Liquid level detection device and dichloromethane separation equipment

Abstract

The utility model relates to a liquid level detection device and dichloromethane separation equipment, the device comprises a liquid level detection element and a protection assembly, the liquid level detection element comprises a junction box, a floating ball rod, a plurality of floating balls and a plurality of limiting pieces, one end of the floating ball rod is connected with the junction box, the plurality of floating balls are arranged on the floating ball rod in a sliding mode, the limiting pieces are fixedly arranged on the floating ball rod, and the junction box is connected with the protection assembly. The limiting piece is used for limiting the stroke of the floating ball; the protection assembly comprises a protection cylinder and a connecting flange, the protection cylinder is provided with a cylinder body and a cylinder bottom, one end of the cylinder body is connected with the connecting flange, the other end of the cylinder body is connected with the cylinder bottom, the cylinder body is provided with an opening communicated with the separation groove, the cylinder bottom is provided with a through hole, and the other end of the floating ball rod penetrates out of the through hole. The connecting flange is used for being connected with a separating tank. According to the liquid level detection device, pollution and deformation of the liquid level detection element are prevented, the measurement precision is improved, the service life is prolonged, and the maintenance difficulty is reduced; by arranging a plurality of floating balls, the measuring precision is high, and the service life is long.

Description

Technical Field

[0001] The utility model belongs to the field of liquid level detection, and in particular relates to a liquid level detection device and dichloromethane separation equipment. Background Art

[0002] The wet-process lithium battery separator production process often uses white oil as a pore-forming agent. After film formation, the white oil is extracted using dichloromethane. This process uses large quantities of white oil and dichloromethane. Recycling these two gases is key to reducing production costs and improving market competitiveness for potassium battery separators.

[0003] Existing extraction drying is also a key process in the wet process. The existing drying process is to heat the diaphragm by continuously adding hot air with controlled temperature, so that the liquid dichloromethane attached to the diaphragm is vaporized into gas, and then introduced into an activated carbon fiber adsorption device for treatment. The dichloromethane on the activated carbon fiber adsorption device is then desorbed by steam. Next, the dichloromethane gas enters the condenser and is condensed into dichloromethane liquid. Finally, the dichloromethane liquid is passed into a separation tank to separate dichloromethane from water. In the separation tank, water and dichloromethane will be separated into layers, with water at the top and dichloromethane at the bottom.

[0004] Currently, a float level gauge is provided in the separation tank to detect the liquid level of dichloromethane. The existing float level gauge includes a float rod and a float movably provided on the float rod. Usually, the existing float level gauge is directly installed in the separation tank. The problems are:

[0005] When the measured liquid contains impurities, dirt, etc., after long-term use, the surface of the guide rod may be scaled, or impurities may accumulate inside the guide rod, resulting in obstruction of the movement of the float, inaccurate measurement, and affecting the normal operation of the liquid level meter; the float rod may bend when affected by liquid fluctuations, which in turn causes the float to malfunction; existing float level gauges mostly use a simple flange fixing method for installation. Although this method is relatively simple in structure, during maintenance, especially in an environment with corrosive liquids, the mounting screws and flanges may be corroded by the liquid, making disassembly difficult, increasing the difficulty and cost of maintenance; if there is only one float, if the float is not moving smoothly or is damaged, the liquid level detection accuracy will be reduced, and dichloromethane will be discharged into the water and cannot be separated, polluting the water; it is greatly affected by liquid level fluctuations, has a limited scope of application, and cannot be judged as true after a false alarm, resulting in low test accuracy and low discharge accuracy of dichloromethane and water. Utility Model Content

[0006] The purpose of the utility model is to provide an improved liquid level detection device, which effectively solves the problems of the float ball and the float ball rod being contaminated, easily deformed, and having low detection accuracy.

[0007] The utility model also provides an improved dichloromethane separation device.

[0008] In order to achieve the above purpose, a technical solution adopted by the utility model is:

[0009] A liquid level detection device, comprising a liquid level detection element and a protective assembly, wherein the liquid level detection element comprises a junction box, a float rod, a plurality of floats, and a plurality of limiters, wherein one end of the float rod is connected to the junction box, the plurality of floats are slidably arranged on the float rod, and a gap is maintained between adjacent two floats, the limiter is fixedly arranged on the float rod, the limiter is used to limit the travel of the float, and the limiters are respectively provided on the upper and lower sides of the float;

[0010] The protection assembly includes a protection tube and a connecting flange. The protection tube has a tube body and a tube bottom. One end of the tube body is connected to the connecting flange, and the other end of the tube body is connected to the tube bottom. An opening is provided on the tube body, and the opening is connected to the separation tank. A through hole is provided on the tube bottom, and the other end of the float rod passes through the through hole. The plurality of floats are located in the protection tube, and the connecting flange is used to connect to the separation tank.

[0011] The device has a working state. When in the working state, the float rod and the protection tube extend along the liquid height direction in the separation tank, and the junction box is located above the separation tank and above the connecting flange.

[0012] According to some implementation aspects of the present invention, two or three floats are provided.

[0013] According to some implementation aspects of the present invention, the density of the float is greater than 1 g / mL and less than 1.3266 g / mL.

[0014] According to some implementation aspects of the present invention, the device further includes a control module and a plurality of sensing modules, the sensing modules correspond one-to-one to the floats, and the control module is signal-connected to the sensing modules.

[0015] According to some implementation aspects of the present invention, a protective filter screen is provided on the outer periphery of the cylinder body, a plurality of through holes are opened on the protective filter screen, and the through holes are connected to the protective cylinder.

[0016] According to some implementation aspects of the present invention, the protective filter is arranged at the lower end of the cylinder body.

[0017] According to some implementation aspects of the present invention, the opening includes a first hole and a second hole, and there are multiple first holes, and the multiple first holes are arranged along the axial direction of the cylinder body; the second hole is close to the bottom of the cylinder, and the second hole is in a long strip shape, and the second hole is arranged along the axial direction of the cylinder body; the opening is in the shape of a waist-round hole.

[0018] According to some implementation aspects of the present invention, there are multiple openings on the barrel, and the multiple openings are arranged around the outer circumference of the barrel.

[0019] According to some implementation aspects of the present invention, the inner wall of the center hole of the connecting flange is provided with a step surface, and one end portion of the barrel abuts against the step surface.

[0020] According to some implementation aspects of the present invention, the protection tube is cylindrical.

[0021] Another technical solution adopted in this utility model is:

[0022] A dichloromethane separation device comprises a separation tank, a liquid level detection device, and a liquid pump, wherein the liquid pump is connected to the separation tank.

[0023] According to some implementation aspects of the present invention, the separation tank includes a tank body, a partition is provided in the tank body, so that the tank body is separated to form a first tank and a second tank, the first tank and the second tank are connected at the side, the first tank is provided with a liquid inlet, the second tank is provided with a first liquid outlet and a second liquid outlet, the first liquid outlet is used to discharge water, and the second liquid outlet is used to discharge dichloromethane; the liquid suction pump is connected to the second liquid outlet.

[0024] Another technical solution adopted in this utility model is:

[0025] Due to the application of the above technical solution, the utility model has the following advantages compared with the prior art:

[0026] The liquid level detection device provided by the utility model has a float rod and multiple floats of the liquid level detection element which are protected in a protective tube. When the liquid in the separation tank fluctuates, it will not directly affect the normal movement of the float and will not affect the detection result. When the measured liquid contains impurities, dirt, etc., even after long-term use, the impurities will not accumulate in the float rod and the surface of the float rod will not scale, thereby preventing contamination and deformation of the liquid level detection element, improving its measurement accuracy and service life, and reducing the difficulty of maintenance. By arranging multiple floats, the liquid level can be accurately adjusted, the measurement accuracy is high, the service life is long, and the safety is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Attachment Figure 1This is a front view of the connection between the liquid level detection device of the utility model and the separation tank;

[0028] Attachment Figure 2 This is a front view of the liquid level detection device of the present utility model;

[0029] Attachment Figure 3 This is a structural diagram of the protective tube of the liquid level detection device of the present invention from a first perspective;

[0030] Attachment Figure 4 This is a structural diagram of the protective tube of the liquid level detection device of the present invention from a second perspective (without the fixing flange);

[0031] Attachment Figure 5 This is a structural diagram of the protective tube of the liquid level detection device of the present invention from a third perspective;

[0032] Attachment Figure 6 This is a structural diagram of the protective tube of the liquid level detection device of the present invention from a fourth perspective;

[0033] Attachment Figure 7 This is a structural diagram of the protective tube of the liquid level detection device of the present invention from a fifth perspective (without the connecting flange);

[0034] Attachment Figure 8 This is a structural diagram of the protective tube of the liquid level detection device of the present invention from a sixth perspective (without the connecting flange);

[0035] Attachment Figure 9 This is a front view of the protective tube of the liquid level detection device of the present utility model;

[0036] Attachment Figure 10 This is a structural diagram of the connecting flange of the liquid level detection device of the present utility model;

[0037] Attachment Figure 11 This is a structural diagram of the separation tank of the dichloromethane separation equipment of the present invention from a first perspective;

[0038] Attachment Figure 12 This is a structural diagram of the separation tank of the dichloromethane separation equipment of the present invention from a second perspective;

[0039] Attachment Figure 13 This is a structural diagram of the separation tank of the dichloromethane separation equipment of the present invention from a third perspective.

[0040] In the above attached figures:

[0041] 1-Liquid level detection element, 11-junction box, 12-float rod, 13-first float, 14-second float, 15-third float, 16-limiting piece, 17-connecting piece;

[0042] 2-protection tube, 21-tube body, 211-first hole, 212-second hole, 22-tube bottom;

[0043] 3-connecting flange, 31-step surface; 4-protective filter;

[0044] 5-separation tank, 51-partition plate, 52-liquid inlet, 53-first liquid outlet, 54-second liquid outlet, 55-first plate, 56-second plate, 57-third plate, 58-fourth plate;

[0045] 6-Fixed flange. DETAILED DESCRIPTION

[0046] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings.

[0047] See also Figures 1 to 9 The liquid level detection device includes a liquid level detection element 1 and a protection component, wherein:

[0048] The liquid level detection element 1 includes a junction box 11, a connector 17, a float rod 12, multiple floats, and multiple limiters 16. One end of the float rod 12 is connected to the junction box 11, and multiple floats are slidably arranged on the float rod 12. Multiple floats are close to the other end of the float rod 12, and a gap is maintained between adjacent two floats; the float rod 12 is a sealed non-magnetic tube; the connector 17 is fixedly arranged on the float rod 12 and is located between the junction box 11 and the float located at the top.

[0049] The device also includes a control module and multiple sensing modules. Each sensing module corresponds to a float, and the control module is signal-connected to the sensing modules. When the float moves along the float rod 12, the sensing modules send signals to the control module. Specifically, the sensing modules include a first sensing unit, located between the float and the rod, and a second sensing unit, located within the rod. The first sensing unit can be a reed switch, and the second sensing unit can be a ring magnet.

[0050] The working principle of the liquid level detection element 1 is: the rise or fall of the liquid will drive the float to move up and down, so that the reed switch corresponding to the float will produce an action of attracting or disconnecting, thereby outputting a switch signal.

[0051] The device also includes a plurality of signal lights and alarms. The signal lights correspond to the floats one by one. The control module is connected to the signal lights and the alarms. The control module controls the corresponding signal lights to light up or not.

[0052] The protection assembly includes a protection tube 2 and a connecting flange 3. The protection tube 2 is connected to the separation tank 5 through the connecting flange 3. The separation tank 5 is provided with a fixed flange 6. The protection tube 2 has a tube body 21 and a tube bottom 22. One end of the tube body 21 is connected to the connecting flange 3, and the other end of the tube body 21 is connected to the tube bottom 22. An opening is provided on the tube body 21, and the opening is connected to the separation tank 5. A through hole is provided on the tube bottom 22. The other end of the float rod 12 penetrates into the tube body from the center hole of the connecting flange 3 and the opening of the tube body 21 and passes through the through hole of the tube bottom 22. The through hole of the tube bottom 22 is used as a guide to install the liquid level detection element 1. Multiple floats are located in the protection tube 2; the connecting piece 17 is used to connect with the connecting flange 3.

[0053] The liquid level detection device in this example has a working state. When in the working state, the float rod 12 and the protective tube 2 both extend along the liquid height direction in the separation tank 5, that is, they are arranged vertically, the connecting flange 3 is connected to the fixed flange 6 on the separation tank 5, and the junction box 11 is located above the separation tank 5 and above the connecting flange 3.

[0054] The float rod 12 and multiple floats of the liquid level detection element 1 are protected in the protective tube 2. When the liquid in the separation tank 5 fluctuates, it will not directly affect the normal movement of the float and will not affect the detection results. When the measured liquid contains impurities, dirt, etc., even after long-term use, the impurities will not accumulate in the float rod 12, and the surface of the float rod 12 will not scale. By setting the protective tube 2, the liquid level detection element 1 can be prevented from being contaminated and deformed, thereby improving its measurement accuracy and service life, and reducing the difficulty of maintenance.

[0055] Preferably, a protective filter screen 4 is provided on the outer periphery of the cylinder body 21, and a plurality of through holes are opened on the protective filter screen 4, which is connected with the protective cylinder 2. The protective filter screen 4 can prevent impurities and dirt in the liquid from entering the protective cylinder 2, and the movement of the float will not be hindered, and the liquid level detection element 1 can work normally.

[0056] More preferably, the protective filter screen 4 is arranged at the lower end of the cylinder body 21 , and the protective filter screen 4 is located at the periphery of the opening of the cylinder body 21 , which can better prevent impurities and dirt in the liquid from entering the protective cylinder 2 .

[0057] In some embodiments, the opening includes a first hole 211 and a second hole 212, and a plurality of first holes 211 are provided, and the plurality of first holes 211 are arranged in sequence along the axial direction of the barrel 21, and the first hole 211 can be circular, square or other feasible shapes; the second hole 212 is located below the first hole 211, the second hole 212 is close to the bottom 22 of the barrel, and the second hole 212 is in a long strip shape, such as a waist-shaped hole shape, and the second hole 212 is arranged along the axial direction of the barrel 21; in one embodiment, a plurality of openings are provided on the barrel 21, and the plurality of openings are evenly arranged around the outer circumference of the barrel 21.

[0058] In some embodiments, a central hole is defined in the center of the connecting flange 3, through which one end of the float rod 12 passes to connect to the junction box 11. A stepped surface 31 is provided on the inner wall of the central hole of the connecting flange 3. The stepped surface 31 is a horizontal surface, and one end of the barrel 21 abuts against the stepped surface 31, facilitating the connection between the protective barrel 2 and the connecting flange 3.

[0059] In some embodiments, the device also includes multiple limit members 16, which are used to limit the travel of the float to prevent collision between two adjacent floats. The limit members 16 are snap buckles, and the limit members 16 are arranged on the float rod 12. Multiple limit members 16 are arranged in sequence along the axial direction of the float rod 12, and the limit members 16 are respectively arranged on the front and back sides of the float, that is, each float corresponds to two limit members 16.

[0060] In some embodiments, the protective tube 2 is cylindrical, and the tube bottom 22 is connected to the tube body 21 and is perpendicular to the tube bottom 22. The tube bottom 22 is made of a stainless steel plate cut by laser, and the tube bottom 22 and the tube body 21 are welded.

[0061] In another embodiment of the present invention, a dichloromethane separation device is provided. Figure 10-13 The equipment includes a separation tank 5, a liquid level detection device, and a liquid pump. The separation tank 5 includes a tank body, which is provided with a partition 51 to separate the tank body into a first tank and a second tank. The first tank and the second tank are connected at the side. The first tank has a liquid inlet 52, and the second tank has a first liquid outlet 53 and a second liquid outlet 54. The first liquid outlet 53 is used to discharge water, and the second liquid outlet 54 is used to discharge dichloromethane. The first liquid outlet 53 is located on the upper side of the tank body, and the second liquid outlet 54 is located on the lower side of the tank body. The liquid pump is connected to the second liquid outlet 54. The liquid level detection element 1 is located in the second tank and is used to detect the liquid level in the second tank. The first and second tanks are arranged to facilitate the separation of water and dichloromethane.

[0062] See also Figure 10-13 The tank body is in a square shape and has two oppositely arranged front sides ( Figure 12 a in the middle) and the rear side, the left side ( Figure 12 (Indicated by b in the middle) and the right side, the upper side and the lower side are arranged oppositely, the partition 51 has opposite ends, the left end of the partition 51 is connected to an inner wall of the tank body, and a gap is maintained between the right end of the partition 51 and the other inner wall of the tank body, so that the first tank and the second tank are connected at the side; there is a gap between the upper side of the tank body and the upper end of the partition 51, and the water level after separation rises and automatically overflows from the upper part of the separation tank 5.

[0063] In some embodiments, the first tank has a first cavity and a second cavity, and the first cavity and the second cavity are separated by a first isolation member. The first cavity is connected to the liquid inlet 52 and the second cavity. The liquid first enters the first cavity from the liquid inlet 52 and then enters the second cavity. The function of the first cavity is: the liquid first stands still in the first cavity, which is conducive to stratification and also plays a guiding role.

[0064] See also Figure 12-13 The first isolating member includes a first plate 55 and a second plate 56. One end of the first plate 55 is connected to the front side of the trough body, the other end of the first plate 55 is connected to one end of the second plate 56, and the other end of the second plate 56 is connected to the left side of the trough body. A liquid inlet 52 is opened on the front side and / or the left side of the trough body.

[0065] The second tank has a third cavity and a fourth cavity, which are separated by a second separator. The third cavity is connected to the first liquid outlet 53 and the fourth cavity. The separated water first passes through the third cavity and then is discharged through the first liquid outlet 53. The third cavity plays a guiding role.

[0066] See also Figure 12-13 The second isolating member includes a third plate 57 and a fourth plate 58. One end of the third plate 57 is connected to the left side of the trough body, the other end of the third plate 57 is connected to one end of the fourth plate 58, and the other end of the fourth plate 58 is connected to the rear side of the trough body. A first liquid outlet 53 is opened on the left side of the trough body.

[0067] In this example, the weight of the float is greater than 1 g / mL and less than 1.3266 g / mL. The float can float on dichloromethane and sink in water. The density of dichloromethane is 1.3266 g / mL, and the density of water is 1 g / mL.

[0068] In this example, there are two or three floats, and preferably three floats are provided. The three floats are arranged in sequence along the axial direction of the float rod 12, and from bottom to top they are the first float 13, the second float 14, and the third float 15. The first float 13 is closer to the other end of the float rod 12 than the second float 14. The distance (stroke) that the first float 13, the second float 14, and the third float 15 move along the float rod 12 can be set. The first float 13, the second float 14, and the third float 15 are all normally open.

[0069] When the liquid level detection device is working, the float rod 12 is set vertically. The working principle is: the mixed liquid of water and dichloromethane enters the first tank from the liquid inlet 52 of the separation tank 5, and then enters the second tank. The water density is 1000kg / m 3 In the upper layer, the density of dichloromethane is 13266 kg / m 3In the lower layer; dichloromethane first contacts the first float 13, the first float 13 floats up, and dichloromethane continues to enter the separation tank 5 until the second float 14 contacts the dichloromethane, the second float 14 floats up, the induction circuit is closed, and the liquid pump is triggered to discharge the dichloromethane in the tank. When the first float 13 contacts the dichloromethane again, it means that the amount of dichloromethane is reduced, and the liquid pump stops working. If the liquid pump continues to work to output dichloromethane at this time, water will be discharged along with it, and dichloromethane and water cannot be separated; if the third float 15 contacts dichloromethane, the amount of dichloromethane is large (dichloromethane may flow out with water from the first liquid outlet 53 and pollute the water), indicating that the liquid pump did not discharge the dichloromethane in time, and there is a problem with the liquid pump. At this time, the alarm is triggered to remind the operator to check the liquid pump.

[0070] The start and stop of the liquid pump is automatically linked to the rising of the second float 14 in the middle, and automatically stops after the first float 13 at the bottom falls. This can prevent the upper wastewater from being discharged from the second liquid outlet 54 and flowing into the recovered dichloromethane (the wastewater cannot be separated from the dichloromethane).

[0071] In this example, multiple floats are set to achieve multiple liquid level controls such as low, medium and high, and precise adjustment of the liquid level. A single float cannot meet the needs. If only one float is set, the float cannot dock at the sensing point, but just passes through it. After passing through, there is no sensing and no signal is transmitted, which will lead to the situation where it is impossible to see where the liquid level is, and it is impossible to control the start and stop of the liquid pump, and it is impossible to control the normal operation of the liquid pump.

[0072] In this example, when three floats are provided, six limiting members 16 are provided.

[0073] The above embodiments are intended only to illustrate the technical concepts and features of the present invention. Their purpose is to enable those familiar with the art to understand the contents of the present invention and implement them accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications based on the spirit of the present invention are intended to be included in the scope of protection of the present invention.

Claims

1. A liquid level detection device, characterized in that: The device includes a liquid level detection element and a protection component. The liquid level detection element includes a junction box, a float rod, multiple floats, and multiple limiters. One end of the float rod is connected to the junction box. The multiple floats are slidably arranged on the float rod. The limiter is fixedly arranged on the float rod. The limiters are respectively provided on the upper and lower sides of the float. The limiters are used to limit the travel of the float. The protection assembly includes a protection tube and a connecting flange. The protection tube has a tube body and a tube bottom. One end of the tube body is connected to the connecting flange, and the other end of the tube body is connected to the tube bottom. An opening is provided on the tube body, and the opening is connected to the separation tank. A through hole is provided on the tube bottom, and the other end of the float rod passes through the through hole. The plurality of floats are located in the protection tube, and the connecting flange is used to connect to the separation tank. The device has a working state. When in the working state, the float rod and the protection tube extend along the liquid height direction in the separation tank, and the junction box is located above the separation tank and above the connecting flange.

2. The liquid level detection device according to claim 1, characterized in that: There are two or three floating balls.

3. The liquid level detection device according to claim 1, characterized in that: The density of the float is greater than 1 g / mL and less than 1.3266 g / mL.

4. The liquid level detection device according to claim 1, characterized in that: The device further comprises a control module and a plurality of sensing modules. The sensing modules correspond to the floats one by one, and the control module is signal-connected to the sensing modules.

5. The liquid level detection device according to claim 1, characterized in that: A protective filter screen is provided on the outer periphery of the cylinder body. A plurality of through holes are opened on the protective filter screen. The through holes are connected to the protective cylinder.

6. The liquid level detection device according to claim 1, characterized in that: The opening includes a first hole and a second hole. There are multiple first holes, and the multiple first holes are arranged along the axial direction of the cylinder body; the second hole is close to the bottom of the cylinder, the second hole is long and strip-shaped, and the second hole is arranged along the axial direction of the cylinder body; the opening is in the shape of a waist-round hole.

7. The liquid level detection device according to claim 6, characterized in that: There are multiple openings on the barrel, and the multiple openings are arranged around the outer circumference of the barrel.

8. The liquid level detection device according to claim 1, characterized in that: The inner wall of the center hole of the connecting flange is provided with a step surface, and one end portion of the cylinder body abuts against the step surface.

9. A dichloromethane separation device, characterized in that, The equipment includes a separation tank, a liquid level detection device, and a liquid pump. The liquid level detection device is the liquid level detection device according to any one of claims 1 to 8, and the liquid pump is connected to the separation tank.

10. The dichloromethane separation equipment according to claim 9, characterized in that The separation tank includes a tank body, a partition is provided in the tank body, so that the tank body is separated into a first tank and a second tank, the first tank and the second tank are connected at the side, the first tank is provided with a liquid inlet, and the second tank is provided with a first liquid outlet and a second liquid outlet, the first liquid outlet is used to discharge water, and the second liquid outlet is used to discharge dichloromethane; the liquid pump is connected to the second liquid outlet.

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