JPH08261200A - Reflux water-cooled engine pump - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a reflux-type water-cooled engine pump capable of effectively cooling a water-cooled engine at the time of pump shutoff operation at low speed operation at high suction. [Configuration] Water supply pump main body 1 and this water supply pump main body 1
The water-cooled engine 2 for driving the water-cooled engine 2 is used. This water is supplied to the engine-side cooling water passage portion 4b of the water-cooled engine 2, and after cooling the water-cooling engine 2, the water is passed through the return-side cooling water passage portion 4d.
The structure for returning the low pressure part to the water inlet 1d side. The water supply pump main body 1 is provided with a temperature operated valve mechanism 11 that discharges a part of the water in the water supply pump main body 1 to the outside when the temperature of the water in the water supply pump main body 1 rises above a predetermined temperature.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reflux type water-cooled engine pump suitable for use as, for example, an engine pump of a portable fire pump.

[0002]

2. Description of the Related Art In a water-cooled engine pump of a portable fire pump, water supplied as cooling water from a high-pressure portion of a water supply pump body to a cooling-water passage of the water-cooled engine is generally discharged outside after cooling the water-cooled engine. However, in such a structure, there is a problem that the road surface is flooded by the discharge of the cooling water.

For this reason, recently, after the cooling of the water-cooled engine, the cooling water is being returned to the suction port side of the low-pressure portion of the water supply pump body through the return-side cooling water passage portion. This type of water-cooled engine pump is called a recirculation type water-cooled engine pump.

FIG. 9 shows a schematic structure of a conventional reflux type water-cooled engine pump of this type. That is, in this reflux type water-cooled engine pump, as shown in the drawing, a water supply pump main body 1 that discharges water by rotating the pump impeller 1b in the pump casing 1a, and a water-cooled engine that drives the water supply pump main body 1. 2 and an engine body 3 including a cylinder 3a of the water-cooled engine 2.
High-pressure part 1c of water supply pump main body 1 as cooling water for cooling
Is supplied to the engine-side cooling water passage portion 4b of the water-cooled engine 2 through the supply-side cooling water passage portion 4a, and after cooling the water-cooling engine 2, the muffler-side cooling water passage portion 4c. After cooling the exhaust muffler 5, the exhaust muffler 5 is returned to the water inlet 1d side which is the low pressure part of the water supply pump body 1 through the return side cooling water passage 4d. Reference numeral 4e is a drain side cooling water passage portion extending from the lower portion of the engine side cooling water passage portion 4b to the drain cock 6a. The cooling water passage for the water-cooled engine 2 includes the supply-side cooling water passage portion 4a, the engine-side cooling water passage portion 4b, the muffler-side cooling water passage portion 4c, the return-side cooling water passage portion 4d, and the drain-side cooling water passage portion 4e. 4 are configured. Further, 6a is a drain cock provided at the bottom of the water supply pump body 1, 6b
Is a drainage cock provided in the lower part of the return side cooling water passage 4d, 8 is a water discharge valve provided in the upper part of the water supply pump main body 1, and 9 is a discharge port. The drain cocks 6a and 6b are
After the water supply pump main body 1 is operated, it is opened manually to discharge the cooling water.

[0005]

However, in such a conventional reflux type water-cooled engine pump, since the cooling water that has cooled the water-cooled engine 2 is returned to the water supply pump main body 1, the water supply pump main body 1 is When the water supply pump main body 1 is operated with the discharge port 9 closed, when the operation is continued for a long time, the temperature of the cooling water and the water in the water supply pump main body 1 gradually rises and the water cooling is performed. There was a problem that the engine 2 overheated and the water-cooled engine 2 burned.

An object of the present invention is to provide a pump shutoff operation,
It is to provide a reflux type water-cooled engine pump capable of effectively cooling a water-cooled engine.

Another object of the present invention is to provide a reflux type water-cooled engine pump capable of effectively cooling the water-cooled engine during the pump cutoff operation in the low speed operation at the time of high suction.

Another object of the present invention is to provide a reflux type water-cooled engine pump provided with a temperature actuated valve mechanism capable of operating the valve element at the temperature of the water in the water supply pump body.

Another object of the present invention is to provide a reflux type water-cooled engine pump provided with a temperature actuated valve mechanism capable of operating the valve element at the temperature of the pump casing.

[0010]

The present invention comprises a water supply pump main body and a water cooling engine for driving the water supply pump main body, and water supplied from a high pressure portion of the water supply pump main body is used as cooling water for the water cooling engine. The object of the improvement is a reflux-type water-cooled engine pump which is supplied to the cooling water passage of the water-cooled engine and is returned to the suction port side of the low-pressure portion of the water supply pump body after cooling the water-cooled engine.

According to the present invention, when the temperature of the water in the water supply pump body rises above a predetermined temperature, the valve body opens in the water supply pump body to discharge a part of the water in the water supply pump body to the outside. Provide a temperature operated valve mechanism.

In this case, as the temperature actuated valve mechanism, the fluid in the cylinder expands and contracts at the temperature of the water in the water supply pump body to drive the piston in the cylinder, and the valve element is operated by the drive of this piston. A structure having a thermo-piston mechanism can be used.

Further, as the temperature actuated valve mechanism, a structure having a shape memory spring for operating the valve element by expanding or contracting at the temperature of the water in the water supply pump body can be used.

Further, as the temperature actuated valve mechanism, a structure having a spring for urging the valve body in the direction of closing the valve hole can be used.

Further, in the present invention, when the temperature of the pump casing of the water supply pump main body rises above a predetermined temperature, the valve body opens in the water supply pump main body and a part of the water in the water supply pump main body is discharged to the outside. It is also possible to provide a temperature actuated valve mechanism that operates.

[0016]

As in the present invention, when the temperature of the water in the water supply pump body rises above a predetermined temperature, the valve body opens in the water supply pump body and a part of the water in the water supply pump body is discharged to the outside. By providing the temperature actuated valve mechanism that operates, when the temperature of the water in the water supply pump body rises to a predetermined temperature or higher, part of the water in the water supply pump body whose temperature has risen can be discharged to the outside. In this state, low-temperature water is supplied from the water inlet of the water supply pump main body into the water supply pump main body, the shortage of water in the water supply pump main body is replenished, and water and cooling water in the water supply pump main body are supplied. The temperature of the cooling water in the passage is reduced. Such an operation is repeated every time the temperature of the water in the water supply pump main body rises above a predetermined temperature.

Therefore, during the pump shutoff operation, the temperature of the water supplied from the water supply pump main body to the cooling water passage of the water cooling engine does not exceed the predetermined temperature, and the water cooling engine can be effectively cooled. Can be prevented from overheating or burning.

Here, the temperature actuated valve mechanism means a structure in which the temperature of an object such as water is detected and the valve body is opened when the temperature rises above a predetermined temperature.

In particular, when the temperature control valve mechanism is provided in the water supply pump main body as in the present invention, the water supply pump main body does not become negative pressure but positive pressure even during pump shut-down operation at low speed operation at high suction. Since the temperature of the water inside the water supply pump body rises during the pump shutoff operation and the valve of the temperature actuated valve mechanism opens, the positive pressure water pressure is used to ensure that high temperature water is discharged outside the water supply pump body. Can be discharged.

Further, as the temperature actuated valve mechanism, the fluid in the cylinder expands and contracts at the temperature of the water in the water supply pump body to drive the piston in the cylinder, and the thermostat for operating the valve body by driving the piston. If a structure having a piston mechanism is used, the temperature of water in the water supply pump body can be detected and the valve body can be easily operated.

Further, if the temperature actuated valve mechanism has a structure having a shape memory spring for operating the valve element by expanding or contracting at the temperature of water in the water supply pump main body, water in the water supply pump main body is used. The valve body can be easily operated by detecting the temperature of. Further, according to the shape memory spring, the temperature sensor also serves as the driving means, so that the structure of the temperature actuated valve mechanism can be simplified.

Further, if the temperature operated valve mechanism is provided with a spring for urging the valve body in the direction of closing the valve hole, the operation can be promptly performed when the valve body is closed.

Further, as in the present invention, when the temperature of the pump casing of the water supply pump body rises above a predetermined temperature, the valve body opens to part of the water in the water supply pump body outside the water supply pump body. If a temperature-operated valve mechanism for discharging the water is provided, the temperature of the pump casing is detected, and when the temperature rises above a predetermined temperature, a portion of the water in the water supply pump main body whose temperature has risen is discharged to the outside. You can

[0024]

Embodiments of the present invention will now be described in detail with reference to the drawings. The parts corresponding to those in FIG. 9 described above are designated by the same reference numerals.

FIG. 1 shows the configuration of a first embodiment of a reflux type water-cooled engine pump according to the present invention.

In the reflux type water-cooled engine pump of this embodiment, a drainage passage 10 is provided in the pump casing 1a of the feedwater pump main body 1, and the drainage passage 10 and the pump casing 1a have a boundary in which the inside of the feedwater pump main body 1 is provided. There is provided a temperature operated valve mechanism 11 for discharging a part of the water in the water supply pump body 1 to the outside through the drainage passage 10 when the temperature of the water rises above a predetermined temperature.

FIGS. 2 and 3 show a first embodiment of the temperature operated valve mechanism 11. The temperature actuated valve mechanism 11 of this embodiment has a tubular valve housing 12, a passage 13 in the valve housing 12 is partitioned by a valve seat 14, and a valve hole 15 is formed in the center of the valve seat 14. ing. A valve body 16 is provided in the passage 13 outside the valve seat 14 so as to close the valve hole 15. A seal body 17 is attached to the surface of the valve body 16 facing the valve seat 14. In addition, the passage 13 outside the valve seat 14 is urged so that the valve body 16 quickly contacts the valve seat 14 when the temperature of the water in the water supply pump body 1 returns to the allowable temperature range. A coil spring 18 is provided. The outer end of the coil spring 18 is in contact with a ring-shaped spring receiver 19 fitted and fixed to the inner circumference of the outer end of the passage 13. Coil spring 1
The inner end of 8 is in contact with the valve element 16. Inside the passage 13 inside the valve seat 14, the cylinder 2 is expanded and contracted by a fluid such as wax or liquid (not shown) in the cylinder 20.
Driving the piston 21 inserted in the valve body 0
A thermo-piston mechanism portion 22 for operating the is arranged. The thermo-piston mechanism 22 that contains wax as a working fluid in the cylinder 20 has
In O, it is called a wax thermostat. In the present embodiment, the outer diameter of the cylinder 20 is formed smaller than the inner diameter of the passage 13 so that the water in the water supply pump body 1 can flow. The tip of the cylinder 20 is in contact with the valve seat 14 by a cylindrical spacer 23. The spacer 23
Is abutted on the valve seat 14 concentrically with respect to the valve hole 15 and has a plurality of holes 24 so that water can flow in the circumferential direction.
Has been opened. A mounting ring 25 is supported on the outer circumference of the cylinder 20, and the mounting ring 25 is screwed to the inner circumference of the lower portion of the valve housing 12. The attachment ring 25 has a plurality of holes 2 to allow water to flow therethrough.
6 is open. A drain pipe 10a is screwed to the outer end of the valve housing 12. The drainage passage 10 in the drainage pipe 10a communicates with the passage 13 in the valve housing 12.

Next, the operation of the reflux type water-cooled engine pump provided with such a temperature operated valve mechanism 11 will be described.

At the time of pump shutoff operation, the water supply pump main body 1
When the temperature of the water inside rises above a predetermined temperature, fluid such as wax or liquid (not shown) in the cylinder 20 of the thermo-piston mechanism portion 22 of the temperature actuated valve mechanism 11 thermally expands at that temperature, causing the piston 21 to move upward. 2 is moved to the left side, and the movement of the piston 21 causes the valve body 16 to move to the coil spring 1
The valve seat 1 is moved against the pressing force of 8 as shown in FIG.
4, the valve hole 15 is opened, and a part of the temperature-increased water in the water supply pump main body 1 passes through the valve hole 15 and the drain passage 1
It is discharged from 0 to the outside.

In this state, low temperature water is replenished into the pump casing 1a from the water inlet 1d of the water supply pump main body 1 and the cooling water passages including the water in the water supply pump main body 1 and the cooling water passage portions 4a to 4e. The temperature of the cooling water in 4 is reduced. Such an operation is repeated every time the temperature of the water in the water supply pump body 1 rises above a predetermined temperature.
Therefore, the water-cooled engine can be effectively cooled during the pump shutoff operation.

When the temperature of the water in the water supply pump body 1 falls below a predetermined temperature, the fluid such as wax or liquid (not shown) in the cylinder 20 contracts, whereby the coil spring 1
8, the valve element 16 is pushed back and pressed against the valve seat 14 as shown in FIG. 2, the valve hole 15 is closed, and the discharge of water from the water supply pump body 1 is stopped.

FIGS. 4 and 5 show a second embodiment of the temperature actuated valve mechanism 11. The parts corresponding to the temperature actuated valve mechanism 11 shown in FIGS. 2 and 3 are designated by the same reference numerals.

The temperature actuated valve mechanism 11 of this embodiment has a tubular valve housing 12, and the valve housing 12
The inner passage 13 is partitioned by a valve seat 14, and a valve hole 15 is formed in the center of the valve seat 14. A valve body 16 is provided in the passage 13 inside the valve seat 14 so as to close the valve hole 15. A seal body 17 is attached to the surface of the valve body 16 facing the valve seat 14. In the passage 13 inside the valve seat 14, a shape memory spring 27 that urges the valve body 16 to press it against the valve seat 14 is provided. The shape memory spring 27 is given a shape memory so as to contract at a predetermined temperature. One end of the shape memory spring 27 has the passage 1
3 is fixed to the spring receiving body 19 fitted and fixed to the inner circumference of the inner end portion of the adhesive 3 by adhesion or the like. In the spring receiving body 19,
A plurality of water passage holes 19a are opened. The other end of the shape memory spring 27 is fixed to the valve body 16 by adhesion or the like. The valve body 16 and the spring receiving body 19 are urged so that the valve body 16 quickly contacts the valve seat 14 when the temperature of the water in the water supply pump body 1 returns to the allowable temperature range. A coil spring 18 is provided.

The inner end of the temperature actuated valve mechanism 11 having such a shape memory spring 27 is also screwed to the pump casing 1a, and the inner end of the passage 13 in the valve housing 12 communicates with the pump casing 1a. Has been done. A drain pipe 10a is screwed to the outer end of the valve housing 12. The drainage passage 10 in the drainage pipe 10a communicates with the passage 13 in the valve housing 12.

Next, the operation of the reflux type water-cooled engine pump provided with such a temperature operated valve mechanism 11 will be described.

At the time of pump shutoff operation, the water supply pump main body 1
When the temperature of the water inside rises above a predetermined temperature, the shape memory spring 27 of the temperature actuated valve mechanism 11 contracts at that temperature and the valve element 16 moves as shown in FIG. The hole 15 is opened, and a part of the temperature-increased water in the water supply pump body 1 is discharged from the drainage passage 10 to the outside through the valve hole 15.

In this state, as shown in FIG. 1, from the water inlet 1d of the water supply pump body 1 to the pump casing 1a.
Cooling water passage 4 is formed by replenishing low-temperature water therein and is formed of water and cooling water passage portions 4a to 4e in water supply pump main body 1.
The temperature of the cooling water inside is reduced. Such an operation is repeated every time the temperature of the water in the water supply pump body 1 rises above a predetermined temperature. Therefore, the water-cooled engine can be effectively cooled during the pump shutoff operation.

When the temperature of the water in the water supply pump main body 1 drops below a predetermined temperature, the contraction force of the shape memory spring 27 disappears, whereby the force of the coil spring 18 prevails and the valve element 16 is pushed out, as shown in FIG. As described above, the valve seat 15 is pressure-contacted, the valve hole 15 is closed, and the discharge of water in the water supply pump main body 1 is stopped.

FIGS. 6 and 7 show a third embodiment of the temperature actuated valve mechanism 11. The parts corresponding to the temperature actuated valve mechanism 11 shown in FIGS. 4 and 5 are designated by the same reference numerals.

The temperature actuated valve mechanism 11 of the present embodiment is an example using a shape memory spring 27 of a type that expands at a predetermined temperature. In this case, as shown in FIG.
A shape memory spring 27 is arranged so as to surround the valve body 16, one end of the shape memory spring 27 is fixed to the valve seat 14, and an operation plate 28 is fixed to the other end of the shape memory spring 27. The plate 28 is connected to the valve body 16 by a connecting rod 29. The operation plate 28 is provided with holes 30 through which water flows. In this case, when the temperature of the water in the water supply pump body 1 returns to the allowable temperature range, the valve body 16
Although not shown, a coil spring 18 for urging the valve so as to quickly contact the valve seat 14 is provided on the right side of the operation plate 28. In this case, the tip end of the coil spring 18 is in contact with the operation plate 28, and the other end of the coil spring 18 is supported by the pump casing 1a via a spring receiver (not shown).

With such a structure, when the temperature of the water in the water supply pump main body 1 reaches a predetermined temperature during the shutoff operation of the pump, the shape memory spring 27 expands as shown in FIG. 28 is moved to the right side in the figure, the valve plate 16 is also moved in the same direction via the connecting rod 29 by the movement of the operation plate 28, the valve hole 15 is opened, and the temperature of the water in the water supply pump body 1 is increased. A part is discharged from the drainage passage 10 to the outside through the valve hole 15.

In this state, in the same manner as described above, the water inlet 1d of the water supply pump body 1 is moved to the pump casing 1a.
Cooling water passage 4 is formed by replenishing low-temperature water therein and is formed of water and cooling water passage portions 4a to 4e in main body 1 of the water supply pump.
The temperature of the cooling water inside is reduced. Therefore, the water-cooled engine can be effectively cooled during the pump shutoff operation.

When the temperature of the water in the water supply pump main body 1 drops below a predetermined temperature, the extension force of the shape memory spring 27 disappears, whereby the force of the coil spring 18 (not shown) prevails and the valve body 16 is pushed out, so that FIG. As shown in FIG. 5, the valve seat 14 is pressed and contacted, the valve hole 15 is closed, and the discharge of water in the water supply pump main body 1 is stopped.

FIG. 8 shows a fourth embodiment of the temperature operated valve mechanism 11. The parts corresponding to the temperature actuated valve mechanism 11 shown in FIGS. 2 and 3 are designated by the same reference numerals.

In the water supply pump body 1 of this embodiment,
The pump casing 1a is provided with a casing projecting portion 1e projecting inside thereof.

On the other hand, in the temperature actuated valve mechanism 11 of this embodiment, the tubular valve housing 12 is screwed into the pump casing 1a as shown in the figure.
That is, the valve housing 12 is provided with a flange portion 12a on the outer end side thereof, and is screwed into the pump casing 1a such that the flange portion 12a is brought into contact with the outer surface of the pump casing 1a via the O-ring 31. It is rare, and its inner end side is projected into the pump casing 1a and fitted into the recess 32 of the casing projecting portion 1e via an O-ring 33a. A communication hole 34 that communicates with the inside of the pump casing 1a is provided in the valve housing 12 on the right side of the valve seat 14. Further, in the thermopiston mechanism portion 22 of the present embodiment, the cylinder 20 is brought into contact with the casing protruding portion 1e in the recess 32 of the casing protruding portion 1e, and operates at the temperature of the casing protruding portion 1e. There is. In this case, an O-ring 33b is also interposed between the cylinder 20 and the valve housing 12 as shown in the figure to prevent water from entering the recess 32. The drain pipe 10a may be connected to the flange portion 12a on the outer end side of the valve housing 12.

When the temperature of the pump casing 1a rises above a predetermined temperature during the pump shutoff operation, at that temperature, fluid such as wax or liquid (not shown) in the cylinder 20 of the thermopiston mechanism portion 22 of the temperature actuated valve mechanism 11 is discharged. Due to thermal expansion, the piston 21 is projected outward and moved,
Due to the movement of the piston 21, the valve body 16 is moved against the pressing force of the coil spring 18 and separated from the valve seat 14, and the valve hole 15
Is opened, and a part of the temperature-increased water in the water supply pump body 1 is discharged from the passage 13 through the valve hole 15 to the outside.

In this state, as described above, low-temperature water is supplied from the water inlet 1d of the water supply pump body 1 into the pump casing 1a, and the shortage of water in the water supply pump body 1 is replenished. At the same time, the temperatures of the water in the water supply pump main body 1 and the cooling water in the cooling water passage 4 are lowered. Therefore, the water-cooled engine can be effectively cooled during the pump shutoff operation.

When the temperature of the pump casing 1a falls below a predetermined temperature, the fluid such as wax and liquid (not shown) in the cylinder 20 contracts, thereby causing the coil spring 18 to move.
Force is pushed back and the valve element 16 is pushed back to make pressure contact with the valve seat 14, the valve hole 15 is closed, and the discharge of water in the water feed pump main body 1 is stopped.

The temperature operated valve mechanism 11 is connected to the cooling water passage 4
However, in this case, in the low speed operation at the time of high suction, the negative pressure of the water intake port 1d of the water supply pump body 1 to which the cooling water returns is large, so that the inside of the cooling water passage 4 is May become a negative pressure, the cooling water temperature rises during the pump shutoff operation, the high temperature cooling water is not discharged when the valve of the temperature actuated valve mechanism 11 is opened, and on the contrary, air is sucked in and the pump falls. This may cause a state, which is not preferable.

The main aspects of the present invention disclosed in this specification are as follows.

(1) A water supply pump main body and a water cooling engine for driving the water supply pump main body are provided, and water supplied from a high pressure part of the water supply pump main body is used as cooling water for the water cooling engine. In the reflux type water-cooled engine pump, which is supplied to the cooling water passage of the water-cooled engine and is returned to the suction port side of the low-pressure part of the water-supply pump main body after cooling the water-cooled engine, in the water supply pump main body, A temperature actuated valve mechanism is provided, which opens the valve body when the temperature of the pump casing of the water supply pump body rises above a predetermined temperature and discharges part of the water in the water supply pump body to the outside. Reflux water-cooled engine pump.

(2) In the temperature-operated valve mechanism, the fluid in the cylinder expands and contracts at the temperature of the pump casing to drive the piston in the cylinder, and the thermopiston operates the valve element by driving the piston. The reflux type water-cooled engine pump according to (1) above, which has a structure including a mechanical portion.

(3) In the above (1), the temperature actuated valve mechanism has a structure including a shape memory spring that expands or contracts at the temperature of the pump casing to operate the valve body. The described reflux type water-cooled engine pump.

(4) Any one of the above (1), (2) and (3), characterized in that the temperature actuated valve mechanism is provided with a spring for urging the valve body in the direction of closing the valve hole. The reflux type water-cooled engine pump according to any one of the above.

[0056]

As described above, according to the reflux type water-cooled engine pump of the present invention, the following excellent effects can be obtained.

In the present invention, when the temperature of the water in the water supply pump body rises above a predetermined temperature, the valve body opens in the water supply pump body and the temperature at which a part of the water in the water supply pump body is discharged to the outside. Since the actuating valve mechanism is provided, when the temperature of the water in the water supply pump body rises above a predetermined temperature, part of the water in the water supply pump body whose temperature has risen can be discharged to the outside. In this state, low-temperature water is supplied from the water inlet of the water supply pump main body into the pump casing, so that the shortage of water in the water supply pump main body is replenished and the water and cooling water in the water supply pump main body are replenished. Since the temperature of the cooling water in the passage is lowered, it is possible to effectively cool the water-cooled engine during the pump shutoff operation, and it is possible to prevent the water-cooled engine from overheating or burning.

In particular, when the temperature control valve mechanism is provided in the water supply pump main body as in the present invention, the inside of the water supply pump main body does not become negative pressure even at the time of pump shutoff operation at low speed operation at high suction. Since the pressure is increased, the temperature of the water in the water supply pump main body rises during the pump shutoff operation,
When the valve of the temperature operated valve mechanism is opened, the high temperature water in the water supply pump main body can be reliably discharged to the outside by positive water pressure.

Further, as the temperature actuated valve mechanism as in the present invention, the fluid in the cylinder is thermally expanded by the temperature of the water in the water supply pump body to drive the piston in the cylinder, and the piston rod is driven by this piston. If you use a structure with a thermopiston mechanism that operates the valve body via
The valve body can be easily driven by the temperature of the water in the water supply pump body.

Further, when the temperature actuated valve mechanism of the present invention has a structure including a shape memory spring for operating the valve element by expanding or contracting at the temperature of the water in the water supply pump main body, the water supply valve is used. The valve body can be easily operated by detecting the temperature of water in the pump body. Further, according to the shape memory spring, the temperature sensor also serves as the driving means, so that the structure of the temperature actuated valve mechanism can be simplified.

Further, when the temperature actuated valve mechanism is provided with a spring for urging the valve body in the direction of closing the valve hole, the operation can be promptly performed when the valve body is closed.

Further, in the present invention, when the temperature of the pump casing of the water supply pump body rises above a predetermined temperature, the valve body opens in the water supply pump body to discharge a part of the water in the water supply pump body to the outside. Since a temperature operated valve mechanism that
It is possible to detect the temperature of the pump casing, and when the temperature rises above a predetermined temperature, a part of the water in the water supply pump main body whose temperature has risen can be discharged to the outside. In this state, low-temperature water is supplied from the water inlet of the water supply pump main body into the pump casing, so that the shortage of water in the water supply pump main body is replenished and the water and cooling water in the water supply pump main body are replenished. Since the temperature of the cooling water in the passage is lowered, it is possible to effectively cool the water-cooled engine during the pump shutoff operation, and it is possible to prevent the water-cooled engine from overheating or burning.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a schematic configuration of an embodiment of a reflux type water-cooled engine pump according to the present invention.

FIG. 2 is a longitudinal sectional view showing a first embodiment of the temperature operated valve mechanism used in this embodiment.

3 is a vertical cross-sectional view showing a state in which a valve body of the temperature operated valve mechanism shown in FIG. 2 is opened.

FIG. 4 is a longitudinal sectional view showing a second embodiment of the temperature operated valve mechanism used in this embodiment.

5 is a longitudinal sectional view showing a state in which a valve body of the temperature operated valve mechanism shown in FIG. 4 is opened.

FIG. 6 is a vertical sectional view showing a third embodiment of the temperature operated valve mechanism used in this embodiment.

7 is a vertical cross-sectional view showing a state where the valve body of the temperature operated valve mechanism shown in FIG. 6 is opened.

FIG. 8 is a vertical sectional view showing a fourth embodiment of the temperature operated valve mechanism used in this embodiment.

FIG. 9 is a vertical sectional view showing a schematic configuration of a conventional reflux type water-cooled engine pump.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Water supply pump main body 1a Pump casing 1b Pump impeller 1c High pressure part 1d Water inlet which is a low pressure part 1e Casing protrusion 2 Water cooling engine 3 Engine body 3a Cylinder 4 Cooling water passage 4a Supply side cooling water passage part 4b Engine side cooling water passage Part 4c Muffler side cooling water passage part 4d Return side cooling water passage part 4e Drain side cooling water passage part 5 Exhaust muffler 6a, 6b Drain cock 8 Water discharge valve 9 Discharge port 10 Drain passage 10a Drain pipe 11 Temperature actuated valve mechanism 12 Valve housing 12a Flange portion 13 Passage 14 Valve seat 15 Valve hole 16 Valve body 17 Seal body 18 Coil spring 19 Spring receiver 19a Water passage hole 20 Cylinder 21 Piston 22 Thermopiston mechanism 23 Spacer 24 Hole 25 Mounting ring 26 Hole 27 Shape memory spring 28 Operation board 29 Connecting rod 30 Hole 31 O-ring 32 Recessed portion 33a, 33b O-ring 34 Communication hole

Claims (5)

[Claims] 1. A water supply pump main body and a water-cooled engine for driving the water supply pump main body, wherein water supplied from a high-pressure portion of the water supply pump main body is used as cooling water for the water-cooled engine, and the water is the above-mentioned water. In a reflux type water-cooled engine pump, which is supplied to a cooling water passage of a water-cooled engine and is returned to the suction port side of a low-pressure part of the water-supply pump main body after cooling the water-cooled engine, A temperature actuated valve mechanism is provided, which opens a valve body when the temperature of the water in the pump body rises above a predetermined temperature and discharges part of the water in the water supply pump body to the outside. Reflux water-cooled engine pump. 2. The temperature-operated valve mechanism, wherein the fluid in the cylinder expands and contracts at the temperature of the water in the water supply pump body to drive a piston in the cylinder, and the valve element is operated by driving the piston. The recirculation type water-cooled engine pump according to claim 1, wherein the structure is provided with a thermo-piston mechanism part. 3. The temperature-operated valve mechanism has a structure including a shape memory spring that expands or contracts at a temperature of water in the water supply pump body to operate a valve body. 1. The reflux type water-cooled engine pump according to 1. 4. The temperature-controlled valve mechanism according to claim 1, further comprising a spring for urging the valve element in a direction of closing the valve hole. Reflux water-cooled engine pump. 5. A water supply pump main body, and a water cooling engine for driving the water supply pump main body, wherein water supplied from a high-pressure part of the water supply pump main body is used as cooling water for the water cooling engine. In a reflux type water-cooled engine pump, which is supplied to a cooling water passage of a water-cooled engine and is returned to the suction port side of a low-pressure part of the water-supply pump main body after cooling the water-cooled engine, The valve body is provided with a temperature actuated valve mechanism that opens the valve body when the temperature of the pump casing of the pump body rises above a predetermined temperature to discharge part of the water in the water supply pump body to the outside. Water-cooled engine pump.