JPS5952164A - Refrigerant circuit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a refrigerant circuit, and more particularly to a refrigerant circuit capable of operating in a heating cycle using a heat pump cycle that absorbs heat using an outdoor heat exchanger and a forced refrigerant heating cycle using a burner or the like.

Conventionally, a refrigerant heater such as a burner, which serves as a heat supply source to the refrigerant during heating operation, is incorporated into the cooling cycle, which consists of a compressor, an outdoor heat exchanger, a capillary tube as a refrigerant expansion element, and an indoor heat exchanger, as an air-conditioning system. A lot of things are used.

However, the refrigerant circuit that constitutes such a conventional air-conditioning device has the following two major drawbacks.

That is, first, when the refrigerant is heated, it becomes a high-pressure, high-temperature gas, which causes a phenomenon in which the refrigerant moves to a low-temperature, low-pressure refrigerant circuit section. For this reason, refrigerant flows into the outdoor heat exchanger during heating, resulting in heat that should be transported indoors to be released outdoors. Therefore, as a countermeasure to this, it is necessary to provide a solenoid valve or a check valve at the inlet of the outdoor heat exchanger to prevent refrigerant from flowing in, which complicates the structure.

In addition, even if the solenoid valve or check valve is installed, it is difficult to achieve a perfect sealing structure, and if the amount of accumulation in the outdoor heat exchanger exceeds a specified value, it is necessary to expel it again. This requires a sequence to return this to the heating circuit, which complicates the equipment configuration, which has the disadvantage of not only increasing cost but also decreasing reliability.

Second, it has a refrigerant circuit mechanism that can pump up heat by an outdoor heat exchanger during heat pump cycle operation, and heat pump cycle heating operation using this mechanism and refrigerant heating using a refrigerant heater □ cycle heating operation. The disadvantage is that there is a waste of equipment if it is not used at the same time.

Therefore, in view of the conventional circumstances as described above, the present invention provides a heat pump cycle that absorbs heat using an outdoor heat exchanger,
By configuring a heating cycle that simultaneously operates a forced refrigerant heating cycle using a refrigerant heating element, measures can be taken to prevent heat from being released outdoors during refrigerant heating operation, and in a refrigerant circuit having a cooling cycle, The present invention provides a refrigerant circuit that can effectively utilize a heat pump cycle in a heating cycle.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

The figure is a refrigerant system diagram of an air conditioning system equipped with a refrigerant circuit according to the present invention. In the figure, 1 is a first compressor, 2 is a second compressor, 3 is a four-way valve, and 4 is an outdoor heat exchanger. , 5 is a capillary tube as a refrigerant expansion element, 6 is an indoor heat exchanger, T
is a refrigerant heater as a refrigerant heating element, and 1a is used as a heat source.
No burner. 8 and 9 are electromagnetic valves, 1
0 and 11 are communication pipes.

Here, the first and second compressors 1 and 2 are arranged in parallel with the four-way valve 3, and the second compressor 2 has a solenoid valve 9 interposed in its suction side pipe. We are prepared.

The conduit between the second compressor 2 and the solenoid valve 9 and the conduit between the indoor heat exchanger 6 and the capillary tube 5 are interconnected with a series circuit of the refrigerant heater 7 and the solenoid valve 8. has been done.

Then, two compressors 1, 2 . Four-way valve 3. Outdoor heat exchanger4. Capillary tube5. While the cooling cycle is constituted by a circuit in which the refrigerant circulates in the order of the indoor heat exchanger 6,
First compressor1. Four-way valve 3° indoor heat exchanger6. Capillary tube5. A heat pump cycle as a heating cycle is configured by a circuit in which the refrigerant circulates in order of the outdoor heat exchanger 4, and the second compressor 2. Indoor heat exchanger6. A refrigerant heating cycle is constituted by a circuit in which the refrigerant circulates in order of the refrigerant heater 1, and a heating cycle is constituted by the heat pump cycle and the refrigerant heating cycle.

Note that the cooling cycle and the heating cycle are switched by a refrigerant circuit switching operation by the four-way valve 3.

The operation of the heating and cooling device having the above configuration will be explained.

First, in the cooling cycle, the solenoid valve 9 is opened and the compressor 1
, 2 results in complete parallel operation. On the other hand, the solenoid valve 8 is closed, and no refrigerant flows into the refrigerant heater 1. The high-temperature, high-pressure gas refrigerant compressed by the compressors 1 and 2 is sent to the outdoor heat exchanger 4 via the four-way valve 3, where the heat is released and becomes high-pressure liquid refrigerant. Furthermore, the high pressure liquid medium is capillary 7 tube 5
As a result, the refrigerant becomes a low-pressure, low-temperature liquid-gas mixed refrigerant, absorbs heat in the indoor heat exchanger 6, evaporates, and gasifies, and is sucked into the compressors 1 and 2 via the four-way valve 3 to continue cooling operation. In this cooling cycle, the refrigerant flows as shown by the solid arrow in the figure. Next, in the heating cycle, the solenoid valve 9 is closed,
Compressors 1 and 2 operate under different suction conditions. On the other hand, the solenoid valve 8 is opened, and the second compressor 2 is operated to create a circuit configuration in which refrigerant flows through the refrigerant heater 1, and the indoor heat exchanger 6 is also operated to operate a secondary refrigerant circuit. Refrigerant flows as shown by the solid arrow in Figure 1.

That is, in one of the two refrigerant circuits, the high-pressure, high-temperature gas compressed by the first compressor 1 flows to the indoor heat exchanger 6 by switching the four-way valve 3, releases heat indoors, and returns to the high-pressure It becomes a liquid refrigerant. Then, it becomes a low-temperature, low-pressure liquid-gas mixed refrigerant in the capillary tube 5, obtains heat in the outdoor heat exchanger 4, evaporates, becomes a gas refrigerant, and is sucked into the compressor 1, forming a heat pump cycle. The other is the operation cycle of the refrigerant heating circuit, in which the high-temperature, high-pressure gas refrigerant sucked into the second compressor 2 is sent to the indoor heat exchanger 6 via the four-way valve 3, as in the previous cycle. The refrigerant emits heat into the room, becomes a high-pressure liquid refrigerant, passes through the electromagnetic valve 8, is heated by the refrigerant heater 7, becomes a gas refrigerant, and is sucked into the compressor 2, forming a refrigerant heating cycle.

In this case, the second compressor 2 functions as a pump.

According to this configuration, during heating, the two compressors 1 and 2 are operated separately by operating the solenoid valves 8 and 9, thereby generating a refrigerant heating cycle with the refrigerant heater 7 interposed therebetween and a heat pump with the outdoor heat exchanger 4 interposed. When the heat pump cycle is operated simultaneously in one refrigerant circuit and heat can be taken from the outside air, the heat pump cycle has a heating load. Heating operation can be performed in which a large weight is applied to the heating cycle, and the heat pump cycle can be used effectively, allowing powerful heating that is less affected by outside temperature.

In addition, when the outside air condition makes it difficult to absorb heat, the outdoor heat exchanger 4 is maintained at a low temperature and pressure by the action of the heat pump cycle, and the high temperature and high pressure refrigerant heated by the refrigerant heater 7 is transferred to the outdoor heat exchanger. Since it has a configuration that prevents the 4 cores from entering the house, heat is not released in the outdoor heat exchanger 4 as in the conventional case, and therefore the outdoor heat of high temperature and high pressure gas when using a refrigerant heater is not released as in the conventional case. There is no need to add any intrusion prevention structure to the exchanger, the structure does not become complicated, and reliability does not deteriorate.

As explained above, the present invention has a configuration in which the heat pump cycle using the outdoor heat exchanger and the refrigerant heating cycle using the refrigerant heater are simultaneously operated by separately operating the two compressors. It is possible to provide powerful heating, and there is no need to take heat radiation measures with an outdoor heat exchanger, which prevents high costs.Moreover, it is a highly reliable device, and has a cooling cycle. 9
In the medium circuit, a heat pump cycle can be effectively used.

[Brief explanation of drawings]

The figure is a refrigerant system diagram of a heating device to which the refrigerant circuit according to the present invention is applied. G...First compressor 2...Second compressor 3.
...Four-way valve 4-...Outdoor heat exchanger 5...Capillary tube 6...Indoor heat exchanger I...
・Refrigerant heater 8,9...Solenoid valve 10. li・
... Liaison agent Shin Kuzuno - (1 other person) 11. 6\0

Claims (1)

[Claims] A heat pump cycle configuration circuit including a first compressor, an indoor heat exchanger, a refrigerant expansion element, and an outdoor heat exchanger connected together, a second compressor, and the indoor heat exchanger; ,
A refrigerant circuit comprising a refrigerant heating element and a refrigerant heating cycle component circuit interposed and connected, and configured to operate both cycles simultaneously.