JPS5926690A - Strainer valve - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fluid strainer valve, and the present invention relates to a small and filter strainer valve that is useful when installed at each spray gun outlet of a pressure paint circulation system in a painting apparatus equipped with a plurality of spray guns, for example. The purpose is to provide a strainer valve whose elements can be easily replaced.

Conventionally, this type of strainer is shown in Figure 1 and = 1.
= and those shown in Figure 2.

FIG. 1 is a schematic view of the main parts of a pressure paint circulation device in an automobile top coating apparatus, and FIG. 2 is an enlarged longitudinal cross-sectional view of a strainer. 1 is the supply piping from the paint pressure supply source device;
2II'i, a pressure regulator attached to each spray gun 3; 4, a paint return pipe; Also, 5 is pneumatic piping,
6 is a pneumatic tractor/shomer, 7 is an air valve, 8 is a strainer, 9 is a paint shutoff valve, and 10 is a discharge plug I for removing residual pressure.
The T-joint 12 provided with I is a male-male joint (male thread-male thread) that interconnects the pressure regulator 2, the shutoff valve 9, the strainer 8, and the T-joint 10, respectively. 1
3.14 are flexible paint and air pipes connected to the spray gun 3, respectively.

One of the causes of paint failures on automobiles is foreign matter getting into the paint, or the paint itself clumping together to form lumps.To prevent this, common paint circulation paths should be installed. A filter is provided (not shown), but this alone is not enough and if a malfunction occurs in one of the spray guns, it is necessary to prevent the problem from interfering with other circulating systems. In addition, the aforementioned strainer 8 is provided in the system of each spray gun and is closed off by a shutoff valve 9 to prevent the circulating paint from escaping when the filter element 19 of this strainer 8 is cleaned or replaced. In addition, the T-joint lO is equipped with a shutoff valve 9 to prevent paint from spewing out when removing the
This is a joint fitting for installing a discharge plug 11 for releasing the residual pressure existing in the strainer chamber after it is closed.

In Fig. 2, 15 is the main body of the strainer, 16 is the paint inlet, 17 is the outlet, 18 is the strainer part, 19 filter elements, and 20 and 21 are conical bearing surfaces for sealing and holding the filter element 19. , 20 are provided on the main body 15 side, and 21 is provided on the inner surface of the closing plug 22.

23 is Patsukin.

However, in such a conventional strainer, since the filter element 19 is held in direct contact with the metal conical bearing surfaces at both ends of the main body 151111j and the plug 22 side, the tightening is maintained. Not only is there a strict requirement for dimensional accuracy of the parts, but there is also severe damage to the pressure contact surfaces, which causes some paint to bypass the damaged area without passing through the filter and to be sent directly to the spray gun, causing problems. However, there was a problem in that they had to be inspected and replaced frequently. In order to alleviate the damage to the above-mentioned parts, it has been considered to insert gaskets into the seat surface, but this is impractical as it causes wear and corrosion. Also, when this element 19 is removed, the shutoff valve 9 that prevents the paint from flowing out, the discharge plug It that releases the residual pressure, etc. are independent and separate items, so it is difficult to install them in the device. It was time consuming and the procedure for releasing the residual pressure was also complicated. Furthermore, in many cases, each of the above components has a female thread structure at both ends for connection, so in order to connect them to each other, it is necessary to use a separate male-male joint in the middle. However, it not only takes time and effort to install, but also has the disadvantage that its overall length is extremely large.

This invention was made by focusing on such conventional problems, and includes a fluid inlet, a cutoff valve, a strainer, a discharge valve,
The above problems can be solved by integrally configuring each component such as the outlet in the above order, and by screwing the filter element of the strainer to the main body bulkhead provided between the shutoff valve and the strainer. This is what we are trying to solve.

Hereinafter, this invention will be explained based on the drawings.

FIGS. 3 and 4 are diagrams showing an embodiment of the present invention. Figure 3 shows the first conventional example using this strainer valve.
FIG. 4 is an enlarged longitudinal cross-sectional view of the strainer valve, which is a schematic view comparing the main parts of the figure. Note that the same configurations as those of the conventional example are indicated by the same reference numerals, and redundant explanation will be omitted.

First, to explain the structure, A indicates the entire strainer valve of the present invention, and B indicates the main body of the strainer valve.

E is a paint inlet, ■ is a shutoff valve, S is a strainer, ■2 is a discharge valve, O is a paint outlet, and F is a filter element. This strainer valve A has the above-mentioned inlet EX cutoff valve V], strainer S1 discharge valve V2, and outlet O.
They are arranged in the above order and are integrally formed by a common body B. The main body B is made of brass casting or the like, and is provided with female threads 24 at each tip of the inlet E and the outlet 0, and a male-male joint 25 is screwed thereto. Shutoff valve ■1
2 is a ball-shaped valve, 26 is a ball of the valve member, 27 is a valve hole bored in this ball 26, and FIG. 4 shows the normally open position of the valve. 2B is each valve seat. This Vl can be adjusted by adjusting the direction of the valve hole 27 of the ball 26 by 90 degrees using the handle 29.
They can be opened and closed by rotating them. Next, the strainer S is provided obliquely to the longitudinal axis of the main body B, 30 is a strainer member forming a part of the main body B, and W is a shutoff valve v1 inside the main body B.
and a partition wall provided between the strainers S. As shown separately in FIG. 4, the filter element F includes a hollow cylindrical element body 31, a head 32, and a threaded end portion 33.
and a screen 34.

The element main body 31 has a plurality of arcuate notches 35 arranged in two opposing rows in its hollow cylindrical portion so as to flow through the inner and outer surfaces of the cylindrical portion. The screen 34 is soldered. This filter element pH1 tip threaded portion 33 connects the partition wall 3
It is removably screwed onto a female screw 36 provided in 1. In order to rotate the tip threaded portion 33, the head 32
A driver groove 37 is provided on the top surface. Further, 38 is a closing plug for sealing the external opening of the strainer member 30, and 39 is a gasket. The discharge valve ■2 is the main body B
40 is a ball of the valve member;
1 is a valve hole bored in this ball 40, and FIG. 4 shows the normally closed position.

42 is each valve seat. This valve ■2 is the handle 43
Therefore, by rotating the direction of the valve hole 41 of the ball 40 by 90 degrees, the valve hole 41 can be opened and closed, respectively. A male-male joint 44 is screwed onto the tip of this valve V2.

Next, the effect will be explained.

The paint circulating from the supply pipe 1 to the return pipe 2 is branched and supplied to the spray gun 3 via the pressure regulator 2 between the two and the strainer valve A according to the present invention in series. The paint introduced from the inlet E passes through the shutoff valve ■1 which is normally in the open position, enters the inside of the element body 31 from the inside of the tip threaded part 33 of the filter element F screwed onto the body bulkhead W, and then enters the cylindrical part. It passes through the screen 34 with a shaped surface and reaches exit 0. The discharge valve ■2 is normally closed. If there are foreign substances or coagulated lumps in the introduced paint, they are filtered out by the screen 34 and accumulate inside the filter element F. To remove large foreign objects, remove the closing plug 38 each time a failure occurs or periodically, and then turn the groove 37 of the head 32 with a screwdriver to remove the filter element F to the outside for cleaning or replacement. At this time, prior to removing the plug 38, the shutoff valve Vl is closed to isolate it from the circulation flow, and the discharge valve 2 is opened to release the existing residual pressure and prevent the paint from spewing out from the strainer.

Although the embodiment of the pressure paint circulation device shown in FIGS. 3 and 4 has been described above, the present invention is not limited to the above-mentioned paint device, and the present invention is not limited to the above-mentioned paint device, and the present invention is not limited to the above-mentioned paint device. The present invention can also be applied to a pressure fluid circulation device having one or more branching units for other fluids that do not want to coagulate or the like due to temporary stoppage of circulation, with exactly the same structure and operation.

As described above, according to the present invention, the strainer valve is formed of the fluid inlet, cutoff valve, strainer, discharge valve, and outlet, and these components are arranged in the above order. The main body is constructed in one piece, and the filter element with the strain force is screwed onto the bulkhead of the main body provided between the shutoff valve and the strainer, so the structure of the filter element is simple and fixed. Since the special attachment does not require precision and there is no risk of damage, the attachment can reliably prevent fluid bypass due to leakage. The provision of a manually operated discharge valve simplifies the procedure for releasing and re-closing residual pressure. Furthermore, since each of the above-mentioned constituent members is integrally constructed, the overall size is significantly reduced, and installation in the apparatus is extremely simple.

In addition, if the inlet and outlet sides of this strainer valve are configured with male fittings, it is possible to connect directly to the other device without the need for a separate male-male fitting in the middle. , can contribute to further shortening the total length required for installation.

[Brief explanation of drawings]

1 and 2 are diagrams showing an example of a conventional strainer, FIG. 1 is a schematic diagram of a main part of a booth part of a pressure paint circulation system in an automobile body top coating system, and FIG. 2 is a diagram showing an example of a conventional strainer.
The enlarged vertical cross-sectional views of the strain force, FIGS. 3 and 4 are views showing one embodiment of the strainer valve according to the present invention, and
The figure is an enlarged schematic view of the main parts in comparison with FIG. 1, and FIG. 4 is an enlarged longitudinal cross-sectional view of the strainer valve. A: Strainer valve B: Main body E: Inlet F: Filter element 0・・・・・・
・Dose port S...Strainer Vl...Shutoff valve V2...Discharge valve W...Bulkhead 33...・Tip thread part 36...Female thread 11-

Claims (1)

[Claims] In a strainer valve used in a pressure fluid circulation device, which is equipped with a fluid inlet, a shutoff valve, a strainer, a discharge valve, and an outlet, the main body is integrally constructed by arranging the above components in the above order. A strainer valve characterized in that the filter element of the strainer is screwed to a partition wall of the main body provided between the shutoff valve and the strainer.