JP2018123868A - Gas governor device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas governor device 1 having: a valve body 121 connected to a diaphragm 115 and detachable/attachable from/to a valve seat 112; a diaphragm cover 122 defined in a back-pressure chamber 116 on a back side of the diaphragm; a pressure-adjusting spring 124 in the back-pressure chamber; and an adjusting member 125 for adjusting an urging force of the pressure-adjusting spring threadedly inserted into a cylindrical part 122a provided on the diaphragm cover, in which the gas governor device 1 can surely prevent displacement of the adjusting member after adjustment and improve operability of detaching/attaching a member for preventing contact with the adjusting member.SOLUTION: An annular first non-slip member 126 is provided between an outer peripheral face of an adjusting member 125 and an inner peripheral face of a cylindrical part 122a. Also, as a member for preventing contact with the adjusting member 125, a plug member 127 is inserted into an outer edge part of the cylindrical part 122a. Further, an annular second non-slip member 128 is provided between an outer peripheral face of the plug member 127 and an inner peripheral face of the outer edge part of the cylindrical part 122a.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a gas governor device interposed in a gas supply path or the like for a burner.

  Conventionally, as this type of gas governor device, there are a diaphragm, a valve seat that defines a pressure chamber into which gas flows between the diaphragm, a valve body that is connected to the diaphragm and can be contacted with and separated from the valve seat, and a pressure chamber In contrast, a diaphragm cover that defines a back pressure chamber partitioned by a diaphragm on the back side of the diaphragm, a pressure adjusting spring in the back pressure chamber that urges the diaphragm, and a cylindrical portion provided in the diaphragm cover, What is provided with the adjustment member which adjusts the urging | biasing force of a pressure regulation spring is known.

  In this case, the urging force of the pressure adjusting spring is adjusted by the adjusting member at the time of factory shipment or gas type change maintenance. However, if vibration or the like is applied after adjustment, the adjustment member may move by the backlash of the screw pitch, which may cause an error in pressure adjustment. Therefore, conventionally, an annular first anti-slip member is interposed between the outer peripheral surface of the adjustment member and the inner peripheral surface of the cylindrical portion, and the friction force of the first anti-slip member indicates that the adjustment member moves after adjustment. There is also known a gas governor device which can be prevented by (see, for example, Patent Document 1).

  Further, random adjustment may occur due to random contact with the adjustment member. In view of this, there has been conventionally known a method in which a cap is screwed onto the outer end portion of the cylindrical portion to prevent contact with the adjustment member. However, in this case, when attaching and detaching the cap, it is necessary to turn and tighten or loosen the cap, and the detachability of the cap is deteriorated.

JP, 2006-61372, A

  In view of the above points, the present invention provides a gas governor device that can reliably prevent the adjustment member from moving after adjustment and can improve the detachability of the member that prevents contact with the adjustment member. That is the issue.

  In order to solve the above-described problems, the present invention provides a diaphragm, a valve seat that defines a pressure chamber into which gas flows between the diaphragm, and a valve body that is connected to the diaphragm and is detachable from the valve seat. Threaded into a diaphragm cover that defines a back pressure chamber partitioned by a diaphragm with respect to the pressure chamber on the back side of the diaphragm, a pressure adjusting spring in the back pressure chamber that urges the diaphragm, and a cylindrical portion provided in the diaphragm cover In the gas governor device provided with the adjustment member that adjusts the biasing force of the pressure adjusting spring, the annular first anti-slip member is interposed between the outer peripheral surface of the adjustment member and the inner peripheral surface of the cylindrical portion. In addition, a plug member inserted into the outer end portion of the cylindrical portion is provided, and an annular second anti-slip member is interposed between the outer peripheral surface of the plug member and the inner peripheral surface of the outer end portion of the cylindrical portion. Features.

  According to the present invention, the adjustment member is fixed by the frictional force of the first anti-slip member, and contact with the adjustment member is prevented by the plug member, so that the adjustment member can be reliably prevented from moving after adjustment. And since the plug member can be easily attached to and detached from the outer end of the cylinder portion by pushing or pulling out, the detachability of the plug member is improved. The stopper member is prevented from coming off at the outer end of the cylindrical portion by the frictional force of the second anti-slip member.

  In the present invention, it is desirable that both the first and second anti-slip members have a sealing function. Here, in order for the first anti-slip member and the second anti-slip member to have a sealing function, the first anti-slip member and the second anti-slip member are all provided on the outer peripheral surface of the adjusting member and the plug member and the inner peripheral surface of the cylindrical portion. It is necessary to closely adhere to the circumference, and the frictional force of the first anti-slip member and the second anti-slip member can be obtained with certainty. If air is contained between the adjusting member and the plug member by the sealing function of the first and second anti-slip members, the plug member will move to the outer end of the cylindrical portion when the air expands due to a rise in temperature. It will be pushed out of the part. Therefore, it is desirable to form an air vent hole in the plug member so that the expanded air can escape from the air vent hole.

  The second anti-slip member is composed of an O-ring attached to an annular groove formed on the outer peripheral surface of the stopper member, and this annular groove is a V-groove whose groove bottom is recessed in a V shape radially inwardly. It is desirable to consist of According to this, a deformation space inward in the radial direction of the O-ring is secured, and the compression reaction force of the O-ring is reduced. Therefore, the pushing force and pulling-out force when the plug member is attached to and detached from the outer end of the cylinder part are reduced, and the workability of attaching and detaching the plug member is further improved.

Sectional drawing of the zero governor incorporating the gas governor of embodiment of this invention.

  Referring to FIG. 1, reference numeral 1 denotes a gas governor apparatus according to an embodiment of the present invention incorporated in a zero governor 100 provided in a gas supply path to a burner. The zero governor 100 includes an inlet chamber 101, an intermediate chamber 103 partitioned by the first valve seat 102 with respect to the inlet chamber 101, a first pressure chamber 105 partitioned by the second valve seat 104 with respect to the intermediate chamber 103, An outlet chamber 107 partitioned from the chamber 103 by a third valve seat 106, and a second pressure chamber that is partitioned from the outlet chamber 107 by a first diaphragm 108 and communicates with the first pressure chamber 105 via a communication passage 109. 110 and a communication path 111 communicating with the second pressure chamber 110, which is partitioned by a fourth valve seat 112, communicates with the outlet chamber 107 via the communication path 113 and is not illustrated in the first pressure chamber 105. A third pressure chamber 114 communicating with the first pressure chamber 114, a back pressure chamber 116 partitioned from the third pressure chamber 114 by a second diaphragm 115, and a valve body 117a for opening and closing a valve hole 102a formed in the first valve seat 102. Have The first solenoid valve 117, the second solenoid valve 118 having a valve body 118 a that opens and closes the valve hole 104 a formed in the second valve seat 104, and the first diaphragm 108 are connected to and separated from the third valve seat 106. A first diaphragm valve body 119 that freely opens and closes a valve hole 106 a formed therein, and a first diaphragm 108 that urges the first diaphragm 108 toward the lower closing side where the first diaphragm valve body 119 approaches the third valve seat 106. And a spring 120.

  The gas governor device 1 is connected to the second diaphragm 115, the fourth valve seat 112 that defines the third pressure chamber 114 between the second diaphragm 115, and the second diaphragm 115, and the fourth valve seat. 112, a second diaphragm valve body 121 that opens and closes a valve hole 112a that is formed on and away from the diaphragm 112, a diaphragm cover 122 that defines the back pressure chamber 116 on the back side of the second diaphragm 115, and a second diaphragm 115. The second diaphragm valve body 121 approaches the fourth valve seat 112, and the second diaphragm 123 biases the second diaphragm 115 to the upper open side separated from the fourth valve seat 112. Screwed into the pressure regulating spring 124 in the back pressure chamber 116 urging the lower closed side and the upwardly extending cylindrical portion 122 a provided in the diaphragm cover 122. And a regulating member 125 for adjusting the biasing force of the pressure control spring 124. The second diaphragm valve body 121 is integrally connected to the second diaphragm 115.

When both the first and second electromagnetic valves 117 and 118 are opened, gas flows from the inlet chamber 101 to the outlet chamber 107. Here, the pressure (primary pressure) of the inlet chamber 101 is P1, the pressure (secondary pressure) of the outlet chamber 107 is P2, the pressure of the second pressure chamber 110 is P3, the pressure of the back pressure chamber 116 is P4, and the first spring. The urging force of 120 is F1, the urging force of the second spring 123 is F2, the urging force of the pressure adjusting spring 124 is F4, the effective pressure receiving area of the first diaphragm 108 is Sa, and the area of the valve hole 106a of the third valve seat 106 is Sb, where Sc is the effective pressure receiving area of the second diaphragm 115 and Sd is the area of the valve hole 112a of the fourth valve seat 112, the first diaphragm 108 has a pressing force of P3 · Sa + P2 · Sb on the upper opening side. Acting, and the pressing force of P2 · Sa + P1 · Sb + F1 acts on the lower closing side. And because both pressing forces balance, the following formula:
P3 · Sa + P2 · Sb = P2 · Sa + P1 · Sb + F1 (1)
And the following equation from the equation (1):
P3 = P2 + (P1-P2) Sb / Sa + F1 / Sa (2)
Is obtained. Here, since Sb << Sa, it can be considered that Sb / Sa = 0.
P3 = P2 + F1 / Sa (3)
Is established.

Further, the second diaphragm 115 has a pressing force P2 · Sc + P3 · Sd + F2 on the upper opening side and a pressing force P4 · Sc + F3 on the lower closing side to balance both pressing forces. formula,
P2 · Sc + P3 · Sd + F2 = P4 · Sc + F3 (4)
Is established. Substituting (3) into (4) and rearranging, the following equation:
P2 · (Sc + Sd) = P4 · Sc + F3−F2 + F1 · Sd / Sa (5)
become. Here, since Sd << Sa and Sd << Sc, it can be considered that Sd / Sa = 0 and Sc + Sd = Sc.
P2 = P4 + (F3-F2) / Sc (6)
Is established. Therefore, if the biasing force of the pressure adjusting spring 124 is adjusted to be equal to the biasing force of the second spring 123, the secondary pressure P2 becomes equal to the pressure P4 of the back pressure chamber 116. In the present embodiment, since the back pressure chamber 116 is opened to the atmosphere through a hole 122b formed in the diaphragm cover 122, the pressure P4 in the back pressure chamber 116 becomes atmospheric pressure, and the secondary pressure P2 becomes atmospheric pressure. Maintained.

  By the way, even when the urging force of the pressure adjusting spring 124 is adjusted to be equal to the urging force of the second spring 123 by the adjusting member 125 at the time of factory shipment or the like, It moves only by the amount, and it may cause a deviation in pressure regulation. Therefore, an annular first anti-slip member 126 is interposed between the outer peripheral surface of the adjustment member 125 and the inner peripheral surface of the cylindrical portion 122a, and the movement of the adjustment member 125 after the adjustment of the first anti-slip member 126 It can be prevented by frictional force. In the present embodiment, the first anti-slip member 126 is configured by an O-ring that is attached to an annular groove 125 a formed on the outer peripheral surface of the adjustment member 125. The O-ring has a sealing function. The O-ring is in close contact with the outer peripheral surface of the adjustment member 125 and the inner peripheral surface of the cylindrical portion 122a, and the frictional force of the first anti-slip member 126 is reliably obtained.

  Further, random adjustment may be caused by randomly contacting the adjustment member 125. Therefore, in the present embodiment, a plug member 127 inserted into the outer end portion of the cylindrical portion 122a is provided so that the plug member 127 can prevent contact with the adjustment member 125. Since the plug member 127 can be easily attached to and detached from the outer end portion of the cylindrical portion 122a by pushing or pulling out, the attachment / detachment workability is improved. Furthermore, an annular second anti-slip member 128 is interposed between the outer peripheral surface of the plug member 127 and the inner peripheral surface of the outer end portion of the cylindrical portion 122a, and the plug member 127 is caused by the frictional force of the second anti-slip member 128. The cylindrical portion 122a is prevented from coming off at the outer end portion.

  The second anti-slip member 128 is composed of an O-ring mounted in an annular groove 127a formed on the outer peripheral surface of the plug member 127. As described above, the O-ring has a sealing function. The O-ring is in close contact with the outer peripheral surface of the stopper member 127 and the inner peripheral surface of the outer end portion of the cylindrical portion 122a, and the friction force of the second anti-slip member 128 is increased. It is definitely obtained.

  However, when air is contained between the adjustment member 125 and the plug member 127 by the sealing function of the first and second anti-slip members 126 and 128, the plug member is expanded when the air expands due to a temperature rise. 127 is pushed out from the outer end of the cylindrical portion 122a. Therefore, an air vent hole 127b is formed in the plug member 127 so that the expanded air can escape to the outside through the air vent hole 127b.

  Further, in the present embodiment, the annular groove 127a on the outer peripheral surface of the plug member 127 to which the O-ring 128 that is the second anti-slip member is attached is configured as a V-groove whose groove bottom is recessed in a V shape radially inward. ing. According to this, a deformation space inward in the radial direction of the O-ring 128 is secured, and the compression reaction force of the O-ring 128 is reduced. Therefore, the pushing force and pulling-out force when the plug member 127 is attached to and detached from the outer end portion of the cylindrical portion 122a are reduced, and the attachment / detachment workability of the plug member 127 is further improved.

  As mentioned above, although embodiment of this invention was described with reference to drawings, this invention is not limited to this. For example, each of the first and second anti-slip members 126 and 128 may be constituted by a dedicated seal member other than the O-ring, and each anti-slip member 126 and 128 is formed on the inner peripheral surface of the cylindrical portion 122a. It may be mounted in the annular groove. If at least one of the first anti-slip member 126 and the second anti-slip member 128 does not have a sealing function, the air vent hole 127b may not be formed in the plug member 127. Furthermore, although the said embodiment applies this invention to the gas governor apparatus 1 integrated in the zero governor 100, this invention is applicable similarly to the gas governor apparatus of another use.

DESCRIPTION OF SYMBOLS 1 ... Gas governor apparatus, 112 ... 4th valve seat (valve seat), 114 ... 3rd pressure chamber (pressure chamber), 115 ... 2nd diaphragm (diaphragm), 116 ... Back pressure chamber, 121 ... 2nd diaphragm valve body ( Valve body), 122 ... diaphragm cover, 122a ... cylindrical portion, 124 ... pressure adjusting spring, 125 ... adjusting member, 126 ... first anti-slip member, 127 ... plug member, 127a ... annular groove, 127b ... air vent hole, 128 ... Second anti-slip member.

Claims (3)

A diaphragm, a valve seat that defines a pressure chamber through which gas flows between the diaphragm, a valve body that is connected to the diaphragm and that can be contacted with and separated from the valve seat, and a back pressure that is partitioned by a diaphragm with respect to the pressure chamber The diaphragm cover that defines the chamber on the back side of the diaphragm, the pressure regulating spring in the back pressure chamber that urges the diaphragm, and the biasing force of the pressure regulating spring screwed into the cylindrical portion provided in the diaphragm cover are adjusted. In a gas governor device comprising an adjustment member,
An annular first anti-slip member is interposed between the outer peripheral surface of the adjustment member and the inner peripheral surface of the cylindrical portion,
A plug member inserted into the outer end portion of the cylindrical portion is provided, and an annular second anti-slip member is interposed between the outer peripheral surface of the plug member and the inner peripheral surface of the outer end portion of the cylindrical portion. Gas governor device to do.   The gas governor device according to claim 1, wherein the first and second anti-slip members have a sealing function, and an air vent hole is formed in the plug member. The second anti-slip member is composed of an O-ring attached to an annular groove formed on the outer peripheral surface of the stopper member, and the annular groove is a V-groove whose groove bottom is recessed in a V shape radially inwardly. The gas governor device according to claim 1 or 2, characterized by comprising:

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