CN115780124A - Insulating paint metering device - Google Patents

Abstract

The invention discloses an insulating paint metering device, comprising: the motor driver is used for driving the metering pump to rotate; the sealing barrel is provided with a grounded conductor outer layer, and the inner layer of the sealing barrel is an insulating layer; the metal shell of the motor driver is electrically connected with the conductor outer layer; the metering pump is used for metering and pumping the water-based paint, and is arranged in the sealed barrel in a suspended manner through the insulating rod; an input shaft of the metering pump is connected with an output shaft of the motor driver through an insulated power shaft; the sealed barrel is provided with an insulation protection channel for water supply paint to pass through the input and output pipe. Compared with the prior art, the technical scheme of the invention can avoid creepage of the metering pump insulating device caused by environmental dust and moisture.

Description

Insulating paint metering device

Technical Field

The invention belongs to the field of electrostatic painting systems, and particularly relates to an improvement on an insulating structure of electrostatic painting equipment.

Background

Referring to fig. 1 in the field of manufacturing industrial products where electrostatic painting is required for many products, such as electrostatic painting processes using 80kV for bicycle frames, a paint atomizer 701 disposed in a painting booth 700 atomizes paint into micron-sized paint droplets by high pressure (hydraulic) or centrifugal means; meanwhile, the atomizer 701 is connected with a high-voltage device 702 (voltage) to pressurize the paint to 80kv, and simultaneously, the workpiece 703 is grounded, so that the electrified atomized paint can be adsorbed on the surface of the workpiece 703. In order to accurately meter the amount of paint used during the painting process, the paint in the paint tank 705 is continuously supplied to the atomizer 701 by the metering pump 704.

In the above system, the paint delivery line 706 is an insulated line, and although the paint is pressurized to 80kv on the atomizer 701, the paint solvent and paint resin and additive are insulated, and as the paint line is extended, the metering pump 704 and the paint tank 705 end are not charged by the connection of the paint atomizer 701.

However, as the market and policy demand for more environmentally friendly waterborne coatings increases, waterborne coating applications are also becoming more prevalent. The water-based paint has no VOC emission, improves the damage of coating to the environment, replaces the original solvent-based paint spraying, and is a novel paint actively promoted by the government and the world.

Aqueous coatings replace oil based coatings, but aqueous coatings are themselves good conductors. The existing electrostatic coating equipment must be replaced or upgraded so that the atomizer 701 can maintain a high electrostatic voltage for electrostatic coating. The method with low cost in the market at present is to insulate a coating system, so that the atomizer 701 cannot release high voltage electricity immediately due to the water-based coating, and the voltage of the original solvent-based high-resistance type coating can be maintained on the insulated atomizer 701, so that the water-based coating can also fully exert the characteristic of high coating efficiency of electrostatic spraying.

The insulation of the paint system is to insulate the paint bucket, the metering pump 704 and the paint pipe to keep a good high static voltage value of the atomizer 701, in recent years of the practice of the insulated electrostatic spraying system, the phenomena of electric leakage and electric jump of the metering pump 704 are found frequently, so that the high voltage value of the atomizer 701 is reduced, the electrostatic spraying efficiency is influenced, and the investigation reasons are mainly that the insulation device of the insulated metering pump 704 is affected with moisture and dust, particularly, when the humidity is high in rainy season, the static electricity is sharply reduced, the normal electrostatic spraying operation cannot be performed, and at this time, technicians need to blow off and wipe off the insulation device immediately to maintain the dryness and cleanness of the insulation device, so that the normal operation can be recovered.

The insulation metering pump 704 may creep as the usage environment changes. The insulated metering pump 704 comprises a motor driver 708, the motor driver 708 is connected with an input shaft of a pump body of the metering pump 704 through an insulated driving shaft 709, the pump body is connected to a water-based paint conveying pipeline, the conveying pipeline is connected with the atomizer 701, and the 80KV high-voltage electricity connected with the atomizer 701 enables the metering pump 704 to be electrified through the water-based paint in the pipeline. The motor driver 708 housing is grounded and as dust accumulates on the insulated drive shaft 709, the pump body discharges into the motor housing due to the dust and moisture, thereby creating a creepage. The creepage phenomenon may damage the equipment on the one hand, and on the other hand, creepage causes energy to be released through the bypass, and the voltage at the atomizer 701 end is reduced, so that the spraying efficiency of the coating material is reduced.

Disclosure of Invention

In order to solve the above problems, the present application provides a dustproof and moistureproof insulating paint metering device. This insulating paint metering device can prevent because the creepage that dust and humidity lead to, prevents because of the spraying efficiency decline and the equipment damage problem that creepage leads to.

Insulating paint metering device includes:

the motor driver is used for driving the metering pump to rotate;

the sealing barrel is provided with a grounded conductor outer layer, and the inner layer of the sealing barrel is an insulating layer;

the metal shell of the motor driver is electrically connected with the conductor outer layer;

the metering pump is used for metering and pumping the water-based paint, and is arranged in the sealed barrel in a suspended manner through the insulating rod;

an input shaft of the metering pump is connected with an output shaft of the motor driver through an insulated power shaft;

the sealed barrel is provided with an insulation protection channel for water supply paint to pass through the input and output pipe.

In a preferred embodiment of the present invention, the motor driver is disposed outside the sealed barrel, and the sealed barrel is provided with a first through hole; the first through hole is used for the output shaft of the motor driver to penetrate through the sealing barrel, so that the motor driver drives the metering pump.

In a preferred embodiment of the present invention, the outer layer of the sealed barrel comprises a metal barrel body and a metal end cover; the motor driver comprises a connecting plate connected with the metal end cover, the connecting plate is electrically connected with the metal end cover and fixed on the metal end cover, and the connecting plate covers the first via hole.

In a preferred embodiment of the present invention, the outer layer of the sealed barrel comprises a metal barrel body and a metal end cover; the motor driver is arranged in the sealed barrel and comprises a connecting plate connected with the metal end cover, and the connecting plate is electrically connected with the metal end cover and fixed on the metal end cover.

In a preferred embodiment of the present invention, the insulating rod comprises a first end connected to the metal end cap, and a second end connected to the metering pump; the metering pump comprises a pump body and a connecting plate, the pump body is fixed on the connecting plate, and the connecting plate is connected with the second end of the insulating rod.

In a preferred embodiment of the present invention, the insulation rod includes a first insulation rod, a second insulation rod, a third insulation rod, and a fourth insulation rod; the connecting plate is provided with a shaft hole, and an input shaft of the pump body is connected with the insulated power shaft through a transmission joint; the first insulating rod, the second insulating rod, the third insulating rod and the fourth insulating rod are arranged around the insulating power shaft.

In a preferred embodiment of the present invention, the length of the insulating rod is 150-500 mm.

In a preferred embodiment of the present invention, the metering pump and the insulating layer are kept at a safe distance from each other for preventing discharge.

In a preferred embodiment of the present invention, the insulating rod is a barrel-shaped structure, a first end of the barrel-shaped structure is connected to the metal end cover, and the metering pump is fixed at a second end of the barrel-shaped structure; and the insulated dynamic bearing penetrates through the inside of the barrel-shaped structure and is connected with the metering pump.

In a preferred embodiment of the present invention, the first end and the second end of the barrel structure respectively comprise a first bottom plate and a second bottom plate, the first bottom plate is connected with the end cover, and the second bottom plate is connected with the metering pump.

In a preferred embodiment of the present invention, the sealing barrel and the outer cover are made of metal (e.g., stainless steel).

Because the measuring pump sets up in sealed bucket to by the unsettled setting of insulator spindle in sealed bucket, set up the insulating layer in the sealed bucket simultaneously. The sealed bucket can prevent dust and moist air admission bucket's inside, the insulating layer in the sealed bucket and the unsettled design of pump body prevent the pump body is to sealed bucket conductor skin and motor driver shell discharge.

In the working process, paint is sucked into a sealed barrel from a paint barrel through the suction of a metering pump, and the water-based paint is metered by the metering pump in the sealed box and then directly sent to an atomizer through an output pipeline. Due to the design, the early damp and dust leakage of the traditional insulation metering pump are avoided. The problem of electric leakage is solved by the dehumidification device which is used for avoiding frequent cleaning and wiping in a rainy day.

Meanwhile, the sealing barrel is grounded to ensure the safety of the operation of workers. The body is grounded so that the body can be installed anywhere, and the water-based electrostatic painting can reduce psychological uneasiness of workers caused by high-voltage creepage.

Drawings

FIG. 1 is a schematic view of a prior art spray coating system.

Fig. 2 is a schematic view of the overall structure of the paint metering device of the present application.

FIG. 3 is a schematic view of a partial exploded structure of the paint metering device of the present application.

FIG. 4 is a schematic cross-sectional view of a paint metering device according to the present application.

FIG. 5 is a schematic view of the internal perspective of the paint metering device of the present application.

Fig. 6 is a schematic perspective view of a metering pump of the paint metering device of the present application.

FIG. 7 is a perspective view of the connection structure of the insulated power shaft of the paint metering device.

FIG. 8 is a schematic top view of an insulated power shaft connection of the paint metering device of the present application.

FIG. 9 is a schematic cross-sectional view of a second paint metering device according to an embodiment of the present application.

FIG. 10 is an exploded view of a three-paint metering device according to an embodiment of the present application.

FIG. 11 is a schematic cross-sectional view of a three-paint metering device according to an embodiment of the present application.

Detailed Description

The following embodiments are described in further detail with reference to the accompanying drawings so that those skilled in the art can understand the technical solutions of the present application, and it should be noted that the scope of the present application should be determined by the description of the claims.

Example one

Referring to fig. 2-4, the insulated paint metering device 100 of the present application includes: a motor driver 200 for driving the metering pump 400 to rotate; a sealed barrel 300 having a grounded conductor outer layer 301, the inner layer of the sealed barrel 300 being an insulating layer 302; the metal shell of the motor driver 200 is electrically connected with the conductor outer layer 301; the metering pump 400 for metering and pumping the paint, which is suspended in the sealed barrel 300 through the insulating rod 600; the input shaft of the metering pump 400 is connected with the output shaft 201 of the motor driver 200 through an insulated power shaft 402; the sealed barrel 300 is provided with an insulating protection passage 310 through which the water-supplying paint input pipe 306 and the water output pipe 307 pass.

The sealed barrel 300 is used for arranging the pump body 404 of the electrified metering pump 400 in the barrel in a suspended mode, so that the pump body 404 and the insulated power shaft 402 of the metering pump 400 are isolated from the external environment, dust and humid air cannot enter the sealed barrel 300, no dust exists between the insulated power shaft 402 and the pump body 404, creepage cannot occur, meanwhile, a safe discharge prevention distance d is formed by the suspended structure and the insulating layer 302 structure, and on the other hand, discharge is prevented by the insulating layer 302 and the grounded conductor outer layer in an isolated mode. The problem of reduced spraying efficiency caused by creepage is avoided, and meanwhile, psychological uneasiness of workers caused by the high-voltage creepage phenomenon is reduced due to the fact that the sealed barrel 300 isolates the high-voltage pump body 404.

Fig. 3 is a schematic view of the motor driver 200 of the paint metering device in a state of being separated from the sealing barrel 300, from which the structure of the motor driver 200 can be clearly seen.

The motor driver 200 is provided to drive the pump body 404 inside the hermetic container 300. Motor drive 200 is generally a cylindrical structure within which the motor of motor drive 200 is disposed, the motor being of conventional construction well known to those skilled in the art, and the motor drive may also include a speed reduction mechanism coupled thereto. The bottom of the motor driver 200 includes a connection plate 202, the connection plate 202 is provided with a connection hole 308 for fixing with the sealed barrel 300, and correspondingly, the sealed barrel 300 is provided with a connection hole 308 corresponding to the connection hole 308. Through the fixing member and the connection hole 308 while the connection plate 202 is electrically connected to the hermetic container 300, so that the motor driver 200 is grounded through the hermetic container 300.

Grounding of the motor driver 200 can release the induced electricity which may be generated by the motor in the high-voltage electric field.

In a preferred embodiment of the present invention, the connection plate 202 is connected to the sealing barrel 300 through a conductive screw and a mating conductive nut, and the screw and the mating conductive nut are electrically connected to the motor driver 200 and the sealing barrel 300 at the same time.

The motor driver 200 is arranged outside the sealed barrel 300, and the sealed barrel 300 is provided with a first through hole 309; the first through hole 309 allows the output shaft 201 of the motor driver 200 to pass through the sealing barrel 300, so that the motor drives the metering pump 400.

In a preferred embodiment of the present invention, a sealing gasket is disposed between the connection plate 202 and the sealed barrel 300, and the sealing gasket can prevent external air from entering the sealed barrel 300 through the through hole and the connection hole 308.

Fig. 4 isbase:Sub>A schematic sectional view of the sealing barrel 300 taken along the linebase:Sub>A-base:Sub>A in fig. 2.

The sealed barrel 300 isolates the external environment from the internal metering pump 400. A sealed barrel 300 having a grounded conductive outer layer 301, the inner layer of the sealed barrel 300 being an insulating layer 302. The outer layer of the sealed barrel 300 comprises a metal barrel body 304 and a metal end cover 305, wherein a first end of the metal barrel body is abutted against the metal end cover 305, and the metal end cover 305 is electrically connected with the metal barrel body.

In a preferred embodiment of the present invention, the length of the metal barrel is 300mm-700mm, and the diameter of the metal barrel is 150mm-400mm.

In a preferred embodiment of the present invention, the diameter of the metal barrel 304 is 200mm-250mm.

In a preferred embodiment of the present invention, the diameter of the metal barrel 304 is 200mm-210mm.

In a preferred embodiment of the present invention, the length of the metal barrel 304 is 400mm-600mm.

In a preferred embodiment of the present invention, the length of the metal barrel 304 is 450mm-580mm.

In a preferred embodiment of the present invention, the length of the metal barrel 304 is 560mm.

In a preferred embodiment of the present invention, the metal end cap 305 and the metal barrel 304 are made of stainless steel, and the metal end cap 305 and the metal barrel are connected by using a thread.

In a preferred embodiment of the present invention, the metal end cap 305 includes a sealing gasket therein, and the sealing gasket is compressed when the end of the metal barrel 304 is connected to the metal end cap 305, so as to prevent external air from entering the inside of the metal barrel 304.

The insulation layer 302 is used to isolate the metering pump 400 with high voltage inside the metal barrel body 304 from the external conductor outer layer. The outer diameter of the insulating layer 302 is substantially equal to the diameter of the inner layer of the conductor outer layer, and the insulating layer 302 can be mounted inside the conductor outer layer 301 by interference fit.

In a preferred embodiment of the present invention, the diameter of the insulating layer 302 is 150mm to 400mm.

In a preferred embodiment of the present invention, the thickness of the insulating layer 302 is 5-25mm, and the material of the insulating layer 302 is ceramic, resin, high molecular polymer, or other common high-voltage resistant materials known to those skilled in the art.

In a preferred embodiment of the present invention, the metal barrel may have a column structure known to those skilled in the art, such as a square column, a triangular column, an elliptical column, a polygonal column, etc., and the corresponding insulating layer 302 has the same shape as the metal barrel.

Fig. 5 shows the structure of the inside of the sealing bucket 300, which is a schematic structural view taken along the direction a-a in fig. 2. Fig. 6 hides the conductive inner layer of the sealed barrel 300 except for the end caps, and the insulating inner layer.

The metering pump 400 shown in fig. 4, 5, 6 and 7 is suspended in the sealed tub 300. The metering pump 400 comprises a pump body 404 and a connecting plate 405, wherein the pump body 404 is fixed on the connecting plate 405, and the connecting plate 405 is provided with an insulating rod 600 for fixation. The insulating rod 600 includes a first end connected to the end cap, and a second end connected to the connection plate 405; the connection plate 405 is connected to a second end of the insulation bar 600. Screw holes are provided in the connecting plate 405, through which a plurality of screws are passed. The insulating rods 600 are internally provided with a thread structure connected with screws, four insulating rods 600 are fixed on the connecting plate 405 through the screws, and the connecting plate 405 can be made of metal or plastic, such as a stainless steel plate. The metering pump 400 is arranged in the sealed barrel 300 in a suspended manner through the insulating rod 600, the metering pump 400 is not in contact with the four walls in the sealed barrel 300, a safety distance is kept, and the safety distance d is more than or equal to 40mm.

In a preferred embodiment of the present invention, the length of the insulation bar 600 is 150 to 500 mm.

In a preferred embodiment of the present invention, the number of the insulating rods 600 is 3 to 5.

In a preferred embodiment of the present invention, the metering pump 400 is a gear metering pump 400, and the gear metering pump 400 is of a construction well known to those skilled in the art. The metering pump 400 comprises an inlet 408 and an outlet 409 of water-based paint, the inlet and the outlet are respectively connected with the water-based paint input pipe 306 and the water-based paint output pipe 307, the water-based paint input pipe 306 and the water-based paint output pipe 307 are made of high-voltage insulating materials, and the input/output pipe 307 can directly ensure that the high-voltage electricity of the water-based paint with high voltage does not leak.

In order to further improve the high pressure resistance, the sealed barrel 300 is provided with an insulating protection channel 310 through which the water-supplying paint input pipe 306 and the water-supplying paint output pipe 307 pass. The insulating protection channel 310 is an insulating tube, the insulating tube penetrates through a through hole formed in a penetrating end cover, the insulating tube comprises an insulating nut structure 311, a hole for fixing a nut is formed in the metal end cover 305, and a through hole 312 is formed in the center of the nut and allows the water-based paint input and output pipes 307 to pass through.

Because the insulation protection channel 310 is arranged, two layers of insulation are arranged between the high-pressure water-based paint in the input and output pipeline 307 and the end cover, and the safety is higher.

In a preferred embodiment of the present invention, the insulating protection channel 310 is hermetically connected to the metal end cap 305, and the input/output pipe 307 is hermetically connected to the insulating protection channel 310, and the hermetic connection can prevent air, moisture, and dust outside the sealed barrel 300 from entering the sealed barrel 300.

With continued reference to fig. 5 and 6, the motor drive 200 and the metering pump 400 are connected by an insulated power shaft 402. The insulation rod 600 comprises a first insulation rod 601, a second insulation rod 602, a third insulation rod 603 and a fourth insulation rod 604; the connecting plate 405 is provided with a shaft hole 406, and an input shaft 407 of the pump body 404 is connected with the insulated power shaft 402 through a transmission joint 500; the first insulator rod 601, the second insulator rod 602, the third insulator rod 603, and the fourth insulator rod 604 are disposed around the insulated power shaft 402.

The insulated drive shaft has two functions, one of which is to transmit power, and the power of the motor is transmitted to the input shaft 407 of the metering pump 400 body through the insulated power shaft 402 when the motor driver 200 rotates. The insulated power shaft 402 can prevent high-voltage electricity on the pump body 404 from being transmitted to the shell of the motor through the insulated power shaft 402.

Referring to fig. 6, 7 and 8, the insulating rod 600 extends the insulating power shaft 402, the insulating power shaft 402 is made of a non-metal material, the concentricity of the insulating power shaft is lower than that of a metal shaft at the beginning of manufacturing, the strength of the insulating material is low, the concentricity may be reduced in the using process, the non-concentricity problem generated in the manufacturing process and the using process is increased by the extending structure, and the non-concentricity problem may cause abnormal vibration, inaccurate metering, and reduced service life of the metering pump 400.

Therefore, in order to solve the problem of non-concentricity of the insulated power shaft 402, the present application transmits a torsional force through the transmission joints 500 at two ends of the insulated power shaft 402, and the power input ends and the power output ends at two ends of the transmission joints 500 are in non-rigid connection, so that non-concentric rotation is allowed to prevent the non-concentric force from being transmitted to the pump body 404 of the metering pump 400.

Referring to fig. 7 and 8, a perspective structure schematic diagram and a top view of the metering pump 400 are shown, wherein the top view in fig. 8 includes a top view structure schematic diagram when the input shaft 501 of the transmission joint 500 is engaged with the output shaft 502.

The transmission joint 500 includes: an input shaft 501 connected with the insulated power shaft 402, a power output shaft 502 connected with an input shaft 407 of the metering pump, and a power transmission block 503 connected with the input shaft and the output shaft 502; the input shaft comprises a plurality of teeth 505 extending axially, the plurality of teeth 505 being circumferentially distributed about the edge of the input shaft; the output shaft 502 comprises a plurality of teeth 505 extending axially, and the teeth 505 are distributed circumferentially on the edge of the output shaft 502; the power shaft is axially embedded with a plurality of teeth 505 of the output shaft 502, the power shaft and the teeth of the output shaft 502 are distributed at intervals, and accommodating spaces 531 of the power transmission blocks 503 are reserved among the teeth;

the power transmission block 503 comprises radially distributed extension blocks 504, and the plurality of extension blocks 504 are arranged in the reserved accommodating space 531 of the power transmission block 503.

The number of extension blocks 504L = the number of input shaft power teeth M + the number of output shaft 502 power teeth N.

In a preferred embodiment of the invention, a gap is provided between the extension block 504 and the input shaft power teeth and output shaft 502 power teeth that allows the power input teeth and power output teeth to rotate non-concentrically.

Specifically, for example, the drive joint 500 includes: an input shaft 501 connected with the insulated power shaft 402, a power output shaft 502 connected with an input shaft 407 of the metering pump 400, and a power transmission block 503 connected with the input shaft 501 and the output shaft 502; the input shaft comprises a first tooth 511 and a second tooth 512 which axially extend, and the first tooth 511 and the second tooth 512 are circumferentially distributed on the edge of the input shaft 501; the output shaft 502 comprises a third tooth 513 and a fourth tooth 514 which axially protrude, and the third tooth 513 and the fourth tooth 514 are axially distributed on the edge of the output shaft 502; the first tooth 511 and the second tooth 512 of the power shaft are axially embedded with the third tooth 513 and the fourth tooth 514 of the output shaft 502, the first tooth 512 and the second tooth 512 are distributed with the third tooth and the fourth tooth alternately, and an accommodating space 531 of the power block 503 is reserved between the teeth

The power transmission block 503 comprises four extension blocks 504 distributed radially, and each extension block 504 is arranged in the reserved accommodating space 531 of the power transmission block 503. The extension block 504 provides clearance with the input shaft first and second teeth 511, 512 and the output shaft 502 third and fourth teeth 513, 514 that allows the power input and output teeth to rotate non-concentrically.

Due to the fact that the power block 503 is in non-rigid connection with the input shaft 501 and the output shaft 502, adaptive relative axial or radial deviation can occur among the input shaft 501, the output shaft 502 and the power block 503 when the power block rotates eccentrically, so that the insulated power shaft 402 can normally transmit power when the power block rotates eccentrically, and normal operation of the metering pump 400 is guaranteed.

With continued reference to fig. 7 and 8, the input shaft 501 is generally cylindrical, a mating hole 516 is formed in the middle of the input shaft, the main body of the mating hole 516 is a circular hole, the mating hole 516 is provided with a first plane 521 and a second plane 522, a plane 523 which is matched with the first plane 521 and the second plane 522 is formed on the input shaft, and the first plane 521 and the second plane 522 are used for insulating the power shaft 402 so as to transmit the rotating force to the input shaft 407 of the pump body 404.

The outer peripheral surfaces of the first teeth 511 and the second teeth 512 are on the same cylindrical surface as the outer peripheral surface of the input shaft. The planes of the first tooth 511 and the second tooth 512 are fan-shaped structures, and the surfaces 525 on both sides of the first tooth 511 and the second tooth 512 are respectively used for being matched with the surface of the extension block 504 of the power transmission block 503 to transmit power.

The whole output shaft 502 is cylindrical, the middle of the output shaft 502 is provided with a matching hole 516, the main part of the matching hole 516 is a circular hole, and the side surface of the circular hole is provided with a through hole 528 extending in the radial direction. The input shaft of the metering pump 400 is connected to the mating hole 516 after installation. A fixing screw (not shown) is fitted through the through hole, and the input shaft 501 and the output shaft 502 of the metering pump 400 are fixed by the fixing screw. The set screw can be dismantled in order to make things convenient for to disassemble the maintenance after the damage appears.

When the input shaft is axially embedded with the output shaft 502, the first, second, third and fourth teeth are distributed at intervals, and a matching block accommodating space 531 is formed between the first, third and fourth teeth 514; a receiving space 531 is formed between the second, third and fourth teeth. A cylindrical receiving space 531' is formed between the first, second, third and fourth teeth 514.

The center portion of the power block 503 is a cylindrical structure, which is received in the cylindrical receiving space 531' after installation, and the extension block 504 of the power block 503 extends outward from the center portion. The extension blocks 504 are disposed in the mating block receiving space 531 formed between the first and third and fourth teeth 514 and the receiving space 531 formed between the second and third and fourth teeth 514. The top view structure of the extension block 504 is a sector structure or a rectangular structure, the extension block 504 transmits power to the output shaft 502 when the input shaft 501 rotates, and the output shaft 502 transmits power to the input shaft 407 of the metering pump 400.

Example two

Referring to fig. 9, this embodiment is different from the first embodiment in that components such as a motor driver 200 and a metering pump 400 are completely disposed inside the hermetic container 300.

The outer layer of the sealed barrel 300 comprises a metal barrel 304 and a metal end cap 305; the motor driver 200 is disposed inside the sealed barrel 300, and the motor driver 200 includes a connection plate 202 connected to the metal end cap 305, and the connection plate 202 is electrically connected to the end cap and fixed thereto.

Specifically, the rear portion of the motor driver 200 is provided with a connection plate 202, the connection plate 202 is directly connected to the inner surface of the metal end cap 305 of the sealed tub 300, and the connection plate 202 is a conductor connecting the motor driver 200 housing and the conductor outer layer of the sealed tub 300. The metal cylinder 304 is grounded so that the housing of the motor driver 200 is grounded.

In a preferred embodiment of the present application, the end cap includes a hole for passing through the power line, and the hole is hermetically connected to the power line 315; the power line 315 supplies power to the motor driver 200 in the sealed barrel 300 to drive the metering pump 400 to rotate.

In this embodiment, the motor driver 200, the insulated power shaft 402 and the metering pump 400 are all completely disposed in the sealed barrel 300, so that higher dustproof and moistureproof effects can be obtained, and accordingly, a better creepage prevention effect can be obtained.

EXAMPLE III

The difference between the present application and the first and second embodiments is that the insulation rod 600 is replaced by an insulation barrel 800. The insulating rod 600 is replaced by a barrel-shaped structure 605 or a round tubular structure, a first end 606 of the barrel-shaped structure 605 is connected with the end cover, and the metering pump 400 is fixed at a second end 607 of the barrel-shaped structure 605; the insulated power shaft 402 bearing passes through the interior of the barrel 605 to connect with the metering pump 400.

The barrel structure 605 is arranged inside the insulating layer 302 of the sealed barrel, the input pipe 306 and the output pipe 307 for delivering the water-based paint are arranged inside the barrel structure 605, and the outside of the insulating layer 302 is arranged outside the barrel structure 605.

The barrel 605 serves two purposes, the first is to support the metering pump 400 to simplify the structure of the insulating rod 600 and the like. Secondly, an insulating layer 302 is added between the input pipe 306 and the output pipe 307 to further improve the insulating performance of the input pipe 306 and the output pipe 307.

Claims (10)

1. An insulating paint metering device, comprising:

the motor driver is used for driving the metering pump to rotate;

the sealing barrel is provided with a grounded conductor outer layer, and the inner layer of the sealing barrel is an insulating layer;

the metal shell of the motor driver is electrically connected with the conductor outer layer;

the metering pump is used for metering and pumping the water-based paint, and is arranged in the sealed barrel in a suspended manner through the insulating rod;

an input shaft of the metering pump is connected with an output shaft of the motor driver through an insulated power shaft;

the sealed barrel is provided with an insulation protection channel for water-supply paint input and output pipes to pass through.

2. The insulated paint metering device of claim 1, wherein the motor driver is disposed outside the sealed barrel, the sealed barrel being provided with a first via; the first through hole is used for the output shaft of the motor driver to penetrate through the sealing barrel, so that the motor driver drives the metering pump.

3. The insulated paint metering device of claim 2, wherein the outer layer of the sealed barrel comprises a metal cylinder and a metal end cap; the motor driver comprises a connecting plate connected with the metal end cover, the connecting plate is electrically connected with the metal end cover and fixed on the metal end cover, and the connecting plate covers the first via hole.

4. The insulated paint metering device of claim 1, wherein the outer layer of the sealed barrel comprises a metal cylinder and a metal end cap; the motor driver is arranged inside the sealed barrel and comprises a connecting plate connected with the metal end cover, and the connecting plate is electrically connected with the metal end cover and fixed on the metal end cover.

5. The insulated paint metering device of claim 3 or 4, wherein the insulated rod comprises a first end connected to the metal end cap, and a second end connected to a metering pump; the metering pump comprises a pump body and a connecting plate, the pump body is fixed on the connecting plate, and the connecting plate is connected with the second end of the insulating rod.

6. The insulated paint metering device of claim 6, wherein the insulating rod comprises a first insulating rod, a second insulating rod, a third insulating rod, and a fourth insulating rod; the connecting plate is provided with a shaft hole, and an input shaft of the pump body is connected with the insulated power shaft through a transmission joint; the first insulating rod, the second insulating rod, the third insulating rod and the fourth insulating rod are arranged around the insulating power shaft.

7. The insulated paint metering device of claim 7, wherein the length of the insulating rod is 150-500 mm.

8. The insulated paint metering device of claim 8, wherein the metering pump is maintained at a safe distance from the insulation layer from electrical discharge.

9. The insulated paint metering device of claim 3 or 4, wherein the insulated rod is a barrel-shaped structure, a first end of the barrel-shaped structure is connected with the metal end cover, and the metering pump is fixed at a second end of the barrel-shaped structure; and the insulated dynamic bearing penetrates through the inside of the barrel-shaped structure and is connected with the metering pump.

10. The insulated paint metering device of claim 9, wherein the first and second ends of the barrel structure comprise first and second base plates, respectively, the first base plate being connected to the end cap and the second base plate being connected to the metering pump.

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