JP5806135B2 - Pressure regulating valve - Google Patents

Description

  The present invention relates to a pressure regulating valve.

  A pressure regulating valve having a hole penetrating the inside and the outside of the valve body of the pressure regulating valve is known (Patent Document 1).

JP 61-54350 A

  In the prior art, the valve body may rotate around the axis of the valve body.

  The present invention has been made to solve at least a part of the above-described problems, and an object thereof is to suppress the rotation of the valve body.

SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples. According to one aspect of the present invention, a pressure regulating valve is provided. The pressure regulating valve is a valve body having a piston having a space inside, and is a second point on the outer surface of the piston through the space from a first point on the outer surface of the piston, A valve body having a plurality of holes that extend straight to a second point different from the point; and a valve seat that contacts the valve body, wherein the plurality of holes are parallel to a direction perpendicular to a central axis of the valve body. In addition, the holes are in a twisted position with respect to the central axis, and the plurality of holes have the same thickness, and the distance between each of the plurality of holes and the central axis is the same. According to the pressure regulating valve of this embodiment, the rotational moment for rotating the valve body by the fluid discharged from the plurality of holes in the clockwise direction and the magnitude of the rotational moment for rotating in the counterclockwise direction can be made the same. As a result, it is possible to cancel these rotational moments and not generate a force for rotating the valve body.

[Application Example 1]
A pressure regulating valve, which has a hollow portion inside, and penetrates straight from the first point outside the valve body through the hollow portion toward the second point of the valve body. A valve body having a plurality of through-holes, and a valve seat that contacts the valve body, wherein the plurality of through-holes are parallel to a direction perpendicular to the central axis of the valve body and the central axis The pressure regulating valve, wherein the plurality of through holes have the same thickness, and the distance between each of the plurality of through holes and the central axis is the same size.
According to this application example, the rotational moment for rotating the valve body by the fluid discharged from the plurality of through holes in the clockwise direction and the magnitude of the rotational moment for rotating in the counterclockwise direction can be made the same. As a result, it is possible to cancel these rotational moments and not generate a force for rotating the valve body.

[Application Example 2]
The pressure regulating valve according to Application Example 1, wherein the plurality of through holes are provided on the same plane perpendicular to the central axis.
According to this application example, the plurality of through-holes are provided on a plane perpendicular to the central axis, so that the rotational moment in the clockwise direction and the rotational moment in the counterclockwise direction can be reliably made the same. You can avoid the force of rotating your body.

[Application Example 3]
The pressure regulating valve according to Application Example 1 or 2, wherein the number of the plurality of through holes is an even number, and the plurality of through holes are mirror-symmetric with respect to a plane including the central axis.
According to this application example, the number of the plurality of through holes may be an even number, and if the plurality of through holes are mirror symmetrical with respect to the plane including the central axis, The torque in the clockwise direction can be made the same, and the force to rotate the valve element can be eliminated.

  In addition, this invention can be implement | achieved with various forms, for example, can be implement | achieved with forms, such as a valve body of a pressure regulation valve other than a pressure regulation valve.

It is explanatory drawing which shows the pressure regulation valve of a present Example. It is explanatory drawing which shows the state which began to supply gas to an input port. It is explanatory drawing which expands and shows the vicinity of a hole from a valve seat. It is sectional drawing containing a hole. It is explanatory drawing which shows a mode that gas is discharged | emitted from a hole. It is explanatory drawing which shows the modification of a present Example.

  FIG. 1 is an explanatory view showing a pressure regulating valve of the present embodiment. The pressure regulating valve 10 includes a lower case 20, an upper case 30, a lower piston 200 (also referred to as “poppet 200”), an upper piston 300, a valve seat 250, a cylindrical member 260, an input port 220, and an output. A port 270 and a spring 350 are provided. The lower case 20 includes cylindrical recesses 22 and 24 and side holes 26. An output port 270 having a hollow portion 272 is connected to the side surface of the lower case 20 by a screw 280, and the hollow portion 272 is connected to the side hole 26. An O-ring 275 is provided between the lower case 20 and the output port 270.

  The central axis of the concave portion 22, the central axis of the concave portion 24, and the central axis of the lower case 20 are the same. This central axis is referred to as “central axis O”. The recess 24 is formed on the upstream side of the recess 22, and the diameter of the recess 24 is smaller than the diameter of the recess 22 and is formed in a stepped shape. A valve seat 250 is disposed at a step portion between the recess 22 and the recess 24. The valve seat 250 has a through hole 255 coaxial with the central axis O at the center.

  Inside the recess 24, an input port 220 and a lower piston 200 are disposed. The lower piston 200 has a hollow portion 202 opened on the upstream side (lower side in the drawing). The downstream side of the lower piston 200 has a conical portion 210 that tapers. This conical portion 210 functions as a valve body. Therefore, this conical portion 210 is also referred to as “valve element 210”. An input port 220 is fitted in the hollow portion 202. The input port 220 is fixed to the end surface of the lower piston 200 with a screw 230. An O-ring 225 is disposed between the input port 220 and the end surface of the lower piston 200. The input port 220 has a through hole 222 along the central axis O, and high-pressure gas flows from the outside toward the through hole 222. On the downstream side of the hollow portion 202, two holes 204 and 206 that communicate the hollow portion 202 and the outside of the lower piston 200 are formed. The holes 204 and 206 will be described later.

  A cylindrical member 260 is disposed inside the recess 22. The outer diameter of the cylindrical member 260 is substantially the same as the inner diameter of the recess 22, but the length of the cylindrical member 260 is larger than the depth of the recess 22 and is larger than the end surface of the lower case 20 on the upper case 30 side. It protrudes to the upper case 30 side. A lower part 305 of the upper piston 300 is inserted inside the cylindrical member 260. The lower portion 305 has a tapered conical portion 307, and the tip of the conical portion 307 is joined to the tip of the conical portion 210 of the lower piston 200. Therefore, the upper piston 300 and the lower piston 200 operate as a unit. The joint between the lower piston 200 and the upper piston 300 is constricted, and the valve seat 250 is disposed in the constriction. Note that the thickness of the constriction is smaller than the through hole 255 of the valve seat 250.

  The upper part 310 of the upper piston 300 has a round basin shape having a cylindrical edge 312 on the opposite side to the lower part. The upper case 30 is disposed so as to cover the upper piston 300. The upper case 30 is attached to the lower case 20 with screws 35, and an O-ring 37 is disposed between the upper case 30 and the lower case 20. A spring 350 is disposed between the upper case 30 and the upper portion 310 of the upper piston 300. An O-ring 315 is disposed between the upper piston 312 and the upper case 30.

  The inside of the hollow portion 202 of the lower piston 200 is the “space 400”, the outside of the lower piston 200, the lower piston side of the valve seat 250 is the “space 410”, and the space between the lower portion 305 of the upper piston 300 and the cylindrical member 260 Is called “space 420”, and the inside of the side hole 26 is called “space 430”.

  The operation of the pressure regulating valve 10 will be described. When no gas is supplied to the input port 220, the upper piston 300 is biased toward the input port 220 by the spring 350. On the other hand, the cylindrical member 260 protrudes toward the upper case 30 side from the end surface of the lower case 20 on the upper case 30 side. As a result, the upper piston 300 stops at a position where the upper portion 310 of the upper piston 300 hits the cylindrical member 260. Therefore, in this state, the space 420 and the space 430 are not connected. In this state, the constricted portion of the joint between the upper piston 300 and the lower piston is located at the position of the through hole 255 of the valve seat 250. Since the thickness of the constriction is smaller than the inner diameter of the through hole 255 as described above, a gap is generated between the through hole 255 and the constriction. Therefore, the space 410 and the space 420 are connected via this gap. The space 400 and the space 410 are connected via the holes 204 and 206.

FIG. 2 is an explanatory diagram illustrating a state in which gas has started to be supplied to the input port. When gas is supplied to the input port 220, the gas enters the space 400 inside the hollow portion 202 of the lower piston 200 and flows into the space 410 through the holes 204 and 206. At this time, if the density of the fluid is ρ and the flow velocity along the fluid flow line is v, a pressure loss ΔP represented by the following equation (1) occurs. In addition, (delta) is a proportionality coefficient and takes the value between 0.2-0.4.

  As a result of the pressure loss ΔP, the pressure in the space 410 becomes lower than the pressure in the space 400. Due to the pressure difference, the lower piston 200 is pushed upward together with the upper piston 300, and a gap 440 is generated between the upper piston 300 and the cylindrical member 260. As a result, the gas in the space 420 flows through the gap 440 to the space 430, and the pressure in the space 420 decreases. When the lower piston 200 is pushed upward, the conical portion 210 (valve element) is also pushed up, and the gap between the through hole 255 of the valve seat 250 and the conical portion 210 is narrowed. The gas supplied from the input port 220 is output to the output port 270 through the space 400, the hole 204 (206), the spaces 410 and 420, the gap 440, and the space 430.

FIG. 3 is an explanatory diagram showing an enlarged view of the vicinity of the hole 204 (206) from the valve seat. FIG. 4 is a cross-sectional view including the hole 204 (206). As shown in FIG. 4, the hole 204 is a hole that extends straight from the first point (discharge port 204a) on the outer surface of the lower piston 200 to the second point (discharge port 204b) on the other outer surface through the space 400. is there. Similarly, the hole 206 is a hole extending straight from the first point (discharge port 206a) on the outer surface of the lower piston 200 through the space 400 to the second point (discharge port 206b) on the other outer surface. Here, if the distance between the hole 204 and the central axis O is L1, and the distance between the hole 206 and the central axis O is L2, then L1 = L2. The hole 204 and the hole 206 have the same thickness. The holes 204 and 206 are on the same plane perpendicular to the central axis O. Note that the hole 204 and the hole 206 have a mirror symmetry (plane symmetry) with respect to the mirror surface MP passing through the central axis O.

  As shown in FIG. 3, the gas supplied from the input port 220 passes through the space 400 and the hole 204 (206) and is discharged into the space 410. At this time, as described above, the hole 204 has two discharge ports 204a and 204b, and the hole 206 has two discharge ports 206a and 206b. Therefore, the gas is discharged from the four discharge ports to the space 410.

  FIG. 5 is an explanatory view showing a state in which gas is discharged from the holes 204 and 206. A gas having a flow rate Q1 is discharged from the discharge port 204a at a flow velocity V1. Similarly, gas at flow rates Q2 to Q4 is discharged from the discharge ports 204b, 206a, and 206b at flow rates V2 to V4, respectively. Here, since the distance between the hole 204 and the central axis O is the same as the distance between the hole 206 and the central axis O, and the thickness of the hole 204 and the hole 206 is the same, the flow rates Q1 to Q4 are The flow rates V1 to V4 are the same.

  Due to the reaction of the gas discharged from the discharge port 204a and the discharge port 206b, a couple moment N1 is generated in FIG. 5 which attempts to rotate the lower piston 200 counterclockwise. On the other hand, due to the reaction of the gas discharged from the discharge port 204b and the discharge port 206a, a couple moment N2 is generated to try to rotate the lower piston 200 clockwise in FIG. Here, the couple moments N1 and N2 have the same magnitude and the opposite rotation directions. Accordingly, the couple moments N1 and N2 cancel each other, and as a result, a force for rotating the lower piston 200 does not occur.

As described above, according to the present embodiment, the lower piston 200 moves from the first point on the outer surface (the discharge port 204a or the discharge port 206a) through the space 400 to the second point on the other outer surface (the discharge port 204b or the discharge port 206b). ) Have two holes 204, 206 extending straight. The diameters of the two holes 204 and 206 are the same, and the distance between the central axis O and the hole 204 and the distance between the central axis O and the hole 206 are the same. Therefore, the counter-clockwise couple moment N1 due to the reaction of the gas discharged from the discharge port 204a and the discharge port 206b, and the clockwise couple force moment due to the reaction of the gas discharged from the discharge port 204b and the discharge port 206a. N2 has the same size and the opposite direction of rotation. As a result, the couple moments N1 and N2 cancel each other, and as a result, the force to rotate the lower piston 200 can be prevented.

  In this embodiment, the hole 204 and the hole 206 are on the same plane perpendicular to the central axis O, but may not be on the same plane. If the two holes 204 and 206 have the same thickness, and the distance between the center axis O and the hole 204 is the same as the distance between the center axis O and the hole 206, the counterclockwise rotational moment (couple force) The moment N1) and the clockwise rotational moment (couple moment N2) have the same magnitude, so that a force for rotating the lower piston 200 can be prevented. However, the hole 204 and the hole 206 are more preferably on the same plane perpendicular to the central axis O. If the holes 204 and 206 are on the same plane perpendicular to the central axis O, the rotational moment N1 in the counterclockwise direction and the rotational moment N2 in the clockwise direction can be reliably made the same.

  FIG. 6 is an explanatory diagram showing a modification of the present embodiment. In the present embodiment, as shown in FIG. 4, the outer surface of the lower piston 200 is a square, but in the modification shown in FIG. 6A, the outer surface of the lower piston 200 is a hexagon. In this way, the outer surface of the lower piston 200 may be hexagonal, and holes 2041 and 2061 extending straight from one point on the outer surface to one point on the opposite side through the space 400 may be formed. The hole 2041 and the hole 2061 are mirror-symmetric with respect to the mirror plane MP. Also in this modification, as in the present embodiment, the clockwise couple moment and the counterclockwise couple moment can be made the same magnitude, and a force to rotate the lower piston 200 is generated. Can be eliminated. Note that the reason why the outer surface of the lower piston 200 is polygonal in this embodiment and the modification is to make the holes 204 and 206 easier to drill. That is, the holes 204 and 206 can be easily formed by making a hole perpendicular to the surface.

  FIG. 6B is an explanatory diagram showing another modification. In this variation, the holes 2042 and 2062 formed in the lower piston 200 are not parallel but perpendicular to each other. Further, the holes 2042 and 2062 are in a mirror symmetry relation with respect to the mirror surface MP. As described above, even if the holes 2042 and 2062 are not parallel, if the mirror moment is symmetrical, the rotational moment does not become a couple moment, but the clockwise rotational moment and the counterclockwise rotation. The moment can be made the same magnitude, and the force to rotate the lower piston 200 can be eliminated. Note that the force caused by the gas blown from the discharge port 2042a and the force caused by the gas blown from the discharge port 2042b have the same magnitude and are opposite in direction on the same line, and thus cancel each other. The same applies to the force generated by the gas blown from the discharge ports 2062a and 2062b.

  FIG. 6C is an explanatory diagram showing another modification. In this modification, the lower piston 200 includes four holes 2043, 2044, 2063, and 2064. The holes 2043 and 2063 are parallel to each other and are mirror-symmetric with respect to the mirror surface MP 1. Moreover, the hole 2044 and the hole 2064 are parallel and are mirror-symmetric with respect to the mirror surface MP2. In this case, the relationship between the hole 2043 and the hole 2063 is the same as the relationship between the holes 204 and 206 in this embodiment, and a force for rotating the lower piston 200 can be prevented from being generated. The same applies to the hole 2044 and the hole 2064. Therefore, as in the present embodiment, it is possible to prevent the force for rotating the lower piston 200 from occurring.

  Moreover, this modification can also be considered similarly to FIG. 6 (B). In the case of this modification, the relationship between the hole 2043 and the hole 2064 is the same as the relationship between the holes 2042 and 2062 shown in FIG. 6B, and is mirror-symmetric with respect to the mirror surface MP3. The relationship between the hole 2044 and the hole 2063 is the same as the relationship between the holes 2042 and 2062 shown in FIG. 6B, and is mirror-symmetric with respect to the mirror surface MP4. Therefore, similarly to the modification shown in FIG. 6B, a force for rotating the lower piston 200 can be prevented. Thus, if the number of holes is an even number, it may not be two.

  The embodiments of the present invention have been described above based on some examples. However, the above-described embodiments of the present invention are for facilitating the understanding of the present invention and limit the present invention. It is not a thing. The present invention can be changed and improved without departing from the spirit and scope of the claims, and it is needless to say that the present invention includes equivalents thereof.

DESCRIPTION OF SYMBOLS 10 ... Pressure regulating valve 20 ... Lower case 22 ... Recessed part 24 ... Recessed part 26 ... Side hole 30 ... Upper case 35 ... Screw 37 ... O-ring 200 ... Lower piston (poppet)
202 ... Hollow portion 204, 206 ... Hole 204a, 204b, 206a, 206b ... Discharge port 210 ... Conical part (valve element)
DESCRIPTION OF SYMBOLS 220 ... Input port 222 ... Through-hole 225 ... O-ring 230 ... Screw 250 ... Valve seat 255 ... Through-hole 260 ... Cylindrical member 270 ... Output port 272 ... Hollow part 275 ... O-ring 280 ... Screw 300 ... Upper piston 305 ... Lower part 307 ... Conical part 310 ... Upper part 312 ... Edge 315 ... O-ring 350 ... Spring 400, 410, 420, 430 ... Space 440 ... Gap 2041, 2042, 2043, 2044 ... Hole 2042a, 2042b ... Discharge ports 2061, 2062, 2063, 2064 ... hole 2062a, 2062b ... discharge port MP, MP1, MP2, MP3, MP4 ... mirror surface N1, N2 ... couple moment O ... center axis Q1-Q4 ... flow rate V1-Q4 ... flow velocity ΔP ... pressure loss

Claims (3)

A pressure regulating valve,
A valve body having a piston having a space inside, a is the second point of the outer surface of the piston via the space from the first point of the outer surface of the piston, different from the first point a valve body having a plurality of immediately extending bore true Tsu to a second point,
A valve seat against the valve body;
With
The plurality of holes are holes that are parallel to a direction perpendicular to the central axis of the valve body and are in a twisted position with respect to the central axis,
The plurality of holes have the same thickness,
The distance between each of the plurality of holes and the central axis is the same size.
Pressure regulating valve. The pressure regulating valve according to claim 1,
The pressure regulating valve, wherein the plurality of holes are provided on the same plane perpendicular to the central axis. The pressure regulating valve according to claim 1 or 2,
The number of the plurality of holes is an even number, and the plurality of holes are mirror-symmetric with respect to a plane including the central axis.

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