Liquid level temperature integrated detection liquid level meter

Abstract

The application discloses a liquid level temperature integrated detection liquid level meter and relates to the technical field of liquid level and temperature integrated detection.The liquid level temperature integrated detection liquid level meter comprises a sensing rod assembly, a reinforcing core shaft assembly and a signal processing unit, the sensing rod assembly is sequentially spliced in the axial direction by a plurality of unit packaging modules, the unit packaging module comprises a metal sensing shell, a sensing boss is fixedly connected to the middle portion of the lower surface of the metal sensing shell, and a mounting groove is formed in the middle portion of the upper surface of the metal sensing shell, adjacent unit packaging modules are adaptively docked through corresponding sensing bosses and mounting grooves, a heat-sensitive sensing unit is arranged in the unit packaging module, the top unit packaging module is axially spliced with a top end module, and the bottom unit packaging module is axially spliced with a bottom end module, the unit packaging modules are sequentially assembled in the axial direction in a standardized mode, the individual deviation of the measuring points is effectively eliminated, and the overall precision and reliability of the integrated detection are greatly improved.

Description

Technical Field

[0001] This invention relates to the field of integrated liquid level and temperature detection technology, specifically to a liquid level gauge that integrates liquid level and temperature detection. Background Technology

[0002] In industrial settings such as industrial storage tanks, process equipment, and chemical reactors, liquid level and temperature are two key process monitoring parameters. Currently, the industry often assembles liquid level detection equipment and temperature detection equipment separately. This separate deployment increases the number of openings in the tank, complicates on-site wiring, and leads to a large workload for later maintenance and higher overall operating costs. Furthermore, the staggered locations of the two types of equipment mean that liquid level and temperature data at the same height cannot be matched and compared, resulting in weak correlation between monitoring data and hindering comprehensive judgment of process conditions.

[0003] Existing integrated liquid level and temperature monitoring devices on the market still have many shortcomings: Firstly, integrated equipment with moving mechanical components suffers from poor operational stability. These products often rely on float-type or magnetic level gauges with added temperature probes for integrated monitoring. During operation, floats are prone to jamming and stagnation, magnets may demagnetize over time, and moving parts may experience continuous wear. The probability of failure increases significantly under conditions involving viscous, corrosive, or solid impurity media. Furthermore, the equipment only has a single temperature measurement point, making it impossible to collect the complete temperature distribution along the height of the tank.

[0004] Secondly, the existing integrated thermal detection devices suffer from inadequate mechanical design. Devices relying on the thermal effects of thermistors distinguish the phase of a medium by the difference in thermal conductivity between gas and liquid phases. The thermistor itself can simultaneously acquire temperature data, making it more versatile and adaptable to various media. However, current product development focuses on the detection circuit and data processing program, neglecting the supporting role of the mechanical structure for the sensing element. Thermistors lack standardized packaging and assembly structures, resulting in significant differences in assembly gaps and contact thermal resistance at different measuring points. Furthermore, the temperature rise benchmark for each sensing unit cannot be unified, directly reducing the accuracy of liquid surface boundary identification.

[0005] In summary, the industry urgently needs an integrated liquid level and temperature detection level gauge with a structure that provides support and ensures uniform heat exchange performance at all measuring points. This gauge should fully leverage the detection performance of the thermal element through its supporting structure, thereby comprehensively improving the overall measurement accuracy and long-term operational reliability of the equipment. Summary of the Invention

[0006] The purpose of this invention is to provide a liquid level gauge that integrates liquid level and temperature detection, so as to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a liquid level gauge for integrated liquid level and temperature detection, comprising a sensing rod assembly, a reinforcing spindle assembly, and a signal processing unit; The sensing rod assembly is composed of several unit packaging modules sequentially spliced ​​along the axial direction; The unit packaging module includes a metal sensing housing, a sensing boss is fixedly connected to the middle of the lower surface of the metal sensing housing, and a mounting groove is formed in the middle of the upper surface of the metal sensing housing; adjacent unit packaging modules are connected by corresponding sensing bosses and mounting grooves; the space between the sensing boss and the mounting groove is filled with thermally conductive epoxy resin and sealed and fixed by laser full welding. The unit packaging module has a built-in thermal sensing unit, which includes a thermistor, a thermally conductive silicone grease layer, and a ceramic insulating bushing from the inside out. The top unit packaging module is axially spliced ​​to the top module, and the bottom unit packaging module is axially spliced ​​to the bottom module; Encapsulation components are welded between the unit packaging modules, between the unit packaging module and the top module, and between the unit packaging module and the bottom module. The reinforced mandrel assembly includes a solid mandrel, a splicing sleeve, and a mounting cover assembly; The mounting cover assembly includes a main cover; the solid spindle includes a shaft body, which is coaxially mounted on the main cover; a heat dissipation neck is assembled between the shaft body and the main cover; the heat dissipation neck is machined with heat dissipation fins to increase the air convection heat dissipation area; a wiring sleeve is installed under the heat dissipation neck, and the wiring sleeve is correspondingly sleeved onto the top module of the sensing rod assembly. The upper end of the shaft is fixedly connected to a signal processing unit, and the signal processing unit is electrically connected to a thermal sensing unit. The splicing sleeve connects the solid mandrel and the sealing sleeve assembly.

[0008] As a preferred embodiment of the present invention, the port edge of the mounting groove is extended with an overflow groove for filling thermally conductive epoxy adhesive.

[0009] In a preferred embodiment of the present invention, the ceramic insulating bushing is embedded in the metal sensing housing; the thermistor has a bead-like structure and is embedded in the ceramic insulating bushing; a thermally conductive silicone grease layer is filled between the thermistor and the ceramic insulating bushing. The ceramic insulating bushing has a microcrystalline ceramic heat insulation pad nested at its end to block the axial heat conduction path of the thermal sensing unit. The thermistor is connected to leads at both the top and bottom. The upper lead passes through the thermal grease layer, the microcrystalline ceramic heat insulation pad and the metal sensing shell in sequence and is flush with the bottom wall of the mounting groove. The lower lead passes through the thermal grease layer, the microcrystalline ceramic heat insulation pad and the metal sensing shell in sequence and is fixed to the sensing boss. The thermistor is fixedly connected to heat-conducting pillars at equal intervals on its sides. The heat-conducting pillars pass through the thermal grease layer and the ceramic insulating bushing in sequence and are in contact with the metal sensing shell.

[0010] As a preferred embodiment of the present invention, the top module includes a top rod, and an assembly boss identical to the sensing boss is fixedly connected to the middle of the lower surface of the top rod; a top wire penetrating the top rod is fixedly connected to the upper surface of the assembly boss; the top wire is connected to a wiring sleeve. The top module and the unit packaging module are adapted to be connected by corresponding mounting bosses and mounting grooves; the mounting boss and the mounting groove are filled with thermally conductive epoxy resin and sealed and fixed by laser full welding. The bottom module includes a bottom rod, and the upper surface of the bottom rod has an assembly groove in the middle that is the same as the mounting groove. The bottom module and the unit packaging module are connected by corresponding sensing bosses and assembly grooves; the space between the sensing bosses and the assembly grooves is filled with thermally conductive epoxy resin and sealed and fixed by laser full welding.

[0011] As a preferred embodiment of the present invention, the envelope assembly includes a corresponding welded envelope, with hanging posts fixedly connected to both sides of the envelope, and hanging plates fixedly connected to the ends of the hanging posts.

[0012] As a preferred embodiment of the present invention, the heat dissipation neck is provided with a fitting for fastening the shaft. A bottom piece is fixedly connected to the lower end of the shaft. The shaft body has slots evenly spaced on its sides.

[0013] As a preferred embodiment of the present invention, the splicing sleeve is composed of four sets of arc-shaped strips inserted sequentially; the arc-shaped strips are provided with insertion holes, the upper part of the insertion holes is adapted to hangers, and the lower part of the insertion holes is adapted to hangers. The hanging piece of the envelope assembly is inserted through the upper part of the socket, and the hanging post is embedded in the lower part of the socket; The inner side of the arc-shaped strip is provided with a clip that is adapted to the sleeve hanging post, and the clip and the hanging piece are in contact. The shaft body is correspondingly inserted into the splicing sleeve, and the bottom part and the splicing sleeve are connected; the locking strip is adapted to be embedded in the locking groove and locked.

[0014] As a preferred embodiment of the present invention, a fixed cover is movably sleeved on the outside of the main cover, and the fixed cover is installed on a container holding liquid; a motor for driving the main cover to rotate is installed on the fixed cover; and a cleaning brush for cleaning the sensor rod assembly is fixedly connected under the fixed cover.

[0015] Compared with the prior art, the beneficial effects of the present invention are: A liquid level gauge integrating liquid level and temperature detection is provided. It is assembled axially through standardized unit packaging modules, which unifies the installation gap and assembly benchmark of the thermal sensing points, effectively eliminating individual deviations of the sensing points. This ensures that the heat conduction efficiency, temperature response speed and steady-state heat exchange capacity of all thermal sensing points remain highly uniform and consistent, greatly improving the overall accuracy and reliability of the integrated dual-parameter detection.

[0016] A liquid level gauge integrating liquid level and temperature detection is provided. The unit package module has a built-in thermal sensing unit. The positions of each thermal sensing point are uniform and the arrangement is regular, which avoids the reading deviation of the liquid level boundary position caused by the displacement of the measuring point and ensures uniform and stable liquid level resolution throughout the entire range.

[0017] A level gauge integrating liquid level and temperature detection has an overflow groove extending outward from the port edge of the mounting groove for filling with thermally conductive epoxy resin. After the resin cures, it eliminates the air gap between the mounting groove and the sensing boss, effectively reducing contact thermal resistance and ensuring that the heat of the medium can be efficiently transferred to the internal thermistor sensing unit. This makes the heat exchange conditions at each measuring point more consistent, reduces the temperature rise baseline difference between different measuring points, improves the reliability of liquid level identification based on the gas-liquid heat transfer difference principle, and improves the accuracy of medium temperature measurement.

[0018] A liquid level gauge integrating liquid level and temperature detection uses a standardized assembly method for the unit packaging module, top module, and bottom module of the sensing rod assembly. Each thermal sensing point is precisely fixed and limited by curing with thermally conductive epoxy adhesive, which can effectively constrain the radial and axial displacement of the unit packaging module, significantly reduce the probability of equipment failure, adapt to various harsh industrial conditions, and significantly extend the overall service life of the sensor.

[0019] A liquid level gauge integrating liquid level and temperature detection is provided. The unit packaging modules can be assembled sequentially by sensing bosses and mounting grooves to form the main measuring rod. The number of unit packaging modules can be adjusted according to the liquid level space to be measured, flexibly changing the effective measurement height of the measuring rod and improving the versatility of the device for different measurement ranges and working conditions.

[0020] A liquid level gauge integrating liquid level and temperature detection adopts a composite structure composed of a sensing rod assembly and a reinforced spindle assembly. The structure has strong overall integrity and excellent bending resistance, which greatly improves the overall bending stiffness of the sensing rod assembly. It can stably maintain the axial geometric position accuracy of each thermal detection point, avoid liquid level and temperature detection errors caused by deformation, and greatly improve the stability and accuracy of integrated detection under long-range conditions.

[0021] A level gauge integrating liquid level and temperature detection is provided, with standardized and modular assembly. Two or more sets of sensor rod assemblies can be arranged on the outside of the splicing sleeve to conduct comparative measurements of liquid level and medium temperature in the same measurement area. By cross-checking the data from multiple measurement points, random errors are effectively reduced, and the accuracy of the integrated liquid level and temperature detection results is further improved.

[0022] A liquid level gauge integrating liquid level and temperature detection can lock the hanging column under the limit of the slot, enhance the stability of the connection between the sealing assembly and the splicing sleeve, and thus achieve bidirectional positioning and locking; effectively restrict the circumferential rotation and axial movement of the shaft, avoid its deviation and loosening, ensure the high fit of the inner and outer structures and uniform stress, further enhance the overall structural strength, and improve the overall structural assembly accuracy and firmness.

[0023] A liquid level gauge integrating liquid level and temperature detection, by movably sleeved with a fixed cover outside the main body cover, can periodically start the motor on the fixed cover, thereby causing the main body cover to drive the reinforcing spindle assembly to rotate. Since the splicing sleeve connects the solid spindle and the sealing sleeve assembly, it drives the sensing rod assembly to rotate synchronously around the solid spindle. With the help of the cleaning brush connected under the fixed cover, the surface of the sensing rod assembly can be cleaned with liquid, improving the self-cleaning ability. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a bottom view of the structure of the present invention; Figure 3 This is a schematic diagram of the signal processing unit of the present invention; Figure 4 This is a schematic diagram of the wiring sleeve of the present invention; Figure 5 This is a schematic diagram of the fixing cover of the present invention; Figure 6 This is a schematic diagram of the splicing sleeve assembly of the present invention; Figure 7 This is a schematic diagram of the unit packaging module of the present invention; Figure 8 This is a schematic diagram of the top module of the present invention; Figure 9 This is a schematic diagram of the bottom module of the present invention; Figure 10 This is a schematic diagram of the envelope assembly of the present invention; Figure 11 This is a schematic diagram of the splicing sleeve structure of the present invention; Figure 12 This is a schematic diagram of the card slot alignment in this invention.

[0025] In the picture: 1. Unit packaging module; 101. Metal sensor housing; 102. Sensor boss; 103. Mounting groove; 104. Glue overflow groove; 2. Thermistor unit; 201. Thermistor; 202. Thermal grease layer; 203. Ceramic insulating bushing; 204. Microcrystalline ceramic heat insulation pad; 205. Lead wire; 206. Thermal conductive pillar; 3. Top module; 301. Top rod; 302. Assembly boss; 303. Top wiring; 4. Bottom module; 401. Bottom rod; 402. Assembly groove; 5. Enclosure assembly; 501. Enclosure; 502. Hanging post; 503. Hanging plate; 6. Solid spindle; 601. Shaft body; 602. Assembly parts; 603. Wiring sleeve; 604. Base piece; 605. Slot; 7. Splicing sleeve; 701. Curved strip; 702. Insertion hole; 703. Locking strip; 8. Mounting cover assembly; 801. Main cover; 802. Heat dissipation neck; 803. Fixing cover; 804. Motor; 805. Cleaning brush; 9. Signal processing unit. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Example: Please refer to Figures 1-12 A level gauge for integrated liquid level and temperature detection includes a sensing rod assembly, a reinforcing spindle assembly, and a signal processing unit 9; The sensing rod assembly is composed of several unit packaging modules 1 spliced ​​together along the axial direction; The unit packaging module 1 includes a metal sensing housing 101. A sensing boss 102 is fixedly connected to the middle of the lower surface of the metal sensing housing 101, and a mounting groove 103 is formed in the middle of the upper surface of the metal sensing housing 101. Both the sensing boss 102 and the mounting groove 103 adopt a stepped structure. Adjacent unit packaging modules 1 are matched and connected through corresponding sensing bosses 102 and mounting grooves 103. The space between the sensing bosses 102 and the mounting grooves 103 is filled with thermally conductive epoxy resin and sealed and fixed by laser full welding. The unit packaging module 1 has a built-in thermal sensing unit 2, which includes a thermistor 201, a thermally conductive silicone grease layer 202, and a ceramic insulating bushing 203 from the inside to the outside. The top unit packaging module 1 is axially spliced ​​to the top module 3, and the bottom unit packaging module 1 is axially spliced ​​to the bottom module 4; A sleeve assembly 5 is welded between unit packaging modules 1, between unit packaging module 1 and top module 3, and between unit packaging module 1 and bottom module 4; The reinforced mandrel assembly includes a solid mandrel 6, a splicing sleeve 7, and a mounting cover assembly 8; Mounting cover assembly 8 includes a main cover 801; solid spindle 6 includes a shaft 601, which is coaxially mounted on the main cover 801. A heat dissipation neck 802 is assembled between the shaft 601 and the main cover 801. The heat dissipation neck 802 is machined with heat dissipation fins to increase the air convection heat dissipation area; a wiring sleeve 603 is installed under the heat dissipation neck 802, and the wiring sleeve 603 is correspondingly sleeved on the top module 3 of the sensing rod assembly. The upper end of the shaft 601 is fixedly connected to the signal processing unit 9, which is electrically connected to the thermal sensing unit 2. It is used to control the temperature measurement mode and the heating liquid level detection mode, and to complete the temperature calculation, liquid level identification and data output. The splicing sleeve 7 connects the solid mandrel 6 and the sealing assembly 5.

[0028] The port edge of the mounting groove 103 is extended with an overflow groove 104 for filling thermally conductive epoxy.

[0029] The ceramic insulating bushing 203 is embedded in the metal sensing housing 101; the thermistor 201 adopts a bead-like structure and is embedded in the ceramic insulating bushing 203; the thermistor 201 and the ceramic insulating bushing 203 are filled with a thermally conductive silicone grease layer 202, which completely fills the air gap, eliminates air thermal resistance, and ensures the thermal conduction efficiency of the thermistor 201. The ceramic insulating bushing 203 has a microcrystalline ceramic heat insulation pad 204 nested at its end, which is used to block the axial heat conduction path of the thermal sensing unit 2. The thermistor 201 is connected to leads 205 at both the top and bottom. The upper lead 205 passes through the thermal grease layer 202, the microcrystalline ceramic heat insulation pad 204 and the metal sensing shell 101 in sequence and is flush with the bottom wall of the mounting groove 103. The lower lead 205 passes through the thermal grease layer 202, the microcrystalline ceramic heat insulation pad 204 and the metal sensing shell 101 in sequence and is fixed to the sensing boss 102. Thermistor 201 is fixedly connected to heat-conducting pillars 206 at equal intervals on the side. The heat-conducting pillars 206 pass through the thermal grease layer 202 and the ceramic insulating bushing 203 in sequence and are in contact with the metal sensing housing 101.

[0030] The top module 3 includes a top rod 301. A mounting boss 302 identical to the sensing boss 102 is fixedly connected to the middle of the lower surface of the top rod 301. A top wire 303 passing through the top rod 301 is fixedly connected to the upper surface of the mounting boss 302. The top wire 303 is connected to the wiring sleeve 603. Top module 3 and unit packaging module 1 are matched and connected by corresponding mounting bosses 302 and mounting grooves 103; thermally conductive epoxy glue is filled between mounting bosses 302 and mounting grooves 103 and the two are sealed and fixed by laser full welding. The bottom module 4 includes a bottom rod 401, and the upper surface of the bottom rod 401 has an assembly groove 402 that is the same as the mounting groove 103 in the middle. The bottom module 4 and the unit packaging module 1 are matched and connected through the corresponding sensing boss 102 and the assembly groove 402; the sensing boss 102 and the assembly groove 402 are filled with thermally conductive epoxy glue and sealed and fixed by laser full welding.

[0031] The envelope assembly 5 includes a corresponding welded envelope 501, with hanging posts 502 fixedly connected to both sides of the envelope 501, and hanging plates 503 fixedly connected to the ends of the hanging posts 502.

[0032] The heat dissipation neck 802 is provided with a mounting accessory 602 for fastening the shaft 601; The lower end of the shaft 601 is fixedly connected to the bottom part 604; The shaft 601 has slots 605 evenly spaced on its sides.

[0033] The splicing sleeve 7 is composed of four sets of arc-shaped strips 701 inserted in sequence; the arc-shaped strips 701 are provided with insertion holes 702, the upper part of the insertion hole 702 is adapted to the hanging piece 503, and the lower part of the insertion hole 702 is adapted to the hanging post 502. The hanging piece 503 of the envelope assembly 5 is inserted through the upper part of the socket 702, and the hanging post 502 is embedded in the lower part of the socket 702; The inner side of the arc-shaped strip 701 is provided with a clip 703 that is adapted to the clip hanging post 502, and the clip 703 and the hanging piece 503 are connected. The shaft 601 is inserted into the splicing sleeve 7, and the bottom part 604 and the splicing sleeve 7 are connected; the locking strip 703 is fitted into the locking groove 605 and locked.

[0034] A fixed cover 803 is movably sleeved on the outside of the main cover 801. The fixed cover 803 is installed on the container holding the liquid. A motor 804 for driving the main cover 801 to rotate is installed on the fixed cover 803. A cleaning brush 805 for cleaning the sensor rod assembly is fixedly connected to the bottom of the fixed cover 803.

[0035] The working principle of this invention is as follows: The signal processing unit 9 is located at the upper end of the shaft 601 and adopts a time-division multiplexing working mechanism to avoid interference with temperature measurement during the heating process; Temperature measurement mode: The signal processing unit 9 collects the natural resistance value of the thermistor 201 and calculates the medium temperature at each measuring point through the pre-stored resistance value; in the liquid phase region, the average value of multiple measuring points is taken as the medium temperature, and in the gas phase region, layered temperature data can be output, and finally the temperature field distribution in the vertical direction inside the tank is obtained.

[0036] Liquid level detection mode: After heating the current measuring point to a thermal steady state, the steady-state resistance value is collected, and the steady-state temperature rise is calculated. The temperature rise is compared with the calibrated phase threshold. If the temperature rise is less than the threshold, it is determined to be the liquid phase; if it is greater than the threshold, it is determined to be the gas phase. After traversing all measuring points, the gas-liquid phase boundary is identified, and linear interpolation is performed based on the temperature rise data of adjacent measuring points to obtain the liquid level height.

[0037] The sensing rod assembly is composed of several unit packaging modules 1 spliced ​​together along the axial direction. By assembling the standardized unit packaging modules 1 axially, the installation gap and assembly benchmark of the thermal sensing points are unified, effectively eliminating individual deviations of the sensing points. This ensures that the heat conduction efficiency, temperature response speed, and steady-state heat transfer capacity of all thermal sensing points remain highly uniform and consistent. It avoids the temperature measurement error and temperature rise baseline deviation caused by the difference in heat transfer performance of different sensing points. It provides a stable and unified mechanical heat transfer benchmark for liquid level identification based on the gas-liquid two-phase thermal conductivity temperature difference principle and for high-precision medium temperature detection across the entire range, significantly improving the overall accuracy and reliability of the integrated dual-parameter detection.

[0038] Adjacent unit encapsulation modules 1 are matched and connected through corresponding sensing bosses 102 and mounting grooves 103; this allows the unit encapsulation modules 1 to be stacked sequentially along the axial direction, thereby strictly controlling the cumulative error of the spacing and stably establishing the spatial coordinate reference for liquid level measurement; the unit encapsulation module 1 has a built-in thermal sensing unit 2, and the positions of each thermal sensing point are uniform and the arrangement is regular, avoiding the liquid level boundary position judgment deviation caused by the offset of the measuring point, and ensuring uniform and stable liquid level resolution throughout the entire range.

[0039] Both the sensing boss 102 and the mounting groove 103 adopt a stepped structure. When the unit packaging module 1 is added sequentially, thermally conductive epoxy is filled between the sensing boss 102 and the mounting groove 103. The port edge of the mounting groove 103 has an overflow groove 104 for filling thermally conductive epoxy. After it is cured, the air gap between the mounting groove 103 and the sensing boss 102 is eliminated, effectively reducing the contact thermal resistance and ensuring that the heat of the medium can be efficiently transferred to the internal thermal sensing unit 2. This makes the heat exchange conditions of each measuring point more consistent, reduces the temperature rise baseline difference between different measuring points, improves the reliability of liquid level identification based on the gas-liquid heat transfer difference principle, and improves the accuracy of medium temperature measurement.

[0040] The unit packaging module 1, top module 3, and bottom module 4 of the sensing rod assembly adopt a standardized assembly method, precisely fixing each thermistor measuring point and limiting its position through curing with thermally conductive epoxy adhesive. This effectively constrains the radial and axial displacement of the unit packaging module 1, resisting interference from complex working conditions such as media erosion and equipment vibration, and completely avoiding problems such as loosening, offsetting, and falling off of the measuring points. Long-term use ensures consistent accuracy of the measuring point installation position. Simultaneously, the connection of the sensing rod assembly adopts a laser-welded, fully sealed structure, completely isolating the thermistor unit 2 from the external medium, effectively preventing the intrusion of liquids, moisture, and corrosive media. This eliminates failure problems such as moisture, corrosion, and short circuits of the thermistor 201, significantly reducing the probability of equipment failure, adapting to various harsh industrial conditions, and significantly extending the overall service life of the sensor.

[0041] The sensing rod assembly is integrated into a single component by welding the encapsulation module 5 after assembly of the unit packaging module 1, the top module 3 and the bottom module 4, resulting in a small number of parts. The unit packaging module 1 can be assembled sequentially with the sensing boss 102 and the mounting groove 103 to form the main measuring rod. The number of unit packaging modules 1 can be adjusted according to the liquid level space to be measured, flexibly changing the effective measurement height of the detection rod and improving the versatility of the device for different measurement ranges and working conditions.

[0042] The splicing sleeve 7 connects the solid mandrel 6 and the sealing assembly 5. It adopts a composite structure composed of the sensing rod assembly and the reinforced mandrel assembly. Both ends of the shaft 601 are fixed to the mounting cover assembly 8 and the bottom part 604. The structure has strong integrity and excellent bending resistance, which greatly improves the overall bending stiffness of the sensing rod assembly. Especially for long-range measurement conditions, it can effectively resist the bending load caused by the impact and vibration of the medium fluid, eliminate problems such as deflection of the long rod and displacement of the measuring point, and stably maintain the axial geometric position accuracy of each thermal detection measuring point. It avoids the liquid level and temperature detection errors caused by deformation, and greatly improves the stability and accuracy of integrated detection under long-range conditions.

[0043] The hanging post 502 of the sleeve assembly 5, together with the arc-shaped strip 701 and the clamping strip 703 of the splicing sleeve 7, form a splicing structure. The four sets of arc-shaped strips 701 can be spliced ​​to form a sleeve structure. The hanging posts 502 on the same side axial direction are uniformly hung and quickly clamped and fixed with the clamping strip 703. The assembly mode is standardized and modular. Two or more sets of sensing rod assemblies can be arranged on the outside of the splicing sleeve 7 to carry out comparative measurements of liquid level and medium temperature in the same measurement area. By cross-checking the data from multiple measurement points, random errors are effectively reduced, and the accuracy of the integrated detection results of liquid level and temperature is further improved.

[0044] The shaft 601 has a precisely cut groove 605 corresponding to the position of the retaining strip 703, which can form a precise fitting position with the retaining strip 703. With the assembly structure of the arc-shaped strip 701 and the hanging post 502, the hanging post 502 can be locked under the limit of the groove 605, which can enhance the stability of the connection between the cover assembly 5 and the splicing sleeve 7, thereby achieving bidirectional positioning and locking; effectively restricting the circumferential rotation and axial movement of the shaft 601, avoiding its deviation and loosening, ensuring that the inner and outer structures are highly fitted and the force is uniform, further strengthening the overall structural strength, and improving the overall structural assembly accuracy and firmness.

[0045] By movably connecting the fixed cover 803 to the outside of the main cover 801, the motor 803 on the fixed cover 803 can be started at regular intervals, thereby causing the main cover 801 to drive the reinforcing spindle assembly to rotate. Since the splicing sleeve 7 connects the solid spindle 6 and the sealing sleeve assembly 5, it drives the sensing rod assembly to rotate synchronously around the solid spindle 6. With the help of the cleaning brush 805 connected under the fixed cover 803, the surface of the sensing rod assembly can be cleaned with liquid, improving the self-cleaning ability.

[0046] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A level gauge for integrated liquid level and temperature detection, comprising a sensing rod assembly, a reinforcing spindle assembly, and a signal processing unit (9); Its features are: The sensing rod assembly is composed of several unit packaging modules (1) sequentially spliced ​​along the axial direction; The unit packaging module (1) includes a metal sensing shell (101), a sensing boss (102) is fixedly connected to the middle of the lower surface of the metal sensing shell (101), and a mounting groove (103) is provided in the middle of the upper surface of the metal sensing shell (101); adjacent unit packaging modules (1) are adapted to be connected through corresponding sensing bosses (102) and mounting grooves (103); the space between the sensing bosses (102) and the mounting grooves (103) is filled with thermally conductive epoxy resin and sealed and fixed by laser full welding; The unit packaging module (1) has a built-in thermal sensing unit (2), which includes a thermistor (201), a thermal grease layer (202), and a ceramic insulating bushing (203) from the inside to the outside. The top unit packaging module (1) is axially spliced ​​with the top module (3), and the bottom unit packaging module (1) is axially spliced ​​with the bottom module (4). Enclosure components (5) are welded between the unit packaging modules (1), between the unit packaging module (1) and the top module (3), and between the unit packaging module (1) and the bottom module (4). The reinforced mandrel assembly includes a solid mandrel (6), a splicing sleeve (7), and a mounting cover assembly (8). The mounting cover assembly (8) includes a main cover (801); the solid spindle (6) includes a shaft (601), which is coaxially mounted on the main cover (801). A heat dissipation neck (802) is assembled between the shaft (601) and the main cover (801). The heat dissipation neck (802) is machined with heat dissipation fins to increase the air convection heat dissipation area. A wiring sleeve (603) is installed under the heat dissipation neck (802), and the wiring sleeve (603) is correspondingly sleeved on the top module (3) of the sensing rod assembly. The upper end of the shaft (601) is fixedly connected to the signal processing unit (9), and the signal processing unit (9) is electrically connected to the thermal sensing unit (2). The splicing sleeve (7) connects the solid mandrel (6) and the sealing assembly (5).

2. The level gauge for integrated liquid level and temperature detection according to claim 1, characterized in that: The mounting groove (103) has an overflow groove (104) extending outward from the port edge for filling thermally conductive epoxy adhesive.

3. The level gauge for integrated liquid level and temperature detection according to claim 1, characterized in that: The ceramic insulating bushing (203) is embedded in the metal sensing housing (101); the thermistor (201) adopts a bead structure and is embedded in the ceramic insulating bushing (203); the thermistor (201) and the ceramic insulating bushing (203) are filled with a thermally conductive silicone grease layer (202). The ceramic insulating bushing (203) has a microcrystalline ceramic heat insulation pad (204) nested at its end, which is used to block the axial heat conduction path of the thermal sensing unit (2). The thermistor (201) is connected to leads (205) at both the top and bottom. The upper lead (205) passes through the thermal grease layer (202), the microcrystalline ceramic heat insulation pad (204) and the metal sensing shell (101) in sequence and is flush with the bottom wall of the mounting groove (103). The lower lead (205) passes through the thermal grease layer (202), the microcrystalline ceramic heat insulation pad (204) and the metal sensing shell (101) in sequence and is fixed to the sensing boss (102). The thermistor (201) is laterally and uniformly fixedly connected with heat-conducting pillars (206), which sequentially penetrate the thermal grease layer (202) and the ceramic insulating bushing (203) and are in contact with the metal sensing shell (101).

4. The level gauge for integrated liquid level and temperature detection according to claim 2, characterized in that: The top module (3) includes a top rod (301), and an assembly boss (302) identical to the sensing boss (102) is fixedly connected to the middle of the lower surface of the top rod (301); a top wire (303) passing through the top rod (301) is fixedly connected to the upper surface of the assembly boss (302); the top wire (303) is connected to the wiring sleeve (603); The top module (3) and the unit packaging module (1) are adapted to be connected through corresponding mounting bosses (302) and mounting grooves (103); the mounting bosses (302) and mounting grooves (103) are filled with thermally conductive epoxy resin and sealed and fixed by laser full welding; The bottom module (4) includes a bottom rod (401), and the upper surface of the bottom rod (401) has an assembly groove (402) that is the same as the mounting groove (103) in the middle. The bottom module (4) and the unit packaging module (1) are adapted to be connected through corresponding sensing bosses (102) and assembly grooves (402); the sensing bosses (102) and assembly grooves (402) are filled with thermally conductive epoxy resin and sealed and fixed by laser full welding.

5. The level gauge for integrated liquid level and temperature detection according to claim 1, characterized in that: The envelope assembly (5) includes a corresponding welded envelope (501), with a hanging post (502) fixedly connected to both sides of the envelope (501), and a hanging piece (503) fixedly connected to the end of the hanging post (502).

6. A level gauge for integrated liquid level and temperature detection according to claim 5, characterized in that: The heat dissipation neck (802) is provided with a fitting (602) for fastening the shaft (601). The lower end of the shaft (601) is fixedly connected to the bottom piece (604). The shaft (601) has slots (605) evenly spaced on its sides.

7. A level gauge for integrated liquid level and temperature detection according to claim 6, characterized in that: The splicing sleeve (7) is composed of four sets of arc-shaped strips (701) inserted in sequence; the arc-shaped strips (701) are provided with insertion holes (702), the upper part of the insertion hole (702) is adapted to the hanging piece (503), and the lower part of the insertion hole (702) is adapted to the hanging post (502). The hanging piece (503) of the envelope assembly (5) is inserted through the upper part of the socket (702), and the hanging post (502) is embedded in the lower part of the socket (702); The inner side of the arc-shaped strip (701) is provided with a clip (703) that is adapted to the clip hanging post (502), and the clip (703) and the hanging piece (503) are in contact. The shaft (601) is inserted into the splicing sleeve (7), and the bottom piece (604) and the splicing sleeve (7) are connected; the locking strip (703) is fitted into the locking groove (605) and locked.

8. A level gauge for integrated liquid level and temperature detection according to claim 7, characterized in that: A fixed cover (803) is movably sleeved on the outside of the main cover (801), and the fixed cover (803) is installed on the container holding the liquid; a motor (804) for driving the main cover (801) to rotate is installed on the fixed cover (803); a cleaning brush (805) for cleaning the sensor rod assembly is fixedly connected under the fixed cover (803).

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