JP2015021708A - Multitubular heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchanger suitable in production of food products such as food stuff and drinking water, and pharmaceuticals, and easy to maintain.SOLUTION: A multitubular heat exchanger is configured from a heat transfer tube bundle comprising a plurality of heat transfer tubes, a fixing tube plate for fixing the bundle, a tube plate arranged on the other end of the fixing tube plate of the heat transfer tube bundle, a body for housing a member, and a lid body. In the multitubular heat exchanger, the tube plate arranged on the other end of the fixing tube plate of the heat transfer tube bundle is formed so as to be fitted into the body, and the tube plate arranged on the other end of the fixing tube plate is formed so as to be freely move in the longitudinal direction of the heat transfer tube.

Description

  The present invention relates to a multitubular heat exchanger, and particularly relates to a heat exchanger having a structure that is easy to maintain and having an excellent heat exchange rate.

  Heat exchangers are used in a variety of industries, and various types of heat exchangers are known. Among these, the multi-tube heat exchanger is used in various industries because of its excellent heat transfer efficiency.

  Among them, in the heat exchanger used in the food industry and the medical field, since hygiene is particularly important, a high level is required in terms of material and structure.

  In terms of the above-described materials, for example, a structure in which stainless steel is lined on the inner surface of copper is known (see, for example, Patent Document 1). However, depending on the deformation behavior due to the difference in thermal expansion between the lined stainless steel and copper and the type of fluid flowing on the inner surface of the stainless steel, the stainless steel may be corroded or damaged, leaving room for improvement.

  In addition, when the lining material is torn or cracked due to thermal expansion or contraction, there is a possibility that impurities may be mixed into the food or medicine flowing inside the heat transfer tube, leaving room for investigation.

  Further, both ends of a plurality of heat transfer tubes used in these multi-tube heat exchangers are generally fixed to the main body with flanges. In such a structure, expansion due to heat is performed. There is a case where the heat transfer tube itself undergoes thermal deformation due to the shrinkage and shortens the life of the heat exchanger, and improvement is demanded (for example, see Patent Document 2).

  Thus, for heat exchangers used in the fields of food and medicine, there is a need for heat exchangers that are easy to maintain while maintaining high quality.

JP 2008-157544 A JP 2002-013898 A

  An object of the present invention is to provide a heat exchanger that is suitable for manufacturing foods such as foods or drinking water, and pharmaceuticals, and that is easy to maintain.

  In view of this situation, when the above-mentioned problems were intensively studied, the entire heat exchanger was made of titanium, and the heat exchanger was constituted by a plurality of heat transfer tubes, and one end of the plurality of heat transfer tubes was fixed to a fixed plate. It is possible to effectively absorb the expansion and contraction of the heat transfer tube due to temperature fluctuation during operation, and as a result, the life of the heat transfer tube can be greatly improved. As a result, the present invention has been completed.

  That is, in the multi-tube heat exchanger according to the present invention, the heat exchanger has a heat transfer tube bundle composed of a plurality of heat transfer tubes, a fixed tube plate for fixing the heat transfer tube bundle, and the other end of the fixed tube plate of the heat transfer tube bundle. It is composed of an arranged tube plate, and a main body and a lid for housing the member, so that the tube plate arranged at the other end of the fixed tube plate of the heat transfer tube bundle can be fitted inside the main body. The heat exchanger is configured such that a tube plate disposed at the other end of the fixed tube plate is configured to be movable in the longitudinal direction of the heat transfer tube.

  Further, in the multi-tube heat exchanger according to the present invention, it is preferable that a seal member is disposed on the outer peripheral portion of the tube plate disposed on the other end of the fixed tube plate of the heat transfer tube bundle. It is.

  Furthermore, in the multi-tube heat exchanger according to the present invention, it is preferable that a portion of the main body for fitting the tube plate disposed at the other end of the fixed tube plate of the heat transfer tube bundle is formed by cutting. It is what.

  Moreover, in the multitubular heat exchanger according to the present invention, it is preferable that an uneven surface constituted by a part of a spherical surface is formed on the surface of the heat transfer tube.

  Furthermore, in the multitubular heat exchanger according to the present invention, it is preferable that a plurality of the multitubular heat exchangers are connected.

  By following the present invention, even when the fluctuation range of the temperature condition of the heat exchange is large, that is, even when a large amount of stress is repeatedly applied to the heat transfer tube, the main body, and the connection part, the heat exchange has a sufficient life. The effect is that a vessel can be provided.

  Furthermore, by configuring the heat exchanger with titanium metal, it is possible to perform heat exchange without causing contamination even in the field of food and medicine that require strict standards in terms of hygiene. It is what you play.

It is sectional drawing which shows the multitubular heat exchanger which concerns on one Embodiment of this invention. It is an enlarged view of a heat exchanger tube.

The best embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 shows a preferred apparatus configuration of a multi-tube heat exchanger M according to the present invention.
A multi-tube heat exchanger M according to the present invention includes a plurality of heat transfer tubes 4 arranged in parallel (hereinafter, sometimes referred to as “heat transfer tube bundle”), a cylindrical main body 1 containing these, and a main body. 1 is comprised from the cover bodies 2a and 2b arrange | positioned at the both ends. The lid bodies 2a and 2b are provided with an inlet nozzle 5a and an outlet nozzle 5b, respectively. An inlet nozzle 3a for supplying a heat medium to the heat exchanger and an outlet nozzle 3b for discharging are disposed on the side body of the main body 1.

  In FIG. 1, potable water is cited as an example of the fluid to be heat exchanged. The drinking water flows from the nozzle 5a provided on the lid 2a from the right side of the paper, and then flows through the heat transfer tube bundle 4 and is discharged from the nozzle 5b provided on the lid 2b provided on the left end of the paper. Has been. On the other hand, a heat medium flows in from a nozzle 3 a provided in the main body 1, circulates outside the heat transfer tube bundle 4 in the main body 1, and is discharged from the nozzle 3 b.

  While a fluid such as drinking water passes through the heat transfer pipe 4 from the right side to the left side of the paper as described above, the drinking water is heated to a predetermined temperature by receiving heat from the heat medium flowing around the heat transfer pipe 4. The effect that it can be done is produced.

  For example, the dairy product such as milk can be passed through the heat transfer tube 4 as the drinking water and subjected to high-temperature treatment, whereby the dairy product can be sterilized.

  The heat transfer tubes 4 constituting the heat exchanger M according to the present invention are welded by penetrating the end portions of the heat transfer tube bundles 4 through the fixed flanges 6 (“fixed tube plate” in the claims). Are fixedly bound to the main body 1.

  On the other hand, the other end side of the heat transfer tube bundle 4 can be structured to be bound by the fixing plate 7 by passing through the fixing plate 7 (“tube plate” in the claims). With such a structure, there is an effect that the fixing plate 7 and the heat transfer tube bundle 4 can be integrally formed.

  In the present invention, it is preferable that the O-ring 8 be arranged on the surface layer portion of the fixing plate 7 described above. With the structure as described above, there is an effect that a seal portion can be formed between the heat transfer tube bundle 4 and the main body 1.

  Separation of the drinking water that circulates through the heat transfer tube 4 and the heat medium that circulates outside the heat transfer tube 4 in the main body 1 can be further ensured through the above-described seal portion. There is an effect that the contact with the medium can be effectively suppressed.

  In FIG. 1, as an example of an O-ring installation method, two rows of grooves are formed on the surface of the fixing plate 7, and two rows of O-rings 8 are passed therethrough, but the present invention is not limited to this mode.

  A commercially available O-ring constituting the above-described seal can be used, and a Teflon (registered trademark) type can be used as the material.

  In the present invention, the heat transfer tube bundle 4 is fixed to the fixed plate 7, but the fixed plate 7 is slidable on the inner wall of the main body 1 through the O-ring. It is not integrated with the main body 1. Thereby, it is comprised so that the heat exchanger tube bundle 4 may take the fitting structure which can be attached or detached with respect to the main body 1. FIG. Therefore, by removing the lids 2a and 2b shown in FIG. 1 from the main body 1 and then pulling out the heat transfer tube bundle 4 from the main body 1, the heat transfer tube bundle 4 can be taken out into the atmosphere. Is.

  Thus, there is an effect that the solid matter attached to the surface of the heat transfer tube bundle 4 taken out into the atmosphere can be easily cleaned.

  Moreover, since the heat transfer tube bundle 4 according to the present invention is arranged in a straight line, there is an effect that the cleaning inside the heat transfer tube can be efficiently advanced.

  Further, in the present invention, the heat transfer tube plate 4 is fixed to the main body 1 by welding or the like on the fixed flange 6 side, but on the fixed plate 7 side, it is sealed with respect to the main body 1 via the O-ring 8. It is possible to move while maintaining. Therefore, even when heating / cooling is repeated with respect to the heat transfer tube bundle 4, the stress applied to each part can be relaxed, and there is an effect that deformation and breakage can be prevented.

  FIG. 2 shows an enlarged view of the heat transfer tube 4 used in the present invention. As shown in FIG. 2, the heat transfer tube 4 is preferably a tube having a corrugated surface 4a when viewed from the side. Specifically, the heat transfer tube 4 has a diameter-enlarged portion 4c formed of a part of a spherical surface, and an expanded portion. It is preferable to configure like a rosary sphere in which cylindrical reduced diameter portions 4b that connect the diameter portions 4c are alternately connected.

  By forming in the shape as described above, it is possible to increase the heat transfer area and to efficiently exchange heat.

  Further, in the present invention, it is preferable that the vicinity of the portion where the heat transfer tube bundle 4 is fitted to the main body 1 of the heat exchanger M is constituted by a so-called one-piece by cutting out so as not to have a welding structure.

  As used herein, “near the part to be fitted” means near the part where the O-ring 8 contacts the main body 1. That is, when the assembly of the fixing plate 7 and the O-ring 8 is fitted to the main body 1 of the heat exchanger M, if the nozzle 3a and the main body 1 have a welded structure, the inner surface of the main body 1 is uneven. However, there is a possibility that the seal structure of the O-ring 8 is incomplete. On the other hand, if the nozzle 3a and the main body 1 are formed by cutting one piece instead of a welded structure, the corresponding inner surface of the main body 1 at the position where the nozzle 3a is located is kept smooth, and the seal structure is in a complete state. Can be maintained. In this case, the entire main body 1 can be machined out, but a nozzle welding structure may be provided as long as the fixing plate 7 is not fitted.

  By configuring the portion where the heat transfer tube bundle 4 is fitted as described above as a single body, not only can the deformation when the heat transfer tube bundle 4 is fitted to the main body 1 be suppressed, but also the heat transfer tube bundle 4 is fixed. Therefore, it is possible to stably maintain the contact state with the O-ring 8 disposed on the outer peripheral portion of the fixing plate 7 for the purpose.

  As a result, there is an effect that the heat medium can be effectively prevented from entering the fluid such as drinking water flowing in the heat transfer tube 4.

  Furthermore, since the heat transfer tube 4 used in the present invention is configured in a straight line without a bent portion in the middle, it can be easily cleaned and removed from the deposits and precipitates generated inside. There is an effect. In addition, the linear shape said here is irrelevant to a corrugated side surface, and means that the axis | shaft of a pipe | tube is comprised linearly.

  When the heat exchanger according to the present application is used for heat treatment of foods such as juice and coffee, the portion of the heat exchanger that is in contact with the edible fluid is preferably composed of metallic titanium, Especially, it is preferable to comprise with pure titanium equivalent to JIS 1 type or 2 types.

  By configuring the heat exchanger with the titanium material as described above, there is an effect that impurity metal contamination to the food circulating through the inside can be effectively suppressed.

  In addition, it is not necessary to comprise by titanium metal except the part which the said edible fluid contacts, For example, you may comprise by the material excellent in heat conduction like copper. By adopting the material configuration as described above, it is possible not only to effectively suppress the material cost of the heat exchanger M according to the present invention, but also to effectively increase the efficiency of heat exchange. Is.

  Further, by engaging a plurality of heat exchangers M according to the present invention in series or in parallel, it is possible to control the temperature of the fluid to be circulated inside more efficiently.

  In addition, in the fixed end (fixed flange 6 side) of the heat exchanger M, the heat transfer tube 4 and the flange 6 are comprised as a welding structure. As a result, the drinking water heated by the heat medium while flowing in the heat transfer tube 4 is collected in the lid 2b and transferred to the next process from the nozzle 5b.

  According to the heat exchanger M described above, the effect of being able to proceed with the cooling or heating operation efficiently without being contaminated by the heat medium even if it is not suitable for impurities such as food. It plays.

Hereinafter, the effects of the present invention will be specifically described with reference to Examples and Comparative Examples. The specifications of the heat exchanger used in the examples are listed below.
1. Main body 1) Material: Pure titanium 2 types Heat transfer tube 1) Material: Pure titanium 2 types 2) Type: Extraction tube 3. Seal part 1) O-ring material: Silicone rubber 4. Heat-treated fluid: drinking water Medium: Hot water 1) Type: Hot water 2) Temperature: 95 ° C to 135 ° C

[Example 1]
Using the apparatus configuration shown in FIG. 1, drinking water high-temperature sterilization treatment was performed under the above conditions. The drinking water after the high temperature sterilization treatment was analyzed, but no increase in new elements or elements dissolved in the drinking water was confirmed as compared with the analysis value before the treatment.

[Example 2]
The apparatus configuration shown in FIG. 1 was used, and heat was exchanged with the refrigerant under the above conditions to cool the drinking water. The drinking water after the treatment was analyzed, but no increase in new elements or elements dissolved in the drinking water was confirmed as compared with the analysis value before the treatment.

[Comparative Example 1]
Using a known heat-fixed both-end heat exchanger, the heat exchanger was heated or cooled several times, and the whole was deformed and partially leaked, so the test was terminated halfway. .

  The present invention provides a heat exchanger suitable for heat treatment of products that require hygiene reliability such as foods, beverages, and pharmaceuticals.

M ... heat exchanger,
1 ... body,
2a, 2b ... lid,
3a, 3b ... nozzle,
4 ... Heat transfer tube (bundle),
4a ... corrugated part,
4b ... Reduced diameter part,
4c ... diameter-expanded part,
5a, 5b ... nozzles,
6 ... fixed flange (fixed tube plate),
7 ... Fixed plate (tube plate that can be moved),
8 ... O-ring.

Claims (5)

  A multi-tube heat exchanger, wherein the heat exchanger includes a heat transfer tube bundle composed of a plurality of heat transfer tubes, a fixed tube plate for fixing the heat transfer tube bundle, and a tube disposed at the other end of the fixed tube plate of the heat transfer tube bundle. It is comprised from the main body and cover body which accommodate a board and the said member, and it is comprised so that the tube plate arrange | positioned at the other end of the fixed tube plate of the said heat exchanger tube bundle can be fitted in the inside of a main body. It is a heat exchanger, Comprising: The tube sheet arrange | positioned at the other end of the said fixed tube sheet is comprised so that it can move freely in the longitudinal direction of a heat exchanger tube, The multi-tube heat exchanger characterized by the above-mentioned.   The multi-tube heat exchanger according to claim 1, wherein a seal member is disposed on an outer peripheral portion of the tube sheet.   The multi-tube heat exchanger according to claim 1, wherein a portion of the main body into which the tube sheet is fitted is formed by cutting.   The multi-tube heat exchanger according to claim 1, wherein an uneven surface constituted by a part of a spherical surface is formed on a surface of the heat transfer tube. The multitubular heat exchanger according to any one of claims 1 to 4, wherein a plurality of the multitubular heat exchangers are connected.

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