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Reversing control method and device for four-way valve, heat pump system and controller of heat pump system

A technology for reversing control devices and heat pump systems, applied in heat pumps, refrigeration and liquefaction, lighting and heating equipment, etc., can solve problems such as liquid shock, system failure to switch between cooling and heating modes, device damage, etc., to avoid damage effect

Active Publication Date: 2018-09-28
GREE ELECTRIC APPLIANCES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As an important functional part of the heat pump, once the four-way valve fails, the system will not be able to switch between cooling and heating modes
[0003] During the actual operation of the heat pump, under certain circumstances, such as when the system is restarted to operate in cooling or heating mode after a long period of inactivity, there will be gas The liquid two-phase refrigerant is discharged from the compressor and flows through the four-way valve, causing liquid shock
When liquid hammer occurs, the impact pressure of this liquid on the four-way valve is often many times higher than the normal pressure, which is extremely destructive, resulting in damage to the device

Method used

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  • Reversing control method and device for four-way valve, heat pump system and controller of heat pump system
  • Reversing control method and device for four-way valve, heat pump system and controller of heat pump system
  • Reversing control method and device for four-way valve, heat pump system and controller of heat pump system

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Experimental program
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Effect test

Embodiment 1

[0055] figure 1 It is a flow chart of the steps of a four-way valve reversing control method provided in the embodiment of the present application.

[0056] Such as figure 1 As shown, the reversing control method provided in this embodiment is applied to a heat pump system, which is used to use air energy to deliver heat to the room for heating or to enable users to obtain hot water. A cooling state, that is, the four-way valve stopped at the cooling position when the heat pump system was shut down last time. Since heating operation is required, it is necessary to control the reversing of the four-way valve after starting up to switch the four-way valve to the heating position. , for this purpose, this application provides the following steps:

[0057] S1. When the heat pump system starts heating, the control four-way valve remains unchanged.

[0058]That is, when the heat pump system is started in the heating mode, keep the four-way valve in the off state. As mentioned abo...

Embodiment 2

[0086] Figure 5 It is a structural block diagram of a four-way valve reversing control device provided in the embodiment of the present application.

[0087] like Figure 5 As shown, the reversing control device provided in this embodiment is applied to the controller of the heat pump system. The heat pump system is used to use air energy to deliver heat to the room for heating or to enable users to obtain hot water. The heat pump system is used in It is in a cooling state after shutdown, that is, the four-way valve stopped at the cooling position when the heat pump system was shut down last time. Since heating operation is required, it is necessary to control the reversing of the four-way valve after starting up so that the four-way valve switches to For the heating position, for this purpose, the reversing control device of the present application specifically includes a start control module 10 , a parameter acquisition module 20 , a first control module 30 and a second co...

Embodiment 3

[0115] This embodiment provides a controller, which is applied to a heat pump system, wherein the reversing control device provided in the previous embodiment is provided. The reversing control device is used to control the four-way valve of the heat pump system to keep power off when the heating operation of the heat pump system is started; at the same time, obtain the exhaust temperature and exhaust pressure of the compressor of the air source heat pump system; If the temperature difference between the temperature and the saturation temperature corresponding to the exhaust pressure is less than the preset optimal reversing value, the current state of the four-way valve will be temporarily maintained; if the temperature difference is greater than or equal to the preset optimal reversing value, the four-way valve will be controlled Through the valve for reversing. Through the above measures, the four-way valve can be prevented from reversing immediately when there is liquid re...

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PUM

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Abstract

The embodiment of the invention provides a reversing control method and device for a four-way valve, a heat pump system and a controller of the heat pump system. The method and the device are appliedto the heat pump0 system, specifically, when a heating running mode of the heat pump system is started, the four-way valve of the heat pump system is controlled to keep non-electrified; meanwhile, theexhaust temperature and exhaust pressure of a compressor of the air source heat pump system are obtained; if the temperature difference between saturation temperatures corresponding to the exhaust temperature and the exhaust pressure is smaller than the preset optimal reversing value, the current state of the four-way valve is kept temporarily; and if the temperature difference is greater than orequal to the preset optimal reversing value, the four-way valve is controlled to be reversed. With the measures, the four-way valve is prevented from reversing immediately when liquid refrigerant exists in refrigerant output by the compressor, and can be reversed at the proper moment, so that damage to the four-way valve caused by liquid impact is avoided.

Description

technical field [0001] The present application relates to the technical field of refrigeration, and more specifically, to a method and device for reversing control of a four-way valve, a heat pump system and a controller thereof. Background technique [0002] The four-way valve is the most commonly used fluid control element in heat pump systems. It operates under the control of electrical signals. It mainly changes the direction of the fluid in the system through the relative movement between the valve core and the valve body, thereby realizing the switching between cooling and heating modes of the system. , and realize the defrosting function. In the heat pump system, the four-way valve is connected to the exhaust pipe of the compressor. In the normal cooling or heating mode of the whole machine, all the high-temperature and high-pressure gaseous refrigerants are discharged from the compressor and pass through the four-way valve. As an important functional part in the hea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25B41/04F25B49/02F25B30/02F25B41/20
CPCF25B30/02F25B49/02F25B41/20
Inventor 曾奕卢浩贤何林张威罗建飞唐于淞
Owner GREE ELECTRIC APPLIANCES INC