JP6599676B2 - Proportional valve with governor - Google Patents

Description

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

  Conventionally, as this kind of proportional valve with a governor, there is a casing having a primary pressure chamber, a secondary pressure chamber, and a valve seat between the primary pressure chamber and the secondary pressure chamber, and a primary valve on the opposite side of the valve seat. Connected to the diaphragm facing the pressure chamber, the valve body that is inserted through the valve hole formed in the valve seat, and whose outer diameter gradually increases toward the end of the secondary pressure chamber, and extends from the valve body A governor valve having a shaft portion and an electromagnetic solenoid disposed on the opposite side of the primary pressure chamber with the diaphragm interposed therebetween, and the governor valve is displaced via the diaphragm in accordance with the gas pressure fluctuation in the primary pressure chamber, It is known that the gas pressure fluctuation in the secondary pressure chamber is suppressed, and that the pressing force to the open side proportional to the energization current to the solenoid solenoid coil is applied to the governor valve via the solenoid solenoid plunger. (For example, Patent reference 1).

  By the way, in a governor equipped with a governor valve connected to a diaphragm, the governor valve may vibrate due to an external impact or the like, and the valve body portion may collide with the valve seat, resulting in a so-called governor noise. This also applies to the proportional valve with governor. Conventionally, although it is a normal governor that is not a proportional valve with a governor, according to Patent Document 2, an axially movable weight is extrapolated to the shaft portion of the governor valve, and the axial vibration of the governor valve is reversed in phase with the weight. A device that suppresses governor noise by damping with vibration is known.

  However, in this case, wear powder is generated due to sliding contact of the weight with respect to the shaft portion of the governor valve, and this wear powder may adhere to the valve body portion and the valve seat of the governor valve, and the gas pressure control may become unstable. .

JP 2013-249874 A JP-A-6-159654

  In view of the above points, an object of the present invention is to provide a governor-equipped proportional valve capable of suppressing governor noise without generating wear powder.

In order to solve the above problems, the present invention provides a casing having a primary pressure chamber, a secondary pressure chamber, a valve seat between the primary pressure chamber and the secondary pressure chamber, and a valve seat on the opposite side. A diaphragm that faces the primary pressure chamber, a valve body that is inserted through a valve hole formed in the valve seat and has an outer diameter that gradually increases toward the end of the secondary pressure chamber, and extends from the valve body to the diaphragm A governor valve having a shaft portion to be connected, and an electromagnetic solenoid disposed on the opposite side of the primary pressure chamber across the diaphragm, and the governor valve is displaced via the diaphragm in accordance with a gas pressure fluctuation in the primary pressure chamber. A proportional valve with a governor that suppresses gas pressure fluctuations in the secondary pressure chamber and applies a pressing force to the governor valve on the open side in proportion to the energization current to the coil of the electromagnetic solenoid via the solenoid solenoid plunger. And Gabba The shaft portion of the valve, the primary pressure chamber of the diaphragm is projected the small-diameter shaft portion protruding on the opposite side, in which the plunger in the small-diameter shaft portion is opposed, between the small-diameter shaft portion and the plunger, A damping rubber is interposed to suppress the governor squeaking that occurs when the valve body collides with the valve seat due to the vibration of the governor valve , and this damping rubber has an end surface and a peripheral surface of the end portion near the plunger of the small diameter shaft portion. A stepped portion that is formed in a cap shape and is attached to the end of the small-diameter shaft, and engages with a groove formed on the outer peripheral surface of the small-diameter shaft on the inner periphery of the end opposite to the plunger of the damping rubber There is formed, characterized in Rukoto.

  According to the present invention, the axial vibration (vertical vibration) of the governor valve is attenuated by the action of the damping rubber, and the radial vibration (lateral vibration) of the governor valve is also attenuated by the frictional force of the damping rubber. Therefore, the governor squeaking caused by the vertical shake and the horizontal shake of the governor valve can be effectively suppressed. In the present invention, since the weight as in the conventional example is not used, wear powder is not generated, and it is ensured that the wear powder adheres to the valve body portion and the valve seat of the governor valve and gas pressure control becomes unstable. Can be prevented.

Although it is conceivable to attach the damping rubber to the end face of the plunger, in this case, the damping rubber may be peeled off due to deterioration of the adhesive when used to some extent. On the other hand, if the damping rubber formed in a cap shape covering the end face and the peripheral surface of the small diameter shaft portion is attached to the end portion of the small-diameter shaft portion as described above , the damping rubber falls off due to deterioration of the adhesive. This is advantageous because it does not cause such problems.

Sectional drawing of the proportional valve with a governor of embodiment of this invention. FIG. 2 is an enlarged cross-sectional view of a portion surrounded by a circle A in FIG. 1.

  The proportional valve with governor of the embodiment of the present invention shown in FIG. 1 is provided in a gas supply path to the gas burner, and includes a lower primary pressure chamber 11 communicating with the gas inlet 11a and a gas outlet 12a. A casing 1 having an upper secondary pressure chamber 12 communicating with the primary pressure chamber 11 and a valve seat 13 intermediate the primary pressure chamber 11 and the secondary pressure chamber 12 is provided. A valve hole 14 for connecting the primary pressure chamber 11 and the secondary pressure chamber 12 is formed in the valve seat 13.

  Further, the proportional valve has a diaphragm 2 facing the primary pressure chamber 11 on the lower side opposite to the valve seat 13, a resin governor valve 3 connected to the diaphragm 2, and an electromagnetic for pressing the governor valve 3 upward. And a solenoid 4.

  The outer peripheral portion of the diaphragm 2 is clamped and fixed to the outer peripheral portion of the lower surface of the primary pressure chamber 11 by a pressing plate 21 fastened to the lower surface of the casing 1. A back pressure chamber 22 that is opened to the atmosphere is defined between the diaphragm 2 and the presser plate 21. A cylindrical valve holder 24 having an upper flange portion 24 a that is in contact with the lower surface of the diaphragm 2 via a washer 23 is provided on the lower side of the diaphragm 2. As clearly shown in FIG. 2, the valve holder 24 has a plurality of peripheral slits 24b extending upward from the lower end, and a claw portion 24c protruding radially inward is formed on the inner peripheral surface of the lower end portion. Yes.

  The governor valve 3 is inserted into the valve hole 14 and extends from the valve body portion 31 to an end portion on the secondary pressure chamber 12 side, that is, an umbrella-shaped valve body portion 31 whose outer diameter gradually increases toward the upper end portion. And a shaft portion 32 connected to the diaphragm 2. A small-diameter shaft portion 32 a that protrudes downward from a shoulder surface that is in contact with the upper surface of the diaphragm 2 projects from the lower end portion of the shaft portion 32. As clearly shown in FIG. 2, a groove 32b is formed on the outer peripheral surface of the small diameter shaft portion 32a. The shaft portion 32 extends not only downward from the valve body portion 31 toward the diaphragm 2 but also upward from the valve body portion 31.

  During assembly, the small-diameter shaft portion 32a is inserted into the valve holder 24 from above through a hole formed in the center of the diaphragm 2. At this time, when the lower end of the small-diameter shaft portion 32a comes into contact with the claw portion 24c of the valve holder 24, the slit 24b is opened, the diameter of the valve holder 24 is elastically expanded, and the groove portion 32b is adjusted to a height that matches the claw portion 24c. When it reaches, the diameter of the valve holder 24 is reduced, and the claw portion 24c is engaged with the groove portion 32b. As a result, the governor valve 3 is connected to the diaphragm 2.

  The electromagnetic solenoid 4 is inserted into a yoke 41 attached to the lower surface of the holding plate 21, a coil 43 wound around a bobbin 42 in the yoke 41, and a cylindrical guide 44 on the inner periphery of the yoke 41 so as to be movable in the vertical direction. A plunger 45 and a spring 46 that urges the plunger 45 upward to cancel the weight of the plunger 45 are provided. The plunger 45 abuts on the lower end of the small-diameter shaft portion 32a of the governor valve 3 via a damping rubber 5 described later, and presses the governor valve 3 upward with a pressing force proportional to the value of the current supplied to the coil 43.

  Here, as the current value is increased, the governor valve 3 is displaced to the opening side, and the gap (opening) between the peripheral surface of the valve hole 14 and the valve body portion 31 is increased, and the inside of the secondary pressure chamber 12 is increased. Gas pressure increases. Therefore, the amount of gas supplied to the gas burner changes in proportion to the current value. Further, when the gas pressure in the primary pressure chamber 11 fluctuates, the governor valve 3 is displaced through the diaphragm 2 and the opening degree changes so as to absorb the gas pressure fluctuation, and the gas pressure fluctuation in the secondary pressure chamber 12 changes. Is suppressed. Therefore, even if the gas pressure fluctuation in the primary pressure chamber 11 occurs, the gas pressure in the secondary pressure chamber 12 is maintained at a predetermined pressure corresponding to the current value.

  By the way, an external impact or the like causes the governor valve 3 to generate axial vibration (vertical vibration) or radial vibration (lateral vibration), and the valve body 31 collides with the valve seat 13 to cause the governor. May cause noise.

  In the present embodiment, in order to suppress such governor squealing due to vertical and lateral vibrations, a small diameter that is an end portion of the shaft portion 32 of the governor valve 3 that protrudes from the surface opposite to the primary pressure chamber 11 of the diaphragm 2. A damping rubber 5 is interposed between the shaft portion 32 a and the plunger 45. The material of the damping rubber 5 is preferably nitrile rubber (NBR) or natural rubber (NR).

Here, it is possible to adhere the damping rubber to the upper end surface of the plunger 45 facing the small-diameter shaft portion 32a. However, if the rubber is used to some extent, the damping rubber may be peeled off due to deterioration of the adhesive. Therefore, in the present embodiment, the damping rubber 5 formed in a cap shape that covers the lower end surface and the peripheral surface of the small diameter shaft portion 32a near the plunger 45 is attached to the small diameter shaft portion 32a. According to this, there is no problem that the damping rubber 5 falls off due to deterioration of the adhesive. The damping rubber 5 is formed so as to cover the circumferential surface of the small-diameter shaft portion 32a from the lower end to the intermediate portion in the vertical direction of the groove portion 32b, and in the upper end portion that is the inner circumference of the end portion of the damping rubber 5 opposite to the plunger 45 . A step portion 51 that engages with the groove portion 32b is provided on the periphery.

  If the damping rubber 5 is provided as described above, the vertical vibration of the governor valve 3 is attenuated by the action of the damping rubber 5 and the lateral vibration of the governor valve 3 is also caused by the frictional force of the damping rubber 5 against the plunger 45 (the damping rubber 5 is replaced with the plunger 45). Is attached by the frictional force of the damping rubber 5 against the small diameter end portion 32a. Therefore, it is possible to effectively suppress the governor squeaking caused by the vertical vibration or the horizontal vibration of the governor valve 3. Unlike the conventional example in which a weight is extrapolated to the shaft portion 32, no wear powder is generated, and the wear powder adheres to the valve body 31 and the valve seat 13 of the governor valve 3 and gas pressure control is unstable. Can be surely prevented.

  As mentioned above, although embodiment of this invention was described with reference to drawings, this invention is not limited to this. For example, in the above embodiment, the primary pressure chamber 11 is located below the secondary pressure chamber 12, the diaphragm 2 is disposed on the lower surface of the primary pressure chamber 11, and the electromagnetic solenoid 4 is disposed below the primary pressure chamber 11. It is also possible to arrange a diaphragm on the upper surface of the primary pressure chamber and an electromagnetic solenoid above it.

  DESCRIPTION OF SYMBOLS 1 ... Casing, 11 ... Primary pressure chamber, 12 ... Secondary pressure chamber, 13 ... Valve seat, 14 ... Valve hole, 2 ... Diaphragm, 3 ... Governor valve, 31 ... Valve body part, 32 ... Shaft part, 32a ... Small diameter shaft 4 (electromagnetic solenoid), 43 ... coil, 45 ... plunger, 5 ... damping rubber.

Claims (1)

A casing having a primary pressure chamber, a secondary pressure chamber, a valve seat between the primary pressure chamber and the secondary pressure chamber, a diaphragm facing the primary pressure chamber on the opposite side of the valve seat, and a valve seat A governor valve having a valve body portion inserted through the formed valve hole and having an outer diameter gradually increased toward the end on the secondary pressure chamber side, and a shaft portion extending from the valve body portion and coupled to the diaphragm, and a diaphragm And an electromagnetic solenoid disposed on the opposite side of the primary pressure chamber, and the governor valve is displaced via the diaphragm in accordance with the gas pressure fluctuation in the primary pressure chamber to suppress the gas pressure fluctuation in the secondary pressure chamber. In addition, a proportional valve with a governor that causes a pressing force to open on the governor valve to the opening side in proportion to the energization current to the coil of the electromagnetic solenoid is applied via the plunger of the electromagnetic solenoid ,
In the shaft portion of the governor valve, a small-diameter shaft portion protruding on the surface opposite to the primary pressure chamber of the diaphragm is projected, and the plunger faces this small-diameter shaft portion .
Between the small-diameter shaft portion and the plunger, the valve body in the vibration of Gabanabarubu is attenuated rubber interposed in order to suppress the governor sound generated by colliding with the valve seat, the damping rubber, the small diameter portion the plunger It is formed in the shape of a cap that covers the end face and peripheral surface of the near end, and is attached to the end of the small-diameter shaft, and the outer peripheral surface of the small-diameter shaft on the inner periphery of the end opposite to the plunger of the damping rubber governor with proportional valve, characterized in Rukoto the step portion is formed to be engaged with the groove formed in the.

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