JPS60140073A - Differential pressure open-close valve - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a refrigeration system with a reduced restart load, and more particularly to a refrigeration system that quickly closes a circuit to prevent condensed refrigerant from flowing into an evaporator when the compressor stops operating. Concerning improvements to differential pressure on/off valves.

When the compressor is stopped, the refrigerant pressure difference before and after the compressor is balanced, and the high pressure of the refrigerant condensed in the condenser is maintained while blocking the flow to the evaporator, which reduces the restart load and improves power efficiency. ” The second is planned.

Conventionally, for this purpose, a solenoid valve is provided between the condenser and the capillary tube, and the solenoid valve is operated by a compressor operation signal so that the valve is opened during operation and closed when stopped. However, in refrigerators that are used for a long time, it is desirable to eliminate the solenoid valve even if its power consumption is small, and the problem of the solenoid valve's suction noise has often been pointed out depending on the location where the refrigerator is installed.

Therefore, in recent years, a technique has been developed that uses a differential pressure on-off valve instead of a solenoid valve.

FIG. 1 shows an example of a refrigeration system using such a differential pressure on/off valve, in which a rotary compressor AX, a condenser B, a capillary tube C, and an evaporator are sequentially connected by a pipe E, and between the condenser B and the capillary tube C. A differential pressure on/off valve V1 is interposed between the evaporator and the rotary compressor A, and a check valve ■2 is interposed between the evaporator and the rotary compressor A. A pressure introduction pipe F+ is connected between the pressure on-off valve V+, and a pressure introduction pipe F2 is connected between the outlet side of the evaporator in front of the check valve 2 and the differential pressure on-off valve 1.

In the differential pressure on/off valve V+, a secondary port 2 and a secondary port 3 are formed in the valve body 1, and a ball valve 5 is connected to the valve seat 4 between them.
come into contact and separate. A diaphragm 8 is provided at the bottom of the valve body 1 with its peripheral edge supported by a lid 6 and a lid 7, and a pressure introduction pipe F1 communicates with a pressure chamber within the lid 6. A valve rod 9 is in contact with the -L side of the diaphragm 8 via a stopper 16, and a spring 15 is provided between the valve rod 9 and the valve body 1. In the illustrated example, a spring retainer 14 attached to the upper end of the valve stem 9 locks a spring 15 and holds the ball valve 5. The valve stem 9 passes through a packing housing 11 provided between the valve body 1 and the valve stem 9 and is sealed with a seal packing 10. Leaf spring 1 for seal packing 10
A gasket presser 12 is provided which presses with 3. A pressure introduction pipe F is connected to the pressure chamber inside the lid 7 on the "-" side of the diaphragm 8.
2 are in communication. - Pipe I from condenser B to crater 2;
E1 is connected to the secondary port 3, and a tube 1is E2 for the capillary tube C is connected to the secondary port 3.

In the above configuration, while the rotary compressor A is in operation, the pressures before and after the check valve 2 are almost the same low pressure state, and the pressure is introduced to both sides of the diaphragm 8 by the pressure introduction pipes F+ and F2, and by the spring 15. A ball valve 5 leaves the valve seat 4 to allow refrigerant to flow into the capillary tube C.

Next, when the rotary compressor A is stopped, the high pressure on the discharge side leaks to the suction side, so the pressure rises on the suction side, but it is stopped by the check valve ■2, so the pressure introduction pipe A high pressure state is introduced to the lower side of the diaphragm 8 through F1, and the ball valve 5 is pushed against the valve seat 4 against the low pressure state above the diaphragm 8 and the pressure from the spring 15. The inflow to is blocked.

By the way, in this structure, the differential pressure on-off valve and the check valve are separate, and two pressure introduction pipes must be drawn from the front and back of the check valve to the pressure on-off valve and connected. There is a problem that the process becomes complicated and piping work such as brazing takes time.

The present invention has been made with attention to the above-mentioned points, and a check valve is integrated into a differential pressure on/off valve.

FIG. 2 shows an embodiment of the present invention, in which a rotary compressor A, a condenser B, a capillary tube C1, an evaporator, and a differential pressure on/off valve V1' are connected by a conduit E.

In other words, the differential pressure on/off valve v1' is the first one in the valve body 20.
inlet 20a1 first outlet 20b1 second inlet 20c,
and a second outlet 20d, and a first inlet 20a.
is connected to the outlet of condenser B by conduit E1 to the first outlet 20b.
is connected to the inlet of the capillary tube C via conduit E2, and the second inlet 20C is connected to the outlet of the evaporator via conduit E3.
The second outlets 20d are respectively connected to the inlets of the rotary compressor A via pipes E4.

A valve seat 21a is provided in the valve chamber 21 between the first inlet 20a and the first outlet 20b, and a ball valve 22 that approaches and separates from the valve seat 21a is provided. The hall valve 22 is a valve body 2
0, and is held by a presser foot 24 of a spring 23 provided between the valve seat 21 and the valve seat 21, and is urged by the spring 23 in a direction away from the valve seat 21. The presser foot 24 is slidably engaged with the seal housing 25.

On the other side of the valve body 20, a metal diaphragm 28 is provided with its peripheral edge supported by an upper lid 26 and a lower lid 27, and a pressure chamber R1 and a pressure chamber R2 are provided on both sides of the diaphragm 28.
The second inlet 20c communicates with the pressure chamber R1, and the second outlet 20d communicates with the pressure chamber R2.

A check valve ■2 is connected to the diaphragm 28 through the center hole 28a.
′ is fixed by ring projection welding. The check valve main body 29 is located in the pressure chamber R2, and has a valve body 30 that comes into contact with and separates from a valve seat 29a provided in the middle of a passage that opens into both pressure chambers R1 and R2. Reference numeral 29 denotes a sliding cylinder portion 29b extending in the direction of the pressure chamber R1 and sliding against the valve body 20.
has.

An interlocking rod 31 is provided between the check valve main body 29 fixed to the diaphragm 28 and the ball valve 22. 32 is a seal packing, which is pressed against the packing housing 25 by a spring 33. 34 is Hasokinholt.

In the above configuration, when the rotary compressor A is operating, the pressure chamber R] and the pressure chamber R2 are at almost the same pressure, so the ball valve 22 is opened by the force of the spring 23, and the refrigerant flows as shown by the arrow. .

Next, when the rotary compressor A stops, the check valve V2 closes due to the refrigerant flowing backwards, and the pressure in the pressure chamber R2 increases, and when it becomes greater than the sum of the pressure in the pressure chamber R1 and the force of the spring 23, the diaphragm 28 closes the ball valve 22 via the interlocking rod 31, preventing hot refrigerant gas from flowing into the cooler and maintaining the pressure differential.

As explained above, in the present invention, since the check valve is provided inside the differential pressure on/off valve of the refrigeration circuit, the number of brazed parts is reduced, the circuit is simplified, and the response due to the differential pressure is quick. It is.

In particular, in the present invention, since a check valve is provided on the diaphragm that partitions the pressure chamber, the structure can be simplified and manufacturing is easy.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a conventional example, and FIG. 2 is an explanatory diagram showing an embodiment of the present invention. ■1'... Differential pressure on/off valve, 2o... Valve body, 2°a... First inlet, 20b...
・First exit, 2°C...Second entrance, 20d
・Old...Second outlet, 22...Valve body, 23...
... Spring, 28 ... Diaphragm,
31... Interlocking rod, V2'... Check valve. Patent applicant Hideo Takino, representative of Saginomiya Seisakusho Co., Ltd.

Claims (1)

[Claims] A differential pressure on/off valve connected to a pipe, which functions to prevent high-pressure refrigerant from diffusing to a low-pressure part when the refrigeration cycle is stopped, A valve element biased in the valve opening direction by a spring is provided in the valve chamber of the valve chamber to open and close the passage between the two sides, a diaphragm is provided between the second inlet and the second outlet to partition the pressure chamber, and the pressure chamber is divided between the second inlet and the second outlet. A differential pressure on/off valve characterized in that a check valve communicating with a pressure chamber is fixed to the diaphragm, and when the check valve is closed, the diaphragm closes the valve body via an interlocking rod.