JPS63312588A - Slow moving solenoid valve - Google Patents

Abstract

PURPOSE:To slowly move a main valve element at the time of opening and closing operation by controlling a connecting path between a pressure intensifying chamber provided with buffer means for controlling the moving speed of the main valve element and the secondary port side by a pilot valve element. CONSTITUTION:When a pilot valve element 13 is operated by electromagnetic driving to open a valve seat 12, pressure in the periphery of a bellows 7 decreases to be lowered to the secondary pressure P2, so that force in the valve opening direction acts on a main valve element 6. A fluid with pressure P1, however, remains in the bellows 7 to resist the valve opening operation of the main valve element 6. The residual pressure in the bellows 7 gradually escapes through an equalizing hole 8 to the outside of the bellows 7 and finally becomes equal to the secondary pressure P2. As the pressure in the bellows 7 is lowered, the main valve element 6 is gradually separated from a valve seat 5.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a solenoid valve used for opening and closing a fluid passage.

Conventional production technology strain solenoid valves operate the valve body fully open or fully closed immediately by turning on and off the power to the solenoid coil, which causes a sudden pressure difference between the primary and secondary ports. , and eliminate the differential pressure.

When the differential pressure occurs or disappears when the solenoid valve opens and closes, if the differential pressure is large, it may cause unstable operation of the entire fluid circuit or cause unpleasant scratches on the valve body. It may cause noise.

The present invention has been made with attention to the above points, and when the solenoid coil is energized or turned off,
By slowly moving the valve body, sudden generation or disappearance of differential pressure is avoided.

. In order to achieve the above-mentioned objective of occupying the valve body, the present invention provides a main valve body that approaches and separates from the valve seat provided between the primary port and the secondary port of the valve body. A pressure conversion chamber communicating with the valve chamber with the primary port open is provided, and a buffer means for controlling the moving speed of the main valve element by fluid flow path resistance in the pressure conversion chamber is provided, and the pressure conversion chamber and the secondary port are connected to each other. Connect the passage connecting the sides to the electric T.
A configuration is adopted in which the valve is opened and closed using a 61WIA-operated pilot valve body.

■ In Figure 1, the primary port 3 is connected to the valve chamber 2 in the valve body 1.
and a secondary port 4 are provided, and a needle-shaped main valve body 6 is slidably provided to move toward and away from a valve seat 5 between the primary port 3 and the secondary port 4.

7 is a bellows having elasticity as an impact means;
One end is joined to the main valve body 6 by soldering, and the other end is joined to the valve body 1 by spot welding. A minute pressure equalizing hole 8 having a diameter of about 30 μm is formed in the bellows 7 . A bellows 7 serving as an impact means is provided in a pressure conversion chamber 2' that communicates with a valve chamber 2 that opens toward the primary port 3 through a minute gap G between the main valve body 6 and the valve body 1.

A valve seat 12 is interposed between the pipe line 11° 11' connecting the opening 9 of the side portion of the impact means in the valve body l and the opening 10 of the outlet pipe 4', and the valve seat 12 approaches and separates from the valve seat 12. An electromagnetically driven pilot valve body 13 is slidably provided within the plunger pipe 14'.

14 is a solenoid coil, 15 is a suction core, and 16 is a spring.

In the state shown in FIG. 1, the primary pressure P extends from the gap G between the main valve body 6 and the valve body 1 through the pressure equalizing hole 8 to the inside of the bellows 7, which is filled with fluid at this pressure, and the main valve The body 6 is pressed against the valve seat 5.

Next, when the pilot valve body 13 is actuated by electromagnetic drive to open the valve seat 12, the diameter of the valve seat 12 allows a larger flow rate than the flow rate in the gap G, so first, the bellows 7 in the pressure conversion chamber 2' The surrounding pressure decreases to 2 pyrotechnics P2, and a force in the valve opening direction acts on the main valve body 6. However, fluid at a pressure P remains in the bellows 7 and resists the opening operation of the main valve body 6. bellows 7
The residual pressure inside the bellows 7 is gradually released from the pressure equalizing hole 8 to the outside of the bellows 7, and the pressure inside the bellows 7 decreases until it finally becomes equal to the 2 pyrotechnics P2. As the pressure inside the bellows 7 decreases, the main valve body 6 also gradually moves away from the valve seat, and the valve is gradually opened to the state shown in FIG. 2.

When the pilot valve body 13 is closed from the state shown in FIG. Therefore, the main valve body 6 moves in the valve closing direction due to the difference in pressure receiving area. However, since the pressure inside the bellows 7 is still at P8,
The amount by which the main valve body 6 moves toward the valve seat 5 is small, and the valve seat 5 cannot be closed immediately. In other words, fluid gradually flows into the bellows 7 from the pressure equalizing hole 8 provided in the bellows 7. Then, the pressure inside the bellows 7 also rises to P1, and as the pressure rises, the main valve body 6 gradually approaches the valve seat 5 and the valve is closed.

3 and 4 show other embodiments of the invention, which are similar to the embodiments of FIGS. 1 and 2 except that different buffering means are used, and corresponding components have the same reference numerals. It is shown with .

In the valve chamber 2, a cylinder 7' is fixed to the valve body 1, and a cavity 6a is formed on the other side of the main valve body 6 in the axial direction into which the cylinder 7' is slidably inserted. A minute gap 8' is provided between the cylinder 7' and the cavity 6a to limit the speed of inflow and outflow of fluid, and the cylinder 7', the cavity 6a, and the minute gap 8' constitute a buffer means.

FIGS. 5 and 6 show still another embodiment of the present invention, in which a piston 7'' is attached to the valve body 1 in the valve chamber 2 at the strut portion 7a.
The main valve body 6 has a cylindrical cavity 63' into which the piston 7' is slidably inserted. A pressure-equalizing hole 8N is formed in the fixed portion of the piston 7' and the gasket 7b'', and this pressure-equalizing hole 8'' limits the speed of inflow and outflow of fluid. , the cavity 6a' and the pressure equalizing hole 8' constitute a buffer means.

On each side, the sliding speed of the valve body can be set as appropriate by changing the diameter of the pressure equalizing hole, the width of the gap, the volume of the buffer means, etc.

FIG. 7 shows an example of use in which the slow-acting solenoid valve according to the present invention is incorporated into a multi-air conditioner using a heat pump, which consists of one outdoor unit and a plurality of indoor units.

A is an outdoor unit, B is an indoor unit, C is a compressor, D
is a four-way reversing valve, E is a slow-acting electromagnetic valve used to prevent liquefaction of the refrigerant, and F is an electric expansion valve. The solid line with the symbol in the figure is during cooling;
The broken line shows the flow of refrigerant during heating. In this system, during heating, the slow-acting solenoid valve E is opened and the indoor unit
A high-temperature, high-pressure refrigerant is supplied to the Even during cooling, this slow-acting electromagnetic valve E is opened to allow the refrigerant, which has become heated vapor, to flow into the compressor C.

In this multi-system, if there is an indoor unit B that is not used during heating, the corresponding solenoid valve E is closed to stop the supply of refrigerant. In this case, the corresponding expansion valve F is opened to prevent refrigerant from accumulating in the indoor unit B, but in this case, both sides of the solenoid valve E connected to the high pressure side of the compressor C are A large pressure difference will be applied to the
Next, when the solenoid valve is opened to use the indoor unit I-B, a large amount of refrigerant suddenly tries to pass through, causing unpleasant refrigerant friction when using a conventional fully closed-fully open type solenoid valve. Although noise will be generated, by using the slowly moving solenoid valve E of the present invention, it is possible to prevent the generation of such scraping noise.

As described above, the present invention provides a main valve element that comes into contact with and separates from a valve seat provided between a primary port and a secondary port in the valve body, and the primary port is connected to the valve body. A pressure conversion chamber communicating with the opened valve chamber is provided, and a buffer means for controlling the moving speed of the main valve body by fluid flow path resistance is provided in the pressure conversion chamber, and the pressure conversion chamber and the secondary port side are connected. Since the passage is opened and closed by an electromagnetically driven pilot valve element, the main valve element can be moved gradually during the opening and closing operation, and the generation or disappearance of differential pressure can be gradually controlled.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing one embodiment of the slow acting solenoid valve of the present invention, Fig. 2 is a cross-sectional view of the same operating state, Fig. 3 is a cross-sectional view showing another embodiment, and Fig. 4 is the same as the above. 5 is a sectional view showing still another embodiment; FIG. 6 is a sectional view showing the same operating state; FIG. It is an explanatory diagram. 1... Valve body, 2'... Pressure conversion chamber, 3... Primary port, 4... Secondary port, 5... Valve seat, 6... Main valve body,
7...Buffer means, 13...Pilot valve body. Patent applicant: Saginomiya Seisakusho Co., Ltd. Figure 3

Claims (1)

[Claims] The valve body is provided with a main valve body that comes into contact with and separates from a valve seat provided between the primary port and the secondary port, and a pressure conversion chamber is provided that communicates with the valve chamber with the primary port open to the valve body. A buffer means is provided in the pressure conversion chamber to control the moving speed of the main valve body by fluid flow resistance, and a passage connecting the pressure conversion chamber and the secondary port side is opened and closed by an electromagnetically driven pilot valve body. slow acting solenoid valve.