JPH0624707Y2 - Multi-tube heat exchanger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Purpose of the Invention] (Industrial field of application) The present invention relates to a multi-tube heat exchanger having a floating tube plate, and more particularly, to an internal fluid from a sliding portion of the floating tube plate. The present invention relates to a multi-tube heat exchanger suitable for preventing leakage to the outside.

(Prior Art) As shown in FIG. 2, the multi-tube heat exchanger has a main body 1,
It is composed of a heat transfer tube 2, a tube plate 3 and a water chamber body 4. The main body cylinder 1 and the water chamber body 4 are separated by a tube sheet 3, and the main body cylinder 1 is inserted through the surface of the heat transfer tube 2 arranged in the main body cylinder 1.
The internal fluid and the fluid in the water chamber body 4 have a structure for heat exchange. In general, the heat transfer tube 2 is often made of a copper-based material from the standpoint of placing importance on heat transfer performance, while the main body barrel is made of an iron-based material in consideration of internal pressure. Further, since the temperature of the fluid inside the heat transfer tube 2 is different from the temperature of the fluid inside the main body cylinder 1, that is, outside the heat transfer tube, a stress is generated in the tube sheet 3 and the heat transfer tube 2 due to the difference in thermal expansion between the heat transfer tube 2 and the main body cylinder 1. Conventionally, in order to reduce this stress, a floating tube sheet may be adopted in which one tube sheet is fixed to the main body and the other tube sheet is slid in the axial direction along the inner surface of the main body. As shown in FIG. 3, in the multi-tube heat exchanger having the floating tube plate, the fixed tube plate 5 is connected to the connecting portion of the main body cylinder 1 of one water chamber cylinder 4, and the floating tube plate 6 is connected to the other. Provided in each section. The outer periphery of the floating tube plate 6 is manufactured so as to be inscribed in the main body cylinder 1 as shown in FIG. 4, and the O-ring is formed in the groove 7 formed in the inner periphery of the main body cylinder 1 and the water chamber cylinder 4. 8 is inserted and the O-ring is in strong contact with the floating tube plate 6 to prevent the fluid in the main body barrel 1 and the fluid in the water chamber barrel 4 from leaking to the sliding portion.

(Problems to be Solved by the Invention) However, there is usually a certain gap between the inner surface of the main body 1 and the outer periphery of the floating tube plate 6 in order to maintain smoothness when sliding. Therefore, the pressures of the fluid in the main body cylinder 1 and the fluid in the water chamber cylinder 4 act on the gap portions, and the fluid tends to flow to the outside. This fluid deforms the O-ring 8 inserted in the groove 7 and seals it by the restoring force.
It is extremely difficult to set the contact pressure on the outer circumference of the floating tube sheet 6 according to the planned value with the current processing technology. Also, after assembling whether the setting of the O-ring 8 is as planned,
Since there is no way to check, the actual body 1 side and the water chamber body 4
It is necessary to direct the fluid to the side and apply pressure to check for leaks from this site. On the other hand, even if it is confirmed that the O-ring 8 is completely set and there is no leakage, leakage from this part may be detected during use. The O-ring 8 generally uses rubber,
We selected a material with a diameter that can completely close the cross-sectional area of the groove 7. However, depending on the deformation inside the groove 7, when used for a long period of time, rubber deteriorates and the restoring force weakens and the sealing function is reduced. It may not be maintained. In particular, this structure is often used under the condition that the fluid on the main body 1 side such as an oil cooler is oil and the temperature is high, and in this case, the deterioration of the rubber becomes more rapid.

In addition to the deterioration of the rubber itself, the floating tube plate 6 is constantly moving due to the difference in thermal expansion between the main body 1 and the heat transfer tube 2. Due to this motion of the floating tube plate 6, the O-ring 8 moves while being applied with a contact force, and the surface wear becomes remarkable. As the wear progresses, the cross-sectional area of the O-ring 8 decreases as compared with the planned value, and it becomes difficult to maintain the specified contact force, causing a fluid leakage accident.

It is an object of the present invention to provide a multi-tube heat exchanger which can maintain the sealing function of the floating tube plate portion even during long-term use and can be easily inspected and repaired from the outside.

[Constitution of device]

(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention is constructed such that a water chamber cylinder is watertightly coupled to an outer surface of a floating tube plate so that the floating tube plate is adjacent to the flange of the main body cylinder together with the water chamber cylinder. The inner surface of the floating tube is slidable, and a flexible joint means is detachably provided between the flange of the body barrel and the floating tube plate so that the vicinity of the sliding surface of the floating tube plate is a closed area. It is characterized by.

(Operation) During the operation of the multi-tube heat exchanger, the heated fluid is introduced into the main body cylinder and the heated fluid is introduced into the one water chamber cylinder. The fluid to be heated is heated by the heating fluid while flowing in the heat transfer tube and being introduced into the other water chamber body. At this time, a temperature difference occurs between the main body cylinder and the heat transfer tube, and the floating tube plate moves while sliding on the inner surface of the main body cylinder due to the difference in thermal expansion between the main body cylinder and the heat transfer tube.

The displacement between the body tube and the body tube caused by the movement of the floating tube sheet is transmitted to the joint means provided between the edge of the body tube and the outer surface of the floating tube sheet. Therefore, the displacement is absorbed there. During this time, the heating-side fluid leaks outward from the gap between the inner surface of the body barrel and the outer circumference of the floating tube sheet.However, fluid leakage is prevented by installing the joint means in a highly airtight manner. It

Embodiment Hereinafter, the present invention will be described in more detail with reference to FIG. 1, which is a preferred embodiment.

In FIG. 1, reference numeral 11 indicates a main body cylinder, and a flange portion 12 is integrally provided at an edge of the main body cylinder 11. In addition, a floating tube plate 13 located in front of the flange portion 12 is provided in the body case 11 so as to be slidable in the axial direction. A water chamber barrel 14 is watertightly attached to the outer surface of the floating tube plate 13 by welding, and operates in accordance with the forward / backward movement of the floating tube plate 13.

On the other hand, the region extending outside the floating tube plate 13 is covered with a joint means, for example, a bellows 15 that freely expands and contracts in the axial direction, and sufficient airtightness is maintained. That is, the bellows 15 of this embodiment has one end attached to the body side flange 16 and the other end to the tube sheet side flange 17 by welding in an airtight manner.

Reference numeral 18 denotes a heat transfer tube having one end supported by the floating tube plate 13 and the other end supported by a fixed tube plate (not shown). Further, reference numerals 19 and 20 are seat packings, and reference numerals 21 and 22 are hexagon bolts, respectively.

Next, the operation of the above configuration will be described.

The fluid on the heating side is inside the main body 11, while the fluid on the heated side is inside the water chamber
When each is introduced into 14, the main body 11 is heated and the temperature rises. At this time, on the heat transfer tube 18 side, the temperature rise is smaller than that of the main body cylinder 11 because the fluid to be heated flows inside.
Due to the difference in temperature rise and the difference in constituent materials, the floating tube plate
13 moves while sliding on the inner surface of the main body 11. This amount of movement is transmitted to the bellows 15 via the tube plate side flange 17.
Although the bellows 15 causes a displacement equal to this movement amount, the bellows 15 itself manufactured by bending a thin plate does not restrict the movement of the floating tube sheet 13 because the bellows 15 itself deforms. Also, a floating tube plate
The fluid leaked from the gap between the outer circumference of 13 and the body cylinder 11 is a bellows.
It flows into the inside, but the trunk side flange 16 and the tube plate side flange
Since 17 is pressed against the flange portion 12 and the floating tube plate 13 via the sheet packings 19 and 20, it does not flow out to the outside.

Since the bellows 15 of the above-described embodiment is a metal having high strength, it does not deteriorate over time as compared with a rubber O-ring, and is easily damaged even if the floating tube plate 13 repeatedly expands and contracts. Absent. Also, since the bellows 15, the body side flange 16 and the tube plate side flange 17 are visible from the outside, it is easy to inspect locations where there is a risk of impairing the sealing function, and to repair if an abnormality is found. Is.

Further, as another effect, when it becomes necessary to pull out the tube bundle when replacing the heat transfer tubes 18 and the like, the tube bundle can be easily pulled out by removing the hexagon bolt 22.

Moreover, it is easy to change the shape of the bellows 15 according to the amount of expansion and contraction, and even if the usage conditions change, the bellows 15 and the accompanying body side flange 16 and tube plate side flange 17 must be replaced. Can be dealt with easily.

[Effect of device]

As is apparent from the above description, the present invention is configured such that the floating tube plate can slide together with the water chamber barrel on the inner surface adjacent to the flange of the main body barrel, and the vicinity of the sliding surface of the floating tube plate is a sealed area. Since the expandable joint means is detachably installed between the flange of the body barrel and the floating tube plate, the good sealing function of the floating tube plate is maintained even when used for a long time, and the heating fluid It is possible to eliminate accidents such as that mixed in the fluid to be heated.

Moreover, since the joint means can be attached and detached, it is easy to carry out inspections and repairs from the outside, and it is possible to maintain the safety of high-temperature heat equipment.

[Brief description of drawings]

FIG. 1 is a sectional view showing an essential part of a multitubular heat exchanger according to the present invention, FIG. 2 is a configuration diagram showing a conventional multitubular heat exchanger, and FIG.
FIG. 4 is a configuration diagram showing an example of a conventional multi-tube heat exchanger having a floating tube plate, and FIG. 4 is a sectional view showing details of a floating tube plate mounting portion. 11 …… Main body cylinder, 13 …… Floating tube plate 14 …… Water chamber cylinder, 15 …… Bellows 16 …… Cylinder side flange, 17 …… Tube plate side flange 18 …… Heat transfer tube, 19,20 …… Seat packing

Claims (2)

[Scope of utility model registration request] 1. A multi-tube heat exchanger having a floating tube plate that freely slides along the inner surface of a cylindrical main body cylinder, wherein a water chamber cylinder is watertightly coupled to the outer surface of the floating tube plate. The floating tube plate is configured to be slidable on the inner surface adjacent to the flange of the main body cylinder together with the water chamber barrel, and a joint means that is expandable and contractable so that the vicinity of the sliding surface of the floating tube sheet is a sealed area. A multi-tube heat exchanger, which is detachably provided between the flange of the main body barrel and the floating tube plate. 2. The bellows, wherein the joint means is mounted between a body side flange connected to a flange portion of the main body body and a tube plate side flange connected to an outer surface of the floating tube plate. A multi-tube heat exchanger according to claim 1, characterized in that the utility model is registered.