CN219608156U

CN219608156U - Durable type is detection electrode for level sensor

Info

Publication number: CN219608156U
Application number: CN202320217056.7U
Authority: CN
Inventors: 阿部宏; 方鹏
Original assignee: Kangtuo Technology Taicang Co ltd
Current assignee: Kangtuo Technology Taicang Co ltd
Priority date: 2023-02-15
Filing date: 2023-02-15
Publication date: 2023-08-29
Anticipated expiration: 2033-02-15

Abstract

The utility model is suitable for the technical field of liquid level sensors, and provides a detection electrode for a durable liquid level sensor, which comprises a protection tube with an open top end and a signal processing plate, a conductor arranged in an inner cavity of the protection tube, wherein one end of the conductor is positioned in the inner cavity of the protection tube, and a cable arranged on the surface of the conductor.

Description

Durable type is detection electrode for level sensor

Technical Field

The utility model belongs to the technical field of liquid level sensors, and particularly relates to a detection electrode for a durable liquid level sensor.

Background

The liquid level sensor is also called a water level sensor, and is mainly divided into a contact type liquid level transmitter, a magnetic liquid level transmitter, a capacitive liquid level transmitter, a magnetostrictive liquid level transmitter and the like. The non-contact type liquid level transmitter is mainly an ultrasonic liquid level transmitter, a radar liquid level transmitter and the like.

The capacitive liquid level sensor is a medium-changing capacitor which utilizes the change of the measured medium surface to cause the capacitance change, and the capacitive liquid level sensor has wide application in household appliances and industrial automatic production. The principle of the automatic feeding production line is that the capacitance detection chip is used for signal processing by detecting the tiny capacitance difference change caused by liquid level change, and various signal communication protocols such as iq, bcd, pwm, iic and the like can be output.

However, the existing capacitive induction type liquid level sensor mainly comprises an insulating sleeve, an inner electrode and an outer electrode, and then the insulating sleeve, the inner electrode and the outer electrode are inserted into conductive liquid for detection, however, the existing electrodes are complicated in subsequent installation and maintenance, cannot be used simply, single-electrode detection cannot be completed, meanwhile, the existing sleeve is easy to cause corrosion in high-temperature liquid, cannot be used for a long time, and has a short service life.

Disclosure of Invention

In order to solve the technical problems, the utility model provides the advantages of single electrode detection, high temperature resistance and corrosion resistance of the sleeve.

In order to achieve the above purpose, the technical scheme of the utility model is as follows:

the utility model provides a durable type liquid level sensor is with detecting electrode, includes that the top is open protection pipe 1 and signal processing board 3, its characterized in that: the cable protection device comprises a conductor 10 arranged in the inner cavity of a protection tube 1, wherein one end of the conductor 10 is positioned in the inner cavity of the protection tube 1, a cable 2 arranged on the surface of the conductor 10, a signal processing plate 3 is arranged at the other end of the conductor 10, and an insulating packaging material 4 used for packaging the cable 2 is arranged at the bottom end of the inner cavity of the protection tube 1.

As a preferred scheme of the utility model, the surface of the protection tube 1 is provided with a supporting mechanism for supporting protection, the supporting mechanism comprises a supporting seat 5 arranged at the bottom end of the protection tube 1 and a positioning seat 6 arranged at the top end of the surface of the protection tube 1, a through hole for the protection tube 1 to penetrate through is formed in the surface of the positioning seat 6, a containing groove matched with the bottom end of the protection tube 1 is formed in the surface of the supporting seat 5 in an inwards concave manner, and rubber rings matched with the protection tube 1 are fixedly connected with inner cavities of the containing groove and the through hole.

As a preferred embodiment of the present utility model, a capacitor of 30pf is provided on the surface of the signal processing board 3, a measurement chip is provided on the surface of the signal processing board 3, and the conductor 10 is electrically connected to the capacitor, and the capacitor is electrically connected to the measurement chip.

As a preferable scheme of the utility model, the top end of the protection tube 1 is detachably provided with a sealing cover 7, the bottom of the sealing cover 7 is fixedly connected with a thread sleeve 8, and the top of the inner wall surface of the protection tube 1 is provided with threads matched with the thread sleeve 8.

As a preferable mode of the present utility model, the inner cavity of the sealing cover 7 is provided with a sealing member 9 for sealing, and the sealing member 9 is made of rubber.

As a preferable mode of the present utility model, the diameter of the protective tube 1 is 20mm, the inner diameter of the protective tube 1 is 10mm, and the length of the protective tube 1 is 350mm.

Advantageous effects

In summary, the utility model has the following beneficial effects: according to the detection electrode for the durable liquid level sensor, when detection is needed, the device is inserted into liquid, the liquid and the protection tube 1 form an external electrode, when one part of the protection tube 1 is immersed by the liquid, the increment of capacitance is in direct proportion to the immersed length of the electrode, detected data are input to the capacitor on the signal processing board 3 through the conductor 10 and are input to the measuring chip on the signal processing board 3 through the capacitor, the detected data are analyzed and transmitted through the measuring chip, the effect of the single electrode on the real-time detection of the liquid level is achieved, meanwhile, the protection tube 1 is made of ceramic, and the insulation of the ceramic is ensured to be greater than that of the metal shell, and the protection tube is resistant to high temperature about 1000 and corrosion, and the service life is ensured.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic elevational view of the structure of the present utility model.

Fig. 2 is a schematic top view of the structure of the present utility model.

Fig. 3 is a schematic cross-sectional view of the cable and conductor of the present utility model.

1. A protective tube; 2. a cable; 3. a signal processing board; 4. an insulating encapsulation material; 5. a support base; 6. a positioning seat; 7. sealing cover; 8. a thread sleeve; 9. a seal; 10. a conductor.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

The utility model provides a durable type detection electrode for level sensor, as shown in fig. 1 through 3, including top for open protection tube 1 and signal processing board 3, locate the conductor 10 of protection tube 1 inner chamber, the one end of conductor 10 is located the inner chamber of protection tube 1, locates cable 2 on conductor 10 surface, and signal processing board 3 locates the other end of conductor 10, and the bottom of protection tube 1 inner chamber is equipped with the insulating encapsulation material 4 that is used for encapsulating cable 2.

The capacitive liquid level sensor converts the liquid level into capacitance change by utilizing different dielectric constants of the measured liquid and surrounding medium to represent the magnitude of an input signal so as to realize the measurement of the liquid level, and has a plurality of advantages: the capacitive liquid level sensor is simple in structure, high in sensitivity, high in resolution and small in size, can work in severe environments such as high temperature, radiation and strong vibration, is applicable to water level control of the water tank, and is beneficial to improving the control accuracy and reducing the cost.

The capacitive liquid level sensor is widely applied to household appliances and industrial automatic production. Such as humidifiers, mopping machines, water purifiers, coffee machines, water dispensers, water heaters, automatic feeding production lines, etc., the capacitive liquid level sensor can also be used on automobiles, and effectively protects the safe running of automobiles.

When the device is inserted into a conductive liquid in a container, assuming that the dielectric constant of the intermediate medium is epsilon 3 and the immersed length of the electrode is l, the capacitor has a capacitance of the same, wherein: r and R are the outer radius of the insulating cover layer and the outer radius of the inner electrode, respectively. Since ε3 is a constant, C is proportional to l, and if a portion of the electrode is immersed in a liquid (non-conductive) having a dielectric constant ε2, an increase ΔC in capacitance (due to ε2> ε1) must be produced, and the capacitance between the electrodes C=C1+. DELTA.C. If the electrode is immersed for a length of l, the capacitance increase is: ε1), the capacitance between the electrodes, C=C1+. DELTA.C, is increased by: when ε 2, ε 1, R, r are unchanged, the capacitance increment DeltaC is proportional to the electrode immersed length l, so the liquid level height can be known by measuring the capacitance increment value.

The existing capacitive liquid level sensor uses most of the electrode shell of aluminum, such as the Tippkemper capacitive liquid level sensor with the model number of CNS-606, the shell material of the existing capacitive liquid level sensor is aluminum, not only aluminum, but also stainless steel, the ceramic material used by the protective tube 1 has corrosion resistance larger than that of aluminum and stainless steel, and meanwhile, the stainless steel material has poor corrosion resistance to strong alkali and strong acid at lower temperature because of iron, and the ceramic material has the irreplaceable advantages of metal and polymer composite materials in the low-temperature collar due to the abrasion resistance, corrosion resistance, electrical insulation and the like.

The stainless steel is, for example, 304 stainless steel which is most widely used in the market, and the stainless steel can resist high temperature of eight hundred degrees, and the ceramic temperature is generally above 1000 degrees, so the effect of the ceramic material of the protection tube 1 is larger than that of other metals such as 304 stainless steel and aluminum in the market.

The material of the conductor 10 is not particularly limited, and is made of a cylindrical metal material, and when the conductor 10 is installed in the inner cavity of the protection tube 1, the conductor 10 is encapsulated by the insulating encapsulation material 4, and the material of the insulating encapsulation material 4 can be epoxy resin material, polytetrafluoroethylene, polyphenylene sulfide, modified polyoxymethylene, and the like, including but not limited to the above materials, and the material of the insulating encapsulation material 4 only needs to be water-resistant, high-temperature-resistant, corrosion-resistant and insulating.

The type of the cable 2 can be that the radio frequency wire RG-5/U coaxial cable is wrapped on the surface of the conductor 10, the RG-5/U coaxial cable is of an existing structure, the conductor is bare copper, the insulator solid low-density polyethylene shielding layer is braided with bare copper, the heat insulation cover is made of PVC materials, and the type of the cable 2 is not limited to the radio frequency wire corresponding to RG-5/U.

When the device is placed in a container, the signal processing board 3 in the detection data transmission, which is obtained by matching the protective tube 1, the conductor 10 and the cable 2, receives and transmits data to a specified device through the signal processing board 3, so that the follow-up monitoring of the liquid in the container can be ensured in real time.

As a preferred scheme of the utility model, the surface of the protection tube 1 is provided with a supporting mechanism for supporting protection, the supporting mechanism comprises a supporting seat 5 arranged at the bottom end of the protection tube 1 and a positioning seat 6 arranged at the top end of the surface of the protection tube 1, the surface of the positioning seat 6 is provided with a through hole for the protection tube 1 to pass through, the surface of the supporting seat 5 is provided with a containing groove matched with the bottom end of the protection tube 1 in an inward concave manner, and the containing groove and the inner cavity of the through hole are fixedly connected with rubber rings matched with the protection tube 1.

Before the installation, accomodate or during the show, because the shape of protection pipe 1 is smooth cylinder, when placing the department and rocking, protection pipe 1 can produce the risk that probably rolls down, and then can't guarantee the life of device when leading to the device to drop striking influence precision.

The shape of supporting seat 5 and positioning seat 6 is the square, guarantee that supporting seat 5 can directly make protection pipe 1 vertically place when installing protection pipe 1 bottom, simultaneously the shape of supporting seat 5 and positioning seat 6 is square when guaranteeing protection pipe 1 when the level is placed, make protection pipe 1 keep away from the device department through the shape of supporting seat 5 and positioning seat 6, reduce with the friction and the contact of placing the department, avoid the risk of roll off simultaneously, the diameter size of rubber circle is the same with the diameter size of protection pipe 1, but simultaneously because of rubber circle material it can produce certain elastic deformation, and then guarantee the position location to protection pipe 1 when can not hinder the installation of protection pipe 1, guarantee the stability that protection pipe 1 used.

The surface of supporting seat 5 and positioning seat 6 all has certain mutual crisscross pattern of increase frictional force, and then guarantees the stability of follow-up use, and simultaneously when dismantling or installing, it is located the top on protection tube 1 surface to need to install positioning seat 6 earlier, installs supporting seat 5 and the bottom of protection tube 1 each other after positioning seat 6 installs suitable position, accomplishes the installation fast, makes things convenient for follow-up use, then dismantle supporting seat 5 after dismantling the surface slip dismantlement of positioning seat 6 along protection tube 1 when dismantling.

As a preferred embodiment of the present utility model, a capacitor of 30pf is provided on the surface of the signal processing board 3, a measuring chip is provided on the surface of the signal processing board 3, the conductor 10 is electrically connected to the capacitor, and the capacitor is electrically connected to the measuring chip.

The surface of the signal processing board 3 is provided with a capacitor of 30pf, the capacitor is connected with the conductor 10, so that when the device is placed in the container, detected data signals are transmitted to the capacitor through the conductor 10, the data signals are transmitted to the measuring chip through the capacitor, the model of the measuring chip is CT1000, the measuring chip is linked with the capacitor, normal transmission of data is guaranteed, the signal processing board 3 can be connected with display or processing equipment through a data interface of RS232/RS485, and accordingly real-time detection of liquid level in the container can be guaranteed.

The detected signal is sent to the signal processing board 3 through the single electrode formed by the conductor 10 and the cable 2, the detected signal is processed through the measuring chip and the capacitor in the signal processing board 3, the electrostatic capacity of the electrode may exceed the capacity input capacity under the permission of CT1000, the electrodes are connected in series through the capacitor with the capacity of about 30pF, the type of the capacitor can be the DIP ceramic capacitor capacity of about 30PF, however, the specific type of the capacitor is not limited, and the capacitance of the capacitor is only required to be about 30 PF.

As a preferable scheme of the utility model, the top end of the protective tube 1 is detachably provided with a sealing cover 7, the bottom of the sealing cover 7 is fixedly connected with a thread bush 8, and the top of the inner wall surface of the protective tube 1 is provided with threads matched with the thread bush 8.

The structure of sealed lid 7 and thread bush 8 is the integrative formation of high temperature resistant water-fast corrosion resistant material, the material can be epoxy integrated formation or can be ceramic equally, the surface of thread bush 8 polishes and forms the screw thread, the through-hole that supplies conductor 10 and cable 2 to run through is seted up on the surface of sealed lid 7 and thread bush 8, guarantee can not influence conductor 10 and cable 2 and install to the inner chamber of protective tube 1, sealed lid 7 and thread bush 8 can follow the surface slip of protective tube 1, after protective tube 1 and cable 2 install, accessible slip sealed lid 7 reaches suitable position, then rotate sealed lid 7 and make the thread bush 8 and the screw thread threaded connection at protective tube 1 internal face top, sealed lid 7 gradually moves to the top direction of protective tube 1 until with the top contact of protective tube 1 in the pivoted, and then guarantee the leakproofness.

As a preferable mode of the utility model, a sealing member 9 for sealing is arranged in the inner cavity of the sealing cover 7, and the sealing member 9 is made of rubber.

When sealed lid 7 and thread bush 8 are installed to the assigned position, the diameter size of through-hole is greater than the size of conductor 10 and cable 2, and the diameter size of sealing member 9 and the size looks adaptation of through-hole, and then when guaranteeing that sealing member 9 is located the through-hole inner chamber, seal the through-hole, play the positioning action when sealing member 9 is located the through-hole inner chamber when guaranteeing the follow-up use, simultaneously the material of sealing member 9 is the rubber material, and then guarantee that sealing member 9 can produce certain elastic deformation, can not influence the effect of sealing member 9 motion to in the through-hole, guarantee sealed effect simultaneously.

As a preferable mode of the utility model, the diameter of the protective tube 1 is 20mm, the inner diameter of the protective tube 1 is 10mm, and the length of the protective tube 1 is 350mm.

The sum of the diameters of the cable 2 and the conductor 10 is 8.2mm to 8.6mm, and specific values include any value from 8.3mm, 8.4mm, 8.5mm and the like, namely from 8.2mm to 8.6mm, and simultaneously include 8.2mm and 8.6mm.

The working principle and the using flow of the utility model are as follows: by inserting the cable 2 into the inner cavity of the protective tube 1, then packaging the cable 2 by the insulating packaging material 4, moving the cable 2 to a proper position by the sliding sealing cover 7, rotating the sealing cover 7 to enable the threaded sleeve 8 to be connected with threads arranged on the inner wall surface of the protective tube 1, sealing the protective tube 1 when the sealing cover 7 moves to a proper position and the sealing element 9 is positioned in the inner cavity of the sealing cover 7, inserting the device into liquid when the detection is needed, inserting the device into the liquid when the liquid is water, forming an external electrode by the liquid and the protective tube 1 because the water is conductive liquid, inputting detected data into a capacitor on the signal processing plate 3 through the cable 2 by the capacitance increment being in proportion to the immersed length of the electrode when a part of the protective tube 1 is immersed by the liquid, the measuring chip is input to the signal processing board 3 through the capacitor, the detected data is analyzed and transmitted through the measuring chip, then the data can be transmitted to the appointed device through the external transmission line of the signal processing board 3, the effect of single electrode on the real-time liquid level detection is achieved, when the measuring chip is not needed to be used, under the condition of storage or display, the positioning seat 6 slides to the top end of the protection tube 1, then the bottom end of the protection tube 1 is inserted into the inner cavity of the supporting seat 5, the position of the protection tube 1 is positioned through the friction force increased by the rubber ring in the inner cavity of the measuring chip, the protection tube 1 is prevented from sliding, and meanwhile, the risk of sliding is avoided because the supporting seat 5 and the positioning seat 6 are square

In summary, the utility model has the following beneficial effects: when needing to detect, insert the device into liquid, liquid and protection tube 1 form the outer electrode, when the partly of protection tube 1 is immersed by liquid, the electric capacity increment is in direct proportion with electrode submergence length, pass through the conductor 10 with the data of detecting and input the condenser on the signal processing board 3 through cable 2, pass through the measuring chip on the signal processing board 3 through the condenser input, carry out analysis and transmission to the data of detecting through measuring chip, reach the effect that the single electrode detected the liquid level in real time, the material of protection tube 1 is ceramic simultaneously, the insulating nature of ceramic material being greater than metal casing is guaranteeing, its high temperature and corrosion-resistant about 1000, guarantee life.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present utility model is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The utility model provides a durable type liquid level sensor is with detecting electrode, includes that the top is open protection pipe (1) and signal processing board (3), its characterized in that: the cable comprises a conductor (10) arranged in an inner cavity of a protective tube (1), one end of the conductor (10) is positioned in the inner cavity of the protective tube (1), a cable (2) arranged on the surface of the conductor (10), a signal processing plate (3) is arranged at the other end of the conductor (10), and an insulating packaging material (4) used for packaging the cable (2) is arranged at the bottom end of the inner cavity of the protective tube (1).

2. A durable sensing electrode for a fluid level sensor as defined in claim 1, wherein: the surface of protection pipe (1) is equipped with the supporting mechanism who is used for supporting the protection, supporting mechanism is including locating supporting seat (5) of protection pipe (1) bottom with locate positioning seat (6) on protection pipe (1) surface top, the confession has been seted up on the surface of positioning seat (6) the through-hole that protection pipe (1) link up, the surface of supporting seat (5) inwards concavely seted up with the holding tank of protection pipe (1) bottom looks adaptation, the holding tank with the equal fixedly connected with of inner chamber of through-hole with the rubber circle of protection pipe (1) looks adaptation.

3. A durable sensing electrode for a fluid level sensor as defined in claim 1, wherein: the surface of the signal processing board (3) is provided with a capacitor of 30pf, the surface of the signal processing board (3) is provided with a measuring chip, the conductor (10) is electrically connected with the capacitor, and the capacitor is electrically connected with the measuring chip.

4. A durable sensing electrode for a fluid level sensor as defined in claim 1, wherein: the top of protection tube (1) detachably is provided with sealed lid (7), the bottom fixedly connected with thread bush (8) of sealed lid (7), the top of protection tube (1) internal face be provided with thread bush (8) looks adaptation.

5. A durable sensing electrode for a fluid level sensor as defined in claim 4, wherein: the inner cavity of the sealing cover (7) is provided with a sealing piece (9) for sealing, and the sealing piece (9) is made of rubber.

6. A durable sensing electrode for a fluid level sensor as defined in claim 1, wherein: the diameter size of the protection pipe (1) is 20mm, the inner diameter size of the protection pipe (1) is 10mm, and the length of the protection pipe (1) is 350mm.