CN215984693U - High-temperature-resistant precession vortex piezoelectric sensor - Google Patents
High-temperature-resistant precession vortex piezoelectric sensor Download PDFInfo
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- CN215984693U CN215984693U CN202122106618.4U CN202122106618U CN215984693U CN 215984693 U CN215984693 U CN 215984693U CN 202122106618 U CN202122106618 U CN 202122106618U CN 215984693 U CN215984693 U CN 215984693U
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Abstract
The utility model relates to the technical field of flow sensors, in particular to a high-temperature-resistant precession vortex piezoelectric sensor which comprises a body and a fixing device, wherein the body comprises a base and a shell arranged at the top of the base, a heat insulation material is arranged in a cavity of the shell, a lower pressing block and a piezoelectric negative plate arranged at the top of the lower pressing block are arranged at the top of the base, a piezoelectric crystal and a piezoelectric positive plate arranged at the top of the piezoelectric negative plate are arranged at the top of the piezoelectric negative plate, an upper pressing block is arranged at the top of the piezoelectric positive plate, a pressing screw penetrates through the center of the assembly, an adjusting screw is arranged inside the upper pressing block, a spring is arranged on the outer wall of the upper pressing block, and an output end is arranged on the outer wall of the base; this device passes through the pressfitting screw and fixes each subassembly pressfitting, need not to connect through conducting resin, can not appear splicing unstability, the problem that drops easily under high temperature and vibrations environment, can adjust prestressing force through the adjusting screw in addition, makes piezoelectric wafer be in sensitive state all the time, has improved measuring precision.
Description
Technical Field
The utility model relates to the technical field of flow sensors, in particular to a high-temperature-resistant precession vortex piezoelectric sensor.
Background
A piezoelectric sensor is a sensor based on the piezoelectric effect. Is a self-generating and electromechanical transducer. Its sensitive element is made of piezoelectric material. The piezoelectric material generates electric charges on the surface after being stressed. The charge is amplified by the charge amplifier and the measuring circuit and transformed into impedance, and then the electric quantity proportional to the external force is output. Piezoelectric transducers are used to measure forces and non-electrical physical quantities that can be converted into electricity. The piezoelectric sensor has the advantages of wide frequency band, high sensitivity, high signal-to-noise ratio, simple structure, reliable operation, light weight and the like.
However, the conventional piezoelectric sensor generally adopts conductive adhesive to bond the piezoelectric ceramic sheet and the metal original sheet, and the bonding has the following defects: 1. the adopted bonding method has higher process requirements, and the metal wafer and the piezoelectric ceramic wafer need to be flat, otherwise, the metal wafer and the piezoelectric ceramic wafer are not bonded stably, and the metal wafer and the piezoelectric ceramic wafer fall off; 2. by using the gluing method, the metal wafer and the piezoelectric ceramic wafer are easy to break glue and fail in a high-temperature continuous vibration environment; 3. the prestress applied by the piezoelectric ceramic cannot be adjusted.
SUMMERY OF THE UTILITY MODEL
Solves the technical problem
Aiming at the defects in the prior art, the utility model provides a high-temperature-resistant precession vortex piezoelectric sensor, which solves the problems that the requirement on the process is high, glue is easy to break under high-temperature and vibration environments, and the prestress applied to piezoelectric ceramics cannot be adjusted in the existing gluing method.
Technical scheme
In order to achieve the purpose, the utility model is realized by the following technical scheme:
a high-temperature-resistant precession vortex piezoelectric sensor comprises a body and a fixing device, wherein the body comprises a base and a shell arranged at the top of the base, a hollow part in the shell is provided with a thermal insulation material, the top of the base is provided with a lower pressing block and a piezoelectric negative plate arranged at the top of the lower pressing block, the top of the piezoelectric negative plate is provided with a piezoelectric crystal and a piezoelectric positive plate arranged at the top of the piezoelectric crystal, the top of the piezoelectric positive plate is provided with an upper pressing block, pressing screws and rubber gaskets arranged on the outer walls of the pressing screws penetrate through the centers of the lower pressing block, the piezoelectric negative plate, the piezoelectric crystal, the piezoelectric positive plate and the upper pressing block, two groups of adjusting screws are correspondingly distributed in the upper pressing block, the outer walls of the adjusting screws are provided with springs, the outer wall of the piezoelectric positive plate is connected with a positive wire, and the outer wall of the piezoelectric negative plate is connected with a negative wire, the outer wall of base is provided with the output, the one end and the output of anodal wire and negative pole wire are connected.
Furthermore, the number of the group is two, the number of the adjusting screws is four, and the bottom ends of the adjusting screws are in spiral fit with the lower pressing block. The adjusting screw is screwed to apply prestress on the piezoelectric crystal, so that the piezoelectric crystal always keeps higher sensitivity, and the flow in the pipe is more accurately detected.
Furthermore, the top end of the spring is attached to the upper pressing block, and the bottom end of the spring is attached to the lower pressing block. The spring gives the piezoelectric crystal and the component vibration interval, and the device does not influence measurement when in work.
Furthermore, the pressing screw penetrates through the centers of the lower pressing block, the piezoelectric negative plate, the piezoelectric crystal, the piezoelectric positive plate and the upper pressing block and is spirally connected with the base through the bottom end.
Further, the material of the shell is 316 stainless steel, and the material poured inside the shell is epoxy resin. The 316 stainless steel has particularly good atmospheric corrosion resistance and high-temperature strength, and can be used under harsh conditions; excellent in work hardening properties (non-magnetic properties); epoxy resin is added into the cavity, so that the heat insulation effect of the device is further improved, and the device can continuously work in a high-temperature environment.
Furthermore, the material of the upper pressing block and the lower pressing block is insulating ceramic. The piezoelectric positive plate and the piezoelectric negative plate can be well insulated by adopting the insulating ceramic, so that the piezoelectric positive plate and the piezoelectric negative plate cannot influence each other.
Furthermore, the piezoelectric crystal is made of any one of lithium niobate, lithium tantalate, lithium gallate and bismuth germanate piezoelectric single crystals. The materials have good high-temperature resistance and can continuously work in a high-temperature environment.
Furthermore, the outer wall of body is provided with the fixing base and installs a set of articulated seat at the fixing base outer wall, articulated seat keeps away from the inside pivot that sets up of one end of fixing base, the outer wall of pivot is provided with the roating seat and installs the solid fixed ring in roating seat one side.
Furthermore, the outer wall of one end of the fixing ring is provided with opposite fixing pieces, and bolts are spirally arranged inside the fixing pieces. The device is arranged on the precession vortex flowmeter through the bolt, the fixing piece and the fixing ring, and the installation and the disassembly are more convenient.
Advantageous effects
Compared with the known public technology, the technical scheme provided by the utility model has the following beneficial effects:
the body is arranged in the fixing ring, the device is clamped on the precession vortex flowmeter by the fixing piece, the bolt is screwed, and the device is fixed at the throat part of the precession vortex flowmeter, so that the base of the device is contacted with the outer wall of the flowmeter. The device is arranged on the precession vortex flowmeter by adopting the bolt, the fixing piece and the fixing ring, and the installation and the disassembly are more convenient. When the body is installed, the lower pressing block, the piezoelectric negative plate, the piezoelectric crystal, the piezoelectric positive plate and the upper pressing block are sequentially placed on the base, and the components are fixed to the top of the base through pressing screws; the springs are distributed at four positions of the holes, the adjusting screws penetrate through the upper pressing block, the lower pressing block is screwed in, the adjusting screws are screwed, and a proper prestress is applied to the piezoelectric crystal to keep the piezoelectric crystal in a sensitive state. One end of the positive wire is connected with the piezoelectric positive plate, the other end of the positive wire is connected with the output end, and similarly, one end of the negative wire is connected with the piezoelectric negative plate, and the other end of the negative wire is connected with the output end. And (3) pouring heat insulation materials into the cavity of the shell, sealing, and then installing the shell on the base.
By adopting the structure and the installation method, the components are bonded without using conductive adhesive, so that the problems of high process requirements and easy glue failure in high-temperature and vibration environments can be solved; in addition, the adjusting screw can be screwed to apply prestress to the piezoelectric crystal, so that the piezoelectric crystal always keeps higher sensitivity, the detection of the flow in the pipe is more accurate, the spring gives vibration intervals to the piezoelectric crystal and the component, and the measurement is not influenced when the device works. The shell is made of 316 stainless steel, and the 316 stainless steel has particularly good atmospheric corrosion resistance and high-temperature strength and can be used under harsh conditions; excellent in work hardening properties (non-magnetic properties); epoxy resin is added into the cavity, so that the heat insulation effect of the device is further improved, and the device can continuously work in a high-temperature environment. The upper and lower pressing pieces are made of insulating ceramics, and the piezoelectric positive plate and the piezoelectric negative plate can be well insulated by the insulating ceramics, so that the piezoelectric positive plate and the piezoelectric negative plate cannot influence each other; the piezoelectric crystal is made of lithium niobate, lithium tantalate, lithium gallate and bismuth germanate piezoelectric single crystals, has good high-temperature resistance, and can not cause the problem of inaccurate measurement due to disorder of the piezoelectric crystal in a high-temperature environment.
This device passes through the pressfitting screw and fixes each subassembly pressfitting, need not to connect through conducting resin, can not appear splicing unstably, the problem that drops easily under high temperature and vibrations environment, can adjust prestressing force through adjusting screw in addition, makes piezoelectric wafer be in sensitive state all the time, has improved measuring precision, and the convenience is dismantled in the installation simultaneously.
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 utility model, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 is a schematic perspective view of the present invention;
FIG. 2 is a schematic view of the position structure of the present invention A;
FIG. 3 is an enlarged schematic view of the structure at A in FIG. 2;
FIG. 4 is a schematic top sectional view of the body of the present invention.
The reference numerals in the drawings denote: 1. a body; 2. a fixing device; 101. a base; 102. a housing; 103. a thermal insulation material; 104. pressing the pressing block; 105. a piezoelectric negative plate; 106. a piezoelectric crystal; 107. a piezoelectric positive plate; 108. an upper pressing block; 109. pressing the screws; 110. a rubber gasket; 111. adjusting screws; 112. a spring; 113. a positive electrode lead; 114. a negative electrode lead; 115. an output end; 201. a fixed seat; 202. a hinged seat; 203. a rotating shaft; 204. a rotating base; 205. a fixing ring; 206. a bolt; 207. a sheet is fixed.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all 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.
The present invention will be further described with reference to the following examples.
Examples
The high-temperature-resistant precession vortex piezoelectric sensor of this embodiment, as shown in fig. 1, be provided with fixing base 201 and install a set of articulated seat 202 at fixing base 201 outer wall including the outer wall of body 1, articulated seat 202 keeps away from the inside pivot 203 that sets up of one end of fixing base 201, the outer wall of pivot 203 is provided with roating seat 204 and installs the solid fixed ring 205 in roating seat 204 one side, the one end outer wall of solid fixed ring 205 is provided with relative stationary blade 207, the inside spiral of stationary blade 207 is provided with bolt 206.
The body is arranged in the fixing ring, the device is clamped on the precession vortex flowmeter by the fixing piece, the bolt is screwed, and the device is fixed at the throat part of the precession vortex flowmeter, so that the base of the device is contacted with the outer wall of the flowmeter. The device is arranged on the precession vortex flowmeter by adopting the bolt, the fixing piece and the fixing ring, and the installation and the disassembly are more convenient.
As shown in fig. 1, 3 and 4, the device comprises a body 1 and a fixing device 2, a casing 102 is arranged on the top of a base 101, a heat insulating material 103 is arranged in a hollow part inside the casing 102, a lower pressing block 104 and a piezoelectric negative plate 107 arranged on the top of the lower pressing block 104 are arranged on the top of the base 101, a piezoelectric crystal 106 and a piezoelectric positive plate 105 arranged on the top of the piezoelectric crystal 106 are arranged on the top of the piezoelectric negative plate 107, an upper pressing block 108 is arranged on the top of the piezoelectric positive plate 105, a pressing screw 109 and a rubber gasket 110 arranged on the outer wall of the pressing screw 109 penetrate through the centers of the lower pressing block 104, the piezoelectric negative plate 107, the piezoelectric crystal 106, the piezoelectric positive plate 105 and the upper pressing block 108, two sets of adjusting screws 111 are correspondingly distributed inside the upper pressing block 108, a spring 112 is arranged on the outer wall of the adjusting screw 111, a positive lead 113 is connected to the outer wall of the piezoelectric positive plate 107, the outer wall of the piezoelectric negative pole piece 105 is connected with a negative pole lead 114, the outer wall of the base 101 is provided with an output end 115, and one ends of the positive pole lead 113 and the negative pole lead 114 are connected with the output end 115. The number of the group is two, the number of the adjusting screws 111 is four, and the bottom ends of the adjusting screws 111 are in threaded fit with the lower pressing block 104. The pressing screw 109 penetrates through the centers of the lower pressing block 104, the negative piezoelectric plate 107, the piezoelectric crystal 106, the positive piezoelectric plate 105 and the upper pressing block 108 and is spirally connected with the base 101 through the bottom end. The top end of the spring 112 abuts the upper snap block 108 and the bottom end abuts the lower snap block 104.
When the body is installed, the lower pressing block, the piezoelectric negative plate, the piezoelectric crystal, the piezoelectric positive plate and the upper pressing block are sequentially placed on the base, and the components are fixed to the top of the base through pressing screws; the springs are distributed at four positions of the holes, the adjusting screws penetrate through the upper pressing block, the lower pressing block is screwed in, the adjusting screws are screwed, and a proper prestress is applied to the piezoelectric crystal to keep the piezoelectric crystal in a sensitive state. One end of the positive wire is connected with the piezoelectric positive plate, the other end of the positive wire is connected with the output end, and similarly, one end of the negative wire is connected with the piezoelectric negative plate, and the other end of the negative wire is connected with the output end. And (3) pouring heat insulation materials into the cavity of the shell, sealing, and then installing the shell on the base.
By adopting the structure and the installation method, the components are bonded without using conductive adhesive, so that the problems of high process requirements and easy glue failure in high-temperature and vibration environments can be solved; in addition, the adjusting screw can be screwed to apply prestress to the piezoelectric crystal, so that the piezoelectric crystal always keeps higher sensitivity, the detection of the flow in the pipe is more accurate, the spring gives vibration intervals to the piezoelectric crystal and the component, and the measurement is not influenced when the device works.
As shown in fig. 3, the material of the housing 102 is 316 stainless steel, and the material poured into the housing 102 is epoxy. The material of the upper and lower lamination blocks 108, 104 is an insulating ceramic. The piezoelectric crystal 106 is made of any one of lithium niobate, lithium tantalate, lithium gallate and bismuth germanate piezoelectric single crystals.
The shell is made of 316 stainless steel, and the 316 stainless steel has particularly good atmospheric corrosion resistance and high-temperature strength and can be used under harsh conditions; excellent in work hardening properties (non-magnetic properties); epoxy resin is added into the cavity, so that the heat insulation effect of the device is further improved, and the device can continuously work in a high-temperature environment. The upper and lower pressing pieces are made of insulating ceramics, and the piezoelectric positive plate and the piezoelectric negative plate can be well insulated by the insulating ceramics, so that the piezoelectric positive plate and the piezoelectric negative plate cannot influence each other; the piezoelectric crystal is made of lithium niobate, lithium tantalate, lithium gallate and bismuth germanate piezoelectric single crystals, has good high-temperature resistance, and can not cause the problem of inaccurate measurement due to disorder of the piezoelectric crystal in a high-temperature environment.
This device passes through the pressfitting screw and fixes each subassembly pressfitting, need not to connect through conducting resin, can not appear splicing unstably, the problem that drops easily under high temperature and vibrations environment, can adjust prestressing force through adjusting screw in addition, makes piezoelectric wafer be in sensitive state all the time, has improved measuring precision, and the convenience is dismantled in the installation simultaneously.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the corresponding technical solutions.
Claims (9)
1. The utility model provides a high temperature resistant precession vortex piezoelectric sensor, includes body (1) and fixing device (2), its characterized in that: the body (1) comprises a base (101) and a shell (102) arranged at the top of the base (101), a heat insulating material (103) is arranged in a hollow position in the shell (102), a lower pressing block (104) and a piezoelectric negative plate (105) arranged at the top of the lower pressing block (104) are arranged at the top of the base (101), a piezoelectric crystal (106) and a piezoelectric positive plate (107) arranged at the top of the piezoelectric crystal (106) are arranged at the top of the piezoelectric negative plate (105), an upper pressing block (108) is arranged at the top of the piezoelectric positive plate (107), pressing screws (109) and rubber gaskets (110) arranged on the outer wall of the pressing screws (109) penetrate through the centers of the lower pressing block (104), the piezoelectric negative plate (105), the piezoelectric crystal (106), the piezoelectric positive plate (107) and the upper pressing block (108), and two groups of adjusting screws (111) are correspondingly distributed in the upper pressing block (108), the outer wall of adjusting screw (111) is provided with spring (112), the outer wall of the positive pressure electric plate (107) is connected with anodal wire (113), the outer wall of negative pressure electric plate (105) is connected with negative pole wire (114), the outer wall of base (101) is provided with output (115), the one end and the output (115) of anodal wire (113) and negative pole wire (114) are connected.
2. The high-temperature-resistant precession vortex piezoelectric transducer according to claim 1, wherein the number of said group is two, the number of said adjusting screws (111) is four, and the bottom end of adjusting screw (111) is screw-fitted with lower pressing block (104).
3. The high temperature resistant precession vortex piezoelectric sensor of claim 1, wherein the top end of the spring (112) is attached to the upper press block (108) and the bottom end is attached to the lower press block (104).
4. The high-temperature-resistant precession vortex piezoelectric transducer according to claim 1, wherein the stitching screw (109) penetrates the center of the lower stitching block (104), the negative piezoelectric plate (105), the piezoelectric crystal (106), the positive piezoelectric plate (107) and the upper stitching block (108) and is connected with the base (101) in a spiral manner through the bottom end.
5. The high temperature resistant precession vortex piezoelectric sensor of claim 1 wherein the material of the housing (102) is 316 stainless steel and the material poured inside the housing (102) is epoxy.
6. The high temperature resistant precession vortex piezoelectric sensor of claim 1, wherein the material of the upper and lower press-fit blocks (108, 104) is insulating ceramic.
7. The high temperature resistant precession vortex piezoelectric transducer according to claim 1, wherein the piezoelectric crystal (106) is made of any one of lithium niobate, lithium tantalate, lithium gallate and bismuth germanate piezoelectric single crystal.
8. The high-temperature-resistant precession vortex piezoelectric transducer according to claim 1, wherein the outer wall of the body (1) is provided with a fixed base (201) and a set of hinged bases (202) installed on the outer wall of the fixed base (201), a rotating shaft (203) is installed inside one end of the hinged base (202) far away from the fixed base (201), and the outer wall of the rotating shaft (203) is provided with a rotating base (204) and a fixed ring (205) installed on one side of the rotating base (204).
9. The high-temperature-resistant precession vortex piezoelectric transducer according to claim 8, wherein the fixing ring (205) is provided with opposing fixing plates (207) on one end outer wall, and the fixing plates (207) are provided with bolts (206) in a spiral manner inside.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122106618.4U CN215984693U (en) | 2021-09-02 | 2021-09-02 | High-temperature-resistant precession vortex piezoelectric sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122106618.4U CN215984693U (en) | 2021-09-02 | 2021-09-02 | High-temperature-resistant precession vortex piezoelectric sensor |
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| Publication Number | Publication Date |
|---|---|
| CN215984693U true CN215984693U (en) | 2022-03-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122106618.4U Active CN215984693U (en) | 2021-09-02 | 2021-09-02 | High-temperature-resistant precession vortex piezoelectric sensor |
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| CN (1) | CN215984693U (en) |
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2021
- 2021-09-02 CN CN202122106618.4U patent/CN215984693U/en active Active
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