Fluid delivery device

Abstract

The invention relates to the technical field of piezoelectric current pumps, and discloses a fluid conveying device which comprises a valve seat, a valve cover, a piezoelectric assembly and a valve diaphragm. The valve seat is provided with a flow inlet, a flow outlet, a flow inlet pipeline and a flow outlet pipeline; the valve cover is arranged on the valve seat and connected with the valve seat, a flow inlet channel and a flow outlet channel are formed in the valve cover, the flow inlet channel is communicated with the flow inlet, and the flow outlet channel is communicated with the flow outlet; a pump cavity is defined by the piezoelectric assembly and the valve deck and communicates with the inflow channel and the outflow channel. The valve diaphragm is clamped between the valve cover and the valve seat, the valve diaphragm comprises a first valve plate and a second valve plate, the first valve plate can be switched from the position covering the flow inlet to the position of one-way opening towards the flow inlet channel, and the second valve plate can be switched from the position covering the flow outlet channel to the position of one-way opening towards the flow outlet pipeline. The structural design of the reverse flow valve diaphragm is optimized, the reverse flow prevention effect of the reverse flow valve diaphragm is improved, and the performance and reliability of a fluid conveying device are remarkably improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of piezoelectric flow pumps, in particular to a fluid delivery device. BACKGROUND

[0002] At present, piezoelectric micro fluid delivery devices have been widely used in industrial spraying, agricultural irrigation, printer inkjet and liquid medicine transportation in medical and biotechnology fields due to their precise control ability and small size. These devices usually use the piezoelectric effect of piezoelectric components to drive fluid delivery by changing their shape.

[0003] However, there are still some technical defects in the piezoelectric micro fluid delivery devices on the market that need to be solved, such as the anti-backflow effect of the valve membrane of the existing device is not ideal, which may cause backflow of the fluid during the delivery process. This not only affects the delivery efficiency and accuracy of the fluid, but also may cause damage to the equipment.

[0004] Therefore, it is urgent to develop a fluid delivery device with innovative structure, which can realize ultra-thin structure while ensuring high-precision fluid control and stable output performance. SUMMARY

[0005] The purpose of the present application is to design a safe and reliable fluid delivery device that can stably output.

[0006] In order to achieve the above purpose, the present application provides a fluid delivery device, comprising:

[0007] a valve seat, which is provided with an inlet and an outlet arranged at intervals, and is further provided with an inlet pipeline in communication with the inlet and an outlet pipeline in communication with the outlet;

[0008] a valve cover, which is arranged on the valve seat and connected with the valve seat, and is provided with an inlet channel and an outlet channel arranged at intervals, the inlet channel being in communication with the inlet, and the outlet channel being in communication with the outlet;

[0009] a piezoelectric component, which is arranged on the side of the valve cover away from the valve seat and forms a pump cavity together with the valve cover, the pump cavity being in communication with the inlet channel and the outlet channel respectively;

[0010] a valve membrane, which is clamped between the valve cover and the valve seat, the valve membrane comprising a first valve piece arranged at the inlet and a second valve piece arranged at the outlet, the first valve piece being capable of switching from a position covering the inlet to block it to a position opening the inlet to the inlet channel in one direction, and the second valve piece being capable of switching from a position covering the outlet to block it to a position opening the outlet to the outlet pipeline in one direction.

[0011] Further, the first valve sheet is provided with a first boss protruding towards the inflow pipe, when the first valve sheet is covered on the inflow port, the outer wall of the first boss is in close connection with the inner circumferential wall of the inflow pipe, and / or

[0012] The second valve sheet is provided with a second boss protruding towards the outflow channel, when the second valve sheet is covered on the outflow channel, the outer wall of the second boss is in close connection with the inner circumferential wall of the outflow channel.

[0013] Further, the valve diaphragm further comprises a diaphragm body, a first support and a second support, the first support connects the diaphragm body and the first valve sheet, the second support connects the diaphragm body and the second valve sheet; when the first valve sheet is covered on the inflow port, the first valve sheet and the valve seat are arranged in close contact with the outer surface of the valve diaphragm to block the inflow port; when the second valve sheet is covered on the outflow channel, the second valve sheet and the valve cover are arranged in close contact with the outer surface of the valve diaphragm to block the outflow channel.

[0014] Further, the outer wall of the first boss comprises a first circumferential wall surface, a first top surface and a first fillet surface, the first circumferential wall surface is connected with the first valve sheet, the first fillet surface is annularly arranged on the first top surface and connects the first top surface and the first circumferential wall surface, an included angle is formed between the first fillet surface and the first circumferential wall surface, when the first valve sheet is covered on the inflow port, the first fillet surface abuts against the inner circumferential wall of the inflow pipe to make the first boss in close connection with the inflow pipe;

[0015] The outer wall of the second boss comprises a second circumferential wall surface, a second top surface and a second fillet surface, the second circumferential wall surface is connected with the second valve sheet, the second fillet surface is annularly arranged on the second top surface and connects the second top surface and the second circumferential wall surface, an included angle is formed between the second fillet surface and the second circumferential wall surface, when the second valve sheet is covered on the outflow channel, the second fillet surface abuts against the inner circumferential wall of the outflow channel to make the second boss in close connection with the outflow channel.

[0016] Further, the valve seat is provided with a positioning member protruding towards the valve cover, the valve cover is provided with a positioning hole towards the valve cover, and the positioning member is arranged in the positioning hole.

[0017] Further, the piezoelectric assembly comprises a diaphragm and a piezoelectric element, the valve cover has oppositely arranged first and second surfaces, the inlet flow channel and the outlet flow channel both penetrate the first and second surfaces, a recess is formed in the center of the first surface, and a connecting portion is further arranged on the first surface and surrounds the recess, the connecting portion is arranged in close contact with the diaphragm so that the recess defines the pump cavity, and the piezoelectric element is arranged on the side of the diaphragm away from the first surface.

[0018] Further, a glue overflow ring groove is further formed in the first surface and surrounds the recess, and the connecting portion surrounds the outer periphery of the glue overflow ring groove.

[0019] Further, a first sealing groove surrounding the inlet of the inlet flow channel and a second sealing groove surrounding the outlet of the outlet flow channel are formed in the second surface of the valve cover, and a sealing ring is arranged in each of the first and second sealing grooves.

[0020] Further, the inlet flow conduit comprises an inlet inner tube and an inlet outer tube, one end of the inlet inner tube is in communication with the inlet port, the other end is in communication with the inlet outer tube, the inner diameter of the inlet outer tube gradually decreases towards the inlet inner tube, and / or

[0021] the outlet flow conduit comprises an outlet inner tube and an outlet outer tube, one end of the outlet inner tube is in communication with the outlet port, the other end is in communication with the outlet outer tube, and the inner diameter of the outlet outer tube gradually decreases towards the outlet inner tube.

[0022] Further, the inner diameter of the inlet flow channel gradually increases towards the inlet port, and / or

[0023] the inner diameter of the outlet flow conduit gradually increases towards the outlet port.

[0024] Compared with the prior art, the fluid conveying device of the embodiment of the present application has the following beneficial effects:

[0025] The fluid conveying device of the embodiment of the present application is thin and can be easily integrated in a space-limited application scenario. The structure design of the first valve plate and the second valve plate in the valve diaphragm realizes one-way sealing of the inlet port and the outlet port, effectively prevents backflow of the liquid during conveying, and ensures the accuracy and stability of liquid conveying. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is an explosion of the fluid conveying device of the embodiment of the present application Figure 1 ;

[0027] Figure 2is the explosion of the fluid delivery device of the embodiment of the present application Figure 2 ;

[0028] Figure 3 is the structural diagram of the valve seat in the fluid delivery device of the embodiment of the present application

[0029] Figure 4 is the structural diagram of the valve cover in the fluid delivery device of the embodiment of the present application Figure 1 ;

[0030] Figure 5 is the structural diagram of the valve cover in the fluid delivery device of the embodiment of the present application Figure 2 ;

[0031] Figure 6 is the structural diagram of the valve diaphragm in the fluid delivery device of the embodiment of the present application

[0032] Figure 7 is the enlarged diagram of A in Figure 6 ;

[0033] Figure 8 is the enlarged diagram of B in Figure 6 ;

[0034] Figure 9 is the sectional view of the fluid delivery device of the embodiment of the present application

[0035] Figure 10 is the enlarged diagram of C in Figure 9 ;

[0036] Figure 11 is the enlarged diagram of D in Figure 9 .

[0037] In the figure, 1, valve seat; 11, inlet port; 12, outlet port; 13, inlet pipeline; 131, inlet inner tube; 132, inlet outer tube; 14, outlet pipeline; 141, outlet inner tube; 142, outlet outer tube; 15, positioning member;

[0038] 2, valve cover; 21, inlet passage; 22, outlet passage; 23, positioning hole; 24, first surface; 241, recess; 242, connecting part; 243, overflow ring groove; 25, second surface; 251, first sealing groove; 252, second sealing groove;

[0039] 3, piezoelectric component; 31, diaphragm; 32, piezoelectric element;

[0040] 4, valve diaphragm; 41, first valve plate; 411, first boss; 4111, first peripheral wall surface; 4112, first top surface; 4113, first fillet surface; 42, second valve plate; 421, second boss; 4211, second peripheral wall surface; 4212, second top surface; 4213, second fillet surface; 43, diaphragm body; 44, first support; 45, second support;

[0041] 5, pump cavity;

[0042] 6, sealing ring. DETAILED DESCRIPTION

[0043] The specific embodiments of the present application will be further described in conjunction with the drawings and examples. The following examples are used to illustrate the present application, but are not used to limit the scope of the present application.

[0044] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like in the present application are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0045] In the description of the present application, it should be understood that the terms "connected", "connected", "fixed" and the like in the present application should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be weldedly connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0046] The terms "first", "second" and the like are used to describe various information in the present application, but these information should not be limited to these terms, and these terms are only used to distinguish the same type of information from each other. For example, the "first" information can also be referred to as "second" information without departing from the scope of the present application, and similarly, the "second" information can also be referred to as "first" information.

[0047] Reference Figure 1 , Figure 2 and Figure 3The fluid delivery device of the embodiment of the present application comprises a valve seat 1, a valve cover 2, a piezoelectric assembly 3 and a valve diaphragm 4. The valve seat 1 is provided with an inlet port 11 and an outlet port 12 arranged at intervals, and is further provided with an inlet pipeline 13 communicating with the inlet port 11 and an outlet pipeline 14 communicating with the outlet port 12. The valve cover 2 is arranged on the valve seat 1 and is connected with the valve seat 1. The valve cover 2 is provided with an inlet passage 21 and an outlet passage 22 arranged at intervals. The inlet passage 21 communicates with the inlet port 11, and the outlet passage 22 communicates with the outlet port 12. The piezoelectric assembly 3 is arranged on the side of the valve cover 2 away from the valve seat 1, and forms a pump cavity 5 together with the valve cover 2. The pump cavity 5 communicates with the inlet passage 21 and the outlet passage 22 respectively. The valve diaphragm 4 is arranged between the valve cover 2 and the valve seat 1. The valve diaphragm 4 comprises a first valve plate 41 arranged at the inlet port 11 and a second valve plate 42 arranged at the outlet port 12. The first valve plate 41 can be switched from a position covering the inlet port 11 to a position unidirectionally opening towards the inlet passage 21. The second valve plate 42 can be switched from a position covering the outlet passage 22 to a position unidirectionally opening towards the outlet pipeline 14.

[0048] Specifically, the inlet passage 21 is provided with a first cavity at one end thereof towards the first valve plate 41. The first cavity can accommodate the first valve plate 41 and allow the first valve plate 41 to unidirectionally open. When liquid flows from the inlet pipeline 13 to the pump cavity 5 through the inlet passage 21 from the inlet port 11, the first valve plate 41 is pushed by the liquid pressure into the first cavity and unidirectionally opens towards the inlet passage 21. When liquid flows from the inlet passage 21 to the inlet pipeline 13 through the inlet port 11, the first valve plate 41 covers the inlet port 11 and abuts against the valve seat 1 to block the inlet port 11. Similarly, the outlet pipeline 14 is also provided with a second cavity at one end thereof towards the second valve plate 42. The second cavity can accommodate the second valve plate 42 and allow the second valve plate 42 to unidirectionally open. When liquid flows from the pump cavity 5 to the outlet pipeline 14 through the outlet passage 22 from the outlet port 12, the second valve plate 42 is pushed by the liquid pressure into the second cavity and unidirectionally opens towards the outlet pipeline 14. When liquid flows from the outlet pipeline 14 to the outlet passage 22 through the outlet port 12, the second valve plate 42 covers the outlet passage 22 and abuts against the valve cover 2 to block the outlet passage 22.

[0049] When the piezoelectric component 3 is deformed by the excitation signal, the volume of the pump cavity 5 will change. When the volume of the pump cavity 5 increases, the first valve plate 41 opens the inflow port 11, and the liquid is sucked into the pump cavity 5; when the volume of the pump cavity 5 decreases, the second valve plate 42 opens the outflow channel 22, and the liquid is discharged to the outflow pipe 14, while the first valve plate 41 is pressed to prevent backflow of the liquid. Through the periodic driving of the piezoelectric component 3, the continuous and directional delivery of the liquid is realized. The application effectively prevents backflow of the liquid during the non-working period through the design of the valve diaphragm 4, and ensures the accuracy and reliability of the liquid delivery.

[0050] Reference Figure 6 In some improved schemes of the application, the first valve plate 41 is provided with a first boss 411 protruding towards the inflow pipe 13, and when the first valve plate 41 is arranged on the inflow port 11, the outer wall of the first boss 411 is in close connection with the inner circumferential wall of the inflow pipe 13. When the piezoelectric component 3 drives the pump cavity 5 to decrease in volume, the first valve plate 41 will be pushed towards the inflow port 11, and at this time the first boss 411 is tightly pressed against the inner circumferential wall of the inflow pipe 13 under the action of the liquid pressure, forming a sealed barrier.

[0051] Similarly, in some improved schemes of the application, the second valve plate 42 is provided with a second boss 421 protruding towards the outflow channel 22, and when the second valve plate 42 is arranged on the outflow channel 22, the outer wall of the second boss 421 is in close connection with the inner circumferential wall of the outflow channel 22. When the piezoelectric component 3 drives the pump cavity 5 to increase in volume, the liquid is sucked into the pump cavity 5, and at this time the second valve plate 42 is pushed towards the outflow channel 22, and the second boss 421 is in close contact with the inner wall of the outflow channel 22, preventing backflow of the liquid from the outflow channel 22.

[0052] The design of the first boss 411 and the second boss 421 can make the valve plate form a more reliable seal when it is in the blocking position, effectively eliminating the risk of potential leakage, improving the sealing performance of the valve diaphragm 4 in the blocking state, and further enhancing the unidirectionality and anti-backflow capability of the liquid delivery.

[0053] In some improved schemes of the application, the valve diaphragm 4 further comprises a diaphragm body 43, a first support 44 and a second support 45, the first support 44 connects the diaphragm body 43 and the first valve plate 41, and the second support 45 connects the diaphragm body 43 and the second valve plate 42; when the first valve plate 41 is arranged on the inflow port 11, the first valve plate 41 and the valve seat 1 are arranged in close contact with the outer surface of the valve diaphragm 4 to block the inflow port 11; when the second valve plate 42 is arranged on the outflow channel 22, the second valve plate 42 and the valve cover 2 are arranged in close contact with the outer surface of the valve diaphragm 4 to block the outflow channel 22.

[0054] The diaphragm body 43 is a flexible substrate, on which the functional areas of the first valve plate 41 and the second valve plate 42 are integrated: the first support 44 connects the first valve plate 41 and the diaphragm body 43, so that the first valve plate 41 can be switched between the blocking position and the one-way opening position; when the first valve plate 41 is in the blocking position, the first boss 411 and the part of the first valve plate 41 surrounding the first boss 411 jointly form two sealing structures: the first sealing structure between the first boss 411 and the inner circumferential wall of the inlet pipe 13, and the second sealing structure between the first valve plate 41 and the outer surface of the valve seat 1. Similarly, the second support 45 connects the second valve plate 42 and the diaphragm body 43, so that the second valve plate 42 can be switched between the blocking position and the one-way opening position; when the second valve plate 42 is in the blocking position, the second boss 421 and the part of the second valve plate 42 surrounding the second boss 421 jointly form two sealing structures: the first sealing structure between the second valve plate 42 and the valve seat 1, and the second sealing structure between the second boss 421 and the outlet pipe 14.

[0055] The first boss 411 and the second boss 421 can also respectively weaken the vibration amplitude of the first valve plate 41 and the second valve plate 42, while increasing the damping thereof, further suppressing high-frequency vibration, reducing the situation that the device cannot be reset due to excessive deformation caused by excessive vibration amplitude, further reducing the possibility of fatigue failure, and improving the reliability and service life of the device. In other improved schemes of the present application, the side of the first valve plate 41 away from the first boss 411 is provided with a third boss, and the third boss is symmetrically arranged with the first boss 411 relative to the first valve plate 41; the side of the second valve plate 42 away from the second boss 421 is provided with a fourth boss, and the fourth boss is symmetrically arranged with the second boss 421 relative to the second valve plate 42.

[0056] Reference Figure 7 and Figure 8In some improved schemes of the present application, the outer wall of the first boss 411 comprises a first peripheral wall surface 4111, a first top surface 4112, and a first fillet surface 4113. The first peripheral wall surface 4111 is connected with the first valve plate 41. The first fillet surface 4113 is annularly arranged on the first top surface 4112 and connects the first top surface 4112 and the first peripheral wall surface 4111. An included angle is formed between the first fillet surface 4113 and the first peripheral wall surface 4111. When the first valve plate 41 is arranged on the inflow port 11, the first fillet surface 4113 abuts against the inner peripheral wall of the inflow pipe 13 to enable the first boss 411 to be in sealed connection with the inflow pipe 13. The outer wall of the second boss 421 comprises a second peripheral wall surface 4211, a second top surface 4212, and a second fillet surface 4213. The second peripheral wall surface 4211 is connected with the second valve plate 42. The second fillet surface 4213 is annularly arranged on the second top surface 4212 and connects the second top surface 4212 and the second peripheral wall surface 4211. An included angle is formed between the second fillet surface 4213 and the second peripheral wall surface 4211. When the second valve plate 42 is arranged on the outflow passage 22, the second fillet surface 4213 abuts against the inner peripheral wall of the outflow passage 22 to enable the second boss 421 to be in sealed connection with the outflow passage 22.

[0057] The linear contact abutment of the first fillet surface 4113 and the inner peripheral wall of the inflow pipe 13 enables the first boss 411 and the inflow pipe 13 to be in sealed connection, and the linear contact abutment of the second fillet surface 4213 and the inner peripheral wall of the outflow passage 22 enables the second boss 421 and the outflow passage 22 to be in sealed connection. The linear contact abutment can withstand a certain amount of displacement and deformation, which helps to maintain the integrity of the seal. In addition, the fillet surface can guide the alignment and abutment of the boss and the inner wall of the pipe (or passage), making the assembly smoother. Specifically, the fillet surface is the chamfer surface between the top surface and the peripheral wall surface.

[0058] In specific embodiments of the present application, the height of the boss is in the range of 0.01mm-5mm. After assembly, the top fillet of the boss is tangent to the fillet at the inflow port 11 and the outflow passage 22 to form a linear contact seal. At the same time, the valve plate and the valve seat 1 and the valve cover 2 form a surface contact seal, providing two sealing states and greatly improving the anti-backflow effect. At the same time, the boss can limit the movement of the valve plate, reduce the excessive deformation caused by excessive amplitude, and avoid the situation that the valve plate cannot reset and the anti-backflow effect is lost.

[0059] In some improved schemes of the present application, the valve seat 1 is provided with a positioning member 15 protruding towards the valve cover 2, the valve cover 2 is provided with a positioning hole 23 facing the valve cover 2, and the positioning member 15 is arranged in the positioning hole 23. Through the cooperation of the positioning member 15 and the positioning hole 23, the relative position of the valve seat 1 and the valve cover 2 during assembly can be ensured. In some embodiments of the present application, a plurality of positioning members 15 and a plurality of corresponding positioning holes 23 can be provided to improve the assembly accuracy of the valve seat 1 and the valve cover 2; in other embodiments, the positioning hole 23 can be designed as a special-shaped hole, and a positioning member 15 matching the shape of the hole can be arranged to facilitate installation, thereby reducing the assembly difficulty of the valve seat 1 and the valve cover 2.

[0060] In some improved schemes of the present application, the piezoelectric assembly 3 includes a diaphragm 31 and a piezoelectric element 32, the valve cover 2 has a first surface 24 and a second surface 25 arranged oppositely, the inlet flow channel 21 and the outlet flow channel 22 both penetrate the first surface 24 and the second surface 25, the center of the first surface 24 is provided with a groove 241, and the first surface 24 is further provided with a connecting portion 242 arranged around the groove 241, the connecting portion 242 is arranged in close contact with the diaphragm 31 to define the pump cavity 5 by the groove 241, and the piezoelectric element 32 is arranged on the side of the diaphragm 31 away from the first surface 24. By arranging the groove 241 in the center of the first surface 24 of the valve cover 2, the shape and size of the pump cavity 5 can be accurately defined and formed, which is helpful to simplify the overall structure of the fluid delivery device and improve the sealing performance and reliability.

[0061] During the assembly and bonding of the diaphragm 31 and the valve cover 2, glue overflow often occurs. The glue overflow not only occupies the effective space of the pump cavity 5, reduces the flow rate of the liquid output device, but also may cause the piezoelectric assembly 3 to be in direct contact with the glue overflow, thereby damaging the fluid delivery device and affecting its normal operation.

[0062] Therefore, with reference to Figure 4 In some improved schemes of the present application, the first surface 24 is further provided with a glue overflow ring groove 243 surrounding the groove 241, and the connecting portion 242 surrounds the outer periphery of the glue overflow ring groove 243. The valve cover 2 is bonded with the diaphragm 31 through the connecting portion 242. When glue overflow occurs during assembly, the overflowed glue can be captured by the glue overflow ring groove 243 and limited in the glue overflow ring groove 243, so as not to spread to the pump cavity 5 or other critical areas, which is helpful to keep the pump cavity 5 clean and improve the reliability of the fluid delivery device.

[0063] In the specific embodiments of the present application, the inner and outer diameters of the overflow ring groove differ by 0.01mm-10mm, and the groove depth is 0.005mm-3mm, which is conducive to the overflow glue situation that occurs when the valve cover 2 and the piezoelectric assembly 3 are bonded, and avoids the situation that the volume of the pump cavity 5 is reduced due to overflow glue, so that the output flow is reduced.

[0064] Reference Figure 5 In some improved schemes of the present application, a first sealing groove 251 surrounding the inlet of the inflow channel 21 and a second sealing groove 252 surrounding the outlet of the outflow channel 22 are formed on the second surface 25 of the valve cover 2, and a sealing ring 6 is arranged in each of the first sealing groove 251 and the second sealing groove 252, so that the valve cover 2 is sealingly connected with the valve diaphragm 4 through the sealing ring 6. In specific embodiments, a third sealing groove surrounding the inflow port 11 and a fourth sealing groove surrounding the outflow port 12 are also formed on the surface of the valve seat 1 facing the valve diaphragm 4, and a sealing ring 6 is also arranged in each of the third sealing groove and the fourth sealing groove, so that the valve seat 1 is sealingly connected with the valve diaphragm 4 through the sealing ring 6.

[0065] In some improved schemes of the present application, the inflow pipe 13 includes an inflow inner pipe 131 and an inflow outer pipe 132, one end of the inflow inner pipe 131 is in communication with the inflow port 11, and the other end is in communication with the inflow outer pipe 132, and the inner diameter of the inflow outer pipe 132 gradually decreases towards the inflow inner pipe 131. The outflow pipe 14 includes an outflow inner pipe 141 and an outflow outer pipe 142, one end of the outflow inner pipe 141 is in communication with the outflow port 12, and the other end is in communication with the outflow outer pipe 142, and the inner diameter of the outflow outer pipe 142 gradually decreases towards the outflow inner pipe 141. When the liquid enters the inflow port 11 from the inflow pipe 13, the gradually tapered channel of the inflow outer pipe 132 accelerates the liquid and helps to more effectively converge the liquid dispersed inside the inflow outer pipe 132 to the inflow inner pipe 131, thereby improving the efficiency of the liquid being sucked into the pump cavity 5. Similarly, the tapered design of the outflow outer pipe 142 also accelerates the speed of the liquid leaving the pump cavity 5, thereby improving the discharge efficiency of the liquid. This design helps the fluid delivery device to achieve a smaller or thinner design while maintaining efficient liquid control, increasing the amount of liquid transported at one time, and ensuring its application in the fields of medicine, computer technology, and printing, which have high requirements for liquid delivery amount.

[0066] In some improved schemes of the present application, the inner flow pipe 131 and the outer flow pipe 132 form an included angle, and the inner flow pipe 131 and the outer flow pipe 132 are smoothly transitioned; the inner flow pipe 141 and the outer flow pipe 142 form an included angle, and the inner flow pipe 141 and the outer flow pipe 142 are smoothly transitioned. Compared with the right-angle transition, the introduction of the included angle and the smooth transition surface can change the flow direction and speed of the liquid more gently, minimize the vortex and energy loss of the liquid at the pipe connection, further reduce the overall flow resistance, and improve the delivery flow of the liquid.

[0067] In some improved schemes of the present application, the inner diameter of the inflow channel 21 gradually increases in the direction of the inflow port 11. Specifically, the inner diameter of the inflow channel 21 near the end of the inflow port 11 is greater than the inner diameter of the inflow port 11, so that the first valve plate 41 can be unidirectionally opened towards the inflow channel 21; the inner diameter of the inflow channel 21 gradually increases in the direction of the inflow port 11, that is, the flow path of the fluid from the inflow port 11 to the pump cavity 5 gradually narrows, which helps to converge the fluid, reduces its diffusion before entering the pump cavity 5, and improves the fluid suction efficiency.

[0068] In some improved schemes of the present application, the inner diameter of the outflow pipe 13 gradually increases in the direction of the outflow port 12. Specifically, the inner diameter of the outflow pipe 13 near the end of the outflow port 12 is greater than the inner diameter of the outflow port 12, so that the second valve plate 42 can be unidirectionally opened towards the outflow pipe 13; the inner diameter of the outflow pipe 13 gradually increases in the direction of the outflow port 12, that is, the flow path of the fluid after being discharged from the outflow port 12 gradually increases, so as to reduce the turbulence that may be generated during the discharge of the fluid, reduce the impact and resistance of the fluid discharge, and improve the discharge efficiency.

[0069] The application can be used for liquid delivery in various industries. In the specific embodiments of the application, the valve seat 1 and the valve cover 2 can be made of high polymer materials such as ABS material; the valve diaphragm 4 can be made of high polymer materials such as PI, PE and the like. The vibrating diaphragm 31 can be made of metal materials as metal substrates such as steel, copper alloy and the like. When the piezoelectric element 32 receives a driving signal, a deformation is generated due to the piezoelectric effect, which drives the vibrating diaphragm 31 to move away from the valve cover 2, increases the volume of the pump cavity 5, and thus drives the first valve plate 41 and the first boss 411 thereon to move towards the inflow passage 21, opens the inflow port 11, so that the liquid flows into the inflow port 11 from the inflow pipe 13, enters the pump cavity 5 through the gap between the first boss 411 and the inflow passage 21, and completes the action of sucking the liquid; when the piezoelectric element 32 drives the vibrating diaphragm 31 to move towards the valve cover 2, the volume of the pump cavity 5 is compressed, so that the liquid in the pump cavity 5 is delivered outward; at this time, the first valve plate 41 abuts against the inflow port 11, the first boss 411 is in close connection with the inflow pipe 13 to block the delivery of the liquid to the inflow port 11, so that the liquid is forced to enter the outflow passage 22, the hydraulic pressure pushes open the second valve plate 42 and the second boss 421, enters the outflow port 12, and finally flows out of the outflow pipe 14 to complete the action of discharging the liquid.

[0070] The working process of the application is that the piezoelectric element 32 is driven by voltage to generate displacement, and cooperates with the first valve plate 41 and the second valve plate 42 which are one-way opened internally, so that the pump cavity 5 increases in volume to suck liquid from the inflow pipe 13, and decreases in volume to discharge liquid from the outflow pipe 14.

[0071] In summary, the embodiment of the application provides a fluid delivery device, which realizes one-way opening and double sealing of the inflow port 11 and the outflow port 12 through the structure of the first valve plate 41 and the second valve plate 42 in the valve diaphragm 4, combines the boss design and the application of the rounded surface, effectively prevents backflow, reduces wear and tear, and prolongs the service life; at the same time, the positioning member 15 and the positioning hole 23 are arranged to ensure the assembly accuracy of the valve seat 1 and the valve cover 2, and multiple sealing protection is provided through the overflow ring groove and the sealing ring 6, which effectively improves the forming accuracy, sealing performance and leakage prevention ability of the pump cavity 5. In addition, the optimized pipeline design further reduces the liquid flow resistance, improves the efficiency and uniformity of suction and discharge. The application realizes the functions of liquid delivery with high precision, high efficiency, high reliability, long service life and easy assembly, and is especially suitable for various fields which have strict requirements for micro-liquid control.

[0072] The above only describes the preferred embodiments of the application, and it should be noted that those skilled in the art can make several improvements and replacements without departing from the technical principles of the application, and these improvements and replacements should also be considered as the protection scope of the application.

Claims

1. A fluid delivery device, characterized by, The utility model relates to a valve seat, the valve cover, piezoelectric component, valve diaphragm and the valve diaphragm of valve diaphragm are arranged on the valve seat, and the valve diaphragm is arranged between the valve cover and the valve seat. The utility model discloses a valve seat, the valve cover, piezoelectric component, valve diaphragm and the valve diaphragm of valve diaphragm are arranged on the valve seat, and the valve diaphragm is arranged between the valve cover and the valve seat. The utility model discloses a valve seat, the valve cover, piezoelectric component, valve diaphragm and the valve diaphragm of valve diaphragm are arranged on the valve seat, and the valve diaphragm is arranged between the valve cover and the valve seat. The utility model discloses a valve seat, the valve cover, piezoelectric component, valve diaphragm and the valve diaphragm of valve diaphragm are arranged on the valve seat, and the valve diaphragm is arranged between the valve cover and the valve seat. The utility model discloses a valve seat, the valve cover, piezoelectric component, valve diaphragm and the valve diaphragm of valve diaphragm are arranged on the valve seat, and the valve diaphragm is arranged between the valve cover and the valve seat.

2. The fluid delivery device of claim 1, wherein, The utility model discloses a valve seat, the valve cover, piezoelectric component, valve diaphragm and the valve diaphragm of valve diaphragm are arranged on the valve seat, and the valve diaphragm is arranged between the valve cover and the valve seat. The utility model discloses a valve seat, the valve cover, piezoelectric component, valve diaphragm and the valve diaphragm of valve diaphragm are arranged on the valve seat, and the valve diaphragm is arranged between the valve cover and the valve seat.

3. The fluid delivery device of claim 1, wherein, The utility model discloses a valve seat, the valve cover, piezoelectric component, valve diaphragm and the valve diaphragm of valve diaphragm are arranged on the valve seat, and the valve diaphragm is arranged between the valve cover and the valve seat.

4. The fluid delivery device of claim 2, wherein, The utility model discloses a valve seat, the valve cover, piezoelectric component, valve diaphragm and the valve diaphragm of valve diaphragm are arranged on the valve seat, and the valve diaphragm is arranged between the valve cover and the valve seat. The utility model discloses a valve seat, the valve cover, piezoelectric component, valve diaphragm and the valve diaphragm of valve diaphragm are arranged on the valve seat, and the valve diaphragm is arranged between the valve cover and the valve seat. The utility model discloses a valve seat, the valve cover, piezoelectric component, valve diaphragm and the valve diaphragm of valve diaphragm are arranged on the valve seat, and the valve diaphragm is arranged between the valve cover and the valve seat. The utility model discloses a valve seat, the valve cover, piezoelectric component, valve diaphragm and the valve diaphragm of valve diaphragm are arranged on the valve seat, and the valve diaphragm is arranged between the valve cover and the valve seat. The utility model discloses a valve seat, the valve cover, piezoelectric component, valve diaphragm and the valve diaphragm of valve diaphragm are arranged on the valve seat, and the valve diaphragm is arranged between the valve cover and the valve seat. The utility model discloses a valve seat, the valve cover, piezoelectric component, valve diaphragm and the valve diaphragm of valve diaphragm are arranged on the valve seat, and the valve diaphragm is arranged between the valve cover and the valve seat. The utility model discloses a valve seat, the valve cover, piezoelectric component, valve diaphragm and the valve diaphragm of valve diaphragm are arranged on the valve seat, and the valve diaphragm is arranged between the valve cover and the valve seat. The utility model discloses a valve seat, the valve cover, piezoelectric component, valve diaphragm and the valve diaphragm of valve diaphragm are arranged on the valve seat, and the valve diaphragm is arranged between the valve cover and the valve seat. The utility model discloses a valve seat, the valve cover, piezoelectric component, valve diaphragm and the valve diaphragm of valve diaphragm are arranged on the valve seat, and the valve diaphragm is arranged between the valve cover and the valve seat. The utility model discloses a valve seat, the valve cover, piezoelectric component, valve diaphragm and the valve diaphragm of valve diaphragm are arranged on the valve seat, and the valve diaphragm is arranged between the valve cover and the valve seat. The utility model discloses a valve seat, the valve cover, piezoelectric component, valve diaphragm and the valve diaphragm of valve diaphragm are arranged on the valve seat, and the valve diaphragm is arranged between the valve cover and the valve seat. The utility model discloses a valve seat, the valve cover, piezoelectric component, valve diaphragm and the valve diaphragm of valve diaphragm are arranged on the valve seat, and the valve diaphragm is arranged between the valve cover and the valve seat. The utility model discloses a valve seat, the valve cover, piezoelectric component, valve diaphragm and the valve diaphragm of valve diaphragm are arranged on the valve seat, and the valve diaphragm is arranged between the valve cover and the valve seat. The utility model discloses a valve seat, the valve cover, piezoelectric component, valve diaphragm and the valve diaphragm of valve diaphragm are arranged on the valve seat, and the valve diaphragm is arranged between the valve cover and the valve seat. The utility model discloses a valve seat, the valve cover, piezoelectric component, valve diaphragm and the valve diaphragm of valve diaphragm are arranged on the valve seat, and the valve diaphragm is arranged between the valve cover and the valve seat. The utility model discloses a valve seat, the valve cover, piezoelectric component, valve diaphragm and the valve diaphragm of valve diaphragm are arranged on the valve seat, and the valve diaphragm is arranged between the valve cover and the valve seat. The utility model discloses a valve seat, the valve cover, piezoelectric component, valve diaphragm and the valve diaphragm of valve diaphragm are arranged on the valve seat, and the valve diaphragm is arranged between the valve cover and the valve seat. The utility model discloses a valve seat, the valve cover, piezoelectric component, valve diaphragm and the valve diaphragm of valve diaphragm are arranged on the valve seat, and the valve diaphragm is arranged between the valve cover and the valve seat. The utility model discloses a valve seat, the valve cover, piezoelectric component, valve diaphragm and the valve diaphragm of valve diaphragm are arranged on the valve seat, and the valve diaphragm is arranged between the valve cover and the valve seat. The utility model discloses a valve seat, the valve cover, piezoelectric component, valve diaphragm and the valve diaphragm of valve diaphragm are arranged on the valve seat, and the valve diaphragm is arranged between the valve cover and the valve seat. The utility model discloses a valve seat, the valve cover, piezoelectric component, valve diaphragm and the valve diaphragm of valve diaphragm are arranged on the valve seat, and the valve diaphragm is arranged between the valve cover and the valve seat. The utility model discloses a valve seat, the valve cover, piezoelectric component, valve diaphragm and the valve diaphragm of valve diaphragm are arranged on the valve seat, and the valve diaphragm is arranged between the valve cover and the valve seat. The utility model discloses a valve seat, the valve cover, piezoelectric component, valve diaphragm and the valve diaphragm of valve diaphragm are arranged on the valve seat, and the valve diaphragm is arranged between the valve cover and the valve seat. The utility model discloses a valve seat, the valve cover, piezoelectric component, valve diaphragm and the valve diaphragm of valve diaphragm are arranged on the valve seat, and the valve diaphragm is arranged between the valve cover and the valve seat. The utility model discloses a valve seat, the valve cover, piezoelectric component, valve diaphragm and the valve diaphragm of valve diaphragm are arranged on the valve seat, and the valve diaphragm is arranged between the valve cover and the valve seat. The utility model discloses a valve seat, the valve cover, piezoelectric component, valve diaphragm and the valve diaphragm of valve diaphragm are arranged on the valve seat, and the valve diaphragm is arranged between the valve cover and the valve seat. The utility model discloses a valve seat, the valve cover, piezoelectric component, valve diaphragm and the valve diaphragm of valve diaphragm are arranged on the valve seat, and the valve diaphragm is arranged between the valve cover and the valve seat. The utility model discloses a valve seat, the valve cover, piezoelectric component 5. The fluid delivery device of claim 1, wherein, The valve seat has a positioning member protruding towards the valve cover, and the valve cover has a positioning hole arranged towards the valve cover, and the positioning member is arranged in the positioning hole.

6. The fluid delivery device of claim 1, wherein, The piezoelectric assembly comprises a diaphragm and a piezoelectric element, the valve cover has oppositely arranged first and second surfaces, the inlet flow channel and the outlet flow channel both penetrate the first and second surfaces, the first surface has a recess in the center, and the first surface further has a connecting portion arranged around the recess, the connecting portion is arranged in close contact with the diaphragm so that the recess defines the pump cavity, and the piezoelectric element is arranged on the side of the diaphragm away from the first surface.

7. The fluid delivery device of claim 6, wherein The first surface further has a glue overflow ring groove arranged around the recess, and the connecting portion is arranged around the outer periphery of the glue overflow ring groove.

8. The fluid delivery device of claim 6, wherein, The second surface of the valve cover has a first sealing groove arranged around the inlet of the inlet flow channel and a second sealing groove arranged around the outlet of the outlet flow channel, and the first and second sealing grooves both have sealing rings arranged therein.

9. The fluid delivery device of claim 1, wherein, The inlet flow pipe comprises an inlet inner pipe and an inlet outer pipe, one end of the inlet inner pipe is in communication with the inlet port, the other end is in communication with the inlet outer pipe, the inner diameter of the inlet outer pipe gradually decreases towards the direction of the inlet inner pipe, and / or The outlet flow pipe comprises an outlet inner pipe and an outlet outer pipe, one end of the outlet inner pipe is in communication with the outlet port, the other end is in communication with the outlet outer pipe, and the inner diameter of the outlet outer pipe gradually decreases towards the direction of the outlet inner pipe.

10. The fluid delivery device of claim 1, wherein, The inner diameter of the inlet flow channel gradually increases towards the direction of the inlet port, and / or The inner diameter of the outlet flow pipe gradually increases towards the direction of the outlet port.

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