Application device for monitoring liquid level in limited space

Abstract

The utility model discloses a liquid level monitoring application device used in a limited space. The liquid level monitoring application device comprises a floater mechanism, a transmission mechanism, a display mechanism and a control mechanism. The floater mechanism is arranged in a water storage grid of the sewage storage tank; the display mechanism is arranged at the light well position of the sewage storage tank; the floater mechanism is connected with the display mechanism through the transmission mechanism, the display mechanism is connected with the control mechanism, and the control mechanism is connected with hydraulic drive hydraulic flushing equipment in the sewage storage tank. According to the utility model, the water level in the water storage grid can be effectively monitored, a basis is provided for operating flushing equipment, basic support reference is provided for flushing and cleaning impurities in the tank, and meanwhile, a safe environment is created for maintainers to enter a limited space for overhaul and maintenance.

Description

Technical Field

[0001] The utility model relates to water treatment and sewage resource utilization technology, and more specifically, to an application device for liquid level monitoring in a confined space. Background Art

[0002] The existing sewage storage tank in the sewage treatment plant has a "convex" shape in the structural design. There are water storage grids and supporting hydraulically driven hydraulic flushing equipment on both sides of the bottom for flushing after the storage tank is emptied. There are currently two main solutions for monitoring the liquid level in the sewage storage tank:

[0003] 1) Open a hole at the top of the sewage storage tank and directly install a liquid level meter based on the ultrasonic principle to monitor the liquid level in the tank and confined space;

[0004] 2) Similarly, a hole is opened on the top of the sewage storage tank, and a level meter based on the principle of radar electromagnetic waves is directly installed.

[0005] Ultrasonic level meter is a non-contact level meter, and its disadvantages during measurement are as follows:

[0006] ① When measuring the liquid level, no other obstacles or floating impurities on the liquid surface are allowed in the direction of sound wave diffusion;

[0007] ②When ultrasonic waves are working, they are limited by the transmission time of sound waves. A small area near the ultrasonic transducer cannot receive the sound waves, resulting in a blind area that cannot be measured.

[0008] ③ Ultrasonic waves are greatly affected by ambient temperature. Temperature changes also have a great impact on the speed of sound. Therefore, when the ambient temperature changes, it affects the measurement error.

[0009] ④ In the ultrasonic working environment, dust has a greater impact on its measurement, because dust has a very obvious attenuation on the sound wave during the transmission process, so it is not suitable for use in a dusty environment; ⑤, ultrasonic waves are also subject to the limitation of beam angle during transmission. Too large or too small beam angle has a greater impact on measurement accuracy, so it has higher installation requirements;

[0010] ⑥ Ultrasonic waves are prone to produce fluctuations and interference signals during measurement, resulting in unstable measurement results;

[0011] ⑦ The ultrasonic measurement range is small, and the general measurement range is 0-10m with high accuracy. It is not suitable for measuring deep liquid level monitoring environment.

[0012] ⑧ Ultrasonic level meters cannot be used in situations where there is water mist, media that easily produces a large amount of foam, or volatile media, as they are likely to absorb sound waves or interfere with sound wave emissions, causing signal loss and reduced accuracy.

[0013] Radar electromagnetic wave level meter is also a non-contact level meter, and its disadvantages during measurement are as follows:

[0014] ① When foam appears on the monitored liquid surface or overflow occurs at a high liquid level, the dielectric constant is low at this time, which will cause the reflected wave to attenuate, resulting in inaccurate liquid level monitoring;

[0015] ② The measuring medium has high requirements. There should be no obstacles between the measuring medium and the measured object. Even impurities such as floating objects on the surface of the liquid will affect the measuring results of the instrument.

[0016] ③Since the radar level meter works on the principle of electromagnetic waves, when it receives interference from external high-frequency signals or external electromagnetic signals, the measurement error will increase;

[0017] ④ The radar level meter has high requirements on the quality of the power supply. When its power supply components are affected by AC harmonics, they are easily damaged;

[0018] ⑤ When the radar level meter is working, if it encounters icy weather, it needs to be insulated and the antenna needs to be cleaned in time.

[0019] ⑥The radar level meter has high requirements for installation and must be perpendicular to the liquid surface so that its electromagnetic wave can completely cover the measured liquid surface;

[0020] ⑦ The radar level meter is complex to design and manufacture, so it is expensive and requires a large investment;

[0021] ⑧ Radar level meters require regular maintenance during use to ensure their normal operation and good measurement accuracy, so the maintenance cost is also high, which adds an economic burden to the enterprise.

[0022] To sum up, due to the structural form of the existing regulating reservoir body, the traditional ultrasonic level meter and radar level meter are not suitable for the monitoring environment of the regulating reservoir water storage grid, and cannot effectively monitor the actual liquid level of the water storage grid. The production personnel cannot accurately know the water level in the water storage grid, resulting in the inability to effectively operate the flushing equipment, and cannot accurately judge whether to flush, and even blind flushing occurs during the flushing operation. Utility Model Content

[0023] In view of the defects existing in the prior art, the purpose of the utility model is to provide an application device for liquid level monitoring in confined spaces, which can effectively monitor the water level in the water storage grid and provide a basis for operating the flushing equipment. It plays a basic supporting reference in ensuring the flushing and cleaning of impurities in the pool, and at the same time creates a safe environment for maintenance personnel to enter the confined space for inspection and maintenance.

[0024] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0025] A liquid level monitoring application device for a confined space, comprising a float mechanism, a transmission mechanism, a display mechanism and a control mechanism;

[0026] The float mechanism is arranged in the water storage grid of the sewage storage tank;

[0027] The display mechanism is arranged at the light well of the sewage storage tank;

[0028] The float mechanism is connected to the display mechanism through the transmission mechanism, the display mechanism is connected to the control mechanism, and the control mechanism is connected to the hydraulically driven hydraulic flushing equipment in the sewage storage tank;

[0029] The float mechanism comprises a float chamber and a float body;

[0030] The float chamber is vertically fixed to the side wall of the water storage grid;

[0031] The float body is arranged in the float chamber;

[0032] The transmission mechanism includes a force transmission chain rope, a pulley and a pulley bracket;

[0033] There are multiple pulley brackets, which are respectively arranged on the wall surface of the water storage grid;

[0034] There are multiple pulleys, which are respectively arranged on the corresponding pulley brackets;

[0035] One end of the force transmission chain rope is connected to the float body;

[0036] The display mechanism includes a plane scale, a magnetic flap level gauge, a liquid level indicator cursor and a liquid level remote transmission transmitter;

[0037] The plane scale is arranged in parallel with the magnetic flap level gauge;

[0038] The liquid level indicating cursor is arranged between the plane scale and the magnetic flap liquid level gauge;

[0039] The other end of the force transmission chain is connected to the liquid level indicating cursor;

[0040] The liquid level remote transmission transmitter is arranged on the magnetic flap liquid level gauge and is connected to the control mechanism.

[0041] Preferably, the float chamber is configured to be cylindrical with a diameter of 200 mm.

[0042] Preferably, the float chamber is fixed to the side wall of the water storage grid by a fixing mechanism;

[0043] A through hole is provided at the bottom of the float chamber.

[0044] Preferably, a tuning fork-shaped sprocket support is provided on the pulley bracket;

[0045] A pulley bearing for mounting the pulley is embedded in the tuning fork-shaped area on the sprocket support.

[0046] Preferably, the pulley bearing adopts a ceramic bearing;

[0047] The fixed shaft of the pulley is made of 316 stainless steel, the outer shaft end is made of fluororubber, and a U-shaped groove for placing the force transmission chain rope is opened radially.

[0048] Preferably, a guide pulley groove group is provided above the liquid level indicating cursor;

[0049] The other end of the force transmission chain rope is connected with the liquid level indicating cursor around the guide pulley groove group.

[0050] Preferably, the display mechanism is arranged in a liquid level mechanism bracket / housing.

[0051] Preferably, the liquid level indicator cursor is provided with a magnet;

[0052] The magnet cooperates with the magnetic ball in the magnetic flap level gauge.

[0053] Preferably, the control mechanism includes a remote control system and a PLC control cabinet;

[0054] The liquid level remote transmitter is connected to the remote control system via a signal transmission line;

[0055] The remote control system is connected to the PLC control cabinet via a signal transmission line;

[0056] The PLC control cabinet is connected to the hydraulically driven water flushing equipment via a signal transmission line.

[0057] The utility model provides a liquid level monitoring application device for a confined space, which has the following beneficial effects:

[0058] 1) The utility model designs and installs a fixing device in the water storage grid according to the specific structure to control the working range and activity area of ​​the float body, effectively controls the movement trajectory of the float body in the water storage grid, and provides a basic guarantee for effectively monitoring the liquid level in the water storage grid and ensuring the hydraulic flushing effect;

[0059] 2) The utility model provides a specific monitoring means for determining whether the flushing water in the water storage grid has reached a certain amount each time the regulating reservoir needs to be emptied and flushed, and plays a guiding role in ensuring the flushing and cleaning effect of the sediment on the bottom plate in the regulating reservoir;

[0060] 3) The utility model can significantly reduce the investment in municipal infrastructure and significantly reduce the investment cost of using other types of liquid level monitoring alternative equipment;

[0061] 4) The utility model provides a reliable technical method for monitoring the liquid level of functional pools in similar confined spaces in the future, and solves the problem of reading the liquid level in the water storage grid during on-site inspections in many aspects. At the same time, the monitored liquid level value is converted into an electrical signal and uploaded to the host computer, ensuring that the monitoring personnel in the central control room can grasp the liquid level in the confined space. At the same time, by modifying the operating program of the imported hydraulic flushing equipment, the liquid level electrical signal is connected to the communication module and participates in the program operation of the hydraulic flushing equipment, so as to achieve accurate flushing for automatic control operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] Figure 1 It is a schematic diagram of the layout of the application device of the utility model for liquid level monitoring in a confined space. DETAILED DESCRIPTION

[0063] In order to better understand the above technical solution of the present invention, the technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0064] Combination Figure 1 As shown, the utility model provides an application device for monitoring liquid level in a confined space, which includes a float mechanism, a transmission mechanism, a display mechanism and a control mechanism.

[0065] The sewage storage tank 100 is in a convex shape, with water storage grids 101 and matching hydraulically driven water flushing equipment 102 designed on both sides of the bottom. The utility model is provided with two sets of liquid level monitoring application devices in confined spaces, which are respectively arranged in two water storage grids 101.

[0066] The float mechanism includes a float chamber 1 and a float body 2. The float chamber 1 is fixed to the side wall of the water storage grid 101 by a fixing mechanism 3 to maintain a vertical state. The float body 2 is installed in the float chamber 1. The float body 2 moves freely up and down in the float chamber 1 as the liquid level of the water storage grid 101 changes.

[0067] The float chamber 1 is set to be cylindrical with a diameter of 200 mm. A through hole is opened at the bottom, which is connected to the sewage in the water storage grid 101 to ensure that the liquid levels of the sewage in the water storage grid 101 and the sewage in the float chamber 1 remain level.

[0068] The transmission mechanism includes a force transmission chain rope 4, a pulley 5 and a pulley bracket 6. There are multiple pulley brackets 6, which are respectively installed on the wall of the water storage grid 101. There are multiple pulleys 5 (the number matches the pulley brackets 6), which are respectively installed on the corresponding pulley brackets 6. One end of the force transmission chain rope 4 is connected to the float body 2.

[0069] The display mechanism is installed in the liquid level mechanism bracket / housing 11, including a plane scale 7, a magnetic flap liquid level gauge 8, a liquid level indicator cursor 9 and a liquid level remote transmitter 10. The liquid level mechanism bracket / housing 11 is installed on the external exposure platform of the light well 103 of the sewage storage tank 100, the plane scale 7 and the magnetic flap liquid level gauge 8 are arranged in parallel, the liquid level indicator cursor 9 is arranged between the plane scale 7 and the magnetic flap liquid level gauge 8, and the other end of the force transmission chain rope 4 is connected to the liquid level indicator cursor 9 after winding around the guide pulley groove group.

[0070] The float body 2 is fixed on the line segment of the force transmission chain rope 4, so that the float body 2 floats up and down on the cavity elevation of the float chamber 1 during the rise and fall of the liquid level; the force transmission chain rope 4 can be guided to the free space during the guidance of the pulley 5.

[0071] Within the measuring range of the plane scale meter 7, the liquid level indicating cursor 9 changes with the liquid level in the water storage grid 101, triggering the float body 2 to float up and down. Under the running condition of the force transmission chain rope 4, the liquid level indicating cursor 9 also moves up and down and indicates different liquid level scales on the plane scale meter 7, so that the production operation personnel can read the liquid level height in the water storage grid 101 very intuitively at the work site.

[0072] A magnet 12 is embedded at the other end of the liquid level indicating cursor 9. The magnet 12 moves up and down with the liquid level indicating cursor 9. The magnetic flap liquid level gauge 8 is installed parallel to the plane scale gauge 7. When the magnet 12 moves up and down, it triggers the magnetic ball in the magnetic flap liquid level gauge 8 to flip, thereby indicating the reading scale line of the magnetic flap liquid level gauge 8 at the same time. The magnetic flap liquid level gauge 8 is installed back to back with the plane scale gauge 7. In addition, production operators can easily read the liquid level height in the water storage grid 101 from different opposite directions.

[0073] The liquid level remote transmitter 10 is installed on the top of the magnetic flap liquid level gauge 8, converts the liquid level signal of the magnetic flap liquid level gauge 8 into a 4-20mA electrical signal, and then transmits the analog signal to the remote control system 14 through the signal transmission line 13. The personnel in the central control room can directly read the liquid level value in the confined space on the host computer in the control room.

[0074] The remote control system 14 then transmits the information to the on-site PLC control cabinet 16 via the signal transmission line 15. The PLC control cabinet 16 is equipped with a control module. The PLC control cabinet 16 is connected to the hydraulically driven water power flushing equipment 102 via the signal transmission line 17. The operation program of the existing hydraulically driven water power flushing equipment 102 is modified in the control module. When the liquid level signal meets the conditions, it participates in the automatic flushing operation program. By manufacturing these series of system core equipment and key components, certain process combinations and assembly are performed for the manufactured system components according to their different functions, thereby forming its functional technical route.

[0075] A tuning fork-shaped sprocket support is provided on the pulley bracket 6. A pulley bearing for mounting the pulley 5 is inlaid in the tuning fork-shaped area of ​​the sprocket support. The pulley bearing adopts a ceramic bearing with high corrosion resistance.

[0076] The fixed axis of the pulley 5 is made of 316 stainless steel, the outer axis end is made of fluororubber, and a U-shaped groove for placing the force transmission chain rope 4 is radially opened. The corrosion-resistant force transmission chain rope 4 can be placed in the groove in its cycloidal direction. One end of the force transmission chain rope 4 is connected to the float body 2, and the other end of the force transmission chain rope 4 is connected to the guide pulley groove group in the exposed space on the top of the pool, thereby realizing that the float body 2 can rise and fall freely in the water storage grid 102 in the hidden space as the liquid level rises and falls, and the change of the liquid level is dynamically output to the guide pulley groove group on the top of the pool through the mechanically driven pulley 5 and the force transmission chain rope 4.

[0077] The plane scale meter 7 is provided with a scale, and the scale can be set to the millimeter level, which is instructive for production monitoring, according to the actual requirements for the accuracy of the liquid level. The force transmission chain rope 4 is in the parallel section of the scale, and a liquid level indicator cursor 9 is installed on the force transmission chain rope 4. As the force transmission chain rope 4 moves, the liquid level indicator cursor 9 also indicates different scale values. Finally, the liquid level changes in the hidden space, resulting in changes in the float body 2 in the space, which are transmitted to the movement of the force transmission chain rope 4 and the indicating activity of the liquid level indicator cursor 9, can point to different scale data, creating conditions for on-site inspectors to accurately read the liquid level value of the hidden space, and providing guidance for the subsequent flushing operation of the liquid level.

[0078] A magnetic float level gauge 8 is assembled in parallel on the back of the plane scale 7, and a magnet 12 is embedded on the liquid level indicating cursor 9 of the force transmission chain rope 4. When the liquid level indicating cursor 9 indicates on the original scale, the magnet 12 is triggered to drive the magnetic beads in the magnetic float level gauge 8 to roll, thereby indirectly verifying the reading of the original scale. At the same time, the dial of the magnetic float level gauge 8 and the scale of the plane scale 7 are installed back to back, so that the patrol personnel can read the actual liquid level in the confined space in the opposite direction, thereby reducing the scope of patrol activities on site and alleviating the workload of patrol.

[0079] The force transmission chain rope 4 adopts a stainless steel chain rope with high tensile strength, high yield strength, high flexibility and strong corrosion resistance, with a diameter between 3mm and 4mm, and maintains flexible movement along the cycloid direction in the customized "U"-shaped pulley groove.

[0080] In summary, the utility model is used for the liquid level monitoring application device in the confined space. It applies classical physics (buoyancy theorem) to solve the buoyancy generated by the change of the liquid level of the float body in the confined space, and drives the up and down movement of the float body; through the customized pulley bracket, pulley, force transmission chain rope, plane scale, combined with the scientific principles of mechanical transmission force and sliding force, the accurate monitoring of the liquid level value in the confined space in the exposed space is solved.

[0081] The utility model solves the problem of using a flat scale meter to read the liquid level value in a confined space in advance, and adds a back-mounted magnetic flap liquid level meter, so that on-site production inspectors can read the liquid level value in the confined space from the opposite direction, or collect the liquid level scale on the magnetic flap liquid level meter through video monitoring devices installed in different directions, thereby reducing the inspection routes and work intensity of on-site inspectors.

[0082] The utility model converts the liquid level signal through a remote transmitter installed on a customized magnetic flap liquid level gauge, and sends it to the host computer of the remote control system through a 4-20Made electrical signal, thereby realizing the function of manually monitoring the restricted empty liquid level in the control room and releasing the human resource cost.

[0083] The utility model transmits the liquid level electrical signal received by the remote control system to the on-site PLC control cabinet, edits and modifies the current operating program of the module, and loads the parameter to the control end of the hydraulic water power flushing gate equipment, thereby realizing the automatic and effective operation of the hydraulic water power flushing gate.

[0084] Those skilled in the art should recognize that the above embodiments are only used to illustrate the present invention, and are not intended to limit the present invention. As long as they are within the spirit of the present invention, any changes or modifications to the above embodiments will fall within the scope of the claims of the present invention.

Claims

1. A liquid level monitoring application device for a confined space, characterized in that: It includes a float mechanism, a transmission mechanism, a display mechanism and a control mechanism; The float mechanism is arranged in the water storage grid of the sewage storage tank; The display mechanism is arranged at the light well of the sewage storage tank; The float mechanism is connected to the display mechanism through the transmission mechanism, the display mechanism is connected to the control mechanism, and the control mechanism is connected to the hydraulically driven hydraulic flushing equipment in the sewage storage tank; The float mechanism comprises a float chamber and a float body; The float chamber is vertically fixed to the side wall of the water storage grid; The float body is arranged in the float chamber; The transmission mechanism includes a force transmission chain rope, a pulley and a pulley bracket; There are multiple pulley brackets, which are respectively arranged on the wall surface of the water storage grid; There are multiple pulleys, which are respectively arranged on the corresponding pulley brackets; One end of the force transmission chain rope is connected to the float body; The display mechanism includes a plane scale, a magnetic flap level gauge, a liquid level indicator cursor and a liquid level remote transmission transmitter; The plane scale is arranged in parallel with the magnetic flap level gauge; The liquid level indicating cursor is arranged between the plane scale and the magnetic flap liquid level gauge; The other end of the force transmission chain is connected to the liquid level indicating cursor; The liquid level remote transmission transmitter is arranged on the magnetic flap liquid level gauge and is connected to the control mechanism.

2. The liquid level monitoring application device for confined space according to claim 1 is characterized in that: The float chamber is configured to be cylindrical with a diameter of 200 mm.

3. The liquid level monitoring application device for confined space according to claim 1 is characterized in that: The float chamber is fixed to the side wall of the water storage grid by a fixing mechanism; A through hole is formed at the bottom of the float chamber.

4. The liquid level monitoring application device for confined space according to claim 1 is characterized in that: The pulley bracket is provided with a tuning fork-shaped sprocket support; A pulley bearing for mounting the pulley is embedded in the tuning fork-shaped area on the sprocket support.

5. The liquid level monitoring application device for confined space according to claim 4 is characterized in that: The pulley bearing adopts a ceramic bearing; The fixed shaft of the pulley is made of 316 stainless steel, the outer shaft end is made of fluororubber, and a U-shaped groove for placing the force transmission chain rope is opened radially.

6. The liquid level monitoring application device for confined space according to claim 1 is characterized in that: A guide pulley groove group is provided above the liquid level indicating cursor; The other end of the force transmission chain rope is connected with the liquid level indicating cursor around the guide pulley groove group.

7. The liquid level monitoring application device for confined space according to claim 1 is characterized in that: The display mechanism is arranged in the liquid level mechanism bracket / housing.

8. The liquid level monitoring application device for confined space according to claim 1 is characterized in that: The liquid level indicating cursor is provided with a magnet; The magnet cooperates with the magnetic ball in the magnetic flap level gauge.

9. The liquid level monitoring application device for confined space according to claim 1 is characterized in that: The control mechanism includes a remote control system and a PLC control cabinet; The liquid level remote transmitter is connected to the remote control system via a signal transmission line; The remote control system is connected to the PLC control cabinet via a signal transmission line; The PLC control cabinet is connected to the hydraulically driven water flushing equipment via a signal transmission line.

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