JP2013185772A - Sealing structure of heat exchanger, and heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealing structure capable of preventing caps from coming off by pressure difference when a pressure of a gas inside of a core member rises or increases relatively to the outside of a heat exchanger, in the heat exchanger in which the tubular core member is received in an outer tube member, both ends of the outer tube member and the core member are sealed by the caps, and a flow channel is defined between an inner peripheral face of the outer tube member and an outer peripheral face of the core member to circulate a heat medium.SOLUTION: A heat exchanger in which a tubular core member (3) is received inside of an outer tube member (1), caps (2, 2a) are attached to both ends of the outer tubular member (1) and the core member (3) to seal them, and a flow channel (13) is defined between an inner peripheral face of the outer tubular member (1) and an outer peripheral face of the core member (3) to circulate a heat medium, is provided with a sealing structure in which a ventilation hole (25) penetrating through both end faces, is formed between an end face at an outer side and an inner end face of a part attached to the core member (3), of one or both caps with respect to the caps (2, 2a).

Description

  The present invention relates to a heat exchanger sealing structure and a heat exchanger. More specifically, a tubular core member is accommodated in the outer tube member, both ends of the outer tube member and the core member are sealed with caps, and the inner peripheral surface of the outer tube member and the outer peripheral surface of the core member are sealed. In a heat exchanger that circulates a heat medium with a flow path therebetween, when the pressure of the gas inside the core member rises or becomes relatively high compared to the outside of the heat exchanger, the cap is The present invention relates to a sealing structure that prevents it from coming off and a heat exchanger including the same.

  The inventor of the present application has developed a heat exchanger that performs air conditioning by circulating a heat medium inside and exchanging heat with the outside. As shown in FIGS. 1 to 4 of Document 1, a sealing structure using a cap made of synthetic resin that seals the inside is proposed.

  The core member used in the heat exchanger described in Patent Document 1 is a solid body of a square bar shape, and the cap is also formed in accordance with the solid structure of the core member. However, paragraph [0018] of Patent Document 1 also states that “the core portion (core member) may be a solid body or may have a space portion inside, for example, a tubular body”. As described above, it is useful to use not only a solid body but also a tubular body such as a circular pipe as a core member accommodated in the outer tube member.

  In other words, if a tubular core member is used, even if a metal is used as the material of the core member, it can be made sufficiently lightweight while ensuring durability, and the inside of the core member can be evacuated or insulated. If the material is encapsulated, the heat insulation efficiency of the heat exchanger can be increased by providing sufficient heat insulation to the core member, or if a material having high heat storage property is encapsulated to provide sufficient heat storage, Various functionalities can be improved, such as being able to impart heat retention performance when operation is interrupted.

JP 2008-106974 A

However, the heat exchanger disclosed in Patent Document 1 is assumed to have the following inconveniences when the core member is a tubular body.
That is, when a heat medium having a high temperature is circulated in the operation of the heat exchanger, a gas such as air existing in the internal space of the core member is expanded by the heat, and the pressure is increased. Since the conventional heat exchanger has a structure in which caps sealing both ends of the outer tube member are simply press-fitted, there is a possibility that the cap may come off due to pressure during gas expansion.

  Further, for example, when transported by an aircraft with the heat exchanger assembled, the air pressure in the cargo compartment usually changes as the aircraft moves up and down. For this reason, when the aircraft rises, the air pressure in the cargo compartment decreases, and the pressure of the gas existing in the inner space of the core member of the heat exchanger becomes higher than the pressure outside the heat exchanger (cargo compartment). In such a case, the cap may be removed.

(Object of invention)
The present invention accommodates a tubular core member inside the outer tube member, seals both ends of the outer tube member and the core member with caps, and connects the inner peripheral surface of the outer tube member and the outer peripheral surface of the core member. In a heat exchanger that circulates a heat medium with a flow path between them, when the pressure of the gas inside the core member rises or becomes high relative to the outside of the heat exchanger, the cap may come off due to the pressure difference. It is an object of the present invention to provide a sealing structure that prevents the above and a heat exchanger including the same.

The means of the present invention taken to achieve the above object are as follows.
(1) The present invention
A tubular core member is accommodated inside the outer tube member, and a heat medium is circulated as a flow path between the inner peripheral surface of the outer tube member and the outer peripheral surface of the core member, and the outer tube member and the middle member are circulated. A heat exchanger sealing structure for sealing with caps attached to both ends of the core member,
In each of the caps, a vent hole penetrating the both end faces is formed between an end face on the outside of one or both caps and an end face of a portion attached to the core member.
It is the sealing structure of a heat exchanger.

(2) The present invention
A tubular core member is accommodated inside the outer tube member, and a heat medium is circulated as a flow path between the inner peripheral surface of the outer tube member and the outer peripheral surface of the core member, and the outer tube member and the middle member are circulated. A heat exchanger sealing structure in which a first cap is attached to one end side of the core member and a second cap is attached to the other end side and sealed,
The first cap is
An outer tube fitting portion fitted into an end portion of the outer tube member;
Provided on one end side in the longitudinal direction of the outer tube insertion portion, and a core insertion portion to be inserted into an end portion of the core member;
A first flow part for introducing a heat medium into the flow path inside the outer tube member;
With
The second cap is
An outer tube fitting portion fitted into an end portion of the outer tube member;
Provided on one end side in the longitudinal direction of the outer tube insertion portion, and a core insertion portion to be inserted into an end portion of the core member;
A second flow part for discharging the heat medium inside the flow path to the outside of the outer tube member;
With
A vent hole penetrating both end surfaces is formed between one or both outer end surfaces of the first cap and the second cap and an inner end surface of the core insertion portion.
It is the sealing structure of a heat exchanger.

(3) The present invention
A tubular core member is accommodated inside the outer tube member, and a heat medium is circulated as a flow path between the inner peripheral surface of the outer tube member and the outer peripheral surface of the core member, and the outer tube member and the middle member are circulated. A heat exchanger sealing structure in which a first cap is attached to one end side of the core member and a second cap is attached to the other end side and sealed,
The first cap is
An outer tube fitting portion fitted into an end portion of the outer tube member;
Provided on one end side in the longitudinal direction of the outer tube insertion portion, and a core insertion portion to be inserted into an end portion of the core member;
A first flow part for introducing a heat medium into the flow path inside the outer tube member;
With
The second cap is
An outer tube fitting portion fitted into an end portion of the outer tube member;
Provided on one end side in the longitudinal direction of the outer tube insertion portion, and a core insertion portion to be inserted into an end portion of the core member;
A second flow part for discharging the heat medium inside the flow path to the outside of the outer tube member;
With
Between the end face on the outside of one or both of the first cap and the second cap and the end face on the inner side of the core insertion portion, two air holes penetrating both end faces are formed. , A plug is detachably attached to each vent hole.
It is the sealing structure of a heat exchanger.

(4) The present invention
A tubular core member is accommodated inside the outer tube member, and a heat medium is circulated as a flow path between the inner peripheral surface of the outer tube member and the outer peripheral surface of the core member, and the outer tube member and the middle member are circulated. A heat exchanger sealing structure in which a first cap is attached to one end side of the core member and a second cap is attached to the other end side and sealed,
The first cap is
An outer tube fitting portion fitted into an end portion of the outer tube member;
Provided on one end side in the longitudinal direction of the outer tube insertion portion, and a core insertion portion to be inserted into an end portion of the core member;
A first flow part for introducing a heat medium into the flow path inside the outer tube member;
With
The second cap is
An outer tube fitting portion fitted into an end portion of the outer tube member;
Provided on one end side in the longitudinal direction of the outer tube insertion portion, and a core insertion portion to be inserted into an end portion of the core member;
A second flow part for discharging the heat medium inside the flow path to the outside of the outer tube member;
With
A vent hole penetrating both end surfaces is formed between the outer end surface of the first cap or the second cap and the inner end surface of the core insertion portion, and the vent hole has a ventilation hole. A check valve is provided whose direction is from the inside to the outside,
It is the sealing structure of a heat exchanger.

(5) The present invention
The heat exchanger sealing structure according to any one of (1) to (4) is provided.
It is a heat exchanger.

(6) The present invention
A method for inspecting gas leakage using a vent hole of a heat exchanger comprising the heat exchanger sealing structure according to any one of (1) to (4),
A gas supply machine having a supply gas pressure gauge that can supply a test gas having a predetermined pressure into the flow path of the outer tube member and that indicates the pressure of the test gas to be supplied is connected to the flow part of one cap. ,
Attach an internal gas pressure gauge to the circulation part of the other cap,
The gas for inspection is supplied into the flow path from the gas supply machine, and the pressure indicated by the internal gas pressure gauge is reduced by checking whether or not the pressure indicated by the supply gas pressure gauge is reduced. If not, determine that there is no gas leak,
If the pressure indicated by the internal gas pressure gauge is smaller than the pressure indicated by the supply gas pressure gauge, it is determined that there is a gas leak, and the outer pipe member itself or the outer pipe member And the detection gas is detected in the ventilation hole in a state in which ventilation is possible between the inside and the outside of the core member. To determine where the gas is leaking,
This is an inspection method for a gas leak in a heat exchanger.

  The heat exchanger referred to in the present specification and claims of the present application includes, for example, a house, a store, an office, a factory, a gymnasium, a theater, a meeting place, a library, a studio, a hospital, a nursing home, an inn, a hotel, and an event hall. , As an air conditioner or radiant cooling / heating unit for buildings such as warehouses (including cold storage), precision rooms, clean rooms, and aseptic rooms, or as air conditioners and radiant cooling / heating units for agricultural facilities such as poultry houses, pig houses, cowsheds, and greenhouses As a device, or as a water temperature control device for swimming pools, aquariums, farms, hot spring facilities, etc., and also as a humidity control device, drying device, far infrared heating device, snow melting device, heat recovery device, etc. Preferably used.

  The cap material is not particularly limited as long as it can seal the circulating heat medium. For example, various metals such as stainless steel, aluminum and copper, ceramic materials, wood, bamboo, carbon fiber, synthetic fiber Various known materials such as a resin or a composite material thereof can be employed.

  Among them, a synthetic resin having moderate flexibility, elasticity, or deformability is more preferable for improving the adhesion to the inner wall of the outer tube member. For example, polyacetal (for example, DURACON (registered trademark), registered trademark: Plastics), MC nylon (registered trademark: Nippon Polypenco), fluororesin, epoxy glass, phenolic resin, silicon rubber and the like are preferably used.

  As the outer tube member, for example, various metals such as stainless steel and aluminum, synthetic resins including synthetic fibers, carbon fibers, and the like are preferably used.

The heat medium is not specified as long as it can sufficiently store heat energy, and may be liquid or gas.
As the liquid, for example, water (including hot water, cold water, etc.), antifreeze liquid (for example, a 37% solution of propylene glycol mixed with a rust preventive agent: operating temperature range -20 ° C to 70 ° C), oil, etc. are preferable. used. As the gas, for example, a refrigerant gas that can be cooled or heated (in the case of heating: carbon dioxide, in the case of cooling: ammonia, in the case of heating / cooling: a new refrigerant such as HFC (Hydrofluorocarbons)) is preferably used. Is done.

(Work)
The operation of the heat exchanger sealing structure and the heat exchanger according to the present invention will be described.
In assembling the heat exchanger, the outer tube member and the inner core member housed inside the outer tube member are fitted into both ends of the cap so as to press-fit the outer tube insertion portion and the core insertion portion of the cap. Fix it. Thereby, the heat exchanger which has the sealing structure which concerns on this invention at the both ends of a longitudinal direction is formed.

When each cap is press-fitted as described above, if the cap is not provided with a vent hole, the gas in the inner space of the core member is compressed and the gas pressure rises, thereby repelling force when the cap is press-fitted It is conceivable that the press-fitting work becomes difficult due to an increase in the amount of the pressure.
However, in the heat exchanger, since a vent hole penetrating both end surfaces is formed between the end surface of the toe end portion of one or both caps and the end surface of the core insertion portion, in the assembly of the heat exchanger, As described above, when the gas pressure in the inner space of the core member increases, the gas escapes to the outside through the vent hole. As a result, the gas pressure in the inner space is maintained almost constant, and the gas repulsive force It is possible to prevent the cap from being difficult to press-fit.

  Further, when the heat exchanger is assembled as described above, for example, when transported by aircraft, even if the air pressure in the cargo compartment changes due to the rising and lowering of the aircraft, the inner space of the core member is passed through the vent hole. Since the gas outside the heat exchanger flows, the gas pressure inside the core member is almost the same as the outside air pressure. Therefore, the external air pressure decreases and the internal space gas pressure becomes relatively high, as in the case where the cap is not provided with a vent hole and the internal space of the core member cannot be regulated. It is possible to prevent the cap from coming off due to the gas pressure.

  In addition, even when the heat exchanger is in operation, for example, when a high-temperature heat medium is circulated through the flow path during heating, the gas existing in the inner space of the core member expands due to the heat, and the pressure tends to increase. The gas escapes to the outside through the vent hole, and as a result, the gas pressure in the internal space is maintained almost constant, so that the cap that seals both ends with the repulsive force of the gas is removed by the pressure. Can be prevented.

  In the heat exchanger, the sealing structure is formed with two vent holes penetrating both end surfaces between the end surface of the toe end of one cap and the end surface of the core insertion portion. When the plug body is detachably attached, the cap can be easily pressed or removed by the gas pressure when the plug body is removed and the ventilation holes can be vented. The point which makes it possible to prevent this is the same.

  And in order to improve the functionality of a heat exchanger, the substance which has heat storage property can be enclosed, for example in the internal space of a core member. That is, the plug attached to each vent hole is removed, and a substance having heat storage properties is injected from one vent hole. At this time, the gas existing in the inner space of the core member is discharged to the outside through the other vent hole instead, so that the injection of the heat storage substance can be performed smoothly and efficiently. . After injection, the air holes are closed with plugs and a material having heat storage properties is enclosed in the inner space of the core member, and for example, heat retention performance during operation interruption can be imparted to improve functionality. Can do.

  In the heat exchanger, the sealing structure has a vent hole penetrating both end surfaces between the end surface of the toe end portion of one cap and the end surface of the core insertion portion. In the case where a check valve is provided in the direction from the outside to the outside, the cap can be easily press-fitted or gas can be vented from the inner space of the core member to the outside through the check valve. The point that it is possible to prevent the cap from coming off due to the pressure acts similarly.

  And in order to improve the functionality of a heat exchanger, the internal space of a core member can be made into vacuum, for example. That is, a vacuum pump is connected to the check valve of the vent hole, and the gas in the internal space of the core member is sucked to make the inside vacuum. This vacuum state is maintained by the action of the check valve, and heat insulation is imparted to the core member. As a result, almost no heat exchange with the heat medium is performed on the core member side, so that the heat energy of the heat medium is used almost without waste for heat exchange with the outside by the outer tube member. Can be improved.

  Further, according to the gas leakage inspection method using or utilizing the heat exchanger vent, the gas for inspection is sent to the flow path from the gas supply unit, and the pressure indicated by the internal gas pressure gauge is the supply gas. It can be determined that there is no gas leakage if there is no decrease by checking whether or not the pressure is lower than the pressure indicated by the pressure gauge. Further, if the pressure indicated by the internal gas pressure gauge is reduced as compared with the pressure indicated by the supply gas pressure gauge, it can be determined that there is a gas leak. In this case, the outer tube member itself Alternatively, the inspection gas is detected at the close contact portion between the outer tube member and the outer tube insertion portion of each cap, and the inspection gas is detected at the vent hole in a state in which ventilation is possible between the inside and the outside of the core member. By doing so, it can be determined where the gas is leaking.

(A) The present invention accommodates a tubular core member inside an outer tube member, circulates a heat medium using a flow path between the inner peripheral surface of the outer tube member and the outer peripheral surface of the core member, A heat exchanger sealing structure in which caps are attached and sealed at both ends of the member and the core member, and one end face of one or both caps and the end face of the portion attached to the core member in each cap Are formed between the two and both end surfaces, so that when the pressure of the gas inside the core member rises or becomes relatively high compared to the outside of the heat exchanger, the pressure is increased. It is possible to provide a sealing structure that prevents the cap from coming off due to the difference and a heat exchanger including the same.

(B) In the heat exchanger, the sealing structure is formed so as to pass through both end surfaces between the outer end surface of one or both of the first cap and the second cap and the inner end surface of the core insertion portion. If the air holes are formed in two places and the plug body is detachably attached to each vent hole, the cap can be easily press-fitted when the plug body is removed and the vent hole can be vented. For example, in order to improve the functionality of the heat exchanger, the inner space of the core member has heat storage properties. Functionality can be improved, such as being able to enclose a substance and thereby imparting heat retention performance when operation is interrupted.

(C) In the heat exchanger, a vent hole penetrating both end faces is formed between the outer end face of the first cap or the second cap and the inner end face of the core insertion portion. If the air vent is provided with a check valve whose ventilation direction is from the inside to the outside, it is possible to vent from the internal space of the core member to the outside through the check valve. In order to improve the functionality of the heat exchanger, for example, the inner space of the core member is evacuated in order to prevent the cap from coming off due to gas pressure. Accordingly, the thermal energy of the heat medium can be used for heat exchange with the outside by the outer tube member, and the functionality can be improved.

(D) According to the gas leakage inspection method using the vent hole of the heat exchanger according to the present invention, a gas for inspection with a required pressure is sent from the gas supply device to the flow path, and the pressure indicated by the internal gas pressure gauge If there is no decrease, it can be determined that there is no gas leak, and the pressure indicated by the internal gas pressure gauge is the same as the supply gas pressure gauge. If the pressure is lower than the pressure indicated by, it can be determined that there is a gas leak. In this case, furthermore, while detecting the inspection gas at the outer tube member itself or the close contact portion between the outer tube member and the outer tube insertion portion of each cap, it is possible to ventilate the inside and outside of the core member. By detecting the inspection gas in the vent hole, it is possible to determine where the gas is leaking.

The perspective view which shows 1st Embodiment of the heat exchanger which concerns on this invention. Explanatory drawing which showed the sealing structure of the both ends side of the heat exchanger shown in FIG. 1, and abbreviate | omitted the intermediate part of the outer tube | pipe member and the center core member, and partially cut it. The perspective view which shows the structure of the cap based on this invention used for the heat exchanger shown in FIG. Explanatory drawing which showed 2nd Embodiment of the heat exchanger which concerns on this invention, abbreviate | omitted the intermediate part of the outer tube | pipe member and center core member which represented the sealing structure of the both ends side of a heat exchanger, and was partially cut. Explanatory drawing which showed 3rd Embodiment of the heat exchanger which concerns on this invention, and abbreviate | omitted the intermediate part of the outer tube | pipe member and center core member showing the sealing structure of the both ends side of a heat exchanger, and was partially cut. Explanatory drawing which shows the method to test | inspect the gas leak of 1st Embodiment of a heat exchanger.

A first embodiment of a heat exchanger according to the present invention will be described in more detail with reference to FIGS.
The heat exchanger H1 includes a tubular outer tube member 1 having a required length, and caps 2 and 2a for sealing both ends thereof. The heat exchanger H1 heats the outside by circulating a heat medium in the outer tube member 1 and exchanging heat energy of the heat medium with the outside through the peripheral wall of the outer tube member 1. It can be cooled.
Hereinafter, each part will be described in detail.

[Outer tube member 1]
A peripheral wall 10 constituting the outer tube member 1 formed in the circular tube shape has an outer peripheral surface 11 and an inner peripheral surface 12. In addition, the space which arises between the outer peripheral surface 31 of the cylindrical core member 3 mentioned later and the inner peripheral surface 12 of the outer tube member 1 becomes the flow path 13 through which the heat medium flows.
In the present embodiment, the outer tube member 1 is made of aluminum having excellent thermal conductivity, but is not limited to this. As other materials, for example, other types of metals such as stainless steel, synthetic resins including synthetic fibers, carbon fibers, or the like can be used.

  On the outer peripheral surface 11 of the peripheral wall 10 of the outer tube member 1, a fine groove (not shown) having a length over the entire length in the longitudinal direction of the outer tube member 1 is provided in the axial direction in order to increase the surface area and increase the heat exchange efficiency. Many are formed over the entire circumference. In the present embodiment, the groove is substantially serrated in a cross-sectional view, and is formed such that peaks and valleys are alternately continuous, and the peak of the peak is rounded for safety. It is processed to become.

  The mode of the groove is not limited to the above-described mode. For example, the groove is formed so that the peaks and valleys in a semicircular arc shape in cross section are continuously continuous, in the shape of a spur gear in cross section, and other irregularities. A structure in which crests and troughs are alternately formed, or a structure in which a large number of dot-like protrusions such as knurl processing are provided.

  The outer peripheral surface 11 is anodized (alumite treated) of aluminum on the entire surface and is provided with a coating (reference number omitted), which enhances the thermal conductivity, heat dissipation or heat absorption of the outer tube member 1. . Furthermore, the outer peripheral surface 11 may be colored by adsorbing a dye on the surface during anodizing.

  The inner peripheral surface 12 of the peripheral wall 10 is provided on its entire surface with a coating (not shown) for improving the adhesion with the outer tube fitting portion 21 of the caps 2 and 2a described later. It is formed by processing (alumite processing). In addition, the part which provides a film in the internal peripheral surface 12 may be only the part which contact | connects the surface of the outer tube insertion part 21 of the caps 2 and 2a.

The coatings provided on the outer peripheral surface 11 and the inner peripheral surface 12 are not limited to those by the alumite treatment, and take into account liquid resistance, heat resistance, chemical resistance, etc. according to the circulating heat medium. Alternatively, it can be formed of a known material suitable for the functionality to be added.
As the coating, for example, a paint, a coating agent, or the like can be used. When the outer tube member 1 is made of aluminum as described above, anodization (alumite treatment) of aluminum colored by adsorbing a dye on the surface, etc. Are preferably used.

  Furthermore, in order to increase the heat exchange efficiency of the heat exchanger H1, a coating excellent in thermal conductivity, heat dissipation and heat absorption can be provided on the outer peripheral surface 11 and the inner peripheral surface 12 of the outer tube member 1. Further, in order to suitably adjust the humidity outside the outer tube member 1 of the heat exchanger, a coating film excellent in hydrophilicity, moisture absorption and moisture release can be provided on the outer peripheral surface 11. Furthermore, in order to improve VOC (volatile organic compounds) and odor outside the outer tube member 1 of the heat exchanger H1, and to clean the air, a coating with excellent adsorptive decomposability and antibacterial properties is provided. be able to. It is also possible to provide a coating containing a substance having an excellent ability to generate negative ions that can provide an environmental healing space.

  Examples of the hydrophilic, hygroscopic, moisture releasing or adsorptive decomposable and antibacterial coating include, for example, charcoal such as activated carbon, activated alumina, silica gel, titanium dioxide, sodium polyacrylate cross-linked body, titanium oxide, ion exchange resin, Although what mixed bentonite, diatomaceous earth, etc. is mentioned, it is not limited to these. Moreover, as a film | membrane which generate | occur | produces a negative ion, although what mix | blended charcoal, ceramics, tourmaline, etc., such as activated carbon, is mentioned, for example, It is not limited to these. In addition, as long as the raw material of the outer tube member 1 has sufficient functionality, the coating is not necessarily provided.

[Caps 2, 2a]
The caps 2 and 2a are formed of polyacetal, which is a synthetic resin, and are fitted and fixed to both end portions (inflow side and outflow side) of the outer tube member 1, respectively. The caps 2 and 2a are fixed in the same manner by the mounting method and mounting structure described later. The other structures of the caps 2 and 2a are the same except that the cap 2 on the left side in FIGS. 1 and 2 has a vent hole 25 described later and the cap 2a does not have the vent hole 25.

First, the structure of the cap 2 that is the first cap having the air holes 25 will be described.
The cap 2 has a stop end portion 20 having the same outer diameter as the outer diameter of the peripheral wall 10 of the outer tube member 1, and an outer tube insertion portion 21 that is fitted with a diameter slightly larger than the inner diameter of the peripheral wall 10 of the outer tube member 1. In addition, a central core insertion portion 22 provided on the front side of the outer tube insertion portion 21 (on the side opposite to the stop end portion 20) is integrally provided.

  On the outer peripheral portion of the outer tube fitting portion 21, concave grooves 210 and 211 are formed at two positions in the longitudinal direction of the outer tube fitting portion 21 over the entire circumference at a required interval. The outer tube insertion portion 21 has a shape in which the outer peripheral portion of the outer tube insertion portion 21 is divided into three parts by concave grooves 210 and 211, and the outer peripheral portions are seal portions 212, 213, and 214, respectively. . As described above, the seal portions 212, 213, and 214 are slightly larger in diameter than the inner diameter of the outer tube member 1.

  The core insertion portion 22 is formed with a smaller diameter than the outer tube insertion portion 21 and is slightly larger in diameter than the inner diameter of the core member 3 described later. The core insertion portion 22 can be sealed in the watertight state and the airtight state of the core member 3 by being fitted into the core member 3 together with the core insertion portion 22 of the cap 2a described later.

  As described above, the outer diameter of the inner core insertion portion 22 and the outer diameter of the outer tube insertion portion 21 are different (the inner core insertion portion 22 is smaller in diameter), and the distance between both portions (boundary portion) is the tip direction ( It is formed so as to be narrowed toward the center core insertion portion 22). The narrowed portion is located in the flow path 13 and serves as a flow surface 23 in which a later-described distribution path 241 is opened.

  On the outer peripheral portion of the center core insertion portion 22, a single groove 220 is formed over the entire circumference at a substantially central portion in the longitudinal direction of the center core insertion portion 22. In addition, the outer peripheral part of the center core insertion part 22 becomes a shape divided into two by the concave groove 220, and becomes the seal parts 221 and 222, respectively. As described above, the seal portions 221 and 222 are slightly larger in diameter than the inner diameter of the core member 3.

  A connecting member 24 is attached to the cap 2 in the direction of the central axis from the center of the outer end surface of the toe 20 toward the inside. The connection member 24 is a cylindrical body that can introduce a heat medium from the outside of the outer tube member 1 into the outer tube member 1 or discharge the heat medium from the inside of the outer tube member 1 to the outside of the outer tube member 1. The inside is a circulation part 240 that is a first circulation part through which a heat medium circulates (a circulation part 240 of the cap 2a described later becomes a second circulation part). A threaded portion 242 is provided at the distal end portion of the connecting member 24 (portion protruding outward from the toe portion 20), and the threaded portion 242 is a hose or a flow channel pipe (not shown) serving as a heat medium flow path. ) Etc.

  An end portion on the inner side of the circulation portion 240 is extended to a substantially intermediate portion in the longitudinal direction at the outer tube insertion portion 21 of the cap 2. Eight distribution paths 241 penetrating from the circulation part 240 to the circulation surface 23 are branched and formed at the inner end of the circulation part 240. The distribution paths 241 are formed at equal intervals in the axial circumferential direction of the cap 2 and in the radial direction from the flow portion 240.

  In the present embodiment, the connecting member 24 is formed by inserting and fixing a cylinder having a required length having a screw portion 242 into a hole formed in the cap 2 and connected to each distribution path 241. However, it is not limited to this, For example, what was shape | molded integrally with the cap 2 may be used.

  Further, the cap 2 is formed with a vent hole 25 at one location through the both end surfaces of the toe portion 20 and the outer tube insertion portion 21. The vent hole 25 is formed at a position that is parallel to the central axis of the cap 2 and does not overlap the circulation portion 240 and each distribution path 241. The vent hole 25 is not limited to the above structure as long as the inner space 33 of the core member 3 and the outside of the heat exchanger H1 can communicate with each other when the cap 2 is attached to the outer tube member 1.

  The cap 2a, which is the second cap that forms a pair with the cap 2, has the same difference except that the vent hole 25 formed in the cap 2 is not formed. The detailed description will be omitted using the description of the structure of the cap 2. In FIG. 2, the same reference numerals are given to the same portions of the cap 2 a as the cap 2.

[Core member 3]
The core member 3 is an aluminum circular tube formed in a cylindrical shape whose both ends are open, and the peripheral wall 30 has an outer peripheral surface 31 and an inner peripheral surface 32. The interior of the peripheral wall 30 is an internal space 33. The core member 3 is housed inside the outer tube member 1, and both end openings are fitted to the respective core core fitting portions 22 of the caps 2, 2 a that are fitted to both ends of the outer tube member 1. Thereby, the space part produced between the outer peripheral surface 31 of the core member 3 and the inner peripheral surface 12 of the outer tube member 1 becomes the flow path 13 through which the heat medium flows as described above.

  The shape of the core member 3 is not limited to the cylindrical shape. For example, if the flow path can be formed in cooperation with the outer tube member 1, for example, a triangular cylindrical shape, a rectangular cylindrical shape, a pentagonal cylindrical shape, a hexagonal shape Various polygonal cylinder shapes such as a cylindrical shape or an octagonal cylindrical shape may be used. The material of the core member 3 is not limited to the above material, and may be other types of metals such as stainless steel, synthetic resin including synthetic fibers, carbon fibers, or the like.

(Work)
With reference to FIG. 1 thru | or FIG. 3, the effect | action of the heat exchanger H1 which concerns on this Embodiment is demonstrated.

For example, the heat exchanger H1 is assembled as follows.
First, the core insertion portion 22 of the cap 2 is fitted into one end portion of the core member 3 and press-fitted. Next, the core member 3 fitted to the cap 2 as described above is inserted into one end side of the outer tube member 1 and the outer tube fitting portion 21 of the cap 2 is inserted into one end portion of the outer tube member 1. Fit and press fit.
Then, the cap 2 a is press-fitted into the other end side of the outer tube member 1. At this time, the center core insertion portion 22 of the cap 2 a is internally fitted to the other end portion of the core member 3, and the outer tube insertion portion 21 is internally fitted to the other end portion of the outer tube member 1.

  Since the inner peripheral surface 12 of the outer tube member 1 is provided with a film on which anodization of aluminum has been performed, when the caps 2 and 2a are press-fitted as described above, the caps 2 and 2a are formed by the film. The adhesiveness of the portion of the outer tube fitting portion 21 that comes into contact with the seal portions 212, 213, and 214 is further enhanced, and sealing can be performed with sufficient liquid tightness and air tightness. By this press fitting, the caps 2 and 2 a are fixed to both ends of the outer tube member 1 and the core member 3.

  When the cap 2a is finally press-fitted as described above, the gas in the inner space 33 of the core member 3 is compressed and the gas pressure is increased unless the cap 2 has the vent hole 25. It is considered that the repulsive force increases and the press-fitting work becomes difficult. However, in assembling the heat exchanger H1, when the gas pressure in the internal space 33 rises, the gas escapes to the outside through the vent hole 25, and the gas pressure in the internal space 33 is maintained almost constant. It is possible to prevent the cap 2a from being difficult to press-fit with force.

  When the inner peripheral surface 12 of the outer tube member 1 and the seal portions 212, 213, and 214 of the outer tube fitting portion 21 of the caps 2 and 2a are in close contact, the space portion 215 formed by the concave grooves 210 and 211 is temporarily sealed. Even when a small amount of heat medium leaks due to scratches or the like generated at a location where the portion 212 and the inner peripheral surface 12 are in close contact with each other, the space portion 215 becomes a liquid stop (a liquid pool), and further, the toe portion It is possible to prevent the heat medium from leaking to the 20 side.

  The heat exchanger H1 provided with the sealing structure is used alone or connected in series or in parallel. And heat exchanger H1 can exhibit the function to heat or cool the installed facilities etc., if a heat carrier of either hot or cold is circulated through channel 13. The temperature of the heat medium to be circulated is appropriately set depending on the installation location and application, and is not particularly limited. Moreover, a higher heating effect or cooling effect can be expected from the air conditioner having the required number of heat exchangers H1 by the same action as described below.

  The heat exchanger H1 is installed in the air in a house or other facility, so that, for example, the surface of the outer tube member 1 is exposed to the space with a required length. The heat medium is heated or cooled to a required temperature by a temperature controller (not shown) provided in a flow path (not shown), and sent to the heat exchanger H1 by a pump (not shown).

The heat medium sent to the heat exchanger H <b> 1 is introduced into the flow part 240 of the connection member 24 of the cap 2, and further sent to the flow path 13 via each distribution path 241.
The heat medium passing through the flow path 13 directly exchanges heat with the peripheral wall 10 of the outer tube member 1, and the outside air or surrounding substances in contact with the outer peripheral surface 11 of the outer tube member 1 pass through the outer tube member 1. Heat exchange indirectly with the heat medium. This heat exchange is performed by heat transfer by conduction, radiation or convection.

  That is, if the temperature of the peripheral wall 10 of the outer tube member 1 exchanged with the heat medium is higher than the temperature of the outside air or material, the temperature of the outside air or material increases due to heat exchange between the outer tube member 1 and the outside air or material. The temperature of the medium decreases. Conversely, if the temperature of the outer tube member 1 exchanged with the heat medium is lower than the outside air or substance, the temperature of the outside air or substance is lowered by heat exchange between the outer tube member 1 and the outside air or substance. The temperature goes up.

  Further, when the heat exchange is performed, the heat medium is distributed by the respective distribution paths 241 as described above, so that the flow rate and the flow velocity are almost equal in the flow path 13. In addition, the heat medium flowing inside the outer tube member 1 does not flow through the central portion of the outer tube member 1 in which the core member 3 is accommodated, and is in contact with almost the entire inner peripheral surface 12 of the outer tube member 1. In this way, it flows in the flow path 13.

  That is, the inner peripheral surface 12 that can exchange heat directly without flowing a heat medium through the central portion of the outer tube member 1 that cannot exchange heat directly with the peripheral wall 10 of the outer tube member 1. More efficient heat exchange is possible by flowing so as to be in contact with. Moreover, air is usually contained in the internal space 33 of the core member 3 and is relatively excellent in heat insulation, and heat exchange is hardly performed between the heat medium and the core member 3. , More efficient. Thereby, the heat exchanger H1 can raise or lower the temperature of the outer tube member 1 to a predetermined temperature in a relatively short time.

  For example, when comparing a general tubular heat exchanger that does not have the core member 3 and the heat exchanger H1 according to the present embodiment, if the flow rate of the heat medium is the same, that is, the amount of heat supplied is In the same case, the heat exchanger H1 of the present invention can raise or lower the temperature of the outer tube member 1 to a predetermined temperature in a shorter time. In other words, the temperature rise of the surface of the outer tube member 1 is quick. Moreover, if the rise time of the temperature of the surface of the outer tube member 1 is used as a reference, it can be said that equivalent heating can be performed with a smaller flow rate (a smaller amount of heat supply).

  Moreover, since the outer peripheral surface 11 of the outer tube member 1 is provided with a coating (a layer of anodizing treatment of aluminum) that enhances thermal conductivity, heat dissipation or heat absorption, the outer tube member 1 and the outside air Heat exchange is performed efficiently and satisfactorily. Furthermore, the groove provided on the outer peripheral surface 11 has a larger surface area than a normal (surface-unprocessed) tubular body having the same diameter, so that heat exchange efficiency is excellent, and heating or cooling of the outside air is performed quickly. Can do.

  Further, in the case where the heat exchanger H1 is assembled as described above, for example, when transported by an aircraft, even if the air pressure in the cargo compartment changes due to the rising and lowering of the aircraft, the core member 3 Since the gas outside the internal space 33 and the heat exchanger H1 circulates, the gas pressure inside the core member 3 becomes almost the same as the outside air pressure. Therefore, the external air pressure decreases and the gas pressure in the internal space 33 becomes relatively high, as in the case where the cap 25 is not provided with the vent hole 25 and the internal space 33 of the core member 3 cannot be regulated. Thus, it is possible to prevent the cap from coming off due to the gas pressure.

  Further, even during operation of the heat exchanger H1, for example, when a high-temperature heat medium is circulated through the flow path 13 during heating, the gas existing in the internal space 33 of the core member 3 expands due to the heat and the pressure is increased. When the gas is going to rise, the gas escapes to the outside through the vent hole 25. As a result, the gas pressure in the internal space 33 is maintained almost constant, so that the cap 2 is sealed at both ends by the repulsive force of the gas. 2a can be prevented from coming off by the pressure. In the present embodiment, the cap 2 having the vent hole 25 is attached only to one end side of the heat exchanger H1, but the cap 2 is fixed to both end sides of the heat exchanger H1 and the vent hole 25 is provided on both sides. , Smoother ventilation (pressure regulation) may be performed.

  As a means for giving heat energy to the heat medium, for example, a heating device or a heat pump using solar heat, geothermal power, wind power, hydraulic power, electric power, etc., a heat pump, an air heat source, etc. are preferably used. It may be known means. In addition, secondary products such as waste heat may be used without being discarded. For example, by using a material having a high heat capacity or a good heat storage property in the heat storage section, the heat accumulated in the daytime may be used. Can be used at night, or the heat accumulated at night can be used during the day. In the latter case, the energy cost can be reduced by using late-night power.

  Next, with reference to FIG. 4, the heat exchanger H2 which is 2nd Embodiment of a heat exchanger is demonstrated. In FIG. 4, the same or equivalent portions as those of the heat exchanger H <b> 1 are denoted by the same reference numerals, and redundant description of the structure is omitted.

  The heat exchanger H2 is different from the structure of the cap 2 of the heat exchanger H1 in the structure of the cap 2b, which is the first cap used in the sealing structure on one side (left side in FIG. 4). The other parts have the same structure as the heat exchanger H1. The circulation part 240 provided in the cap 2b serves as a first circulation part, and the circulation part 240 provided in the second cap 2a serves as a second circulation part.

  The cap 2b is formed with two vent holes 25b penetrating through both end surfaces of the toe portion 20 and the outer tube fitting portion 21. In each vent 25b, a plug 26 is screwed to the mouth on the end face side of the toe 20. The airtightness and liquid tightness can be maintained between the air holes 25b and the plugs 26 by the packing 260. As a result, the plug body 26 can be screwed and tightened, or loosened and removed to allow ventilation through the ventilation hole 25b and ventilation blocking.

  Further, in this structure, when the plug body 26 is removed and each vent hole 25 can be ventilated, the caps 2a and 2b can be easily press-fitted, and the caps 2a and 2b can be detached due to gas pressure. The point that can be prevented is the same as the heat exchanger H1.

  And in the heat exchanger H2, in order to improve functionality, the substance which has heat storage property can be enclosed in the internal space 33 of the core member 3, for example. First, the plug body 26 attached to each vent hole 25b of the heat exchanger H2 is loosened and removed, and the cap 2b is set upward. Next, a substance having heat storage properties is injected from one vent hole 25. Examples of the substance having heat storage properties include, but are not limited to, oil, antifreeze liquid, glycerin, and silicon liquid.

  At this time, since the gas in the inner space 33 of the core member 3 is discharged to the outside through the other vent hole 25b instead, the injection of the heat storage substance is performed smoothly and efficiently. be able to. After the injection, the air holes 25b are closed by the plugs 26, and a substance having heat storage properties is sealed in the internal space 33 of the core member 3, for example, a heat retention performance at the time of operation interruption can be given. Can be improved.

  Next, with reference to FIG. 5, the heat exchanger H3 which is 3rd Embodiment of a heat exchanger is demonstrated. In FIG. 5, the same or equivalent parts as those of the heat exchanger H <b> 1 are denoted by the same reference numerals, and redundant description of the structure is omitted.

  The heat exchanger H3 is different from the structure of the cap 2 of the heat exchanger H1 in the structure of the cap 2c, which is the first cap used in the sealing structure on one side (left side in FIG. 5). The other parts have the same structure as the heat exchanger H1. The circulation part 240 provided in the cap 2c serves as a first circulation part, and the circulation part 240 provided in the second cap 2a serves as a second circulation part.

  The cap 2c penetrates through both end surfaces of the toe portion 20 and the outer tube fitting portion 21, and a vent hole 25c is formed at one place. A check valve 27 is attached to a mouth portion on the end face side of the stop end portion 20 in the vent hole 25c. The check valve 27 has a structure in which the ventilation direction is limited from the inner space 33 of the core member 3 to the outer direction, and ventilation is not possible in the reverse direction.

  The heat exchanger H3 having a sealing structure using the cap 2c can vent the inner core member 3 from the inner space 33 through the check valve 27 to the outside, so that the heat exchanger H3 is similar to the heat exchanger H1. The caps 2a and 2c can be easily press-fitted, and the caps 2a and 2c can be prevented from coming off due to gas pressure, which is the same as the heat exchanger H1.

  And in the heat exchanger H3, in order to improve functionality, the internal space 33 of the core member 3 can be evacuated. That is, a vacuum pump (not shown) is connected to the check valve 27 of the vent hole 25b, and the gas in the internal space 33 of the core member 3 is sucked to make the inside vacuum. This vacuum state is maintained by the action of the check valve 27, and heat insulation is imparted to the core member 3.

  Thereby, on the side of the core member 3, since heat exchange with the heat medium is hardly performed except for heat exchange with the peripheral wall 30, the heat energy of the heat medium is exchanged with the outside by the outer tube member 1. Functionality can be improved, such as being used almost without waste.

Next, with reference to FIG. 6, taking the heat exchanger H1 as an example, a method for inspecting a gas leak in the heat exchanger H1 will be described.
This inspection method uses the vent hole 25 provided in the cap 2, and uses the outer tube member 1 itself of the heat exchanger H1 or the close contact portion between the outer tube member 1 and the outer tube fitting portion 21 of each cap 2, 2a, or The gas leakage is inspected from the contact portion between the core member 3 itself or the core member 3 and the core insertion portion 22 of each cap 2, 2a.

  Note that this inspection method can be similarly used in the heat exchanger H2 and the heat exchanger H3 as long as the air can be vented through the vent holes 25b and 25c (the vent hole 25c can be vented as it is). It can be done.

  First, the gas supply machine 4 is connected to the flow part 240 of the connection member 24 of the one cap 2a. The gas supply machine 4 can supply a test gas having a predetermined pressure into the flow path 13 of the outer tube member 1 through the connection member 24. The gas supply unit 4 includes a supply gas pressure gauge 40 that measures the pressure of the inspection gas to be supplied.

Further, the internal gas pressure gauge 41 is attached to the flow part 240 of the connection member 24 of the other cap 2. The internal gas pressure gauge 41 can measure the gas pressure in the flow path 13.
Next, whether or not the pressure indicated by the internal gas pressure gauge 41 is reduced compared to the pressure indicated by the supply gas pressure gauge 40 is sent from the gas supply machine 4 to the flow path 13 for the required pressure. If there is no decrease, it is determined that there is no gas leakage.

  On the other hand, if the pressure indicated by the internal gas pressure gauge 41 is reduced as compared with the pressure indicated by the supply gas pressure gauge 40, the outer tube member 1 itself or the outer tube member 1 of the heat exchanger H1 Any portion of the close contact portion of the caps 2 and 2a with the outer tube insertion portion 21 or the close contact portion between the core member 3 itself or the core member 3 and the core insertion portion 22 of the caps 2 and 2a (or Judge that there is gas leakage from multiple locations. This gas leakage may lead to liquid leakage of the heat medium from the flow path 13 to the internal space 33 of the core member 3.

  In this case, a gas detector (not shown) is used to detect the test gas at the outer tube member 1 itself or at the close contact portion between the outer tube member 1 and the outer tube insertion portion 21 of each cap 2, 2a. . In the inspection, for example, a portable detector is used as a gas detector, and the detection is performed by a method that addresses a portion where the tip of the detection portion may leak. Similarly, the inspection gas is detected at the outlet of the vent hole 25 through which air can pass between the internal space 33 of the core member 3 and the outside. Thereby, it can be specified where gas is leaking from among the respective locations.

  As the inspection gas, for example, helium, nitrogen, alternative chlorofluorocarbon, or the like can be used, but is not limited thereto. Further, when these gases are used, it is possible to detect a gas leak by detecting a change in oxygen concentration. In addition, alternative fluorocarbons can be detected by a dedicated detector.

  The terms and expressions used in the claims and in the present specification are merely explanatory and are not limiting at all, and are equivalent to the features described in the present specification and parts thereof. There is no intention to exclude terms or expressions. Further, it goes without saying that various modifications are possible within the scope of the technical idea of the present invention.

H1 heat exchanger 1 outer tube member 10 peripheral wall 11 outer peripheral surface 12 inner peripheral surface 13 flow path 2 cap 2a cap 20 stop end portion 21 outer tube fitting portion 210, 211 concave groove 212, 213, 214 seal portion 215 space portion 22 Core insertion portion 220 Concave groove 221, 222 Seal portion 23 Flow surface 24 Connection member 240 Flow portion 241 Distribution path 242 Screw portion 25 Vent 3 Central core member 30 Peripheral wall 31 Outer peripheral surface 32 Inner peripheral surface 33 Internal space H2 Heat exchanger 2b Cap 25b Ventilation hole 26 Plug body 260 Packing H3 Heat exchanger 2c Cap 25c Ventilation hole 27 Check valve 4 Gas supply machine 40 Supply gas pressure gauge 41 Internal gas pressure gauge

Claims (6)

A tubular core member is accommodated inside the outer tube member, and a heat medium is circulated as a flow path between the inner peripheral surface of the outer tube member and the outer peripheral surface of the core member, and the outer tube member and the middle member are circulated. A heat exchanger sealing structure for sealing with caps attached to both ends of the core member,
In each of the caps, a vent hole penetrating the both end faces is formed between an end face on the outside of one or both caps and an end face of a portion attached to the core member.
Seal structure of heat exchanger. A tubular core member is accommodated inside the outer tube member, and a heat medium is circulated as a flow path between the inner peripheral surface of the outer tube member and the outer peripheral surface of the core member, and the outer tube member and the middle member are circulated. A heat exchanger sealing structure in which a first cap is attached to one end side of the core member and a second cap is attached to the other end side and sealed,
The first cap is
An outer tube fitting portion fitted into an end portion of the outer tube member;
Provided on one end side in the longitudinal direction of the outer tube insertion portion, and a core insertion portion to be inserted into an end portion of the core member;
A first flow part for introducing a heat medium into the flow path inside the outer tube member;
With
The second cap is
An outer tube fitting portion fitted into an end portion of the outer tube member;
Provided on one end side in the longitudinal direction of the outer tube insertion portion, and a core insertion portion to be inserted into an end portion of the core member;
A second flow part for discharging the heat medium inside the flow path to the outside of the outer tube member;
With
A vent hole penetrating both end surfaces is formed between one or both outer end surfaces of the first cap and the second cap and an inner end surface of the core insertion portion.
Seal structure of heat exchanger. A tubular core member is accommodated inside the outer tube member, and a heat medium is circulated as a flow path between the inner peripheral surface of the outer tube member and the outer peripheral surface of the core member, and the outer tube member and the middle member are circulated. A heat exchanger sealing structure in which a first cap is attached to one end side of the core member and a second cap is attached to the other end side and sealed,
The first cap is
An outer tube fitting portion fitted into an end portion of the outer tube member;
Provided on one end side in the longitudinal direction of the outer tube insertion portion, and a core insertion portion to be inserted into an end portion of the core member;
A first flow part for introducing a heat medium into the flow path inside the outer tube member;
With
The second cap is
An outer tube fitting portion fitted into an end portion of the outer tube member;
Provided on one end side in the longitudinal direction of the outer tube insertion portion, and a core insertion portion to be inserted into an end portion of the core member;
A second flow part for discharging the heat medium inside the flow path to the outside of the outer tube member;
With
Between the end face on the outside of one or both of the first cap and the second cap and the end face on the inner side of the core insertion portion, two air holes penetrating both end faces are formed. , A plug is detachably attached to each vent hole.
Seal structure of heat exchanger. A tubular core member is accommodated inside the outer tube member, and a heat medium is circulated as a flow path between the inner peripheral surface of the outer tube member and the outer peripheral surface of the core member, and the outer tube member and the middle member are circulated. A heat exchanger sealing structure in which a first cap is attached to one end side of the core member and a second cap is attached to the other end side and sealed,
The first cap is
An outer tube fitting portion fitted into an end portion of the outer tube member;
Provided on one end side in the longitudinal direction of the outer tube insertion portion, and a core insertion portion to be inserted into an end portion of the core member;
A first flow part for introducing a heat medium into the flow path inside the outer tube member;
With
The second cap is
An outer tube fitting portion fitted into an end portion of the outer tube member;
Provided on one end side in the longitudinal direction of the outer tube insertion portion, and a core insertion portion to be inserted into an end portion of the core member;
A second flow part for discharging the heat medium inside the flow path to the outside of the outer tube member;
With
A vent hole penetrating both end surfaces is formed between the outer end surface of the first cap or the second cap and the inner end surface of the core insertion portion, and the vent hole has a ventilation hole. A check valve is provided whose direction is from the inside to the outside,
Seal structure of heat exchanger. It has the heat exchanger sealing structure according to any one of claims 1 to 4.
Heat exchanger. A gas leakage inspection method using a vent hole of a heat exchanger comprising the heat exchanger sealing structure according to any one of claims 1 to 4,
A gas supply machine having a supply gas pressure gauge that can supply a test gas having a predetermined pressure into the flow path of the outer tube member and that indicates the pressure of the test gas to be supplied is connected to the flow part of one cap. ,
Attach an internal gas pressure gauge to the circulation part of the other cap,
The gas for inspection is supplied into the flow path from the gas supply machine, and the pressure indicated by the internal gas pressure gauge is reduced by checking whether or not the pressure indicated by the supply gas pressure gauge is reduced. If not, determine that there is no gas leak,
If the pressure indicated by the internal gas pressure gauge is smaller than the pressure indicated by the supply gas pressure gauge, it is determined that there is a gas leak, and the outer pipe member itself or the outer pipe member And the detection gas is detected in the ventilation hole in a state in which ventilation is possible between the inside and the outside of the core member. To determine where the gas is leaking,
Inspection method for heat exchanger gas leaks.

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