JP6588309B2 - Gas governor - Google Patents

Description

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

  Conventionally, as this type of gas governor, a casing having a primary pressure chamber, a secondary pressure chamber above the primary pressure chamber, a valve seat between the primary pressure chamber and the secondary pressure chamber, and a lower surface of the primary pressure chamber And a governor valve having a valve body portion that is inserted through a valve hole formed in the valve seat and has an outer diameter gradually increasing upward, and the shaft portion of the governor valve extending from the valve body portion is connected to the diaphragm. In addition, there is known a system in which the governor valve is displaced through a diaphragm in accordance with the gas pressure fluctuation in the primary pressure chamber to suppress the gas pressure fluctuation in the secondary pressure chamber (for example, see Patent Document 1).

  By the way, a filter is installed in the upstream part of the gas supply path, but when foreign matter that has passed through the filter flows downstream through the gas governor, the nozzle is clogged, or the valve body of the downstream solenoid valve Foreign matter may adhere and cause valve leakage. Therefore, it is desired that at least a part of the foreign matter mixed in the gas can be collected by the gas governor, but such a gas governor has not been developed yet.

JP 2013-249874 A

  This invention makes it the subject to provide the gas governor which enabled the collection of at least one part of the foreign material mixed in gas in view of the above point.

In order to solve the above problems, the present invention provides a primary pressure chamber, a casing having a secondary pressure chamber above the primary pressure chamber, a valve seat between the primary pressure chamber and the secondary pressure chamber, and a primary pressure chamber. A diaphragm that covers the lower surface of the pressure chamber, and a governor valve that is inserted through a valve hole formed in the valve seat and has a valve body portion that gradually increases in outer diameter toward the upper side, and has a shaft portion of the governor valve that extends from the valve body portion. In a gas governor that is connected to a diaphragm and that controls the gas pressure fluctuation in the secondary pressure chamber by displacing the governor valve via the diaphragm according to the gas pressure fluctuation in the primary pressure chamber, the valve seat and the valve hole have the secondary pressure. The secondary pressure chamber is located on the outlet side of the chamber, and the secondary pressure chamber extends from the space directly above the valve seat in the opposite direction to the outlet of the secondary pressure chamber, and below the valve seat under the expansion space. It has the hollow part which becomes hollow, It is characterized by the above-mentioned.

  According to the present invention, the gas that flows from the primary pressure chamber to the secondary pressure chamber through the gap generated between the valve hole and the entire circumference of the valve body portion flows to the expansion space side immediately. Does not flow to the outlet and stays in the expansion space for a while. While the gas stays in the expansion space, the foreign matter mixed in the gas falls into the recessed portion and accumulates there. Therefore, a part of the foreign matter mixed in the gas can be collected by the gas governor.

Sectional drawing of the proportional valve apparatus with a governor comprised using the gas governor of 1st Embodiment of this invention. The perspective view of the state which removed the upper cover of the proportional valve apparatus with a governor of FIG.

  With reference to FIG. 1, A shows the proportional valve apparatus with a governor comprised using the gas governor of embodiment of this invention. This proportional valve device A is interposed in a gas supply path to the gas burner, and includes a primary pressure chamber 11, a secondary pressure chamber 12 positioned above the primary pressure chamber 11, a primary pressure chamber 11, and a secondary pressure chamber. A casing 1 having a valve seat 13 between the 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.

  The primary pressure chamber 11 communicates with the upstream portion of the gas supply path via an inlet 11a that opens to one side (right side in FIG. 1), and the secondary pressure chamber 12 communicates with the other side (FIG. 1 communicates with the downstream portion of the gas supply path via an outlet 12a that opens to the left side. Further, the upper surface of the secondary pressure chamber 12 is closed with an upper lid 15 attached to the casing 1.

  The proportional valve device A further includes a diaphragm 2 that covers the lower surface of the primary pressure chamber 11, a resin governor valve 3 that is connected to the diaphragm 2, and an electromagnetic solenoid 4 that presses the governor valve 3 upward. .

  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 presser 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.

  The governor valve 3 includes an umbrella-shaped valve body portion 31 that is inserted into the valve hole 14 and gradually increases in outer diameter toward the upper side, and a shaft portion 32 that extends from the valve body portion 31 and is connected to the diaphragm 2. ing. A small diameter shaft portion 32a projecting downward from a shoulder surface in contact with the upper surface of the diaphragm 2 is projected at the lower end portion of the shaft portion 32, and the valve holder is passed through a hole formed at the center of the diaphragm 2 with the small diameter shaft portion 32a. The governor valve 3 is connected to the diaphragm 2 by being fitted and fixed to 24. 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.

  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 contacts the lower end of the small-diameter shaft portion 32a of the governor valve 3 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, when the foreign matter mixed in the gas flows downstream of the gas governor A, the nozzle at the downstream end may be clogged, or foreign matter may adhere to the valve body of the downstream solenoid valve and cause valve leakage. is there. Therefore, the gas governor A of the present embodiment is configured to collect at least a part of the foreign matter mixed in the gas. This point will be described below with reference to FIG.

  The secondary pressure chamber 12 of the gas governor A of the present embodiment includes an expansion space 122 that extends from the space 121 directly above the valve seat 13 in the direction opposite to the outlet 12a of the secondary pressure chamber 12, that is, to the right in FIG. And a recess 123 that is recessed below the valve seat 13 below the valve seat 13.

  According to this, the expansion space 122 side of the gas flowing into the secondary pressure chamber 12 from the primary pressure chamber 11 through the gap generated between the valve hole 14 and the entire circumference of the valve body portion 31 of the governor valve 3. The material that has flowed into the expansion space 122 does not flow immediately to the outlet 12a but stays in the expansion space 122 for a while. Then, while the gas stays in the expansion space 122, the foreign matter mixed in the gas falls into the recessed portion 123 and accumulates there. Therefore, part of the foreign matter mixed in the gas can be collected by the gas governor A, and the occurrence of nozzle clogging and valve leakage can be suppressed.

  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 present invention is applied to a gas governor that constitutes a proportional valve device with a governor including the electromagnetic solenoid 4, but the present invention can be similarly applied to a normal gas governor that does not include the electromagnetic solenoid 4. .

DESCRIPTION OF SYMBOLS 1 ... Casing, 11 ... Primary pressure chamber, 12 ... Secondary pressure chamber, 12a ... Outlet, 121 ... Space immediately above, 122 ... Expansion space, 123 ... Depression part, 13 ... Valve seat, 14 ... Valve hole, 2 ... Diaphragm, 3 ... governor valve, 31 ... valve body part, 32 ... shaft part.

Claims (1)

A casing having a primary pressure chamber, a secondary pressure chamber above the primary pressure chamber, a valve seat between the primary pressure chamber and the secondary pressure chamber, a diaphragm covering the lower surface of the primary pressure chamber, and a valve seat A governor valve having a valve body portion that is inserted through the formed valve hole and has an outer diameter gradually increasing upward, and the shaft portion of the governor valve extending from the valve body portion is connected to the diaphragm to change the gas pressure in the primary pressure chamber. In accordance with the gas governor in which the governor valve is displaced via the diaphragm to suppress the gas pressure fluctuation in the secondary pressure chamber,
The valve seat and the valve hole are located in a position biased toward the outlet side of the secondary pressure chamber, and the secondary pressure chamber extends from the space immediately above the valve seat in the direction opposite to the outlet of the secondary pressure chamber, and the expansion space A gas governor comprising: a recessed portion that is recessed below the valve seat.

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