JP5473695B2 - Motor safety valve - Google Patents

Description

  The present invention relates to a motor safety valve that opens and moves a movable electromagnet while a movable iron piece connected to a valve body is attracted to the movable electromagnet.

  As a conventional motor safety valve of this type, when closing a valve port provided in the middle of a gas passage, when the energization to the movable electromagnet is stopped and the electromagnetic force is extinguished, there is a gap between the movable electromagnet and the valve body. The urging force of the urging means provided to urge the valve body in the valve closing direction moves the valve body toward the valve port, and immediately closes the valve port to shut off the gas flow.

  In addition to simply opening the valve port, the flow rate of the gas flowing through the valve port is increased / decreased by increasing / decreasing the distance between the valve body and the valve port, for example, adjusting the thermal power of the gas burner provided downstream. What was made is known (for example, refer patent document 1).

Japanese Patent Laying-Open No. 2005-30440 (FIG. 1)

In the above conventional one, although the flow rate of the gas can be increased or decreased by increasing or decreasing the distance between the valve body and the valve port, it has been difficult to control the flow rate in a stable state. That is, the flow rate of each individual varies if the distance between the valve body and the valve port by variations among individuals is constant. Moreover, even if it is the same individual | organism | solid, the malfunction that the flow volume cannot be controlled stably arises by the error of the stop position accuracy of a valve body by hysteresis etc. arises. In particular, in the minimum flow rate state, the distance between the valve element and the valve port is shortened. Therefore, if this distance changes even a little, the gas flow rate changes greatly.

  In view of the above problems, an object of the present invention is to provide a motor safety valve capable of increasing and decreasing the flow rate stably and accurately.

In order to solve the above problems, a motor safety valve according to the present invention connects a movable iron piece to a valve body that opens and closes a valve port provided in the middle of a gas passage, and advances and retreats with respect to this movable iron piece by a driving force of a motor. A movable electromagnet is provided, and an urging means for urging the valve body in the valve closing direction is disposed between the movable electromagnet and the valve body, and the movable electromagnet is against the urging force of the urging means against the movable iron piece. In the motor safety valve that opens the valve body by retracting the movable electromagnet with the movable iron piece adsorbed close thereto, a cylinder-shaped storage part that communicates with the valve port, and a cylinder-shaped storage part that is inserted into the storage part and connected to the valve body A hollow heating power adjusting member that reciprocates in the storage portion along with the movement of the valve body is provided, and further, an annular groove and a gas passage communicating with the annular groove are formed on the peripheral surface of the storage portion, and the heating power adjusting member Multiple penetrations on the circumference of And the thermal power adjusting holes formed, by moving the combustion control member to change the thermal power adjusting holes that match the grooves of the annular, through the annular groove inside from thermal power adjusting hole through the combustion control member from the valve port Increase or decrease the flow rate of the gas flowing into the gas passage, and make sure that none of the heating power adjustment holes coincides with the annular groove when the valve body is closed. The thermal power control member closes the annular groove so that gas does not leak into the gas passage even if a valve closing failure occurs .

Rather than controlling the flow rate of the gas according to the distance between the valve body and the valve port, the communication state of the annular groove communicating with the opening of the gas power adjustment hole and the gas passage is changed by changing the communication state of the gas. The flow rate was controlled.

In addition, if dust or the like bites between the valve body and the valve port, there is a possibility that a valve closing failure may occur. Therefore, none of the thermal power adjusting hole in a state where the valve body is closed is not to match the groove of the annular, the thermal power adjusting member even if the valve closing failure between the valve body and the valve opening the gas into the gas passage is prevented from leaking by closing the annular groove.

  As is apparent from the above description, the present invention does not control the gas flow rate according to the distance between the valve body and the valve port, so that the gas flow rate can be controlled accurately and stably.

The figure which shows the structure of one embodiment of this invention The perspective view which shows the structure of a flow volume adjustment member

  Referring to FIG. 1, 1 is an example of a motor safety valve according to the present invention. A motor 2 having a gear mechanism inside is attached to the upper part of the motor safety valve 1. When the rotor in the motor 2 rotates, the movement direction is converted by the gear mechanism, and the output shaft 21 reciprocates in the vertical direction in the figure.

  On the other hand, a gas inlet 11 and an outlet 12 are provided in the lower part of the motor 2, and a valve port 13 is formed between them. A cylindrical storage portion 14 is formed from the valve port 13 to the outlet 12 side. The outflow port 12 communicates with a groove 15 formed in an annular shape on the peripheral wall of the storage portion 14.

  A movable electromagnet 3 is attached to the lower part of the output shaft 21. The movable electromagnet 3 includes an exciting coil 31, and is configured to excite a pair of magnetic poles facing downward when power is supplied from the outside and to demagnetize when power supply is stopped.

A rubber valve body 4 for opening and closing the valve port 13 is provided, and the valve body 4 is attached to the lower end of the valve shaft 5. Also,
A movable iron piece 51 is attached to the upper end of the valve shaft 5, and the magnetic pole of the movable electromagnet 3 is set to face the upper surface of the movable iron piece 51.

  The valve body 4 is always urged in the valve closing direction by a spring 41 which is urging means. In this state, the movable electromagnet 3 is lowered, the magnetic pole of the movable electromagnet 3 is brought into contact with the movable iron piece 51, and power is supplied to the excitation coil 31. Then, the movable iron piece 51 is attracted to the movable electromagnet 3. When the movable electromagnet 3 is lifted in the attracted state, the valve body 4 is lifted together with the movable electromagnet 3 and the valve port 13 is opened.

  A cylindrical heating power adjusting member 6 was connected to the lower part of the valve body 4 that opens and closes the valve port 13. The heating power adjustment member 6 is formed in a cylindrical shape and is inserted into the storage portion 14. Grease is applied between the outer peripheral surface of the thermal power adjustment member 6 and the inner peripheral surface of the storage portion 14, and the thermal power adjustment member 6 can reciprocate in the storage portion 14 while maintaining airtightness. Therefore, if the valve body 4 reciprocates, the heating power adjusting member 6 connected to the valve body 4 also reciprocates. In this embodiment, grease is applied, but it is not always necessary to apply grease.

  An intake port 60 is formed in the upper part of the thermal power adjustment member 6, and the gas that has passed through the valve port 13 flows into the thermal power adjustment member 6 through the intake port 60.

  Referring to FIG. 2 as well, a plurality of thermal power adjusting holes 61 are formed on the peripheral surface of the thermal power adjusting member. When any of these thermal power adjustment holes 61 coincides with the groove 15, the gas inside the thermal power adjustment member 6 flows out from the thermal power adjustment hole 61 into the groove 15 and then flows out from the outlet 12. And if the magnitude | size of the thermal power adjustment hole 61 is changed mutually, the flow volume of the gas which flows out from the outflow port 12 can be increased by enlarging the thermal power adjustment hole 61 corresponding to the groove | channel 15 one by one. Since each flow rate including the minimum flow rate is determined not by the distance between the valve body 4 and the valve port 13 but by the size of the flow rate adjusting hole 61, reliable and stable flow rate control can be performed.

  Further, in the state where the valve body 4 is seated and closed at the valve port 13, the gas flow between the heating power adjusting member 6 and the storage portion 14 is prevented so that none of the heating power adjusting holes 61 coincides with the groove 15. I was able to block. Thereby, for example, even if a valve closing failure such as dust biting occurs between the valve body 4 and the valve port 13, gas can be prevented from leaking from the outlet 12.

By the way, the flow rate may be defined by the thermal power adjustment hole 61 as described above, but in that case, it is necessary to replace the thermal power control member 6 for each gas type when the gas type is converted. Therefore, an orifice plate 7 is provided as an auxiliary part of the thermal power adjustment member 6, an orifice hole 71 corresponding to each gas type is formed, and inserted into the thermal power adjustment member 6 so that the orifice hole 71 coincides with the thermal power adjustment hole 61. You may comprise as follows. In this configuration as possible out to correspond by replacing the orifice plate 7 if it is changed gas species.

  A positioning groove 62 is formed in the heating power adjusting member 6 so that the phase of the orifice plate 7 is not shifted, and the positioning claw 72 of the orifice plate 7 is engaged with the positioning groove 62.

  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.

DESCRIPTION OF SYMBOLS 1 Motor safety valve 2 Motor 3 Movable electromagnet 4 Valve body 5 Valve shaft 6 Thermal power adjustment member 7 Orifice plate 13 Valve port 14 Storage part

Claims (1)

A movable iron piece is connected to a valve body that opens and closes a valve port provided in the middle of the gas passage, and a movable electromagnet that moves forward and backward by the driving force of the motor is provided to this movable iron piece, and the valve body is urged in the valve closing direction. An urging means is disposed between the movable electromagnet and the valve body, and the movable electromagnet is moved backward with the movable iron piece adsorbed against the movable iron piece against the urging force of the urging means. In the motor safety valve that opens the valve body by the above, a cylindrical storage part communicating with the valve port, and a hollow thermal power inserted in the storage part and connected to the valve body to reciprocate in the storage part as the valve body moves An adjustment member is provided, and an annular groove and a gas passage communicating with the annular groove are formed on the peripheral surface of the storage portion, and a plurality of through-hole thermal adjustment holes are formed on the peripheral surface of the thermal adjustment member. And moving the thermal adjustment member More the thermal power adjusting holes that match the grooves of the annular varied to increase or decrease the flow rate of the gas flowing through the inside of the combustion control member from thermal power adjusting hole from the valve port to the gas passage through the annular groove, further, the In the state that the valve body is closed, none of the heating power adjustment holes coincides with the annular groove, so that even if a valve closing failure occurs between the valve body and the valve port, the thermal power adjustment member remains in the annular groove. A motor safety valve characterized in that the valve is closed to prevent gas from leaking into the gas passage .

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