JPH0833860A - Coating material feeder - Google Patents

Abstract

PURPOSE:To realize a coating material feeder with the structure simplified and capable of saving the energy to be consumed by the feeder. CONSTITUTION:A tank of coating material 1, an air plunger pump 2 and a coating material discharger 3 are connected with a coating material circulating pipe 4 to constitute a device A for sending the coating material under pressure. A temp. control water tank 5 provided with a heater 6, and the temp. control water passages 11 and 41 furnished to the tank 1 and a coating material circulating pipe 4b, are connected to provide a temp. control water circulating device B1. Further, a temp. control water passage 9 is furnished to the head of the pump 2, a second temp. control water circulating device B2 connecting the water passage 9 and the water tank 5 is provided, the freezing of the pump head is prevented by the heat exchange between the pump head with the temp. lowered by the adiabatic expansion of compressed air and the temp. control water, and the cooled temp. control water is returned to the tank 5 to make a cooler for the tank 5 needless.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paint supply device used for spray painting or sealing of a vehicle body, and more particularly to a paint pressure supply device having an air plunger pump in the paint supply passage.
The present invention relates to a paint supply device which is attached to the device and includes a temperature control water circulating device that adjusts the temperature of the paint.

[0002]

2. Description of the Related Art FIG. 6 shows a paint supply system using the above-mentioned paint supply device. A paint pressure feeding device A includes a paint tank 1, an air plunger pump 2, and a paint discharge device 3.
And a paint distribution pipe 4 connecting these in a loop shape, and the paint in the paint tank 1 is pressure-fed by the air plunger pump 2 to be discharged from the paint discharge device 3.

Further, the paint pressure-feeding device A is provided with a temperature control water circulating device B for adjusting the temperature of the paint in order to stabilize the discharge amount of the paint. That is, from the temperature control water tank 5 equipped with the heater 6 and the cooling device 7 to the paint tank 1
And the temperature control water channel 11 provided in the paint distribution pipe 4,
The water for temperature control is circulated at 41 using a water pump P to keep the paint at a predetermined temperature.

A heater 8 is attached to the air plunger pump 2. The air plunger pump 2 has a function of repeating a cycle in which a piston is moved up and down in the cylinder by high pressure air to suck and discharge the supplied paint. In this pump 2, the piston is lowered by the compressed air to reach the bottom dead center, and the compressed air is discharged when the piston rises again. At this time, the adiabatic expansion of the compressed air causes the air temperature to drop significantly,
The pump head may freeze. Therefore, a heater 8 is attached to the pump head to prevent the above freezing.

[0005]

As described above, in the conventional paint supply device, the air plunger pump is provided with the heater for preventing freeze of the pump head. Further, a heater 6 for heating the temperature control water for keeping the paint warm in the winter season, and a cooling device 7 for cooling the temperature control water for cooling the paint in the summer season are provided.

Therefore, the present invention realizes a paint supply device having a simplified structure which can prevent freezing of the pump head without using a heater and can cool the temperature control water without using a cooling device. Was made as an issue.

[0007]

As shown in FIG. 1, a paint tank 1, a paint discharge device 3 and an air plunger pump 2 provided between them are connected by a paint distribution pipe 4 to form a paint. The pressure feeding device A is configured. And the paint pump A
In addition, a temperature control water tank 5 equipped with a heater 6, a temperature control water channel 11 provided in the paint tank 1, and a paint distribution pipe 4
A paint supply device is constructed by additionally attaching a first temperature control water circulation device B1 which is connected to the temperature control water passage 41 provided in b.
The pump head 21 of the air plunger pump 2 is provided with a temperature control water passage 9, and a second temperature control water circulation device B2 is provided which connects the temperature control water passage 9 and the temperature control water tank 5. The temperature control water passage 9 of the pump head 21 is a pipe made of a material having a high thermal conductivity, and has a structure in which it is spirally wound around the surface of the pump head 21 as shown in FIG. Further, it is desirable that the pump head 21 is covered with a heat insulating cover 20.

[0008]

The paint in the paint tank 1 is sent to the paint discharge device 3 through the air plunger pump 2 and discharged, and the remaining paint is returned to the paint tank 1. On the other hand, the temperature control water is
The first temperature control water circulating device B1 causes the temperature control water tank 5 to return to the temperature control water tank 5 via the temperature control water channels 11 and 41. Further, the temperature adjusting water is supplied from the temperature adjusting water tank 5 to the air plunger pump 2 by the second temperature adjusting water circulating device B2.
It is refluxed to the temperature control tank 5 via the pump head 21.

In the pump head 21, heat is exchanged with the temperature adjusting water, and the pump head 21 is prevented from freezing. The temperature control water deprived of heat by the pump head 21 is returned to the temperature control water tank 5. Therefore, the cooling device for the temperature control water tank 5 can be omitted. Moreover, even if a cooling device is used, it is compact.

[0010]

Embodiments of the present invention will be described with reference to FIG.
As shown in FIG. 1, a paint tank 1, an air plunger pump 2, and a paint discharge device 3 such as a spray gun are connected in a loop by paint distribution pipes 4a and 4b to form a paint pressure feeding device A.

The paint pressure-feeding device A is provided with a first temperature control water circulating device B1 for keeping the temperature of the paint constant by the temperature control water in order to stabilize the amount of the paint discharged from the paint discharge device 3. I am doing it. The circulation device B1 has a temperature control water tank 5 and a paint tank 1 having a double structure, a temperature control water passage 11 formed between an inner wall and an outer wall thereof, and a paint distribution pipe 4b having a double structure having an inner wall. The temperature control water passage 41 formed between the outer wall and the outer wall is connected in a loop shape, and the temperature control water is circulated by the water pump P1 provided in the path. A heater 6 is provided in the temperature control water tank 5.

On the other hand, a temperature control water passage 9 is provided in the air plunger pump 2, and this is connected to the temperature control water tank 5 to form a second temperature control water circulating device B2, which is provided in the path. The water for temperature control is circulated by the water pump P2.

As shown in FIG. 2, the structure of the air plunger pump 2 includes a first cylinder 21 forming a pump head and a second cylinder 28 extending downward from the first cylinder 21. First cylinder 21
The upper chamber 21a and the lower chamber 21b are formed in the upper chamber 2a.
1a has an inner diameter larger than that of the lower chamber 21b. A first intake hole 211 that communicates with the upper chamber 21a is provided on the peripheral wall of the first cylinder 21, and the first intake hole 211 is connected to an air compressor (not shown) or the like and is supplied with compressed air.

Inside the first cylinder 21, a trip rod 23 is provided at the center from the top wall. Further, a piston 24 is provided which is guided by the trip rod 23 and is slidable in the vertical direction in the first cylinder 21. The piston 24 has a cylindrical shape, and the outer circumference of the cylinder is the upper chamber 21a and the lower chamber 21.
It is in sliding contact with the partition part of b, and the peripheral edge of the piston head 24a is in sliding contact with the inner surface of the upper chamber 21a. The piston head 24a has a plurality of second intake holes 241 formed on the outer periphery thereof. On the other hand, the first exhaust hole 24 is provided near the center of the piston head 24a.
2 is provided and communicates with the inside of the cylinder of the piston 24. A second exhaust hole 212 is provided at the lower end of the lower chamber 21b of the first cylinder 21.

These second intake hole 241 and first exhaust hole 24
An intake valve 25 and an exhaust valve 26 are provided in each of the two. The intake valve 25 opens and closes the second intake hole 241 from below,
The first intake hole 211 is opened and closed from above, and the exhaust valve 26 opens and closes the first exhaust hole 242 from above. The intake valve 25 and the exhaust valve 26 are connected to a vertically moving valve bar 27, and when the intake valve 25 closes the second intake hole 241, the exhaust valve 26 opens the first exhaust hole 242. Conversely, when the intake valve 25 opens the second intake hole 241, the exhaust valve 26 closes the first exhaust hole 242.

At the lower end of the second cylinder 28, the ball valve 2
The paint tank 1 is provided with the liquid suction hole 282 provided with 81.
(Fig. 1). Inside the second cylinder 28, a plunger 29 connected to the piston 24 is provided slidably in the vertical direction. A flange whose peripheral edge is in sliding contact with the inner wall of the second cylinder 28 is formed in the lower portion thereof, and the second cylinder 28 is connected to the upper chamber 28a and the lower chamber 2
It is divided into 8b. Further, at the lower end of the plunger 29, a first drainage hole 292 having a ball valve 291 is provided. On the other hand, a second drain hole 283 is provided in the upper part of the second cylinder 28 and is connected to the paint discharge device 3 (FIG. 1).

The first of the above air plunger pumps 2
The cylinder 21 is covered with a cover 20 having a heat insulating material 202 attached to the surface thereof.
The cooling chamber 201 is formed between the first outer wall and the outer wall. A ventilation hole is formed in the lower part of the cover 20 between the cover 20 and the first cylinder 21.

The outer wall of the upper chamber 21a of the first cylinder 21 forming the pump head is made of a material having a high thermal conductivity (for example,
A water pipe 9 for temperature control is provided in which a thin pipe made of a copper material or the like is spirally wound. The pipe forming the temperature control water passage 9 penetrates the cover 20 and the heat insulating material 202 on the surface thereof, and is connected to the temperature control water tank 5 (FIG. 1) via the water pump P2.

The operation of the paint supply device will be described with reference to FIGS. 1 to 5, focusing on the operation of the air plunger pump 2. As shown in FIG. 2, the intake valve 25 is connected to the second intake hole 24.
When the high pressure compressed air is supplied from the first intake hole 211 with the exhaust valve 26 opening the first exhaust hole 242, the piston 24 is raised. This allows
The plunger 29 inside the second cylinder 28 also rises, the pressure inside the second cylinder 28 falls, and the ball valve 281
Opens the first liquid suction hole 282, and the paint supplied from the paint tank 1 is sucked into the lower chamber 28b inside the second cylinder 28.

As shown in FIG. 3, the valve bar 27 has a first
When the piston 24 contacts the top wall of the cylinder 21 and the piston 24 reaches the top dead center, the exhaust valve 26 closes the first exhaust hole 242,
The intake valve 25 opens the second intake hole 241. The compressed air supplied from the first intake hole 211 is transferred to the second intake hole 241.
Enters the cylinder chamber above the piston 24, and the plunger 29 also descends as shown in FIG. Plunger 2
The lower chamber 28 inside the second cylinder 28 due to the lowering of 9
The pressure of the paint in b increases, the ball valve 282 is closed and the ball valve 291 is opened, the upper chamber 28a is reached via the first drain hole 292, the paint is discharged from the second drain hole 283, and the paint is discharged. It is supplied to the device 3.

When the valve bar 27 and the piston 24 are pushed down integrally and only the piston 24 is pushed further down due to the pressure difference between the inside of the first cylinder 21 and the atmosphere, as shown in FIG. 5, the first and second intake holes 211 are formed. , 241 are closed by the intake valve 25, the first exhaust hole 242 is opened, the high-pressure compressed air in the upper part of the first cylinder is discharged from the first and second exhaust holes 242, 212, and the pressure in the upper part of the first cylinder 21 is increased. Drops instantly. At this point, one cycle of piston movement is completed, and the compressed air supplied from the first intake hole 211 causes the piston 24 to rise as shown in FIG. In this way, the air plunger pump 2 repeats the cyclic motion to force the paint to be fed.

During the cycle motion of the air plunger pump 2 described above, when the pressure in the first cylinder upper chamber 21a shown in FIG. 5 decreases, the upper chamber 2 is adiabatically expanded by the compressed air.
There is a risk that the temperature inside 1a will drop and the pump head will freeze. The water for temperature adjustment is circulated by the water pump P2 in the second temperature adjustment water circulating device B2 including the temperature adjustment water passage 9 around the pump head, and heat exchange is performed between the temperature adjustment water and the pump head. That is, the pump head absorbs heat from the temperature adjusting water, and the pump head is prevented from freezing. The heat-controlled water that has been deprived of heat is returned to the temperature-controlled water tank 5.

The paint supply device of the present invention pressure-feeds the paint in the paint tank 1 to the paint discharge device 3 by the action of the air plunger pump 2 described above. Then, the first temperature control water circulating device B1 circulates the temperature control water in each of the paint tank 1 and the paint distribution pipe 4 to keep the paint at a predetermined temperature and stabilize the discharge amount. At the same time, the second circulating water for temperature control B2 prevents the pump head from freezing.
The cooling device for the temperature control water tank 5 can be omitted by returning the temperature control water that has been heat-cooled by the pop head. Even when the cooling device for the temperature control water tank 5 is provided for abnormally high temperatures in summer, the device may be smaller than the conventional one.

On the other hand, since the cooling chamber 201 is formed by the cover 20 provided on the pump head, the cooling effect of the temperature adjusting water can be enhanced and the operating noise of the air plunger pump 2 can be reduced.

[0025]

EFFECT OF THE INVENTION In the coating material supply device of the present invention, the heater for the air plunger pump is not needed by circulating the temperature control water around the pump head of the air plunger pump by the second temperature control water circulating device. Become. Moreover, the cooling device for the temperature control water tank can be omitted or downsized, so that the structure of the paint supply device can be simplified and the energy consumption of the device can be reduced.

[Brief description of drawings]

FIG. 1 is a system block diagram of a paint supply device of the present invention.

FIG. 2 is a cross-sectional view of the air plunger pump of the present invention and an operation diagram when the piston is raised.

FIG. 3 is an operation diagram of the air plunger pump, showing a time point when the piston reaches the top dead center.

FIG. 4 is an operation diagram of the air plunger pump showing the time when the piston is descending.

FIG. 5 is an operation diagram of the air plunger pump, showing a time point when the piston reaches the bottom dead center.

FIG. 6 is a system block diagram of a conventional paint supply device.

[Explanation of symbols]

 A paint pressure feed device B1 first temperature control water circulation device B2 second temperature control water circulation device P, P1, P2 water pump 1 paint tank 2 air plunger pump 20 cover 21 pump head (first cylinder) 201 cooling chamber 3 Paint discharge device 4 Paint distribution pipe 5 Temperature control water tank 9 Pump head temperature control water channel 11,41 Temperature control water channel

Claims (3)

[Claims] 1. A paint pressure-feeding device comprising a paint tank, a paint discharging device, and an air plunger pump provided between the paint tank and a paint circulating pipe, a temperature control water tank, and the paint tank. And a paint supply device provided with a temperature control water circulating device connected to the temperature control water channel provided in the paint distribution pipe, wherein a temperature control channel is provided in the pump head of the air plunger pump, and the temperature control channel is connected to the temperature control channel. A paint supply device comprising a second temperature control water circulating device which is connected to the temperature control water tank. 2. The paint supply device according to claim 1, wherein the temperature control water passage of the pump head has a structure in which a pipe made of a material having a high thermal conductivity is wound around an outer circumference of the pump head. 3. The paint supply device according to claim 2, wherein the pump head provided with the temperature control water passage is covered with a heat insulating material cover, and a cooling chamber for the temperature control water is formed in a gap between the cover and the pump head.