Floating annular diaphragm valve piezoelectric pump

Abstract

The invention discloses a floating annular diaphragm valve piezoelectric pump which comprises a pump body, a pump cover, an upper sealing ring, a piezoelectric vibrator, a lower sealing ring, a valve seat, an annular diaphragm valve, a bolt and a nut. When liquid passes through the annular diaphragm valve in the pump body, the annular diaphragm valve floats up and down in the cylindrical rod of the valve seat under the impact force of the liquid so as to be attached to or deviated from the fan-shaped thin hole of the valve seat, and then inflow and outflow of the liquid are controlled. The annular diaphragm valve can work by floating up and down under very small liquid impact force, so that the pump is large in output flow and not prone to fatigue failure, and meanwhile, the annular diaphragm valve is of a plane structure and is easy to microminiaturize.

Description

Technical Field

[0001] The invention belongs to the field of microfluid machinery, and in particular relates to a floating annular diaphragm valve piezoelectric pump. Background Art

[0002] A piezoelectric pump uses a piezoelectric oscillator as its power source. The mechanical vibration of the piezoelectric oscillator causes periodic changes in the volume of the pump chamber. Under the influence of a pressure differential, the unequal flow resistance of the valve (in valveless piezoelectric pumps) or the movement of the valve (in valved piezoelectric pumps) is exploited to achieve unidirectional fluid transport. Compared to valveless piezoelectric pumps, valved piezoelectric pumps offer a higher output flow rate and hold great promise for practical applications in fluid transport applications such as water cooling and fuel delivery. Currently, valved piezoelectric pumps mostly use valve bodies such as ball valves and umbrella valves to transport fluids. While ball valve piezoelectric pumps are less susceptible to fatigue failure, their high opening pressure results in lower output flow rates. Umbrella valve piezoelectric pumps, while offering a higher output flow rate, are susceptible to fatigue failure due to repeated deformation of the valve body. Furthermore, the complex structure of the umbrella valve makes it difficult to miniaturize. Therefore, developing a valved piezoelectric pump that offers a high output flow rate, is less susceptible to fatigue failure, and is easily miniaturized is of great practical significance. Summary of the Invention

[0003] The purpose of the present invention is to provide a floating annular diaphragm valve piezoelectric pump, the annular diaphragm valve of the pump can work by floating up and down under very small liquid impact force, so that the pump has a large output flow and is not prone to fatigue failure. At the same time, the annular diaphragm valve has a planar structure and is easy to miniaturize.

[0004] To achieve the above purpose, the technical solution of the present invention is:

[0005] A floating annular diaphragm valve piezoelectric pump, characterized by comprising a pump cover, bolts, an upper sealing ring, a lower sealing ring, a piezoelectric vibrator, an annular diaphragm valve, a valve seat, a pump body and a nut;

[0006] The pump cover is provided with an annular flange structure, an upper sealing ring groove, and an upper bolt hole. The upper sealing ring groove is used to accommodate the upper sealing ring. The piezoelectric vibrator is composed of a metal base and a piezoelectric chip. The piezoelectric chip is a driving element made of piezoelectric ceramic material. The upper sealing ring is an annular rubber ring that plays the role of elastically supporting the piezoelectric vibrator.

[0007] The annular diaphragm valve comprises a diaphragm valve outer ring and a diaphragm valve inner hole; the valve seat comprises a conical boss with a cone angle of 60°, a cylindrical rod, and four fan-shaped holes of the same size; the diameter of the diaphragm valve outer ring is larger than the outer diameter of the fan-shaped holes, so that when the annular diaphragm valve is tightly fitted into the fan-shaped holes, liquid cannot pass through the fan-shaped holes; the diameter of the diaphragm valve inner hole is slightly larger than the diameter of the cylindrical rod, so that the annular diaphragm valve can float freely up and down in the cylindrical rod; the large end diameter of the conical boss is larger than the diameter of the diaphragm valve inner hole, so that the annular diaphragm valve floats within a limited distance; the small end diameter of the conical boss is smaller than the diameter of the diaphragm valve inner hole, so that the annular diaphragm valve can be easily installed in the cylindrical rod;

[0008] The pump body is provided with a lower bolt hole, a lower sealing ring groove, a flow channel outlet, an outlet annular step, an inlet annular step, and a flow channel inlet. The outlet annular step and the inlet annular step are used to place the valve seat. The outlet annular step faces the conical boss side of the valve seat, and the inlet annular step faces the fan-shaped fine hole side of the valve seat. The lower sealing ring is an annular rubber ring, which plays the role of sealing and elastically supporting the piezoelectric vibrator.

[0009] The bolts and nuts are connected by threads, and a tight fit between the pump cover and the pump body is achieved through the upper bolt holes of the pump cover and the lower bolt holes of the pump body.

[0010] The floating annular diaphragm valve piezoelectric pump includes two working processes: liquid suction and liquid discharge:

[0011] Liquid suction process: The piezoelectric vibrator deforms upward under the action of positive alternating current, the volume of the closed pump chamber increases, the pressure inside the pump chamber decreases, and the annular diaphragm valve on the outlet valve seat floats upward under the impact force of the liquid, fitting tightly into the fan-shaped through-hole of the outlet valve seat, and the flow channel outlet is closed; at the same time, the annular diaphragm valve on the inlet valve seat floats upward under the impact force of the liquid, and the liquid flows into the pump chamber from the fan-shaped pores of the inlet valve seat.

[0012] Liquid discharge process: The piezoelectric vibrator deforms downward under the action of negative alternating current, the volume of the closed pump chamber decreases, the pressure inside the pump chamber increases, and the annular diaphragm valve on the inlet valve seat floats downward under the impact force of the liquid, fitting tightly against the fan-shaped through-hole of the inlet valve seat, and the flow channel inlet is closed; at the same time, the annular diaphragm valve on the outlet valve seat floats downward under the impact force of the liquid, and the liquid flows out from the fan-shaped holes of the outlet valve seat along the flow channel outlet.

[0013] The floating annular diaphragm valve piezoelectric pump works continuously in a cycle through the above-mentioned liquid suction process and liquid discharge process, thereby achieving unidirectional liquid transportation.

[0014] The outstanding advantages of this patent are:

[0015] 1. The annular diaphragm valve of the floating annular diaphragm valve piezoelectric pump of the present invention can float up and down under a very small liquid impact force, and the required opening pressure is small so that its output flow rate is large.

[0016] 2. The floating annular diaphragm valve piezoelectric pump of the present invention utilizes the up and down floating of the annular diaphragm valve rather than the deformation of the valve body to work, so it is not prone to fatigue failure, has stable output performance and a long service life.

[0017] 3. The annular diaphragm valve of the floating annular diaphragm valve piezoelectric pump of the present invention has a planar structure, is simple in structure, and can be easily miniaturized by injection molding. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is an exploded view of the floating annular diaphragm valve piezoelectric pump of the present invention;

[0019] Figure 2 is a half-sectional view of the floating annular diaphragm valve piezoelectric pump of the present invention;

[0020] Figure 3 It is a schematic structural diagram of the pump cover of the present invention;

[0021] Figure 4 It is a schematic diagram of the structure of the piezoelectric vibrator of the present invention;

[0022] Figure 5 It is a schematic diagram of the annular diaphragm structure of the present invention;

[0023] Figure 6 Schematic diagram of the valve seat structure of the present invention;

[0024] Figure 7 It is a schematic diagram of the pump structure of the present invention;

[0025] Markings in the figure: 1 is the pump cover, 1-1 is the annular flange structure, 1-2 is the upper sealing ring groove, 1-3 is the upper bolt hole, 2 is the bolt, 3 is the upper sealing ring, 4 is the lower sealing ring, 5 is the piezoelectric vibrator, 5-1 is the metal base, 5-2 is the piezoelectric chip, 6 is the annular diaphragm valve, 6-1 is the outer ring of the diaphragm valve, 6-2 is the inner hole of the diaphragm valve, 7 is the valve seat, 7-1 is the conical boss, 7-2 is the cylindrical rod, 7-3 is the fan-shaped pore, 8 is the pump body, 8-1 is the lower bolt hole, 8-2 is the lower sealing ring groove, 8-3 is the flow channel outlet, 8-4 is the outlet annular step, 8-5 is the inlet annular step, 8-6 is the flow channel inlet, and 9 is the nut. DETAILED DESCRIPTION

[0026] The technical solution of the present invention is clearly and completely described below in conjunction with the accompanying drawings and embodiments. Obviously, the embodiments are only part of the embodiments of the present invention, not all of the embodiments; based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present invention; the description in this section is only exemplary and explanatory and should not have any limiting effect on the scope of protection of the present invention.

[0027] See Figure 1-7 , a floating annular diaphragm valve piezoelectric pump, characterized by comprising: a pump cover (1), a bolt (2), an upper sealing ring (3), a lower sealing ring (4), a piezoelectric vibrator (5), an annular diaphragm valve (6), a valve seat (7), a pump body (8) and a nut (9);

[0028] The pump cover (1) is provided with an annular flange structure (1-1), an upper sealing ring groove (1-2), and an upper bolt hole (1-3); the upper sealing ring groove (1-2) is used to place the upper sealing ring (3); the piezoelectric vibrator (5) is composed of a metal base (5-1) and a piezoelectric chip (5-2); the piezoelectric chip (5-2) is a driving element of a piezoelectric ceramic material; the upper sealing ring (3) is an annular rubber ring, which plays the role of elastically supporting the piezoelectric vibrator (5);

[0029] The annular diaphragm valve (6) comprises a diaphragm valve outer ring (6-1) and a diaphragm valve inner hole (6-2); the valve seat (7) comprises a conical boss (7-1) with a cone angle of 60°, a cylindrical rod (7-2), and four fan-shaped fine holes (7-3) of the same size; the diameter of the diaphragm valve outer ring (6-1) is larger than the outer diameter of the fan-shaped fine holes (7-3), so that when the annular diaphragm valve (6) is tightly fitted with the fan-shaped fine holes (7-3), liquid cannot pass through the fan-shaped fine holes (7-3); the diaphragm valve The diameter of the inner hole (6-2) is slightly larger than the diameter of the cylindrical rod (7-2), so that the annular diaphragm valve (6) can float freely up and down in the cylindrical rod (7-2); the diameter of the large end of the conical boss (7-1) is larger than the diameter of the inner hole (6-2) of the diaphragm valve, so that the annular diaphragm valve (6) floats within a limited distance; the diameter of the small end of the conical boss (7-1) is smaller than the diameter of the inner hole (6-2) of the diaphragm valve, so that the annular diaphragm valve (6) can be installed in the cylindrical rod (7-2);

[0030] The pump body (8) is provided with a lower bolt hole (8-1), a lower sealing ring groove (8-2), a flow channel outlet (8-3), an outlet annular step (8-4), an inlet annular step (8-5), and a flow channel inlet (8-6); the outlet annular step (8-4) and the inlet annular step (8-5) are used to place the valve seat (7); the outlet annular step (8-4) faces the side of the conical boss (7-1) of the valve seat (7); the inlet annular step (8-5) faces the side of the fan-shaped fine hole (7-3) of the valve seat (7); the lower sealing ring (4) is an annular rubber ring, which plays the role of sealing and elastically supporting the piezoelectric vibrator (5);

[0031] The bolts (2) and nuts (9) are threadedly connected, and a tight fit between the pump cover (1) and the pump body (8) is achieved through the upper bolt holes (1-3) of the pump cover (1) and the lower bolt holes (8-1) of the pump body (8).

[0032] The floating annular diaphragm valve piezoelectric pump includes two working processes: liquid suction and liquid discharge:

[0033] Liquid suction process: the piezoelectric vibrator (5) deforms upward under the action of the positive alternating current, the volume of the closed pump chamber increases, the pressure inside the pump chamber decreases, and the annular diaphragm valve (6) on the outlet valve seat (7) floats upward under the impact of the liquid, closely fitting the fan-shaped through hole (7-3) of the outlet valve seat (7), and the flow channel outlet (8-3) is closed; at the same time, the annular diaphragm valve (6) on the inlet valve seat (7) floats upward under the impact of the liquid, and the liquid flows into the pump chamber from the fan-shaped fine hole (7-3) of the inlet valve seat (7).

[0034] Liquid discharge process: the piezoelectric vibrator (5) is deformed downward under the action of negative alternating current, the volume of the closed pump chamber decreases, the pressure inside the pump chamber increases, and the annular diaphragm valve (6) on the inlet valve seat (7) floats downward under the impact of the liquid, closely fitting the fan-shaped through hole (7-3) of the inlet valve seat (7), and the flow channel inlet (8-6) is closed; at the same time, the annular diaphragm valve (6) on the outlet valve seat (7) floats downward under the impact of the liquid, and the liquid flows out from the fan-shaped fine hole (7-3) of the outlet valve seat (7) along the flow channel outlet (8-3).

[0035] The floating annular diaphragm valve piezoelectric pump works continuously in a cycle through the above-mentioned liquid suction process and liquid discharge process, thereby achieving unidirectional liquid transportation.

Claims

1. A floating annular diaphragm valve piezoelectric pump, characterized in that: It includes a pump cover (1), bolts (2), an upper sealing ring (3), a lower sealing ring (4), a piezoelectric vibrator (5), an annular diaphragm valve (6), a valve seat (7), a pump body (8) and a nut (9).

2. The floating annular diaphragm valve piezoelectric pump according to claim 1, characterized in that: The pump cover (1) is provided with an annular flange structure (1-1), an upper sealing ring groove (1-2), and an upper bolt hole (1-3); the upper sealing ring groove (1-2) is used to place the upper sealing ring (3); the piezoelectric vibrator (5) is composed of a metal base (5-1) and a piezoelectric chip (5-2); the piezoelectric chip (5-2) is a driving element of a piezoelectric ceramic material; the upper sealing ring (3) is an annular rubber ring, which plays the role of elastically supporting the piezoelectric vibrator (5).

3. The floating annular diaphragm valve piezoelectric pump according to claim 1, characterized in that: The annular diaphragm valve (6) comprises a diaphragm valve outer ring (6-1) and a diaphragm valve inner hole (6-2); the valve seat (7) comprises a conical boss (7-1) with a cone angle of 60°, a cylindrical rod (7-2), and four fan-shaped fine holes (7-3) of the same size; the diameter of the diaphragm valve outer ring (6-1) is larger than the outer diameter of the fan-shaped fine holes (7-3), so that when the annular diaphragm valve (6) is tightly fitted with the fan-shaped fine holes (7-3), liquid cannot pass through the fan-shaped fine holes (7-3); the diaphragm valve The diameter of the inner hole (6-2) is slightly larger than the diameter of the cylindrical rod (7-2), so that the annular diaphragm valve (6) can float freely up and down in the cylindrical rod (7-2); the large end diameter of the conical boss (7-1) is larger than the diameter of the inner hole (6-2) of the diaphragm valve, so that the annular diaphragm valve (6) floats within a limited distance; the small end diameter of the conical boss (7-1) is smaller than the diameter of the inner hole (6-2) of the diaphragm valve, so that the annular diaphragm valve (6) can be installed in the cylindrical rod (7-2).

4. The floating annular diaphragm valve piezoelectric pump according to claim 1, characterized in that: The pump body (8) is provided with a lower bolt hole (8-1), a lower sealing ring groove (8-2), a flow channel outlet (8-3), an outlet annular step (8-4), an inlet annular step (8-5), and a flow channel inlet (8-6). The outlet annular step (8-4) and the inlet annular step (8-5) are used to place the valve seat (7). The outlet annular step (8-4) faces one side of the conical boss (7-1) of the valve seat (7), and the inlet annular step (8-5) faces one side of the fan-shaped fine hole (7-3) of the valve seat (7). The lower sealing ring (4) is an annular rubber ring, which plays the role of sealing and elastically supporting the piezoelectric vibrator (5).

5. The floating annular diaphragm valve piezoelectric pump according to claim 1, characterized in that: The bolts (2) and nuts (9) are threadedly connected, and a tight fit between the pump cover (1) and the pump body (8) is achieved through the upper bolt holes (1-3) of the pump cover (1) and the lower bolt holes (8-1) of the pump body (8).

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