A single-valve dual-chamber piezoelectric pump and working method thereof

Abstract

The present invention discloses a novel dual-chamber piezoelectric pump, including a hydraulic circulation device and a piezoelectric drive device, wherein the hydraulic circulation device includes a one-way valve and a cavity, wherein an inlet cavity and an outlet cavity are arranged in the cavity, wherein the one-way valve is arranged between the inlet cavity and the outlet cavity, wherein the one-way valve realizes one-way flow of fluid from the inlet cavity to the outlet cavity, wherein the piezoelectric drive device is externally connected to an alternating current, and wherein the piezoelectric drive device can adjust the pressure in the hydraulic circulation device. The piezoelectric pump structure of the present invention adopts a single-valve design, which has higher reliability and is convenient for assembly compared to the current dual-valve design and other structural designs; the flow of the fluid in the cavity is more regular, which effectively prevents or reduces the backflow of the fluid, and ultimately improves the pressure and flow output of the piezoelectric pump system; while reducing the volume and weight, the output performance of the pumped fluid can be effectively improved, and it has high practicality.

Description

Technical Field

[0001] The present invention relates to the technical field of piezoelectric pumps, and in particular to a single-valve dual-cavity piezoelectric pump and a working method thereof. Background Art

[0002] The rapid development of smart materials has provided a new approach to the design and development of small actuators with excellent performance. Among them, piezoelectric pumps driven by piezoelectric ceramics have broad application prospects in aerospace, mechanical construction, precision medicine and other fields due to their small size, high energy and high reliability.

[0003] Piezoelectric pumps can be divided into two categories based on whether they have valves in their structures: valved piezoelectric pumps and valveless piezoelectric pumps. Many existing technologies adopt valved structural designs, such as patent CN107476964A, the invention name of which is "A piezoelectric pump with integrated valve cavity", which discloses a piezoelectric pump with integrated valve cavity design, characterized in that the structural design includes upper and lower cover plates, pump cavity, piezoelectric vibrator, valve valve, one-way valve and other components, thereby increasing the effective space of the cavity, reducing the pump body structure, and increasing the pump flow, and can be used as a micro pump for conveying special media. During the working process of this type of valved piezoelectric pump, the fluid in the pump cavity and the fluid outside the pump cavity are mainly controlled by the active valve or the driven valve to circulate and flow to achieve a certain flow and pressure output. Some designs in the prior art still adopt valveless structures, such as patent CN106246516A, the invention name is "Funnel-shaped valveless piezoelectric pump", which discloses a funnel-shaped piezoelectric pump including a pump body, a piezoelectric vibrator, a bluff body, etc., forming a "Y"-shaped cross-section, which reduces the amount of fluid reflux and has a unidirectional pumping capability and a good pumping fluid effect. This type of valveless piezoelectric pump has no physical valve in the pump cavity. The suction and discharge of the fluid in the pump are both based on the pressure formed by the asymmetric structure of the pipeline or the pump cavity, forcing the fluid to flow in and out along the same flow channel, ultimately achieving the purpose of fluid transportation.

[0004] Compared with valved piezoelectric pumps of the same size, valveless piezoelectric pumps have disadvantages such as low flow, small back pressure, low efficiency and poor reverse flow stopping performance. In comparison, valved piezoelectric pumps have defects such as complex structure, difficult assembly and low reliability.

[0005] In view of the above-mentioned defects, the inventors of the present invention finally obtained the present invention after a long period of research and practice. Summary of the invention

[0006] In order to solve the above-mentioned technical defects, the technical solution adopted by the present invention is to provide a single-valve dual-chamber piezoelectric pump, including a hydraulic circulation device and a piezoelectric drive device, the hydraulic circulation device includes a one-way valve and a cavity, the cavity is provided with an inlet chamber and an outlet chamber, the one-way valve is arranged between the inlet chamber and the outlet chamber, the one-way valve realizes one-way flow of fluid from the inlet chamber to the outlet chamber, the piezoelectric drive device is externally connected to alternating current, and the piezoelectric drive device can adjust the pressure in the hydraulic circulation device.

[0007] Preferably, the number of the one-way valve is one.

[0008] Preferably, an outflow channel is provided between the outflow cavity and the one-way valve, an inflow channel is provided between the inflow cavity and the one-way valve, and the total cross-sectional area of ​​the outflow channels is smaller than the cross-sectional area of ​​the inflow channels.

[0009] Preferably, the hydraulic circulation device is further provided with an accumulator, and the accumulator is provided with an inlet, and the inlet is communicated with the inlet chamber.

[0010] Preferably, an accumulator partition is provided in the accumulator, and a spring / foam / nitrile rubber is provided on the inner side of the accumulator partition.

[0011] Preferably, the accumulator is sealedly connected to the cavity, the cavity is provided with an outlet, and the outlet is communicated with the outlet cavity.

[0012] Preferably, the piezoelectric drive device comprises a piston, a pump housing, and a piezoelectric ceramic, wherein the piezoelectric ceramic is built into the pump housing, one end of the piston is connected to the piezoelectric ceramic, and the other end of the piston is connected to the one-way valve.

[0013] Preferably, the piezoelectric ceramic is a high-voltage packaged piezoelectric ceramic, the piezoelectric ceramic is externally connected to an alternating current, and the piezoelectric ceramic performs a telescopic movement after being energized, thereby driving the piston to deform.

[0014] Preferably, the piezoelectric drive device further comprises a fixing member, wherein the fixing member respectively fixes the piezoelectric ceramic and the pump housing, and the fixing member plays a fixing role.

[0015] Preferably, the working method of the single-valve dual-chamber piezoelectric pump is:

[0016] S1, turning on the external power supply of the piezoelectric drive device, the piezoelectric drive device increases the pressure in the outlet cavity, at which time the one-way valve is closed, and the fluid in the outlet cavity flows out of the outlet cavity;

[0017] S2. When the pressure in the outlet chamber increases to a first preset value, the pressure driving device reduces the pressure in the outlet chamber. When the pressure in the outlet chamber decreases to a second preset value, the one-way valve opens, and the fluid flows from the inlet chamber into the outlet chamber. When the pressure value of the outlet chamber reaches a third preset value, the process of increasing pressure in step S1 is repeated to realize a cycle.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] 1. The piezoelectric pump structure of the present invention adopts a single valve design, which has higher reliability and is easy to assemble compared with the current double valve design and other structural designs;

[0020] 2. The present invention uses a dual-cavity design to make the fluid flow in the cavity more regular, effectively preventing or reducing fluid backflow, and ultimately improving the pressure and flow output of the piezoelectric pump system;

[0021] 3. The present invention connects the accumulator with the inlet chamber, making the structure more compact and simple, which is beneficial to the control of the pressure in the fluid flow chamber and the improved performance;

[0022] 4. The structural design of the present invention can effectively improve the output performance of the pumped fluid while reducing the volume and weight, and has high practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments.

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

[0025] Figure 2 is an exploded view of a hydraulic circulation device A of the present invention from a side perspective;

[0026] Figure 3 is an exploded view from a side view of a hydraulic circulation device B of the present invention;

[0027] Figure 4 is a schematic diagram of an accumulator of the present invention;

[0028] Figure 5 is a schematic diagram of the cavity of the present invention;

[0029] Figure 6 is a schematic diagram of the cavity and the one-way valve of the present invention;

[0030] Figure 7 is an exploded view of a piezoelectric drive device A of the present invention from a side perspective;

[0031] Figure 8is an exploded view of the piston A of the present invention from a side perspective;

[0032] Fig. 9 is an exploded view of the piston B of the present invention from a side perspective;

[0033] Fig.10 is a schematic diagram of a piston body of the present invention;

[0034] Fig.11 is a schematic diagram of a pump housing of the present invention;

[0035] Fig.12 is an exploded view from a side view of a piezoelectric drive device B of the present invention;

[0036] Fig.13 It is a schematic diagram of a fixing member of the present invention.

[0037] The numbers in the figure represent:

[0038] 1-hydraulic circulation device, 11-accumulator, 111-inlet, 112-first threaded hole, 113-first step surface, 114-first spacing surface, 115-first groove, 12-accumulator partition, 121-first inlet hole, 13-partition, 131-protrusion, 132-second inlet hole, 14-spacer, 141-first center hole, 15-cavity, 151-cavity connection end, 1511-second threaded hole, 1512-second step Surface, 1513-second spacing surface, 1514-third spacing surface, 1515-outflow channel, 1516-fourth spacing surface, 1517-third step surface, 1518-outflow cavity, 1519-third inflow hole, 152-valve connecting end, 1521-fourth step surface, 1522-fifth step surface, 1523-third threaded hole, 16-one-way valve, 161-valve plate, 1611-fourth threaded hole, 1612-one-way valve plate, 162 -valve, 1621-fifth threaded hole, 1622-flow hole, 2-piezoelectric drive device, 21-piston, 211-piston head, 2111-sixth step surface, 2112-sixth threaded hole, 212-sealing plate, 2121-second center hole, 2122-seventh threaded hole, 213-piston body, 2131-fifth spacing surface, 2132-sixth spacing surface, 2133-seventh step surface, 2134-eighth threaded hole, 2135- Piston hole, 22-pump housing, 221-eighth step surface, 222-ninth step surface, 223-first internal thread, 224-sealing surface, 225-side hole, 226-positioning groove, 227-third center hole, 228-driving cavity, 229-second internal thread, 23-piezoelectric ceramic, 231-bump, 232-positioning notch, 24-fixing piece, 241-positioning buckle, 242-positioning step, 25-back cover, 251-second external thread DETAILED DESCRIPTION

[0039] The above and other technical features and advantages of the present invention are described in more detail below in conjunction with the accompanying drawings.

[0040] Embodiment 1

[0041] like Figure 1 As shown, a single-valve dual-chamber piezoelectric pump includes a hydraulic circulation device 1 and a piezoelectric drive device 2. The hydraulic circulation device 1 and the piezoelectric drive device 2 are fixedly connected by threads. A sealing ring is provided on the B-side end face of the hydraulic circulation device 1. After the hydraulic circulation device 1 is fixedly connected to the piezoelectric drive device 2 by threads, the sealing ring can ensure the sealed contact between the hydraulic drive device 1 and the piezoelectric drive device 2.

[0042] like Figure 2 and Figure 3 As shown, the hydraulic circulation device 1 includes an accumulator 11, an accumulator partition 12, a partition 13, a spacer 14, a cavity 15 and a one-way valve 16. The accumulator 11 is a cylindrical container with a closed A side end and an open B side end. The accumulator 11 is made of 7075 aluminum alloy material. There is a cavity in the accumulator 11. An inlet 111 is opened on the side wall of the accumulator 11, and the fluid can flow into the cavity of the accumulator 11 through the inlet 111; the B side end face of the accumulator 11 matches the A side end face of the cavity 15, and the accumulator 11 is provided with a first threaded hole 112, which passes through the accumulator 11 in the AB direction, and there are four first threaded holes 112; a sealing ring is provided on the connecting surface of the accumulator 11 and the cavity 15, so that the accumulator 11 and the cavity 15 form a cavity, and the fluid in the above cavity will not flow into the accumulator 11. Leakage occurs at the connection with the cavity 15, ensuring that the hydraulic pressure in the cavity formed by the accumulator 11 and the cavity 15 is stable within the working range; the accumulator partition 12 is located in the cavity of the accumulator 11, and the accumulator partition 12 is made of 7075 aluminum alloy material. A first inlet hole 121 is provided on the accumulator partition 12. The diameter of the accumulator partition 12 is smaller than the diameter of the cavity of the accumulator 11, ensuring that an annular gap is left between the accumulator partition 12 and the inner wall of the accumulator 11, and the fluid can pass through the first inlet hole 121 and the above-mentioned annular gap, that is, the fluid is distributed on both sides of the accumulator partition 12 when the piezoelectric pump is working; when the accumulator partition 12 is placed in the accumulator 11, the A side of the accumulator partition 12 is the inner side of the accumulator partition 12, and nitrile rubber is placed on the inner end of the accumulator partition 12 to ensure the stability of the pressure in the accumulator 11.

[0043] like Figure 3 and Figure 4As shown, the B side end of the accumulator 11 is provided with a first step surface 113 and a first spacing surface 114, the first step surface 113 and the first spacing surface 114 are located in the same plane, a first groove 115 is provided between the first step surface 113 and the first spacing surface 114, and the first groove 115 is an annular groove; the partition 13 is a circular plate with the same diameter as the first step surface 113, and a protrusion 131 is provided on the B side of the partition 13, the protrusion 131 is cylindrical, and a second inlet hole 132 is provided at the axial position of the protrusion 131, and the second inlet hole 132 passes through the partition 13 in the AB direction, and the A side end face of the partition 13 is seamlessly fitted with the first step surface 113 and the first spacing surface 114, and a sealing ring is provided in the first groove 115, so that the partition 13 and the accumulator 11 remain sealed, and the accumulator 11 and the partition 13 are sealed.

[0044] like Figure 3 As shown, the spacer 14 is a circular piece, and a first center hole 141 is provided at the center of the spacer 14 . The first center hole 141 matches with the protrusion 131 . The protrusion 131 can pass through the first center hole 141 of the spacer 14 , and the spacer 14 fits tightly with the partition plate 13 .

[0045] like Figure 2 and Figure 5 As shown, the cavity 15 includes a cavity connection end 151 and a valve connection end 152. The cavity 15 is made of 7075 aluminum alloy material. One side of the A end of the cavity connection end 151 is provided with a second threaded hole 1511, a second step surface 1512, a second spacing surface 1513, a third spacing surface 1514, and a fourth spacing surface 1516. The second step surface 1512, the second spacing surface 1513, the third spacing surface 1514 and the fourth spacing surface 1516 are all located in the same plane. A sealing ring is provided between the second step surface 1512 and the second spacing surface 1513. An outflow cavity 1518 is provided between the second spacing surface 1513 and the third spacing surface 1514. The outflow cavity 1518 is provided in the outflow cavity 1518 in the AB direction. 8 outflow channels 1515, a sealing ring is provided between the third spacing surface 1514 and the fourth spacing surface 1516, a third step surface 1517 is provided in the fourth spacing surface 1516, a third inlet hole 1519 is provided in the third step surface 1517, the inner wall tolerance of the protruding nozzle 131 and the fourth spacing surface 1516 is matched, the third step surface 1517 is fitted with the B side of the protruding nozzle 1311, the second step surface 1512, the second spacing surface 1513, the third spacing surface 1514 and the fourth spacing surface 1516 are all fitted with the B side of the partition 13, and the sealing ring provided between the third spacing surface 1514 and the fourth spacing surface 1516 separates the outflow cavity 1518 from the third inlet hole 1519. An outflow port 153 is provided on the outside of the cavity 15, and the outflow port 153 is connected to the outflow cavity 1518.

[0046] like Figure 3 and Figure 5As shown, the diaphragm 14 is placed in the cavity connection end 151. The diaphragm 14 is made of spring steel. The diaphragm 14 is in close contact with the second step surface 1512, the second spacing surface 1513, the third spacing surface 1514 and the fourth spacing surface 1516. The protrusion 132 of the diaphragm 13 is inserted into the first center hole 141 of the diaphragm 14, and the B side of the diaphragm 13 is matched with the A side of the diaphragm 14. The accumulator diaphragm 12 is built into the cavity of the accumulator 11, and the B side of the accumulator 11 is in close contact with the A side of the cavity 15. By screwing screws in the first threaded hole 112 and the second threaded hole 1511, the accumulator 11 is fixedly connected to the cavity 15. After the accumulator 11 is connected to the cavity 15, the partition 13 and the partition 14 are fixed inside the accumulator 11 and the cavity 15. The inlet 111, the cavity inside the accumulator 11, the first inlet hole 121, the second inlet hole 132 and the third inlet hole 1519 are connected to form an inlet channel. The cross-sectional area of ​​the inlet channel is greater than the sum of the cross-sectional areas of the eight outflow channels 1518.

[0047] like Figure 6 As shown, a second groove 154 is provided on the side wall of the cavity 15 . There are two second grooves 154 . The second groove 154 is an annular groove surrounding the side wall of the cavity 15 . A sealing ring is provided in the second groove 154 . A first external thread 155 is provided on the side wall of the cavity 15 .

[0048] like Figure 2 and Figure 6 As shown, a fourth step surface 1521 and a fifth step surface 1522 are provided on the end surface of the valve connecting end 152, the fourth step surface 1521 is recessed in the B side of the valve connecting end 152, and eight outflow channels 1515 are provided on the fourth step surface 1521, and the outflow channels 1515 penetrate the cavity 15 in the AB direction; the fifth step surface 1522 is recessed in the fourth step surface 1521, and four third threaded holes 1523 are provided on the fifth step surface 1522, and a third inlet hole 1519 is provided at the center of the fifth step surface 1522, and the third inlet hole 1519 penetrates the cavity 15 in the AB direction.

[0049] like Figure 2 and Figure 6 As shown, the one-way valve 16 includes a valve plate 161 and a valve 162. The one-way valve 16 is made of 7075 aluminum alloy material. The valve plate 161 is a circular plate whose shape matches the shape of the fifth step surface 1522. The valve plate 161 is spring steel. Four fourth threaded holes 1611 are provided on the valve plate 161. The fourth threaded holes 1611 match the third threaded holes 1523. A one-way valve plate 1612 is provided at the center of the valve plate 161. The one-way valve plate 1612 ensures that the fluid in the third inlet hole 1519 can only flow in one direction.

[0050] like Figure 2 and Figure 6As shown, the shape of the valve 162 matches the shape of the fifth step surface 1522, and the valve 162 is provided with a fifth threaded hole 1621 and a flow hole 1622, the fifth threaded hole 1621 matches the third threaded hole 1523 and the fourth threaded hole 1611, the flow hole 1622 is located at the center of the valve 162, and the flow hole 1622 is connected to the third inlet hole 1519.

[0051] like Figure 2 and Figure 6 As shown, the valve plate 161 is installed into the circular hole formed by the fifth step surface 1522, and then the valve 162 is installed into the circular hole formed by the fifth step surface 1522, and the screws are tightened at the fifth threaded hole 1621, the fourth threaded hole 1611 and the third threaded hole 1523 to achieve a sealed connection between the valve 162 and the valve connecting end 152, and the function of one-way flow of the fluid is achieved here by the joint action of the valve plate 161 and the valve 162.

[0052] like Figure 7 As shown, the piezoelectric drive device 2 includes a piston 21, a pump housing 22, a piezoelectric ceramic 23, a fixing part 24 and a back cover 25; the back cover 25 is fixedly connected to the pump housing 22, the piezoelectric ceramic 23 and the fixing part 24 are both built into the B-side cavity of the pump housing 22, and the piston 21 is built into the A-side cavity of the pump housing 22.

[0053] like Figure 8 and Fig. 9 As shown, the piston 21 includes a piston head 211, a sealing sheet 212 and a piston body 213. The piston head 211 and the piston body 213 are both made of 7075 aluminum alloy. The A side of the piston head 211 is a flat surface without a depression. The middle of the B side of the piston head 211 is provided with a sixth step surface 2111. The sixth step surface 2111 has a certain elasticity. When a pressure difference is generated between the A side and the B side of the sixth step surface 2111, the sixth step surface 2111 will bulge toward the A side / B side. Four sixth threaded holes 2112 are provided on the B side of the plug head 211, and the diameter of the piston head 211 is larger than the diameter of the valve 162; the sealing sheet 212 is a circular thin sheet, and the sealing sheet 212 is spring steel. A second center hole 2121 is provided in the center of the sealing sheet 212, and the size of the second center hole 2121 is the same as the size of the sixth step surface 2111, and four seventh threaded holes 2122 are provided on the periphery of the second center hole 2121, and the seventh threaded hole 2122 matches the sixth threaded hole 2112.

[0054] like Figure 8 and Fig.10As shown, the piston body 213 includes a fifth spacing surface 2131, a sixth spacing surface 2132, and a seventh step surface 2133. The fifth spacing surface 2131 and the sixth spacing surface 2132 are located in the same plane. A sealing ring is provided on the outer side of the fifth spacing surface 2131, and a sealing ring is provided between the fifth spacing surface 2131 and the sixth spacing surface 2132. A seventh step surface 2133 is provided on the inner side of the sixth spacing surface 2132, and a piston hole 2135 is provided in the middle of the seventh step surface 2133; an eighth threaded hole 2134 is provided on the fifth spacing surface 2131, and the eighth threaded hole 2134 matches the seventh threaded hole 2122 and the sixth threaded hole 2112. The diameter of the piston body 213 is the same as that of the piston head 211. The piston head 211, the sealing sheet 212 and the piston body 213 are fixedly connected together by tightening screws at the sixth threaded hole 2112, the seventh threaded hole 2122 and the eighth threaded hole 2134 to form the piston 21.

[0055] like Fig.11 and Fig.12 As shown, the pump housing 22 is a cylindrical sleeve, and the A side end of the pump housing 22 is provided with an eighth step surface 221, a ninth step surface 222, a first internal thread 223 and a sealing surface 224, the first internal thread 223 and the sealing surface 224 are both located on the inner wall of the pump housing 22, the ninth step surface 222 is sunken into the eighth step surface 221, the eighth step surface 221 is an annular surface, the outer diameter of the eighth step surface 221 is larger than the diameter of the sealing sheet 212, the inner diameter of the eighth step surface 221 is smaller than the diameter of the sealing sheet 212, the eighth step surface 221 and the sealing sheet 212 can be sealed and fitted, and the ninth step surface 22 The depth of the eighth step surface 221 is the same as the length of the piston body 213 in the AB direction. The inner diameter of the eighth step surface 221 is larger than the diameter of the piston body 213. The ninth step surface 222 is an annular surface. A third center hole 227 is provided in the ninth step surface 222. The side wall of the pump housing 22 is provided with side holes 225. There are four side holes 225. The B-side of the ninth step surface 222 is a driving cavity 228. The piezoelectric ceramic 23 is placed at the position of the driving cavity 228. The B-side end of the pump housing 22 is provided with a positioning groove 226. The positioning groove 226 is provided on the inner wall of the pump housing 22.

[0056] like Figure 7 and Fig.12 As shown, the piezoelectric ceramic 23 is a cylinder, and a protrusion 231 is provided at the A side end of the piezoelectric ceramic 23. The protrusion 231 is a cylinder, and the protrusion 231 is fixed to the body of the piezoelectric ceramic 23. The diameter of the protrusion 231 is equal to the inner diameter of the ninth step surface 222, and the protrusion 231 can be inserted into the third center hole 227 from the B side; a positioning notch 232 is provided at the B side end of the piezoelectric ceramic 23; the piezoelectric ceramic 23 is externally connected to alternating current, and the piezoelectric ceramic 23 will expand and contract in the AB direction after the alternating current is turned on.

[0057] like Fig.12 and Fig.13 As shown, the positioning member 24 is a circular ring, and four positioning buckles 241 are provided on the outer wall of the positioning member 24, and the positioning buckles 241 match the positioning groove 226. A positioning step 242 is provided on the inner wall of the positioning member 24, and the positioning step 242 matches the positioning notch 232. The positioning member 24 can be sleeved on the B side end of the piezoelectric ceramic 23, and the positioning member 24 and the piezoelectric ceramic 23 will not rotate; the positioning member 24 is sleeved on the B side end of the piezoelectric ceramic 23, and then the piezoelectric ceramic 23 is inserted into the driving cavity 228 of the pump housing 22 from the B side, and the positioning buckle 241 of the positioning member 24 can be inserted into the positioning groove 226 from the B side. At this time, the pump housing 22, the piezoelectric ceramic 23 and the positioning member 24 are fixedly connected, and the above three will not rotate relative to each other.

[0058] like Fig.12 As shown, a second internal thread 229 is provided on the inner wall of the B side end of the pump housing 22, and a second external thread 251 is provided on the outer wall of the A side end of the rear cover 25. The second internal thread 229 and the second external thread 251 match each other. The rear cover 25 is fixedly connected to the pump housing 22, and the piezoelectric ceramic 23 and the fixing part 24 are fixed inside the pump housing 22; then the piston 21 is inserted into the A end of the pump housing 22 from the A direction to form a piezoelectric drive device 2.

[0059] like Figure 1 As shown, the hydraulic circulation device 1 and the piezoelectric drive device 2 are fixedly connected to the first internal thread 223 via the first external thread 155 , and the sealing of the cavity where the piston 21 is located is ensured by the sealing ring of the second groove 154 .

[0060] The single-valve dual-chamber piezoelectric pump as described above has the following working method:

[0061] S1. Connect the external alternating current to the piezoelectric ceramic 23. When the piezoelectric ceramic 23 reaches the voltage amplitude, it will deform in the direction of A. The piston 21 outputs the displacement and pushes the fluid in the hydraulic circulation device 1 to flow into the outlet cavity 1518 through the 8 outlet channels 1515, and then outputs it to the outside in the form of flow rate and pressure.

[0062] S2. When the pressure value of the outlet chamber 1518 reaches the first preset value, the piezoelectric ceramic 23 contracts in the direction of B, driving the piston 21 to deform toward the B side, thereby reducing the pressure in the hydraulic circulation device 1. When the pressure drops to the second preset value, the one-way valve 16 opens, and under the action of the accumulator 11, the fluid enters the accumulator 11 from the inlet 111, flows to the one-way valve 16 through the inlet channel, and flows through the one-way valve 16 and the outlet channel 1515 into the outlet chamber 1518. When the pressure value of the outlet chamber 1518 reaches the third preset value, the process of increasing pressure in step S1 is repeated to realize sequential circulation.

[0063] Embodiment 2

[0064] The difference between this embodiment and the above-mentioned embodiment is that a foam plate or a spring is placed inside the accumulator partition 12 , so that the accumulator 11 has a stronger energy storage capacity for pressure and can better stabilize the stability of the pressure inside the accumulator 11 .

[0065] Embodiment 3

[0066] The difference between this embodiment and the above-mentioned embodiments is that the materials of the components such as the piston body 213, the piston plate 211, the one-way valve 16, the cavity 15, the accumulator 11, the accumulator partition 12, and the pump housing 22 are all made of stainless steel.

[0067] The above description is only a preferred embodiment of the present invention, which is only illustrative and not restrictive of the present invention. Those skilled in the art understand that many changes, modifications, and even equivalences may be made to the present invention within the spirit and scope defined by the claims of the present invention, but all of them will fall within the scope of protection of the present invention.

Claims

1. A single-valve dual-chamber piezoelectric pump, characterized in that: The invention comprises a hydraulic circulation device and a piezoelectric drive device, wherein the hydraulic circulation device comprises a one-way valve and a cavity, wherein an inlet cavity and an outlet cavity are arranged in the cavity, wherein the one-way valve is arranged between the inlet cavity and the outlet cavity, wherein the one-way valve realizes one-way flow of fluid from the inlet cavity to the outlet cavity, wherein the piezoelectric drive device is externally connected to an alternating current, wherein the piezoelectric drive device can adjust the pressure in the hydraulic circulation device, wherein the hydraulic circulation device is further provided with an accumulator, wherein the accumulator is a cylindrical container with a closed side end A and an open side end B, wherein a cavity is arranged in the accumulator, wherein an inlet is arranged on the side wall of the accumulator, wherein the fluid can flow into the cavity of the accumulator through the inlet, and wherein the inlet and the inlet are connected to each other. The flow cavity is connected, the accumulator is sealed and connected to the cavity, the cavity is provided with an outlet, the outlet is connected to the outflow cavity, the accumulator is also provided with an accumulator partition, the accumulator partition is located in the cavity of the accumulator, a first inlet hole is provided on the accumulator partition, the diameter of the accumulator partition is smaller than the diameter of the cavity of the accumulator, ensuring that an annular gap is left between the accumulator partition and the inner wall of the accumulator, and the fluid can pass through the first inlet hole and the annular gap, an outflow channel is provided between the outflow cavity and the one-way valve, an inflow channel is provided between the inflow cavity and the one-way valve, and the total cross-sectional area of ​​the outflow channel is smaller than the cross-sectional area of ​​the inflow channel.

2. The single-valve dual-chamber piezoelectric pump according to claim 1, characterized in that: The number of the one-way valve is 1.

3. The single-valve dual-chamber piezoelectric pump according to claim 1, characterized in that: An accumulator partition is arranged in the accumulator, and a spring / foam / nitrile rubber is arranged on the inner side of the accumulator partition.

4. The single-valve dual-chamber piezoelectric pump according to claim 1, characterized in that: The piezoelectric drive device comprises a piston, a pump housing, and a piezoelectric ceramic. The piezoelectric ceramic is built into the pump housing. One end of the piston is connected to the piezoelectric ceramic, and the other end of the piston is connected to the one-way valve.

5. The single-valve dual-chamber piezoelectric pump according to claim 4, characterized in that: The piezoelectric ceramic is a high-voltage packaged piezoelectric ceramic. The piezoelectric ceramic is externally connected to an alternating current. After being energized, the piezoelectric ceramic performs a telescopic movement and drives the piston to deform.

6. The single-valve dual-chamber piezoelectric pump according to claim 4, characterized in that: The piezoelectric drive device further comprises a fixing member, which is respectively fixedly connected to the piezoelectric ceramic and the pump housing, and plays a fixing role.

7. The single-valve dual-chamber piezoelectric pump according to any one of claims 1 to 6, characterized in that: The working method of the single-valve dual-chamber piezoelectric pump is: S1, turning on the external power supply of the piezoelectric drive device, the piezoelectric drive device increases the pressure in the outlet cavity, at which time the one-way valve is closed, and the fluid in the outlet cavity flows out of the outlet cavity; S2. When the pressure in the outlet chamber increases to a first preset value, the pressure driving device reduces the pressure in the outlet chamber. When the pressure in the outlet chamber decreases to a second preset value, the one-way valve opens, and the fluid flows from the inlet chamber into the outlet chamber. When the pressure value of the outlet chamber reaches a third preset value, the process of increasing pressure in step S1 is repeated to realize a cycle.

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