CN111895165A

CN111895165A - Valve device

Info

Publication number: CN111895165A
Application number: CN201910369745.8A
Authority: CN
Inventors: 石川胜浩; 大泽直浩
Original assignee: Deli Ding Industrial Co ltd
Current assignee: Deli Ding Industrial Co ltd; Trinity Industrial Corp
Priority date: 2019-05-05
Filing date: 2019-05-05
Publication date: 2020-11-06

Abstract

The invention provides a valve device which is small, can be operated by pilot gas with relatively low pressure and has excellent durability. A valve device (11) of the present invention comprises: a pilot port (53) to which a pilot gas for driving the piston (43) is supplied; and a biasing mechanism (54) for biasing the piston (43) in the opposite direction, and opening and closing the valve is controlled by supplying and discharging the pilot gas. A first magnetic member (56) is provided on the valve rod (41) side, and a second magnetic member (57) is provided on the housing (21) side. A magnetic attraction force that drives the piston section (43) in the first direction (A1) and increases as the piston section approaches each other acts between the magnetic members (56, 57). The magnetic members (56, 57) are disposed so that they face each other with a gap therebetween even when they are closest to each other.

Description

Valve device

Technical Field

The present invention relates to a valve device, and more particularly to a valve device suitable for use as a color change valve (color change valve) for selectively selecting and supplying paint of each color supplied from a paint supply source to a coating machine or the like.

Background

In recent years, the demand for vehicle body colors has been diversified by consumers, and it has become necessary to perform various kinds of painting work for the same vehicle type. In particular, in recent automobile body painting lines, automobile bodies of different colors are transported in a mixed state, and therefore color-changing painting is required to be performed in accordance with the automobile bodies.

For example, the color changer 101 shown in fig. 12 is used for color changing painting. A conventional and usual color changer 101 has a structure in which a plurality of color changing valves 104, a cleaning liquid valve 105, a cleaning gas valve 106, and the like are attached to a manifold block (manual block)103 in which a paint flow path 102 is formed. The plurality of color changing valves 104 are individually connected to paint supply sources P1 to P4 for the respective colors. The cleaning liquid valve 105 is connected to a cleaning liquid supply source 107, and the cleaning gas valve 106 is connected to a compressed air supply source 108. By using the color changer 101, it is possible to select an arbitrary color coating material from among the supplied coating materials of a plurality of colors by the color changer 101, supply the selected color coating material to the coater 109, and perform painting.

Fig. 13 shows an example of a conventional valve device used as the color changing valve 104 in the color changing device 101. The color change valve 104 is a pilot-type double-port valve having a piston cylinder as a drive mechanism, and is configured by a valve drive portion 112 located on the upper side in the drawing and a valve body portion 113 located on the lower side in the drawing.

The piston housing 121 constituting the valve driving portion 112 has a piston housing space 122 therein, and a rod insertion hole 123 communicating with the piston housing space 122 at a lower portion. A valve housing 131 is attached to a lower end surface of the piston housing 121. An input port 132 is formed in a side surface of the valve housing 131, an output port 133 is formed in a lower surface, and these

ports

132 and 133 communicate with a flow passage 134 provided in the valve housing 131. A valve seat 135 is formed inside the opening of the output port 133. Further, a support assembly (support assembly)138 including

gaskets

136, 137 and the like is disposed in the valve housing 131.

The color changing valve 104 includes a valve rod 141 as a movable body, and the valve rod 141 includes a rod portion 142, a piston portion 143, and a valve portion 144. The piston portion 143 is fixed to the base end side of the rod portion 142 and is slidably accommodated in the piston accommodating space 122. The tip end side of the rod portion 142 protrudes outside the piston housing space 122 through the rod insertion hole 123 and the support assembly 138, and reaches the vicinity of the valve seat 135 in the valve housing 131. The valve portion 144 is formed integrally with the distal end of the rod portion 142 and can be brought into contact with and separated from the valve seat 135.

The piston housing space 122 in the piston housing 121 is divided into a first chamber 151 and a second chamber 152 by the piston portion 143. A pilot port 153 to which pilot gas is supplied for driving the piston portion 143 in the upward direction is formed in the piston housing 121 on the side of the first chamber 151. A biasing mechanism 154 that biases the piston portion 143 downward at all times is housed in the second chamber 151 of the piston housing 121. In the color change valve 104 configured as described above, the valve stem 141 is driven in the vertical direction by supply and discharge of the pilot gas, and the valve portion 144 is brought into contact with and separated from the valve seat 135, thereby controlling opening and closing of the valve.

As such a valve device, for example, a device shown in patent document 1 has been proposed in the related art.

Documents of the prior art

Patent document

Patent document 1: japanese patent No. 5511339

Patent document 2: japanese patent laid-open publication No. 2017-2939

However, the conventional valve device is mounted on a drive portion such as an arm portion of a coating machine, and in this connection, it is required to be as small as possible. However, if the valve device is to be downsized, the piston diameter must be reduced, which results in a reduction in the pressure receiving area of the piston portion. Therefore, in order to drive the piston portion with the same force as before, the pressure of the pilot gas needs to be increased (for example, 0.4MPa → 0.8MPa), and the pressure of the compressor for supplying the gas has to be increased.

Under such circumstances, a valve device has been proposed in the related art which uses the magnetic force of a magnet to assist the piston driving force generated by the pilot gas (see, for example, patent document 2). However, in the case of this conventional device, the structure becomes complicated, and in addition, the magnet housed in the case directly abuts against the partition wall, and therefore, there is a problem that not only is noise generated, but also there is a fear that the magnet made of a material less resistant to impact or the like is broken, and the durability is low.

Disclosure of Invention

The present invention has been made in view of the above problems, and an object thereof is to provide a valve device which is compact, can be operated by a relatively low-pressure pilot gas, and has excellent durability.

In order to solve the above problem, the gist of the invention described in claim 1 is a valve device including: a housing having a piston accommodating space; a valve rod having a piston portion provided at a position inside the piston housing space and a valve portion formed at a distal end side outside the piston housing space; a pilot port provided on the first chamber side of a first chamber and a second chamber defined by the piston portion in the housing, the pilot port being supplied with a pilot gas for driving the piston portion in a first direction along an axis of the valve stem; and a biasing mechanism provided on the second chamber side in the housing and biasing the piston portion in a second direction opposite to the first direction, the valve device controlling opening and closing of the valve by bringing the valve portion into contact with and away from a valve seat by supply and discharge of the pilot gas, the valve device including: a first magnetic member provided on the valve stem side; and a second magnetic member provided on the housing side in a state of facing the first magnetic member, at least one of the first magnetic member and the second magnetic member being a permanent magnet, a magnetic attractive force that drives the piston portion in the first direction and increases as the piston portion approaches each other being exerted between the first magnetic member and the second magnetic member, and an arrangement relationship in which the first magnetic member and the second magnetic member face each other with a gap interposed therebetween even when the first magnetic member and the second magnetic member approach each other most is set.

Therefore, according to the invention described in claim 1, a magnetic attraction force that drives the piston portion in the first direction and increases as the piston portion approaches each other acts between the two magnetic members. When the pilot gas is supplied, the valve rod is driven in the first direction by applying a magnetic attraction force in addition to the pressure of the pilot gas. Therefore, even if the pressure receiving area of the piston portion is reduced, the opening and closing of the valve can be controlled using the pilot gas of relatively low pressure. Further, since the two magnetic members are disposed in such a manner that they face each other with a gap therebetween even when they are closest to each other, the magnetic members are prevented from abutting each other when the valve rod is driven, and the magnetic members are also prevented from abutting against the inner wall of the housing. This makes it difficult to generate noise and damage due to contact of the magnetic member, and durability is improved.

The gist of the invention described in claim 2 is that, in addition to claim 1, the magnetic attractive force acting on the piston portion when the pilot gas is not supplied is smaller than the biasing force of the biasing mechanism, and a sum of the magnetic attractive force acting on the piston portion when the pilot gas is supplied and the pressing force generated by the pilot gas is larger than the biasing force of the biasing mechanism.

The gist of the invention described in claim 3 is that, in addition to claim 1 or 2, both the first magnetic member and the second magnetic member are permanent magnets, and a proximity fixing member that holds and fixes the first permanent magnet as the first magnetic member in a state in which the first permanent magnet is close to the second permanent magnet as the second magnetic member is provided on the valve stem side.

Therefore, according to the invention described in claim 3, since the first permanent magnet can be brought close to the second permanent magnet, a magnetic attractive force can be efficiently applied between the two permanent magnets.

The gist of the invention described in claim 4 is that, in addition to claim 1 or 2, both the first magnetic member and the second magnetic member are permanent magnets, and a proximity fixing member that holds and fixes the second permanent magnet as the second magnetic member in a state in which the second permanent magnet is in proximity to the first permanent magnet as the first magnetic member is provided on the housing side.

Therefore, according to the invention described in claim 4, since the second permanent magnet can be brought close to the first permanent magnet, a magnetic attractive force can be efficiently applied between the two permanent magnets.

The gist of the invention described in claim 5 is that, in addition to claim 3 or 4, a stopper step portion for avoiding collision between the first permanent magnet and the second permanent magnet by abutting against a portion of the piston portion where the first permanent magnet is not present is provided on the housing side.

Therefore, according to the invention of claim 5, since the corresponding portion and the stopper step portion are preferentially brought into contact with each other, contact between the permanent magnets and the like is avoided, and as a result, noise generation and breakage are less likely to occur.

The gist of the invention described in claim 6 is that, in addition to claim 3 or 4, a stopper member for avoiding collision between the first permanent magnet and the second permanent magnet by abutting against a portion of the housing where the second permanent magnet is not present is provided on the valve stem side.

Therefore, according to the invention of claim 6, since the corresponding portion and the stopper member are preferentially brought into contact with each other, contact between the two permanent magnets and the like is avoided, and as a result, noise generation and breakage are less likely to occur.

Effects of the invention

As described above in detail, according to the inventions described in claims 1 to 6, it is possible to provide a valve device which is small in size, can be operated by a relatively low-pressure pilot gas, and is excellent in durability.

Drawings

Fig. 1 (a) and (b) are schematic longitudinal sectional views showing a valve device according to a first embodiment of the present invention.

Fig. 2 is a schematic diagram for explaining a state in use of the valve device of the first embodiment.

Fig. 3 (a) and (b) are schematic longitudinal sectional views showing a valve device according to a second embodiment of the present invention.

Fig. 4 (a) and (b) are schematic longitudinal sectional views showing a valve device according to a third embodiment of the present invention.

Fig. 5 (a) and (b) are schematic longitudinal sectional views showing a valve device according to a fourth embodiment of the present invention.

Fig. 6 (a) and (b) are schematic longitudinal sectional views showing a valve device according to a fifth embodiment of the present invention.

Fig. 7 is a schematic longitudinal sectional view showing a valve device according to a sixth embodiment of the present invention.

Fig. 8 is a schematic diagram for explaining an example of use of the valve device according to the sixth embodiment.

Fig. 9 (a) and (b) are schematic longitudinal sectional views showing a valve device according to another embodiment of the present invention.

Fig. 10 (a) and (b) are schematic longitudinal sectional views showing a valve device according to another embodiment of the present invention.

Fig. 11 (a) and (b) are schematic longitudinal sectional views showing a valve device according to another embodiment of the present invention.

Fig. 12 is a schematic diagram for explaining the configuration of a color changer using a valve device.

Fig. 13 is a schematic longitudinal sectional view showing a valve device of a conventional example.

Description of the reference numerals

11. 11A, 11B, 11C, 11D, 11E, 11F, 11G, 11H … as color changing valves of valve devices

21 … (piston) casing

22 … piston accommodation space

35 … valve seat

41 … valve stem

43 … piston part

51 … first chamber

52 … second chamber

53 … Pilot Port

56. 66 … first permanent magnet as first magnetic part

57. 67 … second permanent magnet as second magnetic part

70 … cover member made of magnetic material as second magnetic member

55. 59 … as a sleeve for access to a fixed part

58 … stopper step

68 … stop member

A1 first Direction

A2 … second direction

Detailed Description

[ first embodiment ]

The color change valve 11 according to an embodiment of the valve device of the present invention will be specifically described below with reference to fig. 1 to 2. Fig. 1 (a) and (b) are schematic vertical sectional views showing the color change valve 11, and fig. 2 is a schematic diagram for explaining a state in which the color change valve 11 is used as a part of the color change device CV 1.

As shown in fig. 1, the color change valve 11 of the present embodiment is a pilot-type double port valve having a piston cylinder as a drive mechanism, and is composed of a valve drive portion 12 located on the upper side in the drawing and a valve body portion 13 located on the lower side in the drawing.

The piston housing 21 constituting the valve driving portion 12 has a piston housing space 22 therein. The piston housing 21 has a rod insertion hole 23 communicating with the piston housing space 22 at a lower center portion. A valve housing 31 is attached to a lower end surface of the piston housing 21. An input port 32 is formed in a side surface of the valve housing 31, and an output port 33 is formed in a central portion of a lower surface. Further, a flow passage 34 through which the paint flows is formed in the valve housing 31, and the input port 32 and the output port 33 communicate with the flow passage 34. A valve seat 35 having a tapered cross section is formed inside the opening of the output port 33. Further, a cylindrical support assembly 38 including

seal members

36, 37 and the like is disposed inside the valve housing 31 in a region (communication space) connecting the flow passage 34 and the rod insertion hole 23 on the piston housing 21 side. Here, the seal member 36 prevents the pilot gas from leaking from the piston housing space 22 side to the flow path 34 side through the communication space. The seal member 37 prevents the paint, the cleaning agent, and the like introduced to the flow path 34 from leaking to the piston housing space 22 side through the communication space.

The color change valve 11 includes a valve stem 41 as a movable body, and the valve stem 41 includes a rod portion 42, a piston portion 43, and a valve portion 44. The valve rod 41 is slidably inserted into the rod insertion hole 23. In the rod portion 42 of the present embodiment, the lower half portion is a large diameter portion having a relatively large diameter, and the upper half portion is a small diameter portion having a relatively small diameter. The disc-shaped piston portion 43 is fixed to a small diameter portion of the rod portion 42, that is, to a position inside the piston housing space 22. The piston portion 43 is accommodated in the piston accommodating space 22 and can slide in the vertical direction in this state. A packing accommodating recess is provided on the outer peripheral surface of the piston portion 43, and an annular seal packing 45 is accommodated therein.

The lower end side (tip end side) of the rod portion 42 protrudes to the outside region of the piston housing space 22 through the rod insertion hole 23. The lower end side (tip end side) of the rod portion 42 further passes through the center hole of the support assembly 38 and is exposed to the flow passage 34 in the valve housing 31.

The valve portion 44 having a tapered surface is integrally formed at the distal end of the rod portion 42 and can be brought into contact with and separated from the valve seat 35 in accordance with the vertical movement of the valve rod 41. Incidentally, fig. 1 (a) shows a state in which the valve portion 44 abuts against the valve seat 35, and fig. 1 (b) shows a state in which the valve portion 44 is separated from the valve seat 35.

The piston housing space 22 in the piston housing 21 is divided by the piston portion 43 into a first chamber 51 on the lower side and a second chamber 52 on the upper side. A pilot port 53 to which pilot gas is supplied for driving the piston portion 43 in the upward direction is formed in the piston housing 21 on the first chamber 51 side. The pilot port 53 opens on the side surface of the piston housing 21, and thereby communicates the first chamber 51 with the atmospheric pressure environment.

The second chamber 51 in the piston housing 21 communicates with the atmospheric pressure environment via a rod relief hole 25 provided in the center of the top 24. The upper end of the small diameter portion of the rod portion 42 is inserted into the rod release hole 25 in a non-contact state at all times. In the second chamber 51, a coil spring 54 as a biasing means is accommodated in a compressed state. One end of the coil spring 54 abuts on the upper end surface of the piston portion 43, and the other end abuts on the inner wall surface of the top portion 24 in the piston housing 21. As a result, the coil spring 54 is in a state in which an urging force for urging the piston portion 43 in the downward direction at all times is exerted.

Next, a mechanism for assisting the piston driving force generated by the pilot gas using magnetic force will be described. The color change valve 11 of the present embodiment includes a first permanent magnet 56 as a first magnetic member and a second permanent magnet 57 as a second magnetic member in the valve driving unit 12.

The second permanent magnet 57 is a ring-shaped magnet and is attached to an attachment recess formed on the inner end side of the lever release hole 25 in the top portion 24. On the other hand, the first permanent magnet 56 is also a magnet having a ring shape in the same manner, and has a size capable of being fitted into the small diameter portion of the rod portion 42. The first permanent magnet 56 is formed slightly smaller than the inner diameter of the coil spring 54 so as to be disposed in the inner region of the coil spring 54 without contacting the coil spring 54. The second permanent magnet 57 is also formed to have a size substantially equal to that of the first permanent magnet 56. As the first permanent magnet 56 and the second permanent magnet 57, any conventionally known permanent magnet can be used, but in the present embodiment, a rubidium magnet having a strong magnetic force is used. In addition, samarium cobalt magnets, ferrite magnets, alnico magnets, or the like may be used.

A cylindrical sleeve 55 (close to the fixing member) is attached to a position on the base end side of the piston portion 43 in the small diameter portion of the rod portion 42. The sleeve 55 is made of a nonmagnetic material (e.g., synthetic resin or a nonmagnetic metal such as aluminum) having a predetermined length, and has one end in contact with the center of the upper end surface of the piston portion 43 and the other end to which the first permanent magnet 56 is fixed by bonding or the like. As a result, for example, the first permanent magnet 56 can be held and fixed in a state of being disposed in close proximity to and facing the second permanent magnet 57, as compared with a case where the first permanent magnet 56 is directly fixed to the upper end surface of the piston portion 43.

Further, a magnetic force for driving the piston portion 43 in the upward direction a1 (first direction) of fig. 1, that is, a magnetic attraction force acts between the first permanent magnet 56 and the second permanent magnet 57. Therefore, the first permanent magnet 56 and the second permanent magnet 57 are arranged to face each other with different magnetic poles facing each other. In this case, the magnetic attraction increases as the first permanent magnet 56 and the second permanent magnet 57 approach each other, and becomes maximum in the state of fig. 1 (b) where the two are closest to each other.

Further, a stopper step portion 58 for avoiding collision of the first permanent magnet 56 and the second permanent magnet 57 with each other is provided on an inner wall surface of a side wall portion of the second chamber 51 in the piston housing 21. The stopper step portion 58 is in contact with a portion of the piston portion 43 where the first permanent magnet 56 is not present, specifically, an outer peripheral portion of the piston portion 43 on the upper end surface side. As a result of this contact, the upward movement of the piston portion 43 is restricted (see fig. 1 (b)). As shown in fig. 1 (b), when the first permanent magnet 56 and the second permanent magnet 57 are closest to each other, the first permanent magnet 56 is stopped with a minute gap (for example, a gap of about 1 to 5 mm) formed therebetween, and the arrangement relationship is set between the first permanent magnet 56 and the second permanent magnet. Specifically, the above-described arrangement relationship can be set by adjusting the length of the sleeve 55 to an appropriate value.

Here, when the pilot gas is not supplied as shown in fig. 1 (a), the first chamber 51 and the second chamber 52 are both in the atmospheric pressure environment, and the pressing forces based on the atmospheric pressure acting in the first direction a1 and the second direction a2 via the piston portion 43 cancel each other out. At this time, the urging force of the coil spring 54 that urges the piston portion 43 in the second direction a2 acts on the piston portion 43, and a magnetic attraction force that urges the piston portion 43 in the first direction a1 acts on the piston portion 43. However, since the first permanent magnet 56 and the second permanent magnet 57 are separated from each other to the maximum extent, the magnetic attraction force at this time becomes the minimum value. At this time, since the magnetic attractive force is set to be smaller than the biasing force of the coil spring 54, the piston portion 43 moves in the second direction a 2. As a result, the valve rod 41 moves downward to bring the valve portion 44 into contact with the valve seat 35, and the flow path 34 is closed. That is, in the color change valve 11 of the present embodiment, even in a state in which the pilot gas is blocked, the valve is reliably closed by the biasing force of the coil spring 54.

In addition, when the pilot gas shown in fig. 1 (b) is supplied, the inside of the second chamber 52 is maintained at the atmospheric pressure, and the pressurized pilot gas is introduced into the first chamber 51 from the pilot port 53. As a result, the pressure of the pilot gas acts on the lower surface side of the piston portion 43, and a force that attempts to press the piston portion 43 in the first direction a1 acts. The sum of the pressing force generated by the pilot gas and the magnetic attraction force is set to be larger than the biasing force of the coil spring 54. Thus, by simultaneously applying the pressing force generated by the pilot gas and the magnetic attraction force, the piston portion 43 moves in the first direction a1 against the biasing force of the coil spring 54, and comes into contact with and stops at the stopper step portion 58. As a result, the valve rod 41 moves upward, the valve portion 44 separates from the valve seat 35, and the flow path 34 is opened.

Next, the operation when the color changing valve 11 of the present embodiment configured as described above is used as a part of the color changing device CV1 will be described. As shown in fig. 2, for example, the color change valve is used in a state where a plurality of color change valves 11 according to the present embodiment are connected to a manifold block M1. A main flow path R1 as a paint flow path is formed in the manifold block M1, and sub-flow paths R2 branched therefrom are formed at a plurality of locations. The main flow path R1 is connected to an unillustrated coating machine. Each color change valve 11 is attached in a state where the valve housing 31 side is in contact with the manifold block M1 so that the opening of each sub-flow passage R2 communicates with each output port 33. The input port 32 of each color changing valve 11 is connected to each paint supply source (not shown). The pilot port 53 of each color changing valve 11 is connected to a gas compressor (not shown) for supplying a pilot gas through a fluid control device such as an electromagnetic valve (not shown). In the case of the present embodiment, a relatively low-pressure gas of, for example, about 0.4Mpa is supplied.

In the state before the pilot gas is not supplied to each color change valve 11, the flow path 34 of each color change valve 11 is closed, and thus the paint is not supplied to the sub flow path R2 and the main flow path R1. Here, when the pilot gas is supplied to a specific color change valve 11, the stem 41 of the color change valve 11 is driven from the position (a) of fig. 1 to the position (b) of fig. 1. As a result, the valve portion 44 is in an open state separated from the valve seat 35, and the input port 32 and the output port 33 are in a state of communication via the flow path 34. Thereby, a predetermined paint flows into the manifold block M1 from the color change valve 11 side, and the paint is supplied to the coating machine side. When the supply of the pilot gas to the color change valve 11 is stopped, the stem 41 of the color change valve 11 is returned from the position (b) of fig. 1 to the position (a) of fig. 1.

As a result, the valve portion 44 is in a closed state in which it abuts against the valve seat 35, and the input port 32 and the output port 33 are in a blocked state. Thereby, the predetermined paint does not flow into the manifold block M1 from the color change valve 11 side, and the supply of the paint to the coating machine side is stopped.

Therefore, according to the present embodiment, the following effects can be obtained.

(1) According to the color change valve 11 of the present embodiment, a magnetic attraction force that increases as the piston portion 43 is driven in the first direction a1 and approaches each other acts between the first permanent magnet 56 and the second permanent magnet 57. Thus, when the pilot gas is supplied, the valve rod 41 is driven in the first direction a1 by the magnetic attraction acting in addition to the pressure of the pilot gas. Therefore, even if the pressure receiving area of the piston portion 43 is small, the opening and closing of the valve can be controlled using the relatively low-pressure pilot gas. Further, the first permanent magnet 56 and the second permanent magnet 57 are disposed in such a manner that they face each other with a gap therebetween even when they are closest to each other. Therefore, when the valve rod 41 is driven, the first permanent magnet 56 and the second permanent magnet 57 are prevented from abutting against each other, and the first permanent magnet 56 and the second permanent magnet 57 are also prevented from abutting against the inner wall of the piston housing 21. This makes it difficult to generate noise and breakage due to contact of these members, and durability is improved. As described above, according to the present embodiment, the color change valve 11 can be provided which is small and lightweight, can be operated by a relatively low-pressure pilot gas, and has excellent durability.

(2) In the case of the color change valve 11, the magnetic attraction force acting on the piston portion 43 when the pilot gas is not supplied is set to be smaller than the biasing force of the coil spring 54. Accordingly, the valve rod 41 can be moved to the position where the valve portion 44 abuts against the valve seat 35 by the biasing force of the coil spring 54, and the valve can be held in a reliably closed state. The sum of the magnetic attraction acting on the piston portion 43 when the pilot gas is supplied and the pressing force generated by the pilot gas is set to be larger than the biasing force of the coil spring 54. Accordingly, the valve rod 41 can be moved to a position where the valve portion 44 is separated from the valve seat 35 by a resultant force of the magnetic attraction and the pressing force generated by the pilot gas, and the valve can be held in a state where the valve is reliably opened. In addition, in the present embodiment, since the valve is of the normally closed type in which the valve is closed by the biasing force of the coil spring 54 when the pilot gas is not supplied, most of the plurality of color change valves 11 can be closed, and the supply amount of the pilot gas when the color changing device CV1 is operated can be reduced.

(3) In the case of this color change valve 11, since the first permanent magnet 56 is used as the first magnetic member and the second permanent magnet 57 is used as the second magnetic member, a larger magnetic attraction force can be applied than in the case where either one of the first and second magnetic members is not a magnet. Further, the sleeve 55 is provided on the valve rod 41 side so as to hold and fix the first permanent magnet 56 in a state close to the second permanent magnet 57, whereby a large magnetic attraction force can be efficiently applied therebetween.

(4) In the case of this color change valve 11, a stopper step portion 58 is provided on the piston housing 21 side, and abuts against an outer peripheral portion of the upper end surface of the piston portion 43 where the first permanent magnet 56 is not present. Thus, when the valve rod 41 moves in the first direction a1, the corresponding portion and the stopper step portion 58 preferentially abut against each other, thereby avoiding collision or the like of the first permanent magnet 56 and the second permanent magnet 56 with each other. As a result, noise generation and breakage are less likely to occur.

(5) In the color change valve 11, the first permanent magnet 56 is used as the first magnetic member, the second permanent magnet 57 is used as the second magnetic member, and a non-magnetic member is used for other valve components (the piston housing 21, the valve housing 31, the rod portion 42, the piston portion 43, the support assembly 38, and the like). Therefore, a magnetic force does not act between the valve component and the valve component, and a magnetic attraction force can act only between the first permanent magnet 56 and the second permanent magnet 57.

[ second embodiment ]

The color change valve 11A according to the second embodiment, which embodies the valve device of the present invention, will be specifically described below with reference to fig. 3. Fig. 3 (a) and (b) are schematic longitudinal sectional views showing the color change valve 11A. Note that, in the present embodiment, the description will be given mainly on portions different from those in the first embodiment, and only the same reference numerals are given to the same portions, and the detailed description thereof is omitted.

As shown in fig. 3 (a) and (b), the color change valve 11A includes a first permanent magnet 66 as a first magnetic member and a second permanent magnet 67 as a second magnetic member in the valve driving unit 12. The first permanent magnet 66 and the second permanent magnet 67 are both annular magnets, but the dimensions and the installation locations are different from those of the first embodiment. The first permanent magnet 66 has substantially the same outer diameter as the piston portion 43, and is attached to an attachment recess formed in the outer peripheral portion of the upper end surface of the piston portion 43. The second permanent magnet 67 also has substantially the same outer diameter as the first permanent magnet 66. A mounting recess is formed in a stepped portion of the piston housing 21 located on the inner wall surface of the side portion of the second chamber 52, and the second permanent magnet 67 is mounted to the mounting recess. Therefore, the first permanent magnet 66 and the second permanent magnet 67 are arranged to face each other with different magnetic poles facing each other.

In the present embodiment, a stopper 68 made of a cylindrical nonmagnetic material is fixed to a position on the base end side of the piston portion 43 in the small diameter portion of the cylindrical rod portion 42. The upper end side of the stopper member 68 abuts against a portion of the piston housing 21 where the first permanent magnet 66 is not present, specifically, an inner wall surface of the top portion 24. As a result of this contact, the upward movement of the piston portion 43 is restricted (see fig. 3 (b)). As shown in fig. 3 (b), when the first permanent magnet 66 and the second permanent magnet 67 are closest to each other, the first permanent magnet 66 is stopped with a minute gap (for example, a gap of about 1 to 5 mm) formed therebetween, and the arrangement relationship is set between the first permanent magnet 66 and the second permanent magnet.

Even in the color change valve 11A configured as described above, the valve opening and closing control can be performed by driving the valve rod 41 in the vertical direction by supplying and discharging the pilot gas and bringing the valve portion 44 into contact with and away from the valve seat 35. The color change valve 11A is small in size, but can be operated by a relatively low-pressure pilot gas and has excellent durability.

[ third embodiment ]

Hereinafter, a color change valve 11B according to a third embodiment of the valve device of the present invention will be described in detail with reference to fig. 4. Fig. 4 (a) and (B) are schematic longitudinal sectional views showing the color change valve 11B. Note that, in the present embodiment, the description will be given mainly on portions different from those in the first embodiment, and only the same reference numerals are given to the same portions, and the detailed description thereof is omitted.

As shown in fig. 4 (a) and (B), the color change valve 11B includes a first permanent magnet 56 as a first magnetic member and a second permanent magnet 57 as a second magnetic member in the valve driving unit 12. The first permanent magnet 56 and the second permanent magnet 57 are both annular magnets, but the arrangement positions are different from the configuration of the first embodiment. The first permanent magnet 56 is inserted into the small diameter portion of the rod portion 42 and fixed so as to contact the center portion of the upper end surface of the piston portion 43. On the other hand, the second permanent magnet 57 is attached to the piston housing 21 side via a cylindrical sleeve 59 (proximity fixing member) made of a nonmagnetic material. Specifically, one end side of the sleeve 59 is fitted into the rod release hole 25 in the head 24, and the other end side reaches the direction in which the piston portion 43 is located. The second permanent magnet 57 is fixed to the end surface on the other end side by an adhesive or the like. As a result, the second permanent magnet 57 can be held and fixed in a state of being disposed facing the first permanent magnet 56 in proximity, as compared with, for example, a case where the second permanent magnet 57 is directly fixed to the top portion. The first permanent magnet 66 and the second permanent magnet 67 are disposed to face each other with different magnetic poles facing each other, and a magnetic attractive force acts therebetween. The sleeve 59 and the second permanent magnet 57 have a hole larger than the outer diameter of the small diameter portion of the rod portion 42 at the center, and are held in a state of non-contact with the rod portion 42.

Even in the color change valve 11B configured as described above, the valve opening and closing control can be performed by driving the valve rod 41 in the vertical direction by supplying and discharging the pilot gas and bringing the valve portion 44 into contact with and away from the valve seat 35. The color change valve 11B is small in size, but can be operated by a relatively low-pressure pilot gas and has excellent durability.

[ fourth embodiment ]

Hereinafter, a color change valve 11C according to a fourth embodiment embodying the valve device of the present invention will be described in detail with reference to fig. 5. Fig. 5 (a) and (b) are schematic longitudinal sectional views showing the color change valve 11C. Note that, in the present embodiment, the description will be given mainly on portions different from those in the first embodiment, and only the same reference numerals are given to the same portions, and the detailed description thereof is omitted.

As shown in fig. 5 (a) and (b), in the color changing valve 11C, a cylindrical sleeve 55 (a proximity fixing member) is attached to a position on the base end side of the piston portion 43 in the small diameter portion of the rod portion 42. The first permanent magnet 56 is disposed above the sleeve 55, and a fastening member such as a nut 69 made of a nonmagnetic material is disposed above the first permanent magnet 56. Then, the first permanent magnet 56 is fixed to the sleeve 55 by tightening the nut 69. Even in the color change valve 11C configured as described above, the valve opening and closing control can be performed by driving the valve rod 41 in the vertical direction by supplying and discharging the pilot gas and bringing the valve portion 44 into contact with and away from the valve seat 35. The color change valve 11C is small in size, but can be operated by a relatively low-pressure pilot gas and has excellent durability.

[ fifth embodiment ]

A color change valve 11D according to a fifth embodiment embodying the valve device of the present invention will be specifically described below with reference to fig. 6. Fig. 6 (a) and (b) are schematic longitudinal sectional views showing the color change valve 11D. Note that, in the present embodiment, the description will be given mainly on portions different from those in the first embodiment, and only the same reference numerals are given to the same portions, and the detailed description thereof is omitted.

In the present embodiment, a member other than the permanent magnet is used as the second magnetic member. As shown in fig. 6 (a) and (b), in the color change valve 11D, a disk-shaped cover member 70 made of a magnetic material is screwed to a portion that becomes the top portion of the piston housing 21, and functions as a second magnetic member. That is, the piston portion 43 is pressed in the first direction a1 by the magnetic attraction acting between the cover member 70 and the first permanent magnet 56. The lid member 70 is formed using an alloy of a ferrous metal and stainless steel as a magnetic material.

[ sixth embodiment ]

Hereinafter, a color change valve 11E according to a sixth embodiment embodying the valve device of the present invention will be described in detail with reference to fig. 7 and 8. Fig. 7 (a) and (b) are schematic longitudinal sectional views showing the color change valve 11E. Fig. 8 is a schematic diagram for explaining a state in which the color change valve 11E is used as a part of the color change device CV 2. Note that, in the present embodiment, the description will be given mainly on portions different from those in the first embodiment, and only the same reference numerals are given to the same portions, and the detailed description thereof is omitted.

As shown in fig. 7 (a) and (b), the color change valve 11E includes the valve driving unit 12, but does not include the valve housing 31 constituting the valve body 13. Therefore, the distal end side of the valve rod 41 protrudes from the piston housing 21 and is exposed to the outside of the color change valve 11E. In the case of this color changing valve 11E, a diaphragm 71 as a spacer member is provided in the rod insertion hole 23 opened in the lower end surface of the piston housing 21. The diaphragm 71 functions to prevent the paint, the cleaning agent, and the like introduced into the flow path 34 from leaking to the piston accommodating space 22 side through the communicating space. An opening is formed in the upper surface of the piston housing 21, and a lid member 73 having an コ -shaped cross section is screwed therein to form the piston accommodating space 22. A mounting recess is formed in the cover member 73 at the opening of the inner end side of the lever release hole 25, and the first permanent magnet 57 is mounted to the mounting recess. Further, a pair of pad accommodating recesses are provided in the lower portion of the side surface of the piston housing 21 and at positions above and below the pilot port 53, and pads 72 are attached to these pad accommodating recesses, respectively.

On the other hand, as shown in fig. 8, the manifold block M2 in the present embodiment is a member having a function as a valve housing, and a plurality of valve attachment recesses 74 are formed at a plurality of locations thereof. The bottom side region of each valve attachment recess 74 serves as a flow path 34 through which paint or the like flows, and the input port 32 and the output port 33 are formed so as to communicate with the portion of the flow path 34. The output port 33 located at the bottom center portion of each valve attachment recess 74 is connected to each sub-passage R2 provided in the manifold block M2, and a valve seat 35 is formed at the connection portion. Further, a plurality of pilot gas introduction paths 75 are provided in the manifold block M2, and each pilot gas introduction path 75 opens on the inner surface of each valve attachment recess 74. The color changing valve 11E is attached to each valve attachment recess 74, thereby configuring the color changing device CV 2.

Even in the color changing CV2 configured as described above, the valve opening and closing control can be performed by driving the valve rod 41 in the vertical direction by the supply and discharge of the pilot gas to and from the color changing valve 11E, and bringing the valve portion 44 into contact with and away from the valve seat 35 on the manifold block M2 side. The color change valve 11B is small in size, but can be operated by a relatively low-pressure pilot gas and has excellent durability.

The embodiments of the present invention may be modified as described below.

For example, as in the color change valve 11F of another embodiment shown in fig. 9, the piston housing space 22 may be closed by a disk-shaped lid member 81 made of a non-magnetic material, and the second permanent magnet 57 may be attached to the lid member 81. In addition, in the color change valve 11G of the other embodiment shown in fig. 10, similarly, the piston housing space 22 may be closed by a long disc-shaped cover member 82 made of a non-magnetic material. That is, the top portion in the piston housing 21 may not be a structure integral with the piston housing 21, and may be a separate structure.

In the first embodiment and the like, the lower sealing member 37 in the support assembly 38 is used to prevent the leakage of the paint, the cleaning agent, and the like to the piston accommodating space 22 side through the communicating space, but the diaphragm 71 may be provided instead.

In each of the above embodiments, the coil spring 54 is used as the urging means, but a spring having a shape other than the coil spring 54 may be used, or an urging means other than a spring may be used.

In the above embodiments, the first

permanent magnets

56, 66 and the second

permanent magnets

57, 67 are both annular, but the shapes thereof are not limited to the annular shape, and may be any shapes.

In the above embodiments, the biasing force of the biasing mechanism acts in the direction of closing the valve, and the pressure of the pilot gas and the attraction force between the permanent magnets act in the direction of opening the valve, but the present invention is not limited to this. That is, the biasing force of the biasing mechanism may act in a direction to open the valve, and the pressure of the pilot gas and the attraction force between the permanent magnets may act in a direction to close the valve.

In the fifth embodiment, the first permanent magnet 56 is provided on the valve rod 41 side as the movable body, and the second magnetic member (the cover member 70) which is not a permanent magnet is provided on the piston housing 21 side as the fixed body. That is, the first magnetic member that is not a permanent magnet may be provided on the valve rod 41 side, and the second permanent magnet 57 may be provided on the piston housing 21 side.

In each of the above embodiments, the approach fixing member is configured independently of the rod portion 42, the piston portion 43, and the piston housing 21, but may be formed integrally with the rod portion 42, the piston portion 43, or the piston housing 21. Similarly, the stopper member may be formed integrally with the rod portion 42, integrally with the piston portion 43, or integrally with the piston housing 21.

In the above embodiments, the valve device of the present invention is used as the color change valves 11 to 11H constituting the color change devices CV1 and CV2 in the painting equipment, but the present invention is not limited thereto, and can be used for other applications.

Next, in addition to the technical ideas described in the claims, the technical ideas that can be grasped by the above embodiments are listed below.

(1) In any one of claims 1 to 6, the biasing force of the biasing mechanism acts in a direction to close the valve, and the pressure of the pilot gas and the magnetic attractive force act in a direction to open the valve.

(2) In any one of claims 1 to 6, the valve component other than the first magnetic component and the second magnetic component is made of a non-magnetic material.

Claims

1. A valve device having:

a housing having a piston accommodating space;

a valve rod having a piston portion provided at a position inside the piston housing space and a valve portion formed at a distal end side outside the piston housing space;

a pilot port provided on the first chamber side of a first chamber and a second chamber defined by the piston portion in the housing, the pilot port being supplied with a pilot gas for driving the piston portion in a first direction along an axis of the valve stem; and

a biasing mechanism provided on the second chamber side in the housing and biasing the piston portion in a second direction opposite to the first direction,

the valve device controls opening and closing of a valve by bringing the valve portion into contact with and away from a valve seat by supply and discharge of the pilot gas, and is characterized by comprising:

a first magnetic member provided on the valve stem side; and

a second magnetic member provided on the housing side in a state of being opposed to the first magnetic member,

at least one of the first magnetic member and the second magnetic member is a permanent magnet,

a magnetic attraction force that drives the piston portion in the first direction and increases as the piston portion approaches each other acts between the first magnetic member and the second magnetic member, and an arrangement relationship is set such that the first magnetic member and the second magnetic member face each other with a gap therebetween even when the first magnetic member and the second magnetic member approach each other most.

2. The valve device according to claim 1,

the magnetic attractive force acting on the piston portion when the pilot gas is not supplied is smaller than the biasing force of the biasing mechanism,

the sum of the magnetic attraction acting on the piston portion when the pilot gas is supplied and the pressing force generated by the pilot gas is larger than the biasing force of the biasing mechanism.

3. The valve device according to claim 1 or 2,

the first magnetic member and the second magnetic member are both permanent magnets,

a proximity fixing member is provided on the valve rod side, and holds and fixes the first permanent magnet as the first magnetic member in a state in which the first permanent magnet is close to the second permanent magnet as the second magnetic member.

4. The valve device according to claim 1 or 2,

a proximity fixing member is provided on the housing side to hold and fix the second permanent magnet as the second magnetic member in a state of being close to the first permanent magnet as the first magnetic member.

5. The valve device according to claim 3 or 4,

a stopper step portion for avoiding collision of the first permanent magnet and the second permanent magnet with each other by abutting against a portion of the piston portion where the first permanent magnet is not present is provided on the housing side.

6. The valve device according to claim 3 or 4,

a stopper member for avoiding collision of the first permanent magnet and the second permanent magnet with each other by abutting against a portion of the housing where the second permanent magnet is not present is provided on the valve stem side.