JPH0416001Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a manifold type switching valve with a backflow prevention means.

[Prior Art] Generally, in a cylinder drive system using a central exhaust type manifold, a plurality of cylinders are connected to the manifold via valves that can be switched and driven independently, and each cylinder is driven independently. Further, exhaust gas from each cylinder is centrally exhausted to a central exhaust passage of the manifold via a valve connected thereto. Therefore, the cylinders are in communication with each other via the concentrated exhaust passage of the manifold, and there is a risk that the exhaust from one cylinder may act on the other cylinders and cause them to malfunction.

To prevent this, for example,
- As shown in Publication No. 120403, an adapter (intermediate plate) provided with a backflow prevention means is interposed between each valve connected to each of a plurality of cylinders and the manifold to which those valves are attached. What has been done is publicly known. However, the device described in the above publication uses a structure in which the sliding valve body is biased toward the valve seat by a spring compressed between the sliding valve body and the spring seat body as a backflow prevention means, and this is attached to an adapter. Because it is located inside the device, it has the following drawbacks:

(1) The adapter provided with the backflow prevention means makes the entire valve large and expensive.

(2) The adapter incorporates a backflow prevention means that urges the valve body against the valve seat using a spring, which increases the number of parts and complicates assembly work.

(3) The above-mentioned backflow prevention means slides the valve body inside the means, thereby bringing the valve body into contact with and separating from the valve seat to open and close the flow path. Therefore, sliding and contact are repeated. However, wear and damage to each member is inevitable, and it is difficult to maintain proper backflow prevention function over a long period of time.

[Problem to be solved by the invention] The problem to be solved by the invention is to provide a backflow prevention means to a sealing member made of an elastic material that is necessarily sandwiched between a manifold and each valve attached thereto. To provide a manifold type switching valve with a backflow prevention means, which suppresses an increase in the size of the entire valve and an increase in the number of parts, and at the same time, simplifies assembly work by positioning a seal member using the backflow prevention means. It is in.

[Means for Solving the Problems] In order to solve the above problems, the manifold type switching valve with a backflow prevention means of the present invention has a centralized supply path for pressurized fluid, a pair of centralized exhaust paths, and branches from these flow paths. a manifold having a plurality of supply communication paths and exhaust communication paths, a plurality of valves attached to the manifold, and a sealing member made of an elastic material sandwiched between the manifold and the valves, In a manifold-type switching valve that centrally exhausts exhaust gas from a manifold into a pair of central exhaust passages, the sealing member connects a supply hole that communicates the supply communication passage with a valve supply passage, and a supply hole that communicates the supply communication passage with a valve supply passage; backflow prevention means between each of the exhaust communication passages in the central exhaust passage, the backflow prevention means having a base that projects toward the exhaust communication passage integrally with the seal member and that fits into the pair of exhaust communication passages, respectively. It is formed by a funnel-shaped cylindrical body and a slit cut at the tip of the cylinder, and is expanded by the exhaust flow from the valve toward the manifold and closed by the exhaust flow in the opposite direction. A technical measure is adopted in which a movable valve body is provided, which positions the sealing member on the manifold by fitting the base of the cylinder into the channel.

[Function] The exhaust flow from the valve to the manifold spreads out the movable valve body provided integrally with the seal member and flows freely into the central exhaust passage of the manifold, while the manifold exhaust flow in the opposite direction to the above. Even if a flow occurs, the exhaust flow deforms the movable valve body to close the exhaust communication passage, thereby blocking the flow.

The movable valve body is integrally provided with a sealing member made of an elastic material that is sandwiched between the manifold and the valve, so simply molding only the sealing member into the desired shape can increase the size of the entire valve. There is no increase in the number of parts.

Furthermore, by assembling a sealing member between the manifold and the valve, a backflow prevention means integrated with the sealing member is simultaneously assembled, and the movable valve body is connected so that its base is connected to the pair of exhaust communication passages. Since they are formed by funnel-shaped cylinders that fit into each other, the seal member is positioned on the manifold only by fitting the movable valve bodies into the pair of exhaust communication passages, and in that case, the movable Since the valve body is formed of a funnel-shaped cylinder, the cylinder acts as a guide, making it possible to easily position the seal member and the supply hole provided therein, not just the movable valve body. Become.

[Effects of the Invention] According to the manifold type switching valve with a backflow prevention means of the present invention, the following effects can be obtained.

(1) A backflow prevention means is integrated into the seal member that is necessarily sandwiched between the manifold and the valve attached to it to prevent leakage, so the number of parts is reduced compared to conventional ones. Not only does it not increase in size, but the overall size also does not change, making it possible to obtain a product that is superior in terms of economy.

(2) When the seal member is assembled, the backflow prevention means is also assembled integrally with the seal member, so the assembly work is extremely simple and easy, compared to the case where each check valve is assembled separately from the seal member.

(3) Since the bases of the cylinders in the pair of movable valve bodies are formed to fit into the pair of exhaust communication passages, the manifold positioning of the sealing member on the manifold, i.e., positioning of the sealing member relative to the supply hole with respect to the supply communication path of the manifold, the movable valve body with respect to each exhaust communication path, the sealing portion on the manifold,
In this case, since the movable valve body is formed of a funnel-shaped cylinder, the cylinder acts as a guide and can be positioned extremely easily. The exhaust flow path is opened and closed by the elastic deformation of Since it does not open or close a path, there is less risk of wear or damage, and high reliability can be maintained over a long period of time.

[Embodiments] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Fig. 1 shows a cylinder-driven type of central exhaust type, where 1 is a manifold, 2,... are valves, 3,... ... is a cylinder, cylinder port 4 of valve 2 attached to manifold 1,
The cylinder 3 is connected to each of the cylinders 4 and 4.

The manifold 1 is provided with a central supply passage 5 and a pair of central exhaust passages 6, 6 therein, connects the central supply passage 5 to an air source (not shown), and connects the central exhaust passages 6, 6 to an air source (not shown). I try to open it to the atmosphere. As shown in FIG. 2, a supply communication path 8 and exhaust communication paths 9, 9 are branched at right angles from each of the above-mentioned concentrated supply paths and concentrated exhaust paths, and an opening is provided in the upper surface of the manifold in these communication paths. I'm letting you do it.

As shown in FIG. 2, a valve 2 is attached to the upper surface of the manifold 1 via a seal member 12 made of an elastic material. The seal member 12
As can be seen from FIGS. 2 and 3, a supply hole 13 is provided in the center, and backflow prevention means 14 are provided in a pair of exhaust passages on both sides of the supply hole 13.
The backflow prevention means 14 includes a funnel-shaped movable cylinder 17 that integrally projects from the sealing member 12 toward the exhaust communication passages 9, 9.
By cutting a slit 18 at the tip of the cylindrical body 17, the tip is provided with a pair of movable valve bodies 19, 19 facing each other with the slit 18 in between. The base portion 17a of the cylindrical body 17 in these movable valve bodies 19 fits into each of the pair of exhaust communication passages, and therefore, the seal member 12 when the seal member 12 is assembled on the manifold.
It also has the function of positioning.

As shown in FIG. 4, the backflow prevention means 14 is configured such that the pair of movable valve bodies 19, 19 are elastically deformed by the exhaust flow in the direction from the valve toward the manifold, and the slit 18 is pushed out into a circular shape. The flow path is opened, and as shown in FIG. 5, the pair of movable valve bodies 19, 19 are returned to deformation due to the exhaust flow in the opposite direction to the above, and press against each other, closing the slit 18 and closing the flow path. It functions like this.

The valve 2 includes a solenoid 21 and a valve body 22 having a flow path switched by the solenoid 21. The valve body 22 is provided with a supply path 23 and a pair of exhaust paths 24, 24, and a pair of cylinder ports. 4, 4, and by energizing the solenoid 21, a valve body (not shown) is driven to switch the supply path 23 to one of the output paths, and simultaneously connect the other output path. It is designed to be switched and communicated with the exhaust path.

The cylinder ports 4, 4 can be opened at appropriate positions in the valve 2, but they can also be opened at the end face of the manifold 1 through the interior of the manifold 1.

In the cylinder drive system configured as described above, if the fluid flow path of the valve body 22 is switched by energizing or de-energizing the solenoid 21 of each valve 2, each cylinder 3 is driven independently. , the exhaust from each cylinder 3 is exhausted from the cylinder port of the valve body 22 to the central exhaust passage 6 through the exhaust passage 24, the backflow prevention means 14 of the seal member 12, and the exhaust communication passage 9 of the manifold 1. The flow from the central exhaust passage 6 through another exhaust communication passage 9 toward the exhaust passage 24 of the valve body 22 attached thereto is blocked by the backflow prevention means 14, so that the cylinders connected to the manifold 1 are Malfunctions will not occur due to exhaust air from the cylinder.

Furthermore, when assembling a manifold type switching valve, simply by assembling the seal member 12 between the manifold 1 and the valve 2, the backflow prevention means 14 integrated with the seal member can be assembled at the same time. The movable valve body 19, in which the bases 17a of the funnel-shaped cylinders 17 are fitted into the communication passages 9, is fitted into the pair of exhaust communication passages 9 with the funnel-shaped cylinders 17 serving as guides. Since the seal member 12 is positioned on the manifold, the seal member 12 can be positioned extremely easily. Particularly when automatically assembling a manifold type switching valve, it is difficult to accurately position the seal member 12 by other means. Even if this is not done, it becomes possible to easily assemble the seal member in a predetermined position.

When the opening shape of each communication path in the manifold is rectangular, as shown in FIGS. 6 and 7, the supply hole 36 and the backflow prevention means 37 formed in the sealing member 35 are movable correspondingly. The shape of the base 38a of the cylindrical body 38 may be rectangular. Therefore, the backflow prevention means 37 has a slit 41 cut at the tip of a pyramid-shaped movable cylinder 38, and is thereby configured to include a pair of movable valve bodies 42, 42.

[Brief explanation of the drawing]

Fig. 1 is an overall configuration diagram of a cylinder drive system incorporating an embodiment of the present invention, Fig. 2 is a partial sectional view taken along the line A-A, Fig. 3 is a plan view of the seal member, Figs. FIG. 5 is a partial sectional view illustrating the function of the sealing member, and FIGS. 6 and 7 are a plan view and a vertical sectional view showing other structural examples of the sealing member. DESCRIPTION OF SYMBOLS 1... Manifold, 2... Valve, 5... Centralized supply path, 6... Centralized exhaust path, 8... Supply connection path, 9... Exhaust connection path, 12, 35... Seal member, 13, 36... ... Supply hole, 14, 37 ... Backflow prevention means, 17, 38 ... Cylindrical body, 17a, 38a
... Base, 18, 41 ... Slit, 19, 42
...Movable valve body, 23... Supply path, 24... Exhaust path.

Claims (1)

[Scope of Claim for Utility Model Registration] A manifold comprising a pressure fluid centralized supply channel, a pair of centralized exhaust channels, and a plurality of supply communication channels and exhaust communication channels branched from these flow channels, respectively;
a plurality of valves attached to the manifold;
A manifold-type switching valve comprising a seal member made of an elastic material sandwiched between the manifold and the valve, and which centrally exhausts exhaust gas from each valve into a pair of central exhaust passages of the manifold, wherein the seal member a supply hole that communicates the communication passage with the supply passage of the valve; and backflow prevention means between the exhaust passage of the valve and each exhaust communication passage in the pair of centralized exhaust passages, the backflow prevention means comprising the sealing member It is formed by a funnel-shaped cylindrical body that protrudes toward the exhaust connecting path side and has a base that fits into a pair of exhaust connecting paths, respectively, and a slit cut in the tip of the cylinder, and extends from the valve to the manifold. It is provided with a movable valve body that expands with the exhaust flow and closes with the exhaust flow in the opposite direction, and positions the sealing member on the manifold by fitting the base of the cylinder into the pair of exhaust communication passages. A manifold type switching valve with a backflow prevention means.