JPH0346868Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention is a constant pressure feeding device (hereinafter referred to as
(referred to as a constant pressure pumping device). More specifically, the present invention relates to a constant-pressure feeding device that supplies high-viscosity coating agents such as soundproofing paint and sealants to a terminal flow gun in a painting line for automobile bodies and the like.

[Prior Art] Conventionally, in painting lines for automobile bodies, etc., constant pressure feeding devices have been used to supply high viscosity coating agents such as soundproof paints, anti-pitting paints, or sealants to flow guns at terminals.

Conventional constant pressure pumping devices include, for example, a dead end type as shown in FIG. 3, and a circulating type as shown in FIG. 4.

The dead end method shown in Figure 3 is
A pressure feed pipe line 2 for supplying a high viscosity coating agent to each flow gun 1 is connected at one end to a pressure pump 3 and closed at the other end. The high viscosity coating agent discharged from the pressure pump 3 passes through the pressure feed line 2 to its terminal, and is supplied to the flow gun 1 along the way.

The circulating system shown in FIG. 4 is one in which one end of the pressure feed line 2 is connected to the pressure feed pump 3, and the other end is connected to the pressure feed tank 4 via the on-off valve 9. The high viscosity coating agent discharged from the pressure pump 3 is sent to the on-off valve 9 through the pressure feed pipe 2, and on the way, the flow guns 1a, 1
A high viscosity coating agent is supplied to b.

[Problems to be Solved by the Invention] When using the dead-end method, there is a problem in that the high viscosity coating agent remains in the terminal portion 2a of the pressure-feeding pipe 2 and cannot be used.

Further, when using the above-mentioned circulating system, there is a problem that pressure loss due to piping resistance etc. increases while the high viscosity coating agent discharged from the pressure pump 3 makes one round in the pressure feed pipe line 2. The degree of pressure loss varies depending on the length, thickness, shape, temperature, etc. of the pipe, but for example, if the supply pressure supplied to the flow gun 1a near the pressure pump 3 is 120 kg/
cm ² , the supply pressure supplied to the flow gun 1b near the pressure-feeding tank 4 may be less than 60 kg/cm ² , and particularly in winter, high-viscosity coating agents may not come out.

Therefore, since the amount of high-viscosity coating agent discharged differs depending on each flow gun, there is a problem that workability is poor and the finished quality of the coated surface is poor.

In view of the above-mentioned circumstances, the present invention has been developed to prevent high viscosity coating agent from being left unused, to improve the workability of the coating process using flow guns installed at various points in the pressure-feeding pipeline, and to obtain a good finish quality. The present invention provides a constant pressure feeding device comprising:

[Means for solving the problem] The constant pressure feeding device of the present invention includes a loop-shaped pressure feeding pipe 2, a supply pipe 5 connected between the pressure feeding pipe 2 and the pressure pump 3, and a pressure feeding pipe. Channel 2 and pressure tank 4
a discharge pipe line 6 connected between the
A supply connection portion 5 to which the supply pipe line 5 is connected.
a discharge connection portion 6 where the discharge pipe line 6 is connected to
A first on-off valve 7 interposed in one line between a and a second on-off valve 8 interposed in the other line.
, a third on-off valve 9 interposed in the discharge pipe 6, at least one flow gun 1a connected between the supply connection portion 5a and the second on-off valve 8, and the discharge connection portion 6a. It is characterized in that it consists of at least one flow gun 1b connected between the second on-off valve 8 and the second on-off valve 8.

[Operation] When using the constant pressure pressure feeding device of the present invention, by combining the opening and closing of the first on-off valve, the second on-off valve, and the third on-off valve, it can be used as either a dead-end method or a circular tote method.

That is, when the first on-off valve is opened and the second on-off valve and the third on-off valve are closed, the discharge pipe is closed, and the pressure feeding pipe is also closed by the second on-off valve in the middle thereof. Therefore, the high-viscosity coating agent discharged from the pressure pump is divided into two parts in the pressure-feeding conduit from a portion connected to the supply conduit, and is forced-fed to the intervening position of the second on-off valve. In this case, the pressure-feeding pipeline functions as if it were equipped with two systems of dead-end pressure-feeding pipelines.

Next, close the first on-off valve and the third on-off valve,
When the second on-off valve is opened, the high-viscosity coating agent discharged from the pressure pump goes around the pressure-feeding pipeline through the second on-off valve and is forced to the intervening position of the third on-off valve. Note that when the third on-off valve is opened, the high viscosity coating agent is returned to the pressure tank from the discharge pipe. In this case, the pressure feed line is used as a circulating system.

As described above, when using the constant pressure feeding device of the present invention, it can be used in a circulating manner, so there is no unused high viscosity coating material. In addition, since it can be used as a dead-end system with two systems, in this case the distance for pumping the high viscosity coating agent is approximately 1/2 of the length of the pressure-feeding conduit, reducing pressure loss within the conduit.

[Embodiment] Next, a constant pressure feeding device according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is an explanatory diagram of a constant pressure feeding device according to an embodiment of the present invention, showing a state in which it is used in a dead-end system, and FIG. 2 shows a state in which the constant pressure feeding device shown in FIG. 1 is used in a circuit system. ing.

In Figs. 1 and 2, 1a and 1b are flow guns, 2 is a pressure pipe connected in a loop, 3 is a pressure pump, 4 is a pressure tank, 5 is a supply pipe, 6 is a discharge pipe, and 7 is a pressure pipe connected in a loop. 1 on-off valve, 8 on-off valve, 9 second on-off valve
is the third on-off valve. The supply connection part 5a of the supply pipe line 5 and the pressure-feeding pipe line 2, and the discharge connection part 6a of the discharge pipe line 6 and the pressure-feeding pipe line 2 are provided close to each other,
A first on-off valve 7 is interposed in the pressure feed line 2 between the supply connection part 5a and the discharge connection part 6a. The second on-off valve 8 is interposed in the pressure-feeding conduit 2 at a position farthest from the supply connection portion 5a or near it. The third on-off valve 9 is interposed in the discharge pipe 6. The flow gun 1a is connected to the pressure feed line 2 between the supply connection part 5a and the second on-off valve 8, and the flow gun 1b is connected to the pressure feed line 2 between the discharge connection part 5b and the second on-off valve 8. has been done. Note that 10 is a filter, 11 is a regulator, 12 is an accumulator, and 13 is a coating zone or a sealer zone.

FIG. 1 shows the state of use in a dead-end system. In this case, the first on-off valve 7 is open and the second on-off valve 7 is open.
The on-off valve 8 and the third on-off valve 9 are closed.
Therefore, the high viscosity coating agent discharged from the pressure pump 3 is divided into two parts at the supply connection portion 5a of the pressure feed line 2, one part flowing as shown by arrow A and the other flowing as shown by arrow B. The high-viscosity coating agent thus divided into two parts and pumped through the loop-shaped pressure-feeding pipe 2 flows toward the closed second on-off valve 8 and is stopped there. Thus, in this case, it functions in the same way as if two systems of dead-end pressure feed lines were provided.

When used in the above manner, the supply pressures of the high viscosity coating agent supplied to each flow gun 1a, 1b are approximately equal, and the length of the pipe from the pressure pump 3 is short, so that the finish quality of the coated surface is improved. This avoids problems such as variations in the viscosity of the coating material and poor flow of the viscosity coating agent.

FIG. 2 shows the state of use in the circulating system. In this case, the first on-off valve 7 and the third on-off valve 9 are closed, and the second on-off valve 8 is opened. Therefore, the high viscosity coating agent discharged from the pressure pump 3 flows in one direction from the supply connection portion 5a of the pressure feed pipe 2, and flows through the loop-shaped pressure feed pipe 2 in the direction indicated by the arrow A.
The water flows through one cycle as shown by , and is sent to the intervening position of the third on-off valve 9 . In this way, the high viscosity coating agent in the pressure feed pipe line 2 is pressurized, and each flow gun 1a,
1b.

In addition, when using the constant pressure feeding device of the present invention, after applying the coating using the dead end method as shown in Fig. 1 or the circulating method as shown in Fig. 2, the second opening/closing is used to reduce the pressure inside the piping after the work is completed. By closing the valve 8 and opening the third on-off valve 9, the high-viscosity coating agent that has been pressurized and filled in the pressure-feeding line 2 beyond the second on-off valve 8 is recycled from the discharge line 6 to the pressure-feeding tank 4. Ru.

When used as described above, the high viscosity coating agent that stays in the pressure feed line 2 is always fresh, and it is possible to prevent unused high viscosity coating agent from staying in the force feed line 2 forever.

[Effects of the Invention] The constant pressure feeding device of the present invention can be used in a dead-end method or a circulating method depending on the combination of opening and closing of the on-off valve, and these can be arbitrarily selected.

As described above, the constant pressure pumping device of the present invention has both the dead end type and the circulating type, and can take advantage of the advantages of both types and cover their disadvantages.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of use in a dead-end method in a constant-pressure pumping device for high-viscosity coating agents according to an embodiment of the present invention, and Fig. 2 is an illustration of use in a circulating method in the constant-pressure pumping device shown in Fig. 1. FIG. 3 is an explanatory diagram of a conventional dead-end type constant pressure feeding device, and FIG. 4 is an explanatory diagram of a conventional circulating rate type constant pressure feeding device. Main symbols in the drawings, 1a, 1b: flow gun,
2: Pressure feed pipe line, 3: Pressure feed pump, 5: Supply pipe line,
6: discharge pipe, 7: first on-off valve, 8: second on-off valve, 9: third on-off valve.

Claims (1)

[Scope of utility model registration request] A loop-shaped pressure feed pipe 2, a supply pipe 5 connected between the pressure feed pipe 2 and the pressure pump 3, and a discharge pipe 6 connected between the pressure feed pipe 2 and the pressure tank 4. and a first opening/closing line interposed in one line of the pressure feed pipe line 2 between the supply connection part 5a to which the supply pipe line 5 is connected and the discharge connection part 6a to which the discharge pipe line 6 is connected. between the valve 7, the second on-off valve 8 interposed in the other line, the third on-off valve 9 interposed in the discharge pipe 6, and the supply connection portion 5a and the second on-off valve 8. A constant-pressure pumping device for a high viscosity coating agent, comprising at least one flow gun 1a connected to each other, and at least one flow gun 1b connected between the discharge connection portion 6a and the second on-off valve 8.