CN214911727U - Wheel type piezoelectric precision infusion pump with alarm function - Google Patents
Wheel type piezoelectric precision infusion pump with alarm function Download PDFInfo
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- CN214911727U CN214911727U CN202120430086.7U CN202120430086U CN214911727U CN 214911727 U CN214911727 U CN 214911727U CN 202120430086 U CN202120430086 U CN 202120430086U CN 214911727 U CN214911727 U CN 214911727U
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Abstract
The utility model discloses a take alarming function's wheeled piezoelectricity precision infusion pump, which comprises a housin, a substrate, the seal membrane, the entry check valve, export check valve and alarm system, wherein the base plate, the seal membrane, entry check valve and export check valve are all integrated in the inner chamber of casing, the base plate assembly is on the upper portion of casing inner chamber, be provided with resistance strain gauge and piezoelectric wafer on the base plate, resistance strain gauge is connected with alarm system, alarm system carries out work according to the transmission data of resistance strain gauge, the seal membrane is established in the lower part of base plate, be provided with the spliced pole between seal membrane and the base plate, beneficial effect: the liquid medicine pump has the advantages that no dead angle volume causes pollution to the liquid medicine after the liquid medicine is pumped out, and meanwhile, no dead angle volume causes pollution to the liquid medicine after the liquid medicine is pumped out. The outlet one-way valve and the wheel type stop valve are overlapped to prevent the backflow of the medicine and meet the required functions at the same time. The utility model discloses be equipped with sensing circuit, measuring circuit and warning circuit and make the transfer pump block up effect that the feedback was warned occasionally.
Description
Technical Field
The utility model relates to a piezoelectricity precision infusion pump, in particular to wheeled piezoelectricity precision infusion pump of taking alarming function.
Background
In recent years, with the rapid development of mems technology, the microfluidic control system, which is an important branch of the mems technology, is favored because of its high control precision, small size, and low power consumption. The micropump is an important component constituting a fluid control system, and can precisely control the flow rate of the liquid.
Compared with micropumps in other driving modes, the piezoelectric micropump has the advantages of simple structure, small volume, light weight, low noise, no electromagnetic interference, capability of controlling output flow by applying different voltages and frequencies and the like, and has wide application prospects in the fields of drug delivery, synthesis, micro-fluid synthesis and precise control.
At present, a piezoelectric infusion micropump does not need to be additionally provided with a driving motor, but utilizes the inverse voltage effect of piezoelectric ceramics to deform a piezoelectric vibrator so as to drive the volume of a pump cavity to generate periodic change to realize fluid output. The prior piezoelectric infusion micropump generally has the following problems:
1. the initial net volume is large, and the piezoelectric micropump is difficult to self-suck;
2. the valve plate is easy to fatigue and wear, and particles in liquid are possibly adsorbed on the valve plate, so that a system is blocked;
3. the height of the pump cavity of the micro pump is high, and the dead space volume can pollute the liquid when the liquid is pumped.
Disclosure of Invention
The utility model aims at providing a wheel type piezoelectric precision infusion pump with an alarm function for solving the problems of the existing piezoelectric infusion micropump which generally exist in the using process.
The utility model provides a wheeled piezoelectricity precision infusion pump of area alarming function includes the casing, a substrate, the seal membrane, the entry check valve, export check valve and alarm system, wherein the substrate, the seal membrane, entry check valve and export check valve are all integrated in the inner chamber of casing, the substrate assembly is in the upper portion of casing inner chamber, be provided with resistance strain gauge and piezoelectric wafer on the substrate, resistance strain gauge is connected with alarm system, alarm system carries out work according to the transmission data of resistance strain gauge, the seal membrane is established in the lower part of substrate, be provided with the spliced pole between seal membrane and the substrate, entry check valve and export check valve establish in proper order in the bottom of seal membrane, be provided with entry valve and first through-hole on the entry check valve, be provided with outlet valve and second through-hole on the export check valve, the second through-hole corresponds the setting of entry valve, first through-hole corresponds the setting of inlet valve, the shell is internally provided with a transfusion channel, the second through hole and the inlet valve are communicated with the inlet of the transfusion channel, and the first through hole and the outlet valve are communicated with the outlet of the transfusion channel.
The base plate is spoke formula metal substrate, and the resistance strain gauge of assembly on the base plate is provided with two, and two resistance strain gauges correspond to paste on the top surface of base plate, and the piezoelectric wafer of assembly on the base plate is provided with four, and four piezoelectric wafers are two double-phase relative respectively to paste on the top surface and the bottom surface of base plate, and the assembly axis of resistance strain gauge is mutually perpendicular with the assembly axis of piezoelectric wafer.
The bottom surface of the sealing membrane and the top surface of the inlet one-way valve plate are packaged together in a tight fit mode, when the sealing membrane warps upwards along with the base plate, a channel is formed between the bottom surface of the sealing membrane and the top surface of the inlet one-way valve plate, and the channel is communicated with a transfusion channel in the shell.
The alarm system is connected with a power supply and provides electric energy by the power supply, the alarm system consists of a sensor, a controller and an interaction mechanism, wherein the sensor is formed by connecting an outgoing line on a resistance strain gauge on a substrate with an amplifying circuit and an analog-digital converter, the controller is a circuit board integrated with a microcontroller and a micro-control circuit, the sensor is connected with the circuit board, the micro-control circuit in the controller comprises a key circuit, a display circuit and a buzzer circuit, the interaction mechanism comprises keys, an OLED display screen and a buzzer, wherein the OLED display screen can display a real-time strain value, the keys are used for setting an alarm threshold value, the buzzer sends out an alarm when the measured strain value is higher than the threshold value, otherwise, the alarm cannot be given out, the resistance strain gauge on the substrate forms a strain bridge, and when the substrate deforms under the action of a piezoelectric wafer, the resistance strain gauge generates corresponding strain, the resistance strain gauge utilizes the change that the bridge circuit obtained corresponding voltage, analog voltage signal passes through analog-to-digital converter and converts the digital quantity of high accuracy into and transmit microcontroller, accomplish the processing to this digital quantity by microcontroller, again through the display circuit, thereby drive the display part and accomplish information exchange, obtain the measured strain value on the OLED display screen, if the strain value that is measured exceeds the maximum value that the piezoelectric vibrator that sets up is met an emergency, bee calling organ can send out warning signal, the signal of control piezoelectric vibrator is asymmetric square wave signal, in a cycle, when voltage amplitude is great positive value, liquid is slowly pumped into in the casing, when voltage amplitude is less negative value, help accelerating the speed that the seal membrane kick-backs, pump out the liquid medicine.
The connecting column arranged between the sealing film and the substrate is a flexible connecting column which can deform along with the deformation of the substrate.
The inlet valve arranged on the inlet one-way valve and the outlet valve arranged on the outlet one-way valve are both cantilever beam type one-way valves, the bottom of the outlet one-way valve is also provided with a wheel type stop valve, and the wheel type stop valve is arranged corresponding to the outlet of the transfusion channel.
The resistance strain gauge, the piezoelectric wafer and the alarm system are all assembled by existing equipment, and therefore specific models and specifications are not described in detail.
The working principle of the utility model is as follows:
the utility model provides a take alarming function's wheeled piezoelectricity precision infusion pump makes the piezoelectricity oscillator take place the displacement under reverse piezoelectricity effect's effect through applying the external electric field for the piezoelectricity oscillator to along with alternating voltage's effect, the piezoelectricity oscillator produces periodic displacement, realizes the one-way flow of the interior fluid of pump chamber.
When a positive voltage with a large external electric field acts on two ends of the piezoelectric material, the piezoelectric wafer deforms, so that the piezoelectric vibrator bends upwards and deforms, the flexible connecting column is driven to displace upwards, and a channel is formed between the sealing film and the inlet one-way valve to form a pump cavity. Meanwhile, the inlet valve on the inlet one-way valve is opened, the outlet valve on the outlet one-way valve is closed, and the liquid medicine is pumped in.
When the smaller negative voltage of external electric field acts on the two ends of the piezoelectric material, the piezoelectric wafer begins to restore deformation, the flexible connecting column is driven to displace downwards, and the channel between the sealing membrane and the inlet one-way valve is reduced. Meanwhile, an inlet valve on the inlet one-way valve is closed, an outlet valve on the outlet one-way valve and the wheel type stop valve are opened, and the liquid medicine is pumped out. When the liquid medicine is completely pumped out, the piezoelectric vibrator and the sealing film both recover deformation.
When the outlet of the piezoelectric infusion pump is blocked, the liquid medicine in the infusion pump cannot be smoothly pumped out, and the piezoelectric vibrator and the sealing film cannot recover deformation. Then, the external electric field signal enters the next period, namely the external electric field changes from negative voltage to positive voltage, and the infusion pump pumps the liquid medicine again. When the cycle of pumping the liquid medicine is finished, the deformation amount of the piezoelectric vibrator and the sealing film is increased again because the liquid medicine in the previous cycle is not completely discharged. The variable of the resistance strain sheet adhered on the spoke type piezoelectric vibrator is increased and exceeds the maximum value of the deformation of the piezoelectric vibrator. Therefore, when the outlet one-way valve of the piezoelectric infusion pump is blocked, but the piezoelectric infusion pump still pumps liquid continuously, the alarm system can play a role in warning.
The utility model has the advantages that:
the utility model provides a take alarming function's wheeled piezoelectricity precision infusion pump is under initial condition, and the seal membrane encapsulates with the mode of entry check valve in order tightly laminating. The wheel type piezoelectric precise infusion pump has no initial pump cavity height, no dead space volume after the liquid medicine is pumped out causes pollution to the liquid medicine, and no dead space volume causes pollution to the liquid medicine after the liquid medicine is pumped out. The outlet one-way valve and the wheel type stop valve are overlapped to prevent the backflow of the medicine and meet the required functions at the same time. The utility model discloses be equipped with sensing circuit, measuring circuit and warning circuit and make the transfer pump block up effect that the feedback was warned occasionally.
Drawings
Fig. 1 is the overall structure schematic diagram of the infusion pump of the present invention.
Fig. 2 is the utility model discloses an infusion pump exploded structure schematic diagram.
Fig. 3 is a schematic diagram of the infusion pump medicine feeding process of the present invention.
Fig. 4 is the principle and schematic diagram of the drug discharging process of the infusion pump of the present invention.
Fig. 5 is a structural block diagram of the alarm system of the present invention.
The labels in the above figures are as follows:
1. casing 2, base plate 3, sealing film 4, inlet check valve 5, outlet check valve
6. Alarm system 7, resistance strain gauge 8, piezoelectric chip 9, spliced pole
10. An inlet valve 11, a first through hole 12, an outlet valve 13, a second through hole
14. Infusion channel 15, wheel type stop valve 16, power supply 17, sensor 18 and controller
19. Interaction mechanism 20, amplification circuit 21, analog-digital converter 22, microcontroller
23. Button circuit 24, display circuit 25, buzzer circuit 26, button
27. An OLED display 28, a buzzer.
Detailed Description
Please refer to fig. 1 to 5:
the utility model provides a wheeled piezoelectricity precision infusion pump with alarm function, which comprises a shell 1, a substrate 2, a sealing film 3, an inlet check valve 4, an outlet check valve 5 and an alarm system 6, wherein the substrate 2, the sealing film 3, the inlet check valve 4 and the outlet check valve 5 are all integrated in the inner cavity of the shell 1, the substrate 2 is assembled on the upper part of the inner cavity of the shell 1, a resistance strain gauge 7 and a piezoelectric wafer 8 are arranged on the substrate 2, the resistance strain gauge 7 is connected with the alarm system 6, the alarm system 6 works according to the transmission data of the resistance strain gauge 7, the sealing film 3 is arranged on the lower part of the substrate 2, a connecting column 9 is arranged between the sealing film 3 and the substrate 2, the inlet check valve 4 and the outlet check valve 5 are sequentially arranged at the bottom of the sealing film 3, an inlet valve 10 and a first through hole 11 are arranged on the inlet check valve 4, an outlet valve 12 and a second through hole 13 are arranged on the outlet check valve 5, the second through hole 13 is arranged corresponding to the inlet valve 10, the first through hole 11 is arranged corresponding to the outlet valve 12, the transfusion channel 14 is arranged in the shell 1, the second through hole 13 and the inlet valve 10 are communicated with the inlet of the transfusion channel 14, and the first through hole 11 and the outlet valve 12 are communicated with the outlet of the transfusion channel 14.
The base plate 2 is spoke formula metal substrate, and the resistance strain gauge 7 of assembly is provided with two on the base plate 2, and two resistance strain gauges 7 correspond to paste on the top surface of base plate 2, and the piezoceramics piece 8 of assembly on the base plate 2 is provided with four, and four piezoceramics pieces 8 are two liang relative respectively to paste on the top surface and the bottom surface of base plate 2, and the assembly axis of resistance strain gauge 7 is mutually perpendicular with piezoceramics piece 8's assembly axis.
The bottom surface of the sealing membrane 3 and the top surface of the inlet one-way valve 4 are sealed together in a close fit mode, and when the sealing membrane 3 warps upwards along with the base plate 2, a channel is formed between the bottom surface of the sealing membrane 3 and the top surface of the inlet one-way valve 4 and is communicated with a transfusion channel 14 in the shell 1.
The alarm system 6 is connected with a power supply 16, the alarm system 6 is powered by the power supply 16, the alarm system 6 is composed of a sensor 17, a controller 18 and an interaction mechanism 19, wherein the sensor 17 is formed by connecting an outgoing line on a resistance strain gauge 7 on a substrate 2 with an amplifying circuit 20 and an analog-digital converter 21, the controller 18 is a circuit board integrated with a microcontroller 22 and a micro-control circuit, the sensor 17 is connected with the circuit board, the micro-control circuit in the controller 18 comprises a key circuit 23, a display circuit 24 and a buzzer circuit 25, the interaction mechanism 19 comprises a key 26, an OLED display screen 27 and a buzzer 28, wherein the OLED display screen 27 can display a real-time strain value, the key 26 is used for setting an alarm threshold value, the measured strain value is higher than the threshold value, the buzzer 28 gives an alarm, otherwise, the alarm is not given, the resistance strain gauge 7 on the substrate 2 constitutes a strain bridge, when the substrate 2 is deformed under the action of the piezoelectric wafer 8, the resistance strain gauge 7 generates corresponding strain, the resistance strain gauge 7 obtains the change of corresponding voltage by using a bridge circuit, an analog voltage signal is converted into a high-precision digital quantity through an analog-digital converter 21 and is transmitted to a microcontroller 22, the microcontroller 22 finishes processing the digital quantity and then passes through a display circuit 24, so that a display part is driven to finish information exchange, a measured strain value is obtained on an OLED display 27 screen, if the measured strain value exceeds the set maximum value of the piezoelectric strain vibrator, a buzzer 28 sends out a warning signal, the buzzer sends out a warning signal, the signal for controlling the piezoelectric vibrator is an asymmetric square wave signal, when the voltage amplitude is a large positive value in one period, liquid is slowly pumped into the shell 1, and when the voltage amplitude is a small negative value, the speed of rebounding of the sealing film 3 is accelerated, the liquid medicine is pumped out.
The connecting column 9 arranged between the sealing film 3 and the substrate 2 is a flexible connecting column which can deform along with the deformation of the substrate 2.
The inlet valve 10 arranged on the inlet one-way valve 4 and the outlet valve 12 arranged on the outlet one-way valve 5 are cantilever beam type one-way valves, the bottom of the outlet one-way valve 5 is also provided with a wheel type stop valve 15, and the wheel type stop valve 15 is arranged corresponding to the outlet of the transfusion channel 14.
The resistance strain gauge 7, the piezoelectric wafer 8 and the alarm system 6 are all assembled in the existing equipment, and therefore, the specific model and specification are not described in detail.
The working principle of the utility model is as follows:
the utility model provides a take alarming function's wheeled piezoelectricity precision infusion pump makes the piezoelectricity oscillator take place the displacement under reverse piezoelectricity effect's effect through applying the external electric field for the piezoelectricity oscillator to along with alternating voltage's effect, the piezoelectricity oscillator produces periodic displacement, realizes the one-way flow of the interior fluid of pump chamber.
When a positive voltage with a large external electric field acts on two ends of the piezoelectric material, the piezoelectric wafer 8 deforms, so that the piezoelectric vibrator bends upwards to deform, the flexible connecting column 9 is driven to displace upwards, and a channel is formed between the sealing membrane 3 and the inlet one-way valve 4 to form a pump cavity. Meanwhile, the inlet valve 10 on the inlet check valve 4 is opened, the outlet valve 12 on the outlet check valve 5 is closed, and the liquid medicine is pumped in.
When a smaller negative voltage of an external electric field acts on two ends of the piezoelectric material, the piezoelectric wafer 8 starts to restore deformation and drives the flexible connecting column 9 to displace downwards, so that a channel between the sealing membrane 3 and the inlet one-way valve 4 is reduced. Meanwhile, the inlet valve 10 on the inlet one-way valve 4 is closed, the outlet valve 12 on the outlet one-way valve 5 and the wheel type stop valve 15 are opened, and the liquid medicine is pumped out. When the liquid medicine is completely pumped out, the piezoelectric vibrator and the sealing film 3 are deformed again.
When the outlet of the piezoelectric infusion pump is blocked, the liquid medicine in the infusion pump cannot be smoothly pumped out, and the piezoelectric vibrator and the sealing film 3 cannot recover deformation. Then, the external electric field signal enters the next period, namely the external electric field changes from negative voltage to positive voltage, and the infusion pump pumps the liquid medicine again. When the cycle of pumping the liquid medicine is finished, the deformation amount of the piezoelectric vibrator and the sealing film 3 is increased again because the liquid medicine of the previous cycle is not completely discharged. The deformation amount of the resistance strain gauge 7 adhered to the spoke type piezoelectric vibrator increases and exceeds the maximum value of the deformation amount of the piezoelectric vibrator. Therefore, when the outlet check valve 5 of the piezoelectric infusion pump is blocked, but the piezoelectric infusion pump continues to pump liquid, the alarm system 6 can play a role in warning.
Claims (6)
1. The utility model provides a take alarming function's wheeled piezoelectricity precision infusion pump which characterized in that: the alarm device comprises a shell, a substrate, a sealing film, an inlet one-way valve, an outlet one-way valve and an alarm system, wherein the substrate, the sealing film, the inlet one-way valve and the outlet one-way valve are integrated in an inner cavity of the shell, the substrate is assembled at the upper part of the inner cavity of the shell, a resistance strain gauge and a piezoelectric wafer are arranged on the substrate, the resistance strain gauge is connected with the alarm system, the alarm system works according to transmission data of the resistance strain gauge, the sealing film is arranged at the lower part of the substrate, a connecting column is arranged between the sealing film and the substrate, the inlet one-way valve and the outlet one-way valve are sequentially arranged at the bottom of the sealing film, an inlet valve and a first through hole are arranged on the inlet one-way valve, an outlet valve and a second through hole are arranged on the outlet one-way valve, the second through hole is arranged corresponding to the inlet valve, the first through hole is arranged corresponding to the outlet valve, an infusion channel is arranged in the shell, and the second through hole and the inlet valve are communicated with the infusion channel, the first through hole and the outlet valve are communicated with the outlet of the transfusion channel.
2. The wheeled piezoelectric precision infusion pump with the alarm function according to claim 1, characterized in that: the base plate be spoke formula metal substrate, the resistance strain gauge of assembly on the base plate be provided with two, two resistance strain gauges correspond to paste on the top surface of base plate, the piezoelectric wafer of assembly on the base plate is provided with four, four piezoelectric wafer two liang are relative respectively to paste on the top surface and the bottom surface of base plate, the assembly axis of resistance strain gauge is mutually perpendicular with the assembly axis of piezoelectric wafer.
3. The wheeled piezoelectric precision infusion pump with the alarm function according to claim 1, characterized in that: the bottom surface of the sealing membrane and the top surface of the inlet one-way valve are packaged together in a tight fit mode, when the sealing membrane warps upwards along with the substrate, a channel is formed between the bottom surface of the sealing membrane and the top surface of the inlet one-way valve, and the channel is communicated with a transfusion channel in the shell.
4. The wheeled piezoelectric precision infusion pump with the alarm function according to claim 1, characterized in that: the alarm system is connected with a power supply and provides electric energy by the power supply, and consists of a sensor, a controller and an interaction mechanism, wherein the sensor is formed by connecting an outgoing line on a resistance strain gauge on a substrate with an amplifying circuit and an analog-digital converter, the controller is a circuit board integrated with a microcontroller and a micro-control circuit, the sensor is connected with the circuit board, the micro-control circuit in the controller comprises a key circuit, a display circuit and a buzzer circuit, the interaction mechanism comprises keys, an OLED display screen and a buzzer, wherein the OLED display screen can display a real-time strain value, the keys are used for setting an alarm threshold value, the measured strain value is higher than the threshold value buzzer to give an alarm, otherwise, the alarm cannot be given, the resistance strain gauge on the substrate forms a strain bridge, and when the substrate deforms under the action of the piezoelectric wafer, the resistance strain gauge generates corresponding strain, the resistance strain gauge utilizes the bridge circuit to obtain the change of corresponding voltage, analog voltage signal is converted into high-precision digital quantity through an analog-digital converter and is transmitted to a microcontroller, the microcontroller finishes the processing of the digital quantity and then passes through a display circuit, thereby driving a display part to finish information exchange, obtaining the measured strain value on an OLED display screen, if the measured strain value exceeds the maximum strain value of the set piezoelectric vibrator, a buzzer can send out a warning signal, and the signal of controlling the piezoelectric vibrator is an asymmetric square wave signal.
5. The wheeled piezoelectric precision infusion pump with the alarm function according to claim 1, characterized in that: the connecting column arranged between the sealing film and the substrate is a flexible connecting column which can deform along with the deformation of the substrate.
6. The wheeled piezoelectric precision infusion pump with the alarm function according to claim 1, characterized in that: the inlet valve arranged on the inlet one-way valve and the outlet valve arranged on the outlet one-way valve are both cantilever beam type one-way valves, the bottom of the outlet one-way valve is also provided with a wheel type stop valve, and the wheel type stop valve is arranged corresponding to the outlet of the transfusion channel.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120430086.7U CN214911727U (en) | 2021-02-28 | 2021-02-28 | Wheel type piezoelectric precision infusion pump with alarm function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120430086.7U CN214911727U (en) | 2021-02-28 | 2021-02-28 | Wheel type piezoelectric precision infusion pump with alarm function |
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| CN214911727U true CN214911727U (en) | 2021-11-30 |
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| CN202120430086.7U Active CN214911727U (en) | 2021-02-28 | 2021-02-28 | Wheel type piezoelectric precision infusion pump with alarm function |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112843381A (en) * | 2021-02-28 | 2021-05-28 | 吉林大学 | Wheel type piezoelectric precision infusion pump with alarm function |
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2021
- 2021-02-28 CN CN202120430086.7U patent/CN214911727U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112843381A (en) * | 2021-02-28 | 2021-05-28 | 吉林大学 | Wheel type piezoelectric precision infusion pump with alarm function |
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