Molybdenum electrode penetrating type novel permanent magnet flowmeter

Abstract

The invention discloses a novel molybdenum electrode penetrating type permanent magnet flowmeter which comprises a magnetic steel assembly and an electrode assembly. A through hole matched with a pipeline is formed in the center of a permanent magnet in the magnetic steel assembly. Pure iron and electromagnetic pure iron are installed at the upper end, the lower end and the two sides of the permanent magnet respectively. The electrode assembly comprises a contact electrode, an extraction electrode and a sleeve, the end of the contact electrode is in a molybdenum material hemisphere shape and penetrates into a pipeline to make contact with liquid metal, the surface of the contact electrode is sleeved with the connecting sleeve, the extraction electrode is arranged at the end of the connecting sleeve, and the extraction electrode is inserted into the connecting sleeve. A spring is propped between the two end parts of the extraction electrode and the contact electrode in the connecting sleeve; the extension direction of the contact electrode, the axis direction of the pipeline and the direction of the uniform magnetic field are perpendicular to one another, the spring is additionally arranged between the contact electrode and the extraction electrode to avoid thermal expansion damage, the contact electrode makes direct contact with liquid metal, errors of the flowmeter are reduced, and the metal molybdenum electrode has a better effect on transmission of potential signals.

Description

Technical Field

[0001] The invention relates to the technical field of flowmeters, and more particularly to a new type of permanent magnetic flowmeter with molybdenum electrodes penetrating therethrough. Background Art

[0002] Since liquid metal coolant has large specific heat capacity, high thermal conductivity, low melting point, high boiling point, and good thermal performance, most reactors now use various liquid metals as coolants, and measuring the flow rate of liquid metal in the reactor has become a top priority. Although there are many types of flow meters, there are few flow meters that can continue to work under high temperature and high radiation conditions, among which electromagnetic flowmeter is one of them. As a type of electromagnetic flowmeter, permanent magnetic flowmeter has the advantages of high temperature resistance, radiation resistance, wide range, large caliber, sensitive response, simple structure, etc., and is widely used in measuring liquid metal flow.

[0003] The electrodes currently used in permanent magnet liquid metal flowmeters do not penetrate the inner diameter of the pipe and are in contact with the liquid metal. Due to the shunt effect of the pipe wall, this will lead to a decrease in the potential signal and low accuracy. In addition, most current lead-bismuth reactors use liquid lithium-lead alloy as a coolant. If general metal materials are used as electrodes, they are prone to corrosion when in contact with liquid metal, which will affect the service life and measurement accuracy.

[0004] Therefore, how to provide a new type of flow meter with high measurement accuracy is an urgent problem to be solved by those skilled in the art. Summary of the invention

[0005] In view of this, the present invention provides a new type of permanent magnetic flowmeter with molybdenum electrodes penetrating the electrode, which can be used in a lead-bismuth reactor to measure the flow of liquid lithium-lead alloy.

[0006] To achieve the above object, the present invention adopts the following technical solution:

[0007] A new type of permanent magnetic flowmeter with molybdenum electrode penetration, comprising: a magnetic steel component and an electrode component;

[0008] The magnetic steel assembly includes permanent magnet, pure iron, and electromagnetic pure iron;

[0009] A through hole matching the pipeline is arranged at the center of the permanent magnet;

[0010] The pure iron is installed at the upper and lower ends of the permanent magnet, and the electromagnetic pure iron is installed on both sides of the permanent magnet;

[0011] The electrode assembly includes a contact electrode, an extraction electrode and a sleeve. The end of the contact electrode is a molybdenum hemispherical electrode that penetrates into the pipeline to contact the liquid metal. The connecting sleeve is sleeved on the surface of the contact electrode. The extraction electrode is arranged at the end of the connecting sleeve and inserted into the connecting sleeve. A spring is abutted between the two ends of the extraction electrode and the contact electrode in the connecting sleeve.

[0012] The electrode assembly passes through the electromagnetic pure iron, the permanent magnet and the pipeline wall to contact the liquid metal in the pipeline;

[0013] The extending direction of the contact electrode, the axial direction of the pipeline and the direction of the uniform magnetic field are perpendicular to each other.

[0014] Preferably, it also includes a clamping device, which includes a clamping block and a connecting frame. The clamping block is wrapped around the outer wall of the pipeline, and the clamping block is fixed to the electromagnetic pure iron through the connecting frame.

[0015] Furthermore, it also includes an adapter plate, and the connecting frame is installed on the electromagnetic pure iron through the adapter plate.

[0016] Furthermore, it also includes a heat insulation layer, which is arranged between the outer wall of the pipeline and the compression block.

[0017] Preferably, a heat sink is provided on the electromagnetic pure iron to dissipate heat for the electrode and reduce the influence of thermoelectric potential on the potential signal.

[0018] Preferably, it also includes a hanging ring, which is installed on the magnetic steel assembly.

[0019] Preferably, a ceramic sleeve is provided on a portion of the outer wall of the sleeve located on the electromagnetic pure iron.

[0020] Preferably, the lead-out electrode comprises a contact end and a fixed end of an integral design, the contact end is inserted into a sleeve and the spring is sleeved on a surface of the contact end, and the fixed end is located outside the sleeve.

[0021] Furthermore, the fixed end surface is provided with a groove.

[0022] It can be seen from the above technical solutions that, compared with the prior art, the present invention discloses a new type of permanent magnetic flowmeter with molybdenum electrode penetration, which has the following beneficial effects:

[0023] A spring is added between the contact electrode and the lead-out electrode of the present invention, considering that in a high temperature environment, the electrode will not be damaged even if there is a thermal expansion effect. The contact electrode of the present invention is in direct contact with the liquid metal, thereby reducing the shunting effect of the tube wall and reducing the error of the potential signal during the propagation process, thereby reducing the error of the flowmeter. The present invention also uses metal molybdenum as an electrode. Compared with ordinary through-type electrodes such as copper, it has better corrosion resistance and stable chemical properties. When in contact with liquid metal and air, it is less likely to undergo electrochemical reactions, can be used for a longer time, and has a better effect on the transmission of potential signals. This flowmeter adopts a molybdenum electrode through-type structure, which can be used for accurate measurement of lead-bismuth high-temperature reactor flowmeters. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0025] Figure 1 This is the overall structure diagram of the new type of permanent magnetic flowmeter with molybdenum electrodes penetrating the present invention;

[0026] Figure 2 It is a partial enlarged view of the pipeline and electrode assembly of the new type of permanent magnetic flowmeter with molybdenum electrodes penetrating the present invention;

[0027] Figure 3 It is a partial front view of the pipeline and electrode assembly of the new type of permanent magnetic flowmeter with molybdenum electrodes penetrating the present invention;

[0028] Among them, 1-lifting ring, 2-magnetic steel assembly, 201-pure iron, 202-permanent magnet, 203 electromagnetic pure iron, 204-adapter plate, 3-pipeline, 4-heat sink, 501-contact electrode, 502-ceramic sleeve, 503-sleeve, 504-spring, 505-lead-out electrode, 6-connecting frame, 7-pressing block, 8-thermal insulation layer. DETAILED DESCRIPTION

[0029] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] As attached Figure 1 As shown, the new type of permanent magnetic flowmeter with molybdenum electrode penetration includes: a magnetic steel component 2 and an electrode component;

[0031] The magnetic steel assembly includes a permanent magnet 202, pure iron 201, and an electromagnetic pure iron 203;

[0032] A through hole matching the pipe 3 is provided at the center of the permanent magnet 202;

[0033] Pure iron 201 is installed at the upper and lower ends of the permanent magnet 202, and electromagnetic pure iron 203 is installed on both sides of the permanent magnet 202. The pure iron 201 and the electromagnetic pure iron 203 tightly surround the permanent magnet 202, and the three are tightly fixed together to form a closed magnetic circuit.

[0034] The electrode assembly includes a contact electrode 501, an extraction electrode 505 and a sleeve 503. The end of the contact electrode 501 is a molybdenum hemispherical end that penetrates into the pipe 3 to contact the liquid metal. The sleeve 503 is sleeved on the surface of the contact electrode 501. The extraction electrode 505 is arranged at the end of the sleeve 503, and the extraction electrode 505 is inserted into the sleeve 503. A spring 504 is abutted between the two ends of the extraction electrode 505 and the contact electrode 501 in the sleeve 503. The spring 504 can be made of stainless steel.

[0035] The electrode assembly passes through the electromagnetic pure iron 203, the permanent magnet 202 and the wall of the pipeline 3 and contacts the liquid metal in the pipeline 3;

[0036] The extension direction of the contact electrode 501, the axial direction of the pipeline 3 and the direction of the uniform magnetic field are perpendicular to each other, so that the electrode assembly can respond to the potential signal used to characterize the flow rate generated by the liquid metal in the pipeline 3 flowing through the flowmeter.

[0037] Some specific improved devices, such as the attached Figure 1 As shown, it also includes a clamping device, which includes a clamping block 7 and a connecting frame 6. The clamping block 7 is wrapped around the outer wall of the pipeline 3, and the clamping block 7 is fixed to the electromagnetic pure iron 203 through the connecting frame 6. The clamping block 7 and the connecting frame 6 can be detachably connected by bolts.

[0038] Some specific improved devices, such as the attached Figure 1 As shown, it also includes an adapter plate 204, and the connecting frame 6 is installed on the electromagnetic pure iron 203 through the adapter plate 204.

[0039] Some specific improved devices, such as the attached Figure 1 As shown, it also includes a heat insulation layer 8, which is arranged between the outer wall of the pipeline 3 and the compression block 7.

[0040] Some specific improved devices, such as the attached Figure 1As shown, a heat sink 4 is provided on the electromagnetic pure iron 203. The middle of the heat sink 4 is a semicircular part, and the two sides are rectangular fixed ends. One contact electrode 501 requires two heat sinks 4. The heat sink 4 is located between the ceramic sleeve 502 and the thicker part of the lead-out electrode 505. The semicircular part is sleeved on the outside of the sleeve 503, and the fixed ends extend radially outward from both ends of the semicircular segment, which can dissipate heat for the electrode and reduce the influence of thermoelectric potential on the potential signal.

[0041] Some specific improved devices, such as the attached Figure 1 As shown, it also includes a lifting ring 1, which is installed on the magnetic steel assembly 2 to facilitate the fixation of the magnetic steel assembly 2.

[0042] Some specific improved devices, such as the attached Figure 2 As shown, a ceramic sleeve 502 is provided on the outer wall of the sleeve 503 located at the electromagnetic pure iron 203 to play an insulating role.

[0043] Some specific improved devices, such as the attached Figure 2-3 As shown, the extraction electrode 505 includes a contact end and a fixed end of an integral design, the contact end is inserted into the sleeve and the spring is sleeved on the surface of the contact end, and the fixed end is located outside the sleeve. A groove is provided on the surface of the fixed end, that is, the portion of the extraction electrode 505 inside the sleeve 503 is thinner and has a groove in the middle, and a portion of the stainless steel spring 504 can be accommodated in the groove. The portion of the extraction electrode 505 outside the sleeve 503 is then in a thick cylindrical shape and then in a thin cylindrical shape, which is convenient for fixed assembly.

[0044] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0045] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A new type of permanent magnetic flowmeter with molybdenum electrode penetration, characterized in that: include: Magnetic steel assembly and electrode assembly; The magnetic steel assembly includes permanent magnet, pure iron, and electromagnetic pure iron; A through hole matching the pipeline is arranged at the center of the permanent magnet; The pure iron is installed at the upper and lower ends of the permanent magnet, and the electromagnetic pure iron is installed on both sides of the permanent magnet; The electrode assembly includes a contact electrode, an extraction electrode and a sleeve. The end of the contact electrode is a molybdenum hemispherical electrode that penetrates into the pipeline to contact the liquid metal. The connecting sleeve is sleeved on the surface of the contact electrode. The extraction electrode is arranged at the end of the connecting sleeve and inserted into the connecting sleeve. A spring is abutted between the two ends of the extraction electrode and the contact electrode in the connecting sleeve. The electrode assembly passes through the electromagnetic pure iron, the permanent magnet and the pipeline wall to contact the liquid metal in the pipeline; The extending direction of the contact electrode, the axial direction of the pipeline and the direction of the uniform magnetic field are perpendicular to each other.

2. A new type of permanent magnetic flowmeter with molybdenum electrode penetration according to claim 1, characterized in that: It also includes a clamping device, which includes a clamping block and a connecting frame. The clamping block is wrapped around the outer wall of the pipeline, and the clamping block is fixed on the electromagnetic pure iron through the connecting frame.

3. A new type of permanent magnetic flowmeter with molybdenum electrode penetration according to claim 2, characterized in that: It also includes an adapter plate, and the connecting frame is installed on the electromagnetic pure iron through the adapter plate.

4. A new type of permanent magnetic flowmeter with molybdenum electrode penetration according to claim 2, characterized in that: It also includes a heat insulation layer, which is arranged between the outer wall of the pipeline and the compression block.

5. The novel permanent magnetic flowmeter with molybdenum electrode penetration according to claim 1 is characterized in that: A heat sink is arranged on the electromagnetic pure iron.

6. The novel permanent magnetic flowmeter with molybdenum electrode penetration according to claim 1 is characterized in that: It also includes a lifting ring, which is installed on the magnetic steel assembly.

7. The novel permanent magnetic flowmeter with molybdenum electrode penetration according to claim 1 is characterized in that: The outer wall of the sleeve located at the electromagnetic pure iron portion is provided with a ceramic sleeve.

8. The novel permanent magnetic flowmeter with molybdenum electrode penetration according to claim 1 is characterized in that: The lead-out electrode comprises a contact end and a fixed end which are designed in an integral manner. The contact end is inserted into the sleeve and the spring is sleeved on the surface of the contact end. The fixed end is located outside the sleeve.

9. A new type of permanent magnetic flowmeter with molybdenum electrode penetration according to claim 8, characterized in that: The fixed end surface is provided with a groove.

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