JP2017078545A - Double-pipe heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a double-pipe heat exchanger that is free of a risk of fluid mixing and enables leakage of fluid to be visually confirmed in such a case although achieving space-saving wiring by constituting a connector of the double-pipe heat exchanger in one body.SOLUTION: A double-pipe heat exchanger has a structure such that: a head part connected to an inner pipe 100 and an outer pipe 200 consists of a main body 340 and an adapter 350; an inner pipe mounting part has an insert 363 inserted into the inner pipe 100; an elastic body 341 is arranged on the circumference of a through hole between the head part body 340 and adapter 350; when the had part body 340 and adapter 350 are united with a fixture 342, the elastic body 341 is compressed to compress the inner pipe 100 radially, which is pressed by the elastic body 341 and the insert 363 of the inner pipe mounting part.SELECTED DRAWING: Figure 2

Description

The present invention relates to a heat exchanger. In particular, the present invention relates to a double-tube heat exchanger whose tube is made of a polymer.

Using an inner tube and an outer tube with different diameters, the inner tube is inserted into the outer tube to form a double structure, and heat is exchanged between the fluid flowing through the inner tube and the outer tube through the inner wall of the inner tube. Double pipe heat exchangers are known. For example, in prior art document 1, in order to provide a heat exchanger that is lightweight and eliminates the risk of leakage due to corrosion of the outer tube, a double tube type in which the inner tube is formed of metal and the outer tube is formed of resin. A heat exchanger is described.

JP 2002-162175 A

The conventional double pipe heat exchanger described above has a structure in which a joint is attached to the tip of an inner pipe penetrating the connecting tool, and the outer pipe side fluid is sealed by the connecting tool and the inner pipe. The inner pipe side fluid is sealed so that it does not leak to the outside with a joint for connecting the inner pipe to the existing pipe, and there are seals at different locations on the outer pipe side and the inner pipe side. Even in this case, the possibility that the outer pipe side fluid and the inner pipe side fluid are mixed is low. However, in addition to the connection of the outer pipe and the connection that is the flow path for the outer pipe-side fluid, a joint for connecting the inner pipe to the existing pipe is also required, which requires extra space for installation. Become. To improve the above installation space, adjust the inner pipe to a length that does not penetrate the connection tool, and connect the inner pipe to the existing pipe in the connection tool. A monolithic structure having a connecting mechanism of the above can be considered. However, in this case, the seal part for the outer pipe side fluid and the seal part for the inner pipe side fluid function in one place. If leakage occurs at the seal part, the outer pipe side fluid and the inner pipe side fluid may be contaminated. is there.

The present invention has been made in view of the problems as described above, and it is possible to perform piping in a space-saving manner by integrally configuring the connector of the double-pipe heat exchanger. There is provided a double-tube heat exchanger that can be visually confirmed when there is no leakage and fluid leakage occurs.

The present inventor has earnestly studied a structure that solves the above-described problems, and even when fluid leaks from the inner tube and the outer tube while integrating the connecting member for connecting the tube, the fluid is completely isolated, Furthermore, it came to invent the double pipe type heat exchanger of the connection structure which can be confirmed early by visual observation.

That is, in order to achieve the above object, in the double tube heat exchanger of the present invention, the head portion connected to the inner tube and the outer tube comprises a main body, an adapter, an outer tube mounting portion, and an inner tube mounting portion. The main body of the head part has a joint part of the outer pipe mounting part, a through hole serving as a flow path of the outer pipe side fluid and an inner pipe insertion path, and a branch of the flow path of the outer pipe side fluid. Has a through hole extending from the head body and a joint portion of the inner tube mounting portion. The inner tube mounting portion has an insert to be inserted into the inner tube, and is attached to the adapter side surface of the head portion main body. A notch for arranging an elastic body is formed on the circumference of the through-hole, and an elastic body made of synthetic resin formed in a substantially ring shape is arranged in this notch, and the head body and the adapter are fixed. When integrated by the tool, the elastic body is compressed and tightly contacts the inner surface of the notch and the adapter surface, and the inner tube is radially Contraction, and characterized in that it is a structure for pressing the inner tube in the insert of the inner tube mounting portion and the elastic member.

Furthermore, the outer tube of the double-pipe heat exchanger is formed of a tube containing a synthetic resin or a bellows-shaped metal tube. The inner tube is made of a fluorine resin or a silicone resin. With such a configuration, the double tube has flexibility and can be deformed according to the shape and size of the place where it is installed. In addition, the inner tube is made of fluororesin or silicone resin, so it can be used for applications that require low elution and cleanliness, and because it is heat resistant, it can be used with high-temperature fluids and steam sterilization. This is preferable.

It is the external appearance schematic of an example of the double tube | pipe type heat exchanger of this invention. It is an exploded view of the head part of the double tube type heat exchanger of an embodiment of the present invention. It is a partially cutaway sectional view showing the assembled state of the head part of the double tube heat exchanger of the embodiment of the present invention.

Embodiments of the present invention will be described below with reference to the drawings. The embodiments described below do not specify the invention according to the claims, and all the features described in the embodiments are not necessarily essential to the establishment of the present invention.

FIG. 1 is a schematic external view of the entire double tube heat exchanger of the present invention, FIG. 2 is an exploded view of the head portion thereof, and FIG. 3 is a diagram showing a state in which the head portion of the double tube heat exchanger is assembled. FIG.

The double-pipe heat exchanger of this embodiment is flexible and can be deformed in accordance with the space and shape of the place where it is desired to be installed. Commercial products can be used. As shown in FIG. 1, the double-tube heat exchanger 1 of the present embodiment has an inner tube 100 made of synthetic resin inserted into an outer tube 200 made of a flexible tube, and heads at both ends thereof. Wearing part 300. The head unit 300 has a function of connecting the inner tube 100 and the outer tube 200 and connecting the double-pipe heat exchanger 1 to a pipe (not shown). The head unit 300 includes an outer tube mounting unit 330 for mounting the outer tube 200, a head unit body 340, an adapter 350, and an inner tube mounting unit 360. FIG. 2 is an exploded view of the head portion, and FIG. 3 is a view showing an assembled state of the head portion. The head body 340 is formed with a through hole that is inserted through the inner tube and is also a flow path for the outer tube side fluid, and a notch 346 is formed around the through hole on the side surface of the adapter 350 side of the main body 340. An elastic body 341 made of synthetic resin is disposed in the notch 346. The elastic body 341 is located between the head body 340 and the adapter 350. The head body 340 and the adapter 350 are fixed and integrated by a fixing tool 342. By tightening the fixing tool 342, the elastic body 341 is compressed, closely contacts the inner surface of the notch 346 and the surface of the adapter 350, and compresses the inner tube 100 in the radial direction. The adapter 350 is provided with a joint portion 351 with the inner tube mounting tool 360. By the joint portion 351, the cap nut 361 of the inner pipe mounting portion 360 is fixed. The adapter itself may have the function of a cap nut of the inner tube mounting portion 360. In this case, the inner tube mounting portion on which the inner tube is mounted is directly joined to the adapter. The inner pipe mounting portion 360 compresses the inner pipe 100 with a bamboo shoot-shaped insert 363 and a cap nut 361, and seals the fluid inside the inner pipe 100 from leaking to the outside. The insert 363 of the inner tube mounting portion 360 supports the inner tube 100 from the inside by setting the length of the insert 363 so as to reach the position where the inner tube 100 receives the compression force by the elastic body 341. Therefore, the inner tube 100 can be effectively pressed by the compressive force of the elastic body 341 in the inner diameter direction of the inner tube 100 and the insert 363, and the seal for preventing leakage of the outer tube side fluid can be strengthened. it can. In addition, if there is no insert 363 at a position where the inner tube 100 receives the compressive force of the elastic body 341, there is a concern that the inner tube 100 may be deformed for a long time, but the inner tube 100 is supported from the inside by the insert 363. By doing so, deformation can be suppressed. In FIG. 3, the outer tube 200 with the inner tube 100 inserted therein is mounted on the insert 333 of the outer tube mounting portion and is fixed by a cap nut 334. The outer tube mounting portion 330 to which the outer tube 200 is mounted is fixed by screwing the male screw portion 332 with the female screw portion (joining portion) 343 of the head portion main body 340. Inside the head portion main body 340, a flow path 344 of the outer pipe side fluid and a flow path branch 345 are formed, and a notch 346 in which the elastic body 341 is disposed is formed. The joining of the inner pipe mounting portion 360 to the existing pipe (not shown) is selected according to the shape of the existing pipe. A ferrule, a flange, or the like may be disposed using a fixture that penetrates the adapter 350.

Hereinafter, details of each part of the double-pipe heat exchanger 1 of the present embodiment will be described. As the inner tube 100 constituting the inner tube of the double tube, a flexible tube is used. The material may be appropriately selected according to the characteristics required for the inner pipe. A tube made of a synthetic resin is suitable, and the material is preferably a material having excellent flexibility such as a silicone resin, a urethane resin, or a polyvinyl chloride resin. When cleanliness (low elution) is required, such as when used in a pharmaceutical process, a tube made of a fluororesin or a silicone resin is suitable. Fluorine resins and silicone resins have not only clean properties but also heat resistance, can be used for high-temperature fluids, and can be treated with steam sterilization. In particular, a fluororesin is preferable because it is chemically stable and has low gas permeability and visibility.

As the outer tube 200 constituting the outer tube of the double tube, a flexible tube is used. The material may be appropriately selected according to the characteristics required for the outer tube. A tube containing a synthetic resin is suitable, and the material is preferably a flexible material such as a silicone resin, urethane resin, polyvinyl chloride, or fluorine resin. When cleanliness (low elution) is required, a tube made of fluororesin or silicone is suitable. Fluororesin and silicone have not only clean properties but also heat resistance, and high-temperature fluids such as heat transfer steam can also be used. When pressure resistance is required for the outer tube, it is possible to use a hose with a resin pressure-proof reinforcing braid layer in the middle of the tube wall, and the outer tube is subjected to bellows processing to improve flexibility. At the same time, it is possible to improve the heat flow by improving the turbulence of the fluid flow in the outer tube. It is also preferable to use a bellows-shaped metal tube excellent in pressure resistance and heat resistance.

The outer pipe mounting part 330 can be used by combining commercially available joints that can be easily obtained, and commercially available pipe joints, hose joints, caulking fittings, hose nipples, and the like can be selected. In this embodiment, a hose joint is used, and one having a male screw portion 331 that is screwed into a female screw portion 343 of the head portion main body 340 is selected for joining to the head portion main body 340. In addition to male / female screws of various standards, ferrules, pipe joints, pipe connections, and the like can be selected as the joint shape, and sealing by O-ring, screwing, welding, etc. is possible.

As shown in FIG. 3, the head portion main body 340 has a fluid flow path and a through hole for inserting the inner tube. The gap between the inner surface of the through hole and the surface of the inner tube 100 becomes a flow path for the outer tube side fluid. The fluid in the outer pipe 200 passes through the outer pipe mounting portion 330, passes through the flow path 344, passes through the flow path branch 345, and is discharged to an existing pipe (not shown) of the outer pipe side fluid. The through hole has a diameter that allows the inner pipe 100 to be inserted on the adapter 350 side from the flow path branch 345, and the outer pipe side fluid is arranged in a notch 346 formed on the side surface of the adapter 350 side of the head body 340. The sealed elastic body 341 is sealed so as not to leak to the adapter 350 side. The head body 340 and the adapter 350 are fixed by a fixing tool 352 such as a bolt. As a fixing method, other methods such as forming a male screw / female screw of each standard on the head main body 340 and the adapter 350 and fixing can be selected. The elastic body 341 is compressed by integrating the head main body 340 and the adapter 350 with the fixture 352, and the inner tube 100 is compressed in the radial direction while closely contacting the inner surface of the notch 346 and the adapter 350 surface. The side fluid is completely sealed. If the outer pipe side fluid leaks due to deterioration of the elastic body 341 due to long-term use, etc., the leaked fluid flows from between the head body 340 and the adapter 350 to the outside of the head section, or the adapter It flows from between 350 and the inner pipe connection part 360 to the outside of the head part. The material of the head part is preferably made of a metal such as stainless steel.

The adapter 350 is formed with a through hole extending from the head portion main body 340 and a joint portion 351 that joins the inner pipe connection portion. The through hole of the adapter has the same diameter as the through hole of the head unit body 340 on the adapter 350 side. The elastic body 341 disposed in the notch 346 of the head body 340 is pressed by the side surface of the adapter 350. Similarly to the notch 346 of the head portion main body 340, an elastic body can be provided by forming a notch on the circumference of the through hole on the side surface of the adapter 350 on the inner pipe connecting portion 360 side. By providing an elastic body in the adapter, the position where the fluid flows to the outside of the head unit when the outer pipe side fluid leaks can be limited between the head unit main body 340 and the adapter 350. A joint portion 351 that joins the inner pipe connection portion 360 of the adapter 350 has a function of fixing the inner pipe connection portion 360. For example, a recess having substantially the same diameter as that of the joint 351 can be provided and the joint can be fitted, and joining by various standard male / female screws, O-rings, welding, or the like is possible. The adapter itself can be integrated with the inner pipe connection portion 360, for example, by providing the function of the cap nut 361 of the inner pipe connection portion 360. The adapter 350 is preferably made of a metal such as stainless steel.

In the present embodiment, the inner pipe mounting portion 360 is a combination of commercially available joints that can be easily obtained. The connecting portion between the inner pipe 100 and the existing piping (not shown) is fixed by a bamboo shoot-shaped insert 363 and a cap nut 361 without requiring additional processing such as flare processing at the end of the inner pipe 100. The inner pipe side fluid is sealed so as not to leak to the outside by tightening the insert 363 and the cap nut inserted into the inner pipe. Further, the length of the insert 363 is set such that the inner tube 100 reaches a position where the elastic body 341 receives stress from the outer surface of the inner tube 100 in the inner diameter direction, so that the inner tube 100 formed by the cap nut 361 and the insert 363 is used. It is possible to enhance the sealing effect by sealing in two places: fastening of the elastic member 341, compression force of the elastic body 341, and pressing of the inner tube 100 by the insert 363. If leakage of the inner pipe side fluid occurs due to deterioration of the inner pipe 100 due to long-term use of the double pipe heat exchanger, the leaked fluid will flow between the adapter 350 and the inner pipe connection 360. From the outside of the head portion, the leakage can be confirmed visually from the outside of the head portion. Further, as described above, when an elastic body is arranged by forming a notch on the circumference of the through hole on the side surface of the inner pipe connection portion 360 of the adapter 350, when the outer pipe side fluid leaks, The position where the fluid leaks to the outside can be limited between the head body 340 and the adapter 350. Accordingly, it is possible to distinguish between leakage of the outer pipe side fluid and leakage of the inner pipe side fluid at a location where the fluid leaks to the outside of the head portion.

In the above-described embodiment, a connecting tool such as a commercially available joint is used in combination so that it can be configured more easily. An effect can be obtained. Of course, the present invention is not limited to the case where the double-pipe heat exchanger and the pipe body are connected, but may be a case where the double-tube heat exchanger is connected to a joint of an apparatus. The present invention is particularly useful in a double-pipe heat exchanger in which it is difficult to weld or weld a double-pipe tube and a connector.

The double-pipe heat exchanger of the present invention can be used in general applications of heat exchangers, but is particularly suitable as a heat exchanger used in pharmaceutical production, semiconductor-related production, etc. where contamination is a problem.

DESCRIPTION OF SYMBOLS 1 Double pipe type heat exchanger 100 Inner pipe, 200 Outer pipe, 300 Head part, 330 Outer pipe mounting part, 340 Head part main body, 341 Elastic body, 342 Fixing tool, 346 Notch, 350 Adapter, 360 Inner pipe mounting part

Claims (4)

A double tube heat exchanger comprising an outer tube, an inner tube, and a head portion, wherein the head portion comprises a main body, an adapter, an outer tube mounting portion, and an inner tube mounting portion, and the main body of the head portion is The outer tube mounting portion has a joint portion, a through hole serving as an outer tube-side fluid channel and an inner tube insertion channel, and an outer tube-side fluid channel branch, and the adapter extends from the main body. A through hole and a joint portion of the inner tube mounting portion, the inner tube mounting portion has an insert to be inserted into the inner tube, and a through hole circle is formed on the adapter side surface of the main body. A cutout for arranging the elastic body is formed on the circumference, and an elastic body made of a synthetic resin formed in a substantially ring shape is arranged in the cutout, and the main body and the adapter are integrated by a fixture. Then, the elastic body is compressed, and the inner tube is radially contacted with the inner surface of the notch and the adapter surface. Compressed, double-pipe heat exchanger, characterized in that a structure for pressing the inner tube and the insert of the elastic body and the inner tube mounting portion. 2. The double-pipe heat exchanger according to claim 1, wherein the outer tube is configured by a tubular body containing a synthetic resin. 2. The double tube heat exchanger according to claim 1, wherein the outer tube is formed of a bellows-shaped metal tube. 4. The double pipe heat exchanger according to claim 1, wherein the inner pipe is made of a fluororesin or a silicone resin.

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