JPH0381165B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pressure reducing valve, and more particularly, the present invention relates to a pressure reducing valve, and more particularly to a pressure reducing valve that reduces cracking pressure on a seated portion of a valve body that functions to reduce primary side pressure to a predetermined value, thereby increasing relief sensitivity. The present invention relates to a pressure reducing valve configured to further improve the pressure.

BACKGROUND ART In fluid equipment, such as pneumatic equipment, pressure reducing valves have conventionally been used to reduce the outlet side pressure to a lower set pressure regardless of the flow rate or the inlet side pressure.

Conventionally, in this type of pressure reducing valve, a valve element biased by one coil spring is seated inside a cylindrical body, and this valve element is pressed by a rod displaced by the other coil spring, and the valve element is pressed by a rod displaced by the other coil spring. Controlling the amount of fluid led out to the secondary side through an adjustable gap between the valve body and the seating part, thereby taking out the pressure fluid to the secondary side with the pressure reduced to a constant level. It is configured as follows. Moreover, in this case,
When the secondary side pressure is about to increase rapidly, the valve body is seated on the seating portion, and the rod is separated from the valve body against the elastic force of the other coil spring. This increased pressure fluid is typically configured to escape via a passage opened by the pump.

However, according to this type of prior art pressure reducing valve, the variable distance between the valve body and the seating portion is determined by a sliding member including one coil spring that presses the valve body and a rod for the valve body. This depends on the difference in elastic force between the coil spring and the other coil spring for displacement, and therefore, the cracking pressure on the seating portion of the valve body also depends on the elastic force between the one coil spring and the other coil spring. It depends on your choice. That is, if a coil spring with a relatively strong elastic force is selected as one of the coil springs for pressing the valve body, the cracking pressure of the valve body against the seating part increases significantly, and correspondingly, the cracking pressure of the valve body against the seating part increases. The elastic force of the other coil spring that separates the valve body also inevitably becomes stronger. As a result, when trying to perform a relief action in response to fluctuations in the secondary pressure, the secondary pressure fluid that has increased due to the strong elastic force of the other second coil spring escapes to the outside. It becomes difficult to open a passage for this, which ultimately worsens the degree of relief reduction. Furthermore, if the sliding resistance between the sliding member moved by the other coil spring and the inner circumferential wall of the pressure reducing valve is large, the elastic force of one coil spring will further increase and the other coil spring will move. must be configured to react easily, which further increases the cracking pressure.

The present invention has been made in order to overcome all of the above-mentioned problems, and has a rod extending from a valve body configured to be pressed by a first coil spring and seated on a seating portion, and facing the rod. and a third sliding member for pressing the sliding member in the same direction as the first coil spring pressing the valve body. A coil spring is interposed between the first coil spring and the second coil spring so that the direct elastic forces of the first coil spring and the second coil spring do not reach the valve body, thereby reducing cracking pressure on the seating portion of the valve body. In addition, the sliding member is separated from the rod integrally formed with the valve body under the action of the second coil spring and the third coil spring, thereby opening the valve. It is an object of the present invention to provide a pressure reducing valve that allows the increased pressure fluid to escape suitably to the outside of the pressure reducing valve body from a secondary side fluid pressure escape passage.

In order to achieve the above object, the present invention includes a first coil spring that pushes a valve body extending from a rod toward a seating part, and a knob member whose elastic force is adjusted to push the valve body. a second coil spring for separating the body from the seating portion; a sliding member with which one end of the second coil spring is elastically pressed into contact with and can freely come into contact with and separate from the rod; and the sliding member. When the pressure on the secondary side fluctuates, the third coil spring is detached from the rod against the elastic force of the second coil spring.
The rod is loosely fitted into the sliding member, and defines a passage through which fluid related to the secondary side pressure escapes to the outside when the sliding member is separated from the rod. It is characterized by being configured as follows.

Next, preferred embodiments of the pressure reducing valve according to the present invention will be described in detail with reference to the accompanying drawings.

1 and 2, reference numeral 10 indicates a pressure reducing valve according to the present invention, and the pressure reducing valve 10 is composed of a pressure reducing valve main body 12 and a pipe joint 14. In the figure, the pipe fitting 14 has a first cylindrical part 16 extending vertically and forming the pressure reducing valve body 12, and a second cylindrical part 18 extending horizontally and substantially forming a pipe fitting mechanism. including. Said first cylindrical part 1
6 and the second cylindrical portion 18 are integrally made of, for example, a relatively hard synthetic resin body. A through hole 20 is defined inside the first cylindrical portion 16 . A coil spring, etc., which will be described later, is incorporated using this through hole 20.

That is, the pressure reducing valve main body 12 has a protrusion 22 exposed outside the through hole 20, and the protrusion 22 is engaged with the first fitting member 24. The first fitting member 24 has a hole 26 formed in its lower central portion;
The protrusion 22 fits into this hole 26 . The protrusion 22 has a screw groove 28 around it, and a passage 30 is defined along the center of the axis.
A coil spring 34 is seated in a recess 32 formed at the end portion of the coil spring 34. That is, the first fitting member 24 defines a chamber 36 in its center.

Next, a coil spring 34 is installed in the chamber 36.
A valve body 38 is disposed which is displaced under the elastic force of. In the figure, a protrusion 40 is provided at the lower part of the valve body 38, and the other end of the coil spring 34 engages with a circumferential step formed by the protrusion 40. In this case, the tapered upper part of the valve body 38 is covered with an elastic body, for example, synthetic rubber 42, to ensure an airtight seating effect on the seating part 44 formed on the upper part of the first fitting member 24.

A bulge 45 is formed above the seating portion 44 of the first fitting member 24 , and one end portion of the coil spring 46 is seated on the outer periphery of the bulge 45 . A passage 48 is defined in the bulging part 45 , and when the valve body 38 is separated from the seating part 44 , the passage 48 opens into the chamber 36 .
It is configured to be in communication with the passage 30 via. On the other hand, the rod 4 is inserted from the upper end of the valve body 38.
9 extends upwardly, and this rod 49 lies on the axis of the coil spring 46. The other end of the coil spring 46 engages with a ring 52 that engages with a sliding member 50 that is disposed in sliding contact with the inside of the through hole 20 . In fact, the sliding member 50 has a bulging thick cylindrical portion 54 formed at its lower end, and the ring 52 is fitted and fixed to a circumferential stepped portion formed at the lower end of the cylindrical portion 54. The cylindrical portion 54 defines a passage 56 into which the rod 49 is loosely fitted. A circumferential groove 58 directed toward the inside of the sliding member 50 is formed around the cylindrical portion 54, and this circumferential groove 58
A seal ring 60 is fitted to the. This seal ring 60 will be explained in more detail in FIG.

As can be easily understood from this figure, the seal ring 60 includes an annular portion 62 that fits and abuts on the outer peripheral wall of the cylindrical portion 54, and a horizontal portion that extends horizontally from the upper end of the annular portion 62 and surrounds the annular portion 62. It consists of a section 64, an annular section 66 that hangs down from the horizontal section 64 and is substantially parallel to the annular section 62, and a sliding contact section 68 that expands from the annular section 66 in a skirt shape. In this case, the sliding contact portion 68 is assembled so that the outer corner portion 68a is in close contact with the inner circumferential wall portion of the first cylindrical portion 16 defining the through hole 20, as shown in FIG.
In the figure, reference numeral 70 indicates an annular groove formed at an acute angle for the sliding contact portion 68 to suitably perform the above-mentioned close action, and reference numeral 72 indicates the outer periphery of the sliding member 50. This is an annular protrusion that protrudes annularly from the end and defines a circumferential groove 58 for accommodating the seal ring 60 .

As described above, the expanding diameter peripheral wall portion of the sliding member 50 is in sliding contact with the inner peripheral wall of the first cylindrical portion 16 defining the through hole 20, and therefore the bending sliding contact of the seal ring 60 is The portion is configured to come into pressure contact with the inner circumferential wall of the first cylindrical portion 16. The sliding member 50 is
As can be easily understood from the figure, the upper end portion is opened along its axis, and a packing 7 made of synthetic resin is provided at the bottom portion where the diameter of the opening hole portion 74 is reduced.
6 and a presser plate 78 are arranged in an overlapping manner.
A through hole 80 is defined in the packing 76 and the presser plate 78, and one end of a coil spring 82 is seated on the presser plate 78. A bushing 86 having a passage 84 is fitted into the upper end of the first cylindrical portion 16 , and a sliding member 88 is slidably disposed inside the hollow interior of the bushing 86 .
The other end of the coil spring 82 is seated on the lower surface of the coil spring 82. A rod 92 is threaded through the bush 86 and is rotated by a knob 90. The tip of the rod 92 has a hemispherical tip 9.
4 is formed, and this tip 94 engages with a curved recess provided in the center of the sliding member 88.

Next, the second cylindrical portion will be explained. The second cylindrical portion 18 has a passage 100 communicating with the passage 48,
This passage 100 is in communication with the hole 102.
The hole 102 is in communication with a hole 104 that expands further. A pipe joint 106 is housed in this hole.

Therefore, the internal structure of this pipe joint 106 will be explained below with reference to FIG. 4. First, a ring-shaped seal member 110 is seated at the bottom of the hole 104. The sealing member 110 has grooves 11 on its circumferential upper and lower end surfaces in order to increase the sealing effect.
2a and 112b are engraved. Seal member 11
0 is preferably made of an elastic material such as natural rubber or synthetic rubber in view of its function.

In the present invention, a chuck member 114 is further suitably used. The chuck member 114 is generally a ring-shaped flat plate made of metal with high elasticity.
A plurality of slits 118 are defined in the main body 116 at equal intervals. A claw portion 120 is formed at one end of the main body 116 by bending it inward.
As can be easily understood from the figure, the claw portion 120 is
It is preferable to sharpen it. A collet 122 fits over the chuck member 114. This collet 122 is also preferably made of a flexible member such as synthetic resin, and like the chuck member 114, a plurality of slits 126 are formed in the ring-shaped main body 124 at equal intervals. One end of the main body 124 is formed with a thickened bulge 128 directed outward, and a ring-shaped flange 1 is formed on the other end.
30 is formed. It will be readily appreciated that the presence of the slit 126 allows the body 124 to flex inwardly or outwardly.

Next, in the present invention, a guide member 132 that fits on the outside of the collet 122 is provided. The guide member 132 has an inwardly extending flange 134 formed at its upper end, and a circular inclined surface 136 having a predetermined angle inward at its lower end. . Furthermore, an annular protrusion 138 is formed on the ring-shaped guide member 132 above the inclined surface 136.

On the other hand, reference numeral 140 indicates a release button. The release bush 140 has a cylindrical shape and has an outwardly extending flange 142 formed at its upper end. Further, the chuck member 1 is attached to the lower end of the release bush 140.
An edge 144 having a gentler inclination angle than the fourteen claws 120 is formed. Release button 14
0 has the edge 1 from the middle of the cylindrical body.
A plurality of slits 146 are formed oriented toward the flange 14 , and the slits 146 and the flange 14
2, a stepped portion 148 is formed by reducing the thickness of the release bush 140.

The pressure reducing valve according to the present invention is basically constructed as described above, and its operation and effects will be explained next.

First, by screwing the knob 90, the rod 92 is displaced relative to the bush 86, and the tip 9
4 is pressed against the curved recess of the sliding member 88. This displacement of the rod 92 displaces the sliding member 88 and achieves the function of increasing the elastic force of the coil spring 82. Therefore, the sliding member 50 is displaced downward according to its elastic force, and presses the coil spring 46 that is attached to the ring 52.
The packing 76 presses against the tip of the rod 49 and displaces it downward in the figure. At this time, the through hole 80 is closed by the tip of the rod 49. As a result of the rod 49 moving downward, the valve body 38 separates from the seating portion 44, ensuring communication between the passage 48 and the chamber 36 at an opening corresponding to the elastic force of the coil spring 82. . As a result, the passage 30 is brought into communication with the pipe fitting 106 via the chamber 36, the spaced apart portion between the valve body 38 and the seating portion 44, the passage 48, the passage 100, and the hole 102.

In such a state, the threaded groove 2 of the protrusion 22
8 into the primary conduit, for example. and,
A pipe body 200 shown in FIG. 4 may be inserted into the pipe joint 106. In this case, the pipe joint 106 is fitted into the hole 104 of the second cylindrical body 18 in advance. That is, the seal member 110 and the chuck member 114 are installed in the hole 104, and the guide member 13 is installed in the collector 122.
2 and a release button 140 are incorporated. The sealing member 110 is thus seated at the end portion of the hole 104, and after the sealing member 110 has been placed and fixed in advance in this way, the chuck member 1
14 and the collet 122 is fitted onto the outside. As a result, the flange 130 of the collet 122 abuts the circumferential upper end of the chuck member 114. In this manner, chuck member 114 and collet 122 engage the upper end of seal member 110 in a unitary configuration. That is, the claw portion 12 that slopes inward
0 engages the curved inner end of seal member 110. Therefore, the guide member 132 is engaged with the hole 104. The metal guide member 132 is introduced into the hole 104, and the annular protrusion 138 is engaged with the peripheral wall defining the hole 104 while the second cylindrical portion 18 is bent.

Then, the release bush 140 is inserted into the guide member 132. As described above, the release button 140 has an edge 144 that forms a gentler inclination angle than the pawl portion 120, so that the release button 140 can be inserted into the chuck member 114 through the guide member 132. Then, the tip of the edge 144 comes into contact with the claw portion 120. In this assembled state, the preparation step is completed, and the tube body 200 is introduced into the release bush 140 and is firmly attached to complete the assembly work.

There, a pressurized fluid, for example pressurized air, is introduced into the chamber 36 from the primary passage 30. This air passes through the narrow passageway between the valve body 38 and the seating portion 44, and is sent to the pipe fitting 106 side via the passageway 48. During this time, the variable gap between the valve body 38 and the seating portion 44 is adjusted by screwing the knob 90 as described above.
The pressure of the air is suitably reduced here because it is adjusted by the adjusting action of the elastic force of the coil spring 82 on the rod 49 integral with the pipe joint 106, and the pressure of the air is lowered to a constant pressure from the pipe joint 106 (not shown). It will be introduced into the actuator. During this time,
The coil spring 46 constantly presses the sliding member 50 upward via the ring 52. Therefore,
Actually, the coil spring 3 that presses the valve body 38
The spring force of 4 is small. That is, the valve body 38
The cracking pressure on the seating portion 44 can be extremely reduced.

By the way, a sudden change in pressure may occur on the secondary side, that is, on the side of the pipe joint 106, and as a result, the secondary side pressure may increase. At this time, the secondary pressure reaches the passage 48 side via the hole 102 and the passage 100. However, in this case, the sliding member 50 is constantly subjected to upward displacement pressure due to the elastic force of the coil spring 46, and furthermore, the sliding member 50 is constantly displaced upwardly by the ring 52, the seal ring 60, etc. The fluid pressure is received and the sliding member 50
is pulled upward against the elastic force of the coil spring 82. Therefore, the packing 76 is attached to the valve body 3.
As a result, the through hole 80 is opened.
On the other hand, when the packing 76 is separated from the rod 49 as described above, the coil spring 34 acts to seat the valve body 38 on the seating part 44 by its elastic force, thereby causing the passage 48 and the chamber 3 Communication with the device is cut off.

Therefore, the fluid related to the increased secondary side pressure is partially transferred to the passage 56 and the through hole 8 with which the rod 49 is related.
0, it will be guided to the outside from the passage 84 via the hole 74. Note that when the sliding member 50 is displaced upward as described above, the corner portion 68a of the seal ring 60 fitted to the sliding member 50 is connected to the inner circumferential wall portion of the first cylindrical portion 16 in a circumferential line shape. They are just touching each other. That is, in the seal ring 60, the skirt-shaped sliding contact portion 68 presses its outer corner portion 68a against the inner circumferential wall portion by line contact under the action of the annular groove 70. Therefore, the sliding member 50 can perform a displacement operation without generating any slight frictional resistance.

As can be easily understood from the above effects,
The cracking pressure exerted by the coil spring 34 on the seat 44 of the valve body 38 is
In particular, due to the presence of the coil spring 46, the elastic force of the coil spring 82 is not affected. That is, since the coil spring 46 functions to counteract the elastic force of the coil spring 82, even if sliding resistance exists between the first cylindrical portion 16 and the sliding member 50, the coil spring 34 There is no need to select a resilient force that directly takes into account this sliding resistance. In the end, since the cracking pressure of the valve body 38 can be reduced,
The sensitivity of this valve body 38 is improved all at once.

As is clear from the above description, the pressure reducing valve according to the present invention includes a pair of coil springs for adjusting the separation distance of the valve element from the seating part, and a coil spring for separating the valve element from the seating part. A different coil spring is inserted which has a resilient force that resists the resilient force of the pressure reducing valve, thereby improving the release sensitivity to achieve the function of the pressure reducing valve. Moreover, it goes without saying that it has the advantage of being able to be manufactured at low cost because of its simple structure.

Although the present invention has been described above with reference to preferred embodiments, the present invention is not limited to these embodiments, and various improvements and changes in design can be made without departing from the gist of the present invention. Of course.

[Brief explanation of drawings]

FIG. 1 is a perspective explanatory view of a pressure reducing valve according to the present invention, FIG. 2 is a vertical cross-sectional explanatory view of the pressure reducing valve shown in FIG. 1, and FIG. 3 is an exploded perspective view of main parts of the pressure reducing valve shown in FIG. FIG. 4 is an exploded perspective longitudinal sectional view of the pressure reducing valve shown in FIGS. 1 and 2, particularly the pipe joint portion. 10... Pressure reducing valve, 12... Pressure reducing valve main body, 14... Pipe joint, 34... Coil spring, 38... Valve body, 44
...Seating portion, 46...Coil spring, 50...Sliding member, 52...Ring, 82...Coil spring.

Claims (1)

[Scope of Claims] 1. A first coil spring that pushes the valve body extending from the rod toward the seating part, and a knob member whose elastic force is adjusted to move the valve body away from the seating part. a second coil spring to be removed; and a second coil spring to be removed.
One end of the coil spring elastically presses against the rod, and the sliding member is able to come into contact with and separate from the rod, and when the pressure on the secondary side changes, the elastic force of the second coil spring is applied to the sliding member. and a third coil spring that detaches from the rod against the pressure, and when the rod is loosely fitted into the sliding member and the sliding member is separated from the rod, the fluid related to the secondary pressure is released. What is claimed is: 1. A pressure reducing valve characterized in that the pressure reducing valve is configured to define a passage through which the water escapes to the outside. 2. The pressure reducing valve according to claim 1, wherein the sliding member includes a seal ring that presses against the inner circumferential wall of the cylindrical portion forming the pressure reducing valve body in a circumferential line. 3. In the pressure reducing valve according to claim 2, the seal ring is formed in the shape of a skirt that is applied with elastic force toward the inner circumferential wall of the cylindrical portion by the annular groove, and the outer corner of the skirt-like body A pressure reducing valve in which a portion is pressed against the inner circumferential wall of the cylindrical portion in a circumferential line shape.