Probe rod and radio frequency admittance level meter

Abstract

The utility model discloses a feeler lever and radio frequency admittance level meter wherein the feeler lever comprises a central electrode, an insulating sleeve, a protective tube and a connecting piece, the connecting piece is used for installing an electronic bin, the connecting piece is fixedly installed with one end of the protective tube, and the other end of the protective tube is connected with the insulating sleeve. One end of the central electrode is arranged in the connecting piece and connected with the circuit assembly, the other end of the central electrode penetrates through the connecting piece and extends into the protection tube, part of the insulation sleeve is located in the protection tube and arranged on the central electrode in a sleeving mode, and a gap is formed between the protection tube and the insulation sleeve. According to the probe rod and the radio frequency admittance level meter, the protection tube is arranged on the outer side of the central electrode and the outer side of the insulation sleeve, leakage of energy generated in the probe rod and the radio frequency admittance level meter can be isolated, and the anti-explosion performance of the whole structure is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of radio admittance, specifically about a probe rod and radio admittance material level meter. BACKGROUND

[0002] The radio admittance material level meter belongs to the instrument sensor industry, and is developed from the capacitive material level measurement technology, is more reliable, more accurate, and has wider applicability, and plays a very important role in industrial process monitoring. The admittance in the radio admittance is the reciprocal of impedance in electricity, which is composed of resistive component, capacitive component and inductive component. And radio frequency is to transmit high frequency radio waves, so the radio admittance material level control technology is to measure the admittance of the measured medium by high frequency radio waves to realize material level measurement.

[0003] The existing radio admittance material level meter generally cannot realize the explosion-proof of the product itself, especially the probe rod part that needs to be directly contacted with the medium. When the medium is flammable and explosive, the radio admittance material level meter without explosion-proof function is easy to cause danger.

[0004] The information disclosed in the background section of this document is only intended to increase the understanding of the overall background of the present utility model, and should not be regarded as acknowledging or implying in any form that the information constitutes prior art known to those skilled in the art. CONTENT OF THE UTILITY MODEL

[0005] The utility model aims at providing a probe rod and radio admittance material level meter, which has good explosion-proof function.

[0006] In order to achieve the above purpose, the technical scheme provided by the utility model in one embodiment is as follows:

[0007] A probe rod is used for a radio admittance material level meter, the radio admittance material level meter comprises an electronic bin, a circuit assembly is arranged in the electronic bin, the probe rod comprises a central electrode, an insulating sleeve, a protection tube and a connecting piece, the connecting piece is used for mounting the electronic bin, the connecting piece is fixedly installed with one end of the protection tube, one end of the central electrode is arranged in the interior of the connecting piece and connected with the circuit assembly, the other end of the central electrode extends to the interior of the protection tube through the connecting piece, part of the insulating sleeve is located in the protection tube and is sleeved on the central electrode, and a gap is arranged between the protection tube and the insulating sleeve.

[0008] In one or more embodiments of the utility model, the probe rod further comprises a buckle for fixing the insulating sleeve.

[0009] In one or more embodiments of the utility model, the buckle is installed at the end of the protection tube away from the connecting piece.

[0010] In one or more embodiments of the utility model, the buckle is provided with a drainage hole.

[0011] In one or more embodiments of the utility model, the protection tube is provided with a first through hole for draining liquid and / or a second through hole for exhausting air.

[0012] In one or more embodiments of the utility model, the center electrode comprises an electrode main body and a plug-in seat, the plug-in seat is arranged in the inside of the connecting piece, one end of the plug-in seat is connected with the circuit assembly, the other end is fixedly installed with one end of the electrode main body, the other end of the electrode main body extends to the inside of the protection tube through the connecting piece, the insulating sleeve is sleeved on the electrode main body and extends to the plug-in seat and the connecting piece to insulate and isolate the plug-in seat and the connecting piece.

[0013] In one or more embodiments of the utility model, the plug-in seat is formed with a fixing part extending in the radial direction, the insulating sleeve extends to the first end face of the fixing part and the inner wall of the connecting piece and abuts against the first end face of the fixing part and the inner wall of the connecting piece.

[0014] In one or more embodiments of the utility model, the probe rod further comprises a pressing piece and an insulating gasket, the insulating gasket is sleeved on the plug-in seat and one end abuts against the second end face of the fixing part, the pressing piece is arranged between the connecting piece and the plug-in seat and is fixedly installed with the connecting piece, the pressing piece abuts against the other end of the insulating gasket.

[0015] In one or more embodiments of the utility model, the probe rod further comprises an insulating shaft sleeve arranged between the pressing piece and the plug-in seat, and the insulating shaft sleeve is used for insulating and isolating the pressing piece and the plug-in seat.

[0016] The utility model discloses a kind of radio frequency admittance level meters, including electronic warehouse and above-mentioned probe rod, the electronic warehouse is fixedly installed with the connecting piece, and circuit assembly connected with the center electrode is arranged in the electronic warehouse.

[0017] Compared with prior art, the probe rod and the radio frequency admittance level meter of the utility model can isolate the leakage of internal generated energy by arranging the protection tube outside the center electrode and the insulating sleeve, improve the explosion-proof performance of the overall structure. By opening through hole, drainage hole, the normal fluidity of medium between the protection tube and the insulating sleeve is met. The setting of buckle can make the probe rod whole stable, prevent the liquid level display deviation caused by too large liquid level swing, ensure that the circuit can work normally while shock absorption protection. The mounting structure in the connecting piece reduces unnecessary welding or threaded connection, ensures that the level meter has higher voltage strength. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0019] Figure 1 It is a whole structure sectional view of the radio frequency admittance material level meter in an embodiment of the present application.

[0020] Figure 2 It is a partial sectional view of the probe rod in an embodiment of the present application.

[0021] Figure 3 It is another partial sectional view of the probe rod in an embodiment of the present application.

[0022] Figure 4 It is a bottom structure view of the probe rod in an embodiment of the present application. DETAILED DESCRIPTION

[0023] In order to make the person skilled in the art better understand the technical solutions in the present application, the following will combine the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by the person skilled in the art without creative labor should belong to the protection scope of the present application.

[0024] In the specification, "coupling" or "connecting" or "connected" includes both direct connection and indirect connection. Indirect connection is the connection through an intermediate medium, such as the connection through an electrically conductive medium, which can have a parasitic inductance or a parasitic capacitance; indirect connection can also include the connection through other active devices or passive devices on the basis of achieving the same or similar functional purposes, such as the connection through circuits or components such as switches, follower circuits, etc. In addition, in the specification, words such as "first", "second", etc. are mainly used to distinguish one technical feature from another technical feature, and do not necessarily require or imply a certain actual relationship, quantity or order between the technical features.

[0025] In the detailed description of the application, reference is made to the accompanying drawings, which form a part thereof, in which like numerals refer to like parts throughout the several views and in which an exemplary embodiment is shown by way of example. It is to be understood that other embodiments can be utilized and structural or logical changes can be made without departing from the scope of the present disclosure. Therefore, the following detailed description is not to be taken in a limiting sense.

[0026] Various operations can be described as multiple discrete actions or operations in a manner that is most helpful in understanding the claimed subject matter. However, the order of description should not be construed as to imply that these operations are necessarily order dependent. In particular, these operations can not be performed in the order of presentation. Operations described can be performed in a different order than the described embodiment. Various additional operations can be performed and / or described operations can be omitted in additional embodiments.

[0027] For purposes of the present disclosure, the phrase "A and / or B" means (A), (B), or (A and B). For purposes of the present disclosure, the phrase "A, B, and / or C" means (A), (B), (C), (A and B), (A and C), (B and C), or (A, B and C).

[0028] Various components, devices, etc. can be referred to herein in singular form, or in plural form, but this is merely for convenience and brevity, and should not be construed as limiting the number of components, devices, etc. that can be used in accordance with the teachings herein.

[0029] The specification describes using the phrases "in one embodiment" or "in other embodiments" or "in some embodiments", which can each refer to one or more of the same or different embodiments. Furthermore, the terms "comprising", "including", "having" and the like, as used with respect to embodiments of the present disclosure, are synonymous.

[0030] As Figure 1 shown, the radio admittance material level meter in an embodiment of the utility model includes the probe rod 200 and the electronic bin 100.

[0031] Among them, the circuit assembly is arranged in the electronic bin 100.The probe rod 200 includes the central electrode 210, the insulating sleeve 220, the protection tube 230 and the connecting piece 240.The connecting piece 240 is used to install the electronic bin 100, the connecting piece 240 is fixedly installed with one end of the protection tube 230, one end of the central electrode 210 is arranged in the inside of the connecting piece 240 and is connected with the circuit assembly, the other end extends to the inside of the protection tube 230 through the connecting piece 240, part of the insulating sleeve 220 is located in the protection tube 230 and is sleeved on the central electrode 210, and the gap is arranged between the protection tube 230 and the insulating sleeve 220.

[0032] In an embodiment, the circuit assembly includes a continuous radio frequency capacitor, an EMC isolation module, etc., and the main function of the circuit assembly is data processing. The circuit assembly is connected to the central electrode 210 through the wiring terminal and the cable. The central electrode 210 is made of a conductive metal. The central electrode 210 can form a capacitor structure with the medium to be measured and the container loaded with the medium to be measured. When the height of the medium in the container changes, the impedance of the capacitor changes synchronously. The circuit assembly in the electronic bin detects the impedance of the capacitor to realize the level monitoring.

[0033] As shown in Figure 1 In an embodiment, the connecting piece 240 can include a process head 241 and a terminal box head 242. The top of the process head 241 is fixedly installed with the terminal box head 242, and the bottom of the process head 241 is fixedly installed with one end of the protection tube 230. The bottom of the electronic bin 100 and the top of the terminal box head 242 are respectively provided with an inner thread and an outer thread matched with each other, and the two are threadedly connected.

[0034] The electronic bin 100 can also be provided with a screw hole and a clamping screw 101. The clamping screw 101 is fixedly installed with the electronic bin 100 through the screw hole and clamps the terminal box head 242 to ensure that the relative position of the terminal box head 242 and the electronic bin 100 is fixed. The outer thread of the terminal box head 242 can also be provided with a sealing ring to enhance the sealing performance.

[0035] Preferably, the terminal box head 242 is filled with glue to prevent liquid from entering the inside of the electronic bin 100 through the inside of the terminal box head 242 to corrode the circuit assembly.

[0036] In other embodiments, the connecting piece 240 can also be integrally arranged.

[0037] As shown in Figure 2 The central electrode 210 includes an electrode body 211 and a plug-in seat 212. The plug-in seat 212 is arranged in the inside of the process head 241. One end of the plug-in seat 212 is connected with the circuit assembly, and the other end is fixedly installed with one end of the electrode body 211. The other end of the electrode body 211 extends to the inside of the protection tube 230 through the process head 241. The insulating sleeve 220 is sleeved on the electrode body 211 and extends to the plug-in seat 212 and the process head 241 to insulate and isolate the plug-in seat 212 and the process head 241.

[0038] Specifically, the plug-in seat 212 extends radially to form a fixed part 213. The insulating sleeve 220 extends to the first end surface of the fixed part 213 and abuts against the inner wall of the process head 241.

[0039] In an embodiment, the first end surface of the fixed portion 213 is the bottom surface thereof, the bottom surface of the fixed portion 213 and the inner wall of the process tooth 241 form a matching inclined surface, the insulating sleeve 220 extends between the bottom of the fixed portion 213 and the inner wall of the process tooth 241, and the plug-in seat 212 can be pressed downward during assembly, so that the fixed portion 213 and the process tooth 241 can press the insulating sleeve 220, and the insulating sleeve 220 can form a good seal between the process tooth 241 and the plug-in seat 212.

[0040] It can be understood that the bottom of the fixed portion 213 does not necessarily form Figure 2 the inclined surface shown, but can also be a flat surface, a curved surface, a downwardly inclined surface, and the like. Of course, the insulating sleeve 220 can also continue to extend into the interior of the process tooth 241, and can even extend into the line box tooth 242. The insulating sleeve 220 can also completely cover the electrode body 211 and the plug-in seat 212, and only a through hole for the cable to pass through is needed.

[0041] Preferably, the inner diameter of the lower end of the process tooth 241 and the outer diameter of the insulating sleeve 220, and the inner diameter of the insulating sleeve 220 and the outer diameter of the electrode body 211 are matched according to the practical interval. The inner diameter of the lower end of the process tooth 241 can be exactly the same as the outer diameter of the insulating sleeve 220, or can be slightly smaller than the outer diameter of the insulating sleeve 220. The inner diameter of the insulating sleeve 220 can be exactly the same as the outer diameter of the electrode body 211, or can be slightly smaller than the outer diameter of the electrode body 211. In this way, during assembly, the process tooth 241, the insulating sleeve 220 and the electrode body 211 can be tightly and stably fixed, and are not easy to shake.

[0042] As Figure 2 shown, in an embodiment, the probe rod 200 further comprises a pressing member 214, an insulating gasket 215 and an insulating sleeve 216.

[0043] The insulating gasket 215 is sleeved on the plug-in seat 212 and abuts against the second end surface of the fixed portion 213 at one end, the pressing member 214 is fixedly installed between the process tooth 241 and the plug-in seat 212, and the other end of the insulating gasket 215 abuts against the pressing member 214. The insulating gasket 215 can form insulating isolation between the plug-in seat 212 and the process tooth 241, and between the fixed portion 213 of the pressing member 214 and the plug-in seat 212. The insulating sleeve 216 is arranged between the pressing member 214 and the plug-in seat 212, and the insulating sleeve 216 is used to insulate and isolate the pressing member 214 and the plug-in seat 212.

[0044] Specifically, the bottom end of the insulating pad 215 abuts against the top surface of the fixing part 213, and the bottom end of the pressing part 214 abuts against the top end of the insulating pad 215. During installation, the pressing part 214 can be pressed downward to press the insulating pad 215 and be fixed with the process tooth head 241, so that the insulating pad 215 further synchronously presses the plug-in seat 212 and the process tooth head 241, thereby ensuring the sealing of the insulating sleeve 220.

[0045] The outer side of the pressing part 214 and the inner side of the process tooth head 241 can be respectively provided with matching external threads and internal threads, and the two are connected through threads. The pressing part 214 and the process tooth head 241 can also be installed through welding, gluing, clamping and the like.

[0046] In an embodiment, the pressing part 214 and the insulating sleeve 216 are sleeved on the plug-in seat 212. The bottom of the insulating sleeve 216 can also extend radially to form an abutting part. The bottom of the abutting part abuts against the plug-in seat 212, and the top of the abutting part abuts against the pressing part 214. When the pressing part 214 presses the plug-in seat 212 through the insulating pad 215, the pressing part 214 can also press the plug-in seat 212 through the insulating sleeve 216.

[0047] As shown in Figure 2 In an embodiment, the outer diameter of the bottom of the process tooth head 241 is equal to the inner diameter of the protective tube 230. The protective tube 230 is inserted into the bottom of the process tooth head 241 and then is welded and fixed with the process tooth head 241, thereby ensuring good sealing and stability.

[0048] As shown in Figure 3 In an embodiment, the probe rod 200 further includes a buckle 231 for fixing the insulating sleeve 220. The buckle 231 can be installed at the end of the protective tube 230 away from the connecting part 240. The bottom of the insulating sleeve 220 is positioned and fixed by the buckle 231, and the top of the insulating sleeve 220 is positioned and fixed by the process tooth head 241, thereby avoiding the problem of inaccurate measurement caused by the shaking of the insulating sleeve 220 and the central electrode 210.

[0049] The buckle 231 is annular as a whole. The outer diameter of the top of the buckle 231 is the same as the inner diameter of the bottom of the protective tube 230. The protective tube 230 is inserted into the top of the buckle 231 and then is welded and fixed with the buckle 231, thereby ensuring good sealing and stability. The inner wall of the buckle 231 abuts against the insulating sleeve 220 to play a fixing and positioning role.

[0050] In an embodiment, the insulating sleeve 220 can include an insulating tube 221 and an insulating bottom plate 222. The bottom of the insulating tube 221 is sealingly installed with the insulating bottom plate 222 and forms a space inside for accommodating the central electrode 210.

[0051] As shown in Figure 4As shown, in an embodiment, the buckle 231 is provided with a liquid discharge hole 232, and the liquid to be measured can enter between the protection tube 230 and the insulating sleeve 220 from the liquid discharge hole 232, so that the central electrode 210 can correctly sense the liquid level.

[0052] In other embodiments, a first through hole for discharging liquid can also be formed on the protection tube 230, and the first through hole can be arranged at one end of the protection tube 230 away from the connecting piece 240, so that the liquid to be measured can enter between the protection tube 230 and the insulating sleeve 220 from the first through hole.

[0053] In an embodiment, a second through hole for discharging gas is also formed on the protection tube 230, and the second through hole is arranged at one end of the protection tube 230 close to the connecting piece 240. When the liquid to be measured enters the protection tube 230, the original gas in the protection tube 230 can be discharged outwardly from the second through hole, thereby ensuring that the gas pressure inside and outside the protection tube 230 is balanced, and avoiding that the gas pressure between the protection tube 230 and the insulating sleeve 220 is too high to cause the liquid to be unable to enter the protection tube 230 and cause inaccurate measurement.

[0054] In an embodiment, the electronic bin 100 is made of aluminum alloy. The connecting piece 240, the pressing piece 214, and the protection tube 230 are made of SUS316L material, which has good pressure resistance and corrosion resistance. The insulating sleeve 220, the insulating gasket 215, and the insulating shaft sleeve 216 are made of PFA material, which has certain elasticity while being insulating, and can play a sealing role.

[0055] In actual application process, by arranging the protection tube 230 outside the central electrode 210 and the insulating sleeve 220, the leakage of internal generated energy can be isolated, and the explosion-proof performance of the overall structure is improved. By forming the through hole and the liquid discharge hole 232, the normal flowability of the medium between the protection tube 230 and the insulating sleeve 220 is met. The arrangement of the buckle 231 can make the probe rod 200 stable as a whole, prevent the liquid level from being displayed deviated due to excessive shaking of the liquid level, and ensure that the circuit can work normally while being shock-absorbing and protective.

[0056] In the installation process, the insulating sleeve 220 and the connecting piece 240 are pressed by arranging the pressing piece 214 and the insulating gasket 215 and the insulating shaft sleeve 216, the sealing between the insulating sleeve 220 and the connecting piece 240 is ensured, and it is ensured that the medium will not enter the connecting piece 240 to interfere with the central electrode 210. By fully filling glue in the online box tooth head 242, it is ensured that the medium will not enter the inside of the electronic bin 100 to corrode the circuit. The installation structure design inside the connecting piece 240 reduces unnecessary welding or threaded connection, and ensures that the pressure strength of the level meter reaches 1.6 MPa.

[0057] It is apparent for a person skilled in the art that the present application is not limited to the details of the above-described exemplary embodiments, but that it can be implemented in other concrete forms without departing from the spirit or the essential characteristics of the present application. Therefore, the embodiments should be considered as exemplary and non-limiting, the scope of the present application being defined by the claims appended hereto rather than by the above description, and all the changes which fall within the meaning and the scope of the equivalent elements of the claims are intended to be embraced therein. Any reference signs in the claims should not be construed as limiting the claims to the figures in which the reference signs are used.

[0058] Furthermore, it should be understood that although the present specification describes exemplary embodiments, not every embodiment contains only one independent technical solution, and the present specification is described in this way only for the sake of clarity, and a person skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that a person skilled in the art can understand.

Claims

1. A probe for use in a radio frequency admittance level gauge, the radio frequency admittance level gauge comprising an electronic chamber, wherein a circuit assembly is disposed within the electronic chamber, characterized in that, The probe includes a central electrode, an insulating sleeve, a protective tube, and a connector. The connector is used to install the electronic compartment. The connector is fixedly installed to one end of the protective tube. One end of the central electrode is located inside the connector and connected to the circuit assembly, while the other end extends through the connector into the interior of the protective tube. Part of the insulating sleeve is located inside the protective tube and sleeved on the central electrode. A gap is provided between the protective tube and the insulating sleeve.

2. The probe rod according to claim 1, characterized in that, The probe also includes a clip for securing the insulating sleeve.

3. The probe rod according to claim 2, characterized in that, The buckle is installed at the end of the protective tube away from the connector.

4. The probe rod according to claim 2, characterized in that, The buckle is provided with a drain hole.

5. The probe rod according to claim 1, characterized in that, The protective tube is provided with a first through hole for draining liquid and / or a second through hole for venting gas.

6. The probe rod according to claim 1, characterized in that, The central electrode includes an electrode body and a connector. The connector is disposed inside the connector. One end of the connector is connected to the circuit assembly, and the other end is fixedly installed to one end of the electrode body. The other end of the electrode body extends through the connector into the interior of the protective tube. The insulating sleeve is fitted on the electrode body and extends between the connector and the connector to insulate and isolate the connector from the connector.

7. The probe rod according to claim 6, characterized in that, A fixing portion extends radially from the plug-in socket, and the insulating sleeve extends between the first end face of the fixing portion and the inner wall of the connector, and abuts against the first end face of the fixing portion and the inner wall of the connector.

8. The probe rod according to claim 7, characterized in that, The probe also includes a clamping member and an insulating gasket. The insulating gasket is sleeved on the plug-in seat and one end abuts against the second end face of the fixing part. The clamping member is disposed between the connector and the plug-in seat and is fixedly installed with the connector. The clamping member abuts against the other end of the insulating gasket.

9. The probe rod according to claim 8, characterized in that, The probe also includes an insulating bushing disposed between the clamping member and the plug-in socket, the insulating bushing being used to insulate and isolate the clamping member from the plug-in socket.

10. A radio frequency admittance level gauge, characterized in that, It includes an electronic compartment and a probe as described in any one of claims 1 to 9, wherein the electronic compartment is fixedly installed with the connector, and a circuit assembly connected to the central electrode is provided inside the electronic compartment.

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