Microfluidic jetting valve

Abstract

The present application discloses a kind of micro-fluid ejection valve, comprising: shell, firing pin, capillary and piezoelectric ceramic block, the shell has a containing cavity and the first through hole in end face and is communicated with containing cavity, piezoelectric ceramic block is located in containing cavity, the end of the firing pin embedded in the first through hole is located in containing cavity, and a elastic mechanism is arranged between the end of the firing pin located in containing cavity and through hole, the left end face of shell has a screw hole communicated with containing cavity, one end of a fine adjustment bolt is screwed into the screw hole of shell and contacts with the left end of piezoelectric ceramic block, a left support block is installed on the right end face of shell, a right support block is installed on the side away from shell of left support block, the upper part of left support block has a left protrusion, the lower part of right support block has a right protrusion, the left protrusion of left support block is provided with a wide channel, and the capillary is composed of thick capillary sub-tube and thin capillary sub-tube.The present application improves the universality and liquid output precision of ejection valve while facilitating quick disassembly and maintenance and improving maintenance efficiency.

Description

Technical Field

[0001] This invention relates to a jet valve, belonging to the field of microdroplet jetting technology. Background Technology

[0002] In recent years, the technology in the field of micro-engineering has developed rapidly. Due to the continuous improvement and development of various ultra-precision micro-machining technologies, the size of precision components has become smaller and smaller. Piezoelectric actuation-based micro-droplet jetting mechanisms are widely used in the fields of materials and chemical engineering, electronic products, and microelectromechanical systems manufacturing, mainly to realize the functions of jetting and controlling tiny droplets.

[0003] Current biomedical liquid detection methods are slow, the volume of liquid being detected is difficult to control, and capillary tubes used in medicine are disposable consumables to avoid cross-interference, requiring frequent replacement, which is inconvenient each time, resulting in low efficiency in liquid detection. Summary of the Invention

[0004] The purpose of this invention is to provide a microfluidic jet valve that is convenient for quick disassembly and maintenance, improving maintenance efficiency. It also facilitates the removal and replacement of the fine capillary tube while retaining the coarse capillary tube, avoiding the reuse of the same fine capillary tube, and improving the convenience and accuracy of installation.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is: a microfluidic jet valve, comprising: a housing, a striking pin, a capillary tube, and a piezoelectric ceramic block. The housing has a receiving cavity and a first through hole located on the end face and communicating with the receiving cavity. The piezoelectric ceramic block is located in the receiving cavity. One end of the striking pin, which is embedded in the first through hole, is located in the receiving cavity, and the other end is in contact with the capillary tube. An elastic mechanism is provided between the end of the striking pin located in the receiving cavity and the through hole.

[0006] The accommodating cavity has a left limiting block and a right limiting block located on both sides of the piezoelectric ceramic block. The left end face of the housing has a screw hole communicating with the accommodating cavity. One end of a fine-adjusting bolt is screwed into the screw hole of the housing and contacts the left limiting block located on one side of the piezoelectric ceramic block.

[0007] A left support block is installed on the right end face of the housing. A right support block is installed on the side of the left support block opposite to the housing. The left support block has a left protrusion at the top and the right support block has a right protrusion at the bottom. The bottom surface of the left protrusion of the left support block contacts the top surface of the right protrusion of the right support block. The left protrusion of the left support block has a wide channel. The lower part of the left support block and the right protrusion of the right support block have left and right grooves located directly below the wide channel, respectively.

[0008] The capillary is composed of a coarse capillary tube and a fine capillary tube connected together. The coarse capillary tube is located in the wide channel of the left convex part, and the fine capillary tube is located in the left groove of the left support block and the right groove of the right support block. The other end of the firing pin is embedded in the second through hole at the bottom of the left support block and contacts the fine capillary tube located in the left groove and the right groove.

[0009] The following are further improvements to the above technical solution:

[0010] 1. In the above scheme, the piezoelectric ceramic block further includes a plurality of ceramic substrates stacked along the direction of the firing pin.

[0011] 2. In the above scheme, the elastic mechanism is mounted on the firing pin.

[0012] 3. In the above scheme, the heights of the left limiting block and the right limiting block are equal.

[0013] 4. In the above scheme, the two ends of the piezoelectric ceramic block are respectively embedded in the grooves of the left limiting block and the right limiting block.

[0014] 5. In the above scheme, the height of the left convex part is less than the height of the right convex part.

[0015] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0016] 1. The microfluidic jet valve of the present invention has a piezoelectric ceramic block located in the accommodating cavity. One end of the striking pin embedded in the first through hole is located in the accommodating cavity, and the other end is in contact with the capillary. An elastic mechanism is provided between the end of the striking pin located in the accommodating cavity and the through hole, which not only facilitates quick disassembly and maintenance and improves maintenance efficiency, but also ensures that the force of each impact is consistent, thus guaranteeing the stability and consistency of the liquid dispensing effect. In addition, there is a screw hole on the left end face of the housing that communicates with the accommodating cavity. One end of a fine-adjusting bolt is screwed into the screw hole of the housing and contacts the left limiting block on one side of the piezoelectric ceramic block, which can adjust the size of the liquid droplets, thereby improving the versatility and liquid dispensing accuracy of the jet valve.

[0017] 2. The microfluidic jet valve of the present invention has a wide channel on the left convex part of the left support block. The lower part of the left support block and the right convex part of the right support block have left and right grooves respectively located directly below the wide channel. The capillary is composed of a coarse capillary tube and a fine capillary tube connected together. The coarse capillary tube is located in the wide channel of the left convex part, and the fine capillary tube is located in the left groove of the left support block and the right groove of the right support block. The other end of the striker is embedded in the second through hole in the lower part of the left support block and contacts the fine capillary tube located in the left and right grooves. This facilitates the removal and replacement of the fine capillary tube while retaining the coarse capillary tube, avoiding the reuse of the same fine capillary tube and the resulting cross-contamination between different liquids. It also facilitates the positioning of the capillary tube containing the coarse capillary tube during installation before installing the right support block, improving the convenience and accuracy of installation. Attached Figure Description

[0018] Appendix Figure 1 This is a schematic diagram of the overall structure of the microfluidic jet valve of the present invention;

[0019] Appendix Figure 2 This is an exploded structural diagram of the microfluidic jet valve of the present invention;

[0020] Appendix Figure 3 This is a partial structural schematic diagram of the microfluidic jet valve of the present invention.

[0021] In the above attached figures: 1. Housing; 2. Strike pin; 3. Capillary tube; 31. Coarse capillary tube; 32. Fine capillary tube; 4. Piezoelectric ceramic block; 41. Ceramic substrate; 5. Receiving cavity; 6. First through hole; 7. Elastic mechanism; 8. Left limiting block; 9. Right limiting block; 10. Screw hole; 11. Fine adjustment bolt; 12. Left support block; 121. Left groove; 122. Left protrusion; 13. Right support block; 131. Right groove; 132. Right protrusion; 14. Wide channel; 15. Second through hole. Detailed Implementation

[0022] In the description of this patent, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this patent based on the specific circumstances.

[0023] Example 1: A microfluidic jet valve includes: a housing 1, a striking pin 2, a capillary tube 3, and a piezoelectric ceramic block 4. The housing 1 has a receiving cavity 5 and a first through hole 6 located on the end face and communicating with the receiving cavity 5. The piezoelectric ceramic block 4 is located in the receiving cavity 5. One end of the striking pin 2, which is embedded in the first through hole 6, is located in the receiving cavity 5, and the other end is in contact with the capillary tube 3. An elastic mechanism 7 is provided between the end of the striking pin 2 located in the receiving cavity 5 and the through hole.

[0024] The accommodating cavity 5 has a left limiting block 8 and a right limiting block 9 located on both sides of the piezoelectric ceramic block 4. The left end face of the housing 1 has a screw hole 10 communicating with the accommodating cavity 5. One end of a fine-adjusting bolt 11 is screwed into the screw hole 10 of the housing 1 and contacts the left limiting block 8 located on one side of the piezoelectric ceramic block 4.

[0025] A left support block 12 is installed on the right end face of the housing 1. A right support block 13 is installed on the side of the left support block 12 opposite to the housing 1. The left support block 12 has a left protrusion 122 on its upper part, and the right support block 13 has a right protrusion 132 on its lower part. The bottom surface of the left protrusion 122 of the left support block 12 contacts the top surface of the right protrusion 132 of the right support block 13. The left protrusion 122 of the left support block 12 has a wide channel 14. The lower part of the left support block 12 and the right protrusion 132 of the right support block 13 have a left groove 121 and a right groove 131 located directly below the wide channel 14, respectively.

[0026] The capillary tube 3 is composed of a coarse capillary tube 31 and a fine capillary tube 32 connected together. The coarse capillary tube 31 is located in the wide channel 14 of the left protrusion 122, and the fine capillary tube 32 is located in the left groove 121 of the left support block 12 and the right groove 131 of the right support block 13. The other end of the firing pin 2 is embedded in the second through hole 15 at the lower part of the left support block 12 and contacts the fine capillary tube 32 located in the left groove 121 and the right groove 131.

[0027] The heights of the left limiting block 8 and the right limiting block 9 are equal.

[0028] The two ends of the piezoelectric ceramic block 4 are respectively embedded in the grooves of the left limiting block 8 and the right limiting block 9.

[0029] The height of the left convex part 122 is less than the height of the right convex part 132.

[0030] Example 2: A microfluidic jet valve includes: a housing 1, a striking pin 2, a capillary tube 3, and a piezoelectric ceramic block 4. The housing 1 has a receiving cavity 5 and a first through hole 6 located on the end face and communicating with the receiving cavity 5. The piezoelectric ceramic block 4 is located in the receiving cavity 5. One end of the striking pin 2, which is embedded in the first through hole 6, is located in the receiving cavity 5, and the other end is in contact with the capillary tube 3. An elastic mechanism 7 is provided between the end of the striking pin 2 located in the receiving cavity 5 and the through hole.

[0031] The accommodating cavity 5 has a left limiting block 8 and a right limiting block 9 located on both sides of the piezoelectric ceramic block 4. The left end face of the housing 1 has a screw hole 10 communicating with the accommodating cavity 5. One end of a fine-adjusting bolt 11 is screwed into the screw hole 10 of the housing 1 and contacts the left limiting block 8 located on one side of the piezoelectric ceramic block 4.

[0032] A left support block 12 is installed on the right end face of the housing 1. A right support block 13 is installed on the side of the left support block 12 opposite to the housing 1. The left support block 12 has a left protrusion 122 on its upper part, and the right support block 13 has a right protrusion 132 on its lower part. The bottom surface of the left protrusion 122 of the left support block 12 contacts the top surface of the right protrusion 132 of the right support block 13. The left protrusion 122 of the left support block 12 has a wide channel 14. The lower part of the left support block 12 and the right protrusion 132 of the right support block 13 have a left groove 121 and a right groove 131 located directly below the wide channel 14, respectively.

[0033] The capillary tube 3 is composed of a coarse capillary tube 31 and a fine capillary tube 32 connected together. The coarse capillary tube 31 is located in the wide channel 14 of the left protrusion 122, and the fine capillary tube 32 is located in the left groove 121 of the left support block 12 and the right groove 131 of the right support block 13. The other end of the firing pin 2 is embedded in the second through hole 15 at the lower part of the left support block 12 and contacts the fine capillary tube 32 located in the left groove 121 and the right groove 131.

[0034] The aforementioned accommodating cavity 5 has a left limiting block 8 and a right limiting block 9 located on both sides of the piezoelectric ceramic block 4, so that one end of the ejector pin 2 contacts the right limiting block 9 located on one side of the piezoelectric ceramic block 4. The aforementioned piezoelectric ceramic block 4 further includes a plurality of ceramic substrates 41 stacked along the direction of the ejector pin 2, which not only extends the overall service life of the injection valve, but also improves the droplet ejection speed and liquid discharge frequency, thereby improving working efficiency.

[0035] The aforementioned elastic mechanism 7 is mounted on the firing pin 2.

[0036] The heights of the left limiting block 8 and the right limiting block 9 are equal.

[0037] The two ends of the piezoelectric ceramic block 4 are respectively embedded in the grooves of the left limiting block 8 and the right limiting block 9.

[0038] When the above-mentioned microfluidic jet valve is used, its housing has a receiving cavity and a first through hole located on the end face and communicating with the receiving cavity. The piezoelectric ceramic block is located in the receiving cavity. One end of the impact pin embedded in the first through hole is located in the receiving cavity, and the other end is in contact with the capillary. An elastic mechanism is provided between the end of the impact pin located in the receiving cavity and the through hole. This facilitates quick disassembly and maintenance, improves maintenance efficiency, and ensures that the force of each impact is consistent, thus guaranteeing the stability and consistency of the liquid dispensing effect.

[0039] In addition, there is a screw hole on the left end of the housing that communicates with the accommodating cavity. One end of a fine-adjusting bolt is screwed into the screw hole of the housing and contacts the left limit block on one side of the piezoelectric ceramic block. This not only facilitates quick disassembly and maintenance and improves maintenance efficiency, but also allows adjustment of the size of the liquid droplets, thereby improving the versatility and liquid discharge accuracy of the injection valve.

[0040] Furthermore, a wide channel is opened on the left convex part of the left support block. The lower part of the left support block and the right convex part of the right support block are respectively opened with a left groove and a right groove located directly below the wide channel. The capillary is composed of a coarse capillary tube and a fine capillary tube connected together. The coarse capillary tube is located in the wide channel of the left convex part, and the fine capillary tube is located in the left groove of the left support block and the right groove of the right support block. The other end of the firing pin is embedded in the second through hole in the lower part of the left support block and contacts the fine capillary tube located in the left groove and the right groove. This not only facilitates the removal and replacement of the fine capillary tube while retaining the coarse capillary tube, avoiding the reuse of the same fine capillary tube and the resulting cross-contamination between different liquids, but also facilitates the positioning of the capillary tube containing the coarse capillary tube during installation before installing the right support block, thus improving the convenience and accuracy of installation.

[0041] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A microfluidic injection valve, characterized in that: include: The shell (1), the firing pin (2), the capillary tube (3) and the piezoelectric ceramic block (4) are provided. The shell (1) has a cavity (5) and a first through hole (6) located on the end face and communicating with the cavity (5). The piezoelectric ceramic block (4) is located in the cavity (5). One end of the firing pin (2) embedded in the first through hole (6) is located in the cavity (5) and the other end is in contact with the capillary tube (3). An elastic mechanism (7) is provided between the end of the firing pin (2) located in the cavity (5) and the first through hole (6). The cavity (5) has a left limiting block (8) and a right limiting block (9) located on both sides of the piezoelectric ceramic block (4). The left end face of the housing (1) has a screw hole (10) communicating with the cavity (5). One end of a fine-tuning bolt (11) is screwed into the screw hole (10) of the housing (1) and contacts the left limiting block (8) located on one side of the piezoelectric ceramic block (4). A left support block (12) is installed on the right end face of the housing (1). A right support block (13) is installed on the side of the left support block (12) opposite to the housing (1). The upper part of the left support block (12) has a left protrusion (122), and the lower part of the right support block (13) has a right protrusion (132). The bottom surface of the left protrusion (122) of the left support block (12) is in contact with the top surface of the right protrusion (132) of the right support block (13). The left protrusion (122) of the left support block (12) has a wide channel (14). The lower part of the left support block (12) and the right protrusion (132) of the right support block (13) have left groove (121) and right groove (131) located directly below the wide channel (14), respectively. The capillary (3) is composed of a coarse capillary tube (31) and a fine capillary tube (32) connected together. The coarse capillary tube (31) is located in the wide channel (14) of the left convex part (122). The fine capillary tube (32) is located in the left groove (121) of the left support block (12) and the right groove (131) of the right support block (13). The other end of the firing pin (2) is embedded in the second through hole (15) at the lower part of the left support block (12) and contacts the fine capillary tube (32) located in the left groove (121) and the right groove (131).

2. The microfluidic injection valve according to claim 1, characterized in that: The piezoelectric ceramic block (4) further includes a plurality of ceramic substrates (41) stacked along the direction of the striker (2).

3. The microfluidic injection valve according to claim 1 or 2, characterized in that: The elastic mechanism (7) is fitted onto the firing pin (2).

4. The microfluidic injection valve according to claim 1, characterized in that: The left limiting block (8) and the right limiting block (9) have the same height.

5. The microfluidic injection valve according to claim 1, characterized in that: The piezoelectric ceramic block (4) is embedded in the grooves of the left limiting block (8) and the right limiting block (9) at both ends.

6. The microfluidic injection valve according to claim 1, characterized in that: The height of the left convex part (122) is less than the height of the right convex part (132).

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