WO2019163879A1

WO2019163879A1 - Pressure reducing valve

Info

Publication number: WO2019163879A1
Application number: PCT/JP2019/006508
Authority: WO
Inventors: 亮平高松; 真行須藤; 智彦村木
Original assignee: 三菱電機株式会社
Priority date: 2018-02-22
Filing date: 2019-02-21
Publication date: 2019-08-29
Also published as: JPWO2019163879A1

Abstract

A pressure reducing valve (1A) is provided with: a housing (10) in which a flow passage (15) is formed; a valve seat (30) formed in the flow passage (15); a valve body (20) capable of coming into contact with the valve seat; an auxiliary spring (40) for urging the valve body (20) in the direction in which the valve body (20) comes into contact with the valve seat (30); a spring (50) for urging the valve body (20) in the direction in which the valve body (20) is separated from the valve seat (30); a diaphragm (60) disposed between the spring (50) and the valve body (20), one surface of the diaphragm (60) being in contact with the spring (50) and being subjected to the urging force of the spring (50), the other surface of the diaphragm (60) being in contact with the portion of the flow passage (15), which is located closer to an outlet (14) than the valve seat (30), and being subjected to the pressure of fluid, the diaphragm (60) being deformed toward the valve body (20) when the urging force of the spring (50) is greater than a force caused by the fluid pressure, thereby separating the valve body (20) from the valve seat (30); and a regulation member (80) held by the housing (10) so as to be movable in the direction in which the spring (50) is compressed or allowed to extend, and regulating the magnitude of the urging force of the spring (50).

Description

Pressure reducing valve

The present invention relates to a pressure reducing valve.

The pressure reducing valve is provided in a flow path connecting the fluid inlet and outlet, and has a valve seat and a valve body, and a spring that urges the valve body in a direction away from the valve seat to open the valve, An auxiliary spring that closes the valve by urging the valve body in a direction to contact the valve seat with a smaller urging force than the spring, and when the fluid pressure on the outflow side increases, it deforms by the fluid pressure and compresses the spring Some of them include a diaphragm that reduces the biasing force of the spring and closes the valve with an auxiliary spring.

For example, Patent Document 1 discloses a pressure reducing valve in which a spring for biasing a valve shaft provided in a valve body and an auxiliary spring are fixed to an upper part and a lower part of a housing.

Japanese Utility Model Publication No. 3-17487

In the pressure reducing valve described in Patent Document 1, since the spring is fixed, the urging force of the spring cannot be adjusted. As a result, the value of fluid pressure at which the valve body closes, that is, the pressure value at which the valve body operates may vary due to variations in the assembly of the spring.

This invention was made in order to solve said subject, and it aims at providing the pressure-reduction valve which can adjust the pressure value which a valve body operate | moves.

In order to achieve the above object, a pressure reducing valve includes a housing in which a flow path connecting an inflow port into which a fluid flows in and an outflow port from which the fluid flows out, a valve seat formed in the flow path, and a valve seat. A contactable valve body, a first elastic member that urges the valve body in a direction to contact the valve seat; A second elastic member having a second elastic member disposed between the second elastic member and the valve body, wherein one surface is in contact with the second elastic member to receive a biasing force of the second elastic member, and the other surface is the flow path. And a diaphragm that receives a fluid pressure of the fluid in contact with a portion closer to the outlet than the valve seat. When the urging force of the second elastic member is larger than the force due to the fluid pressure, the diaphragm deforms toward the valve body and separates the valve body from the valve seat, and the urging force of the second elastic member is larger than the force due to the fluid pressure. When it is small, it is deformed toward the second elastic member, and the valve body is brought into contact with the valve seat by the first elastic member. Furthermore, the pressure reducing valve includes an adjustment member that is held by the housing so as to be movable in a direction in which the second elastic member is compressed or extended, and adjusts the magnitude of the urging force of the second elastic member.

According to the configuration of the present invention, since the adjusting member that adjusts the magnitude of the urging force of the second elastic member is provided, the diaphragm is deformed to the second elastic member side, and the valve body is moved to the valve seat by the first elastic member. The abutting fluid pressure can be changed. As a result, a pressure reducing valve capable of adjusting the pressure value at which the valve element operates can be provided.

1 is a perspective view of a pressure reducing valve according to Embodiment 1 of the present invention. 1 is a perspective view of the pressure reducing valve shown in FIG. 1 cut along the XZ plane. Sectional drawing of the pressure reducing valve which concerns on Embodiment 1 of this invention 1 is an exploded view of a pressure reducing valve according to Embodiment 1 of the present invention. Cross-sectional view of the pressure reducing valve when fluid is supplied and the valve body opens from the valve seat Cross-sectional view of the pressure reducing valve when the fluid pressure rises and the valve body contacts the valve seat and the valve closes Cross section of the pressure reducing valve when the fluid pressure further increases and the relief valve opens A perspective view of a pressure reducing valve according to Embodiment 2 of the present invention. A perspective view of the pressure reducing valve shown in FIG. 8 cut along the XZ plane. Sectional drawing of the pressure reducing valve which concerns on Embodiment 2 of this invention Exploded view of a pressure reducing valve according to Embodiment 2 of the present invention A perspective view of a pressure reducing valve according to Embodiment 3 of the present invention. 12 is a perspective view of the pressure reducing valve shown in FIG. 12 cut along the XZ plane. Sectional drawing of the pressure reducing valve which concerns on Embodiment 3 of this invention. Exploded view of a pressure reducing valve according to Embodiment 3 of the present invention

Hereinafter, a pressure reducing valve according to an embodiment of the present invention will be described in detail with reference to the drawings. In addition, the same code | symbol is attached | subjected to the same or equivalent part in a figure. In the Cartesian coordinate system XYZ shown in the figure, when the inflow port into which the fluid flows is arranged on the left, the horizontal direction is the X axis, the vertical direction is the Z axis, and the direction perpendicular to the X axis and the Z axis is the Y axis. . Hereinafter, this coordinate system will be described as appropriate.

(Embodiment 1)
The pressure reducing valve according to Embodiment 1 is a pressure reducing valve that includes an adjusting member that adjusts the urging force of a spring that opens and closes the valve body. The pressure reducing valve further includes a relief valve. In addition, the pressure reducing valve includes a separation member that can adjust the position at which the valve body separates from the valve seat in order to adjust the opening and closing of the valve body of the relief valve. Hereinafter, the configuration of the pressure reducing valve will be described with reference to FIGS.

FIG. 1 is a perspective view of a pressure reducing valve 1A according to Embodiment 1 of the present invention. FIG. 2 is a perspective view of the pressure reducing valve 1A shown in FIG. 1 cut along the XZ plane. FIG. 3 is a cross-sectional view of the pressure reducing valve 1A. FIG. 4 is an exploded view of the pressure reducing valve 1A.
As shown in FIGS. 1 to 4, the pressure reducing valve 1A includes a casing 10 in which an inlet 13 and an outlet 14 are formed, a valve body 20 disposed in the casing 10, and a valve body 20 A contactable valve seat 30; an auxiliary spring 40 that urges the valve body 20 in a direction to contact the valve seat 30; a spring 50 that urges the valve body 20 in a direction away from the valve seat 30; The diaphragm 60 that is deformed by receiving the fluid pressure of the fluid and compresses or extends the spring 50, the relief valve 70 provided in the diaphragm 60, and the adjustment provided to adjust the compression amount of the spring 50 provided in the housing 10. A member 80 and a relief valve adjusting member 90 for adjusting the relief valve 70 are configured.

The casing 10 is formed with a flow path 15 through which a fluid flows, and a member that accommodates members such as the valve body 20, the auxiliary spring 40, the spring 50, and the diaphragm 60 disposed in the vicinity of the flow path 15. It is. As shown in FIGS. 3 and 4, the housing 10 includes an upper lid 110, a lower lid 120, and a valve housing 130.

As shown in FIG. 4, the upper lid 110 is formed in a shape in which a cylindrical portion 111 and a rectangular parallelepiped portion 112 arranged on the −Z side of the cylindrical portion 111 are combined.

As shown in FIG. 3, a hollow is formed inside the cylindrical portion 111 and the spring 50 is accommodated. An opening for inserting the adjustment member 80 is formed on the + Z side of the cylindrical portion 111 in order to adjust the compression amount of the spring 50. A relief valve adjusting member 90 is inserted into this opening. On the other hand, the −Z side of the cavity of the cylindrical part 111 is continuous with the cavity formed inside the rectangular parallelepiped part 112.

The rectangular parallelepiped portion 112 has a cavity formed therein, like the cylindrical portion 111. The −Z end of the rectangular parallelepiped portion 112 is open. In order to close the opening and compress the spring 50, the diaphragm 60 is fixed to the −Z end of the rectangular parallelepiped portion 112 with the diaphragm 60 oriented parallel to the XY plane. The rectangular parallelepiped portion 112 covers a rectangular parallelepiped portion 131 (to be described later) of the valve casing 130 and closes the + Z side opening of the valve casing 130.

Since the relief valve 70 is provided in the diaphragm 60 in the cavity of the rectangular parallelepiped part 112 and the cavity of the cylindrical part 111 continuous with the cavity, a fluid flows when the relief valve 70 is opened. In order to discharge this fluid, the cylindrical portion 111 is provided with a discharge port 12.

On the other hand, the lower lid 120 is formed in a cylindrical shape as shown in FIG. A recess 122 for accommodating the auxiliary spring 40 is formed on the + Z side of the lower lid 120. As shown in FIG. 3, the auxiliary spring 40 is placed in the recess 122. An O-ring 121 that is a hermetic seal is provided on the outer periphery of the lower lid 120 to prevent fluid leakage. The lower lid 120 is fitted into the opening on the −Z side of the valve housing 130 to close the opening.

As shown in FIG. 4, the valve housing 130 includes a rectangular parallelepiped portion 131 that covers the upper lid 110, and a cylindrical portion that is disposed on the −Z side of the rectangular parallelepiped portion 131 and in which a flow path 15 for flowing fluid and a valve seat 30 are formed. 132 and a cylindrical portion 133 disposed on the −Z side of the cylindrical portion 132 and having the lower lid 120 fitted in the opening of the cylindrical portion.

The rectangular parallelepiped portion 131 is formed with a cavity in order to supply a fluid to the diaphragm 60 provided on the upper lid 110. The + Z end of the rectangular parallelepiped portion 131 is open. As shown in FIG. 3, a rectangular parallelepiped portion 112 of the upper lid 110 is covered with the opening. The diaphragm 60 faces the cavity of the rectangular parallelepiped portion 131 to which the fluid is supplied. Thereby, the fluid pressure of the fluid is applied to the surface of the diaphragm 60 on the side of the rectangular parallelepiped portion 131, that is, the surface on the −Z side.

On the other hand, as shown in FIGS. 2 and 3, the cylindrical portion 132 has a cylindrical axis directed in the X direction. And both ends of the cylinder in the X direction are open. Specifically, the −X end of the cylindrical portion 132 is opened to function as the inflow port 13 into which the fluid flows. The + X end of the cylindrical portion 132 is opened in order to function as the outlet 14 through which the fluid that has flowed in flows out. Thereby, the internal space of the cylindrical portion 132 functions as the flow path 15 through which the fluid flowing in from the inflow port 13 flows.

The cylindrical portion 132 is provided with a partition wall 151 that obliquely crosses the cylindrical axis and partitions the internal space of the cylindrical portion 132. Further, an internal cylinder 152 is provided in which the + Z end is located on the + Z side of the cylindrical portion 132, that is, located in the cavity of the rectangular parallelepiped portion 131, and the -Z end is located in the center of the cylindrical portion 132 in the Z direction. Yes. The + Z end and the −Z end of the inner cylinder 152 are open.

A valve shaft 22 (described later) of the valve body 20 is inserted into the inner cylinder 152. The valve seat 30 is formed at the −Z end of the inner cylinder 152, and the valve body 20 is disposed on the −Z side of the inner cylinder 152. An opening 153 is formed in the cylindrical wall of the inner cylinder 152, and a partition wall 151 is connected to the opening 153. Thus, a flow path 15 is formed in which fluid flows from the inlet 13 to the outlet 14 via the valve body 20 of the inner cylinder 152.

The internal space of the cylindrical portion 132 is connected to the cavity of the rectangular parallelepiped portion 131 described above on the + X side of the internal cylinder 152, that is, on the outlet 14 side. As a result, the fluid on the outlet 14 side is supplied to the cavity of the rectangular parallelepiped portion 131. As a result, the fluid pressure of the fluid is applied to the diaphragm 60. Further, the + Z end of the cylindrical portion 133 with the cylindrical axis directed in the Z direction is connected to the wall portion of the cylindrical portion 132 on the −Z side with respect to the inner cylinder 152.

The -Z end of the cylindrical part 133 is open. A lower lid 120 is fitted into the opening. As described above, the auxiliary spring 40 is placed on the lower lid 120. In the cylindrical portion 133, the auxiliary spring 40 is positioned on the −Z side of the inner cylinder 152 by fitting the lower lid 120. As a result, the auxiliary spring 40 is disposed on the −Z side of the valve body 20 on the −Z side of the inner cylinder 152.

The valve body 20 is formed in a disk shape as shown in FIG. As shown in FIGS. 2 and 3, the outer diameter of the valve body 20 is larger than the inner diameter of the inner cylinder 152 in order to contact the valve seat 30 and close the −Z end of the inner cylinder 152. The valve body 20 is disposed on the + Z side with respect to the auxiliary spring 40. As shown in FIG. 3, the valve body 20 is urged toward the + Z side, that is, in a direction in contact with the valve seat 30 of the inner cylinder 152 by a compressed auxiliary spring 40 described later. Thereby, the valve body 20 can contact the valve seat 30 formed in the inner cylinder 152 to close the flow path 15. An annular sealing material 21 is provided on the + Z surface of the valve body 20 in order to close the flow path 15 in close contact with the valve seat 30.

Further, since the valve body 20 opens the flow path 15 away from the valve seat 30, the valve shaft 22 pushed in the −Z direction by the diaphragm 60 and the inner wall of the inner cylinder 152 when the valve shaft 22 is pushed. And a cylindrical close portion 24 that closely prevents fluid leakage.

The valve shaft 22 extends from the valve body 20 in the + Z direction and to the −Z side of the diaphragm 60. As described above, the valve shaft 22 is inserted through the inner cylinder 152. When the diaphragm 60 is deformed in the −Z direction by a spring 50, which will be described later, the + Z end of the valve shaft 22 is pressed by the diaphragm 60 in the direction of the cylindrical axis of the inner cylinder 152 and in the −Z side, and moved in that direction. . As a result, the valve body 20 is separated from the valve seat 30 of the inner cylinder 152. As a result, the valve body 20 opens the flow path 15.

An O-ring 23 that is a hermetic seal is wound around the outer periphery of the close contact portion 24. As a result, the close contact portion 24 prevents fluid from leaking from between the inner cylinder 152 when the valve shaft 22 is pressed by the diaphragm 60 and moves inside the inner cylinder 152.

On the other hand, the valve seat 30 is formed at the −Z end of the inner cylinder 152 as described above. Although not shown, the valve seat 30 is formed in an annular shape. The outer diameter of the valve seat 30 is smaller than the outer diameter of the valve body 20 so that the valve body 20 can come into contact therewith. Further, the inner diameter of the valve seat 30 is larger than the outer diameter of the valve shaft 22 so that the valve body 20 can be moved in the Z direction. The valve body 20 is pressed against the valve seat 30 by the auxiliary spring 40 as described above.

The auxiliary spring 40 is configured by a coil spring whose natural length is smaller than the distance from the + Z surface of the recess 122 of the lower lid 120 to the −Z surface of the valve seat 30. The auxiliary spring 40 is sandwiched between the + Z surface of the recess 122 of the lower lid 120 and the −Z surface of the valve body 20 and is compressed. Thereby, the auxiliary spring 40 always urges the valve body 20 in the + Z direction, that is, toward the valve seat 30 side of the inner cylinder 152.

On the other hand, the spring 50 is configured by a coil spring placed on the + Z surface of the diaphragm 60 and having a natural length smaller than a distance from a later-described washer 61 to a cylindrical portion 111 cavity + Z end of the upper lid 110. The −Z end of the spring 50 is in contact with the washer 61. The + Z end of the spring 50 is in contact with an adjustment member 80 provided on the cylindrical portion 111 of the upper lid 110. The spring 50 is compressed by being sandwiched between the washer 61 and the adjustment member 80. Thereby, the spring 50 always urges the diaphragm 60 in the −Z direction.

The diaphragm 60 is formed in an annular shape as shown in FIG. Then, as shown in FIG. 3, a cylindrical portion of a relief valve seat 72, which will be described later, of the relief valve 70 is fitted into the annular hole. The flange portion at the −Z end of the relief valve seat 72 is located on the −Z side of the diaphragm 60.

As shown in FIGS. 2 and 3, a washer 61 having an inner diameter equal to the inner diameter of the diaphragm 60 is placed on the + Z surface of the diaphragm 60. As described above, the −Z end of the spring 50 is in contact with the washer 61. As a result, the washer 61 is biased in the −Z direction by the spring 50. As a result, the diaphragm 60 is urged in the −Z direction via the washer 61.

On the other hand, a flange portion of the relief valve seat 72 is disposed on the −Z surface of the diaphragm 60. The relief valve element 71 and the + Z end of the valve shaft 22 are positioned in this order on the −Z side of the relief valve seat 72. When fluid flows into the −Z surface of the diaphragm 60 from the inflow port 13 and flows into the outflow port 14 side, the cavity of the rectangular parallelepiped portion 131 of the valve housing 130 is filled with the fluid, so that the fluid contacts. To do. As a result, the diaphragm 60 is pressurized with fluid pressure.

When the urging force of the spring 50 is smaller than the fluid pressure, the diaphragm 60 is pushed by the urging force of the spring 50 and deforms in a convex shape in the −Z direction. Accordingly, the diaphragm 60 moves the relief valve body 71 in the −Z direction and presses the + Z end of the valve shaft 22 in the −Z direction. As a result, the diaphragm 60 moves the valve body 20 in the −Z direction to open the flow path 15 of the inner cylinder 152.

On the other hand, when the urging force of the spring 50 is larger than the fluid pressure, the diaphragm 60 is deformed into a concave shape in the + Z direction by the fluid pressure. Thereby, the diaphragm 60 moves the relief valve body 71 in the + Z direction to separate the relief valve body 71 from the + Z end of the valve shaft 22. As a result, the diaphragm 60 enables the valve shaft 22 and the valve body 20 to move in the + Z direction. Since the valve body 20 is always urged in the + Z direction by the auxiliary spring 40, the valve body 20 moves in the + Z direction and closes the flow path 15 of the inner cylinder 152.

The relief valve 70 is a member that opens the valve and lowers the fluid pressure when the fluid pressure increases with the valve body 20 closing the flow path 15 of the inner cylinder 152. As shown in FIG. 4, the relief valve 70 urges the relief valve body 71, the relief valve seat 72 on which the relief valve body 71 can come into contact, and the relief valve body 71 toward the relief valve seat 72. And a relief valve spring 73.

The relief valve element 71 is formed in a shape in which the valve shaft 710 extends in the + Z direction from the center of the disc. Further, as shown in FIGS. 2 and 3, a sealing material 711 for closely contacting the relief valve seat 72 is provided on the + Z surface of the disc of the relief valve body 71.

On the other hand, the relief valve seat 72 is formed in a shape in which an annular flange is provided at the −Z end of the cylindrical portion, as shown in FIG. As shown in FIGS. 2 and 3, the cylindrical portion of the relief valve seat 72 is inserted into the hole of the diaphragm 60, and the flange portion of the relief valve seat 72 is in contact with the −Z surface of the diaphragm 60. The relief valve seat 72 is fixed to the diaphragm 60 in this state. The cylindrical portion of the relief valve seat 72 accommodates a relief valve spring 73 into which the valve shaft 710 is inserted. The valve shaft 710 is provided with a spring clamp 712 that clamps the + Z end of the relief valve spring 73.

The relief valve spring 73 is constituted by a coil spring. The relief valve spring 73 is sandwiched between the spring clamp 712 and the -Z end disk of the relief valve seat 72 in a compressed state. Thereby, the valve shaft 710 is biased in the + Z direction. As a result, the state where the relief valve body 71 abuts on the relief valve seat 72, that is, the state where the valve is closed is maintained.

On the other hand, in the + Z direction with respect to the valve shaft 710 of the relief valve body 71, the diaphragm 60 is deformed into a concave shape in the + Z direction in order to change the valve from the closed state at the relief valve seat 72 to the open state. A relief valve adjusting member 90 is provided that contacts the valve shaft 710 and separates the relief valve body 71 from the relief valve seat 72 when the relief valve body 71 moves in the + Z direction.

As shown in FIG. 4, the relief valve adjusting member 90 is formed in the shape of a pin extending in the Z direction. As shown in FIGS. 2 and 3, a cylindrical head 91 is provided at the + Z end of the relief valve adjusting member 90. An O-ring 92 that is a hermetic seal is provided on the outer periphery of the head 91. Furthermore, a male screw (not shown) is formed. The adjusting member 80 is formed with a screw hole into which the relief valve adjusting member 90 is inserted. A female screw into which the male screw of the head 91 is screwed is formed in the screw hole. The relief valve adjusting member 90 is inserted into the screw hole of the adjusting member 80, and the male screw of the head 91 is screwed into the female screw of the screw hole of the adjusting member 80.

At the + Z end of the head 91, a groove 93 for turning the relief valve adjusting member 90 with a tool driver is formed. The relief valve adjusting member 90 is moved in the Z direction along the female screw of the screw hole of the adjusting member 80 when the groove 93 is rotated by a driver. As a result, the relief valve adjusting member 90 can adjust the position where the relief valve body 71 contacts the valve shaft 710, and the position where the relief valve body 71 moves away from the relief valve seat 72 and the valve opens.

The adjusting member 80 is a member that adjusts the compression amount of the spring 50 by changing the position where the + Z end of the spring 50 is pressed. The adjustment member 80 is formed in a cylindrical shape having an outer diameter larger than that of the coil of the spring 50 in order to hold down the + Z end of the spring 50. The cylindrical hole of the adjusting member 80 is processed into a screw hole in which the above-described female screw is formed on the inner wall. Then, the relief valve adjusting member 90 is inserted, and the female screw of the relief valve adjusting member 90 is screwed into the screw hole of the adjusting member 80 as described above. As a result, the relief valve adjusting member 90 is fixed to the adjusting member 80. On the −Z side of the adjustment member 80, a small cylindrical portion 81 having an outer diameter smaller than that of the adjustment member 80 and the same inner diameter is formed to guide the relief valve adjustment member 90.

Further, an O-ring 82 is provided on the outer periphery of the adjustment member 80 as a hermetic seal. Furthermore, a male screw (not shown) is formed. The adjustment member 80 is inserted into the opening of the upper lid 110, and the male screw of the adjustment member 80 is screwed into the female screw formed on the inner wall of the opening of the upper lid 110. Thereby, the adjusting member 80 is fixed to the upper lid 110.

Although not shown, the cylinder of the adjustment member 80 is formed with a protrusion into which a wrench and a spanner as tools are fitted. The adjustment member 80 is movable in the Z direction by being rotated by a tool. Thereby, the adjustment member 80 is moved in the Z direction, and the position where the + Z end of the spring 50 is pressed is adjusted. As a result, the amount of compression of the spring 50 is adjusted, and the urging force of the spring 50 is adjusted.
Next, the operation of the pressure reducing valve 1A will be described with reference to FIGS.

FIG. 5 is a cross-sectional view of the pressure reducing valve 1A when the fluid is supplied and the valve body 20 is separated from the valve seat 30 and the valve is opened. FIG. 6 is a cross-sectional view of the pressure reducing valve 1A when the fluid pressure of the fluid increases and the valve body 20 contacts the valve seat 30 and the valve is closed. FIG. 7 is a cross-sectional view of the pressure reducing valve 1A when the fluid pressure is further increased and the relief valve 70 is opened.
In the following description, when the diaphragm 60 is deformed by the fluid pressure Pc, the adjustment member 80 compresses the spring 50 so that the force applied from the diaphragm 60 to the spring 50 and the urging force of the spring 50 become the same magnitude. Assume that the amount is adjusted. Further, when the diaphragm 60 is deformed by the fluid pressure Ps, the −Z end of the relief valve adjusting member 90 abuts on the + Z end of the valve shaft 710 of the relief valve body 71 and the + Z end of the valve shaft 710 is − It is assumed that the position has been adjusted to be pushed down by a certain amount in the Z direction. The fluid pressure Ps is higher than the fluid pressure Pc.

As shown in FIG. 5, when the fluid pressure of the fluid is lower than the fluid pressure Pc, the diaphragm 60 is pressed to the −Z side by the urging force of the spring 50. As a result, the diaphragm 60 is convex to the −Z side. Is deformed. As a result, the diaphragm 60 presses the relief valve element 71 against the + Z end of the valve shaft 22 and further in the −Z direction. As a result, the valve body 20 at the −Z end of the valve shaft 22 is separated from the valve seat 30. In other words, the valve of the pressure reducing valve 1A is opened. For this reason, when the fluid pressure of the fluid is lower than the fluid pressure Pc, the fluid flows from the inlet 13 to the outlet 14 in the pressure reducing valve 1A.

When the fluid has the same fluid pressure as the fluid pressure Pc, as shown in FIG. 6, due to the fluid pressure, the convex shape on the −Z side of the diaphragm 60 does not protrude toward the −Z side as compared with the state shown in FIG. It becomes a shape. In other words, the amount of protrusion of the diaphragm 60 toward the −Z side is small. On the other hand, the relief valve element 71 provided in the diaphragm 60 is biased in the + Z direction by the relief valve spring 73, and thereby maintains a state of contacting the relief valve seat 72. For this reason, the relief valve body 71 moves together with the diaphragm 60 to the + Z side from the position shown in FIG. As a result, the amount by which the diaphragm 60 pushes the + Z end of the valve shaft 22 through the relief valve body 71 is reduced, and the valve shaft 22 is movable in the + Z direction. Since the valve body 20 is always urged in the + Z direction by the auxiliary spring 40, the valve body 20 moves in the + Z direction together with the valve shaft 22 from the position shown in FIG. Thereby, the valve body 20 contacts the valve seat 30. That is, the valve of the pressure reducing valve 1A is closed. As a result, the fluid does not flow from the inlet 13 to the outlet 14, and the fluid pressure on the outlet 14 side is reduced.

When the fluid pressure of the fluid exceeds the fluid pressure Pc and reaches the fluid pressure Ps, the diaphragm 60 is deformed into a concave shape on the + Z side by the fluid pressure, as shown in FIG. Thereby, the relief valve seat 72 of the relief valve 70 provided in the diaphragm 60 moves in the + Z direction together with the relief valve body 71 from the state shown in FIG. Then, the + Z end of the valve shaft 710 of the relief valve body 71 contacts the −Z end of the relief valve adjusting member 90, and the valve shaft 710 is pushed down by a certain amount in the −Z direction. As a result, the relief valve body 71 is pushed down in the −Z direction, the relief valve body 71 moves away from the relief valve seat 72, and the relief valve 70 opens. Thereby, the fluid is discharged from the discharge port 12. As a result, the fluid pressure of the fluid is prevented from exceeding the fluid pressure Ps.

As described above, the pressure reducing valve 1A according to the first embodiment includes the adjusting member 80 that adjusts the magnitude of the urging force of the spring 50. Therefore, the fluid pressure at which the diaphragm 60 is deformed to the + Z side, that is, the spring 50 side and the valve body 20 contacts the valve seat 30 can be changed. As a result, the fluid pressure to be reduced by closing the valve body 20 of the pressure reducing valve 1A can be adjusted. In the pressure reducing valve 1A, even if the biasing force of the spring 50 varies from a desired biasing force during assembly, the fluid pressure to be reduced can be adjusted by the adjusting member 80.

The adjustment member 80 is formed with a male screw that is screwed into a female screw formed on the upper lid 110 of the housing 10. For this reason, the position of the adjusting member 80 can be easily adjusted by moving the male screw of the adjusting member 80 along the female screw of the upper lid 110. As a result, in the pressure reducing valve 1A, the fluid pressure to be reduced by closing the valve body 20 can be adjusted.

Further, the pressure reducing valve 1A is provided with a relief valve adjusting member 90 that contacts the valve shaft 710 of the relief valve body 71 and separates the relief valve body 71 from the relief valve seat 72. The relief valve adjusting member 90 is provided with a head 91 that adjusts the position where the relief valve adjusting member 90 abuts. For this reason, the fluid pressure to be reduced by closing the relief valve 70 can be adjusted.

The relief valve adjusting member 90 is formed with a male screw that is screwed into the female screw formed on the adjusting member 80. For this reason, the position of the relief valve adjusting member 90 can be easily adjusted by moving the male screw of the relief valve adjusting member 90 along the female screw of the adjusting member 80. Further, since the relief valve adjusting member 90 and the adjusting member 80 are coaxial, the operation of adjusting the positions of the relief valve adjusting member 90 and the adjusting member 80 is easy.

(Embodiment 2)
The pressure reducing valve 1B according to Embodiment 2 has two outlets. The pressure reducing valve 1B according to the second embodiment will be described below with reference to FIGS. In the second embodiment, a configuration different from that of the first embodiment will be described.

FIG. 8 is a perspective view of a pressure reducing valve 1B according to Embodiment 2 of the present invention. FIG. 9 is a perspective view of the pressure reducing valve 1B shown in FIG. 8 taken along the XZ plane. FIG. 10 is a cross-sectional view of the pressure reducing valve 1B. FIG. 11 is an exploded view of the pressure reducing valve 1B.
As shown in FIG. 8, the pressure reducing valve 1 </ b> B has a second outlet 16 formed in the lower lid 140.

The lower lid 140 is formed in a cylindrical shape as shown in FIGS. The cylinder of the lower lid 140 is oriented in the Z direction, and is open on the Z side and the −Z side. Thereby, the internal space of the lower lid 140 forms a flow path that branches from the internal space of the valve housing 130 to the Z side. Then, the fluid flows from the internal space of the valve housing 130, whereby the opening on the −Z side of the lower lid 140 functions as the second outlet 16.

A protrusion 142 is formed on the inner wall of the lower lid 140 to support the + Z end of the auxiliary spring 40. The protrusion 142 is disposed at a position where the distance to the valve body 20 located on the + Z side is smaller than the natural length of the auxiliary spring 40. The auxiliary spring 40 is sandwiched between the + Z surface of the protrusion 142 and the −Z surface of the valve body 20 to compress the auxiliary spring 40. As a result, the auxiliary spring 40 biases the valve body 20 in the + Z direction, that is, in the direction of the valve seat 30.

The pressure reducing valve 1B according to the second embodiment has the same configuration as the pressure reducing valve 1A according to the first embodiment, except that the second outlet 16 is formed. Therefore, the operation of the pressure reducing valve 1B is the same as that of the pressure reducing valve 1A according to Embodiment 1 except that the fluid flows out to the second outlet 16 in addition to the outlet 14. For this reason, in Embodiment 2, description of operation | movement of the pressure reducing valve 1B is abbreviate | omitted.

As described above, in addition to the outflow port 14 formed in the valve housing 130, the second outflow port 16 is formed in the lower lid 140 in the pressure reducing valve 1B according to the second embodiment. The pressure reducing valve 1B also includes an adjustment member 80 and a relief valve adjustment member 90, as in the first embodiment. Therefore, even in the pressure reducing valve 1B having the outlet 14 and the second outlet 16, the fluid pressure to be reduced by closing the valve body 20 of the pressure reducing valve 1A, and the relief valve 70 should be reduced by closing the relief valve body 71. The fluid pressure can be adjusted.

(Embodiment 3)
The pressure reducing valve 1 </ b> C according to the third embodiment includes an auxiliary spring adjusting member 41 that adjusts the biasing force of the auxiliary spring 40. The pressure reducing valve 1C according to the third embodiment will be described below with reference to FIGS. In the third embodiment, a configuration different from the first and second embodiments will be described.

FIG. 12 is a perspective view of a pressure reducing valve 1C according to Embodiment 3 of the present invention. 13 is a perspective view of the pressure reducing valve 1C shown in FIG. 12, taken along the XZ plane. FIG. 14 is a cross-sectional view of the pressure reducing valve 1C. FIG. 15 is an exploded view of the pressure reducing valve 1C.
As shown in FIG. 15, the lower lid 141 has a through-hole 143 extending in the Z direction and having an internal thread formed on the inner wall.

As shown in FIGS. 13 and 14, the through-hole 143 has a cylindrical pin that can be inserted into the through-hole 143 and a disk-shaped pin head that is provided on the −Z side of the pin and has a larger outer diameter than the cylinder. An auxiliary spring adjusting member 41 having a shape connected to the portion is inserted. A male screw that can be screwed into a female screw on the inner wall of the through hole 143 is formed on the outer periphery of the pin head of the auxiliary spring adjusting member 41. The auxiliary spring adjusting member 41 is fixed to the lower lid 141 by screwing the male screw on the pin head of the auxiliary spring adjusting member 41 into the female screw on the inner wall of the through hole 143.

The + Z end of the auxiliary spring adjustment member 41 is located on the + Z side with respect to the recess in the lower lid 141. A support plate 42 that supports the −Z end of the auxiliary spring 40 is disposed at the + Z end of the auxiliary spring adjusting member 41. Thus, the auxiliary spring adjustment member 41 supports the −Z end of the auxiliary spring 40 via the support plate 42. As the auxiliary spring adjusting member 41 rotates, the male screw on the pin head of the auxiliary spring adjusting member 41 moves along the female screw on the inner wall of the through hole 143, and the auxiliary spring adjusting member 41 moves in the Z direction. To do. As a result, the auxiliary spring adjusting member 41 can adjust the position of the support plate 42 in the Z direction to adjust the position of the −Z end of the auxiliary spring 40. As a result, the urging force of the auxiliary spring 40 can be adjusted.

The pressure reducing valve 1C according to the third embodiment has the same configuration as the pressure reducing valve 1A according to the first embodiment, except that the auxiliary spring adjusting member 41 is provided. For this reason, the operation of the pressure reducing valve 1C after the urging force of the auxiliary spring 40 is adjusted by the auxiliary spring adjusting member 41 is the same as the operation of the pressure reducing valve 1A according to the first embodiment. For this reason, in Embodiment 3, description of operation | movement of the pressure reducing valve 1C is abbreviate | omitted.

As described above, the pressure reducing valve 1C according to the third embodiment includes the auxiliary spring adjusting member 41, so that the biasing force of the auxiliary spring 40 can be adjusted. In the pressure reducing valve 1 </ b> C, when the desired relative biasing force of the auxiliary spring 40 to the spring 50 cannot be obtained by assembly, the biasing force of the auxiliary spring 40 can be adjusted using the auxiliary spring adjusting member 41. .

As mentioned above, although embodiment of this invention was described, this invention is not limited to said embodiment. For example, in Embodiment 1-3, the adjusting member 80 and the relief valve adjusting member 90 are formed with male threads. However, the present invention is not limited to this. In the present invention, the adjustment member 80 only needs to be held in the housing 10 so as to be movable in a direction in which the spring 50 is compressed or extended, and the magnitude of the urging force of the spring 50 can be adjusted. Further, the relief valve adjusting member 90 only needs to be held by the housing 10 so as to be movable from the spring 50 side to the relief valve body 71 side or in the opposite direction. For this reason, even if the adjusting member 80 and the relief valve adjusting member 90 are held by the housing 10 by forming the female screw on the adjusting member 80 and the relief valve adjusting member 90 and forming the male screw on the housing 10. Good.

In Embodiment 1-3, the adjusting member 80 and the relief valve adjusting member 90 are arranged coaxially. However, the adjusting member 80 and the relief valve adjusting member 90 do not have to be arranged coaxially, and the X direction Alternatively, they may be arranged in the Y direction.

In Embodiment 1-3, the member that contacts the relief valve body 71 from the spring 50 side and separates the relief valve body 71 from the relief valve seat 72 is referred to as the relief valve adjusting member 90. Since it is a member that separates the valve body 71 and the relief valve seat 72, it may be referred to as a separation member.

In Embodiment 1-3, the springs included in the pressure reducing valve 1A-1C are referred to as the auxiliary spring 40, the spring 50, and the relief valve spring 73. However, in the present invention, these members may be elastic members that are elastically deformed. For this reason, these members may be formed of rubber. For example, the auxiliary spring 40, the spring 50, and the relief valve spring 73 may be referred to as a first elastic member, a second elastic member, and a third elastic member.

In Embodiment 1-3, the opening of the upper lid 110 of the housing 10 is formed as a female screw on the inner wall, and may be referred to as a screw hole.

In Embodiment 1-3, the adjustment member 80 is formed with a screw hole into which the relief valve adjustment member 90 is screwed. However, as described above, in the present invention, the screw hole into which the relief valve adjusting member 90 is screwed may be formed in the housing 10. In this case, the screw hole formed in the housing 10 may be referred to as a second screw hole because the screw hole is also formed in the upper lid 110 of the housing 10. The screw hole formed in the adjustment member 80 described in Embodiment 1-3 may be referred to as a third screw hole.

In Embodiment 1-3, it is described that a fluid flows through the pressure reducing valve 1A-1C. However, the fluid is, for example, water used in a water heater or a refrigerant used in an air conditioner. In this way, the pressure reducing valve 1A-1C can be applied to a water heater, an air conditioner, and the like.

The present invention is capable of various embodiments and modifications without departing from the broad spirit and scope of the present invention. Further, the above-described embodiment is for explaining the present invention, and does not limit the scope of the present invention. That is, the scope of the present invention is shown not by the embodiments but by the claims. Various modifications within the scope of the claims and within the scope of the equivalent invention are considered to be within the scope of the present invention.

This application is based on Japanese Patent Application No. 2018-29475 filed on Feb. 22, 2018. The specification, claims, and entire drawings of Japanese Patent Application No. 2018-29475 are incorporated herein by reference.

1A-1C Pressure reducing valve, 10 housing, 12 outlet, 13 inlet, 14 outlet, 15 flow path, 16 second outlet, 20 valve body, 21 sealing material, 22 valve stem, 23 O-ring, 24 closely Part, 30 valve seat, 40 auxiliary spring, 41 auxiliary spring adjusting member, 42 support plate, 50 spring, 60 diaphragm, 61 washer, 70 relief valve, 71 relief valve body, 72 relief valve seat, 73 relief valve spring, 80 Adjusting member, 81 small cylindrical part, 82 O-ring, 90 relief valve adjusting member, 91 head, 92 O-ring, 93 groove, 110 upper lid, 111 cylindrical part, 112 rectangular parallelepiped part, 120 lower lid, 121 O-ring, 122 dent , 130 valve housing, 131 cuboid part, 132, 133 cylindrical part, 140 lower lid, 141 lower lid, 142 protrusions, 143 Through-holes, 151 partition wall, 152 inner cylinder, 153 opening, 710 valve shaft, 711 sealing material, 712 a spring clasp.

Claims

A housing in which a flow path connecting the inlet into which the fluid flows in and the outlet through which the fluid flows out is formed;
A valve seat formed in the flow path;
A valve body capable of contacting the valve seat;
A first elastic member for urging the valve body in a direction in contact with the valve seat;
A second elastic member that urges the valve body in a direction away from the valve seat and has a larger urging force than the first elastic member;
The first elastic member is disposed between the second elastic member and the valve body, and one surface abuts on the second elastic member to receive the urging force of the second elastic member, and the other surface is the flow path. When the urging force of the second elastic member is larger than the force due to the fluid pressure, it is deformed to the valve body side when it receives the fluid pressure of the fluid in contact with the portion on the outlet side of the valve seat. The valve body is separated from the valve seat, and when the urging force of the second elastic member is smaller than the force due to the fluid pressure, the valve body is deformed to the second elastic member side, and the valve body is deformed by the first elastic member. A diaphragm to contact the valve seat;
An adjustment member that is held by the housing so as to be movable in a direction in which the second elastic member is compressed or extended, and adjusts the magnitude of the urging force of the second elastic member;
A pressure reducing valve.
The adjusting member is screwed into a screw hole penetrating the housing in a direction in which the second elastic member compresses, and is rotated along the screw hole to compress or extend the second elastic member. Is movable in the direction of
The pressure reducing valve according to claim 1.
A relief valve seat provided in a through-hole penetrating the diaphragm, and a relief valve having a relief valve body capable of contacting the relief valve seat from the valve body side of the diaphragm;
A third elastic member for urging the relief valve body in a direction in contact with the relief valve seat;
When the diaphragm receives a fluid pressure of the fluid larger than the biasing force of the second elastic member and deforms to the second elastic member side, the relief valve from the second elastic member side of the diaphragm A spacing member that contacts the body and separates the relief valve body from the relief valve seat;
With
The spacing member is held in the housing so as to be movable from the second elastic member side to the relief valve body side or in the opposite direction.
The pressure reducing valve according to claim 1 or 2.
The spacing member is screwed into a second screw hole penetrating the housing in the direction from the second elastic member side to the relief valve body side, and is rotated along the second screw hole. Then, it is movable from the side of the second elastic member to the direction of the relief valve body or the opposite direction.
The pressure reducing valve according to claim 3.
The direction from the second elastic member side to the relief valve body side is a direction in which the second elastic member compresses,
The adjusting member is screwed into a screw hole penetrating the housing in a direction in which the second elastic member compresses, and is rotated along the screw hole to compress or extend the second elastic member. Can be moved in the direction
The separation member is screwed into a third screw hole that penetrates the adjustment member in a direction in which the second elastic member is compressed, and is rotated along the third screw hole, whereby the second elastic member Is movable in the direction of compression or expansion,
The pressure reducing valve according to claim 3.
The adjustment member and the separation member are movable in a direction in which the second elastic member is compressed or extended by rotating in the same direction.
The pressure reducing valve according to claim 5.
The adjustment member is held by the casing with a hermetic seal interposed therebetween,
The pressure reducing valve according to any one of claims 1 to 6.