JPH0718603B2 - Heating and cooling machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a heating / cooling device in which a compressor, an outdoor heat exchanger, a pressure reducing device, an indoor heat exchanger, and the like are connected by a refrigerant pipe, and particularly heating is performed by utilizing combustion heat. Related to the heating and cooling machine.

2. Description of the Related Art The conventional heat pump type heating / cooling device has a drawback that the evaporation temperature of the refrigerant decreases as the outside air temperature decreases during heating operation, and the heating capacity decreases. In order to supplement the heating capacity when the outside air temperature decreases, a method is known in which the refrigerant is heated by combustion heat instead of heat collection from the atmosphere to prevent the heating capacity from decreasing. This method is shown in FIG. 1 is a compressor, 2 is a four-way valve, 3 is an outdoor heat exchanger with a fan, 4 is a check valve, 5 is a pressure reducing device, 6 is an indoor heat exchanger with a fan,
A refrigerant heater 9 having an on-off valve 7 and a burner 8 is provided in parallel with the fan-equipped outdoor heat exchanger 3, and the refrigerant flows in the direction of a solid line arrow during heating and in the direction of a broken line arrow during cooling.

In the above-described configuration, during the heating operation, the gas refrigerant heated and evaporated by the combustion heat of the burner 8 in the refrigerant heater 9 is sent to the indoor heat exchanger 6 with a fan by the operation of the compressor 1 to be radiated and condensed and liquefied. Reflux to the refrigerant heater 9. Further, during the cooling operation, the high-temperature and high-pressure gas refrigerant discharged from the compressor 1 is made to flow into the fan-equipped outdoor heat exchanger 3 to radiate and liquefy it, and the refrigerant pressure is reduced by the decompression device 5 to make the fan-equipped indoor heat exchanger 6 The gas refrigerant that has been sent to and cooled by the heat exchanger is sucked into the compressor 1 and circulated.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the above-described configuration, in the heating operation, not only the fuel such as oil or city gas is burned in the burner 8 and the refrigerant is heated by the refrigerant heater 9, but the refrigerant is conveyed Therefore, there is a problem that the operating cost of the compressor 1 for the operation is increased and the heating operation maintenance cost is increased.

The present invention solves the above conventional problems.
The object of the present invention is to highly reliably construct a heating system with low operation and maintenance costs by circulating the refrigerant without operating the compressor during the heating operation.

Means for Solving the Problems In order to solve the above problems, a heating / cooling machine of the present invention includes a receiver with a pressure introducing valve, a first check valve, a heater, a gas-liquid separator, an indoor heat exchanger, and a second heat exchanger. A heating circuit formed by connecting check valves sequentially in an annular refrigerant pipe and connecting the pressure inlet of the receiver with pressure inlet valve to the heater outlet side and the liquid outlet pipe of the gas-liquid separator to the inlet side of the heater. The compressor, the heater, the outdoor heat exchanger, the receiver with the pressure introducing valve, the pressure reducing device, the indoor heat exchanger, accumulator to form a cooling circuit by connecting the pipes in an annular order, at least the pressure introducing valve. The receiver and the accumulator have a built-in filter, and the gas outlet pipe of the gas-liquid separator has an oil outflow hole.

Effect The present invention has the above-described configuration, by utilizing the evaporation pressure increase generated by heating and evaporating the refrigerant in the heater during the heating operation, the gas refrigerant is pressure-fed to the indoor heat exchanger through the gas-liquid separator, and the indoor heat The liquid refrigerant that has flowed into the exchanger and has been radiated as heat radiation is sent to the receiver with a pressure introducing valve. Here, the pressure introduction valve is also closed by opening the pressure introduction valve and causing the evaporation pressure generated in the heater to act on the receiver unit to send the liquid refrigerant to the heater. In this way, the refrigerant is pressure-fed by utilizing the evaporation pressure increase in the heater during the heating operation, thereby eliminating the conventional operation of the compressor.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, 10 is a receiver with a pressure introducing valve including a pressure introducing valve 11 and a receiver section 12, 13 is a filter provided in the receiver 12, 14 is a receiver 10 with a pressure introducing valve and an inlet side 15 'of a heater 15. A first check valve provided in the refrigerant pipe, 16 is a gas-liquid separator, and the gas-liquid inlet pipe 17 and the outlet side 15 ″ of the heater 15 are connected by a pipe, and the gas outlet pipe 18 is connected via a first on-off valve 19. And the liquid outlet pipe 21 is connected to the refrigerant storage that connects the first check valve 14 and the heater 15. 22 is the indoor heat exchanger 20 and the receiver 10 with a pressure introducing valve. 2 is a second check valve provided in a connection pipe that connects the receiver section 12 of the receiver 10. The receiver 10 with the pressure introducing valve, the first check valve 14, the heater 15, the gas-liquid separator 16, the indoor heat exchanger 20. The second check valve 22 forms an annular passage that is sequentially connected, and the pressure introduction port 23 of the pressure introduction valve 11 is connected to the outlet side of the heater 15. A heating circuit is constructed by connecting to 15 ". 24 is a heater 15
It is a burner installed in.

The discharge pipe 26 of the compressor 25 and the outlet side 15 ″ of the heater 15 are connected to this heating circuit via a third check valve 27, and the inlet side 15 ″ of the heater 15 and the first check valve are further connected. Second to the pipe connecting 14
The on-off valve 28, the outdoor heat exchanger 29, the liquid receiver 30, and the fourth check valve 31 are sequentially connected in series by piping, and the other end of the fourth check valve 31 side is connected to the receiver section 12 of the receiver 10 with a pressure introducing valve. Pipe connection to
Further, an accumulator 33 and a third opening / closing valve 34 are sequentially connected in series to the suction pipe 32 of the compressor 25, and the other end is connected to a pipe connecting the first opening / closing valve 19 and the indoor heat exchanger 20. Reference numeral 35 denotes a pipe connecting the indoor heat exchanger 20 and the second check valve 22 and the receiver unit 12
It is a decompression device provided between. Compressor 25, heater 15, second opening / closing valve 28, outdoor heat exchanger 29, liquid receiver 30, fourth check valve 3
1, a receiver 10 with a pressure introducing valve, a pressure reducing device 35, an indoor heat exchanger 20, a third opening / closing valve 34, and an accumulator 33 are sequentially connected in an annular pipe to form a cooling circuit. 36 is a filter provided in the accumulator 33, 37 is a fan provided in the outdoor heat exchanger 29, and 38 is a fan provided in the indoor heat exchanger 20. As shown in FIG. 2, the gas-liquid separator 16 has an oil outflow hole 39 formed in the lower portion of the gas outlet pipe 18.

In the above-described configuration, the refrigerant circulation system passage for heating is shown by a solid line, and the refrigerant circulation system passage for cooling is shown by a broken line in FIG.

First, during heating operation, the refrigerant burns due to the combustion of the burner 24
It is heated at 15 to evaporate and the evaporation pressure rises. Therefore, the gas refrigerant generated in the heater 15 is the gas outlet pipe in the separator 16.
18 and the first opening / closing valve 19 to flow into the indoor heat exchanger 20.
On the other hand, the liquid refrigerant that has not yet completed evaporation and has exited the heater 15 accumulates in the lower part of the separator 16 and returns to the heater 15 again through the liquid outlet pipe 21. On the other hand, the refrigerant flowing into the indoor heat exchanger 20 is radiated and liquefied by the operation of the fan 38, becomes a liquid refrigerant and flows into the receiver section 12 of the receiver 10 with the pressure introducing valve through the second check valve 22. When the pressure introducing valve 11 is opened to act on the receiver section 12 here, the accumulated liquid refrigerant passes through the filter 13 to remove impurities such as dust in the system passage, and then passes through the first check valve 14. And merges with the liquid refrigerant from the liquid outlet pipe 21, flows into the heater 15, and the heating operation is continued.

By the way, a part of the lubricating oil enclosed in the compressor 25 flows into the heating circuit because it flows out during the cooling operation, and also circulates in the heater 15 together with the liquid refrigerant. If the heater
When the concentration of the lubricating oil flowing in 15 becomes high, thermal decomposition easily occurs in the heater 15, causing a problem in reliability. By the way, since the lubricating oil enters the gas-liquid separator 16 and flows through the oil outlet hole 39 of the gas outlet pipe 18 to the indoor heat exchanger 20 side, the heater 15 may be in an oil rich state. Absent. If this oil outflow hole 39 is not provided, the lubricating oil in the heating circuit is separated together with the liquid refrigerant by the gas-liquid separator 16, and only the circuit of the heater 15, the liquid outlet pipe 21 of the gas-liquid separator 16 is rotated. As a result, the lubricating oil in the heating circuit causes an oil rich state in the heater 15 and the gas-liquid separator 16, which causes a problem that the refrigerant is deteriorated due to thermal decomposition of the lubricating oil in the heater 15.

In this way, the heating operation is carried out by using the evaporation pressure increase in the heater 15 without operating the compressor 25, and the oil outlet hole 39 provided in the gas outlet pipe 18 of the gas-liquid separator 16 is used.
This prevents thermal decomposition that tends to occur due to the concentration of the lubricating oil in the heating circuit increasing in the heater 15, and improves reliability, and the filter 13 of the receiver 10 with pressure introducing valve prevents dust in the heating system passage. Not only to remove impurities such as, to prevent malfunction of the pressure introducing valve 11 etc., but also to filter
Due to the large surface area of 13 itself, the gas-liquid heat transfer heat between the gas refrigerant that has entered the receiver section 12 through the pressure introduction valve 11 and the liquid refrigerant that has entered the receiver section 12 through the second check valve 22. This has the effect of promoting exchange and making the circulation of the refrigerant more reliable.

On the other hand, during the cooling operation, the gas refrigerant discharged at high temperature and high pressure by the operation of the compressor 25 passes through the third check valve 27 and the heater 15,
After passing through the second opening / closing valve 28, the outdoor heat exchanger 29 is radiated by the operation of the fan 37 to become a high-pressure liquid, which passes through the liquid receiver 30 and the fourth check valve 31 into the receiver section 12, and further. Pressure reducer 35
As a result, the low-pressure refrigerant enters the indoor heat exchanger 20. Here, the operation of the fan 38 collects the heat to perform the cooling operation, and the evaporated gasified refrigerant passes through the third on-off valve 34 and the accumulator.
Entering 33, the refrigerant from which impurities such as dust in the cooling circuit are removed by the filter 36 is sucked into the compressor 25 to form a cooling cycle. Therefore, during cooling, the filter 36 in the accumulator 33 prevents dust and the like from being sucked into the compressor, and a filter is provided in the circuit for both heating and cooling. Further, the receiver unit 12 is also used as a liquid reservoir during the cooling operation to cope with the difference in the optimal amount of refrigerant to be filled during heating and during cooling.

Effects of the Invention As described above, according to the heating / cooling machine of the present invention, the following effects can be obtained.

(1) Since the refrigerant is pressure-fed by utilizing the evaporation pressure increase in the heater during the heating operation, it is not necessary to operate the compressor having a large electric input, and thus it is possible to provide heating at a low heating operation maintenance cost.

(2) Filters are provided in both the heating and cooling circuits to prevent deterioration of reliability due to impurities such as dust.

(3) Prevent the concentration of lubricating oil in the heating circuit on the heater,
Prevents deterioration of equipment reliability due to thermal decomposition of lubricating oil

[Brief description of drawings]

FIG. 1 is a circuit configuration diagram of a heating / cooling machine according to an embodiment of the present invention, FIG. 2 is a sectional view of a gas-liquid separator, and FIG. 3 is an overall configuration diagram of a conventional heating / cooling machine. 10 …… Receiver with pressure introducing valve, 13, 36 …… Filter,
14 …… First check valve, 15 …… Heater, 16 …… Gas-liquid separator, 18 …… Gas outlet pipe, 20 …… Indoor heat exchanger, 21 …… Liquid outlet pipe, 22 …… Second reverse Stop valve, 23 …… Pressure inlet, 25 ……
Compressor, 29 …… Outdoor heat exchanger, 33 …… Accumulator,
35: Pressure reducing device, 39: Oil outflow hole.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tatsunori Sakuratake 1006 Kadoma, Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Takashi Sawada 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd. (72) Inventor Jun-ichi Jundo 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor Masahiro Obama 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd.

Claims (1)

[Claims] 1. A receiver with a pressure introducing valve, a first check valve, a heater, a gas-liquid separator, an indoor heat exchanger, and a second check valve are sequentially connected in an annular refrigerant pipe and the receiver with a pressure introducing valve is connected. In the heating circuit formed by connecting the pressure inlet port to the outlet side of the heater and the liquid outlet pipe of the gas-liquid separator to the inlet side of the heater, the compressor, the heater, the outdoor heat exchanger, the pressure inlet valve. A receiver, a pressure reducing device, the indoor heat exchanger, and an accumulator are sequentially connected in an annular pipe to form a cooling circuit, and at least a receiver with a pressure introducing valve and an accumulator are equipped with a filter, and a gas outlet pipe of a gas-liquid separator. Is a heating / cooling machine with an oil outflow hole.