JPH0799211B2 - Shut-off valve unit with nozzle - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shutoff valve unit, and more particularly to a shutoff valve unit with a nozzle capable of accurately positioning a relative distance between a nozzle and a valve element.

<< Background of the Invention >> For example, in an impeller type flow meter, the diameter of a nozzle to be supplied to the impeller must be changed depending on the measurement range. In this type of flow meter, two nozzles, a small diameter nozzle and a large diameter nozzle, are provided, and the solenoid type cutoff valve provided in each nozzle is switched according to the change in flow rate by the command signal of the one-chip microcomputer for integrating counting. The nozzle diameter is changed, and all of the driving power is received from a long-term stable battery such as a lithium battery built into the flowmeter.

Therefore, a control system of this kind and a solenoid type shutoff valve driven by the control system are required to have a very low power consumption type, and it is necessary to use a light operation type solenoid.

Therefore, particularly in the solenoid type shutoff valve which operates in this manner, it is necessary to accurately maintain the relative distance between the valve element and the nozzle.

In other words, when the solenoid is downsized for the purpose of power saving, the operating force of the solenoid is inevitably small.Therefore, extra force is not required as much as possible, and the minimum required operating force ensures reliable and long-term operation. The structure must be able to open and close the valve body.

Generally, the element that determines the opening / closing operation of a solenoid shutoff valve is determined by the spring force of the spring and the relative separation distance between the valve body and the nozzle. Is pressed against the nozzle, and in order to re-release the nozzle from this state, it is necessary to set the suction force of the solenoid to overcome the spring pressure and pull the plunger into the solenoid.

Since the force of the spring is substantially constant depending on the material and thickness of the spring, if the stroke amount of the plunger is set with high accuracy, a reliable opening / closing operation can be expected even with a small force.

As described above, by setting the stroke amount of the valve element with respect to the nozzle with high accuracy, it is possible to obtain operational reliability even with a positive-acting shutoff valve.

<< Problems to be Solved by the Invention >> However, in the related art, this kind of accuracy problem has mainly depended on the accuracy corresponding to the manufacturing accuracy on the valve housing side.

In other words, in the past, while the nozzle was fitted and fixed in the nozzle mounting hole of the valve housing, a solenoid mounting hole was opened on the outside of the valve housing facing the nozzle, and a solenoid valve was assembled with the valve body and spring. The valve unit was fixed and the tip of the valve body was opposed to the nozzle.

Therefore, in this structure, the operation varies greatly due to variations in the manufacturing accuracy of the valve housing, assembly errors in assembling each component, or integration errors of these components,
In addition to giving a large loss to the operation for a long period of time, in some extreme cases, the breaking operation may not be performed.

This invention was made based on the above background,
It is an object of the present invention to provide a shutoff valve unit with a nozzle that can eliminate variations in operation and malfunctions by enabling the relationship between the nozzle and the valve element to be set accurately.

<< Means for Solving the Problems >> In order to achieve the above object, a shutoff valve unit with a nozzle according to the present invention comprises a valve housing and a partition wall formed inside the valve housing for partitioning a fluid into an upstream side and a downstream side. And a flange fixed to the valve housing, a solenoid fixed to a back portion of the flange, and a plunger of the solenoid protruding from a surface side of the flange. A valve body connected to the valve body, a compression coil spring interposed between the valve body and the flange, and a peripheral portion of the valve body,
Nozzle fitting holes formed in the partition wall, each spacer rod having one end coupled to the flange, and a nozzle fixed to the other end of each spacer rod and facing the valve body. By fixing the outer periphery of the flange to the valve housing in an airtightly fitted state, the assembly of the shutoff valve unit to the valve housing is completed.

<Operation> With the above configuration, the stroke amount of the valve body with respect to the nozzle is set uniformly and accurately by the position of the nozzle according to the lengths of the plurality of spacer rods. Therefore, a constant stroke amount can be obtained with high accuracy.

<< Example >> An example of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is an exploded perspective view of a brightness shutoff valve unit according to the present invention,
2 (a) and 2 (b) are sectional views showing a state in which the shutoff valve unit is assembled to a valve housing.

In the figure, a shut-off valve unit 1 includes a flange 2, a solenoid 3 fixed to the back of the flange 2, a valve body 5 projecting to the surface side of the flange 2 and connected to a plunger 4 of the solenoid 3, A compression coil spring 6 interposed between the valve body 5 and the flange 2, three spacer rods 7 having one end connected to the flange 2 at the peripheral portion of the valve body, and the other end side of each spacer rod 7. And a nozzle 8 fixed to the valve body 5 and facing the valve body 5.

The flange 2 is fixed via a gasket 11 to a mounting hole 10 formed on the outside of the valve housing 9.

The solenoid 3 is a bidirectional solenoid, and its internal structure includes a yoke 12 coupled to the flange 2, a coil 14 on the inner circumference of the yoke 12 and wound around the outer circumference of a bobbin 13, and a bobbin 13. Of the bobbin 13, a permanent magnet 15 coaxially arranged on the upper side of the bobbin 13, an anvil 16 fixedly arranged under the center of the bobbin 13 to receive the plunger 4, and fitted in the center hole of the bobbin 13 and projecting upward It is composed of a metal guide cylinder portion 17.

Then, the magnetic field formed by the permanent magnet 15 is canceled or strengthened by the forward and reverse currents flowing through the coil 14 through the lead wire 14a drawn to the outside, and the projecting operation of the plunger 4 by the spring pressure of the spring 6 is performed. ,
Both the pulling action against the spring pressure can be performed.

In addition, the guide cylinder portion 17 includes the plunger 4 and the bobbin.
This is a guide jig for setting the gap between 13 to be extremely small, and the device for maximizing the magnetic field acting on the plunger 4 by this is devised.

A male screw portion 4a is cut on the top of the plunger 4, and the male screw portion 4a is screwed to a valve shaft 5a integrated with the lower portion of the valve body 5.

The reason why the plunger 4 and the valve shaft 5a are divided in this way is that the magnetic flux flows to the valve shaft 5a and the valve body 5 side by coupling the valve body 5 and the valve shaft 5a with the plunger 4 as a material made of a non-magnetic material. This is to prevent this and to minimize loss due to magnetic flux leakage.

The upper side of the spring 6 is in contact with the lower surface of the valve body 5, and the lower side of the spring 6 is received by a spacer 18 which constitutes a pressure receiving surface located at the center of the flange 2.

The nozzle 8 has a tubular portion 19 having a through hole 19a at the center.
An O-ring 20 fitted to the outer periphery of the tubular portion 19, a flange portion 21 formed integrally with the lower peripheral edge of the tubular portion 19 and receiving the upper ends of the spacer rods 7, and a flange portion 21.
And a wedge-shaped cross section which is in contact with a valve rubber 5b attached to the upper surface of the valve body 5 at the lower peripheral edge of the flow hole 19a. The nozzle portion 19b of the is integrally projected.

A nozzle fitting hole 24 is formed in the partition wall 23 formed inside the valve housing 9 to divide the fluid into an upstream side and a downstream side so as to face the mounting hole 10 of the flange 2.
By inserting the tubular portion 19 in the above, the fitting portion is hermetically sealed by the O-ring 20 interposed between the tubular portion 19 and the fitting hole 24, and the insertion position is regulated by the flange portion 21. I am trying.

Reference numeral 25 in the drawing indicates L on the yoke 12 of the solenoid 3.
A sensor for detecting the operation of the solenoid 3, which is fixed through a character-shaped mounting plate 26, detects a change in magnetic flux associated with the operating state of the solenoid, and sends a detection signal to a control system (not shown) through a lead wire 25a. It is designed to be sent out.

To mount the shutoff valve unit 1 configured as described above on the valve housing 9, the tubular portion 19 of the nozzle 8 is inserted and fitted into the fitting hole 24 opened in the partition wall 23.

When the insertion is completed, the space between the tubular portion 19 and the fitting hole 24 is O-.
The ring 20 is interposed, and the periphery thereof is airtightly fixed by the sealing effect.

In this state, the flange 2 is located on the outer periphery of the mounting hole 10 formed on the outside of the valve housing 9. Therefore, if the screws B are screwed and fixed at the four corners of the flange 2,
Assembly of the shutoff valve unit 1 to the valve housing 9 is completed.

When the shut-off valve unit 1 configured as described above is attached to the valve housing 9, as shown in FIGS. 2A and 2B, the stroke of the valve body 5 with respect to the nozzle 8 is the length of the spacer rod 7. The accuracy is determined by the accuracy of 1 and is always constant regardless of the manufacturing accuracy of the housing 9. Therefore, it is possible to reliably perform the change from the released state of the nozzle 8 shown in FIG. 9A to the closed state shown in FIG.

<Effect> As described in detail in the above embodiments, according to the present invention, the stroke amount of the valve element with respect to the nozzle is uniformly set by the position of the nozzle according to the length of the plurality of spacer rods. It is possible to accurately obtain a constant stroke amount regardless of the manufacturing precision of the valve housing.

Therefore, in the present invention, like the one that operates the solenoid for a long time with a built-in battery such as a flow meter,
In particular, it is suitable as a unit for a shutoff valve that keeps the solenoid power consumption small and operates reliably at low output.Even with a general solenoid-type shutoff valve, the work of assembling the valve housing can be saved, so various It can be applied to shutoff valves.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a shutoff valve unit with a nozzle according to the present invention, and FIGS. 2A and 2B are sectional views showing a state in which the shutoff valve unit is assembled to a valve housing. 1 ... Shut-off valve unit, 2 ... Flange 3 ... Solenoid, 4 ... Plunger 5 ... Valve body, 6 ... Spring 7 ... Spacer rod, 8 ... Nozzle 9 ... Valve housing, 10 ... Mounting Hole 19b …… Nozzle part, 20 …… O-ring 23 …… Partition 24 …… Nozzle fitting hole

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masayuki Komaki 1188 Oshidate, Inagi City, Tokyo (72) Inventor Hiroshi Morita 5-1, Hirano-cho, Higashi-ku, Osaka City, Osaka Prefecture (72) Inventor Takatoshi Murakami 5-1, Hirano-cho, Higashi-ku, Osaka, Osaka Prefecture Osaka Osaka Gas Co., Ltd. (72) Inventor Yasushi Sato 19-18 Sakurada-cho, Atsuta-ku, Nagoya-shi, Aichi Toho Gas Co., Ltd. (72) In-house Yasuo 19-18 Sakurada-cho, Atsuta-ku, Nagoya-shi, Aichi Toho Gas Co., Ltd. 56) Bibliography Sho 58-28176 (JP, U)

Claims (1)

[Claims] 1. A shut-off valve unit with a nozzle, which is assembled between a valve housing and a partition formed inside the valve housing for partitioning a fluid into an upstream side and a downstream side, the shutoff valve unit having a nozzle fixed to the valve housing. Flange, a solenoid fixed to the back of the flange, a valve element protruding to the surface side of the flange and connected to the plunger of the solenoid, and a compression coil interposed between the valve element and the flange. A spring and a peripheral portion of the valve body,
Nozzle fitting holes formed in the partition wall, each spacer rod having one end coupled to the flange, and a nozzle fixed to the other end of each spacer rod and facing the valve body. A shutoff valve unit with a nozzle characterized in that the outer periphery of the flange is fixed to the valve housing in a state of being airtightly fitted to the valve housing to complete the assembly of the shutoff valve unit to the valve housing.