CN112857534B

CN112857534B - Magnetostrictive liquid level meter and flexible probe rod

Info

Publication number: CN112857534B
Application number: CN202110083959.6A
Authority: CN
Inventors: 张祖文
Original assignee: Beijing Swisa Instrument Co ltd
Current assignee: Beijing Swisa Instrument Co ltd
Priority date: 2021-01-21
Filing date: 2021-01-21
Publication date: 2022-04-01
Anticipated expiration: 2041-01-21
Also published as: CN112857534A

Abstract

The application discloses magnetostrictive liquid level meter and flexible probe rod, wherein, magnetostrictive liquid level meter's flexible probe rod, including outer tube assembly and interior sleeve assembly, the outer tube assembly includes the hyexitube, the both ends of hyexitube are fixed respectively and are provided with the transition piece and are connected with other parts, interior sleeve assembly is including the flexible insulating tube that is used for setting up the waveguide silk, flexible insulating tube cover is established the inside of hyexitube, flexible insulating tube is polymer insulating material. According to the flexible probe rod of the magnetostrictive liquid level meter, the flexible pipe is used as the outer pipe, the inner pipe is made of the polymer insulating material, so that the magnetostrictive liquid level meter has certain flexibility, and meanwhile, the flexible pipe used as the outer pipe can prevent liquid from entering the liquid level meter and being prevented from leaking; the application provides a magnetostrictive liquid level meter can satisfy a wide range and measure, and is easy to assemble and transportation, simple structure, and the measurement is stable and measure accurately.

Description

Magnetostrictive liquid level meter and flexible probe rod

Technical Field

The present application relates generally to the technical field of liquid level meters, and in particular, to a magnetostrictive liquid level meter and a flexible probe rod.

Background

In the field of industrial automation, a magnetostrictive liquid level meter is a common product for liquid level measurement, has the advantages of high precision and low maintenance, can be communicated with most digital control systems, well solves the problem of accurate measurement of liquid level and interfaces under extremely bad working conditions, well avoids the defects of other liquid level products such as a traditional electric buoy, a differential pressure transmitter, a radar and the like in field application due to the fact that the magnetostrictive technology is adopted to determine that the measurement process is not influenced by the change of factors such as temperature, pressure, dielectric constant and the like, and has the characteristics of high precision, high stability, maintenance-free and the like, so that the magnetostrictive liquid level meter is widely applied to the high-precision measurement of various liquid levels and interfaces.

When the equivalent distance exceeds 6 meters, the measurement can be regarded as a large-distance measurement, and a flexible probe rod is generally needed to solve the problems of transportation and installation. However, the flexible probe rod often has leakage problems due to complex structure, including leakage of external rainwater and the like into the probe rod, leakage of process media to an outer sheath or even an inner core, and once leakage occurs, the measurement accuracy of the instrument is affected, and the whole instrument is scrapped when the leakage is serious; in addition, the method has the defects of weak far-end signals, unstable measurement and inaccuracy.

Disclosure of Invention

In view of the above-mentioned defects or shortcomings in the prior art, it is desirable to provide a magnetostrictive liquid level meter and a flexible probe rod, which can realize a large-range measurement, and have the advantages of delicate structure, reliable sealing and stable signal transmission.

On the one hand, this application provides a flexible probe rod of magnetostrictive liquid level meter, including outer tube assembly and interior sleeve assembly, the outer tube assembly includes the flexible pipe, the both ends of flexible pipe are fixed respectively and are provided with the transition piece and are connected with other parts, interior sleeve assembly is including the flexible insulating tube that is used for setting up the waveguide silk, flexible insulating tube cover is established the inside of flexible pipe.

Furthermore, an inner sleeve joint is fixedly arranged at the upper end of the flexible insulating pipe, a first transition piece is arranged at the upper end of the flexible insulating pipe, and the inner sleeve joint is fixedly matched with the first transition piece to complete the fixed connection of the outer sleeve assembly and the inner sleeve assembly.

Further, the first transition piece comprises a straight pipe section sleeved outside the flexible pipe, and the straight pipe section is welded with the upper end face of the flexible pipe.

Furthermore, a second transition piece is fixedly arranged at the lower end of the flexible pipe and is fixedly connected with the counterweight device.

Preferably, the flexible pipe comprises a corrugated pipe and a stainless steel braided hose arranged outside the corrugated pipe, and the flexible insulating pipe is a polytetrafluoroethylene pipe.

Further, the inside of flexible insulating tube is provided with overspeed device tensioner, overspeed device tensioner passes through the fixed setting of tensioning seat and is in the lower extreme of flexible insulating tube.

Furthermore, the tensioning seat comprises a front section, a middle section and a rear section, the outer diameter of the front section is in clearance fit with the inner diameter of the flexible insulating pipe, the middle section is a threaded section, the threaded section is in interference fit with the interior of the flexible insulating pipe, and a guide head is fixedly arranged on the rear section; the tensioning seat is internally and fixedly provided with a spring pull rod, and the tensioning device comprises the spring pull rod and a spring matched with the spring pull rod.

On the other hand, this application provides a magnetostrictive liquid level meter, include as above arbitrary the flexible probe rod of magnetostrictive liquid level meter, still including setting up the inside inner core assembly of flexible probe rod and cover are established float subassembly on the flexible probe rod.

Furthermore, the inner core assembly comprises a waveguide wire, a signal wire and a balance wire which are arranged in the flexible insulating pipe, and the tail ends of the waveguide wire, the signal wire and the balance wire are fixedly connected with the tensioning device through a PCB.

Furthermore, a plurality of supporting structures are fixedly arranged in the flexible insulating pipe, each supporting structure comprises a supporting sleeve and an O-shaped ring sleeved between the supporting sleeve and the flexible insulating pipe, a central hole used for penetrating the waveguide wire is formed in each supporting structure, and a first axial hole and a second axial hole which are located on two sides of the central hole and used for penetrating the signal wire and the balance wire respectively.

The technical scheme provided by the embodiment of the application can have the following beneficial effects:

according to the flexible probe rod of the magnetostrictive liquid level meter, the flexible pipe is used as the outer pipe, the inner pipe is made of the polymer insulating material, so that the magnetostrictive liquid level meter has certain flexibility, and meanwhile, the flexible pipe used as the outer pipe can prevent liquid from entering the liquid level meter and being prevented from leaking; the application provides a magnetostrictive liquid level meter can satisfy a wide range and measure, and is easy to assemble and transportation, simple structure, and the measurement is stable and measure accurately.

Drawings

Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:

FIG. 1 is a schematic structural diagram of a flexible probe of a magnetostrictive liquid level gauge according to an embodiment of the present application;

FIG. 2 is a schematic structural view of an outer sleeve assembly provided in accordance with an embodiment of the present application;

FIG. 3 is a schematic structural view of an inner sleeve assembly provided in an embodiment of the present application;

FIG. 4 is a schematic view of the connection of the inner and outer sleeve assemblies at the location of the inner sleeve joint as provided by an embodiment of the present application;

fig. 5 is a schematic structural diagram of a tension seat provided in an embodiment of the present application;

fig. 6 is a schematic structural diagram of a tensioning device provided in an embodiment of the present application.

Wherein the content of the first and second substances,

100. an outer sleeve assembly; 200. an inner sleeve assembly; 300. an inner sleeve joint; 400. a first transition piece; 500. a second transition piece; 600. a tensioning device; 700. an inner core assembly; 800. a support structure; 900. a ferrule assembly;

1. a flexible tube; 2. a flexible insulating tube; 3. a tensioning seat; 4. a spring pull rod; 5. a spring; 6. a waveguide wire; 7. a signal line; 8. a balance line; 9. a PCB board; 10. a support sleeve; 11. an O-shaped ring; 12. a straight pipe section; 13. a transition joint; 14. a connecting member; 15. a sleeve; 16. a fixed seat; 17. a piezoelectric sensor assembly; 18. a copper bush component; 19. a sensor seat; 20. a circuit board; 21. a guide head;

Detailed Description

The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

Please refer to fig. 1-3 in detail, on one hand, the present application provides a flexible probe rod of a magnetostrictive liquid level meter, which includes an outer sleeve 15 assembly 100 and an inner sleeve 15 assembly 200, where the outer sleeve 15 assembly 100 includes a flexible tube 1, two ends of the flexible tube 1 are respectively and fixedly provided with a transition piece to be connected with other components, the inner sleeve 15 assembly 200 includes a flexible insulating tube 2 for arranging a waveguide wire 6, the flexible insulating tube 2 is sleeved inside the flexible tube 1, the flexible tube 1 is a stainless steel wire braided hose, and the flexible insulating tube 2 is a polymer insulating material.

Preferably, the flexible pipe 1 comprises a corrugated pipe and a stainless steel braided hose arranged outside the corrugated pipe, and the flexible insulating pipe 2 is a polytetrafluoroethylene pipe.

The corrugated pipe has elasticity and can generate displacement under the action of pressure, axial force, transverse force or bending moment. The bellows may also serve as a sealing and isolating element to separate the two media or to prevent harmful fluids from entering the measurement portion of the device. The corrugated pipe can be divided into a metal corrugated pipe and a nonmetal corrugated pipe according to the forming materials; it can be divided into single layer and multilayer according to structure.

The stainless steel braided hose is a product formed after a layer of stainless steel is braided outside the corrugated pipe, the flexible pipe 1 designed by the method can play a flexible role, the problems of transportation and installation are solved, and the flexible pipe has certain rigidity, so that the measurement of the magnetostrictive liquid level meter is conveniently realized, and the liquid can be prevented from leaking into the probe rod.

Polytetrafluoroethylene (Polytetrafluoroethylene), abbreviated as Teflon, PTFE, F4, and the like, also called Teflon, has good insulation, is not affected by environment and frequency, has a volume resistance of 1018 ohm cm, low dielectric loss, and high breakdown voltage. The high-temperature-resistant and low-temperature-resistant composite material has good high-temperature resistance and low temperature influence, has a wide temperature range, and can be used at a temperature of-190-260 ℃.

It should be noted that, it is only a preferred embodiment to use teflon as the flexible insulating tube 2, and in the specific implementation, it is also possible to use another insulating polymer material as the flexible insulating tube 2, and similarly, it is only a preferred embodiment to use a corrugated tube as the flexible tube 1, and in the specific implementation, it is also possible to use another flexible material as the flexible tube 1, and its outer layer is provided with a stainless steel mesh. The flexible probe rod made of other materials and adopting the concept of the application belongs to the invention concept of the application and is included in the scope of the application.

An inner sleeve 15 connector 300 is fixedly arranged at the upper end of the flexible insulating pipe 2, a first transition piece 400 is arranged at the upper end of the flexible pipe 1, and the inner sleeve 15 connector 300 and the first transition piece 400 are fixedly matched to complete the fixed connection of the outer sleeve 15 assembly 100 and the inner sleeve 15 assembly 200.

The first transition piece 400 comprises a straight pipe section 12 sleeved outside the flexible pipe 1, a steel wire braided hose is sleeved in the straight pipe section 12 in the whole process, the straight pipe section 12 and the steel wire braided hose are continuously welded at the end, the first transition piece 400 further comprises a clamping sleeve assembly 900 sleeved on the straight pipe section 12, and the outer diameter of the straight pipe section 12 is in sliding fit with the clamping sleeve assembly 900 and can be locked, so that sealing and fixing are guaranteed.

As shown in fig. 4, the inner sleeve 15 joint 300 includes a connecting member 14, a sleeve 15, and a fixing seat 16, which are sequentially arranged from top to bottom, wherein the connecting member 14, the sleeve 15, and the fixing seat 16 are welded together, and a continuous weld ensures sealing, the end of the connecting member 14 has a thread to connect an electronic gauge head, a central hole for installing an inner core assembly 700, and has a pin hole in a radial direction to install a pin to prevent the inner core from rotating, the inner hole of the sleeve 15 is divided into two sections, the lower section is a unthreaded hole, and is in clearance fit with the outer diameter of the flexible insulating tube 2, the upper section of the sleeve 15 is a screw hole, and is connected with the flexible insulating tube 2, and the thread is coated with a sealant to ensure sealing.

Further, a second transition piece 500 is fixedly arranged at the lower end of the flexible pipe 1, and the second transition piece 500 is fixedly connected with a counterweight device. The second transition piece 500 comprises a transition joint 13 sleeved on the flexible pipe 1, wherein the transition joint 13 is fixedly connected with the flexible pipe 1 at the lower end of the flexible pipe 1.

When the balance weight is specifically set, the transition joint 13 is sleeved with the other end of the steel wire woven stainless steel hose in the whole process and is continuously welded on the end face, sealing and reliable connection are guaranteed, one end of the balance weight screw is welded with the transition joint 13, the other end of the balance weight screw is provided with a thread and a radial pin hole, the weight of the balance weight block is determined according to the length of the flexible probe rod, an inner hole of the balance weight block is in clearance fit with the balance weight screw, the balance weight block is sleeved on the balance weight screw, a nut is screwed on the end part of the balance weight screw, the balance weight is prevented from falling off, a split pin penetrates through the radial pin hole of the balance weight screw, and the tail part of the split pin is bent off, so that the nut is prevented from falling off.

Further, the interior of the flexible insulating tube 2 is provided with a tensioning device 600, and the tensioning device 600 is fixedly arranged at the lower end of the flexible insulating tube 2 through a tensioning seat 3.

In the specific setting, as shown in fig. 5 and 6, the tensioning seat 3 includes a front section, a middle section and a rear section, the outer diameter of the front section is in clearance fit with the inner diameter of the flexible insulating tube 2, the middle section is a threaded section, the threaded section is in interference fit with the interior of the flexible insulating tube 2, and a guide head 21 is fixedly arranged on the rear section; tensioning seat 3 is inside to be fixed and is provided with spring pull rod 4, overspeed device tensioner 600 include spring pull rod 4 and with spring pull rod 4 complex spring 5.

The front end of the tensioning seat 3 is a guide section which consists of a chamfer and a cylindrical section in clearance fit with the inner diameter of the flexible insulating pipe 2; the interruption is a thread section, and the thread sealing glue is matched and screwed into the Teflon pipe; the rear section is a connecting thread end and is provided with a thread seal for installing the guide head 21, the outer diameter of the guide head 21 is consistent with that of the flexible insulating tube 2, and the front end is hemispherical to play a role in guiding.

On the other hand, the application provides a magnetostrictive liquid level meter, include as above arbitrary the magnetostrictive liquid level meter's flexible probe rod, still including setting up the inside inner core assembly 700 of flexible probe rod and cover are established float subassembly on the flexible probe rod.

The inner core assembly 700 comprises a waveguide wire 6, a signal wire 7 and a balance wire 8 which are arranged inside the flexible insulating tube 2, and the tail ends of the waveguide wire 6, the signal wire 7 and the balance wire 8 are fixedly connected with the tensioning device 600 through a PCB 9.

The inner core assembly 700 further comprises a circuit board 20, a copper sleeve component 18, a piezoelectric sensor component 17 and a sensor seat 19, the sensor seat 19 is inserted into the connecting piece 14 of the connector 300 of the inner sleeve 15 and is limited to rotate through a pin, the outer end of the sensor seat 19 supports and fixes the piezoelectric sensor through the copper sleeve component 18, the piezoelectric sensor is connected with an electronic meter through a signal wire 7 and a plum blossom circuit board 20, a waveguide wire 6 penetrates through a center hole of the piezoelectric sensor and is welded with the piezoelectric sensor to transmit torsion waves, and the signal wire 7 and a balance wire 8 are fixed in an opening seam of an excircle at the front end of the sensor seat 19.

In addition, a plurality of supporting structures 800 are fixedly arranged inside the flexible insulating pipe 2, each supporting structure 800 comprises a supporting sleeve 10 and an O-ring 11 sleeved between the supporting sleeve 10 and the flexible insulating pipe 2, a central hole for passing through the waveguide wire 6, and a first axial hole and a second axial hole which are positioned on two sides of the central hole and are respectively used for passing through the signal wire 7 and the balance wire 8 are arranged on the supporting structures 800.

The inner hole of the supporting sleeve 10 is in a shape with two large ends and a small middle part so as to reduce the possibility of contact with the waveguide wire 6 to the maximum extent and reduce signal attenuation, longitudinal grooves are symmetrically formed in the outer circle of the supporting sleeve 10, a signal wire 7 is placed in one groove, a balance wire 8 is placed in the other groove, then the signal wire 7, the balance wire 8 and the supporting sleeve 10 are sleeved by the elasticity of an O-shaped ring 11, and in order to prevent the O-shaped ring 11 from falling off, an annular groove is formed in the longitudinal middle position of the outer circle of the supporting sleeve 10, and the O-shaped ring 11 just falls into the annular groove.

The application provides a magnetostrictive liquid level meter, when specifically installing, include:

(1) installation of the outer sleeve 15 assembly 100: cutting the steel wire woven stainless steel hose as a flexible pipe 1 according to the designed length, respectively sleeving the straight pipe section 12 and the transition joint 13 into two ends of the steel wire woven stainless steel hose, then welding a balance weight screw on the transition joint 13, and performing helium mass spectrometer leak detection test after all welding is completed.

It is to be noted that the transition joint 13 is formed by welding the straight tube sections 12 to the flexible tube 1, respectively, and by continuously welding them at the end faces of the connecting parts. When welding, it is necessary to weld the bellows part inside the wire-braided stainless steel hose instead of the braided mesh outside.

(2) Installation of inner sleeve 15 assembly 200: machining a connecting piece 14, a sleeve 15 and a fixed seat 16 which are used as the pipe joint of the inner pipe according to a drawing, and then welding the connecting piece, the sleeve 15 and the fixed seat together; the Teflon pipe serving as the flexible insulating pipe 2 is cut according to the designed length, thread sealing glue is coated on the internal thread of the sleeve 15, and the Teflon pipe is screwed into the internal thread of the sleeve 15 through rotation and axial extrusion.

It should be noted that the depth to be screwed is measured in advance and marked to ensure that the teflon tube is completely combined with the internal thread of the sleeve 15, the inner diameter of the designed internal thread of the sleeve 15 is slightly smaller than the outer diameter of the teflon tube, so that under the external force rotation and the axial extrusion, the teflon tube is slightly deformed to be screwed into the internal thread of the sleeve 15 like a self-tapping screw, and after the thread sealant is cured, the teflon tube and the sleeve 15 are firmly combined together and the good sealing is ensured.

(3) Connection of waveguide wire 6: the method comprises the steps of intercepting a waveguide wire 6, a signal wire 7 and a balance wire 8 with designed lengths, welding the waveguide wire 6, the signal wire 7 and the balance wire 8 on a PCB 9, sequentially penetrating designed number of O-shaped rings 11 and supporting sleeves 10 from the other end, penetrating the waveguide wire 6 out of a central hole of the supporting sleeve 10 after determining a spacing distance, respectively placing the signal wire 7 and the balance wire 8 in two symmetrical longitudinal grooves of the supporting sleeve 10 and fixing the two longitudinal grooves by the O-shaped rings 11.

(4) Tensioning of waveguide wire 6: one end of the PCB 9 penetrates into the inner sleeve 15 assembly 200 from the connecting piece 14 and is pulled out of the flexible insulating tube 2 from the other end, the tensioning spring 5 is hung on the PCB 9, and the spring pull rod 4 penetrates out of one end of the tensioning seat 3 and then the tensioning spring 5 is hung on the spring pull rod 4.

The waveguide wire 6, the signal wire 7 and the balance wire 8 are integrally pulled to move in the flexible insulating tube 2, after the front end cylindrical guide section of the tensioning seat 3 enters the flexible insulating tube 2, thread sealing glue is coated on the threads of the tensioning seat 3, and then the tensioning seat 3 is extruded by a tool in a rotating and axial direction to enter the flexible insulating tube 2.

When screwing the tensioning seat 3 into the flexible insulating pipe 2, the tool withdrawal groove is screwed to expose half of the tool withdrawal groove, so that the flexible insulating pipe 2 slightly deforms under the external force rotation and the axial extrusion, the tensioning seat 3 is screwed into the flexible insulating pipe 2 like a self-tapping screw, and after the thread sealant is cured, the flexible insulating pipe 2 and the tensioning seat 3 are firmly combined together and good sealing is ensured.

It should be noted that, during the rotation and screwing process, it is necessary to ensure that the waveguide wire 6, the signal wire 7 and the balance wire 8 do not twist, and a tool is used to limit the rotation of the end of the spring pull rod 4 when necessary.

And then coating thread sealing glue on the tail threads of the tensioning seat 3, screwing the guide head 21, and finishing the assembly of the end.

(5) Assembling the inner core: and (3) arranging a positioning pin into a radial pin hole on the connecting piece 14 at the upper end of the flexible insulating tube 2, arranging the sensor seat 19 into the inner hole of the connecting piece 14, limiting rotation through the positioning pin, simultaneously leading out the signal wire 7 and the balance wire 8 in a groove at the end of the sensor seat 19, and clamping and fixing after balanced tensioning.

The copper sheathing assembly 18 is installed in the sensor base 19, the waveguide wire 6 is inserted into the central hole of the piezoelectric sensor assembly 17, then the piezoelectric sensor assembly 17 is fixed on the copper sheathing assembly 18, and at the moment, the waveguide wire 6 is pulled to be exposed out of the piezoelectric sensor assembly 17 by the designed and specified length, so that the tension spring at the lower end of the flexible insulating tube 2 reaches the designed and specified tension force.

Then the waveguide wire 6 is welded with the piezoelectric sensor assembly 17, and then the signal wire 7 plum blossom circuit board 20 is welded with the piezoelectric sensor assembly 17, so that the end assembly is completed.

(6) Fixed connection of the outer sleeve 15 assembly 100 and the inner sleeve 15 assembly 200: one end of the ferrule holder of one ferrule assembly 900 penetrates into the straight pipe section 12 from one end of the straight pipe section 12, and then the ferrule holder of the other ferrule assembly 900 penetrates into the straight pipe section 12(11) from the other end of the straight pipe section 12 in the opposite direction.

One end of a guide head 21 on the inner core assembly 700 penetrates into the straight pipe section 12 and the flexible insulating pipe 2 until the end surface of the straight pipe section 12 is in contact with the end surface of the inner hole of the fixed seat 16 and is axially positioned, at the moment, the clamping sleeve seat at the upper end is screwed into the fixed seat 16, and then the locking nut is locked, so that the inner sleeve 15 assembly 200 and the outer sheath assembly are connected and fastened.

(7) Installing a floater component: the floater component is arranged in the outer sheath assembly according to the indication direction, the balancing weight is sleeved on the counterweight screw rod, the nut is screwed on the end part of the counterweight screw rod to prevent the counterweight from falling off, and then the split pin is penetrated in the radial pin hole of the counterweight screw rod, the tail part of the split pin is bent off to prevent the nut from falling off, so that the assembly of the whole flexible probe rod is completed.

When the sensor of the magnetostrictive liquid level meter works, a circuit part of the sensor excites pulse current on the waveguide wire 6, and when the current propagates along the waveguide wire 6, a pulse current magnetic field is generated around the waveguide wire 6; a floater outside a probe rod of the magnetostrictive liquid level meter can move up and down along the probe rod along with the change of the liquid level; a group of permanent magnetic rings are arranged inside the floater; when the pulsed current magnetic field meets the magnetic loop magnetic field generated by the float, the magnetic field around the float changes so that the waveguide wire 6 made of magnetostrictive material generates a torsional wave pulse at the position where the float is located, and the pulse is transmitted back along the waveguide wire 6 at a fixed speed and detected by the piezoelectric sensor assembly 17. The position of the float, i.e. the position of the liquid level, can be accurately determined by measuring the time difference between the pulse current and the torsional wave.

It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings that is solely for the purpose of facilitating the description and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and is therefore not to be construed as limiting the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

Unless defined otherwise, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Terms such as "disposed" and the like, as used herein, may refer to one element being directly attached to another element or one element being attached to another element through intervening elements. Features described herein in one embodiment may be applied to another embodiment, either alone or in combination with other features, unless the feature is otherwise inapplicable or otherwise stated in the other embodiment.

The present invention has been described in terms of the above embodiments, but it should be understood that the above embodiments are for purposes of illustration and description only and are not intended to limit the invention to the scope of the described embodiments. It will be appreciated by those skilled in the art that many variations and modifications may be made to the teachings of the invention, which fall within the scope of the invention as claimed.

Claims

1. The flexible probe rod of the magnetostrictive liquid level meter is characterized by comprising an outer sleeve assembly and an inner sleeve assembly, wherein the outer sleeve assembly comprises a flexible pipe, the flexible pipe comprises a corrugated pipe and a stainless steel woven hose arranged outside the corrugated pipe, transition pieces are fixedly arranged at two ends of the flexible pipe respectively and connected with other parts, the inner sleeve assembly comprises a flexible insulating pipe used for arranging waveguide wires, the flexible insulating pipe is a polytetrafluoroethylene pipe, and the flexible insulating pipe is sleeved inside the flexible pipe; an inner sleeve joint is fixedly arranged at the upper end of the flexible insulating pipe, a first transition piece is arranged at the upper end of the flexible insulating pipe, and the inner sleeve joint is fixedly matched with the first transition piece to complete the fixed connection of the outer sleeve assembly and the inner sleeve assembly; the first transition piece comprises a straight pipe section sleeved outside the flexible pipe, and the straight pipe section is welded with the upper end face of the flexible pipe; the lower end of the flexible pipe is fixedly provided with a second transition piece, and the second transition piece is fixedly connected with the counterweight device.

2. The flexible probe of claim 1, wherein a tensioning device is disposed inside the flexible insulating tube, and the tensioning device is fixedly disposed at a lower end of the flexible insulating tube by a tensioning seat.

3. The flexible probe rod of a magnetostrictive liquid level meter according to claim 2, wherein the tensioning seat comprises a front section, a middle section and a rear section, the outer diameter of the front section is in clearance fit with the inner diameter of the flexible insulating pipe, the middle section is a threaded section, the threaded section is in interference fit with the inside of the flexible insulating pipe, and a guide head is fixedly arranged on the rear section; the tensioning seat is internally and fixedly provided with a spring pull rod, and the tensioning device comprises the spring pull rod and a spring matched with the spring pull rod.

4. A magnetostrictive liquid level gauge, comprising the flexible probe of any one of claims 1-3, and further comprising an inner core assembly disposed inside the flexible probe and a float assembly disposed on the flexible probe.

5. The magnetostrictive liquid level gauge according to claim 4, wherein the inner core assembly comprises a waveguide wire, a signal wire and a balance wire which are arranged inside the flexible insulating pipe, and the tail ends of the waveguide wire, the signal wire and the balance wire are fixedly connected with the tensioning device through a PCB (printed circuit board).

6. The magnetostrictive liquid level gauge according to claim 5, wherein a plurality of supporting structures are fixedly arranged inside the flexible insulating pipe, each supporting structure comprises a supporting sleeve and an O-ring sleeved between the supporting sleeve and the flexible insulating pipe, and the supporting structure is provided with a central hole for passing through the waveguide wire, and a first axial hole and a second axial hole which are arranged on two sides of the central hole and are respectively used for passing through the signal line and the balance line.