JPH0339663Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an electromagnetic valve that controls the flow of fluid such as air intermittently.

[Conventional technology] Solenoid valves that have been proposed so far include:
Various structures are known. For example, as in U.S. Pat. There is one in which movable cores are arranged opposite to each other to which a shaft having a valve on the lower side is connected. Then, by energizing or de-energizing the solenoid, an opening provided in the lower case is closed or opened via the valve to adjust the sending of air in a predetermined direction.

Furthermore, disk springs are attached to the upper and lower ends of the shaft to support the shaft so as to be movable in the axial direction. This restricts the swinging of the shaft in the left-right direction, so the valve can be opened and closed accurately, resulting in an extremely reliable electromagnetic valve.

[Problems to be solved by the invention] By the way, when the shaft is supported by two disk springs disposed vertically and oppositely as described above, the swinging of the shaft in the left and right direction is restricted, but this is not enough. The manufacturing tolerances allowed for the valve are reduced. That is, if the valve is installed at an angle with respect to the shape of the valve or the shaft, the valve will not be able to be completely sealed when the valve is closed, and there is a risk of fluid leakage. The present invention was developed in view of the above-mentioned drawbacks, and allows for a slight amount of inclination in the left and right directions with respect to the shaft, allowing for valve closing and opening operations without reducing the manufacturing tolerances required for the valve. The purpose is to ensure that this can be done.

[Means for Solving the Problems] The electromagnetic valve of the present invention has the following configuration.
In other words, a movable core placed opposite to a fixed core,
A housing accommodates a shaft connected to the movable core and having a valve at its lower end, and a pair of disc springs disposed at the upper and lower ends of the shaft to support the shaft movably in the axial direction. In the electromagnetic valve, between the outer circumference of a disk spring disposed on the upper end side of the shaft and the inner surface of the housing, and between the outer circumference of the disk spring disposed on the lower end side of the shaft and the inner surface of the housing. A gap is formed in at least one of the two, the gap being larger than the other.

[Function of the invention] The present invention is designed to reduce the distance between the outer periphery of the disc spring disposed on the upper end side of the shaft and the inner surface of the housing, and between the outer periphery of the disc spring arranged on the lower end side of the shaft and the inner surface of the housing. A gap is formed in at least one of the two, the gap being larger than the other. Therefore, the shaft can swing in the left-right direction around the disc spring having the gap with the smaller gap. Therefore, even if the valve is tilted due to manufacturing tolerances and cannot fit tightly against the valve seat, for example, if the valve is installed tilted relative to the shaft, the shaft itself will swing to correct the tilt of the valve, making it impossible to close the valve. When valving, the valve and valve seat are completely and securely in contact.

[Example] The details of the present invention will be explained below using the example shown in FIGS. 1 and 2.

FIG. 1 is a sectional view showing an embodiment of the electromagnetic valve according to the present invention. The housing of the electromagnetic valve is constructed by combining a cylindrical upper case 1 and a lower case 2. Inside the upper case 1 is a cylindrical yoke 3 made of an elastic ferromagnetic pair.
The structure is such that it accommodates. Further, a solenoid 4 is arranged within the yoke 3. A substantially disk-shaped base plate 5 is fixed to the lower end of the upper case 1 so as to be located below the yoke 3 and the solenoid 4. In addition, a fixed core 6 and a movable core are arranged vertically in a hole provided in the center of the solenoid 4 and the base plate 5. That is, the movable core 7 is arranged to face the fixed core 6 with a predetermined gap therebetween. On the other hand, the lower case 2 is provided with an air inlet section 2a and an air outlet section 2b, and an opening section 2c is provided between the air inlet section 2a and the air outlet section 2b. . Further, a cylindrical mounting member 8 is housed within the lower case 2. A retainer 9 that partitions a hollow portion in the transverse direction and is formed integrally with the mounting member 8 is fixedly attached to the upper portion of the mounting member 8 . The outer circumferential edge of the lower disc spring 10 is sandwiched between the lower end of the mounting member 8 and the inner step 2d of the lower case 2.
Further, a shaft 12 is integrally connected to the movable core 7 via a connecting portion 11 having a small diameter, and the inner peripheral edge of the disc spring 10 is connected to the stepped portion 12a of the shaft 12 and the collar. 13. This disk spring 10 always urges the shaft 12 upward.
The collar 13 is press-fitted into the lower end 12b of the shaft 12. Further, a valve 14 is disposed below the collar 13 and is fixed to the lower end portion 12b of the shaft 12 by caulking. Valve 1
4 opens and closes the opening 2c by abutting and separating the lip 14a located on the outer peripheral edge of the valve seat 15 of the lower case 2, thereby allowing air to flow in from the inlet portion 2a. It is configured to block or release the air.

The figure shows a state in which air is cut off, that is, a closed state. Further, an adjusting screw 16 is screwed into a screw hole 2e provided at the bottom of the lower case 2, and a first return spring 17 is inserted between the adjusting screw 16 and the valve 14. It has been intervened. Further, a spring receiver 18 is located slightly above the lower end 12b of the shaft 12.
A second return spring 1 is attached between the spring receiver 18 and the retainer 9.
9 is interposed. Furthermore, a bellows 20 is disposed on the outer periphery of the shaft 12 so as to be located between the retainer 9 and the disc spring 10. A disc spring 21 is also provided on the upper end side of the shaft 12. This disc spring 21 has its inner peripheral edge held between the movable core 7 and the upper end of the shaft 12, and its outer peripheral edge held between the yoke 5 and the mounting member 8. This disc spring 21 is attached to the shaft 1
2 is constantly pressed downward,
The shaft 12 is supported together with the other disc spring 10 so as to be movable in the axial direction.

In the electromagnetic valve configured as above,
When the solenoid 4 is de-energized, the shaft 12 is pressed downward due to the elastic force of the upper disc spring 21, and the lip valve 14a of the valve 14 attached to the lower end 12b of the shaft 12 is pressed against the lower case 2. The valve is in a closed state in which the opening 2c is closed by contacting the valve seat 15 of the valve. When the solenoid 4 is energized from this state, a magnetic path is formed between the fixed core 6, the cylindrical yoke 3, the disc-shaped yoke 5, and the movable core 7, and the movable core 7 is connected to the fixed core 6. Gap
Move up to shorten G ₃ . Therefore, the shaft 12 connected to the movable core 7 also moves toward the fixed core 6, that is, upward. As a result, the valve 14 on the lower side of the shaft 12 is also lifted upward, and the lip valve 14a of the valve 14 is separated from the valve seat 15, so that the opening 2c is opened, resulting in a so-called open state. This allows air to move from the air inlet section 2a through the opening 2c to the air outlet section 2b.

FIG. 2 explains the operation of each gear and shaft 12. Gap of the disc spring 10 arranged on the lower end side of the shaft 12
G ₁ , the gap G ₂ of the disk spring 21 disposed on the upper end side of the shaft 12 and the fixed core 6
The gaps G ₃ between the valve 14 and the movable core 7 are provided out of necessity to accommodate the relatively large manufacturing tolerances of the valve 14. Furthermore, the feature of this embodiment is that between each of the gap G ₁ , G ₂ , and G ₃ , the gap G ₂ is set larger than the gap G ₁ , and the gap G ₃ is set larger than the gap G ₂ . At the point you set. In other words, gap G ₁ < gap G ₂ < gap G ₃ . Further, the gap _G1 may be zero.
With such a configuration, when the shaft 12 swings while moving in the vertical direction, the minimum gap G ₁
It is possible to swing in the left-right direction around a disk spring 10 that forms a center. That is, by allowing relatively large manufacturing tolerances for the valve 14, the shaft 1
If the installation error of the valve 14 with respect to the shaft 12 increases, the valve 14 will be tilted by θ with respect to the shaft 12, as shown by the two-dot chain line in the figure.
Even if a part of the valve 14 is no longer able to come into close contact with the valve seat 15, when the valve 14 first comes into partial contact with the valve seat 15, the shaft 12 is moved in order to bring the uncontacted part of the valve 14 into close contact with the valve seat 15. It can be tilted by θ in the left-right direction around the support provided by the disc spring 10. Therefore, when the valve is opened, the lip 14a of the valve 14 touches the valve seat 1.
5 and can completely close the opening 2c.

Note that the present invention is not limited to the above-mentioned embodiments, and can be applied in various ways. For example, regarding the gap, G ₁ >G ₂ may be set contrary to the embodiment, or the gap may be formed only in either G ₁ or G ₂ . This is because the shaft supported by the pair of disc springs can be allowed to tilt in the left-right direction.

[Effect of the invention] According to the electromagnetic valve related to the invention, the outer periphery of the disc spring located between the outer periphery of the disc spring arranged on the upper end side of the shaft and the inner surface of the housing, and the outer periphery of the disc spring arranged on the lower end side of the shaft. A gap is formed in at least one of the gaps and the inner surface of the housing, the gap being larger than the other gap. Therefore, even if the valve is tilted due to manufacturing tolerances and cannot be firmly attached to the valve seat, the shaft itself can swing, so even a valve installed at an angle can be attached tightly to the valve seat. Therefore, relatively large manufacturing tolerances can be tolerated for the valve, which is a significant manufacturing advantage.

[Brief explanation of the drawing]

1 and 2 are examples, and FIG. 1 is a sectional view showing an example of the electromagnetic valve according to the present invention,
FIG. 2 is an operational explanatory diagram showing only the main parts. (Explanation of symbols), 6... Fixed core, 7... Movable core, 10, 21... Disc spring, 12...
Shaft, 12b...lower end, 14...valve.

Claims (1)

[Scope of utility model registration request] a movable core disposed to face the fixed core; a shaft connected to the movable core and having a valve at its lower end; and a pair of shafts disposed at the upper and lower ends of the shaft to support the shaft movably in the axial direction. In the electromagnetic valve including a disc spring housed in a housing, a circle is arranged between the outer periphery of the disc spring disposed on the upper end side of the shaft and the inner surface of the housing, and on the lower end side of the shaft. An electromagnetic valve characterized in that a gap is formed in at least one of the outer periphery of the plate spring and the inner surface of the housing, the gap being larger than the other.