JPH03168479A - Selector valve - Google Patents

Abstract

PURPOSE:To hold a pressing condition with out requiring any energy by turning an eccentric unit by a motor, pressing a valve unit to the first or second valve seat in a position of the dead point of the eccentric unit and cutting off electrification in the pressing condition. CONSTITUTION:A selector valve is formed of a valve A and an operating mechanism B. The valve A has the first, second, third ports 3, 4, 5 and the first and second valve seats, 6, 7, and a valve unit 11 is mounted to a valve shaft 10 through a valve unit arm 12 and position-selectably pressed to the valve seats 6, 7. In the operating mechanism B, a turn motion of a motor 15 is converted by a converting mechanism 16 into a reciprocating motion which is transmitted to the valve shaft 10. The converting mechanism is provided with an eccentric unit 21, arms 23, 24, etc. While in a stop switch mechanism 17, electrification in a pressing position is cut off by the first and second stop switches 31, 32 through action of a switch cam 29. Thus pressing of the valve unit is maintained in the dead point of the eccentric unit, during this time, no energy is consumed with no electrification.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a switching valve, and more particularly to a switching valve in which the switching operation of the valve is performed by a motor. [Prior Art] This type of switching valve has the following configuration.
That is, the first valve seat and the second valve seat, the first position where the valve seat is pressed against the first valve seat to block it, and the second position where the valve seat is pressed against the second valve seat and closes it. Equipped with a valve body that can be freely replaced. The valve body is normally positioned at the first position by the biasing force of a spring. On the other hand, when the motor is energized, its rotational force moves the valve body from the first position to the second position against the biasing force of the spring. There is a switching valve with this kind of configuration. [Problems to be Solved by the Invention] This conventional switching valve is convenient because the valve can be switched simply by turning on and off the power to the motor by operating a switch. However, the above motor has a problem in that it requires a motor with large torque. That is, when moving the valve body from the first position to the second position and pressing the valve body against the second valve seat, the motor has a reaction force against pressing the valve body against the second valve seat and the spring. A large force combined with the urging force of is applied as a load. Therefore, the motor mentioned above must have a large torque to overcome such a large load. Furthermore, in order to hold the valve body pressed against the second valve seat, the motor must continuously generate a force to balance the large load described above, and for this reason, a large current is passed through the motor. There is also the problem that it has to be left alone and consumes a lot of energy. The present invention has been made in order to solve the above-mentioned problems and technical problems of the prior art, and the movement of the valve body from the first position to the second position or vice versa is entirely performed by a motor. When pressing the valve disc against the valve seat, only the reaction force of the pressing is applied to the motor as a load, and when the pressing is completed, there is no force transmission between the motor and the valve disc. To provide a switching valve in which the volatilization part of an eccentric body interposed in the actuator serves as a dead center, and the above-mentioned pressed object can be held without requiring any external energy supply. The purpose is to [Means for Solving the Problems] In order to achieve the above object, the present invention takes the measures as described in the claims above, and its effects are as follows. [Action] When the motor is energized through the operation switch and rotates, the eccentric body rotates. The rotation of the eccentric body causes the valve body to separate from, for example, the first valve seat, and is pressed against the second valve seat by the pressing portion of the eccentric body. When the pressing is completed, the pressing part is at the dead center with respect to the center of rotation of the eccentric body. the result,
Even if a reaction force against the pressing of the valve valve against the second valve seat is applied to the pressing portion, the eccentric body does not rotate. Therefore, the pressed state is maintained without requiring energy to prevent rotation of the eccentric body. [Example] The drawings showing the example of the present application will be explained below. In the first factor, the switching valve is composed of a valve A and an operating mechanism B. First, valve A will be explained based on Figures 1, 2, and 5 of the drawings. This valve A shows a well-known three-way valve, and 1 is a valve body, which has a hollow part 2 inside, and is also provided with a first boat 3, a second boat 4, and a third boat 5. 6 indicates the first valve seat, and 7 indicates the second valve seat. 8 is a valve cover, which is attached to the valve body 1 in a watertight manner. 9 is a bearing attached to the valve lid, 10 is a valve shaft rotatably and watertightly attached to the bearing 9, and 11 is a valve body, which is attached to the valve body arm l2 attached to the valve stem 10, and In order to replaceably and tightly close the first valve seat 6 and the second valve seat 7, respectively, a first position is pressed against the first valve seat 6 to close it, and a first position is pressed against the second valve seat 7 to close it. The position can be freely changed to the second position where it is closed. The valve body 1l is made of a resilient rubber material, for example, so that it can tightly close the valve seats 6 and 7. Next, operating mechanism B will be explained. The side B of the operating device is a motor 15, and a converter f1116 that converts the rotational force of the motor into reciprocating motion and transmits it to the valve shaft IO of valve A.
A stop switch Ilfl that cuts off power to the motor I5 when the valve body H is located at the first position and the second position, respectively.
It has ll7. First, the motor l5 will be explained. The motor 15 is a small geared motor whose output shaft l8 rotates in one direction when energized.

l9 is the motor cover. Next, the conversion mechanism 16 will be explained based on FIGS. 1, 2, and 4. Reference numeral 20 shown in FIG. 1 is a frame book, and the valve lid 8 is
It is fixed to the converter side 16 along with its valve cover 8.
It constitutes the basic framework of This base frame also has a base frame for attaching the stop switch machine 17 and the motor 15. Reference numeral 21 denotes an eccentric body attached to the output shaft 18 of the motor 15, for example a cam is used (a crank can also be used), 22a, 22b . 22c l.
A pushing part, a pressing part, and a releasing part provided in this order on the circumferential surface of the eccentric body 2l are shown, respectively, and the pushing part 22a and the releasing part 22c are closer to the center of rotation of the eccentric body 2l, that is, the above-mentioned The output shaft 18 has a shape with a large radius from the center of rotation, and the pressing portion 22b is formed in an arc shape centered on the center of rotation. Next 23. 24 is the arm lever and the bottle 25. 25 to the valve M8 and the frame 20. 26 is an arm lever 23. A spring tensioned between the free ends of both arm levers 23. 24
It is designed to provide a biasing force that attracts the two to each other. 2
Reference numeral 7 denotes a connecting lever whose base is housed in the valve shaft 10, and is positioned between the two arm levers 2324tll. Next, regarding the stop switch fill 7, drawings 1 and 2
, 3 will be explained based on FIG. 28 indicates a game and has two elements 28a . 28b are joined together. Reference numeral 29 denotes a switch cam installed on the output shaft l8 of the motor l5, which has a switch opening part 30 in a part of its periphery. 31. Reference numeral 32 indicates a first stop switch and a second stop switch, which are operably connected to the switch cam 29, and both are constructed in a well-known manner by a pair of contact plates attached to the gate 28. Note that these switches 31. 32, the electric circuit shown in FIG. 6 will be explained below. 32 is connected to the motor l5 as shown. 33. 34
．． Reference numeral 35 indicates a connection terminal between the switching valve and an external electric circuit, such as a screw terminal or a harness. still,
In the external circuit, 36 is a power supply, for example, the well-known 100
This is a commercial power source for Volt. Reference numeral 37 denotes an operation switch, which is a changeover switch capable of switching between the first open 37a and the second full 37b as shown in the figure. Next, the operation of the switching valve with the above configuration will be explained based on Fig. 6. First, as shown in column (a), operate switch 3.
When 7 is in the first position (II), the electric circuit, stop switch mechanism, conversion mechanism, valve, etc. are in the state shown in the figure. That is, the valve body 1l is pressed against the valve seat 6. The first stop switch 3l comes into contact with the open part 30 of the switch cam 29 and is in the open state, so that the motor 15 is not energized and the motor is in the stopped state.In this case, the spring 26 The clockwise rotational force applied to the lever 23 is applied to the pressing portion 22.
At b, a force is applied to the eccentric body 21, and the force relationship is balanced by the reaction force of the eccentric body 21 against this force. Since the pressing portion 22b is an arcuate surface, the arm lever 23
The force applied from is directed toward the center of rotation of the eccentric body 21. That is, in response to the force applied from the arm lever 23, the pressing portion 22
b is the dead center relative to the center of rotation. Therefore, even if force from the arm lever 23 is applied to the eccentric body 21, the eccentric body 21
1 does not rotate. On the other hand, from the 5 spring 26 to the arm lever 24
The counterclockwise biasing force applied to the linking lever 27 acts as a force for rotating the linking lever 27 clockwise. The linking lever 27 uses this rotational force to press the valve body 11 against the first valve seat 6 via the valve shaft 10. The force relationship is balanced by the elastic reaction force against the pressing. The pressing force of the valve body 11 against the first valve seat 6 becomes the shutoff force of the valve. The breaking force can be changed by replacing the spring 26 with one having a different biasing force. As mentioned above, the valve body 11 is connected to the first valve seat 6
, the first boat 3 enters a shut-off state, and, for example, fluid flowing into the third boat 5 flows out into the second boat 4 through the hollow portion 2 in the valve body 1 .

Next, when the operation switch 37 is switched to the second side as shown in column (b), the motor is activated through the second side 37b of the operation switch 37 and the second stop switch 32 in the leap state, as shown in the figure. 15 is energized. This energization causes the motor 15 to operate and the eccentric body 2l to rotate in the direction of the arrow. When the pushing part 22a comes into contact with the arm lever 24 due to the rotation of the eccentric body 21, the arm lever 24 is rotated clockwise. Also, the arm lever 23 has a release portion 22c.
Rotates clockwise by coming into contact with
Rotate the linking lever 27 counterclockwise. The above movement of the linking lever 27 causes the valve ill to move away from the first valve seat 6 and toward the second valve seat 7. In this process, the third
Fluid flowing into the boat 5 flows into both the first boat 3 and the second boat 4. The above-described movement continues, and eventually the valve body 11 comes into contact with the second valve seat 7 and begins to be pressed there. When the elastic force of the valve body 1l and the rotational force applied from the arm lever 23 to the linking lever 27 are balanced, the valve body 11 stops moving (second position). Note that when the valve body l1 is pressed against the second valve seat 7 as described above, there is no reaction that is applied to the valve body 11 against the pressing of the valve body l1 against the second valve seat 7, except for a slight frictional resistance. Only the force is applied via the linking lever 27, the arm lever 23, and the spring 26 as a force that presses the arm lever 24 against the pushing part 22a of the religious body 2l. This force becomes a load that resists the rotation of the eccentric body 2l, that is, a load on the motor l5. In other words, the load on motor l5 is only the reaction force of the above pressing. When the valve body H tightly closes the second valve seat 7 as shown in column (c) as described above, the second stop switch 32 is brought into contact with the open portion 30 of the cam switch 29 as shown in the figure. It becomes open state as shown below. As a result, motor l
to 5. The energization is stopped and the motor 15 is in a stopped state.
In this state, a balanced state equivalent to that in case (a) above is achieved (in the explanation for case (a) above, "arm lever 23" is replaced with "arm lever 24", and "arm lever 24" is replaced with "arm lever"). 23” and “clockwise” as “
"Counterclockwise" and "Counterclockwise" and "Clockwise" and "
It is to be understood that "first valve seat 6" is read as "second valve seat 7," respectively.
Boat 4 is in a cut-off state. In this state, for example, fluid flowing into the third boat 5 flows out into the first boat 3 through the hollow portion 2 of the valve body 1. Next, when the operation switch 37 is switched to the first position as shown in column (d), the valve body 1.1 moves away from the second valve seat 7 and moves to the first position by the same operation as in the case of (b) above. Valve seat 6
Head to. Then, the state shown in (a) is reached,
When the rotation of the motor 15 stops, that state is maintained. [Effects of the Invention] As described above, in the present invention, when it is desired to switch the valve, by operating the operation switch 37, the motor 15 is rotated to separate the valve body 1l from the first valve seat 6 and switch the second valve. Since it is pressed against the seat 7 or vice versa, it has the operational advantage of being extremely easy to switch. Moreover, as mentioned above, the movement of the valve body l1 from the first valve seat 6 to the second valve seat 7 and the opposite movement are both carried out by the motor.
5, when switching to either side as described above, when pressing the valve element l1 against the first valve seat 6 or the second valve seat 7, the load applied to the motor 15 will cause the valve element to press against the valve seat. There is only a reaction force against pressing,
The motor 15 only needs to have a small torque sufficient to overcome the reaction force, which has the effect of making it possible to use a small motor. Moreover, when the valve body is pressed against the valve seat, a reaction force against the pressing is continuously applied to the pressing portion 22 of the eccentric body 2l.
However, since the pressing portion 22b is at the dead center, it has the advantage of being able to block the reaction force from being transmitted to the motor l5 side. This means that the pressed state can be maintained without any force being generated by the motor l5, which has the advantage of solving the problems of the prior art and maintaining the switching state of the valve with no energy. .

[Brief explanation of the drawing]

The drawings show an embodiment of the present application, and Fig. Y is a longitudinal cross-sectional view;
2 is an exploded perspective view, FIG. 3 is a plan view of the switch 8l structure, FIG. 4 is a plan view of the conversion mechanism, FIG. 5 is a plan view of the valve, and FIG. 6 is an explanatory diagram of the operation. 6... First valve seat, 7... Second valve seat, 11... Valve book, ■5... Motor, 2l... Candle body, 22b...
Pressing portion, 37...operation switch. Figure 3 Figure j1 Cow Figure 5

Claims (1)

[Claims] The first valve seat and the second valve seat are moved to the first position where they are pressed against the first valve seat to block it, and to the second position where they are pressed against the second valve seat to block it. In the switching valve, the switching valve includes a freely movable valve body and an operation mechanism configured to change the position of the valve body between the first position and the second position, wherein the operation mechanism is rotated by being energized through the operation switch. and an eccentric body that is rotated by the motor, and a pressing portion of the eccentric body moves the valve body between the first position and the first position by the rotation of the eccentric body. The pressing part is connected to the valve body so that the valve body can be moved to the first position and the second position, and the pressing part is connected to the center of rotation of the eccentric body when the valve body is in the first position and the second position. The operating mechanism is a stop switch mechanism configured to cut off the power to the motor when the valve body is in the first position and in the second position, respectively. A switching valve characterized by having: