JP2017056411A - Spray gun for electrostatic coating - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve an improvement in operability by reducing the weight of a high-voltage generator with no decrease in output of the high-voltage generator.SOLUTION: A spray gun for electrostatic coating comprises a nozzle for spraying a coating material, a high-voltage output part for electrifying the coating material sprayed out of the nozzle, and a high-voltage generator that supplies high voltage to the high-voltage output part. The high-voltage generator has a booster circuit that raises voltage inputted from outside, a case that stores the booster circuit, and an insulation part that has insulation properties and is provided in the case to cover the circumference of the booster circuit. The insulation part is constituted of a plurality of kinds of resin layers with different specific gravities.SELECTED DRAWING: Figure 4

Description

  Embodiments described herein relate generally to a spray gun for electrostatic coating.

  The weight of a spray gun for electrostatic painting (hereinafter referred to as a spray gun) has a great influence on the operability, that is, the handling property in the painting operation. Therefore, it is desirable that the spray gun be as light as possible. The spray gun includes a barrel portion and a grip portion that constitute a main body, a nozzle that forms a spray pattern of paint, a high voltage generator that generates a high voltage applied to the paint sprayed from the nozzle, and the like. Generally, in such spray guns, the weight of the high voltage generator is a large proportion of the total weight of the spray gun. Therefore, in order to reduce the weight of the entire spray gun, it is effective to reduce the weight of the high voltage generator.

  The high voltage generator has a booster circuit and the like inside the case. In order to ensure insulation inside the case, the case is filled with an insulating resin so as to cover the periphery of the booster circuit and the like. Therefore, by reducing the size of the booster circuit and reducing the volume of the case, the amount of resin filled in the case can be reduced, and as a result, the high voltage generator can be reduced in weight.

  However, in order to ensure safety, the booster circuit needs to secure a certain distance as an insulation distance between the input side that is low voltage and the output side that is high voltage. This insulation distance is determined by the voltage difference between the input voltage and the output voltage of the booster circuit. Therefore, in order to shorten the insulation distance, the output of the booster circuit must be lowered. However, reducing the output of the booster circuit lowers the voltage applied to the paint, leading to a reduction in the electrostatic coating effect. Under such circumstances, it has been difficult to reduce the size of the booster circuit while maintaining the output of the booster circuit and to reduce the weight of the high voltage generator.

JP 2008-161788 A

  Accordingly, there is provided an electrostatic coating spray gun which can reduce the weight of the high voltage generator without reducing the output of the high voltage generator and can improve the operability.

  The spray gun for electrostatic coating according to the embodiment includes a nozzle for spraying paint, a high voltage output unit for charging paint sprayed from the nozzle, and a high voltage for supplying a high voltage to the high voltage output unit. A voltage generator. The high-voltage generator includes a booster circuit that boosts an externally input voltage, a case that houses the booster circuit, and an insulating part that has insulation and covers the periphery of the booster circuit And having. The insulating part is composed of a plurality of types of resin layers having different specific gravities.

The figure which shows typically an example of the electrical structure of the spray gun for electrostatic painting about 1st Embodiment The figure which shows an example of the mechanical structure of the spray gun for electrostatic painting about 1st Embodiment The perspective view which shows the external appearance of a high voltage generator about 1st Embodiment Sectional drawing which shows the inside of a high voltage generator about 1st Embodiment The figure which shows an example of a structure around the output resistance of a high voltage generator about 1st Embodiment The figure which shows the other example of a structure around the output resistance of a high voltage generator about 1st Embodiment. Sectional drawing which shows the inside of a high voltage generator about 2nd Embodiment

  Hereinafter, a plurality of embodiments according to a spray gun for electrostatic coating will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected to the substantially same element in each embodiment, and description is abbreviate | omitted.

(First embodiment)
A first embodiment will be described with reference to FIGS. First, the electrical configuration of the electrostatic coating spray gun 10 (hereinafter referred to as spray gun 10) of this embodiment will be described with reference to FIG. As shown in FIG. 1, the spray gun 10 includes a main body 11, a paint valve 12, an air valve 13, a paint path 14, an air path 15, a nozzle 16, a trigger 17, a high voltage output unit 18, and a high voltage generator 20. ing.

  The paint valve 12 and the air valve 13 are opened by pulling the trigger 17. The paint valve 12 is connected to the paint pump 91 and the paint tank 92 via the paint path 14. A liquid or powder paint is stored in the paint tank 92. The paint in the paint tank 92 is supplied to the paint valve 12 through the paint path 14 by the paint pump 91. The paint path 14 is configured by, for example, a synthetic resin hose having electrical insulation. The air valve 13 is connected to the compressor 93 via the air path 15. The compressed air generated by the compressor 93 is supplied to the air valve 13 through the air path 15.

  The nozzle 16 is for spraying paint in a predetermined pattern, and is provided at the tip of the main body 11. Although not shown in detail in the inside of the nozzle 16, a paint supply port, an atomizing air hole, and a pattern forming air hole are provided. When the paint valve 12 and the air valve 13 are opened by pulling the trigger 17, the paint is supplied to the nozzle 16 through the paint path 14 and the paint valve 12, and also through the air path 15 and the air valve 13. Compressed air is supplied. The coating material supplied to the nozzle 16 is atomized by the compressed air discharged from the atomizing air holes and sprayed by being formed into a shape suitable for coating, that is, a coating pattern, by the compressed air discharged from the pattern forming air holes. Is done.

  The high voltage generator 20 outputs a DC high voltage proportional to the input AC voltage. In the present embodiment, the high voltage generator 20 boosts an input voltage input from the outside to about 5000 to 6000 times and outputs the boosted voltage. The spray gun 10 is cable-connected to an electrostatic controller (not shown). An electrostatic controller (not shown) supplies an alternating voltage to the spray gun 10.

  The high voltage generator 20 includes an input transformer 21, a booster circuit 22, and an output resistor 23. The input side, that is, the primary side of the input transformer 21 is connected to an external electrostatic controller. The output side, that is, the secondary side of the input transformer 21 is connected to the input side, that is, the low voltage unit 221 of the booster circuit 22 by, for example, a metal wire. The input transformer 21 electrically insulates between the external electrostatic controller and the booster circuit 22, and outputs the AC voltage Vac supplied from the external electrostatic controller to the low voltage unit 221 of the booster circuit 22.

  The step-up circuit 22 is configured by a Cockcroft-Walton type step-up rectifier circuit, for example. The booster circuit 22 boosts and rectifies the AC voltage input from the input transformer 21 to convert it into a DC high voltage. The output side of the booster circuit 22, that is, the high voltage unit 222 is connected to the output resistor 23 by metal, for example.

  The output resistor 23 is a resistor configured in a plate shape, for example, and is provided between the high voltage unit 222 and the high voltage output unit 18 of the booster circuit 22. The DC high voltage output from the booster circuit 22 is supplied to the high voltage output unit 18 via the output resistor 23 and is output from the high voltage output unit 18 as a DC output voltage Vdc. The high voltage output unit 18 is formed of, for example, a pin-shaped metal electrode, and is provided in the vicinity of the nozzle 16. Thereby, the direct-current output voltage Vdc output from the high voltage output unit 18 is applied to the fine particles of the paint sprayed from the nozzle 16.

  In the case of this embodiment, an electrostatic controller (not shown) supplies, for example, an AC voltage of 12V to 20V to the primary side of the input transformer 21 of the spray gun 10. The input transformer 21 converts the AC voltage supplied from the electrostatic controller into an AC voltage of about 2 kV to 4 kV on the secondary side, and inputs the AC voltage to the booster circuit 22. The booster circuit 22 boosts the AC voltage supplied from the input transformer 21 to a DC voltage of 60 kV to 100 kV and supplies the boosted voltage to the high voltage output unit 18. The high voltage output unit 18 outputs the high voltage supplied from the high voltage generator 20 to the vicinity of the nozzle 16 and charges the paint sprayed from the nozzle 16 to a high voltage. Thereby, electrostatic coating is performed on the workpiece 100.

  The booster circuit 22 can set the polarity of the output voltage to either positive or negative with respect to the ground potential by changing the direction of a diode (not shown) in the circuit. For example, the polarity of the output voltage of the booster circuit 22 is configured to be negative with respect to the ground potential. In this case, the finely divided paint is charged with a negative polarity. In the present specification, the value of the output voltage Vdc is expressed as an absolute value for the sake of convenience without distinguishing between positive and negative.

Next, the mechanical configuration of the spray gun 10 will be described with reference to FIGS.
As shown in FIG. 2, the main body 11 constitutes an outer shell of the spray gun 10. The main body 11 is made of, for example, a synthetic resin such as polyacetal resin or fluorine resin having electrical insulation. The main body 11 is a handgun type, that is, a hand gun type as a whole, and has a barrel portion 111 and a grip portion 112. The user can operate the spray gun 10 while holding the grip portion 112. The nozzle 16 is provided at the tip of the barrel portion 111. The paint path 14 and the air path 15 enter the main body 11 from the lower end portion of the grip portion 112 and pass to the vicinity of the nozzle 16 at the tip portion of the barrel portion 111.

  In the description of the present embodiment, the longitudinal direction of the barrel portion 111 is the front-rear direction of the spray gun 10 as indicated by the front and rear arrows in FIG. In this case, with respect to the longitudinal direction of the barrel portion 111, the front end side of the barrel portion 111 is the front side of the spray gun 10, and the connection portion side between the barrel portion 111 and the grip portion 112 is the rear side of the spray gun 10. Further, as shown by the up and down arrows in FIG. 2, the direction perpendicular to the front-rear direction of the spray gun 10 is the up-down direction of the spray gun 10.

  The high voltage generator 20 is provided inside the barrel portion 111. Therefore, the grip portion 112 is disposed at a position different from the high voltage generator 20. The outer shell of the high voltage generator 20 is constituted by a case 24 as shown in FIG. The case 24 is made of, for example, a synthetic resin such as polyacetal resin or fluorine resin having electrical insulation. As shown in FIGS. 3 and 4, the case 24 is formed in a container shape that is elongated in the front-rear direction as a whole and has an entire lower surface opened. In the following description, the direction perpendicular to the bottom surface portion 241 of the case 24, that is, the vertical direction shown in FIG.

  As shown in FIG. 4, the input transformer 21, the booster circuit 22, and the output resistor 23 are accommodated in the case 24. That is, as shown in FIGS. 3 and 4, the case 24 integrally includes an input transformer housing portion 242, a booster circuit housing portion 243, and an output resistance housing portion 244. As shown in FIG. 4, the input transformer 21 is accommodated in the input transformer accommodating portion 242. The booster circuit 22 is housed in the booster circuit housing portion 243. The output resistor 23 is accommodated in the output resistance accommodating portion 244.

  Here, as shown in FIGS. 3 and 4, the width, depth, length, and volume of the input transformer accommodating portion 242 are defined as a width W1, a depth H1, a length L1, and a volume V1, respectively. Further, the width, depth, length, and volume of the booster circuit accommodating portion 243 are defined as a width W2, a depth H2, a length L2, and a volume V2, respectively. The width, depth, and length of the output resistance accommodating portion 244 are defined as a width W3, a depth H3, a length L3, and a volume V3, respectively.

  In this case, as shown in FIG. 3, the width of each of the accommodating portions 242 to 244 is set to W1 = W2> W3. Moreover, as shown in FIG. 4, the depth of each accommodating part 242-244 is set so that it may become H1> H2> H3. The lengths of the accommodating portions 242 to 244 are set so as to satisfy L2> L3> L1. And the volume of each accommodating part 242-244 is set so that it may become V2> V1> V3.

  Moreover, the high voltage generator 20 has the insulation part 25, as shown in FIG. The insulating portion 25 is obtained by filling a case 24 with an insulating resin, for example, a thermosetting mold resin, and solidifying the resin. The insulating unit 25 covers the periphery of the input transformer 21, the booster circuit 22, and the output resistor 23 housed in the case 24.

  The insulating part 25 is composed of a plurality of types of resin layers having different specific gravities. In the case of this embodiment, the insulating part 25 is constituted by two types of resin layers, that is, a first resin layer 251 and a second resin layer 252. The first resin layer 251 and the second resin layer 252 are formed so as to overlap in the depth direction of the case 24. In this case, the first resin layer 251 is provided on the bottom surface portion 241 side in the case 24. The second resin layer 252 is provided in the case 24 on the side opposite to the bottom surface portion 241, that is, on the opening side of the case 24.

  The first resin layer 251 and the second resin layer 252 are, for example, epoxy-based and two-component mixed type thermoplastic resins. The first resin layer 251 has a lower specific gravity than the second resin layer 252. For example, the specific gravity of the first resin layer 251 is set to 1.0 to 1.2 at 25 ° C. For example, the specific gravity of the second resin layer 252 is set to 1.6 to 1.8 at 25 ° C. The second resin layer 252 is disposed on the lower portion of the high voltage generator 20 with respect to the first resin layer 251, that is, at a position closer to the grip portion 112 with respect to the first resin layer 251. That is, the insulating portion 25 is configured such that the specific gravity increases as the resin layer is located closer to the grip portion 112 side.

In the case of this embodiment, the boundary surface 253 between the first resin layer 251 and the second resin layer 252 is not located at the high voltage portion 222 portion of the output resistor 23 and the booster circuit 22.
In the present embodiment, the low voltage part 221 and the high voltage part 222 of the booster circuit 22 are located on the lower surface side of the booster circuit 22, that is, on the opposite side to the bottom surface part 241 of the case 24, as shown in FIG. . The boundary surface 253 is positioned above the high-voltage portion 222 of the output resistor 23 and the booster circuit 22, that is, on the bottom surface portion 241 side. In other words, the output resistor 23 and the high voltage part 222 of the booster circuit 22 are configured not to contact the resin layers of the first resin layer 251 and the second resin layer 252 without crossing the boundary surface 253. . In other words, the output resistor 23 and the high voltage portion 222 of the booster circuit 22 are covered with one type of resin layer, in this case, the second resin layer 252 having a higher specific gravity than the first resin layer 251.

  The high voltage generator 20 is assembled as follows, for example. That is, first, the operator holds the case 24 in a state where the bottom surface portion 241 of the case 24 is positioned on the lower side, that is, in a state where FIG. Next, the operator arranges the input transformer 21, the booster circuit 22, and the output resistor 23 in the case 24, and between the input transformer 21 and the booster circuit 22 and between the booster circuit 22 and the output resistor 23. Connect electrically with metal wires. Next, the worker fills the case 24 in a liquid state with the resin constituting the first resin layer 251 and heats and cures the liquid resin to form the first resin layer 251. . Thereafter, the worker fills the case 24 with the resin constituting the second resin layer 252 in a liquid state so as to overlap the first resin layer 251. Then, the second resin layer 252 is formed by heating and curing the liquid resin. As a result, a plurality of layers, in this case, an insulating portion 25 having a two-layer structure is formed, and the high voltage generator 20 is completed.

  According to the embodiment described above, the high voltage generator 20 includes the booster circuit 22, the output resistor 23, the case 24, and the insulating unit 25. The insulating unit 25 has an insulating property and is provided in the case 24 so as to cover the periphery of the booster circuit 22 and the output resistor 23. Here, the inventors of the present application focused on the fact that the insulating performance of the insulating portion 25 is proportional to the specific gravity of the resin constituting the insulating portion 25. That is, the insulation performance of the insulating portion 25 is improved as the specific gravity of the resin constituting the insulating portion 25 increases. In other words, the insulation performance of the insulating portion 25 is reduced as the specific gravity of the resin constituting the insulating portion 25 decreases. That is, if the specific gravity of the insulating part 25 is reduced in order to reduce the weight of the high voltage generator 20, the insulating performance of the entire insulating part 25 is also deteriorated.

  Therefore, in the present embodiment, the insulating portion 25 includes a plurality of types of resin layers having different specific gravities, in this case, the first resin layer 251 and the second resin layer 252. For example, the insulating portion 25 includes a second resin layer 252 having an insulating performance equivalent to that of the prior art, and a first resin layer 251 that is inferior in insulating performance to the second resin layer 252 but has a small specific gravity and is light. Yes. According to this, since the periphery of the booster circuit 22 and the output resistor 23 is covered and insulated by the insulating portion 25, the insulation around the booster circuit 22 and the output resistor 23 can be ensured as in the conventional configuration. it can.

  Furthermore, according to this embodiment, by using together the 1st resin layer 251 lighter than the 2nd resin layer 252, compared with what comprised the whole insulating part 25 with the 2nd resin layer 252, the insulating part 25 is made. The weight can be reduced. That is, the high voltage generator 20 can be reduced in weight. Thereby, weight reduction of the high voltage generator 20 can be achieved without reducing the output of the booster circuit 22. As a result, the operability of the spray gun 10 can be improved while maintaining the output of the high voltage generator 20.

  The high voltage generator 20 is provided in the barrel portion 111 which is a position different from the grip portion 112 in the main body 11, that is, a position away from the grip portion 112. The weight of the high voltage generator 20 occupies a relatively large proportion in the spray gun 10. Therefore, the weight of the high voltage generator 20 has a great influence on the position of the center of gravity of the spray gun 10. That is, as the weight of the high voltage generator 20 increases, the position of the center of gravity of the spray gun 10 approaches the high voltage generator 20. In this case, if the high voltage generator 20 is provided at a position away from the grip portion 112, the position of the center of gravity of the spray gun 10 is away from the grip portion 112, and as a result, the operability of the spray gun 10 is lowered. . In particular, in a posture in which the spray gun 10 is inclined, that is, in a posture in which the position of the center of gravity of the spray gun 10 is not located above the grip portion 112, the operability is likely to be further deteriorated.

  Therefore, in the present embodiment, the specific gravity of the insulating portion 25 increases as the resin layer is located closer to the grip portion 112 side. That is, in the insulating part 25, the second resin layer 252 on the grip part 112 side has a higher specific gravity than the first resin layer 251 on the opposite side of the grip part 112. According to this, in the high voltage generator 20, the grip part 112 side can be made heavier, and the gravity center position of the spray gun 10 can be brought close to the grip part 112 side. As a result, even if the high voltage generator 20 is provided at a position away from the grip portion 112, the operability of the spray gun 10, particularly the operability in a posture in which the spray gun 10 is tilted can be improved. it can.

  In the insulating portion 25, the boundary surface between the plurality of resin layers, in this case, the boundary surface 253 between the first resin layer 251 and the second resin layer 252 is not chemically bonded. Therefore, when a high voltage is applied to the boundary surface 253, the first resin layer 251 and the second resin layer 252 are separated from each other, and the periphery of the boundary surface 253 may break down. Therefore, in the present embodiment, the high voltage unit 222 and the output resistor 23 of the booster circuit 22 are surrounded by one type of resin layer, in this case, the second resin layer 252 as shown in FIG. In other words, the high voltage section 222 and the output resistor 23 of the booster circuit 22 that becomes a high voltage are not provided across the two resin layers 251 and 252. In other words, the boundary surface 253 between the first resin layer 251 and the second resin layer 252 is not located around the high voltage portion 222 and the output resistor 23 of the booster circuit 22 that becomes a high voltage.

  According to this, it is possible to prevent a high voltage around the high voltage unit 222 and the output resistor 23 of the booster circuit 22 from being applied to the boundary surface 253. Thereby, it can avoid that the 1st resin layer 251 and the 2nd resin layer 252 separate, and the insulation performance of the insulation part 25 falls, As a result, the insulation performance of the insulation part 25 is made into a high state. Can be maintained.

  The insulating portion 25 is formed by overlapping a plurality of types of resin layers having different specific gravities, in this case, a first resin layer 251 and a second resin layer 252 in the depth direction of the case 24. According to this, when manufacturing the high voltage generator 20, the operator fills the case 24 with two kinds of resins in order with the bottom surface portion 241 of the case 24 facing downward, and cures it. The insulating part 25 can be formed. This manufacturing process is only an increase in the number of types of resin filled in the case 24 compared to the conventional manufacturing process. Therefore, according to the present embodiment, it is possible to manufacture the high voltage generator 20 having the multi-layered insulating portion 25 without greatly changing the conventional manufacturing process. As a result, an increase in manufacturing cost due to the insulating portion 25 having a multi-layer structure can be suppressed.

  As shown in FIG. 6, the insulating unit 25 may be configured to cover the periphery of the booster circuit 22 and the output resistor 23 with a first resin layer 251. That is, in this case, the boundary surface 253 is located below the output resistor 23 and the booster circuit 22, that is, on the opposite side to the bottom surface portion 241. Also by this, the same operation effect as the above-mentioned embodiment is obtained.

(Second Embodiment)
Next, a second embodiment will be described with reference to FIG.
In the first embodiment, in the first embodiment, the insulating portion 25 is formed by overlapping two types of resin layers 251 and 252 having different specific gravities in the depth direction of the case 24. In contrast, the insulating portion 26 of the second embodiment is formed by overlapping a plurality of types of resin layers 261, 262, and 263 having different specific gravities in the longitudinal direction of the case 24, that is, the front-rear direction of the spray gun 10. ing.

  Specifically, as shown in FIG. 7, the high voltage generator 20 of the second embodiment has an insulating portion 26 instead of the insulating portion 25 of the first embodiment. The insulating portion 26 is formed by three types of resin layers having different specific gravities, that is, a first resin layer 261, a second resin layer 262, and a third resin layer 263. In the present embodiment, the case 24 has a first partition 245 and a second partition 246. The first partition 245 and the second partition 246 may be integrated with the case 24 or may be separate. The first partitioning portion 245 is provided in the case 24 near the input transformer housing portion 242 of the booster circuit housing portion 243 and partitions the inside of the case 24 in the longitudinal direction, that is, the front-rear direction. The second partitioning portion 246 is provided in the case 24 near the output resistance housing portion 244 of the booster circuit housing portion 243, and partitions the inside of the case 24 in the longitudinal direction, that is, the front-rear direction.

  The first resin layer 261 is provided between the first partition 245 and the second partition 246 in the case 24. The second resin layer 262 is provided behind the first partitioning portion 245 in the case 24. The third resin layer 263 is provided in front of the second partition 246 in the case 24. And each resin layer 261,262,263 is set so that specific gravity may become large in order of the 1st resin layer 261, the 2nd resin layer 262, and the 3rd resin layer 263. That is, the resin layers 261, 262, and 263 have high insulation performance in the order of the third resin layer 263, the second resin layer 262, and the first resin layer 261.

  Here, the insulation performance, that is, the withstand voltage required in the case 24 of the high voltage generator 20 differs depending on the position in the case 24. That is, since the high voltage part 222 of the output resistor 23 and the booster circuit 22 generates a high voltage of 60 kV to 100 kV, higher insulation is required. On the other hand, the peripheral voltage of the input transformer 21, the low voltage part 221 of the booster circuit 22, and the central peripheral part of the booster circuit 22 are lower in voltage than the output resistor 23 and the high voltage part 222 of the booster circuit 22. Therefore, it is only necessary to have a medium insulating property.

  Therefore, in the present embodiment, the tip end side of the high voltage generator 20, that is, the output resistor 23 and the high voltage portion 222 of the booster circuit 22 are covered with a third resin layer 263 that has high specific gravity but high insulation performance. Yes. The base end side of the high voltage generator 20, that is, the low voltage part 221 of the input transformer 21 and the booster circuit 22 is covered with a second resin layer 262 that is lighter than the third resin layer 263 and has a moderate insulation performance. Yes. The central portion of the booster circuit 22 is covered with a first resin layer 262 that is lighter than the second resin layer 262.

  According to this, the same effect as the first embodiment can be obtained. Furthermore, the capacity of the third resin layer 263 having high insulation performance but high specific gravity can be further reduced. Thereby, the high voltage generator 20 can be further reduced in weight while ensuring sufficient insulation performance. That is, the high voltage generator 20 can be further reduced in weight without reducing the output of the booster circuit 22. As a result, the operability of the spray gun 10 can be further improved while maintaining the output of the high voltage generator 20.

  Further, according to this, the volume of the third resin layer 263 is reduced as much as possible to lighten the tip side of the high voltage generator 20, and the volume of the second resin layer 262 is increased as much as possible to increase the voltage of the high voltage generator 20. The base end side of can be made heavy. That is, the center of gravity of the high voltage generator 20 can be brought closer to the input transformer 21 side, that is, the grip portion 112 side. Thereby, the gravity center position of the spray gun 10 can be brought closer to the grip portion 112, and as a result, the operability of the spray gun 10 can be further improved.

In addition, the kind of resin layer demonstrated in the said embodiment, the number of layers, specific gravity, etc. are not restricted to the thing of the said embodiment.
The embodiments of the present invention are not limited to the above-described embodiments shown in the drawings, and can be implemented with appropriate modifications without departing from the spirit of the invention.

  In the drawing, 10 is a spray gun for electrostatic coating, 112 is a grip part, 18 is a high voltage output part, 20 is a high voltage generator, 22 is a booster circuit, 24 is a case, 25 is an insulating part, and 251 is a first resin. Layer (resin layer), 252 is a second resin layer (resin layer), 26 is an insulating portion, 261 is a first resin layer (resin layer), 262 is a second resin layer (resin layer), and 263 is a third resin layer (Resin layer) is shown.

Claims (5)

A nozzle for spraying paint;
A high-voltage output unit for charging the paint sprayed from the nozzle;
A high voltage generator for supplying a high voltage to the high voltage output unit,
The high voltage generator is
A booster circuit that boosts an externally input voltage;
A case housing the booster circuit;
And having an insulating portion provided in the case and covering the periphery of the booster circuit,
The insulating part is constituted by a plurality of types of resin layers having different specific gravities,
Spray gun for electrostatic painting. A grip portion that is arranged at a position different from the high voltage generator and can be gripped by the user;
The insulating part has a greater specific gravity as the resin layer is closer to the grip part side.
The spray gun for electrostatic coating according to claim 1. The high voltage side of the booster circuit is surrounded by one type of resin layer.
The spray gun for electrostatic coating according to claim 1 or 2. The insulating part is formed by overlapping a plurality of types of resin layers having different specific gravities in the depth direction of the case,
The spray gun for electrostatic coating according to any one of claims 1 to 3. The insulating portion is formed by overlapping a plurality of types of resin layers having different specific gravities in the longitudinal direction of the case.
The spray gun for electrostatic coating according to any one of claims 1 to 3.

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