CN112090796A - Water level sensor for automobile water tank - Google Patents

Water level sensor for automobile water tank Download PDF

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Publication number
CN112090796A
CN112090796A CN202010888488.1A CN202010888488A CN112090796A CN 112090796 A CN112090796 A CN 112090796A CN 202010888488 A CN202010888488 A CN 202010888488A CN 112090796 A CN112090796 A CN 112090796A
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CN
China
Prior art keywords
main body
water tank
sensor
cleaning
tank main
Prior art date
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Withdrawn
Application number
CN202010888488.1A
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Chinese (zh)
Inventor
马新国
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Individual
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Individual
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Publication date
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Priority to CN202010888488.1A priority Critical patent/CN112090796A/en
Publication of CN112090796A publication Critical patent/CN112090796A/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B08CLEANING
    • B08BCLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B1/00Cleaning by methods involving the use of tools
    • B08B1/10Cleaning by methods involving the use of tools characterised by the type of cleaning tool
    • B08B1/14Wipes; Absorbent members, e.g. swabs or sponges
    • B08B1/143Wipes
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B08CLEANING
    • B08BCLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B13/00Accessories or details of general applicability for machines or apparatus for cleaning
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16JPISTONS; CYLINDERS; SEALINGS
    • F16J15/00Sealings
    • F16J15/002Sealings comprising at least two sealings in succession
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16JPISTONS; CYLINDERS; SEALINGS
    • F16J15/00Sealings
    • F16J15/02Sealings between relatively-stationary surfaces
    • F16J15/06Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01FMEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)

Abstract

The invention provides a water level sensor for an automobile water tank, relates to the technical field of water level sensors, and solves the problem that the automatic cleaning of a probe of the water level sensor cannot be realized; the structure improvement and the matching can not realize the simultaneous sealing of a plurality of sealing structures, and the organic combination of the wiping water structure and the sealing structure can not be realized. A water level sensor for an automobile water tank comprises a water tank main body; install the sensor main part on the water tank main part, and still install clean structure on the water tank main part to install cable fixed knot on the water tank main part and construct. Because of the adhesion of cleaning cotton on clean seat, and when cleaning seat and cleaning cotton reciprocate under the fluctuation of water level cleaning cotton in proper order with clean piece and detection head contact to can realize detecting the cleanness of head, and can realize automatically that the crowded water of cleaning cotton when cleaning cotton contacts with clean piece.

Description

Water level sensor for automobile water tank
Technical Field
The invention belongs to the technical field of water level sensors, and particularly relates to a water level sensor for an automobile water tank.
Background
The automobile sensor is an input device of automobile computer system, it converts various working condition information in the running of automobile, such as speed, temperature of various media, engine operation condition, etc. into electric signal and transmits it to computer, so that the engine is in optimum working state, and the water level sensor is generally installed in the interior of automobile water tank.
As in application No.: the invention discloses a water level sensor for an automobile water tank, which comprises a water level sensor body, wherein a supporting rod is arranged on the water level sensor body, an installation plate is sleeved on the supporting rod, the upper end and the lower end of the two sides of the installation plate are elastically connected with the outer surface wall of the supporting rod through damping springs, and a first sleeve is sleeved on the supporting rod below the installation plate. According to the water level sensor, the second sleeve is arranged on the water level sensor, the wiping cotton is bonded in the second sleeve, the second sleeve is controlled to rotate through the driving motor, so that the wiping cotton and the electrode probe can continuously generate a relative sliding friction effect, attached scale on the electrode probe can be effectively removed through the friction effect, the sensing precision of the water level sensor is improved, and the vibration effect in different directions can be effectively absorbed through the arrangement of the four damping springs, so that the internal structure of the water level sensor is effectively protected, and the service life of the water level sensor is prolonged.
Similar to the water level sensor for the automobile radiator in the above application, the following disadvantages exist at present:
one is that a large amount of scale is attached to an electrode probe of the water level sensor, the sensing precision is directly reduced due to the scale, and the existing device cannot automatically clean the water level sensor probe in the using process; moreover, most of the existing devices are single sealing structures, and cannot realize simultaneous sealing of a plurality of sealing structures through structural improvement and matching, and cannot realize organic combination of wiping and wiping structures and sealing structures.
In view of the above, the conventional open mill for processing reclaimed rubber has the following defects:
one is that a large amount of scale is attached to an electrode probe of the water level sensor, the sensing precision is directly reduced due to the scale, and the existing device cannot automatically clean the water level sensor probe in the using process; moreover, most of the existing devices are single sealing structures, and cannot realize simultaneous sealing of a plurality of sealing structures through structural improvement and matching, and cannot realize organic combination of wiping and wiping structures and sealing structures.
Therefore, in view of the above, research and improvement are made for the existing structure and defects, and a water level sensor for an automobile water tank is provided, so as to achieve the purpose of higher practical value.
Disclosure of Invention
In order to solve the technical problems, the invention provides a water level sensor for an automobile water tank, which aims to solve the problems that in the prior art, a large amount of scale is attached to an electrode probe of the water level sensor, the sensing precision is directly reduced due to the scale, and the probe of the water level sensor cannot be automatically cleaned in the using process of the prior art; moreover, most of the existing devices are single sealing structures, and cannot realize simultaneous sealing of a plurality of sealing structures through structural improvement and matching, and cannot realize the problem of organic combination of wiping and wiping structures and sealing structures.
The invention relates to a water level sensor for an automobile water tank, which is realized by the following specific technical means:
a water level sensor for an automobile water tank comprises a water tank main body; the water tank main body is provided with a sensor main body, a cleaning structure and a cable fixing structure; the cleaning structure comprises cleaning cotton, the cleaning cotton is adhered to the cleaning seat, and the cleaning cotton is sequentially contacted with the cleaning block and the detection head when the cleaning seat and the cleaning cotton move up and down under the fluctuation of the water level.
Further, the water tank main body comprises a threaded hole and a threaded groove, the right end face of the water tank main body is provided with the threaded hole, and the right end face of the water tank main body is also provided with the threaded groove; the threaded hole is communicated with the inside of the water tank main body, and the threaded hole and the threaded groove are mutually overlapped.
Further, the sensor main body comprises a detection head and a sealing gasket B, the detection head is mounted on the sensor main body, and the sensor main body is in threaded connection with the water tank main body; the sensor body is sleeved with a sealing gasket B, and the sealing gasket B is in contact and abutting state with the thread groove when the sensor body is in thread fixation with the water tank body.
Further, the sensor main body further comprises a sealing gasket C, the sealing gasket C is sleeved on the sensor main body and contacts with the water tank main body when the sensor main body is fixed with the water tank main body in a threaded mode, and the sealing gasket C and the water tank main body jointly form an auxiliary sealing structure of the sensor main body.
Furthermore, the water tank main body also comprises a baffle ring, the baffle ring is of an annular structure, and the baffle ring is welded on the right end face of the water tank main body; the sensor main body also comprises a cable, and the cable is connected to the sensor main body; when the sensor main body is in threaded fixation with the water tank main body, the outer wall of the sensor main body is in contact with the inner wall of the retaining ring, and the retaining ring forms another auxiliary sealing structure of the sensor main body.
Furthermore, the water tank main body also comprises a cleaning block, the cleaning block is welded on the inner wall of the water tank main body, and a through hole for the sensor main body to penetrate through is formed in the cleaning block; the sensor main part still includes sealed A that fills up, sealed A cup joints in the sensor main part, and fills up A left end face and the contact of clean piece right-hand member face when sensor main part and water tank main part thread tightening to sealed A and clean piece have constituteed the third seal structure of sensor main part jointly.
Furthermore, the cleaning structure comprises a sliding seat, a sliding rod A, a floating block and a cleaning seat, wherein the sliding seat is welded on the inner wall of the water tank main body, and the sliding seat is connected with the sliding rod A in a sliding manner; the head end of the sliding rod A is fixedly connected with a cleaning seat, the tail end of the sliding rod A is fixedly connected with the floating block, and the floating block is in contact with the water surface in the water tank main body.
Furthermore, the cable fixing structure comprises a rectangular seat, sliding rods B and a pressing plate, wherein the rectangular seat is welded on the water tank main body, and the rectangular seat is welded with the two sliding rods B; the two sliding rods B are connected with a pressing plate in a sliding manner; the cable conductor passes through the pressing plate, and the cable conductor after passing through the pressing plate is S-shaped.
Compared with the prior art, the invention has the following beneficial effects:
when the water tank is used, after the sensor main body is installed, firstly, the sealing gasket B is sleeved on the sensor main body, and when the sensor main body is fixed with the water tank main body through threads, the sealing gasket B is in a contact and tight abutting state with the thread groove; secondly, the sealing gasket C is sleeved on the sensor main body and is contacted with the water tank main body when the sensor main body and the water tank main body are fixed in a threaded manner, and the sealing gasket C and the water tank main body jointly form an auxiliary sealing structure of the sensor main body; thirdly, when the sensor main body and the water tank main body are fixed in a threaded manner, the outer wall of the sensor main body is in contact with the inner wall of the retaining ring, and the retaining ring forms another auxiliary sealing structure of the sensor main body; fourthly, the sealing gasket A is sleeved on the sensor main body, and when the sensor main body and the water tank main body are fixed in a threaded manner, the left end face of the sealing gasket A is in contact with the right end face of the cleaning block, and the sealing gasket A and the cleaning block jointly form a third sealing structure of the sensor main body;
during use, firstly, the head end of the sliding rod A is fixedly connected with a cleaning seat, the tail end of the sliding rod A is fixedly connected with the floating block, and the floating block is contacted with the water surface in the water tank main body; secondly, the cleaning cotton is adhered to the cleaning seat, and when the cleaning seat and the cleaning cotton move up and down under the fluctuation of the water level, the cleaning cotton is contacted with the cleaning block and the detection head in sequence, so that the cleaning of the detection head can be realized, and when the cleaning cotton is contacted with the cleaning block, the wringing of the cleaning cotton can be automatically realized; thirdly, because of the cable conductor passes the clamp plate, and the cable conductor after passing the clamp plate is S-shaped to the clamp plate can realize automatically that the cable conductor compresses tightly fixedly when dragging the cable conductor.
Drawings
Fig. 1 is a schematic axial view of the present invention.
Fig. 2 is an enlarged schematic view of fig. 1 at a.
Fig. 3 is a schematic cross-sectional structure of the present invention.
Fig. 4 is an enlarged view of the structure of fig. 3B according to the present invention.
Fig. 5 is a schematic diagram of the split structure of fig. 3 of the present invention.
Fig. 6 is an enlarged view of the structure of fig. 5C according to the present invention.
Fig. 7 is a schematic diagram of the structure D of fig. 5 according to the present invention.
Fig. 8 is a front view showing an enlarged structure of the cable fixing structure of the present invention.
In the drawings, the corresponding relationship between the component names and the reference numbers is as follows:
1. a water tank main body; 101. a threaded hole; 102. a thread groove; 103. a baffle ring; 104. a cleaning block; 2. a sensor body; 201. a detection head; 202. a gasket A; 203. a gasket B; 204. a gasket C; 205. a cable wire; 3. cleaning the structure; 301. a sliding seat; 302. a slide bar A; 303. a floating block; 304. cleaning the seat; 305. cleaning cotton; 4. a cable fixing structure; 401. a rectangular base; 402. a slide bar B; 403. and (7) pressing a plate.
Detailed Description
The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
As shown in figures 1 to 8:
the invention provides a water level sensor for an automobile water tank, which comprises a water tank main body 1; a sensor main body 2 is arranged on the water tank main body 1, a cleaning structure 3 is also arranged on the water tank main body 1, and a cable fixing structure 4 is arranged on the water tank main body 1; referring to fig. 5, the cleaning structure 3 includes cleaning cotton 305, the cleaning cotton 305 is adhered to the cleaning base 304, and the cleaning cotton 305 is sequentially contacted with the cleaning block 104 and the detection head 201 as the cleaning base 304 and the cleaning cotton 305 move up and down under the fluctuation of the water level, so that the cleaning of the detection head 201 can be achieved, and the wringing of the cleaning cotton 305 can be automatically achieved when the cleaning cotton 305 is contacted with the cleaning block 104.
Referring to fig. 5 and 6, the cistern body 1 includes a threaded hole 101 and a threaded groove 102, the right end surface of the cistern body 1 is provided with a threaded hole 101, and the right end surface of the cistern body 1 is also provided with a threaded groove 102; the screw hole 101 communicates with the inside of the tank main body 1, and the screw hole 101 and the screw groove 102 overlap each other.
Referring to fig. 3 and 4, the sensor body 2 includes a detection head 201 and a gasket B203, the detection head 201 is mounted on the sensor body 2, and the sensor body 2 is screwed to the tank body 1; the sensor body 2 is sleeved with a gasket B203, and when the sensor body 2 is screwed with the water tank body 1, the gasket B203 is in contact and abutting state with the thread groove 102.
Referring to fig. 3 and 4, the sensor body 2 further includes a gasket C204, the gasket C204 is sleeved on the sensor body 2, and the gasket C204 is in contact with the water tank body 1 when the sensor body 2 is screwed with the water tank body 1, and the gasket C204 and the water tank body 1 together form an auxiliary sealing structure of the sensor body 2.
Referring to fig. 3 and 4, the tank body 1 further includes a baffle ring 103, the baffle ring 103 is of an annular structure, and the baffle ring 103 is welded on the right end face of the tank body 1; the sensor main body 2 further comprises a cable 205, and the cable 205 is connected to the sensor main body 2; when the sensor body 2 is fixed with the water tank body 1 through threads, the outer wall of the sensor body 2 is in contact with the inner wall of the retaining ring 103, and the retaining ring 103 forms another auxiliary sealing structure of the sensor body 2.
Referring to fig. 3 and 4, the tank body 1 further includes a cleaning block 104, the cleaning block 104 is welded on the inner wall of the tank body 1, and the cleaning block 104 is provided with a through hole for the sensor body 2 to pass through; the sensor body 2 further comprises a sealing gasket A202, the sealing gasket A202 is sleeved on the sensor body 2, the left end face of the sealing gasket A202 is in contact with the right end face of the cleaning block 104 when the sensor body 2 and the water tank body 1 are fixed in a threaded mode, and the sealing gasket A202 and the cleaning block 104 jointly form a third sealing structure of the sensor body 2.
Referring to fig. 5, the cleaning structure 3 includes a sliding seat 301, a sliding rod a302, a floating block 303, and a cleaning seat 304, the sliding seat 301 is welded on the inner wall of the tank body 1, and the sliding seat 301 is slidably connected with the sliding rod a 302; the head end of the sliding rod A302 is fixedly connected with a cleaning seat 304, the tail end of the sliding rod A302 is fixedly connected with a floating block 303, and the floating block 303 is contacted with the water surface in the water tank main body 1.
Referring to fig. 8, the cable fixing structure 4 includes a rectangular seat 401, a sliding rod B402, and a pressing plate 403, the rectangular seat 401 is welded to the tank main body 1, and two sliding rods B402 are welded to the rectangular seat 401; a pressing plate 403 is connected on the two sliding rods B402 in a sliding way; cable wires 205 pass through pressure plate 403, and cable wires 205 passing through pressure plate 403 are S-shaped, so that pressure plate 403 can automatically realize the compression fixation of cable wires 205 when cable wires 205 are pulled.
The specific use mode and function of the embodiment are as follows:
when the water tank is used, after the sensor body 2 is installed, firstly, the sealing gasket B203 is sleeved on the sensor body 2, and when the sensor body 2 is fixed with the water tank body 1 in a threaded manner, the sealing gasket B203 is in a contact and tight abutting state with the threaded groove 102; secondly, the sealing gasket C204 is sleeved on the sensor body 2, and when the sensor body 2 and the water tank body 1 are fixed in a threaded manner, the sealing gasket C204 is in contact with the water tank body 1, and the sealing gasket C204 and the water tank body 1 jointly form an auxiliary sealing structure of the sensor body 2; thirdly, when the sensor body 2 is fixed with the water tank body 1 through threads, the outer wall of the sensor body 2 is in contact with the inner wall of the baffle ring 103, and the baffle ring 103 forms another auxiliary sealing structure of the sensor body 2; fourthly, the sealing gasket A202 is sleeved on the sensor body 2, and when the sensor body 2 and the water tank body 1 are fixed in a threaded manner, the left end face of the sealing gasket A202 is in contact with the right end face of the cleaning block 104, and the sealing gasket A202 and the cleaning block 104 jointly form a third sealing structure of the sensor body 2;
during use, firstly, the head end of the sliding rod A302 is fixedly connected with a cleaning seat 304, the tail end of the sliding rod A302 is fixedly connected with the floating block 303, and the floating block 303 is contacted with the water surface in the water tank main body 1; secondly, since the cleaning cotton 305 is adhered to the cleaning seat 304 and the cleaning cotton 305 is sequentially contacted with the cleaning block 104 and the detection head 201 when the cleaning seat 304 and the cleaning cotton 305 move up and down under the fluctuation of the water level, the cleaning of the detection head 201 can be realized, and the wringing of the cleaning cotton 305 can be automatically realized when the cleaning cotton 305 is contacted with the cleaning block 104; thirdly, as the cable wires 205 pass through the pressing plate 403 and the cable wires 205 passing through the pressing plate 403 are S-shaped, the pressing plate 403 can automatically realize the pressing and fixing of the cable wires 205 when the cable wires 205 are pulled.
The embodiments of the present invention have been presented for purposes of illustration and description, and are not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiment was chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.

Claims (8)

1. The utility model provides a water level sensor for radiator which characterized in that: comprises a water tank main body (1); a sensor main body (2) is installed on the water tank main body (1), a cleaning structure (3) is also installed on the water tank main body (1), and a cable fixing structure (4) is installed on the water tank main body (1); the cleaning structure (3) comprises cleaning cotton (305), the cleaning cotton (305) is adhered on the cleaning seat (304), and the cleaning cotton (305) is contacted with the cleaning block (104) and the detection head (201) in sequence when the cleaning seat (304) and the cleaning cotton (305) move up and down under the fluctuation of the water level.
2. A water level sensor for a radiator of an automobile according to claim 1, wherein: the water tank main body (1) comprises a threaded hole (101) and a threaded groove (102), the right end face of the water tank main body (1) is provided with the threaded hole (101), and the right end face of the water tank main body (1) is also provided with the threaded groove (102); the threaded hole (101) is communicated with the inside of the water tank main body (1), and the threaded hole (101) and the threaded groove (102) are mutually overlapped.
3. A water level sensor for a radiator of an automobile according to claim 1, wherein: the sensor main body (2) comprises a detection head (201) and a sealing gasket B (203), the detection head (201) is installed on the sensor main body (2), and the sensor main body (2) is in threaded connection with the water tank main body (1); the sensor main body (2) is sleeved with a sealing gasket B (203), and the sealing gasket B (203) is in a contact and abutting state with the thread groove (102) when the sensor main body (2) is fixed with the water tank main body (1) in a thread mode.
4. A water level sensor for a radiator of an automobile according to claim 1, wherein: the sensor main body (2) further comprises a sealing gasket C (204), the sealing gasket C (204) is sleeved on the sensor main body (2), the sealing gasket C (204) is in contact with the water tank main body (1) when the sensor main body (2) is in threaded fixation with the water tank main body (1), and the sealing gasket C (204) and the water tank main body (1) jointly form an auxiliary sealing structure of the sensor main body (2).
5. A water level sensor for a radiator of an automobile according to claim 1, wherein: the water tank main body (1) further comprises a baffle ring (103), the baffle ring (103) is of an annular structure, and the baffle ring (103) is welded on the right end face of the water tank main body (1); the sensor main body (2) further comprises a cable (205), and the cable (205) is connected to the sensor main body (2); when sensor main part (2) and water tank main part (1) threaded fixation sensor main part (2) outer wall and fender ring (103) inner wall contact, and keep off ring (103) and constitute another supplementary seal structure of sensor main part (2).
6. A water level sensor for a radiator of an automobile according to claim 1, wherein: the water tank main body (1) further comprises a cleaning block (104), the cleaning block (104) is welded on the inner wall of the water tank main body (1), and a through hole for the sensor main body (2) to penetrate through is formed in the cleaning block (104); the sensor main body (2) further comprises a sealing gasket A (202), the sealing gasket A (202) is sleeved on the sensor main body (2), the left end face of the sealing gasket A (202) is in contact with the right end face of the cleaning block (104) when the sensor main body (2) and the water tank main body (1) are fixed in a threaded mode, and the sealing gasket A (202) and the cleaning block (104) jointly form a third sealing structure of the sensor main body (2).
7. A water level sensor for a radiator of an automobile according to claim 1, wherein: the cleaning structure (3) comprises a sliding seat (301), a sliding rod A (302), a floating block (303) and a cleaning seat (304), wherein the sliding seat (301) is welded on the inner wall of the water tank main body (1), and the sliding seat (301) is connected with the sliding rod A (302) in a sliding manner; the water tank is characterized in that the head end of the sliding rod A (302) is fixedly connected with a cleaning seat (304), the tail end of the sliding rod A (302) is fixedly connected with the floating block (303), and the floating block (303) is in contact with the water surface in the water tank main body (1).
8. A water level sensor for a radiator of an automobile according to claim 1, wherein: the cable fixing structure (4) comprises a rectangular seat (401), sliding rods B (402) and a pressing plate (403), the rectangular seat (401) is welded on the water tank main body (1), and the rectangular seat (401) is welded with the two sliding rods B (402); a pressing plate (403) is connected on the two sliding rods B (402) in a sliding way; the cable wires (205) penetrate through the pressing plate (403), and the cable wires (205) penetrating through the pressing plate (403) are S-shaped.
CN202010888488.1A 2020-08-28 2020-08-28 Water level sensor for automobile water tank Withdrawn CN112090796A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010888488.1A CN112090796A (en) 2020-08-28 2020-08-28 Water level sensor for automobile water tank

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010888488.1A CN112090796A (en) 2020-08-28 2020-08-28 Water level sensor for automobile water tank

Publications (1)

Publication Number Publication Date
CN112090796A true CN112090796A (en) 2020-12-18

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Application Number Title Priority Date Filing Date
CN202010888488.1A Withdrawn CN112090796A (en) 2020-08-28 2020-08-28 Water level sensor for automobile water tank

Country Status (1)

Country Link
CN (1) CN112090796A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113000437A (en) * 2021-01-27 2021-06-22 罗志球 Bridge crack measuring device for municipal bridge engineering

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113000437A (en) * 2021-01-27 2021-06-22 罗志球 Bridge crack measuring device for municipal bridge engineering

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