JPH0443729Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention uses a pump to cool the driving source of a diesel engine or other large pump equipment used to pump urban wastewater or rainwater drainage. This invention relates to a water pipe cooler that is cooled by pumped or discharged water itself.

(Prior Art) In recent years, a cooling device as shown in the system diagram of FIG. 6 has been used as a device for cooling a driving source such as a diesel engine of a large pump facility of a drainage pump station for urban drainage, rainwater drainage, etc. In FIG. 6, the driving rotation of the diesel engine 1 is reduced by a speed reducer 2, thereby driving a pump 3 to rotate. This pump 3 pumps rainwater and the like from a pump suction water tank 4 through a lift pipe 5 and discharges the rainwater and the like to a flow pipe 8 which is a discharge pipe in which a cooler 6 and a discharge valve 7 are interposed. The cooler 6 is provided with a cooling pipe 6a, one end of which is connected to a tank 9 through a conduit, and the other end is connected to a tank 9 through another conduit to cool the diesel engine 1. It is connected to one end of a cooling pipe 1a for cooling. This cooling pipe 1a
The other end is connected to the discharge port of the cooling water pump 10 through a conduit, and the suction port of the cooling water pump 10 is connected to the tank 9 through the conduit. In addition, 11 is a water tank, and the pump 1 is connected to the water tank 11 from the water tank 11.
At step 2, the tank 9 is replenished with cooling water.

Such a cooling device uses the low temperature of the flowing water itself discharged from the pump 3 to cool the diesel engine 1.
It is extremely economical because it cools the cooling water that has been heated by the system.

Incidentally, urban wastewater, rainwater drainage, etc. contain not only sand and pebbles but also garbage such as pieces of vinyl and cloth. For this purpose, the cooling pipe 6a of the cooler 6
It is necessary to prevent dust from getting caught in the cooling pipes 6a and to prevent the flow of water from being obstructed, and also to prevent damage to the cooling pipes 6a. Therefore, as a device to protect the cooling pipe 6a from large debris, the
The technology shown in this issue has been proposed. This special public show
The one shown in No. 58-47637 is equipped with a screen to remove large debris from running water.

(Problems to be solved by the invention) The technology shown in the above-mentioned Japanese Patent Publication No. 58-47637 is
Since large dust and the like are removed by the screen, there is no chance of dust getting caught in the cooling pipe 6a.
However, if the screen becomes clogged with dust or the like, there is a risk that the amount of flow necessary for cooling will not flow through the cooling pipe 6a, resulting in a decrease in cooling capacity. Further, since the screen is provided, the structure is complicated and the cooler 6 becomes longer in the flow direction. Particularly in urban areas where land prices are high and land is scarce, the large installation space for the cooler 6 is a serious problem.

The purpose of this invention was to solve the above-mentioned problems of the conventional flow tube type cooler.It has a simple structure that prevents dirt from getting caught in the cooling tube, and that allows cooling in the flow direction. An object of the present invention is to provide a water tube type cooler which can be shortened in length and can be easily assembled and disassembled.

(Means for Solving the Problem) In order to achieve the above object, the water tube cooler of the present invention is a water tube cooler installed in a water pipe such as a lift pipe or a discharge pipe of a pump. The inner diameter of the cooler body is made larger than the water flow pipe so that the flow area changes rapidly at the entrance and exit of the cooler body, and the cooler body is structured so that it can be divided into upper and lower parts, so that the inner diameter of the water flow pipe is larger than that of the water flow pipe. A coiled cooling pipe with a large inner diameter is fixed to a mounting member, and is further fixed in a removable manner within the cooler body with a tension bolt, and both ends of this cooling pipe are connected to conduits provided in the cooler body. The cooling pipes are connected to each other in a detachable manner using a loose flange, and are configured to allow cooling water to pass through the cooling pipe from the conduit.

(Function) A cooling pipe with a coiled inner diameter larger than the inner diameter of the water pipe is arranged inside the cooler body interposed in the water pipe, so that the water flowing from the water pipe into the cooler body flows through the coiled shape of the cooling pipe. There is no possibility that dirt, etc. that pass through the center of the cooling pipe and get mixed into the running water get caught in the cooling pipe. Since the flow path area changes rapidly at the entrance and exit of the cooler body, the pressure acting on the flowing water changes rapidly near the entrance and exit of the cooler body.
Sand and the like that tend to accumulate at the bottom of the cooler body can be sucked toward the center of the coiled cooling pipe, and the sand and the like can be discharged from the cooler body together with running water.

In addition, the coil diameter of the cooling pipe is large, the transmission area is large, and the flowing water comes into direct contact with the cooling pipe, so
Heat exchange is efficient. Furthermore, since the cooler body has a structure that can be divided into upper and lower parts, and the cooling pipes can be attached and detached, assembly and disassembly operations are easy.

(Description of Embodiments) Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 5. FIG. 1 is a side sectional view of an embodiment of the water tube cooler of the present invention, and FIG.
FIG. 3 is a cross-sectional view taken along the line A-A in FIG. 1, FIG. 3 is a diagram showing the fixed structure of the cooling pipe, FIG. FIG. 5 is a diagram schematically showing the flow of water in the water tube type cooler of the present invention.

In the figure, a water tube type cooler 20 has first and second coil-shaped cooling tubes 22 and 23 having different diameters arranged coaxially within a cooler body 21. This cooler body 21 is interposed between water pipes 24, 24. The inner diameter D1 of the cooler body 21 is the same as that of the water flow pipe 2.
The inner diameter D3 of the coil of the second cooling pipe 23, which has a smaller diameter, is larger than the inner diameter D2 of the water flow pipe 24. The cooler body 21 is configured to be vertically divisible, and sand discharge pipes 25, 25 are provided at the bottom thereof, slightly downstream of the inlet and slightly upstream of the outlet, respectively. Coiled first and second cooling pipes 2
The fixing structure of 2 and 23 is a mounting member 2 having a U-shaped cross section.
6, 26, . Further, tension bolts 28, 28... are arranged at both ends of the mounting members 26, 26... so as to be able to move forward and backward in the flow direction, and these tension bolts 28 are attached to the side walls 21a, 21a on both sides of the cooler body 21. , 28... by strongly abutting the mounting members 26, 2.
6... are fixed to the cooler body 21. Furthermore, both ends 22a, 23a of the first and second cooling pipes 22, 23
... is the conduit 3 by loose flanges 29, 29...
Connected to 0, 30... In addition, in Fig. 4, 31 is a seal ring, 32 is a packing,
A connecting pipe 33 connects the loose flange 29 and the cooler body 21.

In this configuration, since the inner diameter D3 of the second cooling pipe 23 is formed larger than the inner diameter D2 of the water flow pipes 24, 24, the flow from the water flow pipe 24 to the cooler body 21 is
The fluid flowing into the second cooling pipe 23 flows through the second cooling pipe 23 as a side wall of the flow path, and mainly flows through the center thereof without being hindered by the second cooling pipe 23 .
Therefore, there is no possibility that dirt or the like mixed into the fluid gets caught in the first and second cooling pipes 22 and 23. Note that the tighter the pitch of the coils of the first and second cooling pipes 22, 23, the more they function as side walls of the flow path, and the more dust and the like are trapped between the first and second cooling pipes 22, 23.
You'll be even less likely to get caught. Furthermore, since the coiled diameters of the first and second cooling pipes 22 and 23 are large, the heat transfer area increases accordingly, and the length of the particle tube cooler 20 in the flow direction can be shortened.

Furthermore, as shown in FIG. 5, the flow area of the fluid flowing into the cooler body 21 from the water flow pipe 24 suddenly increases at the inlet of the cooler body 21, and a portion of the fluid collides with the second cooling pipe 23. Later, a part of it is transferred to the second cooling pipe 2.
3 and the coil pitch of the first cooling pipe 22 toward the circumferential inner wall of the cooler body 21, and after colliding with the circumferential inner wall of the cooler body 21, the flow is divided into the upstream side and the downstream side, and is cooled. It joins the main stream at the inlet and outlet of the vessel body 21. Therefore, the first
A flow rate sufficient to cool the second cooling pipes 22 and 23 flows. Furthermore, the flow that joins the main stream from near the circumferential inner wall of the cooler body 21 at the inlet and outlet allows sand, etc. that would otherwise stay at the bottom of the cooler body 21 to be swept away without settling, and is used for water pipe cooling along with the mainstream. It can be discharged from the container 20. According to experiments, the flow velocity inside the cooler body 21 is 0.3 m/s.
If the relationship is above, the relationship between the inner diameter D1 of the cooler body 21 and the inner diameter D2 of the water flow pipe 24 is such that sand and the like can be sufficiently discharged if D2/D1 is 0.56 or more. The flow rate flowing through the cooler body 21 decreases, and the flow velocity increases.
If the velocity is less than 0.3 m/s, sand and the like will not be sufficiently discharged and will remain at the bottom of the cooler body 21. In such a case, when the pump 3 is stopped, valves (not shown) connected to the sand discharge pipes 25, 25 should be opened for an appropriate period of time to discharge sand, etc. along with the drain water. Good.

In addition, both ends 22a, 23a of the first and second cooling pipes 22, 23 are connected to the conduit pipes 30, 30... by loose flanges 29, 29..., so that the first and second cooling pipes due to thermal expansion 22 and 23 can be sufficiently absorbed. Furthermore, the first and second
The cooling pipes 22, 23 are connected to the mounting members 26, 26...
The one integrated with bolts 27, 27... is fixed to the cooler body 21 in a detachable manner by tension bolts 28, 28...
a, 23a are removably connected to the conduits 30, 30... with loose flanges 29, 29..., so it is easy to divide the cooler body 21 into upper and lower parts and easily connect the first and second cooling pipes 22, 23. can be installed and removed. Therefore, the water pipe cooler 2
Assembly work during production and disassembly work during inspection and repair are easy.

In the above embodiment, the first and second coiled cooling pipes 22 and 23 are coaxially arranged in a double layer in the flowing water tube type cooler 20, but the cooling pipe may be arranged in a single layer. Furthermore, the first and second cooling pipes 22 and 23 may be arranged in series in the flow direction. Here, in the case where two or more cooling pipes are provided as in the above embodiment, valves, etc. are provided at both ends of the cooling pipes, and these valves, etc. are operated as appropriate. The cooling water may be passed through the cooling pipe either in series or in parallel. moreover,
If one cooling pipe is damaged, the valve may be closed to prevent cooling water from flowing into that cooling pipe, and the cooling system may be operated by allowing cooling water to pass through other cooling pipes. Of course.

(Effects of the invention) As explained above, according to the water tube type cooler according to the present invention, a cooling pipe having a coiled inner diameter larger than the inner diameter of the water pipe is installed in the cooler body interposed in the water pipe. Because of this arrangement, the water flowing from the water pipe into the cooler body passes through the coil-shaped center of the cooling pipe, and there is no possibility that dirt or the like mixed into the water will get caught in the cooling pipe. In addition, since the flow path area changes rapidly at the entrance and exit of the cooler body, the pressure acting on the flowing water changes rapidly near the entrance and exit of the cooler body, which tends to accumulate at the bottom of the cooler body. By sucking sand, etc. toward the center of the coiled cooling pipe,
Sand, etc. can be discharged from the cooler body along with running water. Furthermore, since the coil diameter of the cooling pipe is large and the transmission area is large, the length of the cooling pipe in the flow direction can be shortened, and the length of the entire flow tube type cooler can be shortened in the flow direction. Furthermore, the assembly and disassembly of the cooler body and cooling pipes is easy, and the removal work and maintenance inspection when removing dust, sand, etc. that accumulate in the cooler body are easy, and it has excellent practical effects. play.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of one embodiment of the water tube type cooler of the present invention, FIG. 2 is a sectional view taken along line A-A in FIG. 1, and FIG. Fig. 4 is a diagram showing the structure of a loose flange that absorbs expansion and contraction of the cooling pipe, and Fig. 5 is a diagram schematically showing the flow of water in the water pipe cooler of the present invention. FIG. 6 is a system diagram of a cooling device for cooling a drive source of a conventionally used large pump facility. 20... Water tube type cooler, 21... Cooler body,
22...first cooling pipe, 23...second cooling pipe,
24...Water pipe, 26...Mounting member, 27...U
Bolt, 28... Tension bolt, 29... Loose flange, 30... Conduit, D1... Inner diameter of the cooler body, D2... Inner diameter of the water pipe, D3... Inner diameter of the coil of the second cooling pipe.

Claims (1)

[Scope of utility model registration request] In a water pipe type cooler installed in a water pipe such as a lift pipe or a discharge pipe of a pump, the inner diameter of the cooler body is made larger than the water pipe, and the flow path area changes rapidly at the entrance and exit of the cooler body. In addition, the cooler body has a structure that can be divided into upper and lower parts, and a cooling pipe having a coiled inner diameter larger than the inner diameter of the water flow pipe is fixed to a mounting member, and is further attached to the inside of the cooler body with a tension bolt. The cooling pipe is removably fixed, and both ends of the cooling pipe are removably connected to a conduit provided in the cooler body by loose flanges, and the cooling water is passed through the cooling pipe from the conduit. A water pipe cooler featuring: