JPH01299382A - Device for controlling flow-rate - Google Patents

Abstract

PURPOSE:To obtain a flow-rate control device which is simple in structure and is excellent in operating characteristics by mounting a valve onto the end section of the rotor shaft of a stepping motor, providing a stationary body for the other end thereof which is penetrated through, and thereby letting the stationary body be threadedly engaged with the shaft. CONSTITUTION:The upper section of a shaft 18 is threadedly engaged with a stationary body 24 fixed onto a can 14, a valve 20 is supported by a supporting member 28, and the supporting member 28 is fixed in a place that contrast with the stationary body 24 against the can 14. And when pulse signals are inputted into a stator 13, a permanent magnet 15 is rotated by a specified angle so that the shaft 18 is moved to the axial direction by means of threaded engagement between the stationary body 24 and the shaft 18. The valve 20 is therefore intended to be actuated, the valve 20 can thereby be controlled at will by pulse signals to the stator 13. In this constitution, since the stationary body 24 is threadedly engaged with the shaft 18, the inner section of a rotor 16 can be made simple in structure, thereby facilitating manufacture thereof while control characteristics can concurrently be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a flow rate control device that includes a valve seat and a valve in a flow path and controls the flow rate of the flow path.

[Prior Art] A flow rate control device that includes a valve seat and a valve in a flow path and controls the flow rate in the flow path has a simple structure and can be operated electrically by operating the valve with a solenoid. Since the valve has a simple opening/closing operation, if the flow rate needs to be adjusted, the valve must be configured to operate in multiple stages.

In addition, such flow control devices are versatile, such as being used in the refrigerant flow paths of air conditioning equipment, and are desired to be electrically controllable, simple in configuration, and reliable in operation without failure. .

The conventional flow rate control notification of this type will be explained with reference to Fig. 2. Fig. 2 is a vertical cross-sectional view of a conventional flow rate control device, in which a valve seat 2 is provided in a flow path 1 through which refrigerant, etc. of an air conditioner flows. A valve 3 that opens and closes the valve seat 2 is provided, and the valve 3 is provided with an operating mechanism 5 driven by a stepping motor 4.

The operating mechanism 5 is provided with a rotor 7 on the inner peripheral side of the stator 6 of the stepping motor 4.
The valve 3 is configured to move up and down as the valve rotates.

The vertical movement of the valve 3 is controlled by a screw mechanism 8a fixed to the flow path 1 side.
When the rotor 7 rotates, the rotor 7 moves up and down with respect to the screw mechanism 8a fixed on the flow path 1 side, and the rotor 7 and The valve 3 is configured to move up and down as a unit.

The rotor 7 is provided with a pin 9, and the pin 9 rotates along the spring 10a.
0b and rotates the spring 10b.

Further, when the spring tab rotates along the spring 10a, it is configured to stop rotating at the upper and lower ends of the spring 10a, and the rotor 7 is configured to be restricted from rotating after about 5 rotations.

Since the rotor 7 is a stepping motor 4, the stator 6
Since the rotor 7 moves by a fixed angle in the rotational direction with the number of input pulses, the rotation of the rotor 7 can be controlled by the number of input pulses of the stator 6, and as a result, the vertical movement of the valve 3 can be controlled.

Further, a spring 11 is interposed between the valve 3 and the rotor 7, and a stopper 12 restricts the valve 3 to rise only, so that when the pressure in the flow path 1 rises above a specified value, the valve The explosion-proof structure is such that the valve 3 automatically rises and opens the valve.

1. Problems to be Solved by the Invention" In such a conventional configuration, the stopper 12. The structure is complicated, and it is not easy to manufacture, and in order to improve durability, processing of parts and selection of materials are required, and the complicated structure does not allow quick operation characteristics.

The present invention was made in view of these circumstances, and
It is an object of the present invention to provide a flow control device that has a simple structure, can easily obtain reliable operation, and has excellent operating characteristics.

[Means for Solving the Problems] The present invention has a valve attached to one end of a shaft of a rotor of a stepping motor, and a fixed body through which the other end of the shaft is penetrated. The problem is solved by screwing the body and the shaft together.

[Operation] When the rotor rotates, the rotor moves in the axial direction because its shaft is screwed into the fixed body.

Therefore, the valve operates together with the shaft, and the operation of the valve can be controlled by pulse input from the stator that rotates the rotor.

Furthermore, the structure on the inner diameter side of the rotor is simple, which is extremely convenient for manufacturing.

[Embodiment] The present invention will be explained based on an embodiment shown in the drawings. Fig. 1 is a longitudinal sectional view of a flow rate control device according to an embodiment of the present invention.

In FIG. 1, the flow control device includes a can 14 mounted on the inner diameter side of a stator 13 constituting a stepping motor, and a rotor 16 equipped with a permanent magnet 15 inside the can 14. .

The rotor 16 is attached to a permanent magnet 15 on a shaft 18 via a support member 17 made of aluminum and having a U-shaped cross section.
The shaft 18 has a hole 19 formed at its lower end, into which a rod-shaped valve 20 is coaxially inserted.

Further, a spring 21 is interposed inside the hole 19, and the valve 2
It is configured to repel 0.

In the valve 20, a protrusion 22 formed by a pin from the support member 17 is fitted into a groove-shaped recess 23 formed long in the axial direction, and when the valve 20 is pushed upward, the valve 20 restricts the protrusion 22. It is configured to rise without being affected by

The upper part of the shaft 18 is screwed into a fixed body 24 fixed to the can 14, and this screwing is done through the screw 25 of the shaft 18.
A pin 27 is provided so that it is exposed on the inner peripheral surface of the hole 26.
This is done by

The valve 20 is supported by a valve support member 28;
The valve support member 28 is fixed symmetrically to the fixed body 24 at the lower part of the can 14 .

In such a configuration, in the flow control device, when a pulse signal is input to the stator 13, the permanent magnet 15 is rotated by a predetermined angle, and the shaft 18 is moved in the axial direction by the screw engagement between the fixed body 24 and the shaft 18. .

Therefore, the valve 20 will operate, and the stator 13
The valve 20 can be arbitrarily controlled by the pulse signal.

A flow rate control device having such a configuration has a simple structure, is easy to manufacture, and can improve control characteristics.

That is, since the fixed body 24 and the shaft 18 are screwed together,
The internal structure of the rotor 16 is simple and manufacturing is convenient.

Since the rotation of the rotor 16 is supported by the fixed body 24 and the valve support member 28, and also at both the upper and lower ends, the fixed #2
4 and the shaft 18 are not unevenly distributed or inclined, and stable rotation can be obtained.

The fixing body 24 and the shaft 18 can be screwed together by forming a hole 26 in the fixing body 24 and a pin 27 exposed to the inner diameter side of the hole 26. 27 can be screwed into the screw 25 of the shaft 18.

Therefore, the structure is simple and convenient for manufacturing.

Of course, the present invention is not limited to this embodiment, and the same operational effect can be obtained by forming screws in place of the holes 26 and pins 27 of the fixing body 24. It is also possible to form a molded product such as, and it is also possible to form an oil-impregnated metal.

Since the fixed body 24 has no restriction on the shape of the outer diameter side, it can be configured so that it can be attached to the can 14.
Bearings for the rotor 16 can be formed above and below the can 24 by having the same shape as the support member 28 of the valve.

Since the valve 20 is constantly pressed by the spring 21 to a pressure higher than the normal flow path pressure, the upper end of the recess 23 and the protrusion 22
are in contact with each other and are integral with the shaft 18 under normal flow path pressure.

Further, the shaft 18 supports the valve 20 via the spring 21, but when pressure from the flow path is applied to the valve 20, the valve 20 rises against the spring 21.

Therefore, an explosion-proof structure is constructed in which the flow path is unblocked when the pressure in the flow path increases abnormally.

In order to obtain such operation, a recess 23 formed in the valve 20
and the protrusion 22 are loosely fitted in the axial direction, and the recess 2
3 is formed to be long in the axial direction, the valve 20 is configured to be able to move in the axial direction independently of the shaft 18 against the spring 21 within the range of the loosely fitted state.

The movement of the valve 20 in the axial direction by the recess 23 is
This is the range in which the valve 20 rises against the spring 21.

The rotor 16 is provided with a support member 17 in order to integrate the permanent magnets 15 and the shaft 18. The support member 17 is formed into a U-shaped cross section to integrate the permanent magnets 15 and the shaft 18. The rotor 16 is formed of only the necessary parts, thereby improving the inertia characteristics with respect to the rotation of the rotor 16.

By forming the support member 17 from a light material such as aluminum, the characteristics can be further improved.

Furthermore, it is reasonable to connect the shaft 8 and the support member 17 with a pin forming the protrusion 22.

The rotor 16 has a fixed body 24 and a shaft 18 in a screwed relationship, and moves in the axial direction by rotation. Since the fixed body 24 and the valve support member 17 are each fixed to the can 14 and are strong, movement in the axial direction is restricted. It can be regulated.

Furthermore, a fixed body 24 and a valve support member 1 are provided above and below the can 14.
7 is attached, it is convenient for sealing the can 14, and by forming the can 14 into a cup shape as in this embodiment, the valve supporting member 17 is attached to the open side.
By attaching the can 14, the can 14 can be sealed.

Since the position of the valve 20 varies slightly in the axial direction in relation to the valve seat due to tolerances caused by mounting, etc., the position of the valve 20 may vary slightly in the axial direction in relation to the valve seat. can be adapted to the position of

In this case, even if the valve support member 28 and the valve 20 are not in close contact with each other, there is no fear of fluid leaking from the flow path as long as the inside of the can 14 is sealed from the outside.

[Effects of the Invention] According to the present invention, a flow rate control device having a simple structure and good operating characteristics can be constructed, and the advantages of being able to manufacture it at low cost as well as being easy to manufacture are extremely large.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a flow rate control device according to an embodiment of the present invention. FIG. 2 is a longitudinal sectional view of a conventional flow rate control device. 14...Can, 15...Permanent magnet, 16...
・Rotor, 17... Support member, 18... Shaft,
20... Valve, 22... Protrusion, 23... Recessed part,
25...screw, 26...hole, 27...bottle.

Claims (7)

[Claims] (1) In a flow control device that includes a valve seat in a flow path and controls a valve that advances or retreats from the valve seat from outside the flow path, the valve is attached to one end of the shaft of the rotor of a stepping motor, and the A flow rate control device comprising a fixed body through which the other end of the shaft is passed, and the fixed body and the shaft are screwed together. (2) The fixed body is provided with a hole through which the shaft passes, a pin exposed to the inner diameter surface of the hole, and the pin is screwed together with a screw formed on the shaft. Flow rate control device according to item 1. (3) A valve is inserted into the shaft in the axial direction, and a spring is provided so that the valve is repelled, and the shaft and the valve are provided with a recess and a protrusion that fit in the axial direction so as to be restrained in the rotational direction. 3. The flow rate control device according to claim 1, wherein the recess and the protrusion are loosely fitted in the axial direction. (4) Claims 1, 2 or 2, characterized in that the shaft is provided with a U-shaped support member that is opened in the outer radial direction and is provided with permanent magnets to form a rotor. 3. The flow rate control device according to item 3. (5) Claim 1, characterized in that the amount of movement of the shaft in the axial direction is regulated by the supporting member and the fixed body of the valve.
The flow rate control device according to item 1, 2, 3, or 4. (6) The fixed body and the valve support member are housed in a cylindrical can so that the shaft rotates inside, and a stator coil constituting a stepping motor is attached to the outside of this can. The flow rate control device according to the first, second, third, fourth, or fifth item. (7) The flow rate control device according to item 1, 2, 3, 4, 5, or 6, characterized in that the shaft and the valve are loosely fitted in the axial direction. .