Roots water circulation vacuum unit

Abstract

The utility model relates to the field of vacuum units, in particular to a Roots water circulation vacuum unit. The Roots water circulation vacuum unit can dehumidify and cool gas blown into a Roots pump, prevent water vapor from corroding the Roots pump, prolong the service life and improve the vacuumizing efficiency. A Roots water circulation vacuum unit comprises a water ring pump, and the water ring pump is provided with a first air inlet and a first air outlet. The roots pump is provided with a second air inlet and a second air outlet; a first air outlet of the water ring pump is communicated with a second air inlet of the roots pump; a filtering and dehumidifying device used for filtering and dehumidifying gas is further arranged between the first gas outlet of the water ring pump and the second gas inlet of the roots pump. The effects of dehumidifying and cooling the gas blown into the roots pump, preventing water vapor from corroding the roots pump, prolonging the service life and improving the vacuumizing efficiency are achieved.

Description

Technical Field

[0001] The utility model relates to the field of vacuum units, in particular to a Roots water cycle vacuum unit. Background Art

[0002] The operating principle of the Roots water ring vacuum unit is based on a combination of the working principles of the Roots vacuum pump and the water ring vacuum pump. The Roots vacuum pump is a positive displacement vacuum pump that draws gas from the air inlet and compresses it before discharging it through two intermeshing rotors rotating within the pump chamber. The water ring vacuum pump, on the other hand, utilizes the interaction between the water ring and the impeller to draw gas from the air inlet and achieve a vacuum state through the compression and discharge process. In the Roots water ring unit, the water ring pump acts as the backing pump, first creating the preliminary vacuum required by the Roots pump. The Roots pump then further extracts gas on this basis, achieving efficient vacuum extraction.

[0003] With the existing Roots water-circulating vacuum unit, when the humidity of the gas to be pumped is high, or the temperature is high, causing the water in the water ring pump to evaporate and form water vapor, the water vapor will enter the Roots pump and affect the efficiency of the pump's vacuum compression. It will also cause corrosion to its internal components, shortening the service life of the Roots pump. Therefore, it is urgent to develop a Roots water-circulating vacuum unit that can dehumidify and cool the gas blown into the Roots pump, prevent it from being corroded by water vapor, and improve its service life and vacuum efficiency. Utility Model Content

[0004] In order to overcome the shortcomings of the existing Roots water circulation vacuum unit, when the humidity or temperature of the pumped gas is high, water vapor enters the Roots pump, which affects the efficiency of the pump's vacuum compression and also causes corrosion to its internal components, thereby shortening the service life of the Roots pump. The technical problem to be solved by the utility model is to provide a Roots water circulation vacuum unit that can dehumidify and cool the gas blown into the Roots pump, prevent the gas from being corroded by water vapor, and thereby improve the service life and vacuuming efficiency.

[0005] The present invention is achieved by the following specific technical means:

[0006] A Roots water circulation vacuum unit includes a water ring pump, the water ring pump is provided with a first air inlet and a first air outlet; a Roots pump is provided at one end of the first air outlet of the water ring pump, and the Roots pump is provided with a second air inlet and a second air outlet; the first air outlet of the water ring pump is connected to the second air inlet of the Roots pump;

[0007] A filtering and dehumidifying device for filtering and dehumidifying the gas is also provided between the first air outlet of the water ring pump and the second air inlet of the Roots pump; the filtering and dehumidifying device includes a connecting pipe, and both ends of the connecting pipe are connected to the first air outlet of the water ring pump and the second air inlet of the Roots pump through flanges respectively; a filter is fixedly provided on the side of the connecting pipe close to the water ring pump; an evaporator is fixedly provided on the side of the connecting pipe close to the Roots pump; a compressor is provided on the outside of the connecting pipe, and a condenser is provided on the side of the compressor; the evaporator, the compressor and the condenser are interconnected by pipelines; a water receiving pan is also fixedly provided on the lower side of the evaporator provided in the connecting pipe; a water storage tank is also provided on the outside of the connecting pipe; the water receiving pan is connected to the water storage tank through a water supply pipe.

[0008] Furthermore, the compressor is connected to the condenser inlet through a high-pressure liquid pipe, the condenser outlet is connected to the evaporator inlet through a capillary tube, and the evaporator outlet is connected to the variable frequency compressor through a return air pipe; the low-temperature and low-pressure refrigerant gas enters the compressor, and after being compressed by the compressor, becomes a high-temperature and high-pressure liquid refrigerant, releases heat through the condenser, becomes a low-temperature and high-pressure liquid refrigerant, reduces pressure through the capillary tube, becomes a low-temperature and low-pressure liquid refrigerant, evaporates and absorbs heat through the evaporator, becomes a low-temperature and low-pressure refrigerant gas, and enters the compressor for the next cycle.

[0009] Furthermore, the evaporator is tilted to facilitate the water droplets condensed on the evaporator to drip downward to one side along the tilted direction of the evaporator, thereby facilitating the centralized collection of the condensed water droplets.

[0010] Furthermore, the water receiving tray is arranged at the downwardly inclined end of the evaporator, so that the water droplets condensed on the evaporator can drip into the water receiving tray.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] The utility model achieves the effects of dehumidifying and cooling the gas blown into the Roots pump, preventing the gas from being corroded by water vapor, and improving the service life and vacuuming efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic cross-sectional structural diagram of the present utility model.

[0014] Figure 2 This is a schematic cross-sectional view of the filtering and dehumidifying device of the present invention.

[0015] The marks in the accompanying drawings are: 1-water ring pump, 11-first air inlet, 12-first air outlet, 2-Roots pump, 21-second air inlet, 22-second air outlet, 3-filtration and dehumidification device, 31-connecting pipe, 32-filter, 33-evaporator, 34-compressor, 35-condenser, 36-return air pipe, 37-capillary tube, 38-high-pressure liquid pipe, 39-water receiving tray, 310-water storage tank, 311-water supply pipe. DETAILED DESCRIPTION

[0016] The present invention will be further described below with reference to the accompanying drawings: Example

[0017] A Roots water cycle vacuum unit, such as Figure 1-2 As shown, it includes a water ring pump 1, which is provided with a first air inlet 11 and a first air outlet 12; a Roots pump 2 is provided at one end of the first air outlet 12 of the water ring pump 1, and the Roots pump 2 is provided with a second air inlet 21 and a second air outlet 22; the first air outlet 12 of the water ring pump 1 is connected to the second air inlet 21 of the Roots pump 2;

[0018] A filtering and dehumidifying device 3 for filtering and dehumidifying the gas is further provided between the first air outlet 12 of the water ring pump 1 and the second air inlet 21 of the Roots pump 2; the filtering and dehumidifying device 3 includes a connecting pipe 31, both ends of which are connected to the first air outlet 12 of the water ring pump 1 and the second air inlet 21 of the Roots pump 2 through flanges; a filter screen 32 is fixedly provided on the side of the connecting pipe 31 close to the water ring pump 1; an evaporator 33 is fixedly provided on the side of the connecting pipe 31 close to the Roots pump 2; a compressor 34 is provided on the outside of the connecting pipe 31, and the compressor A condenser 35 is provided on one side of 34; the evaporator 33, the compressor 34 and the condenser 35 are interconnected by pipelines; a water receiving pan 39 is fixedly provided on the lower side of the evaporator 33 provided in the connecting pipe 31; a water storage tank 310 is also provided on the outer side of the connecting pipe 31; the water receiving pan 39 is connected to the water storage tank 310 through a water supply pipe 311; the compressor 34 is connected to the inlet of the condenser 35 through a high-pressure liquid pipe 38, the outlet of the condenser 35 is connected to the inlet of the evaporator 33 through a capillary tube 37, and the outlet of the evaporator 33 is connected to the variable frequency compressor 34 through a return air pipe 36.

[0019] Working principle:

[0020] When the vacuum unit of the utility model is working, the water ring pump 1 is first started to reduce the pressure in the system to a certain range, and then the Roots pump 2 is started. The Roots pump 2 continues to compress and discharge the gas until the required vacuum degree is reached. The presence of the water ring pump 1 not only reduces the load of the Roots pump 2, but also improves the overall efficiency and stability of the unit.

[0021] When the humidity of the gas to be pumped is high, or the temperature is high, causing the water in the water ring pump 1 to evaporate, thereby forming water vapor, when the high-humidity gas passes through the filter 32 in the connecting pipe 31, the filter 32 filters the dust particles in the high-humidity gas to prevent the dust particles from clogging the gap between the fins of the evaporator 33, resulting in insufficient heat exchange and frosting. The filtered high-humidity gas then passes through the evaporator 33, and the evaporator 33 cools the gas under the action of the refrigerant, lowering the gas temperature to below the dew point of the air, so that the water exceeding the water content limit of the air is precipitated, and the precipitated water is adsorbed on the aluminum sheet of the evaporator 33 and drips into the water receiving tray 39 below. In the process, the water is transported from the water pipe 311 connected to the water receiving pan 39 to the water storage tank 310; the high-humidity gas passing through the evaporator 33 is converted into low-temperature and low-humidity gas, and the low-temperature and low-humidity gas enters the Roots pump 2 from the second air inlet 21 of the Roots pump 2, and is discharged from the second air outlet 22 of the Roots pump 2 after being compressed; the high-humidity gas is blown into the Roots pump 2 after being dehumidified and cooled, so as to prevent water vapor from corroding its internal components and affecting the service life and vacuum efficiency of the Roots pump 2. At the same time, the low-temperature gas is blown into the Roots pump 2, which can improve the heat dissipation efficiency of the Roots pump 2 and prevent the rotor in the Roots pump 2 from becoming stuck and wearing due to the thermal expansion of the high temperature, resulting in a smaller gap.

[0022] The control method of the present invention is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by technicians in this field. The provision of power is also common knowledge in this field. In addition, the present invention is mainly used to protect mechanical devices, so the control method and circuit connection are no longer explained in detail in the present invention.

[0023] While the present disclosure has been described in detail with reference to exemplary embodiments, the present disclosure is not limited thereto, and it will be apparent to those skilled in the art that various modifications and changes may be made thereto without departing from the scope of the present disclosure.

Claims

1. A Roots water circulation vacuum unit, comprising a water ring pump (1), the water ring pump (1) being provided with a first air inlet (11) and a first air outlet (12); a Roots pump (2) being provided at one end of the first air outlet (12) of the water ring pump (1), the Roots pump (2) being provided with a second air inlet (21) and a second air outlet (22); the first air outlet (12) of the water ring pump (1) being in communication with the second air inlet (21) of the Roots pump (2); It is characterized in that A filtering and dehumidifying device (3) for filtering and dehumidifying the gas is further provided between the first air outlet (12) of the water ring pump (1) and the second air inlet (21) of the Roots pump (2); the filtering and dehumidifying device (3) comprises a connecting pipe (31), both ends of which are connected to the first air outlet (12) of the water ring pump (1) and the second air inlet (21) of the Roots pump (2) through flanges; a filter screen (32) is fixedly provided on one side of the connecting pipe (31) close to the water ring pump (1); a filter screen (32) is fixedly provided on the connecting pipe (31) close to the Roots pump (2) An evaporator (33) is fixedly provided on one side of the pump (2); a compressor (34) is provided on one side of the connecting pipe (31), and a condenser (35) is provided on one side of the compressor (34); the evaporator (33), the compressor (34), and the condenser (35) are interconnected through pipelines; a water receiving pan (39) is also fixedly provided on the lower side of the evaporator (33) provided in the connecting pipe (31); a water storage tank (310) is also provided on one side of the connecting pipe (31); the water receiving pan (39) is communicated with the water storage tank (310) through a water delivery pipe (311).

2. A Roots water cycle vacuum unit according to claim 1, characterized in that: The compressor (34) is connected to the inlet of the condenser (35) through a high-pressure liquid pipe (38), the outlet of the condenser (35) is connected to the inlet of the evaporator (33) through a capillary tube (37), and the outlet of the evaporator (33) is connected to the variable frequency compressor (34) through a return air pipe (36).

3. The Roots water cycle vacuum unit according to claim 1, characterized in that: The evaporator (33) is arranged at an angle.

4. The Roots water cycle vacuum unit according to claim 1, characterized in that: The water receiving tray (39) is arranged at the downwardly inclined end of the evaporator (33).

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