JP7162435B2 - valve device - Google Patents

Description

The present invention relates to a valve device, and more particularly to a valve device suitable for use as a color change valve for alternatively selecting paints of different colors sent from a paint supply source and supplying them to a coating machine or the like. be.

In recent years, the needs of consumers for the body color of automobiles have been diversifying, and it has become necessary to perform various types of painting work for the same vehicle type. In particular, in the recent automobile body painting line, automobile bodies with different paint colors are conveyed in a mixed manner, so that it is required to apply a different color painting according to the automobile body.

In color change painting, for example, a color change device 101 as shown in FIG. 12 is used. A general conventional color change device 101 has a structure in which a plurality of color change valves 104, cleaning liquid valves 105, cleaning air valves 106, etc. are mounted on a manifold block 103 in which a paint flow path 102 is formed. These multiple color change valves 104 are individually connected to paint supply sources P1 to P4 for each color. Cleaning liquid valve 105 is connected to cleaning liquid supply 107 and cleaning air valve 106 is connected to compressed air supply 108 . By using such a color change device 101, the color change device 101 selectively selects an arbitrary coating color from among the supplied paints of a plurality of colors, and the selected coating color is applied to the coating machine. 109 for coating.

FIG. 13 illustrates a conventional valve device used as the color change valve 104 in this type of color change device 101. As shown in FIG. The color change valve 104 is a pilot-type two-port valve using a piston cylinder as driving means, and is composed of a valve driving portion 112 located on the upper side of the drawing and a valve body portion 113 located on the lower side of the drawing. ing.

A piston housing 121 that constitutes the valve driving portion 112 has a piston housing space 122 therein and a rod insertion hole 123 that communicates with the piston housing space 122 at its lower portion. A valve housing 131 is attached to the lower end surface of the piston housing 121 . An input port 132 is formed on the side surface of the valve housing 131 and an output port 133 is formed on the bottom surface. A valve seat 135 is formed inside the opening of the output port 133 . A support assembly 138 including packings 136, 137 and the like is arranged in the valve housing 131. As shown in FIG.

This color change valve 104 has a valve rod 141 as a movable body having a rod portion 142 , a piston portion 143 and a valve portion 144 . The piston portion 143 is fixed to the proximal end side of the rod portion 142 and is slidably accommodated in the piston accommodation space 122 . The tip 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 integrally formed at the tip of the rod portion 142 and is capable of contacting and separating from the valve seat 135 .

A 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 is formed on the first chamber 151 side of the piston housing 121 to supply pilot air for driving the piston portion 143 upward. In the second chamber 152 of the piston housing 121, an urging means 154 is accommodated that constantly urges the piston portion 143 downward. In the color change valve 104 configured as described above, the valve rod 141 is vertically driven by the supply and discharge of pilot air, and the valve portion 144 is brought into contact with and separated from the valve seat 135, thereby controlling the opening and closing of the valve. It is designed to

In addition, as this type of valve device, for example, a device disclosed in Patent Document 1 has been conventionally proposed.

Japanese Patent No. 5511339 JP 2017-2939 A

By the way, the conventional valve device is required to be as small as possible because it is sometimes mounted on a drive portion such as an arm of a coating machine. However, when attempting to miniaturize the valve device, the diameter of the piston must be reduced, resulting 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, it becomes necessary to increase the pressure of the pilot air (for example, from 0.4 MPa to 0.8 MPa). I have no choice but to make it higher.

Under such circumstances, there has been conventionally proposed a valve device that uses the magnetic force of a magnet to assist the piston driving force based on pilot air (see, for example, Patent Document 2). However, in the case of this conventional device, in addition to the complicated structure, the magnet housed in the housing is in direct contact with the partition wall. There is also a concern that it may be damaged, and there is also a problem of low durability.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and its object is to provide a valve device that can operate with relatively low-pressure pilot air in spite of its small size and has excellent durability. to do.

In order to solve the above-mentioned problems, the invention described in means 1 is a housing having a piston housing space, a piston portion provided at a position inside the piston housing space, and a valve on the tip side outside the piston housing space. a valve rod having a portion formed thereon; and a first chamber and a second chamber defined by the piston portion in the housing, provided on the first chamber side, and the piston portion is arranged along the axis of the valve rod. a pilot port supplied with pilot air for driving in a first direction; and biasing means provided on the second chamber side of the housing for biasing the piston portion in a second direction opposite to the first direction. and a valve device that controls opening and closing of the valve by bringing the valve portion into contact with and separating from the valve seat by supplying and discharging the pilot air, wherein the first 1 permanent magnet, and a second permanent magnet as a second magnetic member provided on the housing side in a state facing the first permanent magnet. The valve component disposed in contact with one of the permanent magnets is made of a non-magnetic material, and between the two permanent magnets, the piston portion is driven in the first direction, and as they approach each other, An increasing magnetic attractive force acts, and an arrangement relationship is set in which the two permanent magnets face each other across a gap even when they are closest to each other . The magnetic attraction force acts even when the pilot air is not supplied, and the magnetic attraction force at that time is the minimum value of the magnetic attraction force and is smaller than the biasing force of the biasing means. The gist of the valve device is to

Therefore, according to the invention described in Means 1, a magnetic attraction force acts between the two magnetic members to drive the piston portion in the first direction and increase as the two magnetic members approach each other. Therefore, when the pilot air is supplied, the valve rod is driven in the first direction by the magnetic attraction force acting in addition to the pressure of the pilot air. Therefore, even if the pressure receiving area of the piston portion is small, the opening and closing of the valve can be controlled using relatively low-pressure pilot air. In addition, even when the two magnetic members are closest to each other, the two magnetic members are arranged to face each other with a gap therebetween. In addition, contact of the magnetic member with the inner wall of the housing is also avoided. Therefore, the occurrence of noise and breakage due to the contact of the magnetic member is less likely to occur, and the durability is improved.

In the invention described in means 2, in means 1, the sum of the magnetic attraction force acting on the piston portion when the pilot air is supplied and the pressing force of the pilot air is greater than the urging force of the urging means. The gist of it is that it is also large.

The invention described in means 3 is a state in which, in means 1 or 2, a first permanent magnet as the first magnetic member is brought close to a second permanent magnet as the second magnetic member on the valve rod side. The gist of this is that a proximal fixing member is provided for holding and fixing with.

Therefore, according to the invention described in means 3, it is possible to bring the first permanent magnet close to the second permanent magnet, so that the magnetic attraction force can be efficiently exerted between the two permanent magnets.

According to the invention described in means 4, in means 1 or 2, a second permanent magnet as the second magnetic member is placed close to the first permanent magnet as the first magnetic member on the housing side. The gist of this is that a proximal fixing member is provided for holding and fixing.

Therefore, according to the invention described in means 4, it is possible to bring the second permanent magnet close to the first permanent magnet, so that the magnetic attraction force can be efficiently exerted between the two permanent magnets.

According to the invention described in means 5, in means 3 or 4, the housing side is provided with a member for avoiding collision between the permanent magnets by contacting a portion of the piston portion where the first permanent magnet does not exist. The gist of this is that a stopper stepped portion is provided.

Therefore, according to the invention described in Means 5, the location and the stepped portion of the stopper preferentially abut against each other, thereby avoiding abutment between the two permanent magnets. As a result, noise and damage are less likely to occur. Become.

According to the invention described in means 6, in means 3 or 4, the valve rod side is provided with a contact member for avoiding collision between the permanent magnets by contacting a portion of the housing where the second permanent magnet does not exist. The gist thereof is that a stopper member is provided.

Therefore, according to the invention described in means 6, the location and the stopper member preferentially abut against each other, thereby avoiding the abutment of the two permanent magnets, and as a result, the occurrence of noise and damage are less likely to occur. .

As described in detail above, according to the inventions of claims 1 to 6, there is provided a valve device that can operate with relatively low-pressure pilot air in spite of its small size and that is excellent in durability. can do.

1(a) and 1(b) are schematic longitudinal sectional views showing a valve device of a first embodiment embodying the present invention; FIG. Schematic diagram for explaining the state of the valve device of the first embodiment when in use. (a) and (b) are schematic longitudinal sectional views showing a valve device of a second embodiment embodying the present invention. (a) and (b) are schematic longitudinal sectional views showing a valve device of a third embodiment embodying the present invention. (a) and (b) are schematic longitudinal sectional views showing a valve device of a fourth embodiment embodying the present invention. (a) And (b) is a schematic longitudinal cross-sectional view which shows the valve apparatus of 5th Embodiment which actualized this invention. The schematic longitudinal cross-sectional view which shows the valve apparatus of 6th Embodiment which actualized this invention. The schematic for demonstrating the usage example of the valve apparatus of 6th Embodiment. (a) and (b) are schematic longitudinal sectional views showing a valve device of another embodiment embodying the present invention. (a) and (b) are schematic longitudinal sectional views showing a valve device of another embodiment embodying the present invention. (a) and (b) are schematic longitudinal sectional views showing a valve device of another embodiment embodying the present invention. Schematic diagram for explaining the configuration of a color changing device using a valve device. FIG. 2 is a schematic longitudinal sectional view showing a conventional valve device;

[First embodiment]
A color change valve 11 of an embodiment embodying the valve device of the present invention will be described in detail below with reference to FIGS. 1 and 2. FIG. 1(a) and 1(b) are schematic longitudinal sectional views showing the color change valve 11, and FIG. 2 is a schematic for explaining the state when the color change valve 11 is used as part of the color change device CV1. It is a diagram.

As shown in FIG. 1, the color change valve 11 of the present embodiment is a pilot-type two-port valve using a piston cylinder as driving means. , and the valve body portion 13 located at the .

A piston housing 21 forming 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 in the lower central portion. A valve housing 31 is attached to the lower end surface of the piston housing 21 . An input port 32 is formed in the side surface of the valve housing 31, and an output port 33 is formed in the center of the lower surface. A flow path 34 through which paint flows is formed in the valve housing 31, and the input port 32 and the output port 33 communicate with the flow path 34, respectively. A valve seat 35 having a tapered cross section is formed inside the opening of the output port 33 . Further, in the interior of the valve housing 31, in a region (communication space) connecting the flow path 34 and the rod insertion hole 23 on the piston housing 21 side, a cylindrical shape including sealing members 36, 37 and the like is provided. A support assembly 38 is provided. Here, the sealing member 36 prevents pilot air from leaking from the piston accommodation space 22 side to the flow path 34 side via the communication space. The sealing member 37 prevents paint, cleaning agent, etc. introduced into the flow path 34 from leaking into the piston accommodation space 22 through the communication space.

This color change valve 11 has a valve rod 41 as a movable body having 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 . The rod portion 42 of this embodiment has a large diameter portion with a relatively large diameter in the lower half, and a small diameter portion with a relatively small diameter in the upper half. A disk-shaped piston portion 43 is fixed at a small diameter portion of the rod portion 42 , that is, at a position within the piston housing space 22 . The piston part 43 is housed in the piston housing space 22 and is slidable in the vertical direction in that 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.

A lower end side (front end side) of the rod portion 42 protrudes to a region outside the piston housing space 22 through the rod insertion hole 23 . The lower end side (tip side) of the rod portion 42 passes through the center hole of the support assembly 38 and is exposed to the flow path 34 inside the valve housing 31 . A valve portion 44 having a tapered surface is integrally formed at the tip of the rod portion 42 and can contact and separate from the valve seat 35 as the valve rod 41 moves up and down. Incidentally, FIG. 1(a) shows a state in which the valve portion 44 is in contact with the valve seat 35, and FIG.

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

The second chamber 52 in the piston housing 21 communicates with the atmospheric pressure region through a rod relief hole 25 provided in the center of the ceiling portion 24 . The upper end of the small diameter portion of the rod portion 42 is inserted through the rod escape hole 25 in a non-contact state at all times. A coil spring 54 as an urging means is housed in the second chamber 52 in a compressed state. One end of the coil spring 54 is in contact with the upper end surface of the piston portion 43 and the other end is in contact with the inner wall surface of the ceiling portion 24 of the piston housing 21 . As a result, the coil spring 54 always exerts an urging force that urges the piston portion 43 downward.

Next, a mechanism for assisting the piston driving force based on pilot air by using magnetic force will be described. The color change valve 11 of this 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 portion 12 .

The second permanent magnet 57 is an annular magnet and is mounted in a mounting recess formed in the inner end side opening of the rod relief hole 25 in the ceiling portion 24 . On the other hand, the first permanent magnet 56 is also an annular magnet, and has a size that can be fitted to the small-diameter portion of the rod portion 42 . This first permanent magnet 56 is made somewhat smaller than the inner diameter of the coil spring 54 so that it can be arranged 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 approximately the same size as the first permanent magnet 56 . As the first permanent magnet 56 and the second permanent magnet 57, conventionally known arbitrary permanent magnets can be used, but in this embodiment, neodymium magnets with strong magnetic force are used. In addition, for example, samarium-cobalt magnets, ferrite magnets, alnico magnets, etc. may be used.

A cylindrical sleeve 55 (proximity fixing member) is mounted at a position closer to the proximal end than the piston portion 43 in the small diameter portion of the rod portion 42 . The sleeve 55 is made of a non-magnetic material (for example, non-magnetic metal such as synthetic resin or aluminum) and has a predetermined length. 1 permanent magnet 56 is fixed by adhesion or the like. As a result, compared to the case where the first permanent magnet 56 is directly fixed to the upper end surface of the piston portion 43, the first permanent magnet 56 is held and fixed in a state of being arranged facing the second permanent magnet 57 closer to the second permanent magnet 57. be.

Also, between the first permanent magnet 56 and the second permanent magnet 57, an arrangement is made such that a magnetic force that drives the piston portion 43 in the upward direction A1 (first direction) in FIG. 1, that is, a magnetic attraction force acts. relationship is set. Therefore, the first permanent magnet 56 and the second permanent magnet 57 are arranged to face each other with different polarities facing each other. In this case, the magnetic attraction force increases as the first permanent magnet 56 and the second permanent magnet 57 approach each other, and reaches its maximum in the state shown in FIG.

A stopper stepped portion 58 is provided on the inner wall surface of the side wall portion of the second chamber 52 in the piston housing 21 to prevent the first permanent magnet 56 and the second permanent magnet 57 from colliding with each other. A portion of the piston portion 43 where the first permanent magnet 56 does not exist, specifically, the outer peripheral portion of the piston portion 43 on the side of the upper end surface abuts against the stopper stepped portion 58 . As a result of this contact, 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 were closest to each other, a slight gap (for example, a gap of about 1 to 5 mm) was formed between them. An arrangement relationship is set between the two so that the first permanent magnet 56 stops in this state. Specifically, the above arrangement relationship is set by adjusting the length of the sleeve 55 to a suitable value.

Here, when the pilot air is not supplied, as shown in FIG. and the pressing force due to the atmospheric pressure acting in the second direction A2 is canceled. At this time, the piston portion 43 is subjected to the urging force of the coil spring 54 that tends to press the piston portion 43 in the second direction A2, and the magnetic field that tends to press the piston portion 43 in the first direction A1. Attraction is working. However, since the first permanent magnet 56 and the second permanent magnet 57 are the farthest apart from each other, the magnetic attractive force is the minimum value at this time. At this time, since the magnetic attraction force is set to be smaller than the biasing force of the coil spring 54, the piston portion 43 moves in the second direction A2. As a result, the valve rod 41 moves downward and the valve portion 44 comes into contact with the valve seat 35, closing the flow path 34. As shown in FIG. That is, in the color change valve 11 of this embodiment, the valve is reliably closed by the biasing force of the coil spring 54 even when the pilot air is shut off.

When the pilot air is supplied as shown in FIG. 1B, the inside of the second chamber 52 remains in the atmospheric pressure region, while the pilot air pressurized from the pilot port 53 is introduced into the first chamber 51. be done. As a result, the pressure of the pilot air acts on the lower surface side of the piston portion 43, and a force acts to press the piston portion 43 in the first direction A1. The total sum of the pressing force of the pilot air and the magnetic attraction force is set in advance to be greater than the biasing force of the coil spring 54 . Therefore, the pressing force of the pilot air and the magnetic attraction force act simultaneously, so that the piston portion 43 moves in the first direction A<b>1 against the biasing force of the coil spring 54 and comes into contact with the stopper stepped portion 58 . stopped. As a result, the valve rod 41 moves upward, the valve portion 44 is separated from the valve seat 35, and the flow path 34 is opened.

Next, the operation when the color change valve 11 of this embodiment configured as described above is used as a part of the color change device CV1 will be described. As shown in FIG. 2, the color change valve 11 of this embodiment is used in a state in which a plurality of color change valves 11 are connected to a manifold block M1, for example. A main flow path R1, which is a paint flow path, is formed in the manifold block M1, and sub-flow paths R2 branched from the main flow path R1 are formed at a plurality of locations. The main flow path R1 is connected to a coating machine (not shown). Each color change valve 11 is mounted with the valve housing 31 side in contact with the manifold block M1 so that the opening of each secondary flow path R2 and each output port 33 communicate with each other. Also, the input ports 32 of each color change valve 11 are connected to separate paint supply sources (not shown). A pilot port 53 of each color change valve 11 is connected to an air compressor (not shown) for supplying pilot air via a fluid control device such as an electromagnetic valve (not shown). In the case of this embodiment, for example, relatively low-pressure air of about 0.4 MPa is supplied.

In an initial state in which pilot air is not supplied to each color change valve 11, the flow path 34 of each color change valve 11 is closed, so paint is supplied to the sub-flow path R2 and the main flow path R1 side. not. Here, when pilot air is supplied to a specific color change valve 11, the valve rod 41 of the color change valve 11 is driven from the position shown in FIG. 1(a) to the position shown in FIG. 1(b). As a result, the valve portion 44 is in an open state away from the valve seat 35 , and the input port 32 and the output port 33 are communicated with each other via the flow path 34 . Accordingly, a predetermined paint flows from the color change valve 11 side to the manifold block M1 side, and the paint is supplied to the coating machine side. When the supply of pilot air to the color change valve 11 is stopped, the valve rod 41 of the color change valve 11 returns from the position shown in FIG. 1(b) to the position shown in FIG. 1(a). As a result, the valve portion 44 is in a closed state in contact with the valve seat 35, and the communication between the input port 32 and the output port 33 is cut off. Therefore, the specified paint does not flow from the color change valve 11 side to the manifold block M1 side, and the supply of the paint to the coating machine side is stopped.

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

(1) According to the color change valve 11 of the present embodiment, the piston portion 43 is driven in the first direction A1 between the first permanent magnet 56 and the second permanent magnet 57 and increases as they approach each other. Magnetic attraction acts. Therefore, when the pilot air is supplied, the valve rod 41 is driven in the first direction A1 by the magnetic attraction force acting in addition to the pressure of the pilot air. 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 relatively low-pressure pilot air. Further, the first permanent magnet 56 and the second permanent magnet 57 are arranged to face each other with an air gap even when they are closest to each other. Therefore, when the valve rod 41 is driven, contact between the first permanent magnet 56 and the second permanent magnet 57 is avoided, and contact between the first permanent magnet 56 and the second permanent magnet 57 against the inner wall of the piston housing 21 is prevented. contact is also avoided. Therefore, the occurrence of noise and breakage due to the contact of these members is less likely to occur, and the durability is improved. As described above, according to the present embodiment, it is possible to provide the color change valve 11 that is compact and lightweight, can be operated with relatively low-pressure pilot air, and has excellent durability. .

(2) In the case of this color change valve 11 , the magnetic attraction force acting on the piston portion 43 when pilot air is not supplied is set to be smaller than the biasing force of the coil spring 54 . Therefore, the urging force of the coil spring 54 moves the valve rod 41 to a position where the valve portion 44 abuts against the valve seat 35, and the valve is reliably held closed. Further, the total sum of the magnetic attraction force acting on the piston portion 43 when the pilot air is supplied and the pressing force of the pilot air is set to be greater than the biasing force of the coil spring 54 . Therefore, the combined force of the magnetic attraction force and the pressing force of the pilot air moves the valve rod 41 to a position where the valve portion 44 is separated from the valve seat 35, and the valve is reliably held open. In this embodiment, since the valve is normally closed by the biasing force of the coil spring 54 when pilot air is not supplied, most of the plurality of color change valves 11 are closed. It is possible to reduce the amount of pilot air supplied when operating the color changing device CV1.

(3) In the case of this color change valve 11, 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 large magnetic attraction force can be applied compared to . Moreover, since the valve rod 41 side is provided with the sleeve 55 for holding and fixing the first permanent magnet 56 close to the second permanent magnet 57, a large magnetic attraction force can efficiently act between them. can be done.

(4) In the case of this color change valve 11, the piston housing 21 side is provided with a stopper stepped portion 58 that abuts against the outer peripheral portion of the upper end surface of the piston portion 43 where the first permanent magnet 56 is not present. Therefore, when the valve rod 41 moves in the first direction A1, the portion and the stopper stepped portion 58 preferentially come into contact with each other. Avoided. As a result, noise generation and breakage are less likely to occur.

(5) In the case of this color change valve 11, 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. Non-magnetic members are used for the piston housing 21, valve housing 31, rod portion 42, piston portion 43, support assembly 38, etc.). Therefore, the magnetic attraction force can act only between the first permanent magnet 56 and the second permanent magnet 57 without the magnetic force acting between the valve components.

[Second embodiment]
A color change valve 11A of a second embodiment embodying the valve device of the present invention will be described in detail below with reference to FIG. 3(a) and 3(b) are schematic longitudinal sectional views showing the color change valve 11A. In addition, in the present embodiment, the description will focus on the portions that are different from the first embodiment, and the same member numbers will only be assigned to the common portions, and detailed description will be omitted.

As shown in FIGS. 3(a) and 3(b), the color change valve 11A has a first permanent magnet 66 as a first magnetic member and a second permanent magnet 66 as a second magnetic member in the valve drive section 12. 67. Both the first permanent magnet 66 and the second permanent magnet 67 are ring-shaped magnets, but differ from those of the first embodiment in size and location. The first permanent magnet 66 has substantially the same outer diameter as the piston portion 43 and is mounted in a mounting recess formed on the outer periphery of the upper end surface of the piston portion 43 . The second permanent magnet 67 also has approximately the same outside diameter as the first permanent magnet 66 . A mounting recess is formed in the stepped portion of the inner wall surface of the side portion of the second chamber 52 in the piston housing 21, and the second permanent magnet 67 is attached to the mounting recess. Therefore, the first permanent magnet 66 and the second permanent magnet 67 are arranged to face each other with different polarities facing each other.

In the case of this embodiment, a cylindrical stopper member 68 made of a non-magnetic material is fixed at a position closer to the proximal end than 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 does not exist, specifically the inner wall surface of the ceiling portion 24 . As a result of this contact, 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 were closest to each other, a slight gap (for example, a gap of about 1 to 5 mm) was formed between them. An arrangement relationship is set between the two so that the first permanent magnet 66 stops in this state.

Even in the color change valve 11A configured as described above, the valve rod 41 is vertically driven by the supply and discharge of pilot air to bring the valve portion 44 into contact with and separate from the valve seat 35, thereby opening and closing the valve. control is possible. Moreover, such a color change valve 11A can be operated with relatively low-pressure pilot air in spite of its small size, and can be made excellent in durability.

[Third Embodiment]
A color change valve 11B of a third embodiment embodying the valve device of the present invention will be described in detail below with reference to FIG. 4(a) and 4(b) are schematic longitudinal sectional views showing the color change valve 11B. In addition, in the present embodiment, the description will focus on the portions that are different from the first embodiment, and the same member numbers will only be assigned to the common portions, and detailed description will be omitted.

As shown in FIGS. 4A and 4B, the color change valve 11B has a first permanent magnet 56 as a first magnetic member and a second permanent magnet 56 as a second magnetic member in the valve drive section 12. 57. Both the first permanent magnet 56 and the second permanent magnet 57 are ring-shaped magnets, but their installation locations are different from those of the first embodiment. The first permanent magnet 56 is inserted through the small-diameter portion of the rod portion 42 and is fixed in contact with the central portion of the upper end face of the piston portion 43 . On the other hand, the second permanent magnet 57 is attached to the piston housing 21 via a cylindrical sleeve 59 (proximity fixing member) made of a non-magnetic material. Specifically, one end of the sleeve 59 is attached to the rod relief hole 25 in the ceiling portion 24 and the other end extends in the direction of the piston portion 43 . A second permanent magnet 57 is fixed by an adhesive or the like to the end face on the other end side. As a result, compared to the case where the second permanent magnet 57 is fixed directly to the ceiling, for example, the second permanent magnet 57 is held and fixed in a state of facing the first permanent magnet 56 closer to the first permanent magnet 56 . The first permanent magnet 66 and the second permanent magnet 67 have opposite polarities, and magnetic attraction acts between them. The sleeve 59 and the second permanent magnet 57 have a hole at the center that is larger than the outer diameter of the small-diameter portion of the rod portion 42 so as to keep them out of contact with the rod portion 42 .

Even in the color change valve 11B configured as described above, the valve rod 41 is driven vertically by the supply and discharge of pilot air, and the valve portion 44 is brought into contact with and separated from the valve seat 35, thereby opening and closing the valve. control is possible. Moreover, such a color change valve 11B can be operated with relatively low-pressure pilot air in spite of its small size, and can be made excellent in durability.

[Fourth embodiment]
Hereinafter, a color change valve 11C of a fourth embodiment embodying the valve device of the present invention will be described in detail with reference to FIG. 5(a) and 5(b) are schematic longitudinal sectional views showing the color change valve 11C. In addition, in the present embodiment, the description will focus on the portions that are different from the first embodiment, and the same member numbers will only be assigned to the common portions, and detailed description will be omitted.

As shown in FIGS. 5(a) and 5(b), in the color change valve 11C, a cylindrical sleeve 55 (proximity fixing member) is installed. A first permanent magnet 56 is arranged on the upper side of the sleeve 55, and a fastening member such as a nut 69 made of a non-magnetic material is arranged on the upper side thereof. 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 rod 41 is vertically driven by the supply and discharge of pilot air to bring the valve portion 44 into and out of contact with the valve seat 35. It is possible to control the opening and closing of the Moreover, such a color change valve 11C can be operated with relatively low-pressure pilot air in spite of its small size, and can be made excellent in durability.

[Fifth embodiment]
A color change valve 11D of a fifth embodiment embodying the valve device of the present invention will be described in detail below with reference to FIG. 6(a) and 6(b) are schematic longitudinal sectional views showing the color change valve 11D. In addition, in the present embodiment, the description will focus on the portions that are different from the first embodiment, and the same member numbers will only be assigned to the common portions, and detailed description will be omitted.

In this embodiment, something other than a permanent magnet is used as the second magnetic member. As shown in FIGS. 6(a) and 6(b), in the color change valve 11D, a disk-shaped lid member 70 made of a magnetic material is screwed to the ceiling of the piston housing 21. As shown in FIGS. , which function as the second magnetic member. That is, the piston portion 43 is pressed in the first direction A1 by the magnetic attraction force acting between the lid member 70 and the first permanent magnet 56 . Note that the lid member 70 is formed using a ferrous metal, an alloy of stainless steel that is a magnetic material, or the like.

[Sixth embodiment]
A color change valve 11E of a sixth embodiment embodying the valve device of the present invention will be described in detail below with reference to FIGS. 7 and 8. FIG. 7(a) and 7(b) are schematic longitudinal sectional views showing the color change valve 11E. FIG. 8 is a schematic diagram for explaining the state when the color change valve 11E is used as part of the color change device CV2. In addition, in this embodiment, the description will focus on the portions that are different from the first embodiment, and the same member numbers will only be assigned to the common portions, and detailed description will be omitted.

As shown in FIGS. 7(a) and 7(b), this color change valve 11E includes a valve driving portion 12 but does not include a valve housing 31 that constitutes a valve body portion 13. As shown in FIGS. Therefore, the tip 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 change valve 11E, a diaphragm 71 as a separating member is provided in the rod insertion hole 23 opened at the lower end surface of the piston housing 21. As shown in FIG. The diaphragm 71 plays a role of preventing paint, cleaning agent, and the like introduced into the flow path 34 from leaking to the piston housing space 22 through the communication space. Further, an opening is formed in the upper surface of the piston housing 21, and a piston housing space 22 is formed by screwing a lid member 73 having a U-shaped cross section thereon. A mounting recess is formed in the opening on the inner end side of the rod relief hole 25 in the lid member 73, and the first permanent magnet 57 is attached to the mounting recess. A pair of packing accommodating recesses are provided above and below the pilot port 53 in the lower side surface of the piston housing 21, and packings 72 are mounted in these packing accommodating recesses.

On the other hand, as shown in FIG. 8, the manifold block M2 in this embodiment functions as a valve housing, and a plurality of valve mounting recesses 74 are formed at a plurality of locations. The bottom side area of each valve mounting recess 74 serves as a channel 34 through which paint or the like flows. The output port 33 located at the center of the bottom of each valve mounting recess 74 is connected to each sub-flow path R2 provided in the manifold block M2, and a valve seat 35 is formed at the connecting portion. A plurality of pilot air introduction paths 75 are provided in the manifold block M2, and each pilot air introduction path 75 opens on the inner side surface of each valve mounting recess 74. As shown in FIG. The color changing device CV2 is configured by mounting the color change valve 11E in each valve mounting recess 74, respectively.

Even in the color change device CV2 configured as described above, the valve rod 41 is vertically driven by the supply and discharge of pilot air to the color change valve 11E, and the valve portion 44 is moved to the valve seat 35 on the manifold block M2 side. can be brought into contact with and separated from. Therefore, it is possible to control the opening and closing of the valve. Moreover, such a color change valve 11E can be operated with relatively low-pressure pilot air in spite of its small size, and can be made excellent in durability.

It should be noted that the embodiment of the present invention may be modified as follows.

- For example, like a color change valve 11F of another embodiment shown in FIG. may be attached. Similarly, in the color change valve 11G of another embodiment shown in FIG. 10, the piston housing space 22 may be closed with a disk-shaped cover member 82 made of a non-magnetic material. In other words, the ceiling portion of the piston housing 21 may not have a structure integrated with the piston housing 21, and may have a separate structure.

In the first embodiment and the like, the seal member 37 on the lower side of the support assembly 38 is used to prevent paint, cleaning agent, etc. from leaking into the piston housing space 22 through the communication space. Alternatively, a diaphragm 71 may be provided.

- Although the coil spring 54 is used as the biasing means in each of the above embodiments, a spring having a shape other than the coil spring 54 may be used, or a biasing means other than the spring may be used.

- In each of the above embodiments, the first permanent magnets 56, 66 and the second permanent magnets 57, 67 are both ring-shaped, but these shapes are not limited to ring-shaped, and may be any shape.

- In each of the above embodiments, the biasing force of the biasing means acts in the direction of closing the valve, and the pressure of the pilot air and the attractive force between the permanent magnets act in the direction of opening the valve. It is not limited to this. That is, the urging force of the urging means may act in the direction to open the valve, and the pressure of the pilot air and the attractive force between the permanent magnets may act in the direction to close the valve.

- In the fifth embodiment, the first permanent magnet 56 is provided on the side of the valve rod 41, which is a moving body, and the second magnetic member (cover member 70), which is not a permanent magnet, is provided on the side of the piston housing 21, which is a fixed body. but this can be reversed. That is, the first magnetic member, which 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-described embodiments, the proximity fixing member was configured separately from the rod portion 42, the piston portion 43, and the piston housing 21. may be integrally formed with Similarly, the stopper member may be formed integrally with the rod portion 42 , the piston portion 43 , or the piston housing 21 .

- In each of the above embodiments, the valve device of the present invention was used as the color change valves 11 to 11H constituting the color change devices CV1 and CV2 in the coating equipment, but it is not limited to this, and can be used for other purposes. Of course it's fine.

Next, in addition to the technical ideas described in the claims, technical ideas grasped by each of the above-described embodiments are listed below.

(1) In any one of claims 1 to 6, the biasing force of the biasing means acts in the direction of closing the valve, while the pressure of the pilot air and the magnetic attraction force act in the direction of opening the valve. to act on

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

11, 11A, 11B, 11C, 11D, 11E. 11F, 11G, 11H Color change valve as valve device 21 (piston) housing 22 Piston housing space 35 Valve seat 41 Valve rod 43 Piston portion 51 First chamber 52 Second chamber 53 Pilot port 56, 66... First permanent magnets 57, 67 as first magnetic members... Second permanent magnets 70 as second magnetic members... Lid members 55, 59 made of magnetic material as second magnetic members... As proximity fixing members sleeve 58 stopper stepped portion 68 stopper member A1 first direction A2 second direction

Claims (6)

a housing having a piston housing space;
a valve rod provided with a piston portion at a position inside the piston housing space and having a valve portion formed at a tip side outside the piston housing space;
Pilot air is provided on the first chamber side of the first chamber and the second chamber defined by the piston portion in the housing and drives the piston portion in the first direction along the axis of the valve rod. a supplied pilot port;
biasing means provided on the second chamber side of the housing for biasing the piston portion in a second direction opposite to the first direction; A valve device that controls the opening and closing of a valve by contacting and separating from a seat,
A first permanent magnet as a first magnetic member provided on the valve rod side, and a second permanent magnet as a second magnetic member provided on the housing side facing the first permanent magnet. ,
Of the valve components other than the two permanent magnets, the valve component arranged in contact with one of the two permanent magnets is made of a non-magnetic material,
Between the two permanent magnets, a magnetic attraction force acts between the two permanent magnets to drive the piston portion in the first direction and increase as they approach each other. The placement relationship is set to face apart,
The magnetic attraction force acts between the two permanent magnets even when the pilot air is not supplied, which is the time when the two permanent magnets are the most separated. smaller than the biasing force of the biasing means
A valve device characterized by: 2. The apparatus according to claim 1, wherein the sum of the magnetic attraction force acting on the piston portion when the pilot air is supplied and the pressing force of the pilot air is greater than the urging force of the urging means. valve device. A proximity fixing member is provided on the valve rod side to hold and fix the first permanent magnet as the first magnetic member in a state of being close to the second permanent magnet as the second magnetic member. 3. The valve device according to claim 1 or 2. A proximity fixing member is provided on the housing side for holding and fixing the second permanent magnet as the second magnetic member in a state of being brought close to the first permanent magnet as the first magnetic member. 3. The valve device according to claim 1 or 2. A stopper stepped portion is provided on the housing side for avoiding collision between the permanent magnets by coming into contact with a portion of the piston portion where the first permanent magnet does not exist. 5. The valve device according to item 3 or 4. 3. A stopper member is provided on the valve rod side for avoiding collision between the permanent magnets by coming into contact with a portion of the housing where the second permanent magnet does not exist. 5. The valve device according to 3 or 4.

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