Paint on-off valve

Abstract

To prevent malfunction of an on-off valve caused by pigments contained in paint.SOLUTION: A paint on-off valve includes: a paint flow path 12 having a valve port 13, a valve body 20 accommodated in the paint flow path 12 and movable between an open valve position, in which the valve port 13 is opened, and a closed valve position, in which the valve port 13 is closed; and a magnetic drive member driven-side permanent magnet 25, piston 40 and driving-side permanent magnet 45 configured to hold the valve body 20 in the closed valve position by magnetic force and, when the magnetic force is released, to allow the valve body 20 to move to the open valve position.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a paint on-off valve. [Background technology]

[0002] Patent Document 1 discloses a paint flow rate switching valve that throttles the paint flow rate by abutting a valve provided in a paint flow path with a seat, and increases the paint flow rate by moving the valve away from the seat. The valve is connected to a piston via a bearing. The piston is pressed by the elastic force of a spring in a direction that causes the valve to abut with the seat. When operating air is supplied to the air chamber, the piston moves against the elastic force of the spring to move the valve away from the seat. Of the two ends of the shaft, the end connected to the piston is located within the air chamber, and the end connected to the valve is located within the paint flow path. The paint flow path and the air chamber are hermetically separated by a seal that is in close contact with the outer circumferential surface of the shaft. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2001-219110 Summary of the Invention [Problem to be solved by the invention]

[0004] When the valve moves in and out of contact with the seat, the shaft slides against the seal. If the paint contains pigment, the pigment can get caught between the shaft and the seal and adhere to the surface of the seal, hindering the smooth operation of the shaft and valve. This has required periodic or occasional maintenance.

[0005] The present invention was developed in light of the above-mentioned circumstances, and has an object to prevent malfunction of the on-off valve caused by the pigment contained in the paint. [Means for solving the problem]

[0006] The paint on-off valve of the present disclosure comprises: a paint flow path having a valve port; a valve body accommodated in the paint flow path and movable between a valve open position at which the valve port is opened and a valve closed position at which the valve port is closed; The valve element is provided with a magnetic driving member that holds the valve element in the valve-closed position by magnetic force and that enables the valve element to move to the valve-open position when the magnetic force is released. [Effects of the Invention]

[0007] This configuration makes it possible to prevent malfunction of the on-off valve caused by the pigment contained in the paint. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a front cross-sectional view showing a paint on-off valve of Example 1 in a closed state. FIG. [Figure 2] FIG. 2 is a front cross-sectional view showing the paint on-off valve in an open state. [Figure 3] FIG. 2 is a cross-sectional view taken along line XX in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0009] [Description of the embodiments of the present disclosure] First, embodiments of the present disclosure will be listed and described. Any combination of the following embodiments without causing any contradiction is also included in the embodiments for carrying out the invention. The paint on-off valve of the present disclosure comprises: (1) A paint flow passage having a valve orifice, a valve element housed within the paint flow passage and movable between an open position that opens the valve orifice and a closed position that closes the valve orifice, and a magnetically driven member that holds the valve element in the closed position by magnetic force and enables the valve element to move to the open position by releasing the magnetic force. This configuration eliminates the need for a penetrating member that penetrates from the interior of the paint flow passage to the exterior of the paint flow passage, and therefore eliminates the need for a sealing member to seal between the interior and exterior of the paint flow passage. Therefore, even if the paint contains pigment, it is possible to prevent the movement of the valve element from being impeded by the pigment getting caught in the paint.

[0010] (2) In (1), it is preferable that the magnetically driven member includes a driven permanent magnet that moves integrally with the valve disc, a piston that can move toward and away from the valve disc, and a drive permanent magnet that moves integrally with the piston and is arranged with like poles facing the driven permanent magnet, wherein the valve disc is held in the closed position by magnetic repulsion between the drive permanent magnet and the driven permanent magnet, and the valve disc can be moved to the open position by moving the piston away from the valve disc. With this configuration, the piston is located on the opposite side of the valve disc from the valve opening, so the driven permanent magnet can be located at the end of the valve disc opposite the valve opening. The end where the driven permanent magnet is located is not subject to shape restrictions for abutting against the valve opening, allowing for greater freedom in determining the position and size of the driven permanent magnet.

[0011] (3) In (2), it is preferable that the valve disc is arranged to open and close the valve port from a secondary chamber side, which is a flow path downstream of the valve port in the paint flow path, and the secondary chamber is composed of a driven-side working chamber for moving the valve disc, and an outflow path extending radially outward from the inner circumferential surface of the driven-side working chamber intersecting the movement direction of the valve disc. With this configuration, the drive-side working chamber for moving the piston can be arranged near the driven-side working chamber of the valve disc, so that the drive-side permanent magnet and the driven-side permanent magnet can be arranged close to each other, and the magnetic repulsion force between the drive-side permanent magnet and the driven-side permanent magnet can be increased.

[0012] (4) In (3), it is preferable that the piston moves coaxially with the valve disc on an extension of the movement path of the valve disc. With this configuration, it is possible to reduce the diameter (size) of the piston on a two-dimensional plane intersecting the movement direction of the valve disc, compared to when the piston moves in a direction intersecting the movement direction of the valve disc.

[0013] (5) In (2) to (4), it is preferable that the paint flow path and the drive-side working chamber for moving the piston are separated by a partition wall. This configuration can prevent the movement of the piston from being hindered by paint adhering to the piston.

[0014] (6) In (1) to (4), it is preferable that the paint flow path has a guide wall that faces the outer peripheral surface of the valve disc in close proximity. With this configuration, even if the attitude or position of the valve disc changes during its movement, the valve disc slides against the guide wall, thereby suppressing the amount of change in attitude and position of the valve disc. Therefore, the valve opening can be reliably closed by the valve disc.

[0015] (7) In (6), it is preferable that the valve element has a communication portion that communicates between both end faces of the valve element in the movement direction. With this configuration, paint in the paint flow path passes through the communication portion when the valve element moves between the closed position and the open position. Therefore, even if the gap between the outer peripheral surface of the valve element and the guide wall is narrowed to enhance the guiding function of the guide wall, it is possible to suppress the movement of the valve element from being hindered by flow resistance of the paint.

[0016] In (8) and (7), the communication portion preferably has a groove-like recess in the outer peripheral surface of the valve body. With this configuration, the communication portion communicates with the gap between the outer peripheral surface of the valve body and the guide wall. This reduces flow resistance when paint passes through the communication portion compared to when the communication portion is a through-hole that does not open to the outer peripheral surface of the valve body. This allows the valve body to move smoothly.

[0017] Example 1 A paint on-off valve according to a first embodiment of the present invention will be described below with reference to Figures 1 to 3. In the following description, the H direction in Figures 1 and 2 is defined as the upper side, and the R direction in Figures 1 and 2 is defined as the right side. The paint on-off valve of the present embodiment 1 is configured by assembling a valve body 10 made of a non-magnetic material, a valve element 20, and a piston 40. The valve body 10 is configured by assembling a main body 11, a guide member 31, and a fixing member 33.

[0018] A paint flow path 12 is formed in the lower end region of the main body 11. The paint flow path 12 is composed of a valve port 13, a primary chamber 14, and a secondary chamber 15. The valve port 13 is located midway along the paint flow path 12. In a plan view of the valve body 10 viewed from above, the valve port 13 opens in a circular shape. The primary chamber 14 is located below the valve port 13. The primary chamber 14 is an L-shaped bent path in a front view of the paint on-off valve viewed from the front. The upstream end of the primary chamber 14 opens on the right outer surface of the main body 11. The downstream end of the primary chamber 14 extends upward and communicates with the valve port 13. A paint pressure feed source (not shown) is connected to the upstream end of the primary chamber 14.

[0019] The secondary chamber 15 is disposed above the valve port 13. In a front view, the secondary chamber 15 is an L-shaped flow path. The secondary chamber 15 is composed of a driven-side working chamber 16 and an outflow path 17. The driven-side working chamber 16 is a circular space that is concentric with and communicates with the valve port 13 and constitutes the upstream region of the secondary chamber 15. The inner circumferential surface of the driven-side working chamber 16 functions as a guide wall 18 for guiding the valve element 20 that moves up and down. The outflow path 17 is a path that extends radially from the guide wall 18 and communicates with the driven-side working chamber 16. The downstream end of the outflow path 17 opens to the left outer surface of the main body 11 and constitutes the downstream end of the secondary chamber 15. The downstream end of the outflow path 17 is connected to a paint pressure-feed path (not shown) for supplying paint to a nozzle of a coating device.

[0020] A valve element 20 is housed in the driven-side working chamber 16 so that it can move up and down (in the axial direction of the valve port 13) between a closed position and an open position. The valve element 20 is a member that integrates a valve body 21 made of a non-magnetic material with a driven-side permanent magnet 25. The valve body 21 is a single component that has a guided portion 22 and a valve function portion 26.

[0021] The guided portion 22 is a circular portion as a whole in a plan view. The outer diameter of the guided portion 22 is slightly smaller than the inner diameter of the guide wall 18. The difference between the outer diameter of the guided portion 22 and the inner diameter of the guide wall 18 is set to a dimension necessary for the valve element 20 to move smoothly up and down within the driven-side working chamber 16. A plurality of communicating portions 23 are formed on the outer peripheral surface of the guided portion 22, spaced apart circumferentially. Each communicating portion 23 is groove-shaped and parallel to the movement direction (vertical direction) of the valve element 20, and faces closely to the guide wall 18. The upper and lower ends of each communicating portion 23 open to the upper and lower surfaces of the guided portion 22. The vertical space defined between the communicating portions 23 and the guide wall 18 functions as a flow path for the paint to flow as the valve element 20 moves up and down.

[0022] The guided portion 22 has a driven-side accommodating recess 24 formed by recessing the upper surface of the guided portion 22. A driven-side permanent magnet 25 is accommodated within the driven-side accommodating recess 24 and is fixed to the guided portion 22 with an adhesive or the like. The driven-side permanent magnet 25 is oriented so that one magnetic pole is located on the upper surface facing a driving-side permanent magnet 45 (described later), and the other magnetic pole is located on the lower surface facing the valve orifice 13 (the surface opposite the driving-side permanent magnet 45). The driven-side permanent magnet 25 constitutes a magnetically driven member that uses magnetic force to hold the valve element 20 in the closed position.

[0023] The valve function portion 26 is a portion that protrudes downward from the lower end surface of the guided portion 22. The valve function portion 26 has a truncated conical shape with a diameter that gradually decreases from the upper end to the lower end. The maximum outer diameter of the valve function portion 26 is smaller than the outer diameter of the guided portion 22 and larger than the inner diameter of the valve orifice 13. The minimum outer diameter of the valve function portion 26 is smaller than the inner diameter of the valve orifice 13.

[0024] When the tapered outer peripheral surface of the valve function portion 26 abuts against the inner peripheral surface of the valve orifice 13, the valve orifice 13 is closed, preventing paint from flowing between the primary chamber 14 and the secondary chamber 15. In the vertical movement path of the valve body 20, the position where the valve body 20 (valve function portion 26) closes the valve orifice 13 is defined as the closed valve position. When the valve function portion 26 moves away from the inner peripheral surface of the valve orifice 13, the valve orifice 13 is opened, allowing paint to flow between the primary chamber 14 and the secondary chamber 15. In the vertical movement path of the valve body 20, the position where the valve body 20 (valve function portion 26) moves upward from the valve orifice 13 to open it is defined as the open valve position.

[0025] An accommodation space 30 is formed in the main body 11 above the driven-side working chamber 16. The accommodation space 30 has a circular shape concentric with the driven-side working chamber 16 in a plan view and has a larger inner diameter than the driven-side working chamber 16. The lower end of the accommodation space 30 communicates with the upper end of the driven-side working chamber 16. A guide member 31 and a fixing member 33 are accommodated within the accommodation space 30. The lower surface of the guide member 31 abuts against the bottom surface of the accommodation space 30 while closing the opening at the upper end of the driven-side working chamber 16. A seal ring 32 provides an airtight seal between the lower surface of the guide member 31 and the bottom surface of the accommodation space 30. The fixing member 33 is disposed above the guide member 31. The fixing member 33 is screwed into a female thread portion 34 on the inner circumferential surface of the accommodation space 30, thereby fixing the guide member 31 to the accommodation space 30 (main body 11) while pressing the guide member 31 downward.

[0026] The guide member 31 defines a drive-side working chamber 35 that opens to the upper surface of the guide member 31. The drive-side working chamber 35 is comprised of a large-diameter chamber 36 and a small-diameter chamber 37. The large-diameter chamber 36 defines an upper end region of the drive-side working chamber 35. The upper end of the large-diameter chamber 36 is covered by the fixing member 33. The large-diameter chamber 36 has a circular shape concentric with the driven-side working chamber 16 in a plan view. The small-diameter chamber 37 is a space with a smaller inner diameter than the large-diameter chamber 36 and defines a lower end region of the drive-side working chamber 35. The upper end of the small-diameter chamber 37 communicates with the lower end of the large-diameter chamber 36. The large-diameter chamber 36 has a circular shape concentric with the large-diameter chamber 36 and the driven-side working chamber 16 in a plan view. The bottom wall of the guide member 31 functions as a partition wall 38 that airtightly separates the drive-side working chamber 35 (small-diameter chamber 37) from the driven-side working chamber 16.

[0027] A piston 40 is housed coaxially with the valve disc 20 within the drive-side working chamber 35. In the vertical direction, the piston 40 is disposed on the opposite side of the valve disc 20 from the valve orifice 13. The piston 40 is configured by integrally assembling a piston body 41 made of a non-magnetic material and a drive-side permanent magnet 45. The piston 40 (piston body 41) constitutes a magnetically driven member that holds the valve disc 20 in the valve-closed position by magnetic force.

[0028] The piston 40 is accommodated in the drive-side working chamber 35 so as to be able to move up and down. The movement direction of the piston 40 is parallel to the movement direction of the valve element 20 between the valve-closed position and the valve-open position. The piston body 41 is a single component having a large-diameter portion 42 accommodated in the large-diameter chamber 36 and a small-diameter portion 43 accommodated in the small-diameter chamber 37. The small-diameter portion 43 has a smaller outer diameter than the large-diameter portion 42 and protrudes downward from the lower end surface of the large-diameter portion 42. The space in the large-diameter chamber 36 below the large-diameter portion 42 functions as an air chamber 46.

[0029] The small diameter portion 43 has a drive-side accommodating recess 44 formed by recessing the lower surface of the small diameter portion 43. A drive-side permanent magnet 45 is accommodated within the drive-side accommodating recess 44 and is fixed to the small diameter portion 43 (piston body 41) with an adhesive or the like. The drive-side permanent magnet 45 is oriented so that one magnetic pole is located on the lower surface facing the driven-side permanent magnet 25, and the other magnetic pole is located on the upper surface opposite the driven-side permanent magnet 25. The drive-side permanent magnet 45 constitutes a magnetic drive member that uses magnetic force to hold the valve element 20 in the closed position.

[0030] The driving-side permanent magnet 45 and the driven-side permanent magnet 25 are arranged so that the same magnetic poles face each other in the vertical direction (a direction parallel to the movement direction of the valve body 20 between the valve-closed position and the valve-open position). Specifically, the north pole of the driving-side permanent magnet 45 and the north pole of the driven-side permanent magnet 25 face each other in the vertical direction, or the south pole of the driving-side permanent magnet 45 and the south pole of the driven-side permanent magnet 25 face each other in the vertical direction.

[0031] A valve-closing spring 47, which is a compression coil spring with its axis oriented in the vertical direction, is provided between the fixed member 33 and the piston 40. The valve-closing spring 47 constantly presses the piston 40 downward (in the valve-closing direction). An air supply passage 48 is formed in the valve body 10, penetrating the main body 11 and the guide member 31. The upstream end of the air supply passage 48 opens onto the left outer surface of the main body 11 and is connected to a compressed air source (not shown). The downstream end of the air supply passage 48 communicates with the air chamber 46.

[0032] When pressurized air is not supplied to the air chamber 46, the piston 40 descends due to the elastic force of the valve-closing spring 47 and is held in the valve-closing operating position (see FIG. 1). When pressurized air is supplied to the air chamber 46 through the air supply passage 48, the piston 40 ascends against the elastic force of the valve-closing spring 47 and is held in the valve-opening operating position where the piston 40 (large diameter portion 42) abuts against the fixed member 33.

[0033] Next, the operation of the paint on-off valve of this embodiment 1 will be described. The paint on-off valve is a normally closed valve, and when pressurized air is not supplied to the air chamber 46, the piston 40 is held in the valve closed operating position. When the piston 40 is in the valve closed operating position, the drive-side permanent magnet 45 is located close to the driven-side permanent magnet 25 of the valve body 20, so that the magnetic repulsive force between like magnetic poles of the drive-side permanent magnet 45 and the driven-side permanent magnet 25 moves the valve body 20 downward, closing the valve port 13. In other words, the paint on-off valve is held in a closed state.

[0034] In the closed valve state, the tip (lower end) of the valve function portion 26 of the valve element 20 protrudes into the primary chamber 14. In the primary chamber 14, the supply pressure applied to the paint acts on the valve function portion 26, and the valve element 20 is pressed in the valve opening direction by the paint pressure. However, the piston 40 is held in the valve closing operating position by the valve closing spring 47, and a pressing force in the valve closing direction acts on the valve element 20 due to the magnetic repulsive force generated between the driving-side permanent magnet 45 and the driven-side permanent magnet 25. Because this magnetic repulsive force in the valve closing direction is greater than the pressing force in the valve opening direction caused by the paint pressure, the valve element 20 is held in the closed valve position.

[0035] When paint is to be supplied to a nozzle (not shown) of a coating device, pressurized air is sent to the air chamber 46 to raise the piston 40 to the valve-open position. When the piston 40 rises, the driving-side permanent magnet 45 moves away from the driven-side permanent magnet 25, and the magnetic repulsive force between the driving-side permanent magnet 45 and the upward-moving-side permanent magnet decreases, so that the valve body 20 rises due to the pressure of the paint acting on the portion of the valve function portion 26 that protrudes into the primary chamber 14. This opens the valve port 13, and the paint on-off valve enters an open state.

[0036] When the pressure supply of pressurized air is stopped, the piston 40 moves downward due to the elastic force (bias) of the valve-closing spring 47, and the driving-side permanent magnet 45 approaches the driven-side permanent magnet 25. When the driving-side permanent magnet 45 approaches the driven-side permanent magnet 25, the magnetic repulsive force between the driving-side permanent magnet 45 and the driven-side permanent magnet 25 increases, so the valve element 20 descends to the valve-closed position, and the valve function portion 26 abuts against the valve port 13, thereby entering the valve-closed state.

[0037] The paint on-off valve of the first embodiment includes a paint flow passage 12 having a valve port 13, a valve element 20, and a magnetically driven member. The valve element 20 is housed within the paint flow passage 12 and is movable between an open position that opens the valve port 13 and a closed position that closes the valve port 13. The magnetically driven member uses magnetic force to hold the valve element 20 in the closed position. When the magnetic force is released, the magnetically driven member puts the valve element 20 in a state where it can be moved to the open position. This configuration eliminates the need for a penetrating member that penetrates from the interior of the paint flow passage 12 to the exterior of the paint flow passage 12, and therefore eliminates the need for a sealing member to seal between the interior and exterior of the paint flow passage 12. In other words, there are no components that can cause pigment to become trapped. Therefore, even if the paint contains pigment, the movement of the valve element 20 can be prevented from being hindered by the trapped pigment.

[0038] The magnetically driven member includes a driven-side permanent magnet 25 that moves integrally with the valve disc 20, a piston 40 that can move toward and away from the valve disc 20, and a drive-side permanent magnet 45. The drive-side permanent magnet 45 is provided to move integrally with the piston 40 and is arranged such that like poles face the driven-side permanent magnet 25. The valve disc 20 is held in the valve-closed position by the magnetic repulsion between the drive-side permanent magnet 45 and the driven-side permanent magnet 25. When the piston 40 moves away from the valve disc 20, the valve disc 20 can move to the valve-open position. With this configuration, the piston 40 is located on the opposite side of the valve disc 20 from the valve orifice 13, so the driven-side permanent magnet 25 can be located at the end of the valve disc 20 opposite the valve orifice 13. The end where the driven-side permanent magnet 25 is located is not subject to shape restrictions for abutting against the valve orifice 13, allowing for greater flexibility in determining the position and size of the driven-side permanent magnet 25.

[0039] The valve element 20 is arranged to open and close the valve orifice 13 from the secondary chamber 15 side, which is a flow path downstream of the valve orifice 13 in the paint flow path 12. The secondary chamber 15 is composed of a driven-side working chamber 16 for moving the valve element 20, and an outflow path 17. The outflow path 17 is a flow path that extends radially outward from the inner circumferential surface of the driven-side working chamber 16, intersecting the movement direction of the valve element 20. With this configuration, the drive-side working chamber 35, which is a space for moving the piston 40, can be arranged near the driven-side working chamber 16 of the valve element 20. Therefore, by arranging the drive-side permanent magnet 45 and the driven-side permanent magnet 25 close to each other, the magnetic repulsion force between the drive-side permanent magnet 45 and the driven-side permanent magnet 25 can be increased.

[0040] The piston 40 moves coaxially with the valve element 20 on an extension of the movement path of the valve element 20. With this configuration, the piston 40 can be made smaller in diameter (downsized) on a two-dimensional plane intersecting the movement direction of the valve element 20, compared to when the piston 40 moves in a direction intersecting the movement direction of the valve element 20.

[0041] The paint flow path 12 and the drive-side working chamber 35 for moving the piston 40 are separated by a partition wall 38. This configuration can prevent paint from adhering to the piston 40 and interfering with the movement of the piston 40.

[0042] The paint flow path 12 (driven-side working chamber 16) has a guide wall 18 that faces closely to the outer peripheral surface of the valve disc 20. With this configuration, even if the attitude or position of the valve disc 20 fluctuates during the movement of the valve disc 20, the valve disc 20 comes into sliding contact with the guide wall 18, thereby suppressing the amount of fluctuation in the attitude and position of the valve disc 20. Therefore, the valve port 13 can be reliably closed by the valve disc 20.

[0043] The valve element 20 is formed with a communication section 23 that provides communication between both the upper and lower end faces in the movement direction of the valve element 20. With this configuration, when the valve element 20 moves between the closed position and the open position, the paint in the paint flow path 12 passes through the communication section 23. Therefore, even if the gap between the outer peripheral surface of the valve element 20 and the guide wall 18 is narrowed to enhance the guiding function of the guide wall 18, it is possible to prevent the movement of the valve element 20 from being hindered by the flow resistance of the paint.

[0044] The communicating portion 23 has a groove-like recess in the outer peripheral surface of the valve body 20. With this configuration, the communicating portion 23 communicates with the gap between the outer peripheral surface of the valve body 20 and the guide wall 18, so that the flow resistance of the paint passing through the communicating portion 23 is reduced compared to when the communicating portion 23 is a through-hole that does not open to the outer peripheral surface of the valve body 20. This allows the valve body 20 to move smoothly.

[0045] <Other Examples> The present invention is not limited to the embodiments described above and illustrated in the drawings, and the following embodiments, for example, are also included within the technical scope of the present invention. The communication portion may be a through-hole that does not open to the outer peripheral surface of the valve body. The valve body may have a shape that does not have a communicating portion. The driven-side working chamber may have a shape that does not have a guide wall. The valve body may be formed of only the driven permanent magnet. The direction of movement of the piston may be a direction intersecting the direction of movement of the valve body. The paint flow path (secondary chamber) may be in communication with the driving side working chamber of the piston. The magnetically driven member may include an electromagnet located on the opposite side of the valve opening from the valve element, and a magnetic body attached to the valve element. In this case, the magnetic body attached to the valve element may be attached to a non-magnetic valve element, or may be the valve element itself. The valve element can be moved between the open and closed positions by energizing and deenergizing the electromagnet. The magnetically driven member may be composed of a driving-side permanent magnet arranged on the opposite side of the valve disc across the valve opening, and a driven-side permanent magnet attached to the valve disc with its opposite pole facing the driving-side permanent magnet. In this case, the valve disc is held in the closed position by the magnetic attractive force between the driving-side permanent magnet and the driven-side permanent magnet. When the driving-side permanent magnet is moved away from the valve disc, the magnetic attractive force weakens, and the valve disc is pushed in the open direction by the paint supply pressure. [Explanation of symbols]

[0046] 12...Paint flow path 13...valve opening 15…Secondary room 16...Driven side working chamber 17...Outflow channel 18...Guide wall 20...Valve body 23…Communication part 25...Driven permanent magnet (magnetic driving member) 35...Drive side working chamber 38...Partition wall 40...Piston (magnetic driving member) 45...Drive side permanent magnet (magnetic drive member)

Claims

1. a paint flow path having a valve port; a valve body accommodated in the paint flow path and movable between a valve open position at which the valve port is opened and a valve closed position at which the valve port is closed; a magnetically driven member that holds the valve element in the closed position by magnetic force and enables the valve element to move to the open position by releasing the magnetic force.

2. The magnetic driving member is a driven permanent magnet that moves integrally with the valve body; a piston that is movable toward and away from the valve body; a driving-side permanent magnet provided to move integrally with the piston and arranged such that like poles face each other with respect to the driven-side permanent magnet, The valve element is held at the valve closed position by a magnetic repulsive force between the driving-side permanent magnet and the driven-side permanent magnet, 2. A paint on-off valve according to claim 1, wherein the valve body can be moved to the valve open position by the piston moving in a direction away from the valve body.

3. the valve body is disposed so as to open and close the valve port from a secondary chamber side, which is a flow path downstream of the valve port in the paint flow path, 3. A paint on-off valve according to claim 2, wherein the secondary chamber is composed of a driven-side operating chamber for moving the valve element, and an outflow passage extending radially outward from the inner circumferential surface of the driven-side operating chamber and intersecting the direction of movement of the valve element.

4. 4. The paint on-off valve according to claim 3, wherein the piston moves coaxially with the valve body on an extension of the movement path of the valve body.

5. 5. A paint on-off valve according to claim 2, wherein the paint flow path and a drive-side working chamber for moving the piston are separated by a partition wall.

6. 5. The paint on-off valve according to claim 1, wherein the paint flow path has a guide wall that faces closely to an outer circumferential surface of the valve body.

7. 7. A paint on-off valve according to claim 6, wherein the valve body is formed with a communication portion that provides communication between both end faces of the valve body in the moving direction.

8. 8. The paint on-off valve according to claim 7, wherein the communication portion is formed by recessing an outer circumferential surface of the valve body into a groove shape.

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