A filtration device for reducing volatile VOCs

Abstract

This utility model relates to the field of filtration device technology, and in particular to a filtration device for reducing volatile organic compounds (VOCs). It includes a housing with an inlet, an outlet, and a purge recovery port. A filter unit is detachably installed inside the housing. An auxiliary piping system includes a main pipeline, a nitrogen branch, and a vacuum branch. The output end of the main pipeline is connected to the purge recovery port, and the nitrogen and vacuum branches are respectively connected to the input ends of the main pipeline. Through a unique auxiliary piping system design, after filtration, nitrogen is introduced through the nitrogen branch to thoroughly mix with the residual VOCs in the filter unit, breaking the adsorption balance of VOCs on the filter surface. Subsequently, the vacuum branch removes the mixed gas, forcibly expelling the desorbed gas, forming a "pressurized-negative pressure" pulse cleaning process. This deeply removes residual VOCs from the pores inside the filter device, significantly reducing the amount of residual VOCs within the device and meeting environmental protection requirements.

Description

Technical Field

[0001] This utility model relates to the field of filtration device technology, and in particular to a filtration device for reducing volatile VOCs. Background Technology

[0002] Carbonate solvents play a crucial role in the chemical industry. Common carbonate solvents, such as ethylene carbonate (EC), dimethyl carbonate (DMC), ethyl methyl carbonate (EMC), and diethyl carbonate (DEC), are widely used in various fields, including chemicals and pharmaceuticals, due to their unique chemical properties. Especially in the booming new energy industry, as core components of lithium-ion battery electrolytes, they are considered chemical raw materials that meet the requirements of "clean processes" due to their green and environmentally friendly characteristics, becoming a key element in promoting the sustainable development of the industry.

[0003] However, in actual production processes, whether preparing electrolytes or producing carbonates, trace amounts of mechanical impurities often mix into the products. To ensure product quality, filtration devices are necessary for purification. However, traditional filtration devices have several drawbacks. Firstly, frequent disassembly, cleaning, and replacement of filter units often leave behind a large amount of solvent in the filter cartridges. After these solvents evaporate, the filter device becomes filled with volatile organic compounds (VOCs). VOCs, or volatile organic compounds, have high saturated vapor pressure, low boiling point, and small molecular weight under standard conditions, making them highly volatile at room temperature. These volatile VOCs not only pose a serious threat to the occupational health of operators, potentially causing various health problems with long-term exposure, but also, when released into the environment in large quantities, cause air pollution and negatively impact the ecological balance, contradicting the current global advocacy for environmental protection.

[0004] On the other hand, existing filtration equipment on the market currently focuses only on the filtration function itself, and does not treat the volatile organic compounds remaining inside the filtration equipment after the filtration task is completed.

[0005] Based on this, a novel filtration device for reducing volatile VOCs has been developed in this invention to solve the above problems. Utility Model Content

[0006] The purpose of this invention is to provide a filtration device for reducing volatile VOCs. This filtration device, through a unique auxiliary pipeline system design, introduces nitrogen through a nitrogen branch after filtration to thoroughly mix with the residual volatile VOCs within the filter unit, disrupting the adsorption balance of VOCs on the filter element surface. Subsequently, a vacuum branch is used to extract the mixed gas, forcibly expelling the desorbed gas, forming a "pressurized-negative pressure" pulse cleaning process. This deeply removes residual VOCs from the pores inside the filtration device, significantly reducing the amount of volatile VOCs remaining within the device, effectively reducing potential environmental pollution risks, and meeting environmental protection requirements.

[0007] The present invention adopts the following technical solution:

[0008] A filtration device for reducing volatile organic compounds (VOCs) includes:

[0009] The outer casing is provided with a liquid inlet, a liquid outlet, and a purge recovery port.

[0010] A filter unit, wherein the filter unit is detachably installed inside the housing;

[0011] An auxiliary piping system includes a main pipeline, a nitrogen branch pipeline, and a vacuum branch pipeline. The output end of the main pipeline is connected to the purge recovery port, and the nitrogen branch pipeline and the vacuum branch pipeline are respectively connected to the input end of the main pipeline.

[0012] Furthermore, control valves are respectively installed on the nitrogen branch and the vacuum branch.

[0013] Furthermore, the purge recovery port of the outer casing is connected to the output end of the main pipeline via a first connecting pipe;

[0014] One end of the first connecting pipeline is connected to the purge recovery port, and the other end is provided with a first flange; the output end of the main pipeline is provided with a second flange, and the first flange and the second flange are fixedly connected by fasteners.

[0015] Furthermore, an annular sealing groove is formed on the outer end face of one of the first flanges and the second flange, and an annular protrusion matching the annular sealing groove is formed on the outer end face of the other flange, the annular protrusion being placed within the annular sealing groove.

[0016] Furthermore, a sealing ring is provided inside the annular sealing groove.

[0017] Furthermore, a second connecting pipe and a third connecting pipe are respectively provided at the liquid inlet and liquid outlet of the outer casing, and a third flange is provided at the end of the second connecting pipe and the third connecting pipe away from the outer casing.

[0018] Furthermore, a sealing cap is installed at the opening of the outer shell, and a clamping lock is provided at the connection between the outer shell and the sealing cap. The clamping lock is fitted around the connection between the outer shell and the sealing cap to press and seal the two together.

[0019] Furthermore, the clamping clamp includes an integrally formed annular clamp body, the annular clamp body having a first connecting end and a second connecting end, the first connecting end and the second connecting end being fixedly connected by fasteners.

[0020] Furthermore, the inner wall surface of the annular hoop is provided with a radial protrusion; the connection between the outer shell and the sealing cover is provided with an annular groove that matches the radial protrusion, and a sealing ring is provided in the annular groove;

[0021] When the annular hoop is tightened, the radial protrusion is pressed into the annular groove and compresses the sealing ring.

[0022] Furthermore, the outer peripheral wall of the sealing cover is provided with an circumferential sealing groove, and a sealing ring is provided in the circumferential sealing groove.

[0023] Compared with related technologies, the beneficial effects of this utility model are as follows:

[0024] The general working process of the filtration device for reducing volatile VOCs in this invention is as follows:

[0025] The electrolyte to be filtered enters the filtration device through the inlet on the outer casing. As the electrolyte flows through the filtration unit, the unit filters out impurities, thus purifying the electrolyte. The filtered electrolyte then flows out through the drain port, which serves as the outlet for the filtered electrolyte, allowing it to be smoothly discharged and collected into a container.

[0026] After filtration is completed, a purging and recovery process is initiated to reduce the residual volatile VOCs within the filter unit. First, the inlet and outlet are closed, and the nitrogen branch is opened to inject nitrogen into the housing, ensuring thorough mixing of the nitrogen with the residual VOCs in the filter element pores. Next, the nitrogen branch is closed, the vacuum branch is opened, and a vacuum device is used to extract the gas mixed with volatile VOCs from the housing through the purging and recovery port to the external recovery system. Repeating the nitrogen purging and vacuuming operation 3-5 times can significantly reduce the residual volatile VOCs within the filter unit.

[0027] This utility model discloses a filtration device for reducing volatile VOCs. Through a unique auxiliary pipeline system design, after the filtration process is completed, nitrogen is introduced through a nitrogen branch to fully mix with the residual volatile VOCs in the filter unit, breaking the adsorption balance of VOCs on the filter element surface. Subsequently, the mixed gas is extracted through a vacuum branch, and the desorbed gas is forced to be discharged, forming a "pressurized-negative pressure" pulse cleaning process. This process can deeply remove residual VOCs in the pores inside the filter device, greatly reducing the residual amount of volatile VOCs in the device, effectively reducing the potential pollution risk to the environment, and meeting environmental protection requirements. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the structure of the filtration device for reducing volatile VOCs in a specific embodiment of this utility model;

[0030] Figure 2 for Figure 1 Enlarged view of a portion of point A in the middle;

[0031] Figure 3 for Figure 1 Enlarged view of a section at point B in the middle;

[0032] Figure 4 for Figure 1 Schematic diagram of the medium-pressure locking hoop structure;

[0033] In the diagram: 1. Outer shell; 10. Liquid inlet; 11. Liquid outlet; 12. Purge and recovery port; 13. Sealing cap; 131. Circumferential sealing groove; 14. Annular groove; 2. Filter unit; 3. Main pipeline; 30. Second flange; 301. Annular sealing groove; 4. Nitrogen branch; 5. Vacuum branch; 6. First connecting pipeline; 60. First flange; 601. Annular protrusion; 7. Second connecting pipeline; 8. Third connecting pipeline; 80. Third flange; 9. Compression clamp; 90. Annular clamp body; 901. Radial protrusion; 91. First connecting end; 92. Second connecting end. Detailed Implementation

[0034] The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0035] The following is in conjunction with the appendix Figure 1-4 The present invention will be described in detail with specific embodiments:

[0036] like Figure 1-4 As shown, this utility model provides a filtration device for reducing volatile VOCs, which includes a housing 1, a filtration unit 2, and an auxiliary piping system.

[0037] The outer casing 1 is provided with a liquid inlet 10, a liquid outlet 11, and a purge and recovery port 12. The liquid inlet 10 is used to introduce the liquid to be treated (such as electrolyte) containing VOCs, the liquid outlet 11 is used to discharge the filtered liquid, and the purge and recovery port 12 is used for subsequent purge and recovery operations.

[0038] The filter unit 2 can be detachably installed inside the outer shell 1. It should be noted that the present invention does not limit the specific composition of the filter unit 2 or the installation method. For example, it can be installed and fixed in the inner cavity of the outer shell 1 by plugging or snap-fit ​​connection, so that when the filter unit 2 needs to be replaced, the staff can choose the most convenient way to operate according to the actual situation, which greatly shortens the replacement time of the filter unit 2 and improves the convenience of equipment maintenance.

[0039] The auxiliary piping system includes a main pipeline 3, a nitrogen branch pipeline 4, and a vacuum branch pipeline 5. The output end of the main pipeline 3 is connected to the purge recovery port 12, and the nitrogen branch pipeline 4 and vacuum branch pipeline 5 are respectively connected to the input end of the main pipeline 3. The nitrogen branch pipeline 4 is used to introduce nitrogen gas, which mixes thoroughly with the volatile VOCs remaining in the filter unit 2 to achieve the purge function. The vacuum branch pipeline 5 is used to create a vacuum, removing the mixed gas to achieve the recovery function. In this embodiment, control valves are respectively installed on the nitrogen branch pipeline 4 and the vacuum branch pipeline 5 to achieve independent control of the branch pipelines.

[0040] The general working process of the filtration device for reducing volatile VOCs in this invention is as follows:

[0041] The electrolyte to be filtered enters the filter device through the inlet 10 of the outer casing 1. As the electrolyte flows through the filter unit 2, the filter unit 2 performs its filtering function, trapping impurities in the electrolyte and purifying it. The filtered electrolyte flows out through the drain port 11, which serves as the outlet for the filtered electrolyte, allowing the purified electrolyte to be smoothly discharged and collected into a container.

[0042] After filtration is completed, a purging and recovery process is initiated to reduce the residual volatile VOCs within the filter unit. First, the inlet 10 and outlet 11 are closed, and the nitrogen branch 4 is opened to inject nitrogen into the outer casing 1 for approximately 1–5 minutes, ensuring thorough mixing of the nitrogen with the residual VOCs in the filter element pores of filter unit 2. Next, the nitrogen branch 4 is closed, the vacuum branch 5 is opened, and a vacuum device is used to extract the gas mixed with volatile VOCs from the outer casing 1 through the purging and recovery port 12 to the external recovery system. This vacuuming operation takes approximately 5–10 minutes. Repeating the nitrogen purging and vacuuming operation 3–5 times can significantly reduce the residual volatile VOCs within the filter unit.

[0043] This utility model discloses a filtration device for reducing volatile VOCs. Through a unique auxiliary pipeline system design, after the filtration process is completed, nitrogen is introduced through nitrogen branch 4 to fully mix with the residual volatile VOCs in the filter unit 2, breaking the adsorption balance of VOCs on the filter element surface. Subsequently, the mixed gas is extracted by vacuum branch 5, and the desorbed gas is forced to be discharged, forming a "pressurized-negative pressure" pulse cleaning process. This process can deeply remove residual VOCs in the pores inside the filter device, greatly reducing the residual amount of volatile VOCs in the device, effectively reducing the potential pollution risk to the environment, and meeting environmental protection requirements.

[0044] It should be noted that the filtration device for reducing volatile VOCs in this utility model can be a vertical or horizontal structure, and the specific design can be selected by those skilled in the art based on the actual situation; at the same time, the filter unit 2 can be detachably installed inside the outer shell 1, which facilitates the replacement of the filter unit 2 and can adapt to various installation requirements of different types of filter devices.

[0045] Furthermore, in some specific embodiments, the purge recovery port 12 of the outer casing 1 is connected to the output end of the main pipeline 3 through the first connecting pipe 6.

[0046] One end of the first connecting pipe 6 is connected to the purge recovery port 12, and the other end is provided with a first flange 60; the output end of the main pipe 3 is provided with a second flange 30, and the first flange 60 and the second flange 30 are fixedly connected by fasteners. It should be noted that the fasteners in this utility model can be bolts, screws, threaded rods, etc., and no specific limitation is made in this utility model.

[0047] By using the first flange 60 and the second flange 30 to be fixedly connected with fasteners, the installation process of the first connecting pipe 6 and the main pipe 3 can be simplified, and it is also convenient for later maintenance and replacement.

[0048] Specifically, such as Figure 2 As shown, an annular sealing groove 301 is formed on the outer end face of one of the first flange 60 and the second flange 30, and an annular protrusion 601 matching the annular sealing groove 301 is formed on the outer end face of the other flange. The annular protrusion 601 is placed within the annular sealing groove 301. A sealing ring is provided within the annular sealing groove 301.

[0049] The engagement of the annular protrusion 601 and the annular sealing groove 301 forms the first physical sealing barrier. When the first flange 60 and the second flange 30 are fastened with fasteners, the annular protrusion 601 is tightly embedded in the annular sealing groove 301, effectively preventing gas leakage from the gap at the flange connection. Furthermore, a sealing ring installed within the annular sealing groove 301 further enhances the sealing effect. When compressed, the sealing ring fills any tiny gaps that may exist between the annular protrusion 601 and the annular sealing groove 301, forming a second layer of sealing protection. This dual-sealing design significantly improves the sealing performance at the connection between the first connecting pipe 6 and the main pipe 3, playing a crucial role in preventing leakage of volatile VOCs during the purging and recovery process. It ensures the stability and safety of gas transmission within the filter device, meeting the stringent requirements for sealing performance in environmental protection and industrial production. Moreover, the structure of the annular protrusion 601 embedded in the annular sealing groove 301 not only improves the sealing performance but also enhances the connection strength between the first flange 60 and the second flange 30 to a certain extent.

[0050] Furthermore, in some specific embodiments, a second connecting pipe 7 and a third connecting pipe 8 are respectively provided at the liquid inlet 10 and the liquid outlet 11 of the outer shell 1. A third flange 80 is provided at the end of the second connecting pipe 7 and the third connecting pipe 8 away from the outer shell 1 to facilitate external connection at the liquid inlet 10 and the liquid outlet 11.

[0051] Furthermore, in some specific embodiments, an opening is provided on one side of the outer casing 1, and a sealing cap 13 is installed at the opening of the outer casing 1. A clamping clamp 9 is provided at the connection between the outer casing 1 and the sealing cap 13. The clamping clamp 9 is looped around the connection between the outer casing 1 and the sealing cap 13 to press and seal the two together. The clamping clamp 9, looped around the connection between the outer casing 1 and the sealing cap 13, can effectively fill the tiny gap between the outer casing 1 and the sealing cap 13 by uniformly applying pressure, forming a tight sealing structure, preventing the leakage of volatile VOCs gases, avoiding the escape of harmful gases that may harm the working environment and personnel health, and meeting environmental protection requirements.

[0052] Meanwhile, compared to some complex sealing connection methods, such as welding or gluing, the installation and disassembly process of the clamping clamp 9 is extremely simple. When it is necessary to replace the filter unit 2 or perform internal maintenance on the device, the operator only needs to operate the clamping clamp 9 to quickly separate the outer shell 1 from the sealing cover 13, which greatly shortens the equipment downtime, improves maintenance efficiency, and ensures that production activities can be quickly restored to normal operation.

[0053] In some more specific embodiments, such as Figure 4 As shown, the clamping lock 9 includes an integrally formed annular clamp body 90. The annular clamp body 90 has a first connecting end 91 and a second connecting end 92, which are fixedly connected by fasteners to adjust the tightening force of the annular clamp body 90. The fixed connection between the first connecting end 91 and the second connecting end 92 of the clamping lock 90 allows the operator to flexibly adjust the tightening force of the annular clamp body 90 according to actual needs. During installation, the fasteners can be gradually tightened to ensure a tight fit between the sealing cover 13 and the outer shell 1, while avoiding structural damage due to over-tightening. After the device has been running for a period of time, if a decrease in sealing performance is observed, the tightening force can be increased by readjusting the fasteners to restore a good sealing effect without replacing the entire sealing device, greatly improving the flexibility and economy of use.

[0054] At the same time, such as Figure 3 , 4 As shown, a radial protrusion 901 is provided on the inner wall surface of the annular hoop 90; an annular groove 14 matching the radial protrusion 901 is provided at the connection between the outer shell 1 and the sealing cover 13, and a sealing ring is provided in the annular groove 14. When the annular hoop 90 is tightened, the radial protrusion 901 is pressed into the annular groove 14 and compresses the sealing ring, achieving a double sealing effect and preventing leakage of volatile VOCs gas.

[0055] In some more specific embodiments, an circumferential sealing groove 131 may be provided on the outer peripheral wall of the sealing cover 13, and a sealing ring may be provided in the circumferential sealing groove 131 to enhance the sealing performance of the connection between the sealing cover 13 and the outer shell 1.

[0056] The present invention has been further described above with reference to specific embodiments. However, it should be understood that the specific description herein should not be construed as limiting the substance and scope of the present invention. Various modifications made by those skilled in the art to the above embodiments after reading this specification are all within the scope of protection of the present invention.

Claims

1. A filtration device for reducing volatile VOCs, characterized in that: It includes: The outer casing is provided with a liquid inlet, a liquid outlet, and a purge recovery port. A filter unit, wherein the filter unit is detachably installed inside the housing; An auxiliary piping system includes a main pipeline, a nitrogen branch pipeline, and a vacuum branch pipeline. The output end of the main pipeline is connected to the purge recovery port, and the nitrogen branch pipeline and the vacuum branch pipeline are respectively connected to the input end of the main pipeline. The purge recovery port of the outer casing is connected to the output end of the main pipeline through a first connecting pipeline. One end of the first connecting pipeline is connected to the purge recovery port, and the other end is provided with a first flange. The output end of the main pipeline is provided with a second flange, and the first flange and the second flange are fixedly connected by fasteners.

2. The filtration device for reducing volatile VOCs according to claim 1, characterized in that: Control valves are respectively installed on the nitrogen branch and the vacuum branch.

3. The filtration device for reducing volatile VOCs according to claim 1, characterized in that: An annular sealing groove is formed on the outer end face of one of the first flanges and the second flange, and an annular protrusion matching the annular sealing groove is formed on the outer end face of the other flange, the annular protrusion being placed within the annular sealing groove.

4. The filtration device for reducing volatile VOCs according to claim 3, characterized in that: A sealing ring is provided inside the annular sealing groove.

5. The filtration device for reducing volatile VOCs according to claim 1, characterized in that: The liquid inlet and liquid outlet of the outer casing are respectively provided with a second connecting pipe and a third connecting pipe, and a third flange is provided at the end of the second connecting pipe and the third connecting pipe away from the outer casing.

6. The filtration device for reducing volatile VOCs according to claim 1, characterized in that: A sealing cap is installed at the opening of the outer shell, and a clamping lock is provided at the connection between the outer shell and the sealing cap. The clamping lock is fitted around the connection between the outer shell and the sealing cap to press and seal the two together.

7. The filtration device for reducing volatile VOCs according to claim 6, characterized in that: The clamping clamp includes an integrally formed annular clamp body, which has a first connecting end and a second connecting end, and the first connecting end and the second connecting end are fixedly connected by fasteners.

8. The filtration device for reducing volatile VOCs according to claim 7, characterized in that: The inner wall of the annular hoop is provided with a radial protrusion; the connection between the outer shell and the sealing cover is provided with an annular groove that matches the radial protrusion, and a sealing ring is provided in the annular groove; When the annular hoop is tightened, the radial protrusion is pressed into the annular groove and compresses the sealing ring.

9. The filtration device for reducing volatile VOCs according to claim 6, characterized in that: The outer peripheral wall of the sealing cover is provided with an circumferential sealing groove, and a sealing ring is provided in the circumferential sealing groove.

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