JPH0229425Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention relates to an in-line heat exchanger, particularly in a drainage pump driven by a diesel engine, in which engine cylinder cooling water is cooled by pump discharge water. This relates to in-line heat exchangers used in

(Prior Art) A schematic configuration of a conventional in-line heat exchanger of this kind is shown in FIGS. 3a and 3b.

That is, in each of these figures, the heat exchanger main body 1 has side flanges 4 in the longitudinal axis direction for the purpose of facilitating disassembly and assembly for internal cleaning etc.
It consists of a lower casing 2 and an upper casing 3, which are divided into upper and lower halves and are removably attached via 4.
The lower casing 2 and the upper casing 3 are provided with circumferential end flanges 5, 5 at both axial end portions of the lower casing 2 and the upper casing 3, which are connected to a drainage main pipe, which will be described later, when they are attached to each other.

A heat exchange chamber 6 having a flow path diameter, in other words, an inner diameter of the drainage main pipe, that is, a larger diameter than the inner diameter of the end flanges 5, 5, is formed inside the casing, and a heat exchange chamber 6 is formed inside the casing. The inlet side collecting pipe 7 and the outlet are arranged in a substantially semicircular arc shape facing in the circumferential direction so as to be located in the upper half of each of the inlet side and outlet side ends outside the flow path diameter that do not cause drainage flow path resistance. The side collecting pipes 8 are arranged facing each other, and an inlet pipe and an outlet pipe 1 are connected to each other from one of the lower ends thereof.
0 is fastened to the lower casing 2 and taken out to the outside, and a large number of heat transfer tubes 11 are connected between the two collecting tubes 7 and 8 so as to be parallel to the flow path.
are arranged in series, and an inspection window 12 is provided at a suitable position on the upper housing 3.

However, the conventional heat exchanger configured in this manner is used, for example, in a drainage facility shown in FIG. That is, this drainage facility uses a drainage pump C that is rotationally driven by a diesel engine A via a reducer B, and uses this drainage pump C to drain water flowing into a water tank D to the outside from a drainage main pipe E. This heat exchanger is arranged in the middle of the drainage main pipe E, and the inlet pipe 9 and outlet pipe 10 are connected to each cylinder of the diesel engine A. Circulation pipe F connected to the jacket
and an expansion tank G to this circulation pipe F.
A circulation pump H is interposed to cool the cylinders, and the heated cooling water is circulated and supplied to each heat transfer tube 11 by the circulation pump H, thereby cooling the cylinders again.

The drainage pumps used in this way are intended for drainage during typhoons and heavy rains, and this drainage generally contains dirt and garbage.
In order to prevent this from being deposited at the bottom of the channel in the heat exchanger body, the inner surface of the bottom of the channel is aligned with the inner surface of the bottom of the drain main channel, and the heat exchanger tubes etc. that perform heat exchange are Instead of placing it in the upper part, it is placed only in the upper half where there is no risk of dirt and debris accumulating. However, in the case of a configuration in which heat exchanger tubes, etc. that perform heat exchange are placed only in the upper half of the flow path within the heat exchanger, in order to obtain the desired heat exchange capacity, the heat exchanger tubes themselves must be In this configuration, the overall length of the heat exchanger body becomes unnecessarily long, making it larger, which causes various problems in terms of structure and use, and also causes problems with drainage pipes. This has the disadvantage that the distance between the mounting surfaces to the pipe becomes longer.

(Problem to be solved by this invention) The problem to be solved by this invention is to prevent the heat exchanger from becoming longer and larger when increasing the heat exchange capacity of the heat exchanger. At the same time, the problem of sedimentation of dirt, dust, etc. at the bottom of the flow path of the heat exchanger body is also avoided.

(Means for solving the problem) The technical means to be taken to solve the above problem is that the engine-driven drainage pump, in other words, is interposed in the drainage main pipe, and is installed outside the flow path diameter of the drainage main pipe. In an in-line heat exchanger in which a large number of heat transfer tubes parallel to the flow path are connected in communication between an inlet side collecting pipe and an outlet side collecting pipe in approximately the upper half of the inside of the heat exchange chamber, the heat exchanger is A cooling jacket is provided at the inner bottom of the exchange chamber with an inlet pipe taken out from the starting end and an outlet pipe taken out from the terminal end, and the upper surface of the cooling jacket is arranged concentrically and flush with the inner surface of the flow path bottom of the drainage main pipe. The outlet pipe is formed with a radius of curvature, the outlet pipe and the inlet side collecting pipe are connected, and each of the heat exchanger pipes and the cooling jacket are connected in series to form a heat exchange section.

(Example) Hereinafter, an example of the in-line heat exchanger according to the invention will be described in detail with reference to FIGS. 1 and 2.

In the embodiments shown in FIGS. 1 and 2, the same reference numerals as in the conventional example shown in FIGS. 3a and 2 indicate the same or equivalent parts. A cooling jacket 13 is provided as a part.

Therefore, the cooling jacket 13 is placed in a newly formed space on the inner bottom surface of the lower housing 2.
It is removably attached to the left and right edge plates 14, 14 in the flow path direction, and its upper surface shape is designed to prevent the drainage main from becoming a flow path resistance for the flowing wastewater, and from depositing sediment and debris. It is formed concentrically and with the same radius of curvature as the inner bottom surface of the channel bottom, and its internal space is divided by a partition plate 15 that is perpendicular to the channel direction P, and is oriented perpendicularly to the channel direction from the inlet side to the outlet side. A series of heat transfer channels 16 are formed in a zigzag shape, and from the starting and terminal ends of the heat transfer channels 16, an inlet pipe 17 and an outlet pipe 18 are taken out to the outside, and the outlet pipe 18 is connected to the inlet side collecting pipe 7.
The inlet pipe 17 and the outlet pipe 10 of the outlet side collecting pipe 8 are connected to the cylinder cooling system of the engine for driving the pump.

Therefore, in the case of the device configuration of this embodiment, the cylinder cooling water heated by cooling each cylinder of the engine first flows from the inlet pipe 17 to the cooling jacket 13.
The heat is introduced into the heat exchanger through the zigzag heat transfer flow path 16, which is perpendicular to the flow path direction from the inlet side, and gradually flows to the outlet side by reciprocating the flow path alternately. It is once cooled by heat exchange with the wastewater through the upper plate surface forming the bottom, and then the air is cooled from the outlet pipe 18 to the inlet pipe 9.
It reaches the inlet side collecting pipe 7 through the inlet side collecting pipe 7, and reciprocates between the outlet side collecting pipe 8 and the inlet side collecting pipe 7 while passing through about 2 to 4 heat transfer tubes 11 per pass from the inlet side collecting pipe 7, Here too, after receiving a sufficient cooling effect through heat exchange with the wastewater, the water goes to the outlet side collecting pipe 8 and returns to the expansion tank G from the outlet pipe 10.

In this way, in the device configuration of the embodiment, first, while flowing in the zigzag-shaped heat transfer channel 16 of the cooling jacket, the heated cylinder cooling water is overall cooled, and then the heat transfer tube 11 is heated. Since the cooling is performed in the same manner by reciprocating, the necessary and sufficient cooling effect can be obtained in a small space, and the device configuration can be made more compact.

Furthermore, since the heat transfer passages 16 of the cooling jacket 13 are formed in a series of zigzag shapes that are perpendicular to the flow path direction of the waste water and gradually move from the inlet side to the outlet side, cooling within the cooling jacket 13 can be effectively performed. In addition, the heat exchanger body is divided into a lower casing and an upper casing, and the cooling jacket is detachably attached to the lower casing, making it easy to disassemble and inspect each part.

Note that the heat transfer channel 1 in the cooling jacket 13
It goes without saying that 6 does not necessarily have to be formed as in the embodiment, and that various forms can be adopted.

(Effects of the invention) As detailed above, according to this invention, in an in-line heat exchanger that is interposed in the discharge piping of a drainage pump driven by an engine, that is, in the drainage main pipe, the upper half of the heat exchange chamber Conventionally, a cooling jacket is arranged at the inner bottom of the heat exchange chamber for each heat transfer tube arranged parallel to the flow path direction, and these are arranged in series to form a heat exchange section. The space that could not have been used for this purpose, that is, the bottom of the vessel, which was a dead space, can be effectively used as a heat exchange section. Therefore, the specified heat exchange efficiency can be obtained in a small space, and as a result, the relative In addition to making it possible to downsize the equipment configuration, it also shortens the distance between the mounting surfaces to the drain main, and because the top surface of the cooling jacket is formed concentrically and with the same radius of curvature as the inner surface of the bottom of the drain main channel. It has various practically useful features, such as no risk of increase in flow path resistance or sedimentation of dirt, etc., and a relatively simple mounting configuration that can be easily implemented.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing the general structure of an in-line heat exchanger according to an embodiment of this invention, Fig. 2 is an enlarged plan view showing the same cooling jacket taken out, and Fig. 3 a and b are according to the conventional example. FIG. 4 is a half-cut side view and a cross-sectional view showing the general structure of the in-line heat exchanger, and FIG. 4 is a block diagram showing the outline of a drainage pump device to which the in-line heat exchanger is applied. 1... Heat exchanger main body, 2 and 3... Lower and upper housing, 6... Heat exchange chamber, 7 and 8... Inlet side and outlet side collecting pipe, 9 and 17... Inlet piping, 10 and 18 ... Outlet piping, 11 ... Heat exchanger tube, 13 ... Cooling jacket, 15 ... Partition plate,
16...Heat transfer channel.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A flow path that is interposed in the drainage main pipe of a drainage pump driven by an engine, and that is located approximately in the upper half of the inside of the heat exchange chamber outside the flow path diameter of the drainage main pipe. In an in-line heat exchanger in which a large number of heat transfer tubes parallel to each other are connected in communication between an inlet side collecting pipe and an outlet side collecting pipe, the inlet pipe is connected from the starting end to the terminal end at the inner bottom of the heat exchange chamber. Cooling jackets are provided with outlet pipes taken out to the outside respectively, and the upper surface of the cooling jacket is formed concentrically and with the same radius of curvature as the inner surface of the flow path bottom of the drain main pipe, and the outlet pipes and the inlet side aggregate are arranged. 1. An in-line heat exchanger characterized in that a heat exchange section is constructed by connecting each of the heat transfer tubes and a cooling jacket in series. (2) A request for registration of a utility model characterized in that the inside of the cooling jacket is divided by partition plates to form a series of heat transfer channels, and the outlet side of the heat transfer channels is connected to the inlet side of each heat transfer tube. The in-line heat exchanger according to item 1. (3) The inside of the cooling jacket is divided by a partition plate so as to be perpendicular or parallel to the direction of the flow path to form a series of heat transfer paths in a zigzag shape from the inlet side to the outlet side. The in-line heat exchanger according to claim 2, wherein the outlet side of the heat exchanger tube is connected to the inlet side of each heat exchanger tube. (4) Claims 1 and 2 for utility model registration, characterized in that the heat exchanger main body is divided into a lower casing and an upper casing, and a cooling jacket is detachably attached to the lower casing. The in-line heat exchanger according to item 2 or 3.