JP3756252B2 - Safety valve for combustion equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a safety valve for combustion equipment using combustion gas or oil as fuel, and a valve device including the safety valve.
[0002]
[Prior art]
As shown in FIG. 6, a combustion device such as a table stove is opened by operation of the point / fire extinguishing mechanism 100, and maintains an open state while combustion is detected by a misfire sensor (ignition sensor). A safety valve 4 is provided. The safety valve 4 is connected to the through hole 11 that forms part of the combustion gas flow path provided in the valve body 1 by operating the point / fire extinguishing mechanism 100 provided on one end side of the valve body 1. 11 is opened by driving the valve element 40 of the safety valve 4 provided at the other end of the valve 11.
[0003]
In the safety valve 4, the valve body is attracted to the electromagnetic actuator 7 by the output of the misfire sensor that detects combustion of the burner or the normal combustion signal output from the misfire sensor, and the valve is maintained in the open state. Further, when the misfire or abnormal combustion occurs, the electromagnetic force to be attracted is lost, so the valve is closed by the spring force of the spring 44 provided in the valve body 40, and the supply of the combustion gas is stopped.
[0004]
As shown in FIG. 7, a casing 70 in which one end portion of the electromagnetic actuator 7 that attracts the valve body 40 is fitted in the end portion of the through hole 11, and the valve body 40 that is installed on one end side of the casing 70 and opens and closes the valve port. And an electromagnetic solenoid 71 installed in the casing 70 for sucking the suction body 41 of the valve body 40, and a flange 97 fixed to the outer periphery of the casing 70 and fastened to the end face of the valve body 1. The casing 70 is a resin holder in which a can body 8 made of a metal plate having a valve body 40 attached to one end side so as to be freely displaceable in an axial direction and a connector 72 for energizing an electromagnetic solenoid 71 is fixed to the other end side. 9 is connected.
[0005]
The valve body 40 includes a valve plate 42 located outside the can body 8, a suction body 41 included in the can body 8, and a connecting rod 45 for connecting them. The electromagnetic solenoid 71 includes an iron core (core) 73 held by the holder 9 and an electromagnetic coil 76 wound around the iron core 73, and the electromagnetic coil 76 is connected to the electrode 79 of the connector 72.
[0006]
In the conventional electromagnetic actuator 7, the iron core 73 of the electromagnetic solenoid 71 is fixed to one end side of the holder 9, and a flange 97 is provided on the outer periphery of the other end of the holder 9. For this reason, in the conventional electromagnetic actuator 7, the length L of the portion inserted into the through hole 11 provided in the valve body 1 is long, and as a result, the through hole 11 of the valve body 1 that accommodates the safety valve 4 is long. .
[0007]
[Problems to be solved by the invention]
For this reason, the castability of the valve body 1 is poor, and when the valve seat or the like is cut, there is a problem that the sealability of the seal surface is impaired due to pores or the like generated during casting. In particular, in the valve device in which the original valve is provided on the downstream side of the through hole 11, the through hole 11 becomes long, which causes a problem of deterioration in castability.
An object of the present invention is to provide a safety valve for a combustion device that can reduce the length of a through hole and improve the castability of a valve body.
[0008]
[Means for Solving the Problems]
According to the present invention, a valve body having a through hole constituting a part of a combustion gas flow path, a valve opening of a safety valve provided in the through hole, and one end portion are fitted into an end portion of the through hole. A casing, a movable valve body installed at one end of the casing for opening and closing the valve port, an electromagnetic solenoid installed behind the casing for sucking the suction body of the valve body, and fixed to the outer periphery of the casing In a safety valve for a combustion device including an electromagnetic actuator having a flange fastened to an end face of the valve body, the electromagnetic solenoid is arranged on the inner side or the other end side of the flange.
[0009]
Operation and effect of the invention
According to the first or second aspect of the invention, the other end of the through hole that accommodates the electromagnetic actuator can be shortened, and the diameter of the holder can be increased. For this reason, the castability of the valve body can be improved, and generation of defective products due to hot water wrinkles, pores (nests generated inside the cast product), peeling of the surface during die cutting, and the like can be reduced. As a result, it is possible to reduce a problem that a seal failure occurs on the contact surface of the safety valve or the contact surface of the original valve. Further, since the holder has a large diameter, it is easy to assemble an electromagnetic actuator, a safety valve case, and the like. In addition, since the entire length of the valve is shortened, a sufficient space is obtained in the assembly space, and an inflow path for combustion air (primary air and secondary air) can be secured.
[0010]
In the configuration according to claim 3, the safety valve is fitted with a cylindrical safety valve case provided with a safety valve hole on one end side and an inflow port for introducing combustion gas in the can cylinder portion of the casing. I wear it. With this configuration, it is easy to form the safety valve hole and attach the cylindrical safety valve case to the through hole.
[0011]
According to a fourth aspect of the present invention, the electromagnetic solenoid holding portion of the holder is potted. In this configuration, the holding of the coil by the holder can be improved by incorporating the coil portion in the holder. Moreover, since the inside of the holder is potted, it is possible to prevent intrusion of dust and cutting waste during assembly and improve the quality.
[0012]
In the structure of Claim 5, the outflow port which cross | intersects this through hole is formed in the one end side of the said through hole, and the inflow port crossing this through hole is provided in the other end side of the said through hole, The said safety valve The valve port of the main valve is formed on the downstream side of the valve port, and the operation means for the safety valve and the main valve is provided on one end side of the valve body. In this structure, since the through hole becomes longer by the space of the main valve, casting defects are likely to occur. For this reason, the effect by which the other end part of the through-hole which accommodates the electromagnetic actuator of this invention can be shortened is still more remarkable.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a combustion control unit U including a point / fire extinguishing mechanism (operating means) 100 of a stove burner B (shown in FIGS. 2 and 3), a heating power increasing / decreasing mechanism 200, and a heating power adjusting mechanism 300 at the time of ignition. The combustion control unit U is mounted inside the table stove T shown in FIG. A point / fire extinguishing button 10 for operating the point / fire extinguishing mechanism 100 is attached to the front surface of the table stove T so as to be oscillated forward and backward by a spring (not shown).
[0014]
Above the point / fire extinguishing button 10, a slide type operation knob 20 for operating the heating power increasing / decreasing mechanism 200 is slidable in the left-right direction. 2 and 3, the slide position of the slide type operation knob 20 is low thermal power at the right end, medium thermal power at the middle, and high thermal power at the left end.
[0015]
As shown in FIGS. 1 and 2, the point / fire extinguishing mechanism 100 includes a cylindrical valve body 1 that is horizontally attached in the front-rear direction. A thermal power adjusting valve body 2 of the thermal power increasing / decreasing mechanism 200 is vertically fastened to the upper surface of the front portion (right side in the drawing) of the valve body 1. The thermal power control valve body 2 has a cylindrical shape, and a thermal power control valve 21 is provided at the upper end portion of the lumen serving as a gas flow path.
[0016]
The valve body 1 is provided with a through hole 11, and a switch mechanism 3 that is operated by a point / fire extinguishing button 10 shown in FIGS. 2 and 3 is fastened to one end side (the left end side in the drawing) of the valve body 1. Yes. An electromagnetic safety valve 4 is provided at the other end of the valve body 1.
[0017]
An operation lever 22 for operating the heating power adjustment valve 21 and adjusting the heating power of the stove burner B is attached to the upper end of the heating power adjustment valve body 2 so as to be rotatable in the left-right direction. In this embodiment, the operating lever 22 is rotatably supported by a fulcrum on the upper wall surface of the box-shaped bracket 23 fastened to the upper end surface of the thermal power regulating valve body 2. A slide operation knob 20 is fixed to the front end portion of the operation lever 22.
[0018]
The switch mechanism 3 is fastened to the front end surface of the valve body 1 by screws, and forms a guide frame 31 that forms a substantially cross-shaped guide surface, and an actuator 32 that is fitted in the guide frame 31 so as to be movable back and forth. Prepare. The actuator 32 has a substantially cross-shaped front surface, and has a rod-shaped base portion 33, a wing-shaped lever action portion 34 projecting upward from the rod-shaped base portion 33, and projecting laterally from the rod-shaped base portion 33. A microswitch operating unit 35 is provided.
[0019]
The operating element 32 is urged forward (leftward in the figure) by a spring 37 interposed between the operating frame 32 and the guide frame 31. A micro switch (not shown) is attached to the left side surface of the guide frame 31 and opens and closes as the micro switch operating portion 35 is displaced. When the operating element 32 is pushed in from the protruding position (fire extinguishing position) shown in FIGS. 1 and 2, the operating element 32 reaches the pushing position (ignition position) shown by a broken line in FIG. When the push is released in this state, it is locked at an intermediate position (combustion position) by a push-push mechanism P using a heart cam or a deformed heart cam (not shown), and when pushed again from the intermediate position, it returns to the original protruding position (fire extinguishing position).
[0020]
In the through hole 11 of the valve body 1, an operating rod 50 whose tip is in contact with the tip (right end in the figure) of the rod-shaped base 33 of the operating element 32 is inserted so as to be movable back and forth. The front end portion 1A of the through hole 11 is formed with a small diameter, the front end portion of the operating rod 50 is slidably fitted in the axial direction, and a seal member is interposed on the fitting surface. The intermediate portion 1B is formed with a front portion having a diameter and a rear portion having a large diameter via a step wall 12 to form a gas passage, and a main valve 5 is provided.
[0021]
The rear end portion 1C of the through hole 11 is formed to be somewhat larger in diameter than the rear portion of the intermediate portion 1B, and serves as a mounting portion for the safety valve 4. An inflow port 13 having a circular opening at the bottom is provided at the front portion (left portion in the drawing) of the rear end portion 1C, and an outflow port 14 that is open at the front portion of the intermediate portion 1B and communicates with the thermal power control valve body 2. Is formed to form part of the gas flow path.
[0022]
The main valve 5 includes a rubber main valve plate 52 attached to a groove 51 formed in the middle of the operating rod 50, a return spring 54 disposed on the main valve plate 52 via a metal back plate 53, The main valve port 55 is provided on the step wall 12. The rear end of the return spring 54 is supported in contact with the front end surface of a safety valve case 6 described later. The operating rod 50 is biased forward by a return spring 54 and is displaced in the front-rear direction in conjunction with the operating element 32.
[0023]
As shown in FIGS. 1 and 4, the safety valve 4 includes a resin cylindrical safety valve case 6 fitted into the rear end portion 1 </ b> C of the through hole 11, an electromagnetic actuator 7 with a tip portion fitted into the safety valve case 6, and It comprises a safety valve body 40 provided on the tip (one end) side of the electromagnetic actuator 7.
[0024]
The safety valve case 6 is integrally formed by injection molding of a resin such as polyacetal (POM) or nylon (PA) as shown in FIGS. 5A to 5C, and the other end (the right end in the figure) is opened. And a cylindrical portion 62 provided with an opening 61 at a portion corresponding to the inlet 13. On one end side of the cylindrical portion 62, an end side wall 64 with a safety valve port 63 opened at the center is formed.
[0025]
On the outer periphery of the side wall 64, an O-ring groove is formed and an O-ring 65 is fitted. A cage-shaped shaft support portion 66 extends from one end surface of the side wall 64, and a shaft support hole 67 for slidably supporting the other end portion of the operating rod 50 is coaxially provided at the tip of the shaft support portion 66. Is formed.
[0026]
As shown in FIG. 4, the electromagnetic actuator 7 has a casing 70 on one end side of which a valve body 40 is attached so as to be freely displaceable in the axial direction. The casing 70 is formed by connecting a can body 8 in which a suction body 41 of the valve body 40 is accommodated and a resin holder 9.
[0027]
The valve body 40 is installed on the back of the suction body 41 disposed inside the casing 70, a bowl-shaped rubber safety valve plate 42 disposed outside one end of the casing 70, and the other end surface of the safety valve plate 42. And a solenoid spring 44 interposed between the flange-shaped contact plate 43 and one end surface of the casing 70, and the casing 70. The suction body 41, the safety valve plate 42, It consists of a connecting rod 45 that connects the backing plate 43.
[0028]
In this embodiment, the can body 8 is made of a metal plate and is fitted into the through hole 11, and the one end side wall 82 having the cylinder portion 81 into which the valve body 40 is slidably fitted in the axial direction, and the suction body 41. It consists of a can tube part 83 to be included and a large diameter other end side tightening tube part 84.
[0029]
The holder 9 is provided with one end-side cylinder portion 91 that encloses and holds the electromagnetic solenoid 71 on one end side, and one end portion of a connector 72 for energizing the electromagnetic solenoid 71 is fitted and fixed to the other end side. The other end side cylinder part 92 is formed. The middle of the holder 9 is an intermediate wall 94 having a through-shaft hole 93.
[0030]
A caulking circumferential groove 95 is formed at one end on the outer periphery of the one end side cylindrical portion 91, and a flange 96 is provided around the other end. A flange 97 for fastening the safety valve 4 to the other end surface of the valve body 1 is fixed to the other end surface of the flange 96. One end side surface of the intermediate wall 94 is located on the other end side from the flange 97.
[0031]
The electromagnetic solenoid 71 has a horseshoe-shaped core 73, and an intermediate connecting portion 74 of the core 73 has a fastening hole 75, and the fastening hole 75 and the through shaft hole 93 are connected by a connecting pipe 98. Yes. An electromagnetic coil 76 is fitted on the arm portion 77 of the core 73. It is located inside the flange 97.
[0032]
The connector 72 includes an end portion 78a fitted to the other end side cylindrical portion 92, a cylindrical other end portion 78b, and an electrode 79 penetrating in the center, and the lead arranged at the center of the electrode 79 is an electromagnetic coil. 76 is connected.
[0033]
The lumen of the thermal power adjustment valve body 2 is a gas passage 25, and a throttle valve body 26 of the thermal power adjustment valve 21 is slidably fitted into the upper end portion of the gas passage 25. The valve hole of the valve body 26 is connected to a gas outflow passage 27 for supplying combustion gas to the stove burner B. The upper end portion of the valve body 26 is exposed at the upper portion of the heating power adjusting valve body 2, and a needle pin 28 for rotating the valve body 26 is attached to the exposed portion in the orthogonal direction.
[0034]
The needle pin 28 extends laterally from the upper end of the thermal power control valve body 2 and protrudes to the outside through an inclined slit 29 provided on the right side wall of the box-shaped bracket 23 and acting as a cam groove. The inclined slit 29 converts the amount of rotation of the needle pin 28 into the amount of movement of the valve body 26 in the axial direction, thereby increasing or decreasing the valve opening degree of the thermal power adjustment valve 21.
[0035]
A plate-like return lever 16 that is rotatably attached to the thermal power adjustment valve body 2 at a fulcrum 15 is attached to the right side wall of the thermal power adjustment valve body 2. At the lower end of the return lever 16, a band-plate-shaped force application arm 17 that is in contact with the lever operating portion 34 of the actuator and serves as a power application is extended so as to be bent at a right angle to the front side of the thermal power control valve body 2. Yes. A slit 18 that engages with the needle pin 28 is formed in the longitudinal direction (substantially upward) at the upper end of the return lever 16, and a semi-oval working arm 19 that engages with the operation lever 22 for adjusting the thermal power. Is provided in parallel with the slit 18 on the plate surface.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a combustion control device for a combustion device.
FIG. 2 is a perspective view of a combustion control device for a combustion device.
FIG. 3 is a perspective view of a table stove.
FIG. 4 is a cross-sectional view of an electromagnetic safety valve.
FIG. 5 is a plan view, a front sectional view, and a side sectional view of a safety valve case.
FIG. 6 is a cross-sectional view of a conventional combustion control device for combustion equipment.
FIG. 7 is a cross-sectional view of a conventional electromagnetic safety valve.
[Explanation of symbols]
1 Valve Body 2 Thermal Control Valve Body 3 Switch Mechanism 4 Electromagnetic Safety Valve 5 Main Valve 6 Safety Valve Case 7 Electromagnetic Actuator 8 Can 9 Holder 11 Through Hole (Safety Valve Hole)
13 Inlet 14 Outlet 26 Throttle valve body 40 Safety valve body (movable valve body)
41 Suction body 42 Valve plate 45 Connecting rod 63 Safety valve port (Valve port)
64 One end side wall 70 Casing 71 Electromagnetic solenoid 72 Connector 78a One end portion 78b Other end portion 81 Tube portion 82 One end side wall 83 Can tube portion 84 Other end side tightening tube portion 91 One end side tube portion 92 Other end side tube portion 97 Flange 100 points, fire extinguishing mechanism (operation means)

Claims (5)

A valve body having a through-hole constituting a part of a combustion gas flow path;
A valve opening of a safety valve provided in the through hole;
A casing having one end fitted into the end of the through hole, a movable valve body installed on one end side of the casing for opening and closing the valve port, and a suction body for the valve body, which is installed behind the casing and sucks the valve body In a safety valve for a combustion device including an electromagnetic solenoid for performing the operation and an electromagnetic actuator having a flange fixed to an outer periphery of the casing and fastened to an end surface of the valve body,
A safety valve for a combustion device, wherein the electromagnetic solenoid is arranged on the inner side or the other end side of the flange. 2. The casing according to claim 1, wherein the casing includes a side wall on one end side on which the valve body is attached so as to be freely displaceable in an axial direction, a can cylinder portion containing the suction body of the valve body, and a large diameter other end side clamping cylinder section. A can made of a metal plate to be fitted into the through hole,
A circumferential groove is formed on the outer periphery of the one end portion, and the flange is externally fitted on the outer periphery of the other end portion, and the one end side cylindrical portion containing the electromagnetic solenoid and a central through hole A coupling body in which a central wall portion having a pin and a resin holder composed of a cylindrical portion on the other end into which a connector is fitted are wound.
The said valve body consists of the valve plate located outside the one end side of the said can body, the said suction body located in a can, and the connecting rod which connects these, The safety valve of the combustion equipment characterized by the above-mentioned. 3. The can cylinder part according to claim 2, wherein a safety valve hole is formed in a side wall on one end side, and the other end of a cylindrical safety valve case provided with an inflow port for combustion gas is provided in the cylinder wall. A safety valve for combustion equipment. 4. The safety valve for a combustion device according to claim 1, wherein the electromagnetic solenoid holding part of the holder is potted. In any one of Claims 1-4, the outflow port which cross | intersects this through hole is formed in the one end side of the said through hole, The inflow port which cross | intersects this through hole is provided in the other end side of the said through hole, A safety valve for a combustion device, wherein a valve opening of a main valve is formed on a downstream side of a valve opening of the safety valve, and an operating means for the safety valve and the main valve is provided on one end side of the valve body.

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