CN110567553A - Top sealing and positioning structure for capacitive liquid level meter and capacitive liquid level meter - Google Patents
Top sealing and positioning structure for capacitive liquid level meter and capacitive liquid level meter Download PDFInfo
- Publication number
- CN110567553A CN110567553A CN201910840031.0A CN201910840031A CN110567553A CN 110567553 A CN110567553 A CN 110567553A CN 201910840031 A CN201910840031 A CN 201910840031A CN 110567553 A CN110567553 A CN 110567553A
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- Prior art keywords
- sealing
- tube
- positioning
- mounting
- liquid level
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/26—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields
- G01F23/263—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors
Abstract
The invention discloses a top sealing and positioning structure for a capacitive liquid level meter and the capacitive liquid level meter, wherein the top sealing and positioning structure comprises a sealing and positioning plug, a first sealing ring and a second sealing ring, the sealing and positioning plug is provided with a first mounting column for fixedly arranging a cathode pipe sleeve of the capacitive liquid level meter and a second mounting column for fixedly arranging an anode pipe sleeve of the capacitive liquid level meter, the first mounting column and the second mounting column are coaxially arranged, the outer side wall of the first mounting column is provided with a first annular groove and a first mechanical sealing structure, the outer side wall of the second mounting column is provided with a second annular groove and a second mechanical sealing structure, the first sealing ring is embedded in the first annular groove, and the second sealing ring is embedded in the second annular groove. The top sealing and positioning structure disclosed by the invention can realize the installation and positioning of the anode tube and the cathode tube, meets the concentricity requirement of the anode tube and the cathode tube, can realize the double sealing of the anode tube and the cathode tube, and has the advantages of simple manufacture and low cost.
Description
Technical Field
The invention relates to the technical field of structures of capacitive liquid level meters, in particular to a top sealing and positioning structure for a capacitive liquid level meter and the capacitive liquid level meter.
Background
The capacitance type liquid level meter in the prior art comprises an anode tube and a cathode tube, wherein the anode tube is arranged in the cathode tube in a penetrating mode, the anode tube and the cathode tube are positioned through a sealing piece, so that the anode tube and the cathode tube are arranged at intervals, an opening is formed in the bottom of the capacitance type liquid level meter, liquid media with the height of H can be filled between the anode tube and the cathode tube through the opening, and the capacitance formed by the capacitance type liquid level meter changes along with the change of the liquid level height H.
In order to facilitate the fixation, the top sealing and positioning structural member and the top of the anode tube, and the top mounting flange and the top of the cathode tube are generally fixedly connected in a welding or extruding manner, but the top sealing and positioning structural member is inconvenient to disassemble and high in manufacturing cost.
Disclosure of Invention
The invention aims to provide a top sealing and positioning structure for a capacitive liquid level meter and a liquid level sensor, and aims to solve the technical problems that the top sealing and positioning structure of the capacitive liquid level meter in the prior art is fixedly connected with the top of an anode tube in a welding or extruding mode, so that the capacitive liquid level meter is inconvenient to disassemble, low in production efficiency and high in manufacturing cost.
In order to achieve the purpose, the invention provides the following scheme:
the invention provides a top sealing and positioning structure for a capacitance type liquid level meter, which is used for installing and fixing a cathode tube and an anode tube of the capacitance type liquid level meter, and comprises a sealing and positioning plug, a first sealing ring and a second sealing ring, wherein the sealing and positioning plug is provided with a first installation column for fixedly sleeving the cathode tube and a second installation column for fixedly sleeving the anode tube, the outer diameter of the first installation column is larger than that of the second installation column, the first installation column and the second installation column are coaxially arranged, the outer side wall of the first installation column is concavely provided with a first annular groove and convexly provided with a first mechanical sealing structure for mechanically sealing the cathode tube, the outer side wall of the second installation column is concavely provided with a second annular groove and convexly provided with a second mechanical sealing structure for mechanically sealing the anode tube, the first sealing ring is embedded in the first annular groove, and the second sealing ring is embedded in the second annular groove.
Furthermore, the first mechanical sealing structure is a plurality of first annular bulges which are convexly arranged on the outer side wall of the first mounting column and are arranged at intervals along the axial direction of the first mounting column; the second mechanical sealing structure is a plurality of second annular bulges which are convexly arranged on the outer side wall of the second mounting column and are arranged at intervals along the axial direction of the second mounting column.
further, the first annular groove is formed in the middle of the first mechanical sealing structure.
Furthermore, the outer side wall of one end, far away from the second mounting column, of the first mounting column is provided with a first limiting protrusion for axially limiting the cathode tube.
Furthermore, one side of the first mounting column, which is far away from the second mounting column, is also provided with a supporting and positioning column for fixing the PCB.
Further, the second annular groove is formed in one side, away from the first mechanical sealing structure, of the second mechanical sealing structure and is arranged at an interval with the second mechanical sealing structure.
Furthermore, a second limiting protrusion used for limiting the positive tube in the axial direction is arranged on the outer side wall of one end, close to the first mounting column, of the second mounting column, and the outer diameter of the second limiting protrusion is smaller than that of the first mounting column.
Further, top seal location structure still includes contact piece and self-tapping screw, sealed locating plug offer be used for the power supply electrode lead wire wear establish the through wires hole and with the locating hole that the through wires hole is linked together, the contact piece includes the bottom plate and locates the curb plate of the relative both sides of bottom plate, the mounting hole has been seted up to the bottom plate, self-tapping screw passes attack behind the mounting hole in the locating hole in order to fix the bottom plate sealed locating plug bottom, two the curb plate struts with the butt positive pole tube.
the invention also provides a capacitance type liquid level meter which comprises an anode tube, a cathode tube and the top sealing and positioning structure, wherein the cathode tube is sleeved outside the first mounting column and is in interference fit with the first mounting column, the anode tube is sleeved outside the second mounting column and is in interference fit with the second mounting column, and the contact point sheet is partially clamped between the first mounting column and the anode tube.
Further, the capacitance type liquid level meter further comprises a PCB, an electrode lead and a conducting strip, wherein one end of the electrode lead is connected with the contact piece, the other end of the electrode lead penetrates through the threading hole and then is connected with the PCB, one end of the conducting strip is electrically connected with the cathode tube, and the other end of the conducting strip is connected with the PCB.
Compared with the prior art, the invention has the beneficial effects that:
when the top sealing and positioning structure disclosed by the invention is applied to a capacitance type liquid level meter, the first mounting column and the cathode tube and the second mounting column and the anode tube are sealed by the sealing rings firstly and then sealed by the mechanical seal to realize double sealing, so that the sealing effect is good;
The U-shaped contact piece and the self-tapping screw are fastened with the inner wall of the anode tube, so that the concentricity between the anode tube and the cathode tube is high, the performance of the capacitance type liquid level meter is excellent, and the measurement precision is high;
Whole top seal location structure overall structure is compact, and the design is exquisite, can effectively reduce the product size, and simple to operate. In addition, the top sealing and positioning structure disclosed by the invention can be formed by injection molding, is simple to manufacture and can effectively reduce the cost.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a cross-sectional view of an assembled top seal positioning structure, a positive tube and a negative tube for a capacitive gauge provided by an embodiment of the present invention;
FIG. 2 is a cross-sectional view of a seal retainer plug provided in accordance with an embodiment of the present invention;
FIG. 3 is a cross-sectional view of a contact patch provided by an embodiment of the present invention;
FIG. 4 is a cross-sectional view of the top of a capacitive gauge provided by an embodiment of the present invention;
FIG. 5 is a top view of a cathode tube provided in an embodiment of the present invention;
FIG. 6 is a cross-sectional view of the bottom of a capacitive gauge provided by an embodiment of the present invention.
In the figure: 10. a cathode tube; 20. a positive electrode tube; 30. sealing the positioning plug; 31. a first mounting post; 311. a first annular groove; 312. a first mechanical seal structure; 313. a first limit protrusion; 314. supporting the positioning column; 32. a second mounting post; 321. a second annular groove; 322. a second mechanical seal structure; 323. a second limit bulge; 324. a card slot; 33. threading holes; 331. a first perforation; 332. a second perforation; 34. positioning holes; 40. a first seal ring; 50. a second seal ring; 60. a PCB board; 70. a contact pad; 71. a base plate; 711. mounting holes; 72. a side plate; 80. a self-tapping screw; 90. an electrode lead; 100. a conductive sheet; 200. a protective cover; 210. a cavity; 220. a third perforation; 230. a top cover; 240. a flange plate; 250. a through hole; 260. an exhaust hole; 300. a rubber plug; 400. positioning seats; 410. a liquid inlet hole; 500. reinforcing rib plates; 510. an open slot; 600. and a third sealing ring.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
it should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
It will also be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
In addition, the descriptions related to "first", "second", etc. in the present invention are 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 at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
Referring to fig. 1 to 6, an embodiment of the present invention provides a top sealing and positioning structure for a capacitive liquid level meter, which is used for mounting and fixing a cathode tube 10 and an anode tube 20 of the capacitive liquid level meter, wherein the anode tube 20 is inserted into the cathode tube 10, the top sealing and positioning structure includes a sealing and positioning plug 30, a first sealing ring 40 and a second sealing ring 50, the sealing and positioning plug 30 is provided with a first mounting post 31 for fixedly sleeving the cathode tube 10 and a second mounting post 32 for fixedly sleeving the anode tube 20, an outer diameter of the first mounting post 31 is larger than an outer diameter of the second mounting post 32, and the first mounting post 31 and the second mounting post 32 are coaxially disposed, so as to ensure that the anode tube 20 and the cathode tube 10 are coaxially disposed, and the anode tube 20 and the cathode tube 10 are not in contact with each other. The positive electrode tube 20 and the negative electrode tube 10 in this embodiment are preferably metal tubes made of aluminum, but other metal tubes that can generate capacitance when combined may be used.
Referring to fig. 1 to 2, a first annular groove 311 is concavely formed on an outer sidewall of the first mounting post 31 and a first mechanical sealing structure 312 for mechanical sealing of the cathode tube 10 is convexly formed thereon, a second annular groove 321 is concavely formed on an outer sidewall of the second mounting post 32 and a second mechanical sealing structure 322 for mechanical sealing of the anode tube 20 is convexly formed thereon, the first sealing ring 40 is embedded in the first annular groove 311, and the second sealing ring 50 is embedded in the second annular groove 321, so as to achieve double sealing of the top of the anode tube 20 and double sealing of the top of the cathode tube 10.
Preferably, the first mechanical sealing structure 312 is a plurality of first annular protrusions protruding from the outer sidewall of the first mounting column 31 and arranged at intervals along the axial direction of the first mounting column 31; the second mechanical sealing structure 322 is a plurality of second annular protrusions protruding from the outer sidewall of the second mounting post 32 and spaced along the axial direction of the second mounting post 32, the first annular protrusions and the second annular protrusions are inverted sawtooth-shaped in cross section, and after mechanical sealing, external water, ash layer, etc. can be prevented from entering the cathode tube 10 or the anode tube 20 from the top of the capacitance type liquid level meter.
In a preferred embodiment, a first annular groove 311 is provided in the middle of the first mechanical seal structure 312 to mechanically seal the first seal ring 40, so that the seal positioning plug 30 has oil-proof, water-proof and sealing properties.
In a preferred embodiment, the outer side wall of the first mounting post 31 at the end far away from the second mounting post 32 is provided with a first limit protrusion 313 for forming an axial limit on the cathode tube 10, so as to prevent a slippage phenomenon between the cathode tube 10 and the seal positioning plug 30.
In a preferred embodiment, a side of the first mounting post 31 away from the second mounting post 32 is further provided with a supporting positioning post 314 for fixing the PCB 60, so as to facilitate the mounting and fixing of the PCB 60.
in this embodiment, the second annular groove 321 is disposed on a side of the second mechanical sealing structure 322 away from the first mechanical sealing structure 312 and spaced from the second mechanical sealing structure 322, since the positive tube 20 is disposed in the negative tube 10, the requirement between the positive tube 20 and the seal positioning plug 30 is reduced, each sealing ring is preferably made of rubber, and a double seal of mechanical gap seal and rubber elastic seal is adopted between the second mounting post 32 and the positive tube 20.
In a preferred embodiment, the outer side wall of the second mounting column 32 near one end of the first mounting column 31 is provided with a second limiting protrusion 323 for forming an axial limit for the positive pole tube 20, and the outer diameter of the second limiting protrusion 323 is smaller than that of the first mounting column 31, so as to prevent slippage between the positive pole tube 20 and the seal positioning plug 30.
referring to fig. 3, the top sealing and positioning structure further includes a contact sheet 70 and a tapping screw 80, the sealing and positioning plug 30 is provided with a threading hole 33 for passing the electrode lead 90 and a positioning hole 34 communicated with the threading hole 33, the positioning hole 34 extends from the bottom of the sealing and positioning plug 30 along the axial direction thereof, the contact sheet 70 is preferably U-shaped, the contact sheet 70 includes a bottom plate 71 and side plates 72 disposed on opposite sides of the bottom plate 71, the outer side wall of the second mounting column 32 on the side away from the first mounting column 31 is provided with a slot 324 adapted to the side plates 72, the bottom plate 71 is provided with a mounting hole 711, the tapping screw 80 directly taps into the positioning hole 34 after passing through the mounting hole 711 to fix the bottom plate 71 on the bottom of the sealing and positioning plug 30, after the tapping screw 80 is tightened, the two side plates 72 are spread to positively abut against the pole tube 20, so that the contact sheet 70 is extruded and deformed, and the friction force between the sealing and positioning plug 30 and the positive tube 20 is, so as to bring the seal positioning plug 30 into close contact with the positive electrode tube 20, and to form a good electrical connection. Meanwhile, in order to facilitate the deformation of the contact strip 70, the length of the slot 324 in the axial direction of the second mounting post 32 is smaller than the length of the side plate 72 in the axial direction of the second mounting post 32.
In order to reduce the cost, the threading hole 33 in this embodiment includes a first through hole 331 and a second through hole 332 disposed at an angle with respect to the first through hole 331, an inner diameter of the second through hole 332 is larger than an inner diameter of the first through hole 331 so as to facilitate smooth threading later, the electrode lead 90 sequentially passes through the first through hole 331 and the second through hole 332 for electrical connection with the PCB 60, and the second through hole 332 is disposed coaxially with the positioning hole 34.
Referring to fig. 4, the present invention further provides a capacitive liquid level meter, including an anode tube 20, a cathode tube 10 and the top sealing and positioning structure as described above, wherein the cathode tube 10 is sleeved outside the first mounting post 31, the cathode tube 10 is in interference fit with the first mounting post 31, the anode tube 20 is sleeved outside the second mounting post 32, the anode tube 20 is in interference fit with the second mounting post 32, a part of the contact sheet 70 is clamped between the first mounting post 31 and the anode tube 20, the anode tube 20 and the contact sheet 70 are stably mounted on the first mounting post 31, the concentricity of the cathode tube 10 and the anode tube 20 can be ensured, and the manufacturing cost of the capacitive liquid level meter is reduced.
The capacitive liquid level meter further comprises a PCB 60, an electrode lead 90 and a conducting strip 100, wherein one end of the electrode lead 90 is connected with the contact piece 70, the other end of the electrode lead passes through the mounting hole 711 and then is connected with the PCB 60, one end of the conducting strip 100 is electrically connected with the cathode tube 10, and the other end of the conducting strip is connected with the PCB 60, so that the cathode tube 10, the anode tube 20 and the PCB 60 are electrically connected.
The capacitive liquid level meter further comprises a protective cover 200, a cavity 210 and a third through hole 220 communicated with the cavity 210 are arranged in the protective cover 200, the protective cover 200 comprises a top cover 230 and a flange 240 sleeved outside the cathode tube 10, the top cover 230 is mounted on the flange 240 and surrounds the flange 240 to form the cavity 210 and the third through hole 220, an external line is electrically connected with the PCB 60 through the third through hole 220, the PCB 60, the sealing positioning plug 30, the contact sheet 70, the electrode lead 90, the conducting sheet 100 and the self-tapping screw 80 are all located in the cavity 210, the protective cover 200 can effectively prevent an external ash layer or water from entering the PCB 60, and a through hole 250 for the external screw to penetrate through is further arranged in the flange 240 so as to fix the capacitive liquid level meter on the oil tank.
Referring to fig. 5 and 6, the capacitance type liquid level meter further includes a rubber plug 300 and a positioning seat 400, the rubber plug 300 is provided with a third mechanical sealing structure for mechanically sealing the positive pole tube 20, and a third sealing ring 600 is arranged between the rubber plug 300 and the positive pole tube 20, so as to achieve double sealing of mechanical gap sealing between the bottom of the positive pole tube 20 and the rubber plug 300 and elastic sealing of a rubber piece, and prevent the liquid to be measured from entering the positive pole tube 20, the positioning seat 400 is simultaneously connected with the positive pole tube 20 and the negative pole tube 10, so as to separate the bottom of the positive pole tube 20 and the bottom of the negative pole tube 10, and the positioning seat 400 is provided with a liquid inlet 410, so that the liquid can enter between the outer side wall of the positive pole tube 20 and the inner side wall. The capacitance value of the capacitance type liquid level meter in the present embodiment is linear with the liquid height between the positive electrode tube 20 and the negative electrode tube 10.
Meanwhile, in order to prevent the collision with the cathode tube 10, a plurality of rib plates 500 are further convexly arranged on the outer side wall of the cathode tube 10, the number of the rib plates 500 is specifically four, and the protective cover 200 is covered outside the rib plates 500 in an injection molding manner. Specifically, the outer sidewall of the stiffener plate 500 on the side away from the positive pole tube 20 is concavely provided with an open slot 510, and the open slot 510 axially penetrates through the two ends of the stiffener plate 500, so that two mounting openings are respectively arranged at the two ends of the open slot 510. The capacitance type liquid level meter additionally comprises eight tapping screws 80, wherein two tapping screws 80 penetrate through the conducting strip 100 and then tap into the top mounting openings of the two open grooves 510, so that the conducting strip 100 is fixed by the tapping screws 80; the other two tapping screws 80 directly penetrate through the sealing positioning plugs 30 and tap into the top mounting openings of the other two open grooves 510, and the negative electrode tube 10 and the flange 240 are firmly combined by means of the tensioning force of the tapping screws 80. The remaining four tapping screws 80 pass through the positioning base 400 and tap into the bottom mounting openings of the respective open grooves 510, so that the cathode tube 10 and the positioning base 400 are more stably fixed.
In a preferred embodiment, the upper end of the capacitive liquid level meter is further provided with an exhaust hole 260, the exhaust hole 260 penetrates and extends from the outer side wall of the flange 240 to the inner side wall of the cathode tube 10 through the stiffened plate 500, and when liquid enters from the bottom liquid inlet hole 410 of the capacitive liquid level meter, gas between the anode tube 20 and the cathode tube 10 can be exhausted through the exhaust hole 260, so that pressure difference is avoided.
The installation steps of the capacitance type liquid level meter are as follows: the flange 240 is injection molded on the outer side wall of the top of the negative electrode tube 10, the first sealing ring 40 is installed in the first annular groove 311, the second sealing ring 50 is installed in the second annular groove 321, the tapping screw 80 penetrates through the rear portion of the contact piece 70 and taps into the positioning hole 34, the tapping screw 80 is not screwed continuously at this time, deformation of the contact piece 70 is avoided, the positive electrode tube 20 is sleeved on the second mounting column 32, the second mechanical sealing structure 322 is mechanically sealed by a machine, the tapping screw 80 is screwed tightly, the contact piece 70 is deformed, so that the positive electrode tube 20 and the first mounting column 31 are more firmly mounted, then the negative electrode tube 10 is sleeved on the second mounting column 32, the first mechanical sealing structure 312 and the first sealing ring 40 are mechanically sealed by a machine, and the PCB 60, the electrode lead 90 and the conducting strip 100 are sequentially mounted and fixed by four tapping screws 80, then, the top cover 230 is covered to realize the top fixed seal of the capacitance type liquid level meter; the rubber plug 300 and the bottom of the anode tube 20 are mechanically sealed by a machine, and then the positioning seat 400 is mounted at the bottom of the cathode tube 10 through four self-tapping screws 80 and abuts against the rubber plug 300, so that the bottom of the capacitance type liquid level meter is fixedly sealed.
When the top sealing and positioning structure disclosed by the invention is applied to a capacitance type liquid level meter, firstly, sealing rings are firstly used for sealing between the first mounting column 31 and the cathode tube 10 and between the second mounting column 32 and the anode tube 20, then mechanical sealing is carried out to realize double sealing, and the sealing effect is good; secondly, the U-shaped contact piece 70 and the self-tapping screw 80 are fastened with the inner wall of the anode tube 20, so that the concentricity between the anode tube 20 and the cathode tube 10 is high, the performance of the capacitance type liquid level meter is excellent, and the measurement precision is high; moreover, whole top seal location structure overall structure is compact, and the design is exquisite, can effectively reduce the product size, and simple to operate. In addition, the top sealing and positioning structure disclosed by the invention can simultaneously associate the machinery and the electronics among the flange 240, the cathode tube 10, the anode tube 20 and the PCB 60 through injection molding, so that a highly comprehensive effect is achieved, the plastic with the insulating and oil-resistant properties is used for injection molding, the rapid mass production is realized, the manufacturing is simple, and the cost can be effectively reduced.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A top sealing and positioning structure for a capacitive liquid level meter is used for installing and fixing a cathode tube and an anode tube of the capacitive liquid level meter and is characterized in that the top sealing and positioning structure comprises a sealing and positioning plug, a first sealing ring and a second sealing ring, the sealing and positioning plug is provided with a first installation column for fixing a cathode tube sleeve and a second installation column for fixing an anode tube sleeve, the outer diameter of the first installation column is larger than that of the second installation column, the first installation column and the second installation column are coaxially arranged, a first annular groove is concavely arranged on the outer side wall of the first installation column, a first mechanical sealing structure for mechanical sealing of the cathode tube is convexly arranged, a second annular groove is concavely arranged on the outer side wall of the second installation column, and a second mechanical sealing structure for mechanical sealing of the anode tube is convexly arranged, the first sealing ring is embedded in the first annular groove, and the second sealing ring is embedded in the second annular groove.
2. The top seal positioning structure of claim 1, wherein the first mechanical seal structure is a plurality of first annular protrusions protruding from the outer sidewall of the first mounting post and spaced apart from each other in the axial direction of the first mounting post; the second mechanical sealing structure is a plurality of second annular bulges which are convexly arranged on the outer side wall of the second mounting column and are arranged at intervals along the axial direction of the second mounting column.
3. The top seal positioning structure of claim 1, wherein the first annular groove is provided in a middle portion of the first mechanical seal structure.
4. The top seal positioning structure of claim 1, wherein an outer side wall of one end of the first mounting post, which is far away from the second mounting post, is provided with a first limiting protrusion for axially limiting the cathode tube.
5. The top seal positioning structure of claim 3, wherein a side of the first mounting post remote from the second mounting post is further provided with a support positioning post for fixing a PCB.
6. The top seal positioning structure of claim 1, wherein said second annular groove is provided on a side of said second mechanical seal structure remote from said first mechanical seal structure and spaced from said second mechanical seal structure.
7. The top seal positioning structure of claim 5, wherein the outer side wall of the second mounting column near one end of the first mounting column is provided with a second limiting protrusion for axially limiting the positive tube, and the outer diameter of the second limiting protrusion is smaller than that of the first mounting column.
8. The top seal positioning structure according to claim 1, further comprising a contact piece and a tapping screw, wherein the seal positioning plug is provided with a threading hole for passing an electrode lead and a positioning hole communicated with the threading hole, the contact piece comprises a bottom plate and side plates arranged on two opposite sides of the bottom plate, the bottom plate is provided with a mounting hole, the tapping screw penetrates through the mounting hole and then taps into the positioning hole to fix the bottom plate at the bottom of the seal positioning plug, and the two side plates are spread to abut against the anode tube.
9. a capacitance type liquid level meter comprises an anode tube, a cathode tube and the top sealing and positioning structure as claimed in claim 8, wherein the cathode tube is sleeved outside the first mounting column and is in interference fit with the first mounting column, the anode tube is sleeved outside the second mounting column and is in interference fit with the second mounting column, and the contact point piece is partially clamped between the first mounting column and the anode tube.
10. The capacitive liquid level gauge according to claim 9, further comprising a PCB, an electrode lead and a conductive sheet, wherein one end of the electrode lead is connected to the contact sheet, the other end of the electrode lead passes through the threading hole and is connected to the PCB, one end of the conductive sheet is electrically connected to the cathode tube, and the other end of the conductive sheet is connected to the PCB.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910840031.0A CN110567553A (en) | 2019-09-06 | 2019-09-06 | Top sealing and positioning structure for capacitive liquid level meter and capacitive liquid level meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910840031.0A CN110567553A (en) | 2019-09-06 | 2019-09-06 | Top sealing and positioning structure for capacitive liquid level meter and capacitive liquid level meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110567553A true CN110567553A (en) | 2019-12-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910840031.0A Pending CN110567553A (en) | 2019-09-06 | 2019-09-06 | Top sealing and positioning structure for capacitive liquid level meter and capacitive liquid level meter |
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|---|---|
| CN (1) | CN110567553A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113774406A (en) * | 2021-10-27 | 2021-12-10 | 佛山市摩灵科技有限公司 | Ozone generating device |
-
2019
- 2019-09-06 CN CN201910840031.0A patent/CN110567553A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113774406A (en) * | 2021-10-27 | 2021-12-10 | 佛山市摩灵科技有限公司 | Ozone generating device |
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