JPH039400B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an in-line pump used in a drainage pump etc. mainly driven by a diesel engine to cool the cylinder cooling water of the engine with the water discharged from the pump. It relates to heat exchangers.

(Prior art) This type of conventional in-line heat exchanger is
It has a schematic configuration as shown in FIG. 7 and FIG. That is, the heat exchanger main body 1 includes a lower housing 2 and an upper housing 3, which are divided into upper and lower halves for the purpose of assembly and disassembly for internal cleaning and maintenance inspection after installation. Both the casings 2 and 3 are provided with circumferential end flanges 5 and 5 at both axial end portions of the casings 2 and 3, which are connected to the drainage main pipe when they are attached to each other.

The flow path diameter, in other words, the inner diameter of the drainage main pipe, or the end flange 5, is provided inside the housings 2 and 3.
A heat exchange chamber 6 having a larger diameter than the inner diameter of the heat exchange chamber 5 is formed, and inside the heat exchange chamber 6, at the inlet side end and outlet side end outside the flow path diameter that does not create flow path resistance for drainage water. , an inlet side collecting pipe 7 and an outlet side collecting pipe 8, each of which has a substantially semicircular arc shape, are arranged to face each other. Further, the inlet pipe 9 is taken out from the lower end of one side of the inlet side collecting pipe 7, and the outlet pipe 10 is taken out from the other lower end of the outlet side collecting pipe 8, and both of these sets are taken out from the lower housing 2. A large number of heat transfer tubes 1 are arranged between the tubes 7 and 8 in parallel to the flow path.
1 are connected in communication, and an inspection window 12 is further provided at a suitable location on the upper housing 3.

The in-line heat exchanger configured as described above is used, for example, in a drainage facility as shown in FIG. That is, this drainage facility uses a drainage pump C that is rotationally driven by a diesel engine A via a reduction gear B, and this drainage pump C pumps a water tank D.
Water inside the pump is drained to the outside through a main drainage pipe E, and this heat exchanger is disposed between the pump casing C' and the main drainage pipe E. Then, a circulation pipe F that communicates with the jacket surrounding each cylinder of the diesel engine A is connected to the inlet pipe 9 and the outlet pipe 10 of the heat exchanger, and the expansion tank G and the circulation pipe are connected to the circulation pipe F. A pump H is used to cool the cylinder and heat the cooling water to each heat transfer tube 1 by the circulation pump H.
1 is circulated and cooled again.

(Problems to be Solved by the Invention) However, the above-described in-line heat exchanger has had various problems in practical use or in its own structure. That is, in practical terms, a large number of heat exchanger tubes 11 are installed inside the housings 2 and 3 together with the collecting tubes 7 and 8, and when the heat exchanger tubes 11 and the like are to be maintained, inspected, replaced, or cleaned, the upper housing 3 This is done by removing the lower housing 2 from the lower housing 2, but if a ceiling wall etc. is close to the top of the heat exchanger, it is necessary to remove the upper housing 2 even if the housings 2 and 3 are split into two. Therefore, it is not possible to inspect, replace, or clean the heat exchanger tubes 11, etc.

Therefore, in order to avoid such a situation, it is necessary to devise a way to pull out heat transfer tubes horizontally in the direction of the flow path of the heat exchanger. After the heat exchanger is installed, the casing C' of the drainage pump and the operation part (or drive part) of the valve are installed close to each other on both sides of the heat exchanger in the direction of the flow path. cannot be pulled out horizontally.

On the other hand, in terms of structure, each heat exchanger tube 11 shown in FIG. 6 has a fitting 13 as shown in FIGS.
However, in this case, as shown in FIG. 10, since there is a partition plate 14 formed in the collecting pipe between two adjacent fittings 13, the fittings 13 It is necessary to set the interval p to be at least twice the wall thickness of the partition plate 14 from the assembly point of view, which inevitably increases the mounting pitch interval of each heat exchanger tube 11, making it difficult to increase the number of heat exchanger tubes 11 installed. This is a factor that causes a decline in heat exchange performance. Further, in this type of heat exchanger, a large number of heat exchanger tubes 11 are used;
The number of fittings 13 and fixing bolts 15 corresponding to the number of bolts 15 required increases significantly, and the number of internal threads corresponding to the number of bolts 15 must be machined on the collecting pipe 8. Since the fitting holes 13a and bolts 13b of the heat exchanger tubes 11 must be formed in the fittings 13 corresponding to the above, the number of processing steps increases and the cost becomes extremely high.

The present invention was made in view of these problems and to solve them, and allows each heat exchanger tube to be easily removed without disassembling the heat exchanger body, and also reduces the number of heat exchanger tubes. It is an object of the present invention to provide an in-line heat exchanger that can be installed at a low cost due to the number of parts, and that can increase the number of heat exchanger tubes that can be installed by reducing the interval between the installation pitches of the heat exchanger tubes as much as possible.

(Means for Solving the Problems) In order to achieve the above object, the in-line heat exchanger of the present invention includes, at each end of each heat exchanger tube,
It has a cylindrical shape and has an inner flange portion at one end for preventing slipping off with a diameter smaller than the outer diameter of the heat transfer tube, and a fitting having a sealing material is fitted on both the inner and outer circumferential surfaces, and this is A collecting pipe cover is disposed in the mounting holes formed on both ends of the casing located on both sides of the heat exchange chamber in the axial direction, and is fixed to the outer surface of both end walls of the casing to communicate with each of the heat exchanger tubes, and is attached to each of the fittings. The fittings are pressed and fixed by making contact with each other.

(Function) In the in-line heat exchanger configured as described above, when each heat exchanger tube is taken out for cleaning, inspection, parts replacement, etc., when the collecting tube covers attached to the outside of both end walls of the heat exchange chamber of the casing are removed, The fixation of the fixture that was press-fixed by the collecting pipe cover is released. Therefore, the heat exchanger tube can be pulled out horizontally together with the fitting, but in this case, if the fitting is pulled out, the mounting hole opens wide enough to accommodate the installation space of the fitting. It can be pulled out diagonally to the horizontal direction. Furthermore, in the assembled state, each heat transfer tube is prevented from coming off by the inner flange of the fixture that is pressed and fixed by the collecting tube cover.

(Example) Hereinafter, preferred examples of the present invention will be described in detail based on the drawings.

In FIGS. 1 to 3 showing one embodiment,
The casing 16 has an integral tubular shape without being divided into upper and lower halves, and the casing 16 includes:
Similar to the conventional one, circumferential end flanges 17 are provided at both ends in the axial direction of the pipe for connection to the drainage main pipe.
17 are provided. Also, this end flange 1
A horseshoe-shaped heat exchange chamber 18 is formed within the casing 16 and has a larger diameter than the inner diameter of the tubes 7 and 17, that is, the flow path diameter. Both end walls 19, 19 of this heat exchange chamber 18
As shown in FIG. 2, an arcuate attachment hole 20 and a circular attachment hole 21 are bored in the. and,
As shown in FIG. 3, a mounting plate 22 is mounted to the peripheral edge of the outer surface of the mounting holes 20, 21 by screws 23.

Reference numeral 24 denotes a fitting for the heat exchanger tube 11, which has a cylindrical shape with an inner diameter approximately equal to the outer diameter of the heat exchanger tube 11, and an inner flange portion 25 having a smaller diameter than the outer diameter of the heat exchanger tube 11 is formed at one end of the fitting. There are annular mounting grooves 2 on the surface and outer circumferential surface.
6 and 27 are formed, sealing members 28 and 29 consisting of O-rings are fitted into the mounting grooves 26 and 27, respectively, and both are fitted into the fitting holes of the mounting plate 22, and the mounting tool 24 is inserted into the assembly of the mounting plate 22. The inner flange 25 of the mounting tool 24 should not protrude beyond the cover mounting surface.
An appropriate gap is provided between the heat exchanger tube 11 and the tube end of the heat exchanger tube 11.

The collector pipe cover 31 that covers the end of each heat exchanger tube 11 in a communicating state has a semicircular cross section, and a flange plate 32 fixed by welding to both ends is attached to the mounting plate 22 with a screw 33. This brim-like plate 32 abuts against the fixture 24 and presses and fixes the fixture 24. The left and right collecting pipe covers 31 are connected to each other by a connecting pipe 34 at the upper part, and the collecting pipe covers 3
The internal space of 1 is divided at equal intervals by partition plates 35 to form a series of heat transfer channels in a zigzag shape gradually from the inlet side to the outlet side, and at the starting and terminal ends of the heat transfer channels, An inlet pipe 36 and an outlet pipe 37 are provided, and the inlet pipe 36 is used by connecting to the cylinder cooling system of the engine for driving the pump. Incidentally, the casing 16 is provided with an inspection window 38 at a suitable location, similar to the conventional one.

To explain the operation of the embodiment heat exchanger having the above structure, the fitting 24 and the heat transfer tube 11 are held liquid-tight by the sealing material 28 in the mounting groove 26 on the inner surface of the fitting 24, and the mounting The fitting 24 and the mounting plate 22 are held liquid-tight by the sealing material 29 in the mounting groove 27 on the outer surface of the fitting 24. and,
The inner flange 25 of the fixture 24 prevents the heat exchanger tube 11 from coming off, and the fixture 24 is fixed in contact with the flange plate 32 attached to the collecting pipe cover 31, so that the heat exchanger tube 11 and Mounting tool 24
Both are fixed without using screws as in the conventional case, and there are only screws 33 for fixing the collecting pipe cover 31 and screws 23 for fixing the mounting plate 22, which is different from the conventional one. The number of screws used can be significantly reduced compared to the previous method, and the number of man-hours required to process the female screws is also significantly reduced.

Moreover, when the heat exchanger tube 11 is taken out for maintenance, inspection, etc., the fitting 24 can also be easily taken out by removing the screw 33 and removing the collecting pipe cover 31. Therefore, a space corresponding to the mounting space of the fixture 24 is created and the degree of freedom in the drawing direction of the heat transfer tube 11 is increased, so that the heat transfer tube 11 can be drawn out diagonally as shown by the dashed line in FIG. This prevents the pump casing and valve drive unit installed nearby from colliding with each other and causing an obstruction, and the valve can be easily pulled out.

Furthermore, the fitting 24 is inserted into the fitting hole 30 of the mounting plate 22.
Since the fittings 24 are fitted inside and held flush with the mounting plate 22 and do not face the partition plate 35, there is no need to provide an extra gap between the fittings 24, and the mounting pitch of the heat exchanger tubes 11 can be adjusted. A large number of heat exchanger tubes 11 can be attached by making the tube as small as possible, and heat exchange efficiency can be improved.

FIG. 4 shows another embodiment of the present invention, in which the same or equivalent parts as in FIGS. 1 to 3 are given the same reference numerals. Therefore, this device has a configuration in which the mounting plate 22 is removed, a mounting hole 39 is formed in the end wall 19 of the heat exchange chamber 18 of the casing 16, and the mounting tool 24 is directly mounted in the mounting hole 39. This is different, and in addition to providing the same effects as the previous embodiment, there is an effect that the mounting plate 22 and the screws 23 for fixing it can be reduced.

(Effects of the Invention) As detailed above, according to the in-line heat exchanger of the present invention, the heat exchanger tubes can be pulled out in an oblique direction, so that the heat exchanger can be easily removed from the installed state during cleaning, maintenance inspection, or parts replacement. In addition, the heat exchanger tubes can be completely removed without removing any nearby pump casings or the like.

In addition, since the heat exchanger tube fittings can be fixed without using screws, the number of parts such as screws can be significantly reduced, and the number of man-hours required for processing female screws, etc., can be significantly reduced, resulting in significant cost reductions. can do.

In addition, the fittings are press-fixed to the collecting pipe cover, so they do not come into contact with the partition plate of the collecting pipe cover, and there is no need to provide extra gaps between the fittings, allowing the installation pitch of the heat transfer tubes to be adjusted as much as possible. It is possible to obtain a large heat exchange efficiency with a small size.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the in-line heat exchanger of the present invention, FIG. 1 is a half-cut front view showing a schematic configuration, FIG. 2 is a half-cut right side view, and FIG. 3 is a main part. FIG. 4 is a longitudinal sectional view of a main part of another embodiment of the present invention, and FIG. 5 is a configuration diagram showing an outline of a drainage pump device to which an in-line heat exchanger according to the present invention is applied. Figure 6 and below shows a conventional heat exchanger.
Fig. 6 is a half-cut front view showing the general configuration, Fig. 7 is a cutaway right side view, Fig. 8 is a front view of the fixture, Fig. 9 is a partially cutaway front view, and Fig. 10 is the same as Fig. 7. It is a partially enlarged view. 11... Heat exchanger tube, 16... Casing, 18...
...Heat exchange chamber, 19...End wall, 20, 21...Mounting hole, 22...Mounting plate, 23...Screw, 24...Mounting tool, 25...Inner flange, 26, 27...Mounting groove ,
28, 29...Sealing material, 31...Collecting pipe cover, 33...Screw.

Claims (1)

[Claims] 1 A large number of heat transfer tubes parallel to the flow path direction are arranged in a heat exchange chamber that is interposed in the discharge pipe of an engine-driven drainage pump and is provided in a casing and has a larger diameter than the flow path diameter of the discharge pipe. In the in-line heat exchanger, each end of each of the heat transfer tubes has a cylindrical shape, and one end thereof has an inner flange portion for preventing slippage, which has a smaller diameter than the outer diameter of the end of the heat transfer tube, and has an inner and an outer ring. Fittings having a sealing material are fitted onto both circumferential surfaces, and these are placed in mounting holes drilled in both end walls of the casing located on both sides of the heat exchange chamber in the axial direction; An in-line heat exchanger, characterized in that a collecting tube cover communicating with each of the heat transfer tubes is fixed to the outer surface of both end walls of the in-line type heat exchanger, and the fittings are pressed and fixed by being brought into contact with each of the fittings.