A compact sludge specific resistance measuring device
The compact design of the sludge resistivity measuring device solves the problems of large device size and high safety risks, and realizes efficient and safe sludge resistivity measurement. It is suitable for standard laboratory benches and supports multiple control experiments.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SOUTH CHINA NORMAL UNIV
- Filing Date
- 2025-06-11
- Publication Date
- 2026-07-07
AI Technical Summary
Existing sludge resistivity measuring devices are large in size, have poor functional expandability, and pose high safety risks. They cannot be adapted to standard experimental benches and cannot perform multiple control experiments.
The device is designed to be compact for measuring the specific resistivity of sludge. It adopts a tabletop design to place the vacuum pump and monitoring module inside the box. It is equipped with a three-way valve structure to achieve simultaneous suction of the two filtrate containers and to dissipate heat through heat dissipation holes.
The device has a 57% smaller volume, a 100% higher filtration efficiency, improved safety, and produces no smoke during continuous operation, thus meeting teaching needs.
Smart Images
Figure CN224471666U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of sludge resistivity measurement technology, and in particular to a compact sludge resistivity measurement device. Background Technology
[0002] In the field of environmental science and engineering, sludge specific resistance is one of the important evaluation indicators of sludge dewatering performance and is the most intuitive method to judge the ease of sludge filtration. Sludge specific resistance is defined as the resistance experienced by a unit mass of dry sludge per unit filtration area. The higher the sludge specific resistance, the more difficult it is to filter, and the worse the dewatering performance. This indicator is usually measured using a sludge specific resistance measurement experimental apparatus.
[0003] Existing sludge specific resistivity measuring devices have the following technical defects:
[0004] 1. The measuring cylinder and overflow tank of the traditional floor-standing device are located above the vacuum pump (see utility model patent CN222299614U). Its dimensions are 500 mm × 450 mm × 1350 mm, which takes up too much laboratory space and cannot be adapted to standard laboratory benches (usually 850 mm high).
[0005] 2. Poor functional expandability: The single-channel filtration design cannot support multiple control experiments;
[0006] 3. Significant safety risks: After one hour of continuous operation, the temperature in the vacuum pump area can reach over 65°C.
[0007] Therefore, modifying the existing sludge resistivity measuring device into a compact design to reduce the space occupied by the device and the volume of sludge required, thereby achieving a more compact, efficient, and safer experimental teaching solution, is one of the technical challenges that urgently need to be addressed. Utility Model Content
[0008] The present invention aims to solve the technical problems existing in the prior art. To this end, the present invention proposes a compact sludge specific resistivity measuring device.
[0009] The compact sludge specific resistance measuring device according to an embodiment of the present invention includes:
[0010] The housing has a cavity, and the rear side of the housing has heat dissipation holes;
[0011] A vacuum pump is installed inside the cavity;
[0012] A monitoring module is installed inside the cavity. The monitoring module is electrically connected to the vacuum pump to monitor the operation of the vacuum pump. The monitoring module includes a timer, a voltmeter, a pressure gauge, a timing switch, and a vacuum pump switch exposed on the front of the housing.
[0013] A three-way valve is located on the side outside the housing. The three-way valve has a first port, a second port, and a third port. The first port is connected to the inlet of the vacuum pump through a connecting pipe. The second port is arranged facing upwards, and the third port is arranged facing downwards. The second port is equipped with a first switch, which is used to open or close the second port. The third port is equipped with a second switch, which is used to open or close the third port. The second port and the third port are respectively used to connect to two different filtrate containers.
[0014] The compact sludge resistivity measuring device according to the embodiments of this utility model has at least the following beneficial effects:
[0015] 1. Adopting a tabletop design, by setting up a cabinet and placing the vacuum pump and monitoring module inside the cabinet, the three-dimensional layout is optimized, the height is compressed to 520 mm, and the overall volume of the device is reduced by 57% compared with traditional devices. The monitoring module can monitor the operation status of the vacuum pump in real time.
[0016] 2. By configuring a three-way valve structure, air can be simultaneously drawn from two filtrate containers, thereby improving the efficiency of sludge specific resistance determination experiments.
[0017] 3. Heat dissipation can be achieved by setting heat dissipation holes, and the device does not produce smoke after running continuously for 1 hour.
[0018] In some embodiments, the compact sludge resistivity measuring device further includes a power supply module for supplying power to the vacuum pump and the monitoring module, the power supply module having a fuse holder and a leakage current switch.
[0019] In some embodiments, the housing has an opening on the left side for the vacuum pump to enter or exit the cavity, and the housing also includes a switch door for opening or closing the opening.
[0020] In some embodiments, the enclosure is made of cold-rolled steel sheet and is formed by laser cutting, and the thickness of the enclosure is 1.7 mm.
[0021] In some embodiments, the heat dissipation hole is circular, and the diameter of the heat dissipation hole is 7 mm.
[0022] In some embodiments, the number of heat dissipation holes is multiple, the multiple heat dissipation holes are arranged at intervals along the circumferential direction, the multiple heat dissipation holes are arranged radially, and the distance between two adjacent heat dissipation holes is 8 mm.
[0023] In some embodiments, the opening area of the heat dissipation holes accounts for 7% to 7.5% of the total area of the back of the housing.
[0024] In some embodiments, the three-way valve is made of copper.
[0025] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description
[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:
[0027] Figure 1 This is a front view of a compact sludge resistivity measuring device according to some embodiments of the present invention;
[0028] Figure 2 This is a left view of a compact sludge resistivity measuring device according to some embodiments of the present invention;
[0029] Figure 3 This is a rear view of a compact sludge resistivity measuring device according to some embodiments of the present invention;
[0030] Figure 4 This is a right view of a compact sludge resistivity measuring device according to some embodiments of the present invention.
[0031] Figure label:
[0032] Compact sludge specific resistivity measuring device 1000;
[0033] 10. Box body; 11. Cavity; 12. Ventilation holes; 13. Opening; 14. Door;
[0034] Vacuum pump 20;
[0035] Timer 30, voltmeter 31, pressure gauge 32, timing switch 33, vacuum pump switch 34;
[0036] Three-way valve 40, first switch 41, second switch 42;
[0037] Power module 50;
[0038] 60. Funnel, 61. Filtration container, 62. Measuring cylinder, 63. Rotary switch, 64. Support, 65. Clamp, 66. Hose. Detailed Implementation
[0039] Reference Figures 1 to 4 As shown, a compact sludge specific resistance measuring device 1000 provided in this embodiment of the present invention includes a housing 10, a vacuum pump 20, a monitoring module and a three-way valve 40.
[0040] The dimensions of the chamber 10 are approximately 74 cm * 34 cm * 52 cm. The chamber 10 has a cavity 11, and a ventilation hole 12 is located on the rear side. A vacuum pump 20 is installed inside the cavity 11. The vacuum pump 20 is a high-reliability rotary vane type with a power of 150 W and a pumping speed of 3.6 m / s. 3 / h, ultimate vacuum 2 Pa. The monitoring module is installed inside chamber 11 and electrically connected to vacuum pump 20 to monitor its operation. The monitoring module includes a timer 30, voltmeter 31, pressure gauge 32, timing switch 33, and vacuum pump 20 switch, all exposed on the front of chamber 10. The timer 30 can time up to 99 minutes and 99 seconds, and the vacuum gauge range is 0 to -0.1 MPa. The timer 30 operates in positive timing mode and automatically shuts off vacuum pump 20 upon completion of the timing.
[0041] Reference Figure 1 and Figure 3 As shown, the three-way valve 40 is made of copper and is located on the left side of the housing 10. The three-way valve 40 has a first port, a second port, and a third port. The first port is connected to the inlet of the vacuum pump 20 via a silicone hose. The second port faces upwards, and the third port faces downwards. The second port has a first switch 41 for opening or closing the second port, and the third port has a second switch 42 for opening or closing the third port. The first and second switches 41 and 42 can be configured as ball valves. The second and third ports are used to connect to two different filtrate containers 61, respectively. The outer diameter of the ports of the three-way valve 40 is 8.5 mm, and the ports are threaded.
[0042] Reference Figure 1 As shown, the compact sludge resistivity measuring device 1000 also includes a funnel 60, a filtrate container 61, and a measuring cylinder 62 arranged sequentially from top to bottom. The filtrate container 61 is clamped by a clamp 65 on a support 64 that can move up and down. The filtrate container 61 and the measuring cylinder 62 are interconnected. The filtrate container 61 and the measuring cylinder 62 are connected or disconnected by a rotary switch 63. There are three rotary switches 63, which are used to control the on / off state of different positions.
[0043] In use, place filter paper in funnel 60 and place a sludge sample on the filter paper, and turn on vacuum pump 20. For example, place a 100 mL sludge sample in funnel 60. At this time, close the two knob switches 63 below filtrate container 61, disconnect the measuring cylinder 62 from the hose 66 and the filtrate container 61 from the measuring cylinder 62, and connect the vacuum pump 20 to the filtrate container 61 through hose 66. Adjust pressure gauge 32 to -0.06 MPa and timer 30 to 30 s. Vacuum pump 20 draws air from inside filtrate container 61, allowing filtrate to pass through the filter paper and enter filtrate container 61. After 30 s, vacuum pump 20 stops working. Then, turn the knob switch 63 between filtrate container 61 and measuring cylinder 62 to release filtrate from filtrate container 61 into measuring cylinder 62 and record the filtrate volume. Repeat the above operation and record the filtrate volume each time. The sludge specific resistance can be measured by calculation.
[0044] In some other embodiments, the knob switch 63 between the filtrate container 61 and the hose 66 can be turned off, the hose 66 can be disconnected from the filtrate container 61, and the other two knob switches 63 can be turned on, so that the vacuum pump 20 can directly draw air from the metering cylinder 62.
[0045] The compact sludge resistivity measuring device 1000 of this embodiment has the following beneficial effects:
[0046] 1. The device adopts a tabletop design. By setting up a cabinet 10 and placing the vacuum pump 20 and monitoring module inside the cabinet 10, the three-dimensional layout is optimized, the height is compressed to 520 mm, and the overall volume of the device is reduced by 57% compared with the traditional device. The monitoring module can monitor the operation status of the vacuum pump 20 in real time.
[0047] 2. By configuring the three-way valve 40, air can be simultaneously drawn from the two filtrate containers 61, thereby improving the efficiency of the sludge specific resistance determination experiment. The vacuum pump 20 has good performance, and only 80-100 mL of sludge is needed for each experiment, which is about 60%-73% less than the sludge required by the traditional device (200-300 mL), greatly improving the filtration efficiency. The three-way valve 40 with dual-channel filtration improves the efficiency of the teaching scenario by 100%.
[0048] 3. Heat dissipation function can be achieved by setting heat dissipation holes 12. The device can run continuously for 1 hour at an ambient temperature of 25℃ without producing smoke. When it runs continuously for 2 hours at an ambient temperature of 25℃, a small amount of smoke will be produced and overflow from the heat dissipation holes 12. The smoke dissipation time after the vacuum pump 20 stops is ≤1 min.
[0049] Reference Figure 3As shown, in some embodiments, the compact sludge resistivity measuring device 1000 also includes a power supply module 50 for powering the vacuum pump 20 and the monitoring module. The power supply module 50 has a fuse holder and a leakage current switch to ensure safe operation of the equipment. The leakage current switch cuts off the power supply within 0.1 seconds in the event of a ground fault, and the fuse holder prevents overload current from damaging the motor of the vacuum pump.
[0050] Reference Figure 2 As shown, in some embodiments, the left side of the housing 10 has an opening 13 for the vacuum pump 20 to enter or exit the chamber 11. The housing 10 also includes a switch door 14 for opening or closing the opening 13. This facilitates observation of the operating status of the vacuum pump 20 and replacement of the vacuum pump oil.
[0051] In some embodiments, the housing 10 is made of cold-rolled steel plate and is formed by laser cutting. The surface of the housing 10 is treated with gray-white baking paint, making the equipment look beautiful and stable. The thickness of the housing 10 is 1.7 mm.
[0052] Reference Figure 3 As shown, in some embodiments, the heat dissipation hole 12 is circular and the diameter of the heat dissipation hole 12 is 7 mm.
[0053] Reference Figure 3 As shown, in some embodiments, there are multiple heat dissipation holes 12, which are arranged at intervals along the circumferential direction, arranged radially, or arranged in a dotted circular five-ring pattern with an outer ring diameter of 125 mm and a spacing of 8 mm between two adjacent heat dissipation holes 12.
[0054] Reference Figure 3 As shown, in some embodiments, the opening area of the heat dissipation hole 12 accounts for 7% to 7.5% of the total area of the back of the housing 10.
[0055] Examples of the embodiments described above are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described above with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.
[0056] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0057] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.
[0058] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.
[0059] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.
Claims
1. A compact sludge specific resistivity measuring device, characterized in that, include: The housing has a cavity, and the rear side of the housing has heat dissipation holes; A vacuum pump is installed inside the cavity; A monitoring module is installed inside the cavity. The monitoring module is electrically connected to the vacuum pump to monitor the operation of the vacuum pump. The monitoring module includes a timer, a voltmeter, a pressure gauge, a timing switch, and a vacuum pump switch exposed on the front of the housing. A three-way valve is located on the side outside the housing. The three-way valve has a first port, a second port, and a third port. The first port is connected to the inlet of the vacuum pump through a connecting pipe. The second port is arranged facing upwards, and the third port is arranged facing downwards. The second port is equipped with a first switch, which is used to open or close the second port. The third port is equipped with a second switch, which is used to open or close the third port. The second port and the third port are respectively used to connect to two different filtrate containers.
2. The compact sludge resistivity measuring device according to claim 1, characterized in that, The compact sludge resistivity measuring device also includes a power supply module for supplying power to the vacuum pump and the monitoring module, the power supply module having a fuse holder and a leakage current switch.
3. The compact sludge resistivity measuring device according to claim 1, characterized in that, The housing has an opening on the side opposite to the three-way valve, which allows the vacuum pump to enter or exit the cavity. The housing also includes a switch door for opening or closing the opening.
4. The compact sludge resistivity measuring device according to claim 1, characterized in that, The enclosure is made of cold-rolled steel sheet and is formed by laser cutting. The thickness of the enclosure is 1.7 mm.
5. The compact sludge resistivity measuring device according to claim 1, characterized in that, The heat dissipation hole is circular and has a diameter of 7 mm.
6. The compact sludge resistivity measuring device according to claim 5, characterized in that, The number of heat dissipation holes is multiple, and the multiple heat dissipation holes are arranged at intervals along the circumference and arranged radially, with a distance of 8 mm between two adjacent heat dissipation holes.
7. The compact sludge resistivity measuring device according to claim 5, characterized in that, The opening area of the heat dissipation holes accounts for 7% to 7.5% of the total area of the back of the enclosure.
8. The compact sludge specific resistivity measuring device according to claim 1, characterized in that, The three-way valve is made of copper.