CN215573213U - Wide-range liquid level sensor - Google Patents
Wide-range liquid level sensor Download PDFInfo
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- CN215573213U CN215573213U CN202121252592.8U CN202121252592U CN215573213U CN 215573213 U CN215573213 U CN 215573213U CN 202121252592 U CN202121252592 U CN 202121252592U CN 215573213 U CN215573213 U CN 215573213U
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Abstract
The utility model relates to a wide-range liquid level sensor. The wide range liquid level sensor includes a housing, a body assembly, and a watertight connector with a watertight cable mounted thereto. The shell is provided with a pressure leading end and a lead end. The pressure guiding end is provided with a pressure guiding opening. The lead end is provided with a lead port. The body assembly comprises a pressure guide seat, a fixed support and a sensitive core body. The pressure guiding seat is arranged at the pressure guiding end to cover the pressure guiding opening. The sensitive core body comprises an elastomer made of stainless steel and a nano-film strain grid deposited on the elastomer. The elastic body is arranged at one end of the pressure guiding seat in the shell, and a pressure guiding space is formed between the elastic body and the end surface of one end of the pressure guiding seat. The pressure guiding seat is provided with a pressure guiding through hole communicated with the pressure guiding space. The watertight connector is arranged at the lead end and is connected with the lead port in a sealing way. The watertight connector is in electrical connection with the nanofilm strain gate. Therefore, the wide-range liquid level sensor has high sealing reliability, high long-term stability and long service life.
Description
Technical Field
The utility model relates to the technical field of sensor manufacturing, in particular to a wide-range liquid level sensor.
Background
The large-range liquid level sensor serving as a pressure sensor for measuring the liquid level depth can be applied to deep sea operation projects, such as deep sea instrument equipment, deep sea mining equipment, underwater remote control robots, submarines, torpedo launching tubes, ship-towed sonar and the like, and can also be applied to deep mine liquid depth measurement.
The traditional wide-range liquid level sensor mostly adopts a process of diffusing a silicon core body or bonding a strain gauge core body, the core body process is complex, the size is too large, the wide-range liquid level sensor has the defects of poor sealing, creep deformation, hysteresis, easy aging and the like under wide-range products and complex working conditions, and the problems of poor long-term stability and short service life of the products are caused.
SUMMERY OF THE UTILITY MODEL
Therefore, it is necessary to provide a wide-range liquid level sensor with good long-term stability for solving the problems of poor long-term stability and short service life of the conventional wide-range liquid level sensor.
A wide-range liquid level sensor comprises a shell, a body assembly and a watertight connector provided with a watertight cable;
the shell is provided with a pressure leading end and a lead end; the pressure leading end is provided with a pressure leading port; the lead end is provided with a lead port;
the body assembly comprises a pressure guide seat, a fixed support and a sensitive core body; the pressure guide seat is arranged at the pressure guide end to cover the pressure guide port;
the sensitive core body comprises an elastomer made of stainless steel and a nano-film strain grid deposited on the elastomer; the elastic body is arranged at one end of the pressure guide seat positioned in the shell, and a pressure guide space is formed between the elastic body and the end surface of one end of the pressure guide seat; a pressure guiding through hole communicated with the pressure guiding space is formed on the pressure guiding seat;
the watertight connector is arranged at the lead end and is in sealed connection with the lead port; the watertight connector is in electrical connection with the nanofilm strain gate.
In some of these embodiments, the housing comprises a cylinder and a watertight connection socket; the two ends of the cylinder body are respectively provided with a lead port and a pressure port; the watertight connecting seat is fixedly connected with one end of the cylinder body, which is provided with the lead port, and seals the lead port; the watertight connecting seat is provided with a mounting hole communicated with the lead port;
the watertight connector comprises a first connecting part, a limiting part and a second connecting part which are connected in sequence; the first connecting part is hermetically arranged in the mounting hole in a penetrating way and is in gate connection with the nano film strain; the limiting part is in sealing contact with the surface of the watertight connecting seat; the watertight cable is connected with the second connecting part in a sealing mode.
In some of these embodiments, further comprising a seal ring; the sealing ring is clamped between the end part of one end of the limiting part facing the watertight connecting seat and the surface of the watertight connecting seat; the seal ring is arranged along the circumferential direction of the first connecting part.
In some embodiments, the pressure guiding through hole comprises a large diameter section, a variable diameter section and a small diameter section; the large-diameter section, the variable-diameter section and the small-diameter section are sequentially communicated along the direction of the pressure leading end pointing to the lead end; the inner diameter of the large-diameter section is larger than that of the small-diameter section; the inner diameter of the variable diameter section is gradually reduced along the direction of the large diameter section pointing to the small diameter section.
In some embodiments, the pressure guide seat comprises a pressure guide nozzle with the pressure guide through hole and a cylindrical fixing support; the pressure guide nozzle comprises a fixing part, a sealing part and an installation part which are connected in sequence; the fixing part is fixedly connected with the pressure leading end; the fixed support is arranged on the sealing part in a sealing manner and is connected with the fixed part; the mounting part is positioned in the fixed bracket; the elastic piece is arranged on the mounting part and is positioned in the fixed bracket;
the body assembly also comprises an adapter plate in an annular plate-shaped structure; the adapter plate is arranged at one end of the fixing support, which is far away from the fixing part, and is in gate connection with the nano film strain; the adapter plate is electrically connected with the watertight connector.
In some embodiments, the elastic member includes an elastic top plate and an elastic side plate arranged along the circumference of the elastic top plate; the elastic top plate is connected with the elastic side plate to form a pressure storage cavity in an enclosing manner;
the mounting part and the inner wall of the fixed bracket are arranged at intervals; the elastic piece is sleeved on the mounting part in an interference fit manner; the inner wall of the pressure storage cavity and the axial end face of the mounting part are arranged at intervals to form the pressure guiding space in a surrounding mode.
In some embodiments, the outer wall of the sealing part is circumferentially provided with a limit groove; the inner wall of the fixed support is provided with a hook capable of generating elastic deformation; the hook is hooked in the limiting groove to limit the axial position of the fixed support.
In some of these embodiments, further comprising a conditioning plate assembly housed within the housing; the conditioning plate assembly comprises a signal conditioning plate and a first conductive column electrically connected with the signal conditioning plate; the position of the adapter plate corresponding to the first conductive column is provided with a conductive hole; one end, far away from the signal conditioning plate, of the first conductive column is inserted into the conductive hole and is electrically connected with the inner wall of the conductive hole; one end of the watertight connector, which faces the signal conditioning plate, is provided with a second conductive column; a connecting hole is formed in the position, corresponding to the second conductive column, of the signal conditioning board; one end, far away from the watertight connector, of the second conductive column is inserted into the connecting hole and is electrically connected with the inner wall of the connecting hole; and/or
An axial end face of one side of the fixing part, which faces the elastic part, is provided with an annular groove arranged along the circumferential direction of the sealing part; the bottom wall of the annular groove is provided with a limiting hole; one end of the fixed support, which is far away from the elastic piece, is provided with a limiting column; one end of the fixed support far away from the elastic piece is accommodated in the annular groove; the limiting column is inserted into the limiting hole.
In some of these embodiments, further comprising a filtration device; the filtering device is arranged at the bottom of the pressure guiding seat and is used for filtering liquid entering the pressure guiding through hole.
In some of these embodiments, the filtration device is a powder metallurgy microporous filter.
According to the wide-range liquid level sensor, in the body assembly, the nano film strain gate is deposited on the elastic body by using a nano film deposition technology, so that the stability of the sensitive core body can be improved, and the drift amount of the wide-range liquid level sensor is extremely small even under high pressure; the sensitive core has high stability and minimal zero temperature drift even at high operating temperatures. In addition, the elastic piece is made of stainless steel materials, so that the compatibility of the medium and the corrosion resistance can be improved, and the service life of the wide-range liquid level sensor can be prolonged. In addition, the watertight connector has the advantages of tensile strength, acid and alkali resistance, pressure resistance and the like, so that the wide-range liquid level sensor is used for long-time operation in deep sea or deep well environments, and the sealing performance of the wide-range liquid level sensor can meet the use requirement. Therefore, the wide-range liquid level sensor has high sealing reliability, high long-term stability and long service life.
Drawings
FIG. 1 is a schematic diagram of a wide range liquid level sensor in accordance with a preferred embodiment of the present invention;
FIG. 2 is a schematic structural view of a housing of the wide-range level sensor of FIG. 1;
FIG. 3 is a schematic structural view of a body assembly of the wide range liquid level sensor of FIG. 1;
FIG. 4 is a top view of the body assembly shown in FIG. 3;
FIG. 5 is a cross-sectional view A-A of the body assembly of FIG. 4;
FIG. 6 is a cross-sectional view B-B of the body assembly shown in FIG. 4;
FIG. 7 is a schematic diagram of the construction of a watertight connector in the wide-range level sensor of FIG. 1;
FIG. 8 is a schematic view of a pressure tap in the wide range level sensor of FIG. 1;
FIG. 9 is a schematic diagram of the configuration of the resilient member of the wide range liquid level sensor of FIG. 1.
Description of reference numerals: 10. a wide range liquid level sensor; 100. a housing; 110. a pressure leading end; 111. a pressure leading port; 120. a lead terminal; 121. a wire leading port; 130. a barrel; 140. a watertight connecting seat; 141. mounting holes; 200. a body assembly; 210. a pressure guide seat; 211. leading and pressing the through hole; 2111. a large diameter section; 2112. a diameter-changing section; 2113. a small diameter section; 212. a pressure guide nozzle; 2121. a fixed part; 2122. a sealing part; 2123. an installation part; 2124. a limiting groove; 2125. an annular groove; 2126. a limiting hole; 213. fixing a bracket; 2131. a limiting column; 2132. hooking; 220. a sensitive core; 221. an elastomer; 2211. an elastic top plate; 2212. an elastic side plate; 2213. a pressure storage cavity; 222. a metal wire; 230. a pressure-leading space; 240. an adapter plate; 241. a conductive via; 300. a watertight cable; 250. a seal member; 400. a watertight connector; 410. a first connection portion; 420. a limiting part; 421. sealing the groove; 430. a second connecting portion; 440. a second conductive post; 500. a seal ring; 600. a conditioning plate assembly; 610. a signal conditioning board; 620. a first conductive post; 700. a filtration device; 710. a filter member; 720. a screw.
Detailed Description
To facilitate an understanding of the utility model, the utility model will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
When an element is referred to as being "on" another element, it can be directly on the other element or intervening elements may also be present, unless otherwise specified. It will also be understood that when an element is referred to as being "between" two elements, it can be the only one between the two elements, or one or more intervening elements may also be present.
Where the terms "comprising," "having," and "including" are used herein, another element may be added unless an explicit limitation is used, such as "only," "consisting of … …," etc. Unless mentioned to the contrary, terms in the singular may include the plural and are not to be construed as being one in number.
Furthermore, the drawings are not 1: 1, and the relative dimensions of the various elements in the figures are drawn for illustration only and not necessarily to true scale.
FIG. 1 is a diagram of a wide range liquid level sensor in one embodiment of the present invention. For convenience of explanation, only portions related to the embodiments of the present invention are shown.
Referring to FIG. 1, a wide range liquid level sensor 10 in accordance with a preferred embodiment of the present invention includes a housing 100, a body assembly 200, and a watertight connector 400 with a watertight cable 300 mounted thereto.
Referring also to fig. 2, the housing 100 has a lead terminal 110 and a lead terminal 120. The pressure guiding end 110 is provided with a pressure guiding opening 111. The lead terminal 120 is provided with a lead opening 121. The housing 100 may be a casing structure with a shape of a long bar, a rectangle, or the like. Specifically, in the present embodiment, the casing 100 has a long cylindrical structure, and the lead terminal 110 and the lead terminal 120 are two ends of the casing 100 respectively.
Referring to fig. 3 to 6, the body assembly 200 includes a pressure-inducing seat 210 and a sensitive core 220. The pressure guide base 210 is mounted on the pressure guide end 110 to cover the pressure guide opening 111. Specifically, one end of the pressure guide seat 210 is located in the housing 100, and the other end passes through the pressure guide opening 111 and is fixedly connected with the edge of the pressure guide opening 111.
The sensitive core 220 includes an elastomer 221 made of stainless steel and a nano-thin film strain gauge (not shown) deposited on the elastomer 221. Wherein the nano-thin film strain gate is deposited on the elastomer 221 by a nano-thin film deposition technique. The elastic body 221 is mounted at one end of the pressure guide base 210 in the housing 100, and forms a pressure guide space 230 with an end surface of one end of the pressure guide base 210. The pressure guide holder 210 is formed with a pressure guide through hole 211 communicating with the pressure guide space 230. When the wide-range liquid level sensor 10 is placed in liquid, the liquid enters the pressure guiding space 230 through the pressure guiding hole, so that the pressure in the pressure guiding space 230 is increased, the elastic body 221 is elastically deformed under the action of the pressure, and at the moment, the nano-film strain gate deposited on the elastic body 221 acquires a liquid depth signal according to the deformation of the elastic body 221.
The watertight connector 400 is mounted to the lead terminal 120 and is hermetically connected to the lead port 121. The watertight connector 400 is in electrical connection with the nano-film strain gate. The watertight connector 400 (also called as a deepwater connector) has excellent strength, good tensile property, acid and alkali resistance and very high pressure resistance, and according to a pressure test, the working depth of the watertight connector 400 can reach 7000 m to 8500 m, so that even if the wide-range liquid level sensor 10 works in a deep sea or a deep well, the watertight connector 400 can still meet the sealing requirement, and the sealing reliability of the wide-range liquid level sensor 10 is greatly improved.
Moreover, the processing method of depositing the nano-film strain gate on the elastic body 221 by using the nano-film deposition process not only simplifies the processing process of the sensitive core 220 and reduces the volume of the sensitive core 220, but also enables the drift amount in the measurement process to be extremely small, and can keep high stability and extremely small zero-point temperature drift even at high working temperature, so that the wide-range liquid level sensor 10 has the advantage of a wide temperature zone, and the working temperature range of the hydraulic sensor is 40 ℃ below zero to 125 ℃ according to practice. Thus, the long-term stability of the wide-range level sensor 10 is greatly improved by the provision of the sensitive core 220 described above. It should be noted that, according to the pressure test, the wide-range level sensor 10 has a drift amount of less than or equal to ± 0.1% FS/year after 1000 ten thousand pressure cycles.
In addition, compared with the silicon elastomer 221 in the prior art, the material of the elastomer 221 is stainless steel, so that the deformation amount of the elastomer 221 can be improved, and the increase of the measuring range of the hydraulic sensor is facilitated. Moreover, the elastomer 221 is made of stainless steel, so that the elastomer 221 has good medium compatibility and strong corrosion performance, and the service life of the wide-range liquid level sensor 10 is prolonged.
Thus, the wide range level sensor 10 described above has high long term stability, high seal reliability, and a long service life.
Referring again to fig. 2, in some embodiments, the housing 100 includes a cylinder 130 and a watertight connector 140. The barrel 130 has a lead port 121 and a pressure port 111 at its two ends. The watertight connecting socket 140 is fixedly connected to one end of the cylinder 130 having the lead opening 121, and seals the lead opening 121. The watertight connecting socket 140 is opened with a mounting hole 141 communicating with the lead port 121. The mounting hole 141 may be a threaded hole, or may also be a light hole, a counter bore, or a hole with other structural forms.
Referring to fig. 7, the watertight connector 400 includes a first connecting portion 410, a limiting portion 420 and a second connecting portion 430 connected in sequence. The watertight connector 400 may be a splicing structure formed by sequentially connecting the first connection portion 410, the limiting portion 420, and the second connection portion 430, or may be an integral structure formed by casting, machining, and the like. The first connection portion 410 is hermetically disposed through the mounting hole 141 and electrically connected to the nano-film strain gate. The stopper 420 is in sealing contact with a surface of the watertight coupling socket 140. The watertight cable 300 is hermetically connected with the second connection portion 430. The watertight cable 300 may be sleeved on the second connection portion 430 or inserted into the second connection portion 430 to achieve electrical connection therebetween.
In the parts machining, the structural characteristics of the shell 100 are not suitable for integral machining, and the shell 100 is formed into the barrel 130 and the watertight connecting seat 140 respectively, so that the machining difficulty can be reduced, the machining precision can be improved, the material waste is less, and the machining cost is lower.
Moreover, the connection between the watertight connector 400 and the housing 100 is simply performed by inserting the second connection portion 430 into the mounting hole 141, which effectively simplifies the installation of the watertight connector 400.
Specifically, the mounting hole 141 is a threaded hole. The first connection portion 410 is a threaded rod. The first connection portion 410 is screwed into the mounting hole 141. In the practical application process, the watertight connector 400 can be mounted and dismounted only by screwing the watertight connector 400, so that the wide-range liquid level sensor 10 is convenient to use.
Referring again to fig. 1 and 7, further, in some embodiments, the wide range level sensor 10 further includes a gasket 500. The seal ring 500 is clamped between an end of the stopper 420 facing the water-tight connecting socket 140 and a surface of the water-tight connecting socket 140. The seal ring 500 is disposed along the circumferential direction of the first connection portion 410. Therefore, the sealing ring 500 is used for sealing the contact position between the watertight connecting seat 140 and the watertight connector 400, and the sealing ring 500 is arranged to be of an annular structure arranged along the circumferential direction of the first connecting portion 410, so that the probability that external liquid enters the shell 100 through the contact position between the watertight connector 400 and the watertight connecting seat 140 is reduced, and the sealing performance of the wide-range liquid level sensor 10 is greatly improved.
Specifically, the end surface of the limiting portion 420 facing one end of the watertight connecting seat 140 is provided with a sealing groove 421 disposed along the circumference of the first connecting portion 410. The sealing ring 500 is accommodated in the sealing groove 421, and is clamped between the inner wall of the sealing groove 421 and the surface of the watertight connecting seat 140. The sealing groove 421 is arranged to greatly facilitate the installation of the sealing ring 500, and the sealing groove 421 can also improve the installation accuracy of the sealing ring 500.
It is understood that in other embodiments, the sealing groove 421 may be formed on the watertight connecting socket 140, as long as the installation of the sealing ring 500 is facilitated.
Referring also to fig. 8, in some embodiments, the pressure guiding through hole 211 includes a large diameter section 2111, a variable diameter section 2112, and a small diameter section 2113. The large-diameter section 2111, the variable-diameter section 2112 and the small-diameter section 2113 are sequentially communicated in a direction in which the pressure leading end 110 points to the lead end 120. The large-diameter section 2111 has an inner diameter larger than that of the small-diameter section 2113. The inner diameter of the variable diameter section 2112 gradually decreases in a direction in which the large diameter section 2111 is directed to the small diameter section 2113.
In the actual use process, the pressure leading end 110 and the pressure leading end 120 are respectively the lower end and the upper end of the casing 100, so the large diameter section 2111, the variable diameter section 2112 and the small diameter section 2113 are arranged from bottom to top, and the pressure leading through hole 211 is a through hole structure with a large bottom and a small top.
In the working process of the wide-range liquid level sensor 10, in the process that the external liquid enters the pressure guiding space 230 through the pressure guiding through hole 211, the diameter of the pressure guiding through hole 211 is changed, so that the small-diameter section 2113 amplifies the pressure of the entering liquid, the elastic body 221 is easily elastically deformed, the improvement of the measurement sensitivity of the sensitive core body 220 is facilitated, and the sensitivity of the wide-range liquid level sensor 10 is higher.
In addition, the arrangement of the variable-diameter section 2112 enables the liquid in the large-diameter section 2111 to smoothly flow into the small-diameter section 2113, reduces the pressure loss of the liquid when flowing in the pressure guiding through hole 211, and ensures that the wide-range liquid level sensor 10 has very high measurement sensitivity.
Referring to fig. 5, 6 and 8 again, in some embodiments, the pressure guide base 210 includes a pressure guide nozzle 212 having a pressure guide through hole 211 and a cylindrical fixing bracket 213. The pressure nozzle 212 includes a fixing portion 2121, a sealing portion 2122, and an installation portion 2123 connected in this order. Specifically, the pressure nozzle 212 is an integral structure. The fixing portion 2121 is fixedly connected to the pressure guiding end 110. The fixing bracket 213 is hermetically fitted to the sealing portion 2122 and connected to the fixing portion 2121. The mounting portion 2123 is located in the fixed bracket 213. The elastic member is mounted to the mounting portion 2123 and is positioned within the fixing bracket 213.
The body assembly 200 further includes an adapter plate 240 in an annular plate-like configuration. The interposer 240 is mounted on an end of the fixing support 213 away from the fixing portion 2121, and electrically connected to the nano-film strain gate. The adaptor plate 240 is electrically connected to the watertight connector 400. The nano thin film strain gate may be electrically connected to the interposer 240 through the metal wire 222 and the soft metal sheet, or may be electrically connected to the interposer 240 through another rigid structure with conductive performance. Specifically, in the present embodiment, the nano-thin film strained gate is electrically connected to the interposer 240 through a metal wire.
Therefore, the adapter plate 240 is used for facilitating the electrical connection between the nano-film strain gauge and the watertight connector 400, so that when the nano-film strain gauge is deposited on the elastic body 221, only whether the strain signal of the elastic body 221 is convenient to collect needs to be considered, and whether the nano-film strain gauge is electrically connected with other components does not need to be considered, and therefore the arrangement of the adapter plate 240 enables the sensitive core 220 to be more simply and conveniently processed.
Referring to fig. 9, in some embodiments, the elastic member includes an elastic top plate 2211 and an elastic side plate 2212 disposed along the circumference of the elastic top plate 2211. The elastic top plate 2211 is connected with the elastic side plate 2212 to form a pressure storage cavity 2213. The elastic body 221 may be an integral structure, or may be a spliced structure formed by splicing the elastic side plate 2212 and the elastic top plate 2211 by welding or other processes.
The elastic element is sleeved on the mounting part 2123 in an interference fit manner. The inner wall of the pressure storage chamber 2213 is spaced from the axial end surface of the mounting portion 2123 to enclose the pressure introduction space 230. Therefore, when the elastic element needs to be installed on the pressure guide nozzle 212, the elastic element only needs to be sleeved on the installation part 2123, and interference fit between the elastic element and the installation part is ensured, so that installation of the elastic element is greatly simplified. Moreover, the elastic member is provided with the elastic top plate 2211 and the elastic side plate 2212, so that the deformable area of the elastic member is effectively increased, and the range of the sensor is favorably improved.
Referring to fig. 5 again, in some embodiments, the outer wall of the sealing portion 2122 is circumferentially provided with a limiting groove 2124. The inner wall of the fixing bracket 213 is formed with a hook 2132 which can be elastically deformed. The hook 2132 is hooked in the limiting groove 2124 to limit the axial position of the fixing bracket 213. In the installation process of the fixing bracket 213, only a downward pressure needs to be applied to the fixing bracket 213, and under the action of the downward pressure, the hook 2132 is elastically deformed to hook into the limiting groove 2124, so that the hook 2132 with elastic deformation performance is provided, and the installation of the fixing bracket 213 is facilitated. In addition, the hooks 2132 are hooked in the limiting grooves 2124, so that the axial position of the fixing support 213 can be limited, the probability of looseness of the fixing support 213 under the upward liquid pressure is reduced, and the structural stability of the body assembly 200 is effectively improved.
Referring again to FIG. 1, further, in some embodiments, the wide range liquid level sensor 10 further includes a conditioning plate assembly 600 housed within the housing 100. The conditioning board assembly 600 includes a signal conditioning board 610 and a first conductive post 620 electrically connected to the signal conditioning board 610.
The interposer 240 is provided with a conductive hole 241 at a position corresponding to the first conductive pillar 620. One end of the first conductive pillar 620, which is far away from the signal conditioning board 610, is inserted into the conductive hole 241 and electrically connected to the inner wall of the conductive hole 241.
One end of the watertight connector 400 facing the signal conditioning board 610 is provided with a second conductive post 440. Specifically, the second conductive pillar 440 is disposed at one end of the first connecting portion 410 away from the limiting portion 420. The signal conditioning board 610 has a connection hole (not shown) at a position corresponding to the second conductive pillar 440. One end of the second conductive post 440, which is away from the watertight connector 400, is inserted into the connection hole and electrically connected with the inner wall of the connection hole.
Therefore, the watertight connector 400 is electrically connected with the nano-film strain grid through the signal conditioning plate 610, and the signal conditioning plate 610 can amplify, filter and the like signals of liquid level depth information acquired by the nano-film strain grid, so as to improve the measurement accuracy of the wide-range liquid level sensor 10.
In the processing process of the wide-range liquid level sensor 10, the first connecting portion 410 is inserted into the mounting hole 141, and the second conductive post 440 is inserted into the connecting hole, so that the watertight connector 400 can be mounted on the housing 100, and the signal conditioning board 610 can be electrically connected; the signal conditioning board 610 is accommodated in the housing 100, and the first guide post is inserted into the conductive hole 241, so that the signal conditioning board 610 and the interposer 240 can be electrically connected, and thus the electrical connection between the signal conditioning board 610 and the nano-film strain gate is more convenient. Therefore, the first conductive pillar 620 and the second conductive pillar 440 are disposed, so that the wide-range liquid level sensor 10 can be more easily processed.
Referring to fig. 5 and 8 again, in some embodiments, an axial end surface of the fixing portion 2121 facing the elastic element is provided with an annular groove 2125 disposed along a circumferential direction of the limiting portion 420. The bottom wall of the annular groove 2125 is provided with a limiting hole 2126. One end of the fixing bracket 213 departing from the elastic member is provided with a limiting post 2131. The end of the fixing bracket 213 remote from the resilient member is received in the annular groove 2125. The stopper pin 2131 is inserted into the stopper hole 2126.
Due to the arrangement of the annular groove 2125, the time for alignment during installation of the fixed support 213 is saved, and the processing efficiency and the processing precision of the wide-range liquid level sensor 10 are improved. In addition, the limiting column 2131 is matched with the limiting hole 2126 to limit the circumferential installation position of the fixing support 213, which is beneficial to improving the installation accuracy of the adapter plate 240, so that the processing accuracy of the wide-range liquid level sensor 10 can be further improved.
Referring again to FIG. 1, in some embodiments, the wide range level sensor 10 further includes a filter assembly 700. The filtering device 700 is installed at the bottom of the pressure guide base 210 and is used for filtering the liquid entering the pressure guide through hole 211. Thus, the filter device 700 can prolong the service life of the wide range liquid level sensor 10 and further improve the long-term stability of the wide range liquid level sensor 10.
Further, in some embodiments, the filter device 700 is a powder metallurgy microporous filter. The powder metallurgy microporous filter has a large filtering surface and a plurality of threaded holes, and is not easy to block, so that the filtering device 700 is set as the powder metallurgy microporous filter, the filtering effect of the filtering device 700 is better, the service life of the wide-range liquid level sensor 10 is further prolonged, and the long-term stability of the wide-range liquid level sensor 10 is further improved.
Further, in some embodiments, the inner wall of the pressure introduction through hole 211 at the end away from the elastic member is formed with an internal thread. The filter assembly 700 includes a filter 710 and a screw 720 disposed on the filter 710. The screw 720 is inserted into and screwed into the pressure guiding through hole 211 to detachably connect the filtering device 700 and the pressure guiding seat 210.
Therefore, in the process of processing and using, the filter device 700 can be disassembled and assembled with the pressure guide seat 210 only by screwing the filter device 700, so that the filter device 700 is more convenient to disassemble and assemble.
In other embodiments, the filter device 700 can be detachably connected to the pressure-inducing seat 210 by a sealing and fastening method.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A wide-range liquid level sensor is characterized by comprising a shell, a body assembly and a watertight connector provided with a watertight cable;
the shell is provided with a pressure leading end and a lead end; the pressure leading end is provided with a pressure leading port; the lead end is provided with a lead port;
the body assembly comprises a pressure guide seat, a fixed support and a sensitive core body; the pressure guide seat is arranged at the pressure guide end to cover the pressure guide port;
the sensitive core body comprises an elastomer made of stainless steel and a nano-film strain grid deposited on the elastomer; the elastic body is arranged at one end of the pressure guide seat positioned in the shell, and a pressure guide space is formed between the elastic body and the end surface of one end of the pressure guide seat; a pressure guiding through hole communicated with the pressure guiding space is formed on the pressure guiding seat;
the watertight connector is arranged at the lead end and is in sealed connection with the lead port; the watertight connector is in electrical connection with the nanofilm strain gate.
2. The wide range liquid level sensor of claim 1, wherein the housing comprises a cylinder and a watertight connection socket; the two ends of the cylinder body are respectively provided with a lead port and a pressure port; the watertight connecting seat is fixedly connected with one end of the cylinder body, which is provided with the lead port, and seals the lead port; the watertight connecting seat is provided with a mounting hole communicated with the lead port;
the watertight connector comprises a first connecting part, a limiting part and a second connecting part which are connected in sequence; the first connecting part is hermetically arranged in the mounting hole in a penetrating way and is in gate connection with the nano film strain; the limiting part is in sealing contact with the surface of the watertight connecting seat; the watertight cable is connected with the second connecting part in a sealing mode.
3. The wide range liquid level sensor of claim 2, further comprising a sealing ring; the sealing ring is clamped between the end part of one end of the limiting part facing the watertight connecting seat and the surface of the watertight connecting seat; the seal ring is arranged along the circumferential direction of the first connecting part.
4. The wide range liquid level sensor of claim 1, wherein the pressure inducing through-hole comprises a large diameter section, a variable diameter section, and a small diameter section; the large-diameter section, the variable-diameter section and the small-diameter section are sequentially communicated along the direction of the pressure leading end pointing to the lead end; the inner diameter of the large-diameter section is larger than that of the small-diameter section; the inner diameter of the variable diameter section is gradually reduced along the direction of the large diameter section pointing to the small diameter section.
5. The wide range liquid level sensor according to claim 1, wherein the pressure-inducing seat comprises a pressure-inducing nozzle having the pressure-inducing through hole and a cylindrical fixing bracket; the pressure guide nozzle comprises a fixing part, a sealing part and an installation part which are connected in sequence; the fixing part is fixedly connected with the pressure leading end; the fixed support is arranged on the sealing part in a sealing manner and is connected with the fixed part; the mounting part is positioned in the fixed bracket; the elastic piece is arranged on the mounting part and is positioned in the fixed bracket;
the body assembly also comprises an adapter plate in an annular plate-shaped structure; the adapter plate is arranged at one end of the fixing support, which is far away from the fixing part, and is in gate connection with the nano film strain; the adapter plate is electrically connected with the watertight connector.
6. The wide range liquid level sensor of claim 5, wherein the resilient member comprises a resilient top plate and a resilient side plate disposed circumferentially of the resilient top plate; the elastic top plate is connected with the elastic side plate to form a pressure storage cavity in an enclosing manner;
the mounting part and the inner wall of the fixed bracket are arranged at intervals; the elastic piece is sleeved on the mounting part in an interference fit manner; the inner wall of the pressure storage cavity and the axial end face of the mounting part are arranged at intervals to form the pressure guiding space in a surrounding mode.
7. The wide range liquid level sensor of claim 6, wherein the outer wall of the sealing portion is circumferentially provided with a limiting groove; the inner wall of the fixed support is provided with a hook capable of generating elastic deformation; the hook is hooked in the limiting groove to limit the axial position of the fixed support.
8. The wide range liquid level sensor of claim 5, further comprising a conditioning plate assembly housed within the housing; the conditioning plate assembly comprises a signal conditioning plate and a first conductive column electrically connected with the signal conditioning plate; the position of the adapter plate corresponding to the first conductive column is provided with a conductive hole; one end, far away from the signal conditioning plate, of the first conductive column is inserted into the conductive hole and is electrically connected with the inner wall of the conductive hole; one end of the watertight connector, which faces the signal conditioning plate, is provided with a second conductive column; a connecting hole is formed in the position, corresponding to the second conductive column, of the signal conditioning board; one end, far away from the watertight connector, of the second conductive column is inserted into the connecting hole and is electrically connected with the inner wall of the connecting hole; and/or
An axial end face of one side of the fixing part, which faces the elastic part, is provided with an annular groove arranged along the circumferential direction of the sealing part; the bottom wall of the annular groove is provided with a limiting hole; one end of the fixed support, which is far away from the elastic piece, is provided with a limiting column; one end of the fixed support far away from the elastic piece is accommodated in the annular groove; the limiting column is inserted into the limiting hole.
9. The wide range liquid level sensor of claim 1, further comprising a filter device; the filtering device is arranged at the bottom of the pressure guiding seat and is used for filtering liquid entering the pressure guiding through hole.
10. The wide range liquid level sensor of claim 9, wherein the filtering means is a powder metallurgy microporous filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121252592.8U CN215573213U (en) | 2021-06-04 | 2021-06-04 | Wide-range liquid level sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121252592.8U CN215573213U (en) | 2021-06-04 | 2021-06-04 | Wide-range liquid level sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215573213U true CN215573213U (en) | 2022-01-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121252592.8U Active CN215573213U (en) | 2021-06-04 | 2021-06-04 | Wide-range liquid level sensor |
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| Country | Link |
|---|---|
| CN (1) | CN215573213U (en) |
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2021
- 2021-06-04 CN CN202121252592.8U patent/CN215573213U/en active Active
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