Energy-saving liquid ring vacuum pump system

Abstract

The utility model relates to an energy-saving liquid ring vacuum pump system which comprises a liquid ring vacuum pump and a working liquid storage tank, and an air suction groove of the liquid ring vacuum pump is connected with an air inlet and is connected with an air inlet main valve through an air inlet connecting pipe; an exhaust groove of the liquid ring vacuum pump is connected with an exhaust port and is connected with a working liquid storage tank through an exhaust port connecting pipe, and an axial flow cooling fan, a flow guide ring and a working liquid spraying device are arranged in the working liquid storage tank; a circular air inlet hole is formed in the top of a box body of the working liquid storage box, an annular air inlet flow guide ring is arranged in the air inlet hole, the top of the flow guide ring is arranged on the inner wall of the air inlet hole in the top face of the box body of the working liquid storage box, and the bottom of the flow guide ring faces the interior of the working liquid storage box. An axial flow cooling fan is further arranged on the top face of the interior of the working liquid storage box and arranged on the upper portion of the interior of the flow guide ring. And a working solution spraying device is arranged below the axial flow cooling fan.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid ring vacuum pumps, in particular to an energy-saving liquid ring vacuum pump system. Background Art

[0002] Liquid ring vacuum pump is the most widely used vacuum pump in industry at present. It is widely used due to its simple structure, low failure rate, good reliability, easy maintenance and many other advantages. Figure 1 Liquid ring vacuum pumps typically use water as their working fluid. When used to pump chemical gases, these gases mix with the working fluid. Disposal of this working fluid requires significant investment, increasing unit production costs. To meet widespread user demand for energy-efficient and environmentally friendly vacuum equipment, traditional liquid ring vacuum pumps must be innovatively upgraded. Consequently, there is an urgent need for an energy-saving liquid ring vacuum pump system that conserves water resources, reduces wastewater discharge, and offers low cost and energy consumption. Summary of the Invention

[0003] The purpose of the present invention is to overcome the above-mentioned shortcomings and provide an energy-saving liquid ring vacuum pump system, which can achieve significant energy-saving, water-saving and emission-reducing effects.

[0004] The purpose of this utility model is achieved in this way:

[0005] An energy-saving liquid ring vacuum pump system comprises a liquid ring vacuum pump and a working fluid storage tank, the liquid ring vacuum pump and the working fluid storage tank being arranged on a base; an air suction groove and an air exhaust groove are provided on an end cover at one end of the liquid ring vacuum pump; the air suction groove of the liquid ring vacuum pump is connected to an air inlet, a check valve is provided on the air inlet, the check valve is connected to an air inlet connecting pipe, and is connected to an air inlet main valve through the air inlet connecting pipe; the exhaust groove of the liquid ring vacuum pump is connected to an exhaust port, the exhaust port is connected to an exhaust port connecting pipe, and is connected to the working fluid storage tank through the exhaust port connecting pipe, and an axial flow cooling fan, a guide ring and a working fluid spraying device are provided in the working fluid storage tank;

[0006] A circular air inlet hole is provided on the top of the working fluid storage tank, and a circular air inlet guide ring is provided in the air inlet hole. The top of the guide ring is provided on the inner wall of the air inlet hole on the top surface of the working fluid storage tank, and the bottom faces the interior of the working fluid storage tank. An axial flow cooling fan is also provided on the inner top surface of the working fluid storage tank, and the axial flow cooling fan is provided on the upper inner part of the guide ring; a working fluid spraying device is provided below the axial flow cooling fan;

[0007] The working fluid spraying device comprises a long main pipe, on which are provided a plurality of annular branch pipes arranged in a concentric circle with gradually increasing diameters, each branch pipe being provided with a plurality of evenly distributed water outlet nozzles; one end of the main pipe is an inlet, which is connected to the exhaust port through an exhaust port connecting pipe;

[0008] One side of the bottom of the working liquid storage tank is connected to a liquid ring vacuum pump through a liquid inlet pipe, and the liquid ring vacuum pump and the working liquid storage tank are respectively connected to a working liquid vent pipe.

[0009] Furthermore, a mechanical seal is provided on the protruding end of the main shaft of the liquid ring vacuum pump, and the protruding end is connected to the main shaft of the motor through a coupling.

[0010] Furthermore, a vacuum gauge is provided on the air inlet connecting pipe.

[0011] Furthermore, a filter, a thermometer and a working fluid inlet valve are sequentially provided on the liquid inlet pipe between the working fluid storage tank and the liquid ring vacuum pump. The filter is arranged close to the working fluid storage tank, and the working fluid inlet valve is arranged close to the liquid ring vacuum pump.

[0012] Furthermore, the liquid ring vacuum pump is connected to the working fluid vent pipe via a vacuum pump vent valve, and the bottom of the working fluid storage tank 13 is connected to the working fluid vent pipe via a liquid storage tank vent valve.

[0013] Furthermore, a liquid level gauge is provided on one side of the middle portion of the working fluid storage tank for controlling the liquid level during working fluid replenishment and normal operation.

[0014] Furthermore, a pH value detector for measuring the contamination degree of the working fluid is provided at the bottom of the working fluid storage tank.

[0015] Furthermore, an exhaust port or an air outlet is provided on the top of the working fluid storage tank, and a liquid replenishing port is provided on the upper part of the working fluid storage tank.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] The utility model provides an energy-saving liquid ring vacuum pump system. When the liquid ring vacuum pump is working, the compressed gas will cause the working fluid in the pump chamber to heat up rapidly. The working fluid temperature has a significant impact on the performance of the liquid ring vacuum pump. If the working fluid temperature is too high, the vaporization pressure of the working fluid will increase, thereby affecting the vacuum pump's pumping efficiency. Usually, the hot working fluid is discharged into the atmosphere through the vacuum pump's exhaust port together with the pumped gas of the vacuum pump. This consumes a large amount of water resources, and the cost of treating industrial wastewater is quite high. The consumption of large amounts of water resources is the biggest drawback of the liquid ring vacuum pump. Therefore, the utility model continuously replenishes the liquid ring vacuum pump with fresh cooling working fluid by providing a working fluid storage tank and a working fluid spraying device, thereby quickly cooling the working fluid, improving the pumping efficiency of the liquid ring vacuum pump, and extending the service life of the liquid ring vacuum pump; and utilizing ambient air for forced cooling to save energy, reduce emissions, and reduce consumption.

[0018] The utility model has uniform air suction, stable and reliable operation, simple operation and convenient maintenance, forming a fully automatic, internal circulation, low-cost, low-energy consumption, water-saving and low-emission liquid ring vacuum pump system. Compared with the cumbersome and high-investment method currently on the market that uses a shell and tube heat exchanger plus a chiller to cool the working fluid of the liquid ring vacuum pump, the utility model adopts a forced air cooling method, which has a simple structure and high efficiency; the equipment investment cost is lower, the operating energy consumption is lower, and it has better energy-saving and water-saving effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a structural schematic diagram of an existing liquid ring vacuum pump.

[0020] Figure 2 This is a schematic diagram of the system structure of the utility model.

[0021] Figure 3 This is a structural diagram of the working fluid spraying device of the present utility model.

[0022] in:

[0023] Liquid ring vacuum pump 1, check valve 2, vacuum gauge 3, air inlet main valve 4, air inlet connecting pipe 5, exhaust port connecting pipe 6, thermometer 7, filter 8, axial flow cooling fan 9, guide ring 10, working fluid spray device 11, main pipe 11.1, branch pipe 11.2, water outlet nozzle 11.3, liquid level gauge 12, working fluid storage tank 13, pH value tester 14, working fluid vent pipe 15, liquid storage tank vent valve 16, vacuum pump vent valve 17, working fluid inlet valve 18. DETAILED DESCRIPTION

[0024] To better understand the technical solution of the present invention, the following detailed description is provided with reference to the relevant illustrations. It should be understood that the following specific embodiments are not intended to limit the specific implementation of the technical solution of the present invention; they are merely examples of possible implementations of the technical solution of the present invention. It should be noted that the description herein of the positional relationships of the various components, such as component A being located above component B, is based on the relative positions of the components in the illustrations and is not intended to limit the actual positional relationships of the components. Example 1

[0025] See also Figure 2-Figure 3 , Figure 2 The schematic diagram of the structure of the present invention is drawn. As shown in the figure, the present invention relates to an energy-saving liquid ring vacuum pump system, which includes a liquid ring vacuum pump 1 and a working fluid storage tank 13, wherein the liquid ring vacuum pump 1 and the working fluid storage tank 13 are arranged side by side on the same base.

[0026] An air suction groove and an air exhaust groove are provided on the end cover at one end of the liquid ring vacuum pump 1. The air suction groove is connected to the air inlet on the machine base outside the end cover of the liquid ring vacuum pump 1, and the air exhaust groove is connected to the air exhaust port on the machine base outside the end cover of the liquid ring vacuum pump 1; a mechanical seal is provided on the protruding end of the main shaft of the liquid ring vacuum pump 1, and the protruding end is connected to the main shaft of the motor through a coupling.

[0027] The suction groove of the liquid ring vacuum pump 1 is connected to the air inlet, which is provided with a check valve 2. The check valve 2 is connected to the air inlet connecting pipe 5, which is connected to the air inlet main valve 4 through the air inlet connecting pipe 5. The air inlet connecting pipe 5 is provided with a vacuum gauge 3.

[0028] The exhaust groove of the liquid ring vacuum pump 1 is connected to the exhaust port, which is connected to the exhaust port connecting pipe 6, and is connected to the working fluid storage tank 13 through the exhaust port connecting pipe 6. The working fluid storage tank 13 is provided with an axial flow cooling fan 9, a guide ring 10 and a working fluid spraying device 11.

[0029] The working fluid storage tank 13 is a rectangular semi-enclosed box with a circular air inlet hole on the top of the box. A circular air inlet guide ring 10 is arranged in the air inlet hole. The top of the guide ring 10 is arranged on the inner wall of the air inlet hole on the top surface of the working fluid storage tank 13, and the bottom faces the interior of the working fluid storage tank 13. An axial flow cooling fan 9 is also provided on the inner top surface of the working fluid storage tank 13. The axial flow cooling fan 9 is arranged on the upper inner part of the guide ring 10; a working fluid spraying device 11 is provided below the axial flow cooling fan 9.

[0030] The working fluid spraying device 11 includes a long main pipe 11.1, on which three annular branch pipes 11.2 are arranged in concentric circles with gradually increasing diameters. Each branch pipe 11.2 is provided with a number of evenly distributed water outlet nozzles 11.3; one end of the main pipe 11.1 is an inlet, which is connected to the exhaust port through the exhaust port connecting pipe 6.

[0031] The working fluid reservoir 13 has an exhaust or air outlet at its top and a refill port at its upper portion. The bottom of the working fluid reservoir 13 is connected to the liquid ring vacuum pump 1 via a liquid inlet pipe. This inlet pipe is sequentially provided with a filter 8, a thermometer 7, and a working fluid inlet valve 18. The filter 8 is positioned near the working fluid reservoir 13, and the working fluid inlet valve 18 is positioned near the liquid ring vacuum pump 1. The filter 8 is used to filter foreign matter and impurities from the working fluid, preventing mechanical damage to the liquid ring vacuum pump that could affect its normal operation. The filter 8 is removable and washable, ensuring long-term, safe use with regular cleaning. The thermometer 7 is used to control the working fluid temperature required by the liquid ring vacuum pump. When the working fluid temperature is high, the PLC control system increases the fan operating frequency; otherwise, the fan operating frequency is reduced.

[0032] The liquid ring vacuum pump 1 is connected to the working fluid vent pipe 15 through a vacuum pump vent valve 17 , and the bottom of the working fluid storage tank 13 is connected to the working fluid vent pipe 15 through a liquid storage tank vent valve 16 , and the end of the working fluid vent pipe 15 is a working fluid vent port.

[0033] A liquid level gauge 12 is provided on one side of the middle portion of the working fluid storage tank 13 for controlling the liquid level during working fluid replenishment and normal operation; a pH value detector 14 is provided at the bottom of the working fluid storage tank 13 for measuring the degree of contamination of the working fluid, so that the working fluid is always controlled within a normal concentration range, thereby ensuring the pumping performance of the liquid ring vacuum pump.

[0034] The axial flow cooling fan 9 is driven by a variable frequency motor.

[0035] The present utility model discloses an energy-saving liquid ring vacuum pump system, comprising a liquid ring vacuum pump, a working fluid reservoir, a working fluid spray device, an axial flow cooling fan, a working fluid circulation device, a working fluid discharge device, an integral machine base, a pH value monitor, and a PLC control system. All of these components can be integrated onto a common base to form a skid. The working fluid reservoir is mounted on the system base and connected to the liquid ring vacuum pump via an exhaust pipe and a working fluid pipe, respectively. The system can be deployed in a fixed location or configured as a mobile skid. The liquid ring vacuum pump, working fluid reservoir, working fluid cooling spray device, and axial flow cooling fan are connected together via intake and exhaust connecting pipes and working fluid connecting pipes. The pumped gas is sucked into the liquid ring vacuum pump through the main valve of the air inlet and the air inlet pipe. It is compressed after mixing with the working fluid in the liquid ring vacuum pump and enters the exhaust port connecting pipe and then passes through the working fluid spray device. The working fluid is forced to cool down by the axial flow cooling fan on the top of the liquid storage tank and then enters the working fluid storage tank. The pumped gas is discharged to the atmosphere through the exhaust port on the side of the liquid storage tank. The cooled working fluid enters the liquid storage tank and is recycled by the liquid ring vacuum pump again. The fan blows the ambient atmospheric cold air from the outside to the inside through the guide ring to the working fluid spray device. The cold air takes away the heat of the working fluid and completes the cooling of the working fluid. The cooled working fluid falls from top to bottom into the working fluid storage tank under the action of gravity.

[0036] Working principle:

[0037] The present utility model provides an energy-saving liquid ring vacuum pump system, which includes a liquid ring vacuum pump, a coupling, an electric motor, an axial cooling fan, a circulating working fluid storage tank, a working fluid spraying device, a liquid level gauge, a thermometer, a vacuum gauge, an air inlet main valve, a check valve, an air inlet connecting pipe, an exhaust connecting pipe, a working fluid connecting pipe, a filter, various valves, a working fluid draining pipe, a pH value detector, and a PLC intelligent control cabinet. The above equipment can be integrated into a containerized skid. The entire liquid ring vacuum pump system can be arranged for use in a fixed site, or it can be made into a mobile skid for use. The utility model can realize fully automatic monitoring and operation through an intelligent PLC control system and various detectors, and can realize automatic opening and closing, automatic liquid replenishment, automatic liquid drainage, automatic overheating, overload, and interruption protection functions.

[0038] The working principle of a liquid ring vacuum pump involves a multi-blade rotor eccentrically mounted within a cylindrical pump casing. As the rotor rotates, the working fluid (usually water) is thrown toward the inner ring of the pump casing by the centrifugal force of the rotation, forming a rotating liquid ring concentric with the inner ring of the pump casing. This rotating liquid ring and the rotor blades work together to form a rotary variable displacement vacuum pump with a periodic volume change. During the working process of the liquid ring vacuum pump, the pumped gas passes through the air inlet on the intake and exhaust base at one end of the liquid ring vacuum pump and then enters the vacuum pump through the suction groove in the end cover on one side of the pump casing. The pumped gas is compressed by the interaction between the liquid ring and the rotor blades. When the impeller rotates to the exhaust groove position, the working fluid and the pumped gas are compressed to the exhaust port of the vacuum pump through the exhaust groove. The working fluid and gas are discharged into the working fluid spray device through the exhaust connecting pipe, and then the working fluid nozzle sprays the working fluid into the liquid storage tank in a fine rain. At the same time, the axial flow fan at the top continuously inputs the ambient low-temperature air into the liquid storage tank to force-cool the high-temperature working fluid. The cooled working fluid flows back from top to bottom to the bottom of the liquid storage tank to be recycled by the liquid ring vacuum pump. Through this continuous suction, continuous discharge, continuous cooling and continuous reuse of the working fluid, the working fluid can greatly save the working fluid discharge of the liquid ring vacuum pump, reduce the waste of water resources, and reduce the discharge and treatment of sewage. It not only reduces the possibility of environmental pollution, but also greatly reduces the cost of use and effectively controls the operating performance of the vacuum pump.

[0039] The check valve of this system can prevent the working fluid in the pump chamber of the liquid ring vacuum pump from flowing back into the vacuum device in front of the vacuum pump when the liquid ring vacuum pump is shut down; the vacuum gauge is used to monitor the vacuum degree when the vacuum pump is running; the main valve of the air inlet is used to cut off or connect the connection between the liquid ring vacuum pump and the vacuum chamber;

[0040] The exhaust pipe of this system is used to connect the liquid ring vacuum pump and the liquid storage tank. The working fluid and the pumped gas are discharged into the working fluid spray device through the exhaust pipe, and then discharged into the working fluid storage tank through the nozzle on the spray device.

[0041] When the axial flow fan of this system is running, the cold air will not be dispersed when it flows along the guide ring, which is conducive to rapid and efficient heat exchange between the cold air and the working fluid.

[0042] When the liquid ring vacuum pump is working, the working fluid and the pumped gas are sprayed out like a drizzle through the nozzle of the working fluid spray device. The sprayed liquid is quickly cooled by the forced air cooling effect of the cooling fan. The cooled working fluid drips into the liquid storage tank and waits for recycling by the liquid ring vacuum pump.

[0043] The system's axial cooling fan is driven by a variable-frequency motor. Its operating frequency can be adjusted according to the ambient air temperature or the temperature of the working fluid, achieving ideal energy savings. In the summer, when the ambient temperature is relatively high, the working fluid temperature of the liquid ring vacuum pump is relatively high, and the temperature difference between the ambient air temperature and the working fluid is small. In this case, the axial fan can provide high-frequency, strong air cooling for the working fluid. In the winter, when the ambient temperature is relatively low, the temperature difference between the working fluid and the ambient air temperature is large, allowing the axial fan to operate at a low frequency, achieving energy savings.

[0044] The function of the guide ring of this system is to force the cooling air flow to flow in a specified direction, which helps to improve the cooling effect of the working fluid, and can also prevent the working fluid from splashing everywhere and reduce the spraying and loss of the working fluid.

[0045] The pH detector of this system can detect the degree of contamination of the working fluid in real time and control the time of replenishing or replacing fresh working fluid. This can ensure that the waste of working fluid is reduced without affecting the vacuum pump's exhaust performance, further saving water consumption.

[0046] The working fluid spray device of this system consists of three circular branch pipes connected in parallel, each of which is equipped with several water nozzles. When the spray device works, it is similar to a shower head, and the working fluid is dispersed and discharged. In this way, the cooling fan on the top of the spray device can cool the working fluid efficiently and quickly.

[0047] The liquid ring vacuum pump in this system features a simple structure, low manufacturing precision requirements, easy processing, and convenient assembly and maintenance. Its compact design allows for high pump speeds and can be directly coupled to an electric motor without the need for a speed reducer. This results in high displacement with a compact design and a small footprint. The lack of metal friction surfaces within the pump cavity eliminates the need for lubrication and results in minimal wear. The seal between the rotating and stationary parts is achieved directly by a water seal.

[0048] The above are only specific application examples of the present invention and do not constitute any limitation on the scope of protection of the present invention. Any technical solution formed by equivalent transformation or equivalent replacement shall fall within the scope of protection of the present invention.

Claims

1. An energy-saving liquid ring vacuum pump system, characterized by: It comprises a liquid ring vacuum pump (1) and a working fluid storage tank (13), wherein the liquid ring vacuum pump (1) and the working fluid storage tank (13) are arranged on a base; an air suction groove and an air exhaust groove are arranged on an end cover at one end of the liquid ring vacuum pump (1); the air suction groove of the liquid ring vacuum pump (1) is connected to an air inlet, which is provided with a check valve (2); the check valve (2) is connected to an air inlet connecting pipe (5), which is connected to an air inlet main valve (4) through the air inlet connecting pipe (5); the air exhaust groove of the liquid ring vacuum pump (1) is connected to an air exhaust port, which is connected to an air exhaust port connecting pipe (6), which is connected to the working fluid storage tank (13) through the air exhaust port connecting pipe (6); an axial flow cooling fan (9), a guide ring (10) and a working fluid spraying device (11) are arranged in the working fluid storage tank (13); A circular air inlet hole is provided on the top of the working fluid storage tank (13), and a circular air inlet guide ring (10) is provided in the air inlet hole. The top of the guide ring (10) is provided on the inner wall of the air inlet hole on the top surface of the working fluid storage tank (13), and the bottom faces the inside of the working fluid storage tank (13). An axial flow cooling fan (9) is also provided on the inner top surface of the working fluid storage tank (13), and the axial flow cooling fan (9) is provided in the upper inner part of the guide ring (10); a working fluid spraying device (11) is provided below the axial flow cooling fan (9); The working fluid spraying device (11) comprises a long main pipe (11.1), the main pipe (11.1) is provided with a plurality of annular branch pipes (11.2) arranged in a concentric circle with gradually increasing diameters, and each branch pipe (11.2) is provided with a plurality of evenly distributed water outlet nozzles (11.3); one end of the main pipe (11.1) is an inlet, which is connected to the exhaust port via an exhaust port connecting pipe (6); One side of the bottom of the working liquid storage tank (13) is connected to the liquid ring vacuum pump (1) via a liquid inlet pipe, and the liquid ring vacuum pump (1) and the working liquid storage tank (13) are respectively connected to a working liquid vent pipe (15).

2. An energy-saving liquid ring vacuum pump system according to claim 1, characterized in that: A mechanical seal is provided at the protruding end of the main shaft of the liquid ring vacuum pump (1), and the protruding end is connected to the main shaft of the motor via a coupling.

3. The energy-saving liquid ring vacuum pump system according to claim 1, characterized in that: A vacuum gauge (3) is provided on the air inlet connecting pipe (5).

4. The energy-saving liquid ring vacuum pump system according to claim 1, characterized in that: A filter (8), a thermometer (7) and a working liquid inlet valve (18) are sequentially provided on the liquid inlet pipe between the working liquid storage tank (13) and the liquid ring vacuum pump (1), wherein the filter (8) is provided close to the working liquid storage tank (13), and the working liquid inlet valve (18) is provided close to the liquid ring vacuum pump (1).

5. The energy-saving liquid ring vacuum pump system according to claim 1, characterized in that: The liquid ring vacuum pump (1) is connected to the working fluid drain pipe (15) via a vacuum pump drain valve (17), and the bottom of the working fluid storage tank (13) is connected to the working fluid drain pipe (15) via a liquid tank drain valve (16).

6. The energy-saving liquid ring vacuum pump system according to claim 1, characterized in that: A liquid level gauge (12) is provided on one side of the middle portion of the working liquid storage tank (13) for controlling the liquid level during working liquid replenishment and normal operation.

7. The energy-saving liquid ring vacuum pump system according to claim 1, characterized in that: A pH value detector (14) for measuring the degree of contamination of the working fluid is provided at the bottom of the working fluid storage tank (13).

8. The energy-saving liquid ring vacuum pump system according to claim 1, characterized in that: An exhaust port or an air outlet is provided at the top of the working fluid storage tank (13), and a liquid replenishing port is provided at the upper portion of the working fluid storage tank (13).

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