JP3353097B2 - Valve device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is mainly used for deburring molded products by spraying a high pressure liquid from a nozzle, removing scales formed on the surface of a steel product, or cutting a material into a predetermined shape. The present invention relates to a valve device used as an on-off valve when the supply of high-pressure liquid to the nozzle is performed intermittently and the operation such as deburring is repeatedly performed at predetermined time intervals.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 2, this type of valve device has a fluid passage B comprising a vertical hole provided in a valve body A and a horizontal hole extending laterally from the upper end of the vertical hole. A valve seat C is disposed in the vertical hole, and a guide hole D extending vertically and communicating with the vertical hole is formed above the fluid passage B in the valve body A, and the valve hole is formed in the guide hole D. A vertically elongated shaft-shaped valve element E which is in contact with the sheet C and opens and closes the fluid passage B is slidably provided, and the valve element E is attached to the upper end of the valve element E. A lower end of an operating rod F that is pushed in the direction of the valve seat C is integrally connected, and a pair of upper and lower cylindrical adapters G and H are provided between the valve body E and the guide hole D.
And the sealing material I is inserted between these adapters G and H.
And the screw member N is screwed into the upper end opening of the guide hole D so that the sealing member I seals the space between the valve body E and the guide hole D in an airtight manner. ing. Further, on the upper side of the operating rod F, a pressing spring J for pressing the operating rod F downward to close the fluid passage B with the valve body E, and the operating rod F by the pressing spring J A fluid pressure chamber K that moves upward against the pressing force to open the fluid passage B by the valve body E is provided. In the figure, L is a connection pipe screwed into the inlet of the fluid passage B in the valve body A, and M is a diaphragm.

[0003] The valve device constructed as above is
For example, the inlet of the fluid passage B is connected to a high-pressure fluid pipe of a high-pressure pump, and the outlet of the fluid passage B is connected to a nozzle via a liquid feed pipe, and is used as an on-off valve. When performing the deburring operation of the components, the compressed air is supplied to the fluid pressure chamber K so that the operating rod F
By moving the valve body E and the valve body E upward against the pressing force of the pressing spring J, the fluid passage B is opened, and the high-pressure liquid is ejected from the nozzle. When the deburring operation is completed and the process waits temporarily until the deburring operation of the next part, the fluid pressure chamber K is set to a low pressure, and the operating rod F and the valve body E are pressed by the pressing force of the pressing spring J. Is moved downward to close the fluid passage B and temporarily stop the ejection of the high-pressure liquid from the nozzle.

[0004]

However, in the conventional valve device as described above, the valve body E and the operating rod F are integrally connected, and the operating rod F and the valve body E are pressed by the pressing means. Spring J
And the fluid pressure supplied to the fluid pressure chamber K is moved up and down to open and close the fluid passage B by the valve body E. If there is a defective discharge, the valve body E comes into a one-sided contact state with the valve seat C, and a reliable seal between the two cannot be performed. There is a problem that uneven wear of E and the valve sheet C is caused.

[0005] If there is a centering defect in the valve element E,
The valve body E is inclined with respect to the center line of the valve seat C between the operating rod F and the valve seat C, and is pressed by the pressing spring J in this inclined state. There is also a problem that a bending load acts on E, and the strength of the valve body E is reduced, so that durability is deteriorated.

Further, as described above, when the valve body E and the operating rod F are integrally connected, when the sealability with respect to the valve seat C is deteriorated due to wear of the valve body E or the like, It is necessary to replace both the valve body E and the operating rod F together, which increases maintenance cost. In addition, the valve body E comes into contact with the valve seat C and the fluid passage B In order to open and close, it is preferable to use a hard material such as ceramics or diamond as a raw material in order to reduce the wear of the valve body E, but when using such a hard material, the valve body E and There is also a problem that the coupling with the operating rod F is very difficult to be performed and the cost of the valve device is increased.

SUMMARY OF THE INVENTION It is an object of the present invention to eliminate the need to particularly center a valve body with respect to a valve seat. Abrasion can be eliminated, and a bending load can be prevented from acting on the valve body. Further, when the sealing performance with respect to the valve seat is deteriorated due to wear of the valve body, the valve may be used. An object of the present invention is to provide a valve device capable of reducing maintenance cost by replacing only a body.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the invention according to claim 1 is directed to a fitting hole provided in the middle of a fluid passage and a hole connected to the fitting hole and concentric with the fitting hole. A valve body having a provided guide hole, a circular valve seat fitted in the fitting hole, a valve body abutting on the valve seat in the guide hole to open and close the fluid passage, and the guide Pressing means for pressing the valve body against the valve seat via an operating rod inserted into the hole, driving means for operating the operating rod by overcoming the pressing force of the pressing means, and between the operating rod and the guide hole And a seal member for sealing the gap between the guide hole and the guide hole, the circumference of the valve body is equal in diameter to the fitting hole, and the valve body is slidably fitted in the guide hole. The operating rod is detachable on the opposite side of the valve body from the valve seat. Characterized in that contact.

[0009]

First, when the fluid passage is opened, the operating rod is moved in the direction opposite to the valve body by overcoming the pressing force of the pressing means by the operation of the driving means, and is thereby formed separately from the operating rod. The pressing force of the operating rod against the valve element disposed in the guide hole is released, so that the valve element is in a free state, and the valve element is deflected by the high-pressure fluid supplied to the fluid passage. The fluid passage is moved in the valve seat direction, the fluid passage is opened, and the high-pressure fluid flows.

On the other hand, when closing the fluid passage,
By releasing the movement of the operating rod in the direction opposite to the valve body by the driving means, the operating rod is moved in the valve seat direction by the pressing means, and accordingly, the valve arranged in the guide hole in a free state. The body is pressed toward the valve seat by the operating rod, the fluid passage is closed, and the flow of the high-pressure fluid is stopped.

As described above, the valve body 5 is separated from the operating rod 6, and the valve body 5 is slidably disposed in the guide hole 4, so that the fluid passage formed by the valve body 5 is provided. When closing the fluid passage 2, the valve means 5 is moved in the direction of the valve seat 3 to close the fluid passage 2 by the movement of the operating rod 6 by the pressing means 20, and when the fluid passage 2 is opened. Instead of moving the valve element 5 integrally with the operating rod 6, the pressing force of the operating rod 6 against the valve element 5 is released by the operation of the driving means 30, and the valve element 5 is set in the free state. The valve body 5 is moved in the direction opposite to the valve seat by using the high-pressure fluid introduced into the fluid passage 2 to open the fluid passage 2, so that the valve device can be assembled at the time of assembly of the valve device. Since the valve element 5 is disposed in the guide hole 4 in a free state, Unlike the conventional case in which the operating rod 6 and the valve body 5 are integrally connected, the valve body 5 does not have a centering failure, and the valve body 5 and the valve seat 3 are connected to each other. The gap can be sealed well, the uneven wear of the valve element 5 and the valve seat 3 can be eliminated, and the valve element 5 is slidable without being connected to the operating rod 6. 5 can be prevented from acting on a bending load. In addition, the valve seat 3 may be worn due to wear of the valve body 5 or the like.
If the sealing performance with respect to
In addition, the maintenance cost can be reduced by performing only the replacement, and the valve body 5 and the operating rod 6 are formed separately so that they are separated from each other without being connected to each other. The structure of each person is simplified, and the cost of the valve device can be reduced.

Further, in the above structure, the high-pressure fluid passing through the fluid passage 2 is supplied to the front of the guide hole 4 in the movement direction when the valve element 5 opens between the operating rod 6 and the guide hole 4. Sealing material 9 for preventing leakage to the outside through 4
Since a fluid having different pressures is allowed to flow depending on the use of the valve device, by setting the sealing material 9 to a sealing force at the time of using a high pressure,
Even when a fluid having a pressure lower than the fluid pressure corresponding to the set sealing force is circulated, the opening and closing operation of the valve element 5 can be reliably performed while the seal member 9 can prevent fluid leakage from the guide hole 4. it can. That is, the valve element 5 is slidably disposed in the guide hole 4, and the valve element 5 is not operated to follow the operating rod 6 but is supplied to the fluid passage 2. Since the operation is performed by the fluid, the opening and closing operation of the valve element 5 can be reliably performed even when fluids having different pressures are circulated.

[0013]

1 shows a valve device according to the present invention.
In this valve device, a fluid passage 2 bent into an L-shape including a vertical hole 2a and a horizontal hole 2b extending laterally from an upper end portion of the vertical hole 2a is provided on a lower side of the valve body 1 in the vertical direction. A receiving step portion 2c is provided in the vertical hole 2a of the passage 2, and the receiving step portion 2c is provided.
A cylindrical valve seat 3 having a vertical hole portion above it as a fitting hole and a flange portion in the fitting hole abutting on the receiving step 2c.
As shown in FIG. 1, the connecting pipe 11 is screwed to the lower end of the vertical hole 2a, and the flange of the valve seat 3 is pressed against the receiving step 2c, and the valve seat 3 is It is held in the vertical hole 2a, and on the upper side of the vertical hole 2a in the fluid passage 2,
A guide hole 4 communicating with the fitting hole of the vertical hole 2a is formed so as to penetrate in the up-down direction, and is seated and disengaged from the valve seat 3 at a lower portion of the guide hole 4 at a boundary portion with the fluid passage 2. The valve body 5 that opens and closes the fluid passage 2 is slidably disposed, while the valve body 5 is provided above the guide hole 4.
A vertically long operating rod 6 for operating the valve body 5 in the direction of the valve seat 3 is slidably disposed. The lower part of the guide hole 4 has the same diameter as the fitting hole at the periphery of the valve body as shown in FIG.

The valve element 5 is capable of self-alignment with respect to the valve seat 3. That is, a conical or spherical seating surface 51 is provided on the valve seat side of the valve element 5, and the seating surface 51 is provided.
Is seated on the valve seat 3 so that the valve body 5
When the valve seat 3 is deviated from the axis of the guide hole 4, the valve seat 3 is automatically aligned with the seating surface 51.
, And can surely prevent fluid leakage from the fluid passage 2.

The outer peripheral portion of the valve body 5 excluding the abutting portion with the valve seat 3 is a portion having the same diameter as the fitting hole of the guide hole 4 as shown in FIG. It is slidably fitted. A plurality of communication holes 52 penetrating in the axial direction are formed in the outer peripheral portion of the valve body 5 at predetermined intervals in the circumferential direction so as to supply the valve body 5 to the fluid passage 2 as described later. When the high-pressure fluid is opened, the fluid passage 2 is communicated with the back surface of the valve body 5 through the communication hole 52, so that the pressure between the back surface of the valve body 5 and the fluid passage 2 is increased. A smooth opening operation of the valve element 5 can be performed without any difference.

Further, a receiving step 4a is provided on the front side in the moving direction when the valve body 5 is opened by the guide hole 4, that is, on the upper side of the valve body 5 in FIG. A pair of upper and lower tubular adapters 7 and 8 are inserted into the upper side of the adapter, the outer peripheral portion of the lower side adapter 8 is received by the receiving step 4a, and the fluid passage is provided between the adapters 7 and 8. 2 is provided with a sealing member 9 for preventing the high-pressure fluid passing through the guide hole 4 from leaking outward through the guide hole 4. It has an insertion hole 10a through which the rod 6 is inserted, and is screwed with a connector 10 for connecting to an operation unit described later.
The adapter 7 and the sealing material 9 are pressed against the adapter 8 so that the sealing force of the sealing material 9 can be set.

On the other hand, a box 14 having a connecting member 13 which is screwed to the upper side of the connecting member 10 is mounted on the upper part of the valve body 1 and the operating rod 6 is always kept inside the box 14. Pressing means 20 which presses downward and presses the valve body 5 against the valve seat 3 with the operating rod 6 to close the fluid passage 2, and presses the operating rod 6 to the pressing force of the pressing means 20. A driving means 30 is provided for opening the closing of the fluid passage 2 by the valve body 5 by moving the valve body 5 upward.

More specifically, the driving means 30 includes a curved and deformable horizontal diaphragm 31 which defines the inside of the box 14 up and down, and the operating rod 6 is provided at a central portion of the diaphragm 31. Is fixedly supported via upper and lower mounting members 32 and 33, and a fluid pressure chamber 34 for a control fluid such as compressed air is formed below the box 14 defined by the diaphragm 31. A supply / discharge port 35 for supplying / discharging control fluid to / from the fluid pressure chamber 34 is provided on a side portion of the box 14. Then, a control fluid such as high-pressure compressed air that overcomes the pressing means 20 is supplied from the supply / discharge port 35 into the fluid pressure chamber 34, and the diaphragm 31 is leveled against the pressing force of the pressing means 20. The valve body 5 is freely deformed by being bent upward from the state, thereby moving the operating rod 6 upward and releasing the pressing force of the operating rod 6 against the valve body 5. As a result, the valve element 5 is moved upward by the high-pressure fluid introduced into the fluid passage 2 to open the fluid passage 2.

The pressing means 20 includes a pressing spring 21 provided inside the box 14 at an upper side thereof. The pressing means 20 is provided with a mounting member 32 provided on the upper side of the diaphragm 31 and an upper wall of the box 14. On the upper wall of the box 14,
The distal end is in contact with the spring receiver 22, and is provided with an adjusting screw 23 capable of arbitrarily adjusting the spring force of the pressing spring 21. When the fluid passage 2 is closed by the valve element 5, the introduction of the control fluid into the flow pressure chamber 34 in the box 14 is stopped, and the control fluid in the fluid pressure chamber 34 is supplied from the supply / discharge port 35. The operating rod 6 is moved downward by the pressing force of the pressing spring 21, and the valve body 5 is pressed toward the valve seat 3 to close the fluid passage 2. That's how it works.

The pressing spring 21 is set so as to have a stronger spring force than the high-pressure fluid passing through the fluid passage 2 via the adjusting screw 23, thereby opening the valve body 5 from the open state. When performing the closing operation, the fluid passage 2
Although the high-pressure fluid passing through acts on the valve body 5, the closing operation of the valve body 5 can be performed.

Next, the operation of the above configuration will be described. For example, when performing deburring work of a molded product using the above valve device, a high-pressure fluid pipe extending from a high-pressure pump is connected to a connection pipe 11 provided in the fluid passage 2 of the valve body 1, and A nozzle is connected to the outlet side of the nozzle via a liquid feed pipe, and the high-pressure pump supplies the high-pressure liquid to the liquid feed passage 2. Then, high-pressure compressed air that overcomes the pressing force of the pressing spring 21 is introduced into the fluid pressure chamber 34 of the driving unit 30 from the supply / discharge port 35. Then, the diaphragm 31 in the box 14 is introduced.
Is bent upward from the horizontal state against the pressing force of the pressing spring 21, whereby the operating rod 6 is moved upward, and the pressing force of the operating rod 6 on the valve element 5 is reduced. Will be released. Therefore, the valve element 5 can be freely moved, the valve element 5 is moved upward by the high-pressure fluid introduced into the fluid passage 2, the fluid passage 2 is opened, and the high-pressure liquid is discharged from the nozzle. It is ejected, and a deburring operation of one part is performed.

In the case where the deburring operation of one component is completed as described above and the jetting of the high-pressure liquid from the nozzle is temporarily stopped until the deburring operation of the next component is performed, a standby is performed. The introduction of the control fluid into the fluid pressure chamber 34 in the box 14 is stopped, and the compressed air in the fluid pressure chamber 34 is discharged from the supply / discharge port 35 to the outside. As a result, the operating rod 6 is moved downward, and accordingly, the valve element 5 which is positioned in the guide hole 4 in a free state is pressed toward the valve seat 3, and the fluid passage 2 is closed. The ejection of the high-pressure fluid from the nozzle is stopped.

In the above valve device, the valve element 5 is formed separately from the operating rod 6, and the valve element 5 is slidably disposed in the guide hole 4 so that the fluid generated by the valve element 5 Passage 2
When the valve is closed, the operating rod 6 is moved downward by the pressing force of the pressing spring 21 to move the valve element 5 toward the valve seat 3 to close the fluid passage 2. When the valve is opened, the pressing force of the operating rod 6 against the valve element 5 is released by the operation of the driving means 30 instead of moving the valve element 5 integrally with the operating rod 6, and the valve element 5 is released. Since the valve body 5 is moved in the direction opposite to the valve seat by using the high-pressure liquid supplied to the fluid passage 2 and the fluid passage 2 is opened, the valve device 5 is assembled. In some cases, the valve body 5 formed separately from the operating rod 6 is simply inserted into a boundary portion between the guide hole 4 and the fluid passage 2 so that the seating surface 51 of the valve body 5 is formed.
Is made conical or spherical, and the valve body 3 can be automatically aligned with the valve seat 3 without causing the valve body 5 to be poorly centered. 3, the valve body 5 and the valve seat 3 can be prevented from being unevenly worn, and no bending load or the like acts on the valve body 5. 5 can also be prevented from lowering in durability. In addition, when the sealing performance with respect to the valve seat 3 is deteriorated due to the wear of the valve element 5, the maintenance cost can be reduced, since only the valve element 5 has to be replaced. Since the valve element 5 and the operating rod 6 are formed separately and there is no need to provide a coupling means between the valve element 5 and the operating rod 6, the structure of each of the members is simplified and the cost of the valve device is reduced. You can also.

Further, in the above valve device, a high-pressure liquid of, for example, about 1000 to 1500 kgf / cm ₂ is selectively used depending on its use. Since the seal member 9 is interposed via the adapters 7 and 8 on the front side in the movement direction when the valve body 5 opens during the opening operation, the liquids having different pressures as described above are supplied. At the time of distribution, by setting the sealing material 9 to the sealing force when using high pressure,
The opening and closing operation of the valve element 5 can be reliably performed even when a liquid having a pressure lower than the liquid pressure corresponding to the set sealing force is circulated, while the sealing member 9 can prevent liquid leakage from the guide hole 4. Can be. That is, the valve element 5 is slidably disposed in the guide hole 4, and the valve element 5 is not operated integrally with the operating rod 6, but the liquid introduced into the fluid passage 2. Therefore, even when liquids having different pressures are allowed to flow, the valve element 5 can be used.
The opening and closing operation can be performed reliably.

When the above-described pressing spring 21 is used as the pressing means 20, the valve device of the present invention can be used not only as the above-mentioned on-off valve but also as a safety valve.

Further, the pressing means 20 and the driving means 3
As 0, in addition to the above-described embodiment, for example, a forward / reverse rotating motor is used, and the forward / backward rotation of the motor forcibly moves the operating rod 6 in the vertical direction. The opening and closing of the fluid passage 2 may be performed by the opening and closing operation of the valve element 5, and the pressing spring 21 in FIG. 1 may be eliminated, and the upper side may be provided in the box 14 defined by the diaphragm 31. A fluid pressure chamber and a lower fluid pressure chamber are provided, and a control fluid such as compressed air or a pressurized liquid is selectively supplied / discharged to / from these fluid pressure chambers, and the operating rod 6 is moved through the diaphragm 31. The fluid passage 2 may be opened and closed by the valve body 5 by moving the valve body 5 up and down.

[0027]

As described above, according to the valve device of the present invention, when the operating rod is releasably brought into contact with the valve body to open the fluid passage, the operating rod is forcibly operated by the driving means. To release the pressing force on the valve body by the pressing means,
Since the valve element is set in the free state and the valve element is opened using the high-pressure fluid supplied to the fluid passage, it is possible to prevent the valve element from being misaligned. The gap between the valve body and the valve seat can be satisfactorily sealed, and uneven wear of the valve body and the valve seat can be eliminated. Can be prevented from acting on the valve body, and the durability of the valve body can be prevented from being reduced. Further, when the sealing property to the valve seat is deteriorated due to wear of the valve body or the like, only the valve body is replaced. The valve body and the operating rod can be separated from each other without being connected to each other, so that the structure of the valve body and the operating rod can be simplified, and the valve device can be simplified. Costs can be reduced.

Further, the high-pressure fluid passing through the fluid passage 2 flows outward through the guide hole 4 in the forward direction in the moving direction when the valve body 5 opens between the operating rod 6 and the guide hole 4. The sealing material 9 that prevents leakage to the side is interposed, so that when a fluid having a different pressure is circulated depending on the use of the valve device, the sealing material 9 is set to a sealing force when a high pressure is used. Thereby, while the fluid leakage from the guide hole 4 can be prevented by the seal member 9, the opening and closing operation of the valve element 5 can be reliably performed even when a fluid having a pressure lower than the fluid pressure corresponding to the set sealing force flows. Can be done.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a valve device according to the present invention.

FIG. 2 is a sectional view showing a conventional valve device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Valve main body 2 Fluid passage 3 Valve seat 4 Guide hole 5 Valve 6 Operating rod 9 Sealing material 20 Pressing means 30 Driving means

Claims (1)

(57) [Claims] A fitting hole provided in the middle of the fluid passage ;
A guide hole connected to the fitting hole and formed concentrically with the fitting hole.
A circular valve seat fitted in the fitting hole.
And over DOO, a valve body for opening and closing the fluid communication path wherein the valve sheet in contact with the guide hole, is inserted into the guide hole
Pressing means to press the valve body to the valve seat via the operating rod
The operating rod by overcoming the pressing force of the pressing means.
A driving hand stage Ru is operated between the operating rod and the guide hole
In a valve device provided with a sealing material for sealing a gap,
The guide hole surrounding the valve body has the same diameter as the fitting hole.
The valve element is slidably fitted in the guide hole.
The operating rod is separated from the valve body on the side opposite to the valve seat.
A valve device which is in contact with the valve as much as possible .