JPH0247227Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a closed engine cooling water expansion tank that is an improved cooling water storage accumulator attached to an engine cooling water facility.

(Prior Art) In engine cooling water equipment, there is a growing trend toward effective energy use in which heat is recovered as hot water by circulating engine cooling water to heat recovery plant equipment using a hot water circulation pump. However, few heat recovery plant equipment such as air-conditioning equipment or cooling equipment that utilizes this heat are treated with anti-corrosion treatment, and it is necessary to suppress the occurrence of rust due to dissolved oxygen in hot water. For this reason, conventional methods have been adopted in which the increased amount of hot water due to thermal expansion is stored in an accumulator, and the entire system is sealed.

(Problem that the invention aims to solve) However, when using the closed type as described above, it is necessary to increase the pressure of the system or extremely increase the capacity of the accumulator, which increases equipment costs. There were some drawbacks.

(Means for Solving the Problems) The present invention has been made in view of the above-mentioned drawbacks of the prior art, and therefore, the present invention includes a tank for storing water by allowing the increase in thermal expansion of the cooling water to flow in from the engine cooling water equipment; A flexible member fixed around the upper end of the tank, an upper cover fixed to the flexible member and capable of expanding upwardly of the tank, an atmospheric dissipation pipe that penetrates the upper cover and protrudes into the tank, and a lower part of the tank. The basic feature is that it has a conduction pipe connected to the suction side of the hot water circulation pump, and as a closed type, there is no chance of contact with air, and the pressure increase in the tank can be bulged by a flexible material. The aim is to absorb the liquid by raising the top lid.

(Example) Specific examples of the present invention will be described below based on the drawings.

The drawing is a system diagram of an engine cooling water facility equipped with an embodiment of the tank of the present invention. 100 in the diagram
101 is an engine, 101 is an exhaust heat recovery device, and 102 is a heat recovery plant equipment such as air conditioning equipment or cooling equipment. The cooling water that cooled the engine 100 and recovered heat is further heated by the exhaust gas of the engine 100 in the exhaust heat recovery device 101, and is heated by the hot water circulation pump 10.
3, the cooling water is circulated to the heat recovery plant equipment 102 where sensible heat is recovered, and then the cooling water is circulated again to the engine 100 by the cooling water pump 104.

The present invention is a closed expansion tank attached to such engine cooling water equipment, and includes tank 1,
A flexible member 2 at the upper end of the tank 1, a top cover 3 fixed to the flexible member 2, an atmospheric dissipation pipe 4 provided on the top cover 3, and a conductor connecting the tank 1 to engine cooling water equipment. It has a tube 5.

The tank 1 stores an increased amount of cooling water that has increased due to thermal expansion in the engine cooling water equipment. Therefore, in this embodiment, the exhaust heat recovery device 101
Cooling water that has thermally expanded and increased from the heat recovery plant equipment 102 can flow into the tank 1. At the time of the inflow, air vents 105, 105 are provided on the inlet side of the tank 1 so that dissolved oxygen contained in the cooling water can be released into the tank 1 when it is heated and comes out as bubbles.

The flexible member 2 is air-tightly fixed around the upper end of the tank 1, and is made of rubber, air-tight canvas, bellows, or the like.

The upper lid 3 is air-tightly fixed around the other end of the flexible member 2, and together with the flexible member 2, the tank 1 is sealed. However, when the pressure inside the tank 1 increases, the upper lid 3 becomes flexible. The material 2 allows the tank 1 to bulge upward.

The atmospheric dissipation pipe 4 penetrates the upper lid 3 and protrudes into the tank 1, and its lower part is normally located below the cooling water level in the tank 1.
When the water rises to the surface of the water, it releases steam into the atmosphere.

Furthermore, the conduction pipe 5 is connected from the lower part of the tank 1 to the suction side of the hot water circulation pump 103. When actually installed, due to the characteristics of the hot water circulation pump 103,
If the required minimum head (Hm) is provided between the lower part of the tank 1 and the inlet side of the hot water circulation pump 103,
Cavitation of the pump 103 can be effectively prevented even if the piping resistance of the system increases.

(Function) In the closed expansion tank having the above configuration, cooling water flowing from the engine cooling water equipment is stored in the tank 1. In this case, the upper cover 3 is supported by the flexible member 2 and It is stored in tank 1. However, the increased amount of expansion of the cooling water in the tank 1 due to the expansion of the cooling water due to temperature changes in the hot water system is absorbed by the upper lid 3 being raised in accordance with the increased amount. Since the upper lid 3 moves up and down with the cooling water sealed by the soft flexible material 2, it is possible to prevent pressure from increasing due to expansion of the cooling water.

On the other hand, when a large amount of steam is generated due to a rise in the temperature of the cooling water, the upper lid 3 rises due to the steam pressure and the lower part of the atmospheric diffusion pipe 4 is positioned above the liquid level, so that the problem can be detected through this radiation pipe 4. Vapors are dissipated into the atmosphere.

Even in the unlikely event that the flexible member 2 is stretched too much and the upper lid 3 is restrained and cannot be raised, a breather valve 106 is provided on the upper lid 3 to prevent abnormal steam (if it becomes full of cold water). cooling water) can be released into the atmosphere.

In the figure, 107 and 108 are liquid level detectors that detect the upper and lower limits of the liquid level, and 109 is these detectors 1.
A liquid level detection switch that controls the operation of a water supply pump 110, which will be described later, based on the detection results measured at 07 and 108, 110 is a water supply pump, 111 is a water supply tank, and 112 is a water supply pipe that supplies water to tank 1. If the liquid level drops abnormally, etc., the liquid level detector 10
When the lower limit liquid level is detected at step 8, the liquid level detection switch 109 operates the water supply pump 110 to supply water from the water tank 111 to the tank 1 through the water supply pipe 112, and at the same time, the liquid level detector 107 detects the upper limit of water supply. At times, the switch 109 turns off the water supply pump 1.
10 and the water supply. At this time, the liquid level detector 107 and the liquid level detection switch 109
are connected to each other by a flexible tube 113 that can follow the movement of the upper cover 3 as it moves up and down. Furthermore, 114 is a temperature control valve provided on the system outlet side of the exhaust heat recovery device 101, and when the engine 100 is started,
When the temperature of the cooling water is low, the system is bypassed and the cooling water is directly flowed to the inlet side of the cooling water pump 104 to cool the engine 10.
0 to a certain degree, and from the time when the temperature reaches a predetermined temperature or higher, circulate it into the system,
The aim is to perform efficient heat recovery.

(Effects of the invention) According to the sealed expansion tank of the invention having the above-mentioned configuration, the liquid level in the tank does not come into contact with the air, and the pressure increase is absorbed by the expansion of the upper lid to reduce the pressure increase as much as possible. This reduces the pressure increase in the system without the need to increase tank capacity or strengthen equipment, and minimizes the amount of dissolved oxygen in the cooling water to prevent rust in plant equipment. It has the excellent effect of being able to be carried out effectively.

[Brief explanation of the drawing]

The drawing is a system explanatory diagram showing a closed expansion tank according to an embodiment of the present invention attached to engine cooling water equipment. In the figure, 1 is a tank, 2 is a flexible member, 3 is an upper lid, 4 is an atmosphere dissipation pipe, and 5 is a conduction pipe.

Claims (1)

[Scope of utility model registration request] A tank attached to engine cooling water equipment that circulates engine cooling water to heat recovery plant equipment using a hot water circulation pump, and a tank that stores the increased thermal expansion of the cooling water from the equipment, and a tank that is fixed around the upper end of this tank. a flexible member, an upper lid that is fixed to the flexible member and can bulge above the tank, an atmospheric diffusion pipe that can penetrate the upper lid and protrude into the tank, and a suction side of the hot water circulation pump from the bottom of the tank. A closed engine cooling water expansion tank, characterized in that it has a conduction pipe connected to.