JP3130831B2 - Fully open holding mechanism of spring return type electric valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fully open holding mechanism of a spring return type electric valve for controlling opening and closing of a fluid flow path of an air conditioner, and more particularly to an improved valve holding mechanism for holding the opening and closing valve at a fully open position when power is not supplied. The present invention relates to a fully opened holding mechanism of a spring return type electric valve.

[0002]

2. Description of the Related Art FIG. 3 is a front view of a main part of a conventional spring return type motor operated valve in a fully opened state when energized.
FIG. 4 is a front view of a main part of the motor-operated valve of FIG. In the drawing, reference numeral 1 denotes a main body case of a valve opening / closing control actuator, and 2 denotes an output shaft attached to the main body case 1. The output shaft 2 receives a one-way rotational force of an electric motor (not shown) by a gear. The power is transmitted via a transmission mechanism (not shown). Further, the output shaft 2
When the electric motor is not energized, the motor returns to the other direction by a return spring (not shown). The electric motor, the gear transmission mechanism and the return spring are mounted on the main body case 1.

Reference numeral 3 denotes an on-off valve linked to the output shaft 2,
The on-off valve 3 opens and closes the fluid flow path 4. Reference numeral 5 denotes a pointer which is attached to a protruding shaft portion of the output shaft 2 from above the main body case 1 so as to be able to move up and down and tilt. The pointer 5 is adapted to rotate synchronously with the output shaft 2.

A pointer 6 is fixed to the output shaft 2 and has a pointer 5.
A retaining ring 7 for restricting the upward movement of the needle 5 is a spring interposed between the main body case 1 and the pointer 5, and the spring 7 urges the pointer 5 in the pushing direction.

Reference numeral 8 denotes a locking projection protruding from the main body case 1 for locking the pointer 5 by the repulsive force of the return spring at the fully open position of the on-off valve 3 when the electric motor is not energized. It is. Here, during normal use of the motor-operated valve, the pointer 5 maintains a horizontal posture in which the pointer 5 abuts and engages with the retaining ring 6 by the pushing force of the spring 7. The hands 5 in the horizontal posture can be locked by the locking projections 8 even if they rotate synchronously with the output shaft 2.
Is held at a position above the locking projection 8 so as not to be caught by the locking projection 8.

Next, the operation will be described. When the electric motor is energized during normal use of the motor-operated valve in which the pointer 5 is held above the locking protrusion 8 and the electric motor is energized, the output shaft 2 is driven to rotate in one direction against the return spring. As a result, the on-off valve 3 opens and the fluid flow path 4 is fully opened. Then, when the power supply to the electric motor is cut off, the output shaft 2 rotates to the other side by the elastic force of the return spring, whereby the on-off valve 3 closes and the fluid flow path 4 is completely closed.

The above is the normal valve opening / closing operation. However, when the on / off valve 3 is fully opened when the electric motor is not energized due to a power failure or the like, the output shaft 2 is rotated by a manual operation against the return spring. As a result, the pointer 5 is rotationally displaced to a position where it can be locked to the locking projection 8 (the fully open position of the on-off valve 3),
At this position, when the pointer 5 is pushed down and inclined against the push-up spring 7 as shown in FIG. 4, the pointer 5 is locked by the locking projection 8 by the repulsive force of the return spring, and the on-off valve 3 is opened.
Is held in the fully open position.

[0008]

The fully open holding mechanism of the conventional spring return type electric valve is configured as described above.
Since the locking projection 8 protrudes from the main body case 1, the pointer 5 is separated from the locking projection 8 so that the pointer 5 does not catch on the locking projection 8 during normal use of the electric valve. It is necessary to release the output shaft 2 from the main body case 7 to the position where the release is required. Even so, there is a problem that rotation of the pointer 5 synchronized with the output shaft is hindered because the rotation is synchronized with the output shaft 2 at a position higher than the locking projection 8.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and has a structure in which a pointer which rotates synchronously with an output shaft can be held at a position close to the surface of a main body case, and the pointer is attached for mounting. A spring return type electric motor that does not require a particularly high output shaft, greatly reduces installation space restrictions compared to the past, and can always stably perform rotation of the pointer synchronized with the output shaft. An object of the present invention is to obtain a mechanism for holding a valve fully open.

[0010]

According to the present invention, there is provided a fully-open spring return type electric valve holding mechanism comprising: an electric motor;
An output shaft that is driven to rotate in one direction by the electric motor when energized, and a return spring that rotates the output shaft in the other direction when the electric motor is de-energized, are attached to the main body case, and the output shaft has An on-off valve for controlling the opening and closing of the flow path is interlocked, the on-off valve is opened by one-way rotational force of the output shaft by the electric motor when energized, and the other-directional rotational force by the return spring when the electric motor is de-energized. In the fully open holding mechanism of the spring return type electric valve, the tiltable pointer is attached to the projecting shaft portion of the output shaft from the surface of the main body case in a direction perpendicular to the gently penetrable state, An elastic member for urging in a direction to push up from the surface of the main body case, and a locking groove formed on a part of the main body case to lock the pointer removably, When the dynamic motor is de-energized, the pointer is tilted against the elastic member at the fully open position of the on-off valve and fitted into the locking groove, so that the pointer is locked in the locking groove by the repulsive force of the return spring. It was done.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below. FIG. 1 is a cross-sectional view of a main part of a fully opened holding mechanism of a spring return type electric valve according to an embodiment of the present invention, showing a use state when energized. FIG. 2 is a main part showing a non-energized use state of the electric valve of FIG. FIG. 5 is a cross-sectional view, in which the same or corresponding parts as in FIGS. 3 and 4 are denoted by the same reference numerals, and redundant description is omitted. In the figure, reference numeral 2a denotes a pointer mounting hole which is opened in a direction perpendicular to the projecting shaft portion from above the main body case 1 of the output shaft 2, and the pointer 5 is loosely penetrated through the pointer mounting hole 2a in a tiltable manner. The pointer 5 is a spring (elastic member) for pushing up.
At 7, it is pushed up and abutted against the upper inner wall of the pointer mounting hole 2 a and is held in a horizontal posture at a position close to the surface of the main body case 1.

Reference numeral 9 denotes a retaining ring for retaining the hand attached to the distal end of the pointer 5, and reference numeral 10 denotes a locking groove provided on a part of the surface of the main body case 1. In the fully open position, the pointer 5 is releasably locked.

Reference numeral 10a denotes a groove bottom wall of the locking groove 10, and the groove bottom wall 10a is formed in an arc shape which is gradually lowered toward the side surface of the main body case 1. Thus, the groove bottom wall 10
The locking groove 10 having the slanted a can guide water drops generated on the surface of the main body case 1 to the outside of the side of the main body case 1 due to the heating of the fluid in the fluid flow path 4 or the like and flow down. For this reason, there is no possibility that the water droplets enter the inside of the actuator and hinder the electric motor or the like.

Although not shown in FIG.
An electric motor, a gear transmission mechanism for transmitting the one-way rotational force of the electric motor to the output shaft 2, and a return spring for returning the output shaft 2 to the other direction are built in.

Next, the operation will be described. During normal use of the electric valve, the pointer 5 is kept in the state shown in FIG. 1 in which it is detached from the locking groove 10, and in this state, when the electric motor is energized, the output shaft 2 is driven to rotate in one direction against the return spring. As a result, the on-off valve 3 opens and the fluid flow path 4 is fully opened. Then, when the power supply to the electric motor is cut off, the output shaft 2 rotates to the other side by the elastic force of the return spring, whereby the on-off valve 3 closes and the fluid flow path 4 is completely closed.

Next, when the on-off valve 3 is fully opened when the electric motor is de-energized due to a power failure or the like, the output shaft 2 is rotated by a manual operation against the return spring.
When the pointer 5 is pivotally displaced to just above the locking groove 10 and the pointer 5 is fitted in the locking groove 10 at that position while being pushed down and inclined against the push-up spring 7 as shown in FIG. 5 is a resilient force of the return spring and is a locking groove 10
And the on-off valve 3 is held at the fully open position.

When the on-off valve 3 is fully closed from the fully open position of the on-off valve 3, the pointer 5 is slightly lifted or
Alternatively, when the electric motor is energized and the output shaft 2 is slightly rotated in the direction opposite to the direction in which the pointer 5 is locked to the inner surface of the locking groove 10, the pointer 5 is pushed up by the push-up spring 7 and locked. The lock of the pointer 5 with respect to the groove 10 is released, and after the lock is released, the output shaft 2 is rotated by the return spring, so that the on-off valve 3 is fully closed.

[0018]

As described above, according to the present invention, the pointer is attached to the projecting shaft portion of the output shaft for synchronously rotating the on-off valve from the surface of the main body case so as to be tiltable by being gently penetrated in the orthogonal direction. Is urged by an elastic member in the direction of pushing up from the surface of the main body case, and a part of the main body case is provided with a locking groove for removably locking the pointer, which is opened and closed when the electric motor is not energized. At the fully open position of the valve, the pointer is tilted against the elastic member and fitted into the locking groove, so that the pointer is locked in the locking groove by the repulsive force of the return spring. As described above, there is no need to project a locking projection for locking the pointer at the fully open position of the on-off valve on the surface of the main body case, and the pointer can be held at a position close to the surface of the main body case. , For this, to attach the pointer There is no need to increase the output shaft, deliberately there is an effect that the restrictions on the installation space can be greatly relaxed as compared with the conventional. In addition, as described above, by rotating the hands synchronously with the output shaft at a position close to the surface of the main body case, there is an effect that the hands can always be rotated in a stable state.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a main part of a fully open holding mechanism of a spring return type electric valve according to an embodiment of the present invention when the electric power is used;

FIG. 2 is a cross-sectional view of a main part showing a use state of the motor-operated valve of FIG.

FIG. 3 is a front view showing a main part of a conventional fully open holding mechanism of a spring-return type electric valve in an energized use state.

FIG. 4 is a front view of a main part of the electric valve of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body case 2 Output shaft 3 On-off valve 4 Fluid flow path 5 Pointer 7 Push-up spring (elastic member) 10 Locking groove

Claims (1)

(57) [Claims] 1. A main body case comprising: an electric motor; an output shaft that is driven to rotate in one direction by the electric motor when energized; and a return spring that causes the output shaft to return to the other direction when the electric motor is not energized. The output shaft is linked with an on-off valve for controlling the opening and closing of the flow passage, and the on-off valve is opened by one-way rotational force of the output shaft by the electric motor when energized, and the return when the electric motor is de-energized. In a fully open holding mechanism of a spring return type electric valve in which the output shaft is closed by another direction rotational force of a spring, the output shaft is attached to a protruding shaft portion of the output shaft from the surface of the main body case in a state of gently penetrating in an orthogonal direction. A tiltable pointer,
An elastic member for urging the hands in a direction to push up the hands from the surface of the main body case, and a locking groove formed on a part of the main body case for locking the hands so as to be able to be disengaged are provided. When energized, the pointer is tilted against the elastic member at the fully open position of the on-off valve and fitted into the locking groove so that the pointer is locked in the locking groove by the repulsive force of the return spring. Spring return type electric valve fully open holding mechanism.