Valveless piezoelectric pump simulating Crassica muscosa blade structure and control method of valveless piezoelectric pump

Abstract

The invention discloses a valveless piezoelectric pump simulating a Crassica muscosa blade structure and a control method of the valveless piezoelectric pump, particularly relates to the technical field of fluid machinery, and solves the technical problems of low pump flow, low output pressure and backflow of a valveless piezoelectric pump in the prior art. According to the technical scheme, a row of imitated Crassica muscosa blade structures are placed between an inlet flow channel and an outlet flow channel to form forward and reverse flow resistance difference, one-way flow is formed, and the function of the pump is achieved; in addition, the imitated Crassica muscisa blade structure provided by the invention can promote the forward flow of the liquid and hinder the reverse flow of the liquid, so that the backflow phenomenon of the liquid is inhibited, and the flow of the valveless piezoelectric pump is increased.

Description

Technical Field

[0001] The invention relates to the technical field of fluid machinery, and in particular to a valveless piezoelectric pump with a Crassula muscosa-like blade structure and a control method thereof. Background Art

[0002] A piezoelectric pump is a new type of fluid transfer device that utilizes the reciprocating motion of a piezoelectric vibrator combined with a flow resistance difference structure. It has the advantages of simple structure, low operating noise, and stable performance. It is widely used in microfluidics, chemical analysis, biomedicine, and other fields. According to the type of "valve", piezoelectric pumps can be divided into valved piezoelectric pumps and valveless piezoelectric pumps. A valved piezoelectric pump has a movable valve body, which enables unidirectional flow of liquid by opening and closing the valve. A valved piezoelectric pump usually has a large flow rate and no backflow, but when the driving frequency is high, the piezoelectric pump will experience dynamic balance, and the pump flow rate will quickly drop to zero, resulting in "pump-valve hysteresis."

[0003] There is no physical valve structure inside the valveless piezoelectric pump, which can effectively avoid "pump-valve hysteresis", and the valveless piezoelectric pump has a simpler structure and is easy to miniaturize. According to the different flow resistance structures, the valveless piezoelectric pump can be divided into a conical flow tube valveless piezoelectric pump, a Y-shaped flow tube valveless piezoelectric pump, an arc flow tube valveless piezoelectric pump, etc. However, the valveless piezoelectric pump has low pump flow, low output pressure and backflow, which limits its first step of promotion.

[0004] Bionics is a recently emerging discipline that has been widely used in various fields. The application of bionics in the field of valveless piezoelectric pumps has been involved, such as the fishtail valveless piezoelectric pump invented to imitate the movement of fish, and the fish scale structure valveless piezoelectric pump that imitates fish scales. However, the current application of bionics in the field of valveless piezoelectric pumps is far from meeting the needs of scientific and technological development. Therefore, the research on the application of bionics in the field of valveless piezoelectric pumps is of great significance. Summary of the invention

[0005] Therefore, the present invention solves the technical problems of low pump flow, low output pressure and backflow in the prior art valveless piezoelectric pump; the valveless piezoelectric pump with a Crassula muscosa imitation blade structure and the control method thereof provided by the present invention promote the forward flow of the liquid, hinder the reverse flow of the liquid, thereby suppressing the backflow of the liquid and increasing the flow of the valveless piezoelectric pump.

[0006] The inventive concept of the present invention is to form a positive and reverse flow resistance difference by placing a row of Crassula muscosa-like blade structures in the middle of the inlet and outlet flow channels, forming a unidirectional flow and realizing the function of a pump; the Crassula muscosa blade structure refers to a plant blade structure called Qingsuolong, and there are concave angles on both sides of the Crassula muscosa-like blade structure, which will form a non-homogeneous liquid meniscus. When the front edge of the non-homogeneous liquid meniscus reaches the adjacent Crassula muscosa blade, the liquid will quickly pass through the Crassula muscosa blade under the action of capillary force (at this time, the average transmission speed of the liquid is 20 times that of usual), while the flow of the liquid in other directions will be blocked, which can promote the forward flow of the liquid, hinder the directional flow of the liquid, and then suppress the reflux phenomenon of the liquid, thereby increasing the flow rate of the valveless piezoelectric pump.

[0007] The present invention provides a valveless piezoelectric pump with a Crassula muscosa-like blade structure, comprising a pump seat, a pump cover is arranged above the pump seat, a gasket is arranged between the pump cover and the pump seat; a piezoelectric vibrator is arranged between the gasket and the pump cover; and a Crassula muscosa-like blade structure is arranged in the pump seat. The pump cover and the pump seat can be made by 3D printing. The gasket is placed above the pump seat to seal the flow channel; the piezoelectric vibrator is placed above the gasket; the pump cover is installed above the piezoelectric vibrator, and the countersunk hole surface is in contact with the piezoelectric vibrator.

[0008] Furthermore, an inlet pipe and an outlet pipe are connected to both ends of the pump seat respectively; the inlet pipe and the outlet pipe are respectively communicated with an inlet flow channel and an outlet flow channel opened in the pump seat; a pump cavity is opened in the pump seat, and both sides of the pump cavity are respectively communicated with the inlet flow channel and the outlet flow channel; the inlet flow channel and the outlet flow channel are provided with a Crassula muscosa imitation blade structure.

[0009] Furthermore, the Crassula muscosa imitation blade structure comprises a structural side surface, a structural mounting surface and a structural bottom surface; the structural mounting surface of the Crassula muscosa imitation blade structure is fixed between the water inlet flow channel and the water outlet flow channel.

[0010] Furthermore, the angle between the side surface of the structure and the bottom surface of the inlet flow channel and the outlet flow channel is θ1; the angle between the bottom surface of the structure and the bottom surface of the inlet flow channel and the outlet flow channel is θ2; the inlet flow channel and the outlet pipe flow channel are each provided with 4 Crassula muscosa imitation blade structures, and the installation directions remain consistent; the spacing between each Crassula muscosa imitation blade structure is d.

[0011] Furthermore, the height of the Crassula muscosa imitation blade structure is less than the depth of the water inlet flow channel and the water outlet pipe flow channel.

[0012] Furthermore, the gasket is provided with a gasket through hole and a gasket screw hole; the pump cover is provided with a pump cover screw hole and a pump cover through hole; the pump seat is provided with a pump seat screw hole; the pump cover, the gasket and the pump seat are connected by screws and nuts; the screws pass through the pump cover screw holes, the gasket screw holes and the pump seat screw holes. The center of the pump cavity on the pump body, the center of the gasket through hole on the gasket, the center of the piezoelectric vibrator, the center of the washer, the countersunk hole on the pump cover and the center of the pump cover through hole are at the same position; the screw passes through the pump seat bolt hole, the gasket screw hole, the pump cover screw hole and the nut to play a clamping role; the metal ring is located between the pump cover and the screw to protect the pump cover.

[0013] Furthermore, the pump cover is provided with a pump cover countersunk hole, and a piezoelectric vibrator is provided in the pump cover countersunk hole. The pump cover is installed above the piezoelectric vibrator, and the countersunk hole surface contacts the piezoelectric vibrator; the gasket is located between the piezoelectric vibrator and the pump cover to play a sealing role.

[0014] Furthermore, the piezoelectric vibrator includes a piezoelectric ceramic and a substrate; the diameter of the piezoelectric ceramic is smaller than the diameter of the substrate; the piezoelectric vibrator is used to generate deformation under the stimulation of a driving signal, causing a change in the volume of the pump chamber, so that the liquid generates a unidirectional flow. The piezoelectric ceramic and the substrate can be bonded and fixed by AB glue.

[0015] The present invention also provides a control method based on the above-mentioned valveless piezoelectric pump with a Crassula muscosa-like blade structure, comprising the following steps:

[0016] S1: The driving voltage gradually increases, and the piezoelectric vibrator gradually bends upward from the equilibrium position to the extreme position. At this time, the volume of the pump chamber is also gradually increasing, the internal pressure decreases, and the liquid flows into the pump chamber from the inlet flow channel and the outlet flow channel respectively;

[0017] S2: The driving voltage gradually decreases, the piezoelectric vibrator gradually moves from the upper limit position to the equilibrium position, the volume of the pump chamber gradually decreases, the internal pressure gradually increases, and the liquid flows out of the pump chamber from the inlet flow channel and the outlet flow channel respectively;

[0018] S3: The driving voltage gradually increases, the piezoelectric vibrator gradually bends downward from the equilibrium position to the extreme position, the volume of the pump chamber continues to decrease, the internal pressure continues to increase, and the liquid continues to flow out of the pump chamber from the water inlet flow channel and the water outlet flow channel respectively;

[0019] S4: The driving voltage gradually decreases, the piezoelectric vibrator moves from the lower limit position to the equilibrium position, the volume of the pump chamber gradually decreases, the internal pressure gradually increases, and the liquid flows into the pump chamber from the inlet flow channel and the outlet flow channel respectively.

[0020] In the above technical solution, the technical effects and advantages provided by the present invention are:

[0021] 1. The invention proposes a valveless piezoelectric pump with a Crassula muscosa-like blade structure, which forms a positive and reverse flow resistance difference by placing a row of Crassula muscosa-like blade structures between the inlet and outlet flow channels, forming a unidirectional flow and realizing the function of a pump.

[0022] 2. The Crassula muscosa-like blade structure of the valveless piezoelectric pump proposed in the present invention can rely on the formation of a non-homogeneous liquid meniscus at the concave corners on both sides to promote the liquid to flow into the pump chamber from the water inlet flow channel, hinder the liquid from flowing into the pump chamber from the water outlet flow channel, hinder the liquid from flowing out of the pump chamber from the water inlet flow channel, and promote the liquid to flow out of the pump chamber from the water outlet flow channel; accordingly, the backflow of the liquid can be effectively suppressed, and combined with the flow resistance difference effect of the Crassula muscosa-like blade structure, the flow rate of the piezoelectric pump can be increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0024] Figure 1 It is a schematic diagram of an explosion of the piezoelectric pump of the present invention;

[0025] Figure 2 This is a schematic diagram of the pump cover structure of the present invention;

[0026] Figure 3 This is an isometric view of the piezoelectric vibrator of the present invention;

[0027] Figure 4 It is a schematic diagram of the gasket structure of the present invention;

[0028] Figure 5 This is a diagram of the structure of the Crassula muscosa leaf imitation of the present invention;

[0029] Figure 6 This is a structural diagram of the pump seat of the present invention;

[0030] Figure 7 A top view and a partial enlarged view of the installation of the Crassula muscosa imitation blade structure of the present invention;

[0031] Figure 8A side view and a partial enlarged view of the installation of the Crassula muscosa imitation blade structure of the present invention;

[0032] Fig. 9 This is a working principle diagram of the piezoelectric pump of the present invention.

[0033] Description of reference numerals:

[0034] 1. Screws; 2. Metal rings; 3. Pump cover; 4. Washers; 5. Piezoelectric vibrator; 6. Gaskets; 7. Crassula muscosa-like blade structure; 8. Pump seat; 9. Nuts; 30. Pump cover screw holes; 31. Pump cover countersunk holes; 32. Pump cover through holes; 50. Piezoelectric ceramics; 51. Substrate; 60. Gasket screw holes; 61. Gasket through holes; 70. Structural side surfaces; 71. Structural mounting surfaces; 72. Structural bottom surfaces; 80. Water inlet pipe; 81. Water inlet flow channel; 82. Pump cavity; 83. Pump seat screw holes; 84. Water outlet flow channel; 85. Water outlet pipe. DETAILED DESCRIPTION

[0035] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0036] Embodiment 1:

[0037] like Figure 1 As shown, this embodiment provides a valveless piezoelectric pump with a Crassula muscosa imitation blade structure, including a screw 1, a metal ring 2, a pump cover 3, a gasket 4, a piezoelectric vibrator 5, a spacer 6, a Crassula muscosa imitation blade structure 7, a pump seat 8, and a nut 9.

[0038] like Figure 2 The pump cover 3 described in the present invention is shown, including a pump cover screw hole 30, a pump cover countersunk hole 31, and a pump cover through hole 32; the pump cover is made by 3D printing.

[0039] like Figure 3 As shown, the piezoelectric vibrator 5 includes a piezoelectric ceramic 50 and a substrate 51; the piezoelectric ceramic 50 and the substrate 51 are bonded and fixed by AB glue; the diameter of the piezoelectric ceramic 50 is smaller than the diameter of the substrate 51; the piezoelectric vibrator 5 is deformed under the stimulation of the driving signal, thereby causing the volume of the pump chamber 82 to change, thereby causing the liquid to flow in one direction.

[0040] like Figure 4 As shown, the gasket 6 described in the present invention includes a gasket screw hole 60 and a gasket through hole 61.

[0041] like Figure 5As shown, the Crassula muscosa imitation blade structure 7 of the present invention comprises a structure side surface 70, a structure mounting surface 71, and a structure bottom surface 72; the Crassula muscosa imitation blade structure is manufactured by 3D printing.

[0042] like Figure 6 The figure shows the pump seat 8 described in the present invention, including an inlet pipe 80, an inlet flow channel 81, a pump cavity 82, a pump seat screw hole 83, an outlet flow channel 84, and an outlet pipe 85; one end of the inlet flow channel 81 is connected to the inlet pipe 80, and the other end is connected to the pump cavity 82; one end of the outlet flow channel 84 is connected to the outlet pipe 85, and the other end is connected to the pump cavity 82; the pump seat is made by 3D printing.

[0043] like Figure 7 , Figure 8 The figure shows a top view, a side view and a partial enlarged view of the installation of the Crassula muscosa imitation blade structure 7 of the present invention; the Crassula muscosa imitation blade structure 7 is fixed in the middle of the water inlet flow channel 81 and the water outlet flow channel 84 through the structure installation surface 71; the angle between the structure side surface 70 and the water inlet flow channel 81 and the water outlet flow channel 84 is θ1; the angle between the structure bottom surface 72 and the water inlet flow channel 81 and the water outlet flow channel 84 is θ2; the water inlet flow channel 81 and the outlet pipe flow channel 84 are each installed with 4 Crassula muscosa imitation blade structures 7, and the installation direction remains consistent; the spacing between each Crassula muscosa imitation blade structure 7 is d; the height of the Crassula muscosa imitation blade structure 7 should be less than the depth of the water inlet flow channel 81 and the outlet pipe flow channel 84.

[0044] The working cycle of the bionic valveless piezoelectric pump is T, and its working process is as follows:

[0045] In the period of 0 to T / 4, the driving voltage gradually increases, and the piezoelectric vibrator 5 gradually bends upward from the equilibrium position to the limit position. At this time, the volume of the pump chamber 82 is also gradually increasing, and the internal pressure is reduced. The liquid flows into the pump chamber 82 from the water inlet flow channel 81 and the water outlet flow channel 84 respectively; at this time, due to the flow resistance difference of the Crassula muscosa-like blade structure 7, the flow rate Q from the water inlet flow channel 81 to the pump chamber 82 is 1in流阻差 It must be greater than the flow rate Q of the water outlet channel 84 flowing into the pump chamber 82 2in流阻差In addition, since a non-homogeneous liquid meniscus is formed at the concave corners on both sides of the imitation Crassula muscosa blade structure 7, when the front edge of the non-homogeneous liquid meniscus reaches the adjacent Crassula muscosa blade, the liquid will quickly pass through the Crassula muscosa blade under the action of capillary force (the average transmission speed of the liquid is 20 times that of the usual), and the flow of the liquid in other directions will be blocked. Therefore, the flow rate Q flowing from the water inlet flow channel 81 into the pump chamber 82 under the action of the non-homogeneous liquid meniscus is 1in非均质 It is much larger than the flow rate Q of the outlet flow channel 84 flowing into the pump chamber 82 2in非均质 ;

[0046] In the period of T / 4 to T / 2, the driving voltage gradually decreases, the piezoelectric vibrator 5 gradually moves from the upper limit position to the equilibrium position, the volume of the pump chamber 82 gradually decreases, the internal pressure gradually increases, and the liquid flows out of the pump chamber 82 from the water inlet flow channel 81 and the water outlet flow channel 84 respectively; at this time, due to the flow resistance difference of the Crassula muscosa imitation blade structure 7, the flow rate Q flowing out of the pump chamber 82 from the water inlet flow channel 81 is 1out流阻差 It must be smaller than the flow rate Q of the water outlet channel 84 out of the pump chamber 82 2out流阻差 In addition, due to the effect of the inhomogeneous liquid meniscus, the flow rate Q flowing out of the pump chamber 82 from the water inlet flow channel 81 is 1out非均质 It is much smaller than the flow rate Q of the water outlet channel 84 out of the pump chamber 82. 2out非均质 ;

[0047] In the period of T / 2 to 3T / 4, the driving voltage gradually increases, the piezoelectric vibrator 5 gradually bends downward from the equilibrium position to the limit position, the volume of the pump chamber 82 continues to decrease, the internal pressure continues to increase, and the liquid continues to flow out of the pump chamber 82 from the water inlet flow channel 81 and the water outlet flow channel 84 respectively; at this time, due to the flow resistance difference of the Crassula muscosa imitation blade structure 7, the flow rate Q out of the pump chamber 82 from the water inlet flow channel 81 is 1out流阻差 It should be smaller than the Q of the water flowing out of the pump chamber 82 through the outlet flow channel 84. 2out流阻差 In addition, due to the effect of the inhomogeneous liquid meniscus, the flow rate Q flowing out of the pump chamber 82 from the water inlet flow channel 81 is 1out非均质 It is much smaller than the flow rate Q of the water outlet channel 84 out of the pump chamber 82. 2out非均质 ;

[0048] In the 3T / 4~T period, the driving voltage gradually decreases, the piezoelectric vibrator 5 moves from the lower limit position to the equilibrium position, the volume of the pump chamber 82 gradually decreases, the internal pressure gradually increases, and the liquid flows into the pump chamber 82 from the water inlet flow channel 81 and the water outlet flow channel 84 respectively; at this time, due to the flow resistance difference of the Crassula muscosa-like blade structure 7, the flow rate Q from the water inlet flow channel 81 to the pump chamber 82 is1in流阻差 It must be greater than the flow rate Q of the water outlet flow channel 84 flowing into the pump chamber 82 2in流阻差 In addition, due to the effect of the inhomogeneous liquid meniscus, the flow rate Q of the liquid flowing from the water inlet flow channel 81 into the pump chamber 82 1in非均质 It is much larger than the flow rate Q of the outlet flow channel 84 flowing into the pump chamber 82 2in非均质 ;

[0049] In one cycle, the flow rate of the piezoelectric pump flowing from the water inlet flow channel 81 into the pump chamber 82 is greater than the flow rate of the water outlet flow channel 84 flowing into the pump chamber 82; the flow rate of the piezoelectric pump flowing out of the pump chamber 82 from the water inlet flow channel 81 is less than the flow rate of the water outlet flow channel 84 flowing out of the pump chamber 82; therefore, the pump flow rate of one cycle can be expressed as:

[0050] Q=(Q 1in流阻差 -Q 2in流阻差 )+(Q 1in非均质 -Q 2in非均质 )+(Q 2out流阻差 -Q 1out流阻差 )+(Q 2out非均质 -Q 1out非均质 )

[0051] Therefore, the conventional valveless piezoelectric pump usually has a low pump flow rate due to the backflow phenomenon, and is not applicable to some fields requiring a higher pump flow rate. However, the valveless piezoelectric pump with the imitation Crassula muscosa blade structure of the present invention forms a non-homogeneous liquid meniscus at the concave corners on both sides due to the imitation Crassula muscosa blade structure 7. When the liquid flows from the water inlet flow channel 81 into the pump chamber 82, it promotes the flow of the liquid, and when it flows from the water outlet flow channel 84 into the pump chamber 82, it hinders the flow of the liquid. On the contrary, due to the imitation Crassula muscosa blade structure 7, when the liquid flows out of the pump chamber 82 from the water inlet flow channel 81, it hinders the flow of the liquid, and when it flows out of the pump chamber 82 from the water outlet flow channel 84, it promotes the flow of the liquid. Therefore, compared with the conventional valveless piezoelectric pump, the valveless piezoelectric pump with the imitation Crassula muscosa blade structure proposed by the present invention can significantly suppress the backflow phenomenon of the valveless piezoelectric pump, and at the same time significantly increase the pump flow rate.

[0052] Embodiment 2:

[0053] This embodiment provides a control method for a valveless piezoelectric pump based on the Crassula muscosa-like blade structure, comprising the following steps:

[0054] S1: The driving voltage gradually increases, and the piezoelectric vibrator 5 gradually bends upward from the equilibrium position to the limit position. At this time, the volume of the pump chamber 82 is also gradually increasing, and the internal pressure decreases. The liquid flows into the pump chamber 82 from the water inlet flow channel 81 and the water outlet flow channel 84 respectively;

[0055] S2: the driving voltage gradually decreases, the piezoelectric vibrator 5 gradually moves from the upper limit position to the equilibrium position, the volume of the pump chamber 82 gradually decreases, the internal pressure gradually increases, and the liquid flows out of the pump chamber 82 from the water inlet flow channel 81 and the water outlet flow channel 84 respectively;

[0056] S3: the driving voltage gradually increases, the piezoelectric vibrator 5 gradually bends downward from the equilibrium position to the limit position, the volume of the pump chamber 82 continues to decrease, the internal pressure continues to increase, and the liquid continues to flow out of the pump chamber 82 from the water inlet flow channel 81 and the water outlet flow channel 84 respectively;

[0057] S4: The driving voltage gradually decreases, the piezoelectric vibrator 5 moves from the lower limit position to the equilibrium position, the volume of the pump chamber 82 gradually decreases, the internal pressure gradually increases, and the liquid flows into the pump chamber 82 from the water inlet flow channel 81 and the water outlet flow channel 84 respectively.

[0058] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A valveless piezoelectric pump with a Crassula muscosa-like blade structure, characterized in that: The invention comprises a pump seat (8), a pump cover (3) is arranged above the pump seat (8), a gasket (6) is arranged between the pump cover (3) and the pump seat (8); a piezoelectric vibrator (5) is arranged between the gasket (6) and the pump cover (3); and a Crassula muscosa-imitating blade structure is arranged inside the pump seat (8).

2. The valveless piezoelectric pump with a Crassula muscosa-like blade structure according to claim 1, characterized in that: The two ends of the pump seat (8) are respectively connected to a water inlet pipe (80) and a water outlet pipe (85); the water inlet pipe (80) and the water outlet pipe (85) are respectively communicated with a water inlet flow channel (81) and a water outlet flow channel (84) provided in the pump seat (8); a pump chamber (82) is provided in the pump seat (8), and two sides of the pump chamber (82) are respectively communicated with the water inlet flow channel (81) and the water outlet flow channel (84); the water inlet flow channel (81) and the water outlet flow channel (84) are provided with a Crassula muscosa imitation blade structure.

3. The valveless piezoelectric pump with a Crassula muscosa-like blade structure according to claim 2, characterized in that: The Crassula muscosa imitation blade structure comprises a structural side surface (70), a structural mounting surface (71) and a structural bottom surface (72); the Crassula muscosa imitation blade structure structural mounting surface (71) is fixed in the middle of the water inlet flow channel (81) and the water outlet flow channel (84).

4. The valveless piezoelectric pump with a Crassula muscosa-like blade structure according to claim 3, characterized in that: The angle between the structural side surface (70) and the bottom surfaces of the water inlet flow channel (81) and the water outlet flow channel (84) is θ 1; the angle between the bottom surface of the structure (72) and the bottom surfaces of the water inlet flow channel (81) and the water outlet flow channel (84) is θ 2; the water inlet flow channel (81) and the water outlet pipe (85) flow channel are each provided with four Crassula muscosa imitation blade structures, and the installation directions are kept consistent; the spacing between each Crassula muscosa imitation blade structure is d.

5. The valveless piezoelectric pump with a Crassula muscosa-like blade structure according to claim 4, characterized in that: The height of the Crassula muscosa imitation blade structure is less than the depth of the water inlet flow channel (81) or the water outlet pipe (85) flow channel.

6. The valveless piezoelectric pump with a Crassula muscosa-like blade structure according to claim 5, characterized in that: The gasket (6) is provided with a gasket through hole (61) at the center, and gasket screw holes (60) are arranged around the gasket through hole (61); the pump cover (3) is provided with a pump cover through hole (32) at the center, and pump cover screw holes (30) are arranged around the pump cover through hole (32); the pump seat (8) is provided with a pump seat screw hole (83); the pump cover (3), the gasket (6) and the pump seat (8) are connected by screws (1) and nuts (9); the screws (1) pass through the pump cover screw hole (30), the gasket screw hole (60) and the pump seat screw hole (83).

7. The valveless piezoelectric pump with a Crassula muscosa-like blade structure according to claim 6, characterized in that: A metal ring (2) is arranged between the screw (1) and the top of the pump cover.

8. The valveless piezoelectric pump with a Crassula muscosa-like blade structure according to claim 7, characterized in that: The pump cover is provided with a pump cover countersunk hole (31), and a piezoelectric vibrator (5) is arranged in the pump cover countersunk hole (31); a gasket (4) is arranged between the piezoelectric vibrator (5) and the pump cover (3).

9. The valveless piezoelectric pump with a Crassula muscosa-like blade structure according to claim 8, characterized in that: The piezoelectric vibrator (5) comprises a piezoelectric ceramic (50) and a substrate (51); the diameter of the piezoelectric ceramic (50) is smaller than the diameter of the substrate (51); the piezoelectric vibrator (5) is used to generate deformation under the stimulation of a driving signal, causing a change in the volume of a pump chamber (82), thereby causing a unidirectional flow of liquid.

10. A control method for a valveless piezoelectric pump with a Crassula muscosa-like blade structure according to any one of claims 1 to 9, characterized in that: The steps include: S1: the driving voltage gradually increases, and the piezoelectric vibrator (5) gradually bends upward from the equilibrium position to the extreme position. At this time, the volume of the pump chamber (82) also gradually increases, the internal pressure decreases, and the liquid flows into the pump chamber (82) from the water inlet flow channel (81) and the water outlet flow channel (84) respectively; S2: the driving voltage gradually decreases, the piezoelectric vibrator (5) gradually moves from the upper limit position to the equilibrium position, the volume of the pump chamber (82) gradually decreases, the internal pressure gradually increases, and the liquid flows out of the pump chamber (82) from the water inlet flow channel (81) and the water outlet flow channel (84) respectively; S3: the driving voltage gradually increases, the piezoelectric vibrator (5) gradually bends downward from the equilibrium position to the extreme position, the volume of the pump chamber (82) continues to decrease, the internal pressure continues to increase, and the liquid continues to flow out of the pump chamber (82) from the water inlet flow channel (81) and the water outlet flow channel (84) respectively; S4: The driving voltage gradually decreases, the piezoelectric vibrator (5) moves from the lower limit position to the equilibrium position, the volume of the pump chamber (82) gradually decreases, the internal pressure gradually increases, and the liquid flows into the pump chamber (82) from the water inlet flow channel (81) and the water outlet flow channel (84) respectively.

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