Four-pipe heat pump control system

Abstract

The utility model provides a four-pipe heat pump control system which comprises a pipe A used for providing an inlet path for hot water, a pipe B used for providing a loop for the hot water, a pipe C used for providing an inlet path for cold water, a pipe D used for providing a loop for the cold water, a compressor, a condenser, a liquid storage device, outdoor fins, an evaporator, a gas-liquid separator and a pipeline system. The condenser is connected with the pipe A and the pipe B through the pipeline system, and the evaporator is connected with the pipe C and the pipe D through the pipeline system. By means of the control system, switching of refrigeration and heating can be achieved at any time, refrigeration and heating can be achieved at the same time, and operation of the control system is more stable.

Description

Technical Field

[0001] The utility model relates to the field of heat pump control systems, in particular to a four-pipe heat pump control system. Background Art

[0002] A heat pump is a device that transfers low-grade heat energy to a high-grade heat source. It can first obtain low-grade heat energy from the air, water or soil in nature, and then provide people with usable high-grade heat energy through electricity.

[0003] In the process of implementing the prior art, the inventors found that:

[0004] Currently, most heat pump control systems on the market use a two-pipe control scheme, which allows them to operate in either cooling or heating mode. This system cannot meet complex temperature requirements. Two-pipe heat pumps have low energy efficiency, and sharing a single pipe for both cold and hot water can be detrimental to system stability and increase the risk of system failures.

[0005] Based on this, the present application provides a heat pump control system that can operate stably, can switch between cooling and heating at any time, and can achieve cooling or heating at the same time to solve the problems in the existing technology that the heat pump control system is unstable and cannot meet the needs of switching between cooling and heating at any time and cooling or heating at the same time. Summary of the Invention

[0006] In order to solve the above problems, the utility model proposes a four-pipe heat pump control system.

[0007] The main contents of this utility model include:

[0008] A four-pipe heat pump control system includes a pipe A for providing an inlet for hot water and a pipe B for providing a loop for hot water, a pipe C for providing an inlet for cold water and a pipe D for providing a loop for cold water, and also includes a compressor, a condenser, a liquid reservoir, outdoor fins, an evaporator, a gas-liquid separator and a piping system, wherein the condenser is connected to the pipe A and the pipe B through the piping system, and the evaporator is connected to the pipe C and the pipe D through the piping system, and the piping system includes a four-way valve between the compressor and the condenser, and a valve between the liquid reservoir and the outdoor fins. An electronic expansion valve 1, a pipeline connected to the evaporator is provided between the liquid reservoir and the electronic expansion valve 1, a solenoid valve 1 is provided on the pipeline, an electronic expansion valve 2 is provided between the solenoid valve 1 and the evaporator, the four-way valve includes a high-pressure side and a low-pressure side, the high-pressure side is connected to the air outlet of the compressor, the low-pressure side includes an air inlet connected to the compressor and a first interface and a second interface located on both sides of the air inlet, a gas-liquid separator is provided between the low-pressure side and the air inlet of the compressor, the first interface is connected to the condenser, and the second interface is connected to the outdoor fin.

[0009] Preferably, a first branch pipeline is connected in parallel between the electronic expansion valve 1 and the outdoor fin and between the condenser and the liquid reservoir.

[0010] Preferably, a one-way valve is provided between the condenser and the liquid reservoir, and between the first branch pipeline, the low-pressure side and the gas-liquid separator.

[0011] The beneficial effect of the present invention is that the present invention proposes a four-pipe heat pump control system, through which the cooling and heating switching can be realized at any time, and cooling and heating can be realized at the same time, making the operation of the control system more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is the architecture diagram of the four-pipe heat pump control system of the utility model;

[0013] Description of the accompanying drawings: Four-pipe heat pump control system-100; compressor-1; condenser-2; liquid reservoir-3; outdoor fin-4; evaporator-5; gas-liquid separator-6; four-way valve-71; high-pressure side-711; low-pressure side-712; first interface-713; second interface-714; electronic expansion valve 1-72; solenoid valve 1-73; electronic expansion valve 2-74; one-way valve-75. DETAILED DESCRIPTION

[0014] The technical solution protected by the present utility model is described in detail below with reference to the accompanying drawings.

[0015] See also Figure 1 The utility model proposes a four-pipe heat pump control system 100, including a pipe A for providing an inlet for hot water and a pipe B for providing a loop for hot water, a pipe C for providing an inlet for cold water and a pipe D for providing a loop for cold water, and also includes a compressor 1, a condenser 2, a liquid reservoir 3, outdoor fins 4, an evaporator 5, a gas-liquid separator 6 and a piping system, wherein the condenser 2 is connected to the pipe A and the pipe B through the piping system, and the evaporator 5 is connected to the pipe C and the pipe D through the piping system, and the piping system includes a four-way valve 71 provided between the compressor 1 and the condenser 2, an electronic expansion valve 72 between the liquid reservoir 3 and the outdoor fin 4, and a storage tank. A pipeline connected to the evaporator 5 is provided between the liquid container 3 and the electronic expansion valve 1 72, and a solenoid valve 1 73 is provided on the pipeline. An electronic expansion valve 2 74 is provided between the solenoid valve 1 73 and the evaporator 5. The four-way valve 71 includes a high-pressure side 711 and a low-pressure side 712. The high-pressure side 711 is connected to the air outlet of the compressor 1, and the low-pressure side 712 includes an air inlet connected to the compressor 1 and a first interface 713 and a second interface 714 located on both sides of the air inlet. A gas-liquid separator 6 is provided between the low-pressure side 712 and the air inlet of the compressor 1. The first interface 713 is connected to the condenser 2, and the second interface 714 is connected to the outdoor fin 4.

[0016] Preferably, a first branch pipeline is connected in parallel between the electronic expansion valve 72 and the outdoor fin 4 and between the condenser 2 and the liquid storage tank 3.

[0017] Preferably, a one-way valve 75 is provided between the condenser 2 and the liquid storage 3 , and between the first branch pipeline, the low-pressure side 712 and the gas-liquid separator 6 .

[0018] Preferably, a return air pressure gauge is provided between the gas-liquid separator 6 and the compressor 1 for testing the pressure of the refrigerant input into the compressor 1 .

[0019] Specifically, when heating is required in the four-pipe heat pump control system 100, the compressor 1 discharges high-temperature and high-pressure gaseous refrigerant to the four-way valve 71, and then connects to the condenser 2 through the first interface 713 of the four-way valve 71. The heat is condensed and released through the condenser 2 to heat the hot water obtained from the A tube and discharged through the D tube to produce hot water for the user. The refrigerant condensed into liquid flows to the outdoor fins 4 through the one-way valve 75, the liquid storage tank 3, and the electronic expansion valve 1 72, evaporates and absorbs heat from the air. The evaporated gaseous refrigerant passes through the second interface 714 of the four-way valve 71, the low-pressure side 712, and the gas-liquid separator 6 and returns to the compressor 1 to complete the cycle.

[0020] It should be noted that when heating is required, solenoid valve 1 on the pipeline connecting liquid reservoir 3 and electronic expansion valve 1 72 is closed. The first branch pipeline between electronic expansion valve 1 72 and outdoor fin 4 and the first branch pipeline between condenser 2 and liquid reservoir 3 remain unobstructed, allowing the electronic expansion valve to continue regulating the refrigerant flow.

[0021] When cooling is required in the four-pipe heat pump control system 100, the compressor 1 discharges high-temperature and high-pressure gaseous refrigerant to the four-way valve 71, and then flows to the outdoor fins 4 through the second interface 714 of the four-way valve 71, releases heat through condensation, and discharges heat into the air. The condensed liquid refrigerant passes through the electronic expansion valve 1 72, the solenoid valve 1 73, and the electronic expansion valve 2 74 to the evaporator 5, where it evaporates and absorbs heat, cooling the cold water obtained from the C pipe and discharging it through the D pipe to produce cold water for the user. The evaporated gaseous refrigerant passes through the gas-liquid separator 6 and returns to the compressor 1 to continue circulating.

[0022] Specifically, when the four-pipe heat pump control system 100 needs to cool and heat simultaneously, the compressor 1 discharges high-temperature and high-pressure gaseous refrigerant to the four-way valve 71, and then connects to the condenser 2 through the first interface 713 of the four-way valve 71, condenses and releases heat through the condenser 2, heats the hot water obtained from the A tube, and is discharged through the D tube to produce hot water for the user. The condensed liquid refrigerant passes through the electronic expansion valve 1 72, the solenoid valve 1 73, and the electronic expansion valve 2 74 to the evaporator 5, evaporates and absorbs heat in the evaporator 5, cools the cold water obtained from the C tube, and is discharged through the D tube to produce cold water for the user. The evaporated gaseous refrigerant passes through the gas-liquid separator 6 and returns to the compressor 1 to continue to circulate continuously.

[0023] It should also be noted that the control system also includes a controller for controlling the status of the four-way valve 71, electronic expansion valve 1 72, electronic expansion valve 2 74, and the solenoid valve. In a preferred embodiment provided herein, a CAREL uPC3 medium programmable controller is used, along with the FBD programming language (which offers enhanced readability, simplifies the development process, and reduces technical requirements) and the ST programming language (which offers greater flexibility and expressiveness, and improves program portability). The pGD1 text screen is also provided, providing enhanced operability and greater cost-effectiveness.

[0024] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A four-pipe heat pump control system, characterized in that: It includes a pipe A for providing an inlet for hot water and a pipe B for providing a loop for hot water, a pipe C for providing an inlet for cold water and a pipe D for providing a loop for cold water, and also includes a compressor, a condenser, a liquid reservoir, outdoor fins, an evaporator, a gas-liquid separator and a piping system. The condenser is connected to the pipe A and the pipe B through the piping system, and the evaporator is connected to the pipe C and the pipe D through the piping system. The piping system includes a four-way valve arranged between the compressor and the condenser, an electronic expansion valve 1 between the liquid reservoir and the outdoor fins, a pipeline connected to the evaporator is provided between the liquid reservoir and the electronic expansion valve 1, a solenoid valve 1 is provided on the pipeline, and an electronic expansion valve 2 is provided between the solenoid valve 1 and the evaporator. The four-way valve includes a high-pressure side and a low-pressure side, the high-pressure side is connected to the air outlet of the compressor, the low-pressure side includes an air inlet connected to the compressor and a first interface and a second interface located on both sides of the air inlet, a gas-liquid separator is provided between the low-pressure side and the air inlet of the compressor, the first interface is connected to the condenser, and the second interface is connected to the outdoor fins.

2. The four-pipe heat pump control system according to claim 1, characterized in that: A first branch pipeline is connected in parallel between the electronic expansion valve 1 and the outdoor fin and between the condenser and the liquid storage.

3. The four-pipe heat pump control system according to claim 2, characterized in that: One-way valves are provided between the condenser and the liquid storage device, and between the first branch pipeline, the low-pressure side and the gas-liquid separator.

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