JPH0241303Y2 - - Google Patents

Description

[Detailed description of the invention] <<Industrial application>> This invention relates to a cooling system for a horizontal engine, in particular, it generates steam in a water jacket, guides this steam into a heat radiation pipe of a condenser, and connects the heat radiation pipe to the heat radiation pipe. This relates to a condenser-type cooling device that cools and condenses steam by exchanging heat with outside air.

<Prior art> A cooling method in which water is evaporated in a water jacket and the steam is guided to a radiator tube for cooling and condensation uses the latent heat of evaporation, so the amount of cooling is lower than that in which water is circulated. It has the advantage of being able to cool with a large amount of water,
If the cooling efficiency of the heat dissipation tube is low, the cooling water will be lost.

Therefore, in order to prevent cooling water from dissipating, an auxiliary tank is installed on the side of the condenser, and the upper tank of the condenser and the lower part of the auxiliary tank are connected through a connecting pipe with heat dissipation fins, and the upper part of the auxiliary tank is connected to the upper tank of the condenser. It is known that a pressure regulating valve is installed to cool the steam flowing out from the upper tank while it passes through a connecting pipe, and the condensed water generated by this cooling is stored in an auxiliary tank (Jikkosho).
44-28022).

<<Problems to be solved by the invention>> In the conventional example described above, heat dissipation fins are provided in the connecting pipe that connects the upper tank and the auxiliary tank, and the steam is condensed and liquefied in this connecting pipe, and then condensed in the auxiliary tank. Since the engine is configured to store water, if the engine is operated continuously for a long period of time, there may be a shortage of cooling water. In addition, since steam condenses in the connecting pipe, the upper tank (connecting pipe)
As the pressure inside the condenser pipe becomes lower, the temperature at which condensation starts in the condenser pipe becomes lower. As a result, the steam begins to condense at a high position in the condenser pipe, and the condensed water begins to flow down inside the condenser pipe, but the steam rising one after another comes into contact with the condensed water and the amount of condensed water increases, causing the condensed water to The condenser pipe is blocked at a high position, and the condensed water that is blocking the condenser pipe is forced out by steam pressure, causing thermal changes that cause the joint between the condenser pipe and the upper tank to expand and contract, for example. Repeat at a fast pace of 3 times per minute. Therefore, due to the repeated stress, the brazing material (solder, etc.) at the joint loses its shear resistance, causing the joint to break.

<Means for solving the problem> The present invention sets the condensation start position at a low position in the condenser pipe by maintaining the pressure in the upper tank high. In the condenser type water cooling device, the starting end of the pressure buffering pipe is connected to the upper tank in communication, a pressure valve is located at the terminal end, and at least a part of the pressure buffering pipe is formed into an elastic expansion part. It is said that

<Operation> In the present invention, in a condenser-type water cooling system for a horizontal engine, the starting end of the pressure buffering pipe is connected to the upper tank in communication, and a pressure valve is located at the terminal end of the pipe, so that the pressure buffering pipe can be elastically expanded. Because of this structure, pressure changes in the upper tank are buffered by the expansion and contraction of the expansion part formed in the pressure buffer pipe, and the pressure valve does not operate due to small and impactful pressure changes caused by steam generation. As a result, the opening pressure of the pressure valve can be set high, and the condenser is placed under pressure, so the steam starts condensing at a high temperature, condensing at the bottom of the heat dissipation pipe, and this Condensed water quickly returns to the water jacket. Therefore, repeated expansion and contraction at the joint between the heat dissipation tube and the upper tank is eliminated.

<<Example>> Fig. 1 is a longitudinal sectional side view of a main part, Fig. 2 is a partially longitudinal sectional front view of a horizontal gas engine equipped with a condenser type cooling device, and Fig. 3 is an exploded perspective view.

This engine body E includes a cylinder 4 in which a piston 3 is fitted in a horizontally movable manner on one side of a crankcase 2 that supports a crankshaft 1, and a spark plug 5, an air supply/exhaust valve 6, a Rotzker arm 7, etc. are mounted on the outside of the cylinder 4. It has a structure in which a cylinder head 8 with a
0, a muffler 11, and a condenser type water cooling device C.

A water jacket 12 is formed around the cylinder 4, and communicates the water jacket 12 with a cooling water jacket 13 in the cylinder head 8. The upper part of the water jacket 12 is opened to the upper surface of the crankcase 2. There is. A hollow base 14 is attached to close this opening, and a capacitor 15 is erected on this base 14.

The lower front portion of the base 14 communicates with the opening of the water jacket 12, and the base 14
The capacitor mounting seat 16 has an opening 17 at the rear of the upper wall.
The bottom plate 18 of the condenser 15 is fixed to the condenser mounting seat 16, so that boiling water from the water jacket 12 is difficult to flow directly into the condenser 15.

The condenser 15 introduces the steam in the base into a group of heat dissipation tubes 19 with fins and transfers it to the upper tank 2.
While the water is being brought to zero, heat is radiated and cooled by the cooling air from the fan 21, and the condensed water is caused to flow down along the heat radiation pipe 19 and returned to the water jacket 12.

The cooling device C of the present invention has the following configuration added to the above-mentioned basic configuration.

That is, as shown in FIG.
A pressure buffer pipe 22 is led out from the pressure buffer pipe 22, and a pressure valve 23 is located at the tip of the pressure buffer pipe 22. This pressure valve 23 is connected to the pressure buffer pipe 2
2 is compressed and deformed to form a flow path in a closed shape. In addition, the pressure buffer pipe 22
It is made of an elastic material and is able to expand and contract elastically. Therefore, the entire pressure buffer pipe 22 becomes the expansion section 24.

With this configuration, pressure fluctuations occurring within the upper tank 20 are absorbed by expansion or contraction deformation of the pressure buffer pipe 22, so that the pressure set by the pressure valve 23 acts within the upper tank as is. Since the inside of the condenser is kept in a pressurized atmosphere, the temperature at which vapor starts condensing becomes high. As a result, the efficiency of steam condensation within the condenser is high, and no steam leaks.

In the figure, reference numeral 25 denotes a water supply port disposed on the base 14, and this water supply port 25 is closed by a pressure regulating valve 26 set at a pressure higher than the opening set pressure of the pressure valve 23. Moreover, the code 27 is the water jacket 1
This is a pipe for setting the water level of the cooling water in 2.

FIG. 4 shows another embodiment of the present invention, in which a pressure valve 23 composed of a bottomed cylindrical container 28 and a pressure cap 29 that closes the opening thereof is arranged on the base 14, and the pressure Valve 23 and upper tank 2
0 through a pressure buffer pipe 22, and a balloon-shaped expansion chamber 2 is provided in the middle of this pressure buffer pipe 22.
4 was formed.

FIG. 5 shows a modification of the expansion part 24 formed in the middle of the pressure buffer pipe 22, in which the expansion chamber 24 is formed in a bellows shape.

Note that the pressure buffer pipe 22 may have a constricted portion formed in the middle thereof.

<<Effects>> The present invention, in a condenser type water cooling system for a horizontal engine, connects the starting end of a pressure buffer pipe to the upper tank in communication, locates a pressure valve at the terminal end of the pipe, and makes at least a portion of the pressure buffer pipe elastic. Since it is formed in the expansion part, small pressure fluctuations that frequently occur in the upper tank are absorbed by the expansion and contraction action of the elastic expansion part of the pressure buffer pipe between the upper tank and the pressure valve. The pressure valve does not operate due to small and shocking pressure fluctuations, and the condenser can be maintained at a high pressure. Furthermore, since the pressure buffer pipe is provided with the elastic expansion section, the opening pressure of the pressure valve can be set high. As a result, the condensation start temperature of the steam becomes higher and the condensation starts at a lower position inside the heat radiation pipe, so the exchange of condensed water and steam inside the heat radiation pipe can be performed smoothly, and the steam transfers the condensed water to the upper tank. This eliminates the possibility of extrusion inward, and the repetitive thermal stress caused by rapid temperature changes is no longer applied to the joint between the upper tank and heat dissipation pipe, eliminating damage to the joint between the heat dissipation pipe and the upper tank and improving durability. can be done.

Furthermore, since the condensation starting position in the condenser is low, condensation is completed in the heat dissipation tube, so there is almost no consumption of cooling water, and it is possible to prevent a decrease in cooling performance due to a drop in the cooling water level.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a vertical side view of the main parts, FIG. 2 is a partially vertical front view of a horizontal gas engine, FIG. 3 is an exploded perspective view, and FIG. 4 is a different embodiment. FIG. 5 is a sectional view of a main part showing a modification of the expansion chamber. 12...Water jacket, 15...Condenser, 16...Mounting seat, 17...Top opening of 12, 18...Bottom plate of 15, 19...Radiation tube, 20
... Upper tank, 22 ... Pressure buffer pipe, 23 ... Pressure valve, 24 ... Elastic expansion section.

Claims (1)

[Claims for Utility Model Registration] 1. An upper opening 17 of the water jacket 12 on the upper wall of the water jacket 12 of a horizontal engine.
and a mounting seat 16 surrounding the capacitor 15, and fix the bottom plate 18 of the capacitor 15 to the mounting seat 16. In a condenser-type water cooling system for a horizontal engine, which is penetrated through the lower wall and fixed by brazing with a brazing material, the upper tank 2
A horizontal type characterized in that a starting end of a pressure buffering pipe 22 is communicatively connected to the pressure buffering pipe 22, a pressure valve 23 is located at the terminal end thereof, and an elastic expansion portion 24 is formed in at least a part of the pressure buffering pipe 22. Engine condenser water cooling system. 2. A condenser-type water cooling device for a horizontal engine as set forth in claim 1 of the utility model registration claim, in which the tip of the pressure buffer pipe 22 is compressed and deformed into a flat tip, and the pressure valve 23 is formed by the flat tip.