JP2657664B2 - Flow control device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention 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 control device that includes a valve seat and a valve in a flow path and controls the flow rate of the flow path can operate electrically with a simple structure by operating the valve with a solenoid. When the flow rate needs to be adjusted because of simple opening and closing operations, the operation of the valve must be configured in a plurality of stages.

In addition, such a flow control device is versatile, for example, employed in a refrigerant flow path of an air conditioner, and it is desired that the flow control device be electrically controllable and have a simple configuration and a reliable operation without failure. .

FIG. 2 shows a conventional flow control device of this type. FIG. 2 is a longitudinal sectional view of the conventional flow control device, and a valve seat 2 is provided in a flow path 1 through which a refrigerant of an air conditioner flows. A valve 3 for opening and closing the valve seat 2 is provided. The valve 3 is provided with an operation 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, and the valve 3 is moved up and down by the rotation of the rotor 7.

The vertical movement of the valve 3 is controlled by a screw mechanism 8a fixed to the flow path 1 side.
And a screw mechanism 8b provided on the rotor 7 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. The valve 3 is configured to move up and down integrally.

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

Further, when the spring 10b rotates along the spring 10a, the spring 10a does not rotate at the upper and lower ends of the spring 10a, and the rotation of the rotor 7 is restricted to about 5 rotations.

Since the rotor 7 is a stepping motor 4, the rotor 7 advances at a constant angle in the rotation direction by the number of input pulses of the stator 6. Therefore, the rotation of the rotor 7 is controlled by the number of input pulses of the stator 6. The vertical movement can be controlled.

Further, a spring 11 is interposed between the valve 3 and the rotor 7, and is restricted by a stopper 12 so as to allow only the valve 3 to rise. An explosion-proof structure is constructed such that the valve 3 automatically rises and opens.

“Problems to be Solved by the Invention” In such a conventional configuration, the structure is complicated and difficult to manufacture, such as the provision of the stopper 12, and processing of members and selection of materials are required to improve durability. However, quick operation characteristics cannot be obtained from a complicated structure.

The present invention has been made in view of such a situation, and can easily obtain a reliable operation with a simple structure.
It is another object of the present invention to provide a flow control device having excellent operation characteristics.

Means for Solving the Problems The present invention provides an oil-impregnated metal having a stator outside a cylindrical casing, a rotor inside, and an inner side of the rotor fixed to the casing. A shaft is provided on the inner diameter side of each oil-impregnated metal, a valve is formed at the lower end of the shaft, a screw is formed at the upper end, and a spring member acting on the screw is provided, and the spring member is fixed to the rotor. This solves the problem.

[Operation] When the rotor rotates, the spring member is screwed onto the shaft, so that the shaft is moved up and down. This movement is performed by applying a pulse input to the stator to rotate the rotor at a predetermined angle. Since the rotation is performed in the direction, any movement can be performed.

In addition, since the rotor is supported by the oil-impregnated metal, smooth rotation is possible, and the shaft is configured to slide on the inner diameter side of the oil-impregnated metal, so that the sliding characteristics of the shaft are also improved. .

Further, the valve moves up and down by the up and down movement of the shaft, so that the fluid in the flow path can be controlled.

In addition, the structure is simple, it is easy to manufacture, and it is possible to configure a highly reliable structure with no fear of failure.

Embodiment The present invention will be described based on an embodiment shown in the drawings. FIG. 1 is a longitudinal sectional view of a flow control device according to an embodiment of the present invention.

In FIG. 1, a flow control device comprises a stator 14 constituting a stepping motor outside a cup-shaped casing 13.
And a rotor 15 made of a permanent magnet is provided inside.

The rotor 15 is provided so that the lower end is restricted in movement in the axial direction by the oil-impregnated metal 16 fixed to the casing 13 and rotates.The shaft 17 is provided on the inner diameter side of the oil-impregnated metal 16. Have been.

The shaft 17 is provided with a pin 18 at the bottom, and a recess 20 of the valve body 19 is provided.
And the recesses 21 of the oil-impregnated metal 16 are fitted to each other, and each of the recesses 20 and 21 is formed to be long in the axial direction, and is configured to be movable in the axial direction of the pin 18.

Further, the fitting between the shaft 17 and the valve body 19 is configured such that the valve body 19 is fitted from the lower end of the shaft 17 against the spring 22 and is not detached by the pin 18.

A screw 23 is formed at the upper end of the shaft 17, and the other end of the spring member 24, one end of which is fixed to the rotor 15, is in contact with the screw 23.

The spring member 24 slides against the screw 23 and is in a threaded state, and is configured so that the shaft 17 can be moved in the axial direction by the pitch of the screw 23 when the rotor 15 rotates. ing.

In such a configuration, when a pulse is input to the stator 14, the rotor 15 rotates a predetermined angle by the input pulse, and the screw 23 to which the spring member 24 is screwed is connected.
The shaft 17 is moved in the axial direction by the pitch of the rotated angle.

Therefore, the pin 18 provided on the shaft 17 moves the valve element 19 up and down, and the flow rate of a flow path (not shown) is controlled.

In such an operation, the rotor 15 and the shaft 17 are slid on the oil-impregnated metal 16, respectively, and by employing an oil-impregnated member for the oil-impregnated metal 16, excellent sliding characteristics can be obtained.

The casing 13 is formed in a cup shape, and
Rotor that rotates around oil-impregnated metal 16 when 16 is fixed
15 and casing 13 can be configured with high accuracy,
A gap formed between the rotor 14 and the rotor 15 can be reliably ensured.

If this gap can be secured with high accuracy, the efficiency will be improved and the torque of the rotor 15 can be increased, so that the integration of the casing 13 and the oil-impregnated metal 16 will be very effective. It is preferable that the cross section be circular so that good roundness can be obtained.

Since the valve element 19 is attached to the shaft 17 via the spring 22, the shaft 17 is used when the pressure in the flow path rises abnormally.
Can rise independently of the explosion-proof structure.

[Effects of the Invention] According to the present invention, an accurate flow control device can be obtained with a simple configuration, and the effect of being reliable and inexpensive can be extremely large.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a flow control device according to one embodiment of the present invention. FIG. 2 is a longitudinal sectional view of a conventional flow control device. 13 ... casing, 14 ... stator, 15 ... rotor, 16 ...
... Oil impregnated metal, 18 ... Pin, 19 ... Valve, 22 ... Spring, 23 ... Screw, 24 ... Spring member.

Claims (1)

(57) [Claims] 1. A flow control device for providing a valve seat in a flow passage and for controlling a valve which advances and retreats from the valve seat from outside the flow passage, comprising a stator outside a cylindrical casing and a rotor inside the cylindrical casing. ,
The inner diameter side of the rotor is supported by an axially long oil-impregnated metal fixed to the casing, a shaft is provided on the inner diameter side of the oil-impregnated metal, a valve is formed at the lower end of the shaft, and a screw is formed at the upper end. A spring member acting on the rotor, and the spring member is fixed to the rotor.