JP2761787B2 - Motorized valve stopper structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an electronically controlled expansion valve used in a refrigeration cycle of a room air conditioner or a car air conditioner, or a proportional control used in combination with a microcomputer in general industrial fields. The present invention relates to a motor-operated valve used as a valve.

[Related Art] Conventionally, various types of stopper structures for electric valves controlled by a microcomputer by combining a stepping motor and a valve have been devised.

FIG. 6 shows Japanese Utility Model Application Laid-Open No. 62-93479 (hereinafter referred to as a stopper bolt system for convenience), and FIG.
This is a conventional electric valve stopper structure disclosed in Japanese Patent Application Laid-Open No. 62-107174 (hereinafter referred to as a rotor sleeve method for convenience), and the structure thereof will be described below.

6 and 7, a valve shaft (1) having a needle valve (3) and a male screw (4) formed from the tip is provided with a multi-pole magnetized outer periphery via a rotor sleeve (5a). Rotor for motor consisting of cylindrical permanent magnets (5)
The male screw (4) is fitted into the female screw (7) of the propulsion bearing (8) fixed to the valve body (6).

The outer periphery of the rotor (5) of the motor is covered with a thin cylindrical case (9). Outside the case (9), the stator coil (5) of the motor is located at a position corresponding to the rotor (5) of the motor. 10) has been fixed.

The lower end of the case (9) is air-tightly integrated with a valve body (6) having a fluid inlet / outlet (11) (12) and a valve seat (2) by plasma welding or the like. (13)
Sealed.

As a configuration of the stopper portion in the stopper bolt system shown in FIG. 6, a stopper bolt (14) having a high screw efficiency is fixed to the center of the inner surface of the lid (13). Screw a stopper nut (15) with a through hole (15a) (15a) near the peripheral edge, and fix a backing plate (16) to the tip of the stopper nut. The two pins (17) (17) fixed to the stopper nut are inserted into the through holes (15a) (15a) of the stopper nut.

Next, the operation of the stopper bolt type electric valve will be described.

When the stator coil (10) is energized to rotate a fixed amount in the valve closing direction, the motor rotor (5) and the valve shaft (1)
Rotate integrally, and the valve shaft (1) advances in the valve closing direction by the action of the propulsion screw.

On the other hand, a stopper bolt (14) fixed to the lid (13)
Since the stopper nut (15) fitted to the shaft is rotated by the pin (17) that rotates integrally with the rotor (5), the stopper nut (15) advances like the valve shaft (1).

Then, before the needle valve (3) is seated on the valve seat (2) and the valve is completely closed, the stopper nut (15) hits the abutment plate (16), and the linear movement of the stopper nut (15) is stopped.

Accordingly, the rotation / straight motion of the valve shaft (1) also stops.

Subsequently, when the stator coil (10) is energized in the valve opening direction, the rotor (5) rotates in the opposite direction, and the stopper nut (15) separates from the surface of the backing plate (16), and the valve Retreats backward with the shaft (1), and after a predetermined rotation, the lid (1
3), the linear motion of the valve shaft (1) also stops.

The configuration of the stopper portion in the rotor sleeve system shown in FIG. 7 will be described. The rotor sleeve (5a) integrated with the rotor (5) of the motor is radially protruded from the inner peripheral surface at one position. On the other hand, on the inner surface of the lid (13), the stopper pin (18) is fixed to the inner surface of the lid (13) by suspending the stopper pin (18) from the center to a position reaching the middle of the protrusion. In the range of less than one rotation of the rotor (5), the movement of the valve shaft (1) is restricted by bringing the stop pin (18) into contact with the side surface of the projection (5b).

Next, the operation of the rotor sleeve type electric valve will be described.

When the stator coil (10) is energized so as to rotate a fixed amount in the valve closing direction, the rotor sleeve (5a) fixed to the rotor (5) of the motor and the valve shaft (1) rotate integrally, The valve shaft (1) advances in the valve closing direction by the action of the propulsion screw.

Then, before the needle valve (3) is seated on the valve seat and is completely closed, a lid (13) is provided on the side surface of the convex portion (5b) of the rotor sleeve.
The rotation of the motor rotor (5) stops with less than one rotation by the stop pin (18) fixed to the valve shaft (1).
Rotation / straight motion stops.

Subsequently, when the stator coil (10) is energized in the valve opening direction, the valve shaft (1) retreats in the valve opening direction, and the side of the rotor sleeve opposite to the convex portion (5b) is eventually formed. Locking pin (1
In 8), the valve shaft (1) stops in less than one revolution.

FIG. 8 is a vertical cross-sectional view of a stopper in the electric control valve disclosed in Japanese Utility Model Laid-Open No. 60-182577. The configuration will be described below.

In this stopper mechanism, a mandrel (33) is fixed to a case (32) on the center axis of the rotor of the motor for driving the valve element, and the mandrel (33) has a spiral guide made of an elastic metal wire. A ring (34) is wound, and the lower end of the ring is fixed to the lower end of the mandrel (33) by caulking or the like.

The slider (35) is screwed into a spiral groove of the spiral guide ring (34).
5) is rotatable and movable in the axial direction of the mandrel (33). The outer end (35a) of this slider (35)
Is adapted to engage with a locking rod (37) erected on the rotor (31).

When the valve is opened, the outer end of the slider (35) is brought into contact with a stopper (34a) provided at the upper end of the spiral guide ring (34).
The ring-shaped end of 5) is the lower stopper (3
4b).

In other words, a mandrel (3
3) Spiral guide ring made of elastic metal wire (34)
The slider (35) having a protruding outer end (35a) is rotatably provided in a spiral groove of the spiral guide ring, so that the slider (36) is erected on the rotor (36). The outer end (35a) of the slider (35) is raised or lowered while being pressed by the rotation of the locking rod (37), and stoppers (34) provided at the upper and lower ends of the spiral guide ring (34) are provided.
The rotation of the rotor (36) is stopped by bringing the slider (35) into contact with (a) or (34b).

[Problem to be solved by the invention] The conventional stopper bolt type has a high resolution because it can take a large number of steps from fully closed to fully open.
Although there was a feature that flow control could be obtained with high accuracy, several types of parts for stopping the valve shaft, such as a stopper bolt (14) and a stopper nut (15), were required, which increased the cost of the electric valve and eventually resulted in stepping. There is a problem that a motor valve is expensive and cannot be used for a general-purpose air conditioner or the like.

In the case of the rotor sleeve type, the opening / closing operation of the valve shaft (1) is performed within a range of less than one rotation of the rotor (5). If it is too large, a hunting phenomenon occurs (for example, opening and closing operations are repeated between 20 and 21 pulses with respect to a desired flow rate), and there is a problem in durability.

Further, in the stopper using the combination of the spiral guide ring and the slider shown in FIG. 8, the vertical movement of the slider (35) is performed in the space of the case (32) above the rotor (31). For this reason, there is a problem that the dimension in the height direction of the case (32) becomes long.

According to the present invention, the resolution is reduced to a minimum necessary for preventing the occurrence of the hunting phenomenon, the number of components for stopping the straight movement of the valve shaft (1) is reduced, and the height of the case can be shortened. It is to provide a valve.

[Means for Solving the Problems] The stopper structure for a motor-operated valve according to the present invention includes a valve shaft which is energized by a stator coil (10) of a motor fixed to an outer peripheral portion of a case (9) made of a non-magnetic material. The rotor (5) of the motor integrally formed with (1) is rotated, and this rotation is converted into the linear motion of the valve shaft (1) by the propulsion bearing (8) to reduce the opening degree of the valve seat (2). In the motor-operated valve to be controlled, a convex portion (5b) is formed on the inner peripheral surface of the rotor sleeve (5a) integrated with the rotor (5) of the motor by protruding only one place in the radial direction. At the center of the inner surface of (13), the upper end of a core rod (19) having a flange (19a) at the lower end is fixed, and the lower end is provided facing the middle of the convex portion (5b). A stopper piece (20) is suspended and fixed at a position distant from the center, and the core bar (19) is provided with a vertical difference. The stopper member (21) having the upper protruding piece (21a) and the lower protruding piece (21b) protruding in the radial direction is rotatably loosely fitted, and the upper protruding piece (21a) has a rotational front surface or The stopper piece (20) is placed in contact with the rear surface, and the protrusion (5b) of the rotor sleeve is located in contact with the rear or front surface in the rotation direction of the lower protruding piece (21b). Is what you do.

[Operation] The stopper structure of the motor-operated valve according to the present invention is arranged such that, in the first rotation of the rotor of the motor, the protrusion (5b) of the rotor sleeve moves away from the projecting piece (21b) below the stopper (21). In the second rotation, the protrusion (5b) of the rotor sleeve hits the opposite side of the protruding piece (21b), and the stopper member (24) is rotated together with the rotor sleeve (5a). The rotation of the rotor (5) of the motor is stopped by the contact between the projecting piece (21a) and the stopper piece (20).

Therefore, compared to the conventional rotor sleeve type, the number of rotations of the motor during the period from the fully closed valve to the fully open valve can be increased (about 2 rotations in the illustrated example). Since the change in the flow rate per pulse can be reduced and the frequent opening / closing operation of the valve does not need to be repeated, the durability of the motor-operated valve is improved.

Further, since the stopper mechanism is configured by effectively utilizing the internal space of the rotor sleeve (5a), the dimension of the case (9) in the height direction can be reduced.

Embodiment of the Invention A first embodiment of the present invention will be described with reference to FIGS.

Note that the basic configuration is the same as that of the conventional product except for the component for stopping the rotation of the valve shaft (1), and thus the description is omitted.

The rotor (5) of the motor is integrated with the valve shaft (1) via a rotor sleeve (5a). The rotor (5) projects radially inward above the inner surface of the rotor sleeve (5a). Convex portion (5b) is provided.

At the center of the inner surface of the lid (13), a stopper piece (20) having a part of the outer edge of the disk protruding downward is hung down and fixed, and a flange (19a) is attached downward. The upper end of the provided core bar (19) is fixed, and the lower half thereof faces the middle of the projection (5b).

As shown in FIGS. 3 and 4, the stopper member (21) is provided such that an upper protruding piece (21a) and a lower protruding piece (21b) protrude in the radial direction with a vertical difference. When the stopper member (21) is loosely fitted to the core rod (19), the stopper piece (20) is arranged in contact with the rear surface in the rotation direction of the upper projecting piece (21a), and the lower projecting piece ( The protrusion (5b) of the rotor sleeve is arranged in contact with the front surface in the rotation direction of 21b).

 Next, the operation of the present invention will be described.

FIGS. 1, 3 and 4 show the closed state of the motor-operated valve. In this state, when the stator coil (10) is energized to rotate in the valve opening direction, it is completely independent of the stop member (21). To
The rotor (5) of the motor makes one rotation to the left when viewed from above, and the convex portion (5b) of the rotor sleeve abuts on the opposite side (rear surface) of the protruding piece (21b) below the stopper (21). Subsequently, when the rotor sleeve rotates, the protruding piece (21b) below the stopper member (21) is pushed by the protruding portion (5b) of the rotor sleeve and turns leftward (in this case, the upper protruding piece (21a ) Rotates in the direction away from the front surface of the stopper piece (20), so that the rotation of the rotor sleeve does not hinder at all). And the rotor (5) stops at about two rotations as shown in FIG.

FIG. 5 shows another embodiment, in which a stopper member to be loosely fitted to the core rod (19) is divided into an upper stopper member (22) and a lower stopper member (23). The upper protruding piece (22a) provided on the upper surface abuts against the front surface of the stopper piece (20), and the lower protruding piece (22b) is bent downward to provide an upper protruding piece provided on the lower stopper member (23). Projecting piece (23a)
It comes into contact with the rear surface. The lower protruding piece (23b) provided on the lower stopper member (23) comes into contact with the rear surface of the convex portion (5b) of the rotor sleeve.

By combining the two stop members in this way, the rotor (5) of the motor can be stopped in about three rotations.

That is, how many times the rotor (5) of the motor is stopped can be determined by the number of divisions of the stop member.

In the illustrated example, a winding spring is used as the stopper member, but this is not limited to a spring, and it is sufficient that projecting pieces are provided at appropriate positions above and below the cylinder. Therefore, if the direction of the projecting pieces is substantially the same, the rotation will be substantially one rotation, and if provided at a position of 180 °, the rotation will be substantially half a rotation.

[Effects of the Invention] The present invention divides a rotor (5) of a motor by dividing an appropriate number of stop members (21) to be loosely fitted to a core rod (19) fixed to a lid (13). It is possible to arbitrarily determine whether to stop at times. Further, the number of parts is reduced as compared with the conventional stopper bolt type, so that the cost can be reduced.

Also, compared to the conventional rotor sleeve type, the number of rotations of the motor during the period from the fully closed valve to the fully open valve can be increased. Hunting phenomenon does not occur because it is possible. Further, since the stopper mechanism is configured by effectively utilizing the internal space of the rotary sleeve (5a), the height of the case (9) can be reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a valve closed state in one embodiment of the present invention. FIG. 2 is a longitudinal sectional view showing the valve opening state of FIG. FIG. 3 is a partial perspective view showing the stop mechanism of FIG. FIG. 4 shows the first
AA sectional drawing of a figure. FIG. 5 is a partial perspective view showing another embodiment of the stop mechanism. FIG. 6 is a longitudinal sectional view of a conventional product. FIG. 7 is a longitudinal sectional view of another conventional product. FIG. 8 is a longitudinal sectional view of another conventional product. (1) Valve shaft, (2) Valve seat, (3) Needle valve (4) Male screw, (5) Motor rotor (5a) Rotor sleeve, (5b) Convex part (6) Valve body, (7) ) Female thread, (8) Propulsion bearing (9) Case, (10) Motor stator coil (11) (12) Doorway, (13) Lid (14) Stopper bolt (15) Stopper nut, (15a) Through hole (16) Patch plate, (17) Pin, (18) Stop pin (19) Core rod, (19a) Lower end (20) Stopper piece, (21) Stop member (21a) (21b) Projection piece

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-63-243581 (JP, A) JP-A-63-38779 (JP, A) JP-A-64-56582 (JP, A) JP-A-2- 58684 (JP, A) Fully open sho 60-182577 (JP, U) Fully open sho 59-183572 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) F16K 31/04 F25B 41 / 06

Claims (1)

(57) [Claims] An electric power is supplied to a stator coil (10) of a motor fixed to an outer peripheral portion of a case (9) made of a non-magnetic material.
The rotor (5) of the motor integrally formed with the valve shaft (1) is rotated, and this rotation is performed by the propulsion bearing (8).
In the motor-operated valve which controls the opening degree of the valve seat (2) by converting the linear motion into the linear motion, only one radial direction is provided on the inner peripheral surface of the rotor sleeve (5a) integrated with the rotor (5) of the motor. To form a convex part (5b), while fixing the upper end part of a core rod (19) having a flange part (19a) at the lower end to the center of the inner surface of the lid (13). With the lower end facing the middle of the projection (5b), a stopper piece (20) is hung down and fixed at a position distant from the center, and the core bar (19) is provided with a vertical difference. Upper projecting piece (21
a) and a stopper member (21) in which a lower protruding piece (21b) is protruded in a radial direction is rotatably loosely fitted. A stopper piece (20) is provided on the front or rear face in the rotational direction of the upper protruding piece (21a). The stopper structure of the motor-operated valve, wherein the protrusion (5b) of the rotor sleeve is positioned in contact with the rear surface or the front surface of the lower protruding piece (21b) in the rotation direction. .