JP3034436B2 - Combustion equipment safety valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety valve provided in a valve body of a combustion control device for a combustion apparatus using combustion gas or oil as fuel.

[0002]

2. Description of the Related Art Combustion equipment such as a table stove has a
An electromagnetic safety valve that opens by operation of the fire extinguishing mechanism and maintains the open state while combustion is detected by a misfire sensor (ignition sensor) is mounted. This safety valve is provided at the other end of a valve body having a through hole (valve hole),
The operation rod inserted into the through hole is moved in the axial direction by the pushing operation of the point / fire extinguishing mechanism provided on one end side of the valve body, and the operation rod presses the safety valve body to open the valve.

[0003] This safety valve keeps the valve open by the output of a misfire sensor (ignition sensor) for detecting the combustion of the burner or the normal combustion signal output by the misfire sensor. The attraction force of the electromagnetic actuator having the adsorbent and the electromagnetic solenoid mounted therein is lost, and the valve is closed by the spring load of the disposed solenoid spring. This safety valve is fitted into the other end of the through hole, has a valve port on one end face, and has a cylindrical resin safety valve case having an opening communicating with a gas inlet on a side face, an electromagnetic actuator, and an arrangement. The valve unit is formed by a solenoid unit that is urged by the solenoid spring and closes the valve port, and is attracted by an electromagnetic actuator to open the valve port.

[0004]

A conventional safety valve is formed by fitting a safety valve case into a through hole of a valve body and fitting the entire length of an electromagnetic solenoid into the safety valve case. For this reason, the length of the safety valve case is large, and the magnet unit may be fitted in a state where the fitting of the safety valve case is incomplete during automatic assembly, which causes a failure in assembly.

[0005] In addition, when a safety valve is used as a power source for maintaining a battery in an open state and an electromagnetic actuator using a weak current coil is used to extend the life of the battery, the size of the electromagnetic solenoid increases. I do. This is because in a magnet unit using a dry battery as a power source, it is necessary to reduce battery consumption as much as possible, and a measure is taken to increase the number of turns of the coil to reduce the current for performing the suction operation. Since a coil having a large number of turns is built in, the solenoid becomes larger than a magnet unit that uses the electromotive force of a thermocouple as a power source. For this reason, the safety valve case and the valve body also become large, which hinders downsizing of the device.

SUMMARY OF THE INVENTION An object of the present invention is to provide a safety valve for a combustion device which can reduce the overall length of the safety valve case and can securely fit the safety valve case, thereby being excellent in assemblability and facilitating automation of the assembling process.

[0007]

SUMMARY OF THE INVENTION The present invention has a through hole which forms a part of a combustion gas flow path, an outlet formed at one end of the through hole, and the other end of the through hole. A valve body of a combustion device provided with an inflow port intersecting with the through hole in a side wall of the combustor; operating means provided at one end of the through hole; and an operating means inserted into the through hole and attached by the operating means. An actuating rod that is urged and displaced, and a safety valve that is provided at the other end of the through hole and that is opened by the actuating rod. A cylindrical safety valve case having an opening at a portion corresponding to the inflow port and having a valve port at one end, and an adsorbent protruding after being fitted into the through hole after the safety valve case. Formed one end side is small diameter An electromagnetic actuator having a casing provided with a step in which the rear end of the safety valve case is locked in the middle, and attached to the tip of the adsorbent, and pressed against the valve port by a solenoid spring to close the valve port. And a magnet unit having a valve element that closes and is attracted by the electromagnetic actuator to open the valve port.

According to a second aspect of the present invention, in the safety valve, the safety valve case is an integrally molded product of resin, and a shaft support for slidably supporting the other end of the operating rod is formed at one end of the valve body. It is characterized by. The safety valve according to claim 3, wherein the other end side of the casing of the electromagnetic actuator includes:
The electromagnetic actuator is formed in a larger diameter portion than the one end side, and the large diameter portion houses an electromagnetic solenoid of the electromagnetic actuator. The safety valve according to a fourth aspect is characterized in that a portion between the large diameter portion of the casing and the through hole is sealed with a seal ring.

[0009]

According to the present invention, the safety valve case is fitted into the through hole, and then the magnet unit is fitted, whereby the incomplete fitting of the safety valve case is corrected when the magnet unit is fitted. For this reason,
The occurrence of assembly failure can be prevented, which is suitable for automatic assembly. According to the configuration of the second aspect, the tip of the operating rod can be accurately aligned with the axial center, and it is easy to set it concentrically with the valve axis of the safety valve.

According to the third aspect of the invention, since the weak current coil is accommodated in the large diameter portion of the casing, a large weak current coil can be adopted without increasing the diameter of the valve body. An electromagnetic solenoid for maintaining the safety valve in an open state by the electromotive force of a conventional misfire sensor can also be used. According to the configuration of the fourth aspect, even if the locking claw of the safety valve case is damaged or displaced, the sealing property of the safety valve itself is impaired due to the sealing property between the through hole of the valve body and the magnet unit due to the safety valve case. Can be maintained by the O-ring A, and the safety is high.

[0011]

1 to 3 show a combustion control unit of a stove / burner B (shown in FIG. 3) including a point / fire extinguishing mechanism (operation means) 100, a thermal power increasing / decreasing mechanism 200, and a thermal power adjusting mechanism 300 at the time of ignition. Indicates U. The combustion control unit U is mounted inside a table stove T shown in FIG. On the front surface of the table stove T, a point / fire extinguishing button 10 for operating the point / fire extinguishing mechanism 100 is urged forward by a spring (not shown) to be swingable in the front-rear direction.

Above the dot / fire button 10, a sliding operation knob 20 for operating the heating power increase / decrease mechanism 200 is provided.
Are slidably provided in the left-right direction. 3 and 7, the sliding position of the sliding operation knob 20 is low heating power at the right end, medium heating power at the middle, and strong heating power at the left end.

As shown in FIGS. 1 to 3, the point and fire extinguishing mechanism 100 includes a cylindrical valve body 1 horizontally mounted in the front-rear direction. Front part of valve body 1 (right part in figure)
On the upper surface of the thermal power adjusting valve body 2B of the thermal power increasing / decreasing mechanism 200
Are fastened vertically. The thermal power regulating valve body 2B has a tubular shape, and the thermal power regulating valve 2 is provided at an upper end portion of a lumen serving as a gas flow path. A valve hole (through hole) 11 is provided in the valve body 1, and a switch mechanism 3 operated by a dot / fire button 10 shown in FIGS. 3 and 7 is provided on the front end side (left end side in the figure) of the valve body 1. Has been concluded.

An operation lever 4 for operating the heating power adjustment valve 2 and adjusting the heating power of the stove burner B is attached to the upper end of the heating power adjustment valve body 2B so as to be rotatable in the left-right direction. In this embodiment, the operation lever 4 is rotatably supported by a fulcrum 42 on the upper wall surface of a box-shaped bracket 41 fastened to the upper end surface of the thermal power adjustment valve body 2B. The sliding operation knob 20 is fixed to the front end of the operation lever 4.

The switch mechanism 3 is fastened to the front end face of the valve body 1 by screws, forms a guide frame 31 having a substantially cross-shaped guide surface, and an actuator fitted in the guide frame 31 so as to be movable back and forth. 32. Actuator 32
Has a substantially cross shape in front, and has a rod-shaped base 33,
It has an airfoil-shaped lever action portion 34 projecting upward from the rod-shaped base 33 and a microswitch actuating portion 35 projected laterally from the rod-shaped base 33.

The actuator 32 is urged forward (to the left in the drawing) by a spring 37 interposed between the actuator 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 with the displacement of the micro switch operating section 35. When the actuator 32 is pushed from the projecting position (fire extinguishing position) shown in FIGS. 1 and 3, it reaches the pushed position (ignition position) shown in FIG. When the push is released in this state, a push / push mechanism P using a heart cam or a deformed heart cam (not shown)
As a result, it is locked at the intermediate position (combustion position), and when it is pushed in again from the intermediate position, it returns to the original projecting position (fire extinguishing position).

The valve hole (through hole) 11 of the valve body 1 has a coaxial center. In the valve hole 11, an operating rod 50 whose tip abuts on the tip (right end in the figure) of the rod-shaped base 33 of the actuator 32. But,
It is inserted movably back and forth. The front end 1A of the valve hole 11 is formed to have a small diameter, the front end of the operating rod 50 is slidably fitted in the axial direction, and a sealing member is interposed on the fitting surface. The intermediate portion 1B has a front portion with a middle diameter via the step wall 12,
The rear portion is formed to have a large diameter and serves as a gas passage. Valve hole 1
1, a main valve 5 is provided at an intermediate portion, and a safety valve 6 is provided at a right end portion.

The rear end 1C of the valve hole 11 is formed slightly larger in diameter than the rear of the intermediate portion 1B, and serves as a mounting portion for a safety valve 6 described later. An inflow opening 14 having a circular opening downward is provided at a front portion (left portion in the drawing) of the rear end portion 1C, and an outflow opening 15 opening upward and communicating with the thermal power regulating valve body 2B is provided at a front portion of the intermediate portion 1B. Are formed to form a part of the gas flow path.

The main valve 5 has a rubber main valve body 52 attached to a groove 51 formed in the middle of the operating rod 50, and a return valve disposed on the main valve body 52 via a metal back plate 53. It comprises a spring 54 and a main valve port 55 provided in the step wall 12. Return spring 54
The rear end is in contact with and supported by a front end surface of a safety valve case 60 described later. The operating rod 50 is urged forward by a return spring 54, and is displaced in the front-rear direction in conjunction with the actuator 32.

The safety valve 6 includes a resin-made cylindrical safety valve case 60 fitted in the rear end 1 C of the valve hole 11, and a magnet unit 7 having a tip portion fitted in the safety valve case 60.
Consists of The safety valve case 60 is made of polyacetal (P
OM), nylon (PA), or the like, and is integrally formed by injection molding. As shown in FIGS. 4A and 4B, the rear end is open and the opening corresponding to the inflow port 14 is opened. It has a thin cylindrical portion 62 having 61. On the front end side of the cylindrical portion 62, a thick valve port portion 64 having a center serving as a safety valve port 63 is formed with substantially the same outer diameter.

At the rear end of the cylindrical portion 62, a semicircular notch 65 is provided at a position rotated by 180 degrees from the opening 61. In the opening 61, a locking claw 66 having a catch 6A is formed at a position rotated by 180 degrees from the semicircular notch 65 so as to protrude into the opening 61 from the rear side toward the front side. The notch 65 is a mark for recognizing or detecting a position around the axis of the safety valve case 60 when the safety valve case 60 is inserted into the rear end 1C of the valve hole 11. As the mark, a notch, a protrusion, or any other mark that can be visually recognized or detected by a sensor can be used.

The locking claw 66 is provided so that the safety valve case 60
When it is inserted into the rear end portion 1C, it is caught on the hole wall of the inflow port 14 and acts as a stopper to effectively prevent the assembly. An O-ring groove 73 is formed on the outer periphery of the valve port 64, and an O-ring 67 is fitted therein. A cage-shaped shaft support portion 68 extends from the front end surface of the valve port portion 64, and a shaft support hole 69 for slidably supporting the distal end portion 5 </ b> A of the operating rod 50 is provided at the tip of the shaft support portion 68. It is formed coaxially.

The magnet unit 7 is shown in FIGS.
As shown in the figure, an electromagnetic actuator 8, a plug 70 fixed to the rear end face thereof, and a flange 7 to which the plug 70 is fixed.
1 is provided with a terminal 72 and a valve mechanism 74 provided on the front end side of the electromagnetic actuator 8. An O-ring groove 73 is provided around the outer periphery of the plug 70, and an O-ring A is fitted therein.

The electromagnetic actuator 8 has a stepped cylindrical casing 80 composed of a front small diameter portion 82 and a rear large diameter portion 83 via an intermediate step 81. An electromagnetic solenoid 86 in which a coil 85 with a bobbin is externally fitted to a horseshoe-shaped iron core 84 is accommodated in the large-diameter portion 83, and a suction shaft (adsorber: armature) 87 at the rear end of the small-diameter portion 82. 88 is inserted. The front end 89 of the suction shaft 88 projects from the casing 80 toward the front end.

The valve mechanism 74 includes a flange-shaped rubber safety valve body 76 fixed to the front end portion 89 of the suction shaft together with a flange-shaped backing plate 75, and a portion between the flange-shaped backing plate 75 and the front end surface of the casing 80. And a solenoid spring 77 interposed therebetween. The safety valve body 76 is pressed against the safety valve port 63 by a solenoid spring 77 to close the safety valve port 63, and the energization of the electromagnetic actuator 8 causes the suction shaft 8 to be closed.
7 is attracted to the electromagnetic solenoid 86 and the safety valve port 63 is
open.

The safety valve 6 is assembled as follows.
The safety valve case 60 is pushed into the rear end 1 </ b> C of the valve hole 11 of the valve body 1 with the semicircular notch 65 facing upward. The outer periphery of the front end of the safety valve case 60 has a rear end portion 1C and an intermediate portion 1.
B engages with the inner wall of the valve hole 11 and stops due to the difference in inner diameter from the rear part of B. By this pushing, the locking claw 66 is displaced inward and inserted into the rear end portion 1C, and when passing through the inflow port 14, the hook 6 </ b> A is hooked on the edge of the inflow port 14 and fixed.

Next, the magnet unit 7 is connected to the valve hole 1.
1, and the flange 71 is fastened to the rear end face of the valve body 1. At this time, the step 81 pushes the rear end of the safety valve case 60 into the depth of the valve hole 11, so that even if the safety valve case 60 is not completely fitted in the previous process, the safety valve case 60 is not required.
Can be reliably pushed into the appropriate position. For this reason,
Even in an automatic assembling process where it is difficult to confirm whether or not the safety valve case 60 has been normally assembled, it is possible to effectively prevent the occurrence of a defective assembly.

The O-ring A fitted in the O-ring groove 73 allows the electromagnetic actuator 8 and the valve body 1 to move.
Is sealed with the valve hole 11. The O-ring A keeps the valve hole 11 of the valve body 1 in contact with the magnet 11 even if the sealing property between the magnet unit 7 and the valve hole 11 is impaired due to the damage of the safety valve case 60 such as the locking claw 66 being damaged. It has an effect of securing a seal between the unit 7 and the casing 80.

The lumen of the thermal power regulating valve body 2B is the gas passage 2
The valve body 22 of the thermal power control valve 2 is slidably fitted into the upper end of the gas passage 21. Valve body 22
Is connected to a gas outflow passage 24 for supplying fuel gas to the stove burner B. The valve body 22 has an upper end exposed at an upper portion of the thermal power regulating valve body 2B, and a needle pin 23 for rotating the valve body 22 is attached to the exposed portion in a perpendicular direction.

The needle pin 23 is connected to the heat regulating valve body 2.
B, which is provided on the right side wall of the box-shaped bracket 41 and functions as a cam groove.
It projects outside through 0. The inclined slit 40 is
The amount of rotation of the needle pin 23 is converted into the amount of movement of the valve body 22 in the axial direction to increase or decrease the opening degree of the thermal power control valve 2.

A plate-shaped return lever 9 is attached to the right side wall of the thermal power regulating valve body 2B so as to be rotatable at the fulcrum 91 to the thermal power regulating valve body 2B. At the lower end of the return lever 9, a band-shaped force-point arm 92 serving as a point of force in contact with the lever operating portion 34 of the actuator is provided so as to be bent at a right angle to the front side of the thermal power regulating valve body 2 </ b> B. ing.
At the upper end of the return lever 9, a slit 93 that engages with the needle pin 23 is formed in the longitudinal direction (approximately upward).
Further, a semi-elliptical working arm 94 which engages with the operation lever 4 for adjusting the heating power is provided on the plate surface in parallel with the slit 93.

[Brief description of the drawings]

FIG. 1 is a sectional view of a combustion control device of a combustion device.

FIG. 2 is a sectional view of a combustion control device of the combustion equipment.

FIG. 3 is a perspective view of a combustion control device of the combustion equipment.

FIG. 4 is a front sectional view and a bottom view of the safety valve case.

FIG. 5 is a front view of the magnet unit.

FIG. 6 is a sectional view of a magnet unit.

FIG. 7 is a perspective view of a table stove;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Valve body 6 Safety valve 7 Magnet unit 8 Electromagnetic actuator 11 Valve hole (through-hole) 14 Inflow port 15 Outlet port 50 Working rod 60 Safety valve case 61 Opening 63 Safety valve port (valve port) 68 Shaft support part 76 Safety valve element (valve element) 77 Solenoid spring 80 Casing 81 step 86 Electromagnetic solenoid 87 Suction axis (adsorbent: armature) 100 points / fire extinguishing mechanism (operation means) A O-ring (seal ring)

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-63-226520 (JP, A) JP-A-51-24920 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F23N 1/00 102 F16K 31/06 380

Claims (4)

(57) [Claims] 1. A through-hole which forms a part of a combustion gas flow path, an outlet is formed at one end of the through-hole, and a side wall at the other end of the through-hole intersects with the through-hole. A valve body of a combustion device provided with an inflow port, operating means provided at one end of the through-hole, and an operating rod inserted into the through-hole and displaced by being urged by the operating means. A safety valve that is provided at the other end of the through hole and is opened by the operating rod, and is an integrally molded product of resin, which is fitted into the other end of the through hole; An opening is provided at a portion corresponding to the inflow port, a cylindrical safety valve case having a valve port at one end, and fitted into the through hole after the safety valve case, and one end side on which the adsorbent is protruded is formed to have a small diameter. And the safety valve case in the middle An electromagnetic actuator having a casing provided with a step at which a rear end is locked, and attached to the tip of the adsorber, pressed against the valve port by a solenoid spring to close the valve port, and adsorbed by the electromagnetic actuator. And a magnet unit having a valve body that opens the valve port. 2. The safety valve for a combustion apparatus according to claim 1, wherein the safety valve case has a shaft supporting portion formed at one end of the valve body to slidably support the other end of the operating rod. 3. The combustion apparatus according to claim 1, wherein the other end of the casing is formed with a larger diameter than the one end, and the electromagnetic solenoid of the electromagnetic actuator is accommodated in the larger diameter. Safety valve. 4. The safety valve according to claim 1, wherein a portion between the large diameter portion of the casing and the through hole is sealed with a seal ring.