JPH11325302A - Magnet valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a valve opening of a valve element from fluctuating with a flow velocity, and prevent the valve element from seating on a valve seat, by pressing the valve element to a stopper part to be brought into an opened condition when a drive member is located in an opened position. SOLUTION: A valve element 11 is provided inside a pipe body 3, a drive member 12 for displacing the valve element 11 while coupled magnetically with the element 11 is provided outside the pipe body 2. The drive member 12 moves to a closed position for seating the element 11 on a valve seat 3a by a driving device and to an opened position for separating the element 11 from the valve seat 3a. A stopper part 2b for abutting to the element 11 when the element 11 is moved toward the direction separated from the seat 3a is provided, and the opened position of the drive member 12 is set in a position to energize the valve element 11 toward the direction separated further from the valve seat 3a even when the element 11 abuts to the the stopper 2b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnet valve, and more particularly, to a magnet valve that uses a magnetic force of a magnet to open and close a valve.

[0002]

2. Description of the Related Art Conventionally, as a magnetic valve used in an aseptic filling machine, a flow path formed in a housing, a valve seat surrounding the flow path, and a valve seat movably provided in the flow path, A valve member seated on the valve body to close the flow path, a driving member movably provided outside the flow path, and magnetically coupled to the valve body to displace the valve body; It is known that the driving member is connected through a connecting means and has a driving device for moving the driving member between a closed position where the valve element is seated on the valve seat and an open position where the valve element is separated from the valve seat. (U.S. Pat. No. 5,676,676)
344). In the magnet valve having the above configuration, if the driving device moves the driving member to the closed position, the valve body magnetically coupled to the driving member can be seated on the valve seat to close the flow path, Further, if the driving member is located at the open position, the valve body can be separated from the valve seat to open the flow path, so that the filling liquid can be filled in the container.

[0003]

However, in the above-described magnet valve, when the drive member is located at the open position and the valve body is separated from the valve seat, the valve body is in a state of floating in the flow path. Therefore, there is a danger that the valve body is pushed by the flow velocity and the valve opening is fluctuated or the valve is seated on the valve seat, especially when a large flow rate of the filling liquid is allowed to flow. The present invention has been made in view of such circumstances, and provides a magnet valve that can stably hold a valve body at an open position even when a large flow rate of a filling liquid flows.

[0004]

That is, according to the present invention, there is provided a magnet valve having the structure described above, wherein a stopper portion is provided which comes into contact with the valve body when the valve body is moved in a direction away from a valve seat, Further, the open position of the drive member is a position for further urging the valve body in a direction away from the valve seat even if the valve body contacts the stopper.

[0005]

According to the above construction, when the drive member is located at the open position, the valve element separated from the valve seat comes into contact with the stopper portion and is pressed against the stopper portion. Even when the filling liquid is circulated, the valve body can stably be kept pressed against the stopper. Therefore, as compared with the conventional case where the valve element is floating in the flow path, it is possible to reliably prevent the valve opening from fluctuating or being seated on the valve seat.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiment. In FIG. 1, a housing 1 of a magnet valve made of a cylindrical member is arranged in a vertical direction. I have. A tube 3 is provided on the inner shaft portion of the housing 1 below the partition 2, and the upper end of the tube 3 is attached to the lower surface of the partition 2 while maintaining the liquid tightness by a sealing member 4. The lower end of the body 3 is attached to a lower pipe 6 attached to the lower end of the housing 1 by a connection fitting 5 while maintaining a liquid-tight state by a seal member 7. An internal passage 2a bent in an L-shape is formed in the partition wall 2, and an upper end thereof communicates with a filling liquid tank (not shown) via an upper pipe 8. The lower end of the internal passage 2a communicates with the upper part of the pipe 3, and the lower part of the pipe 3 communicates with a filling nozzle (not shown) via the lower pipe 6. The upper pipe 8, the internal passage 2a, and the pipe 3
The lower pipe 6 forms a filling liquid flow path 9.

A valve seat 3a surrounding the flow passage 9 is formed at a lower end portion of the tube 3, and a valve body which is seated on the valve seat 3a and closes the flow passage 9 in the tube 3. 11 is provided slidably in the vertical direction. The lower end of the valve body 11 is a valve portion 11a that sits on the valve seat 3a, and a portion above the valve portion is formed in a cylindrical shape to form a cylindrical portion 11b. Further, a small-diameter neck portion 11c is formed between the valve portion 11a and the cylindrical portion 11b, and an internal passage 11d formed in the cylindrical portion 11b is formed on the outer periphery of the neck portion 11c through a plurality of through holes 11e. It is open. The gap between the inner peripheral surface of the pipe 3 and the outer peripheral surface of the cylindrical portion 11b of the valve body 11, and the internal passage 11d of the valve body 11 and the plurality of through holes 11
e, and a gap between the inner peripheral surface of the tubular body 3 and the outer peripheral surface of the neck portion 11c form a part of the flow path 9. Thus, the neck 11c is formed between the valve portion 11a and the cylindrical portion 11b of the valve body 11, and the internal passage 11d formed inside the valve body 11 is formed through the plurality of through holes 11e. In this case, a sufficient flow passage area can be secured even if the gap between the inner peripheral surface of the tubular body 3 and the outer peripheral surface of the cylindrical portion 11b is narrowed. By narrowing the gap, the radial runout of the valve element 11 can be reduced, thereby suppressing a change in the flow rate and performing high-precision filling. There is an advantage that it can be prevented.

Next, the housing 1 is provided outside the tubular body 3.
The inside of the valve body 1 is magnetically coupled to the valve body 11 to
A driving member 12 for displacing the driving member 1 is provided, and the driving member 12 can be moved up and down by a driving device 13. The driving member 12 is formed of a cylindrical member having upper and lower flange portions 12a and 12b. In the illustrated embodiment, two magnets 14 surrounding the tube 3 are attached to the inner peripheral portion of the driving member 12 at upper and lower positions. I have.
On the other hand, a magnet 14 is provided on the cylindrical portion 11b of the valve body 11.
The magnetic body 15 made of two pieces of iron or the like is buried in accordance with the interval of the above, and the tube 3 is made of a non-magnetic material. Therefore, if the drive member 12 is moved up and down, the valve body 11 magnetically coupled to the magnet 14 can be moved up and down, whereby the valve portion 11a of the valve body 11 can be moved toward and away from the valve seat 3a. .

A driving device 13 for driving the driving member 12
Is arranged above the housing 1 and on the same axis. In the illustrated embodiment, the driving device 13 comprises an air cylinder device. The driving device 13 includes a cylinder housing 22 connected to the housing 1 via a connection fitting 21, and a step formed on a shaft portion of the cylinder housing 22. The hole 23 is provided. A disk-shaped first piston 24 is slidably fitted in the middle diameter hole 23b in the middle of the stepped hole 23 while maintaining airtightness, and is provided at the lower end of the first piston 24. A piston rod 25 is slidably penetrated through a small-diameter hole 23a below the stepped hole 23 while maintaining airtightness. A connecting plate 26 is attached to the lower end of the piston rod 25, and the connecting plate 26 is connected to the upper flange 12 a of the driving member 12 via a connecting rod 27. Therefore, in the present embodiment, a connecting means for connecting the driving device 13 and the driving member 12 is constituted by the piston rod 25, the connecting plate 26 and the connecting rod 27.

As shown in FIGS. 1 and 2, the connecting rods 27 are attached at four places around a connecting plate 26. Each connecting rod 27 is connected to an internal passage 2 formed in the partition 2.
The partition wall 2 is slidably penetrated in the up-down direction avoiding a. A small diameter connecting portion 27a is formed slightly above the lower end surface of each connecting rod 27, and the connecting portion 27a is formed on the upper flange portion 12a of the drive member 12, as shown in FIG. An engagement groove 28 is formed by continuously connecting a small-diameter engaging portion 28a having a size just engaged with the large-diameter penetrating portion 28b allowing the connection rod 27 to pass therethrough in the circumferential direction. . Further, a detent pin 29 is provided upright on the lower pipe 6.
Is slidably penetrated through the lower flange portion 12b of the driving member 12, the driving member 12 rotates, and the connecting portion 27a of the connecting rod 27 is connected to the engaging portion 28 of the engaging groove 28.
A is prevented from being separated from a.

A disk-shaped second piston 31 is slidably fitted in the large-diameter hole 23c above the stepped hole 23 while maintaining airtightness. The lifting rod 32 is connected to the cylinder housing 22 and is slidably penetrated with the lid member 33 closing the upper end of the cylinder housing 22 kept airtight, and is projected upward. Then, a nut 34 is screwed onto the protruding end of the lifting rod 32, and the nut 34
Is brought into contact with an adjusting member 35 provided on the upper end of the lid member 33 so as to be vertically displaceable, so that the lower end position of the second piston 31 can be regulated. A spring 36 is elastically mounted between the first piston 24 and the second piston 31, and the spring 36 normally keeps the two separated from each other, that is, the first piston 24 at the lower end, and the second piston 31 At the rising end. Further, a first pressure chamber 41 is formed below the first piston 24, and the first pressure chamber 41 communicates with a first passage 43 formed in the cylinder housing 22 and a bracket 42 connected thereto, The first passage 4
Numeral 3 is connected to a pressure fluid supply source via a switching valve (not shown). A second pressure chamber 44 is formed between the first piston 24 and the second piston 31. The second pressure chamber 44 communicates with the pressure fluid supply source via a second passage 45 and a switching valve (not shown). The third pressure chamber 46 formed above the second piston 31 further includes a third passage 47.
And is connected to the pressure fluid supply source via a switching valve (not shown). The space accommodating the connection plate 26 is communicated with the atmosphere via an atmosphere passage 48.

Therefore, the intermediate second pressure chamber 44 is communicated with the pressure fluid source, and the first pressure chamber 41 and the third pressure chamber 4
When the first piston 24 is communicated with the atmosphere, the first piston 24 is held at the lower end and the second piston 31 is held at the upper end.
5, the drive member 12 is located at the closed position at the lower end via the connection plate 26 and the connection rod 27, whereby the valve portion 11a of the valve body 11 magnetically coupled to the magnet 14 of the drive member 12 is moved to the valve seat. The channel 9 is closed by sitting on 3a (the state of FIGS. 1 and 4). In addition, the second
When the pressure chamber 44 and the third pressure chamber 46 are communicated with the atmosphere and the first pressure chamber 41 is communicated with a pressure fluid source,
Since the first piston 24 is raised to a position where it comes into contact with the second piston 31 located at the rising end, the drive member 12
Is also greatly raised to the upper open position. As a result, the valve element 11 is also largely separated from the valve seat 3a to open the flow passage 9 with a large opening (the state of FIG. 5). Further, the second
When the pressure chamber 44 is communicated with the atmosphere and the first pressure chamber 41 and the third pressure chamber 46 are communicated with a pressure fluid source,
At the same time when the first piston 24 is raised, the second piston 3
1 is lowered and the two pistons come into contact with each other, but since the pressure receiving area of the second piston 31 is larger, the second piston 31 is at the lower end position, and the first piston 24 is in contact with the second piston 31 at the lower end position. As a result, the ascending position is regulated. In this state, the rising amount of the first piston 24 is smaller than when the second piston 31 is located at the rising end. Therefore, the driving member 12 is provided between the closed position and the open position. Is positioned at the small opening position.
As a result, the valve element 11 is relatively slightly separated from the valve seat 3a, whereby the flow path 9 is opened at a small opening (the state of FIG. 6).

By the way, as shown in FIG.
When the valve body 2 is positioned at the small opening position, the valve body 11 is in a state of being floated by the magnet 14 of the driving member 12, that is, the upper and lower ends of the valve body 11 are in contact with nothing. In this state, for example, as shown in the figure, the height of the magnet 14 and the height of the magnetic body 15 of the valve body 11 are substantially the same. On the other hand, in order to stably hold the valve body 11 at the open position, as shown in FIG. 5, the valve body 11 is provided on the partition 2 opposite to the valve seat 3a.
A stopper 2b is provided for contacting the upper end of the valve body 11 when the valve body 11 is moved away from the valve body 11 and the open position of the drive member 12 is adjusted even if the valve body 11 contacts the stopper 2b. The valve body 11 is set at a position for urging the valve body 11 in a direction away from the valve seat 3a by a predetermined distance L1. That is, the open position of the driving member 12 is
The height of the magnet 14 of the driving member 12 is set to be higher than the height of the magnetic body 15 of the valve body 11 in a state of contact with the magnet by the predetermined distance L1. In this state, the valve element 11 is pressed against the stopper 2b, so that the valve element 11 can be stably held at the open position with a large opening compared to the case of FIG. Similarly, as shown in FIG. 4, in order to stably hold the valve body 11 in the closed position, the closed position of the driving member 12 is set to the valve seat 3a.
The height of the magnet 14 of the drive member 12 is set to be lower by a predetermined distance L2 than the height of the magnetic body 15 of the valve body 11 in a state of being seated.

In the above configuration, when the driving member 12 is located at the closed position, the valve portion 11a of the valve body 11 is seated on the valve seat 3a to close the flow passage 9. When the drive member 12 is moved to the open position from this state, the valve body 11 rises to a position where the upper end thereof comes into contact with the stopper 2b,
The flow path 9 is opened at a large opening. As a result, a large flow rate of the filling liquid flows through the flow path 9. At this time, since the valve body 11 is pressed against the stopper 2 b, even if a large flow rate of the filling liquid flows through the flow path 9. Stable filling can be performed without being displaced by the flow velocity and reducing the opening degree or sitting on the valve seat 3a. At this time,
Since the gap between the outer peripheral surface of the cylindrical portion 11b of the valve body 11 and the inner peripheral surface of the pipe body 3 can be narrowed, even if a large amount of the filling liquid flows through the flow path 9, Radial runout can be reduced, and also in this regard, a change in flow rate can be suppressed, and highly accurate filling can be performed. Most of the filling liquid is supplied to the internal passage 11 d formed inside the valve body 11,
1e and the outer periphery of the neck 11c can be circulated, so that the flow path area does not become insufficient.

When the filling liquid is filled into the container (not shown) at a large flow rate as described above, and when it is detected that the container is filled with a predetermined amount of filling liquid by, for example, a weighing scale, the driving member 12 is turned on. It is positioned at the small opening position. As a result, the valve portion 11a of the valve body 11 is positioned adjacent to the valve seat 3a, so that the filling liquid is filled into the container at a small flow rate. In this state, the valve element 11 is floated by the magnet 14 of the driving member 12, but at this time, the filling liquid flowing through the flow path 9 has a small flow rate, and is displaced by the flow velocity. Stable filling can be performed without reducing the opening degree or sitting on the valve seat 3a. In addition, since the gap between the outer peripheral surface of the cylindrical portion 11b of the valve body 11 and the inner peripheral surface of the pipe body 3 is narrowed as described above, the drive member 12 is closed from this small opening degree. , The valve portion 11a of the valve body 11 is securely
a.

FIG. 7 shows a second embodiment of the present invention. In this embodiment, the housing itself is constituted by a tube 103. The upper portion of the pipe 103 is fixed to a structure of a filling machine (not shown), and an upper pipe (not shown) is connected to an upper end thereof, and a lower pipe 106 is connected to a lower end thereof. And The above tube 1
A valve seat 103 a surrounding the flow path 109 is formed at the lower end of the valve seat 103.
A valve body 111 which sits on a and closes the flow path 109 is slidably provided. A driving member 112 for displacing the valve body 111 by being magnetically coupled to the valve body 111 is provided outside the tube body 103.
Is linked via a bracket 151 and a piston rod 125 to a drive device (not shown) having a configuration equivalent to that of the first embodiment. Therefore, in the present embodiment, the bracket 151 and the piston rod 125 constitute a connecting means for connecting the driving device and the driving member 112.

Two magnets 114 surrounding the tube 103 are attached to the upper and lower positions of the inner peripheral portion of the driving member 112, and two magnets 114 are attached to the cylindrical portion 111b of the valve body 111 in accordance with the distance between the magnets 114. The magnetic body 115 made of two iron pieces or the like is embedded, and the tube 103 is made of a non-magnetic material. Further, the pipe body 103 has a stopper portion 1 which comes into contact with an upper end portion of the valve body 111 when the valve body 111 is moved in a direction away from the valve seat 103a.
52 as well as the first embodiment, even if the valve body 111 is in contact with the stopper 152 when the drive member 112 is in the open position, the valve body 111 is further moved to the valve seat 1.
It is set at a position where it is urged in a direction away from the head 03a by a predetermined distance. Other configurations are the same as those of the first embodiment, and it is apparent that the present embodiment having such a configuration can provide the same operation and effects as those of the first embodiment.

FIG. 8 shows a third embodiment of the present invention. In this embodiment, a flow path 209 is formed outside a tubular body 203 and a driving member 212 is provided inside. That is, in the present embodiment, a tube 203 having a closed lower end is disposed and fixed inside the housing 201, and a passage 209 is formed between the tube 203 and the housing 201. The flow path 209 communicates with an upper pipe 208 connected to an upper part of the housing 201 and also communicates with a lower pipe 206 connected to a lower end of the housing 201. In the lower part of the housing 201, the flow path 20 is provided.
9, a valve seat 201a surrounding the flow path 2 is formed.
A valve body 211 which is seated on the valve seat 201a and closes the flow path 209 is provided in the movable body 09 in a vertical direction.
The lower end of the valve body 211 is a valve portion 211a to be seated on the valve seat 201a, and a portion above the valve portion is formed in a cylindrical shape to form a cylindrical portion 211b. The tube 203 is loosely fitted therein. That is, between the inner peripheral surface of the cylindrical portion 211b and the outer peripheral surface of the tube 203, an internal passage 211d forming a part of the flow path 209 is formed.
The internal passage 211d has a plurality of through holes 21.
1e, the valve body 21 at a position before the valve portion 211a.
1 communicates with the outer periphery. On the other hand, a gap for forming the flow path 209 is also provided between the outer peripheral surface of the cylindrical portion 211b and the inner peripheral surface of the housing 201. At least 3 along the direction
The rib 211f of the book is formed so as to protrude so that the valve body 211 does not fluctuate in the radial direction.

Further, a drive member 212 for displacing the valve body 211 by being magnetically coupled to the valve body 211 is provided inside the tube body 203.
Reference numeral 2 is linked via a piston rod 225 to a drive device (not shown) having a configuration equivalent to that of the first embodiment. Therefore, in this embodiment, the piston rod 22
5 constitutes a connecting means for connecting the driving device and the driving member 212. Two ring-shaped magnets 214 are attached to the upper and lower positions of the driving member 212, and a magnetic body 215 made of two iron pieces or the like is fitted to the cylindrical portion 211b of the valve body 211 in accordance with the interval between the magnets 214. The tube 203 is embedded and is made of a non-magnetic material. The valve body 21 is provided above the pipe body 203.
When the first member 1 is moved in a direction away from the valve seat 201a, a stopper portion 252 is formed which comes into contact with the upper end of the valve body 211, and the driving member 21 is formed in the same manner as in the first embodiment.
2 is set to a position where the valve body 211 is further urged in a direction away from the valve seat 201a by a predetermined distance even if the valve body 211 comes into contact with the stopper portion 252. Other configurations are the same as those of the first embodiment, and it is apparent that the present embodiment having such a configuration can provide the same operation and effects as those of the first embodiment.

An electromagnet can be used as the magnet, and the magnet may be provided on the valve body side. Further, the drive device 13 is not limited to the one described in the above embodiment. For example, the drive members 12, 112, and 212 are respectively moved to the closed position, the open position, and the small opening position by using a cam mechanism. It may be.

[0021]

As described above, according to the present invention, when the driving member is located at the open position, the valve body can be pressed against the stopper portion to be in the open state, so that a large flow rate can be filled. Even if the liquid is circulated, the effect of preventing the valve opening from fluctuating or being seated on the valve seat can be prevented.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a first embodiment of the present invention.

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is a sectional view taken along the line III-III in FIG. 1;

FIG. 4 is an enlarged sectional view of a main part of FIG. 1;

FIG. 5 is a sectional view showing a state in which the driving member 2 has been moved to an open position.

FIG. 6 is a sectional view showing a state where the driving member 2 is located at a small opening position.

FIG. 7 is a sectional view showing a second embodiment of the present invention.

FIG. 8 is a sectional view showing a third embodiment of the present invention.

[Explanation of symbols]

1, 201 ... housing 2b, 152, 2
52 ... Stopper part 3, 103, 203 ... Tube body 3a, 103a,
201a: Valve seat 9, 109, 209: Flow path 11, 111, 2
11 ... valve element 11a, 211a ... valve part 11b, 211b
... cylindrical part 11c ... neck part 11d, 211d
... internal passages 12, 112, 212 ... driving member 13 ... driving device

Claims (6)

[Claims] 1. A flow passage formed in a housing, a valve seat surrounding the flow passage, and a valve body movably provided in the flow passage and seated on the valve seat to close the flow passage. A drive member movably provided outside the flow path, magnetically coupled to the valve body to displace the valve body, and a drive member connected to the drive member via connection means; and A magnet valve provided with a drive device for moving the valve body to a closed position where the valve body is seated on a valve seat and an open position for separating the valve body from the valve seat, wherein the valve body moves in a direction away from the valve seat. A stopper portion is provided for contacting the valve body when the valve body is opened, and the open position of the driving member is further set in a direction to separate the valve body from the valve seat even if the valve body contacts the stopper portion. A magnet valve characterized in that it is located at a biased position. 2. The apparatus according to claim 1, wherein a tube is provided in the housing, the flow path is formed in the tube, and the driving member is movably provided outside the tube. The magnetic valve according to the above. 3. The housing according to claim 1, wherein the housing is formed of a tube, the flow path is formed in the tube, and the driving member is movably provided outside the tube. The described magnet valve. 4. A tube is provided in the housing, the flow path is formed between the tube and the housing, and the driving member is movably provided inside the tube. The magnet valve according to claim 1, wherein 5. The magnet according to claim 1, wherein the drive member is positioned at a small opening position provided between the closed position and the open position. valve. 6. The valve body has therein an internal passage which forms a part of the flow path, and the internal passage is provided at a position before a valve portion of the valve body seated on the valve seat. The magnet valve according to any one of claims 1 to 5, wherein the magnet valve communicates with an outer periphery of the valve body.