JPS63254287A - Solenoid 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] (Industrial application field) This invention relates to a solenoid valve.

(Prior Art and Problems to be Solved by the Invention) A type of valve that is energized by energizing a field coil to move the closing member away from the seat or into pressure contact with the seat is called a solenoid valve. 3. This type of valve has a valve housing with two diametrically opposite holes, which holes are provided with internal threads for connection to, for example, pipes. This hole is provided with further holes perpendicularly to it, at least one of which is located in the center of the housing and cooperates with the closing member to provide a tight, t=J effect. The closing member itself is fixed to the end of a bar-shaped armature made of ferromagnetic material, and the armature protrudes into the inside of the cylindrical field coil, and the inside of the In such a solenoid valve, the magnetic force generated by the excitation of the coil can keep the closing member stationary against the force of the spring, and the two controllable field coils can be moved. It is also possible to use the magnetic force of the blue field coil to open and close the solenoid valve by installing it.In this case, the main part of the entire length of the rod-shaped armature is guided inside the field coil, and the solenoid valve The "operability" of this guide depends on the quality of this guide.

German Union Minister Ill Publication No. 3429913 discloses a solenoid valve for a blood pressure monitor. In the solenoid valve disclosed in the same publication, a coil is placed inside a hollow cylindrical electromagnetic block, and the hollow cylindrical magnetic core of the coil is located on the right side of the inlet and outlet, and in front of the outlet is a magnetic star-shaped dianorum. UI L/, a gasket is installed on the side opposite to the outlet of this dyno 7 noram. Although there may be no problem with this structure in the above-mentioned applications, this type of solenoid valve cannot be used in vacuum equipment, especially high vacuum equipment. Since the housing is not airtight and the entire field coil including the lead-in wire is directly exposed to the medium, the windings of the coil and its insulating coating generate gas within the medium, which obstructs the vacuum.

Deutsche Bundestag 1B Republic Publication No. 3227613 describes a solenoid valve having a movable armature for actuating the valve and a magnetic device for moving the valve. A non-magnetic material is provided in a part of the armature to provide a 1 fl air gap between the magnetic device and the armature. The housing that surrounds these first members of the valve fl is formed from a number of members including plate-shaped flared parts, and furthermore, packings and gaskets 1 to 1 are installed between each part. There is a gap or air gap between the end faces of the field coil and the armature, the height of which corresponds to approximately half the height of the coil itself, and which contains a controlled return of the energized magnetic field. There are no ferromagnetic materials available. In the case of the split housing shown in the same publication, unless the valve is used exclusively in a vacuum, an external force acts on the pipe line section and a bending load is applied to the valve housing. Only a relatively small sealing pressure can be applied to the

The solenoid valve shown in U.S. Pat.
Although it has a ferromagnetic casing for controlled guidance of the Li field, it is unsuitable for use in high vacuum because the end face of the coil is located directly inside the valve chamber. Again, the winding insulation releases gas into the vacuum. This obstructs the vacuum. Furthermore, it is hardly possible to vacuum-tightly seal the threaded connection between the housing part 5 on one side and the housing part 20 on the other side of the solenoid valve known here.

Also in the case of the solenoid valve of DE 22 46 624 A1, the winding of the field coil is not isolated from the valve chamber, and cannot be isolated. For this reason, this solenoid valve also cannot be used for vacuum equipment applications.

(Objective of the Invention) The present invention is directed to a closing member that moves with as little friction as possible, and is formed to be as airtight as possible, that is, so that there are no parts that need to be sealed from the outside. The object of the present invention is to provide a solenoid valve in which the closing member is mounted in such a way that it can be used as a safety valve so that inadvertent foreign objects carried in by a medium flowing through the solenoid valve will not interfere with the operation and operability of the closing member. It is said that

(Structure and operation of the invention) The solenoid valve of the present invention has a housing, at least one seat located within the housing, and a closing member that can be pressed against the seat, the closing member being held by a magnetizable armature, It is also equipped with a field coil that can be connected to a power source in order to slide the armature. provided on one end face, the closing member being arranged in the center of a disc-shaped, monograph-shaped or cross-shaped armature, the enlarged part of the armature being located at right angles to the axis of the conduit section with the seat. The axis of the field coil is parallel to the axis of the conduit section, the peripheral surface of the armature is loosely fitted and held by the housing, and a spring is provided between the conduit section having the seat and the armature. ,
One end of the spring is connected to the conduit section and the other end is connected to the armature, and the inner surface of the housing facing the conduit section having the seat is close to the peripheral edge protruding into the housing toward the groove 1a. the housing is formed of a plurality of parts, and the housing is formed of a plurality of parts; The field coil is located in a ferromagnetic casing with one end open, and the casing has an annular shape. A pipe section having a sheet is inserted into the center hole of the casing. A casing is screwed onto the conduit section, and the housing is
It is formed by two conduit sections, and the D of these conduit sections is
each having an umbrella-shaped or flange-shaped enlargement on the end face having opposite openings, at least one of these enlargements having a peripheral edge located towards the other enlargement; The casing is welded to each other along the outer edge of the casing, and the open end of the casing has seven flange portions extending outward, and a male threaded portion is installed in the seven flange portions.
A union nut, which is somewhat larger in diameter than the housing, is screwed onto this male threaded portion to hold the housing.

The solenoid valve of the present invention was developed for use in gas centrifugal separators related to uranium compression equipment, and is used as a safety valve. Such a centrifugal separator is connected to three lines, one line for the gas mixture to be separated and the other two lines for the gases separated.

Such centrifuges operate in series in a vacuum, so that normally used devices of this type are equipped with several thousand centrifuges. The rotating body of the centrifugal separator rotates at high speed (approximately 40,000 revolutions per minute), has a diameter of approximately i11 om, and a height of approximately 3,800 m. If one centrifuge in a chain of thousands of centrifuges fails,
Experts agree that this creates a pressure wave inside the centrifuge, and if proper safety measures are not taken against the propagation of this h-force wave, the pressure wave will propagate rapidly and cause a domino effect. All other centrifuges are destroyed. The solenoid valve of the present invention is effective as a safety device in its protective function. To deal with such extremely difficult problems, it is necessary to configure the solenoid valve with specifications not found in known structures.The valve housing must be vacuum resistant, so seams and split parts should be avoided as much as possible. In addition, the field coil is isolated from the flow path, has a fast closing speed (less than 25 Ills), and is extremely small in order to keep the time constant that governs response time small. On the other hand, it is necessary to obtain a large closing force with such a small coil 1, and a small air gap must be provided between the coil and the armature to prevent gas from being released in the event of a failure.

The solenoid valve according to the present invention satisfies the above requirements and can be used as a safety valve for a centrifugal separator for a uranium compression device. In other words,
Such coils are isolated from the flow path and are compact, have controllable magnetic flux, and can be vibrated by the corner nut 1-, despite the relatively thin housing bulkhead located between the armature and the coil. A stable structure capable of absorbing impact bending loads without affecting magnetic properties is required.

(Example) Next, an example of the present invention will be described with reference to the drawings for correction.

In the figure, one end of the first conduit section 1 is provided with a pipe fitting 2, a flange joint, or a threaded joint to connect to the pipe 1, and an inner end of the first conduit section 1 having a seat 3. The portion is formed into a relatively thick umbrella-shaped or flange-shaped enlarged portion 4 on the right side of the peripheral edge portion 5. A stepped portion 6 is provided at the inner opening of the first conduit portion 1 at the seat 3. A male threaded portion 7 is provided on the outer peripheral surface of the first conduit portion 1 over a part of its entire length. It is installed and the male thread part 7
The first conduit section 1 including the first conduit section 1 is made of a non-magnetic material such as aluminum.

A disk-shaped armature 8 is arranged parallel to the plane of the enlarged portion 4, and the main plane of this armature 8 forms a hundred angle with respect to the plane of the drawing in which FIG. 1 is depicted. A recess is formed in the center of the disc-shaped armature 18, into which a closing member 9 with a central shaft 10 is mounted. This closure member 9 is constructed of a suitable material to function effectively as a closure device and to have properties suitable for the type of medium flowing through the valve. The outer diameter of the armature 8 is set smaller than the inner diameter of the cylindrical space 11 surrounded by the peripheral edge 5, so that the entire circumferential surface of the armature 8 is
The inside of the octopus is more open.

In the illustrated state, the armature 178 is supported by the conical coil spring 12. One end surface of the winding portion of the coil spring 12 is pressed or fitted to the stepped portion 6, and the other end surface grips the central shaft 10 of the closing member 9 by pressure and/or fitting. The tapered portion 12 is located opposite the closure member 9. A plurality of through holes 13 are provided in the armature 8 at positions surrounding the closing member 9. The total cross-sectional area of the through holes 13 of the armature 8 is set to be at least equal to the internal cross-sectional area of the first conduit section 1.

In the embodiment shown in FIG.
The pipe section 14 is arranged in a straight line, and the second pipe section 1
A connecting mechanism for connecting to piping is provided at the outer end of C. An enlarged portion 15 is provided at the end of the second conduit portion 14 facing the armature 8, and this enlarged portion 15
The contour around 1 is set to be the same as the enlarged part 4.
, the enlarged portion 15 also has a peripheral edge 16 , and this peripheral edge 1
6 forms a housing in contact with the peripheral edge 5.

These peripheral portions are closely attached by welding 17 on the peripheral portions. An annular protrusion 18 is formed in the enlarged portion 15 and extends toward the armature 8 from the inner side close to the peripheral edge 16 thereof. The end surface of the armature 8 , which is biased by the coil spring 12 , is in contact with the protrusion 18 , and the through hole 13 of the armature 8 is arranged inside the annular ring of the protrusion 18 .

The field coil 19 is housed in a casing 20 made of a ferromagnetic material with one end open, and the end is led outside and connected to a power source (not shown). .

The casing 20 has an annular cross-sectional shape, and has a flange 21 on the open end thereof, which engages a male thread 22.
is provided. The diameter of this flange 21 is the enlarged portion 4
It is set to be somewhat larger than the diameter of 1 to 15. The end of the casing 20 on the open bx side is in contact with the outer surface of the enlarged portion 4, and the first conduit portion 1 passes through the casing 20 in the axial direction.

Moreover, the gauging 20 has a moving threaded portion for fixation that is screwed into a corresponding threaded portion of the first conduit portion 1 .

The axis of the field coil 19 is parallel to the axis of the first conduit section 1.

The union nut 1-23 is attached to the screw 22 of the casing 20.
is screwed onto a3, and a housing 81i formed by the enlarged portions 4 and 15 is locked to this conical putty 1 by means of 23 (see Fig. 1). In terms of structure, the armature 8 can be formed as an annular plate, or can also be formed in the shape of a cross or a single letter. Also, in place of the field coil 19, a plurality of cylindrical field coils are used, the axes of which are parallel to the U.
15 = It is also possible to provide it around the first conduit section 1 as shown in FIG. Furthermore, a field coil of the same type as above is installed inside the ship in the second pipe section 14, so that both coils are exclusively connected to each other.
It is also possible to connect the coil spring 12 so that it is energized, and by installing the second field coil in this way, the action of the coil spring 12 can be strengthened. It is effective to make it as thin as possible.

The action and effect of the solenoid valve shown in Figures 1 and 2 are B4.
"Building" is directly explained. That is, when the coil 19 is not energized, that is, is not excited, the ilpon 12 releases the armage 178 inside the valve chamber 11, and at the same time, a gap opened and opened by the protrusion 18 is created. When one of the solenoid valves is energized, the armature 8 is drawn toward the casing 20 against the coil spring 12 by the magnetic field generated by the energization, and the closing member 9 is brought into close contact with the seat 3 to close the solenoid valve. The axial dimensions and degree of extension of each of the closing member 9 and the seat 3 are such that the end of the closing member 9 comes into close contact with the seat 1 and the seat 3 before the end surface of the armature 8 comes into contact with the enlarged portion 4. At the same time as the excitation of the coil 19 is stopped F, the magnetic field disappears, the coil spring 12 moves the rear armature 1a 8 to the position shown in FIG. 1, and the solenoid valve returns to its original open state. As is clear from the above description and drawings, the housing has a welded portion 1.
With the exception of point 7, there are no locations that need to be sealed from the outside, and the welding of these welds can be made robust and airtight using today's welding techniques. The armature 8 is practically floating inside the valve chamber 11, and there are no sliding contact points with other (M-shaped parts) that impede its movement.Also, the structure is simplified and the performance is improved. For example, a small leaf spring can be used in place of the conical-walled coil spring 12 shown in the figure.The solenoid valve shown in FIG. 1 is of a straight type.

Next, a solenoid valve according to a second embodiment of the present invention will be described with reference to FIG.

The solenoid valve shown in the figure is a dual-path valve, and its internal structure is the same as that of the solenoid valve of the above embodiment, and similar parts are given the same reference numerals. The armature 8 is formed by an annular plate, and the closing member 9 has closing surfaces on both sides of the armature 8. For this purpose, the armature 8 has a central through hole with a step, into which a closing member made of a material suitable for the application is fitted.

The solenoid valve of this example includes a central hole 25 and a passage 26 parallel to the central hole 25 instead of the second conduit member 171 having the enlarged portion 15 at the end described in connection with the first example, A housing part 24 is provided with pipe fittings 27 and 28 on the outside. A peripheral portion of the housing portion 24 facing the first conduit portion or the armature 8 has an inner peripheral shape corresponding to the enlarged portion 15. In the state shown in FIG. 3, the flow path from the first pipe section 1 to the flow path 26 is in an open state. From this state, when the coil 19 is energized, the armature 8 is attracted and a flow path from the passage 26 to the central hole 25 or vice versa is formed, while the flow path to the first conduit section 1 is closed.

Such a solenoid valve is suitable because the armature 178 with the closing member 9 is supported in a floating manner, so that free movement due to magnetization and spring action is ensured in all situations of use and in all applications. Suitable as an excellent safety valve essential for emergency stop devices.

The gap between the armature 8 and the enlarged part 4 is set small so that the magnetic attraction force acts as effectively as possible, and the wall thickness of the enlarged part 4 is also formed to be extremely thin, for example, 1 mm or less. By having a relatively thin wall thickness, such as 1M or less, the bending strength and tensile strength of the housing containing the closure member and the armature 8 are not significantly affected. In other words, although the housing has the function of closing the solenoid valve from the outside, any tension or bending force acting on the solenoid valve from the outside is absorbed by the casing 20 and the union nut 23, which are mechanically stable structural elements. The type of force is always stopped by these and the influence on the housing is reduced by υF, so the housing maintains its original shape even with thin walls or under adverse conditions, and maintains the exact dimensions determined by the purpose. This allows the body to perform its normal functions reliably.

[Brief explanation of the drawing]

The figures show embodiments of the present invention; FIG. 1 is a vertical sectional view of a solenoid valve according to the first embodiment, and FIG.
A sectional view taken along the line, FIG. 3 shows the second embodiment.
FIG. 3 is a vertical cross-sectional view of the liti valve. 1... First conduit section 3... Seat 4.15... Enlarged section 5.16... Peripheral section 7... Threaded section 8... Armature 9... Closing member 12. ...Spring 14...Second conduit section 18...Protrusion 19...Field vA+Ile 20...Casing 21...Flange 22...Threaded portion 23...Union nut

Claims (4)

[Claims] (1) It has a housing, at least one seat located in the housing, and a closing member 9 that can be pressed against the seat, and the closing member 9 is held by a magnetizable armature 8 and allows the armature 8 to slide. The sheet 3 is provided on one end surface of the pipe section 1, which has a pipe joint, threaded joint, flange joint, etc. for pipe connection at the other end. The closing member 9 is arranged in the center of a disc-shaped, monograph-shaped or cross-shaped armature 8, the enlarged part of which is located at right angles to the axis of the conduit section 1 with the seat 3. , the axis of the field coil 19 is parallel to the axis of the conduit section 1, the peripheral surface of the armature 8 is loosely fitted and held by the housing, and between the conduit section 1 having the seat 3 and the armature 8. has a spring 12, one end of the spring 12 is connected to the conduit section 1, and the other end is connected to the armature 8,
The inner surface of the housing facing the conduit section 1 having the seat 3 has a protrusion 18 in a region close to the peripheral edge protruding into the housing toward the armature 8, and a field coil 19 is attached to the protrusion. When de-energized, the armature 8 biased by the spring 12 is in pressure contact with the housing, and the housing is formed of a plurality of parts, the dividing plane of which is parallel or The field coil 19 is located in a ferromagnetic casing 20 that is open at one end, and the casing 20 has an annular cross-sectional shape and has a hole in its center. A pipe section 1 having a sheet 3 is inserted through the casing 20, and a hole in the center of the casing 20 has a threaded part over at least a part of its entire length, and the casing 20 is connected to the pipe part 1 through the threaded part. are screwed together, and the housing is connected to the two conduit sections 1.
, 14, and these pipe sections 1, 14
a peripheral edge 5, each having umbrella-shaped or flange-shaped enlargements 4, 15 on the end faces with mutually opposite openings, at least one of these enlargements 4, 15 being located towards the other enlargement; 16, and are joined to each other by welding 17 along the outer edges of the peripheral edges 5 and 16, and the open end of the casing 20 has a flange portion 21 extending outward. 21 is provided with a male thread 22, and a union nut 23, which is somewhat larger than the diameter of the housing, is screwed onto the male thread 22 to hold the housing. (2) The electromagnetic valve according to claim 1, wherein the enlarged portion 4 that contacts the open end surface of the casing 20 holding the field coil 19 from the outside is thinner than the wall thickness of the other enlarged portion 15. . (3) The electromagnetic valve according to claim 1 or 2, wherein the conduit sections 1, 14 and the housing are made of a non-magnetic material such as aluminum. (4) The electromagnetic valve according to claim 1, wherein the coil spring 12 is formed into a conical shape, and a tapered end face thereof faces the closing member 9 and is connected to the closing member 9.