JP2013097712A - Pressure reduction valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pressure reduction valve which has a reduced number of components and is miniaturized by simplifying a structure of a blow valve mechanism.SOLUTION: A blow valve mechanism 41 includes: a piston 42 concentrically disposed on the outer peripheral side of a shaft 23; an inner peripheral-side seal member 43 and an outer peripheral-side seal member 44 disposed on the inner peripheral side and the outer peripheral side of the piston 42; and a return spring. A notch groove serving as a primary pressure open flow passage is provided on the outer peripheral surface of the piston 42. When a pressure reduction valve 1 is opened, the notch groove does not reach the secondary side of the outer peripheral-side seal member 44 and the blow valve mechanism 41 is closed. When the pressure reduction valve is closed and an inflow-side primary pressure is lower than a prescribed value, the notch groove does not reach the secondary side of the outer peripheral-side seal member 44 and the blow valve mechanism 41 is closed. When the inflow-side primary pressure reaches the prescribed value, the piston 42 is stroked to the shaft 23, and the notch groove reaches the secondary side of the outer peripheral-side seal member 44, and the blow valve mechanism 41 is opened.

Description

  The present invention relates to a pressure reducing valve which is a kind of valve device, and more particularly to a pressure reducing valve suitable for use in a water supply pipe. The pressure reducing valve of the present invention is used for, for example, a water supply pipe in an electric water heater, or other equipment that requires a water pressure reducing valve.

Conventionally, a pressure reducing valve 51 shown in FIG. 5 has been known (see Patent Document 1), and this pressure reducing valve 51 is a pressure reducing valve used in a water supply pipe, and the outlet side secondary pressure P _{2 of the} pressure reducing valve 51. And a shaft 54 that moves the valve body portion 55 toward and away from the valve seat portion 56 by reciprocatingly connected to a diaphragm 53 that operates to obtain an equilibrium point between the spring load of the spring 52 disposed so as to oppose it. Have. The operation, the outflow-side secondary pressure P ₂ when pressure by the diaphragm 53 against the load of the spring 52 that urges the diaphragm 53, the shaft 54 and the valve body portion 55 which is connected to the diaphragm 53 in the valve closing direction It lifts, that is, the valve body part 55 moves in a direction approaching the valve seat part 56. Since the valve body 55 to block the seated on the outflow side secondary pressure P ₂ reaches a predetermined value the valve seat 56 to close the valve hole 57 the flow channel, the outlet-side secondary pressure P ₂ less than a certain value It is possible to reduce the pressure.

Further, the pressure reducing valve 51 in FIG. 5 is opened when the pressure reducing valve 51 is closed, and the inflow side primary pressure P ₁ is opened when the inflow side primary pressure P ₁ reaches a predetermined value. A blow valve mechanism 58 having a check valve structure is provided. The operation of the blow valve mechanism 58, if after the valve body 55 blocks the occluded flow path the valve hole 57 is seated on the valve seat portion 56, which further inflow side primary pressure P ₁ increases, the resin The blow valve mechanism 58 is opened at the inflow side primary pressure P ₁ lower than the pressure resistance value of the valve body 59 made of the product, and the pressure is lowered. Thus is it possible to prevent the valve body 59 by the inlet-side primary pressure P ₁ of the high pressure may be damaged.

  However, as shown in the pressure reducing valve 51 of FIG. 5, the check valve structure blow valve mechanism 58 includes a unique valve case 58a, piston 58b, valve body 58c and return spring 58d in parallel with the shaft 54. It is incorporated in the valve body 59. Therefore, there are inconveniences that the number of parts is large, and there is an inconvenience that the pressure reducing valve 51 as a whole must be enlarged.

JP 2008-186106 A

  In view of the above, the present invention provides a pressure reducing valve having a blow valve mechanism that simplifies the structure of the blow valve mechanism, thereby reducing the number of parts and reducing the size of the valve. Objective.

  In order to achieve the above object, a pressure reducing valve according to the present invention is a pressure reducing valve used in a water supply pipe, and is a balance point between an outlet side secondary pressure of the pressure reducing valve and a spring load of a spring arranged to counter this. A shaft that is connected to a diaphragm that operates to reciprocate to move the valve body portion toward and away from the valve seat portion, and the inflow-side primary pressure becomes a predetermined value when the pressure reducing valve is closed. In the pressure reducing valve in which a blow valve mechanism that opens when opened and opens the primary pressure on the inflow side to the secondary side is incorporated in the pressure reducing valve, the blow valve mechanism is coaxial with the outer peripheral side of the shaft. A cylindrical piston disposed above, an inner circumferential seal member disposed on the inner circumferential side of the piston for sealing between the piston and the shaft, and held on the valve housing on the outer circumferential side of the piston, An outer peripheral side sealing member that seals between the valve housing and the valve housing, and a return spring that returns the piston, and the outer peripheral surface of the piston is provided with a notch groove that acts as a primary pressure release channel, When the pressure reducing valve is opened, the notch groove does not reach the secondary side of the outer peripheral side sealing member, and the blow valve mechanism is closed, and when the pressure reducing valve is closed, the inflow side 1 Even when the secondary pressure is less than a predetermined value, the notch groove does not reach the secondary side of the outer peripheral side seal member, the blow valve mechanism is closed, and the inflow side primary pressure reaches the predetermined value. When the piston is stroked with respect to the shaft, the notch groove reaches the secondary side of the outer peripheral side sealing member, and the primary side and the secondary side of the outer peripheral side sealing member are communicated with each other. Blow valve mechanism Characterized by valve-opening.

  In the pressure reducing valve of the present invention having the above configuration, with respect to the structure of the blow valve mechanism, a cylindrical piston is coaxially disposed on the outer peripheral side of the shaft, and an inner peripheral side seal member is disposed on the inner peripheral side of the piston, An outer peripheral seal member is disposed on the outer peripheral side of the piston in a form held by the valve housing. Further, a return spring for returning the piston is provided, and a notch groove serving as a primary pressure release channel is provided on the outer peripheral surface of the piston.

The notch groove provided on the outer peripheral surface of the piston is formed by the movement of the diaphragm and the shaft (displacement) accompanying the fluctuation of the secondary pressure on the outflow side and the stroke of the piston relative to the shaft accompanying the fluctuation of the primary pressure on the inflow side. The relative position with respect to the outer peripheral side sealing member held by the is changed as follows.
(A) When the pressure reducing valve is opened, the notch groove does not reach the secondary side of the outer peripheral side seal member. Therefore, the primary side and the secondary side of the outer peripheral side sealing member are not in communication, and the blow valve mechanism is closed.
(B) The notch groove does not reach the secondary side of the outer peripheral side seal member even when the pressure reducing valve is closed and the inflow side primary pressure is less than a predetermined value. Therefore, the primary side and the secondary side of the outer peripheral side sealing member are not in communication, and the blow valve mechanism is closed.
(C) When the pressure reducing valve is closed and the inflow side primary pressure reaches a predetermined value, the piston strokes against the shaft against the load of the return spring, and the notch groove is formed on the outer side seal member 2. Reach the next side. Therefore, the primary side and the secondary side of the outer peripheral side sealing member communicate with each other through the notch groove, and the blow valve mechanism is opened.

  The pressure reducing valve of the present invention opens the high pressure inflow side primary pressure to the secondary side by using the notch groove provided in the outer peripheral surface of the piston in this way as a pressure release channel.

  Regarding the number of parts, the following can be said.

  That is, in the prior art of FIG. 5, the blow valve mechanism 58 having the check valve structure includes the unique case 58a, the piston 58b, the valve body 58c, and the return spring 58d as described above. Further, as shown in the figure, a seal member 60 for sealing between the shaft 54 and the valve body 59 is provided on the outer peripheral side of the shaft 54. Therefore, the number of parts to be compared is “5”.

  On the other hand, in the pressure reducing valve of the present invention, the blow valve mechanism includes the cylindrical piston, the inner peripheral side seal member, the outer peripheral side seal member, and the return spring as described above. Therefore, the number of parts to be compared is “4”, and the number of parts can be reduced by minus 1 as compared with the prior art.

  In the prior art shown in FIG. 5, the check valve structure blow valve mechanism 58 is incorporated in the valve body 59 in parallel with the shaft 54, so that a large dedicated (occupied) space is required. In this pressure reducing valve, since the blow valve mechanism is coaxially arranged on the outer peripheral side of the shaft, the blow valve mechanism can be incorporated by setting the shaft hole one size larger.

  Therefore, as described above, according to the intended purpose of the present invention, it is possible to provide a pressure reducing valve that simplifies the structure of the blow valve mechanism, thereby realizing both the reduction in the number of parts and the miniaturization of the valve.

Sectional drawing which shows the valve open state of the pressure reducing valve which concerns on the Example of this invention. 1 is an enlarged view of the main part of FIG. Sectional drawing which shows the state at the time of the valve closing state of the pressure reducing valve and the blow valve mechanism being closed Sectional drawing which shows the state at the time of the valve closing state of the pressure reducing valve and the blow valve mechanism opening Sectional drawing which shows the valve open state of the pressure reducing valve which concerns on a prior art example

The present invention includes the following embodiments.
(1) In order to solve the above problems, a pressure reducing valve is characterized in that a blow valve structure is provided in a component of the pressure reducing valve. As a structure, a piston is provided between the shaft and the sliding seal part. When the primary pressure rises beyond the appropriate range when the main valve part of the pressure reducing valve is closed, it is provided between the shaft and the sliding seal part. The piston is opened, and the primary pressure is released to the secondary side, whereby the pressure can be reduced. Further, since the piston and the shaft are always sealed, the pressure receiving area can be adjusted by the conventional sliding seal portion of the pressure reducing valve and the seal diameter between the piston and the shaft during operation.
(2) According to the above configuration, the following effects are exhibited.
Downsizing of the pressure reducing valve: Since the blow valve portion of the pressure reducing valve can be provided in the existing pressure reducing shaft, the equipment can be downsized.
Reduction in the number of parts and the cost merit associated therewith. Since the existing sliding seal part and shaft are used without providing the second valve body, the number of parts can be reduced.

  Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a cross-sectional view of a pressure reducing valve 1 according to an embodiment of the present invention, and an enlarged view of a main part thereof is shown in FIG. Pressure reducing valve 1 according to this embodiment is used for the water supply pipe in an electric water heater, there is the water supply pressure is always adjusted the outflow side secondary pressure P ₂ to be constant, it is configured as follows ing.

  That is, first, a valve housing 2 of the pressure reducing valve 1 is provided by combining a body (valve body) 3, a cover (valve cover) 4 and a lid (lid member) 5 in a watertight manner. 2, operating parts such as a diaphragm 21, a spring (pressure reducing valve spring) 22, a shaft 23, and a valve body portion 27 are incorporated. The body 3 is made of resin, and is provided with a shaft insertion hole (shaft hole) 6 through which the shaft 23 is inserted, and is provided with an inflow side primary port 7 and an outflow side secondary port 8. , 8 communicate with each other through a primary side flow path 9, a valve hole 10, a valve chamber 11, and a secondary side flow path 12. The shaft insertion hole 6 opens to the primary flow path 9 at one end (lower end), and opens to the diaphragm chamber 13 in the cover 4 at the other end (upper end). The valve hole 10 is arranged coaxially with the shaft insertion hole 6. A valve seat portion 14 is provided toward the valve chamber 11 (downward) on the valve chamber 11 side opening peripheral portion of the valve hole 10. The secondary channel 12 communicates with the diaphragm chamber 13 through the communication hole 15.

In the diaphragm chamber 13, a diaphragm 21 is installed between the body 3 and the cover 4. Placed seeking equilibrium loose ends axial direction (vertical direction in the plane center of the spring load of the spring 22 so as to oppose the diaphragm 21 and the outflow-side secondary pressure P ₂ of the pressure reducing valve 1 to ) And one end (upper end) of the shaft 23 is connected to the free end of the diaphragm 21 using a diaphragm retainer (plate) 24, a spring retainer (plate) 25, and a nut 26. The valve body 27, which is a combination of the valve body 28 and the valve body cover 29, is connected to the other end (lower end) of the shaft 23 using a nut 30. The shaft 23 connected to the diaphragm 21 is inserted into the shaft insertion hole 6 and the valve hole 10, and the other end portion of the shaft 23 and the valve body portion 27 are disposed in the valve chamber 11. On the other hand, the spring 22 is elastically interposed between the adjustment screw 31 screwed into the cover 4 and the spring retainer 25, and the spring load can be adjusted by adjusting the screwing amount of the adjustment screw 31. ing.

Therefore in the structure described so far, when the pressure reducing valve 1 outlet side secondary pressure P ₂ is connected to the water supply pipe in the electric water heater is applied to the diaphragm 21, against the spring load of the spring 22 for urging the diaphragm 21 Thus, the shaft 23 and the valve body portion 27 connected to the diaphragm 21 are lifted in the valve closing direction, and the valve body portion 27 moves in a direction approaching the valve seat portion 14. The valve body 27 when the outflow side secondary pressure P ₂ is increased is moved in a direction further closer to the valve seat 14, the valve body 27 when the outflow side secondary pressure P ₂ on the opposite descends from the valve seat 14 Move away. Since the valve body 27 to block the flow path 9, 12 to close the valve hole 10 is seated on the outlet side secondary pressure when the P ₂ reaches a predetermined value x valve seat 14, the outlet-side secondary pressure P ₂ Can be reduced to a certain value x or less.

Further, the pressure reducing valve 1 is opened when the pressure reducing valve 1 is closed when the inflow side primary pressure P ₁ reaches a predetermined value y, and the inflow side primary pressure P ₁ is opened to the secondary side. A blow valve mechanism 41 is provided.

  The blow valve mechanism 41 is configured as follows.

  That is, as shown in FIG. 2, a cylindrical piston 42 is coaxially disposed on the outer peripheral side of the shaft 23, and an inner peripheral side seal member 43 is disposed on the inner peripheral side of the piston 42, so that the space between the piston 42 and the shaft 23 is The outer peripheral side sealing member 44 is disposed on the outer peripheral side of the piston 42 so as to be held by the body 3 of the valve housing 2 to seal between the piston 42 and the body 3 of the valve housing 2. Further, a return spring (blow spring) 45 for returning the piston 42 is provided, and a notch groove 46 serving as a primary pressure release channel is provided on the outer peripheral surface of the piston 42.

  The details of each part are as follows.

  The piston 42 is formed in a cylindrical shape, and is disposed on the outer peripheral side of the shaft 23 so as to be axially movable between the shaft 23 and the body 3 in the valve housing 2. The piston 42 can move in the axial direction with respect to the body 3, and can also move in the axial direction with respect to the shaft 23. In addition, the piston 42 has a position where an inward flange portion 42 a provided on the inner peripheral surface thereof engages with an outward flange portion 23 a provided on the outer peripheral surface of the shaft 23 in the axial direction as an initial movement position of the stroke with respect to the shaft 23. A return spring 45 is interposed between the inward flange portion 42 a and the diaphragm retainer 24.

  The inner peripheral seal member 43 is mounted in a mounting groove 23b provided on the outer peripheral surface of the outward flange portion 23a of the shaft 23, and the outer peripheral surface thereof is slidably in close contact with the inner peripheral surface of the piston 42. The inner peripheral side seal member 43 is configured by an O-ring.

  The outer peripheral side seal member 44 is mounted in a mounting groove 3 a provided on the inner peripheral surface of the shaft insertion hole 6 in the body 3 of the valve housing 2, and the inner peripheral surface thereof is slidably brought into close contact with the outer peripheral surface of the piston 42. Yes. In order to facilitate the mounting of the seal member 44, the mounting groove 3a is formed by a combination of the body 3 and the seal presser 16 fitted thereto. The outer peripheral side sealing member 44 is formed of a lip packing such as a Y packing, a V packing, or a U packing, and these lip ends are directed toward the primary side (downward in the drawing).

  The notch groove 46 is formed as a groove extending in the axial direction on the outer peripheral surface of the piston 42, and is provided on one or more places on the circumference of the outer peripheral surface of the piston 42. The notch groove 46 is provided over a predetermined height range from the primary end (lower end) of the piston 42. Therefore, the primary side end (lower end) 46a of the notch groove 46 opens to the primary end (lower end) of the piston 42, while the secondary end (upper end) of the notch groove 46 is opened. Part) 46b has a tip-end shape.

Notched groove 46 provided on the outer peripheral surface of the piston 42, with the movement (displacement) and fluctuations in the inflow-side primary pressure P ₁ of the diaphragm 21 and the shaft 23 caused by the variation of the outflow-side secondary pressure P ₂ shaft The relative position of the outer peripheral side sealing member 44 held by the body 3 of the valve housing 2 is changed as follows by the stroke of the piston 42 with respect to 23.

(A) when the valve opening time of the outlet-side secondary pressure P ₂ of the pressure reducing valve is less than a certain value, the pressure reducing valve 1 as shown in FIGS. 1 and 2 is opened, i.e. the valve body 27 The piston 23 is located at a position far from the valve seat 14, the shaft 23 is relatively lowered, and the piston 42 has an inward flange 42 a provided on the inner peripheral surface thereof, and an outward flange portion provided on the outer peripheral surface of the shaft 23. It is in contact with 23 a and is in the initial movement position of the stroke relative to the shaft 23. At this time, as shown in FIG. 2, the notch groove 46 has a secondary side end (upper end) 46 b that does not reach the secondary side space 44 a of the outer peripheral side seal member 44. Here, the secondary side space 44a of the outer peripheral side seal member 44 refers to the lip back side space in the outer peripheral side seal member 44, and this space 44a is the gap c between the piston 42 and the seal retainer 16, the diaphragm chamber 13 and the like. The secondary port 8 communicates with the secondary hole 8 via the communication hole 15 and the secondary flow path 12. Therefore, the primary side flow path 9 and the secondary side space 44a of the outer peripheral side seal member 44 are not communicated with each other while being blocked by the outer peripheral side seal member 44, and therefore the blow valve mechanism 41 is closed. Yes.

(B) the outflow-side secondary pressure P ₂ from the state of (a) above when the inflow side primary pressure a valve closing the pressure reducing valve is less than the predetermined value is increased to reach a predetermined value x the pressure reducing valve 1 is closed, this minute, but the shaft 23 is moved toward the direction of the diaphragm chamber 13 (upward), thus the inflow side primary pressure P ₁ be closed or moved is less than the predetermined value y In some cases, as shown in FIG. 3, the piston 42 has not yet made a stroke with respect to the shaft 23, and the notch groove 46 has its secondary side end (upper end) 46 b in the secondary side space 44 a of the outer peripheral side seal member 44. Not reached. Therefore, the primary side flow path 9 and the secondary side space 44a of the outer peripheral side seal member 44 are not communicated with each other while being blocked by the outer peripheral side seal member 44, so that the blow valve mechanism 41 is still closed. ing.

(C) the inflow side primary pressure a valve closing the pressure reducing valve inlet side primary pressure P ₁ from the state of (b) above when it reaches a predetermined value reaches the predetermined value y, 4 Thus, the piston 42 strokes the shaft 23 in the direction of the diaphragm chamber 13 (upward) while compressing and compressing the return spring 45 against the elasticity of the return spring 45, and the notch groove 46 has its secondary side end (upper end). The secondary space 44a of the outer peripheral side seal member 44 is reached at 46b. Therefore, the primary side flow path 9 and the secondary side space 44a of the outer peripheral side seal member 44 communicate with each other through the notch groove 46, and the blow valve mechanism 41 is opened. And through this way blow valve mechanism 41 is opened, the inflow-side primary pressure P ₁ is notched groove 46, the gap c between the secondary side space 44a and the piston 42 and the seal retainer 16 of the outer peripheral side sealing member 44 Then, it is discharged to the diaphragm chamber 13 and further discharged to the outside of the valve via the communication hole 15, the secondary side flow path 12 and the secondary side port 8. Therefore, it is possible to prevent the body 3 from being damaged by opening the blow valve mechanism 41 with the inflow side primary pressure P ₁ lower than the pressure resistance value of the resin body 3 and releasing the high pressure. When the piston 42 is stroked with respect to the shaft 23, the inward flange portion 42a provided on the piston 42 is separated from the outward flange portion 23a provided on the shaft 23 in a predetermined distance L-axis direction. It will be said.

When and (d) is subsequently released inflow side primary pressure P ₁ by the (c) becomes less than a predetermined value y, in the form of a piston 42 is returned by the elasticity of the return spring 45, in FIG. 3 from the state of FIG state Return to. Accordingly, the blow valve mechanism 41 is closed again.

  In the pressure reducing valve 1 having the above configuration, as described above, the number of parts to be compared is “4” including the cylindrical piston 42, the inner peripheral side seal member 43, the outer peripheral side seal member 44, and the return spring 45. Thus, the number of parts is reduced by minus 1, compared with the conventional case. Further, since the blow valve mechanism 41 is arranged coaxially on the outer peripheral side of the shaft 23, it is possible to incorporate the blow valve mechanism 41 only by slightly expanding the shaft insertion hole 6. Therefore, the pressure reducing valve 1 that simplifies the structure of the blow valve mechanism 41, reduces the number of parts, and reduces the size of the valve can be provided.

DESCRIPTION OF SYMBOLS 1 Pressure reducing valve 2 Valve housing 3 Body 3a, 23b Mounting groove 4 Cover 5 Cover 6 Shaft insertion hole 7 Primary side port 8 Secondary side port 9 Primary side flow path 10 Valve hole 11 Valve chamber 12 Secondary side flow path 13 Diaphragm chamber 14 Valve seat portion 15 Communication hole 16 Seal retainer 21 Diaphragm 22 Spring 23 Shaft 23a Outward flange 24 Diaphragm retainer 25 Spring retainer 26, 30 Nut 27 Valve body portion 28 Valve body 29 Valve body cover 31 Adjustment screw 41 Blow valve Mechanism 42 Piston 42a Inward flange part 43 Inner peripheral side seal member 44 Outer peripheral side seal member 44a Secondary side space 45 Return spring 46 Notch groove 46a Primary side end part 46b Secondary side end part c Radial gap

Claims (1)

A pressure reducing valve used in a water supply pipe, reciprocatingly connected to a diaphragm that operates to obtain an equilibrium point between a secondary pressure on the outflow side of the pressure reducing valve and a spring load of a spring arranged to counter the secondary pressure. Has a shaft for moving the valve body portion toward and away from the valve seat portion, and further opens the inflow side primary pressure when the inflow side primary pressure reaches a predetermined value when the pressure reducing valve is closed. In a pressure reducing valve in which a blow valve mechanism for opening the valve to the secondary side is incorporated in the pressure reducing valve,
The blow valve mechanism includes a cylindrical piston coaxially disposed on the outer peripheral side of the shaft, an inner peripheral seal member that is disposed on the inner peripheral side of the piston and seals between the piston and the shaft, An outer peripheral side sealing member that is held by the valve housing on the outer peripheral side of the piston and seals between the piston and the valve housing, and a return spring that returns the piston, and releases the primary pressure on the outer peripheral surface of the piston Notched grooves that act as flow paths are provided,
When the pressure reducing valve is opened, the notch groove does not reach the secondary side of the outer peripheral side seal member, and the blow valve mechanism is closed,
Even when the pressure reducing valve is closed and the inflow side primary pressure is less than a predetermined value, the notch groove does not reach the secondary side of the outer peripheral side seal member and the blow valve mechanism is closed. And
When the inflow side primary pressure reaches a predetermined value, the piston strokes with respect to the shaft and the notch groove reaches the secondary side of the outer peripheral side seal member, and the primary side of the outer peripheral side seal member The pressure reducing valve is characterized in that the blow valve mechanism is opened by connecting the secondary side and the secondary side.

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