JPH05322371A - Water-cooled heat pump cooler - Google Patents

Abstract

PURPOSE:To prevent rising of a discharge gas temperature of a compressor higher than required by limiting the compressor by a continuous controller to a special capacity or less through a pressure switch only when a temperature of warm water is a set temperature or higher of a thermostat, and switching it to a start/stop operation. CONSTITUTION:If a set water temperature of a continuous controller 3 is, for example, 55 deg.C or lower, a high temperature water deciding thermostat 4 does not reach a set value but is at a contact B side and is connected directly to a load-down solenoid valve 12 to be load-down. If the set temperature of the controller 3 is set, for example, to 58 deg.C, when the load is reduced and a load- down signal is output, warm temperature reaches, for example, 59 deg.C, and the thermostat 4 is shifted to a contact A side. Further, when a load of a compressor exceeds 50%, a load deciding LP switch 6 is shifted to a contact A side, a load-down signal is cut-off. When a water temperature rises, the controller 3 outputs a stop signal of the compressor to stop the compressor to prevent rising of discharge gas more than necessary.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water-cooled heat pump pump cooling device capable of extracting hot water of high temperature.

[0002]

2. Description of the Related Art In the conventional control, when a high temperature water load operation of 55 ° C. or higher is performed, a method of supplying high temperature water by compressor capacity control and two-system liquid bypass is adopted. The two-system liquid bypass consisted of a circuit that operates with the discharge gas temperature detector and a circuit that operates with the discharge pressure detector or the operating current detector. In this control, the rise of the compressor discharge gas temperature could not be well controlled when the minimum capacity operation was performed when the high temperature water was set (Japanese Patent Laid-Open No. 295460/1993).

[0003]

In a water-cooled heat pump refrigerating apparatus, under high temperature water load conditions of 55 ° C. or higher, the discharge gas temperature rises as the discharge pressure rises. In the conventional technique, the discharge gas temperature is controlled by performing the capacity control by the two-system liquid bypass. This control method is effective because the discharge gas temperature does not rise in the compressor capacity range of 100 to 50%. However, the load is reduced further and
When it becomes about 5%, the discharge gas temperature rises again due to the rise of the suction gas temperature of the compressor even though the discharge pressure decreases.

The object of the present invention is to limit the capacity control operation of 50% or less of the compressor under a high temperature water load condition of 55 ° C. or higher,
A method of switching the operation of the compressor to start / stop control is to prevent the discharge gas temperature from rising excessively.

[0005]

[Means for Solving the Problems] The hot water temperature is detected to determine whether or not it is high. When the hot water is hot, the capacity control operation is limited to 50% or less in response to an instruction to reduce the capacity of the compressor. , Switching to start / stop operation to prevent excessive rise of discharge gas.

[0006]

[Function] Judgment of high-temperature water is performed with a thermostat.
The judgment of 50% or more and 50% or less of the operating capacity of the compressor is made with the judgment LP switch, and both are connected in series to distinguish them, so it is possible to reliably judge the operation state of 50% or less when hot water is used. I can.

[0007]

EXAMPLES Examples of the present invention will be described below. FIG. 1 is a circuit diagram of a water-cooled heat pump refrigerating apparatus necessary for implementing the present invention.

The capacity control operation of the compressor is carried out by the continuous control controller 3, the load-up solenoid valve 11 and the load-down solenoid valve 12.

The discharge gas temperature thermostat 1 operates the liquid bypass solenoid valve 9 and the discharge gas temperature thermostat 2 operates the liquid bypass solenoid valve 10. The discharge gas temperature thermostat 1 controls the discharge gas temperature.

When the load decreases and the hot water reaches the set value, the hot water begins to rise, so the continuous controller 3
When the set water temperature is less than 55 ° C., the thermostat 4 has not reached the set value yet, is on the B contact side, and is directly connected to the load down solenoid valve 12 to load down.

Next, when the set water temperature of the continuous control controller 3 is set to 58 ° C., when the load is reduced and the continuous control controller 3 outputs a load down signal, the hot water is set to 59.
Since the temperature has reached ℃, the thermostat 4 is moving to the A contact side. When the load of the compressor is 100% to 50%, the contact of the load determination LP switch 6 is on the A contact side and is connected to the load down solenoid valve 12 to load down. The load gradually decreases and the load of the compressor is 50%.
When the load determination LP switch 6 passes, the load determination LP switch 6 moves to the A contact side, the load down signal of the continuous controller 3 is cut off by the load determination LP switch 6 section, and the load down is limited. As a result, the water temperature further rises and the continuous controller 3 issues a compressor stop signal. The signal stops the compressor, preventing the discharge gas from rising more than necessary.

[0012]

EFFECTS OF THE INVENTION According to the present invention, the temperature of the compressor discharge gas is prevented from rising under the conditions of high temperature water and low load of the compressor. Supply is possible.

[Brief description of drawings]

FIG. 1 is a circuit diagram that enables high-temperature water / low-load operation of a water-cooled heat pump refrigeration system according to an embodiment of the present invention.

[Explanation of symbols]

1 ... Discharge gas detection thermostat, 2 ... Discharge gas detection thermostat, 3 ... Continuous control controller, 4 ... High temperature water determination thermostat, 5 ... Discharge gas pressure detector, 6 ...
Judgment pressure detector, 7, 8 ... Timer, 9, 10 ... Liquid bypass solenoid valve, 11, 12 ... Load down solenoid valve.

Claims (1)

[Claims] 1. A water-cooled heat pump refrigerating device comprising a hot water heater, a heat exhaust device, an expansion valve, and a compressor for continuous control, the capacity of the compressor is detected only when the hot water temperature is equal to or higher than a preset temperature of a thermostat. In response to the capacity decrease instruction issued by the continuous control controller, the pressure switch limits the capacity operation to 50% or less, and the compressor discharge gas temperature is required by switching to start / stop operation without performing capacity control by continuous control. A cooling device for a water-cooled heat pump, which is characterized by preventing the above rise.