JPH0245566Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a solenoid valve suitable for supplying gaseous or liquid fuel.

[Prior Art] Conventionally, solenoid valves for fuel supply, which have been used as gas safety devices, are closed by cutting off electricity, so in the event of a power outage, the fuel supply is interrupted and the fuel Even if there is a need for supply, it cannot be done.

In order to solve this problem and enable the supply of fuel even if the fuel supply control function by the solenoid valve is lost due to a power outage, it is possible to attach a manual operator to the solenoid valve that allows manual opening. .

However, if the solenoid valve equipped with this manual operator forgets to release the manual release when the power supply is resumed, the valve will not be closed by the manual operator, so even after the power supply is resumed, the solenoid valve will not be able to keep the valve closed. The disadvantage is that the supply control function is not restored.

[Problems to be solved by the invention] The present invention manually operates the manual operator attached to the solenoid valve by the valve closing operation of the valve member when the valve is closed after the power supply is resumed and the normal operating state is restored. The present invention aims to solve the problem of a solenoid valve being used in a state where the function of controlling the supply of fuel, etc. has not been recovered due to forgetting to release the manual operator by returning the operator.

[Means for Solving the Problems] The present invention has a valve body having an inflow passage, an outflow passage, and a valve seat formed between both passages, and a movable iron core provided with a valve member for opening and closing the valve seat. In a solenoid valve comprising an electromagnetic part, a valve spring is provided between the valve body and the valve member to bring the valve member into contact with the valve seat,
A manual operator having a locking groove is pushably provided at a position facing the movable iron core in the electromagnetic section, and when the valve member is opened to an intermediate open state by pushing the manual operator, the above-mentioned A locking member is provided which is biased by a locking spring that engages with the locking groove to maintain the intermediate open state of the valve member, and the locking force of the manual operator by the locking member is statically applied to the valve member. The spring force is set to be larger than the spring force of the spring, and the kinetic energy between the valve member and the movable core generated by the urging force of the valve spring when the valve member is fully open is made larger than the locking force of the locking member. Therefore, the above problem is solved.

[Function] When the valve member is biased by the valve spring to close the valve seat due to a power outage, pushing the manual operator against the valve spring will open the valve member in the middle and release fuel, etc. supply can be made. Even if the pressure of the manual operator is released after the valve member is brought into the intermediate open state, the locking member and the locking groove remain engaged, so that the valve member is maintained in the intermediate open state.

When the power supply is restarted, the valve member is fully open due to the electromagnetic force of the electromagnetic part, but after the valve member is fully open by the restart of power supply, when the power supply to the solenoid part is cut off, the valve member is fully open. The kinetic energy of the valve member and the movable iron core generated by the biasing force of the valve spring accumulated when the member is fully opened releases the locked state between the locking member and the locking groove and returns the manual operation button. The valve member is brought into a closed state.

[Embodiment] In the embodiment shown in FIG. 1, the valve body 1 connected to the fuel distribution pipe has an inflow passage 2 and an outflow passage 3.
A valve seat 4 is formed between the passages. Further, the valve body 1 includes the valve seat 4.
A projecting wall 5 whose upper end is open is formed on the top.

On the other hand, an electromagnetic device is composed of an exciting coil 8 wound around a bobbin, a fixed core 9 fixed at the center of the coil, a magnetic frame 10 and a magnetic plate 11 surrounding them, a movable core 12 attracted to the fixed core 9, etc. The portion 7 is placed in the opening of the protruding wall 5 and attached to the valve body 1 by appropriate means. Further, a guide tube 14 made of a non-magnetic material is fitted into the center hole of the bobbin, and the movable iron core 12 is slidably inserted into the guide tube 14.

Valve rod 16 screwed onto one end of the movable iron core 12
The valve member 17 passes through the center hole of the fixed core 9 and the valve seat 4, and is fixed to the other end of the valve member 17 for opening and closing the valve seat 4 on the inflow passage 2 side. A valve spring 18 interposed therebetween constantly biases the valve seat 4 in the direction of closing it.

A holding member 21 for holding a manual operator 20 disposed opposite to the movable core 12 is provided on a protrusion formed on the side of the magnetic frame 10 opposite to the valve body 1 . The manual operator 20 consists of a flange 22 and a shaft portion 23. A locking groove 24 with a reduced outer circumference is formed in the longitudinally intermediate portion of the shaft portion 23, and the shaft portion 23 is connected to the holding member 21. The manual operator 20 is attached to the holding member 21 so that it can be pushed into the holding member 21 by inserting the manual operator 20 into the center hole of the movable core 12 so that the tip of the manual operator 20 projects outwardly, and by arranging the flange 22 to face the end face of the movable iron core 12 . Further, the holding member 21 is provided with a plurality of holes 25 radially extending from the central hole into which the manual operator 20 is inserted, and ball-shaped locking members 26 are accommodated in these holes 25. It is pressed against the outer periphery of the shaft portion 23 of the manual operator 20 by a locking spring 27 in the hole 25 .

In FIG. 1, a is the stroke amount of the movable iron core 12,
b indicates the distance between the abutting position of the locking member 26 on the shaft portion 23 and the locking groove 24 when the manual operator 20 is not pushed in, and a>b.

Under normal conditions, the electromagnetic valve operates in the same manner as a known electromagnetic valve to open and close a fluid passage and control the supply of fuel. In this case, the stroke amount of the movable core 12 is a, and the manual operator 20 is operated by the locking members 26, . It is maintained in the state shown in Figure 1.

When the power supply to the excitation coil 8 is cut off due to a power outage, the valve member 17 closes the valve seat 4 by the urging force of the valve spring 18, and the flow of fuel stops. In order to manually open the valve member 17 in this state, the manual operator 20 is pushed in against the biasing force of the valve spring 18. When the manual operator 20 pushes the movable core 12 by a distance b, the valve member 17 enters an intermediate open state in which the valve seat 4 is opened by a distance b, and at the same time the manual operator 20
A locking member 26,
... are fitted, so that the valve member 17 is maintained in the intermediate open state by the locking force of the locking members 26, .... Therefore, by pushing the manual operator 20,
Fuel can be supplied even during a power outage, and even if the pressure on the manual operator 20 is released in this state, the manual operator 20 will not be pushed back by the valve spring 18. That is, statically, the locking force of the manual operator by the holding mechanism is set to be larger than the spring force of the valve spring 18.

When the power supply is restarted and the excitation coil 8 is excited in the above-mentioned state, the fixed iron core 9 attracts the movable iron core 12 at the intermediate position by a distance a-b.
The valve member 17 is fully opened against the leaf spring 18, but the manual operator 20 is connected to the locking groove 24 and the locking member 2.
They are held in the engaged state by the locking force with 6.

When the excitation coil 8 is de-energized in order to stop fuel supply in the fully open state of the valve member 17 described above, the valve member 17 and the movable iron core 12 are moved against the valve seat 4 by the biasing force of the valve spring 18 in the fully open state. slide in the direction of closing. The kinetic energy due to the sliding of the valve member 17 and the movable core 18 is transferred to the locking groove 2.
4. Since the locking force is greater than the locking force between the locking members 26, sliding in the valve closing direction releases the locking between the locking groove 24 and the locking member 26, and the valve is closed. The member 17 closes the valve seat 4 and at the same time closes the manual operator 20.
returns to the state shown in FIG.

In addition, as in the above embodiment, if a locking mechanism for a manual operator consisting of a locking groove and a locking member is provided in the magnetic frame of the electromagnetic part, the manual part for opening and closing the valve, such as the valve member or movable iron core, Unlike when a solenoid valve is installed, the locking mechanism does not operate under normal use of the solenoid valve, so even if a locking mechanism is attached to the manual operator, there is no need to increase the attraction force of the solenoid part. .

[Effects] The present invention is equipped with a manual operator, so when the flow of fuel, etc. stops due to a power outage, the valve member can be set to the intermediate open state by the manual operator, and the locking groove can be opened. Since the intermediate open state can be maintained by engagement with the locking member, fuel can be supplied.

Also, when the power supply is resumed, the valve member is held in a fully open state by the electromagnetic section, and when the power supply is cut off after the valve member is fully opened, the kinetic energy between the valve member and the movable iron core is transferred to the locking groove. Since the manual operator is returned to its original position by releasing its engagement with the member, not only will the fuel supply control function by the valve member not be impaired due to forgetting to release the manual operator, but it will also be easy to operate during the next power outage. There will be no hindrance.

Furthermore, since the manual operator and holding member of the present invention employ a mechanism that is commonly used as a detent mechanism, they are easy to manufacture and can be supplied at low cost.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view showing an embodiment of the present invention. 1... Valve body, 4... Valve seat, 7... Solenoid part, 1
2... Movable iron core, 17... Valve member, 18... Valve spring, 20... Manual operator, 24... Locking groove, 26
...Latching member, 27...Latching spring.

Claims (1)

[Claim for Utility Model Registration] An electromagnetic section comprising a valve body having an inflow passage, an outflow passage, and a valve seat formed between the two passages, and an electromagnetic part having a movable iron core provided with a valve member for opening and closing the valve body. In the valve, a valve spring is provided between the valve body and the valve member to bring the valve member into contact with the valve seat, and at a position facing the movable iron core in the electromagnetic part,
A manual operator for opening the valve having a locking groove is provided so as to be pushable, and when the valve member is opened to an intermediate open state by pushing the manual operator, the valve member is engaged with the locking groove. A locking member biased by a locking spring that maintains the intermediate open state of the valve member is provided, and the locking force of the manual operator by the locking member is statically set to be larger than the spring force of the valve spring. A solenoid valve characterized in that the kinetic energy between the valve member and the movable core generated by the urging force of the valve spring when the valve member is fully open is made larger than the locking force of the locking member.