Piezoelectric device and flow meter comprising same
By designing piezoelectric devices of nanofiber membrane, conductive front grid and conductive back grid in the flowmeter and fixing it through limiting slots, the problem of piezoelectric materials vulnerable to high pressure is solved, and higher accuracy and reliability are achieved.
Patent Information
- Application Number
- CN202420685668.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-02
- Publication Date
- 2025-03-11
- Estimated Expiration
- 2034-04-02
AI Technical Summary
The existing flowmeters based on piezoelectric electronics are prone to damage when the liquid pressure is high, resulting in large calculation errors.
A piezoelectric device is designed, including a nanofiber membrane, a conductive front mesh and a conductive rear mesh, which is fixed in the cavity inside the shell through a limiting groove. The conductive front mesh and the conductive rear mesh have through holes, and directly receive liquid pressure through these through holes as liquid flows through these through holes to prevent damage to the nanofiber membrane.
Effectively prevent nanofiber membrane from being damaged under water impact, reduce calculation errors, and improve the accuracy and reliability of the flowmeter.
Smart Images
Figure CN222598882U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of fluid measuring instruments, in particular to a piezoelectric device and a flow meter comprising the same. Background Art
[0002] The flowmeters based on piezoelectric electronics currently on the market use the piezoelectric principle to measure the liquid flow by directly installing piezoelectric materials in the inner cavity of the flowmeter. When the liquid flows through the inside of the flowmeter housing, the water flow generates pressure on the piezoelectric material in the housing. The piezoelectric material converts this pressure into an electrical signal and transmits it through the positive and negative wiring harnesses. The liquid flow rate in the pipeline is calculated by monitoring this electrical signal. However, since the liquid in this flowmeter directly impacts and exerts pressure on the piezoelectric material, the piezoelectric material is easily damaged when the liquid pressure is high. Utility Model Content
[0003] The technical problem to be solved by the utility model is to overcome the defect of large calculation error of the flow meter in the prior art, and to provide a piezoelectric device and a flow meter containing the same.
[0004] The utility model solves the above technical problems through the following technical solutions:
[0005] A piezoelectric device, comprising a nanofiber membrane and a positive and negative wiring harness, the piezoelectric device also comprising:
[0006] A shell, wherein the shell has a first cavity inside, the first cavity is used for liquid to flow through, and a limiting groove is arranged on the inner wall of the shell;
[0007] A conductive front net and a conductive rear net, wherein the conductive front net is attached to one surface of the nanofiber membrane and has a first through hole, and the conductive rear net is attached to the other surface of the nanofiber membrane and has a second through hole, and along the flow direction of the liquid, the first through hole and the second through hole at least partially overlap;
[0008] The positive and negative wire harnesses are electrically connected to the conductive front mesh and the conductive rear mesh respectively;
[0009] The nanofiber membrane, the conductive front mesh and the conductive rear mesh are embedded in the limiting grooves to be fixed in the first cavity.
[0010] In the technical solution, a conductive front net and a conductive rear net are arranged on the two surfaces of the nanofiber membrane, and the limiting groove fixes the nanofiber membrane, the conductive front net and the conductive rear net in the cavity inside the shell. The conductive front net and the conductive rear net have a first through hole and a second through hole respectively, and the first through hole and the second through hole overlap. When the liquid flows through the cavity inside the shell, the liquid can pass through the nanofiber membrane located between the first through hole and the second through hole, and the nanofiber membrane directly receives the liquid pressure through the first through hole and the second through hole; at the same time, since the conductive front net and the conductive rear net have good supporting capacity, the nanofiber membrane is well supported and fixed, preventing the nanofiber membrane from being damaged under the impact of water flow. The conductive front net and the conductive rear net are made of conductive material, so that the positive and negative wire bundles for receiving the electrical signal of the nanofiber membrane can be electrically connected to the nanofiber membrane via the conductive front net and the conductive rear net, so that the two side surfaces of the nanofiber membrane are in an open state, providing space for the arrangement of the conductive front net and the conductive rear net.
[0011] Preferably, the first through hole and the second through hole completely overlap.
[0012] In the present technical solution, by setting the first through hole and the second through hole to completely overlap, when the through hole area on the conductive front net or the through hole area on the conductive rear net remains unchanged, the completely overlapping first through hole and the second through hole can make the liquid flow through the nanofiber membrane through the through holes greater, that is, under the same structural strength, the completely overlapping first through hole and the second through hole can make the liquid flow through the nanofiber membrane greater.
[0013] Preferably, the first through holes are evenly distributed on the conductive front net, and the second through holes are evenly distributed on the conductive rear net.
[0014] In the technical solution, the first through holes and the second through holes are arranged to be evenly distributed, thereby ensuring that the nanofiber membrane is evenly compressed.
[0015] Preferably, the limiting groove is an annular groove arranged on the inner wall of the shell.
[0016] In the present technical solution, the specific shape of the limiting groove is set as an annular groove, so that the nanofiber membrane, the conductive front mesh and the conductive rear mesh are fixed with grooves in the circumferential direction compared with other groove shapes, so that the nanofiber membrane, the conductive front mesh and the conductive rear mesh are more firmly fixed in the shell.
[0017] Preferably, the shell is elastic, and the shell clamps and fixes the nanofiber membrane, the conductive front net and the conductive rear net by elastic deformation.
[0018] In this technical solution, compared with using other means (such as gluing, etc.) to fix the nanofiber membrane conductive front net and the conductive rear net, the elastic force of the shell is used to fix the nanofiber membrane conductive front net and the conductive rear net, which makes the installation simpler and more reliable.
[0019] Preferably, a wire outlet is further provided on the outer wall of the shell, the wire outlet is communicated with the limiting groove, and the positive and negative wire harnesses are led out of the first cavity from the wire outlet.
[0020] In this technical solution, by setting a wire outlet, the wire outlet is connected to the limiting groove, and the positive and negative wire harnesses can connect the conductive front mesh and the conductive rear mesh through the wire outlet to output the electrical signal generated by the nanofiber membrane.
[0021] Preferably, a waterproof sealant is provided in the wire outlet, and the waterproof sealant fills the entire wire outlet.
[0022] In the technical solution, a waterproof sealant is provided in the wire outlet to prevent liquid from overflowing from the wire outlet.
[0023] Preferably, the nanofiber membrane, the conductive front mesh and the conductive rear mesh are arranged in the middle of the shell.
[0024] A flow meter includes the piezoelectric device as described above, and also includes a joint body, wherein the joint body has a second cavity inside, the shell is arranged in the second cavity, and a fixing groove is arranged on the inner wall of the joint body, and the fixing groove can limit the axial movement of the shell.
[0025] In the present technical solution, a flow meter is made by using the piezoelectric device as described above. A piezoelectric device is arranged in the second cavity of the connector body. The structure is relatively simple. The nanofiber membrane can generate different corresponding open-circuit voltages under the impact of different water inlet pressures. The voltage is transmitted to the single-chip microcomputer through the positive and negative wiring harnesses, thereby indirectly calculating the instantaneous flow of the pipeline. Combined with time, the flow value during the period can be accumulated. Such a flow meter has a small calculation error and high accuracy.
[0026] Preferably, the connector body is further provided with a reserved outlet for a wire, and the reserved outlet for a wire is in the same direction as the outlet.
[0027] In the present technical solution, a wire outlet reserved opening is provided on the connector body, and the wire outlet reserved opening is in the same direction as the wire outlet port. After the positive and negative wire harnesses are led out from the wire outlet port, they are connected to the single-chip microcomputer along the wire outlet reserved opening, thereby providing a specific solution for leading out the positive and negative wire harnesses.
[0028] The positive and progressive effect of the utility model is that: by arranging the conductive front net and the conductive rear net on the two surfaces of the nanofiber membrane, the limiting groove fixes the nanofiber membrane, the conductive front net and the conductive rear net in the cavity inside the shell, the conductive front net and the conductive rear net respectively have a first through hole and a second through hole, and the first through hole and the second through hole overlap, when the liquid flows through the cavity inside the shell, the liquid can pass through the nanofiber membrane located between the first through hole and the second through hole, and the nanofiber membrane directly receives the liquid pressure through the first through hole and the second through hole; at the same time, because the conductive front net and the conductive rear net have good supporting capacity, the nanofiber membrane is well supported and fixed, preventing the nanofiber membrane from being damaged under the impact of water flow. The conductive front net and the conductive rear net are made of conductive material, so that the positive and negative wire harnesses for receiving the electrical signal of the nanofiber membrane can be electrically connected to the nanofiber membrane via the conductive front net and the conductive rear net, so that the two side surfaces of the nanofiber membrane are in an open state, providing space for the arrangement of the conductive front net and the conductive rear net. BRIEF DESCRIPTION OF THE DRAWINGS
[0029] Figure 1 It is a structural schematic diagram of a flow meter according to an embodiment of the utility model.
[0030] Figure 2 The figure is a schematic cross-sectional structure diagram of a flow meter according to an embodiment of the present utility model.
[0031] Figure 3 It is a schematic cross-sectional structure diagram of a joint body according to an embodiment of the utility model.
[0032] Figure 4 This is a schematic structural diagram of a piezoelectric device according to an embodiment of the present invention (I).
[0033] Figure 5 This is a structural schematic diagram of a piezoelectric device according to an embodiment of the present utility model (II).
[0034] Figure 6 This is a schematic cross-sectional structural diagram of a piezoelectric device according to an embodiment of the present invention (I).
[0035] Figure 7 This is a schematic cross-sectional structural diagram of a piezoelectric device according to an embodiment of the present invention (II).
[0036] Figure 8 for Figure 7 A is an enlarged view of the middle image.
[0037] Fig. 9 The figure is a schematic structural diagram of a conductive front mesh and a conductive rear mesh according to an embodiment of the present invention.
[0038] Description of reference numerals:
[0039] Piezoelectric device 001
[0040] Nanofiber membrane 110
[0041] Housing 130
[0042] Limiting slot 131
[0043] Outlet 132
[0044] First cavity 133
[0045] Conductive front mesh 140
[0046] The first through hole 141
[0047] Conductive back net 150
[0048] The second through hole 151
[0049] Flow meter 002
[0050] Connector body 210
[0051] The second cavity 211
[0052] Fixed slot 212
[0053] Outlet reserved port 213 DETAILED DESCRIPTION
[0054] A preferred embodiment is given below, and the present invention is described more clearly and completely in conjunction with the accompanying drawings.
[0055] like Figure 1-Figure 9 As shown, this embodiment provides a flow meter 002, which includes a piezoelectric device 001 and a joint body 210, wherein the joint body 210 has a second cavity 211 inside, and the housing 130 is disposed in the second cavity 211. A fixing groove 212 is disposed on the joint body 210, and the fixing groove 212 can limit the axial movement of the housing 130. Specifically, as Figure 2 and Figure 3 As shown, the diameter of the shell 130 is slightly larger than the diameter of the second cavity 211. After the shell 130 is installed in the second cavity 211 by utilizing the elasticity of the shell 130, the fixing groove 212 prevents the shell 130 from axial movement, and the shell 130 is fixed at the fixing groove 212. The flow meter 002 made by using the piezoelectric device 001 as described above is provided with the piezoelectric device 001 in the second cavity 211 of the joint body 210, and the structure is relatively simple. The nanofiber membrane 110 can generate different corresponding open circuit voltages under the impact of different water inlet pressures. The voltage is transmitted to the single chip microcomputer through the positive and negative wiring harnesses, thereby indirectly calculating the instantaneous flow of the pipeline. Combined with the time, the flow value during the period can be accumulated. Such a flow meter 002 has a small calculation error and high accuracy.
[0056] Specifically in this embodiment, the connector body 210 is provided with a wire outlet reserved opening 213, which is in the same direction as the wire outlet 132. After the positive and negative wires are led out from the wire outlet 132, they are connected to the single-chip microcomputer along the wire outlet reserved opening 213. After the positive and negative wires are connected, the wire outlet reserved opening 213 is also filled with waterproof sealant to prevent the connector from leaking.
[0057] In this embodiment, the specific structure of the piezoelectric device 001 is as follows: Figure 4-Figure 9 As shown, it is applied in a flow meter 002 to generate and output an electrical signal, through which the liquid flow rate passing through the inner cavity of the flow meter is calculated. The piezoelectric device 001 includes a nanofiber membrane 110 and positive and negative wiring harnesses (not shown in the figure), and also includes a shell 130, a conductive front net 140 and a conductive rear net 150. The shell 130 has a first cavity 133 inside, and the cavity is used for liquid to flow through. A limiting groove 131 is arranged on the inner wall of the shell 130, and the conductive front net 140 is attached to one surface of the nanofiber membrane 110, and the conductive rear net 150 is attached to the other surface of the nanofiber membrane 110. An electrical connection is formed between the conductive front net 140 and the conductive rear net 150. The conductive front net 140 has a first through hole 141, and the conductive rear net 150 has a second through hole 151. Along the direction of liquid flow, the first through hole 141 and the second through hole 151 at least partially overlap, and the overlapping part of the first through hole 141 and the second through hole 151 is for liquid to flow through the nanofiber membrane 110. The positive and negative wire harnesses are electrically connected to the conductive front net 140 and the conductive rear net 150, respectively, to output the open circuit voltage generated by the nanofiber membrane 110. The nanofiber membrane 110, the conductive front net 140, and the conductive rear net 150 are all embedded in the limiting groove 131 to be fixed in the first cavity 133. By respectively setting the first through hole 141 and the second through hole 151 on the conductive front net 140 and the conductive rear net 150, and the first through hole 141 and the second through hole 151 overlap, when the liquid flows through the cavity inside the housing 130, the liquid can pass through the nanofiber membrane 110 between the first through hole 141 and the second through hole 151, and the nanofiber membrane 110 directly feels the liquid pressure at the first through hole 141 and the second through hole 151, thereby generating a piezoelectric voltage. At the same time, since the conductive front net 140 and the conductive rear net 150 have good supporting capabilities, the nanofiber membrane 110 is well supported and fixed. Since both the conductive front mesh 140 and the conductive rear mesh 150 are made of conductive materials, the positive and negative wire bundles for receiving the electrical signals of the nanofiber membrane 110 can be electrically connected to the nanofiber membrane 110 via the conductive front mesh 140 and the conductive rear mesh 150, so that the two side surfaces of the nanofiber membrane 110 are in an open state, providing space for the arrangement of the conductive front mesh 140 and the conductive rear mesh 150.
[0058] Specifically in this embodiment, the first through hole 141 and the second through hole 151 are completely identical in shape and size and aligned, that is, the first through hole 141 and the second through hole 151 are completely overlapped. By setting the first through hole 141 and the second through hole 151 to completely overlap, when the through hole area on the conductive front mesh 140 or the through hole area on the conductive rear mesh 150 remains unchanged, the completely overlapped first through hole 141 and the second through hole 151 can make the liquid flow through the nanofiber membrane 110 larger, that is, under the same structural strength, the completely overlapped first through hole 141 and the second through hole 151 can make the liquid flow through the nanofiber membrane 110 larger. When the piezoelectric device 001 is used to make a flowmeter, under the same structural strength, the completely overlapped first through hole 141 and the second through hole 151 can make the flowmeter have a larger range.
[0059] Of course, in other embodiments, as long as the first through hole 141 and the second through hole 151 partially overlap in the direction of liquid flow, it is ensured that the liquid can flow through the nanofiber membrane 110 and the nanofiber membrane 110 can feel the pressure of the liquid to generate an open circuit voltage.
[0060] In this embodiment, the first through holes 141 and the second through holes 151 are evenly distributed on the conductive front mesh 140 and the conductive rear mesh 150 , respectively, to ensure that the nanofiber membrane 110 is evenly compressed.
[0061] Specifically, if Figure 6-Figure 9 As shown, the conductive front mesh 140 and the conductive rear mesh 150 are two identical thin sheets with evenly distributed circular through holes, the nanofiber membrane 110 is heavily armored on the conductive front mesh 140 and the conductive rear mesh 150, the through holes on the conductive front mesh 140 and the conductive rear mesh 150 are completely aligned, the first through hole 141 and the second through hole 151 are both liquid circulation channels and structures that enable the nanofiber membrane 110 to directly sense liquid pressure.
[0062] In this embodiment, the limiting groove 131 is an annular groove arranged on the inner wall of the shell 130, that is, there is a groove in the circumferential direction of the shell 130, and the nanofiber membrane 110, the conductive front net 140 and the conductive rear net 150 are all fixed with grooves in the circumferential direction, so that the nanofiber membrane 110, the conductive front net 140 and the conductive rear net 150 are more firmly fixed in the shell 130.
[0063] Specifically in this embodiment, the shell 130 is elastic, and the shell 130 has an elastic effect on the nanofiber membrane 110, the conductive front net 140 and the conductive rear net 150 arranged in the limiting groove 131 to fix the nanofiber membrane 110, the conductive front net 140 and the conductive rear net 150. Therefore, in fact, the width of the limiting groove 131 is smaller than the sum of the thicknesses of the nanofiber membrane 110, the conductive front net 140 and the conductive rear net 150, and the elasticity of the shell 130 is used to embed the nanofiber membrane 110, the conductive front net 140 and the conductive rear net 150 in the limiting groove 131. In this way, the nanofiber membrane 110, the conductive front net 140 and the conductive rear net 150 are fixed by the elastic force of the shell 130, and the structure of the piezoelectric device 001 is relatively simple.
[0064] Of course, in other embodiments, the nanofiber membrane 110, the conductive front mesh 140 and the conductive rear mesh 150 may also be fixed in the first cavity 133 by glue, screws or other fixing methods in the prior art, which will not be repeated here.
[0065] like Figure 4-Figure 7 As shown, in the present embodiment, a wire outlet 132 is further provided on the shell 130, and the wire outlet 132 is connected with the limiting groove 131, and the positive and negative wire harnesses are led out from the wire outlet 132 to the outside of the first cavity 133 (the positive and negative wire harnesses in the figure are not shown). By setting the wire outlet 132, the wire outlet 132 is connected with the limiting groove 131, and the positive and negative wire harnesses can be connected to the conductive front mesh 140 and the conductive rear mesh 150 through the wire outlet 132 to output the electrical signal generated by the nanofiber membrane 110.
[0066] Specifically, the wire outlet 132 is a circular through hole extending from the outer wall of the shell 130 to the limiting groove 131. The size of the wire outlet 132 is set to be larger than the size of the positive and negative wire harnesses to facilitate the installation of the positive and negative wire harnesses. A waterproof sealant is set in the wire outlet 132, and the waterproof sealant fills the entire wire outlet 132 to prevent liquid from overflowing or leaking from the wire outlet 132.
[0067] In this embodiment, the limiting groove 131 is arranged in the middle of the housing 130, and the nanofiber membrane 110, the conductive front net 140 and the conductive rear net 150 are arranged in the limiting groove 131. By arranging the nanofiber membrane 110, the conductive front net 140 and the conductive rear net 150 in the middle of the housing 130, the structure of the piezoelectric device 001 is more beautiful.
[0068] Although the specific implementations of the utility model are described above, those skilled in the art should understand that this is only an example, and the protection scope of the utility model is defined by the attached claims. Those skilled in the art can make various changes or modifications to these implementations without departing from the principle and essence of the utility model, but these changes and modifications fall within the protection scope of the utility model.
Claims
1. A piezoelectric device comprising a nanofiber membrane and a positive and negative wiring harness, characterized in that: The piezoelectric device also includes: A shell, wherein the shell has a first cavity inside, the first cavity is used for liquid to flow through, and a limiting groove is arranged on the inner wall of the shell; A conductive front net and a conductive rear net, wherein the conductive front net is attached to one surface of the nanofiber membrane and has a first through hole, and the conductive rear net is attached to the other surface of the nanofiber membrane and has a second through hole, and along the flow direction of the liquid, the first through hole and the second through hole at least partially overlap; The positive and negative wire harnesses are electrically connected to the conductive front mesh and the conductive rear mesh respectively; The nanofiber membrane, the conductive front mesh and the conductive rear mesh are embedded in the limiting grooves to be fixed in the first cavity.
2. The piezoelectric device according to claim 1, wherein The first through hole and the second through hole completely overlap.
3. The piezoelectric device according to claim 2, wherein: The first through holes are evenly distributed on the conductive front mesh, and the second through holes are evenly distributed on the conductive rear mesh.
4. The piezoelectric device according to claim 1, wherein The limiting groove is an annular groove arranged on the inner wall of the shell.
5. The piezoelectric device according to claim 4, wherein: The shell is elastic, and clamps and fixes the nanofiber membrane, the conductive front net and the conductive rear net by elastic deformation.
6. The piezoelectric device according to any one of claims 1 to 5, characterized in that: A wire outlet is also provided on the outer wall of the shell, the wire outlet is communicated with the limiting groove, and the positive and negative wire harnesses are led out of the first cavity from the wire outlet.
7. The piezoelectric device according to claim 6, wherein: The outlet is provided with waterproof sealant, and the waterproof sealant fills the entire outlet.
8. The piezoelectric device according to claim 6, wherein: The nanofiber membrane, the conductive front mesh and the conductive rear mesh are arranged in the middle position of the shell.
9. A flow meter, characterized in that: It includes a piezoelectric device as described in any one of claims 6 to 8, and the flow meter also includes a joint body, the joint body has a second cavity inside, the shell is arranged in the second cavity, and a fixing groove is arranged on the inner wall of the joint body, and the fixing groove can limit the axial movement of the shell.
10. The flow meter according to claim 9, characterized in that The connector body is also provided with a reserved outlet for wires, and the direction of the reserved outlet for wires is the same as that of the outlet.