JPH06221461A - Three way solenoid valve - Google Patents

Abstract

PURPOSE:To improve the dynamic characteristic of a movable core by composing the movable core of a small diameter part going upward from the upper end face of a large diameter cylinder part, a retainer inserted into the outer periphery of the small diameter part, the third valve part arranged on the lower end face of the large diameter cylinder part, and the second valve part arranged on the upper end of the small diameter cylinder part. CONSTITUTION:When an electromagnetic coil is turned on, the upper end face 6A of a large diameter cylinder part 6 is attracted to the lower end 2E of a fixed core part 2D, and a movable core 5 moves upward against the spring force of a spring 9, and the second valve part 6D blocks up the second valve seat 2F, and on the other hand, the third valve part 6F opens the third valve seat 4B. Thus fluid flowing from the first flow path 4D into the second space D flows out from the third flow path 4C through the third valve seat 4B, and on the other hand, the flowing out of the fluid from the second flow path 2G is checked. A retainer 7 made of nonmagnetic material is insertedly arranged on the outer periphery of the small diameter cylinder part 6B of the movable core 5 to prevent adsorption between the outer periphery of the small diameter cylinder part 6B and the inner periphery of the fixed core part 2D for improving the dynamic characteristic of the movable core 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a three-way solenoid valve which switches a flow passage between a first communication state and a second communication state by a valve portion provided on a movable core driven by an electromagnetic device.

[0002]

2. Description of the Related Art A conventional three-way solenoid valve is disclosed, for example, in Japanese Patent Laid-Open No.
No. 157576. According to the specification, the core 21 is attached to the upper end of the annular sleeve 26 formed of a non-magnetic material, and the sleeve 2
A yoke 32 is attached to the lower end of 6, and the sleeve 26
Plunger 23 is movably arranged inside so as to face the lower end surface of core 21. Then, the upper and lower ends of the sleeve 26 are attached to the core 21 and the yoke 32 by press fitting. Further, in the assembling work of the three-way valve including the electromagnetic device, a thin case end edge portion is fixed to the peripheral edge of the flange 21d of the core 21 by caulking 33a. Further, the valve portion 40 has discharge ports 45 formed on four sides of the outer base 42, and the inner end edge thereof is caulked 42f. Further, with the outer base 42 in contact with the yoke 32, the end edge of the thin-walled case 33 at the tip is attached to the outer base 42.
It is fixed to the notch 42h by the caulking 33b.

[0003]

According to such a conventional three-way solenoid valve, the sleeve 26, the core 21 and the yoke 32 must be fitted very carefully and carefully. That is, when the yoke 32 and the sleeve 26 are fitted, if the inner diameter of the sleeve 26 decreases, the plunger 23
A proper gap cannot be formed with the outer diameter of the plunger 23, and the operation of the plunger 23 lacks smoothness. Further, the upper portion of the sleeve 26 fitted to the core 21 and the yoke 32.
Even when the concentricity between the upper part and the lower part of the sleeve 26 fitted to the above is not accurately maintained, the same problem as described above occurs in the operation of the plunger 23.

Further, according to the crimping 33a, 33b, 42f which is performed three times during the assembling work of the three-way solenoid valve, the number of work steps increases and the manufacturing cost increases, which is not preferable.

The three-way solenoid valve according to the present invention has been made in view of the above problems. The movable core has good operability and the number of parts is
It is an object of the present invention to provide a three-way solenoid valve that requires a small number of assembly work steps and is inexpensive to manufacture.

[0006]

In order to achieve the above object, a three-way solenoid valve according to the present invention comprises a first flow passage, a second flow passage and a third flow passage, and is operated by an electromagnetic device. In a three-way solenoid valve in which the flow path is switched by a movable core, a main body housing made of a magnetic material is provided in a tubular housing portion, which opens downward at the lower end from the outer periphery of the bottom portion, and inward of the tubular housing portion. And an annular fixed core portion that extends downward from the bottom portion, and a second flow path that faces the center of the bottom portion inside the inner periphery of the annular fixed core portion and that opens to the bottom portion through the second valve seat. The valve body housing made of a magnetic material is provided with a collar portion that closes the opening at the lower end of the tubular housing portion, an annular tubular portion that extends upward from the collar portion, and a collar portion inside the annular tubular portion. Third opening in the center through the third valve seat
The flow path and the collar portion within the inner circumference of the annular tubular portion, and
A movable core made of a magnetic material, which is composed of a first flow path that is open to a flange portion that is lateral to the flow path, and a large-diameter tubular portion, and a small-diameter tubular portion that extends upward from an upper end surface of the large-diameter tubular portion, An annular retainer made of a non-magnetic material, which is inserted in the axial direction of the outer circumference of the small-diameter tubular portion, a third valve portion arranged on the lower end surface of the large-diameter tubular portion to open and close the third valve seat, and an upper end of the small-diameter tubular portion. And a second valve portion that opens and closes the second valve seat, and an electromagnetic coil is disposed at the bottom of the tubular housing portion, and the opening at the lower end of the tubular housing portion is provided by the flange portion of the valve body housing. When closed, a first space is formed on the inner circumference of the fixed core portion, and a second space is formed by the lower end of the fixed core portion and the inner circumference of at least the annular tubular portion. , The third valve portion may face the third valve seat, and the upper end surface may face the lower end of the fixed core portion. The large-diameter cylindrical portion of the core is movably arranged, and the second valve portion faces the second valve seat in the first space, and the spring urges the second valve portion away from the second valve seat. A small diameter cylindrical portion including the retained retainer is movably arranged, and a fixed diameter core portion or the small diameter cylindrical portion including the retainer is formed with a first communication passage that connects the first space and the second space to each other. The cylindrical portion is formed with a second communication passage that connects the upper end surface and the lower end surface of the large-diameter cylindrical portion.

[0007]

According to the three-way solenoid valve of the present invention, the conventional sleeve can be replaced with a retainer inserted in the outer circumference of the small-diameter cylindrical portion of the movable core, and the retainer is slidably held on the inner circumference of the fixed core portion. Therefore, the operability of the movable core can be favorably maintained. Also, in the assembling work, after the electromagnetic coil and the movable core are arranged in the cylindrical housing, only caulking for closing the opening at the lower end of the cylindrical housing with the flange of the valve body housing is necessary. The work man-hours can be greatly reduced.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the three-way solenoid valve according to the present invention will be described below with reference to the drawings. A main body housing 1 made of a magnetic material will be described with reference to FIG. Reference numeral 2 denotes a tubular housing portion having a bottomed tubular shape, which extends downward from the outer periphery of the bottom portion 2A located above, and whose lower end 2B opens through the locking step portion 2C, and is located inside the tubular housing portion 2. An annular fixed core portion 2D projects downward from the bottom portion 2A. The lower end 2E of the fixed core portion 2D does not reach the height of the locking step portion 2C. In addition, a second flow passage 2G opens at the center of the bottom portion 2A and at the inner bottom portion 2A of the fixed core portion 2D through the second valve seat 2F. Furthermore, a first communication passage 2J is formed in the inner circumference 2H of the fixed core portion 2D so as to reach from the bottom portion 2A to the lower end 2E of the fixed core portion 2D.

The valve housing 3 made of a magnetic material will be described with reference to FIG. 4 is a cylindrical housing part 2
Is a collar portion arranged on the locking step portion 2C, and an annular tubular portion 4A projects upward from the collar portion 4. Then, at the center of the collar portion 4 and on the inside of the tubular portion 4A, the collar portion 4 has a third
The third flow path 4C opens through the valve seat 4B, and the tubular portion 4
A first flow path 4D is opened in the flange 4 on the inner side of A and on the side of the flange 4 on the side of the opening of the third flow path 4C.

The movable core 5 made of a magnetic material will be described with reference to FIG. Reference numeral 6 denotes a large-diameter cylindrical portion having a large diameter, and a small-diameter cylindrical portion 6B having a small diameter projects upward from an upper end surface 6A of the large-diameter cylindrical portion 6. Upper end 6C of small-diameter tubular portion 6B
The second valve portion 6D is disposed in the lower end surface 6E of the large-diameter tubular portion 6.
The third valve portion 6F is arranged at. Further, 7 is an annular retainer made of a non-magnetic material, which is arranged along the axial direction of the movable core 5 by being inserted into the outer circumference 6G of the small diameter cylindrical portion 6B.
It does not need to be press-fitted and fitted. In this example, it is on the upper end surface 6A of the large-diameter cylindrical portion 6 and is inserted into the outer circumference 6G of the small-diameter cylindrical portion 6B. In addition, the large-diameter cylindrical portion 6 is provided with a second communication passage 6H that reaches the lower end surface 6E from the upper end surface 6A.

The three-way solenoid valve is assembled as follows. The electromagnetic coil 8 is inserted and arranged from the opening of the lower end 2B of the tubular housing portion 2 of the main body housing 1 toward the bottom portion 2A. At this time, the electromagnetic coil 8 is placed between the fixed core portion 2D and the tubular housing portion 2. It Next, the small-diameter cylindrical portion 6B of the movable core 5 is inserted toward the bottom 2A through the opening of the lower end 2B of the cylindrical housing portion 2. According to the above, the small-diameter cylindrical portion 6B of the movable core 5 is arranged on the outer circumference 6G. The retainer 7 and the small-diameter cylindrical portion 6B that are formed are the inner circumference 2 of the fixed core portion 2D.
The second valve portion 6D is movably arranged in a first space C formed by H and the bottom portion 2A, and the second valve portion 6D is in the first space C.
It is arranged so as to face the second valve seat 2F which is open to. Incidentally, 9
Is a spring contracted between the bottom portion 2A and the upper end of the retainer 7, and the movable core 5 including the retainer 7 is pressed downward in the drawing. Next, the collar portion 4 of the valve body housing 3 is arranged on the locking step portion 2C of the tubular housing portion 2. According to this, the lower end 2E of the fixed core portion 2D and at least the annular tubular portion 4A A second space D is formed by the circumference 4E, the large-diameter cylindrical portion 6 of the movable core 5 is movably arranged in the second space D, and the third valve portion 6F is opened in the second space D. It is arranged so as to face the third valve seat 4B. The outside of the upper end surface 6A of the large-diameter cylindrical portion 6 faces the lower end 2E of the fixed core portion 2D. In this state, the lower end 2B of the tubular housing portion 2 is swaged inward toward the outer periphery of the collar portion 4, and the assembling of the three-way solenoid valve is completed.

Next, the operation will be described. Explaining the state where no current is supplied to the electromagnetic coil 8, the movable core 5 is biased downward by the spring force of the spring 9, the third valve portion 6F closes the third valve seat 4B, and the second valve portion 6 is closed.
D opens the second valve seat 2F. According to this, the fluid flowing from the first flow passage 4D flows into the second space D, and the fluid flows from the second communication passage 6H, the upper portion of the second space D, the first communication passage 2J to the first space C. Second valve seat 2F after flowing into the upper part of
Through the second flow path 2G. On the other hand, the second space D
As described above, the fluid in the third valve portion 6F is supplied to the third valve seat 4 as described above.
Since B is blocked, it does not flow out from the third flow path 4C.

Next, when the electromagnetic coil 8 is energized, the fixed core portion 2D, the bottom portion 2A, the tubular housing portion 2, the collar portion 4 of the valve body housing 3, the annular tubular portion 4A, the large diameter tubular portion 6, the large tubular portion 6 A magnetic circuit is formed by the upper end surface 6A of the large diameter cylindrical portion 6 and the lower end 2E of the fixed core portion 2D, and the upper end surface 6 of the large diameter cylindrical portion 6 is formed.
A is attracted to the lower end 2E of the fixed core portion 2D, whereby the movable core 5 moves upward against the spring force of the spring 9,
The second valve portion 6D closes the second valve seat 2F, while the third valve portion 6D
F opens the third valve seat 4B. According to the above, the fluid flowing from the first flow passage 4D into the second space D flows out from the third flow passage 4C via the third valve seat 4B, while the flow out of the fluid from the second flow passage 2G is blocked. To be done. Further, the fact that the retainer 7 made of a non-magnetic material is inserted and arranged on the outer circumference of the small-diameter cylindrical portion 6B of the movable core 5 is because the outer circumference of the small-diameter cylindrical portion 6B and the fixed core portion 2D
Adhesion with the inner circumference 2H can be effectively prevented, and the dynamic characteristics of the movable core 5 can be improved.

The gap S formed between the outer diameter of the large-diameter cylindrical portion 6 of the movable core 5 and the inner circumference 4E of the annular cylindrical portion 4A of the valve body housing 3 is fixed to the outer diameter of the retainer 7. Since the gap P formed between the inner circumference 2H of the core portion 2D and the inner circumference 2H is made larger, even when the movable core 5 moves laterally, the inner portion of the annular cylindrical portion 4A made of a magnetic material is formed. Since the contact between the circumference 4E and the outer circumference of the large-diameter cylindrical portion 6 formed of a magnetic material can be completely suppressed, they are not adsorbed and the dynamic characteristics of the movable core 5 can be maintained well. . Further, the configurations of the first communication passage 2J and the second communication passage 6H are not limited to the embodiment shown in the figure, and may be selected appropriately. For example, holes may be formed in the movable core 5.

[0015]

As described above, the three-way solenoid valve according to the present invention has the following effects. A movable core based on a defect (reduction in inner diameter, deterioration of concentricity) that occurs when the sleeve is fitted to the yoke and the core, because the conventionally used sleeve (the sleeve 26 in the conventional example) can be eliminated. It is possible to completely prevent the deterioration of the dynamic characteristics of (3) and greatly improve the dynamic characteristics of the movable core. By inserting and arranging the retainer made of a non-magnetic material on the outer circumference of the small-diameter cylindrical portion of the movable core, magnetic attraction of the small-diameter cylindrical portion of the movable core toward the inner circumference of the fixed core portion is suppressed, and The dynamic characteristics can be improved. The gap S formed between the outer diameter of the large-diameter tubular portion and the inner diameter of the annular tubular portion is larger than the gap P formed between the outer diameter of the retainer and the inner diameter of the fixed core portion. And the outer circumference of the large-diameter cylindrical portion of the movable core and the inner circumference of the annular cylindrical portion are not magnetically attracted, and the dynamic characteristics of the movable core can be improved. At the time of assembling work, the caulking need only be performed by caulking the lower end of the cylindrical housing portion inward toward the outer periphery of the flange portion of the valve body housing, and the work man-hours can be greatly reduced. The three-way solenoid valve can be configured by the main body housing, the valve body housing, the movable core including the retainer, and the electromagnetic coil, and the number of parts can be greatly reduced. The inner circumference of the annular cylinder part of the valve body housing that guides the movable core and the inner circumference of the fixed core part of the main body housing can all be lathe-machined, and the collar part of the main body housing is at the lower end of the cylindrical housing part. Since the outer diameter of the collar portion and the inner diameter of the lower end of the tubular housing portion can be accurately processed, the movable core can be supported by the fixed core portion and the annular tubular portion that are completely concentric.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a main body housing used in a three-way solenoid valve according to the present invention.

FIG. 2 is a vertical cross-sectional view of a valve body housing used in the three-way solenoid valve according to the present invention.

FIG. 3 is a longitudinal sectional view of a movable core including a retainer used in the three-way solenoid valve according to the present invention.

FIG. 4 is a vertical sectional view showing an embodiment of a three-way solenoid valve according to the present invention.

5 is a lateral cross-sectional view of the main part taken along the line AA of FIG.

6 is a transverse cross-sectional view of the main part taken along the line BB of FIG.

[Explanation of symbols]

1 Main body housing 2 Cylindrical housing part 2A Bottom part 2B Lower end 2D Fixed core part 2E Lower end 2F Second valve seat 2G Second passage 2H Inner circumference 2J First communicating passage 3 Valve body housing 4 Collar part 4A Annular cylindrical part 4B No. 3 valve seat 4C 3rd flow path 4D 1st flow path 4E inner circumference 5 movable core 6 large diameter cylinder part 6A upper end surface 6B small diameter cylinder part 6C upper end 6D second valve part 6E lower end surface 6F third valve part 6G outer circumference 7 retainer 8 Electromagnetic coil C First space D Second space S Gap formed between outer diameter of large-diameter tubular portion and inner diameter of annular tubular portion P Formed between outer diameter of retainer and inner diameter of fixed core portion The gap

Claims (2)

[Claims] 1. A three-way solenoid valve having a first flow path, a second flow path, and a third flow path, wherein the flow path can be switched by a movable core operated by an electromagnetic device, and a main body housing made of a magnetic material. 1, a cylindrical housing portion 2 which is directed downward from the outer periphery of the bottom portion 2A and whose lower end 2B is open.
And an annular fixed core portion 2D that is located inside the tubular housing portion 2 and extends downward from the bottom portion 2A, and faces the center of the bottom portion 2A in the inner circumference 2H of the annular fixed core portion 2D.
A valve body housing 3 made of a magnetic material and having a second flow path 2G that opens at A via a second valve seat 2F, and a collar portion 4 that closes the opening of the lower end 2B of the tubular housing portion 2.
An annular tubular portion 4A that extends upward from the collar portion 4, a third flow passage 4C that opens at the center of the collar portion 4 inside the inner periphery 4E of the annular tubular portion 4A via a third valve seat 4B, and an annular Inner circumference 4E of cylindrical portion 4A
A movable core 5 made of a magnetic material and having a large-diameter cylindrical portion 6 and a first flow path 4D that is located in the inner flange portion 4 and that opens to the flange portion 4 on the side of the third flow path 4C. , A small-diameter tubular portion 6B that extends upward from the upper end surface 6A of the large-diameter tubular portion 6, and a small-diameter tubular portion 6B.
An annular retainer 7 made of a non-magnetic material, which is inserted in the axial direction of the outer periphery 6G, a third valve portion 6F arranged on the lower end surface 6E of the large diameter tubular portion 6 to open and close the third valve seat 4B, and a small diameter tubular portion. Part 6B
And a second valve portion 6D which is arranged at the upper end 6C of the cylindrical housing portion 2 to open and close the second valve seat 2F. The electromagnetic coil 8 is arranged on the bottom portion 2A of the cylindrical housing portion 2 and the cylindrical housing portion 2
The opening of the lower end 2B of the valve body 3 is closed by the collar portion 4 of the valve body housing 3 to form the first space C in the inner circumference 2H of the fixed core portion 2D, and the lower end 2E of the fixed core portion 2D and at least an annular cylinder. A second space D is formed by the inner circumference 4E of the portion 4A. In the second space D, the third valve portion 6F faces the third valve seat 4B, and the upper end surface 6A thereof is fixed core portion 2
The large-diameter cylindrical portion 6 of the movable core 5 is movably arranged so as to face the lower end 2E of D. In the first space C, the second valve portion 6D faces the second valve seat 2F and the spring 9 The small diameter cylindrical portion 6B including the retainer 7 urged so that the second valve portion 6D is separated from the second valve seat 2F is movably arranged, and further, the fixed core portion 2D or the small diameter cylindrical portion 6B including the retainer 7 is disposed. Is the first space C
And a second space D are formed to form a first communication passage 2J, and the large-diameter cylindrical portion 6 is formed with a second communication passage 6H that communicates the upper end surface 6A and the lower end surface 6E of the large-diameter cylindrical portion 6. Three-way solenoid valve. 2. The outer diameter of the large-diameter cylindrical portion 6 and the annular cylindrical portion 4
The three-way solenoid valve according to claim 1, wherein the gap S formed between the inner diameter of A and the inner diameter of the retainer 7 is larger than the gap P formed between the outer diameter of the retainer 7 and the inner diameter of the fixed core portion 2D.