JPH1172019A - Engine boiling cooling device - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To reduce the cost by making it possible to use an inexpensive diaphragm pump with a small output that does not require a driving power supply for a pressure pump. SOLUTION: Vapor of a refrigerant liquid 5 generated by boiling in a liquid cooling jacket 1 is introduced into a radiator 2 through a circulation forward path 3a, and a refrigerant liquid 5 condensed in the radiator 2 is returned to a circulation return path 3a.
It is configured to reflux into the liquid cooling jacket 1 via b. The pressure feed pump 25 is constituted by a diaphragm pump,
The pressure working chamber 25 a of the diaphragm pump 25 communicates with the exhaust pipe 17 via the exhaust gas cooling pipe 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a boiling cooling device for an engine, and more particularly, to a boiling cooling device for an engine having a diaphragm pump as a refrigerant liquid pump.

[0002]

2. Description of the Related Art As a prior art of a boiling cooling device for an engine, for example, there is one disclosed in Japanese Patent Application Laid-Open No. 60-98118. As shown in FIG. 5, a liquid cooling jacket 101, a circulation forward path 103a, a radiator 102 having a cooling fan 104, a circulation return path 103b, and a liquid cooling jacket 1 are provided.
01 in this order to form a refrigerant circulation path 103, in which the vapor of the refrigerant liquid 105 generated by boiling in the liquid cooling jacket 101 is radiated by the radiator 10 through the circulation outward path 103a.
2 and condensed in the radiator 102
05 is provided in the circulation return path 103b.
5 allows the liquid to flow back into the liquid cooling jacket 101.

In this prior art, a liquid cooling jacket 101 is used.
A temperature detecting means 110 for detecting a liquid temperature and a liquid level detecting means 123 for detecting a liquid level are provided therein, a second liquid level detecting means 129 is provided in a lower tank 2b of the radiator 102, and a reservoir tank 108 is provided. The electromagnetic valve 109 is provided in communication with the cylinder jacket 101b via the communication passage 1106, and an electromagnetic valve 109 is provided in the middle of the communication passage 106. The electromagnetic valve 109 is connected to the electromagnetic valve 109 based on the detection of the liquid temperature and the liquid level in the liquid cooling jacket 101. It is configured to control the pressure pump 125 and start the cooling fan 104 based on the detection of the liquid level by the second liquid level detecting means 129. Note that reference numeral 50 in FIG. 3A indicates a control device.

[0004] By the way, in this type of evaporative cooling device, since the circulation amount of the refrigerant liquid is small, an electric pressure pump has been adopted although a diaphragm pump having a small output is originally sufficient. It depends on the following circumstances. When a diaphragm pump is employed, the pressure of the refrigerant liquid 105 condensed in the radiator 102 and returned to the circulation return path 103b (the refrigerant pressure in the refrigerant liquid pressure transmission chamber of the diaphragm pump) is
It is defined by the set pressure of the radiator cap (relief valve), but it is positive with respect to the pulsating pressure (negative pressure) in the intake pipe or crankcase, and the pressure working chamber of the diaphragm pump is connected to the intake pipe or crankcase. (Hereinafter referred to as “low-pressure pulsating section”), the diaphragm pump cannot be driven. In other words, the refrigerant pressure rises to or above the elastic limit of the diaphragm material,
Since the diaphragm is deformed to a point near the limit, the diaphragm pump cannot be driven by the pulsating pressure (negative pressure) in the intake pipe or the crankcase.

On the other hand, the maximum value of the pulsation pressure in the exhaust pipe is 1.8 k.
Since the pressure rises to gf / cm ² gauge, it is possible to drive the diaphragm pump by connecting the pressure working chamber of the diaphragm pump to the exhaust pipe. But,
Hot exhaust gas enters the pressure working chamber of the diaphragm pump and directly contacts the diaphragm, thereby reducing the durability of the diaphragm. For this reason, although an inexpensive diaphragm pump with a small output is sufficient, an expensive electric pump must be adopted.

[0006]

As described above, since the conventional electric pump has been adopted, the output is unbalanced and a separate pump drive power source is required, resulting in an increase in cost.
SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned drawbacks of the prior art, and it is an object of the present invention to reduce the cost by making it possible to use a low-power and inexpensive diaphragm pump that does not require a driving power supply for a pressure pump. I do.

[0007]

In order to achieve the above object, the present invention is configured as follows. The invention according to claim 1 is, for example, as shown in FIG.
The vapor of the refrigerant liquid 5 generated by the boiling inside
a, the refrigerant liquid 5 condensed in the radiator 2 is returned to the liquid cooling jacket 1 via a pressure pump 25 provided in the circulation return path 3b. In the boiling cooling device for an engine, the pressure pump 25 is constituted by a diaphragm pump, and the pressure working chamber 25a of the diaphragm pump 25 is connected to the exhaust gas cooling pipe 20.
And is connected to the exhaust pipe 17 through the

According to the second aspect of the present invention, as shown in FIG. 2, for example, the vapor of the refrigerant liquid 5 generated by boiling in the liquid cooling jacket 1 is introduced into the radiator 2 through the circulation forward path 3a. The refrigerant liquid 5 condensed in the radiator 2 is returned to the circulation return path 3.
b, in the boiling cooling device for the engine configured to recirculate into the liquid cooling jacket 1 through the pressure pump 25 provided in the pressure pump 25, the pressure pump 25 is constituted by a diaphragm pump, and the pressure working chamber 2 of the diaphragm pump 25 is
5a is communicated with an exhaust pulsation chamber 23 attached to the exhaust pipe 17 via a heat-resistant diaphragm 22, and the communication space is filled with a pressure transmitting fluid 24.

According to a third aspect of the present invention, as shown in FIG. 3, for example, the vapor of the refrigerant liquid 5 generated by boiling in the liquid cooling jacket 1 is introduced into the radiator 2 through the circulation forward path 3a. The refrigerant liquid 5 condensed in the radiator 2 is returned to the circulation return path 3.
b, in the boiling cooling device of the engine configured to recirculate into the liquid cooling jacket 1 via the pressure pump 25 provided in the pressure pump 25, the pressure pump 25 is constituted by a diaphragm pump, and the pressure working chamber 2 of the diaphragm pump 25 is
5a communicates with the low-pressure pulsating part 15 of the engine,
A balancer spring 34 is provided in the pressure working chamber 25a, and the balancer spring 34 is opposed to the refrigerant pressure in the refrigerant liquid pressure supply chamber 25b of the diaphragm pump 25.

According to a fourth aspect of the present invention, as shown in FIG. 4, for example, the vapor of the refrigerant liquid 5 generated by boiling in the liquid cooling jacket 1 is introduced into the radiator 2 through the circulation forward path 3a. The refrigerant liquid 5 condensed in the radiator 2 is returned to the circulation return path 3.
b, an evaporative cooling device for an engine configured to recirculate into the liquid cooling jacket 1 via a pressure pump 25 provided in the pressure pump 25. The pressure pump 25 is constituted by a diaphragm pump.
5a and the air communication chamber 25c are connected to a large area diaphragm 26a.
And the air communication chamber 25c and the refrigerant pressure chamber 25b are partitioned by a small-diameter diaphragm 26b. The area diaphragm 26b is connected to the area diaphragm 26b by a rod 35 so as to be interlocked therewith.

[0011]

According to the present invention, the following functions and effects can be obtained. (A) According to the first aspect of the present invention, in a boiling cooling device for an engine having the same basic configuration as that of the conventional example, the pressure feed pump 25 is constituted by a diaphragm pump, and the pressure working chamber 25a of the diaphragm pump 25 is formed by an exhaust gas. Cooling pipe 2
Since the internal pressure of the pressure working chamber 25a becomes higher than the pressure of the refrigerant in the refrigerant liquid pressure sending chamber 25b because the communication with the exhaust pipe 17 is performed through 0, the diaphragm pump can be driven. Moreover, since the exhaust gas is cooled through the exhaust gas cooling pipe 20, it is possible to avoid a decrease in the durability of the diaphragm caused by the high-temperature exhaust gas directly contacting the diaphragm 26. This eliminates the need for a driving power supply for the pressure feed pump, and reduces costs by using a low-power, inexpensive diaphragm pump.

(B) According to the second aspect of the present invention, in the boiling cooling device for an engine having the same basic configuration as described above, the pressure feed pump 25 is constituted by a diaphragm pump, and the pressure working chamber 25a of the diaphragm pump 25 is formed by the diaphragm pump 25. The pulsation pressure in the exhaust pipe 17 pulsates the heat-resistant diaphragm 22 because the pulsation pressure in the exhaust pipe 17 is communicated with the exhaust pulsation chamber 23 provided in the exhaust pipe 17 via the heat-resistant diaphragm 22 and the communication space is filled with the pressure transmitting fluid 24. The pulsating pressure drives the diaphragm pump 25 via the pressure transmitting fluid 24 filled in the communication space between the pressure working chamber 25a of the diaphragm pump 25 and the exhaust pulsating chamber 23. This eliminates the need for a driving power supply for the pressure feed pump, and reduces costs by using a low-power, inexpensive diaphragm pump. In particular, in the present invention, since the exhaust gas is blocked by the heat-resistant diaphragm 22, the durability of the diaphragm is reduced due to the high-temperature exhaust gas directly contacting the diaphragm, and contaminant particles in the exhaust gas enter the pressure working chamber 25a. Can be prevented.

(C) According to the third aspect of the invention, in the boiling cooling device for an engine having the same basic configuration as described above, the pressure pump 25 is constituted by a diaphragm pump, and the pressure working chamber 25a of the diaphragm pump 25 is formed by the diaphragm pump 25. The balancer spring 34 is provided in the pressure working chamber 25a and communicates with the low-pressure pulsating portion 15 of the engine. The resilience of the low pressure pulsating part 15 and the refrigerant pressure in the refrigerant liquid pressure feed chamber 25b are balanced via the diaphragm in this balanced state. The pump 25 is driven. That is,
In the present invention, the diaphragm pump 25 can be driven even when the refrigerant pressure in the refrigerant liquid pressure supply chamber 25b becomes higher than the pulsation pressure of the low-pressure pulsation part 15. This eliminates the need for a driving power supply for the pressure feed pump, and reduces costs by using a low-power, inexpensive diaphragm pump.

(4) According to the fourth aspect of the present invention, in the boiling cooling device for an engine having the same basic configuration as described above, the pressure pump 25 is constituted by a diaphragm pump, and the diaphragm pump 25 is connected to the pressure working chamber 25a. The air communication chamber 25c is partitioned by a large-area diaphragm 26a, and the air communication chamber 25c and the refrigerant liquid-pressure sending chamber 25b are partitioned by a small-area diaphragm 26b. In addition, the large-area diaphragm 26a and the small-area diaphragm 26b are connected to each other by the rod 35 so as to be interlocked, so that the pulsating pressure p of the low-pressure pulsating section 15 is
The force (p × S) acting on the diaphragm 26a having the large area S via the pressure a is larger than the force (P × s) acting on the diaphragm 26b having the small area s due to the refrigerant pressure P in the refrigerant liquid pressure transfer chamber 25b. can do. That is, in the present invention, even when the refrigerant pressure in the refrigerant liquid pressure supply chamber 25b becomes higher than the pulsation pressure of the low-pressure pulsation part 15, the large-area diaphragm 26a
The diaphragm pump 25 can be driven by connecting the small-diameter diaphragm 26b and the small-area diaphragm 26b by the rod 35. This eliminates the need for a driving power supply for the pressure feed pump, and reduces costs by using a low-power, inexpensive diaphragm pump.

[0015]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram of a boiling cooling device for an engine according to a first embodiment of the present invention. As shown in FIG. 1, this boiling cooling apparatus is employed in a vertical single-cylinder air-cooled general-purpose engine E. The engine E includes a cylinder block 11 in which a crankcase and a cylinder are integrated. A cylinder head 10 is assembled on the upper part. Here, reference numeral 12 denotes a cooling fan of the engine, 13 denotes a fan cover, 14 denotes a cooling air intake, 15 denotes an intake pipe, 16 denotes an air cleaner, 17 denotes an exhaust pipe, and 18 denotes an exhaust muffler.

This boiling cooling device has the same basic configuration as that of the conventional example. That is, as shown in FIG. 1, the liquid cooling jacket 1, the circulation forward path 3 a, the radiator 2 having the cooling fan 4, the circulation return path 3 b, and the communication port 6 to the liquid cooling jacket 1 sequentially communicate with each other. And the liquid cooling jacket 1
The vapor of the refrigerant liquid 5 generated by the boiling inside
a, the refrigerant liquid 5 condensed in the heat radiating section 2 is returned to the liquid cooling jacket 1 through the circulation return path 3b. An accumulator 8 and a diaphragm pump 25 are provided in the middle of the circulation return path 3b.
The refrigerant liquid 5 condensed by the radiator 2 is supplied to the diaphragm pump 25.
To feed the liquid cooling jacket 1.

The radiator 2 is composed of a plurality of radiating tubes 2 having radiating fins formed between an upper tank 2a and a lower tank 2b.
c, the refrigerant liquid 5 flowing into the upper tank 2a.
Is condensed and condensed in the heat radiation tube 2c, and the condensed refrigerant liquid 5 flows down from the lower tank 2b. The accumulator 8 divides the refrigerant storage chamber 8a and the pressure regulation chamber 8b with a metal diaphragm 8c, and hermetically communicates the refrigerant storage chamber 8a with the middle of the circulation return path 3b (a liquid phase portion) to form a refrigerant circulation path. The internal pressure of the refrigerant liquid 3 is maintained substantially constant, and the boiling point of the refrigerant liquid 5 is substantially constant. Hereinafter, the characteristic configuration of the boiling cooling device according to the present invention will be described.

In the diaphragm pump 25, a pressure working chamber 25a and a refrigerant liquid pressure sending chamber 25b are partitioned by a diaphragm 26, and a communication port 27 of the pressure working chamber 25a is connected to an exhaust pipe 17 through a coil-shaped exhaust gas cooling pipe 20. And the refrigerant inlet 31 and the refrigerant outlet 32 of the refrigerant pressure delivery chamber 25b.
Is connected to the circulation return path 3b, and the diaphragm pump 25 is driven by an exhaust pressure higher than the refrigerant pressure in the refrigerant liquid pressure supply chamber 25b. Reference numeral 33 denotes a reed valve of the refrigerant inlet 31. According to this embodiment, the pulsating pressure in the pressure working chamber 25a becomes higher than the refrigerant pressure in the refrigerant liquid pressure sending chamber 25b, so that the diaphragm 26 can be driven. Moreover, since the exhaust gas is cooled through the coil-shaped exhaust gas cooling pipe 20, it is possible to avoid a decrease in the durability of the diaphragm caused by the high-temperature exhaust gas directly contacting the diaphragm 26.

FIG. 2 is a schematic diagram of a boiling cooling device according to a second embodiment of the present invention. In this embodiment, the exhaust pipe 1
7 is provided with an exhaust pulsation chamber 23 via a heat-resistant diaphragm 22, a pressure working chamber 25 a of a diaphragm pump 25 is communicated with the exhaust pulsation chamber 23, and the communication space between them is filled with a pressure transmitting fluid 24. Unlike the first embodiment, the other points are configured similarly to FIG. Note that a metal diaphragm may be used as the heat-resistant diaphragm 22, and a gas such as an inert nitrogen gas may be used as the pressure transmitting fluid 24 without being limited to a liquid.

According to the second embodiment, the exhaust pipe 17
The pulsating pressure in the inside pulsates the heat-resistant diaphragm 22, and the pulsating pressure is the pressure transmitting fluid 2 filled in the communication space between the pressure working chamber 25 a of the diaphragm pump 25 and the exhaust pulsating chamber 23.
4 drive the diaphragm pump 25. This eliminates the need for a pump drive power supply, and can reduce costs by using a low-output, inexpensive diaphragm pump.
Moreover, since the exhaust gas is blocked by the heat-resistant diaphragm 22, it is possible to prevent the durability of the diaphragm from being lowered due to the high-temperature exhaust gas coming into direct contact with the diaphragm and prevent the contaminant particles in the exhaust gas from entering the pressure working chamber 25a. Can be prevented.

FIG. 3 is a schematic diagram of a boiling cooling device according to a third embodiment of the present invention. In this embodiment, the pressure working chamber 25a of the diaphragm pump 25 communicates with the intake pipe 15, which is a low-pressure pulsating part of the engine, and a balancer spring 34 is provided in the pressure working chamber 25a. The first embodiment differs from the first embodiment in that it is opposed to the internal refrigerant pressure, and the other points are configured similarly to FIG.

According to the third embodiment, the resilience of the balancer spring 34 and the refrigerant pressure in the refrigerant liquid pressure supply chamber 25b are balanced via the diaphragm. The pressure fluctuation acts via the pressure working chamber 25 a to drive the diaphragm pump 25. Therefore, the diaphragm pump 25 can be driven even when the refrigerant pressure in the refrigerant liquid pressure supply chamber 25b becomes higher than the pulsation pressure of the low-pressure pulsation part 15.

FIG. 4 is a schematic diagram of a boiling cooling device according to a fourth embodiment of the present invention. In this embodiment, the diaphragm pump 25 has a pressure working chamber 25a and an atmospheric communication chamber 25c.
And a pressure chamber 25b. The pressure operation chamber 25a and the air communication chamber 25c are partitioned by a large-diameter diaphragm 26a, and the air communication chamber 25c and the air pressure chamber 25b.
Are partitioned by a small-area diaphragm 26b, and the pressure working chamber 25a communicates with the intake pipe 15 of the engine.
The large area diaphragm 26a and the small area diaphragm 2
6b is connected with a rod 35. In addition,
Reference numeral 28 denotes an atmosphere communication port, and the other points are configured similarly to FIG.

According to the fourth embodiment, the pulsating pressure p of the intake pipe 15 which is a low-pressure pulsating portion acts on the large-area S diaphragm 26a via the pressure working chamber 25a (p × p).
S) is larger than the force (P × s) in which the refrigerant pressure P in the refrigerant liquid pressure transfer chamber 25b acts on the diaphragm 26b having the small area s. Therefore, even when the refrigerant pressure P in the refrigerant liquid pressure transfer chamber 25b becomes higher than the pulsation pressure p of the intake pipe 15, the diaphragm pump is connected to the large-area diaphragm 26a and the small-area diaphragm 26b by the rod 35. 25 can be driven. The low-pressure pulsating part communicating with the pressure working chamber 25a of the diaphragm pump 25 is not limited to the intake pipe 15, but may be a crank chamber.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a boiling cooling device according to a first embodiment of the present invention.

FIG. 2 is a schematic diagram of a boiling cooling device according to a second embodiment of the present invention.

FIG. 3 is a schematic diagram of a boiling cooling device according to a third embodiment of the present invention.

FIG. 4 is a schematic diagram of a boiling cooling device according to a fourth embodiment of the present invention.

FIG. 5 is a schematic diagram of a boiling cooling device according to the related art.

[Explanation of symbols]

Reference numeral 1: liquid cooling jacket, 2: radiator, 3a: circulation forward path, 3
b ... circulation return path, 4 ... cooling fan, 5 ... refrigerant liquid, 15 ... low pressure pulsation part (intake pipe), 17 ... exhaust pipe, 20 ... exhaust gas cooling pipe, 22 ... heat resistant diaphragm, 23 ... exhaust pulsation chamber, 2
4 ... pressure transmitting fluid, 25 ... diaphragm pump (pressure pump), 25a ... pressure working chamber, 25b ... refrigerant liquid pressure feeding chamber,
25c: atmosphere communication chamber, 26: diaphragm, 26a: large area diaphragm, 26b: small area diaphragm, 34
... balancer spring, 35 ... rod.

Claims (4)

[Claims] 1. A vapor of a refrigerant liquid (5) generated by boiling in a liquid cooling jacket (1) is introduced into a radiator (2) through a circulation forward path (3a). An evaporative cooling device for an engine, wherein the refrigerant liquid (5) condensed in the engine is recirculated into the liquid cooling jacket (1) via a pressure pump (25) provided in the circulation return path (3b). The pressure pump (25) is constituted by a diaphragm pump, and the pressure working chamber (2) of the diaphragm pump (25) is formed.
5a) through the exhaust gas cooling pipe (20).
An evaporative cooling device for an engine, which is in communication with (7). 2. Vapor of the refrigerant liquid (5) generated by boiling in the liquid cooling jacket (1) is introduced into the radiator (2) through the circulation forward path (3a), and the radiator (2) An evaporative cooling device for an engine, wherein the refrigerant liquid (5) condensed in the engine is recirculated into the liquid cooling jacket (1) via a pressure pump (25) provided in the circulation return path (3b). The pressure pump (25) is constituted by a diaphragm pump, and the pressure working chamber (2) of the diaphragm pump (25) is formed.
5a) is communicated with an exhaust pulsation chamber (23) attached to an exhaust pipe (17) via a heat-resistant diaphragm (22), and the communication space is filled with a pressure transmitting fluid (24). Engine boiling cooling device. 3. The vapor of the refrigerant liquid (5) generated by boiling in the liquid cooling jacket (1) is introduced into the radiator (2) through the circulation forward path (3a). An evaporative cooling device for an engine, wherein the refrigerant liquid (5) condensed in the engine is recirculated into the liquid cooling jacket (1) via a pressure pump (25) provided in the circulation return path (3b). The pressure pump (25) is constituted by a diaphragm pump, and the pressure working chamber (2) of the diaphragm pump (25) is formed.
5a) is communicated with the low-pressure pulsating part (15) of the engine, and the balancer spring (3) is provided in the pressure working chamber (25a).
4), wherein the balancer spring (34) is opposed to the refrigerant pressure in the refrigerant liquid pressure supply chamber (25b) of the diaphragm pump (25). 4. A vapor of the refrigerant liquid (5) generated by boiling in the liquid cooling jacket (1) is introduced into the radiator (2) through the circulation forward path (3a). An evaporative cooling device for an engine, wherein the refrigerant liquid (5) condensed in the engine is recirculated into the liquid cooling jacket (1) via a pressure pump (25) provided in the circulation return path (3b). The pressure feed pump (25) is constituted by a diaphragm pump, and the diaphragm pump (25) is
5a) and the air communication chamber (25c) are partitioned by a large-area diaphragm (26a), and the air communication chamber (25c) is separated from the air communication chamber (25c).
c) and the refrigerant pressure delivery chamber (25b) are partitioned by a small-area diaphragm (26b), and the pressure working chamber (25a) is partitioned by the low-pressure pulsating part (1) of the engine.
5) and the large-area diaphragm (2)
6a) and the small-area diaphragm (26b) are connected to the rod (3).
An evaporative cooling device for an engine, wherein the device is configured to be linked and interlockable in 5).