JPH0451269Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The present invention relates to a safety valve having an adjustment ring that is rotatably provided on the outer periphery of a valve seat and that adjusts the gap between it and the valve body. Regarding the mechanism.

BACKGROUND ART Conventionally, safety valves of this type are known with various structures. For example, as shown in FIG. 7, a valve body 41 is housed in a casing 43, and a valve seat 40 is screwed into a lower part of the casing 43.
and an adjustment ring 42 that is screwed onto the upper outer periphery of the valve seat 40.After adjusting the adjustment ring 42 by rotating it forward and backward as appropriate, tighten the setscrew 44 that passes through the casing 43 to tighten its tip. The adjustment ring 42 is engaged with the tooth portion 42a on the outer circumference of the adjustment ring 42,
Some devices are configured to hold the adjustment ring 42 at the adjustment position. In the above safety valve, adjustment ring 4
2 relative to the valve seat 40, the gap between the upper end surface of the adjusting ring 42 and the lower end surface of the valve body 41 is adjusted, thereby adjusting the blowing start pressure.

Problems to be Solved by the Invention However, with the structure described above, when adjusting by rotating the adjustment ring, the set screw is loosened once, the adjustment ring is rotated to adjust the gap, and then the set screw is tightened again. Since the adjustment ring must be retightened to lock it at the adjustment position, there was a problem in that the adjustment work of the adjustment ring was very frequent.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a safety valve that allows easy adjustment of the adjustment ring in order to solve the above-mentioned problems.

Means for Solving the Problems In order to achieve the above object, the present invention provides a method of bringing a wire into contact with the adjusting ring or the valve seat and holding the adjusting ring in a predetermined position by the frictional force between the two members. It was configured so that it can be done. That is, in a safety valve that includes a valve seat, a valve body that approaches and separates from the valve seat, and an adjustment ring that is screwed onto the outer circumferential surface of the valve seat and can rotate in the forward and reverse directions, the circumferential surface of the adjustment ring has a circumferential direction. A groove extending along the groove is formed, and a wire rod that contacts the bottom surface of the groove is fitted into the groove, so that a frictional force acts between the wire rod and the adjustment ring or between the wire rod and the valve seat. The adjustment ring is held in a predetermined position relative to the valve seat.

Effects and effects of the invention In the above configuration, the adjusting ring is held at the adjusted position by using the frictional force between the wire rod and the adjusting ring or the frictional force between the wire rod and the valve seat instead of the set screw. Therefore, when adjusting the adjustment ring, first rotate the adjustment ring against the above frictional force, and after adjustment, simply release the adjustment ring and the connection between the wire and the adjustment ring or the valve seat will be adjusted again. Frictional forces hold the adjustment ring in the adjustment position. Therefore, it is not necessary to rotate the set screw each time the adjustment ring is adjusted, and a tool for rotating the set screw is also not required, making it possible to perform the adjustment work of the adjustment ring very easily. In addition, since the adjustment ring is held by the frictional force between the adjustment ring or the valve seat and the wire, when the adjustment ring is held in position, it is ensured that the adjustment ring is at the desired adjustment position without shifting from the adjustment position. can be retained. Further, since the wire contacts the adjustment ring or the valve seat within a certain range and exerts a frictional force, the adjustment ring can be held at a predetermined position without being forced to tilt with respect to the valve seat. . In other words, if a position-holding force acts on only one point of the adjustment ring, such as with a set screw, the position-holding force forces the adjustment ring to tilt relative to the valve seat, creating an unnecessary gap between the adjustment ring and the valve seat. There were some things that happened. In addition, since there is no through hole in the casing, fluid blown from between the valve seat and the valve body will not leak from the through hole, and there is no need to provide a gasket between the through hole and the set screw. Furthermore, the work of installing the gasket and the work of replacing the gasket when it is damaged become unnecessary.

Embodiments Below, embodiments of the present invention will be described in detail based on FIGS. 1 to 6.

<First Embodiment> As shown in FIG. 1, the safety valve according to the first embodiment includes a valve body 2, a valve seat 3 on which the valve body 2 approaches and separates,
An adjustment ring 4 is provided which is screwed onto the outer periphery of the upper part of the valve seat 3, and after the adjustment ring 4 is rotated in the forward and reverse directions as appropriate, a The adjustment ring 4 is configured to be held in the adjustment position by frictional force. In the above safety valve, by appropriately rotating the adjusting ring 4 in forward and reverse directions with respect to the valve seat 3, the gap between the upper end surface of the adjusting ring 4 and the lower end surface of the valve body 2 is adjusted, and the pressure at the start of blowing and the end of blowing are adjusted. It is designed to adjust the pressure.

The adjustment ring 4 has a substantially semicircular groove 4a formed all around the lower part of its outer peripheral side surface.

As shown in FIG. 2, the wire 5 is curved and fitted to more than half of the groove 4a, so that a frictional force acts between the bottom surface of the groove and the wire 5. The central portion of this wire 5 projects outward in a U-shape to form a curved portion 5a. A pin 6 whose lower end is fitted and fixed in the hole member 3a of the valve seat 3 is fitted into the curved portion 5a to prevent the wire 5 from rotating together with the adjustment ring 4. , fix the wire 5 to the valve seat 3.

In the safety valve having the above configuration, when rotating the adjusting ring 4, the adjusting ring 4 may be forcibly rotated against the frictional force between the wire 5 and the adjusting ring 4. When the adjustment ring 4 is rotated to a predetermined position and released, the adjustment ring 4 is held at the new adjustment position again by the frictional force between the wire 5 and the bottom surface of the concave groove of the adjustment ring 4. Note that when the adjustment ring 4 is rotated, the wire 5 is connected to the pin 6.
Since it is fixed to the valve seat 3 by the adjusting ring 4, only the adjusting ring 4 rotates.

According to the first embodiment, the adjustment ring 4 is held at the adjustment position using the frictional force between the wire 5 and the adjustment ring 4 instead of the set screw, so that the adjustment ring 4 can be adjusted. There is no need to rotate the set screw each time, and the adjustment ring 4 can be held in place again simply by rotating it against frictional force and releasing the adjustment ring 4 after adjustment. Adjustment work for the ring 4 can be performed very easily. Therefore, adjustment ring 4
When adjusting, a tool for rotating the set screw is not required.

Moreover, if the rotation of the adjustment ring 4 is stopped, the adjustment ring 4 can be reliably held at the desired adjustment position without shifting from the adjustment position due to the frictional force acting between the bottom surface of the groove and the wire 5. .

In addition, because the frictional force acts on approximately half of the outer circumferential side surface of the adjusting ring 4, the adjusting ring 4 can be held in a predetermined position without tilting relative to the valve seat 3. In other words, if a position-holding force acts on only one point of the adjusting ring, as with a setscrew, the adjustment ring may be forced to tilt relative to the valve seat due to the positioning, resulting in an unnecessary gap between the adjusting ring and the valve seat.

Furthermore, since there is no through hole in the casing 1, the fluid blown out from between the valve seat 2 and the valve body 3 will not leak from the through hole, and there is no need to provide a gasket between the through hole and the set screw. Not even, again,
There is no need to install the gasket or replace the gasket when the gasket is damaged.

In the following embodiments, the basic configuration of the safety valve is the same as that in the first embodiment, so the same reference numerals are given and the explanation will be omitted. The wires mentioned above and the wires to be described later may be made of spring steel, which has elasticity itself, or may be made of synthetic resin or the like to have elasticity due to its structure, or may have no elasticity at all. Needless to say, a cord-like member without the above-mentioned structure may also be used.

<<Second Example>> Next, as shown in FIGS. 3 and 4, in the second example, a substantially Ω-shaped metal wire 7 is used as the wire,
The wire 7 is fitted into the groove 4a of the adjustment ring 4. One end of this wire 7 is bent downward in the axial direction of the adjustment ring, and the bent end 7a is fitted into the hole 3a of the valve seat 3 and fixed. On the other hand, the other end of the wire 7 is fitted into the groove 4a over almost the entire circumference up to the vicinity of the one end, and then is slightly protruded outward from the groove 4a. Thereby, a frictional force is exerted over a wide range between the wire 7 and the groove 4a, and the adjustment ring 4 is held at a predetermined position.

The effects of the second embodiment are basically the same as those of the first embodiment, but compared to the first embodiment, the wire 7 is fitted around almost the entire circumference of the groove 4a. A larger frictional force acts on the adjustment ring 4, and the adjustment ring 4 can be held in position relative to the valve seat 3 more stably.

<<Third Example>> As shown in FIGS. 5 and 6, in the third example, a short metal or synthetic resin wire 8 is used as the wire.
At the same time, a groove 4b is formed in the center of the inner peripheral side of the adjustment ring 4 over the entire circumference, and a groove 4b is formed at two locations on the bottom surface of the groove at a predetermined interval to penetrate through the adjustment ring 4. Holes 4c, 4c are formed. One end 8a of the wire 8 projects outward from the adjustment ring 4 from the one through hole 4c, and the protruding end is crimped against the outer circumferential surface of the adjustment ring, while the other end 8b It protrudes outward from the other through hole 4c, and a screw is formed in the protruding portion so that the nut 9 is screwed into it. Therefore, the wire 8 is fitted into a portion of the groove 4b, that is, about a quarter of the groove 4b, and the one end 8a is caulked and locked onto the outer peripheral side of the adjustment ring 4. On the other hand, the other end 8b is attached to the nut 9 on the outer peripheral side surface at a predetermined distance from the crimping position.
It is tightened and locked. The above wire 8
contacts the upper part of the outer circumferential surface of the valve seat 3 which is threadedly engaged with the inner circumferential surface of the adjustment ring 4, and generates a frictional force between the wire 8 and the outer circumferential surface of the valve seat to move the adjustment ring 4 into a predetermined position. to hold.

In the third embodiment, the concave groove 4b is not formed around the entire circumference of the adjustment ring 4, and the wire 8
It may also be partially formed only in the portion where it fits.

According to the third embodiment, the adjustment ring 4 is held at the adjustment position using the frictional force acting between the wire 5 and the adjustment ring 4 instead of the set screw, so the adjustment ring 4 can be adjusted. There is no need to rotate the set screw each time the adjustment ring 4 is adjusted, and the adjustment ring 4 can be held in the specified position again by simply rotating the adjustment ring 4 against frictional force and releasing the adjustment ring 4 after adjustment. Adjustment work of the adjustment ring 4 can be performed very easily. Therefore, when adjusting the adjustment ring 4, a tool for rotating the set screw is not required.

Furthermore, if the rotation of the adjustment ring 4 is stopped, the friction force acting between the bottom surface of the concave groove and the wire 5 ensures that the adjustment ring 4 is held at the desired adjustment position without shifting from the adjustment position. can.

In addition, the above frictional force is approximately one quarter of that of the adjustment ring 4.
Therefore, the adjustment ring 4 can be held at a predetermined position without any force, without causing the adjustment ring 4 to tilt with respect to the valve seat 3. In other words, if a position holding force acts only on one point of the adjustment ring, such as with a set screw, the adjustment ring will be forced to tilt relative to the valve seat due to the position holding force, creating an unnecessary gap between the adjustment ring and the valve seat. There were some things that happened.

Further, since the wire 8 is tightened and fixed by the adjustment ring 4, even if high pressure is applied to the wire 8 by pressurized fluid, the wire 8 will not vibrate within the groove 4b, and vibration noise will not be generated. It can be effectively prevented.

Furthermore, since there is no through hole in the casing 1, the fluid blown out from between the valve seat 2 and the valve body 3 will not leak from the through hole, and there is no need to provide a gasket between the through hole and the set screw. Not even, again,
There is no need to install the gasket or replace the gasket when the gasket is damaged.

[Brief explanation of the drawing]

Figures 1 and 2 are a cross-sectional view of the main parts of a safety valve according to the first embodiment of the present invention, and a plan view of the main parts showing the relationship between the adjustment ring and the wire, and Figures 3 and 4 are respectively the second embodiment of the present invention. FIGS. 5 and 6 are a sectional view of the main parts of the safety valve according to the third embodiment of the present invention and a plan view of the main parts showing the relationship between the adjustment ring and the wire, respectively. FIG. 7 is a plan view of the main part showing the relationship with the wire, and a sectional view of the main part of a conventional safety valve. 2... Valve body, 3... Valve seat, 3a... Hole, 4...
... Adjustment ring, 4a, 4b ... Concave groove, 4c ... Through hole, 5 ... Wire, 5a ... Curved part, 6 ... Pin, 7 ... Wire spring, 7a, 7b ... Both ends, 7c
... Locking part, 8 ... Wire, 8a ... One end, 8
b...Other end, 9...nut.

Claims (1)

[Claims for Utility Model Registration] (1) A valve seat 3, a valve body 2 that approaches and separates from the valve seat 3, and an adjustment ring 4 that is screwed onto the outer circumferential surface of the valve seat 3 and can rotate in forward and reverse directions. In the safety valve, grooves 4a and 4b extending in the circumferential direction are formed on the circumferential side of the adjustment ring 4, and the grooves 4a and 4
The wire rods 6, 7, 8 that contact the bottom surface of the groove are fitted into the groove b, and the wire rods 6, 7, 8 are fitted between the adjustment ring 4 and the wire rods 6, 7, 8 and the valve seat 3. A safety valve characterized in that the adjustment ring 4 is held in a predetermined position relative to the valve seat 3 by a frictional force acting between the adjustment ring 4 and the valve seat 3. (2) The groove 4a is formed on the entire outer circumference of the adjustment ring 4, and the wire rods 6, 7
has a length dimension that can fit over at least half the circumference of the concave groove 4a of the adjustment ring 4, and
The safety valve according to claim 1, wherein a portion of the wire rods 6, 7 is fixed to the valve seat 3. (3) The groove 4b is formed on the inner circumferential side of the adjustment ring 4, and through holes 4c penetrate from the inner circumferential side to the outer circumferential side of the adjusting ring 4 at both ends of the groove 4b. , 4c, and the wire rod 8 is fitted into the groove 4b and comes into contact with the outer peripheral side surface of the valve seat, which is opposite to the inner peripheral side surface of the adjustment ring, and both ends 8a, 8b of the wire rod 8 are formed. The safety valve according to claim 1, which is a registered utility model, is configured to project outward from the through holes 4c, 4c, respectively, and to be engaged with the adjustment ring 4.