JPH06117784A - Refrigerant heat transfer device - Google Patents

Abstract

(57) [Summary] [Purpose] The purpose is to reduce the concentration of lubricating oil in the entire circulation system leading to the radiator, while the concentration of lubricating oil dissolved in the refrigerant is high in the circulation system where the refrigerant pump operates. . [Composition] A refrigerant heater 5 provided in the vicinity of the combustion burner 1, a separator 7 connected from the refrigerant heater 5 through a discharge pipe 6, and a gas from which the refrigerant gas separated by the separator 7 flows out. A radiator 10 connected to the pipe 8 and the gas pipe 8, a liquid pipe 11 through which the refrigerant condensed in the radiator 10 passes, and a refrigerant pump 13 connected to the liquid pipe 11.
The refrigerant circulation system pressurized to the refrigerant heater 5 and the separator 7 through the return liquid pipe 14 and the expansion device 15 to merge with the liquid pipe 11 and then pressurized by the refrigerant pump 13 to the same. The refrigerant circulation system reaching the refrigerant heater 5 is provided, and the refrigerant pump 13 is configured to operate in the circulation system that concentrates the lubricating oil.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention increases the concentration of lubricating oil present in a heat exchanger or piping of a refrigerant heat transfer device for transferring heat by using a refrigerant pump, particularly in the vicinity of the refrigerant pump, and improves the concentration of the refrigerant pump. The present invention relates to means for increasing durability.

[0002]

2. Description of the Related Art A conventional refrigerant heat transfer device using a refrigerant pump has been incorporated into an air conditioning system for heating as shown in FIG. The system includes a heating channel 31 having a parallel flow channel configuration in which a refrigerant is heated by a combustion burner 30 and a refrigerant passes through, and a refrigerant heater 3 having an upper header 32 and a lower header 33 connected to the heating channel 31.
4 and the upper header 32 of the refrigerant heater 34 to the discharge pipe 3
5, a gas-side cycle consisting of a service valve 36 connected via 5 and a gas pipe 37 connected to the service valve 36 and a radiator 38 connected to the gas pipe 37, and condensation by the radiator 38 A liquid pipe 39 through which the generated refrigerant passes, a service valve 40 from the liquid pipe 39,
Further, the refrigerant is pressurized through the suction port 42 and the discharge port 43 of the refrigerant pump 41 connected to the service valve 40,
It is composed of a liquid side cycle that reaches the lower header 33 of the refrigerant heater 34. Lubricating oil is mixed in the refrigerant circulating through the system in order to ensure the lubricity of the refrigerant pump.

The operation of the above structure will be described. When the refrigerant heater 34 heats the refrigerant and the refrigerant pump 41 is driven, the refrigerant heated by the refrigerant heater 34 is transferred to the radiator 38, and the refrigerant heat transfer is performed. It comes to function as a device.
The lubricating oil mixed in the refrigerant also circulates uniformly at a constant concentration as the refrigerant circulates in the system.

[0004]

However, in the above-mentioned conventional configuration, when lubricating oil is mixed in the refrigerant to the extent that the lubrication of the refrigerant pump 41 is ensured, the thermal characteristics of the refrigerant, that is, the thermal conductivity and the heat transfer characteristics. Refrigerant heater 3
4 and the characteristics of the radiator 38 are deteriorated. The refrigerant-refrigerant heater 34 has a drawback that it concentrates the lubricating oil contained in the refrigerant in the process of evaporating the refrigerant and attaches it to the pipe wall, so that the pressure loss also increases.

The present invention solves the above problems by increasing the concentration of lubricating oil dissolved in the refrigerant in the refrigerant pump used in the refrigerant heat transfer device only in the vicinity of the system of the refrigerant pump. The purpose of the invention is to improve the lubricity of the refrigerant pump and to reduce the adverse effects on the thermal characteristics, pressure loss, etc. due to the circulation of the lubricating oil in the system.

[0006]

In order to achieve the above object, the refrigerant heat transfer device of the present invention concentrates the lubricating oil centering on the entire circulation system leading to the radiator and the separator in the refrigerant circulation system. It is configured by a circulation system, and the refrigerant pump is operated by a circulation system for concentrating the lubricating oil.

[0007]

According to the present invention, due to the above structure, the concentration of the lubricating oil dissolved in the refrigerant is high in the circulation system in which the refrigerant pump operates.
In the entire circulation system leading to the radiator, the concentration of lubricating oil is low, so the lubricity of the refrigerant pump is improved and the adverse effects on the thermal characteristics, pressure loss, etc. due to the circulation of lubricating oil in the system are reduced. be able to.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, a heating channel 2 is provided in the vicinity of a combustion burner 1 and has a parallel flow channel configuration in which a refrigerant passes, and a refrigerant heating having an upper header 3 and a lower header 4 connected to the heating channel 2. And a separator 7 that is connected from the upper header 3 of the refrigerant / refrigerant heater 5 via the discharge pipe 6 and is provided above the refrigerant heater 5.
A gas pipe 8 through which the gas separated by the separator 7 flows,
A service valve 9 provided in the middle of the gas pipe 8,
Further, a gas-side cycle including a radiator 10 connected to the gas pipe 8, a liquid pipe 11 through which the refrigerant condensed in the radiator 10 passes, and a service valve 12 provided in the middle of the liquid pipe 11. The liquid side cycle that is further pressurized by the refrigerant pump 13 connected to the liquid pipe 11 and reaches the lower header 4 of the refrigerant heater 5, and the liquid pipe from the separator 7 through the return liquid pipe 14 and the expansion device 15. 11 and the liquid side cycle which joins 11 and is pressurized by the refrigerant pump 13 and also reaches the lower header 4. Here, the entire refrigerant circulation system reaching the radiator 10 is connected to a gas pipe 8 through which the gas separated by the separator 7 flows, a service valve 9 provided in the middle of the gas pipe 8, and further to the gas pipe 8. Radiator 10
And a liquid pipe 11 through which the refrigerant condensed in the radiator 10 passes, a service valve 12 provided in the middle of the liquid pipe 11, and the liquid pipe 11
Is pressurized by the refrigerant pump 13 connected to the refrigerant heater 5
The liquid side cycle leading to the lower header 4 of FIG. In the refrigerant circulation system for concentrating the lubricating oil, the lubricating oil separated from the refrigerant gas by the separator 7 accumulates in the lower portion of the separator 7, passes through the return liquid pipe 14 and the expansion device 15, and merges with the liquid pipe 11. It is composed of a liquid side cycle which is pressurized by and reaches the lower header 4 as well.

To explain the operation in the above configuration, when the combustion burner 1 is burned at a predetermined combustion amount to drive the refrigerant pump 13, the refrigerant is heated by the refrigerant heater 5 in the heating flow path 2 and a part of the liquid (refrigerant And a lubricating oil) to form a two-phase flow, the liquid and gas are separated from the upper header 3 via the discharge pipe 6 by the separator 7, the refrigerant gas flows out to the gas pipe 8, and the refrigerant is condensed in the radiator 10. The liquid becomes liquid and passes through the liquid pipe 11 to reach the refrigerant pump 13 to form a heating cycle. In addition, the behavior of the lubricating oil will be described. Since the lubricating oil is generally selected and used with high solubility, the lubricating oil is separated from the refrigerant when the refrigerant is in the gas phase. In this embodiment, the refrigerant heater 5 in which the refrigerant is largely vaporized becomes a gas phase refrigerant and a liquid phase containing a high concentration of lubricating oil, and the separator 7 separates the gas phase and the liquid phase from each other. The gas phase containing almost no gas reaches the radiator 10 through the gas pipe 8, is condensed and is returned to the refrigerant pump 13 through the liquid pipe 11,
On the other hand, the liquid phase containing the lubricating oil at a high concentration is accumulated in the lower part of the separator 7 and flows into the refrigerant pump 13 via the return liquid pipe 14 and the expansion device 15. The expansion device 14 is the radiator 10
It is provided so that the entire refrigerant circulation cycle up to and the circulation amount of the refrigerant return liquid from the separator 7 are set to optimal values.

With the above-described structure, in order to ensure the lubricity of the refrigerant pump 13, the lubricating oil added to the refrigerant circulating in the refrigerant heat transfer device has a sufficiently high concentration in the vicinity of the refrigerant pump 13, and the lubricating oil While ensuring lubricity,
Since the remaining portion can sufficiently reduce the concentration of the lubricating oil, the heat transfer capacity of the refrigerant heat transfer device can be secured.

Another embodiment of the present invention will be described with reference to FIG. This embodiment defines the method of flowing into the lower header 4 of the refrigerant heater 5, and the other points are the same as the previous embodiments. The inflow of the refrigerant liquid from the refrigerant pump 13 into the lower header 4 of the refrigerant heater 5 is performed by the end plate 16 that seals the end surface of the lower head 4 and the ejection pipe 1 fixed to the end plate 16.
7, and the diameter of the ejection pipe 17 is set sufficiently smaller than the diameter of the lower header 4. The refrigerant heater 5 of the present embodiment has a parallel flow type heating flow path 2 and constitutes a lower header 4 having a sufficiently slow flow in order to uniformly flow into the heating flow path 2. When it is carried out for a long time, a phenomenon occurs in which the lubricating oil stays in the lower header 4 and it becomes difficult for the refrigerant to flow. This phenomenon is inconvenient for the lubrication of the refrigerant pump 13 and the circulation of the entire refrigerant. In this embodiment, these problems are solved. Lubricating oil stays in the lower header 4 by stirring inside the lower header 4 while maintaining the pressure equalizing effect of the lower header 4. And the lubricating oil is effectively returned to the refrigerant pump 13.

Another embodiment of the present invention will be described with reference to FIG. In this embodiment, the liquid pipe 11 and the lower head 4 are connected to the refrigerant pump 1.
3 is the same as the first embodiment except that it is connected via the diaphragm device 18 to the side opposite to the connection with 3. The purpose of this embodiment is to prevent the lubricating oil from staying in the lower header 4 and making it difficult for the refrigerant to flow, as described in the previous embodiments. Therefore, a flow that flows through the lower header 4 is generated by connecting the liquid pipe 11 and the lower header 4 to the side opposite to the connection with the refrigerant pump 13 via the expansion device 18, and the lubricating oil flows downward. It is configured so that the lubricating oil is effectively returned to the refrigerant pump 13 by preventing the lubricating oil from staying in the lidder 4.

[0013]

As is apparent from the above description, the present invention has the following effects.

(1) In the circulation system in which the refrigerant pump operates, the concentration of the lubricating oil dissolved in the refrigerant is high, and in the entire circulation system to the radiator, the concentration of the lubricating oil is low. Further, it is possible to increase the temperature and reduce the adverse effects on the thermal characteristics, the pressure loss, etc. due to the circulation of the lubricating oil in the system.

(2) By stirring the inside of the lower head of the refrigerant heater, the lubricating oil is prevented from staying in the lower head, and the lubricating oil can be effectively returned to the refrigerant pump.

(3) By creating a flow through the lower header, the lubricating oil can be prevented from staying in the lower header, and the lubricating oil can be effectively returned to the refrigerant pump.

[Brief description of drawings]

FIG. 1 is a system configuration diagram of a refrigerant heat transfer device according to an embodiment of the present invention.

FIG. 2 is a partial cross-sectional view of a refrigerant heater of a refrigerant heat transfer device according to an embodiment of the present invention.

FIG. 3 is a system configuration diagram of a refrigerant heat transfer device according to an embodiment of the present invention.

FIG. 4 is a system configuration diagram of a conventional refrigerant heat transfer device.

[Explanation of symbols]

 1 Combustion Burner 2 Heating Channel 3 Upper Header 4 Lower Header 5 Refrigerant Heater 6 Discharge Pipe 7 Separator 8 Gas Pipe 10 Radiator 11 Liquid Pipe 13 Refrigerant Pump 14 Return Liquid Pipe 15 Throttling Device 17 Jet Pipe 18 Throttling Device

Claims (3)

[Claims] 1. A refrigerant heater provided in the vicinity of a combustion burner, a separator connected from the refrigerant heater via a discharge pipe, a gas pipe through which the refrigerant gas separated by the separator flows out, A radiator connected to a gas pipe, a liquid pipe through which the refrigerant condensed in the radiator passes, a refrigerant circulation system that is pressurized by a refrigerant pump connected to the liquid pipe and reaches the refrigerant heater, and Refrigerant heat transfer system that has a refrigerant circulation system that merges with the liquid pipe from the separator through the return liquid pipe and the expansion device, is pressurized by the refrigerant pump, and also reaches the refrigerant heater, and contains lubricating oil in the refrigerant. apparatus. 2. A refrigerant heater has a heating channel having a parallel flow channel shape, an upper header and a lower header connected to the heating channel, and an end surface of the lower header connected to the refrigerant pump. The refrigerant heat transfer device according to claim 1, wherein a jet pipe fixed to the lower pipe is provided, and the diameter of the jet pipe is set sufficiently smaller than the diameter of the lower header. 3. The lower header of the refrigerant heater and the liquid pipe connected to the radiator are connected to the opposite side of the lower header connection of the refrigerant pump through a throttle device. Refrigerant heat transfer device.