Water recycling device of liquid ring vacuum pump

Abstract

The utility model discloses a liquid ring vacuum pump water recycling device which comprises a liquid ring vacuum pump, a waste gas inlet and a vacuum pump liquid outlet are arranged on the upper end portion of the liquid ring vacuum pump, and a vacuum pump pure water inlet is arranged on the lower end portion of the liquid ring vacuum pump. A liquid outlet of the vacuum pump is connected with the gas-liquid storage and separation tank, a waste gas outlet is formed in the top end of the gas-liquid storage and separation tank, an overflow port and a separation tank liquid outlet are formed in the middle of the gas-liquid storage and separation tank at intervals from top to bottom, and the separation tank liquid outlet is connected with the filter; an automatic water replenishing pipe is connected to the bottom of the gas-liquid storage and separation tank, one end of the automatic water replenishing pipe is located outside the gas-liquid storage and separation tank and connected with an automatic water replenishing pipeline, the other end of the automatic water replenishing pipe is located in the gas-liquid storage and separation tank, and a floating ball water replenishing switch is arranged at an opening; a cooler output opening formed in one side of the cooler is connected with a pure water inlet of the vacuum pump. The device can recycle working liquid and is particularly suitable for the field of plastic manufacturing.

Description

Technical Field

[0001] This utility model relates to the field of water recycling technology for liquid ring vacuum pumps, and in particular to a water recycling device for liquid ring vacuum pumps used in plastic production processes. Background Technology

[0002] A liquid ring vacuum pump is a positive displacement pump that relies on a liquid ring (usually water or other liquids) to achieve gas suction and compression. It utilizes the variable volume cavity formed between the liquid ring and blades as the impeller rotates, using volume changes to achieve gas intake, compression, and discharge. Liquid ring vacuum pumps play a crucial role in plastic production, primarily by optimizing the physical properties and processing environment of plastic products through their vacuum technology. For example, when plastic melts, gases such as air and moisture in the raw material form vapor pockets, leading to porous particles, reduced mechanical strength, and lower surface finish. A liquid ring vacuum pump rapidly removes these gases through a negative pressure environment, making the melt denser and improving product performance.

[0003] However, existing liquid ring vacuum pumps have some problems when applied to plastic production. For example, they cannot achieve automatic liquid recycling within the system, requiring continuous liquid replenishment and waste liquid discharge. Some existing technologies incorporate automatic water replenishment systems and filters to enable automatic liquid recycling, but these systems are not suitable for use in plastic production. This is because during high-temperature processing in plastic production, plastic decomposition produces monomers, oligomers, and other low-molecular-weight volatiles and particulate matter. The negative pressure of the liquid ring vacuum pump helps these harmful substances escape to prevent material degradation and odor generation. However, while the particulate matter can be filtered out by the filter, the low-molecular-weight volatiles float on the liquid surface, making them difficult to remove and hindering automatic liquid recycling within the system. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a liquid ring vacuum pump water recycling device suitable for plastic production and manufacturing processes.

[0005] The technical solution of this utility model is:

[0006] A liquid ring vacuum pump water recycling device, characterized in that it includes a liquid ring vacuum pump, wherein the upper end of the liquid ring vacuum pump is provided with an exhaust gas inlet and a vacuum pump liquid outlet spaced apart, and the lower end of the liquid ring vacuum pump is provided with a vacuum pump pure water inlet;

[0007] The vacuum pump liquid outlet is connected to the gas-liquid storage and separation tank through a conveying pipe. The gas-liquid storage and separation tank is provided with an exhaust gas outlet at the top. The middle part of the gas-liquid storage and separation tank is provided with an overflow outlet and a separation tank liquid outlet spaced apart from top to bottom. The separation tank liquid outlet is connected to a filter through a conveying pipe.

[0008] The bottom of the gas-liquid storage and separation tank is connected to an automatic water supply pipe. One end of the automatic water supply pipe is located outside the gas-liquid storage and separation tank and connected to an automatic water supply pipeline. The other end is located inside the gas-liquid storage and separation tank, and a float water supply switch is provided at its opening.

[0009] The filter is connected to the cooler via a feed pipe, and the cooler outlet on one side of the cooler is connected to the pure water inlet of the vacuum pump via the feed pipe.

[0010] Furthermore, a vacuum pump discharge port is provided on the lower side of the liquid ring vacuum pump, opposite to the pure water inlet of the vacuum pump.

[0011] Furthermore, an exhaust gas pipeline is connected to the exhaust gas outlet, and an exhaust gas fan is installed on the exhaust gas pipeline.

[0012] Furthermore, an overflow pipeline is connected to the overflow outlet, and the overflow pipeline is connected to a wastewater pipeline.

[0013] Furthermore, the float water supply switch includes a float and a valve body mechanism connected to the float. The float floats on the liquid surface of the gas-liquid storage and separation tank, and the valve body mechanism is connected to the opening of the automatic water supply pipe.

[0014] Furthermore, the gas-liquid storage and separation tank is equipped with a liquid level sensor for monitoring the liquid level inside the tank.

[0015] Furthermore, the top of the gas-liquid storage and separation tank is also equipped with a manual water inlet, which is connected to a manual water supply pipeline, and a switch valve is provided at the connection between the two.

[0016] Furthermore, the filter is a basket filter, and the basket filter has a 40-80 mesh basket screen inside.

[0017] The beneficial technical effects of this utility model are:

[0018] First, the gas-liquid storage and separation tank of this invention is equipped with an overflow port for floating matter to escape, which solves the problem that during the high-temperature processing of plastics, low-molecular-weight volatiles become insoluble floating matter when mixed with the liquid and cooled, and are difficult to remove by the filter. Furthermore, the combined use of the float water supply switch and the overflow port allows this invention to automatically adjust the water supply to the gas-liquid storage and separation tank. Second, the combined use of the filter and cooler allows the circulating liquid to remove larger particulate impurities while obtaining the liquid temperature required for the operation of the liquid ring vacuum pump, ultimately realizing the recycling of the liquid in the liquid ring vacuum pump, effectively reducing the liquid consumption and waste liquid discharge of the vacuum pump. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall design of this utility model.

[0020] in:

[0021] 000, Drive motor; 100, Liquid ring vacuum pump; 101, Exhaust gas inlet; 102, Vacuum pump liquid outlet; 103, Vacuum pump pure water inlet; 104, Vacuum pump discharge port; 200, Gas-liquid storage and separation tank; 201, Exhaust gas outlet; 2011, Exhaust gas pipeline; 202, Overflow port; 2021, Overflow pipeline; 2022, Wastewater pipeline; 203, Separator outlet; 204, Automatic water replenishment pipe; 205, Manual water replenishment port; 2051, Manual water replenishment pipeline; 300, Filter; 400, Cooler; 500, Float water replenishment switch; 501, Float; 502, Valve body mechanism. Detailed Implementation

[0022] In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0023] like Figure 1 As shown, this utility model provides a liquid ring vacuum pump water recycling device, which includes a liquid ring vacuum pump 100, a gas-liquid storage and separation tank 200, a filter 300, and a cooler 400.

[0024] The liquid ring vacuum pump 100 is existing technology. It utilizes the variable volume cavity formed between the liquid ring and the blades when the impeller rotates to achieve the intake, compression and discharge of gas through volume changes. The liquid used in the liquid ring vacuum pump 100 shown in this utility model is water.

[0025] The liquid ring vacuum pump 100 is connected to the drive motor 000. A waste gas inlet 101 and a vacuum pump liquid outlet 102 are spaced apart on its top. The vacuum pump liquid outlet 102 is located near the gas-liquid storage and separation tank 200. A vacuum pump pure water inlet 103 and a vacuum pump discharge port 104 are opened opposite each other on the lower end of the liquid ring vacuum pump 100. The vacuum pump pure water inlet 103 is located on the side away from the gas-liquid storage and separation tank 200. Each of the vacuum pump pure water inlet 101, vacuum pump liquid outlet 102, vacuum pump pure water inlet 103, and vacuum pump discharge port 104 is equipped with a switch valve to control its opening or closing.

[0026] Waste gas and particulate matter containing low-molecular-weight volatiles such as monomers and oligomers generated during plastic production enter the liquid ring vacuum pump 100 through the waste gas inlet 101. The waste gas and liquid are then compressed and mixed by the liquid ring vacuum pump 100 and flow out through the vacuum pump liquid outlet 102.

[0027] In addition, when the liquid ring vacuum pump is started, if there is too much liquid inside, the motor connected to it will be overloaded and may trigger the current protection emergency stop. To avoid this situation, this utility model is provided with a vacuum pump discharge port 104, which is used to manually open the vacuum pump discharge port 104 before starting the liquid ring vacuum pump to discharge some of the liquid.

[0028] On the side of the gas-liquid storage separator 200 near the vacuum pump outlet 102 in the middle section, a compressed liquid inlet is provided, and an exhaust gas outlet 201 is provided at the top. The exhaust gas outlet 201 is connected to an exhaust gas pipeline 2011, and an exhaust gas fan is installed on the exhaust gas pipeline 2011. On the other side of the gas-liquid storage separator 200 away from the vacuum pump outlet 102 in the middle section, an overflow outlet 202 and a separator outlet 203 are provided from top to bottom. The overflow outlet 202 is connected to an overflow pipeline 2021, which is connected to a wastewater pipeline 2022. A drainage motor is provided on the wastewater pipeline 2022. The vacuum pump liquid outlet 102 is connected to the compressed liquid inlet on the gas-liquid storage separator 200 through a conveying pipeline, and the separator outlet 203 is connected to the inlet on the filter 300 through a conveying pipeline.

[0029] Furthermore, an automatic water replenishment pipe 204 is connected to the bottom surface of the gas-liquid storage and separation tank 200. One end of the automatic water replenishment pipe 204 is located outside the gas-liquid storage and separation tank 200 and connected to an automatic water replenishment pipeline (not shown), while the other end is located inside the gas-liquid storage and separation tank 200. A float water replenishment switch 500 is provided at the opening. The float water replenishment switch 500 is provided to automatically replenish pure water into the gas-liquid storage and separation tank 200. The structure and working principle of the float water replenishment switch 500 are existing technologies (e.g., Chinese Patent CN 2196672846 U). It includes a float 501 and a valve body mechanism 502 connected to the float 501. The float 501 floats on the liquid surface inside the gas-liquid storage and separation tank 200, and the valve body mechanism 502 is connected to the opening on the automatic water replenishment pipe 204.

[0030] The gas-liquid storage and separation tank 200 is pre-filled with pure water to a certain height, with the water level above the overflow outlet 202. Waste gas, particulate matter, and liquid containing monomers, oligomers, and other low-molecular-weight volatiles, compressed and mixed by the liquid ring vacuum pump 100, flow into the gas-liquid storage and separation tank 200 through the vacuum pump liquid outlet 102. Within the tank 200, the waste gas and liquid are rapidly separated. The lighter waste gas enters the waste gas pipeline 2011 through the waste gas outlet 201 and is then drawn away by the waste gas fan. The liquid is temporarily stored within the tank 200. During the mixing process, the monomers, oligomers, and other low-molecular-weight volatiles are cooled and precipitated. These low-molecular-weight volatiles (i.e., low-melting-point substances) float on the surface of the liquid within the tank 200. The substances floating on the liquid surface are discharged through the overflow outlet 202 into the overflow pipeline 2021, entering the wastewater system. After the liquid is pumped away by the drain motor in pipe 2022, the substance floating on the liquid surface is discharged into the overflow pipe 2021 through the overflow outlet 202. During this process, the liquid level in the gas-liquid storage and separation tank 200 continuously drops. When the liquid level in the gas-liquid storage and separation tank 200 drops, the float 501 also moves downward with the liquid level. When the liquid level in the gas-liquid storage and separation tank 200 is lower than the overflow outlet 202, the float 501 descends and drives the valve body mechanism 502 to open. At this time, the opening of the automatic water supply pipe 204 in the gas-liquid storage and separation tank 200 is connected to the automatic water supply pipe, and the automatic water supply pipe starts to supply water to the gas-liquid storage and separation tank 200. When the liquid level in the gas-liquid storage and separation tank 200 rises to the overflow outlet, the float rises with the liquid level and drives the valve body mechanism 502 to close. The opening of the automatic water supply pipe 204 in the gas-liquid storage and separation tank 200 is blocked, and the automatic water supply pipe stops supplying water to the gas-liquid storage and separation tank 200. Meanwhile, due to pressure and gravity, the liquid in the gas-liquid storage and separation tank 200 flows from the outlet 203 through the conveying pipe to the filter 300. It should be noted that the rates of the substances floating on the liquid surface discharged from the overflow outlet 202 into the overflow pipe 2021, the flow rate of the liquid in the gas-liquid storage and separation tank 200 from the outlet 203 through the conveying pipe to the filter 300 due to pressure and gravity, and the rate of water replenishment from the automatic water replenishment pipe 204 into the gas-liquid storage and separation tank 200 are all reasonable to satisfy the dynamic balance of this utility model device.

[0031] Preferably, the gas-liquid storage separator 200 is also equipped with a manual water inlet 205 at the top, and a manual water supply line 2051 is connected to the manual water inlet 205, with a switch valve at the connection point. When the float water supply switch 500 malfunctions, the switch valve can be manually opened to allow the manual water supply line 2051 to supply pure water to the gas-liquid storage separator 200 through the manual water inlet 205, or the switch valve can be manually closed to stop the supply of pure water to the gas-liquid storage separator 200.

[0032] Preferably, the gas-liquid storage separator 200 is also equipped with a liquid level sensor for monitoring the liquid level inside the gas-liquid storage separator 200.

[0033] The filter 300 of this utility model is a basket filter, which has a 60-mesh basket filter screen inside, and can filter insoluble particulate impurities with a diameter greater than 0.25mm in the liquid.

[0034] The outlet on the other side of the filter 300 is connected to the cooler 400 via a conveying pipe, and the cooler outlet on one side of the cooler 400 is connected to the pure water inlet 103 of the vacuum pump via a conveying pipe.

[0035] After being filtered by filter 300, the liquid continues to flow downwards to cooler 400 due to gravity. Cooler 400 is connected to cooling water (the temperature of the cooling water can be adjusted independently). After the filtered liquid enters the tubes inside the cooler, it fully exchanges heat with the cooling water. After the liquid temperature drops to the liquid operating temperature required by the liquid ring vacuum pump 100, the liquid flows into the pure water inlet 103 of the vacuum pump through the cooler outlet and then into the liquid ring vacuum pump 100, participating in the liquid ring of the liquid ring vacuum pump 100 to realize the recycling of liquid (water) in the liquid ring vacuum pump 100.

[0036] Preferably, all of the above-mentioned material conveying pipelines are equipped with on / off valves.

[0037] The operation process of this utility model is as follows:

[0038] Waste gas and particulate matter containing low-molecular-weight volatiles such as monomers and oligomers generated during plastic production enter the liquid ring vacuum pump 100 through the waste gas inlet 101. After being compressed and mixed by the liquid ring vacuum pump 100, the mixture enters the gas-liquid storage and separation tank 200 for temporary storage. The waste gas and liquid are rapidly separated in the gas-liquid storage and separation tank 200. The lighter waste gas enters the waste gas pipeline 2011 through the waste gas outlet 201 and is then drawn away by the waste gas fan. Meanwhile, the low-molecular-weight volatiles such as monomers and oligomers in the waste gas are cooled and precipitated during the mixing process with the liquid. These low-molecular-weight volatiles (i.e., low-melting-point substances) float on the surface of the liquid in the gas-liquid storage and separation tank 200. The substances floating on the liquid surface are discharged through the overflow outlet 202 into the overflow pipeline 2021, and then into the wastewater pipeline 2022 where they are drawn away by the drainage motor. As the substances floating on the liquid surface are discharged through the overflow outlet 202, the liquid level in the gas-liquid storage and separation tank 200 continuously decreases. As the liquid level in the gas-liquid storage separator 200 decreases, the float 501 moves downwards with the liquid level. When the liquid level in the gas-liquid storage separator 200 is lower than the overflow port 202, the float 501 descends, causing the valve body mechanism 502 to open. At this time, the automatic water supply pipe 204 is connected to the automatic water supply pipeline, and the automatic water supply pipeline starts to supply water to the gas-liquid storage separator 200. When the liquid level in the gas-liquid storage separator 200 rises to the overflow port, the float rises with the liquid level, causing the valve body mechanism 502 to close. The automatic water supply pipeline stops supplying water to the gas-liquid storage separator 200. At the same time, the liquid in the gas-liquid storage separator 200 flows from the separator outlet 203 through the conveying pipeline to the filter 300 due to pressure and gravity. After being filtered by the filter 300, the liquid flows into the cooler 400 and is cooled by heat exchange. Then, it flows into the vacuum pump pure water inlet 103 through the cooler outlet and into the liquid ring vacuum pump 100 to realize the automatic recycling of liquid (water) in the liquid ring vacuum pump.

[0039] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A liquid ring vacuum pump water recycling device, characterized in that, The system includes a liquid ring vacuum pump (100), wherein the upper end of the liquid ring vacuum pump (100) is provided with an exhaust gas inlet (101) and a vacuum pump liquid outlet (102) spaced apart, and the lower end of the system is provided with a vacuum pump pure water inlet (103). The vacuum pump liquid outlet (102) is connected to the gas-liquid storage and separation tank (200) through a conveying pipe. The gas-liquid storage and separation tank (200) has an exhaust gas outlet (201) at the top. The gas-liquid storage and separation tank (200) has an overflow outlet (202) and a separation tank outlet (203) spaced apart from top to bottom in the middle part. The separation tank outlet (203) is connected to a filter (300) through a conveying pipe. The bottom of the gas-liquid storage separator (200) is connected to an automatic water supply pipe (204). One end of the automatic water supply pipe (204) is located outside the gas-liquid storage separator (200) and connected to an automatic water supply pipeline. The other end is located inside the gas-liquid storage separator (200), and a float water supply switch (500) is provided at its opening. The filter (300) is connected to the cooler (400) through a conveying pipe, and the cooler outlet on one side of the cooler (400) is connected to the pure water inlet (103) of the vacuum pump through a conveying pipe.

2. The liquid ring vacuum pump water recycling device according to claim 1, characterized in that, The liquid ring vacuum pump (100) is provided with a vacuum pump discharge port (104) on the lower side, opposite to the vacuum pump pure water inlet (103).

3. The liquid ring vacuum pump water recycling device according to claim 1, characterized in that, An exhaust gas pipeline (2011) is connected to the exhaust gas outlet (201), and an exhaust gas fan is installed on the exhaust gas pipeline (2011).

4. The liquid ring vacuum pump water recycling device according to claim 1, characterized in that, An overflow pipe (2021) is connected to the overflow outlet (202), and the overflow pipe (2021) is connected to the wastewater pipe (2022).

5. The liquid ring vacuum pump water recycling device according to claim 1, characterized in that, The float water supply switch (500) includes a float (501) and a valve body mechanism (502) connected to the float. The float (501) floats on the liquid surface of the gas-liquid storage separator (200), and the valve body mechanism (502) is connected to the opening of the automatic water supply pipe (204).

6. The liquid ring vacuum pump water recycling device according to claim 1, characterized in that, The gas-liquid storage and separation tank (200) is equipped with a liquid level sensor for monitoring the liquid level inside the gas-liquid storage and separation tank (200).

7. The liquid ring vacuum pump water recycling device according to claim 1, characterized in that, The gas-liquid storage and separation tank (200) is also equipped with a manual water inlet (205) on the top. The manual water inlet (205) is connected to a manual water supply line (2051), and a switch valve is provided at the connection between the two.

8. The liquid ring vacuum pump water recycling device according to claim 1, characterized in that, The filter (300) is a basket filter, and the basket filter is equipped with a 40-80 mesh basket filter screen inside.

9. The liquid ring vacuum pump water recycling device according to claim 1, characterized in that, Each of the conveying pipelines is equipped with a switch valve.

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