阅读说明：本技术 一种3d打印制作的可拼接气动稳流微阀 (Splicing pneumatic steady-flow micro valve manufactured by 3D printing ) 是由 张艳 江源 陈云飞 田云 陈凯 于 2020-12-07 设计创作，主要内容包括：本发明提供了一种3D打印制作的可拼接气动稳流微阀,包括下流道块、隔膜和上流道块,所述隔膜密封连接于所述下流道块底面与所述上流道块顶面之间；所述下流道块的顶面设有进流腔、与进流腔连通的入流腔、与入流腔连通的插头；所述上流道块的底面设有与所述插头连通的小凹槽、与小凹槽连通且与所述进流腔对应的反馈腔；所述进流腔与外部流体源连通,所述反馈腔通过流道与外部连通,当进入进流腔或反馈腔的流体压力波动时,所述进流腔与所述反馈腔之间的所述隔膜发生形变,能消除流道入口压力变化所带来的流量波动,保证流量的稳定性,提高了微阀的流量稳定性控制能力。(The invention provides a splicing pneumatic steady-flow micro valve manufactured by 3D printing, which comprises a lower runner block, a diaphragm and an upper runner block, wherein the diaphragm is connected between the bottom surface of the lower runner block and the top surface of the upper runner block in a sealing manner; the top surface of the lower runner block is provided with a flow inlet cavity, a flow inlet cavity communicated with the flow inlet cavity and a plug communicated with the flow inlet cavity; the bottom surface of the upper runner block is provided with a small groove communicated with the plug and a feedback cavity communicated with the small groove and corresponding to the inflow cavity; the inflow cavity is communicated with an external fluid source, the feedback cavity is communicated with the outside through the flow channel, when the fluid pressure entering the inflow cavity or the feedback cavity fluctuates, the diaphragm between the inflow cavity and the feedback cavity deforms, the flow fluctuation caused by the change of the pressure at the inlet of the flow channel can be eliminated, the stability of the flow is ensured, and the flow stability control capability of the micro valve is improved.)

1. The splicing pneumatic steady flow micro valve manufactured by 3D printing is characterized by comprising a lower flow channel block (100), a diaphragm (200) and an upper flow channel block (300), wherein the diaphragm (200) is connected between the bottom surface of the lower flow channel block (100) and the top surface of the upper flow channel block (300) in a sealing manner;

the top surface of the lower runner block (100) is provided with an inflow cavity (106), an inflow cavity (108) communicated with the inflow cavity (106) and a plug (104) communicated with the inflow cavity (108);

the bottom surface of the upper runner block (300) is provided with a small groove (307) communicated with the plug (104) and a feedback cavity (302) communicated with the small groove (307) and corresponding to the inflow cavity (106); the inflow cavity (106) is communicated with an external fluid source, the feedback cavity (302) is communicated with the outside through a flow passage, and when the fluid entering the inflow cavity (106) or the feedback cavity (302) fluctuates, the diaphragm (200) between the inflow cavity (106) and the feedback cavity (302) deforms, so that the flow fluctuation is reduced.

2. The splicing pneumatic steady flow micro valve manufactured by 3D printing is characterized in that a power cavity (303) corresponding to the inflow cavity (108) is further arranged on the bottom surface of the upper flow channel block (300), the power cavity (303) is communicated with an external fluid source, and the flow area of the outlet of the inflow cavity (108) is controlled through the deformation of the diaphragm (200) between the power cavity (303) and the inflow cavity (108), so that the flow entering the plug (104) is adjusted.

3. The splicing pneumatic steady flow micro valve manufactured by 3D printing according to claim 2 is characterized in that the bottom surface of the inflow cavity (108) is concave arc-shaped and is communicated with the plug (104) through an outflow cavity (110), one side of the inflow cavity (108) is connected with the outflow cavity (110) through a step (109), an overflow flow channel for communicating the inflow cavity (108) with the outflow cavity (110) is formed between the step (109) and the diaphragm (200), and when the pressure of the power cavity (303) changes, the diaphragm (200) deforms to be close to or far away from the step (109) so as to enable the opening degree of the overflow flow channel to achieve the purpose of flow regulation.

4. The splicing pneumatic steady flow micro valve manufactured by 3D printing is characterized in that a first fluid connector (101) is integrally connected to the lower flow channel block (100), and fluid channels respectively communicating the first fluid connector (101) with the inflow cavity (106), the inflow cavity (106) with the inflow cavity (108), and the outflow cavity (110) with the plug (104) are arranged in the lower flow channel block (100).

5. The splicing pneumatic steady flow micro valve manufactured by 3D printing according to claim 2, wherein a power joint (310) and a second fluid joint (308) are integrally connected to the upper flow passage block (300), and fluid channels respectively communicating the small groove (307) with the feedback cavity (302), the feedback cavity (302) with the second fluid joint (308), and the power joint (310) with the power cavity (303) are arranged in the upper flow passage block (300).

6. The 3D printing manufactured splicing pneumatic steady flow micro valve is characterized in that a slot (306) matched with the plug (104) is formed in the bottom surface of the upper runner block (300), the small groove (307) is located on the slot bottom surface of the slot (306), and a slot sealing gasket (115) is installed between the slot (306) and the plug (104).

7. The splicing type pneumatic steady flow micro valve manufactured through 3D printing is characterized in that a steady flow chamber sealing groove (105) used for installing a sealing ring is formed in the outer ring of the inflow cavity (106), and a flow regulating chamber sealing groove (111) used for installing a sealing ring is formed in the outer ring of the inflow cavity (108).

8. The splicing type pneumatic steady flow micro valve manufactured through 3D printing is characterized in that a first positioning portion is arranged on the top surface of the lower flow passage block (100), a second positioning portion matched with the first positioning portion is arranged on the bottom surface of the upper flow passage block (300), a positioning hole (203) for the first positioning portion and the second positioning portion to penetrate through is formed in the diaphragm (200), and a plug hole (204) for the plug (104) to penetrate through is formed in the diaphragm.

9. The 3D printing manufactured splicing pneumatic steady flow micro valve is characterized in that the lower flow channel block (100), the diaphragm (200) and the upper flow channel block (300) are locked through bolts, the diaphragm (200) is made of PDMS, and the diaphragm (200) fills a gap between the two flow channel blocks; the lower runner block (100) or/and the upper runner block (300) is/are provided with a buckling part for connecting the micro valves.

Technical Field

The invention relates to the technical field of microfluidics, in particular to a splicing pneumatic steady-flow micro valve manufactured by 3D printing.

Background

The micro-fluidic chip (lab-on-a-chip) is an integrated chip which takes micro-fluid as an operation object and replaces a laboratory to complete the functions of introducing, transmitting, diluting, mixing, reacting, detecting and the like of a trace sample, and has great development potential in the fields of chemistry, biology, medicine and the like.

The micro valve is one of the most important modules on the microfluidic chip, is used for controlling the opening of a flow channel, changing the flow direction, adjusting the flow rate, the flow stability and the like, and the performance of the micro valve has a decisive influence on the function of the microfluidic chip. The micro-valve has various types, and can be divided into a piezoelectric ceramic micro-valve, a pneumatic micro-valve, an electromagnetic micro-valve, a shape memory alloy micro-valve, a phase change micro-valve and the like according to a driving form, but the traditional micro-valve only considers the flow control effect in design and does not consider the flow stability. The control object of the micro-valve is micro-flow, the precision of flow control is particularly emphasized when the micro-valve is applied, and when the inlet pressure fluctuates, if no measures are taken, the flow fluctuates to influence the test results of chemical examination or biological analysis and the like, so that the micro-valve which can regulate the flow and ensure the flow stability of the micro-flow channel is urgently needed.

Disclosure of Invention

The invention provides a splicing pneumatic flow stabilization micro valve manufactured by 3D printing, and a flow stabilization structure is designed to reduce pressure fluctuation of inflow fluid, so that the flow stability is ensured.

The technical scheme adopted by the invention is as follows:

a splicing pneumatic steady flow micro valve manufactured by 3D printing comprises a lower runner block, a diaphragm and an upper runner block, wherein the diaphragm is connected between the bottom surface of the lower runner block and the top surface of the upper runner block in a sealing manner; the top surface of the lower runner block is provided with a flow inlet cavity, a flow inlet cavity communicated with the flow inlet cavity and a plug communicated with the flow inlet cavity; the bottom surface of the upper runner block is provided with a small groove communicated with the plug and a feedback cavity communicated with the small groove and corresponding to the inflow cavity; the flow inlet cavity is communicated with an external fluid source, the feedback cavity is communicated with the outside through a flow channel, and when the pressure of fluid entering the flow inlet cavity or the feedback cavity fluctuates, the diaphragm between the flow inlet cavity and the feedback cavity deforms, so that the flow fluctuation is reduced.

The bottom surface of the upper runner block is also provided with a power cavity corresponding to the inflow cavity, the power cavity is communicated with an external fluid source, and the flow area of the outlet of the inflow cavity is controlled through the deformation of the diaphragm between the power cavity and the inflow cavity, so that the flow entering the plug is regulated.

The bottom surface of the inflow cavity is concave arc-shaped and is communicated with the plug through an outflow cavity, one side of the inflow cavity is connected with the outflow cavity through a step, an overflow channel for communicating the inflow cavity with the outflow cavity is formed between the step and the diaphragm, and when the pressure of the power cavity changes, the diaphragm deforms to be close to or far away from the step to enable the opening degree of the overflow channel to achieve the purpose of flow regulation.

The lower runner block is integrally connected with a first fluid connector, and fluid channels which respectively communicate the first fluid connector with the inflow cavity, the inflow cavity with the inflow cavity, and the outflow cavity with the plug are arranged in the lower runner block.

The upper runner block is integrally connected with a power joint and a second fluid joint, and fluid channels which respectively communicate the small groove with the feedback cavity, the feedback cavity with the second fluid joint and the power joint with the power cavity are arranged in the upper runner block.

The bottom surface of the upper runner block is provided with a slot matched with the plug, the small groove is positioned on the bottom surface of the slot, and a slot sealing gasket is arranged between the slot and the plug.

The outer ring of the inflow cavity is provided with a flow stabilizing chamber sealing groove for mounting a sealing ring, and the outer ring of the inflow cavity is provided with a flow regulating chamber sealing groove for mounting a sealing ring.

The top surface of the lower runner block is provided with a first positioning part, the bottom surface of the upper runner block is provided with a second positioning part matched with the first positioning part, and the diaphragm is provided with a positioning hole for the first positioning part and the second positioning part to pass through and an insertion hole for the plug to pass through.

The lower runner block, the diaphragm and the upper runner block are locked through bolts, the diaphragm is made of PDMS, and a gap between the two runner blocks is filled with the diaphragm; and the lower runner block or/and the upper runner block is/are provided with a buckling part for connecting the micro valves.

The invention has the following beneficial effects:

the invention designs a flow stabilizing structure, the fluid of the inlet cavity and the feedback cavity interacts with each other through the diaphragm to change the deflection of the diaphragm, so that the flow resistance is changed, the inlet pressure is increased, the flow resistance is also increased, the inlet pressure is changed, the lower flow resistance is reduced, the flow fluctuation caused by the inlet pressure change of the flow channel can be eliminated, the flow stability is ensured, and the flow stability control capability of the micro valve is improved.

The invention designs a flow regulating structure, wherein a power cavity is arranged in a feedback flow channel, and the area of a flow channel at the outlet of the flow cavity is controlled by the pressure of the power cavity, so that the control of flow and opening and closing is realized, and the flow regulating effect and the cut-off property are good; the bottom surface of the inflow cavity is provided with the concave cambered surface, so that the diaphragm is tightly attached to the bottom surface of the inflow cavity when deforming, and the flow cut-off and opening degree control performance of the micro valve is further improved.

The snap-in connection structure is arranged in the invention, so that the connection of a plurality of micro valves is convenient, or the micro valves are connected to other micro-fluidic modules.

The invention adopts air pressure or hydraulic control, has small volume, can be manufactured by a 3D printing method, has higher manufacturing speed and higher repeatability compared with the traditional micro-valve manufacturing method, and can be used for batch manufacturing.

Drawings

Fig. 1 is a perspective view of an assembly structure of a lower flow block, a diaphragm membrane and an upper flow block of the present invention.

Fig. 2 is a perspective view of a lower flow channel block of the present invention.

Fig. 3 is a schematic structural view of the separator of the present invention.

Fig. 4 is a perspective view of the upper flow block of the present invention.

Fig. 5 is a perspective view from above of the lower flow block, membrane and upper flow block assembly structure of the present invention.

Fig. 6 is a sectional view taken along a-a in fig. 5.

Fig. 7 is a sectional view taken along B-B in fig. 5.

Fig. 8 is an exploded view of the present invention.

Fig. 9 is an enlarged view of a portion a in fig. 8.

In the figure: 100. a lower runner block; 200. a diaphragm; 300. an upper runner block; 101. a first fluid connector; 102. an inflow channel; 103. positioning a frustum; 104. a plug; 105. the flow stabilizing chamber seals the groove; 106. a flow inlet cavity; 107. a front feedback flow channel; 108. an inflow chamber; 109. a step; 110. an outflow cavity; 111. the flow regulating chamber seals the groove; 112. an outflow channel; 113. a flow stabilization chamber seal ring; 114. a flow regulating chamber sealing ring; 115. a slot gasket; 201. a flow stabilizing film; 202. flow regulating film; 203. positioning holes; 204. a jack; 301. positioning the conical groove; 302. a feedback chamber; 303. a power cavity; 304. a power flow passage; 305. a post-feedback runner; 306. a slot; 307. a small groove; 308. a second fluid connection; 309. an outflow channel; 310. and a power joint.

Detailed Description

The following describes embodiments of the present invention with reference to the drawings.

As shown in fig. 1 and 8, the splicing pneumatic steady flow micro valve manufactured by 3D printing of the present embodiment includes a lower flow channel block 100, a diaphragm 200 and an upper flow channel block 300, wherein the diaphragm 200 is hermetically connected between a bottom surface of the lower flow channel block 100 and a top surface of the upper flow channel block 300;

as shown in fig. 2, the lower flow passage block 100 has a top surface provided with a flow inlet chamber 106, a flow inlet chamber 108 communicating with the flow inlet chamber 106, and a plug 104 communicating with the flow inlet chamber 108;

as shown in fig. 4-7, the bottom surface of the upper flow passage block 300 is provided with a small groove 307 communicated with the plug 104, and a feedback cavity 302 communicated with the small groove 307 and corresponding to the inflow cavity 106; the inlet chamber 106 is in communication with an external fluid source and the feedback chamber 302 is in communication with the outside through a flow passage, and when the fluid pressure entering the inlet chamber 106 or the feedback chamber 302 fluctuates, the diaphragm 200 between the inlet chamber 106 and the feedback chamber 302 deforms, thereby reducing the flow fluctuation.

The bottom surface of the upper runner block 300 is also provided with a power cavity 303 corresponding to the inflow cavity 108, and the power cavity 303 is communicated with an external fluid source;

the diaphragm 200 between the power chamber 303 and the inlet chamber 108 is deformed by externally adjusting the pressure in the power chamber 303, thereby adjusting the flow into the plug 104 by adjusting the flow area at the outlet of the inlet chamber 108.

As shown in fig. 8 and 9, as an embodiment, the bottom surface of the inflow chamber 108 is a concave arc surface, and is communicated with the plug 104 through an outflow chamber 110, one side of the inflow chamber 108 is connected with the outflow chamber 110 through a step 109, an overflow channel connecting the inflow chamber 108 and the outflow chamber 110 is formed between the step 109 and the diaphragm 200, when the pressure of the power chamber 303 changes, the diaphragm 200 is pressed or loosened, so that the overflow channel is close to or far from the step 109 to change the opening of the overflow channel, and the purpose of adjusting the flow rate is achieved.

Specifically, the overflowing flow channel can be closed by the diaphragm 200 to perform a cutoff function according to actual needs.

As shown in fig. 2, the lower flow path block 100 is integrally connected with a first fluid connector 101, and fluid paths for respectively communicating the first fluid connector 101 with the inlet chamber 106, the inlet chamber 106 with the inlet chamber 108, and the outlet chamber 110 with the plug 104 are provided in the lower flow path block 100.

As shown in fig. 4, the upper runner block 300 is integrally connected with a power joint 310 and a second fluid joint 308, and fluid passages respectively communicating the small groove 307 with the feedback cavity 302, the feedback cavity 302 with the second fluid joint 308, and the power joint 310 with the power cavity 303 are arranged in the upper runner block 300.

In one embodiment, the bottom surface of the upper flow path block 300 is provided with a slot 306 for matching with the plug 104, a small groove 307 is positioned on the bottom surface of the slot 306, and a slot gasket 115 is installed between the slot 306 and the plug 104.

In one embodiment, the top surface of the lower flow path block 100 is provided with a first positioning portion, and the bottom surface of the upper flow path block 300 is provided with a second positioning portion engaged with the first positioning portion.

Specifically, as shown in fig. 2 and 4, the first positioning portion employs a positioning frustum 103, and the second positioning portion employs a positioning tapered groove 301 that engages with the positioning frustum 103.

As shown in fig. 3, the diaphragm 200 is provided with a positioning hole 203 through which the first positioning portion and the second positioning portion pass, and an insertion hole 204 through which the plug 104 passes.

In one embodiment, an inflow channel 102, a front feedback channel 107 and a middle feedback channel 112 are arranged in the lower flow channel block 100, one end of the inflow channel 102 is located at the central inlet of the first fluid connector 101, and the other end is located at the bottom of the inflow cavity 106; one end of the front feedback channel 107 is located at the bottom surface of the inflow cavity 106, the other end is located at the bottom surface of the inflow cavity 108, one end of the middle feedback channel 112 is located at the bottom surface of the outflow cavity 110, and the other end is located at the central entrance of the top surface of the plug 104;

in one embodiment, a rear feedback flow channel 305 and an outflow flow channel 309 are arranged in the upper flow channel block 300, one end of the rear feedback flow channel 305 is located at the bottom surface of the small groove 307, the other end of the rear feedback flow channel is located at the bottom surface of the feedback cavity 302, one end of the outflow flow channel 309 is located at the bottom surface of the feedback cavity 302, and the other end of the outflow flow channel 309 is located at the central inlet (outlet) of the second fluid connector 308; a power flow passage 304 in the central inlet of power fitting 310 communicates to the bottom surface of power cavity 303.

As shown in fig. 5-7, each chamber is an independent sealed chamber formed by an open slot and a diaphragm 200 arranged on the bottom surface of the upper runner block 300 or the top surface of the lower runner block 100, and the plug 104 protrudes from the top surface of the lower runner block 100, is fittingly inserted into the slot gasket 115 installed in the slot 306, and is butted with the small groove 307 at the bottom of the slot 306, and meanwhile, the sealing performance is ensured.

In one embodiment, the outer ring of the inlet chamber 106 is provided with a flow stabilizing chamber sealing groove 105 for mounting a sealing ring, the outer ring of the inlet chamber 108 is provided with a flow regulating chamber sealing groove 111 for mounting a sealing ring, and as shown in fig. 8, the flow stabilizing chamber sealing groove 105 and the flow regulating chamber sealing groove 111 are respectively provided with a flow stabilizing chamber sealing ring 113 and a flow regulating chamber sealing ring 114, so that the sealing performance between the diaphragm 200 and the inlet chamber 106 and the feedback chamber 302, and between the diaphragm 200 and the inlet chamber 108 and the power chamber 303 is ensured.

As an embodiment, the lower flow path block 100, the diaphragm 200, and the upper flow path block 300 are locked by bolts;

the diaphragm 200 is made of PDMS or other materials with large deformation and good toughness, and the diaphragm 200 fills the gap between the two flow channel blocks.

As shown in FIG. 3, for ease of description and clarity of visual presentation, the corresponding portion of the diaphragm 200 between the inlet chamber 106 and the feedback chamber 302 is designated as a flow stabilizing membrane 201, and the corresponding portion of the diaphragm 200 between the power chamber 303 and the inlet chamber 108 is designated as a flow regulating membrane 202.

In one embodiment, the lower flow path block 100 and/or the upper flow path block 300 is provided with a locking portion for connecting the plurality of micro valves.

The pneumatic stationary flow micro valve that can splice of 3D printing preparation of this embodiment, concrete working method and principle:

through setting up the steady flow chamber structure, steady flow is undulant, improves the flow stability control ability of microvalve.

Through setting up the flow chamber structure of transferring, adjust the flow size, improve the control performance of the flow size of microvalve.

As shown in fig. 6, the flow stabilization chamber structure is composed of an inflow cavity 106, a feedback cavity 302 and a flow stabilization film 201 therebetween,

as shown in FIG. 7, the flow regulating chamber structure is composed of an inflow cavity 108-a step 109-an outflow cavity 110, a power cavity 303 and a flow regulating film 202 between the two.

The micro valve is provided with a first male connector 101 and a second male connector 308 which can be directly connected with other micro-fluidic modules provided with female connectors or connected through silicone tubes. Fluid may flow into the first fluid connection 101, out of the second fluid connection 308, or vice versa.

Specifically, as shown in fig. 2, fluid flows from the inlet flow channel 102 of the lower flow channel block 100 into the inlet chamber 106, through the front feedback flow channel 107 to the inlet chamber 108, then from the outlet chamber 110 into the intermediate feedback flow channel 112, and into the plug 104; as shown in fig. 4 and 5, the fluid flows from the plug 104 into the small groove 307, passes through the rear feedback channel 305 to the feedback chamber 302, and flows out from the outflow channel 309 through the second fluid connector 308.

As shown in fig. 6 and 7, the inflow cavity 106 and the feedback cavity 302 are correspondingly arranged and separated by the flow stabilizing film 201, and meanwhile, the inflow cavity 106 and the feedback cavity 302 are respectively connected with the front feedback flow channel 107 and the rear feedback flow channel 305, and pressure loss exists when fluid flows through the feedback flow channel, so that the fluid pressure of the inflow cavity 106 is greater than the fluid pressure of the feedback cavity 302, the flow stabilizing film 201 bends towards the feedback cavity 302, the flow stabilizing film 201 deflects more when the inlet pressure is higher, so that the flow resistance of the flow channel is increased, thereby reducing the flow, otherwise, the flow stabilizing film 201 deflects less when the inlet pressure is reduced, so that the flow resistance of the flow channel is reduced, thereby increasing the flow and achieving the. A step 109 is arranged between the inflow cavity 108 and the outflow cavity 110, the inflow cavity 108, the outflow cavity 110 and the power cavity 303 are isolated by the flow regulating film 202, and the pressure change of the power cavity 303 can change the flexibility of the flow regulating film 202 so as to change the opening degree of an overflowing flow channel formed between the bottom surface of the step 109 and the flow regulating film 202, thereby playing the roles of opening and closing the flow channel and regulating the flow.

Specifically, the bottom surface of the inflow chamber 108 is a curved surface structure, the diaphragm 200 (flow regulating film 202) can be tightly attached to the bottom surface of the inflow chamber 108 through bending deformation, the flow control effect is more accurate, and the leakage amount of the flow channel is lower when the flow channel is closed.

Specifically, the power cavity 303 may be filled with gas or liquid, and the power cavity 303 is connected to a pressure control device such as an external precision pressure regulating valve or a pressure pump through a power flow passage 304 to regulate the pressure of the power cavity 303, and thus the flow rate.

Specifically, the first fluid connector 101 and the second fluid connector 308 can be made as standard male connectors.

The micro valve of the embodiment can be manufactured by a 3D printing method, is quick to manufacture, high in repeatability and capable of being manufactured in batches, meanwhile, the universal connecting joint is arranged, the micro valve can be directly connected with other micro-fluidic modules through the matching of a male joint and a female joint, and can also be connected with other micro-fluidic modules through a silicone tube, so that the micro valve is convenient for personnel to operate.