JPS63303278A - Four-way selector valve - Google Patents

Abstract

PURPOSE:To remove a slidable part and permit the captioned valve to be operated by a small switching operation force by installing a valve body onto the front and back surfaces of the both top edge parts of a valve arm which can shift, elevate and lower. CONSTITUTION:In the nonconduction state of a solenoid 14 to a coil 16, a valve arm 12 is lowered by the force of a compression spring 17. In this state, the pressure fluid supplied from a compressed air source P is introduced into a diaphragm chamber 23r from an inport 23, and sent into a pressure chamber 32 from a feeding port 27. A pressure chamber 31 communicates to a discharge port 24 through a feeding port 26 and the diaphragm chamber 24r. Therefore, the valve arm 12 is applied with a turning moment in the clockwise direction, and can surely close a discharge port 25 onto which the fluid pressure supplied from the compressed air source is applied.

Description

Detailed Description of the Invention "Technical Field" The present invention selectively connects a pair of input ports connected to a pressure fluid source to a pair of supply ports, and connects a pair of supply ports that are not connected to the pressure fluid source to a pair of supply ports. The present invention relates to a four-way switching valve that selectively communicates with the discharge ports of the four-way switching valve.

"Prior art and its problems" This type of four-way switching valve that satisfies its functions is already known. However, conventional products have sliding parts such as spool valves, and therefore have unavoidable problems such as high processing costs, unavoidable wear, and deterioration of sealing performance due to wear. In addition, in recent years, there has been an increasing need for sanitary valves that do not allow minute foreign matter to enter the pressure fluid, and it is difficult to obtain sanitary valves with these sliding parts.

Generally speaking, conventional products require a relatively large force as a driving force for switching the flow path, and therefore, for example, when a solenoid is used as a driving source, there is a problem in that a large solenoid is required.

``Object of the Invention'' The purpose of the present invention is to solve the problems of the conventional products, and to obtain a four-way switching valve that has no sliding parts, operates with a small switching force, and can be applied to sanitary valves. do.

``Summary of the Invention'' The present invention provides a four-way switching valve having the above-mentioned functions, including a valve arm that can swing and move up and down, an actuator that moves up and down the valve arm, and an actuator that moves up and down the front end of the valve arm. , the above pair of import and exhaust ports, which are opened with the vertical relationship reversed, are fixed to the front and back of the image tip of this valve arm, and one of the import ports is closed in response to the elevation and descent of the valve arm. and a valve body that opens the other discharge port, and a rotating moment is applied to this valve arm by the pressure of the pressure fluid applied to the valve body from the import, regardless of its vertical position. There is.

The valve body may consist of a dianorum which is open or has a larger pressure receiving area than when the import and discharge ports are closed, which allows the pressure fluid to flow into the valve arm chamber housing the valve arm. By blocking this, a sanitary valve can be constructed.

"Embodiments of the Invention" The present invention will be described below with reference to illustrated embodiments. FIGS. 1 and 2 show embodiments of the four-way switching valve of the present invention, and show mutually different operating states.

A valve arm 12 is provided at the center of the housing 11, and the valve arm 12 is sandwiched between a compression spring 3 and a plunger 15 of a solenoid 14, and is capable of vertical movement and rocking displacement. ing.

The solenoid 14, which serves as an actuator for raising and lowering the valve arm 12, lowers the valve arm by protruding the plunger 15 by the force of the compression spring 17 when the coil 16 is not energized, and when the coil 16 is energized, the plunger 15 is attracted. The valve arm 12 moves backward due to the force of the compression spring 13. The force of the compression spring 17 is stronger than the force of the compression spring 13.

Piston bodies 8 and 19 are fixed to the left and right ends of the valve arm 12, respectively, and the piston bodies 18 and 19 are movably fitted into sliding holes 20 and 21 of the housing 11, respectively.

On the other hand, on the upper and lower sides of the left and right ends of this valve arm 12, there are an import port 22.23 and a discharge port 24.25, respectively.
The vertical relationship is reversed from left to right, and the opening is opened. Import 22; J3 and 23 are connected to compressed air source P. The open ends of these ports 22-25 constitute valve seats 22s-25s, and these valve seats 22s-25s
Dianoram chambers 72r to 25r are formed around the outer periphery.

Of these, the diaphragm chambers 22r and 24r communicate with the supply port 26, respectively, and the diaphragm chambers 23r and 25r
is in communication with another supply port 27.

The supply ports 26 and 27 communicate with left and right pressure chambers 31 and 32, respectively, of the cylinder assembly W30 shown as an actuator, and when pressure fluid is sent to the pressure chamber 31 through the supply port 26, the piston 33 moves as shown in the figure. Go left,
When pressure fluid is sent to the pressure chamber 32 through the supply port 27, the pressure fluid 33 moves to the right.

Each of the diaphragm chambers 22r to 25r is provided with a thick-walled valve portion in the center thereof or a dianoram 22d to 25d that approaches and separates from the valve seats 22s to 25s. These diaphragms 22d-25d connect the pressure fluid path to the valve arm 12.
It is isolated from the valve arm chamber 28 which houses the valve arm chamber 28. Further, these dianorams 22d to 25d are connected to the ports 22 to 25 when seated on the corresponding valve seats 22s to 25s.
When the valve seats 22s to 25s are unseated, they receive pressure from a pressure receiving area Ds corresponding to their effective diameter. It is clearly Os>.

Then, the piston bodies 18 and 19 at both ends of the valve arm 12 are
The upper and lower diaphragms 24d and 226 and diaphragms 23d and 25d are connected to each other, and by raising and lowering the valve arm 12, the diaphragms 22d to 25d are moved to the valve seat 22.
s to 25 s to sit or leave the seat.

The present four-way switching valve configured as described above operates as follows. First, when the coil 16 of the solenoid 14 is in a de-energized state, the valve arm 12 is in the state shown in FIG. 1 in which it is lowered by the force of the compression spring 17.

That is, by the piston bodies 18 and 19, the diano ram 2
2d and 25d are pushed downward and seated on valve seats 22s and 25s, respectively. In this state, the diaphragms 23d and 24d are separated from the valve seats 23s and 24s. Pressure fluid from the compressed air source P thus enters the dianoram chamber 23r through the import 23 and is sent to the pressure chamber 32 through the supply port 27. At this time, pressure chamber 3] is connected to supply port 2.
6 and the diaphragm chamber 24r''i#, the piston 33 moves to the left.

One of the features of the present invention is that in this state, the valve arm 1
In other words, the diaphragm 23d receives pressure from the compressed air source P through the pressure receiving area Ds corresponding to its effective diameter, while the , the pressure from the compressed air source P is applied by the pressure receiving area Os minus the daytime.The magnitude of this pressure receiving area is shown in FIG. 3(A).Therefore, it is clear that the valve arm 12 Since a clockwise moment is added, especially diaphragm 2
5d and the valve seat 25s can be improved. In other words, since the discharge port 25 to which the fluid pressure from the compressed air source is applied can be reliably closed, the actuator such as the Schilling device 3o can be operated reliably, and therefore the pressure fluid on the supply side can be closed. It is extremely effective as a sanitary valve that does not allow leakage.

On the other hand, when the coil 16 of the solenoid 14 is energized, the plunger 15 is pulled against the force of the compression spring 17, and the valve arm 12 is displaced upward by the force of the compression spring 13 (FIG. 2). Then, the diaphragms 23d and 246 are pushed downward by the piston bodies 18 and 19, and the valve seat 23
S and 24s respectively, and diaphragms 22d and 2
5d is separated from the valve seats 22s and 25s. Pressure fluid from the compressed air source P thus enters the dianoram chamber 22r through the import 22 and is sent to the pressure chamber 31 through the supply port 26. At this time, the pressure chamber 32 is connected to the supply port 27
and exhaust port 25 via dianoram chamber 25r78
The piston 33 moves to the right.

Even in this state, a rotational moment in the clockwise direction in FIG. 2 is applied to the valve arm 12. That is, Dianorum 2
The pressure from the compressed air source P is applied to the diaphragm 2d with a pressure receiving area Ds corresponding to its effective diameter, whereas the diaphragm 24
The pressure from the compressed air source P is applied to d 73 and 23d by a pressure receiving area obtained by subtracting As from the pressure receiving area Ds. FIG. 3 (8) shows the size of this pressure receiving area. Therefore, since a clockwise moment is clearly applied to the valve arm 12, it is possible to particularly improve the sealing performance between the diaphragm 24d and the valve seat 24s. This diaphragm 24d
The exhaust port 24, which is closed by the valve seat 24s, is also a port to which pressurized fluid pressure from the compressed air source P is applied. Therefore, by reliably closing the discharge port 24 to which fluid pressure is applied, just as when the solenoid 14 is de-energized, the actuators such as the cylinder device 30 are reliably operated, and the pressure fluid on the supply side is released. It can be suitably used as a sanitary valve that does not allow leakage.

Roughly speaking, when a rotational moment is applied to the valve arm 12 regardless of its direction of movement, the valve arm 12
The switching driving force for driving can be reduced. In other words, 't5 In this embodiment, the small node 1
It is possible to drive it by 4. Furthermore, since the valve arm chamber 28 and the pressure fluid passages of the ports 22 to 25 are isolated by the diaphragms 22d to 25d, the valve operating portion does not come into contact with pressure fluid, making it suitable as a sanitary valve.

"Effects of the Invention" As described above, the four-way switching valve of the present invention has no sliding parts, so stable performance can be obtained over a long period of time, and the valve arm
Since a rotational moment is always applied regardless of the movement position, an effect similar to a self-sealing mechanism and the ability to perform switching with a small switching force can be obtained. In addition, by using a diaphragm as the valve body, it has excellent effects such as preventing contact between the valve operating part and pressure fluid and allowing it to be used as sanitary pulp.

[Brief explanation of the drawing]

FIGS. 1 and 2 show an embodiment (A) of the four-way switching valve of the present invention,
(B) is a skeleton diagram illustrating the magnitude of the rotational moment applied to the valve arm in the states of FIGS. 1 and 2, respectively. 11...Housing, 12...Valve arm, 13...
- Compression spring, 14... Nlenoid, 15... Plunger, 16... Coil, 17... Compression spring, 18.
19...Piston body, 22.23...Import,
24.25...Discharge port, 22s~25s...Valve seat, 22r~25r...Diaphragm chamber, 22d~2
5d...Diaphragm, 26.27...Supply port, 28...Valve arm chamber, 30...Cylinder device, 3
], 32...pressure chamber, 33...piston. Patent applicant: Fujikura Rubber Industries Co., Ltd. Agents: Kunio Miura and Shigeru Matsui

Claims (2)

[Claims] (1) A pair of import ports connected to a pressure fluid source are selectively connected to a pair of supply ports, and a supply port on the side not connected to a pressure fluid source is selectively connected to a pair of discharge ports. In a switching valve, a valve arm that can be oscillated and moved up and down; an actuator that raises and lowers this valve arm; the above pair of import and discharge ports that are opened at the top and bottom of both ends of this valve arm, respectively, with the vertical relationship reversed. A port; and a valve body which is fixed to the front and back of both ends of the valve arm and closes one of the import ports and opens the other discharge port as the valve arm moves up and down. A four-way switching valve characterized in that a rotational moment is applied by the pressure of the pressure fluid applied to the valve body from the import regardless of its vertical position. (2) In claim 1, the valve body is composed of a diaphragm that has a larger pressure receiving area when the import and discharge ports are open than when they are closed, and the diaphragm is configured such that the pressure fluid accommodates the valve arm. A four-way switching valve that prevents water from flowing into the valve arm chamber.