JPH0610577B2 - Expansion tank of cooling water supply device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention is intended to absorb pressure fluctuations in a cooling water circulation circuit in a cooling water supply device that circulates and supplies cooling water at a constant pressure to cool an object to be cooled. Of expansion tanks.

[Conventional technology]

A cooling water supply device of this type is known as shown in FIG. In FIG. 3, reference numeral 1 denotes a body to be cooled, which is incorporated with a heat exchanger 2 that uses cooling water as a refrigerant. The heat exchanger 2 is manufactured to have a strength that can withstand a pressure slightly higher than atmospheric pressure, and has a heat exchange characteristic. Is improved and the weight is reduced.
A cooling water supply device 3 includes a radiator 5 for radiating heat of the cooling water, a water pump 6 for circulating the cooling water in the direction of arrow A, and a later-described pipe 5 connected to the heat exchanger 2. A pressure adjusting valve 8 is provided in the middle of a bypass pipe 41 which is connected to the pipe 4 and bypasses the heat exchanger 2 and which is provided with a water pressure pump 6, a radiator 5, The expansion tank 7, the pressure control valve 8 and the like form a cooling water circulation circuit that circulates the cooling water to the heat exchanger 2 at a constant pressure. The cooling water supply device 3 circulates and supplies the cooling water to the heat exchanger 2 to cool the object to be cooled 1. However, in the cooling water circulation circuit, for example, a transient force increase at the start of operation of the water pump 6 or Pressure fluctuations occur due to pressure rises due to temperature rise of residual air in the circuit. This pressure fluctuation is caused by the pressure control valve 8
The cooling water corresponding to the increased pressure flows through the bypass pipe 41 to the expansion tank 7 and is absorbed by the expansion tank. Therefore, the cooling water circulating in the heat exchanger 2 is always kept at a constant pressure slightly higher than the atmospheric pressure on the inlet side, and the outlet side becomes substantially atmospheric pressure, and a predetermined pressure difference between the inlet side and the outlet side occurs. can get.

As shown in FIGS. 3 and 4, the expansion tank 7 is formed by a liquid chamber 12 formed by a case 11 and a bellows case 13 continuously provided on the upper surface of the case 11 and formed with a vent hole 1
An air chamber 14 communicating with the liquid chamber 12 via 1a is provided, and a closed structure is provided in which the inside of the tank is shielded from the outside air in order to prevent foreign matter in the atmosphere from entering the cooling water and oxidative corrosion of the pipeline member. Has been. In addition, a case 11 connected to the pipe 4 through a connecting pipe 15 is provided with a water inlet 16 with a lid and a water level gauge 17, and the bellows case 13 has an appropriate height outside which also serves as container protection. A bellows guide 18 is attached.

The expansion tank 7 stores an appropriate amount of cooling water flowing through the cooling water circulation circuit in the liquid chamber 12, and the amount of the stored water increases or decreases according to the pressure fluctuation in the cooling water circulation circuit to absorb the pressure fluctuation. Further, as the amount of stored water increases and decreases, the room air moves between the liquid chamber 12 and the air chamber 14, and the bellows case 13 expands and contracts to expand or contract the air chamber 14. As a result, the inside of the tank is maintained at a substantially atmospheric pressure, and is maintained at a substantially atmospheric pressure on the cooling water outlet side of the heat exchanger 2.

[Problems to be Solved by the Invention]

However, in the conventional expansion tank 7, the height of the bellows guide 18 adjusted when the bellows case is extended is considerably high, the installation space for the cooling water supply device 3 is increased, and the body to be cooled 1 and the cooling water supply device 3 are arranged in parallel. There was a problem that only the expansion tank 7 was projected in the installation.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an expansion tank in a cooling water supply device, in which the problem of disposition in which the expansion tank protrudes is eliminated and the installation space of the cooling water supply device can be reduced.

[Means for Solving the Problems]

According to the present invention, a closed cooling water circulation circuit that circulates cooling water at a constant pressure to a heat exchanger contained in a body to be cooled is configured with a water pump, a radiator, a pressure adjusting valve, etc. In the expansion tank of the cooling water supply device having a closed structure for absorbing the pressure fluctuation, the liquid chamber communicating with the cooling water circulation circuit and storing the cooling water, and the air chamber capable of enlarging and reducing the internal volume are provided. This is achieved by connecting and communicating the air chamber and the liquid chamber with a ventilation pipe.

[Action]

According to the above means, the air chamber is provided separately from the liquid chamber,
A ventilation pipe connects them to reduce the installation space without impairing the function.

〔Example〕

1 and 2 show an embodiment of the present invention,
The same or similar parts as those in FIGS. 3 and 4 are designated by the same reference numerals.

In FIG. 1 and FIG. 2, the liquid chamber 1 connected to the conduit 4 is shown.
The case 11 forming 2 has a connection port 11b at its upper end. Further, the bellows case 13 is provided with a mounting portion 13b having a connection port 13a at the bottom thereof, and the bellows 1
3c is provided to separate the case 11 from the case 11 to form an air chamber 14 sealed inside. Reference numeral 20 is a connection pipe that is connected to the connection port 11b of the case 11 and the connection port 13a of the bellows case 13 and connects the liquid chamber 12 and the air chamber 14 to each other.

In the above-mentioned structure, the expansion tank 7 is installed on the floor where the bellows case 13 is installed with the cooling water supply device, and is connected to the case 11 by the appropriately bent ventilation pipe 20. However, the expansion tank 7 performs the same function as the conventional one,
Moreover, since it is divided into the case 11 and the bellows case 13, it does not project when the cooling water supply device 3 is installed.

〔The invention's effect〕

According to this invention, a liquid chamber communicating with the cooling water circulation circuit for storing the cooling water and an air chamber capable of enlarging and reducing the internal volume are provided, and the air chamber and the liquid chamber are connected and communicated by a ventilation pipe. Therefore, the height is reduced to about half without impairing the function, and the problem that the expansion tank projects while the cooled object and the cooling water supply device are arranged in parallel is solved, and the cooling water supply device The installation space can be reduced.

[Brief description of drawings]

FIG. 1 is a sectional view of an expansion tank showing an embodiment of the present invention,
FIG. 2 is a cooling water circulation circuit diagram of a cooling water supply device having an expansion tank according to the embodiment, FIG. 3 is a cooling water circulation circuit diagram of a cooling water supply device having a conventional expansion tank, and FIG. 4 is a conventional expansion tank. FIG. 1 ... Object to be cooled, 3 ... Cooling water supply device, 7 ... Expansion tank, 12 ... Liquid chamber, 14 ... Air chamber, 20 ... Vent pipe.

Claims (1)

[Claims] 1. A closed cooling water circulation circuit for circulating cooling water at a constant pressure to a heat exchanger contained in an object to be cooled, the cooling water circulation circuit comprising a water pump, a radiator, a pressure adjusting valve, and the like. In an expansion tank of a cooling water supply device having a closed structure for absorbing pressure fluctuations inside, a liquid chamber communicating with the cooling water circulation circuit for storing cooling water and an air chamber capable of enlarging and reducing the internal volume are provided. Further, an expansion tank of a cooling water supply device, characterized in that the air chamber and the liquid chamber are connected and communicated with each other by a ventilation pipe.