Water ring vacuum pump circulating system for extruder

Abstract

The application relates to an extruder water ring vacuum pump circulating system, and relates to the technical field of cable production equipment. The application discloses an extruder water ring vacuum pump circulating system, which comprises a refrigerant tank, a heat exchanger, a water ring vacuum pump and an oil mist filter. The refrigerant tank is used for storing water medium and comprises a first inlet and a first outlet. The heat exchanger comprises a second inlet and a second outlet, and the first inlet is communicated with the first outlet. The water ring vacuum pump comprises a third inlet, a suction port and a third outlet, the third inlet is communicated with the second outlet, and the third outlet is communicated with the first inlet. The oil mist filter comprises an air inlet and an air outlet, the air inlet is communicated with an exhaust port of the extruder, the air outlet is communicated with the suction port, and the oil mist filter further comprises a blowdown port. The application can effectively prevent oil dirt from adhering to internal components of the pump body, reduce the wear and corrosion risk of the pump body, prolong the service life of the vacuum pump, and guarantee the stability and vacuum degree of long-term operation of the vacuum pump.

Description

Technical Field

[0001] This application relates to the field of cable production equipment technology, and in particular to a water ring vacuum pump circulation system for an extruder. Background Technology

[0002] In the production of cable materials, specialized polymer materials such as insulation and sheathing materials need to be melted, mixed, devolatilized, and granulated using an extruder. During the high-temperature extrusion process, small molecule additives such as plasticizers, lubricants, and antioxidants, as well as the decomposition products of the polymer itself, escape in gaseous form, forming complex low-molecular-weight volatiles. If these volatiles are not removed in time and effectively, they will form microbubbles in the melt, resulting in rough particle surfaces and internal pores in the subsequent granulation process, seriously affecting the dielectric properties, mechanical strength, and long-term service life of the cable material. Water ring vacuum pump devolatilization technology has become a key process to ensure the production of high-quality cable materials because it can provide a stable vacuum environment and has condensation and capture functions. This technology continuously supplies water to the pump chamber, forming a closed water ring under the high-speed rotation of the impeller. On the one hand, it establishes a vacuum negative pressure to draw in volatile gases, and on the other hand, it uses water flow to cool the high-temperature gases, condense and dissolve some organic volatiles.

[0003] Currently, commonly used water ring vacuum pump systems, such as the water recycling device for an extruder water ring vacuum pump disclosed in patent announcement number CN214687870U, construct a water circulation system by setting up a water tank, a tubular cooler, and a chiller, which initially solves the problem of water waste. The technical focus is on circulating and cooling and filtering the contaminated working fluid.

[0004] However, in the existing structure, firstly, the system lacks pretreatment of the exhaust gas source. The oil mist and viscous substances carried in the high-temperature exhaust gas extracted from the extruder directly enter the vacuum pump, which not only contaminates the working fluid and aggravates internal wear of the pump body, but also significantly increases the load on the downstream water treatment unit. Secondly, the filter structure in its water tank is mostly fixed, which is inconvenient to maintain and clean, affecting the filtration efficiency and the long-term stability of the system. Finally, the temperature control accuracy and response speed of the system need to be improved, making it difficult to achieve precise and stable control of the temperature of the water medium entering the pump body, thus failing to optimally balance pump head protection and organic matter condensation efficiency. Utility Model Content

[0005] The purpose of this application is to provide a water ring vacuum pump circulation system for an extruder to solve the problems existing in the prior art.

[0006] To achieve the above objectives, the technical solution adopted in this application is as follows: This application provides a water ring vacuum pump circulation system for an extruder, including a refrigerant tank, a heat exchanger, a water ring vacuum pump, and an oil mist filter. The refrigerant tank is used to store the water medium and includes a first inlet and a first outlet. The heat exchanger includes a second inlet and a second outlet, with the first inlet connected to the first outlet for cooling the water medium from the refrigerant tank. The water ring vacuum pump includes a third inlet, a suction port, and a third outlet, with the third inlet connected to the second outlet and the third outlet connected to the first inlet, for forming a water ring through the cooled water medium and extracting gas. The oil mist filter includes an inlet and an outlet, with the inlet connected to the extruder exhaust port and the outlet connected to the suction port for pre-filtering the gas discharged from the extruder. The oil mist filter also includes a drain port for discharging liquid oil separated from the gas.

[0007] Furthermore, the interior of the oil mist filter is provided with a first filter assembly and a second filter assembly in sequence along the gas flow direction. The first filter assembly includes multiple parallel and staggered baffles so that the gas passes through the multiple baffles in a tortuous manner. The second filter assembly includes a wire mesh assembly.

[0008] Furthermore, a filter box is detachably connected inside the refrigerant box. The filter box includes a filter inlet, a filter outlet, and a filter assembly disposed between the filter inlet and the filter outlet. The filter inlet is connected to the first inlet, the filter outlet is connected to the inner cavity of the refrigerant box, and the filter assembly is used to filter water medium.

[0009] Furthermore, the filtration assembly includes a granular filter layer and an activated carbon adsorption layer arranged sequentially along the direction of water medium flow.

[0010] Furthermore, the particulate filter layer includes stainless steel wire mesh, and the activated carbon adsorption layer includes granular activated carbon.

[0011] Furthermore, the refrigerant box has a maintenance port on its side wall, and the maintenance port has a guide rail. The outer wall of the filter box has a guide groove, which engages with the guide rail. The filter box can slide into or out of the working position of the refrigerant box along the guide rail. A sealing cover is hinged to one end of the maintenance port, and the sealing cover can open or close the maintenance port.

[0012] Furthermore, a waste gas treatment mechanism is connected to the top of the refrigerant box, which is connected to the filter inlet to purify the gas discharged from the water ring vacuum pump.

[0013] Furthermore, a circulating water pump is connected to the pipeline between the first outlet and the second inlet.

[0014] Furthermore, the system also includes a cooling supply mechanism, which includes a replenishment port and a recovery port. The heat exchanger includes a cooling medium inlet and a cooling medium outlet. The replenishment port is connected to the cooling medium inlet, and the recovery port is connected to the cooling medium outlet.

[0015] Furthermore, the system also includes a temperature control mechanism, which includes a temperature sensor and a controller. The temperature sensor is used to detect at least the temperature of the water medium entering the water ring vacuum pump, and the controller is connected to the cooling supply mechanism. The controller is used at least to control the supply of cooling medium to the cooling supply mechanism based on the temperature detected by the temperature sensor, so as to regulate the cooling power of the heat exchanger.

[0016] The beneficial effects of the technical solution provided in this application include at least the following: (1) This application pre-treats the high-temperature gas discharged from the extruder, which contains a large amount of oily volatiles and viscous substances, by setting an oil mist filter between the exhaust port of the extruder and the intake port of the water ring vacuum pump. This prevents the gas from directly entering and contaminating the working chamber and water medium of the water ring vacuum pump, effectively preventing oil stains from adhering to the internal components of the pump body, reducing the risk of wear and corrosion of the pump body, extending the service life of the vacuum pump, and ensuring its long-term operational stability and vacuum level.

[0017] (2) This application connects the refrigerant box, heat exchanger and water ring vacuum pump through pipelines to form a closed water medium circulation loop, realizes the recycling of water resources, greatly reduces the amount of new water consumed by the system, and significantly improves the environmental protection performance. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the present application and form part of the specification. They are used together with the embodiments of the present application to explain the application and do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the structural flow of the cyclic system in one embodiment of the present invention; Figure 2 This is a partial cross-sectional structural diagram of an oil mist filter in one embodiment of the present invention; Figure 3 This is a top view cross-sectional structural diagram of the refrigerant box in one embodiment of this utility model.

[0019] Explanation of key figure labels: 100. Refrigerant box; 110. First inlet; 120. First outlet; 130. Filter box; 131. Filter inlet; 132. Filter outlet; 133. Particulate filter layer; 134. Activated carbon adsorption layer; 140. Maintenance port; 150. Sealing cover; 160. Guide rail; 200. Heat exchanger; 210. Second inlet; 220. Second outlet; 230. Replenishment port; 240. Recovery port; 300. Water ring vacuum pump; 310. Third inlet; 320. Inlet; 330. Third outlet; 400. Oil mist filter; 410. Inlet; 420. Outlet; 430. Drain; 440. First filter assembly; 450. Second filter assembly; 500. Waste gas treatment mechanism; 600. Circulating water pump; 700. Cooling supply mechanism. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0021] In this specification, identical components are represented by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "upper," and "lower" used in the following description refer to directions in the accompanying drawings, while the terms "bottom surface," "top surface," "inner," and "outer" refer to directions towards or away from a specific component, respectively. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this specification, "multiple" means two or more.

[0022] Please see Figures 1-3A water ring vacuum pump circulation system for an extruder includes a refrigerant tank 100, a heat exchanger 200, a water ring vacuum pump 300, and an oil mist filter 400. The refrigerant tank 100 is used to store the water medium and includes a first inlet 110 and a first outlet 120. The heat exchanger 200 includes a second inlet 210 and a second outlet 220, with the first inlet 110 communicating with the first outlet 120 for cooling the water medium from the refrigerant tank 100. The water ring vacuum pump 300 includes a third inlet 310, a suction port 320, and a third outlet. The third inlet 310 is connected to the second outlet 220, and the third outlet 330 is connected to the first inlet 110, for forming a water ring through the cooled water medium and extracting gas; the oil mist filter 400 includes an air inlet 410 and an air outlet 420, the air inlet 410 is connected to the extruder exhaust port, and the air outlet 420 is connected to the suction port 320, for filtering and pre-treating the gas discharged from the extruder, and the oil mist filter 400 also includes a drain port 430, for discharging liquid oil separated from the gas.

[0023] In this embodiment, as Figure 1As shown, the refrigerant box 100 has a rectangular box structure, and its inner cavity can store water medium. A first inlet 110 is provided on the upper part of one side wall of the refrigerant box 100, and a first outlet 120 is provided on the lower part of one side wall. Both the first inlet 110 and the first outlet 120 are connected to the inner cavity. The first inlet 110 is connected to the third outlet 330 of the water ring vacuum pump 300 through a pipe, and the first outlet 120 is connected to the second inlet 210 of the heat exchanger 200 through a pipe. The heat exchanger 200 can be a tubular heat exchanger, which includes a second inlet 210 and a second outlet 220 that allow water to flow through it. The second inlet 210 is connected to the first outlet 120 of the refrigerant tank 100 via a pipe, and the second outlet 220 is connected to the third inlet 310 of the water ring vacuum pump 300 via a pipe. This cools the water medium output from the refrigerant tank 100 before it is output to the water ring vacuum pump 300. The water ring vacuum pump 300 can be a single-stage, single-acting structure with a built-in high-speed rotating impeller. The pump body has a third inlet 310, a suction port 320, and a third outlet 330. The third inlet 310 is located at the bottom of the pump chamber and receives the cooled water medium. The suction port 320 is located on the side of the pump chamber and receives pre-treated exhaust gas. The third outlet 330 is located at the top of the pump chamber and discharges the used water medium and a small amount of uncondensed gas. The third inlet 310 is connected to the second outlet 220 of the heat exchanger 200 via a pipe, and the suction port 320... The third outlet 330 is connected to the first inlet 110 of the refrigerant tank 100 via a pipe, forming a closed-loop water medium circulation. The oil mist filter 400 adopts a cylindrical sealed shell with an air inlet 410 at the top, an air outlet 420 on the upper side wall, and a drain outlet 430 at the bottom. The air inlet 410 is connected to the exhaust port of the extruder via a flange, and the air outlet 420 is sealed to the suction port 320 of the water ring vacuum pump 300 via a pipe.

[0024] In practical operation, low-molecular-weight volatiles (including oil mist and viscous substances) generated during the high-temperature extrusion process of the extruder are discharged from the extruder exhaust port and enter the air inlet 410 of the oil mist filter 400. After being filtered by the oil mist filter 400, the separated liquid oil is collected at the bottom of the housing and periodically discharged through the drain port 430. The pre-treated clean exhaust gas enters the air intake 320 of the water ring vacuum pump 300 from the air outlet 420 of the oil mist filter 400. First, sufficient water medium needs to be added to the refrigerant tank 100. The stored water medium (with an initial temperature consistent with the ambient temperature) flows into the second inlet 210 of the heat exchanger 200 through the first outlet 120. In the heat exchanger 200, the water medium exchanges heat with the cooling medium in the refrigerant channel. The cooled water medium flows out from the second outlet 220 of the heat exchanger 200 and enters the third inlet 310 of the water ring vacuum pump 300 through the pipeline, and is injected into the pump chamber. After the water ring vacuum pump 300 starts, the impeller rotates at high speed, and the water medium is thrown against the pump wall under the action of centrifugal force, forming a closed water ring concentric with the pump body. When the impeller rotates for the first half, the volume of the space between the blades increases, forming a vacuum. The pre-treated waste gas discharged from the outlet 420 of the oil mist filter 400 is drawn in through the suction port 320. At the same time, the low temperature characteristics of the water ring cool the high temperature waste gas, causing the organic volatiles in the waste gas (such as plasticizers and antioxidant decomposition products) to condense into liquid and dissolve or mix in the water medium. After the suction and condensation are completed, the water medium carries a small amount of uncondensed trace gas and is discharged from the third outlet 330 of the pump chamber, and flows back to the first inlet 110 of the refrigerant tank 100 through the pipeline to enter the next cycle. In the above structure, by installing an oil mist filter 400 between the extruder exhaust port and the suction port 320 of the water ring vacuum pump 300, the high-temperature gas discharged from the extruder, containing a large amount of oily volatiles and viscous substances, can be pretreated. This effectively separates and intercepts liquid oil and some solid particles from the source of pollution, preventing them from directly entering and contaminating the working chamber and water medium of the water ring vacuum pump 300. This reduces the load on the subsequent water treatment unit, effectively prevents oil from adhering to the internal components of the pump body, thereby significantly reducing the risk of wear and corrosion of the pump body, extending the service life of the vacuum pump, and ensuring its long-term operational stability and vacuum level. By connecting the refrigerant tank 100, heat exchanger 200, and water ring vacuum pump 300 through pipelines, a closed water medium circulation loop is formed, realizing the recycling of water resources and greatly reducing the system's fresh water consumption. Since most pollutants are trapped in the circulation system, the amount of wastewater to be discharged and the concentration of pollutants in it are effectively controlled, significantly improving environmental performance.

[0025] In the specific structure of the oil mist filter 400, the interior of the oil mist filter 400 is provided with a first filter assembly 440 and a second filter assembly 450 in sequence along the gas flow direction. The first filter assembly 440 includes a plurality of parallel staggered baffles so that the gas passes through the plurality of baffles in a tortuous manner. The second filter assembly 450 includes a wire mesh assembly.

[0026] In this embodiment, as Figure 2 As shown, gas flows from top to bottom within the oil mist filter 400. The first filter assembly 440 and the second filter assembly 450 are arranged vertically in sequence. The first filter assembly 440 includes multiple parallel, staggered baffles arranged in two rows. The upper row of baffles is fixed to the left side of the inner wall of the housing, and the lower row is fixed to the right side. The two rows of baffles are staggered, forming a "Z"-shaped tortuous channel. The air-facing surface of each baffle is frosted to improve oil mist adhesion, and the air-repellent surface has a guide groove to guide the adhered oil downwards. The second filter assembly 450 is located directly below the first filter assembly 440. It includes a wire mesh frame and multiple layers of wire mesh. Multiple layers of stainless steel wire mesh are laid in layers within the wire mesh frame to form a three-dimensional filtration space. The surface is treated with an oleophilic coating to enhance oil mist capture capability. A rubber sealing gasket is provided on the outside of the frame to ensure a tight fit with the inner wall of the housing and prevent gas short-circuiting. A conical oil collection hopper is provided at the bottom of the oil mist filter 400 to facilitate oil collection. The bottom of the oil collection hopper is connected to the drain port 430. The high-temperature exhaust gas from the extruder enters through the air inlet 410 at the top of the casing and first flows into the "Z"-shaped tortuous channel of the first filter assembly 440. Due to the frequent changes in the gas flow direction, large viscous particles in the exhaust gas collide with the air-facing surface of the baffle under inertia and are adsorbed by the frosted surface. At the same time, some oil mist adheres to and gathers into oil droplets due to contact with the baffle surface and the oleophilic effect. The oil droplets drip down along the guide groove on the air-receiving side of the baffle and enter the bottom oil collection hopper. After being coarsely filtered by the first filter assembly 440, the exhaust gas slows down after entering the buffer space and then flows evenly into the multi-layer mesh of the second filter assembly 450. When the exhaust gas passes through the gaps in the mesh, the remaining fine oil mist comes into full contact with the mesh fibers. On the one hand, it is intercepted by the fibers through inertial collision, and on the other hand, it is captured through diffusion. Because the mesh surface is oleophilic, the oil mist quickly gathers into larger oil droplets on the fiber surface. The oil droplets drip down along the mesh under gravity and enter the bottom oil collection hopper. After being treated by the second filter assembly 450, clean exhaust gas is formed. In the specific structure of the refrigerant box 100, a filter box 130 is detachably connected inside the refrigerant box 100. The filter box 130 includes a filter inlet 131, a filter outlet 132, and a filter assembly disposed between the filter inlet 131 and the filter outlet 132. The filter inlet 131 is connected to the first inlet 110, and the filter outlet 132 is connected to the inner cavity of the refrigerant box 100. The filter assembly is used to filter water medium. The filter assembly includes a granular filter layer 133 and an activated carbon adsorption layer 134 arranged sequentially along the water medium flow direction. The granular filter layer 133 includes stainless steel wire mesh, and the activated carbon adsorption layer 134 includes granular activated carbon. Specifically, the refrigerant box 100 has a maintenance port 140 on its side wall, a guide rail 160 on its maintenance port 140, and a guide groove on the outer wall of the filter box 130. The guide groove and the guide rail 160 are engaged and locked together, and the filter box 130 can slide into or out of the working position of the refrigerant box 100 along the guide rail 160. A sealing cover 150 is hinged to one end of the maintenance port 140, and the sealing cover 150 can open or close the maintenance port 140.

[0027] In this embodiment, as Figure 1 , Figure 3 As shown, the filter box 130 has a rectangular structure. Its top has a filter inlet 131 that connects to the first inlet 110 of the refrigerant tank 100, allowing water entering from the first inlet 110 to pass through the filter inlet 131 into the filter box 130 for filtration. The bottom of the filter box 130 has a filter outlet 132 that connects to the inner cavity of the refrigerant tank 100. The filter assembly includes a granular filter layer 133 located above and an activated carbon adsorption layer 134 located below. The granular filter layer 133 is a double-layer stainless steel wire mesh, and the activated carbon adsorption layer 134 is granular activated carbon. Furthermore, a guide groove matching the guide rail 160 is formed on the outer wall of the filter box 130, with the length of the guide groove matching the length of the filter box 130. A rectangular maintenance opening 140 is formed on the side wall of the refrigerant tank 100 near the first inlet 110. The edges of the maintenance opening 140 are chamfered, and a sealing groove is formed around the inner perimeter of the maintenance opening 140, with a rubber sealing ring embedded in the groove to ensure the sealing performance of the sealing cover 150 when closed. A guide rail 160 is fixed to the inner side wall of the maintenance port 140. The guide rail 160 has a U-shaped cross-section, and its length matches the internal depth of the refrigerant tank 100. Limiting blocks are provided at both ends of the guide rail 160 to prevent the filter box 130 from sliding too deep or falling out. One end of the maintenance port 140 is hinged to a sealing cover 150. The inner side of the sealing cover 150 has a raised sealing rib corresponding to the sealing groove of the maintenance port 140. The sealing ring is squeezed to achieve a seal. Two plastic buckles are provided at the free end of the sealing cover 150. Buckle holders are provided at corresponding positions on the side wall of the refrigerant tank 100. The sealing cover 150 is fixed by the buckles engaging with the holders to prevent the sealing cover 150 from loosening due to vibration during operation.

[0028] In actual operation, open the sealing cover 150 of the maintenance port 140 of the refrigerant box 100, align the maintained filter box 130 with the guide rail 160 inside the maintenance port 140, align the guide grooves on both sides of the filter box 130 with the guide rail 160, and slowly push the filter box 130 along the guide rail 160 into the refrigerant box 100. When the filter box 130 reaches the working position, the filter inlet 131 is connected to the first inlet 110. Close the sealing cover 150, fasten the buckle, and make the sealing rib of the sealing cover 150 press against the sealing ring of the maintenance port 140 to complete the installation. The water medium (containing impurities and trace amounts of oil) discharged from the water ring vacuum pump 300 flows into the first inlet 110 of the refrigerant tank 100 through the pipeline, and enters the filter inlet 131 of the filter box 130. The water medium first flows through the particle filter layer 133, where the double-layer stainless steel wire mesh intercepts solid impurities (metal fragments, sticky particles, etc.). Then the water medium enters the activated carbon adsorption layer 134, where the porous structure of the activated carbon adsorbs trace amounts of oil (plasticizer residues, lubricants, etc.) and soluble organic impurities. After fine filtration, the water medium flows out from the filter outlet 132 and enters the inner cavity of the refrigerant tank 100, completing the filtration. When maintenance is required, stop the water ring vacuum pump 300, open the sealing cover 150, slowly pull the filter box 130 out of the refrigerant box 100 along the guide rail 160, remove the stainless steel wire mesh inside the filter box 130, replace it with a new wire mesh, pour out the expired activated carbon and fill it with new activated carbon, clean the deposited impurities inside the box, after maintenance is completed, slide the filter box 130 back into the working position according to the installation steps, and close the sealing cover 150 to restore system operation.

[0029] In the above structure, the filter box 130 adopts a composite structure in which a granular filter layer 133 and an activated carbon adsorption layer 134 are arranged sequentially along the water flow direction. The granular filter layer 133, made of stainless steel wire mesh, first intercepts solid suspended matter and larger particulate impurities in the water medium, while the granular activated carbon adsorption layer 134 efficiently removes dissolved organic pollutants, oily substances, and some odors from the water, significantly improving the purification efficiency and depth of a single filtration, effectively extending the service life of the water medium, and providing a cleaner and more stable working medium for the water ring vacuum pump 300. By setting a maintenance port 140 with a guide rail 160 on the side wall of the refrigerant tank 100, and allowing the filter box 130 to cooperate with the guide rail 160 through the guide groove, the filter box 130 can be quickly and non-destructively slid in and out, improving the convenience and efficiency of maintenance operations, effectively reducing system downtime, and allowing the filter unit to be cleaned or replaced regularly and easily, ensuring the long-term stability of the circulating water quality and avoiding system performance degradation due to filter component blockage or failure.

[0030] In addition, a waste gas treatment mechanism 500 is connected to the top of the refrigerant box 100. The waste gas treatment mechanism 500 is connected to the filter inlet 131 to purify the gas discharged from the water ring vacuum pump 300.

[0031] In this embodiment, the waste gas treatment mechanism 500 can be a VOC waste gas treatment device, which includes a waste gas inlet connected to the first inlet 110 of the refrigerant tank 100 via a pipe, and also connected to the filter inlet 131 of the filter box 130, thereby receiving the organic waste gas discharged from the third outlet 330 of the water ring vacuum pump 300 and rising to the top of the refrigerant tank 100. The exhaust port of the waste gas treatment mechanism 500 is located at the end opposite to the waste gas inlet, used to discharge the purified gas into the atmosphere at high altitude. This structure not only solves the wastewater pollution problem, but also effectively solves the emission problem of gaseous pollutants (VOCs) through the waste gas treatment mechanism 500, ensuring the environmental compliance of the entire extrusion granulation production process, avoiding pollution to the atmospheric environment, and meeting the increasingly stringent environmental regulations.

[0032] A circulating water pump 600 is connected to the pipeline between the first outlet 120 and the second inlet 210. In this embodiment, the circulating water pump 600 can be a centrifugal clean water pump. Both the pump's inlet and outlet are equipped with standard flanges for connecting to the pipelines from the first outlet 120 of the refrigerant tank 100 and the second inlet 210 of the heat exchanger 200. After the circulating water pump 600 starts, the water medium, which has undergone preliminary sedimentation at the bottom of the refrigerant tank 100, is continuously drawn into the pump inlet. The pressurized water medium is then discharged from the pump outlet and transported through pipelines to the shell-and-tube heat exchanger 200. Under the stable pressure and flow provided by the pump, the water medium can efficiently flow through the heat exchange tubes, fully exchanging heat with the cooling medium outside the tubes, thereby being cooled to the target temperature. The circulating water pump 600 provides a stable and adjustable flow rate and pressure for the entire water circulation system, ensuring sufficient flow and stable pressure of the water medium entering the water ring vacuum pump 300, thus enabling the vacuum pump to form a uniform and sealed water ring.

[0033] In addition, the system also includes a cooling supply mechanism 700, which includes a replenishment port 230 and a recovery port 240. The heat exchanger 200 includes a cooling medium inlet and a cooling medium outlet. The replenishment port 230 is connected to the cooling medium inlet, and the recovery port 240 is connected to the cooling medium outlet. More specifically, the system also includes a temperature control mechanism, which includes a temperature sensor and a controller. The temperature sensor is used to detect at least the temperature of the water medium entering the water ring vacuum pump 300. The controller is connected to the cooling supply mechanism 700 and is used at least to control the cooling medium supply of the cooling supply mechanism 700 according to the temperature detected by the temperature sensor, so as to regulate the cooling power of the heat exchanger 200.

[0034] In this embodiment, the cooling supply mechanism 700 can be a chiller. The chiller's replenishment port 230 is connected to the cooling medium inlet of the heat exchanger 200 via a pipe, responsible for supplying low-temperature cooling medium to the heat exchanger 200. The chiller's return port 240 is connected to the cooling medium outlet of the heat exchanger 200 via a pipe, responsible for receiving the cooling medium whose temperature has increased after taking away heat from the heat exchanger 200, returning it to the chiller for re-cooling, thus forming a closed cooling medium cycle. Additionally, a temperature sensor from the temperature control mechanism is installed on the water medium outlet pipe of the heat exchanger 200 or at the third inlet 310 of the water ring vacuum pump 300, used to detect the actual temperature of the water medium about to enter the water ring vacuum pump 300 in real time. The controller can be a PLC (Programmable Logic Controller) or a dedicated temperature controller, which is connected to the temperature sensor signal to receive temperature data. Simultaneously, it controls the compressor or regulating valve control terminal of the cooling supply mechanism 700.

[0035] In practical operation, the temperature sensor continuously monitors the temperature of the water medium entering the water ring vacuum pump 300 and transmits this signal to the controller in real time. The controller has a preset optimal temperature setpoint and compares the received actual temperature with the preset temperature. If the actual temperature is higher than the preset temperature, the controller determines that the cooling power is insufficient and instructs the cooling supply mechanism 700 to start the compressor or increase the cooling power / cooling water flow rate to provide a lower-temperature cooling medium, thereby increasing the cooling power of the heat exchanger 200. If the actual temperature is lower than the preset temperature, the controller determines that the cooling power is too high and instructs the cooling supply mechanism 700 to reduce the compressor frequency or decrease the cooling power / cooling water flow rate, thereby reducing the cooling power of the heat exchanger 200.

[0036] In the embodiments disclosed in this application, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments disclosed in this application according to the specific circumstances.

[0037] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A water ring vacuum pump circulation system for an extruder, characterized in that, include: A refrigerant tank is used to store water-based media, including a first inlet and a first outlet; A heat exchanger includes a second inlet and a second outlet, the first inlet being in communication with the first outlet for cooling a water medium from the refrigerant tank; A water ring vacuum pump includes a third inlet, a suction port, and a third outlet. The third inlet is connected to the second outlet, and the third outlet is connected to the first inlet, for forming a water ring through a cooled water medium and extracting gas. An oil mist filter includes an air inlet and an air outlet. The air inlet is connected to the exhaust port of the extruder, and the air outlet is connected to the suction port for filtering and pre-treating the gas discharged from the extruder. The oil mist filter also includes a drain port for discharging liquid oil separated from the gas.

2. The water ring vacuum pump circulation system for the extruder according to claim 1, characterized in that, The oil mist filter has a first filter component and a second filter component arranged sequentially along the gas flow direction inside. The first filter component includes multiple parallel and staggered baffles so that the gas can pass through the multiple baffles in a tortuous manner. The second filter component includes a wire mesh component.

3. The water ring vacuum pump circulation system for the extruder according to claim 1, characterized in that, A filter box is detachably connected inside the refrigerant tank. The filter box includes a filter inlet, a filter outlet, and a filter assembly disposed between the filter inlet and the filter outlet. The filter inlet is connected to the first inlet, and the filter outlet is connected to the inner cavity of the refrigerant tank. The filter assembly is used to filter water medium.

4. The water ring vacuum pump circulation system for the extruder according to claim 3, characterized in that, The filtration assembly includes a granular filter layer and an activated carbon adsorption layer arranged sequentially along the direction of water flow.

5. The water ring vacuum pump circulation system for the extruder according to claim 4, characterized in that, The particulate filter layer includes stainless steel wire mesh, and the activated carbon adsorption layer includes granular activated carbon.

6. The water ring vacuum pump circulation system for the extruder according to claim 3, characterized in that, The refrigerant box has a maintenance port on its side wall, and the maintenance port has a guide rail. The outer wall of the filter box has a guide groove, which engages with the guide rail. The filter box can slide into or out of the working position of the refrigerant box along the guide rail. A sealing cover is hinged to one end of the maintenance port, and the sealing cover can open or close the maintenance port.

7. The water ring vacuum pump circulation system for the extruder according to claim 3, characterized in that, The top of the refrigerant tank is connected to an exhaust gas treatment mechanism, which is connected to the filter inlet for purifying the gas discharged from the water ring vacuum pump.

8. The water ring vacuum pump circulation system for the extruder according to claim 1, characterized in that, A circulating water pump is also connected to the pipeline between the first outlet and the second inlet.

9. The water ring vacuum pump circulation system for an extruder according to claim 1, characterized in that, It also includes a cooling supply mechanism, which includes a replenishment port and a recovery port. The heat exchanger includes a cooling medium inlet and a cooling medium outlet. The replenishment port is connected to the cooling medium inlet, and the recovery port is connected to the cooling medium outlet.

10. The water ring vacuum pump circulation system for an extruder according to claim 9, characterized in that, It also includes a temperature control mechanism, which includes a temperature sensor and a controller. The temperature sensor is used to detect the temperature of the water medium entering the water ring vacuum pump. The controller is connected to the cooling supply mechanism and is used to control the supply of cooling medium by the cooling supply mechanism according to the temperature detected by the temperature sensor, so as to adjust the cooling power of the heat exchanger.

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