A positive displacement micropump

Abstract

The application discloses a kind of positive displacement micropump, belong to positive displacement micropump technical field, including support structure, the support structure includes front support piece and rear support piece, the front support piece with the rear support piece is fixed connection;Pump body, the pump body is installed in the rear support piece;Piezoelectric ceramic, one end of piezoelectric ceramic is fixed on the front support piece by fastener, the other end is connected with the pump membrane of the pump body by connecting piece, the connecting piece drives the pump membrane movement of the pump body, to suck or discharge liquid of the pump body.The support structure of the positive displacement micropump of the application exists stronger rigidity, can effectively improve the mechanical transmission efficiency of piezoelectric ceramic, to improve the pumping efficiency and pumping precision of micropump, and the support structure is lightened, while meeting the transmission efficiency of piezoelectric ceramic, effectively reduce the weight of micropump.

Description

Technical Field

[0001] This invention belongs to the field of volumetric micropump technology, and particularly relates to a volumetric micropump. Background Technology

[0002] A pump is a device for transporting liquids. Micropump sensors based on MEMS technology (MEMS is an abbreviation for Micro-Electro-Mechanical System) have smaller size, lower cost, higher accuracy and reliability compared to traditional mechanical pumps. They can realize the injection of sustained-release or micro-volume liquids such as insulin, anesthetics, and analgesics, and are a very promising solution for micro-volume liquid injection.

[0003] Existing positive displacement micropumps have the following problems:

[0004] 1. Current volumetric micropumps still have the problem of taking up a lot of space, and the existing modules are made of alloy, making them unsuitable for portable applications;

[0005] 2. The existing volumetric micropumps have insufficient rigidity in their support structure. During the pumping process, the deformation displacement of the piezoelectric ceramic is absorbed by the support structure, resulting in low pumping efficiency and affecting pumping accuracy.

[0006] 3. The existing support structure of volumetric micropumps cannot be biocompatible coated due to the slender internal flow channels, which leads to biocompatibility issues during liquid flow and poses a safety risk. Summary of the Invention

[0007] This invention overcomes the shortcomings of the prior art and provides a volumetric micropump to solve the problems existing in the prior art.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is: a positive displacement micropump, comprising...

[0009] A support structure, comprising a front support member and a rear support member, wherein the front support member and the rear support member are fixedly connected;

[0010] Pump body, the pump body being installed within the rear support member;

[0011] The piezoelectric ceramic has one end fixed to the front support member by a fastener, and the other end connected to the pump diaphragm of the pump body by a connector. The connector drives the pump diaphragm of the pump body to move so as to draw in or discharge liquid from the pump body.

[0012] In a preferred embodiment of the present invention, a pressure plate is provided on the rear support member, and the pressure plate fixes and seals the pump body by means of a sealing gasket.

[0013] In a preferred embodiment of the present invention, the pump body is provided with an inlet and an outlet. When the pump diaphragm of the pump body is pressed down, the liquid is discharged through the outlet. When the pump diaphragm of the pump body is moved up, the liquid is introduced into the pump body through the inlet.

[0014] In a preferred embodiment of the present invention, an inlet needle is provided inside the pressure plate, and an outlet needle is provided inside the rear support member. The inlet needle is positioned corresponding to the inlet port, and the outlet needle is positioned corresponding to the outlet port.

[0015] In a preferred embodiment of the present invention, the front support and the rear support are metal or plastic parts, and both the front support and the rear support are biocompatible.

[0016] In a preferred embodiment of the present invention, when both the front support and the rear support are plastic parts, an insert is provided inside the front support.

[0017] In a preferred embodiment of the present invention, the support structure is provided with a weight-reducing groove to reduce the weight of the support structure.

[0018] In a preferred embodiment of the present invention, the front support member and the rear support member are integrally formed or connected together.

[0019] This invention addresses the shortcomings of the prior art and has the following beneficial effects:

[0020] 1. The volumetric micropump of the present invention has a smaller overall volume and lighter weight, and is more widely applicable in practical use;

[0021] 2. The support structure of the volumetric micropump of the present invention has stronger rigidity, which can effectively improve the mechanical transmission efficiency of the piezoelectric ceramic, thereby improving the pumping efficiency and pumping accuracy of the micropump. Furthermore, the weight of the support structure is reduced, which effectively reduces the weight of the micropump while meeting the transmission efficiency requirements of the piezoelectric ceramic.

[0022] 3. The liquid flow channel of the volumetric micropump of the present invention is made of biocompatible plastic or metal parts, which effectively avoids safety problems that may occur during the application of the micropump. Attached Figure Description

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 This is a schematic diagram of the support structure according to Embodiment 1 of the present invention;

[0026] Figure 3This is a schematic diagram of the support structure according to Embodiment 2 of the present invention;

[0027] Figure 4 This is a schematic diagram of the support structure according to Embodiment 3 of the present invention;

[0028] Figure 5 This is a schematic diagram of the support structure according to Embodiment 4 of the present invention;

[0029] Figure 6 This is a schematic diagram of the support structure in Embodiment 51 of the present invention;

[0030] Figure 7 This is a schematic diagram of another support structure in Embodiment 5 of the present invention;

[0031] Figure 8 This is a schematic diagram of the support structure according to Embodiment Six of the present invention;

[0032] Figure 9 for Figure 8 A sectional view;

[0033] Figure 10 This is a schematic diagram of the support structure according to Embodiment Seven of the present invention;

[0034] In the diagram: 10, Support structure; 11, Front support component; 12, Rear support component; 121, Pump body mounting cavity; 101, Weight reduction groove; 20, Pump body; 21, Inlet needle; 22, Outlet needle; 30, Piezoelectric ceramic; 40, Fastener; 50, Connector; 60, Pressure plate; 70, Embedded component; 80, Inlet needle insert. Detailed Implementation

[0035] The following drawings will disclose several embodiments of the present invention. For clarity, many physical details will be described in the following description. However, it should be understood that these physical details are not intended to limit the invention. That is, in some embodiments of the invention, these physical details are not essential. Furthermore, for the sake of simplicity, some conventional structures and components will be shown in the drawings in a simple schematic manner.

[0036] Furthermore, in this invention, the use of terms such as "first" and "second" is for descriptive purposes only and does not specifically refer to any order or sequence, nor is it intended to limit the invention. They are merely used to distinguish components or operations described using the same technical terms, and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of various embodiments can be combined with each other, but only if they are feasible for those skilled in the art. If a combination of technical solutions is contradictory or impossible to implement, such a combination should be considered nonexistent and not within the scope of protection claimed by this invention.

[0037] Example 1

[0038] This embodiment provides a volumetric micropump with a support structure 10 that has stronger rigidity, which can effectively improve the mechanical transmission efficiency of the piezoelectric ceramic 30, thereby improving the pumping efficiency and pumping accuracy of the micropump. Furthermore, the support structure 10 is weight-reduced, which effectively reduces the weight of the micropump while meeting the transmission efficiency requirements of the piezoelectric ceramic 30.

[0039] Combination Figure 1 and Figure 2 As shown, the volumetric micropump of this embodiment includes a support structure 10, a pump body 20, and a piezoelectric ceramic 30. The pump body 20 is installed in the support structure 10. The piezoelectric ceramic 30 presses the connector 50, and the movement drives the pump diaphragm of the pump body 20 to move, thereby realizing the liquid inlet and liquid outlet operation of the pump body 20.

[0040] In this embodiment, the support structure 10 includes a front support member 11 and a rear support member 12. The front support member 11 and the rear support member 12 are integrally formed. Both the front support member 11 and the rear support member 12 are stainless steel structural parts, which can effectively reduce the weight of the support structure 10 while ensuring rigidity. Both the front support member 11 and the rear support member 12 are provided with weight reduction grooves 101, which can further reduce the weight of the support structure 10, thereby reducing the weight of the entire micropump.

[0041] Furthermore, in this embodiment, the front support member 11 and the rear support member 12 are integrally formed, the pump body 20 is installed in the rear support member 12, and a pressure plate 60 is provided on the rear support member 12 to fix and seal the pump body 20. In this embodiment, the rear support member 12 is provided with a pump body mounting cavity 121. After the pump body 20 is placed in the pump body mounting cavity 121, the pressure plate 60 fixes and seals the pump body 20 through a sealing gasket. The rear support member 12 is provided with a liquid flow channel (not shown in the figure) to discharge liquid.

[0042] In this embodiment, the pump body 20 is provided with an inlet and an outlet. When the pump diaphragm of the pump body 20 is pressed down, the liquid is discharged through the outlet. When the pump diaphragm of the pump body 20 is moved up, the liquid is introduced into the pump body 20 through the inlet. An inlet needle 21 is provided in the pressure plate 60, and an outlet needle 22 is provided in the rear support member 12. The inlet needle 22 corresponds to the position of the inlet, and the outlet needle 22 corresponds to the position of the outlet.

[0043] like Figure 1 As shown, in this embodiment, one end of the piezoelectric ceramic 30 is fixed to the front support member 11 by a fastener 40, and the other end is connected to the pump diaphragm of the pump body 20 by a connector 50. The connector 50 drives the pump diaphragm of the pump body 20 to move, so as to draw in or discharge liquid from the pump body 20. In this embodiment, one end of the piezoelectric ceramic 30 is fixed to the front support member 11, and the other end is connected to the pump diaphragm of the pump body 20 by a connector 50. The piezoelectric ceramic 30 is connected to the pump diaphragm of the pump body 20 by the connector 50 and moves up and down to make the pump body 20 draw in and discharge liquid. Liquid is introduced into the pump body 20 by the inlet needle 21 and liquid is discharged by the outlet needle 22.

[0044] In practical use, the front support 11 and the rear support 12 of the volumetric micropump in this embodiment are both stainless steel structural parts, and their rigidity can meet the requirements of the piezoelectric ceramic 30, so that the piezoelectric ceramic 30 can achieve stable transmission efficiency, improve the pumping efficiency and pumping accuracy of the pump body 20, and the front support 11 and the rear support 12 are provided with weight reduction grooves 101, which can further reduce the weight of the volumetric micropump, so that the volume and weight of the volumetric micropump can meet the usage requirements.

[0045] Example 2

[0046] Combination Figure 1 and Figure 3 As shown, the difference between this embodiment and Embodiment 1 is that the front support 11 and the rear support 12 in this embodiment are both aluminum alloy structural parts. The rear support 12 is provided with a weight reduction groove 101. The use of aluminum alloy as the front support 11 and the rear support 12 ensures that its rigidity meets the requirements for the use of piezoelectric ceramic 30, enabling the piezoelectric ceramic 30 to achieve stable transmission efficiency, improving the pumping efficiency and pumping accuracy of the pump body 20. Furthermore, the weight reduction groove 101 on the rear support 12 can further reduce the weight of the volumetric micropump, so that the volume and weight of the volumetric micropump can meet the usage requirements.

[0047] Example 3

[0048] Combination Figure 1 and Figure 4 As shown, the difference between this embodiment and embodiment two is that the rear support member 12 in this embodiment is provided with two weight reduction grooves 101. One weight reduction groove 101 is located directly below the pump body mounting cavity 121, and the other weight reduction groove 101 is located on the side of the rear support member 12.

[0049] Example 4

[0050] Combination Figure 1 and Figure 5 As shown, the difference between this embodiment and Embodiment 1 is that the front support 11 is an aluminum alloy part, and the front support 11 has a biocompatible coating, so that the liquid flowing through it meets the requirements of biocompatibility. The rear support 12 is a biocompatible plastic part. The front support 11 and the rear support 12 are connected by hot riveting welding technology or bolt fixing. A weight reduction groove 101 is provided on the front support 11. The support structure 10 can meet the transmission efficiency of the piezoelectric ceramic 30 while greatly reducing the weight of the support structure 10, which meets the requirements of use.

[0051] Example 5

[0052] Combination Figure 1 , Figure 6 as well as Figure 7 As shown, the difference between this embodiment and embodiment four is that neither the front support member 11 nor the rear support member 12 is provided with a weight reduction groove 101. While the support structure 10 basically meets the transmission efficiency of the piezoelectric ceramic 30, the weight of the support structure 10 is reduced to meet the requirements of use.

[0053] Example 6

[0054] Combination Figure 1 , Figure 8 as well as Figure 9 As shown, the difference between this embodiment and Embodiment 1 is that the front support 11 and the rear support 12 are both plastic parts, and the front support 11 is provided with an insert 70. The insert 70 and the pressure plate 60 are both stainless steel parts. While ensuring the rigidity of the support structure 10, the weight of the support structure 10 is reduced. The liquid inlet needle 21 is welded to the pressure plate 60, making the structure of the volumetric micropump more compact and smaller in size.

[0055] Example 7

[0056] Combination Figure 1 and Figure 10As shown, the difference between this embodiment and Embodiment 1 is that the front support 11 is an aluminum alloy part, and the front support 11 has a biocompatible coating, so the liquid flow part meets the biocompatibility requirements. The rear support 12 is a biocompatible plastic part. The front support 11 and the rear support 12 are connected by bolts, or by hot riveting welding. A liquid inlet needle insert 80 is provided on the front support 11. The liquid inlet needle insert 80 is a biocompatible plastic part and is installed on the front support 11 by hot riveting, which is conducive to the stable installation of the liquid inlet needle 21. The rear support 12 has a liquid flow channel. In this embodiment, both the rear support 12 and the liquid inlet needle insert 80 are biocompatible plastic parts, and the front support 11 can be coated with a biocompatible coating, so that the liquid flow part meets the biocompatibility requirements.

[0057] While the invention has been described above with reference to various embodiments, it should be understood that many changes and modifications can be made without departing from the scope of the invention. That is, the methods, systems, or devices discussed above are merely examples. Various configurations can be appropriately omitted, substituted, or added to various processes or components. For example, in alternative configurations, methods can be performed in a different order than described, and / or various stages can be added, omitted, and / or combined. Moreover, features described with respect to certain configurations can be combined in various other configurations. Different aspects and elements of the configuration can be combined in a similar manner. Furthermore, as technology develops, many elements are merely examples and do not limit the scope of this disclosure or the claims.

[0058] Specific details are provided in the specification to offer a thorough understanding of exemplary configurations, including implementations. However, configurations can be practiced without these specific details; for example, well-known circuits, processes, algorithms, structures, and techniques have been shown without unnecessary detail to avoid obscuring the configuration. This description provides only exemplary configurations and does not limit the scope, applicability, or configuration of the claims. Rather, the foregoing description of the configurations will provide those skilled in the art with an enabling description for implementing the described techniques. Various changes can be made to the function and arrangement of the elements without departing from the spirit or scope of this disclosure.

[0059] Furthermore, although each operation can be described as a sequential process, many operations can be executed in parallel or simultaneously. Additionally, the order of operations can be rearranged. A process may have additional steps. Moreover, examples of methods can be implemented using hardware, software, firmware, middleware, code, hardware description languages, or any combination thereof. When implemented in software, firmware, middleware, or code, the program code or code segments used to perform the necessary tasks can be stored in a non-transitory computer-readable medium such as a storage medium and executed by a processor.

[0060] In summary, the above detailed description is intended to be exemplary rather than limiting, and it should be understood that the claims (including all equivalents) are intended to define the spirit and scope of the invention. These embodiments should be understood as illustrative only and not as limiting the scope of protection of the invention. After reading this description, those skilled in the art can make various alterations or modifications to the invention, and these equivalent changes and modifications also fall within the scope defined by the claims.

Claims

1. A positive displacement micropump, characterized in that, include A support structure (10) includes a front support member (11) and a rear support member (12), wherein the front support member (11) and the rear support member (12) are fixedly connected. Pump body (20), the pump body (20) is installed inside the rear support member (12); A piezoelectric ceramic (30) is fixed at one end to the front support (11) by a fastener (40), and at the other end is connected to the pump diaphragm of the pump body (20) by a connector (50). The connector (50) drives the pump diaphragm of the pump body (20) to move so as to draw in or discharge liquid from the pump body (20).

2. The positive displacement micropump according to claim 1, characterized in that, A pressure plate (60) is provided on the rear support member (12), and the pressure plate (60) fixes and seals the pump body (20) through a sealing gasket.

3. A positive displacement micropump according to claim 2, characterized in that, The pump body (20) is provided with an inlet and an outlet. When the pump diaphragm of the pump body (20) is pressed down, the liquid is discharged through the outlet. When the pump diaphragm of the pump body (20) is moved up, the liquid is introduced into the pump body (20) through the inlet.

4. A positive displacement micropump according to claim 3, characterized in that, The pressure plate (60) is provided with an inlet needle (21), and the rear support member (12) is provided with an outlet needle (22). The inlet needle (21) corresponds to the position of the inlet, and the outlet needle (22) corresponds to the position of the outlet.

5. A positive displacement micropump according to claim 1, characterized in that, The front support (11) and the rear support (12) are made of metal or plastic, and both the front support (11) and the rear support (12) are biocompatible.

6. A positive displacement micropump according to claim 5, characterized in that, When both the front support member (11) and the rear support member (12) are plastic parts, an insert (70) is provided inside the front support member (11).

7. A positive displacement micropump according to claim 1, characterized in that, The support structure (10) is provided with a weight reduction groove (101) to reduce the weight of the support structure (10).

8. A positive displacement micropump according to claim 1, characterized in that, The front support member (11) and the rear support member (12) are integrally formed or connected together.

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