JPH0780366A - Gear pump device for coating - Google Patents

Abstract

PURPOSE:To miniaturize a valve assembly by housing a bypass valve and a shaft washing valve in a manifold block. CONSTITUTION:This gear pump device is constituted such that a bypass valve housing part 63A and washing valve housing parts 63B, 63C are formed in a block main body 63 of the manifold block 62, and a bypass valve 66, an inlet side shaft washing valve 67 and an outlet side shaft washing valve 68 are held in the housing parts 63A, 63B, 63C. Thus, the block main body 63 is used as a casing of each of the valves 66, 67, 68 and the valve assembly 61 is miniaturized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is suitable for coating, for example, which is arranged between a paint supply source and a coating machine and is used to supply the paint from the paint supply source to the 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. When the color changing cleaning is performed, the flow rate of the cleaning fluid such as air and thinner is increased to perform cleaning. A flashable gear pump configured to shorten the time is known (for example, Japanese Patent Application Laid-Open No. 57-165685).

Therefore, a flashable gear pump according to the prior art is shown in FIGS.
A case where a gear pump having a structure similar to that shown in Japanese Patent Laid-Open No. 165685 is used in a paint supply device will be described as an example.

In the figure, 1 is a color change valve unit,
The color change valve unit 1 is provided on a manifold 2 whose interior is a paint passage (not shown), and is provided on the most upstream side of the manifold 2, and has an air source and a thinner source via an air pipe 3A and a thinner pipe 4A. An air valve 3 and a thinner valve 4 connected to each (not shown), a manifold 2 located on the downstream side of the valves 3 and 4, and outlets connected to the paint passages, respectively. Multiple paint valves 5A, 5B, ... 5M, 5
N (collectively referred to as paint valve 5) and the paint pressure and discharge amount by adjusting the valve opening degree according to the control air pressure provided from the control air pipe 6A provided on the most downstream side of the manifold 2. Air operated controlling
It is composed of a pressure regulator 6 (hereinafter referred to as AOPR 6).

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

Reference numeral 8 denotes a short connecting pipe located at the downstream end of the manifold 2 and connected to the paint passage. The connecting pipe 8 transfers paint or the like discharged from the paint passage to a flushable gear pump 11 described later. To supply.

Reference numeral 9 denotes a pump unit as a coating gear pump device provided on the downstream side of the color change 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 and a speed reducer 10B, and the drive motor 10
A flash 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 are roughly configured.

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

Reference numeral 12 denotes a casing forming an outer shell of the gear pump 11, and the casing 12 has a structure as shown in FIG.
Cylindrical gear casing portion 13 and the gear casing portion 1
3, a front plate portion 14 as one side plate portion disposed on the left side in the figure and an intermediate plate portion 15 as the other side plate portion disposed on the right side of the gear casing portion 13 are generally configured. Is
The casing 12 has the front plate portion 14 and the middle plate portion 15 at both ends of the gear casing portion 13 with bolts 16, 16 respectively.
The gear chamber 17 is defined by closing both ends in the axial direction of the accommodation hole 13A, which will be described later, by tightening.

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

Further, the intermediate plate portion 15 has a shaft hole portion 20A penetrating the support hole 14B of the front plate portion 14 coaxially therewith, and the shaft hole portion 20A and the support hole 15A of the middle plate portion 15 communicate with each other. A communication passage 20 including a communication hole portion 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 which is arranged on the right side of the middle plate portion 15 and constitutes the casing 12 together with the gear casing portion 13, the front plate portion 14 and the middle plate portion 15, and the rear plate portion 21 includes: 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, and the suction port 22 and the discharge port 23. Are formed.

Here, the suction port 22 and the discharge port 23 have axially extending communication portions 22A and 23A so that one ends thereof communicate with the suction hole 15B and the discharge hole 15C.
And a proximal end side is connected to the other end side of the communication portions 22A and 23A, and a distal end side is substantially L-shaped from a suction port 22C and a discharge port 23C that are open to the outside via relay portions 22B and 23B that extend 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 positioned above the gear chamber 17 and meshed with the drive gear 24.
The gears 24 and 25 have tooth tips on the outer periphery of the gear casing portion 1
The sliding surface is in sliding contact with the housing hole 13A of No. 3, and the side surfaces are in sliding contact with the end surfaces of the front plate portion 14 and the middle plate portion 15.

A left end side of the drive shaft 26 penetrates the drive gear 24 and is rotatably supported in the support hole 14A of the front plate portion 14 and the support hole 15A of the middle plate portion 15, and the right end side thereof projects to the outside of the casing 12 and is connected to the drive motor 10. A connected drive shaft is shown, and the drive shaft 26 is non-rotatably connected to the drive gear 24 via a key 27.

The left end of the drive shaft 26 serves as a flow port 28A opened to the outside through the support hole 14A.
A thinner flow passage 28 is formed as a cleaning fluid flow passage whose right end extends to an axial center of the drive shaft 26. The thinner flow passage 28 has a communication hole portion 2 of the right end and the communication passage 20.
Each of the intermediate portions that can communicate with 0B is opened in the radial direction.

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

Here, a thinner flow passage 28 formed in the drive shaft 26 and a thinner flow passage 3 formed in the driven shaft 29.
It is in communication with 0 through the communication passage 20, and the thinner flows when the inlet side shaft cleaning valve 35 and the outlet side shaft cleaning valve 36 described later are opened.

Reference numeral 31 designates a seal portion assembly which is located on the right end side of the rear plate portion 21 and is provided on the outer peripheral side of the drive shaft 26. The seal portion assembly 31 includes the first seal members 31A and 3A.
1A, ... And the second seal members 31B, 31B ,. The seal portion assembly 31 prevents the thinner and paint in the gear chamber 17 and the like 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 is, as shown in FIG. 13, a manifold block 33 and a bypass valve 3 which will be described later.
4, an inlet side shaft cleaning valve 35, an 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, and the manifold block 33 has bypass passages 33A and 33B communicating with the respective communication passages 14C and 14D of the front plate portion 14 and driving. A thinner flow passage 28 of the shaft 26, a thinner supply passage 33C communicating with a thinner flow passage 30 of the driven shaft 29, and a thinner discharge passage 33D are provided.

Reference numeral 34 shows the manifold block 33 in FIG.
The bypass valve provided so as to project to the left side in the middle is shown. The bypass valve 34 includes an external pipe 34A, a bypass passage 33A,
It communicates with the communication passages 14C and 14D via 33B, and connects and disconnects the bypass passages 33A and 33B according to pilot air as signal air supplied via the joint 34B.

Reference numeral 35 denotes an inlet side shaft cleaning valve provided so as to project to the right side of the manifold block 33, and 36 denotes an outlet side shaft cleaning valve provided so as to protrude below 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. Further, as the shaft cleaning valves 35, 36 and the bypass valve 34, a pilot air type spring return type two-port two-position switching valve is used and is normally closed. Then, 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, and at this time, the outlet side shaft cleaning valve 36 is
In order to allow the supplied thinner to permeate into each part, the inlet side shaft cleaning valve 35 is opened after a slight delay, and the cleaned thinner is discharged to the outside through the joint 36A.

The pump unit 9 constructed as described above rotationally drives the drive motor 10 to rotationally drive the drive shaft 26 of the gear pump 11, and the driven gear 25 together with the drive gear 24 in the gear chamber 17. Drive to rotate. 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 formed of the suction port 22 and the suction hole 15B of the intermediate plate portion 15 is applied to the rotating gears 24 and 25. Outer peripheral side and accommodation hole 13A
And the discharge port 15C and the discharge port 23 from the discharge portion 13C.
A predetermined flow rate is discharged into the short connecting pipe 37 through the discharge passage 19 composed of.

Reference numeral 38 denotes a cleaning valve unit provided on the discharge side of the gear pump 11, and the cleaning valve unit 38 has a manifold 39 having a paint passage (not shown) therein.
An air source provided on the upstream side of the manifold 39 via an air pipe 40A and a thinner pipe 41A, an air valve 40 connected to the thinner source, a thinner valve 41, and the respective valves 40,
The dump valve 42 is provided on the manifold 39 and is located downstream of the dump valve 41. Here, as the dump valve 42, a pilot air type spring return type three-port two-position switching valve is used, a connection pipe 37 is connected to the inflow side of the dump valve 42, and a manifold 39 inside the outflow side. The paint passage and the waste liquid tank 43 are connected to each other. The dump valve 42 supplies paint or the like from the color changing valve unit 1, the pump unit 9 or the like to the manifold 39 side when turned on, and discharges the previous color paint, thinner or the like to the waste liquid tank 43 side when 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, and the connecting pipe 44 is a coating machine unit 45 to be described later for the paint discharged from the paint passage. 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 tip side and atomizes a paint 46A for atomizing the coating material or the coating material at about -90 kV, for example. Of the rotary atomization type electrostatic coating machine 46 provided with an electrode (not shown) for charging to a predetermined high voltage, and a manifold 47, which is provided with paint or the like from the connection pipe 44 to the atomization head 46A. A trigger valve 48 to be supplied and a dump valve 49 which is provided in the manifold 47 and discharges the residual paint, thinner and the like, which have flowed out from the cleaning valve unit 38 during cleaning, to the waste liquid tank 43, are roughly configured. Then, the coating machine unit 45 is held at the ground potential by electrically charging the paint particles supplied by the electrodes while atomizing the paint supplied from the connection pipe 44 through the trigger valve 48 and the like by the atomizing head 46A. The object to be coated (not shown) is coated by flying and adhering.

Here, the connecting pipe 44 is long, and the color change valve unit 1, the pump unit 9, and the
The cleaning valve unit 38 and the like are arranged 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 on the other end side are located in the coating booth and near the object to be coated. In the painting area 51 of.

The paint supply device according to the prior art has the above-mentioned structure, and its operation will be described below with reference to FIG.

First, when the A-color paint is applied to the object to be coated, the dump valve 42 of the cleaning valve unit 38 is connected to the manifold 39 side so that the connection pipes 37 and 44 are connected and the pump unit 9 of 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 and the A color paint valve 5A of the color change valve unit 1 are opened, and the drive motor 10 of the pump unit 9 is rotationally driven to drive the gear pump 11. As a result, the A-color paint flowing out from the A-color paint valve 5A reaches the gear pump 11 via the paint passage of the manifold 2 and the connection pipe 8, and the gear pump 11
Is supplied to the atomizing head 46A of the coating machine 46 through the connecting pipe 37, the dump valve 42, the manifold 39, the connecting pipe 44, the manifold 47, and the trigger valve 48 at a predetermined flow rate, and is atomized by the atomizing head 46A. Fly to the object to be coated.

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

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.
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 connecting 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 valve 3 and the thinner valve 4 of the color change valve unit 1 and the air and thinner from the air valve 40 and the thinner valve 41 of the cleaning valve unit 38, respectively. Are discharged alternately. As a result, air from the color change valve unit 1 and thinner are applied to the manifold 2, the connection pipe 8, and the A in the gear pump 11.
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 by the air and thinner from the cleaning valve unit 38 into the waste liquid tank 43 from the dump valve 49, and is quickly cleaned. Further, in the coating machine unit 45, when the thinner is finally discharged from the thinner valve 41, the dump valve 49 is closed and the trigger valve 48 is opened, so that the thinner is applied to the coating machine 4.
6 to wash the atomizing head 46A of the coating machine 46 and the like.

On the other hand, the manifold 2 and the connecting pipes 8, 37
When the cleaning of the flow path consisting of is completed, the bypass valve 34 is closed and the air and thinner from the air valve 3 and thinner valve 4 are circulated in the gear pump 11, and the gear chamber 17 in the gear pump 11 and each gear 24 , 25 etc. are washed. Further, 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 is formed through the formed communication passage 20.
By circulating the inside, the outer peripheral side of each shaft 26, 29 is cleaned.

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 change valve unit 1 is opened to B
The color paint is supplied 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 from the gear pump 11 through the paint passage of the manifold 2 and the connection pipe 8. Further, at this time, the dump valve 49 is installed 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 to spray the atomizing head 46A of the coating machine 46.
The B color paint is supplied up to and the paint is filled (disposal spray). When the preparation for B-color painting is completed, B-color painting is performed on the object to be coated, as in the case of A-color painting described above.

[0036]

By the way, in the above-mentioned prior art, since 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
There is a problem that 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 pilot air piping or thinner piping (neither is shown) to the
Since they are arranged around 4, 35 and 36, there is a problem that the pipe connecting work becomes complicated and the workability at the time of assembly and maintenance is deteriorated.

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

[0039]

In order to solve the above-mentioned problems, the characteristic feature of the structure of the coating gear pump device adopted by the present invention is that the gear pump has a casing defining a gear chamber inside, and a casing of the casing. A drive gear and a driven gear that are arranged so as to mesh with each other in a gear chamber, a drive shaft that is rotatably supported by the casing and that connects the drive gear to the drive motor, and the driven gear with respect to the casing. A driven shaft that supports the gear chamber suction side in the casing, a supply passage for supplying paint into the gear chamber, and a gear chamber discharge side in the casing, and discharge from the gear chamber. The valve assembly is provided with a discharge passage for discharging the paint to the outside of the casing, and a cleaning fluid flow passage which is formed in each of the drive shaft and the driven shaft and allows a cleaning fluid to flow between the valve assembly. Is a manifold block having a valve body accommodating portion formed therein, a bypass passage provided in the manifold block and communicating with the supply passage and the discharge passage, and the valve body accommodating portion located in the middle of the bypass passage. A bypass valve which is provided in the portion and which communicates and blocks the bypass passage by supplying and discharging signal air; and a cleaning fluid supply and discharge passage provided in the manifold block so as to communicate with the cleaning fluid flow passage of the gear pump, The shaft cleaning valve is located in the cleaning fluid supply / discharge passage and is provided in the valve body accommodating portion, and connects and disconnects the cleaning fluid supply / discharge passage by supplying and discharging 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. It is preferably arranged on the surface.

Further, in the manifold block,
An intrinsically safe explosion-proof solenoid valve for controlling signal air, which supplies and discharges signal air to and from the bypass valve and the shaft cleaning valve, may be integrally provided.

[0042]

With the above construction, the bypass valve and the shaft cleaning valve are housed in the valve body accommodating portion formed in the manifold block, and the bypass valve is 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 accommodated in the valve body accommodating portion are on the same surface. With the above arrangement, the valve body accommodating portion can be easily formed in the manifold block, and the signal air piping can be easily connected to the signal air connection port.

Furthermore, by using the intrinsically safe explosion-proof solenoid valve, the intrinsically safe explosion-proof solenoid valve can be arranged in the vicinity of the bypass valve and the shaft cleaning valve, and signals supplied to and discharged from the bypass valve and the shaft cleaning valve. The responsiveness can be improved by shortening the air flow path.

[0045]

DETAILED 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 described above are designated by the same reference numerals, and the description thereof will be omitted.

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

In the figure, reference numeral 61 shows 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. , An outlet-side shaft cleaning valve 68 and the like.

Reference numeral 62 denotes a manifold block which constitutes the outer shell of the valve assembly 61, 63 denotes a block main body which constitutes the manifold block 62 together with a passage plate 64 which will be described later, and the block main body 63 has the structure shown in FIG. A bypass valve accommodating portion 63A as a valve element accommodating portion on the right side, into which the bypass valve 66 is inserted, and an inlet side shaft cleaning valve 67 and an outlet side shaft cleaning valve 68, which are located on the left side. Cleaning valve accommodating portions 63B and 63C as valve element accommodating portions are formed so as to penetrate upward and downward. Further, as shown in FIG. 3, the block body 63 has a bypass valve accommodating portion 63.
The paint connection ports 63D and 63E, which are located between A and 63B and are connected to the communication passages 14C and 14D formed in the front plate portion 14 of the gear pump 11, the thinner flow passage 28 formed in the drive shaft 26, and the follower. The thinner flow passage 3 formed on the shaft 29
Thinner connection ports 63F and 63G connected to 0 are provided, and the paint connection port 63E is connected to the lower end side of the bypass valve accommodating portion 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 has a bypass passage 64A for connecting the bypass valve accommodating portion 63A and the paint connection port 63D and a washing valve accommodating portion. Portion 63B and thinner connection port 6
A thinner supply passage 64B as a cleaning fluid supply / discharge passage for connecting to the 3F, a cleaning valve accommodating portion 63C, and a thinner connection port 6
It is formed so as not to interfere with the thinner discharge passage 64C as a cleaning fluid supply / discharge passage that connects with 3G.

Further, 65, 65, ... Are block main bodies 63.
3 shows a cylindrical valve seat member inserted into the lower end side opening of each of the accommodating portions 63A, 63B, 63C, and a valve for separating and seating the valve body 71 on the inner peripheral side of each valve seat member 65. The seat 65A is formed.

Reference numeral 66 is a bypass valve inserted in the bypass valve accommodating portion 63A of the block main body 63, 67 is an inlet side shaft cleaning valve inserted in the cleaning valve accommodating portion 63B, and 68
Indicates an outlet side shaft cleaning valve inserted into the cleaning valve accommodating portion 63C, and each of the valves 66, 67 and 68 is a retainer 69, a valve body 71, an air passage 72, a cover 73, a valve spring 75 which will be described later. Etc. In addition, each valve 66,
Since the configurations of 67 and 68 are similar to each other, 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.

The inlet side shaft cleaning valve 67 will be described with reference to FIG. 4. 69 is the cleaning valve accommodating portion 63 of the block body 63.
A stepped tubular retainer provided on the lower side of B is shown. The retainer 69 is inserted and fitted together with a ring seal 70 and the like, and a valve element 71 is axially displaceably inserted on the inner peripheral side thereof. .

Reference numeral 71 denotes a valve body provided axially slidably in the cleaning valve accommodating portion 63B. The valve body 71 has its tip end inserted into the retainer 69 and extends downward to form a base end. The side is inserted into a cover 73 provided on the upper end side of the cleaning valve accommodating portion 63B, and the piston 7 that defines the inside of the cleaning valve accommodating portion 63B into upper and lower air chambers A and B is formed in the middle portion.
1A is formed so as to project in the radial direction. Further, an air passage 72 is formed in the valve body 71, the upper end side of the air passage 72 opens at the upper end surface of the valve body 71, and the lower end side of the piston 7
The lower end surface of 1A, that is, the air chamber B is opened.

Reference numeral 73 denotes a stepped cylindrical cover screwed to cover the upper end side opening of the cleaning valve accommodating portion 63B, and the connection port 74 protruding upward is provided on the upper surface side of the cover 73.
Is integrally formed, and a pilot air pipe 78, which will be 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 body 63 so as to communicate with the lower side of the cleaning valve accommodating portion 63B, and the thinner inflow connection port 76 is connected to the thinner source. ing. Also, 77
Is a thinner outflow connection port for outflowing thinner from the outlet side shaft washing valve 68, and the thinner outflow connection port 77 is connected to a waste liquid tank via a joint (not shown).

When the pilot air is supplied to the inlet-side shaft washing valve 67 through the pilot air pipe 78 as the signal air pipe connected to the connection port 74, the pilot air is fed through the air passage 72. By flowing into the air chamber B and displacing the valve body 71 in the valve opening direction against the biasing force of the valve spring 75 by the pressure of the pilot air, cleaning is performed from the thinner source through the thinner inflow connection port 76 and the like. The thinner flowing into the valve accommodating portion 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. Further, when the outlet side shaft washing valve 68 is opened, the thinner discharged from the thinner flow passage 30 of the driven shaft 29 is discharged through the thinner connection port 63G, the thinner discharge passage 64C and the thinner outflow connection port 77. Let it flow into the tank. On the other hand, when the shaft cleaning valves 67 and 68 are closed, the thinner is cut off.

Further, when the bypass valve 66 is opened by the supply of pilot air, the front plate portion 14 is protected from the paint and the like flowing from the connecting pipe 8 into the supply passage 18 of the gear pump 11.
Through the communication passage 14C and the paint connection port 63D into the bypass valve accommodating portion 63A, and the paint or the like is passed through the bypass passage 64A, the paint connection port 63E, and the communication passage 14D.
Through 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 by the urging force of 5,
The paint or the like flowing in 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 above-mentioned valve assembly 61, the bypass valve 66 and the inlet side shaft cleaning are formed by forming the accommodating 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 washing valve 68
The workability when assembling each of the housings 63A, 63B, 63C is improved.

The valve assembly 61 according to this embodiment has the structure as described above, and its basic operation is shown in FIG.
There is no particular difference from the valve assembly 32 according to the related art described with reference to FIG.

However, according to the present embodiment, the bypass valve accommodating portion 63A and the washing valve accommodating portions 63B and 63C are formed in the single block body 63 which constitutes the manifold block 62, and the accommodating portions 63A, 63B and 63C are formed. Since the bypass valve 66, the inlet side shaft cleaning valve 67, and the outlet side shaft cleaning valve 68 are housed inside, the block main body 63 is connected to each valve 6.
Can be used as a casing for 6, 67, 68,
Prevent each valve 66, 67, 68 from protruding to the outside,
The valve assembly 61 can be downsized.

Further, since the accommodating portions 63A, 63B, 63C are formed in the block main body 63 of the valve assembly 61 so as to open on the same plane (upper end surface), the accommodating portions 63A, 63A,
In addition to improving the drilling workability for forming 63B and 63C, the bypass valve 66, the inlet side shaft cleaning valve 67, and the outlet side shaft cleaning valve 68 to the respective accommodating portions 63A, 63B and 63C.
The assembling property of can be improved.

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

Next, FIGS. 5 to 7 show a second embodiment of the present invention. The feature of this embodiment is that a bypass valve, an inlet side shaft cleaning valve, and an outlet side shaft cleaning are performed by an intrinsically safe explosion-proof solenoid valve. 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 described above are designated by the same reference numerals, and the description thereof will be omitted.

In the figure, reference numeral 81 indicates 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, they are different in that the bypass valve 66, the inlet side shaft cleaning valve 67, and the outlet side shaft cleaning valve 68 are each equipped with an intrinsically safe explosion-proof solenoid valve 83, which will be described later.

The covers 82, 82, ... Are screwed to cover the upper end openings of the valve accommodating portions 63A, 63B, 63C of the block body 63, and the covers 83, 83 ,.
6 shows an intrinsically safe explosion-proof solenoid valve (hereinafter referred to as a main safety solenoid valve 83) located integrally with the block body 63 at the upper end side of the main safety solenoid valve 83, as shown in FIG.
A valve casing 84, a coil 91, and a plunger 9 described later.
It is configured as a normally closed 3-port 2-position direct-acting solenoid valve including a flapper 96 and the like.

Reference numeral 84 denotes a valve casing constituting the outer shell of the main safety solenoid valve 83. The valve casing 84 is located at the lower end side and has a flange portion 84A fixed to the block body 63, as shown in FIG. A casing main body 84B disposed above the flange portion 84A, and the casing main body 84
And a solenoid casing 84C disposed on the upper side of B.

Reference numeral 85 denotes an air supply port provided in the casing main body 84B of the valve casing 84, and 86 denotes an exhaust port provided below the air supply port 85 and provided in the casing main body 84B. The port 85 and the exhaust port 86 have an air supply port 85A and an exhaust port 86A, which have one end side extending and opening in the casing main body 84B, and the other end side opening to the outer peripheral surface of the casing main body 84B. And
The air supply port 85 is connected to a compressed air source via an air pipe (not shown).

Reference numeral 87 denotes a valve chamber formed in the casing main body 84B of the valve casing 84, and 88 denotes a supply / discharge port provided at the center of the flange portion 84A located below the valve chamber 87. An upper end side of the supply / discharge port 88 is opened and communicated with the valve chamber 87, and a lower end side thereof is opened with the cover 82 of the valve assembly 81 and communicated with the air passage 72.

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

The plunger 93 is constantly urged downward by a plunger spring 94 serving as a valve spring, and a disc-shaped valve body 95 made of synthetic rubber or the like is provided on the lower surface side thereof. . And the plunger 93
Is urged by the plunger spring 94 when the coil 91 is not energized and is displaced downward so that the valve body 95 is seated on the air supply port 85A of the air supply port 85, while it is attracted to the column 92 when the coil 91 is energized. The valve body 9
5 is separated from the air supply port 85A.

96 is a flapper which is provided between the exhaust port 86A of the exhaust port 86 and the supply / exhaust port 88 and is provided in the valve chamber 87, and which is a disk-shaped second valve body made of synthetic rubber or the like. 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 biased 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 the flapper 96 moves downward.
While being separated from the exhaust port 86A of No. 6, when the coil 91 is energized, it is displaced upward together with the plunger 93 and seated on the exhaust port 86A.

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

First, when the coil 91 of the main solenoid valve 83 is de-energized and the plunger 93 is biased by the plunger spring 94 and is displaced downward, the valve body 95 causes the air inlet port 85A of the air inlet port 85A. Sit on the flapper 9
6 is separated from the exhaust port 86A of the exhaust port 86.

As a result, the lower air chamber B and the exhaust port 86
Communicate with each other through the air passage 72, the air supply / exhaust port 88, and the valve chamber 87, and the pilot air in the air chamber B is exhausted from the exhaust port 86 to reduce the pressure. Therefore, the valve body 71 of the bypass valve 66 is biased by the valve spring 75 and is displaced downward,
The valve seat 65 is seated on the valve seat 65A to close the valve.

Next, when the coil 91 of the main safety solenoid valve 83 is energized and the plunger 93 is attracted by the column 92 and is displaced upward, the valve body 95 moves the valve body 95 to the air supply port 85A of the air supply port 85.
The flapper 96 is seated on the exhaust port 86A of the exhaust port 86 while being separated from.

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

Thus, according to this embodiment, three main safety electromagnetic valves 83 are attached to the manifold block 62, and the bypass valves 66 and the inlet side shaft cleaning valve 6 are connected to the respective main safety electromagnetic valves 83.
7. Since the pilot air to the outlet side shaft cleaning valve 68 is controlled respectively, the flow path through which the pilot air flows can be greatly shortened and the occurrence of reaction delay during operation can be effectively prevented. However, the responsiveness can be greatly improved.

In each of the above embodiments, the valve assembly 61,
Although 81 has been described as having three valve bodies of the bypass valve 66, the inlet side shaft cleaning valve 67, and the outlet side shaft cleaning valve 68, the present invention is not limited to this, and for example, the outlet side shaft cleaning valve 68.
May be eliminated and the thinner supply may be controlled only by the inlet side shaft cleaning valve 67. On the other hand, a throttle valve or the like may be added to the bypass valve 66, the inlet side shaft cleaning valve 67, and the outlet side shaft cleaning valve 68. You may make it provide four or more valve bodies.

Further, in each of the above-mentioned embodiments, the case of cleaning using thinner was described as an example, but in the case of a water-based paint, water can be used as a cleaning liquid.

Further, in each of the above-described embodiments, the flashable gear pump 11 is described as an example in which the paint is supplied to the rotary atomizing type electrostatic coating machine 46. However, the gear pump 11 is hydraulically atomizing type. It may be used to supply paint to other coating machines such as coating machines and air atomization type coating machines.

[0082]

As described above in detail, according to the present invention, a valve assembly is provided with 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 bypass passage, a bypass valve provided in the valve body accommodating portion located in the middle of the bypass passage, for communicating and blocking the bypass passage by supplying and discharging signal air, and a cleaning fluid flow passage for the gear pump. And a cleaning fluid supply / discharge passage provided in the manifold block so as to communicate with the manifold block, and provided in the valve body accommodating portion located in the middle of the cleaning fluid supply / discharge passage. The manifold block consists of a bypass valve, which connects and disconnects the exhaust passage.
It can be used as a casing for a shaft cleaning valve, and it is possible to prevent each valve element from protruding from the manifold block as in the prior art, and to downsize 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 accommodated in the valve body accommodating portion are formed on the same surface. Since it is configured to be installed in the manifold block, the valve body accommodating portion can be easily formed in the manifold block, workability can be improved, the bypass valve and the shaft cleaning valve can be assembled, and the signal air piping can be connected to the connection port. Workability such as work can be improved.

Furthermore, 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 invention described above, a signal for controlling the bypass valve and the shaft cleaning valve is provided. The air circulation distance can be shortened, the reaction delay due to air can be prevented, and the responsiveness can be improved.

[Brief description of drawings]

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

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

FIG. 3 is a view showing each accommodation portion and each connection port of the block body.
FIG. 3 is a transverse sectional view as seen from the direction of the arrow III-III in the middle.

FIG. 4 is an enlarged cross-sectional view as seen from the direction of arrows IV-IV in FIG.

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

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

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

FIG. 8 is an overall configuration diagram showing a paint supply device using a valve assembly according to a conventional technique.

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

10 is a vertical cross-sectional view of the flashable gear pump shown in FIG.

11 is a transverse cross-sectional view showing a state in which a drive gear and a driven gear are housed in a housing hole of a gear casing portion, as seen from the direction of arrow XI-XI in FIG.

12 is a view showing the relationship between the supply passage and the discharge passage and the suction portion and the discharge portion of the gear casing portion, which are indicated by arrows XII-XII in FIG.
FIG.

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

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

[Explanation of symbols]

 9 pump unit (gear pump device for coating) 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 driven shaft 61, 81 valve assembly 62 manifold block 63 block body 63A bypass valve accommodating portion (valve element accommodating portion) 63B, 63C cleaning valve accommodating portion (valve element accommodating portion) 63D , 63E Paint connection port 63F, 63G Thinner connection port 63H Bypass passage 64 Pass plate 64A Bypass passage 64B Thinner supply passage (cleaning fluid supply / discharge passage) 64C Thinner discharge passage (cleaning fluid supply / discharge passage) 66 Bypass valve 67 Inlet side Shaft cleaning valve 68 Outlet side shaft cleaning valve 74 Connection Port 78 Pilot air piping (Signal air piping) 83 Intrinsically safe explosion-proof solenoid valve

Claims (3)

[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. With respect to the casing, a drive gear and a driven gear that are arranged to mesh with each other in a gear chamber of the casing, a drive shaft that is rotatably supported by the casing, and that connects the drive gear to the drive motor, and the casing. A driven shaft that supports the driven gear and a communication with the gear chamber suction side in the casing,
A supply passage for supplying paint into the gear chamber, a discharge passage communicating with the discharge side of the gear chamber in the casing for discharging paint discharged from the gear chamber to the outside of the casing, and the drive shaft and the driven shaft. Each of the valve assemblies has a cleaning fluid flow passage for allowing a cleaning fluid to flow between the valve assembly and the valve assembly. The valve assembly includes a manifold block in which a valve body accommodating portion is formed, and a manifold block in the manifold block. A bypass passage that is provided and communicates with the supply passage and the discharge passage, and is provided in the valve body accommodating portion located in the middle of the bypass passage,
A bypass valve for connecting and disconnecting the bypass passage by supplying and discharging signal air, a cleaning fluid supply / discharge passage provided in the manifold block so as to communicate with the cleaning fluid flow passage of the gear pump, and the cleaning fluid supply / discharge passage And a shaft cleaning valve which is provided in the valve body accommodating portion and is connected to and cuts off the cleaning fluid supply / discharge passage by supplying and discharging signal air. 2. 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. The coating gear pump device according to claim 1, wherein the coating gear pump device is arranged on a surface. 3. An intrinsically safe explosion-proof solenoid valve for controlling signal air that supplies and discharges signal air to and from the bypass valve and the shaft cleaning valve, respectively, is integrally provided in the manifold block. Alternatively, the coating gear pump device according to the item 2.