JP4592626B2 - Gas valve device - Google Patents

Description

  The present invention relates to a gas valve device that controls supply of gas to a gas burner.

  A conventional gas valve device of this type is connected to a gas burner connected to a downstream side of an opening / closing part comprising a safety valve that is held open during ignition of the gas burner, and an opening / closing valve provided downstream of the safety valve. And a thermal power control unit that adjusts the amount of gas supplied (see, for example, Patent Document 1).

  Referring to FIG. 4, this type of opening / closing portion includes a bottomed space 101 in a housing 100 made of aluminum die cast. The gas flows into the space 101 from the gas inlet 102, and the gas flows out from the gas outlet 103 to the thermal power control unit (not shown). A safety valve unit 104 is built in the space 101. The safety valve unit 104 has a valve body 105 biased in a protruding direction, and is assembled in the housing 100 with an O-ring 118 attached. In the space 101, a resin holder member 106 is provided with a locking claw 117 that is locked to the gas inlet, and is held by the housing 100. A first valve port 107 is formed in the holder member 106, and the first valve port 107 is opened and closed by the valve body 105 of the safety valve unit 104. In the state where the first valve port 107 is closed by the valve body 105, an O-ring 108, which is an annular seal, is provided so that the gas does not leak downstream through the space between the guide member 106 and the inner wall surface of the space 101. It is attached.

  Reference numeral 109 denotes a rod that is pushed leftward in the figure by an ignition operation. When the rod 109 is pushed, the valve body 105 is pushed to forcibly open the first valve port 107. If the ignition state of the gas burner is maintained in this state, the valve body 105 is held in the open state by the electromagnet built in the safety valve unit 104, and when the gas burner is extinguished, the valve body 105 protrudes by the biasing force of the spring. Then, the first valve port 107 is closed.

  A rubber valve body 110 is attached to the middle position of the rod 109. The valve body 110 closes the second valve port 116 by sitting on a valve seat portion 111 formed at the bottom. The rod 109 is urged to the right in the figure by the coil spring 112. When the holding mechanism (not shown) that holds the rod 109 in the illustrated valve opening position is released, the urging force of the coil spring 112 is released. As a result, the valve body 110 is seated on the valve seat 111.

Although the coil spring 112 is contracted between the valve body 110 and the holder member 106, the valve body 110 is made of rubber and is relatively soft, so the washer 113 is attached to the rod 109. The holder member 106 is integrally formed with a frustoconical guide portion 114 that guides the movement of the rod 109. An opening 115 for allowing gas to pass therethrough is provided on the slope of the guide portion 114.
Japanese Patent Laid-Open No. 7-332656 (FIG. 1)

  In the above conventional opening / closing part structure, the housing 100 is made of aluminum die cast, but the valve seat part 111 on which the valve body 110 attached to the rod 109 is seated is required to have surface roughness, so that it is machined. There is a need. Specifically, a rotating tooth tool such as an end mill is inserted into the space 101 to perform counterbore processing. However, since the valve seat portion 111 is in a recessed position in the space 101, the feeding time of the rotating tooth tool It takes a long time to process, and the processing cycle is long, making it difficult to increase productivity. In addition, since the housing 100 is made of die-casting, if the burrow is exposed on the surface of the valve seat portion 111 as a result of spot facing, the housing cannot be used and the yield is poor. There is a bug.

  Then, this invention makes it a subject to provide the gas valve apparatus which does not produce said malfunction in view of said problem.

In order to solve the above problems, a gas valve device according to the present invention includes a bottomed space in a die-cast housing, and an on-off valve that opens and closes a second valve port opened at the bottom of the space. A holder member, which is located upstream of the second valve port and has a first valve port through which gas to the second valve port is formed, is inserted into the space, and a safety valve that opens and closes the first valve port is housed In this gas valve device, a rubber valve seat member disposed at the bottom of the space and surrounding the second valve port, and an outer peripheral surface of the holder member and an inner wall surface of the space are always in close contact with each other. A rubber ring that seals both the gas flow that bypasses the first valve port and the gas flow that bypasses the second valve port, which is disposed in a compressed state. The sealing member is integrally formed.

  By adopting the above configuration, the valve seat member and the seal member are integrally formed, so that the number of parts is reduced.

  A valve body that is seated on the valve seat member and closes the second valve port is formed integrally with a rod for forcibly opening the safety valve, and the rod is mounted in a direction in which the valve body is seated on the valve seat member. If the coil spring to be urged is contracted between the back portion of the valve body and the holder member, a washer that is necessary in the conventional configuration is not necessary.

  A slit that guides the movement of the rod with a cylindrical guide portion extending downstream from the first valve port, positions the coil spring on the outer peripheral surface of the guide portion, and further allows gas to pass through the cylindrical portion of the guide portion. If the window hole is formed, the positioning of the coil spring is increased, and the coil spring can be easily attached. In addition, the gas flow is not hindered by forming the window hole.

  As is apparent from the above description, in the present invention, since the seal member and the valve seat member are integrally formed, the valve seat member is attached to the holder member on the outside of the housing together with the seal member, and in this state, the holder member is attached to the housing. By inserting into the space, the valve seat member can be easily attached to the bottom of the space. By adopting the valve seat member, no counterbore processing is required, so that a long time is not required for processing and a burrow or the like is not exposed, thereby improving the yield.

  Referring to FIG. 1, reference numeral 1 denotes a gas valve device according to the present invention. The gas valve device 1 is configured such that gas flows from an inlet 11 and gas is ejected from an outlet 12 to which a nozzle (not shown) is attached.

  Reference numeral 2 denotes an opening / closing part, which normally closes the gas passage and shuts off the gas, but when the point-off button 13 is pushed, the gas passage is opened and the gas is adjusted through the communication pipe 31 to control the heating power. The unit 3 is configured to flow. A thermal power adjusting lever 32 is attached to the thermal power adjusting unit 3, and the amount of gas ejected from the outlet 12 can be adjusted by swinging the lever 32 in the left-right direction.

  When the point-extinguishing button 13 is pushed at the time of ignition as described above, the push-push mechanism 14 holds the opening / closing portion 2 in the open state, and when the point-extinguishing button 13 is pushed next, the push-push mechanism 14 The holding is released, and the opening / closing part 2 is again in a state of blocking the gas passage. Reference numeral 15 denotes an ignition switch which is turned on when the fire extinguishing button 13 is pushed in and operates an ignition device (not shown) to ignite the gas burner.

  Referring to FIG. 2, reference numeral 21 denotes an aluminum die-cast housing. A bottomed space 22 is formed in the housing 21. In this space 22, a gas inlet 23 that communicates with the inlet 11 and a gas outlet 24 that communicates with the communication pipe portion 31 are provided. Reference numeral 25 denotes a safety valve unit that can be kept open by energization from the outside. The safety valve unit 25 is provided with a retractable valve body 26 that is urged rightward in the drawing. .

  The safety valve unit 25 is held by a resin holder member 4. The holder member 4 is provided with a first valve port 41, and the first valve port 41 is configured to be opened and closed by the valve body 26 of the safety valve unit 25. A cylindrical guide portion 42 that guides the rod 5 is formed on the downstream side of the first valve port 41. Referring also to FIG. 3, the cylindrical guide portion 42 is formed with a slit-like window hole 43 that is connected to the first valve port 41 and extends in the axial direction. Therefore, when the valve body 26 is retracted and the first valve port 41 is opened, the gas flows downstream through the first valve port 41 and the window hole 43. Reference numeral 25a denotes an O-ring that prevents gas leakage from the rear of the safety valve unit 25.

  The guide portion 42 guides the rod 5 and also positions the coil spring 6 at the same time. The coil spring 6 is contracted between the valve body 51 formed integrally with the rod 5 and the holder member 4 at an intermediate position of the rod 5. In addition, if comprised in this way, the coil spring 6 will obstruct | occlude a part of 1st valve port 41, However Since the window hole 43 is provided as mentioned above, it does not inhibit the flow of gas.

  A rubber composite seal 7 was attached to the tip of the holder member 4. This composite seal 7 prevents leakage of gas transmitted between the valve seat 71 for closing the second valve port 7a and the holder member 4 and the inner wall surface of the space 22 when the valve body 51 abuts. An annular seal portion 72 is integrally formed.

  Since this composite seal 7 is inserted in the space 22 together with the holder member 4 in a state where it is mounted on the tip of the holder member 4 in advance, even if the diameter of the space 22 is narrow and deep, the composite seal 7 can be simplified. And can be securely attached to the state shown in the figure.

  In addition, this invention is not limited to an above-described form, You may add a various change in the range which does not deviate from the summary of this invention.

The figure which shows the structure of one embodiment of this invention Sectional drawing which shows the structure of the opening-closing part by this invention III-III cross section Sectional view showing the structure of a conventional opening / closing part

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Gas valve apparatus 2 Opening / closing part 3 Thermal power adjustment part 4 Holder member 5 Rod 41 1st valve port 51 Valve body 6 Valve body part 7 Composite seal 71 Valve seat part 72 Seal part 7a 2nd valve port

Claims (3)

A die-cast housing is provided with a bottomed space, and an on-off valve for opening and closing the second valve port opened at the bottom of the space is disposed, and the second valve port is located upstream from the second valve port. In a gas valve device in which a holder member in which a first valve port through which gas passes is inserted is inserted into the space, and a safety valve for opening and closing the first valve port is housed, the holder is disposed at the bottom of the space. The rubber valve seat member surrounding the second valve port, and the outer peripheral surface of the holder member and the inner wall surface of the space are disposed in a compressed state so as to always adhere to both surfaces, and characterized by forming a seal member of rubber annular sealing both the flow of bypass gases flow and second valve port of the gas to bypass the first valve port along the between the integral Gas valve device.   The valve body that is seated on the valve seat member and closes the second valve port is formed integrally with the rod that forcibly opens the safety valve, and the rod is biased in the direction in which the valve body is seated on the valve seat member. The gas valve device according to claim 1, wherein a coil spring to be contracted is contracted between a back portion of the valve body and the holder member.   A slit that guides the movement of the rod with a cylindrical guide portion extending downstream from the first valve port, positions the coil spring on the outer peripheral surface of the guide portion, and further allows gas to pass through the cylindrical portion of the guide portion. The gas valve device according to claim 2, wherein a shaped window hole is formed.

Images