JP2004278566A - Channel switching valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a channel switching valve for miniaturizing a valve structure and reducing manufacturing costs. <P>SOLUTION: The channel switching valve selectively switches a first channel A reaching a second port 2 from a first port 1, and a second channel B reaching a third port 3 from the first port 1 by projecting the first and second ports 1, 2 on a sidewall section 1a of a body pipe section 4 in a direction for orthogonally crossing the axial direction of the body pipe section 4, and projecting the third port 3 at one end section of the body pipe section 4 in the axial direction of the body pipe section 4. An operation shaft 6 reciprocating in an axial direction is arranged inside the body pipe section 4, a valve element 7 for opening a first channel A and closing a second channel B in a forward motion and for closing the first channel A and opening the second channel B in a backward motion is provided at one end side of the operation shaft 6, and a diaphragm 7 for constantly blocking the other end section of the body pipe section 4 is provided at the other end side of the operation shaft 6. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a flow path switching valve using a diaphragm, and includes a first flow path between a first port and a second port among three ports of a first port, a second port, and a third port. The present invention relates to a flow path switching valve that selectively switches between a second flow path between a second port and a third port, and is used for various liquid pipes in the food industry, the pharmaceutical industry, and the like.
[0002]
[Prior art]
With the flow path switching valve having three ports as described above, the first flow path between the first port and the second port and the second flow path between the second port and the third port are selected. The conventional flow path switching valve that switches selectively includes two diaphragms that are individually operated by respective driving means. If the first flow path is closed by one diaphragm, the second flow path is opened by the other diaphragm. Further, an operation is performed in which one diaphragm opens the first flow passage and the other diaphragm closes the second flow passage (for example, see Patent Document 1).
[0003]
[Patent Document 1]
JP-A-8-312813
[Problems to be solved by the invention]
Since the conventional flow path switching valve is provided with two diaphragms which are individually operated by the respective driving means, two driving means are required, so that the valve structure becomes large and the manufacturing cost is reduced. There is a problem that it is expensive.
[0005]
SUMMARY OF THE INVENTION In view of the above problems, the present invention achieves a reduction in the size of a valve structure and a reduction in manufacturing cost by switching a flow path in one operation of forward or backward movement of an operating shaft by one drive unit. It is another object of the present invention to provide a flow path switching valve that can be reduced in cost.
[0006]
[Means for Solving the Problems]
According to the first aspect of the present invention, the first port 1 and the second port 2 are provided on the side wall 4 a of the main body tube 4 in a direction orthogonal to the axial direction of the main body tube 4, and are close to the first port 1. A third port 3 is provided at one end of the main body tube 4 on the side of the main body 4 so as to protrude in the axial direction of the main body tube 4, and a first flow path A from the first port 1 to the second port 2 is provided. A flow path switching valve for selectively switching between a first flow path B and a second flow path B from the first port 3 to the third port 3, and an operating shaft 6 connected to a driving means 5 and reciprocating in an axial direction in a main body pipe portion 4. At the one end of the operating shaft 6, the first flow path A is opened and the second flow path B is closed at the time of forward movement or backward movement, and the first flow path A is closed at the time of backward movement or forward movement. A valve element 7 for opening the second flow path B is provided, and a diaphragm 8 for always closing the other end of the main body tube 4 is provided on the other end of the operating shaft 6.
[0007]
According to a second aspect of the present invention, in the flow path switching valve according to the first aspect, the wetted portions of the operating shaft 6, the valve body 7 and the diaphragm 8 are each formed by a film 11 made of a fluororesin. The coating portion 11a, the coating portion 11b on the valve element 7 side, and the coating portion 11c on the diaphragm 8 side are integrally formed.
[0008]
According to a third aspect, in the flow path switching valve according to the first or second aspect, the valve element 7 is formed integrally with the operating shaft 6.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a partially sectional front view showing an embodiment of a flow path switching valve according to the present invention, and FIG. 2 is a partially enlarged view of the flow path switching valve shown in FIG. In these figures, reference numeral 4 denotes a main body tube, and the first port 1 and the second port 2 are opposite to each other in a direction orthogonal to the axial direction of the main body tube 4 on the side wall 4a. A third port 3 protrudes concentrically in the axial direction of the main body tube 4 at one end of the main body tube 4, that is, at an end near the first port 1. . In the figure, A is a first flow path from the first port 1 to the second port 2, and B is a second flow path from the first port 1 to the third port 3.
[0010]
The flow path switching valve selectively switches between the first flow path A and the second flow path B, and is reciprocated in the main body pipe part 4 in the axial direction of the main body pipe part 4 by the driving means 5. An operation shaft 6 is disposed, and one end of the operation shaft 6 opens the first flow path A during the forward movement (when moving from right to left with respect to FIGS. 1 and 2), and opens the second flow path B And a valve element 7 that closes the first flow path A and opens the second flow path B at the time of return is disposed, and the other end of the main body 4 is always closed at the other end of the operating shaft 6. A diaphragm 8 is provided. In this embodiment, the first flow path A is opened and the second flow path B is closed when the operating shaft 6 moves forward. The passage A may be opened and the second passage B may be closed.
[0011]
The drive means 5 for reciprocatingly driving the operating shaft 6 is, for example, an air cylinder. A connecting rod 12 connected to a piston rod of the cylinder is linked to the other end of the operating shaft 6 via a rod pin 9. I have. The operating shaft 6 moves forward by the driving of the driving means 5, and the valve body 7 moves from the position indicated by the imaginary line in FIG. 2 to the position indicated by the solid line. The two flow paths B are closed, and the operating shaft 6 is moved back, and the valve body 7 moves from the position shown in the solid line to the position shown in the phantom line, whereby the first flow path A is closed and the second flow path B is opened. Will be.
[0012]
The valve element 7 includes a first valve element 7a that opens and closes the first flow path A and a second valve element 7b that opens and closes the second flow path B. The first valve element 7a is located in the main pipe 4. The second valve body portion 7b comes into contact with and separates from the provided first valve seat 10a, and the second valve body portion 7b comes into contact with and separates from the second valve seat 10b provided at the inner end of the third port 3.
[0013]
The operating shaft 6 and the valve body 7 are integrally formed of a metal material such as stainless steel, and their liquid contact portions are integrally formed in a thick layer by a film 11 made of Teflon (registered trademark) which is a fluororesin. Have been. The coating 11 forms the liquid contact portion of the operating shaft 6 and the valve element 7 in a thick layer, and also forms the liquid contact portion of the diaphragm 8 in a thin layer. Thus, the film 11 is an integrally formed product composed of a film portion 11a on the operating shaft 6, a film portion 11b on the valve body 7, and a film portion 11c on the diaphragm 8 side.
[0014]
The diaphragm 8 is composed of a coating portion 11c integrally extending from the thick coating portion 11a on the operating shaft 6 side, and a synthetic rubber backup rubber 13 disposed on the back side of the coating portion 11c. A disk-shaped holding plate 14 for holding the backup rubber 13 from the rear side is attached to the connecting rod 12.
[0015]
The center of the diaphragm 8 is fitted and attached over the other end of the operating shaft 6 and the rod pin 9, and its outer peripheral edge is connected to the other end of the main body tube 4 and the end of the mounting tube 15. In the state of being sandwiched, the end flange 18 on the main body pipe part 4 side and the end flange 19 on the mounting pipe 15 side are attached by clamping with a clamp 20. The diaphragm 8 is elastically deformed from the state shown by the solid line in FIG. 2 to the state shown by the phantom line in FIG. 2 with the reciprocation of the operating shaft 6 driven by the driving means 5. A flange 16 is integrally formed at the base end of the third port 3, and the flange 16 is engaged with the end flange 17 on the side of the main body tube 4 and joined by the clamp 21, and It is attached and fixed to one end of the part 4.
[0016]
At the time of assembling this flow path switching valve, the operating shaft 6 and the valve body 7 with the film 11 applied thereto are inserted into the main body tube part 4 from one end thereof, and then the holding rod attached to the connecting rod 12 and the rod pin 9. The plate 14 and the backup rubber 14 are arranged on the other end side of the main body tube portion 4, the rod pin 9 is screwed and connected to the operating shaft 6, and the backup rubber 14 is superposed on the back surface of the coating portion 11 c of the coating 11. Thereafter, the third port 3 is attached to one end of the main body tube 4, and the attachment tube 15 is attached to the other end of the main body tube 4. Further, the mounting pipe 15 is mounted on the casing 23 by engaging the end flange 22 with a mounting flange 24 provided on the casing 23 of the driving means 5 and tightening with the clamp 25.
[0017]
In the use of the flow path switching valve configured as described above, when the valve element 7 is at the position shown by the solid line in FIG. 2, the first valve element portion 7a is moved from the first valve seat 10a. The first flow path A is opened while being separated, and the second valve body 7b is in contact with the second valve seat 10b to close the second flow path B. Therefore, the liquid supplied from the first port 1 flows out of the second port 2 through the opened first flow path A.
[0018]
When the operating shaft 6 is moved back by the driving means 5 from the state in which the first flow path A is opened, and the valve body 7 moves from the position shown by the solid line in FIG. 2 to the position shown by the phantom line in FIG. The first flow path A is closed in contact with the first valve seat 10a, the second valve body 7b is separated from the second valve seat 10b, and the second flow path B is opened. Accordingly, the flow path is switched from the first flow path A to the second flow path B, and the liquid supplied from the first port 1 flows out of the third port 3 through the second flow path B. .
[0019]
Thus, according to this flow path switching valve, the flow path between the first flow path A and the second flow path B can be switched by one operation of the forward and backward movements of the operating shaft 6 by one driving means 5. Therefore, the flow path switching operation can be performed quickly and accurately, and only one drive means 5 is required, so that the valve structure can be downsized and the manufacturing cost can be reduced. become.
[0020]
Further, in this flow path switching valve, since the liquid contacting portions of the operating shaft 6, the valve body 7 and the diaphragm 8 are formed by the film 11 made of fluororesin, the flowing liquid is a metal corrosive chemical. In this case, the operating shaft 6, the valve element 7, or the diaphragm 8 is not corroded. Further, even when the flowing liquid is a high-temperature liquid, the diaphragm 8 is not thermally deteriorated, and the inside of the switching valve is easily cleaned.
[0021]
In particular, in this flow path switching valve, the film 11 is an integrally formed product composed of a film portion 11a on the operating shaft 6 side, a film portion 11b on the valve body 7 side, and a film portion 11c on the diaphragm 8 side. There is no possibility that liquid scum or the like remains or accumulates, and the inside of the switching valve is more easily cleaned, which is extremely effective for sanitation. Further, since the valve body 7 is formed integrally with the operating shaft 6, the valve body 7 and the operating shaft 6 can be easily manufactured, and the film 11 can be easily formed on the valve body 7 and the operating shaft 6. Become.
[0022]
FIG. 3 is a partial sectional front view showing another embodiment of the flow path switching valve according to the present invention. In the flow path switching valve shown in FIGS. 1 and 2, the first port 1 and the second port 2 are provided on both sides of the side wall 4a of the main body pipe section 4 so as to project in opposite directions. In the switching valve, the first port 1 and the second port 2 are protruded from one side of the side wall portion 4a of the main body tube portion 4 in the same direction adjacent to each other. Only this point is different. This is almost the same as the flow path switching valve of No. 3. Therefore, the same reference numerals are given to the same members, and the description thereof will be omitted.
[0023]
In this flow path switching valve, when the operating shaft 6 moves forward and the valve element 7 is at the position shown by the solid line in FIG. 3, the first valve element portion 7a is separated from the first valve seat 10a and the first flow path A Is opened, the second valve body 7b contacts the second valve seat 10b, and the second flow path B is closed. Therefore, the liquid supplied from the first port 1 flows out of the second port 2 through the first flow path A. From this state, when the operating shaft 6 is moved back by the driving means 5 and the valve body 7 moves from the position shown by the solid line to the position shown by the phantom line, the first valve body portion 7a comes into contact with the first valve seat 10a and the first flow The path A is closed, the second valve body 7b is separated from the second valve seat 10b, and the second flow path B is opened. Therefore, the flow path is switched from the first flow path A to the second flow path B, and the liquid supplied from the first port 1 passes through the second flow path B and exits from the third port 3. .
[0024]
【The invention's effect】
According to the flow path switching valve according to the first aspect of the invention, the flow path between the first flow path and the second flow path can be switched by one operation of the forward and backward movements of the operating shaft by one driving means. Therefore, the flow path switching operation can be performed quickly and accurately. In addition, since only one driving means is required, the size of the valve structure can be reduced, and the manufacturing cost can be reduced.
[0025]
According to the invention according to claim 2, the liquid contacting portions of the operating shaft, the valve body and the diaphragm are each formed by a film made of fluororesin, and the film portion on the operating shaft side, the film portion on the valve body side, and the film side on the diaphragm side. Since the coating and the film are integrally formed, there is no possibility that various kinds of liquid slag adheres or remains on these operating shafts, the valve body and the diaphragm, and the inside of the switching valve is further cleaned. It is easy and very effective for hygiene.
[0026]
According to the third aspect of the present invention, since the valve body is formed integrally with the operating shaft, it is easy to manufacture the valve body and the operating shaft, and it is easy to form a film on the valve body and the operating shaft. Become.
[Brief description of the drawings]
FIG. 1 is a partially sectional front view showing an embodiment of a flow path switching valve according to the present invention.
FIG. 2 is a partially enlarged view of the flow path switching valve shown in FIG.
FIG. 3 is a partially sectional front view showing another embodiment of the flow path switching valve according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 1st port 2 2nd port 3 3rd port A 1st flow path B 2nd flow path 4 Main pipe part 5 Drive means 6 Operating shaft 7 Valve body 8 Diaphragm 11 Coating 11a Coating part 11b on the operating shaft side Film part 11c Film part on diaphragm side

Claims (3)

A first port and a second port are provided on a side wall of the main body pipe in a direction perpendicular to an axial direction of the main body pipe, and a third port is provided on one end of the main body near the first port. A flow path switching valve protruding in the axial direction of the pipe portion and selectively switching a first flow path from the first port to the second port and a second flow path from the first port to the third port. An operating shaft connected to the driving means and reciprocating in the axial direction is disposed in the main body tube, and a first flow path is opened at one end of the operating shaft at the time of forward movement or backward movement to open the second passage. A diaphragm that closes the flow path, closes the first flow path and opens the second flow path at the time of backward movement or forward movement, and always closes the other end of the main body pipe at the other end of the operating shaft. A flow path switching valve provided with: The wetted portions of the operating shaft, the valve body, and the diaphragm are each formed of a film made of fluororesin, and the operating shaft side film portion, the valve body side film portion, and the diaphragm side film portion are integrally formed. The flow path switching valve according to claim 2. The flow path switching valve according to claim 1, wherein the valve body is formed integrally with the operating shaft.

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