JPH0222645Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Related Industrial Field) The present invention relates to the improvement of a pipe joint that is attached to a water supply port for mold cooling water, for example, and that allows the flow rate to be checked.

(Prior art) For example, for items such as molds that are cooled by supplying cooling water, the cooling water that is supplied through one main supply pipe is distributed and supplied to multiple locations through branch pipes. However, the flow rate of cooling water must always be detectable.

In response to such demands, the present applicant filed a utility model registration application for the invention titled "Pipe fitting that can confirm flow rate" dated November 27, 1989 (Utility model registration
-93690) (hereinafter referred to as the first invention).

Recent inventions have made it easier to detect the flow rate, but if limescale adheres to the inner surface of the transparent outer tube, it becomes difficult to see through the indicator that detects the flow rate. Therefore, removing the limescale remained an unsolved problem.

(Problem to be solved by the invention) By improving the above previous invention, it is possible to remove limescale adhering to the inner surface of the transparent outer tube with a simple device, and whenever it becomes dirty with limescale, it can be wiped to maintain the transparency of the transparent outer tube from beginning to end. The aim is to make it possible to maintain the

(Solution of invention) It is a pipe joint that has appropriate connection parts such as female and male threads, plugs, etc. at both ends, and the main body formed integrally on one connection part side has a concentric connection part toward the other connection part. an extension section consisting of a connected large-diameter cylindrical section and a small-diameter cylindrical section at the tip thereof; the other connection section is removably fixed to the distal end of the extension section; A transparent outer tube is rotatably held between the extension part and the extension part so that the extension part can be seen through, and a ring-shaped indicator biased toward the large diameter cylindrical part by a compression spring is fitted onto the small diameter cylindrical part of the extension part. Then, between the main body and the other connecting part, a coil spring whose outer diameter is slightly larger than the inner diameter of the transparent outer tube is installed between the indicator and the transparent outer tube in a free state, and the transparent outer tube is rotated. The feature is that the water scale attached to the inner surface is removed by doing so.

(Embodiment of the invention) The figure shows an embodiment of the invention, in which a pipe joint is constructed of a main body 1, an adapter 2 provided at one end of the main body 1, and a transparent outer tube 3 sandwiched between both 1 and 2. A main cylindrical body is constructed.

The main body 1 has a connecting part 1a (female threaded part in the figure) at the outer end.
An extension portion 1b protruding toward the adapter 2 is screwed to the other end.

A valve 4 for flow rate adjustment is provided next to the connection portion 1a of the main body 1. The valve 4 has a valve handle 5 attached to a hole provided toward the center of the main body 1.
It is now done by turning the . 6 is the valve shaft, 7 is the shaft stopper, 8 is the set screw,
9 is a ball valve. 10 is an O-ring, 11
is a gasket in contact with the ball valve 9. 12
is a scale indicating the rotation angle of the valve handle provided on the outer surface of the main body, that is, the amount of flow rate adjustment.

The extension part 1b is screwed 13 to the main body 1, and a gasket 15 pressed by a spring 14 is provided to seal the joint.

The adapter 2 is fixed to the tip of the extension part 1b with a screw 16. By tightening the screw 16,
The transparent outer tube 3 is rotatably held between the main body 1 and the transparent outer tube 3. 17 is a sealing O-ring inserted between the transparent outer tube 3 and the adapter 2, and 18 is the transparent outer tube 3.
This is a sealing O-ring inserted between the main body 1 and the main body 1.

A circumferential scale 19 is provided on the outer peripheral surface of the transparent outer tube 3, and the amount of movement of an indicator 20, which will be described later, can be read using this scale.

The extension part 1b of the main body 1 consists of a large diameter cylindrical part 1d and a small diameter cylindrical part 1c, and the adapter 2 is fixed by screwing the screw 16 into a female thread formed at the tip of the small diameter cylindrical part 1c. Further, the inner diameter of the indicator 20 loosely fitted into the extension part 1b is set so that it can slide on the small diameter cylindrical part 1c of the extension part 1b. 21 is provided in the large-diameter cylindrical portion 1d, and connects the center liquid passage hole 22 of the main body 1, the transparent outer tube 3, and the small-diameter cylindrical portion 1.
The valve 4 is located in the middle of the liquid passage hole 22, and by narrowing the valve 4, the amount of fluid flowing toward the liquid passage space 23 can be reduced. It is starting to decrease.

24 is the indicator 20 in the liquid passage space 23
The small diameter cylindrical part 1c and the large diameter cylindrical part 1d of the extension part 1b
The other end of the compression spring 24 is held at the central boss portion of the adapter 2.

The adapter 2 is fixed to the extension part 1b by a boss 25 formed at its center, and several liquid passage holes 26 are provided around this boss. 27 is a female thread for connection that the adapter 2 has.

Reference numeral 29 denotes a one-turn coil spring, the outer diameter of which is slightly larger than the inner diameter of the transparent outer tube 3 in a free state. 30, 30' are the coil springs 29 mentioned above.
A mounting piece is formed by bending both ends of the spring in the axial direction of the spring, and the mounting piece 30 is inserted non-rotationally into the mounting part provided on the main body 1 side, and the mounting piece 30' is inserted on the adapter 2 side. .

(Operation of the device) When fluid is supplied from the direction of arrow X in FIG.
The fluid flows through 1→liquid passage space 23→liquid passage hole 26. At this time, the indicator 20 is pushed to the right in the figure against the elastic force of the compression spring 24, but the movement of the indicator 20 allows the flow rate to be confirmed by the scale 19 provided on the transparent outer tube 3.

When the fluid flows in the axial direction within the liquid passage space 23, limescale accumulates on the inner surface of the transparent outer tube 3 over a long period of time, making it difficult to see through the indicator 20 inside. When this condition occurs, the transparent outer tube 3
rotates against the frictional resistance at the O-rings 17, 18 at both ends and the contact surface between the main body 1 and the adapter 2. Then, the one-turn coil spring 29 rubs the inner circumferential surface of the transparent outer tube 3 to remove scales attached to the inner circumferential surface. In this case, if the transparent outer tube 3 is rotated at least once, the entire surface will be in uniform contact with the one-turn coil spring 29, so that limescale can be sufficiently removed, but it may be rotated twice or three times.

The reason why a one-turn coil spring 29 is used is that as the number of turns increases, the angle θ in FIG. 3 becomes smaller with respect to the axial direction of the transparent outer tube 3. Although it depends on the length of the transparent outer tube, the angle θ is preferably around 45°.

(Effects of the invention) According to the invention, the flow rate can be confirmed by the combination of the transparent outer tube provided on the pipe joint and the indicator, and a coil spring is installed inside the rotatable transparent outer tube. Since it is attached to rotate together with the outer tube, limescale on the inner surface can be completely removed by turning the transparent outer tube at least once. Therefore, the operator only needs to turn the transparent outer tube for a predetermined period of time, and the inner surface of the transparent outer tube will be clean and the flow rate can be correctly checked through the tube.

[Brief explanation of drawings]

Fig. 1 is a side view cut in four halves of the pipe joint, Fig. 2 is a sectional view taken along the - arrow in Fig. 1, Fig. 3 is a front view of a one-turn coil spring, and Fig. 4 is a side view of a one-turn coil spring. figure. In the figure, 1...main body, 1a...(main body)
Connection part, 1b...extension part, 1c...small diameter cylindrical part,
1d...Large diameter cylindrical portion, 2...Adapter, 3...
Transparent outer tube, 4... Valve, 5... Valve handle, 6... Valve shaft, 7... Valve stopper, 8... Set screw, 9... Ball valve, 1
0... O ring, 11... Packing, 12... Scale, 13... Screw joint, 14... Spring, 15... Packing, 16... Screw, 17...
O-ring, 18...O-ring, 19...scale,
20... Indicator, 21... Liquid passage hole, 22...
...Liquid passage hole, 23...Liquid passage space, 24...Compression spring, 25...Boss, 26...Liquid passage hole, 27...
... Female thread, 28 ... Contact surface, 29 ... 1 turn coil spring, 30, 30' ... Mounting piece.

Claims (1)

[Scope of utility model registration request] A pipe joint that has appropriate connections such as female and male threads or plugs on both ends, and a large diameter cylinder that is integrally formed on one side of the connection and connected concentrically to the other side. and a small-diameter cylindrical portion at the tip thereof, the other connecting portion is removably fixed to the distal end of the extending portion, and a transparent The outer tube is rotatably held so that the extension part can be seen through, a ring-shaped indicator biased toward the large diameter part by a compression spring is fitted onto the small diameter part of the extension part, and the main body and the other A flow rate unit with a scale removing device, characterized in that a coil spring whose outer diameter is slightly larger than the inner diameter of the transparent outer tube in a free state is installed non-rotationally between the indicator and the transparent outer tube. Verifiable pipe fittings.