JP7228841B2 - Heat exchanger - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger comprising a plurality of resin heat transfer tubes that exchange heat between fluids flowing inside and outside.

As this type of heat exchanger, conventionally, a number of fluororesin tubes are bundled as heat transfer tubes, and the ends of the bundles are heat-sealed to form a honeycomb-like integrated body ( For example, see Patent Documents 1 and 2). Such heat transfer tubes are thin, and may be damaged or clogged due to vibration caused by the heat of the fluid inside and outside, the flow of the fluid, rubbing between the tubes, and the like. However, it is not possible to partially remove and replace the heat transfer tubes that are integrated in a honeycomb shape as in the conventional method. Closing the opening is done. However, blocking the damaged tube in this way causes a decrease in heat exchange efficiency, and there is a problem that heat exchange processing cannot be performed as designed.

JP-A-60-259898 JP-A-63-6395

Therefore, in view of the above-mentioned situation, the present invention aims to solve the problem that it is easy to replace only a part of the heat transfer tubes, the heat exchange efficiency is excellent, and the heat transfer tubes are less likely to be damaged. The point is to provide a heat exchanger.

The present invention includes the following inventions.
(1) A heat exchanger consisting of a plurality of resin heat transfer tubes that exchange heat between fluids flowing inside and outside, wherein the heat transfer tubes are arranged in a plurality of sets of two or more heat transfer tubes. Each pair is provided with a first holding member for integrally sealingly holding the tube ends with the openings open, and the plurality of first holding members are integrally formed with the end faces open. A heat exchanger comprising a second holding member for hermetically holding the heat exchanger.
(2) A support member for supporting the intermediate portions of the heat transfer tubes, in which a bundle of two or more heat transfer tubes forming the group is passed through, and the intermediate portions of the heat transfer tubes are divided into the groups. A heat exchanger according to (1), wherein a support member having a plurality of support holes or support grooves is provided.
(3) The heat transfer tube is a fluororesin tube having an inner diameter of 4.5 mm or more, and is a supporting member that supports a middle portion of the heat transfer tube, and the heat transfer tube is curved to form a single or The heat exchanger according to (1) or (2), which is provided with a plurality of support members that support a plurality of loops.
(4) Any one of (1) to (3), wherein each set is provided with a spacer material for holding the outer surfaces of the two or more heat transfer tubes forming each set in a state in which they are separated from each other. A heat exchanger as described.
(5) The heat exchanger according to any one of (1) to (4), wherein the first holding member holds the outer peripheral surfaces of the tube ends in close contact with each other.
(6) The heat exchanger according to any one of (1) to (5), wherein the second holding member holds the outer peripheral surface of the first holding member in close contact.

According to the heat exchanger according to the present invention as described above, when the heat transfer tubes are damaged or the like, the set of heat transfer tubes to which the damaged tubes belong is removed together with the first holding member from the second holding member. Therefore, the heat exchanger can be efficiently repaired without closing the ends of the damaged heat transfer tubes or replacing the entire heat transfer tubes.
In addition, when a bundle of two or more heat transfer tubes forming a set is passed through and a support member having a plurality of support holes or support grooves is provided for supporting the intermediate portions of the heat transfer tubes in a state divided for each set. Since not only the end portions but also the intermediate portions of the tubes are grouped together for each set (bundle) of the tubes, it is possible to easily replace the tubes in units of the set even during the replacement operation described above. In addition, by dividing the tubes into groups and supporting the middle part, it is possible to reduce the interference between the tubes and make it difficult for the tubes to be damaged. is promoted, and the heat exchange efficiency is also improved.

Further, the heat transfer tube is a fluororesin tube having an inner diameter of 4.5 mm or more, and is a support member that supports the middle part of the heat transfer tube, and the heat transfer tube is curved to form a single or a plurality of loops. When a plurality of support members are provided to support the drawn state, the relatively thick tube can prevent damage and clogging due to dust in the fluid, and the loop increases the distance and maintains excellent heat exchange efficiency. be able to.
Further, when a spacer member is provided to keep the outer surfaces of the two or more heat transfer tubes forming each set apart from each other in the middle, the interference between the tubes is further reduced, and damage to the tubes is less likely to occur. Furthermore, gaps are secured between the tubes, the flow of fluid is promoted, and the heat exchange efficiency is further improved.

BRIEF DESCRIPTION OF THE DRAWINGS The perspective view which shows the whole structure of the heat exchanger which concerns on representative embodiment of this invention. The front view which similarly shows a heat exchanger. The side view which similarly shows a heat exchanger. FIG. 4 is a side view of the same heat exchanger with left and right side seal baffles omitted; The top view which similarly shows a heat exchanger. The perspective view which similarly shows the principal part of a heat exchanger. FIG. 4 is a partially broken perspective view showing the structure of the inlet or outlet of the heat exchanger. FIG. 4 is an explanatory diagram showing a set of heat transfer tubes held by a first holding member of the heat exchanger as well. FIG. 3 is an explanatory diagram showing only the support frame and support members of the heat exchanger and omitting the others. (a) to (c) are similarly explanatory views showing spacer members attached to the heat transfer tube set of the heat exchanger, (a) being a perspective view, (b) being a plan view, and (c) being a side view. be. FIG. 11 is an explanatory diagram showing a state in which the posture of the spacer material is similarly changed; Explanatory drawing which similarly shows the use condition which attached the spacer material to the tube set.

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
1 and 4, the set of heat transfer tubes (reference numeral 2) is illustrated in a simple cylindrical shape, but in reality, the heat transfer tubes are cylindrical as shown in FIGS. 7 and 8. 20 are bundled together. 1, the spacer member 6 is simply drawn as a simple circular ring, but in reality, as shown in FIGS. It is a member.

The heat exchanger 1 of the present invention, as shown in FIGS. Both ends of the tubes are collectively provided with a fluid inlet 11A (11B) and a fluid outlet 12A (12B) for flowing fluid into each tube. In this embodiment, the liquid in the tank is immersed in a pickling tank, a plating tank, or the like to heat or cool the liquid. 10 above), and the heat transfer tube 20 extends downward from there, folds back at the lower end, and returns upward in a U shape (a loop shape (half U shape) in which the middle part of a part of the tube is wound in a loop shape. )), the heat exchanger 1 will be described as an example.

However, the present invention is not limited to such a U-shaped heat exchanger, and may be a coil type, a random type with a free shape, a shell tube type that is coaxially and straightly arranged in a pipe, or the like. Various conventionally known forms can be used. In this example, two pairs of inlets and outlets (inlet 11A, outlet 12A and inlet 11A, outlet 11B) are provided to allow the fluid to flow through the plurality of heat transfer tubes 20, and the heat transfer tubes Although 20 is roughly divided into two flow paths, it is not limited to this. In addition, it can also be configured to be suitable for various conventionally known uses. In this embodiment, the heat transfer tube 20 and other components are made of fluororesin that can withstand strong acid fluids, or are made of stainless steel with a fluororesin coating on the outer surface. The material can be appropriately selected according to the use of the heat exchanger.

In the heat exchanger 1 according to the present embodiment, the top plate 10 at the upper end provided with the inflow port 11A (11B) and the outflow port 12A (12B) is fixed to the upper part of a tank such as a pickling tank or a plating tank (not shown). , the downwardly extending heat transfer tube 20 is immersed in the fluid in the bath. A plurality of anti-vibration rods 72 are hung downward from the top plate 10 on the front side of the heat exchanger facing upstream with respect to the flow direction of the fluid in the tank indicated by the arrows in FIG. The bottom end 720 of the heat exchanger 720 abuts against the bottom surface of the tank, thereby holding the entire heat exchanger 1 in a stable posture in the flow of fluid. The plurality of heat transfer tubes 20 forming each pair are further divided into a plurality of sets (tube sets 2) each consisting of two or more heat transfer tubes 20, and the heat transfer tubes are separated by supporting members 50 to 56, which will be described later. are supported in a state that they are separated for each tube set 2. 7 to 9, the openings at both ends of the heat transfer tubes 20 are in a state in which the ends of the two or more heat transfer tubes 20 are opened for each tube set 2. A first holding member 3 is provided for integrally sealingly holding a plurality of first holding members 3, and a second holding member 4 is provided for integrally sealingly holding a plurality of first holding members 3 with their end surfaces open.

Thus, in the heat exchanger 1 according to the present invention, the ends of the two or more heat transfer tubes 20 constituting each tube group 2 are gathered together by the first holding member 3 at each inlet or outlet, and further Since the plurality of first holding members 3 are grouped together by the second holding member 4, each first holding member 3 can be removed from the second holding member 4 and easily replaced in units of tube sets. It is configured. Further, the intermediate portions of the heat transfer tubes are also supported separately for each tube set 2 by supporting members 50 to 56 . Therefore, it is possible to easily replace each pair during the replacement operation. In addition, by dividing the tubes into groups and supporting the middle part, it is possible to reduce the interference between the tubes and prevent the tubes from being damaged. The flow is promoted, and the heat exchange efficiency is also improved.

In this embodiment, the plurality of heat transfer tubes 20 forming each flow path are divided into a predetermined number of tube sets 2 , and each set is composed of a predetermined number of heat transfer tubes 20 . The first holding members 3 provided at both ends of each tube group 2 are formed with the same number of holding holes 30 penetrating vertically as the heat transfer tubes 20 constituting the tube group 2 . The inner diameter of the holding hole 30 is approximately equal to the outer diameter of the heat transfer tube 20, and the heat transfer tube 20 is mounted in such a state that the outer peripheral surface of the end portion of the heat transfer tube 20 is in close contact with the inner peripheral surface of the holding hole 30 with an adhesive or heat sealing. It is The first holding member 3 is preferably made of the same kind of resin as the heat transfer tube 20 . Each inlet or outlet is provided with first holding members 3 corresponding to the number of tube sets 2 of one channel.

In a conventional heat exchanger, all the tubes are bundled and heat-sealed to form an integrated end. However, if each tube end is attached to the holding hole 30 of the first holding member 3 as in the present invention, the outer circumference of the tube end will not be crushed against each other, and the flow will be stable. The holding strength can be maintained. These first holding members 3 are held by one second holding member 4 at the inlet or outlet. In the second holding member 4, the same number of holding holes 40 as the number of holding first holding members 3 are formed. The outer peripheral surface of the first holding member 3 holding the heat transfer tube 20 is attached in close contact with the inner peripheral surface of the holding hole 40 with an adhesive or heat sealing. . The second holding member 4 is preferably made of the same kind of resin as the first holding member 3 .

The second holding member 4 is a metal support plate 19 that is attached to the mounting hole 18 of the top plate 10 by welding or the like so as to block the hole. is fixed by a mounting screw 41 on a support plate 19 provided with insertion holes 190 through which the tube set 2 held by the first holding member 3 can pass downward at positions corresponding to . A peripheral edge portion of the support plate 19 is provided with a screw hole 191 into which a mounting screw 80 for mounting the connection flange 8 (to be described later) is screwed. In this way, an inlet 11A (11B) and an outlet 12A formed by the end openings of the heat transfer tubes 20 of the heat transfer tube set 2 held on the top plate 10 by the first holding member 3 and the second holding member 4 are provided. (12B) is attached with a mounting screw 80 to a connection flange 8 for connecting piping (not shown) for supplying/discharging fluid passing through the heat transfer tube 20, respectively.

The support members 50 to 56 that support the intermediate portions of the heat transfer tubes are plate members supported by the support frame 7 made of a plurality of metal pipes extending downward from the top plate 10. A plurality of support holes 500 are formed to support the tube set 2 . Since the tube set 2 is held in a form forming a single loop or a plurality of loops, the number of support holes 500 is set to be larger than the number of tube sets 2 to reciprocate up and down (twice). The lower support member 56 supports the bending region where each tube set 2 bends at the lower end and folds upward. Specifically, each tube set 2 is folded in an inverted V shape when viewed in cross section, and each tube set 2 is divided into three equal parts (a position bent by 30° and a position bent by 60°). It is configured to stably hold the bending area of . In addition, the upper support member 50 supports the bent region where each tube set 2 is bent again at the upper portion and folded back downward.

Specifically, it has a shape folded in a V-shape in cross section, and each tube set is divided into three equal parts (a position bent by 30° and a position bent by 60°). 2 bending regions can be stably held. These support members 50 and 56 are sandwiched between the central portions of the support members 51 and 55 where the V-shaped bent portions 501 are adjacent to each other and the pressing bar member 502. It is fixed to the central portion by means of mounting screws 503 screwed into 502 and supported at four corners by front and rear frame rods 73 or U-shaped frame rods 70 forming the support frame 7 .

Each support hole 500 holds the tube sets 2 separately from the other tube sets 2 by allowing the tube sets 2 to pass therethrough, so that the fluid in the tank reliably enters between the tube sets 2 to increase the heat exchange efficiency. This is a hole to prevent mutual contact and damage. In addition, the inner diameter is set so that the tube set 2 is loosely fitted so that the heat transfer tube 20 can move in the axial direction to some extent within the support hole 500 . As a result, the heat transfer tube 20, which receives a tensile force from the fluid flowing in the tank, moves in the axial direction without being restrained by the support hole 500, thereby releasing the force and preventing damage to the tube due to the tensile force. It is The tube sets that are loosely fitted in the respective support holes 500 in this manner facilitate the work of replacing tube sets when the heat transfer tubes 20 are clogged or damaged. In this example, the support hole 500 allows one tube set 2 to pass through. , or an open support groove may be used. The material of the support members 50-56 may be a metal plate whose outer surface is coated with resin. It is preferable that the whole is composed of a plate made of resin (made of fluororesin in this example).

The support frame 7 includes U-shaped frame rods 70 arranged at left and right side positions, rod supports 71 connecting the left and right U-shaped frame rods 70 to each other on the lower rear side, and the upstream side of the flow of the fluid in the tank. Four anti-vibration rods 72 suspended parallel to each other on the facing front side, with lower ends 720 abutting the bottom of the tank, and between two upper ends forming a U shape at the upper position of each U-shaped frame rod 70 It is composed of a pair of left and right front and rear frame rods 73 that are connected to reinforce as a frame-like frame and support the support member 50 . The upper end of the U-shaped frame rod 70 and the upper end of the anti-vibration rod 72 pass through the top plate 10 and are fixed to bracket plates 14 to 16 provided on the upper surface of the plate using U-shaped fasteners 17. ing.

Both ends of the rod support 71 and both ends of the pair of left and right front and rear frame rods 73 are provided with couplings 74 for coupling to each other through the U-shaped frame rods 70 . Each rod of these support frames 7 is made of metal (made of stainless steel in this example) with a fluororesin film formed on its outer surface, and the connector 74 is also a molded product made of fluororesin. On the outside of the left and right U-shaped frame rods 70 of the support frame 7, the fluid that has flowed to the front of the heat exchanger 1 in the tank is prevented from escaping to the left and right outside. A plate-like side seal baffle 13, which is also a fluororesin molded product, is provided to ensure that the fluid can be taken in. As shown in FIG. Similarly, in order to control the flow in the tank and take the fluid into the heat transfer tube 20 side of the heat exchanger 1, the rear end of the support member 56 at the lower end extends obliquely downward and forward to contact the bottom surface of the tank. A contacting plate-shaped tank flap 560 is provided, and the fluid flowing to the front surface of the heat exchanger 1 in the tank and passing through the gap at the lower end is directed upward along the tank flap 560 to the heat transfer tube 20 It is configured so that it can be captured by

In this embodiment, the heat transfer tubes 20 have a structure that forms a loop to increase the distance. can do. That is, in the present embodiment, the heat exchange efficiency of each heat transfer tube 20 is increased by the distance, so the number of tubes can be reduced accordingly, and as a result, the inner diameter of each heat transfer tube 20 can be increased, and problems such as clogging can be prevented. In addition, it is possible to increase the wall thickness and improve the durability.

Specifically, the heat transfer tube 20 of this example is a fluororesin tube having an inner diameter of 4.5 mm or more, more specifically, an outer diameter of 6 mm, an inner diameter of 5 mm, a wall thickness of 0.5 mm, and a PFA material. ing. A conventional heat transfer tube for the same application has an outer diameter of 3.18 mm, an inner diameter of 2.54 mm, and a wall thickness of 0.32 mm. For each tube group 2, one or more spacer members 6 are provided to keep the outer surfaces of the two or more heat transfer tubes 20 forming each group apart from each other. The force received from a highly viscous fluid such as concentrated sulfuric acid causes the tubes to sway greatly, and the tubes are likely to come into contact with the inner wall of the device or contact each other, causing damage. By bundling together, the interference between the tubes is reduced, and damage to the tubes is less likely to occur. Since the gap is secured between the tubes, the flow of fluid is promoted and the heat exchange efficiency is also improved.

As shown in FIGS. 10(a) to 10(c), the spacer material 6 has locking grooves 600 open outwardly at predetermined intervals for locking the heat transfer tubes 20 fitted from the outside on the outer peripheral portion. , and the inner region is also formed with surrounding grooves 601 , 601 capable of surrounding one or more heat transfer tubes 20 . More specifically, a pair of left and right semi-annular (substantially C-shaped) tube holding portions 60A and 60B forming the outer peripheral portion and the end portions 60a of the tube holding portions facing each other to form an annular shape. The surrounding grooves 601, 601 are the spaces before and after the connecting rod portion 61 of the annular inner space. Both of the surrounding grooves 601, 601 are open to the outside through a gap 62 between the facing ends 60a of the tube holding portions 60A, 60B.

This gap 62 is a very small gap that does not allow the heat transfer tubes to pass through when the spacer material 6 is in a normal annular posture. As shown in FIG. In a posture in which 60A and 60B are rotated and twisted in opposite directions, the gap 62 is widened, and the heat transfer tube 20 can be taken in and out of the surrounding groove 601 through the gap 62 thus opened. FIG. 12 shows a state in which the heat transfer tubes 20 forming the tube group 2 are held apart from each other by the spacer member 6 . To attach the heat transfer tubes 20 to the spacer members 6, first, the spacer members 6 are placed vertically and sandwiched between bundles of the heat transfer tubes 20. At the sandwiched position, the left and right tube holding portions 60A and 60B are grasped and connected as described above. The gap 62 is widened by twisting the rod portion 61 , and in this state, the heat transfer tubes located on the center side of the tube set 2 are inserted into the surrounding grooves 601 , 601 through the gap 62 .

Next, the spacer member 6 is untwisted and returned to the normal posture before twisting in which the gap 62 is reduced. Thereby, the spacer material 6 is held in a state in which the heat transfer tube 20 is passed. Then, another heat transfer tube 20 is fitted into the locking groove 600 of each tube holding portion 60A, 60B. This completes the mounting of the spacer member 6 . Removal can be done easily by reversing the procedure. As described above, according to the spacer member 6 of the present embodiment, it is not necessary to insert the heat transfer tube 20 located on the center side from the end portion into the inside, and it is possible to easily attach the heat transfer tube 20 from the side in the middle of the tube. In this example, after each tube set 2 is supported by the support members 50 to 56, the spacer member 6 can be easily attached from the side to the intermediate portion of each heat transfer tube 20 of the tube set 2 between the support members. , assembling and dismounting are easy, and workability is remarkably improved.

Although the embodiments of the present invention have been described above, the present invention is by no means limited to such embodiments, and can of course be embodied in various forms without departing from the gist of the present invention.

1 Heat Exchanger 2 Tube Set 3 First Holding Member 4 Second Holding Member 6 Spacer Material 7 Support Frame 8 Connection Flange 10 Top Plate 11A, 12A Inlet 11B, 12B Outlet 13 Side Seal Baffle 14-16 Bracket Plate 17 Fastener Bracket 18 Mounting hole 19 Supporting plate 20 Heat transfer tube 30 Holding hole 40 Holding hole 41 Mounting screw 50-56 Support member 60A, 60B Tube holder 60a End 61 Connecting rod 62 Gap 70 U-shaped frame rod 71 Rod support 72 Deflection Stop rod 73 Front and rear frame rod 74 Connector 80 Mounting screw 190 Insertion hole 191 Screw hole 500 Supporting hole 501 Bent portion 502 Pressing bar 503 Mounting screw 560 Tank flap 600 Locking groove 601 Surrounding groove 720 Lower end

Claims (5)

A heat exchanger consisting of a plurality of resin heat transfer tubes that exchange heat between fluids flowing inside and outside,
The heat transfer tubes are divided into a plurality of sets of two or more heat transfer tubes, and each set is provided with a first holding member for integrally sealing and holding the tube ends in an open state. ,
providing a second holding member that integrally seals and holds the plurality of first holding members with their end surfaces open;
A support member for supporting the middle portion of the heat transfer tube, wherein a bundle of two or more heat transfer tubes forming the set is passed through, and the middle portion of the heat transfer tube is separated for each set and is loose. A heat exchanger comprising a supporting member having a plurality of supporting holes or supporting grooves for supporting in a fitted state . The heat transfer tube is a fluororesin tube having an inner diameter of 4.5 mm or more,
and a plurality of supporting members for supporting the intermediate portion of the heat transfer tube, wherein the heat transfer tube is curved to form a single or a plurality of loops . A heat exchanger as described . 3. The heat exchanger according to claim 1, wherein a spacer member is provided for each of said sets so as to keep the outer surfaces of said two or more heat transfer tubes forming each set apart from each other. The heat exchanger according to any one of claims 1 to 3 , wherein the first holding member holds the outer peripheral surfaces of the tube ends in close contact with each other. The heat exchanger according to any one of claims 1 to 4 , wherein the second holding member holds the outer peripheral surface of the first holding member in close contact.

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