JP2009264277A - Pump device with engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technology can reduce the cost of a pump device with an engine having a power generation mechanism. <P>SOLUTION: This pump device 20 with the engine includes a frame 21 being a base, a pump body 23 sucking and discharging water 22, the engine 24 as a driving source for driving the pump body 23, a muffler 25 as an exhaust pipe connected to this engine 24 and passing exhaust gas, a thermal power generation element 10 arranged on an outer peripheral surface 26 of the muffler 25 as this exhaust pipe and generating electric power by a temperature difference, and a cooling pipe 28 as a cooling part arranged in a spiral shape along an outside surface 27 of this thermal power generation element 10 and cooling the thermal power generation element 10 by high pressure water as a cooling medium generated by the pump body 23. As a result of this, since the thermal power generation element is arranged on an outer peripheral surface of the exhaust pipe, there is no need to apply a special thermal measure, and the pump device with the engine having the power generation mechanism can be reduced in the cost. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a pump device with an engine provided with a power generation mechanism.

Conventionally, a pump device with an engine provided with an alternator (alternator) as a power generation mechanism is known (for example, see Patent Document 1).
JP 2006-97501 A (FIGS. 2 and 3)

Patent document 1 is demonstrated based on the following figure.
FIG. 9 is a diagram for explaining the basic configuration of a conventional pump device with an engine. In the pump device with an engine 100 for sucking and discharging water, an operator pulls the recoil starter 101 to start the engine 102. Then, the water pump 103 driven by the engine 102 sucks water from the suction port 104 and discharges it from the discharge port 105.
The engine 102 drives an alternator 106 (see Patent Document 1, reference numeral 50 in FIG. 3) built in the engine 102. As a result, the alternator 106 can obtain an operating power supply.

  In the prior art, the alternator 106 is built in the engine 102, and the alternator 106 is exposed to a considerably high temperature when the engine 102 is in operation. For this reason, it is necessary to take measures against heat in the alternator 106, and expensive materials are used in order to achieve heat resistance specifications. As a result, the pump device 100 with the engine becomes expensive. That is, there is a demand for providing a technology that can reduce the cost of a pump device with an engine that includes a power generation mechanism.

  This invention makes it a subject to provide the technique which can reduce the cost of the pump apparatus with an engine provided with the electric power generation mechanism.

  The invention according to claim 1 is a pump apparatus with an engine provided with an engine as a drive source in a pump body so that a high-temperature conductor faces the exhaust pipe of the engine and a low-temperature conductor faces the cooling portion. In addition, a thermoelectric generator that generates electric power with a temperature difference is provided between the exhaust pipe and the cooling unit.

  The invention according to claim 2 is characterized in that the cooling section uses high-pressure water generated in the pump body as a cooling medium.

In the invention according to claim 1, power is generated by the thermoelectric generator using the heat of the exhaust gas and the temperature difference between the cooling parts. Since the thermoelectric generator is disposed on the outer peripheral surface of the exhaust pipe, it is not necessary to take special heat countermeasures. As a result, the cost of the engine-equipped pump device including the power generation mechanism can be reduced.
In addition, since the power is generated without using the driving force of the engine, the efficiency of the engine can be improved.
Furthermore, since it is possible to generate more power than is necessary for the operating power of the engine, for example, it is possible to generate power for lighting that is necessary during night work.

  In the invention according to claim 2, high-pressure water generated in the pump body is used as the cooling medium. Since new high-pressure water is always used, it is always possible to cool and maintain the temperature difference.

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.
FIG. 1 is a diagram for explaining the basic principle of a thermoelectric generator used in the present invention. A thermoelectric generator 10 as a power generation mechanism is provided on a high temperature conductor 11 provided on a high temperature side and on a low temperature side. The low-temperature conductors 12 and 12 are composed of an n-type thermoelectric semiconductor 13 and a p-type thermoelectric semiconductor 14 interposed between the high-temperature conductor 11 and the low-temperature conductor 12.

Next, the operation of the thermoelectric generator 10 will be described.
The high temperature conductor 11 is maintained at a high temperature when heat is supplied from a high temperature heat medium as indicated by an arrow (1). Further, the low temperature conductors 12 and 12 maintain the low temperature by radiating heat to the low temperature medium as indicated by arrows (2) and (2).
In this way, when a temperature difference is generated between the high temperature conductor 11 and the low temperature conductors 12 and 12, the Seebeck effect occurs.
According to the Seebeck effect, electrons 15 move in the n-type thermoelectric semiconductor 13 as indicated by an arrow (3), and holes 16 move in the p-type thermoelectric semiconductor 14 as indicated by an arrow (4). As a result, a current is generated as indicated by an arrow (5).

  As materials for n-type and p-type thermoelectric semiconductors, bismuth-tellurium compounds are suitable, but other thermoelectric materials such as lead-tellurium alloys, silicon-germanium alloys, cobalt-antimony compounds, and zinc-antimony compounds If so, the type does not matter.

  FIG. 2 is a diagram for explaining the appearance of the thermoelectric generator according to the present invention. The thermoelectric generator 10 includes a high-temperature conductor 11, a low-temperature conductor 12, and an n-type thermoelectric semiconductor sandwiched between the high-temperature conductor 11 and the low-temperature conductor 12. 13 and the p-type thermoelectric semiconductor 14 and has a plate shape as a whole.

  FIG. 3 is a perspective view of a pump device with an engine according to the present invention. The pump device with an engine 20 includes a frame 21 serving as a base, a pump main body 23 provided on the frame 21 for sucking and discharging water 22, and a frame. 21 provided on the engine 24 as a drive source for driving the pump body 23, a muffler 25 as an exhaust pipe connected to the engine 24 and through which exhaust gas passes, and an outer peripheral surface 26 of the muffler 25 as an exhaust pipe. A thermoelectric generator 10 that generates electric power with a temperature difference, and a cooling unit that is provided spirally along the outer surface 27 of the thermoelectric generator 10 and cools the thermoelectric generator 10 with high-pressure water as a cooling medium generated in the pump body 23 As a cooling pipe 28.

  Provided in the vicinity of the engine 24, 31 is a fuel tank for storing fuel to be supplied to the engine 24, and 32 is a throttle body cover.

The pump body 23 includes a suction port 34 that is fixed to a side portion of the pump body 23 with a bolt 33 and sucks water, and a suction hose 35 that is connected to the suction port 34 and that has one end in the water 22. A discharge port 37 that discharges the sucked water fixed as a high-pressure water by a bolt 36 to the upper part of the pump main body 23 and a discharge hose 38 that is connected to the discharge port 37 and guides the high-pressure water is provided.
The discharge port 37 is provided with a branch port 41, and a cooling pipe 28 is connected to the branch port 41.

FIG. 4 is a plan view of a pump device with an engine according to the present invention. The pump device with an engine 20 includes a recoil starter 42 on a side portion of an engine 24 as a drive source. The engine 24 is operated to start.
A cooling pipe 28 faces the outer surface 27 of the thermoelectric generator 10. As a result, heat dissipation is performed efficiently.

  FIG. 5 is a cross-sectional view taken along line 5-5 of FIG. 4, and the thermoelectric generators 10 and 10 are provided between the muffler 25 as an engine exhaust pipe and the cooling pipe 28 as a cooling unit. The high-temperature conductors 11 and 11 face the outer peripheral surface 26 of the muffler 25 as an exhaust pipe. The low-temperature conductors 12 and 12 face the cooling pipe 28 serving as a cooling unit.

  Reference numeral 43 denotes a fixed cover, which fixes the thermoelectric generator 10 to the muffler 25 as an exhaust pipe. Further, by providing the fixed cover 43, it is possible to efficiently dissipate heat from the outer surface 27 of the thermoelectric generator 10.

The operation of the engine-equipped pump device having the above configuration will be described below.
FIG. 6 is a diagram showing the flow of exhaust gas and high-pressure water.
(A) is a figure which shows the flow of the exhaust gas discharged | emitted from the engine 24, and when the engine 24 as a drive source is started, high temperature exhaust gas will be the muffler 25 as an exhaust pipe as shown by the arrow (6). Flow into.

  (B) is a figure which shows the flow of the high pressure water as a cooling medium, and water flows into the pump main body 23 from the inlet 34 as shown by the arrow (7). A part of the high-pressure water discharged from the pump body 23 to the discharge port 37 flows into the cooling pipe 28 as shown by an arrow (8).

  FIG. 7 is a diagram for explaining the flow of exhaust gas and high-pressure water in the exhaust pipe portion. As indicated by an arrow (9), high-temperature exhaust gas flows through the muffler 25 as an exhaust pipe. As a result, the inside of the muffler 25 as an exhaust pipe becomes high temperature.

On the other hand, the high-pressure water as the cooling medium flows through the cooling pipe 28 as the cooling part as indicated by the arrow (10). The cooling pipe 28 is wound around the muffler 25 as an exhaust pipe,
The high-pressure water travels around the muffler 25 as an exhaust pipe a plurality of times and is discharged to the outside as indicated by an arrow (11).

  Since the cooling pipe 28 is wound around the muffler 25 as an exhaust pipe, the outer surfaces 27 and 27 of the thermoelectric generators 10 and 10 can be cooled as a whole. In addition, since new water is sucked from the outside, the high-pressure water as the cooling medium is maintained at a low temperature. As a result, the outer surface 27 of the thermoelectric generator 10 becomes a low temperature.

  FIG. 8 is an enlarged view of the main part of FIG. 7. Since the heat transmitted from the exhaust gas is transmitted to the low temperature side, the heat is transmitted from the muffler 25 as the exhaust pipe to the high temperature conductor 11 as indicated by the arrow (12). As a result, the high temperature conductor 11 becomes high temperature.

  On the other hand, the low temperature conductor 12 radiates heat toward the cooling pipe 28 as a cooling part as indicated by an arrow (13). As a result, the low temperature conductor 12 becomes low temperature. That is, a temperature difference occurs between the high temperature conductor 11 side and the low temperature conductor 12 side of the thermoelectric generator 10. Then, as in the basic principle described with reference to FIG. 1, electric current flows in the direction indicated by the arrow (14) to generate power.

The pump device with an engine according to the present invention is applied to a water pump in the embodiment, but can also be applied to a high-pressure washing machine and a power sprayer, and can be applied to a machine that drives a general pump with an engine. There is no problem.
In addition to supplying high-pressure water generated in the pump body, the cooling unit of claim 1 may supply cooling water such as tap water from the outside.
In the embodiment, the high-temperature conductor is exposed to the muffler, but may be exposed anywhere in the middle of the exhaust pipe.

  The pump device with an engine of the present invention is suitable for a water pump.

It is a figure explaining the basic principle of the thermoelectric power generation element used for this invention. It is a figure explaining the external appearance of the thermoelectric power generation element which concerns on this invention. It is a perspective view of the pump apparatus with an engine concerning the present invention. It is a top view of the pump apparatus with an engine concerning the present invention. FIG. 5 is a sectional view taken along line 5-5 of FIG. It is a figure which shows the flow of exhaust gas and high pressure water. It is a figure explaining the flow of the exhaust gas and high pressure water in an exhaust pipe part. It is a principal part enlarged view of FIG. It is a figure explaining the basic composition of the conventional pump device with an engine.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Thermoelectric power generation element (power generation mechanism), 11 ... High temperature conductor, 12 ... Low temperature conductor, 20 ... Pump apparatus with an engine, 23 ... Pump main body, 24 ... Engine (drive source), 25 ... Muffler (exhaust pipe), 28 ... Cooling piping (cooling part).

Claims (2)

In a pump device with an engine having an engine as a drive source in the pump body,
The engine exhaust pipe has a high-temperature conductor facing it and a cooling conductor facing the low-temperature conductor, and is provided with a thermoelectric generator that generates power with a temperature difference between the exhaust pipe and the cooling section. A pump device with an engine.   The pump device with an engine according to claim 1, wherein the cooling unit uses high-pressure water generated in the pump body as a cooling medium.

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