JP2002005329A - Solenoid valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solenoid valve that is free from damage to a valve seat and seat packing due to cavitation and from wear of a plunger and a core due to inclination of a valve element. SOLUTION: The solenoid valve comprises a valve body 2 wherein an inflow passage 5 is connected to an inlet 8 of a valve chest 6, an outlet 9 of the valve chest 6 is connected to an outflow passage 7, the outlet 9 is provided with a valve seat 10, and the outflow passage 7 is provided with an orifice 11; a solenoid body 3 wherein a solenoid 12 is arranged in the upper section, a base 14 is arranged under the solenoid 12, and a core 15 is fitted in the solenoid 12; and a valve element 4 wherein a plunger 16 is slidably inserted in the core 15, a valve 17 fixed on the plunger 16 is positioned in the valve chest 6, and an elastic body 18 is arranged to energize the valve 17 toward the valve seat 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic valve which can be used in a high-temperature, high-pressure flow path, for example, an electromagnetic valve which can be effectively used in a cooling path of a mold for injection-molding a synthetic resin.

[0002]

2. Description of the Related Art A high-temperature, high-pressure cooling water, for example, 16 liters, is provided in a flow passage of a cooling device for cooling a mold for injection molding a synthetic resin.
Cooling water of 0.6 MPa (6 Kg · f / cm ² ) or more flows at 0 ° C.

As shown in FIG. 5, a cooling device for cooling a mold for injection-molding a synthetic resin sends cooling water from a water storage tank T containing a heater H to the mold via a pump P and a flow path L1. The cooling water from the mold is returned to the water storage tank T via the flow path L2. Further, the cooling water supply is sent to the water storage tank T via the flow path L5, and the high-temperature water in the water storage tank T is discharged via the flow path L4 to adjust the temperature. When draining water from the system, air is supplied to the water storage tank T via the flow path L3.
, And purge and drain through the flow paths L1 and L2 and the flow path L7. Each flow path is provided with an electromagnetic valve (not shown) to control the flow of cooling water.

As shown in FIG. 6, a conventional solenoid valve 1 includes a valve base 2 having an inflow passage 5, a valve chamber 6, a valve seat 10, and an outflow passage 7, a solenoid 12, a suction member 13, and a base. 1
4. Solenoid body 3 having core 15, plunger 1
6, a valve 17, a seat packing 19, and a valve body 4 having a coil spring 20. The solenoid valve 1 is used by connecting the inflow path 5 and the outflow path 7 to the flow path L of the cooling device.

When the solenoid 12 of the solenoid valve 1 is energized,
The plunger 16 is sucked by the magnetic field until the plunger 16 hits the member 13, the seat packing 19 of the valve 17 is separated from the valve seat 10 against the coil spring 20, and the high-temperature and high-pressure cooling water in the inflow channel 5 flows into the low-pressure outflow channel 7. leak.

The cooling water flowing into the low-pressure outflow passage 7 violently boiles at the portion S of the valve seat 10 and the seat packing 19 to cause cavitation, damaging the valve seat 10 and the seat packing 19 and sealing the valve 17. Make you worse.

Further, the valve 17 and the plunger 16 are pushed in one direction by the cooling water flowing into the valve chamber 6 from the inflow passage 5, and the valve body 4 is tilted, and the upper and lower ends 16a, 16b,
And the cores 15a and 15b wear.

As a result, the valve 17 and the plunger 16 do not slide smoothly, and the opening / closing responsiveness and sealing property of the valve 17 deteriorate. In the worst case, a hole is made in the core 15 and hot water is jetted.

[0009]

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above-mentioned problems of the prior art, and the valve seat and the seat packing are not damaged by cavitation, and the plunger is not damaged. It is an object of the present invention to provide a solenoid valve that can prevent the plunger and the core from being worn out by being inclined.

[0010]

According to the solenoid valve of the present invention, the inflow passage communicates with the inlet of the valve chamber, the outlet of the valve chamber communicates with the outflow passage, a valve seat is formed at the outlet, and the orifice is formed in the outflow passage. Provided with a valve base, a solenoid is provided on the upper part, a base is provided on the lower part of the solenoid, a solenoid body having a core inserted in the solenoid, and a plunger are slidably inserted in the core, The valve fixed to the plunger is located in the valve chamber, and is constituted by a valve body provided with an elastic body for urging the valve toward the valve seat.

According to the present invention having such a configuration, the orifice is provided on the downstream side of the valve seat and the orifice is directly connected to the outflow passage, so that the cavitation is caused in the space between the orifice and the valve seat. This does not occur between the valve seat and the seat packing as in the prior art shown in FIG. As a result, the valve seat is completely prevented from being damaged by cavitation.

Further, in the solenoid valve of the present invention, the inflow path is a valve chamber.
An outlet opened in the middle of the two inlets communicates with the outflow passage, a valve base having a valve seat formed at the outlet, and a solenoid provided at an upper portion, and a lower portion of the solenoid provided at a lower portion of the solenoid. A base is provided, a solenoid body in which a core is fitted in a solenoid, a plunger is slidably inserted in the core, a valve fixed to the plunger is located in a valve chamber, and the valve is moved to a valve seat side. It is composed of a valve body provided with a biasing elastic body.

According to the present invention having the above-described structure, the cooling water flows from the inflow passage into the valve chamber through the two inflow passages (or inlets), and flows into the valve from two opposite directions. Due to the collision, the forces of the cooling water pressing the valve via the two inlets are mutually canceled. Therefore, the valve is not pressed in one direction as in the related art which flows into the valve chamber from one inflow path, and the valve or the plunger is prevented from being inclined.

In practicing the present invention, the elastic body for urging the valve toward the valve seat is constituted by a leaf spring, and the center of the leaf spring is fixed by being sandwiched between the plunger and the valve. The periphery is fixed by being sandwiched between the base of the valve body and the base of the solenoid body.

By using a leaf spring, the valve and the plunger reciprocate accurately in the vertical direction, and wear and damage due to the inclination of the valve and the plunger are prevented.

In implementing the present invention, all of the above-described configurations can be combined. That is, the inflow passage communicates with the inlet of the valve chamber, the outlet of the valve chamber communicates with the outflow passage, a valve seat is formed at the outlet, and a valve base provided with an orifice in the outflow passage, and a solenoid is provided at the top. A base is provided at a lower portion of the solenoid, a solenoid body having a core inserted in the solenoid, a plunger inserted slidably in the core, and a valve fixed to the plunger located in a valve chamber. And a valve body provided with an elastic body for urging the valve seat toward the valve seat, wherein the inflow passage communicates with two inlets of the valve chamber, and an outlet opened in the middle of the two inlets. Are connected to the outflow passage, and an elastic body for urging the valve toward the valve seat is constituted by a leaf spring. A center portion of the leaf spring is fixed by being sandwiched between the plunger and the valve. Is fixed between the valve body and the base of the solenoid body. That may be a solenoid valve.

[0017]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 1, a solenoid valve 1 includes a valve base 2,
It comprises a solenoid body 3 and a valve body 4. In addition,
FIG. 1 shows a so-called “open” state in which the valve 17 is separated from the valve seat 10, and FIG. 4 shows a so-called “closed” state in which the valve 17 is seated on the valve seat 10.

An inflow passage 5, a valve chamber 6, and an outflow passage 7 are formed in the valve base 2. As shown in FIG. 2, the inflow path 5 branches into two paths 5a and 5b, and the two inlets 8a and 8 of the valve chamber 6 are formed.
b, and an outlet 9 is provided between the inlets 8a and 8b. A valve seat 10 is formed around the outlet 9, the outlet 9 communicates with the outflow channel 7, and the orifice 11 is provided in the outflow channel 7.

The solenoid body 3 has a cylindrical solenoid 12
And a member 13 provided above the solenoid 12, a base 14 provided below the solenoid 12, and a core 15 fitted into the solenoid 12.

The valve body 4 comprises a plunger 16 and the plunger 1
The valve 17 includes a valve 17 fixed to a lower end thereof, and a leaf spring 18 which is an elastic body for urging the valve 17 to close. The valve 17 is provided with a seat packing 19.

As shown in FIG. 3, the leaf spring 18 is formed in a cross shape, and the center portion 18a of the leaf spring 18 is
And the valve 17 to be fixed.

The solenoid valve 1 is assembled by mounting the valve body 4 on the valve base 2 and attaching the solenoid 3 to the valve base 2. At the time of this assembly, the notch 18b of the leaf spring 18 is opposed to the inlets 8a and 8b of the valve chamber 6.

In the assembled state, the periphery 18c of the leaf spring 18 of the valve body 4 is fixed by being sandwiched between the valve body 2 and the solenoid body 3, the plunger 16 is located in the core 15, and the valve 17 is located in the valve chamber 6. It is located in. The seat packing 19 of the valve 17 abuts on the valve seat 10 by the leaf spring 18 and closes the outlet 9.

The solenoid valve 1 is provided in the flow path L of the cooling device as described in the prior art. When the inflow path 5 and the outflow path 7 of the solenoid valve 1 are connected to the flow path L and the solenoid 12 is energized, the plunger 16 is sucked until it hits the member 13, and the valve 17 is separated from the valve seat 10 against the leaf spring 18. The high-temperature and high-pressure cooling water in the inflow channel 5 is supplied to the low-pressure outflow channel 7.
Leaked to

As shown in FIG. 1, the cooling water flowing out of the low-pressure outflow passage 7 boils violently, but the outflow passage 17 is provided with the orifice 11, so that the valve seat 10 and the valve 1 are provided.
The portion 9 of the sheet packing 19 of 7 is kept at a high pressure and boils at the portion S of the orifice 11 to cause cavitation.

That is, in the illustrated embodiment, the portion S that causes cavitation is not the portion of the valve seat 10 and the seat packing 19 but the portion of the orifice 11. Therefore, the valve seat 10 and the seat packing 19 are not damaged, and the sealing performance of the valve 17 does not deteriorate.

The inflow passage 5 is branched into two lines 5a and 5b and connected to the two inlets 8a and 8b. The outlet 9 is opened in the middle of the inlets 8a and 8b. And the plunger 16 and the core 15 do not wear due to the inflow of the valve body 4 from the both sides in a well-balanced manner, and the smooth opening and closing of the valve body 4 is ensured for a long time.

Further, since the valve body 4 is biased to close by the leaf spring 18, the plunger 16 moves eccentrically without tilting and moves in a well-balanced manner.
Is not worn. And the cooling water inlets 8a, 8
Since the portion of the leaf spring 18 opposed to b is a cutout 18b, the vertical movement of the plunger 16 is not affected by the flow of the cooling water.

[0030]

The solenoid valve of the present invention has the following effects. (1) Since an orifice is provided in the outflow channel,
The portion of the valve seat and the seat packing is kept at a high pressure and does not cause cavitation, so that the valve seat and the seat packing are not damaged and the sealing performance is not deteriorated. (2) Since the inflow path is branched into two and connected to the two inlets, and the outlet is opened in the middle of the two inlets, the cooling water flows in from both sides of the valve in a well-balanced manner, and There is no inclination, the plunger and the core do not wear, and smooth opening and closing of the valve body can be ensured for a long time. (3) Since the valve is biased to close by a leaf spring,
The valve body is not eccentric and tilted, the plunger and the core are not worn due to the tilt of the valve body, and smooth opening and closing of the valve body can be ensured for a long time. (4) The portion of the plate spring facing the inlet of the cooling water is notched, so that the flow of the cooling water does not affect the vertical movement of the plunger.

[Brief description of the drawings]

FIG. 1 is a sectional view of a solenoid valve of the present invention.

FIG. 2 is a view taken in the direction of arrows AA in FIG. 1;

FIG. 3 is a plan view of a leaf spring.

FIG. 4 is a sectional view of the solenoid valve of the present invention in an open state.

FIG. 5 is a configuration diagram of a cooling device using an electromagnetic valve.

FIG. 6 is a sectional view of a conventional solenoid valve in an open state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Solenoid valve 2 ... Valve base 3 ... Solenoid body 4 ... Valve body 5 ... Inflow path 6 ... Valve chamber 7 ... Outflow path 8a, 8b ... Inlet 9 ··· Outlet 10 ··· Valve seat 11 ··· Orifice 12 ··· Solenoid 13 ··· Member 14 ··· Base member 15 ··· Core 16 ··· Plunger 17 ··· Valve 18 ··· Leaf spring 19: sheet packing

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3H066 AA01 BA03 BA12 EA12 3H106 DA07 DA13 DA23 DB02 DB12 DB23 DB32 DC02 DD03 EE20 EE30 EE36 GA24 GB01 KK33

Claims (3)

[Claims] 1. A valve base having an inflow passage communicating with an inlet of a valve chamber, an outlet of the valve chamber communicating with an outflow passage, a valve seat formed at the outlet and an orifice provided at the outflow passage, and a solenoid at an upper portion. Is provided, a base is provided below the solenoid, and a solenoid body in which a core is inserted in the solenoid, a plunger is slidably inserted in the core, and a valve fixed to the plunger is located in the valve chamber. An electromagnetic valve comprising a valve body provided with an elastic body for urging the valve toward a valve seat. 2. An inflow passage communicates with two inlets of a valve chamber, and an outlet opened between the two inlets communicates with an outflow passage, and a valve base having a valve seat formed at the outlet. A solenoid is provided at an upper portion, a base is provided at a lower portion of the solenoid, and a solenoid body having a core inserted into the solenoid and a plunger slidably inserted into the core and a valve fixed to the plunger are provided. An electromagnetic valve, comprising: a valve body provided in a valve chamber and provided with an elastic body for urging the valve toward a valve seat. 3. An elastic body for urging the valve to the valve seat side is constituted by a leaf spring, and a central portion of the leaf spring is fixed between the plunger and the valve, and a peripheral portion of the leaf spring is a valve. 3. The fixing device according to claim 2, wherein the fixing member is sandwiched between the base and the base of the solenoid body.
Solenoid valve.