JPS589739Y2 - Air conditioner equipped with water-cooled heat exchanger - Google Patents

Description

[Detailed description of the invention] The purpose of the invention is to control cooling overload and heating overload of an air conditioner configured with a heat pump type refrigeration cycle, and to prevent various harmful effects caused by overload operation. It is.

Conventionally, this type of air conditioner has had a refrigeration cycle constructed as shown in FIG.

That is, in the figure, 1' is a compressor, 2' is a four-way switching valve, 3' is an air side heat exchanger, 4' is a capillary tube, and 5' is a water-cooled heat exchanger.

With this configuration, during cooling operation, in the case of a cooling overload in which the amount of water passing through the water-cooled heat exchanger 5' decreases or the water temperature increases, the heat dissipation in the water-cooled heat exchanger 5' is reduced. As a result, the high pressure side of the refrigerant gas rises abnormally above the standard point, causing problems such as seizure and damage to the cylinders in the compressor 1', decomposition of the refrigerant gas, and carbonization of the oil. During heating operation, even in the case of heating overload in which the amount of water passing through the water-cooled heat exchanger 5' increases or the water temperature rises, too much heat is absorbed in the water-cooled heat exchanger 5', and the refrigerant gas The high pressure side of the compressor 1' rose abnormally above the standard point, causing problems such as burning and damage to the cylinders in the compressor 1', decomposition of the refrigerant gas, and carbonization of the oil.

The present invention eliminates the drawbacks found in the above-mentioned conventional air conditioners.

To achieve this, the present invention has a compressor, a four-way switching valve,
A heat pump type refrigeration cycle is configured by an air side heat exchanger, a capillary tube, and a water-cooled heat exchanger, and one end is connected to the middle of the water-cooled heat exchanger, and the other end is connected to the capillary tube and the water-cooled heat exchanger. A bypass pipe connected to the water-cooled heat exchanger is provided, and a refrigerant on-off valve for controlling the flow of refrigerant during heating is provided in the bypass pipe, and a refrigerant shutoff valve is provided on the inlet side or outlet side of the water-cooled heat exchanger. , a water supply valve for controlling the flow of the cooling water is provided, and the refrigeration cycle is provided with a detection device that detects the pressure or temperature within the refrigeration cycle and has an operating point set at a high level and an operating point set at a low level. The detection device controls opening and closing of the refrigerant on-off valve and the water supply valve.

Hereinafter, FIGS. 1 and 2 of the drawings showing one embodiment of the present invention will be described.
This will be explained with reference to the diagram.

In the figure, 1 is a compressor, 2 is a four-way switching valve, 3 is an air-side heat exchanger installed indoors, 4 is a capillary tube, and 5 is a water-cooled heat exchanger, which are connected in a ring. This constitutes a heat pump type refrigeration cycle.

The water-cooled heat exchanger 5 includes piping 5a connected to a well or water supply, and is configured to circulate water.

Reference numeral 6 denotes a pressure detection device installed at a location on the high pressure side during heating of the refrigeration cycle, and a double pressure switch 7.
The pressure switch 7a has a low setting operating point, and the pressure switch 7b has a high setting operating point.

A bypass pipe 8a is connected between the middle of the water-cooled heat exchanger 5, the capillary tube 4, and the water-cooled heat exchanger 5, and is provided with a refrigerant on-off valve 8 for controlling the flow of refrigerant.

Reference numeral 9 denotes a water supply valve provided on the water supply side piping 5a of the water-cooled heat exchanger 5.

Here, the pressure switch 7b closes the water supply valve 9 at a high setting operating point, and the pressure switch 7a opens the refrigerant on-off valve 8 at a low setting operating point.

10 is a solenoid valve provided between the connection point of the bypass pipe 8a and the water-cooled heat exchanger 5, and the pressure switch 7a
Closes at the lower setting operating point.

The electrical circuit of the refrigeration cycle constructed as described above is constructed as shown in FIG.

In the figure, 11 is a cooling/heating changeover switch, and compressor 1,
Four-way switching valve 2, pressure switches 7a, 7b, refrigerant on-off valve 8
, a water supply valve 9, and a solenoid valve 10 are connected as shown in the figure.

12 is a capacitor for starting the compressor 1.

In the above configuration, during cooling operation, the refrigerant flows as shown by the broken line arrow, and when heat radiation in the water-cooled heat exchanger 5 is blocked and the high pressure side of the refrigerant gas rises above the initially set standard point, the pressure switch 7a is set to a high level. The operation of the compressor 1 is stopped at the operating point.

When the pressure drops to the high setting return point, the compressor 1 is operated again.

Next, during heating operation, the refrigerant flows as shown by the solid arrow, and when the heat absorption in the water-cooled heat exchanger 5 increases and the high pressure rises, the refrigerant first flows into the bypass pipe 8a at the low setting operating point of the pressure switch 7a. The solenoid valve 8 is opened to reduce heat absorption in the water-cooled heat exchanger 5.

If the amount of water passing through the water-cooled heat exchanger 5 is larger and the water temperature is also higher, the high pressure side of the refrigerant gas will further rise.

When this happens, the upper water supply valve 9 is closed at the high setting operating point of the pressure switch 7b, stopping the flow of water through the water-cooled heat exchanger 5, significantly reducing heat absorption and lowering the pressure.

When the return point of the high setting of the pressure switch 7b is higher than the return point of the low setting of the pressure switch 7a, the pressure of the refrigerant gas reaches the return point of the high setting and the automatic water supply valve 9 is opened. Pour water into container 5.

Further, when the pressure reaches the return point of the low setting of the pressure switch 7a, the solenoid valve 8 closes and the original standard cycle returns.

Further, when the return point of the high setting of the pressure switch 7b and the return point of the low setting of the pressure switch 7a are the same, the solenoid valve 8 and the automatic water supply valve 9 operate simultaneously, and the pressure in the refrigeration cycle is returned to the standard state.

Further, when the return point of the high setting of the pressure switch 7b is lower than the return point of the low setting of the pressure switch 7b, when the pressure reaches the return point of the low setting of the pressure switch 7a, the refrigerant on-off valve 8 is activated, and the bypass piping 8a Close and return to standard cycle.

Further, when the pressure reaches the return point of the high setting of the pressure switch 7b, the automatic water supply valve 9 opens and water is supplied to the water-cooled heat exchanger 5.

In either case, no problem occurs in the refrigeration cycle.

Note that a dual thermostat may be used in place of the dual pressure switches 7a and 7b, or two or one pressure switch and one thermostat may be combined.

Further, the automatic water supply valve 9 may be installed on the drainage side of the water-cooled heat exchanger 5.

With the configuration of the heat pump type refrigeration cycle as described above, even if the high pressure side of the refrigerant gas rises abnormally during cooling operation, overload operation can be prevented by stopping the compressor 1 and lowering the pressure. Also, during heating operation, pressure switch 7
The operation of a and 7 b bypasses the refrigerant gas at a low setting to lower the pressure, and at a higher setting, the water flow to the water-cooled heat exchanger 5 is cut off, thereby lowering the pressure. It is possible to solve problems such as burning and damage of the cylinder, decomposition of refrigerant gas, and carbonization of oil.

Furthermore, during heating operation, even if the pressure rises abnormally, heating operation can be performed without stopping the compressor 1, so that a predetermined capacity can always be exhibited.

As described above, since the air conditioner equipped with the water-cooled heat exchanger of the present invention uses a detection device to operate the compressor intermittently during cooling operation, it is possible to prevent the harmful effects associated with overload operation, and also to prevent harmful effects caused by overload operation. Since overload prevention is performed without interrupting heating operation, comfortable heating can be performed and various adverse effects associated with overload operation can be prevented.

In addition, the detection device stops the operation of the compressor by detecting a high-set operating point during cooling operation, and opens the refrigerant on-off valve by detecting a low-set operating point during heating operation. By operating the water supply valve to close based on the detection of the operating point set at a high level, especially during heating, overload operation is prevented by the operating point set at a high level and the operating point set at a low level of the detection device, thereby ensuring safety. It has various advantages such as improved performance and reliability.

[Brief explanation of drawings]

Fig. 1 is a refrigeration cycle diagram of an air conditioner equipped with a water-cooled heat exchanger according to an embodiment of the present invention, Fig. 2 is a schematic electrical circuit diagram of the same air conditioner, and Fig. 3 is a water-cooled example showing a conventional example. FIG. 2 is a refrigeration cycle diagram of an air conditioner equipped with a type heat exchanger. 1... Compressor, 2... Four-way switching valve, 3
... Air side heat exchanger, 4 ... Capillary tube, 5 ... Water-cooled heat exchanger, 6 ...
...detection device, 8...refrigerant on-off valve, 8a...
...Bypass piping, 9... Water supply valve.

Claims (1)

[Scope of utility model registration request] A heat pump type refrigeration cycle is constituted by a compressor, a four-way switching valve, an air side heat exchanger, a capillary tube, and a water-cooled heat exchanger, and one end is connected to the middle of the water-cooled heat exchanger, and the other end is connected to the middle of the water-cooled heat exchanger. A bypass pipe whose end is connected between the capillary tube and the water-cooled heat exchanger is provided, a refrigerant on-off valve for controlling the flow of refrigerant during heating is provided in the bypass pipe, and a A water supply valve is provided on the inlet side or the outlet side to control the circulation of this cooling water, and the refrigeration cycle is provided with a water supply valve that detects the pressure or temperature within the refrigeration cycle, and has an operating point set at a high level and an operating point set at a low level. 1. An air conditioner comprising a water-cooled heat exchanger which is provided with a detection device having a detection device, and which controls opening and closing of the refrigerant on-off valve and the water supply valve.