JPH0438134Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] Industrial field of application The present invention relates to a solenoid valve that opens and closes a valve port with a valve body connected to a plunger, and the plunger and the valve body share a sliding part. This invention relates to a pilot-type solenoid valve that is designed to reduce processing costs, to ensure smooth sliding of the valve body, and to make the solenoid valve body more compact.

Conventional technology Conventionally, when the coil of a pilot type solenoid valve is energized, the plunger is absorbed, the pilot port opens, and a pressure difference is generated between the valve chamber and the primary pressure chamber.
The structure is such that the valve body slides and the main valve port opens, but if the valve body does not slide smoothly, chattering, circling, severe vibration, noise, etc. will occur, and normal opening/closing control will not be possible. Not only is this not possible, but it also has the disadvantage of imparting irregular vibrations to the entire circuit, causing various failures.

As a countermeasure to this, the entire length of the valve body is extended to increase the sliding contact surface in the valve chamber, and a sliding contact ring made of resin or the like is inserted so that the sliding contact points are supported at two points to increase the distance between the supporting points. There are some products that prevent the inclination of the valve body and allow it to slide smoothly.
In this method, the entire length of the valve body itself must necessarily be extended, which has the disadvantage of increasing the size of the solenoid valve body.

In addition, the main valve body of the solenoid valve found in Japanese Utility Model Application Publication No. 57-132874 simply has its large diameter part slid into contact with the cylinder chamber of the valve box, and the guide shaft that protrudes above the main valve body is attached to the lid body. It is simply inserted directly into the guide part, and therefore the main valve body must displace its axis of movement with respect to the axis of movement of the plunger, and therefore the cylinder for movement of the main valve body must be displaced relative to the axis of movement of the plunger. This requires a machining process to provide a shaped guide part on the lid, and in order to allow the guide shaft to slide without any support, the cylindricity must be precisely machined, which increases the machining cost. Since the moving axis is displaced, assembly work is troublesome (the main valve body and plunger cannot be integrally connected), which is a drawback.

Problems that the invention aims to solve This invention aims to reduce processing costs by sharing the sliding parts between the plunger and the valve body, allows for smooth sliding of the valve body, and makes the solenoid valve body more compact. The purpose of the present invention is to provide a pilot type solenoid valve of the same type.

[Structure of the idea]

Means for Solving the Problems In view of the above points, the present invention is designed to reciprocate a valve port that communicates the primary pressure chamber and the secondary pressure chamber within an excitation coil, and to arrange the valve port coaxially with the valve port. In a pilot type solenoid valve that is opened and closed by a valve body having a pilot port connected to a plunger, the pilot type solenoid valve has a large diameter portion shaped like a piston, and
A communication notch for communicating the valve chamber and the pilot chamber is formed in the small diameter portion of the valve body, which has a small diameter portion protruding from the center of the large diameter portion toward the inside of the guide sleeve that is to slidably guide the plunger. A pilot type solenoid equipped with a pilot ring, a piston ring attached to the large diameter part, a small diameter part slidingly in contact with the inner peripheral wall of the guide sleeve, and a large diameter part slidingly contacting the inner peripheral wall of the valve chamber. It is an object of the present invention to provide a valve to overcome the above-mentioned drawbacks.

Function: In the present invention, the valve body is slidably supported by the sliding parts provided on the large diameter part and the small diameter part, thereby regulating the inclination of the valve body within the main body. This allows the valve body to slide smoothly.

Furthermore, since the flow path between the pilot chamber and the valve chamber is secured by the pilot ring, the sliding portion of the small diameter portion of the valve body can be provided within the pilot chamber.

Embodiment An embodiment of the present invention will be described below based on the drawings. Reference numeral 1 denotes a main body of a pilot type solenoid valve according to the present invention, and the main body 1 is composed of a valve box 2, a lid body 3, and a solenoid 4. ing.

The valve box 2 has a partition wall 9 that divides the primary pressure chamber 6 communicating with the inlet 5 and the secondary pressure chamber 8 communicating with the discharge port 7. A valve port 10 that communicates with the side pressure chamber 8 is provided through the valve port 10, and the upper part of the valve port 10 is connected to the valve seat 1.
1.

Reference numeral 12 denotes a valve body, and the valve body 12 has a pilot port 13 and has a piston-shaped large diameter portion 14 formed at its lower portion, and a recess 15 is carved in the lower surface of the large diameter portion 14. , the recess 1
Fit the valve disk 16 to the valve washer 1.
A groove 18 is formed on the outer periphery of the large diameter portion 14, and a piston ring 19 is fitted in the groove 18 to form a sliding portion 20. is vertically slidably inserted into the lid 3 attached to the upper part of the valve box 2 so as to come into sliding contact with the inner circumferential wall 22 of a cylindrical valve chamber 21.

On the other hand, a small diameter part 23 is formed to protrude upward from the central part of the large diameter part 14, and a wrapped part 24 is formed at the upper end of the small diameter part 23, and the wrapped part 24 is formed at an appropriate lower position. A pilot ring 27 is provided with a groove 25 carved on the outer periphery and communicating notches 26, 26a . . . formed in the groove 25 to form a sliding portion 28.

Further, an insertion opening 32 for assembling a plunger guide 31, which is coaxial with the valve port 10 and has a flange 29 and a guide sleeve 30 integrally formed, is formed in the upper part of the lid body 3. The plunger guide 31 is screwed into the assembly insertion opening 32 while the outer periphery of the pilot ring 27 is in sliding contact with the inner peripheral wall 33.

34 is a plunger, and the plunger 3
4 is formed in the shape of a piston, and has communication slits 35, 35a... formed therein, and a winding part 36 is formed on the lower outer periphery of the plunger 34. A pilot disk 37 is fitted inside the lower end, and a pilot disk 37 is inserted into the plunger 34 by a pilot spring 38. It is forcing downward pressure.

Further, the plunger 34 is loosely fitted into the guide sleeve 30 with an appropriate interval, so that it can freely slide.

In addition, 39 is a fixed iron core fitted to the upper end of the plunger guide 31, 40 is a lock spring that presses the plunger 34 downward, and 41 is a winding part 36 of the plunger 34 and a winding part 24 of the valve body 12. This is a connection spring that is wound around and connected to each other.

Further, the solenoid 4 is constituted by an excitation coil 42 disposed outside the plunger guide 31 and a cover body 43 surrounding the excitation coil 42.

44 connects the valve disk 16 of the valve body 12 to the valve port 10
This is a valve body spring that presses against the valve seat 11 of the valve body.

45 is a bleed port that allows the primary side pressure chamber 6 and the valve chamber 21 to communicate with each other.

Next, the operation of the pilot type solenoid valve according to the present invention will be explained. This restricts the inclination of the valve body 12 within the main body 1, so that the valve body 12 can slide smoothly.

Furthermore, since the flow path between the pilot chamber 46 and the valve chamber 21 is secured by the pilot ring 27, the sliding portion 28 of the small diameter portion 23 of the valve body 12 can be provided within the plunger guide 31. .

Next, the opening and closing operations of the pilot type solenoid valve will be explained. First, for the opening operation, when electricity is applied, the excitation coil 42 is excited, the plunger 34 is attracted, the pilot port 13 of the valve body 12 opens, and the valve is opened. Fluid in the chamber 21 and the pilot chamber 46 flows out from the pilot port 13 to the secondary pressure chamber 8, resulting in a pressure drop, and the pressure in the primary pressure chamber 6 pushes the valve body 12 upward, pushing the valve opening 10. is opened, and even when the differential pressure between the primary pressure chamber 6 and the secondary pressure chamber 8 is small, the valve port 10 can be opened by the action of the connection spring 41.

Next, for the closing operation, when the energization is released,
The plunger 34 is returned downward by its own weight and the stiff spring 40 to the pilot port 1 of the valve body 12.
3 is closed, the valve chamber 21 and the pilot chamber 46 are
The fluid in the primary pressure chamber 6 flows into the bleed port 45 communicating with the primary pressure chamber 6 of the valve box 2 and becomes at the same pressure as the primary pressure chamber 6, and then the fluid in the primary pressure chamber 6 flows into the valve body 12.
A force is applied to push down, and the tight spring 4
The valve port 10 can be closed by the return action of 0.

[Effect of idea]

In short, the present invention connects the excitation coil 4 to the valve port 10 that communicates the primary pressure chamber 6 and the secondary pressure chamber 8.
A pilot type electromagnetic valve is a pilot type solenoid valve that is opened and closed by a valve body 12 that reciprocates within a valve body 2 and has a pilot port 13 that is connected to a plunger 34 disposed coaxially with the valve port 10. The small diameter portion 23 of the valve body 12 has a diameter portion 14 formed therein, and a small diameter portion 23 protruding toward the inside of the guide sleeve 30 which is to slidably guide the plunger 34 in the center of the large diameter portion 14. Communication notches 26, 26 that communicate the valve chamber 21 and the pilot chamber 46
At the same time, the pilot ring 27 formed with a... is attached, the piston ring 19 is attached to the large diameter portion 14, the small diameter portion 23 is slid into contact with the inner circumferential wall of the guide sleeve 30, and the large diameter portion 14 is attached to the inner circumferential wall of the valve chamber 21. Since the small diameter portion 23 of the valve body 12 is arranged in a sliding contact state, it is possible to freely dispose the small diameter portion 23 of the valve body 12 within the guide sleeve 30 which is to slidingly guide the plunger 34 provided coaxially with the valve port 10. This reduces processing costs by sharing the sliding part (guide sleeve 30) between the plunger 34 and the small diameter portion 23 of the valve body 12.
The inclination of the valve body 12 within the main body 1 is restricted by slidingly supporting the valve body 1, reducing sliding resistance, allowing the valve body 12 to slide smoothly, and generating vibration and noise due to chattering, circumferential contact, etc. The plunger 34
The plunger 34 is made compact.
The sliding surface between the plunger 34 and the valve body 12 is made smaller, and the machining accuracy of the cylindrical degree of the guide sleeve 30 itself is moderated, which together with the cost reduction due to the above-mentioned common use, further reduces the machining cost.
Its practical effects are enormous, such as making it possible to integrally connect it with the other parts and simplifying the assembly work.

[Brief explanation of the drawing]

The figure shows one embodiment of the present invention.
The figure is a longitudinal sectional view of a pilot type solenoid valve according to the present invention, FIG. 2 is a plan view of the same pilot ring, and FIG. 3 is a longitudinal sectional view of a conventional pilot type solenoid valve. 6...Primary side pressure chamber, 8...Secondary side pressure chamber, 1
0... Valve port, 12... Valve body, 13... Pilot port, 14... Large diameter section, 21... Valve chamber, 22...
...Inner peripheral wall, 23...Small diameter part, 24...Wrap part, 2
6, 26a...Communication notch, 28...Sliding part, 31
... Plunger guide, 34 ... Plunger, 36 ... Winding section, 42 ... Excitation coil, 46
...Pilot room.

Claims (1)

[Scope of utility model registration request] A valve body that has a pilot port that reciprocates the valve port that communicates the primary pressure chamber and the secondary pressure chamber within the excitation coil and is connected to a plunger that is disposed coaxially with the valve port. In a pilot-type solenoid valve that opens and closes with a piston, a large-diameter portion is formed in the shape of a piston, and a small-diameter portion is formed in the center of the large-diameter portion to protrude toward the inside of a guide sleeve that is to slidably guide a plunger. A pilot ring with a communication notch that communicates the valve chamber and the pilot chamber is attached to the small diameter part of the valve body, and a piston ring is attached to the large diameter part, and the small diameter part is in sliding contact with the inner circumferential wall of the guide sleeve. A pilot type solenoid valve characterized in that the diameter portion is placed in sliding contact with the inner circumferential wall of a valve chamber.