JP3400187B2 - solenoid 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 solenoid valve which is arranged in a gas supply passage of various gas appliances and controls the supply of gas.

[0002]

2. Description of the Related Art The solenoid valve has a structure in which a valve element biased in a valve opening direction is forcibly opened by a manual operation and held by suction, and is opened when an ignition switch is turned on. In addition to opening the gas passage, it is automatically closed due to extinguishing of the flame or overheating of the bottom of the pan by associating it with a thermocouple located near the burner or a temperature-sensitive element such as the thermistor located on the bottom of the pan in the case of a cooking device. It is used as a safety valve. However, in the use of the solenoid valve, the characteristics of the cooking device are affected by the room temperature resistance value of the temperature sensing element combined with the solenoid valve, and the cost increase occurs due to the adoption of the electronic circuit for controlling the operation of the solenoid valve. Therefore, in the Japanese Patent Application No. 6-326080, the applicant of the present application discloses a base body 51 and a casing 5 fitted to the base body 51 as shown in FIG.
2, a first electromagnet 55 including a fixed iron core 53 fixed to the base body 51, a first winding layer 54 wound around the fixed iron core 53, and a first electromagnet 55 thereof.
Direction and a movable iron core 57 integrally connected with a valve body 56 that is biased in the valve closing direction, and a second winding wound around the movable iron core 57 in a non-contact manner and integrally with the casing 52. Two electromagnets, a second electromagnet 59 composed of the wire layer 58, are provided side by side, and between the first electromagnet 55 and the second electromagnet 59,
An electromagnetic element that disposes a suction piece 60 that can move between the two and forcibly opens and holds the valve body 56 that is forcibly opened only when both the first electromagnet 55 and the second electromagnet 59 are excited. By providing a valve and connecting one electromagnet to the thermocouple and the other electromagnet to the temperature sensitive element to form a circuit, the safety device can be configured at low cost without affecting the characteristics of the cooker. .

[0003]

However, in the above solenoid valve, since the second winding layer 58 on the second electromagnet 59 side is embedded in the casing 52, its molding and
Since it is difficult to pull out the lead wire from the second winding layer 58 to the base body 51 side and the assembly is not easy, the manufacturing cost of the solenoid valve itself is increased.

[0004]

SUMMARY OF THE INVENTION Therefore, the present invention provides a solenoid valve in which two electromagnets are provided side by side in a rational configuration, which simplifies processing and manufacturing and reduces manufacturing costs. The configuration is such that, in the casing, a bobbin having a tubular portion into which the movable core is loosely inserted is housed, and the second winding layer is wound around the tubular portion, and further, in the bobbin , Contact to which the lead wire of the second winding layer is connected
While the plate is provided, the base is pierced and the contact is made.
It is characterized in that an electrode body connected to the point plate is provided. Further, the contact plate and the electrode body may be connected by pressing the contact plate and the electrode body when the base body and the casing are fitted together.

[0005]

The adoption of the action bobbin, the second winding layer easily wound into the cylindrical portion of the bobbin, the drawer of the lead wire bobbin
This can be easily done by connecting the contact plate provided on the terminal to the electrode body on the base side. If the contact plate and the electrode body are connected by the above pressure contact , the casing and the base body can be easily assembled and disassembled.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a longitudinal sectional view of a magnet solenoid valve 1 of the present invention, FIG. 2 is a sectional view taken along the line AA, and FIG. 3A is a longitudinal sectional view taken along the line BB, showing one end of a tubular casing 2. The collar part 3
A joint 3 as a base body including a is fitted, and a proximal end portion of a U-shaped fixed iron core 5 around which the first winding layer 4 is wound is fitted and fixed on the casing 2 side of the joint 3. First electromagnet 6
And the casing 2 is provided at the center of the joint 3.
A mounting hole 7 is formed on the axis of the. One end of the mounting hole 7 is swaged 12a through a washer 8 and a packing 9.
And the O-ring 10 between the mounting hole 7 and
A tubular contact fitting 12 having an insulating bush 11 interposed therein is inserted, and a tubular portion 13a formed at the proximal end of the terminal fitting 13 is fitted to a connecting portion 12b formed at the other end. Therefore, in the lead wire of the first winding layer 4, one end portion 4b is grounded to the joint 3 and the other end portion 4a is inserted through the contact metal fitting 12 at the outlet of the connection portion 12b and the terminal metal fitting. It is to be soldered together with the cylindrical portion 13a of 13. The joint 3 has a casing 2 on the side of the mounting hole 7.
Insertion hole 14 parallel to the axial direction of is formed, insert 15 is press-fitted and fixed therein, and inside this insert 15,
Electrodes 16 projecting in and out of the casing 2 are inserted and attached. Further, as shown in FIG. 2, the casing 2 of the joint 3
On the side, a ground 17 protruding into the inside of the casing 2 is attached at a point-symmetrical position of the insertion hole 14 around the mounting hole 7.

On the other hand, on the opposite side of the joint 3 in the casing 2, a valve shaft 18 is loosely inserted so as to be able to move forward and backward along the axis of the casing 2. The valve shaft 18 is integrally provided with a valve body 19 at an end on the outside of the casing 2, and is biased in a valve closing direction (rightward in FIG. 1) by a compression spring 20 provided between the valve body 19 and the casing 2. On the other hand, a base end of a U-shaped movable iron core 21 is fixed to an end of the valve shaft 18 on the inner side of the casing 2. The movable iron core 21 and the casing 2 are fixed to each other.
The protruding position of the valve element 19 is regulated by the contact with. Then, in the casing 2, as shown in FIG. 3, a disc portion 23 orthogonal to the axis of the casing 2 and a pair of short support pieces 24 extending from four sides of the disc portion 23 toward the joint 3 side. 24, a bobbin 22 including a pair of long connecting pieces 25a and 25b and a guide rod 26 that extends from the center of the casing 2 in alignment with the axial center of the casing 2 is assembled. The bobbin 22 has a step portion 2a formed in the middle of the casing 2 and a locking projection 2b provided on the inner surface thereof, and the support pieces 24, 2
4 are fitted and housed in the casing 2. In the housed state, the connecting piece 25a is between the electrode 16 and the casing 2, and the connecting piece 25b is the earth 17 and the casing 2.
It will be extended between and. Also, each connection piece 25a,
Square holes 27a and 27b are formed in the tip of 25b, and contact plates 28a and 28b are provided from the respective casing 2 sides by bending pieces 28c and 28c provided on both left and right sides.
Of the contact plates 28a, 28b are inserted into the square holes 27a, 27b to form bent portions 29a, 29b toward the center, and the electrodes 16 and the ground 17 are respectively held. Is pressed against. Further, the disk portion 23 of the bobbin 22 is provided with through holes 30 and 30 into which the movable iron core 21 is loosely inserted. One of the through holes 30 becomes a cylindrical portion 31 extending toward the valve body 19, Second winding layer 3 wound around the outer circumference
2 and the movable iron core 21 that is loosely inserted form a second electromagnet 33, and one end 3 of the lead wire of the second winding layer 32 is formed.
2a is connected to a contact plate 28a in contact with the electrode 16, and the other end 32b is connected to a contact plate 28b in contact with the ground 17. A ring-shaped movable piece 34 is loosely inserted in the guide rod 26. The movable piece 34 is slidably guided between the fixed iron core 5 and the movable iron core 21 by a guide rod 26 extending from the disk portion 23 of the bobbin 22 to the end of the fixed iron core 5. The movable iron core 21
Is the forward position where the valve body 19 projects most from the casing 2 and the retracted position where the movable piece 34 is pushed in until the movable piece 34 comes into contact with the fixed iron core 5 and is pushed in until it stops. It does not change.

Magnet solenoid valve 1 constructed as described above
In the state where neither the first winding layer 4 nor the second winding layer 32 is energized, the movable core 21 is in the position of FIG. 1 together with the valve shaft 18 and the valve body 19 due to the bias of the compression spring 20. 34 is also in a free state. Here, the valve element 19 is forcibly retracted by a manual operation or the like to a position where the movable core 21 and the movable piece 34 come into contact with the fixed core 5 and stop, and the first winding layer 4
When both the second winding layer 32 and the second winding layer 32 are energized, the excited first electromagnet 6 and second electromagnet 33 both attract the movable piece 34, so that the movable piece 34 has a fixed core, as shown in FIG. 5, the movable iron core 21 also maintains the position where it is attracted to the movable piece 34 against the bias of the compression spring 20. Therefore, the valve element 19 is also held in the retracted position (valve opening position). Next, when the energization of only the first winding layer 4 is stopped from this state, the excitation of the first electromagnet 6 is released and the movable piece 34 separates from the fixed iron core 5, but the excitation of the second electromagnet 33 continues. Therefore, the movable iron core 21 returns to the position of FIG. 3 (B) together with the valve shaft 18 and the valve body 19 by the bias of the compression spring 20 while the movable piece 34 is attracted. On the contrary, when the energization of only the second winding layer 32 is stopped, the movable piece 34 remains attracted to the fixed iron core 5 as shown in FIG.
Only 1, the valve shaft 18 and the valve body 19 are returned to their original positions by the compression spring 20.

Therefore, as shown in FIG. 4, the magnet solenoid valve 1 is incorporated in, for example, a blinker 40 of a table stove, and a terminal fitting 13 to which the lead wire of the first electromagnet 6 is connected.
The thermocouple 42 placed near the burner head 41.
To the electrode 16 to which the lead wire of the second electromagnet 33 is connected
Is provided in contact with the center of the bottom of a pot or the like placed on the pot of Gotoku, and the safety device can be connected to the PTC thermistor 43 and the dry battery (not shown) that increase the electrical resistance value rapidly at the set temperature as the temperature rises. Easy to configure. That is, after the valve body 19 is forcibly opened by the spindle 44 advanced by pressing the ignition switch 47, the first electromagnet 6 is driven by the thermoelectromotive force of the thermocouple 42 that detects the flame, and the electromotive force of the dry battery is used. Each of the second electromagnets 33 is excited,
The state of FIG. 3 (A) is maintained and the gas supply is continued. If the flame disappears in the burner head 41 from this state, the energization of the first winding layer 4 by the thermocouple 42 is stopped and the state shown in FIG.
When the pan bottom temperature rises and the PTC thermistor 43 reaches the set temperature by shutting off the gas passage 46 by closing the gas passage 5, the electric resistance value of the PTC thermistor 43 is suddenly increased to stop the energization of the second winding layer 32. In the state of (C), also in this case, the protruding valve body 19 closes the gas passage 46 to automatically extinguish the fire. As described above, in the above safety device, by adopting the magnet solenoid valve 1 of the present embodiment, the thermocouple and the PTC thermistor can be simplified without changing the design of the structure of the blinker or using a complicated control board. A highly reliable safety device can be configured at low cost with various connections. Of course, the characteristics of the table stove are not affected by the room temperature resistance of the PTC thermistor.

In the magnet solenoid valve 1, the connection between the lead wire of the second winding layer 32, the electrode 16 and the earth 17 is made with contact plates 28a and 28b provided on the bobbin 22 housed in the casing 2, respectively. 1 unit from the valve body 19 to the casing 2, the bobbin 22, the contact plates 28a and 28b, and the fixed iron core 5 to the joint 3 and the terminal fitting 13 with the movable piece 34 interposed therebetween. Since the structure is such that it can be roughly disassembled into three parts, it is of course easy to manufacture each of them, and the assembling thereof is performed at the same time as the assembling of the casing 2 side unit to the joint 3 side unit and the contact plate 28a. , 28b and electrode 16, earth 17
And are connected to each other, and done reasonably. Therefore, in addition to reducing the manufacturing cost of the magnet solenoid valve 1 itself,
Parts replacement and maintenance can be easily performed.

Since the bobbin 22 of the above-described embodiment can obtain an exciting force sufficient to hold the valve element 19 by suction and open the valve, the movable iron core 21 plays the cylindrical portion 31 around which the second winding layer 32 is wound. Although it is formed only in one of the through holes 30 to be inserted, the second winding layer 32 is wound by providing the tubular portion 31 also on the other through hole side of the movable iron core 21 depending on the required exciting force. be able to. Further, the tubular portion 31 does not necessarily have to be a complete tubular body, and if the second winding layer 32 can be wound around the movable iron core 21 in a non-contact manner, the tubular portion may be formed by intermittently arranging protrusions and walls. Can be formed.

[0012]

As described above, according to the present invention, a solenoid valve having two electromagnets can be rationally constructed, and the labor and cost associated with molding and assembly can be reduced. In particular, if the contact plate of the lead wire of the second winding layer and the electrode body are connected by pressure contact , they can be easily disassembled and assembled into the base body on the first electromagnet side and the casing on the second electromagnet side, and part replacement or Maintenance and the like can be easily performed.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a magnet solenoid valve.

FIG. 2 is a sectional view taken along line AA.

FIG. 3 (A) is a sectional view taken along line BB. (B) It is explanatory drawing which shows the operating state of a magnet solenoid valve. (C) It is explanatory drawing which shows the operating state of a magnet solenoid valve.

FIG. 4 is an explanatory diagram showing a state in which a magnet solenoid valve is applied to a table stove.

FIG. 5 is an explanatory view of a conventional magnet solenoid valve.

[Explanation of symbols]

1 ... Magnet solenoid valve, 2 ... Casing, 3 ... Joint, 4 ... First winding layer, 5 ... Fixed iron core, 6 ... First electromagnet, 13 ... Terminal fitting, 16 ... Electrode, 17 ... Earth, 18 ... Valve shaft, 19 ... Valve body, 20 ... Compression spring, 21 ... Movable iron core, 22 ... Bobbin, 25a, 2
5b ··· connecting piece, 28a, 28b · · contact plate, 31 · ·
Cylindrical part, 32..second winding layer, 33..second electromagnet, 3
4 ... Movable piece, 40 ... Blinker, 42 ... Thermocouple, 43
..PTC thermistors.

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-6-307631 (JP, A) JP-A-6-26653 (JP, A) JP-A 52-111024 (JP, A) JP-B 57- 61958 (JP, B1) JP-B-47-48972 (JP, B1) (58) Fields investigated (Int.Cl. ⁷ , DB name) F16K 31/06-31/11 F24N 5/24

Claims (2)

(57) [Claims] 1. A first electromagnet comprising a fixed core fixed to the base and a first winding layer wound around the fixed core in a casing fitted to the base, and on the casing side. There is a movable iron core integrally provided with a valve element that is integrally movable with a valve element that is provided so as to move back and forth in the direction of the first electromagnet, and is biased in the valve closing direction. Two electromagnets, a second electromagnet consisting of two winding layers, are provided side by side, and an attraction piece movable between the first electromagnet and the second electromagnet is arranged between the first electromagnet and the second electromagnet. An electromagnetic valve capable of adsorbing and holding the valve body forcibly opened only when both electromagnets are excited, wherein the casing comprises a tubular portion into which the movable iron core is loosely inserted. and with housing the bobbin, wound the second winding layer on the tubular portion, further The serial bobbin, while the lead wire of the second winding layer is provided contact plate, which is connected to said substrate, characterized by providing an electrode body that is connected to the contact plate through the base solenoid valve. 2. The solenoid valve according to claim 1, wherein the contact plate and the electrode body are connected by pressing the contact plate and the electrode body together when the base body and the casing are fitted together.