JP4816543B2 - 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, a small protrusion is provided on the opening surface side of the tip of the protrusion.
JP-A-6-3083 Japanese Patent Laid-Open No. 2007-3178

  However, in the above conventional configuration, in the leakage inspection process after the heat exchanger assembly, it is necessary to ensure airtightness and high adhesion, so that a jig must be used in the cap removal process. It is difficult to remove the cap, and in the process of removing the cap after painting, it is more difficult to remove the cap due to adhesion and baking of the paint, that is, it is difficult to remove the cap. Had.

  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, Although it is not necessary, the cap can be easily attached and detached, but the small protrusion is provided on the opening surface side of the tip of the protrusion, so the cap is placed against the end plate surface that is a component of the heat exchanger. In the case of a structure inserted into a pipe, the small protrusion is oriented toward the end plate, and there is an end plate when removing the cap. Has the problem of lowering.

  The present invention solves the above-described conventional problems, and facilitates the detaching operation of the cap, and also in the case of a structure in which the cap is inserted into the pipe with respect to the end plate surface which is a component of the heat exchanger. It is an object of the present invention to provide a cap that suppresses a decrease in productivity by making the small protrusion easy to grasp.

  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. A cylindrical projection, a projection protruding outward from the cylindrical portion at the opening end of the cylindrical portion, and a small projection provided at the tip of the projection, and the cylindrical portion From the boundary between the circumference of the opening surface and the projection, toward the sealing end of the cylindrical portion, a groove is provided on the outer periphery of the cylindrical portion, leaving a thin portion, and the small projection is It is provided on the sealing end side of the protrusion.

  Thus, when the cap is detached, the thin portion can be easily torn by pinching the projection with a finger. Further, since the small protrusion is provided on the sealing end side of the protrusion, the small protrusion is small even in the case of a structure in which the cap is inserted into the pipe with respect to the end plate surface which is a component of the heat exchanger. It can be set as the structure which is easy to grasp a projection part.

  The cap of the present invention does not require a removal jig, can facilitate the attaching / detaching operation, and also in the case of a structure in which the cap is inserted into the pipe with respect to the end plate surface which is a component of the heat exchanger. , It is easy to grasp the small protrusion, and the reduction in productivity can be suppressed.

  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 At the opening end of the cylindrical part, it comprises a protruding part protruding outward from the cylindrical part, and a small protruding part provided at the tip of the protruding part, and the circumference of the opening surface of the cylindrical part and the A groove is provided on the outer periphery of the cylindrical portion from the boundary with the protruding portion toward the sealing end of the cylindrical portion, leaving a thin portion on the outer periphery of the cylindrical portion, and the small protruding portion is the sealing end of the protruding portion. Since it is provided on the side, when removing the cap, the thin part can be easily torn by gripping the protruding part from the opening surface with the finger and pulling it toward the sealing end, eliminating the need for a removal jig. Desorption work can be facilitated. Further, by hooking a finger on the small protrusion of the protrusion and pulling it from the opening surface toward the sealing end, the thin portion can be easily torn, and the cap can be removed and attached stably. The workability can be improved. Further, when removing the cap, even when the cap is inserted until the opening surface of the cap contacts the end plate of the component of the heat exchanger, the small projection does not catch (fall) on the end plate. Since a finger can be hooked on the part, it is slippery and is easy to grasp, so that a reduction in productivity can be suppressed.

  According to a second aspect of the present invention, in the first aspect of the invention, the small protrusion is provided with a substantially right angle with respect to the protrusion. The decline in sex can be suppressed.

  According to a third aspect of the present invention, in the first aspect of the present invention, since the sand processing part is provided at the tip of the small protrusion part, the small protrusion part is sealed from the opening surface of the cylindrical part. When pulling in the direction, the sand-processed portion is non-slip due to the surface roughness, so that the cap can be stably attached and detached, and the workability can be improved.

  The invention according to claim 4 is the invention according to claim 1, wherein the thickness of the small protrusion is 3 mm or more and 5 mm or less from the surface on the sealing end side of the protrusion, and the tubular shape from the tip of the protrusion. Since the thickness is set to 3 mm or more and 5 mm or less in the part direction, it is possible to achieve both maintenance of the strength of the small protrusions, reduction in productivity and material cost. That is, if the thickness exceeds 5 mm, the cost increases due to an increase in material costs. If the thickness is less than 3 mm, the small protrusions are difficult to grasp, the productivity is lowered, and the strength cannot be maintained.

  The invention according to claim 5 is the invention according to claim 4, wherein the thickness of the small protrusion is 3.5 mm from the surface of the protrusion on the sealing end side and from the protrusion tip to the cylindrical portion. Since it is set to 4 mm in the direction, the operator can hold the small protrusion more reliably.

  The invention according to claim 6 is a heat exchanger in which the opening of the pipe is sealed with the cap according to any one of claims 1 to 5, so that the cap can be easily attached and produced. It is possible to provide a heat exchanger that improves the performance and does not deteriorate the product quality.

  Since the invention according to claim 7 is a heat exchanger in which the heat exchanger according to claim 6 is coated, since the small protrusion is provided on the sealing end side of the protrusion, Since the protrusions are positioned in the opposite direction to the end plate, the small protrusions are less likely to be attached to the end plate by the paint, and the small protrusions can be easily grasped, further reducing the decrease in productivity. it can.

(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 of the surface on the sealing end 5 side. 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.

  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).

  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 small protrusion 16 is 3.5 mm (Y-X dimension in FIG. 2) from the surface of the protrusion 4 on the sealing end 5 side, and 4 mm (S in FIG. 2) from the tip of the protrusion 4 in the direction of the cylindrical portion 2. Dimension) is desirable.

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

  The length of the groove 6 is preferably shorter than the pipe insertion allowance and up to the center.

  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.

  Since the length of the groove 6 is up to the center of the cylindrical portion 2, it becomes shorter than the insertion allowance of the pipe, and when the thin portion 7 is torn, the powder of the paint accumulated in the groove 6 scatters and enters the pipe from the pipe mouth. Invasion can be avoided and quality can be improved.

  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 Since the small protrusion 16 is at the tip of the surface of the protrusion 4 on the sealing end 5 side, the small protrusion 16 can be easily hooked without being held by the end plate. When the projection 16 is prevented from slipping and pulled from the opening surface 3a in the direction of the sealing end 5, the thin-walled portion 7 can be easily torn without sliding the finger, and no extraction jig is required, and the cap 1 can be removed even in a small space. Desorption work can be facilitated.

  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, it is preferable that the protrusion 4 has a length that can be pinched with a finger.

  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, since the small protrusion part 16 becomes more slip-proof by providing at a substantially right angle with respect to the protrusion part 4, and since it is easy to grasp, the fall of productivity can be suppressed more.

  Since the sand processing portion is provided at the tip of the small protrusion portion 16, when the small protrusion portion 16 is pulled from the opening surface 3a of the cylindrical portion 2 toward the sealing end 5, the sand processing portion has a surface roughness. Since it is non-slip, the cap can be removed and attached stably, and workability can be improved.

  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, the cap 1 is attached to the pipe, and the heat exchanger is painted in the painting process. At this time, the small protrusion 16 is provided on the sealing end 5 side of the tip of the protrusion 4, so the small protrusion 16 Since it is located in the opposite direction to the plate, the small protrusion 16 is less likely to adhere to the end plate with the paint (that is, the end plate and the small protrusion 16 are less likely to be bridged with the paint). It can be grasped, and the decrease in productivity can be further 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 protruding portion protrudes outward from the position located inside from the opening surface, but may be a protruding portion protruding outward along the opening surface.

  As described above, the cap according to the present invention makes it easy to remove and attach the cap, and is also small even in the case of a structure in which the cap is inserted into the pipe with respect to the end plate surface that is a component of the heat exchanger. The structure that makes it easy to grasp the protrusions suppresses the decline in productivity, so heat exchangers for freezing and refrigeration and air conditioning, automobiles, water heaters, and other openings are sealed. It can also be applied to sealing applications for devices and devices that require a large amount of time.

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 16 Small protrusion part

Claims (7)

  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 that protrudes outward from the cylindrical portion, and a small projection provided at a tip of the projection, and the cylinder from the boundary between the circumference of the opening surface of the cylindrical portion and the projection. A cap is provided with a groove on the outer periphery of the cylindrical portion leaving a thin portion toward the sealing end of the cylindrical portion, and the small protruding portion is provided on the sealing end side of the protruding portion.   The cap according to claim 1, wherein the small protrusion is provided at a substantially right angle to the protrusion.   The cap according to claim 1, wherein a sand processing part is provided at a tip of the small protrusion part.   2. The cap according to claim 1, wherein a thickness of the small protrusion portion is 3 mm or more and 5 mm or less from a surface of the protrusion portion on the sealing end side, and 3 mm or more and 5 mm or less from the protrusion tip toward the tubular portion.   5. The cap according to claim 4, wherein the small protrusion has a thickness of 3.5 mm from a surface of the protrusion on the sealing end side and 4 mm from the protrusion tip toward the cylindrical portion.   The heat exchanger which sealed the opening part of the pipe with the cap as described in any one of Claim 1 to 5.   A heat exchanger obtained by coating the heat exchanger according to claim 6.

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