JP3170118B2 - Gear pump device for painting - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating material which is disposed, for example, between a paint supply source and a coating machine and is suitable for supplying a coating material from the coating supply source to a coating machine at a predetermined flow rate. The present invention relates to a gear pump device.

[0002]

2. Description of the Related Art Generally, a gear pump, which is a metering pump, is used as a paint pump used in a coating apparatus. A flushable gear pump configured to reduce the time is known (for example, Japanese Patent Application Laid-Open No. 57-165885).

FIG. 8 to FIG. 14 show a conventional flashable gear pump as disclosed in Japanese Patent Laid-Open Publication No.
An example in which a gear pump having the same configuration as that described in JP-A-165885 is used in a paint supply device will be described.

In the drawing, reference numeral 1 denotes a color changing valve unit,
The color changing valve unit 1 includes a manifold 2 having a paint passage (not shown) therein, and an air source and a thinner source provided on the most upstream side of the manifold 2 through an air pipe 3A and a thinner pipe 4A. The air valve 3 and the thinner valve 4 were connected to each other (not shown), and the manifold 2 was provided on the downstream side of each of the valves 3 and 4, and the outlet was connected to the paint passage. A plurality of paint valves 5A, 5B,... 5M, 5
N (to be referred to as a paint valve 5 as a whole) and the valve opening degree which is provided at the most downstream side of the manifold 2 and is controlled in accordance with the control air pressure supplied from the control air pipe 6A, thereby controlling the paint pressure and the discharge amount. Air operated to control
And a pressure regulator 6 (hereinafter, referred to as AOPR6).

As the air valve 3, thinner valve 4, and paint valve 5, a spring return type 2-port 2-position switching valve of a pilot air type is used, and each valve is normally closed. Further, each of the paint valves 5A, 5B,.
M and 5N are paint pipes 7A, 7B,.
.. Are connected to paint tanks (all not shown) of colors A, B,.

Reference numeral 8 denotes a short connection pipe located at the downstream end of the manifold 2 and connected to a paint passage. The connection pipe 8 transfers paint and the like discharged from the paint passage to a flashable gear pump 11 described later. Supply.

Reference numeral 9 denotes a pump unit as a coating gear pump device provided downstream of the color changing valve unit 1. The pump unit 9 is fixed on a base (not shown) as shown in FIG. A drive motor 10 including a servo motor 10A, a speed reducer 10B, and the like;
It is generally constituted by a flushable gear pump 11 (hereinafter referred to as a gear pump 11) as a coating gear pump attached to the output side of the above and a valve assembly 32 described later.

The gear pump 11 comprises a casing 12, a driving gear 24, a driven gear 25, a driving shaft 26, a driven shaft 29, a seal assembly 31, and the like, which will be described later.

Reference numeral 12 denotes a casing which forms an outer shell of the gear pump 11, and the casing 12 is, as shown in FIG.
A cylindrical gear casing portion 13;
3 includes a front plate 14 as one side plate disposed on the left side in the drawing of FIG. 3 and a middle plate 15 as another side plate disposed on the right side of the gear casing 13. And
The casing 12 is provided with the front plate 14 and the middle plate 15 on both ends of the gear casing 13 by bolts 16, 16.
As a result, the gear chamber 17 is defined by closing both ends in the axial direction of a later-described housing hole 13A.

Here, the gear casing 13 includes:
As shown in FIG. 11, a substantially 8-shaped accommodation hole 13A for accommodating the driving gear 24 and the driven gear 25 in the meshed state is formed.
The suction part 13B and the discharge part 13C on the discharge side are formed to face each other. Further, the front plate portion 14 includes a drive shaft 2
6, support holes 14A and 14B for supporting the driven shaft 29 are formed to penetrate in the axial direction, and the gear casing 13
The communication passages 14C and 14D that communicate the suction portion 13B and the discharge portion 13C with the later-described bypass passages 33A and 33B of the manifold block 33 are formed so as to penetrate in the axial direction. Further, the middle plate portion 15 includes the front plate portion 14.
The support hole 15A rotatably supports the drive shaft 26 together with the support hole 14A, and the suction portion 13B and the discharge portion 13C, and constitutes the supply passage 18 and the discharge passage 19 together with the suction port 22 and the discharge port 23 described later. A suction hole 15B and a discharge hole 15C are formed.

The middle plate portion 15 communicates with the shaft hole portion 20A penetrating coaxially with the support hole 14B of the front plate portion 14, and the shaft hole portion 20A communicates with the support hole 15A of the middle plate portion 15. A communication passage 20 including a communication hole 20B is formed, and the communication passage 20 allows thinner to flow between thinner flow passages 28 and 30 described later.

Reference numeral 21 denotes a rear plate portion disposed on the right side of the middle plate portion 15 and constituting the casing 12 together with the gear casing portion 13, the front plate portion 14, and the middle plate portion 15. The rear plate portion 21 has An insertion hole 21A through which the drive shaft 26 is inserted is formed coaxially with the support hole 15A of the middle plate portion 15 and the like. Also,
As shown in FIG. 12, the rear plate portion 21 communicates with the suction hole 15B and the discharge hole 15C of the middle plate portion 15, and forms a part of the supply passage 18 and the discharge passage 19. Are formed.

Here, the suction port 22 and the discharge port 23 have communication portions 22A and 23A extending in the axial direction such that one end thereof communicates with the suction hole 15B and the discharge hole 15C.
And a suction port 22C and a discharge port 23C whose base ends are connected to the other ends of the communication portions 22A and 23A and whose front ends are opened to the outside via relay portions 22B and 23B extending in the width direction. The connection pipe 8 is connected to the suction port 22C, and the connection pipe 37 described later is connected to the discharge port 23C.

Reference numeral 24 denotes a drive gear rotatably disposed below the gear chamber 17, and reference numeral 25 denotes a driven gear which is located above the gear chamber 17 and meshes with the drive gear 24.
The gears 24 and 25 have outer gear teeth whose tip is the gear casing portion 1.
3 is in sliding contact with the accommodation hole 13A, and the side surface is in sliding contact with the end surfaces of the front plate portion 14 and the middle plate portion 15.

The left end 26 is rotatably supported by the support hole 14A of the front plate portion 14 and the support hole 15A of the middle plate portion 15 through the drive gear 24, and the right end side is projected outside the casing 12 to the drive motor 10. 2 shows a connected drive shaft, the drive shaft 26 being non-rotatably connected to the drive gear 24 via a key 27;

The drive shaft 26 has a flow port 28A open at the left end through the support hole 14A to the outside.
A thinner flow passage 28 is formed on the right end side as a cleaning fluid flow passage extending to the axial middle of the drive shaft 26. The thinner flow passage 28 is formed at the right end portion and the communication hole 2 of the communication passage 20.
Each of the intermediate portions that can communicate with OB is opened in the radial direction.

Reference numeral 29 denotes a support hole 14B of the front plate portion 14 on the left end side.
A driven shaft 30 rotatably supports the driven gear 25 on the right end side thereof by being inserted into the driven shaft 30. A thinner flow passage 30 is provided as a cleaning fluid flow passage provided so as to penetrate the driven shaft 29 in the axial direction. Respectively, and the thinner flow passage 30 is
The left end side is a circulation port 30A that opens to the outside, communicates with the shaft hole 20A of the communication passage 20 on the right end side, and opens toward the inner peripheral side of the driven gear 25 at the axial middle part.

The thinner flow passage 28 formed in the drive shaft 26 and the thinner flow passage 3 formed in the driven shaft 29
When the opening-side shaft cleaning valve 35 and the outlet-side shaft cleaning valve 36, which will be described later, are opened, the thinner flows.

Reference numeral 31 denotes a seal assembly provided at the right end of the rear plate 21 and provided on the outer periphery of the drive shaft 26. The seal assembly 31 includes first seal members 31A and 31A.
1A,... And the second seal members 31B, 31B,. The seal assembly 31 prevents thinner and paint in the gear chamber 17 from leaking to the outside.

Reference numeral 32 denotes a valve assembly mounted on the left end side of the gear pump 11. The valve assembly 32 has a manifold block 33 and a bypass valve 3, which will be described later, as shown in FIG.
4, the inlet-side shaft cleaning valve 35, the outlet-side shaft cleaning valve 36, and the like.

Reference numeral 33 denotes a rectangular parallelepiped manifold block fixed to the front plate portion 14. The manifold block 33 includes bypass passages 33A and 33B communicating with the communication passages 14C and 14D of the front plate portion 14, and a drive. A thinner supply passage 33C and a thinner discharge passage 33D communicating with the thinner flow passage 28 of the shaft 26 and the thinner flow passage 30 of the driven shaft 29 are provided.

Reference numeral 34 denotes the manifold block 33 shown in FIG.
A bypass valve protruding from the middle left side is shown. The bypass valve 34 includes an external pipe 34A, a bypass passage 33A,
The bypass passages 33A and 33B communicate with the communication passages 14C and 14D via 33B, and communicate with and block the bypass passages 33A and 33B in accordance with pilot air serving as signal air supplied via a joint 34B.

Reference numeral 35 denotes an inlet-side shaft cleaning valve provided on the right side of the manifold block 33, and reference numeral 36 denotes an outlet-side shaft cleaning valve provided on the lower side of the inlet-side shaft cleaning valve 35. The inlet side shaft cleaning valve 35 is connected to a thinner source via a joint 35A, and the outlet side shaft cleaning valve 36 is connected to a waste liquid tank (not shown) via a joint 36A. As the shaft cleaning valves 35, 36 and the bypass valve 34, a pilot air type spring return type 2-port 2-position switching valve is used, and each valve is normally closed. When the inlet side shaft cleaning valve 35 is opened, the thinner from the thinner source is supplied to the thinner flow passage 28 of the drive shaft 26. At this time, the outlet side shaft cleaning valve 36
In order to allow the supplied thinner to penetrate into each part, the valve is opened slightly after the opening of the inlet-side shaft cleaning valve 35, and the thinner that has been cleaned is discharged to the outside via the joint 36A.

The pump unit 9 configured as described above rotates the drive shaft 26 of the gear pump 11 by rotating the drive motor 10, and moves the driven gear 25 together with the drive gear 24 in the gear chamber 17. Drive rotationally. As a result, the paint supplied from the connection pipe 8 to the suction portion 13B of the gear casing portion 13 through the supply passage 18 including the suction port 22 and the suction hole 15B of the middle plate portion 15 transfers the paint to the rotating gears 24 and 25. Outer side and accommodation hole 13A
Are sequentially fed to the discharge section 13C side in a state of flowing into the discharge port 13C and the discharge port 15C and the discharge port 23 from the discharge section 13C.
Is discharged into the short connection pipe 37 at a predetermined flow rate through the discharge passage 19 formed of the liquid.

Reference numeral 38 denotes a cleaning valve unit provided on the discharge side of the gear pump 11. The cleaning valve unit 38 has a manifold 39 having a paint passage (not shown) inside.
And an air valve 40 and a thinner valve 41 provided upstream of the manifold 39 and connected to an air source and a thinner source via an air pipe 40A and a thinner pipe 41A.
And a dump valve 42 provided on the manifold 39 at a position downstream of the manifold 41. Here, as the dump valve 42, a spring return type 3 port 2 position switching valve of a pilot air type is used, and a connection pipe 37 is connected to an inflow side of the dump valve 42, and an inside of the manifold 39 is connected to each outflow side. The paint passage and the waste liquid tank 43 are connected to each other. The dump valve 42 supplies the paint and the like from the color changing valve unit 1 and the pump unit 9 to the manifold 39 when it is turned on, and discharges the previous color paint and thinner to the waste liquid tank 43 when it is turned off. is there.

Reference numeral 44 denotes a long connecting pipe located at the downstream end of the manifold 39 and connected to the paint passage. The connecting pipe 44 serves to paint paint and the like discharged from the paint passage, as will be described later. Is to be supplied to

Reference numeral 45 denotes a coating machine unit provided on the downstream side of the connection pipe 44. The coating machine unit 45 is located at the front end side, and has an atomizing head 46A for atomizing the paint and a paint of, for example, about -90 kV. And a rotary atomizing type electrostatic coating machine 46 provided with an electrode (not shown) for charging to a predetermined high voltage, and a manifold 47 provided with a paint or the like from a connection pipe 44 to the atomizing head 46A. A trigger valve 48 is provided in the manifold 47, and a dump valve 49 is provided in the manifold 47 and discharges residual paint, thinner, and the like at the time of washing that has flowed out of the washing valve unit 38 to the waste liquid tank 43. The coating machine unit 45 is maintained at the ground potential by charging the paint particles with electrodes while atomizing the paint supplied from the connection pipe 44 via the trigger valve 48 and the like by the atomizing head 46A. This is to fly and coat the object to be coated (not shown).

Here, the connection pipe 44 is long, and the color change valve unit 1, the pump unit 9,
The cleaning valve unit 38 and the like are disposed in a non-painting area 50 such as outside the coating booth away from the object to be coated, and the coating machine unit 45 and the like at the other end are located in the coating booth and near the object to be coated. In the painting area 51 of FIG.

The paint supply device according to the prior art has the above-described configuration. Next, the operation of the device will be described with reference to FIG.

First, when applying the A-color paint to the object to be coated, the dump valve 42 of the cleaning valve unit 38 is communicated with the manifold 39 to connect the connection pipes 37 and 44 and the pump unit 9 is connected. The bypass valve 34 is closed to connect the connection pipe 8 to the connection pipe 37 via the gear pump 11. And, the trigger valve 4 of the coating machine unit 45
8, the A color paint valve 5A of the color changing valve unit 1 is opened, and the drive motor 10 of the pump unit 9 is driven to rotate to drive the gear pump 11. Thus, the A-color paint flowing out of the A-color paint valve 5A reaches the gear pump 11 through the paint passage of the manifold 2 and the connection pipe 8, and the gear pump 11
Is supplied to the atomization head 46A of the coating machine 46 via the connection pipe 37, the dump valve 42, the manifold 39, the connection pipe 44, the manifold 47, and the trigger valve 48 at a predetermined flow rate, and is atomized by the atomization head 46A. To fly on the substrate.

Next, when the B color paint is applied to the object to be coated, the manifolds 2, 39, 47, the connection pipes 8, 37,
It is necessary to wash the A-color paint remaining in 44 etc.

Therefore, the A color paint valve 5A and the trigger valve 48 are closed, the dump valve 42 is opened, and the dump valve 42 is opened.
Is connected to the waste liquid tank 43, and the bypass valve 34 of the pump unit 9 is opened, so that the waste liquid tank 4 is discharged from the manifold 2 and the connection pipes 8 and 37 via the dump valve 42.
3, the manifold 39, the connection pipe 44,
A flow path from the manifold 47 to the waste liquid tank 43 via the dump valve 49 is formed.

Then, as described above, when the respective flow paths are secured, the air and thinner are supplied from the air valve 3 and thinner valve 4 of the color changing valve unit 1 and the air valve 40 and thinner valve 41 of the washing valve unit 38, respectively. Are alternately discharged. Thus, the manifold 2, the connection pipe 8, and the A in the gear pump 11 are
The color paint is washed and discharged from the dump valve 42 as waste liquid. Further, the A color paint remaining in the manifold 39, the connection pipe 44, and the manifold 47 is flushed from the dump valve 49 to the waste liquid tank 43 by the air and thinner from the cleaning valve unit 38, and is quickly cleaned. In the coating machine unit 45, when the thinner is finally discharged from the thinner valve 41, the thinner is closed by closing the dump valve 49 and opening the trigger valve 48.
6 to wash the atomizing head 46A and the like of the coating machine 46.

On the other hand, the manifold 2, the connection pipes 8, 37
Is completed, the bypass valve 34 is closed, and the air and thinner from the air valve 3 and the thinner valve 4 are circulated in the gear pump 11, and the gear chamber 17 in the gear pump 11, , 25 and the like. At this time, the inlet side shaft cleaning valve 35 and the outlet side shaft cleaning valve 36 are opened, and the air and thinner flowing from the inlet side shaft cleaning valve 35 are transferred from the thinner flow passage 28 of the drive shaft 26 to the middle plate portion 15. The thinner flow passage 30 of the driven shaft 29 through the formed communication passage 20
By flowing through the inside, the outer peripheral side of each of the shafts 26 and 29 is washed.

Next, when the cleaning of the paint supply device is completed in this way, the dump valve 42 is connected to the manifold 39 side, and the B color paint valve 5B of the color changing valve unit 1 is opened to open B
The color paint is supplied from the gear pump 11 to the connection pipe 37, the dump valve 42, the manifold 39, the connection pipe 44, and the manifold 47 side at a predetermined flow rate through the paint passage of the manifold 2 and the connection pipe 8. At this time, the dump valve 49 is used so that the B-color paint can be surely filled up to the coating machine 46.
Is opened to discharge the B-color paint into the waste liquid tank 43, and then the trigger valve 48 is opened and the atomizing head 46A of the coating machine 46 is opened.
B paint is supplied until the paint is filled (discharge spray). Then, when the preparation for the painting of the B color is completed, the painting of the B color is performed on the workpiece in the same manner as in the case of the A painting described above.

[0036]

In the above-described prior art, the bypass valve 34, the inlet side shaft cleaning valve 35, and the outlet side shaft cleaning valve 36 are provided so as to protrude from the manifold block 33. Valve assembly 3
2 becomes large.

Further, the bypass valve 34, the inlet side shaft cleaning valve 3
5, Joints 34B, 35A, 36A of the outlet side shaft cleaning valve 36
When connecting a pilot air pipe or thinner pipe (neither is shown) to the
Since the pipes are scattered around 4, 35, and 36, the pipe connection work is complicated, and there is a problem that workability at the time of assembly and maintenance is reduced.

The present invention has been made in view of the above-mentioned problems of the prior art, and has a bypass valve and a shaft cleaning valve housed in a manifold block so that a valve assembly can be downsized. It is an object to provide a gear pump device.

[0039]

In order to solve the above-mentioned problems, the feature of the construction of the coating gear pump device adopted by the present invention is that the gear pump is composed of a casing having a gear chamber defined therein, and a casing of the casing. A drive gear and a driven gear disposed in mesh with each other in a gear chamber, a drive shaft rotatably supported by the casing and connecting the drive gear to the drive motor, and the driven gear with respect to the casing. And a supply passage communicating with the gear chamber suction side in the casing and supplying the paint into the gear chamber, and communicating with the gear chamber discharge side in the casing and discharged from the gear chamber. A discharge passage for discharging paint to the outside of the casing; and a cleaning fluid flow passage formed in the drive shaft and the driven shaft to flow a cleaning fluid between the valve assembly and the valve assembly. A manifold block having a valve housing formed therein, a bypass passage provided in the manifold block and communicating with the supply passage and the discharge passage, and a valve housing provided in the middle of the bypass passage. A bypass valve that is provided in the section and communicates and shuts off a bypass passage by supplying and discharging signal air; a cleaning fluid supply and discharge passage that is provided in a manifold block so as to communicate with a cleaning fluid flow passage of the gear pump; A shaft cleaning valve is provided in the valve body accommodating portion, which is located in the middle of the cleaning fluid supply / discharge passage, and communicates and shuts off the cleaning fluid supply / discharge passage by supply / discharge of signal air.

The valve body accommodating portion of the manifold block is formed so as to open on the same surface of the manifold block, and the signal air connection ports of the bypass valve and the shaft cleaning valve accommodated in the valve body accommodating portion are the same. Preferably, it is arranged on the surface.

Further, the manifold block includes:
An intrinsically safe explosion-proof solenoid valve for supplying and discharging signal air to and from the bypass valve and the shaft cleaning valve for controlling the signal air may be provided integrally.

[0042]

According to the above construction, the bypass valve and the shaft cleaning valve are respectively housed in the valve body accommodating portions formed in the manifold block, and the bypass valves are provided in the valve body accommodating portion in accordance with the supply and discharge of the signal air. The shaft cleaning valve communicates with the cleaning fluid supply / discharge passage according to the supply and discharge of signal air.
Cut off.

Further, the valve body accommodating portion of the manifold block is formed so as to open on the same surface of the manifold block, and the signal air connection ports of the bypass valve and the shaft cleaning valve housed in the valve body accommodating portion are flush with each other. With this arrangement, the valve housing can be easily formed in the manifold block, and the signal air pipe can be easily connected to the signal air connection port.

Further, by using the intrinsically safe explosion-proof solenoid valve, the intrinsically safe explosion-proof solenoid valve can be arranged near the bypass valve and the shaft washing valve, and the signals supplied to and discharged from the bypass valve and the shaft washing valve are provided. Responsiveness can be improved by shortening the air flow path.

[0045]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In the embodiment, the same components as those of the prior art shown in FIGS. 8 to 14 are denoted by the same reference numerals, and description thereof will be omitted.

First, FIGS. 1 to 4 show a first embodiment of the present invention.

In the figure, reference numeral 61 denotes a valve assembly according to the present embodiment mounted on the left end side of the gear pump 11. The valve assembly 61 includes a manifold block 62, a bypass valve 66, and an inlet-side shaft cleaning valve 67, which will be described later. , The outlet side shaft cleaning valve 68 and the like.

Reference numeral 62 denotes a manifold block which forms the outer shell of the valve assembly 61, and 63 denotes a block main body which forms the manifold block 62 together with a passage plate 64 which will be described later. As shown in FIG. A bypass valve accommodating portion 63A serving as a valve body accommodating portion, which is located on the right side and into which the bypass valve 66 is inserted, and an inlet-side shaft washing valve 67 and an outlet-side shaft washing valve 68 located on the left side are inserted. Washing valve housing portions 63B and 63C as valve body housing portions are formed so as to penetrate upward and downward. As shown in FIG. 3, the block main body 63 has a bypass valve housing 63.
A, 63B, paint connection ports 63D, 63E connected to communication passages 14C, 14D formed in the front plate portion 14 of the gear pump 11, and thinner flow passages 28 formed in the drive shaft 26. Thinner flow passage 3 formed in shaft 29
The thinner connection ports 63F and 63G are connected to the lower end of the bypass valve accommodating section 63A via a bypass passage 63H.

Reference numeral 64 denotes a passage plate attached to the lower end of the block body 63. The passage plate 64 includes a bypass passage 64A for connecting the bypass valve housing 63A and the paint connection port 63D, and a washing valve housing. 63B and thinner connection port 6
3F, a thinner supply passage 64B as a cleaning fluid supply / discharge passage, a cleaning valve housing 63C, and a thinner connection port 6.
The cleaning fluid supply / discharge passage connecting the 3G and the thinner discharge passage 64C is formed so as not to interfere with each other.

Also, 65, 65,...
A valve seat member which is inserted into a lower end side opening of each of the housing portions 63A, 63B, 63C, and a valve for separating and seating a valve body 71 on the inner peripheral side of each of the valve seat members 65. A seat 65A is formed.

Reference numeral 66 denotes a bypass valve inserted into the bypass valve receiving portion 63A of the block body 63, 67 denotes an inlet-side shaft cleaning valve inserted into the cleaning valve receiving portion 63B, and 68
Indicates an outlet-side shaft cleaning valve inserted into the cleaning valve housing 63C, and the valves 66, 67, and 68 are a retainer 69, a valve body 71, an air passage 72, a cover 73, and a valve spring 75 described later. And so on. In addition, each valve 66,
Since the configurations of 67 and 68 have the same configuration, the description of the inlet side shaft cleaning valve 67 will be omitted and the description of the bypass valve 66 and the outlet side shaft cleaning valve 68 will be omitted.

Referring to FIG. 4, the inlet side shaft cleaning valve 67 will be described.
B shows a stepped cylindrical retainer provided on the lower side, and the retainer 69 is inserted and fitted together with a ring seal 70 and the like, and a valve body 71 is inserted through its inner peripheral side so as to be displaceable in the axial direction. .

Reference numeral 71 denotes a valve body slidably provided in the cleaning valve housing portion 63B in the axial direction. The valve body 71 is inserted downward into the retainer 69 at its distal end, and extends downward. The piston 7 is inserted into a cover 73 provided on the upper end side of the cleaning valve housing portion 63B, and a piston 7 that defines the inside of the cleaning valve housing portion 63B into upper and lower air chambers A and B at an intermediate portion.
1A is formed so as to protrude in the radial direction. Further, an air passage 72 is formed in the valve body 71, an upper end side of the air passage 72 opens at an upper end surface of the valve body 71, and a lower end side of the piston 7
1A, that is, open to the air chamber B.

Reference numeral 73 denotes a stepped cylindrical cover which is screwed to cover the upper end side opening of the washing valve housing 63B, and a connection port 74 projecting upward is provided on the upper surface side of the cover 73.
Are formed integrally, and a pilot air pipe 78 described later for supplying pilot air as signal air is connected to the connection port 74.

Reference numeral 75 denotes a valve spring provided between the piston 71A of the valve body 71 and the cover 73, and the valve spring 75 constantly biases the valve body 71 in the valve closing direction.

Reference numeral 76 denotes a thinner inflow connection port having a joint 76A formed in the block main body 63 so as to communicate with the lower side of the cleaning valve accommodating portion 63B. The thinner inflow connection port 76 is connected to a thinner source. ing. Also, 77
Is a thinner outflow connection port for flowing out thinner from the outlet side shaft cleaning valve 68, and the thinner outflow connection port 77 is connected to a waste liquid tank via a joint (not shown).

When pilot air is supplied to the inlet side shaft cleaning valve 67 via a pilot air pipe 78 serving as a signal air pipe connected to the connection port 74, the pilot air is supplied through an air passage 72. By flowing into the air chamber B and displacing the valve body 71 in the valve opening direction against the urging force of the valve spring 75 by the pressure of the pilot air, cleaning is performed from the thinner source via the thinner inflow connection port 76 and the like. The thinner flowing into the valve housing 63B is supplied from the thinner supply passage 64B to the thinner flow passage 28 formed in the drive shaft 26 via the thinner connection port 63F. When the outlet side shaft cleaning valve 68 is opened, the thinner discharged from the thinner flow passage 30 of the driven shaft 29 is drained through the thinner connection port 63G, the thinner discharge passage 64C, and the thinner outflow connection port 77. Drain into tank. On the other hand, when the shaft wash valves 67 and 68 are closed, the flow of thinner is cut off.

Further, when the bypass valve 66 is opened by the supply of the pilot air, the paint or the like flowing into the supply passage 18 of the gear pump 11 from the connection pipe 8 is supplied to the front plate portion 14.
Through the communication passage 14C and the paint connection port 63D into the bypass valve accommodating portion 63A, and the paint or the like flows through the bypass passage 64A, the paint connection port 63E, and the communication passage 14D.
And vigorously circulate to the discharge passage 19 side. on the other hand,
When the pilot air is not supplied, the valve spring 7
By closing the valve body 71 with the urging force of 5,
The paint or the like flowing from the supply passage 18 is discharged by the gears 24 and 25 at a predetermined flow rate to the discharge passage 19 side.

On the other hand, in the valve assembly 61 described above, the bypass valve 66 and the inlet shaft cleaning are formed by forming the respective receiving portions 63A, 63B and 63C of the block main body 63 so as to open on the same surface (upper surface). Valve 67, outlet side shaft cleaning valve 68
The workability when assembling with the housing portions 63A, 63B, 63C is improved.

The valve assembly 61 according to the present embodiment has the above-described configuration.
There is no particular difference from the valve assembly 32 according to the prior art described based on FIG.

According to this embodiment, however, the bypass valve housing 63A and the cleaning valve housings 63B and 63C are formed in the single block body 63 constituting the manifold block 62, and the housings 63A, 63B and 63C are formed. Since the bypass body 66, the inlet-side shaft washing valve 67, and the outlet-side shaft washing valve 68 are housed therein, the block body 63 is connected to each valve 6
6, 67, 68 can be used as a casing,
By preventing each valve 66, 67, 68 from protruding outside,
The valve assembly 61 can be reduced in size.

The housings 63A, 63B and 63C are formed in the block body 63 of the valve assembly 61 so as to open on the same surface (upper end surface).
The boring processability for forming 63B, 63C can be improved, and a bypass valve 66, an inlet-side shaft cleaning valve 67, and an outlet-side shaft cleaning valve 68 for each of the storage portions 63A, 63B, 63C are provided.
Can be improved.

Further, the connection ports 74 of the bypass valve 66, the inlet side shaft cleaning valve 67, and the outlet side shaft cleaning valve 68 are connected to the upper end surface of the block body 63, and the thinner inflow connection port 76,
Since the thinner outflow connection port 77 is arranged neatly in front of the block body 63, each pilot air pipe 78 and thinner pipe can be easily connected,
The workability at the time of pipe connection work is improved, and the workability at the time of assembly and maintenance can be greatly improved. Also,
Each pilot air pipe 78 and the like can be linearly connected to each connection port 74 and the like, so that an ideal pipe arrangement with less flow resistance can be obtained.

FIGS. 5 to 7 show a second embodiment of the present invention. This embodiment is characterized in that an intrinsically safe explosion-proof solenoid valve is used for a bypass valve, an inlet-side shaft cleaning valve, and an outlet-side shaft cleaning. That is, the pilot air to the valve was controlled. In the embodiment, the same components as those in the first embodiment shown in FIGS. 1 to 4 are denoted by the same reference numerals, and description thereof will be omitted.

In the figure, reference numeral 81 denotes a valve assembly according to the present embodiment mounted on the left end side of the gear pump 11, and the valve assembly 81 is substantially the same as the valve assembly 61 described in the first embodiment. However, the difference is that an intrinsically safe explosion-proof solenoid valve 83, which will be described later, is mounted on the bypass valve 66, the inlet side shaft cleaning valve 67, and the outlet side shaft cleaning valve 68, respectively.

Are covers screwed to cover the upper ends of the valve housings 63A, 63B, 63C of the block body 63, and 83, 83,.
6 shows an intrinsically safe explosion-proof solenoid valve (hereinafter referred to as an intrinsically safe solenoid valve 83) integrally mounted on the block body 63 at the upper end side of the block, as shown in FIG.
Valve casing 84, coil 91, plunger 9 described later
3, a normally closed 3-port 2-position direct-acting solenoid valve comprising a flapper 96 and the like.

Reference numeral 84 denotes a valve casing constituting the outer shell of the intrinsically safe solenoid valve 83. As shown in FIG. 7, the valve casing 84 has a flange portion 84A which is located at the lower end and fixed to the block main body 63. A casing body 84B disposed above the flange portion 84A;
B, and a solenoid casing 84C disposed above B.

Reference numeral 85 denotes an air supply port provided in the casing main body 84B of the valve casing 84, and reference numeral 86 denotes an exhaust port provided below the air supply port 85 and provided in the casing main body 84B. One end of the port 85 and the exhaust port 86 serves as an air supply port 85A and an exhaust port 86A that extend and open into the casing body 84B, and the other end opens on the outer peripheral surface of the casing body 84B. And
The air supply port 85 is connected to a pressure source via an air pipe (not shown).

Reference numeral 87 denotes a valve chamber formed in the casing body 84B of the valve casing 84, and 88 denotes a supply / discharge port provided below the valve chamber 87 and provided at the center of the flange portion 84A. The supply / discharge port 88 has an upper end opening into and communicating with the valve chamber 87, and a lower end opening into the cover 82 of the valve assembly 81 and communicating with the air passage 72.

Reference numeral 89 denotes a solenoid provided in a solenoid casing 84C of the valve casing 84. The solenoid 89 includes a coil bobbin 90 and a coil bobbin 9
0, a resin-molded coil 91, a column 92 fitted on the inner peripheral side of the upper end of the coil bobbin 90 and formed in a substantially cylindrical shape from electromagnetic stainless steel or the like.
2 and a plunger 93 inserted through the coil bobbin 90 and made of electromagnetic stainless steel or the like.

The plunger 93 is constantly urged downward by a plunger spring 94 as a valve spring, and a disc body 95 made of synthetic rubber or the like is provided on the lower surface thereof. . And the plunger 93
When the coil 91 is not energized, it is urged by the plunger spring 94 to be displaced downward to seat the valve body 95 in the air supply port 85A of the air supply port 85 while being attracted to the column 92 when the coil 91 is energized. Displaced upward, and the valve 9
5 is separated from the air supply port 85A.

Reference numeral 96 denotes a flapper, which is provided between the exhaust port 86A of the exhaust port 86 and the supply / discharge port 88 and is provided in the valve chamber 87 and is a second valve body made of a synthetic rubber or the like in a disk shape. The flapper 96 is fixed to the lower surface side of the plunger 93 via a plurality of pins 97 (only one is shown), and is constantly urged upward by a flapper spring 98. The flapper 96 is displaced downward together with the plunger 93 when the coil 91 is not energized, and
6, while the coil 91 is energized, it displaces upward together with the plunger 93 and sits on the exhaust port 86A.

The valve assembly 81 according to this embodiment has the above-described configuration. Next, the operation of the bypass valve 66 by the safety solenoid valve 83 will be described.

First, when the energization of the coil 91 of the intrinsically safe solenoid valve 83 is stopped and the plunger 93 is displaced downward by being urged by the plunger spring 94, the valve body 95 is moved to the supply port 85 A of the supply port 85. And sit on the flapper 9
6 is separated from the exhaust port 86A of the exhaust port 86.

Thus, the lower air chamber B and the exhaust port 86
Are communicated through the air passage 72, the supply / discharge port 88, and the valve chamber 87, and the pilot air in the air chamber B is exhausted from the exhaust port 86, and the pressure is reduced. Therefore, the valve element 71 of the bypass valve 66 is urged by the valve spring 75 to be displaced downward,
The user sits on the valve seat 65A of the valve seat member 65 and closes the valve.

Next, when the coil 91 of the intrinsically safe solenoid valve 83 is energized and the plunger 93 is attracted by the column 92 and is displaced upward, the valve body 95 is moved to the air supply port 85A of the air supply port 85.
And the flapper 96 is seated on the exhaust port 86A of the exhaust port 86.

As a result, the pilot air from the air pipe flows into the valve chamber 87 from the air supply port 85 and is supplied from the valve chamber 87 to the air chamber B via the supply / discharge port 88 and the air passage 72. The valve body 71 of the bypass valve 66 is displaced upward against the spring force of the valve spring 75 by the pressure of the pilot air to open.

Thus, according to the present embodiment, three intrinsically safe solenoid valves 83 are mounted on the manifold block 62, and each of the intrinsically safe solenoid valves 83 includes the bypass valve 66 and the inlet side shaft cleaning valve 6.
7. Since the pilot air to the outlet side shaft cleaning valve 68 is individually controlled, the flow path through which the pilot air flows can be greatly reduced, and the occurrence of a reaction delay during operation is effectively prevented. In addition, responsiveness can be greatly improved.

In each of the above embodiments, the valve assembly 61,
It has been described that the 81 has three valve elements of a bypass valve 66, an inlet-side shaft cleaning valve 67, and an outlet-side shaft cleaning valve 68. However, the present invention is not limited to this, and for example, the outlet-side shaft cleaning valve 68 is provided.
And the supply of thinner may be controlled only by the inlet side shaft cleaning valve 67. On the other hand, a throttle valve and the like are added to the bypass valve 66, the inlet side shaft cleaning valve 67, and the outlet side shaft cleaning valve 68. Four or more valve bodies may be provided.

Further, in each of the above embodiments, the case where cleaning is performed using thinner has been described as an example. However, in the case of a water-based paint, water can be used as the cleaning liquid.

Furthermore, in each of the above embodiments, the case where the flashable gear pump 11 supplies paint to the rotary atomizing type electrostatic coating machine 46 has been described as an example. It may be used to supply a coating material to another coating machine such as a coating machine or an air atomization type coating machine.

[0082]

As described above in detail, according to the present invention, a valve assembly is provided in a manifold block having a valve body accommodating portion formed therein, and the supply passage and the discharge passage are provided in the manifold block. A bypass passage communicating with the valve, a bypass valve provided in the valve housing at a position in the middle of the bypass passage, and communicating and blocking the bypass passage by supply and discharge of signal air; and a cleaning fluid flow passage of the gear pump. A cleaning fluid supply / discharge passage provided in the manifold block so as to communicate with the valve; and a cleaning fluid supply / discharge passage provided in the valve body accommodating position in the cleaning fluid supply / discharge passage. Since the exhaust passage consists of a shaft wash valve that communicates and shuts off, the manifold block
The valve assembly can be used as a casing of a shaft washing valve, preventing each valve body from projecting from the manifold block as in the prior art, and reducing the size of the valve assembly.

Further, the valve body accommodating portion of the manifold block is formed so as to open on the same surface of the manifold block, and the signal air connection ports of the bypass valve and the shaft cleaning valve housed in the valve body accommodating portion are flush with each other. The valve body accommodating part can be easily formed in the manifold block, and the processability can be improved. In addition, the bypass valve and the shaft cleaning valve can be easily assembled, and the signal air piping is connected to the connection port. Workability such as work can be improved.

Further, by using the intrinsically safe explosion-proof solenoid valve to operate the bypass valve and the shaft cleaning valve, in addition to the effects of the above-described invention, a signal for controlling the bypass valve and the shaft cleaning valve is provided. The air circulation distance can be shortened, and a response delay due to the air can be prevented to improve the responsiveness.

[Brief description of the drawings]

FIG. 1 is an external view showing a state in which a valve assembly according to a first embodiment of the present invention is assembled to a pump unit.

FIG. 2 is an enlarged vertical sectional view showing the internal structure of the valve assembly as viewed from the direction of arrows II-II in FIG.

FIG. 3 is a view showing each accommodating portion and each connection port of the block main body.
It is the cross-sectional view seen from the arrow III-III direction in the middle.

FIG. 4 is an enlarged cross-sectional view as viewed from a direction indicated by arrows IV-IV in FIG. 2;

FIG. 5 is an external view showing a state where a valve assembly according to a second embodiment of the present invention is assembled to a pump unit.

FIG. 6 is an enlarged vertical sectional view of the internal structure of the valve assembly as seen from the direction of arrows VI-VI in FIG.

FIG. 7 is an enlarged sectional view seen from the direction of arrows VII-VII in FIG. 6;

FIG. 8 is an overall configuration diagram showing a paint supply device using a valve assembly according to the related art.

FIG. 9 is an external view of the pump unit shown in FIG.

FIG. 10 is a longitudinal sectional view of the flashable gear pump shown in FIG. 9;

11 is a cross-sectional view showing a state in which a driving gear and a driven gear are housed in a housing hole of a gear casing, as viewed from the direction indicated by arrows XI-XI in FIG. 10;

FIG. 12 shows the relationship between the supply passage and the discharge passage and the suction portion and the discharge portion of the gear casing, as indicated by arrows XII-XII in FIG.
It is a direction sectional view.

FIG. 13 is an enlarged front view showing the valve assembly in FIG. 9;

FIG. 14 is a time chart showing an operation state of the paint supply device.

[Explanation of symbols]

 Reference Signs List 9 pump unit (coating gear pump device) 10 drive motor 11 flashable gear pump 12 casing 13 gear casing part 14 front plate part 15 middle plate part 17 gear chamber 18 supply passage 19 discharge passage 24 drive gear 25 driven gear 26 drive shaft 28, 30 Thinner flow passage (cleaning fluid flow passage) 29 Followed shaft 61, 81 Valve assembly 62 Manifold block 63 Block main body 63A Bypass valve housing (valve housing) 63B, 63C Cleaning valve housing (valve housing) 63D , 63E paint connection port 63F, 63G thinner connection port 63H bypass passage 64 passage plate 64A bypass passage 64B thinner supply passage (washing fluid supply / discharge passage) 64C thinner discharge passage (washing fluid supply / discharge passage) 66 bypass valve 67 inlet side Shaft wash valve 68 Outlet side shaft wash valve 74 Connection Port 78 Pilot air piping (signal air piping) 83 Intrinsically safe explosion-proof solenoid valve

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B05B 7 / 24,15 / 00 B05C 11/10 F04C 2 / 10,15 / 00

Claims (3)

(57) [Claims] 1. A coating gear pump device comprising a gear pump, a drive motor for driving the gear pump, and a valve assembly attached to the gear pump, wherein the gear pump has a casing defining a gear chamber therein; A drive gear and a driven gear disposed to mesh with each other in a gear chamber of the casing; a drive shaft rotatably supported by the casing and connecting the drive gear to the drive motor; A driven shaft that supports the driven gear, and communicates with a gear chamber suction side in the casing;
A supply passage for supplying the paint into the gear chamber, a discharge passage communicating with the discharge side of the gear chamber in the casing, and discharging the paint discharged from the gear chamber to the outside of the casing, the drive shaft and the driven shaft. A cleaning fluid flow passage for allowing a cleaning fluid to flow between the valve assembly and the valve assembly, wherein the valve assembly includes a manifold block having a valve body housing formed therein, and a manifold block formed in the manifold block. A bypass passage communicating with the supply passage and the discharge passage; and a bypass passage provided in the valve body accommodating portion at an intermediate position of the bypass passage.
A bypass valve for communicating and shutting off a bypass passage by supplying and discharging signal air; a cleaning fluid supply / discharge passage provided in a manifold block so as to communicate with a cleaning fluid flow passage of the gear pump; And a shaft cleaning valve provided in the valve body accommodating portion at a midway of the shaft and communicating and blocking a cleaning fluid supply / discharge passage by supply / discharge of signal air. 2. A valve body accommodating portion of the manifold block is formed so as to open on the same surface of the manifold block, and a signal air connection port of a bypass valve and a shaft cleaning valve housed in the valve body accommodating portion are the same. The coating gear pump device according to claim 1, wherein the gear pump device is arranged on a surface. 3. An intrinsically safe explosion-proof solenoid valve for signal air control for supplying and discharging signal air to the bypass valve and the shaft cleaning valve, respectively, is integrally provided in the manifold block. 3. The coating gear pump device according to item 2.