Device and method for stably adjusting water temperature

Abstract

The invention discloses a device and method for stably adjusting the water temperature. The device comprises a water tank, a circulating water pump, a stepping proportional three-way regulating valve, a heat pump system and a control circuit. A water tank outlet communicates with a water inlet of the heat pump system through the circulating water pump, and a water outlet of the heat pump system communicates with a water inlet of the three-way valve. A second water outlet of the three-way valve communicates with the water inlet of the heat pump system through a bypass water route. A first water outlet of the three-way valve communicates with a water tank inlet. The output end of the control circuit is connected with the control end of the three-way valve. According to the device and method, the water temperature can be adjusted in real time through the bypass water route and is obtained by means of calculation according to the real-time evaporating temperature in the heat pump system, and therefore the time-lag phenomenon of calculation results can be avoided, adjustment is made after the actual outlet water temperature is calculated so that small water temperature fluctuation can be guaranteed, and stable regulation is achieved. The device and method for stably adjusting the water temperature can be widely applied to the field of heat pumps.

Description

technical field [0001] The invention relates to the field of heat pumps, in particular to a device and method for stably regulating water temperature. Background technique [0002] In the past, the method of stabilizing the water temperature of the heat pump is usually to perform PID adjustment according to the temperature difference between the inlet and outlet water, so as to achieve the purpose of stabilizing the water temperature. Although this method can meet the purpose of stabilizing the water temperature, the following problems still exist in the actual adjustment: [0003] In the prior art, PID adjustment is often performed according to the temperature difference of the outlet water, and because the water temperature detection in the water tank has a certain time lag, it is easy to cause inaccurate detection, which makes the PID adjustment frequent, and there will be large fluctuations, which affects the stability of the outlet water temperature; In addition, the ex...

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Problems solved by technology

[0003] In the prior art, PID adjustment is often performed according to the temperature difference of the outlet water, and because the water temperature detection in the water tank has a certain time lag, it is easy to cause inaccurate detection, which makes the PID adjustment frequent, and there will be large fluctuations, which affects the stability of the outlet water temperature; In addition, the existing heat pump heating system cannot activate antifreeze protection when the unit is powered off, which may easily lead to cracking of pipelines or casings

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