the variable frequency compressor needs to be increased, and the noise of the compressor is high.

3. The air source heat pump system shares 1 main-path electronic expansion valve, the electronic expansion valve needs to give consideration to the working condition of large refrigeration flow and the working condition of small heating flow, and because the difference of the refrigeration and heating operation working conditions is large, the difference of the refrigerant circulation volume is large, and 1 electronic expansion valve cannot meet the requirement of full-working-condition operation regulation of refrigeration and heating. The full-working-condition operation regulation requirements of refrigeration and heating are met by adopting modes of connecting 1 electronic expansion valve in parallel with 1 one-way valve for regulation or adopting 2 electronic expansion valves for regulation and the like.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the technical problem that will solve is how to simplify the system, and more abundant utilization EVI increases the enthalpy.

In order to solve the above problem the utility model provides a refrigeration and heating switches module, its characterized in that refrigeration and heating switches module is including heating check valve, first refrigeration check valve, second refrigeration check valve and heating the one-way throttle valve, first refrigeration check valve is linked together and is equipped with first external port with the export of heating the check valve, heat the one-way throttle valve with the entry of second refrigeration check valve is linked together and is equipped with the external port of second, the export of heating the one-way throttle valve is connected and is equipped with the external port of third with the entry of first refrigeration check valve, the export of second refrigeration check valve is connected and is equipped with the external port of fourth with the entry that heats the check valve.

A heat pump system comprises a fin heat exchanger, a four-way valve, a gas-liquid separator, a compressor, a horizontal shell and tube heat exchanger, a liquid storage device, a first filter, a refrigerating and heating switching module, an auxiliary electronic expansion valve, a main electronic expansion valve, a plate heat exchanger and a second filter.

The heat pump system is characterized by comprising a plate heat exchanger, a main electronic expansion valve and an auxiliary electronic expansion valve, wherein the plate heat exchanger is provided with a first pipeline and a second pipeline, and a first external port is connected with one end of the first pipeline; the other end of the first pipeline is divided into two paths, one path is connected with the main electronic expansion valve and then connected with the second external port, and the other path is connected with the auxiliary electronic expansion valve and then connected with one end of the second pipeline; the other end of the second pipeline is connected with a liquid supplementing port of the compressor.

Implement the utility model discloses following beneficial effect has: by adding the refrigerating and heating switching module to the system, the problems that the EVI enthalpy increasing is not fully utilized to improve the refrigerating capacity and the energy efficiency and the noise is reduced during the refrigerating operation are solved, and the heat pump system sharing 1 electronic expansion valve cannot meet the full-working-condition operation regulation requirements of refrigerating and heating.

Drawings

FIG. 1 is a diagram of a heat pump system configuration;

FIG. 2 is a schematic view of a heating mode refrigerant flow;

fig. 3 is a schematic view of the refrigerant flow in the cooling mode.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

Fig. 1 is a heat pump system composition diagram, which includes a finned heat exchanger 1, a four-way valve 2, a gas-liquid separator 3, a compressor 4, a horizontal shell-and-tube heat exchanger 5, a liquid reservoir 6, a first filter 7, a cooling and heating switching module 8, an auxiliary electronic expansion valve 10, a main electronic expansion valve 9, a plate heat exchanger 11 and a second filter 12, and meanwhile, temperature sensors, pressure sensors and control switches are arranged at different positions according to control requirements. The refrigerating and heating switching module comprises a heating one-way valve D2, a first refrigerating one-way valve D1, a second refrigerating one-way valve D3 and a heating one-way throttle valve D4, the outlets of the first refrigerating one-way valve D1 and the heating one-way valve D2 are communicated and are provided with a first external port N1, the heating one-way throttle valve and the inlet of the second refrigerating one-way valve are communicated and are provided with a second external port N2, the outlet of the heating one-way throttle valve is connected with the inlet of the first refrigerating one-way valve and is provided with a third external port N3, and the outlet of the second refrigerating one-way valve is connected with the inlet of the heating one-way valve and is provided with a fourth external port N4.

An outlet of the compressor 4 is connected with a D port of the four-way valve, a C port of the four-way valve is connected with an inlet of the horizontal shell-tube heat exchanger 5, and an outlet of the horizontal shell-tube heat exchanger 5 is connected with the first filter 7 and then connected with a fourth external connection port N4; a first pipeline and a second pipeline are arranged on the plate heat exchanger 11, and a first external port N1 is connected with one end of the first pipeline; the other end of the first pipeline is divided into two paths, one path is firstly connected with a main electronic expansion valve 9 and then connected with a second external port N2, and the other path is firstly connected with an auxiliary electronic expansion valve 10 and then connected with one end of the second pipeline; the other end of the second pipeline is connected with a liquid supplementing port of the compressor; the third external port N3 is connected with the second filter and then connected with the fin heat exchanger 1; the other end of the finned heat exchanger 1 is connected with an E port of a four-way valve, and an S port of the four-way valve is connected with a gas-liquid separator and then connected with a compressor.

The working control principle of the specific heating mode and the cooling mode is as follows:

heating mode: fig. 2 is a schematic flow diagram of a heating mode refrigerant, a compressor sucks in a low-temperature and low-pressure gaseous refrigerant, the low-temperature and low-pressure gaseous refrigerant is compressed by the compressor and then changed into a high-temperature and high-pressure gaseous state, the high-temperature and low-pressure gaseous refrigerant enters a horizontal shell-and-tube heat exchanger through a port D and a port C of a four-way valve to heat water, is condensed into a high-temperature and high-pressure liquid state, enters a plate heat exchanger through a liquid reservoir, a first filter and a heating one-way valve to release heat and change into a medium-temperature and high-pressure liquid state, then is divided into 2 paths, a main path sequentially enters a main electronic expansion valve and a heating one-way throttle valve to become a low-temperature and low-pressure gas-liquid mixed state refrigerant, enters a fin heat exchanger through a second filter to absorb outdoor low-pressure heat, is evaporated into a low-temperature gaseous state, enters a gas-liquid separator through a port E and a port S of the four-way valve, and finally returns to the compressor to enter the next cycle. The auxiliary circuit enters the auxiliary electronic expansion valve and then becomes medium-temperature and medium-pressure gas-liquid mixed refrigerant, the medium-temperature and medium-pressure gas-liquid mixed refrigerant enters the plate heat exchanger, absorbs the heat of the liquid refrigerant on the other side of the plate heat exchanger, is evaporated into medium-temperature and medium-pressure gas, and finally returns to the compressor to enter the next cycle.

A refrigeration mode: fig. 3 is a schematic view of a flow direction of a refrigerant in a refrigeration mode, the compressor sucks a low-temperature and low-pressure gaseous refrigerant, the low-temperature and low-pressure gaseous refrigerant is compressed by the compressor and then changed into a high-temperature and high-pressure gaseous state, the low-temperature and low-pressure gaseous refrigerant enters the fin heat exchanger through a D port and an E port of the four-way valve to heat air, is condensed into a high-temperature and high-pressure liquid state, enters the plate heat exchanger through the second filter and the first refrigeration one-way valve to release heat and change into a medium-temperature and high-pressure liquid state, then is divided into 2 paths, a main path enters the main electronic expansion valve to change into a low-temperature and low-pressure gas-liquid mixed refrigerant, enters the shell-tube horizontal heat exchanger through the second refrigeration one-way valve, the first filter and the liquid reservoir to absorb heat of water, is evaporated into a low-temperature and low-pressure gaseous state, enters the gas-liquid separator through a C port and an S port of the four-way valve, and finally returns to the compressor to enter the next cycle. The auxiliary circuit enters the auxiliary electronic expansion valve and then becomes medium-temperature and medium-pressure gas-liquid mixed refrigerant, the medium-temperature and medium-pressure gas-liquid mixed refrigerant enters the plate heat exchanger, absorbs the heat of the liquid refrigerant on the other side of the plate heat exchanger, is evaporated into medium-temperature and medium-pressure gas, and finally returns to the compressor to enter the next cycle.

The EVI enthalpy-increasing function is fully utilized in both cooling and heating. During refrigeration, 1 electronic expansion valve is used for throttling, the requirement of large-flow adjustment of refrigeration is met, the EVI enthalpy-increasing function is utilized during refrigeration, the supercooling degree of a liquid refrigerant is improved, the refrigeration capacity and the energy efficiency ratio are improved, the frequency of a compressor during refrigeration operation can be reduced, and the noise of the compressor is reduced. During heating, 1 electronic expansion valve and 1 one-way throttle valve are connected in series, the electronic expansion valve performs throttling for 1 time, the one-way throttle valve performs throttling for 2 times, and the throttling effect of 2 times is equivalent to that of 1 small electronic expansion valve, so that the small flow regulation of heating is met. The problems that the EVI enthalpy increasing is not fully utilized to improve the refrigerating capacity and the energy efficiency and reduce the noise during the refrigerating operation are solved, and the heat pump system sharing 1 electronic expansion valve can not meet the full-working-condition operation regulation requirements of refrigerating and heating. This system is through reforming transform original system, increases the refrigeration heating switching module in the system, and this module comprises 3 check valves and 1 one-way choke valve, and simple reliable, installation maintenance convenience after the standardized preparation of module. Through tests, the refrigerating capacity of the variable-frequency air source heat pump system is improved by 10-15%, the energy efficiency is improved by 5-10%, the noise is reduced by 2-3%, and the heating energy efficiency at an ultralow ring temperature is improved by 3-5%. The method has good effects of improving the refrigeration capacity and energy efficiency of the air source heat pump and adjusting the heating reliability at ultra-low ring temperature, and has important significance for realizing carbon peak-reaching carbon neutralization.

The above disclosure is only an embodiment of the present invention, and certainly, the present invention should not be limited thereto, and all or part of the processes of the above embodiment can be realized by those skilled in the art, and the equivalent changes made by the claims of the present invention are still within the scope of the present invention.

Claims

1. A refrigerating and heating switching module is characterized by comprising a heating one-way valve, a first refrigerating one-way valve, a second refrigerating one-way valve and a heating one-way throttle valve, wherein outlets of the first refrigerating one-way valve and the heating one-way valve are communicated and provided with a first external port, inlets of the heating one-way throttle valve and the second refrigerating one-way valve are communicated and provided with a second external port, an outlet of the heating one-way throttle valve is connected with an inlet of the first refrigerating one-way valve and provided with a third external port, and an outlet of the second refrigerating one-way valve is connected with an inlet of the heating one-way valve and provided with a fourth external port.

2. A heat pump system comprises a fin heat exchanger, a four-way valve, a gas-liquid separator, a compressor, a horizontal shell and tube heat exchanger, a liquid storage device, a first filter, a refrigerating and heating switching module, an auxiliary electronic expansion valve, a main electronic expansion valve, a plate heat exchanger and a second filter.

3. The heat pump system according to claim 2, comprising a plate heat exchanger, a main electronic expansion valve and an auxiliary electronic expansion valve, wherein the plate heat exchanger is provided with a first pipeline and a second pipeline, and the first external port is connected with one end of the first pipeline; the other end of the first pipeline is divided into two paths, one path is connected with the main electronic expansion valve and then connected with the second external port, and the other path is connected with the auxiliary electronic expansion valve and then connected with one end of the second pipeline; the other end of the second pipeline is connected with a liquid supplementing port of the compressor.