JPS5829823Y2 - Refrigeration equipment - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a pressure reducing device for a refrigeration system, and is suitable for use as a refrigeration system for an automobile air conditioner, for example.

The present invention uses a subcooling degree control valve that detects the degree of subcooling of the refrigerant on the condenser outlet side and adjusts the flow rate of the refrigerant to the evaporator as a pressure reducing device for a refrigeration system, and also It is an object of the present invention to provide an inexpensive refrigeration system with a simple overall configuration and a small number of parts by integrally providing the supercooling degree control valve in the union.

The present invention will be described below with reference to embodiments shown in the drawings.

FIG. 1 shows an example in which the present invention is applied to an automobile air conditioner. Reference numeral 1 denotes a compressor, which is driven by an automobile engine (not shown) via an electromagnetic clutch 1a.

A condenser 2 is installed around the radiator in the engine room of the automobile, and is cooled by a fan (not shown).

Reference numeral 3 denotes a subcooling degree control valve that controls the degree of subcooling of the liquid refrigerant at the outlet of the condenser, and constitutes a pressure reducing device.

Reference numeral 4 denotes an evaporator, which is installed at the bottom of the instrument panel inside the vehicle interior, and is used to cool the air inside or outside the vehicle blown by a fan (not shown), and the cooling air is supplied to the interior of the vehicle from an outlet (not shown). It is designed to blow out.

Reference numeral 5 denotes an accumulator, which separates the refrigerant from the evaporator 4 into gas refrigerant and liquid refrigerant, and allows only the gas refrigerant to be sucked into the compressor 1, and is installed in the engine room of the automobile.

Next, the detailed structure of the three parts of the supercooling degree control valve described above will be explained in the second section.
To explain with the drawings, 6 is an irregularly shaped flat tube that forms a meandering refrigerant passage of the condenser 2, 7 is a corrugated fin that is brazed to the flat tube 6, and 8 is soldered to the refrigerant outlet end 6a of the flat tube 6. 9 is a metal main body case, which is cylindrical, and has a refrigerant inlet passage 10 connected to the outlet side union part 8 of the condenser 2 at one end, A refrigerant outlet passage 11 connected to the inlet side of the evaporator 4 is provided at the other end.

12 is a cylindrical cavity formed in the main body case 9; 13;
is a cylindrical bellows made of phosphor bronze;
A metal conduit 14 is brazed to the seat portion 13a at one end, and a needle valve 15 is brazed to the other end.

The same refrigerant (R-12) as the refrigerant sealed in the refrigeration cycle is put inside the bellows 13 via the conduit 14, and by brazing the end 14a of the conduit 14, the refrigerant inside the bellows 13 is It is sealed to prevent leakage.

The bellows 13 is provided with a serpentine portion 13b on its outer surface so that it can expand and contract.

The bellows 13 is housed in the cavity 12 via a spring 17 so that the needle valve 15 is located within the nozzle portion 16 of the refrigerant outlet passage 11, and is provided on the inner periphery of the cavity 12. Through hole 18a in internal threaded part 12a
By screwing and fixing the adjustment nut 18 with
It is held between the adjustment nut 18 and the spring 17 to prevent it from falling off.

The adjusting nut 18 is provided with a plurality of refrigerant passage holes 18b.

Note that by changing the screwing amount of the adjusting nut 18, the amount of expansion and contraction of the bellows 13, that is, the nozzle portion 16 of the needle valve 15, can be adjusted.
The amount of inward protrusion is changed.

Reference numeral 19 denotes a sealing O-ring, and the main body case 9 is directly fastened to the outer periphery of the outlet side union part 8 in an airtight manner via this O-ring 19 at one end thereof.

Next, the operation of the device of the present invention having the above structure will be explained.

The gas refrigerant compressed by the compressor 1 is condensed into a liquid refrigerant by the condenser 2.

This liquid refrigerant enters the cavity 12 from the refrigerant inlet passage 10 of the supercooling degree control valve 3, passes through the constriction formed between the needle valve 15 and the nozzle part 16, is depressurized, and flows through the refrigerant outlet passage 11. Then, it flows into the evaporator 4.

Then, the refrigerant that has exited the evaporator 4 flows into the accumulator 5, where it is separated into gas refrigerant and liquid refrigerant, and only the gas refrigerant is sent to the compressor 1.

To explain the operation of the subcooling degree control valve 3 in detail, the refrigerant inlet passage 1
The liquid refrigerant flowing in from 0 contacts the bellows 13.

At this time, if the degree of supercooling of the liquid refrigerant is excessive compared to the predetermined degree of supercooling, the refrigerant pressure inside the bellows 13 becomes relatively low compared to the outside of the bellows 13, and the bellows 13 It will shrink due to the load.

Therefore, since the opening area of the throttle section between the needle valve 15 and the nozzle section 16 increases, the flow resistance of the refrigerant decreases,
As a result, the refrigerant flow rate increases and the liquid refrigerant in the condenser 2 enters the accumulator 5, so that the degree of subcooling of the refrigerant on the outlet side of the condenser 2 decreases to a predetermined value.

On the other hand, if the degree of subcooling of the refrigerant on the outlet side of the condenser 2 is too small, the refrigerant pressure in the bellows 13 increases and the bellows 13 expands, so that the constriction between the needle valve 15 and the nozzle part 16 The opening area decreases, and as a result, the flow path resistance of the refrigerant increases, so the refrigerant flow rate decreases and the proportion of liquid refrigerant in the condenser 2 increases.

Therefore, the degree of subcooling of the refrigerant will increase to a predetermined value.

Therefore, the refrigeration cycle is always efficiently operated in the optimum subcooling degree range.

3 and 4 show another embodiment of the present invention, in which the main body case 9 in the previous embodiment is abolished, and the function of the main body case 9 is integrated into the outlet side union part 8. This is what I did.

Reference numeral 20 denotes a lid having a refrigerant outlet passage 11 and a nozzle portion 16, and an O
The ring 19 is used to securely fasten the ring 19 in an airtight manner.

Bellows 13, spring 17, and adjustment nut 18
is housed in a space 12 formed by the cylindrical portion 8a, and a nut 18 is screwed into a female threaded portion 8b on the inner periphery of the cylindrical portion 8a.

The bellows 13 is pressed against the stepped portion 8C of the outlet side union portion 8 by the force of the spring 17.

Further, since an elliptical passage 8d having substantially the same shape as the flat tube 6 is formed in the outlet side union portion 8, the refrigerant passes through the side of the bellows 13 through this passage 8d.

Note that the supercooling degree control valve 3 is not limited to a bellows type, but may be a diaphragm type.

Furthermore, it goes without saying that the present invention can also be applied to uses other than automotive air conditioning.

As described above, according to the present invention, since the outlet side union part of the condenser and the supercooling degree control valve are integrated,
Compared to the case where the subcooling degree control valve is installed as a separate part in the refrigeration cycle, the number of parts can be reduced and the overall configuration can be simplified. This has the excellent effect of providing an inexpensive refrigeration device.

[Brief Description of the Drawings] Fig. 1 is a diagram of a refrigeration cycle to which the present invention is applied, Figs. 2 and 3 are partial sectional views showing other embodiments of the device of the present invention, and Fig. 4 is a diagram of a refrigeration cycle to which the present invention is applied. It is a sectional view taken along the line A-A of FIG. 1... Compressor, 2... Condenser, 3...
...supercooling degree control valve, 4...evaporator, 8.
...Exit side union part.

Claims (1)

[Scope of utility model registration request] In a refrigeration system constituted by a closed circuit in which a compressor, a condenser, a pressure reducing device, an evaporator, and an accumulator are sequentially connected, the degree of supercooling control is performed as the pressure reducing device to control the degree of supercooling of the refrigerant at the outlet of the condenser. A refrigeration system characterized in that a valve is used, and the subcooling degree control valve is integrated into an outlet side union part of the condenser.