CN220061890U - Constant-pressure water supplementing unit with vacuum degasser - Google Patents

Abstract

The utility model provides a constant pressure moisturizing unit with vacuum degasser, includes diode net return water pipeline, has set gradually first tie point, second tie point, third tie point and circulating water pump sunction inlet along the rivers direction on the diode net return water pipeline, and first tie point is connected with the moisturizing pipeline, has the surge tank through the pipe connection on the moisturizing pipeline between pressure switch and the bleeder solenoid valve, has vacuum degasser through the pipe connection between second tie point and the third tie point. The utility model realizes low-pressure automatic water replenishment through the constant-pressure water replenishing unit, carries out vacuum strong degassing on water with gas through the vacuum degasser, separates out free gas and dissolved gas in circulating water together under a vacuum negative pressure state, prevents air resistance, ensures stable and reliable system operation period, can eliminate cavitation of a water pump, and reduces system operation noise. Oxygen in the water is removed, so that oxygen corrosion can be reduced, and the service life of system equipment can be prolonged.

Description

Constant-pressure water supplementing unit with vacuum degasser

Technical Field

The utility model relates to the field of machinery, in particular to a heating and refrigerating water circulation system, and especially relates to a constant-pressure water supplementing unit with a vacuum degasser.

Background

In a heating and refrigerating water circulation system, a constant-pressure water replenishing unit is commonly utilized to replenish water for a system pipeline. The constant-pressure water supplementing unit is a pressure-stabilizing water supplementing unit and has wide application. When the system is initially operated, the water supplementing pump is started to fill water into the pipe network and the water chamber in the surge tank, redundant water is squeezed into the bag-shaped diaphragm of the surge tank after the system is filled, and the volume of the water chamber of the surge tank is continuously enlarged to compress the air chamber along with the continuous increase of the water quantity, so that the volume of the air chamber is continuously reduced, and the pressure in the tank is continuously increased. When the pressure reaches the high pressure threshold, the pressure switch touches the contact, and the water supplementing pump automatically stops. In the time of automatic stop of the water supplementing pump, the nitrogen extruded by the air chamber has expansion force to extrude the bag-shaped diaphragm, so that the water chamber of the pressure stabilizing tank and the water of the pipe network have certain pressure, and the normal supply of water to users is ensured. Therefore, the volume of the water chamber of the pressure stabilizing tank is continuously reduced, the bag-shaped diaphragm is continuously contracted, when the water in the water chamber of the pressure stabilizing tank is almost used up, the pressure in the tank is also reduced to a low pressure threshold value, at the moment, the pressure switch touches a designed lowest pressure contact, and the water supplementing pump is automatically started, so that the water is filled into a pipe network and the water chamber of the pressure stabilizing tank. So that the water supply system can be ensured to use water repeatedly.

However, some air is inevitably present in the heating and cooling cycle system, and the source thereof is system water supply and pipe network leakage. This part of the gas exists in the system in three forms: in the first form, the gas accumulates in the form of gas clusters at high points or local high points in the system, such as at the corners of pipes, at the top of heat exchangers, etc. In the second form, the gas circulates with the water in the system in free bubbles. In a third form, the gas is dissolved in water and moves with the water circulation. Air existing in water can bring a lot of adverse effects to heating and refrigeration water circulation system, accumulated gas produces air resistance, causes unbalanced system resistance, and system circulation is unsmooth, produces noise, cavitation and air blockage, and these problems can reduce effective lift and operating efficiency of water pump, reduce the life of equipment and pipeline, and the bubble attached on heat exchanger surface can reduce its heat transfer efficiency, and system air resistance causes system debugging difficulty, and often needs manual exhaust in the operation period. Oxidation in the system can cause oxygen corrosion of the system, corrosion leads to the reduction of the service life of the system, and perforation and water leakage directly affect the safety of the whole system.

Disclosure of Invention

The utility model aims to provide a constant-pressure water supplementing unit with a vacuum degasser, which aims to solve the technical problems that the normal operation of a system is influenced, the operation efficiency is reduced and the service life is shortened due to gas existing in pipeline water of a heating and refrigerating circulation system in the prior art.

The utility model relates to a constant-pressure water supplementing unit with a vacuum degasser, which comprises a diode network water return pipeline, wherein a first connecting point, a second connecting point, a third connecting point and a circulating water pump suction inlet are sequentially arranged on the diode network water return pipeline along the water flow direction, the first connecting point is connected with a water supplementing pipeline, an inlet butterfly valve, a water supplementing pump, a flexible connection, a check valve, an outlet butterfly valve, a pressure switch, a water draining electromagnetic valve, a safety valve and a manual water draining valve are sequentially arranged on the water supplementing pipeline along the water flow direction, a pressure stabilizing tank is connected on the water supplementing pipeline between the pressure switch and the water draining electromagnetic valve through a pipeline, and the vacuum degasser is connected between the second connecting point and the third connecting point through a pipeline;

the constant-pressure water supplementing unit also comprises an electric control cabinet, wherein a controller is arranged in the electric control cabinet, and the control ends of the water supplementing pump, the water draining electromagnetic valve and the vacuum degasser and the output end of the pressure switch are connected with the controller.

Compared with the prior art, the utility model has positive and obvious effects. When the unit operates, the system realizes low-pressure automatic water supplementing through the constant-pressure water supplementing unit, and overflows automatically, so that the pressure of the system is constant within a set range. The water with gas is subjected to vacuum strong degassing through the vacuum degasser, free gas and dissolved gas in the circulating water are separated out together under the vacuum negative pressure state, so that air resistance is prevented, stability and reliability during normal operation of the system are ensured, cavitation of a water pump can be eliminated, and operation noise of the system is reduced. Oxygen in the water is removed, so that oxygen corrosion can be reduced, and the service life of system equipment can be prolonged. In addition, the surface of the heat exchanger is not attached with gas bubbles, so that the heat transfer efficiency is improved. The vacuum degasser is vacuum degassing deoxidization, and does not have any secondary pollution problem. The device is simple and convenient to install, safe and reliable to operate and easy to repair and maintain.

Drawings

Fig. 1 is a schematic diagram of a constant pressure water replenishing unit with a vacuum degasser.

Fig. 2 is a schematic structural diagram of a constant-pressure water replenishing unit with a vacuum degasser.

Description of the embodiments

The present utility model is further described below with reference to the drawings and examples, but the present utility model is not limited to the examples, and all the similar structures and similar variations using the present utility model should be included in the protection scope of the present utility model. The use of the directions of up, down, front, back, left, right, etc. in the present utility model is only for convenience of description, and is not a limitation of the technical scheme of the present utility model.

As shown in fig. 1 and 2, the constant-pressure water supplementing unit with the vacuum degasser comprises a diode network water return pipeline 15, wherein a first connecting point 16, a second connecting point 17, a third connecting point 18 and a circulating water pump suction inlet 14 are sequentially arranged on the diode network water return pipeline 15 along the water flow direction, the first connecting point 16 is connected with a water supplementing pipeline 19, an inlet butterfly valve 1, a water supplementing pump 4, a flexible connection 5, a check valve 6, an outlet butterfly valve 7, a pressure switch 9, a water draining solenoid valve 8, a safety valve 11 and a manual water draining valve 13 are sequentially arranged on the water supplementing pipeline 19 along the water flow direction, a pressure stabilizing tank 10 is connected on the water supplementing pipeline 19 between the pressure switch 9 and the water draining solenoid valve 8 through pipelines, and the vacuum degasser 3 is connected between the second connecting point 17 and the third connecting point 18 through pipelines;

the constant-pressure water supplementing unit also comprises an electric control cabinet 2, wherein a controller is arranged in the electric control cabinet 2, and the water supplementing pump 4, the water draining electromagnetic valve 8, the control end of the vacuum degasser 3 and the output end of the pressure switch 9 are all connected with the controller.

Specifically, the inlet butterfly valve 1, the water replenishment pump 4, the flexible connection 5, the check valve 6, the outlet butterfly valve 7, the pressure switch 9, the water draining solenoid valve 8, the safety valve 11, the manual water draining valve 13, the surge tank 10, the vacuum degasser 3 and the like in this embodiment all adopt the known schemes in the prior art, and those skilled in the art will understand that the description is omitted herein.

The working principle of the embodiment is as follows:

after the unit is installed in the system, water flows in from the inlet of the water supplementing pipeline 19, passes through the inlet butterfly valve 1, the water supplementing pump 4, the flexible connection 5, the check valve 6 and the outlet butterfly valve 7, and then is divided into two paths, one path flows into the water chamber of the pressure stabilizing tank 10, and the other path flows into the water returning pipeline 15 of the diode network from the outlet of the water supplementing pipeline 19, so that water is injected and supplemented into the system. When the system is filled with water, excess water is squeezed into the bladder-shaped diaphragm of the surge tank 10, and as the amount of water increases, the volume of the water chamber of the surge tank 10 increases and compresses the air chamber, thereby reducing the volume and increasing the pressure in the surge tank 10. When the pressure reaches the high pressure threshold, the pressure switch 9 sends a signal to the controller after touching the high pressure contact, and the controller controls the water supplementing pump 4 to stop. In the time when the water supplementing pump 4 stops operating, since the compressed nitrogen in the air chamber of the surge tank 10 has an expansion force, the bag-shaped diaphragm is compressed, so that the water chamber of the surge tank 10 and the water in the pipe network have a certain pressure, and the pressure is used for ensuring normal supply of water to users. After water is supplied, the volume of the water chamber of the pressure stabilizing tank 10 is continuously reduced, the bag-shaped diaphragm is continuously contracted, when the water in the water chamber of the pressure stabilizing tank 10 is almost used up, the pressure in the pressure stabilizing tank 10 is also reduced to a low pressure threshold value, the pressure switch 9 sends a signal to the controller after touching the lowest pressure contact, the controller controls the water supplementing pump 4 to be started, water is supplemented into the pipe network and the water chamber of the pressure stabilizing tank 10, and the water consumption of the system is ensured. The vacuum degasser 3 on the unit is connected to the water return pipeline 15 of the diode network and is connected to the front of the suction inlet 14 of the circulating water pump, so that the gas in the circulating water of the pipe network can be removed better. The principle of the vacuum degasser 3 is based on henry's law: at a certain temperature and pressure, a certain amount of gas is dissolved in the water, and when the temperature is increased or the pressure is reduced, the dissolved gas in the water is reduced. The utility model generates vacuum through the vacuum degasser 3 without changing the water temperature, releases free gas and dissolved gas in the water, and then is discharged out of the system through the automatic exhaust valve in the water supply pipeline system. The degassed unsaturated water seeks gas-water equilibrium for the gas in the absorption system. And all gases in the system water are removed by circulation, so that the stable and safe operation of the system is ensured.

When the unit operates, the system realizes low-pressure automatic water supplementing through the constant-pressure water supplementing unit, and overflows automatically, so that the pressure of the system is constant within a set range. The water with gas is subjected to vacuum strong degassing through the vacuum degasser 3, free gas and dissolved gas in the circulating water are separated out together under the vacuum negative pressure state, so that air resistance is prevented, stable and reliable operation period of the system is ensured, cavitation of a water pump can be eliminated, and operation noise of the system is reduced. Oxygen in the water is removed, so that oxygen corrosion can be reduced, and the service life of system equipment can be prolonged. In addition, the surface of the heat exchanger is not attached with gas bubbles, so that the heat transfer efficiency is improved. The vacuum degasser is vacuum degassing deoxidization, and does not have any secondary pollution problem. The device is simple and convenient to install, safe and reliable to operate and easy to repair and maintain.

Claims (1)

1. Constant pressure moisturizing unit with vacuum degasser, including diode network return water pipeline (15), its characterized in that: the device is characterized in that a first connecting point (16), a second connecting point (17), a third connecting point (18) and a circulating water pump suction inlet (14) are sequentially arranged on a diode network water return pipeline (15) along the water flow direction, the first connecting point (16) is connected with a water supplementing pipeline (19), an inlet butterfly valve (1), a water supplementing pump (4), a flexible connection (5), a check valve (6), an outlet butterfly valve (7), a pressure switch (9), a water draining electromagnetic valve (8), a safety valve (11) and a manual water draining valve (13) are sequentially arranged on the water supplementing pipeline (19) along the water flow direction, a pressure stabilizing tank (10) is connected to the water supplementing pipeline (19) between the pressure switch (9) and the water draining electromagnetic valve (8) through pipelines, and a vacuum degasser (3) is connected between the second connecting point (17) and the third connecting point (18) through pipelines;

the constant-pressure water supplementing unit also comprises an electric control cabinet (2), wherein a controller is arranged in the electric control cabinet (2), and the water supplementing pump (4), the water draining electromagnetic valve (8), the control end of the vacuum degasser (3) and the output end of the pressure switch (9) are all connected with the controller.