A piezoelectric ceramic mounting structure and its micropump

Abstract

This invention proposes a piezoelectric ceramic mounting structure and its micropump. The piezoelectric ceramic mounting structure is used to mount the piezoelectric ceramic on the substrate of the micropump. It includes a clamping assembly for clamping the piezoelectric ceramic and the substrate. One end of the substrate has a receiving space for inserting and mounting the piezoelectric ceramic. The clamping assembly includes a clamping component and an adjusting component for adjusting the pressure of the clamping component on the piezoelectric ceramic. In this design, the adjusting component controls the movement of the clamping component, and the clamping component clamps the piezoelectric ceramic, effectively preventing the edges of the piezoelectric ceramic from being crushed.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically to a piezoelectric ceramic mounting structure and its micropump. Background Technology

[0002] Positive displacement micropumps are miniaturized positive displacement pumps. Their core working principle is the same as traditional positive displacement pumps: they utilize the minute deformation of piezoelectric ceramics when energized to lift or press the pump diaphragm, periodically changing the volume of the sealed working chamber to achieve liquid intake and discharge. However, due to the inherent brittleness of piezoelectric ceramics, their edges can be crushed during installation, as detailed below:

[0003] Among the existing published Chinese patents, the authorization announcement number is CN222228795U, and the patent name is: A micro pump. In this solution, the actuator and the second substrate are installed in an annular connector. The actuator is equivalent to a piezoelectric ceramic. The annular connector has an opening for adjusting the size of the outer circumference of the annular connector. The annular connector is adjusted to adjust the locking degree of the actuator and the second substrate by contraction or expansion. This adjustment method can easily crush the corners of the actuator, thus limiting the use of this solution.

[0004] Therefore, the technical problem that this application needs to solve is: how to prevent the edges and corners of piezoelectric ceramics from being crushed during the installation process. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model proposes a piezoelectric ceramic mounting structure and its micropump, wherein the adjusting component is used to control the movement of the clamping component, and the piezoelectric ceramic is clamped by the clamping component. This solution can effectively prevent the edges of the piezoelectric ceramic from being crushed.

[0006] Specifically, this utility model proposes a piezoelectric ceramic mounting structure for mounting piezoelectric ceramics on a substrate of a micropump, including a clamping assembly for clamping the piezoelectric ceramics and the substrate.

[0007] One end of the substrate is provided with a receiving space, which is used for inserting and installing piezoelectric ceramics;

[0008] The clamping assembly includes a clamping component and an adjusting component, wherein the adjusting component is used to adjust the pressure exerted by the clamping component on the piezoelectric ceramic.

[0009] Preferably, the adjusting component is an adjusting screw.

[0010] Preferably, the receiving space is a plug-in interface, the clamping component is located in the plug-in interface, and the adjusting screw is installed in the threaded hole of the substrate, with the clamping component located between the piezoelectric ceramic and the adjusting screw.

[0011] Furthermore, the clamping component is a push plate.

[0012] Furthermore, the adjusting screw is located below the push plate.

[0013] Preferably, the clamping component has a mounting port for inserting and mounting the substrate and the piezoelectric ceramic, and the clamping component is provided with a threaded hole for mounting the adjusting screw. The substrate is located between the adjusting screw and the piezoelectric ceramic, and the adjusting screw is used to clamp the substrate.

[0014] Furthermore, the clamping component is a frame.

[0015] Furthermore, the accommodating space is a mounting groove, and the mounting groove is located at the upper end of the substrate. One end of the piezoelectric ceramic is located in the mounting groove, and the height of the piezoelectric ceramic is greater than the depth of the mounting groove.

[0016] In addition, this application also proposes a micropump, including the piezoelectric ceramic mounting structure described above, wherein the end of the piezoelectric ceramic away from the clamping assembly is mounted on the pump diaphragm of the micropump via a connector.

[0017] Preferably, the substrate also includes a base, the lower end of which is provided with an installation space for accommodating the base, and the base is fixed to the substrate by a threaded component.

[0018] Preferably, the threaded component is a screw, which passes through the substrate and the base from bottom to top.

[0019] Preferably, the connector is inserted into the piezoelectric ceramic.

[0020] Preferably, the connector is fixed to the pump diaphragm by dispensing adhesive.

[0021] Preferably, the connector has a plug-in socket, and the plug-in socket has a through-hole in the horizontal direction, the through-hole being used for plugging in and installing the piezoelectric ceramic.

[0022] The lower end of the connector is provided with a connecting part, which is fixed to the pump diaphragm by dispensing adhesive.

[0023] Preferably, the upper end of the plug-in is provided with the clamping arm, the end of the clamping arm away from the clamping assembly has a bent portion, the lower end of the bent portion has a curved surface, and the curved surface is used to press the piezoelectric ceramic downward.

[0024] Preferably, the inlet end of the through-hole is provided with a guide portion, which is a folded edge, for guiding the insertion direction of the piezoelectric ceramic.

[0025] Preferably, the connector includes a connecting plate and a vertical connector, the vertical connector is fixed to the lower end of the connecting plate, the connecting plate is fixed to the lower end face of the piezoelectric ceramic, and the vertical connector is fixedly connected to the pump diaphragm.

[0026] Furthermore, the connecting plate is fixed between the piezoelectric ceramics by dispensing adhesive, and the vertical connecting member is fixed to the pump diaphragm by dispensing adhesive.

[0027] Furthermore, the vertical connector is fixed between the connecting plates by one of the following methods: dispensing, welding, and riveting.

[0028] Furthermore, the vertical connector is a stud. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0030] Figure 1 This is a three-dimensional structural diagram of the micropump with a piezoelectric ceramic mounting structure in Example 2;

[0031] Figure 2 This is a schematic diagram of the internal structure of the micropump with piezoelectric ceramic mounting structure in Example 2;

[0032] Figure 3 yes Figure 2 Schematic diagram of the cross-sectional structure along the AA direction;

[0033] Figure 4 This is a three-dimensional structural diagram of the micropump with a piezoelectric ceramic mounting structure in Example 3;

[0034] Figure 5 This is a schematic diagram of the internal structure of the micropump with piezoelectric ceramic mounting structure in Example 3;

[0035] Figure 6 yes Figure 5 Schematic diagram of the cross-sectional structure in the middle BB direction;

[0036] Figure 7 This is a three-dimensional structural diagram of the connector in Example 4;

[0037] Figure 8 This is a top view of the connector in Embodiment 4.

[0038] Figure 9 yes Figure 8 A schematic diagram of the cross-sectional structure along the CC direction.

[0039] Figure 10This is a schematic diagram of the micropump in Example 5;

[0040] Figure 11 This is a three-dimensional structural diagram of the connector in Example 5.

[0041] The reference numerals used in the attached figures are as follows:

[0042] 11-Piezoelectric ceramic; 12-Substrate; 13-Adjusting screw; 14-Insertion interface; 15-Push plate; 16-Mounting port; 17-Frame; 18-Mounting groove; 19-Connector; 20-Allowing hole; 21-First clearance structure; 22-Second clearance structure; 23-Third clearance structure; 24-Pump chamber; 25-Pump diaphragm; 26-Base; 27-Insertion socket; 28-Through port; 29-Connecting part; 30-Clamping arm; 31-Bending part; 32-Curved surface; 33-Guide part; 34-Dispensing groove; 35-Vertical connector; 36-Connecting plate. Detailed Implementation

[0043] The technical solutions of this application will be further described below with reference to specific embodiments, but this application is not limited to these embodiments.

[0044] Example 1

[0045] like Figures 1 to 6 As shown, this embodiment proposes a piezoelectric ceramic mounting structure for mounting a piezoelectric ceramic 11 on a substrate 12 of a micropump, including a clamping assembly for clamping the piezoelectric ceramic 11 and the substrate 12.

[0046] One end of the substrate 12 is provided with a receiving space for horizontally inserting and mounting the piezoelectric ceramic 11;

[0047] The clamping assembly includes a clamping component and an adjusting component, which is used to adjust the pressure exerted by the clamping component on the piezoelectric ceramic 11. In this solution, the clamping component is used to clamp the piezoelectric ceramic 11 and the substrate 12, thereby preventing displacement between the piezoelectric ceramic 11 and the substrate 12.

[0048] The technical advantage of this solution is that the adjusting component is used to control the movement of the pressing component, and the pressing component is used to press the piezoelectric ceramic 11. This solution can effectively prevent the edge of the piezoelectric ceramic 11 from being crushed.

[0049] Furthermore, the substrate 12 and the piezoelectric ceramic 11 are arranged horizontally, with the piezoelectric ceramic 11 located above the substrate 12. One end of the substrate 12 has an upwardly extending protrusion, and the protrusion has a space for mounting and accommodating.

[0050] Furthermore, the piezoelectric ceramic 11 is in surface contact with the clamping component, and the piezoelectric ceramic 11 is in surface contact with the substrate 12. This increases the force-bearing area of ​​the piezoelectric ceramic 11 and prevents the edges of the piezoelectric ceramic 11 from being crushed.

[0051] Furthermore, the adjusting component is an adjusting screw 13. This design uses a threaded adjustment method to control the movement of the clamping component, which has the advantage of convenient adjustment.

[0052] Example 2

[0053] Example 2 refines the structure of the clamping assembly based on Example 1, and proposes a first specific implementation scheme, as follows:

[0054] like Figures 1 to 3 As shown, the accommodating space on the substrate 12 is an interface 14, which is used to simultaneously accommodate the piezoelectric ceramic 11 and the clamping component. The clamping component is located between the piezoelectric ceramic 11 and the adjusting screw 13, and the adjusting screw 13 is installed in the threaded hole of the substrate 12.

[0055] In this scheme, the clamping component is driven to move vertically by rotating the adjusting screw 13. During the movement, the clamping component gradually clamps the piezoelectric ceramic 11, thus realizing the clamping installation of the piezoelectric ceramic 11.

[0056] Furthermore, the clamping component is a push plate 15.

[0057] Furthermore, the adjusting screw 13 is located below the push plate 15. In this design, the adjusting screw 13 is installed from bottom to top, which allows the push plate 15 to better tighten the piezoelectric ceramic 11.

[0058] Furthermore, a first clearance structure 21 is provided at the corner of the connector 14 to prevent the edge of the piezoelectric ceramic 11 from being squeezed.

[0059] Example 3

[0060] Example 3 refines the structure of the clamping assembly based on Example 1, and proposes a second specific implementation scheme, as follows:

[0061] like Figures 4 to 6 As shown, the clamping component has a mounting port 16 for inserting and mounting the substrate 12 and the piezoelectric ceramic 11. The clamping component is provided with a threaded hole for mounting the adjusting screw 13. The substrate 12 is located between the adjusting screw 13 and the piezoelectric ceramic 11. The adjusting screw 13 is used to clamp the substrate 12.

[0062] In this scheme, when the adjusting screw 13 is tightened, the adjusting screw 13 moves continuously toward the substrate 12. When the adjusting screw 13 presses the substrate 12, it will pull the pressing component in the opposite direction. At this time, the pressing component has a movement trend opposite to that of the screw, which makes it easier for the pressing component to press the piezoelectric ceramic 11.

[0063] Furthermore, the substrate 12 has a clearance hole 20, the diameter of which is larger than the outer diameter of the adjusting screw 13, for the purpose of clearing the adjusting screw 13.

[0064] Furthermore, the clamping component is frame 17.

[0065] Furthermore, the accommodating space is a mounting groove 18, and the mounting groove 18 is located at the upper end of the substrate 12. One end of the piezoelectric ceramic 11 is located in the mounting groove 18, and the height of the piezoelectric ceramic 11 is greater than the depth of the mounting groove 18, which is used to form a second clearance structure 22 at the upper end of the substrate 12 to prevent the edge of the piezoelectric ceramic 11 from being squeezed.

[0066] Furthermore, a third clearance structure 23 is provided at the corner of the bottom of the mounting groove 18 to prevent the edge of the piezoelectric ceramic 11 from being squeezed.

[0067] Furthermore, the adjusting screw 13 is located below the substrate 12. In this design, the adjusting screw 13 is used to tighten the clamping component, which presses the piezoelectric ceramic 11 from top to bottom, thereby increasing the clamping force of the piezoelectric ceramic 11.

[0068] Furthermore, the bottom surface of the mounting groove 18 is provided with an adhesive dispensing groove 34, which is used to increase the connection strength between the piezoelectric ceramic and the base after adhesive dispensing.

[0069] Example 4

[0070] In addition, this application also proposes a micropump, such as Figures 1 to 9 As shown, the piezoelectric ceramic mounting structure includes those in Embodiments 1 to 3. One end of the piezoelectric ceramic 11 is connected to the substrate 12 via a clamping assembly, and the other end of the piezoelectric ceramic 11 is mounted on the pump diaphragm 25 of the micropump via a connector 19. The other end of the piezoelectric ceramic 11 is the end furthest from the clamping assembly.

[0071] In this application, the micropump is a piezoelectric positive displacement pump. The pumping principle of the micropump in this application is the same as in the prior art. Specifically, the piezoelectric ceramic 11 deforms after being energized to lift or press the pump diaphragm 25, thereby changing the volume of the pump chamber 24. The substrate 12 has a liquid inlet channel communicating with the pump chamber 24, and a one-way valve is installed in the liquid inlet channel to prevent liquid in the pump chamber 24 from flowing back out through the liquid inlet channel. A base 26 is fixed below the substrate 12, and the base 26 has a liquid outlet channel communicating with the pump chamber 24. A one-way valve is installed in the liquid outlet channel to prevent external liquid from flowing back into the pump chamber 24 through the liquid outlet channel. A pressure sensor is installed at the liquid outlet channel to detect the liquid outlet pressure of the micropump. This paragraph describes the prior art; some specific structures are not shown in the accompanying drawings, such as the liquid inlet channel, liquid outlet channel, and pressure sensor. For a more in-depth understanding of the working principle of micropumps, please refer to the publicly available information in the prior art; this application will not elaborate further.

[0072] Furthermore, the lower end of the substrate 12 is provided with an installation space for accommodating the base 26, and the base 26 is fixed to the substrate 12 by a threaded component. The threaded component is a screw, which passes through the substrate 12 and the base 26 from bottom to top.

[0073] Furthermore, the connector 19 is inserted into the piezoelectric ceramic 11 for assembly.

[0074] The connector 19 has a plug-in seat 27, in which a through-hole 28 is provided in the horizontal direction for plugging in and installing the piezoelectric ceramic 11. The lower end of the plug-in seat 27 has a connecting part 29, which is fixed on the pump diaphragm 25. The connecting part 29 can be fixed on the pump diaphragm 25 by dispensing adhesive.

[0075] Furthermore, such as Figures 7 to 9 As shown, the upper end of the plug-in 27 is provided with a clamping arm 30. The end of the clamping arm 30 away from the clamping assembly has a bent portion 31. The lower end of the bent portion 31 has a curved surface 32, which is used to press the piezoelectric ceramic 11 downward to prevent the piezoelectric ceramic 11 from breaking.

[0076] Furthermore, the inlet end of the through-port 28 is provided with a guide 33, which is a folded edge, so that the piezoelectric ceramic 11 can be more easily inserted and installed into the through-port 28.

[0077] Furthermore, there are two guide sections 33, located at the upper and lower ends of the through opening 28, respectively.

[0078] Example 5

[0079] like Figure 10 and Figure 11As shown, the difference between this embodiment and embodiment 4 is that the structure of the connector 19 has been changed.

[0080] The connector 19 includes a connecting plate 36 and a vertical connector 35. The vertical connector 35 is fixed to the lower end of the connecting plate 36, and the connecting plate 36 is fixed to the lower end face of the piezoelectric ceramic 11. The vertical connector 35 is fixedly connected to the pump diaphragm 25.

[0081] The connecting plate 36 is fixed between the piezoelectric ceramics 11 by adhesive dispensing, and the vertical connecting member 35 is fixed to the pump diaphragm 25 by adhesive dispensing. The vertical connecting member 35 is fixed between the connecting plates 36 by one of adhesive dispensing, welding, and riveting.

[0082] This solution has the advantages of easy installation and production benefits.

[0083] Furthermore, the connecting plate 36 is a sheet metal part.

[0084] Furthermore, the vertical connector 35 is a stud. The stud is threaded throughout, making it more securely fixed to the pump diaphragm 25 with adhesive. In addition, the stud has high rigidity, which can improve the transmission efficiency of the piezoelectric ceramic 11.

[0085] For those skilled in the art, various modifications and improvements can be made without departing from the inventive concept of this utility model, and these all fall within the protection scope of this utility model.

Claims

1. A piezoelectric ceramic mounting structure for mounting a piezoelectric ceramic (11) on a base plate (12) of a micropump, characterized by, Includes a clamping assembly for clamping the piezoelectric ceramic (11) and the substrate (12); One end of the substrate (12) is provided with a receiving space, which is used for inserting and installing piezoelectric ceramics (11); The clamping assembly includes a clamping component and an adjusting component, wherein the adjusting component is used to adjust the pressure exerted by the clamping component on the piezoelectric ceramic (11).

2. The piezoelectric ceramic mounting structure according to claim 1, characterized by The adjusting component is an adjusting screw (13).

3. The piezoelectric ceramic mounting structure according to claim 2, characterized by The accommodating space is a plug-in interface (14), the clamping component is located in the plug-in interface (14), and the adjusting screw (13) is installed in the threaded hole of the substrate (12). The clamping component is located between the piezoelectric ceramic (11) and the adjusting screw (13).

4. The piezoelectric ceramic mounting structure according to claim 3, characterized by The clamping component is a push plate (15).

5. The piezoelectric ceramic mounting structure according to claim 4, characterized by The adjusting screw (13) is located below the push plate (15).

6. The piezoelectric ceramic mounting structure according to claim 2, characterized by The clamping component has a mounting port (16) for inserting and mounting the substrate (12) and the piezoelectric ceramic (11). The clamping component is provided with a threaded hole for mounting the adjusting screw (13). The substrate (12) is located between the adjusting screw (13) and the piezoelectric ceramic (11). The adjusting screw (13) is used to clamp the substrate (12).

7. The piezoelectric ceramic mounting structure according to claim 6, characterized by The clamping component is a frame (17).

8. The piezoelectric ceramic mounting structure according to claim 7, characterized by The accommodating space is a mounting groove (18), and the mounting groove (18) is located at the upper end of the substrate (12). One end of the piezoelectric ceramic (11) is located in the mounting groove (18), and the height of the piezoelectric ceramic (11) is greater than the depth of the mounting groove (18).

9. A micropump characterized by The piezoelectric ceramic mounting structure includes any one of claims 1 to 8, wherein the end of the piezoelectric ceramic (11) away from the clamping assembly is mounted on the pump diaphragm (25) of the micropump via a connector (19).

10. The micropump of claim 9, wherein, It also includes a base (26), the lower end of the substrate (12) is provided with an installation space for accommodating the base (26), and the base (26) and the substrate (12) are fixed together by a threaded component.

11. The micropump of claim 10, wherein, The threaded component is a screw, which is inserted from bottom to top onto the base plate (12) and the base (26).

12. The micropump of claim 9, wherein, The connector (19) is inserted into the piezoelectric ceramic (11).

13. The micropump of claim 12, wherein, The connector (19) is fixed to the pump diaphragm (25) by dispensing adhesive.

14. The micropump of claim 12, wherein, The connector (19) has a plug-in socket (27), in which a through-hole (28) is provided in the horizontal direction, and the through-hole (28) is used for plugging in and installing the piezoelectric ceramic (11); The lower end of the plug-in (27) is provided with a connecting part (29), which is fixed to the pump diaphragm (25) by dispensing adhesive.

15. The micropump of claim 14, wherein, The upper end of the plug-in base (27) is provided with a clamping arm (30), and the end of the clamping arm (30) away from the clamping assembly has a bent portion (31). The lower end of the bent portion (31) has a curved surface (32), which is used to press the piezoelectric ceramic (11) downward.

16. The micropump of claim 14, wherein, The inlet end of the through-hole (28) is provided with a guide part (33), which is a folded edge and is used to guide the insertion direction of the piezoelectric ceramic (11).

17. The micropump of claim 9, wherein, The connector (19) includes a connecting plate (36) and a vertical connector (35). The vertical connector (35) is fixed to the lower end of the connecting plate (36), and the connecting plate (36) is fixed to the lower end face of the piezoelectric ceramic (11). The vertical connector (35) is fixedly connected to the pump diaphragm (25).

18. The micropump of claim 17, wherein, The connecting plate (36) is fixed between the piezoelectric ceramics (11) by dispensing adhesive, and the vertical connecting piece (35) is fixed to the pump diaphragm (25) by dispensing adhesive.

19. The micropump according to claim 18, characterized in that, The vertical connector (35) is fixed between the connecting plates (36) by one of the following methods: dispensing, welding, and riveting.

20. The micropump of claim 17, wherein, The vertical connector (35) is a stud.

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