JP3006963U - Coupler for tubular body - Google Patents

Abstract

(57) [Abstract] [Purpose] Extending the life of packing for fluid seal in a coupler for connecting a fluid source to the tubular end of equipment,
Provide a coupler that enhances reliability. A body (1) and an annular body (2) that loosely fits the outer periphery of the body (1) are provided, and a mechanism for sliding the annular body (2) along the outer periphery of the body (1) is provided. Inside the body (1) and the annular body (2), a guide portion (4) whose one end is inserted into the inside of the connecting pipe end portion (6) is provided.
A compression spring (5) is provided in the center of the body (1) and on the back side of the guide (4). A packing (3) is provided between the body (1), the annular body (2) and the guide portion (4).

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is designed to connect a fluid source to the connection pipe end of equipment in the production process and inspection process of refrigeration equipment, air-conditioning equipment, etc., and to perform gas filling, leak test, pressure resistance test, etc. The present invention relates to a tubular body coupler that connects a tube end and a fluid source.

[0002]

[Prior art]

 FIG. 5 is a typical example of use of a conventional coupler, which is an explanatory diagram of a leak test of a container or tubular device. A test body is placed in a vacuum chamber, and helium gas is sealed in the test body through the coupler. If the test body has small holes due to poor welding, etc., the helium gas leaks into the vacuum chamber.By detecting this helium gas with a helium leak tester, it is possible to perform a leak test on the test body. It is like this. A condenser is mentioned as an example of the test body, but in the case of a device such as a condenser that performs heat exchange, a fold is often formed on the inner surface of the pipe for rapid heat exchange. In order to make a coupler connection at the end of such a pipe, the fluid must be sealed at the outer peripheral surface of the pipe end. Also, leaking helium gas from the coupler should not be mistaken as leaking helium gas from the test piece. FIG. 6 shows an example of the structure of a conventional coupler, which is a type in which the outer circumference of a pipe to be connected is sealed, (21) is a body and (22) is a guide pipe. The guide tube (22) is hollow to allow a fluid to flow therethrough, and can be slid in the body (21) in the axial direction by an air cylinder (not shown) or the like. Further, the outer circumference of one end (the left end in the figure) of the guide tube (22) is thickened in a convex shape, and the groove of the O-ring (23) is formed together with one end of the body (21). There is. If the guide tube (22) moves to the right in the figure, the outer diameter of the O-ring (23) becomes thicker, and conversely, if the guide tube (22) returns to the left in the figure, the outside of the O-ring (23). The diameter returns to the original outer diameter. (24) is an annular body, and (25) is an O-ring. The annular body (24) is loosely fitted to the outer periphery of the body (21) and can be slid by an air chilling (not shown) or the like. In addition, an annular convex portion is provided inside one end portion (the left end portion in the drawing) of the annular body (24), and this convex portion is formed together with one end portion of the body (21) of the O-ring (25). Forming a groove. When the annular body (24) is moved to the right in the figure, the inner diameter of the O-ring (25) becomes smaller, and conversely, when the annular body (24) returns to the left in the figure, the inner diameter of the O-ring (25) becomes the same. Return to the inner diameter of. The procedure for attaching the coupler to the end of the pipe of the test piece as shown in FIG. 6 will be described. The entire coupler is moved leftward in the figure toward the end (6) of the pipe of the test piece. Insert the inner pipe (22) into the pipe end (6) and stop the movement of the coupler when the guide pipe (22) enters the inside of the pipe end (6) for a predetermined length. When the guide tube (22) is moved to the right in the figure, the O-ring (23) is pressed against the inner surface of the tube end (6), and the coupler is fixed to the tube end. When the annular body (24) is moved to the right in the figure, the inner diameter of the O-ring (25) becomes smaller and the O-ring (25) is pressed against the outer circumference of the pipe end (6). As a result, the fluid (helium gas in FIG. 5) inside the tube end portion (6) and the guide tube (22) can be prevented from leaking to the outside.

[0003]

[Problems to be solved by the device]

 In the conventional coupler, when the coupler is repeatedly attached to and detached from the end of the pipe to be connected, the O-ring (25) in FIG. 6 is permanently deformed by the compressive force, and the O-ring ( The inner diameter portion of 25) protrudes inward. If the coupler is continued to be attached and removed in this state, the inner diameter of the O-ring (25) will be damaged by the corners of the end face of the pipe end (6), and the rubber on the surface will partly peel off. The fluid seal on the outer circumference of (6) becomes incomplete, and the fluid leaks to the outside, making the coupler unusable. One possible solution to this problem is to use a large packing in place of the O-ring (25) to increase the amount of deformation of the packing. A large gap can be secured between the inner diameter of the packing and the outer circumference of the pipe end in the uncompressed state. However, this method has a drawback in that it is not possible to use it for equipment in which the space around the connecting pipe is small and the packing is expensive because the entire coupler is large.

[0004]

[Means for Solving the Problems]

 A ring-shaped body with an annular packing (3) (for example, an O-ring) interposed on the outer periphery of the guide portion at the front end portion of the body (1) having a guide portion fitted at one end via a compression spring (5). A coupler for tubular body, wherein the coupler is slidably inserted into the body.

[0005]

[Action]

 The coupler of the present invention is used in a place where a fluid source is connected to a connecting pipe end of equipment in the production process and inspection process of refrigeration equipment, air-conditioning equipment and the like. Since the coupler of the present invention is configured as described above, the outer diameter of a part of the guide portion can be made substantially equal to the outer diameter of the tube end portion. By doing so, when the coupler is attached or detached, the inner diameter portion of the annular packing (for example, the O-ring) is a guide having an outer diameter of the pipe end to be connected or an outer diameter substantially equal to the outer diameter of the pipe end. Since the annular packing is always in contact with any one of the outer peripheral surfaces of the pipe, it is possible to prevent the annular packing from being scratched at the corners of the end surface of the pipe end, thus improving the life of the annular packing.

[0006]

【Example】

 First Embodiment FIG. 1 is a sectional view showing a first embodiment. FIG. 2 is a sectional view showing a state in which the coupler shown in the first embodiment is attached to the end portion of the connecting pipe. In FIG. 1, a hose for introducing fluid is connected to the right end of the body (1). The annular body (2) is loosely fitted to the outer peripheral surface of the body (1) and can be slid by an air cylinder (not shown). The hole in the center of the guide (4) is a fluid passage. Looking at the outer circumference of the guide part (4), the conical part at the left end of this figure and the cylindrical part adjacent to it have the role of guiding and fitting the coupler to the connecting pipe end part (6). The cylindrical portion (the portion in contact with the O-ring (3) in FIG. 1) has a diameter equal to the outer diameter of the connecting pipe end portion (6). The cylindrical portion having the largest straight diameter on the outer circumference of the guide portion (4) is a step portion for preventing the guide portion (4) from protruding from the body (1) by the force of the compression spring (5). The compression spring (5) is for constantly pushing the guide portion (4) to the position shown in the figure against the frictional force of the O-ring (3). The procedure for attaching the coupler shown in the first embodiment to the connecting pipe end portion (6) will be described with reference to FIG. When the pipe end (6) is fixed, the entire coupler (part numbers (1) to (5)) is inserted into the pipe end (6) with the guide (4) as a guide. Next, the annular body (2) is pulled to the right with respect to the body (1) by an air cylinder, and the O-ring (3) is compressed, so that the O-ring (3) becomes the outer peripheral surface of the pipe end (6). The coupler can be fixed to the pipe end (6) by closely contacting with, and the fluid flowing inside the coupler can be prevented from flowing out. In the process of attaching / detaching the coupler to / from the pipe end (6), the inner diameter portion of the O-ring (3) has a cylindrical outer peripheral surface having the same diameter as the pipe end (6) of the guide portion (4) and the pipe end ( Since the O-ring (3) is alternately moved to and from the outer circumference of 6), the O-ring (3) is not expanded by the corner portion of the cylindrical shape whose diameter is larger than its inner diameter. Can be prevented from being scratched at the corners of the end face of the pipe end (6). 3 is a cross-sectional view showing the second embodiment, and FIG. 4 is a cross-sectional view for explaining the guide portion (14) and the pipe end portion (6) in the second embodiment in detail. The parts of the second embodiment different from the first embodiment are the guide portion (14) and its related parts, and the coupler as a whole is similar to that of the first embodiment. The guide portion (14) will be described with reference to FIG. In this figure, the conical part (A) (14a) and the cylindrical part (A) (14b) of the guide part (14) are fitted by guiding the guide part (14) to the inner diameter part of the connecting pipe end part (6). This is the part that meets. The diameter of the left end of the cone (B) (14c) is equal to the outer diameter of the tube end (6). The inner diameter of the annular convex portion on the inner side of the left end portion of the annular body (12) is larger than the diameter of the left end portion of the conical portion (B) (14c) of the guide portion (14), and the conical portion (B) ( Since it is smaller than the diameter of the right end portion of 14c) (that is, the outer diameter of the cylindrical portion (B) (14d)), the guide portion (14) does not come out of the annular body (12). Although the taper angle of the conical portion (B) (14c) of the guide portion (14) is large in FIG. 4 for convenience of explanation, it is actually a small taper (for example, taper 0.1). Often there is.

[0007]

[Effect of device]

 According to the present invention, the O-ring can be prevented from being scratched at the corners of the end face of the connecting pipe, so that the life of the O-ring is improved and the reliability of the fluid seal is improved. Further, it is possible to provide a compact and inexpensive coupler having a simple structure.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment.

FIG. 2 is a cross-sectional view showing a state in which the coupler shown in Embodiment 1 is attached to an end portion of a connecting pipe.

FIG. 3 is a sectional view showing a second embodiment.

FIG. 4 is a cross-sectional view for explaining in detail a guide portion (14) and a pipe end portion (6) in the second embodiment.

FIG. 5 is an explanatory view of a typical use example of the coupler according to the present invention.

FIG. 6 is a sectional view of a conventional coupler.

[Explanation of symbols]

 1, 11 body 2, 12 annular body 3, 13 O-ring 4, 14 guide part 5, 15 compression spring 6 connecting pipe end part 14a conical part (A) 14b cylindrical part (A) 14c conical part (B) 14d cylindrical part (B) 21 body 22 guide tube 23 O-ring 24 annular body 25 O-ring 26 helium leak inspection machine 27 vacuum tank 28 test body 29 connecting tube 30 helium gas A coupler

Claims (1)

[Scope of utility model registration request] 1. A ring-shaped body is slidably inserted into the body with a ring-shaped packing interposed on the outer periphery of the guide unit at the front end of the body having a guide unit fitted to one end via a compression spring. A tubular body coupler characterized by the above.