JPH0539319Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention relates to the improvement of a shell-and-tube heat exchanger that uses plastic tubes as heat transfer tubes. This invention relates to a heat exchanger that can be repaired.

[Conventional technology]

Conventionally, a shell-and-tube heat exchanger has a heat exchanger tube bundle of plastic tubes inserted into the shell.
For example, there is one described in Japanese Utility Model Application Publication No. 192088/1988. This type of heat exchanger has a plurality of buff-full plates inserted through a bundle of plastic tubes and arranged at predetermined intervals almost perpendicular to the longitudinal direction of the bundle, and both ends of the bundle of plastic tubes are covered with sleeves. A bundle of heat transfer tubes whose open ends are formed into a honeycomb shape by being fused together with the heat exchanger tube is disposed within the jacket, and both end portions of the heat transfer tube bundle are hermetically connected to the jacket. Here, in addition to controlling the flow direction of the outer fluid, the baffle plate supports a large number of plastic tubes one by one or in groups of multiple tubes, thereby creating gaps within the heat transfer tube bundle. , which improves the contact between the heat transfer tube and the outer fluid.

[The problem that the idea aims to solve]

By the way, in such a heat exchanger, since the heat transfer tube is made of plastic, if cooling water mixed with foreign matter such as a lump of iron rust is poured into the jacket side, the plastic tube may be damaged by the foreign matter. Sometimes. In such cases, the repair method used is to pull out the damaged plastic tube from the bundle, cut it on both sides of the damaged part, and then heat the cut surfaces to melt them and sandwich them together to seal them. .

However, if the damage occurs near the sleeve joint, it is difficult to pull the damaged part out of the bundle because the distance between the damaged part and the sleeve joint is short, and furthermore, the damage occurs near the sleeve joint. Because the plastic tubes are densely packed,
When repairing otherwise normal plastic tubes, there was no space to put in the heat insulating material and sealing tools that protect them from the heat, so there was a problem that the tubes could no longer be repaired and had to be discarded.

Therefore, the object of this invention is to provide a shell-and-tube type heat exchanger that solves the problems of the prior art described above and can reliably repair even if the plastic tube is damaged.

[Means for Solving the Problems] In order to achieve the above-mentioned purpose of this invention, this invention bundles a plurality of plastic tubes and integrally connects both end portions with sleeves to form a honeycomb. In a shell-and-tube heat exchanger in which a bundle of tubes arranged in a shape is disposed in an inner space of a mantle and hermetically connected to the mantle at both end portions, the tube bundle is close to the sleeve joint part. It is characterized in that the outer periphery of the part is held by a gripping body.

[Effect]

In the heat exchanger configured as described above, the tube bundle is held near the sleeve joint portion by the gripping body, and the gap between the tubes is reduced. For this reason, when a liquid containing foreign matter is poured into the jacket, the middle part of the plastic tube may be damaged, but the foreign matter may get inside the part held by the gripper and damage the plastic tube. It will not be damaged. Therefore, even if damage occurs near the held part, if the gripping body is removed, the plastic tube in that part will be freed, making it possible to repair it.

``Embodiment'' The figure is a partial longitudinal sectional side view showing an embodiment of the shell-and-tube heat exchanger according to this invention.

In the figure, the mantle 10 is a hollow body, and flanges 11 are provided at both longitudinal ends thereof, and an inlet 13 and an outlet 14 for fluid on the mantle side are provided on the peripheral wall near the flange 11, respectively. . The flange 11 also includes a guide flange 1.
A nut member 16 is clamped by a presser flange 17 via a bolt 5, and these are fastened with bolts 18. Note that the joint surface between the flange 11 of the mantle 10 and the guide flange 15, and the nut member 1
Seal rings 19a and 19b are provided on the joint surfaces of guide flange 6 and guide flange 15, respectively.

Inside the mantle 10 is a tube bundle 20 in which plastic tubes are divided into groups of multiple tubes.
are inserted along the longitudinal direction. here,
Plastic tubes are made of materials that have properties that match the properties of the jacket and tube fluids, and are suitable for a variety of applications such as corrosive liquids or gases, high-purity chemicals, or water. , fluorine-based resins are suitable. Then, both end portions of the tube bundle 20 are integrally bonded by heat fusion or the like by fitting the sleeve 21 around the outer periphery thereof.
It is formed into a honeycomb-like airtight joint structure. Furthermore, the tube bundle is held by a gripping body 24 made of a linear body 23 such as a monofilament wound tightly in the longitudinal direction of the tube bundle 20 in the vicinity of the sleeve joint portion 22, and each plastic tube is are held in close contact.

Further, this tube bundle 20 is provided with a buttful plate 2 which is inserted perpendicularly to the longitudinal direction of the tube bundle 20 at both end sides of each group and at a position divided at an appropriate interval between both ends.
5, each group of tubes is supported in a mutually intersecting state.

In addition, a plurality of rods 26 are inserted into the peripheral edge of the buffle plate 25 along the longitudinal direction of the tube bundle 20 to connect each buffle plate 25, and each rod 26 is provided with a plurality of rods 26 that connect adjacent buffle plates. A spacer tube 27 having a length equivalent to the mutual spacing is inserted between the plates 25, and both ends of the rod 26 are screwed onto the outside of the buffful plate 25 on both end sides of the tube bundle 20. It is fixed by a screw nut 28.

Then, the tube bundle 2 charged into the mantle 10
0, both end portion sleeves 21 are attached to the mantle 1.
The nut member 16 is brought into contact with the nut member 16 attached to the open end of the
The base member 32 is screwed onto the base member 32 to connect the base member 32 to the base member 32. In addition, on the fitting circumferential surface between the cap member 32 and the nut member 16 and the joint surface between the cap member 32 and the sleeve 21 of the tube bundle 20,
Seal rings 33a and 33b are provided, respectively.

In the heat exchanger having such a configuration, the tube-side fluid supply pipe and discharge pipe are connected to the cap members 32 at both end portions of the tube bundle 20, and each plastic of the tube bundle 20 is connected from the supply port-side cap member 32 to The tube-side fluid is supplied to the tube and discharged through the mouthpiece member 32 on the discharge port side, and an inflow pipe and an outflow pipe of the mantle-side fluid are connected to the inflow port 13 and the outflow port 14 of the mantle 10, and the inflow port By moving the mantle-side fluid supplied from the mantle 13 along the longitudinal direction of the mantle 10 while controlling its flow direction with the buff-full plate 25 and discharging it from the outlet 14, a gap between the tube-side fluid and the mantle-side fluid is created. to perform heat exchange.
In this case, the sleeve joint 22 of the tube bundle 20
The part close to the plastic tube is held by the gripping body 24 made of a wound layer of monofilament 23, and the gap between each tube is reduced, so that foreign matter that may cause damage to the plastic tubes does not get mixed into the fluid on the mantle side. Even if it is held, foreign matter will not enter the held part, and damage to that part will be prevented.

Therefore, by appropriately selecting the width of the portion held by the gripping body 24, the length necessary for taking out the plastic tube can be secured in advance, so that the damaged plastic tube can be secured and repaired. This eliminates the waste of having to discard expensive heat exchangers that cannot be repaired, as was the case in the past.

In addition, in the above embodiment, a case was explained in which a monofilament was wound around as a gripping body.
It may be covered with a heat shrink tube. In this case, the heat shrink tube must be cut during repair;
It has the disadvantage that it cannot be reused, but on the other hand,
It has the advantage of being easier to install than monofilament wrapping. Further, the gripping body does not necessarily have to be made of one layer, but can of course be made of two or more layers, and the width of the gripping portion is selected depending on the number of plastic tubes, etc.

Furthermore, the tube bundles 20 may be inserted into the bundle plate 25 one by one without being divided into groups each having a plurality of tubes, and the tube bundles 20 may be inserted into the bundle plate 25 one by one without being alternately focused and dispersed as in the embodiment. , may be distributed end to end.

[Effect of idea]

As explained above, according to this invention, since the outer periphery of the tube bundle near the sleeve joint is held by the gripping body, there is no foreign matter in the fluid on the outer side that may cause tube damage. Even if it is contained, the plastic tube will not be damaged in the gripped part. Therefore, the length required for repairing the plastic tube can be secured by selecting the width of the gripping body in advance, so there is no need to discard the plastic tube because it cannot be repaired, and even if it is damaged. It can be used for a long time while being repaired.

It should be noted that this invention is not limited to the above-mentioned embodiments, and various changes can be made within the technical concept of this invention, such as changing the connection structure between the tube bundle and the mantle.

[Brief explanation of the drawing]

The figure is a partially vertical side view showing an embodiment of the shell-and-tube heat exchanger according to this invention. 10...coat, 20...tube bundle, 21...
Sleeve, 22... Sleeve joint portion, 24... Gripping body, 25... Buffful plate.

Claims (1)

[Scope of utility model registration request] A tube bundle consisting of a plurality of plastic tubes arranged in a honeycomb shape with both end portions integrally connected to the sleeve is arranged in the inner cavity of the mantle, and both end portions are hermetically connected to the mantle. A shell-and-tube heat exchanger characterized in that the outer periphery of the tube bundle near the sleeve joint portion is held by a gripper.