JPH0118204Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention is a type of paint sprayer in which the atomized charged paint particles are directed toward the object to be coated along the lines of electric force by rotating the rotary atomizer head at high speed and are applied to the object to be coated. This invention relates to an electrostatic spray device.

Conventionally, this type of electrostatic spraying device supports a rotating shaft via a bearing such as a ball bearing or a roller bearing, an air-driven turbine is attached to one end of the rotating shaft, and a rotating atomizer is attached to the other end. The rotary atomizing head is attached, and the rotary atomizing head is rotated at high speed by the turbine while applying a high voltage to atomize the paint supplied to the rotary atomizing head. To atomize the paint, the rotating atomizer head is rotated at high speed, and the paint supplied to the liquid contact surface is made to flow down to the discharge edge as a thin film-like liquid stream by centrifugal force. The paint is discharged from the discharge edge as liquid threads (cusps), and the liquid threads are further electrostatically atomized to form charged paint particles.

By the way, when liquid paint is atomized into paint particles and applied to an object to be coated, the quality of the coating film formed on the painted surface is determined by the maximum particle size and average particle size of the paint particles. It is known that when the maximum particle size is large, the quality of the coating film is significantly reduced. Therefore, the rotation speed of the rotating atomizing head has a large effect on the particle size, and the higher the rotation speed of the rotating atomizing head, the smaller the particle size can be, which improves the quality of the coating film. can be done.

However, since the above conventional technology uses ball bearings or roller bearings as a means to support the rotating shaft, the rotation tolerance is limited to 25,000 to 40,000 rpm in order to prevent seizure of these bearings. .
However, when the rotational speed of the rotary atomizing head is about 40,000 rpm or less, the average particle size of the paint becomes considerably large, and there is a problem that good paint film quality cannot be obtained.

In order to solve these problems, a static air bearing is used as a bearing to support the rotating shaft without contact, and the rotation speed of the rotating atomizing head is increased to about 60,000 to 100,000 rpm. Kaisho
An electrostatic spraying device as shown in Japanese Patent No. 56-115652 is known.

That is, the electrostatic spraying device according to the above-mentioned prior art includes a housing in which a shaft hole is formed in the axial direction and a turbine chamber is formed in the radial direction on one end side of the shaft hole, and a housing in which a shaft hole is formed in the shaft hole of the housing. a rotating shaft fitted into the housing; a turbine loosely fitted into a turbine chamber of the housing and fixed to one end of the rotating shaft;
a rotating atomizing head located outside the housing and fixed to the other end of the rotating shaft; and a rotating atomizing head located around the rotating shaft and provided on the housing to support the rotating shaft in a non-contact state. The turbine is generally comprised of a radial air bearing and a thrust air bearing that is located on both sides of the turbine and provided in the housing to support the turbine in a non-contact manner, and is capable of supplying high pressure air to the turbine. Therefore, the rotary shaft is rotated at high speed, and high pressure air is supplied to the radial bearing and the thrust bearing to support the rotary shaft, while paint is supplied to the rotary atomizing head and paint particles are atomized from the discharge edge. is being done.

In this way, electrostatic spraying devices using static pressure air bearings can achieve more than twice the high speed of rotation compared to devices using ball bearings, roller bearings, etc., and also have a smaller housing. be able to.

By the way, the electrostatic spraying device according to the prior art described above is configured as shown in FIG. 1, for example.
That is, there is a housing 101 containing a turbine and thrust and radial static pressure air bearings, and a housing 101 that is rotatably supported within the housing 101 by the thrust and radial static pressure air bearings and is driven by the turbine. The rotating shaft 102 has a rotating shaft 102, and a bell-shaped rotating atomizing head 103 is fixed to the tip of the rotating shaft 102. The head body 105 is composed of a head body 105. And the hub member 10
4 has a liquid contact surface 104A formed therein, and a plurality of paint passages 104B, 104B, . . .
Further, the atomizing head body 105 has a liquid contact surface 10 that thins the paint from each paint passage 104B into a thin film.
5A is formed, the tip of which is a discharge edge 105B. Further, a paint tube 106 is fixed to the housing 101 diagonally, one end of the paint tube 106 is connected to a paint source, the other end is inserted into the hub member 104, and the liquid contact surface 106 is connected to the paint source.
The paint is dripped onto 4A.

107 is an air ring provided at the tip of the housing 101, and the air ring 107 has an annular groove 107A formed therein, and the atomizing head body 105.
A large number of injection holes 107B, 107B, . . . for injection of shaping air from the rear surface 105C side are formed at equal intervals. And the air ring 10
The annular groove 107A of No. 7 is connected to an air tube 109 for shaping air via an air passage 108 bored in the housing 101. As a result, a spray pattern of the paint sprayed from the rotary atomizing head 103 is formed.

When using the rotating atomizing head 103 having the above-described shape, the rotational speed of the rotating atomizing head 103 can be increased by supporting the rotating shaft 102 with thrust and radial static pressure air bearings. Although the shape of 101 could be made smaller, it still had the following drawbacks.

First, the hub member 104 of the rotating atomizing head 103
In addition, it is necessary to insert the paint tube 106 outside the rotating shaft 102, and since the rotating atomizing head 103 is composed of a hub member 104 and an atomizing head main body 105, the overall shape is or the bell caliber becomes larger. As a result, the spray pattern becomes large, making it unsuitable for so-called flat spraying or spot spraying.

Second, the rotating atomizing head 103 has a separate wetted surface 10
4A, 105A, and the paint passage 1 that communicates them.
04B, the cleaning performance of the rotary atomizing head 103 is poor, and there is a drawback that not only does it take a long time to change the color, but also a large amount of thinner is required.

Third, the paint tube 106 is connected to the housing 10
Since it is installed diagonally with respect to 1,
When the electrostatic spraying device is attached to an industrial robot or reciprocator, the paint piping connected to the paint tube 106 gets in the way, making it impossible to paint objects that have narrow areas. It was hot.

Fourth, the air ring 107 is attached to the housing 101.
At the same time, the air tube 109 is attached diagonally to the housing 101.
Similar to the third drawback mentioned above, air tube 109
There was a drawback that it got in the way.

The present invention has been developed in view of the drawbacks of the prior art described above, and when ball bearings or roller bearings are used as bearings,
As the diameter of the rotating shaft increases, the circumferential speed of the rotating shaft also increases, which increases sliding resistance, and it is not possible to increase the diameter of the rotating shaft due to problems such as seizure. This was done with the focus on the fact that when bearings are used, the diameter of the rotating shaft can be increased because there is no contact with the bearings and there is no chance of problems such as seizure. It is. Therefore, by supporting the rotating shaft with a static pressure air bearing, and coaxially inserting an inner cylinder that serves as a paint passage and an outer cylinder that forms an air passage between the inner cylinder and the rotating shaft. , including the caliber of the rotating atomizing head,
The overall shape of the housing has been made smaller, and the rotating atomizing head is easier to clean, making it easier to attach to industrial robots and reciprocators. Moreover, the shaping air flows uniformly over the entire back surface of the rotating atomizing head, resulting in good atomization. It is an object of the present invention to provide an electrostatic spraying device that can obtain a pattern.

In order to achieve the above object, the features of the configuration adopted by the present invention are that an outer cylinder is inserted into the rotating shaft supported by a hydrostatic air bearing in a non-contact state with respect to the rotating shaft; An inner cylinder is inserted into the inner cylinder, and the inside of the inner cylinder is used as a paint passage for supplying paint toward the liquid contact surface of the rotary atomizing head, and between the inner cylinder and the outer cylinder is connected to the rotary atomizing head. The purpose is to create an air passageway that supplies shaping air towards the target.

The present invention will be described in detail below based on the embodiments shown in FIGS. 2 and 3.

In the drawings, reference numeral 1 denotes a cylindrical housing made of a metal body, in which a shaft hole 2 is bored in the axial direction, and a circular turbine chamber 3 is formed in the radial direction at one end of the shaft hole 2. The other end of the shaft hole 2 is an opening 2A. Reference numeral 4 denotes a hollow rotating shaft made of a metal material that is loosely fitted into the shaft hole 2 with a small gap in the radial direction.
A hollow hole 4A is bored in the axial direction, and
Its tip is located outside the housing 1 and has a tapered surface 4.
It is marked B. Reference numeral 5 denotes a disk-shaped turbine made of a metal material loosely fitted in the turbine chamber 3 with a small gap in the axial direction, and the turbine 5 is attached to one end of the rotating shaft 4 by, for example, welding. , are fixed by means such as bolts, and a large number of blades 5A, 5A, . . . are provided on the outer peripheral surface of the turbine 5.

A rotating atomizing head 6 is located outside the housing 1 and is fixed to the other end of the rotating shaft 4. In this embodiment, the rotating atomizing head 6 is a cylindrical or bell-shaped atomizing head. . Here, the rotating atomizing head 6 is connected to the rotating shaft 4.
an atomizing head main body 6A that is fitted into the tapered surface 4B of the
A set bolt 6B screwing the atomizing head main body 6A to the tip of the hollow hole 4A of the rotating shaft 4, and the atomizing head main body 6
A shaping air cylinder 6C is loosely fitted with a predetermined gap on the outer circumferential side of the atomizing head body 6A and its base is fixed to the atomizing head body 6A, and the inner circumferential side of the atomizing head body 6A and the set bolt 6B is A liquid contact surface 7 is formed that expands toward the tip. The space between the outer circumferential surface of the atomizing head body 6A and the inner circumferential surface of the shaping air cylinder 6C becomes an annular ejection passage 8 for ejecting shaping air, and the ejection passage 8 is located inside the circular hole 4A located on the tip side of the rotating shaft 4. An annular groove 9, an air passage 10 with one end opening into the annular groove 9 and the other end opening into the tapered surface 4B, an annular groove 11 on the base side of the atomizing head main body 6A, and one end opening into the annular groove 11. An annular air passage 3 in the rotating shaft 4 as described later is connected to the annular air passage 12 through an air passage 12 whose other end is open to the annular jet passage 8.
It communicates with 1.

Reference numeral 13 denotes a radial air bearing located around the rotating shaft 4 and disposed in the housing 1 in order to support the rotating shaft 4 in a non-contact state with respect to the shaft hole 2; Sleeve-shaped bearings 13A, 13A made of a porous metal material such as sintered metal are fixed to the housing 1 so as to surround the outer periphery of the bearings 13A, and the bearings 13A are located on the outer peripheral surface side of the bearings 13A and are formed concentrically with the shaft hole 2. It consists of an air chamber 13B.
The air bearing 13 constitutes a static pressure air bearing from a bearing 13A and an air chamber 13B, and as described later, the high pressure air supplied to the air chamber 13B is transferred to the bearing 13.
By ejecting from A in the direction of the arrow in the figure, the rotating shaft 4 can be supported in a non-contact state.

Further, reference numerals 14 and 14 denote thrust air bearings that are disposed in the housing 1 and located on both sides of the turbine 5 in order to support the turbine 5 in a non-contact state with respect to the turbine chamber 3. are annular bearings 14A, 14A made of a porous metal material such as sintered metal fixed to the housing 1 so as to sandwich both sides of the turbine 5, and formed on the housing 1 at the back side of the bearings 14A. air chamber 14
It consists of B. And each of the air bearings 1
4 also constitutes a static pressure air bearing, and by blowing out the high pressure air supplied to the air chamber 14B in the direction of the arrow in the figure, the turbine 5 can be supported in a non-contact state.

Reference numeral 15 denotes a bearing air passage formed in the housing 1. One end of the air passage 15 is connected to a pressurized air source (not shown), and the other end is connected to each air bearing 13, 1.
It is connected to No. 4 air chambers 13B and 14B. 1
6 is an exhaust passage; one end of the exhaust passage 16 opens into the shaft hole 2 in the middle of each air bearing 13, 14, and the other end is connected to a muffler 17 provided in the housing 1. Reference numeral 18 denotes a turbine driving air passage formed in the housing 1. One end of the air passage 18 is connected to a pressure source, and the other end serves as a nozzle opening facing the front surface of the blade 5A of the turbine 5. Here, by injecting high-pressure air toward the blades 5A of the turbine 5, the turbine 5 can be rotated at a high speed of 60,000 to 100,000 rpm together with the rotating shaft 4 and the rotating atomizing head 6.

Further, reference numeral 19 denotes a rear bracket made of a metal body fixed to one end side of the housing 1, and the rear bracket 19 also constitutes a part of the housing 1. A bottomed hole 20 is bored in the rear bracket 19 in the axial direction, and an L-shaped paint passage 21 is formed at the bottom of the hole 20, and air is provided in the radial direction from the center to the bottom in the figure. Inflow passage 2
2 is formed. Reference numeral 23 denotes a cylinder receiving member inserted into the bottomed hole 20, and the cylinder receiving member 23 has a small diameter portion 23A on the axially proximal end side along the axial direction thereof;
A three-step stepped hole is bored from the small diameter portion 23A toward the distal end side, consisting of a relatively long medium diameter portion 23B and a large diameter portion 23C located on the distal end side, and corresponds to the air inflow passage 22. A plurality of air passages 24 opening into the medium diameter portion 23B are formed at a plurality of positions in the radial direction.

Reference numeral 25 denotes an inner cylinder inserted in the axial direction into the hollow hole 4A of the rotating shaft 4, and 26 is an outer cylinder inserted into the hollow hole 4A so as to be coaxial with the inner cylinder 25. It is loosely fitted into the hollow hole 4A with a minute gap between it and the hollow hole 4A. One end of the inner cylinder 25 is fitted into the small diameter portion 23A of the cylinder receiving member 23, and the other end extends to the vicinity of the tip of the rotating shaft 4. Further, one end of the outer cylinder 26 is fitted into the large diameter portion 23C, and the other end similarly extends to the vicinity of the tip of the rotating shaft 4. Reference numeral 27 designates another cylinder receiving member located on the tip side of the rotating shaft 4, and one side of the cylinder receiving member 27 is loosely fitted into the hollow hole 4A to support the inner cylinder 25 and the outer cylinder 2.
Each other end side of 6 is fixed. The other side of the cylinder support member 27 is loosely fitted into the set bolt 6B of the rotary atomizing head 6, and a paint passage 28 is bored in the axial direction inside, and a nozzle 29 communicating with the paint passage 28 is provided. The nozzle 29 has a nozzle opening 29A for ejecting paint onto the liquid contact surface 7.

Thus, a paint passage 30 is formed within the inner cylinder 25, and one end of the paint passage 30 is connected to the rear bracket 1.
The other end communicates with a paint passage 21 formed in the tube support member 27 and is supplied to a nozzle 29 . On the other hand, an air passage 31 is formed between the inner cylinder 25 and the outer cylinder 26 (partially between the inner cylinder 25 and the middle diameter portion 23B), and one end of the air passage 31 is formed in the rear bracket 19. The other end communicates with an annular groove 9 formed in the rotating shaft 4 via a plurality of air holes 32 formed at the tip of the outer cylinder 26 .

Furthermore, 33 is a paint valve device fixed to the rear bracket 19, and the paint valve device 33 has a valve casing 34, in which a paint inflow passage 35 and a paint outflow passage 36 are arranged in the radial direction. At the same time, a paint supply passage 37 is formed which communicates with each passage in the axial direction. A valve seat 38 is provided on a connecting surface between the rear bracket 19 and the valve casing 34, and the paint supply passage 37 and the paint passage 21 communicate with each other through the valve seat 38.
39 is a cylinder formed in the valve casing 34;
40 is a piston that is slidably provided in the cylinder 40; 41 is a valve body that is seated on and off the valve seat 38; one end of the valve body 41 is fixed to the piston 40, and the other end is installed in the cylinder 39; From the paint supply passage 37 to the valve seat 38 via the disposed retainer 42
is coming. A spring 43 is stretched between the piston 40 and the cap 44 in order to urge the valve body 41 toward the valve seat 38. 45 is piston 4
The cylinder 39 is located between the cylinder 39 and the retainer 42.
A pressure chamber 45 is defined within the pressure chamber 45 and is connected to a valve control air passage 46 .

In the figure, reference numeral 47 indicates a mounting bracket fixed to the rear bracket 19, 48 indicates a high voltage cable connected to the mounting bracket 47, and the high voltage cable 48 is connected to a high voltage generator. Reference numeral 49 indicates a mounting bracket for mounting on an industrial robot, reciprocator, etc.

Figure 3 is a system diagram of the paint used in this example.
51 is a paint pipe connecting the color change valve 50 and the paint inflow passage 35 of the paint valve device 33; 52 is a paint Outflow passage 36 and waste liquid tank 53
A waste liquid pipe 54 connecting between the waste liquid pipe 52 indicates an on-off valve provided in the middle of the waste liquid pipe 52.

The present embodiment is constructed as described above, and its operation will now be described.

First, from the bearing air passage 15 to each air bearing 1
High pressure air is supplied to the air chambers 13B and 14B of No. 3 and 14, and the high pressure air is ejected from the bearings 13A and 14A in the direction of the arrow in the figure. As a result, the rotating shaft 4 is held in a non-contact state in the radial direction by the radial air bearing 13, and the turbine 5 is held in a non-contact state in the axial direction by the thrust air bearing 14.

In this state, when high-pressure air is supplied from the turbine drive air passage 18 toward the front surface of the blades 5A of the turbine 5, the turbine 5 rotates at high speed in the direction of arrow R in the figure together with the rotating shaft 4 and the rotating atomizing head 6. During this time, most of the exhaust from the air bearings 13, 14 and the turbine 5 is discharged into the atmosphere from the exhaust passage 16 through the muffler 17.

On the other hand, the high voltage cable 48 from the high voltage generator
When a high voltage of, for example, -90 [kV] is supplied to the housing 1 made of metal, the rear bracket 19
and charged to -90 [kV]. At this time, the rotating shaft 4 and the turbine 5 are in a non-contact state with the housing 1, but the rotating shaft 4 is loosely fitted into the shaft hole 2 with a small gap, and the turbine 5 is also fitted into the shaft hole 2. It is merely loosely fitted into the chamber 3 with a small gap. As a result, the housing 1 is charged with a high voltage, which causes the shaft hole 2 and the rotating shaft 4 to
During this period, a microscopic air layer interposed between the turbine chamber 3 and the turbine 5 causes dielectric breakdown, and the rotating shaft 4 and the turbine 5 receive -90 [kV] due to the discharge phenomenon.
is charged with electricity. Thus, the rotating atomizing head 6 also has the rotating shaft 4.
It will be charged to this high voltage via .

On the other hand, when valve control air is not supplied from the valve control air passage 46, the valve body 41 is seated on the valve seat 38 by the spring 43, and the on-off valve 54 is kept in the closed state. In this state, if paint of color A, for example, is supplied from the color change valve 50, the paint pipe 5
1, a paint inflow passage 35, a paint outflow passage 3
6. The liquid flows out toward the paint supply passage 37 and the waste liquid pipe 52, and fills the inside thereof.

Next, when valve control air is supplied from the valve control air passage 46 to the pressure chamber 45, the piston 40 is moved by the spring 43.
The valve body 41 is displaced to the right in the figure against the
Forcing people to leave their seats. As a result, the paint supply passage 37
The paint is ejected from the nozzle port 29A of the nozzle 29 toward the liquid contact surface 7 through the paint passage 21, the paint passage 30 in the inner cylinder 25, and the paint passage 28 in the cylinder support member 27. As a result, the centrifugal force generated when the rotary atomizing head 6 rotates at high speed forms an extremely thin film, which is ejected from the discharge edge of the atomizing head main body 6A as a liquid thread, becoming electrostatically atomized charged paint particles. The paint particles fly along the electric lines of force formed between the rotary atomizing head 6 and the object to be coated, and are applied to the object to be coated.

At this time, the charged paint particles tend to form an expanded spray pattern due to the centrifugal force of the rotating atomizing head 6, the air pumping phenomenon, and the like. Therefore, in this embodiment, when the shaping air is supplied to the air inflow passage 22, the air flows through the air passage 31 between the inner cylinder 25 and the outer cylinder 26, the air hole 32 at the tip of the outer cylinder 26, the annular groove 9, The air is supplied to the annular jetting passage 8 between the atomizing head main body 6A of the rotary atomizing head 6 and the shaping air cylinder 6C via the air passage 10, the annular groove 11, and the air passage 12 in this order. As a result, the ejection passage 8
Shaping air is ejected from the opening edge toward the object to be coated, forming a paint spray pattern.

Furthermore, in order to spray the next color paint, for example, the B color paint, it is necessary to wash all the areas to which the A color paint has adhered. Therefore, the supply of valve control air to the pressure chamber 45 is stopped, and the spring 43 causes the valve body 41 to
is seated on the valve seat 38, and the on-off valve 54 is opened. Then, air and thinner are sequentially supplied from the color change valve 50, and the paint pipe 51 and the paint inflow passage 3 are
5. The inside of the paint outflow passage 36, the paint supply passage 37, etc. are cleaned, and the thinner waste liquid and the like are discharged into the waste liquid tank 53 via the waste liquid pipe 52 and the on-off valve 54. At this time, high-speed cleaning can be performed by supplying air and thinner at high pressure.

Next, paint passages 21, 30, 28, nozzle 2
9. In order to clean the liquid contact surface 7, etc., open the valve body 41 again, close the on-off valve 54, and close the color change valve 5.
From 0, thinner and air are sequentially supplied to these interiors in a low pressure state to perform cleaning. At this time, the rotating atomizing head 6
Cleaning is carried out while rotating, but if the rotation is too fast, waste liquid will scatter around.
The rotational speed of the rotary atomizing head 6 is set to 5,000 to 10,000 rpm.

After all cleaning operations are completed, paint with B color can be applied in the same manner as described above.

In this embodiment, the paint passage 30 can be formed directly in the inner cylinder 25 inserted through the rotating shaft 4 serving as the center of rotation, and the nozzle 29 can be positioned at the center of the rotating atomizing head 6. I can do it. Therefore, when a ball bearing or roller bearing is used as a bearing, if the diameter of the rotating shaft is increased, the circumferential speed will increase and the sliding resistance between the rotating shaft and the rotating shaft will increase, resulting in seizure, etc. There is a risk of However, as bearings, thrust and radial static pressure air bearings 13,1
4, the inner tube 25 and the outer tube 26 can be provided within the rotary shaft 4 without any problem even if the diameter of the rotary shaft 4 is increased. Moreover, in addition to the advantage that the shape of the housing 1 can be made smaller compared to those using ball bearings or roller bearings, the rotating shaft 4
Since the paint passage 30 is formed inside the housing 1 using the so-called "center feed system", the shape of the housing 1 can be further reduced in size.

Further, since the nozzle 29 can have the nozzle opening 29A directly opened almost at the center of the rotating atomizing head 6, the shape of the rotating atomizing head 6 can be simplified compared to the conventional technique shown in FIG. Not only can the diameter be made small, but the cleaning performance can be improved and it can be applied to spot blowing, etc.

On the other hand, an outer cylinder 26 is provided inside the rotating shaft 4 on the outer circumferential side of the inner cylinder 25 in a non-contact state with the rotating shaft 4, and an air passage 31 for shaping air is formed inside and between the outer cylinders 25 and 26. , it is not necessary to provide an air ring 107 and an air tube 109 as in the prior art shown in FIG. Therefore,
It is possible to eliminate any obstructive tubes and piping (including paint tubes) near the rotary atomizing head 6, making it possible to perform good painting work in narrow painting areas, and making it suitable for industrial robots and reciprocators. It is suitable for use when attached to a camera.

Furthermore, by attaching the paint valve device 33 to the housing 1, the distance of the paint passage 30 between the paint valve device 33 and the rotary atomizing head 6 can be shortened. and paint valve device 33
It is only necessary to perform high-speed cleaning between the paint passage 30 and the rotary atomizing head 6, and to shorten the cleaning time.

In the above-described embodiments, the rotary atomizing head 6 has been described as having a cylindrical shape or a bell shape, but a so-called disk type or circular plate type may also be used. Furthermore, the object to which the present invention is applied is not limited to paint spraying equipment, but may also be spray granulation equipment, spray drying equipment, flash drying equipment, etc.

The electrostatic spraying device according to the present invention, as described in detail above, has a rotating shaft supported in a non-contact manner by a hydrostatic air bearing, and a paint passage and an air passage for shaping air are formed in the rotating shaft. Because of this configuration, the shapes of the housing and the rotating atomizing head can be reduced in size. Furthermore, since there are no paint tubes or shaping air tubes near the rotary atomizing head, they do not interfere with painting operations, making it suitable as an electrostatic spraying device for industrial robots and reciprocators. Further, by attaching the paint valve device to the housing, it is possible to shorten the cleaning time and other effects.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of a main part of an electrostatic spraying device according to the prior art, FIG. 2 is a vertical cross-sectional view of an electrostatic coating device according to the present invention, and FIG. 3 is a paint system diagram. 1... Housing, 2... Shaft hole, 3... Turbine chamber, 4... Rotating shaft, 5... Turbine, 6...
Rotating atomization head, 7... Liquid contact surface, 8... Circular jetting passage, 9, 11... Annular groove, 10, 12, 24,
31...Air passage, 13...Radial air bearing,
14... Thrust air bearing, 15... Bearing air passage, 16... Exhaust passage, 18... Turbine drive air passage, 19... Rear bracket, 20...
Bottomed hole, 21, 28, 30...Paint passage, 22...
... Air inflow passage, 23, 27 ... Cylinder support member, 25
... Inner cylinder, 26 ... Outer cylinder, 29 ... Nozzle, 32
...Air hole, 33...Paint valve device, 34...Valve casing, 35...Paint inflow passage, 36...Paint outflow passage, 37...Paint supply passage, 38...Valve seat, 39...Cylinder, 40...piston, 41
... Valve body, 43 ... Spring, 45 ... Pressure chamber, 46
...Valve control air passage, 48...High voltage cable.

Claims (1)

[Scope of utility model registration request] A housing having a shaft hole formed therein in the axial direction and a turbine chamber formed in the radial direction at one end of the shaft hole, a rotating shaft loosely fitted in the shaft hole of the housing, and a turbine chamber of the housing. a turbine loosely fitted into the housing and fixed to one end of the rotating shaft; a rotating atomizing head located outside the housing and fixed to the other end of the rotating shaft, one surface of which is a wetted surface; radial air bearings located around the rotating shaft and provided in the housing to support the rotating shaft in a non-contact manner; and radial air bearings located on both sides of the turbine to support the turbine in a non-contact manner. and a thrust air bearing provided in the housing, an outer cylinder is inserted into the rotating shaft in a non-contact state with respect to the rotating shaft, and an inner cylinder is inserted into the outer cylinder. The inside of the inner cylinder is used as a paint passage for supplying paint towards the liquid contact surface, and the space between the inner cylinder and the outer cylinder is used as an air passage for supplying shaping air towards the rotating atomizing head. An electrostatic spraying device characterized by: