JPH0648280Y2 - Liquid tank for cooling cycle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a liquid tank incorporated in a cooling cycle of, for example, an air conditioner for an automatic person, and more specifically, from a condenser to a liquid tank. Also, the present invention relates to a liquid tank for a cooling cycle in which pressure oscillation of the system leading to the expansion valve is prevented.

(Prior Art) For example, as shown in FIG. 7, a refrigerant cycle of an air conditioner for an automatic person cools a compressor 2 rotatably driven by a running engine and a high-temperature and high-pressure refrigerant compressed by the compressor 2. Condenser 4 for liquid refrigerant
And an expansion valve 6 that atomizes the refrigerant liquefied by the condenser 4 and sends the atomized refrigerant to an evaporator 8, and an evaporator 8 that vaporizes the atomized refrigerant and cools the air blown into the vehicle interior. .

In such a cooling cycle 10, the liquid tank 12 is often installed in the middle of the pipe extending from the condenser 4 to the expansion valve 6. When the liquid tank 12 is mounted here, the gas-phase refrigerant contained as bubbles in the liquid refrigerant flowing from the outlet pipe 4a of the condenser 4 to the expansion valve 6 is almost completely removed by the gas-liquid separation action of the liquid tank. ,
The adiabatic expansion action and the flow rate control in the expansion valve are performed well.

(Problems to be solved by the invention) However, when such a conventional liquid tank 12 is mounted between the condenser 4 and the expansion valve 6, a sealed vapor phase refrigerant reservoir 14 is provided in the liquid tank 12. Since it is formed, a vibration model is formed in the system between the condenser and the liquid tank, and the vibration model is formed between the pressure in the vapor-phase refrigerant storage section 14 and the pressure in the vapor-phase refrigerant circulation section 16 in the condenser 4. This system may be excited by the pressure difference of 1 and the vibration may occur.

When such vibration occurs, the expansion tank 6 is
A steady flow does not flow from 12, and the flow rate control in the expansion valve 6 may become unstable.

Further, due to such vibration, a repeated load may be applied to the brazing portion of the condenser 4, the liquid tank 12, the expansion valve 6, etc., and the durability of these devices may be significantly reduced. Furthermore, such vibrations also cause noise.

The present invention has been made in order to solve the problems of the prior art, and prevents pressure fluctuations in the system from the condenser to the liquid tank and the expansion valve, and stabilizes the flow rate control in the expansion valve. An object of the present invention is to provide a liquid tank for a cooling cycle, which improves durability of equipment used for the cooling cycle and further prevents noise.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the liquid tank for a cooling cycle according to the present invention cools a high-temperature and high-pressure refrigerant compressed by a compressor into a liquid refrigerant. Gas-liquid separation of a liquid refrigerant containing a gas-phase refrigerant sent from the outlet pipe of the condenser, which is mounted between a condenser and an expansion valve for atomizing the refrigerant liquefied by the condenser and sending it to the evaporator. In a liquid tank for a cooling cycle that operates, a pressure equalizing pipe that communicates with a vapor phase refrigerant circulation portion of the condenser is connected to a vapor phase refrigerant storage portion of the liquid tank.

(Operation) In such a liquid tank for a cooling cycle according to the present invention, in the vapor phase refrigerant reservoir in the liquid tank,
Since the pressure equalizing pipe that communicates with the inside of the vapor phase refrigerant circulation portion of the condenser is connected, the pressure inside the vapor phase refrigerant reservoir portion becomes almost equal to the pressure inside the vapor phase refrigerant circulation portion of the condenser, and the vibration system is excited. There will be no pressure difference. Further, even if a pressure difference occurs between them, the pressure equalizing pipe acts in a dashpot type to act to damp vibrations, so that vibrations increase and durability of the device is reduced, and noise is reduced. It does not cause

(Embodiment) Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings.

1 is a schematic view of a liquid tank for a cooling cycle according to an embodiment of the present invention, FIG. 2 is a configuration diagram of an entire cooling cycle with the liquid tank attached, and FIGS. 3 and 4 are liquids according to the embodiment. FIG. 8 is a schematic front view when the tanks are attached to different types of capacitors, the same members as those shown in FIG. 7 are designated by the same reference numerals, and the description thereof will be partially omitted.

As shown in FIG. 2, a liquid tank 20 for a cooling cycle according to an embodiment of the present invention shown in FIG. 1 is, for example, between a condenser 4 and an expansion valve 6 in a cooling sack 22 of an automobile air conditioner. It has an inlet pipe 24 into which the liquid refrigerant containing the vapor phase refrigerant sent as bubbles from the outlet pipe 4a of the condenser 4 enters, and the refrigerant introduced from the inlet pipe 24 is separated into gas and liquid. Has become.

This cooling tank liquid tank 20 has a casing 21
Inside, there is a liquid phase refrigerant storage section 23 located on the bottom side thereof, and a vapor phase refrigerant storage section 14 located on the upper side thereof. In the liquid-phase refrigerant storage portion 23, there is located a front end side opening portion 28 of the liquid tank outlet pipe 26, from which the liquid-phase refrigerant is sent through the outlet pipe 26 toward the expansion valve 6 shown in FIG. It is like this. Some sort of filter material may be mounted between the opening 25 of the inlet pipe 24 and the opening 28 of the outlet pipe 26 in the liquid tank 20. This is because impurities contained in the refrigerant are filtered.

In the present embodiment, a pressure equalizing pipe 30 that communicates with the inside of the vapor-phase refrigerant circulation portion 16 of the condenser 4 is connected to the vapor-phase refrigerant storage portion 14 of the liquid tank 20.

The condenser 4 serves as a liquid-phase refrigerant by cooling the inlet pipe 4b into which the vapor-phase refrigerant whose temperature and pressure have been increased by the compressor 2 shown in FIG. The heat exchange section 32 and the outlet pipe 4a for sending the liquid phase refrigerant that has been heat-exchanged in the heat exchange section 32 to the liquid tank 20. The heat exchange section 32 has a vapor-phase refrigerant circulation section 16 located near the inlet pipe 4b and a liquid-phase refrigerant circulation section 17 located near the outlet tube 4a. The boundary between the circulation parts 16 and 17 is not always clear, and the liquid-phase refrigerant may exist as bubbles in the refrigerant flowing in the liquid-phase refrigerant circulation part 17.

One end of the pressure equalizing pipe 30 is connected to the vapor phase refrigerant circulation portion 16 located near the inlet pipe 4b of the condenser 4 and the other end is connected to the vapor phase refrigerant reservoir portion 14 of the liquid tank 20. , The insides of these communicate with each other, and both have almost the same internal pressure.

Such a pressure equalizing tube 30 is preferably a thin tube so that a large amount of the refrigerant does not flow therethrough. If it is not a thin tube, a throttle portion having a narrowed flow path is provided in the middle of the pressure equalizing tube. Is preferred. It should be noted that the pressures of the vapor-phase refrigerant circulation portion 16 and the vapor-phase refrigerant storage portion 14 which are communicated by such a pressure equalizing tube 30 do not necessarily have to be the same pressure, and there may be a certain pressure difference. .

Regardless of the type of condenser connected by such a pressure equalizing tube 30, a so-called serpentine type heat exchange section 32 is provided in which the refrigerant flows longitudinally in the deformed tube 34, as shown in FIG. As shown in FIG. 4, the header pipes 36, 37, 38 are connected by a plurality of pipes, and a header pipe type heat exchange section 32 through which a refrigerant flows is provided between these header pipes. You may have it.

In the liquid tank 20 for the cooling cycle according to the present embodiment as described above, the gas-phase refrigerant storage section 14 in the liquid tank 20 has a pressure equalizing pipe communicating with the inside of the gas-phase refrigerant circulation section 16 in the condenser 4. Since 30 is connected, the pressure in the vapor-phase refrigerant storage portion 14 becomes substantially equal to the pressure in the vapor-phase refrigerant circulation portion 16 in the condenser 4, and there is no pressure difference for exciting the vibration system. become. Further, even if a pressure difference occurs between them, the pressure equalizing pipe 30 acts in a dashpot type to act to damp the vibration, so that the vibration increases and the durability of the device is reduced. It does not cause noise. Further, since the vibration is prevented in this way, the refrigerant flow rate control is appropriately performed also in the expansion valve 6.

It should be noted that the present invention is not limited to the above-described embodiments, and various modifications can be considered within the scope of the present invention.

FIG. 5 is a schematic view of a cooling tank liquid tank according to a second embodiment of the present invention, and FIG. 6 is a schematic drawing of a cooling tank liquid tank according to a third embodiment of the present invention.

For example, as in the second embodiment, the outlet pipe 4a of the condenser 4
In the pipe 40 that connects the liquid tank 20a with the inlet pipe 24 of the liquid tank 20a, a pressure equalizing pipe that connects the vapor phase refrigerant reservoir 14 and the vapor phase refrigerant circulation portion 16 in the same manner as the pressure equalizing pipe 30 having the above-described configuration. 30a
May be provided, and the pipe 40 may be doubled.

Further, as in the third embodiment, the other end of the pressure equalizing pipe 30 having one end connected to the vapor phase refrigerant reservoir 14 of the liquid tank 20 is connected to the outlet pipe 2a of the compressor 2 and the condenser 4
You may make it connect with the piping 50 which connects the inlet pipe 4b of this.

Even in such second and third embodiments, the same operation as that of the first embodiment described above is obtained.

[Effects of the Invention] As described above, according to the present invention, the pressure equalizing pipe that communicates with the inside of the vapor-phase refrigerant circulation portion of the condenser is connected to the vapor-phase refrigerant storage portion in the liquid tank. , It is possible to prevent the pressure oscillation of the system from the condenser to the liquid tank and the expansion valve, stabilize the flow control in the expansion valve, and improve the durability of the equipment used in the cooling cycle. In addition, there is an excellent effect that noise due to such vibration can be prevented.

[Brief description of drawings]

1 is a schematic view of a liquid tank for a cooling cycle according to an embodiment of the present invention, FIG. 2 is a configuration diagram of an entire cooling cycle with the liquid tank attached, and FIGS. 3 and 4 are liquids according to the embodiment. FIGS. 5 and 6 are schematic front views when the tanks are attached to different types of condensers, FIGS. 5 and 6 are schematic views of a liquid tank for a cooling cycle according to another embodiment of the present invention, and FIG. 7 is a conventional cooling system. It is a schematic diagram of a liquid tank for cycles. 2 ... Compressor, 4 ... Condenser, 4a ... Outlet pipe, 6 ... Expansion valve, 8 ... Evaporator, 14 ... Gas phase refrigerant storage part, 16 ... Gas phase refrigerant circulation part, 20, 20a ... Liquid tank, 30,30a ... equalizing tube.

Claims (2)

[Scope of utility model registration request] 1. A condenser (4) for cooling a high temperature and high pressure refrigerant compressed by a compressor (2) into a liquid refrigerant,
The condenser (4) is mounted between the condenser (4) and the expansion valve (6) which atomizes the refrigerant and sends it to the evaporator (8), and the refrigerant is sent from the outlet pipe (4a) of the condenser (4). In a cooling cycle liquid tank (20, 20a) that performs a gas-liquid separation action of a liquid refrigerant containing a gas-phase refrigerant, the condenser (4) is provided in a gas-phase refrigerant reservoir (14) of the liquid tank (20, 20a). ), A pressure equalizing pipe (30, 30a) communicating with the vapor phase refrigerant circulation part (16) is connected, and a liquid tank for a cooling cycle. 2. The liquid tank for a cooling cycle according to claim 1, wherein the pressure equalizing pipes (30, 30a) are formed with a throttle part in the middle thereof.