WO2006090626A1

WO2006090626A1 - Multitubular heat exchanger

Info

Publication number: WO2006090626A1
Application number: PCT/JP2006/302690
Authority: WO
Inventors: Takuya Kurisu; Takashi Nakano
Original assignee: Izumi Food Machinery Co., Ltd.
Priority date: 2005-02-23
Filing date: 2006-02-16
Publication date: 2006-08-31
Also published as: TW200702623A; JP2006234232A

Abstract

A multitubular heat exchanger (100), comprising at least a can body (1), tube plates (2, 21), and heat exchanger tubes (3). The can body (1) forms an outer shell of hollow structure, and the tube plates (2, 21) are fitted to both end parts thereof. The heat exchanger tubes (3) are formed of multiple pieces of tubes, and installed so that one end part of each of the plurality of heat exchanger tubes is inserted into one of a plurality of opening parts (25) formed in at least one of the tube plates (2, 21). The insertion part of the heat exchanger tube (3) into the opening part (25) is characterized in that it is welded at both end two positions along the outer periphery of the heat exchange tube (3) to connect to the tube plates (2, 21) forming the opening part (25).

Description

Specification

Multi-tube heat exchanger

Technical field

The present invention relates to a multitubular heat exchanger that is suitably used for heat exchange of a fluid such as a gas (including a mixed gas) or a liquid (including a solution or a dispersion), particularly a liquid. More specifically, the present invention relates to a shell 'and' tube type heat exchanger that can exchange heat between beverages. Background art

Conventionally, a multi-tubular heat exchanger is known as an apparatus for efficiently performing heat exchange of fluids. This multi-tube heat exchanger ^^ has a structure in which a plurality of small-diameter heat transfer tubes called tubes are installed between two supports called tube plates in a large-diameter cylindrical can body called shell. For this reason, it is also called a shell 'and' tube heat exchanger.

[0003] In this multi-tube heat exchanger, a fluid to be heat-exchanged flows in the heat transfer tube, and a high-temperature or low-temperature heat medium or refrigerant (hereinafter simply referred to as a heat medium) flows in the can body. The heat exchange is performed indirectly between the fluid and the heat medium via the tube wall of the heat transfer tube. Such heat exchange is performed through a plurality of small-diameter heat transfer tubes. As a result, the contact area with the heat medium is increased and the exchange efficiency is extremely excellent. For this reason, this kind of multi-tube heat exchange has been used as a means for heating or cooling beverages even during heat treatment of beverages for the purpose of sterilization and the like.

[0004] However, when such a beverage is used as a fluid, it is difficult to sufficiently clean the inside of the can body, so that the inside of the can body can be used as a heat medium. In other words, it was necessary to use a fluid other than beverages as a heat transfer medium. For this reason, heat exchange cannot be performed between beverages, resulting in a loss of heat exchange, and the high tube heat exchanger and heat exchange efficiency cannot be fully utilized!

[0005] For the purpose of solving such problems, by reducing the gaps in the can body as much as possible and eliminating the problem of poor cleaning of such gaps, which becomes a hotbed for breeding of germs and the like. Various attempts have been made to provide hygienic multi-tube heat exchange. For example, as shown in FIG. 5, in the heat transfer tube 3 insertion portion of the tube plate 2, a groove is formed on both outer surface sides of the tube plate 2. Forming a structure (structure in which the opening diameter of the tube sheet increases toward the outside in the thickness direction of the tube sheet), and a multi-tube with a structure in which only one location is connected by welding 4 from the outside along the outer periphery of the heat transfer tube 3 Formula heat exchange has been proposed (Japanese Patent Laid-Open No. 09-133492 (Patent Document 1)).

[0006] Depending on this structure, the adoption of the groove structure may not have the force to reduce the minimum gap, but the groove structure on the side not connected by welding may still be poorly cleaned. However, since this groove structure inevitably has a large opening diameter as the thickness of the tube plate increases, the insertion distance (pitch) between the heat transfer tubes must be increased, resulting in a unit surface of the tube plate. The number of heat transfer tubes that occupy the product decreases, resulting in an inefficient device shape, and it is difficult to make the entire device compact. Furthermore, there is a disadvantage that welding distortion increases as the welding amount and welding heat input increase.

Patent Document 1: Japanese Patent Laid-Open No. 09-133492

Disclosure of the invention

Problems to be solved by the invention

[0007] The present invention has been made in view of the current situation as described above, and an object of the present invention is to reduce the voids in the can body as much as possible, and thus to have excellent cleanability in the can body. Therefore, it is to provide a multi-tubular heat exchange that satisfies the hygienic requirements and enables off-compassion.

Means for solving the problem

[0008] The present invention is a multi-tubular heat exchanger comprising at least a can body, a tube plate, and a heat transfer tube, the can body being an outer cover of a hollow structure, Each of the tube plates is attached to both ends, and there are a plurality of the heat transfer tubes, each of which has an opening formed in at least one tube plate. The insertion portion of the heat transfer tube into the opening is a tube in which the two ends of the insertion portion respectively constitute the opening along the outer periphery of the heat transfer tube. It is characterized by being connected to the plate by welding.

[0009] Here, there are a plurality of the heat transfer tubes, and both end portions thereof are installed by being inserted into one of the openings formed in the tube plate, and the heat transfer tubes As for the insertion part of the above-mentioned opening, the two ends of the insertion part are respectively along the outer circumference of the heat transfer tube. It is preferable to be connected to the tube plate that constitutes the opening by welding.

[0010] Further, it is preferable that the insertion portion of the heat transfer tube into the opening is welded at one of the two ends of the insertion portion from the inside of the heat transfer tube. Further, the opening is formed with a protrusion at the peripheral edge on the side where the heat transfer tube is installed, and is welded to the protrusion from the inside of the heat transfer tube along the outer periphery of the heat transfer tube. It can be a life.

[0011] In addition, in the insertion portion of the heat transfer tube into the opening, the tube wall of the heat transfer tube, the inner wall surface of the tube plate constituting the opening, and two welded portions at both ends of the insertion portion. It is preferable that a void is formed by the above, and a hole communicating with the outside is formed in the void. This hole can be communicated with the outside so as to communicate with a plurality of the gaps, and can be opened to a space formed between the can body and the tube sheet so as to communicate with the plurality of the gaps. It is possible to communicate with the outside through the space through a detection hole formed in the can body.

[0012] Further, the heat transfer tube may be expanded beyond the insertion portion of the heat transfer tube into the opening. Further, in the multi-tube heat exchanger according to the present invention, the beverage flows through both the inside of the can body and the inside of the heat transfer tube, so that heat can be exchanged between the beverages. Monkey.

[0013] In addition, the method for connecting the tube plate and the heat transfer tube of the present invention includes a step of inserting the heat transfer tube into the opening of the tube plate, and two ends of the insertion portion of the heat transfer tube into the opening. And a step of connecting the tube plate constituting the opening by welding along the outer periphery of the heat transfer tube.

The invention's effect

[0014] The multitubular heat exchanger of the present invention has a configuration as described above, thereby reducing the voids in the can body as much as possible, and thus being excellent in cleanability in the can body. Satisfying the requirements and enabling compactness.

Brief Description of Drawings

FIG. 1 is a schematic cross-sectional view of a multitubular heat exchanger according to the present invention.

FIG. 2 is a schematic cross-sectional view showing, in an enlarged manner, an insertion portion of a heat transfer tube into a tube plate opening. FIG. 3 is a schematic cross-sectional view showing a further enlarged portion of the heat transfer tube inserted into the tube plate opening. FIG. 4 is a schematic cross-sectional view taken along line IV-IV in FIG.

FIG. 5 is a schematic cross-sectional view showing, in an enlarged manner, an insertion portion of a conventional multi-tube heat exchanger into a tube plate opening of a heat transfer tube.

Explanation of symbols

[0016] 1 can body, 10 inner wall, 15 nozzle, 2, 21 tube plate, 25 opening, 26 protrusion, 27 first groove, 28 second groove, 29 inner wall, 3 heat transfer tube, 31 tube wall, 4 Welding, 41 welds, 45 gaps, 46 holes, 47 detection holes, 48 recesses, 49 spaces, 5 joints, 55 O-rings, 10 0 Multi-tube heat exchanger.

BEST MODE FOR CARRYING OUT THE INVENTION

[0017] Hereinafter, the present invention will be described in more detail. In the following description of the embodiments, the force described with reference to the drawings The same reference numerals in the drawings of the present application indicate the same or corresponding parts.

[0018] <Multi-tube heat exchanger>

A schematic cross-sectional view of the multi-tube heat exchanger of the present invention is shown in FIG. As shown in FIG. 1, a multi-tube heat exchanger 100 of the present invention basically includes a can body 1, tube sheets 2 and 21, and a heat transfer tube 3.

[0019] Here, the can body 1 serves as a hollow outer cover, and the tube plates 2 and 21 are attached to both ends thereof. The two tube plates 2 and 21 are attached so as to face each other in the case where there is no bent portion in the longitudinal direction of the can body 1. In addition, there are a plurality of the heat transfer tubes 3, and both end portions of the heat transfer tubes 3 are respectively formed on the tube plates 2 and 21, and are installed by being inserted into one of the openings 25. .

[0020] The multi-tube heat exchanger 100 of the present invention has such a basic configuration, so that fluids having different temperatures flow in the can body 1 and the heat transfer tube 3, so that the tubes of the heat transfer tube 3 can flow. Heat is exchanged between these fluids indirectly through the wall 31.

[0021] It should be noted that, here, a description will be given of an example in which both end portions of each heat transfer tube are inserted into openings formed in a plurality of both tube plates, but this is the only aspect of the present invention. Limited to Instead, only one end of one of the heat transfer tubes is inserted into the opening of one of the two tube plates, and the other end is inserted into the other tube plate. It is also included that the connection is made by different connection methods. Even in such an embodiment, the above-described effects of the present invention are exhibited.

[0022] Ku-can body>

The can body 1 is also referred to as a shell and serves as a shell of a hollow structure and serves as a main body of a multi-tube heat exchanger. Usually, it has a cylindrical shape with an outer diameter of 30 mm to 700 mm and a length of 2 m to 6 m. However, the cross-sectional shape is not limited to the circular shape in this way, it can be a polygonal shape such as a quadrangle or a hexagon, or an elliptical shape. Not limited.

[0023] Such a can body 1 has two tube plates 2 and 21 to be described later attached to both ends thereof, and a plurality of heat transfer tubes 3 are supported. The material of the can body 1 is not particularly limited, but is preferably stainless steel.

In the can body 1, a nozzle 15 is usually formed, and a structure is provided in which fluid can be supplied into the can body 1 or fluid can be discharged from the can body 1. For example, as shown in FIG. 1, two such nozzles 15 may be formed in the vicinity of both ends of the can body 1, one in each case. That is, of the two nozzles, the fluid is supplied into the can body 1 by one of the nozzles and the nozzle, and the fluid is discharged by the other nozzle.

[0025] It is preferable that each of such nozzles be disposed near both ends of the can body 1 and particularly close to the tube sheets 2 and 21. The force with which the tube plates 2 and 21 are arranged further to the end side than the position where each nozzle is arranged in the longitudinal direction of the can body The space having a certain distance between each nozzle and these tube plates This is because the fluid flowing in the can body will stagnate in that part.

[0026] Further, the can body 1 may be of an integral structure integrated with itself. For example, as shown in Fig. 1, a portion including one of the nozzles is divided into short tubes. It is also possible to make such a divided structure. In this way, by dividing the portion including one of the nozzles into short tubes, the tube sheet can be easily observed and cleaned, and dirt and defects can be effectively prevented. The target power is also favorable. [0027] It should be noted that the part that is divided into the short tubes includes one of the nozzles as described above. If the joint 5 is formed between one of the nozzles and the tube plate, the can is accompanied by the formation of the joint 5. This is because an unnecessary space is created in the body, and the fluid in the can body is prevented from standing in this space.

[0028] On the other hand, a joint portion having a triangular groove having a ferrule structure is used for the joint portion 5 between the portion divided into a short tube and the can body as described above, and an O-ring 55 is used as a packing for the joint portion. It is preferable to use (ring-shaped sealing material made of an elastic body such as synthetic rubber).

[0029] <Tube sheet>

Since the tube sheet of the present invention is attached to both ends of the can body 1, at least two tube sheets are arranged. That is, as shown in FIG. 1, two tube sheets 2 and 21 are attached to both ends of the can body 1, respectively. This attachment method is not particularly limited. For example, it can be fixedly attached by the joint portion 5 like the tube plate 2 shown in FIG. 1, or can be attached in a movable state like the tube plate 21. . Usually, a tube plate that is fixedly attached is called a fixed tube plate, and a tube plate that is attached in a movable state is called an idle tube plate. The two tube plates 2 and 21 may be fixed tube plates, or one of them may be a floating tube plate. When the fixed tube plate is used, it can be integrated with the can body 1 by welding or the like, in addition to being fixed in a removable state by the joint 5 shown in FIG. However, in consideration of the cleaning properties in the can body 1, it is preferable to fix it in a removable state. In this regard, it is preferable to adopt a ferrule structure for the joint 5 as in the joint 5 of the can body 1.

[0030] The floating tube plate (tube plate 21) includes, for example, a first groove portion 27 and a second groove portion 28 along the outer periphery of each end portion in the thickness direction of the tube plate. By inserting the O-ring 55 into each of the second groove portions 28, the O-ring 55 can be moved in any direction while in contact with the inner wall 10 in the can body 1.

[0031] Such tube plates 2 and 21 have a plurality of openings 25, so that the heat transfer tubes 3 can be installed (supported) by inserting the heat transfer tubes 3 described later into the openings 25. It is what you have. In the case of such a fixed tube plate, the outer shape of the tube plates 2 and 21 is substantially the same as the outer shape of the can body 1, and has a thickness of 20 to 100 mm. Also, the floating tube plate In this case, the outer diameter is almost the same as the inner diameter of the can body 1 (about 30 to 700mm), and its thickness is 20mn! ~ 100mm shape. The material of the tube plates 2 and 21 is not particularly limited, but is preferably stainless steel.

[0032] <Heat transfer tube>

The heat transfer tube 3 is also called a tube, and a plurality of the heat transfer tubes 3 exist in the can body 1. The number is more preferably 4 to 120.

[0033] The heat transfer tube 3 has a cylindrical shape with an outer diameter of 10 mm to 40 mm, and the length thereof is substantially the same as the length of the can body 1. In addition, the cross-sectional shape is not limited to a circular one, but can be a polygonal shape such as a rectangle or a hexagon, or an elliptical shape. Not limited. However, since the heat transfer tube 3 is inserted into the opening 25 of the tube plates 2 and 21, the cross-sectional shape thereof must match the shape of the opening, and the shape of the opening is usually easy to process. Since the heat transfer tube 3 has a circular shape, the cross-sectional shape of the heat transfer tube 3 is also preferably circular. The material of the heat transfer tube 3 is not particularly limited, but is preferably stainless steel.

[0034] Such a heat transfer tube 3 has a plurality of forces as described above. Each end of each of the heat transfer tubes 3 is formed in one of the openings 25 formed in the two tube sheets 2 and 21 respectively. It is installed (supported) by being inserted.

[0035] <Connection between tube plate (opening) and heat transfer tube>

As described above, the heat transfer tube 3 of the present invention is installed by inserting both end portions into one of the opening portions 25 formed in the two tube sheets 2 and 21. And the insertion part to the opening part 25 of the heat exchanger tube 3 is connected to the tube sheet which comprises an opening part along the outer periphery of the heat exchanger tube by welding 4 at the both ends of the insertion part. Hereinafter, this connection will be described in more detail with reference to FIG. 2 and FIG.

FIG. 2 is an enlarged schematic cross-sectional view showing a portion where the heat transfer tube 3 is inserted into the opening 25 of the tube plate 2, and FIG. 3 is an enlarged schematic cross-sectional view thereof. In the insertion portion, the tube wall 31 of the heat transfer tube 3 is opposed to the inner wall surface 29 of the tube plate constituting the opening 25, and two ends of the insertion portion (indicated by arrows A and B in FIG. 3). Are connected to the tube plate 2 forming the opening along the outer circumference of the heat transfer tube 3 by welding 4. Thus both ends 2 Since the locations (arrows A and B) are connected by welding, the gap between the fluid flowing in the can body 1 and the fluid flowing in the heat transfer tube 3 (the gap generated between the tube plate 2 and the heat transfer tube 3) Intrusion can be prevented very effectively. In other words, the weld 4 on the arrow A side prevents the intrusion of the fluid that flows in the heat transfer tube 3, and the weld 4 on the arrow B side exhibits the effect for preventing the intrusion of the fluid flowing in the can body 1. .

[0037] Here, as the welding method, any conventionally known welding method can be employed. Examples include gas welding, arc welding, electrical resistance welding, and electron beam welding. Further, in the welding, it is preferable that the metal constituting the tube plates 2 and 21 and the metal constituting the heat transfer tube 3 are integrally integrated at the welded portion 41. If desired, a third metal such as a welding rod can be used. Further, on the tube sheet 2 and 21 side in this welded portion, it is possible to improve the welding strength by adopting chamfering or a groove structure as necessary. However, this chamfering and groove structure does not need to be large as in the prior art, so the distance (pitch) between the heat transfer tubes is not increased, which contributes to the compactness of the entire apparatus. Furthermore, if the welding distortion increases without increasing the welding amount and welding heat input, V, inconvenience can be prevented.

[0038] The welding range of the welded portion 41 is not particularly limited as long as it is appropriately selected according to the outer diameter of the heat transfer tube 3, the thickness of the tube wall 31 of the heat transfer tube, the thickness of the tube plate, and the like. However, in terms of the distance in the length direction of the heat transfer tube, it can be in the range of 0.5 to 5. Omm, more preferably 0.7 to 3. Omm.

[0039] Further, U and a welding method that is more preferable include a method in which any one of the two ends (arrows A and B) of the insertion portion is welded from the inside of the heat transfer tube. In particular, it is preferable that the end portion on the side where the heat transfer tube 3 is installed (the arrow B side in FIG. 3) is welded from the inside of the heat transfer tube 3. This is because the side on which the heat transfer tube 3 is installed is the inner side of the can body 1 and it becomes difficult to weld from the outside.

[0040] In this case, a protrusion 26 is formed in the opening 25 at the peripheral edge on the side where the heat transfer tube 3 is installed, and the inner force of the heat transfer tube 3 at the protrusion 26 is the outer periphery of the heat transfer tube 3. It is particularly preferred to weld along. It is also a force that can weld the metal of the tube plate 2 and the metal of the heat transfer tube 3 so as to be united with a small amount of heat. That is, the above heat transfer Inserting the welding head into the tube 3 also with the arrow A side force in Fig. 3 and applying the welding torch from the inside of the heat transfer tube 3 on the arrow B side, the projection 26 and the heat transfer tube 3 are substantially completely separated. It can be welded and joined together.

[0041] Here, as the shape of the protrusion 26, the height h is preferably 2 mm to 10 mm, more preferably 4 mm to 6 mm, and the wall thickness t is 0.3 mn! It is preferable to set to ~ 3 mm, more preferably 0.5 mm ~: Lmm.

[0042] As is clear from the above force, the method of connecting the tube sheet and the heat transfer tube of the present invention includes a step of inserting the heat transfer tube into the opening of the tube plate, and a portion of the heat transfer tube inserted into the opening. Steps for connecting the two ends of the tube along the outer periphery of the heat transfer tube and the tube sheet constituting the opening by welding. As a method for connecting the tube plate and the heat transfer tube, a tube expansion (settling) method can be adopted in addition to the above-described welding. That is, it is preferable that the heat transfer tube is expanded at a portion where the heat transfer tube is inserted into the opening. As a result, the connection strength between the tube plate and the heat transfer tube can be further improved, and the gap can be reduced.

Furthermore, in this case, as shown in FIG. 3, one or more recesses 48 are formed on the inner wall surface 29 of the tube plate 2, whereby the connection by the above-mentioned tube expansion can be made stronger. It is thought that the force is not because a part of the tube wall 31 of the heat transfer tube 3 is likely to enter the recess 48 by expansion.

[0044] <Cavity, hole, detection hole>

In the present invention, as described above, the gap (particularly between the tube plate and the heat transfer tube) generated in the can body 1 by welding the two ends of the insertion portion at the insertion portion of the heat transfer tube into the opening of the tube sheet. The force that reduces as much as possible the air gap generated between the tube wall 31 of the heat transfer tube, the inner wall surface 29 of the tube plate 2 that forms the opening 25, and the insertion portion The gap 45 is formed by the welded portion 41 at the two ends (arrows A and B), and the hole 46 leading to the outside is formed in the gap 45, so that the following effects can be exhibited.

That is, by forming a hole 46 that communicates with the outside as shown in FIGS. 3 and 4 in the gap 45, fluid leakage (intrusion) can be detected through the hole 46. Any of the fluids that flow in the heat transfer tube 3 that flows in the can body 1 when the weld 4 breaks It can be expected to be discovered immediately even if it enters the gap 45 of the force. Therefore, when the tube plate is the floating tube plate (tube plate 21) shown in FIG. 1 (that is, when the can body 1 is arranged on the outer periphery of the tube plate 21), the hole 46 is as shown in FIG. A space 49 formed between the can body 1 and the tube plate 21 so as to communicate with the plurality of gap portions 45 (that is, the O-ring 55 inserted in the first groove portion 27 in FIG. 1 and the second groove portion 28). Is opened to the space 49) surrounded by the O-ring 55, the tube plate 21, and the can body 1 inserted through the space 49, and the outside is connected to the outside by the detection hole 47 formed in the can body 1 through the space 49. It is preferable to let it pass. On the other hand, when the tube plate is the fixed tube plate (tube plate 2) shown in FIG. 1 (that is, when the can body 1 is not disposed as an outer cover on the outer periphery of the tube plate 2), the hole 46 has a plurality of the gaps. It is preferable to communicate only with the portion 45 so that it communicates with the outside (in this case, the hole on the outermost surface portion of the tube plate exhibits the same action as the detection hole 47) (this mode is shown in FIG. 4). In addition, there is no can body 1 and corresponds to the embodiment.

) o

[0046] Further, due to the action of the gap 45 and the hole 46, mixing of the fluid flowing in the can body 1 and the fluid flowing in the heat transfer tube 3 can be extremely effectively prevented. The fluid pressure of the fluid flowing in the can body 1 and the fluid pressure of the fluid flowing in the heat transfer tube 3 are also powerful, and the force is high (higher than atmospheric pressure). Since the pressure is equal to the atmospheric pressure, the fluid that has entered the gap 45 passes through the gap 45 and the hole 46 without mixing with the other fluid (without flowing toward the other fluid). As a result, both fluids are prevented from being mixed.

[0047] It should be noted that the hole 46 is shown in FIG. 1 and FIG. 4 so as to finally communicate with the outside in two places. The hole 46 is not limited to such a mode. It is also possible to communicate with the outside or at three or more locations.

[0048] <Heat exchange method>

As described above, the multitubular heat exchanger 100 of the present invention indirectly flows through the pipe wall 31 of the heat transfer tube 3 by flowing fluids having different temperatures through the can body 1 and the heat transfer tube 3. In addition, heat is exchanged between these fluids. In this case, the direction of the fluid flowing in the can body 1 and the direction of the fluid flowing in the heat transfer tube 3 are preferably opposed to each other, but are made parallel. [0049] In particular, the multitubular heat exchanger 100 of the present invention has the configuration as described above, so that a beverage is allowed to flow as a fluid both in the can body 1 and in the heat transfer tube 3. It is now possible to exchange heat between these beverages. For this reason, both the heating operation and the cooling operation are performed in comparison with the conventional case where a fluid other than a beverage serving as a heat medium flows through the can body 1 and the beverage subject to heat exchange flows only through the heat transfer tube. In the normal processing process for beverages containing it, the heat energy loss of the entire process has been dramatically reduced.

[0050] Also, by using a combination of a plurality of multi-tube heat exchangers lOO according to the present invention, the beverage that flows in the heat transfer tube 3 and the beverage that flows in the can body 1 have an effective heat energy. If a plant that can be used is constructed, the plant itself can be made compact, and its industrial utility can be dramatically improved in applications such as heat sterilization of beverages. Of course, it is also possible to flow a heat medium other than beverage in the can body 1 as in the past, and this can be combined with the one that flows the beverage using the heat medium in the can body 1 as described above. It ’s all about building.

[0051] The reason why the beverage can flow not only in the heat transfer tube 3 but also in the can body 1 is that the multi-tube heat exchanger lOO of the present invention has the above-described configuration. In addition, the gaps in the can body 1 are reduced as much as possible to obtain excellent cleaning properties.

[0052] Beverages (including liquid foods) that are heat-exchanged using the multitubular heat exchanger 100 of the present invention can be applied to a wide range of beverages that are not particularly limited. For example, milk, dairy drinks, fruit juice drinks, coffee, tea, green tea, carbonated drinks, alcohol, mineral water, energy drinks, dashi, sauce, koji soup, or formulating or extracting used in the manufacturing process of these drinks Water for use can be mentioned.

[0053] It should be noted that the fluid exchanged using the multi-tubular heat exchanger 100 of the present invention is not limited to drinks as described above, but various liquid medicines (such as eye drops) and various chemical products. Etc. liquids are included. In addition, the fluid includes a gas that is not limited to a liquid.

[0054] <Others> As long as the multi-tube heat exchanger 100 of the present invention includes the can body 1, the tube plates 2 and 21, and the heat transfer tube 3 as described above, an arbitrary configuration other than these can be added. Can do. For example, the heat transfer tube 3 may be further supported by an auxiliary support material or the like. A multi-stage heat exchange system can also be constructed by connecting to a plurality of multi-tube heat exchangers via the nozzle 15 and the tube plates 2 and 21 and the like.

[0055] As described above, the multitubular heat exchanger 100 of the present invention can be used in combination with a plurality of multitubular heat exchangers 100 of the present invention, as well as a heating device, a cooling device, or a heating medium supply device. It is possible to use a refrigerant supply device or a combination of these with a pump.

[0056] The multi-tube heat exchanger lOO of the present invention can naturally be used in combination with other pipes. For example, the fluid flowing through the heat transfer tube 3 can be supplied or discharged by connecting a pipe having the same inner diameter as the can body 1 to the tube plates 2 and 21 side. Further, by connecting a pipe having the same inner diameter as the nozzle 15 to the nozzle 15, the fluid flowing in the can body 1 can be supplied or discharged.

Although the embodiments of the present invention have been described as described above, it is also planned from the beginning to appropriately combine the configurations of the above-described embodiments.

[0058] The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

Claims

The scope of the claims

[1] A multi-tube heat exchange (100) comprising at least a can body (1), a tube plate (2, 21), and a heat transfer tube (3),

The can body (1) is a hollow outer cover, and the tube plates (2, 21) are attached to both ends thereof,

There are a plurality of the heat transfer tubes (3), and any one end of each of the heat transfer tubes (3) is formed on at least one tube plate (2, 21). It is installed by being inserted into

The insertion portion of the heat transfer tube (3) into the opening (25) is a tube plate in which two ends of the insertion portion respectively constitute the opening (25) along the outer periphery of the heat transfer tube (3). Multi-tubular heat exchange (100), characterized by being connected to (2, 21) by welding.

[2] A plurality of the heat transfer tubes (3) are present, and both end portions thereof are inserted into the openings (25) formed in the tube plate (2, 21). The insertion portion of the heat transfer tube (3) into the opening (25) has two openings at both ends of the insertion portion along the outer periphery of the heat transfer tube (3). The multi-tubular heat exchanger (100) according to claim 1, wherein the heat exchanger (100) is connected to the tube plate (2, 21) constituting the steel plate by welding.

[3] The insertion portion of the heat transfer tube (3) into the opening (25) is welded at either one of the two ends of the insertion portion from the inside of the heat transfer tube (3). The multi-tubular heat exchanger (100) according to claim 1, characterized in that:

[4] The opening (25) is formed with a protrusion (26) at the peripheral edge on the side where the heat transfer tube (3) is installed, and the protrusion (26) The multi-tube heat exchanger (100) according to claim 1, wherein the heat exchanger tube (3) is welded from the inside of the heat transfer tube (3) along the outer periphery of the heat transfer tube (3).

[5] The tube wall (31) of the heat transfer tube (3) and the tube constituting the opening (25) at the insertion portion of the heat transfer tube (3) into the opening (25) A gap (45) is formed by the inner wall surface (29) of the plate (2, 21) and the two welds (41) at both ends of the insertion portion, and the gap (45) is formed outside. The multi-tubular heat exchanger (100) according to claim 1, wherein a hole (46) is formed.

6. The multi-tube heat exchanger (100) according to claim 5, wherein the hole (46) communicates with the outside so as to communicate with the plurality of gaps (45).

[7] The hole (46) communicates the plurality of gaps (45) with the can body (1) and the tube sheet.

To the space (49) created between (2, 21) and the outside through the space (49) through the detection hole (47) formed in the can body (1). The multitubular heat exchanger (100) according to claim 5, characterized in that it is characterized in that

[8] The heat transfer tube (3) according to claim 1, wherein the heat transfer tube (3) is expanded at a portion where the heat transfer tube (3) is inserted into the opening (25). Multi-tube heat exchange (100).

[9] The multi-tube type according to claim 1, wherein heat is exchanged between the beverages by flowing the material both in the can body (1) and in the heat transfer tube (3). Heat exchange (100).

[10] A method of connecting the tube plate (2, 21) and the heat transfer tube (3),

Inserting the heat transfer tube (3) into the opening (25) of the tube plate (2, 21); and two ends of the insertion portion of the heat transfer tube (3) into the opening (25). Heat transfer tube

Connecting the tube sheet (2, 21) constituting the opening (25) along the outer periphery of (3) by welding;

A method of connecting the tube sheet (2, 21) and the heat transfer tube (3), characterized by comprising: