JP4803092B2 - Caps and heat exchangers - Google Patents

Description

  The present invention relates to a cap and a heat exchanger sealed with the cap.

  Generally, caps are used to seal the inlet / outlet pipes of heat exchangers used in refrigeration, refrigeration equipment, air conditioning equipment, etc., for inspection of leaks after assembly of the heat exchanger, and for masking during painting. It is used in various ways to prevent the inflow of foreign substances such as moisture.

  In order to use a single cap for leak inspection, for masking during painting, and for preventing inflow of foreign matter, a cap that maintains airtightness and is easy to remove and attach is desired.

  FIG. 6 is a cross-sectional view of a conventional cap described in Patent Document 1.

  As shown in FIG. 6, the cap 11 includes an opening end 12, a sealing end 13, cylindrical part inner surfaces 14, 14 a and 14 b, and cylindrical parts 15 and 15 a.

  Note that the material of the cap 11 is elastic nitrile butadiene rubber.

  The operation of the cap configured as described above will be described below.

  First, in order to maintain airtightness, the cylindrical part inner surfaces 14 and 14b of the cap 11 have a smaller diameter than the outer diameter of the inlet / outlet pipe (not shown) to be inserted and are closely bonded, while the cap mounting process and the desorption process. In order to reduce the work load, the inner surface 14a of the cylindrical portion is larger than the outer diameter of the inlet / outlet pipe, and is not in close contact with the inlet / outlet pipe.

  Further, as a means for preventing hip breakage at the time of wearing, the diameter difference between the cylindrical portion inner surfaces 14, 14a, 14b constituted by the opening end 12 and the cylindrical portions 15, 15a is increased, and the thickness is increased. .

  Lubricating oil is applied to the open end 12 of the cap 11, the cap 11 is attached to the inlet / outlet pipe, and leakage inspection of the heat exchanger is performed. Thereafter, the surface treatment of the coating is performed depending on the application. The cap 11 is removed from the opening end 12 in the direction of the sealing end 13 with a cutter or the like, a punching jig is sandwiched between the outer diameter difference portions of the cylindrical portion 15 and the cylindrical portion 15a, and the cap 11 is extracted. That is the main thing.

Moreover, the cap described in Patent Document 2 is a cap made of an elastic material that seals the end portion of a pipe, and has a cylindrical portion whose one end surface is sealed and the other end surface is opened, and a cylindrical shape. At the opening end of the cylindrical portion, and a protruding portion protruding outward along the opening surface of the cylindrical portion, and from the boundary between the circumference of the opening surface of the cylindrical portion and the protruding portion, the sealing end of the cylindrical portion Toward the outer periphery of the cylindrical part, leaving a thin part and having a groove. Furthermore, the length of the groove is longer than the insertion allowance of the pipe.
JP-A-6-3083 Japanese Patent Laid-Open No. 2007-3178

  However, in the configuration of the above-mentioned conventional Patent Document 1, since it is necessary to ensure airtightness in the leak inspection process after assembling the heat exchanger and the adhesion is high, a jig is used in the cap removal process. It is difficult to remove the cap as much as necessary. Furthermore, in the process of removing the cap after painting, it is more difficult to remove the cap due to the adhesion and baking of the paint, that is, it is difficult to remove the cap. , Had a problem of.

  Moreover, in the structure of the above-mentioned conventional patent document 2, in the detaching operation of the cap, the thin portion can be easily torn by gripping the protruding portion with the finger from the opening surface toward the sealing end, The cap can be easily removed and attached, and the length of the groove is longer than the insertion allowance of the pipe, so that it is easier to remove the cap from the pipe after tearing the thin part. However, since the groove length is longer than the insertion allowance of the pipe, the foreign matter generated when tearing the thin part scatters and easily enters the pipe from the tip of the pipe. In this configuration, the cap removal / removal operation has to be performed with more care, and the removal / removal operation requires more time, which has the problem that productivity is reduced.

  The present invention solves the above-described conventional problems, and makes it easy to remove and attach the cap, and prevents the foreign matter generated during removal from entering the pipe. An object of the present invention is to provide a cap that provides both of the cap removal / attachment operation and the reduction in productivity.

  In order to solve the above-described conventional problems, the cap of the present invention is a cap made of an elastic material for sealing an end of a pipe, and the cap has one end sealed and the other end opened. And at the opening end of the cylindrical portion, a protruding portion protruding outward from the cylindrical portion, and from the boundary between the circumference of the opening surface of the cylindrical portion and the protruding portion The groove is provided on the outer periphery of the tubular portion with a thin wall portion toward the sealing end of the tubular portion, and the length of the groove is equal to or less than the insertion allowance of the pipe.

  Thus, when the cap is detached, the thin portion can be easily torn by pinching the projection with a finger. In addition, since the length of the groove is set to be equal to or less than the insertion allowance of the pipe, it is possible to reduce foreign matter generated when the thin portion is torn off and entering the pipe from the tip of the pipe.

  The cap of the present invention does not require a removal jig, can facilitate the detaching operation, and can reduce the intrusion of foreign matter into the pipe when the cap is detached, thereby suppressing a decrease in productivity.

  The invention according to claim 1 is a cap made of an elastic material for sealing an end portion of a pipe, wherein the cap has a cylindrical portion whose one end surface is sealed and the other end surface is opened, and The opening of the cylindrical portion is formed with a protruding portion protruding outward from the cylindrical portion, and the cylindrical portion is sealed from the boundary between the circumference of the opening surface of the cylindrical portion and the protruding portion. Toward the toe, a groove is provided leaving a thin portion on the outer periphery of the cylindrical portion, and the length of the groove is set to be equal to or less than the insertion allowance of the pipe. By pulling with a finger from the opening surface of the pin toward the sealing end, the thin-walled portion can be easily torn, no removal jig is required, and the cap can be easily attached and detached. In addition, since the length of the groove is less than the insertion allowance of the pipe, it is possible to reduce foreign matter generated when tearing the thin-walled portion, and to enter the pipe from the tip of the pipe. Therefore, a decrease in productivity can be suppressed.

  According to a second aspect of the present invention, in the first aspect of the invention, the groove is formed up to a substantially central portion of the cylindrical portion, so that the cap can be easily attached and detached, and the thin portion It is possible to reduce the amount of foreign matter that is generated when tearing the material from being scattered and enter the pipe from the end of the pipe, and it is possible to suppress a decrease in productivity because it does not require much time for the detachment work.

  According to a third aspect of the present invention, in the invention according to the first or second aspect, the cap is easily installed and the productivity is improved by adopting a heat exchanger in which the opening of the pipe is sealed with the cap. It is possible to provide a heat exchanger that does not deteriorate product quality.

  According to a fourth aspect of the present invention, since the heat exchanger according to the third aspect is a heat exchanger in which the heat exchanger is coated, the length of the groove is equal to or less than an insertion allowance of the pipe. Thus, it is possible to reduce the coating powder accumulated in the groove when the material is torn and to enter the pipe from the end of the pipe, and it is possible to provide a heat exchanger that does not deteriorate the product quality.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. About the same structure as the past, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted. The present invention is not limited to the embodiments.

(Embodiment 1)
1 is a side view of a cap according to the first embodiment of the present invention, FIG. 2 is a sectional view of the cap according to the first embodiment, FIG. 3 is a view taken along the line AA in FIG. 1, and FIG. FIG. 5 is an enlarged view of a portion C in FIG. 4.

  1 to 5, a cap 1 is a cap made of an elastic material that seals an end of a pipe (not shown), and has a cylindrical portion with one end sealed and the other end open. 2 and a projecting portion 4 projecting outward from a position located inside from the opening surface 3a of the tubular portion 2 toward the sealing end 5 at the opening end 3 of the tubular portion 2, A small protrusion 16 is provided at the tip. Further, from the boundary between the circumference of the opening surface 3a of the cylindrical portion 2 and the protrusion 4, toward the sealing end 5 of the cylindrical portion 2, the thin portion 7 is left on the outer periphery of the cylindrical portion 2, and the groove is left. 6.

  The small protrusions 16 are preferably on the surface of the protrusion 4 on the sealing end 5 side.

  A notch 8 is provided in the vicinity of the opening end 3 of the thin portion 7.

  The material of the cap 1 is elastic nitrile butadiene rubber.

  The outer diameter of the cylindrical portion 2 of the cap 1 is 12 mm, the length of the pipe insertion direction axis of the cylindrical portion 2 is 15 mm, and the thickness of the pipe insertion direction axis near the tip of the protrusion 4 is 3 mm.

  The thickness of the pipe insertion direction axis at the base of the protrusion 4 (Y dimension in FIG. 2) is thicker than the thickness of the pipe insertion direction axis near the tip of the protrusion 4 (X dimension in FIG. 2).

  The protrusion 4 is located at a position of 2 mm inward from the opening surface 3a toward the sealing end 5 (Z dimension in FIG. 2).

  The pipe is inserted up to the sealing end 5.

  In addition, the thickness (P dimension in FIG. 3) of the thin part 7 provided in the cap 1 is made constant along the pipe insertion direction axis. Specifically, it is constant according to the shape of the cylindrical part inner surfaces 9, 9a. The thickness is preferably selected depending on the material, but is preferably about 1 mm when the material is nitrile butadiene rubber.

  The length of the notch 8 is desirably about 1 mm.

  The length of the groove 6 is preferably equal to or less than the insertion allowance of the pipe and up to the substantially central portion of the cylindrical portion 2. Here, the length of the groove 6 is 10 mm.

  One projection 4 is provided.

  About the cap 1 comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, in the mounting operation of mounting the cap 1 on the pipe, the resistance between the pipe and the cap 1 at the time of mounting can be reduced by the elastic action of the thin portion 7 provided on the cap 1, and the mounting operation of the cap 1 is performed. Can be done smoothly.

  In addition, since the thickness of the thin part 7 provided in the cap 1 was made constant according to the shape of the cylindrical part inner surface 9, 9a, the resistance at the time of mounting can be further reduced, and the mounting work of the cap 1 is smoother. Can be done.

  In addition, in the leak inspection of the heat exchanger using the cap 1, the tightness of the rubber of the thin portion 7 can ensure airtightness as before, and the leak inspection can be performed.

  In addition, by providing the groove 6, when the pipe is deformed, the groove 6 absorbs and airtightness is ensured.

  Moreover, in the removal | desorption operation | work of the cap 1, the thin part 7 can be easily torn by pinching the protrusion part 4 with the finger | toe and pulling it from the opening surface 3a to the sealing end 5 direction. It is possible to facilitate the desorption work.

  Therefore, in the detaching operation of the cap 1, a cutter and a punching jig are not required, and man-hours for preparing a cutter and a jig and handling man-hours are unnecessary, so that workability can be improved.

  Furthermore, since a cutter or the like is not used, safety can be improved.

  By providing the notch 8 in the vicinity of the opening end 3 of the thin-walled portion 7, the thin-walled portion 7 can be torn with the notch 8 as a starting point, and the work of removing the cap 1 can be further facilitated.

  Since the thickness of the thin portion 7 is constant along the axis of the pipe insertion direction, the protrusion 4 can be pinched and pulled with a uniform force, so that the cap 1 can be stably attached and detached.

  The thickness of the shaft in the insertion direction of the pipe at the base of the projection 4 is larger than the thickness of the shaft in the insertion direction of the pipe near the tip of the projection 4, so that the projection is stressed when the projection 4 is pinched and pulled. The strength of the base of the portion 4 is improved, the protruding portion 4 is not broken, and the cap 1 can be attached and detached stably.

  If the length of the groove 6 is equal to or longer than the insertion allowance of the pipe, there is a possibility that foreign matter generated when tearing the thin wall portion will scatter and enter the pipe from the tip of the pipe. Since it takes a lot of time for the desorption work, the productivity is reduced. However, the length of the groove 6 is set to be less than the insertion allowance of the pipe. It is possible to reduce the occurrence of foreign matter scattered and entering the pipe from the end of the pipe, and since it does not take much time for the detaching operation, it is possible to suppress a decrease in productivity.

  Since the protrusion 4 is positioned inward from the opening surface 3a toward the sealing end 5, when the cap 1 is detached, the cap is an end plate (not shown) which is a component of the opening surface 3a and the heat exchanger. Even in the case of the structure inserted into the pipe up to the surface, the protrusion 4 protrudes outward from the position positioned inward from the opening surface 3 a toward the sealing end 5, so that the gap between the end plate and the protrusion 4 As a result, it is easy for an operator to put a finger between the end plate and the protrusion 4, and productivity (workability) is improved.

  Further, when pulling from the opening surface 3a toward the sealing end 5 direction, the thin-walled portion 7 can be easily torn without sliding the finger by hooking the finger on the small protrusion 16 provided at the tip of the protruding portion 4. A removal jig is not required, and the cap 1 can be easily attached and detached even in a small work space.

  In the present embodiment, the number of the protrusions 4 is one. However, since two or more protrusions 4 are provided, it is not necessary to regulate the direction of the protrusions 4 for ensuring the workability of the detaching operation. It is possible to improve the mounting work.

  Furthermore, the protrusion 4 can easily tear the thin portion 7 by gripping the protrusion 4 with the finger from the opening surface 3a toward the sealing end 5 in the work of detaching the cap 1. The cap 1 can be easily attached and detached without being necessary. However, in the mounting operation of attaching the cap 1 to the pipe, the protrusion 4 is pressed from the opening surface 3a of the cylindrical portion 2 toward the sealing end 5 with a finger. By expanding the diameter of the open end 3 of the cylindrical portion 2 from the original diameter, the cap 1 can be easily attached to the pipe. After the cap 1 is attached, the finger holding the projection 4 is released. Thus, the pipe and the cap 1 are in close contact, that is, the airtightness of the pipe and the cap 1 is maintained.

  In addition, although it is desirable for the projection part 4 to be the length which can be pinched with a finger, it is good also as the projection part 4 of the length which can be grasped with a jig | tool.

  Moreover, the thickness of the protrusion part 4 needs to be thick enough to withstand pulling.

  In addition, since the removal tool does not require the removal tool, the outer diameter difference of the cylindrical portion 2 required when the cap 1 is sandwiched by the removal tool is eliminated, the outer diameter is the same, and the material cost is reduced. Therefore, it becomes a low-cost cap.

  Note that when the cap 1 is used as a member for sealing an opening of a pipe through which a medium such as a refrigerant of a heat exchanger flows, the work of the cap 1 and attachment / detachment of the cap 1 are easy, so that productivity can be improved. In addition, since it is not necessary to use a cutter or a jig, the pipe is not damaged, so that a heat exchanger that does not deteriorate the product quality can be provided.

  In addition, the cap 1 is attached to the pipe, and the heat exchanger is painted in the painting process, but the pipe 1 is positioned so that the opening end 3 of the cap 1 is located on the upper side in the vertical direction and the sealing end 5 is located on the lower side in the vertical direction. Since the paint flows along the groove 6 at that time, the paint reservoir near the open end 3 can be reduced, and the adhesion between the paint reservoir and the cap can be reduced, so that the cap 1 can be easily attached and detached. Yes.

  In addition, when the cap 1 is attached to the pipe and the heat exchanger is painted in the painting process, if the length of the groove 6 is longer than the pipe insertion allowance, the paint accumulated in the groove 6 when the thin portion 7 is torn. Powder may scatter and enter the pipe from the tip of the pipe, but because the length of the groove 6 is less than the pipe insertion allowance, the torn tip of the groove 6 does not reach the tip of the pipe. When the thin portion 7 is torn, it can be reduced that the powder of the paint accumulated in the groove 6 scatters and enters the pipe from the tip of the pipe, and it does not take much time for desorption work. Can be suppressed.

  In addition, as an application example of the cap 1 of the present embodiment, the heat exchanger has been specifically mentioned. However, the present invention is not limited to this. Applications for equipped equipment and devices are also possible.

  That is, the internal and external ventilation through the opening is temporarily sealed during standby or storage until the normal connection state at the opening is completed, and then the sealing is released to perform the normal connection. It becomes effective for various requested objects.

  In the present embodiment, the protrusion protrudes outward from the position located inside from the opening surface, but may protrude outward along the opening surface.

  As described above, the cap according to the present invention facilitates detachment of the cap and suppresses a decrease in productivity, so that the heat exchanger for refrigeration and air conditioning, for automobiles, for water heaters, etc. In addition, the present invention can be applied to other devices and devices that require sealing of openings.

The side view of the cap in Embodiment 1 of this invention Sectional view of the cap in the same embodiment AA arrow view of FIG. B arrow view of FIG. The C section enlarged view of FIG. 4 of the cap in the same embodiment Cross section of a conventional cap

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cap 2 Cylindrical part 3 Open end 3a Open surface 4 Protrusion part 5 Sealing end 6 Groove 7 Thin part

Claims (4)

  A cap made of an elastic material for sealing an end of a pipe, wherein the cap has a cylindrical portion whose one end surface is sealed and the other end surface is opened, and an opening end of the cylindrical portion, A projection part protruding outward from the tubular part, and from the boundary between the circumference of the opening surface of the tubular part and the projection part toward the sealing end of the tubular part, the tubular part The groove is provided with a groove leaving the thin part on the outer periphery of the part, and the length of the groove is equal to or less than the insertion allowance of the pipe.   The cap according to claim 1, wherein the groove is formed up to a substantially central portion of the cylindrical portion.   The heat exchanger which sealed the opening part of the pipe with the cap of Claim 1 or 2.   A heat exchanger obtained by coating the heat exchanger according to claim 3.

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