JPS5832302B2 - Refrigerant gas flow control valve device in cooling equipment, etc. - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention aims to reduce the amount of high-pressure refrigerant gas supplied to the evaporator side after being compressed by a compressor and liquefied through a condenser in a cooling system, a refrigeration system, etc., especially a cooling system for automobiles. This invention relates to a valve device that properly controls the valve.

In this type of cooling device, a certain amount of refrigerant gas is sealed in a high pressure circuit and a low pressure circuit.

Therefore, when the air conditioner or the like is stopped, the refrigerant gas pressures in both circuits become equal, and when the air conditioner is started, a large amount of refrigerant gas flows into the compressor, increasing the load on the compressor.

As a result, an excessive load is placed on the compressor and prime mover.

Moreover, even during operation, the amount of refrigerant gas flowing into the evaporator is controlled using a thermal expansion valve in, for example, an automobile cooling system, so when driving in an urban area with many traffic lights, the engine speed decreases. As a result, the amount of gas sucked into the compressor is reduced.

Therefore, the pressure on the low pressure side increases, the load on the engine that drives the compressor increases, and the cooling capacity also decreases.

The present invention provides a movable body having a blockage valve that is loosely fitted into a high-pressure side opening and pressurized at a constant level by a pressurizing means, and a means for communicating refrigerant gas between the blockage valve and the movable body and a low-pressure side opening. By providing a throttle in the
The purpose is to appropriately control the flow rate of refrigerant gas to the evaporator side by detecting the pressure on the low pressure side.

Hereinafter, the present invention will be explained in detail with reference to illustrative examples.

First, in FIG. 1, 2 is a compressor driven by a prime mover 1, and 4 is a compressor 2 driven by a high pressure pipe 3.
A condenser 6 connected to the condenser 4 is connected to the condenser 4 via the liquid tank 5 by the high-pressure pipe 3, and is a flow control valve device according to the present invention.

8 is an evaporator connected to the flow control valve device through a low pressure pipe 7, and further connected to the compressor 2 through the low pressure pipe 7.

Next, the flow control valve device 6 will be explained based on FIGS. 2 and 3.

The valve case 9, which has an inverted T-shape, has a high-pressure pipe connection part 10.
and a low-pressure pipe connection part 11, each of which has a high-pressure pipe 3 (not shown).
and the low pressure pipe 7.

The high-pressure side opening 12 has a slightly smaller diameter than the low-pressure side opening 13, and the low-pressure side openings include a lower low-pressure side opening 13a facing the high-pressure side opening 12, and an upper low-pressure side opening 13b passing through the low-pressure pipe 7. It is divided into

Inside the high-pressure side opening 12, a plunger-shaped movable body 15 having a conical shutoff valve 14 on its head (left side in the drawing) with a flange 14a formed at the base moves the shutoff valve 14 into the lower low-pressure side opening 13a. Then, it is loosely fitted.

Reference numeral 16 denotes an inner hole that is blindly penetrated from the high-pressure side end of the movable body 15 to the center thereof.

The inner hole 16 includes a first small hole 17a with a small diameter that opens at the outer periphery of the movable body near the flange 14a of the closure valve 14;
A second small hole 17b, which has a slightly larger diameter than the first small hole 17a and opens toward the outer periphery of the movable body closer to the low-pressure pipe side, communicates with each other.

Furthermore, an ejection hole 18a having a larger diameter than the second small hole communicating with the inner hole 16 is opened in the rear outer periphery of the movable body 15.

Next, an annular groove 18b passing through the ejection hole 18a and a roughly pitched spiral groove 18c extending from the annular groove 18b to the rear end surface of the flange 14a of the closure valve are carved on the outer periphery of the movable body.

Furthermore, the movable body 15 and the high pressure side opening 12 are attached to the blockage valve 14.
A small diameter hole 19 passing through the gap between the opening 13a and the lower low pressure side opening 13a is provided.

At the same time, a stopper 20 having a head 20a that is screwed into the inner surface of the left end of the lower low-pressure side opening 13a is adjustably mounted.

The rear end surface 20b of the stopper 20 is formed into a forest shape and faces the blocking valve 14.

21 is a stopper head 20a and a flange 14a of a blockage valve;
The compression spring 21 installed between the movable body 15
It pressurizes the

Finally, 22 is a throttle provided at the bottom of the upper low-pressure side opening 13b.

Note that 23 is a protective cap.

Since the present invention is configured as described above, it has the following operations and effects.

First, the stopper 20 is adjusted in advance so that the low pressure side pressure becomes a constant value.

When the operation is stopped, the movable body 15 is compressed by the compression spring 2.
1, the small diameter hole 1 is inserted through the blockage valve 14.
Except for 9, the high pressure side opening 12 is closed by a closing valve 14.

When the operation is started, liquefied high-pressure refrigerant gas flows into the high-pressure side opening 12 , while the refrigerant gas remaining in the low-pressure side opening 13 is sucked by the compressor 2 .

However, since the high pressure side is closed, a large amount of refrigerant gas is not drawn into the compressor at once.

At startup, the low-pressure side opening may momentarily become a vacuum state, but the refrigerant gas in the high-pressure side opening passes through the gap between the movable body and the high-pressure side opening and closes the blockage valve. Diameter hole 1
Since it flows to the lower pressure side than 9, there is no risk of impact on the compressor or prime mover.

The pressure of the refrigerant gas on the high pressure side gradually increases, and the movable body 15 moves to the low pressure side against the pressure of the compression spring 21.

Therefore, the refrigerant gas in the high-pressure side opening 12 flows through the inner hole 16 of the movable body, the ejection hole 18a1, the annular groove 18b1, and the spiral groove 18.
C sequentially and flows into the unblocked low-pressure side opening 13a.

Furthermore, when the rotational speed of the compressor (that is, the rotational speed of the prime mover) increases, the first small hole 17a and then the second small hole 17b of the movable body open to the low pressure side, so that refrigerant gas flows to the low pressure side. The flow rate will increase.

However, if the pressure on the high pressure side exceeds a certain value, the blockage valve 1
4 comes into close contact with the rear end surface of the stopper and stops moving.

Therefore, the flow rate of refrigerant gas to the low pressure side does not increase beyond a certain value.

Further, the throttle 22 provided at the bottom of the upper low-pressure side opening 13b allows a large amount of refrigerant gas flowing into the lower low-pressure side opening 13a from the high-pressure side to flow from the evaporator 8 to the compressor 2 through the upper low-pressure side opening 13b. It controls the amount of water flowing into the water to maintain an appropriate amount of water at all times.

As described in detail above, the present invention allows an appropriate amount of refrigerant gas to flow into the compressor during operation by maintaining the low pressure side pressure at a constant value.

Furthermore, it is possible to prevent a large amount of refrigerant gas from flowing into the compressor during startup, thereby avoiding impact on the compressor and prime mover.

Therefore, for example, when the present invention is implemented in an automobile cooling system, the low pressure side pressure is changed to 2 to 9/9 by taking into account the characteristics of fluorocarbon gas.
If cyrY is set as standard, the engine speed will be 1100.
Orp or higher, the low pressure side pressure always maintains around 2 KSi'/ca.

Therefore, regardless of whether the vehicle is a large vehicle (displacement (2000 cc or more)) or a small vehicle, the cooling effect is extremely good depending on the vehicle speed, even when driving in the city or at high speed.

Furthermore, since pressure control, which conventionally required 2 to 3 minutes, can be performed within 1 second at startup, the cooling effect is excellent.

As a result, it is effective in reducing fuel consumption and extending the life of the cooling system and engine.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of the cooling device, FIG. 2 is a front vertical sectional view of the flow control valve device, and FIG. 3 is a front view of the movable body. 1... Prime mover, 2... Compressor,
3... High pressure pipe, 4... Capacitor, 6
...Liquid tank, 7...Low pressure pipe,
12...High pressure side opening, 13...Low pressure side opening, 13a...Lower low pressure side opening, 13
b... Upper low pressure side opening, 14... Closure valve, 15... Movable body, 16... Inner hole, 17a... First small hole, 17b...Second small hole, 18a...Blowout hole, 18b...
・Annular groove, 18G...Spiral groove, 19...
・Minor diameter hole, 20... Stopper, 21...
・Compression spring, 22... Restriction.

Claims (1)

[Scope of Claims] 1. A movable body 15 that is constantly pressurized by a pressurizing means 21 and has a shutoff valve 14 that passes through the high-pressure side opening 12 is loosely fitted into the high-pressure side opening 12, and In the movable body 15,
The movable body 15 passes through the inner hole 16 blindly penetrated through the high pressure side end face.
A plurality of small holes 17a, 17b are sequentially opened by the movement of
and an outer circumferential groove 18b that passes through the inner hole 16 and reaches the blockage valve 14. 18c, and the high pressure side opening 1 is provided in the blockage valve 14.
Flow rate of refrigerant gas in a cooling device or the like in which a small diameter hole 19 passing through the gap between the movable body 15 and the opening 13 on the low pressure side is provided, and a throttle 22 is further provided in the opening 13 on the low pressure side. Control valve device.