Fixed-pressure and stabilized-pressure water replenishment device of heat exchange unit

Abstract

The invention discloses a fixed-pressure and stabilized-pressure water replenishment device of a heat exchange unit. The device mainly consists of a non-negative-pressure booster tank, a submersible pump, a vacuum inhibitor, a pressure sensor and a control box, wherein the submersible pump is mounted in the non-negative-pressure booster tank; outlet water of the submersible pump is provided with a connecting pipe for connecting with a water replenishment pressure pipe outside the non-negative-pressure booster tank; the water replenishment pressure pipe is connected with a secondary water return pipe; a circulating pump is mounted on the secondary water return pipe; the water replenishment pressure pipe is connected to the secondary water return pipe in front of the circulating pump; the secondary water return pipe is provided with a pressure sensor and a safety valve in front of the circulating pump; the vacuum inhibitor is mounted at the top of the non-negative-pressure booster tank; the bottom of the non-negative-pressure booster tank is provided with an inlet for connecting with a running water inlet pipe; a water level sensor is arranged in the non-negative-pressure booster tank; and the control box is fixed at the outer side of the non-negative-pressure booster tank. The device has such advantages as small floor, high efficiency, energy conservation, flexibility and reasonability in control and strong adaptability in the fixed-pressure water replenishment of the heat exchange unit.

Description

technical field [0001] The invention relates to the technical field of heat supply, in particular to a constant-pressure and stable-pressure water replenishment device for a heat exchange unit. Background technique [0002] In order to ensure the safe operation and normal heat supply of the heat exchange unit, it is necessary to make up water at constant pressure for the heat exchange unit. The constant pressure replenishment method of the heat exchange unit mainly includes the constant pressure of the expansion tank, the constant pressure of the replenishment pump combined with the expansion tank, and the variable frequency and constant pressure of the replenishment pump. Among them, the constant pressure of the expansion tank is open to the atmosphere, and the oxygen in the air is easy to dissolve in the water, which increases the corrosion and aging of the heat exchange unit and the piping system, and reduces the service life. At the highest point, its installation, main...

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Problems solved by technology

Among them, the constant pressure of the expansion tank is open to the atmosphere, and the oxygen in the air is easy to dissolve in the water, which increases the corrosion and aging of the heat exchange unit and the piping system, and reduces the service life. At the highest point, its installation and maintenance management is extremely inconvenient; although the water supply pump combined with the constant pressure of the expansion tank avoids the trouble of placing the expansion tank at the highest point, the installation of the expansion tank is relatively large in size, expensive, and occupies a large area. After a period of time, the expansion tank must be inflated. The air bag in the expansion tank is easy to age and will affect the constant pressure effect; the frequency conversion and constant pressure of the water pump is currently the most used method of water replenishment and constant pressure for heat exchange units, although it can play a better role. However, the water replenishment pump still needs to draw water from the expansion tank, which easily enters the oxygen of the outside air and there is a hidden danger of corrosion. Moreover, it occupies a large area and cannot make good use of the water inlet pressure of the expansion tank. energy waste

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