JPH0451324Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an improvement of a vertical shell-and-tube heat exchanger preferably used in absorption heat pumps, refrigerators, and the like.

(Prior Art) FIG. 6 shows an example of this type of heat exchanger. As shown in the figure, each heat exchanger tube 1 is housed in a shell 2, and its upper and lower ends are connected to an upper tube plate 3. When the heat exchanger tube is fixed to the lower tube plate 4 and is relatively long, a support plate 5 is provided as an intermediate support to prevent vibration, and the heat exchanger tube is installed through a hole formed in the support plate. ing. A mild steel plate is generally used as this support plate, and when a bare tube is used as the heat exchanger tube, holes with a diameter larger than the outside diameter of the heat exchanger tube are formed in the support plate to allow the liquid to pass along the outer periphery of the heat exchanger tube. 5 was formed. However, in the case of heat exchanger tubes made of finch tubes, there were drawbacks as described below.

(Problem to be solved by the invention) For example, when a finch tube equipped with copper fins is used as a heat transfer tube, the fin portion easily deforms due to contact between the inner periphery of the hole in the support plate and the fin. There was a problem in that the heat tube could not be held securely and it became impossible to prevent vibration of the heat exchanger tube.

The purpose of the present invention is to solve the above problems, and therefore provide a heat exchanger with a structure that allows liquid to flow down along the outer periphery of the heat exchanger tubes and prevents vibrations of the heat exchanger tubes. That's true.

(Means for Solving the Problems) The present invention is characterized in that, in a vertical shell-and-tube heat exchanger, a cylindrical rubber bushing is provided between a hole in a support plate serving as an intermediate support and a heat transfer tube 1 consisting of a finch tube. 20 interposed therebetween, a rubber bushing having a discontinuous portion at one point around the circumference is fixed to the heat exchanger tube with a spring ring 24, and a recess 25 for a liquid reservoir is formed on the upper surface of the rubber bushing.
It has a groove 21 for liquid passage on the inner periphery.

(Operation of the means for solving the problem) The heat exchanger tube 1 of this heat exchanger is held by the support plate 5 via the rubber bushing 20 at an intermediate position, so vibration is prevented, and vibrations are prevented from being transmitted through the outer surface of the heat exchanger tube. The flowing down heat exchange liquid is collected in the recess 25 on the rubber bushing, and because it passes through the groove 21 on the inner surface of the rubber bushing without overflowing to the outside, the liquid contacts the heat transfer tube in a suitable manner.
The heat exchange action inside and outside the heat exchanger tube is suitably performed.

(Example) FIG. 1 shows an example of a heat exchanger according to the present invention. As shown in the figure, the heat exchanger tube 1 and the shell body 2 are installed vertically, and the upper end of the heat exchanger tube consisting of a finch tube is It is fixed to the tube sheet 3 and its lower end is fixed to the lower tube sheet 4. A support plate 5 is provided between the upper and lower tube sheets 3 and 4, and the intermediate position of the heat exchanger tubes is held down by the support plate 5. Above the upper tube plate 3 is an upper fluid chamber 6, and below the lower tube plate 4 is a lower fluid chamber 7. 8 is an upper nozzle and 9 is a lower nozzle. The upper nozzle 8 is provided below the upper tube plate 3, and a dispersion liquid 10 is provided at that position to define a chamber 10a that temporarily stores the liquid introduced from the upper nozzle 8, and the heat transfer tube is connected to the dispersion plate. It passes through the hole.

In the heat exchanger according to the present invention, as shown in FIGS. 1 and 2, the heat transfer tubes 1 are attached to the holes 5a of the support plate 5 via cylindrical rubber bushes 20.
Note that the fins 11 of the heat exchanger tube 1 at the position where the rubber bushing 20 is provided are removed, and the rubber bushing 20 is directly attached to the outer periphery of the heat exchanger tube.

As shown in FIGS. 3 and 4, this rubber bushing 20 has grooves 21 formed on its inner peripheral surface that generally extend in the axial direction, and the grooves are preferably formed at equal intervals as shown. . Groove 2
Although the shape of groove 1 may be arbitrary, it is preferable that the cross section of groove 21 is arcuate. Further, there is a discontinuous portion 22 at one location around the rubber bush 20, and the discontinuous portion 22 is expanded and attached to the heat exchanger tube 1. A groove 23 extending in the circumferential direction is formed at approximately the middle of the outer periphery of the rubber bushing 20, and a spring ring, that is, a coil spring 24 formed in a circular shape is installed in the groove.
This prevents 0 from falling off.

Furthermore, a recess 25 is formed on the upper surface of the rubber bush 20 to temporarily store liquid. The outer shape of this recess is preferably circular and concentric with the rubber bushing 20 as shown.

The fluid in the upper fluid chamber 6 flows inside the heat transfer tube 1, while the liquid such as a solution or a refrigerant liquid introduced from the upper nozzle 8 flows on the outer surface. That is, the liquid is introduced into the chamber 10a from the upper nozzle 8, flows down the outer surface of the heat exchanger tube 1 from the hole 10b of the distribution plate, and temporarily remains in the recess 25 on the upper surface of the rubber bushing at the position of the support plate 5, and the liquid is It is designed to prevent the water from overflowing to the outside. The liquid passes through the groove 21 of the rubber bushing from the recess 25, further travels through the heat transfer tube 1, reaches the lower part thereof, and flows out from the lower nozzle 9. If the liquid flowing on the outer surface of the heat transfer tube is a refrigerant liquid, the heat of the fluid flowing inside the tube causes heat transfer such as absorption, regeneration, evaporation, etc., and mass transfer.

(Effects of the invention) As described above, according to the invention, the heat exchanger tube is held on the intermediate support plate via the rubber bushing, so vibration is prevented, and the liquid flowing down the outer surface of the heat exchanger tube is transferred to the rubber bushing. Since the fluid passes through the groove at the position, the flow is not obstructed, and heat exchange between the fluid inside and outside the heat exchanger tube is performed appropriately. Therefore, it is preferable in terms of performance, has high reliability, and can maintain a long service life.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of an example of a heat exchanger according to the present invention, Fig. 2 is an enlarged sectional view of its main parts, Fig. 3 is a plan view of a rubber bushing used in the present invention, and Fig. 4 is the same as Fig. 3. 5 is a side view of the rubber bushing, and FIG. 6 is a schematic diagram showing a conventional heat exchanger. In the figure, 1... heat exchanger tube, 3... upper tube plate, 4...
Lower tube plate, 5...Support plate, 20...Rubber bushing, 21...Groove, 22...Discontinuous portion, 24...Spring ring, 25...Recessed portion.

Claims (1)

[Claims for Utility Model Registration] (1) A vertical shell-and-tube type in which a support plate is provided between an upper tube sheet and a lower tube sheet, and heat transfer tubes made of finch tubes are provided through holes in the support plate. In the heat exchanger, a cylindrical rubber bushing fixed to the heat transfer tube with a spring ring is fitted into the hole of the support plate, and the rubber bushing has a groove for liquid passage on the inner periphery and a hole at one point around the periphery. A heat exchanger characterized by having a continuous part and having a recessed part as a liquid reservoir formed on the upper surface thereof. (2) The heat exchanger according to claim 1, wherein the liquid passage grooves are provided at equal intervals on the inner circumference of the rubber bushing. (3) The heat exchanger according to claim 1, wherein the liquid passage groove is a groove having an arcuate cross section.