JPS608583A - stepping motor valve - Google Patents

Abstract

PURPOSE:To surely prevent the biting action of a valve unit, by vertically moving a turning pin for sensing opening and closing ends along a coil member so as to engage a radial piece of the turning pin with stoppers at closing of a valve, when a supporting metal fixute is turned. CONSTITUTION:A needle valve unit 3 turnably provides a turning pin 12 for sensing opening and closing ends, and its radial piece 12a both protrudes externally over the helical part of a coil spring 11 and engages with a driving pin 13 implanted to a supporting metal fixture 6' outside the spring 11. The needle valve unit 3 is vertically moved by turning a magnet 6, and the radial piece 12a of the turning pin engages with stoppers 11a, 11b in a fixed position, preventing the magnet 6 or the supporting metal fixture 6' from turning. In this way, action of the valve unit 3 is surely stopped in the fixed position.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention mechanically stops the operation of the valve body in the closed position between the feet and the closed position during the opening and closing operations of the valve body, thereby preventing the valve body from biting against the valve seat, etc. The present invention relates to a stepping motor pulp designed to prevent.

Figure 1 shows the @unreached state of the stepping motor valve v.
The valve body 1 is provided with a primary port 11L and a secondary port 1b, and a valve seat 2 is provided therebetween, and the needle valve body 3 facing the valve seat 2 is located in the motor chamber R of the cylinder 4 attached to the main body 1. A magnet 6 fixed to the needle valve body 3 is rotated and displaced by an electric signal to an electromagnetic coil 7 provided outside the cylinder body 4, so that the needle valve body 3 moves in the axial direction to approach and separate from the valve seat 2.

FIG. 2 shows an example in which such a stepping motor valve V is used as an expansion valve in a refrigeration cycle, where y is a compressor, C is a condenser, and E#'i is an evaporator. The super heat of Sensor S
The superheat is sensed by the superheat and converted into an electric signal by the controller P, which is supported by the expansion valve V. Based on the superheat, the expansion valve V opens and closes to control the flow rate of refrigerant to the evaporator X. .

However, in an expansion valve consisting of a stepping motor valve V having the above configuration, it is extremely difficult to control the electric signal to stop immediately when the valve is closed, and it is difficult to control the electric signal to immediately stop when the valve is closed. Since the configuration must be configured to send an extra electrical signal, the valve element tends to bite against the valve seat, which has the disadvantage that the valve element does not operate quickly based on the electrical signal when opening and closing. be.

The present invention focuses on the above-mentioned points, and is configured to mechanically stop the operation of the valve body at a certain position, thereby reliably preventing the biting motion of the valve body. .

The embodiments of the present invention will be described below.
In the motor valve V', a valve body 1 is provided with a primary port 1a and a secondary port 1b, and a valve seat 2 is provided therebetween, and a needle valve body 3 that approaches and separates from the valve seat 2 is connected to a partition wall 1o of the main body 1. It is movably supported by the hole 10 of. A cylindrical body 4 is attached above the partition wall 1°, and a square retaining portion 3 at the upper end of the needle valve body 3 is engaged with a square hole 8a of a stopper 8 provided in the cylindrical body 4. .

A threaded portion 3b is provided in the intermediate portion of the needle valve body 3, and a supporting metal A 6 / of a magnet 6 rotatably provided in the motor chamber R is screwed to this threaded portion 3b. By rotationally displacing the support metal fitting 6' by an electric signal to the electromagnetic coil T provided outside the cylinder body 4,
The needle valve body 3 moves up and down without rotating and moves toward and away from the valve seat 2. Support fund A6 / 14J11
On the other side, it is supported by a bearing 9 provided on the partition wall 10, and on the other side, it is supported under pressure in the axial direction by a coil spring 11 provided between it and the stopper 8 via a receiver 10. Stoppers 11a111b in the axial direction are provided at both ends of the coil spring 11, and one stopper 111L engages the hole abK of the stopper 8 to prevent rotation.

A rotating pin 12 for detecting the opening/closing end is rotatably provided on the needle valve body 3, and its radiating pieces 17a, 12a protrude outward beyond the helical portion of the coil spring 11. At this point, the drive pin 13 is engaged with the drive pin 13 installed in the support fitting 6'.

In the above configuration, the magnet 6 rotates in response to an electric signal sent to the electromagnetic coil 7, thereby generating a neat state.

The valve element 3 moves up and down to open and close the valve seat 2, and along with this, the rotating pin 12 for detecting the end of opening and closing rotates, causing the coil spring 11 to rotate.
, and at a certain position, the radiating piece 121L of the bottle 12 moves up and down along the direction of /11! It collides with L111b to prevent rotation of the magnet 6 to the support metal fitting 6', thereby reliably stopping the operation of the valve body 3 at a certain position.

Since the present invention is as described above, it is possible to reliably stop the valve body at a predetermined position at the end of the closing operation, thereby preventing the valve body from eating urine against the valve seat. ;can.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the conventional example, Fig. 2 is a usage state diagram of the same as above,
FIG. 3 is a sectional view of the present invention, and FIG. 4 is an enlarged view of the main parts. 1... Valve body, 2... Valve seat, 3... Valve body, 6
... Magnet, 6'... Supporting metal fitting, 11... Coil member, 12... Rotating bin for detecting opening/closing end, 11b...
Stotsunoku Patent Applicant Saginomiya Seisakusho Co., Ltd. Procedures Masaharu Neichi Shoji (Voluntary) July 310, 1980 Commissioner of the Japan Patent Office Manabu Shiga 1. Indication of Case Patent Application No. 107642 No. 107642 of 1983, Invention Name: Stepping Motor Valve 3, Relationship with the person making the amendment Patent applicant address: 55 φF'fZ'ti"tK" 2-7, Suzuki, Tokyo
No. 5 Name: Manufactured by Sagiaki Co., Ltd. ('I3n-j4, Agent 5, Date of amendment order: Showa year, Month, Day 6, 7 @ Number of inventions increased due to 7, Contents of amendment subject to amendment ( The claims of Japanese Patent Application No. 58-107642 are amended as follows: The valve body that comes into contact with and separates from the valve seat provided between the primary port and the secondary port of the valve body is rotated phantom to the valve body. A rotary pin for detecting the opening/closing end is provided concentrically with a coil member that is screwed onto a supporting metal fitting of a movably supported motor valve magnet, and is provided concentrically with the supporting metal fitting. Slide the helical part of the coil member □□□ and move it downward along the coil member while rotating the rotation pin together with the rotation of the air fitting, and close the puller 1. A sui-soping motor valve characterized in that the radiating piece is sometimes engaged with a stopper. Patent applicant Washinomiya Seisakusho Co., Ltd.

Claims (1)

[Claims] A valve body that comes into contact with and separates from a valve seat provided between the primary port and the secondary opening of the valve body is screwed into a support metal fitting for a motor pulp magnet that is rotatably supported with respect to the valve body, and the support metal fitting A rotation pin for detecting the opening/closing end is provided concentrically with the coil member provided concentrically with the coil member, and its radiating piece slides on the spiral part of the coil member, so that when the support fitting is rotated, the anti-rotation pin A stepping motor pulp, characterized in that the radiating piece is moved up and down along the coil member while rotating together, and the radiating piece is engaged with a stopper when the valve is closed.