JP2548156Y2 - Solenoid valve sleeve - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sleeve for a solenoid valve, and more particularly to a sleeve for a solenoid valve configured to stably fix a fixed iron core.

[0002]

2. Description of the Related Art For example, in a water pressure control unit for driving a control rod used in a nuclear power plant or the like, a cooling water supply for cooling a seal portion of a control rod driving mechanism is provided separately from a pipe for operating a scram. A pipe and a driving water supply pipe for supplying a predetermined amount of water for forcibly driving the control rod at the time of periodic inspection are provided.

[0003] A solenoid valve is provided in the driving water supply pipe, and is usually closed. On the other hand, the cooling water supply pipe is provided independently of the drive water supply pipe in a bypass manner, and a fixed orifice is provided on the way to supply a small amount of cooling water to the seal portion. It has become.

In such a solenoid valve, a fixed iron core and a movable iron core are inserted into a center hole of a solenoid formed of a coil. The fixed core is inserted and fixed in the inner part of the cylindrical sleeve, and the movable core is slidably inserted in the sleeve. When the solenoid is excited, it is attracted to a position where it comes into contact with the fixed core.

As shown in FIG. 5, a conventional sleeve for a solenoid valve used in the above-mentioned solenoid valve has a tapered end 1a of a fixed core 1.
Is rotated, the tip end portion 2a is caulked inward by the pressing of the roller 3. Then, the distal end portion 2a of the sleeve main body 2 and the end of the cap 4 are fixed by welding, and the end of the fixed core 1 is fixed to the sleeve main body 2.

[0006]

However, in the conventional sleeve for a solenoid valve, before the sleeve body 2 and the cap 4 are welded, the tip portion 2a of the sleeve body 2 is caulked to fix the fixed iron core 1 into the sleeve body 2. There is a problem that it needs to be fixed, the operation is troublesome, and it takes time.

Conventionally, the abutting portion a of the cap 4 is welded to the tip 2a of the sleeve main body 2, so that the fixed iron core 1 cannot be fixed to the sleeve main body 2, stress is easily applied to the welded portion, and strength is high. There is also a problem that is weak.

Therefore, an object of the present invention is to provide a solenoid valve sleeve that solves the above-mentioned problems.

[0009]

According to the present invention, there is provided a cap having an insertion hole into which one end of a fixed core is inserted, and a portion having a through hole, one end of the through hole protruding from the cap of the fixed core. A sleeve main body that is formed to extend so as to slidably guide the movable core, the other end of the through hole being coaxial with the fixed core, in a valve opening or valve closing direction. In a state where the end of the insertion hole of the cap and one end of the through hole of the sleeve main body are in contact with each other, the welding part is formed by integrally fixing both butted parts and the outer periphery of the fixed iron core.

[0010]

With the fixed core inserted into the insertion hole of the cap and the sleeve body, respectively, the butted portion of the cap and the sleeve body is welded to the outer periphery of the fixed core, so that the mechanical strength at the welded portion is reduced. It can be improved and caulking becomes unnecessary.

[0011]

1 to 3 show an electromagnetic valve to which an embodiment of a solenoid valve sleeve according to the present invention is applied.

In each figure, a solenoid valve 11 supplies driving water to a cylinder (not shown) of a control rod driving mechanism for driving a control rod in, for example, nuclear power generation, and supplies driving water for checking the movement of a piston. This is an electromagnetic switching valve provided in the middle of piping.

The solenoid valve 11 includes a valve body 12, a valve body 13 inserted into a sliding hole 12 a in the valve body 12, a solenoid assembly 14 mounted on an upper portion of the valve body 12,
It comprises a flow control valve 18. The valve body 12 has a sliding hole 12a.
A valve seat 12b, an inflow passage 12c communicating the bottom portion with the sliding hole 12a, and an outflow passage 12d communicating the bottom portion with the valve seat 12b are provided at the back.

Further, the valve body 12 is bolted to, for example, a bracket 16 (FIG. 1) of a water pressure control unit (not shown).
The driving water is supplied from the inflow passage 12c into the sliding hole 12a, and from the valve seat 12b to the driving water supply pipe (not shown) through the outflow passage 12d. leak.

The valve body 12 has an inflow passage 12c and an outflow passage 12
A bypass passage 17 that communicates with d is formed in the lateral direction. The bypass flow path 17 is provided with a flow rate adjusting valve 18 for adjusting a flow rate flowing through the bypass flow path 17. That is, a small-diameter orifice hole 17 a is provided on the inflow path 12 c side of the bypass flow path 17, and the tip 19 a of the valve shaft 19 is inserted into the outflow path 12 d side of the bypass flow path 17.

The valve shaft 19 extends from the screw portion 19b into the bypass passage 17 so as to cross the outflow passage 12d into the screw portion 19b screwed into a hole 36 formed in the side surface of the valve body 12. It has a rod 19c and an engaging portion 19d protruding from the side surface of the valve body 12.

Accordingly, the valve shaft 19 is moved in the X direction by rotating the engaging portion 19d with a tool, and changes the flow rate flowing through the bypass flow path 17. An O-ring 37 for sealing between the valve shaft 19 and the hole 40 is attached to the outer periphery of the end of the screw portion 19b.

The valve shaft 19 is fixed by tightening a lock nut 38 screwed into the screw portion 19b. Tip 1
9a is formed in a tapered shape, so that it is inserted into the orifice hole 17a of the bypass passage 17 and the valve shaft 1
By turning 9, the opening area of the orifice hole 17 a is adjusted, and the degree of restriction of the bypass passage 17 is changed.
Further, the rod 19c has a small diameter so as not to obstruct the flow in the outflow path 12d as much as possible.

As will be described later, when the valve 13 closes the valve seat 12b, a part of the driving water flows as cooling water through the gap between the orifice hole 17a of the bypass passage 17 and the tip 19a and the outflow passage 12d. And circulates through a drive water supply pipe (not shown).

As shown in FIG. 3, the valve body 13 has a seat member 13a at the bottom which comes into contact with the valve seat 12b, and a seat surface 13b at the top which comes into contact with the plunger (movable iron core) 22 of the solenoid assembly 14. . A first portion penetrating the center of the valve body 13 is provided at the bottom of the valve body 13 and the center of the seat surface 13b.
Pilot hole 13c is open, and the seat surface 13b
A second pilot hole 13 d is formed in the lower step portion and the side surface of the valve element 13. An O-ring 13e for sealing the gap between the valve body 13 and the sliding hole 12a is mounted on the outer periphery of the valve body 13.

The solenoid assembly 14 includes a solenoid 20 around which a coil is wound, and a cover 2 that covers the solenoid 20.
1, a plunger 22 slidably provided in the solenoid 20, and a cylindrical sleeve 23 screwed to the valve body 12 to guide the plunger 22. Sleeve 23
As shown in FIG. 4, the cap 23A and the sleeve body 23
B and butted together. Since the cap 23A and the sleeve main body 23B are formed of austenitic stainless steel, they have excellent corrosion resistance.

The cap 23A has an externally threaded portion 23A ₁ is screwed nut 23C to the upper end, a lower end fixed iron core 36
Insertion holes 23A ₂ of the upper end 36a is inserted is provided in the. Further, the insertion holes 23A at the upper end inner part of the ₂ small diameter hole 23
A ₃ is provided, the shaft 36b of the fixed iron core 36 is inserted into the hole 23A _3.

The butt portion b of the insertion hole edge 23A ₄ of the upper end 23B ₁ and the cap 23A of the sleeve body 23B is chamfered over the entire circumference so as to form a V-shaped groove is applied.

[0024] When secured to the fixed iron core 36 within the sleeve 23 first is inserted the upper end 36a of the fixed iron core 36 into the insertion hole 23A ₂ of the cap 23A, the shaft 36
b a is fitted into the hole 23A _2. Next, the sleeve body 2
3B of the guide hole by inserting the lower end portion 36c of the (through hole) 23B ₂ the fixed iron core 36, the upper end 23B ₁ Cap 23
Butting the insertion opening edge portion 23A ₄ of A.

[0025] The insertion hole end 23 the upper end 23B ₁ in this state
And A ₄ is welded from the outside, to weld the part b entire circumference butting. The welded portion 41 also functions as a seal portion by welding the butted portion B and the outer periphery of the fixed iron core 36, and the entire periphery of the sleeve 23 is welded without a gap.

In FIG. 4, the welded portion 41 is shown in a black triangular shape. In fact, the cap 23A and the sleeve main body 23B are not only melted by the high heat during welding but also located on the inner periphery thereof. The outer periphery of the fixed iron core 36 is also melted, and the welded portion is enlarged more than the groove shape. Thereby, the fixed iron core 36 is firmly fixed in the sleeve 23.

Therefore, even if stress is applied from the lateral direction perpendicular to the axial direction, since the fixed iron core 36 is fitted inside the welded portion 41, the stress may concentrate on the welded portion 41. In addition, it is possible to prevent the welding portion 41 from being cut. In addition, since it is not necessary to caulk the sleeve main body as in the prior art, the number of processing steps is reduced accordingly, and the working efficiency can be improved.

After the sleeve 23 welded as described above is polished for burrs at the welded portion 41, the
0 and is fixed to the solenoid 20 by tightening the nut 23C.

The plunger 22 is slidably inserted into the guide hole 23B ₂ of the sleeve 23 has a central hole 22a for fitting the coil spring 24 to the upper, against the seat surface 13b of the valve body 13 in the lower A sheet member (for example, made of rubber, synthetic resin, or the like) 25 that is in contact is embedded.

Reference numeral 26 denotes a coil spring provided between the valve body 13 and the plunger 22. The upper end of the coil spring 26 is locked by a constricted portion at the lower end of the plunger 22, and the lower end is locked by a locking groove of the valve body 13. I have. The lower end surface of the sleeve 23 is an O-ring 2
7 is compressed and an annular stopper 28 is
Is pressed and held by the step 12 e of the main body 12.

As shown in FIG. 2, the flow rate adjusting mechanism 30 for adjusting the flow rate of the outflow passage 12d is attached to the side surface of the main body 12, and reduces the flow passage area of the outflow passage 12d downstream of the valve seat 12b. To adjust the flow rate. That is, the flow rate adjusting mechanism 30 includes a throttle valve element 31 slidably inserted into a throttle hole 12f crossing the outflow passage 12d, a holder 32 into which the valve element 31 is screwed, a valve element 31 and a hole. An O-ring 33 seals the space between the O-ring 12 e and a lock nut 34 screwed into the threaded portion of the valve element 31, and a cap 35 screwed into the threaded portion of the holder 32.

Therefore, when adjusting the flow rate, the cap 3
After removing the lock nut 34 and loosening the lock nut 34, the end of the valve body 31 is turned with a tool such as a spanner.

Here, the switching operation of the solenoid valve 11 configured as described above will be described.

The solenoid valve 11 is normally closed, and is opened at the time of periodic inspection described later. However, since the seal member (not shown) of the piston of the control rod drive mechanism is heated, water as the cooling water flows from the inflow path 12c into the bypass flow path 17 and reaches the outflow path 12d, where the driving water is supplied. It is fed to a cylinder (not shown) of the control rod drive mechanism via a pipe (not shown). At this time, the flow rate of the supplied cooling water depends on the orifice hole 1 of the bypass passage 17 in the solenoid valve 11.
It is adjusted by the flow path area 7a.

As shown in FIG. 1, the seat member 1 of the valve body 13
When the valve 3a is in contact with the valve seat 12b to close the valve seat 12b, the pressure of the water supplied from the inflow passage 12c is increased via the second pilot hole 13d.
Acts on 9. Further, the plunger 22 is moved downward by the pressing force of the coil spring 24, and the seat member 25 is in contact with the seat surface 13 b above the valve body 13. Therefore, when the valve is closed, the valve body 13 is pressed by the valve seat 12b by the pressure of the water and the pressing force of the spring 24, and is held at the valve closing position.

Here, when performing a periodic inspection of the control rod drive mechanism, a drive current is supplied to the solenoid 20. That is, as shown in FIG. 3, when the solenoid 20 is energized, the plunger 22 is moved upward by its electromagnetic force. As a result, the seat member 25 of the plunger 22 is separated from the seat surface 13b, so that the pressure in the pilot chamber 29 is supplied to the outflow passage 12d through the first pilot hole 13c. Accordingly, the pressing force pressing the valve body 13 against the valve seat 12b is weakened, and the valve body 13 moves upward by the pressure of the driving water supplied from the inflow passage 12c and the tensile force of the spring 26. The valve body 13 moves up to a position where it comes into contact with the stopper 28 and separates from the valve seat 12b.

As a result, the sliding hole 12
The cooling water flowing into a flows out from the valve seat 12b to the outflow passage 12d.

The opening operation of the valve body 13 causes the inflow path 1
A part of the driving water from 2c is supplied to the bypass passage 17 as described above.
To the outflow channel 12d, most of which
The water is supplied from the outflow passage 12d to the driving water supply pipe through the outlet 2b. Therefore, a large amount of drive water is supplied to the cylinder of the control rod drive mechanism, and the piston operates.

The closing operation of the solenoid valve 11 is performed by cutting off the power supply to the solenoid 20. That is, when the solenoid 20 is demagnetized, the plunger 22 is moved downward by the pressing force of the spring 24, and the seat member 25 comes into contact with the seat surface 13b of the valve body 13. Therefore, the first pilot hole 13c of the valve body 13 is shut off. As a result, the pressure in the pilot chamber 29 above the valve body 13 rises through the second pilot hole 13d, and the valve body 13
And the pressing force of the springs 24 and 26 moves down in the sliding hole 12a to seat on the valve seat 12b. Therefore, the valve 13 returns to the valve closed state shown in FIG.

In the above embodiment, the solenoid valve having the structure shown in FIG. 1 has been described as an example. However, the present invention is not limited to this, and it is needless to say that the present invention can be applied to a sleeve of another type of solenoid valve.

[0041]

As described above, the solenoid valve sleeve according to the present invention has a fixed iron core having one end inserted into the insertion hole of the cap and the other end inserted into the through hole of the sleeve body.
Since the butted portion between the cap and the sleeve body can be welded to the outer periphery of the fixed iron core, the mechanical strength at the welded portion can be increased and the fixed iron core can be firmly fixed.

Therefore, even if a stress acts on the welded portion, the welded portion can be prevented from being cut, and the reliability after assembly can be improved. Further, since there is no need to caulk the sleeve main body as in the prior art, there are features such as a reduction in the number of processing steps and an increase in work efficiency.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an electromagnetic valve to which an embodiment of an electromagnetic valve sleeve according to the present invention is applied.

FIG. 2 is a partially cutaway cross-sectional view showing a flow rate adjusting mechanism of an outflow passage.

FIG. 3 is an enlarged vertical sectional view showing a valve body portion in an enlarged manner.

FIG. 4 is an enlarged vertical sectional view of a main part of the sleeve, which is a main part of the present invention.

FIG. 5 is a cross-sectional view illustrating a conventional solenoid valve sleeve.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Solenoid valve 12 Valve main body 13 Valve body 14 Solenoid assembly 17 Bypass flow path 18 Flow control valve 19 Valve shaft 20 Solenoid 21 Cover 22 Plunger 23 Sleeve 23A Cap 23B Sleeve main body 25 Seat member 29 Pilot chamber 30 Flow control mechanism 41 Welding part

Claims (1)

(57) [Scope of request for utility model registration] 1. A cap having an insertion hole into which one end of a fixed core is inserted, and a through hole, wherein one end of the through hole is fitted to a portion of the fixed core projecting from the cap, and the through hole is provided. The other end of the sleeve is formed to extend so as to slidably guide the movable iron core disposed coaxially with the fixed iron core in the valve opening or valve closing direction. A sleeve for an electromagnetic valve, comprising a welded portion formed by integrally fixing both butted portions and an outer periphery of the fixed iron core in a state where one end of a through hole with a sleeve body is abutted.