阅读说明：本技术 一种pvdf膜的电荷注入装置及其注入方法 (Charge injection device and injection method of PVDF (polyvinylidene fluoride) film ) 是由 庄展提 于 2021-09-03 设计创作，主要内容包括：本发明涉及一种PVDF膜的电荷注入装置,包括绝缘底座、金属底板、至少两个第一绝缘柱、至少两个第二绝缘柱、中网安装框、中压控制网、高压连接器、高压放电框、中压连接器、公共连接端、高压发生器,金属底板固定安装于所述绝缘底座上,至少两个第一绝缘柱固定安装于金属底板上,中网安装框套设于所述第一绝缘柱上,中压控制网安装于中网安装框上,至少两个第二绝缘柱通过绝缘板安装于至少两个第一绝缘柱上,高压连接器安装于第二绝缘柱上,高压放电框安装于所述高压连接器上,中压连接器安装于中网安装框的一端,通过中压控制网的设置,经过中压控制网,此刻高压电场在这个中压控制网的平面上均匀分布,然后对PVDF膜进行均匀放电。(The invention relates to a charge injection device of a PVDF film, which comprises an insulating base, a metal base plate, at least two first insulating columns, at least two second insulating columns, a middle net mounting frame, a middle voltage control net, a high voltage connector, a high voltage discharge frame, a middle voltage connector, a public connecting end and a high voltage generator, wherein the metal base plate is fixedly arranged on the insulating base, the at least two first insulating columns are fixedly arranged on the metal base plate, the middle net mounting frame is sleeved on the first insulating columns, the middle voltage control net is arranged on the middle net mounting frame, the at least two second insulating columns are arranged on the at least two first insulating columns through insulating plates, the high voltage connector is arranged on the second insulating columns, the high voltage discharge frame is arranged on the high voltage connector, the middle voltage connector is arranged at one end of the middle net mounting frame, and passes through the middle voltage control net through the arrangement of the middle voltage control net, and at the moment, a high voltage electric field is uniformly distributed on the plane of the middle voltage control net, the PVDF film was then uniformly discharged.)

1. A charge injection device of a PVDF film is characterized by comprising an insulating base, a metal base plate, at least two first insulating columns, at least two second insulating columns, a middle net mounting frame, a middle voltage control net, a high voltage connector, a high voltage discharge frame, a middle voltage connector, a public connecting end and a high voltage generator, wherein the metal base plate is fixedly mounted on the insulating base, the at least two first insulating columns are fixedly mounted on the metal base plate, the middle net mounting frame is sleeved on the first insulating columns, the middle voltage control net is mounted on the middle net mounting frame, the at least two second insulating columns are mounted on the at least two first insulating columns through insulating plates, the high voltage connector is mounted on the second insulating columns, the high voltage discharge frame is mounted on the high voltage connector, the middle voltage connector is mounted at one end of the middle net mounting frame, the common connecting end is installed at one end of the metal bottom plate, and two ends of the high-voltage generator are respectively installed on the high-voltage connector and the medium-voltage connector.

2. The PVDF film charge injection device as defined in claim 1, further comprising a medium voltage controller, wherein the medium voltage controller is mounted on the medium voltage connector and the common connection terminal.

3. The PVDF film charge injection device as defined in claim 1, wherein the PVDF film charge injection device further comprises a high-precision voltage regulator, and the signal output terminal of the high-precision voltage regulator is connected to the signal input terminal of the high-voltage generator and the signal input terminal of the medium-voltage controller, respectively.

4. The PVDF film charge injection device as defined in claim 1, wherein the high-voltage discharge frame is made by winding a molybdenum wire.

5. The PVDF film charge injection device of claim 1, wherein the medium voltage control mesh is a stainless steel mesh.

6. The PVDF film charge injection device as defined in claim 1, wherein the insulating base is made of a resin material having high insulating property.

7. A method for injecting a charge injection device of a PVDF film,

s1, placing the PVDF film on a metal bottom plate;

s2, transmitting the commercial power to a medium-voltage generator and a high-voltage generator;

s3, the high voltage generator raises the voltage to a negative high voltage of a preset voltage value;

s4, applying negative high voltage to the high-voltage discharge frame;

s5, carrying out voltage equalization by a medium-voltage control network, and then uniformly discharging to the surface of the PVDF membrane;

s6, the PVDF film becomes a charged body by charge injection.

8. The method for injecting a charge injection device into a PVDF membrane as defined in claim 7, wherein a medium voltage controller is used to apply a tunable medium voltage to the medium voltage control network before S5.

9. The PVDF film charge injection method as defined in claim 7, wherein in S2, the commercial power is stabilized by a high-precision regulator before being sent to the medium-voltage generator and the high-voltage generator.

Technical Field

The invention relates to the technical field of charge injection of PVDF (polyvinylidene fluoride) films, in particular to a charge injection device of a PVDF film and an injection method thereof.

Background

The PVDF film is a novel piezoelectric material, when the PVDF film is stressed (pressure, vibration and distortion), a voltage is generated, and the PVDF film can be made into various sensors by utilizing the characteristic, so the PVDF film has wide scientific and technological applications, but the PVDF film has to be subjected to charge injection when in use so as to be a charged body to exert the piezoelectric characteristic of the PVDF film.

However, in the conventional charge injection device, the charge injection to the PVDF film in the electric field is usually accomplished by discharging the high voltage directly to the bottom plate to form a corona electric field, but such direct discharge has the disadvantages: the uniformity of the electric field produced by corona discharge is poor, with the electric field being stronger in the area perpendicular to the discharge electrode and weaker away from the high voltage discharge, thus the uniformity of charge injection into the PVDF film is poor.

Disclosure of Invention

In view of the above, it is necessary to provide a charge injection device for PVDF film and an injection method thereof, aiming at the problem of uniformity of charge injection of PVDF film.

A charge injection device of a PVDF film comprises an insulating base, a metal base plate, at least two first insulating columns, at least two second insulating columns, a middle net mounting frame, a middle voltage control net, a high voltage connector, a high voltage discharging frame, a middle voltage connector, a public connecting end and a high voltage generator, wherein the metal base plate is fixedly mounted on the insulating base, the at least two first insulating columns are fixedly mounted on the metal base plate, the middle net mounting frame is sleeved on the first insulating columns, the middle voltage control net is mounted on the middle net mounting frame, the at least two second insulating columns are mounted on the at least two first insulating columns through insulating plates, the high voltage connector is mounted on the second insulating columns, the high voltage discharging frame is mounted on the high voltage connector, the middle voltage connector is mounted at one end of the middle net mounting frame, and the public connecting end is mounted at one end of the metal base plate, two ends of the high-voltage generator are respectively arranged on the high-voltage connector and the medium-voltage connector.

In one embodiment, the charge injection device of the PVDF film further includes a medium voltage controller, and both ends of the medium voltage controller are respectively mounted on the medium voltage connector and the common connection terminal.

In one embodiment, the charge injection device of the PVDF film further includes a high-precision voltage stabilizer, and a signal output terminal of the high-precision voltage stabilizer is connected to signal input terminals of the high-voltage generator and the medium-voltage controller, respectively.

In one embodiment, the high-voltage discharge frame is formed by winding a molybdenum wire.

In one embodiment, the medium pressure control mesh is a stainless steel mesh.

In one embodiment, the insulating base is made of a high-insulating resin material.

A method for injecting a charge injection device of a PVDF film,

s1, placing the PVDF film on a metal bottom plate;

s2, transmitting the commercial power to a medium-voltage generator and a high-voltage generator;

s3, the high voltage generator raises the voltage to a negative high voltage of a preset voltage value;

s4, applying negative high voltage to the high-voltage discharge frame;

s5, carrying out voltage equalization by a medium-voltage control network, and then uniformly discharging to the surface of the PVDF membrane;

s6, the PVDF film becomes a charged body by charge injection.

In one embodiment, an adjustable medium voltage is applied to the medium voltage control network by the medium voltage controller before S5.

In one embodiment, in S2, before the commercial power is transmitted to the medium-voltage generator and the high-voltage generator, the commercial power is stabilized by a high-precision voltage stabilizer.

The charge injection device of the PVDF film and the injection method thereof have the beneficial effects that: through the setting of medium voltage control net, when rectangle high voltage discharge frame carries out corona discharge to metal substrate, at first through the medium voltage control net, high-voltage electric field evenly distributed on this medium voltage control net's plane at this moment, then evenly discharges to the PVDF membrane, makes its electrified effect better, ensures the stability of product.

Drawings

FIG. 1 is a schematic structural diagram of a charge injection device for PVDF film according to an embodiment of the present invention;

FIG. 2 is a schematic circuit diagram of a charge injection device of the PVDF film of FIG. 1 according to an embodiment of the present invention;

FIG. 3 is a circuit diagram of a high voltage generator of the charge injection device of the PVDF film of FIG. 1 according to the embodiment of the invention;

FIG. 4 is a circuit diagram of a medium voltage generator of the charge injection device of the PVDF film of FIG. 1 according to the embodiment of the invention;

FIG. 5 is a circuit diagram of a high precision voltage regulator of the charge injection device of PVDF film in FIG. 1 according to one embodiment of the present invention.

As shown in the drawings, the insulation base 100, the metal base plate 200, at least two first insulation posts 300, at least two second insulation posts 400, a middle net installation frame 500, a middle voltage control net 600, a high voltage connector 700, a high voltage discharge frame 800, a middle voltage connector 900, a common connection terminal 1000, a high voltage generator 2000, and a middle voltage controller 3000.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly connected" to another element, there are no intervening elements present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

As shown in fig. 1 and 2, a charge injection device of PVDF film includes an insulating base 100, a metal base plate 200, at least two first insulating columns 300, at least two second insulating columns 400, a middle net mounting frame 500, a middle voltage control net 600, a high voltage connector 700, a high voltage discharge frame 800, a middle voltage connector 900, a common connection end 1000, and a high voltage generator 2000, wherein the metal base plate 200 is fixedly mounted on the insulating base 100, the at least two first insulating columns 300 are fixedly mounted on the metal base plate 200, the middle net mounting frame 500 is sleeved on the first insulating columns 300, the middle voltage control net 600 is mounted on the middle net mounting frame 500, the at least two second insulating columns 400 are mounted on the at least two first insulating columns 300 through insulating plates, the high voltage connector 700 is mounted on the second insulating columns 400, the high voltage discharge frame 800 is mounted on the high voltage connector 700, the medium voltage connector 900 is installed at one end of the middle net installation frame 500, the common connection end 1000 is installed at one end of the metal base plate 200, and two ends of the high voltage generator 700 are respectively installed on the high voltage connector 700 and the medium voltage connector 900.

In one embodiment, the charge injection device of PVDF film further includes a medium voltage controller 3000, and both ends of the medium voltage controller 3000 are respectively mounted on the medium voltage connector 900 and the common connection terminal 1000.

In one embodiment, the charge injection device of the PVDF film further includes a high-precision voltage regulator 4000, and signal output terminals of the high-precision voltage regulator 4000 are respectively connected to signal input terminals of the high-voltage generator 2000 and the medium-voltage controller 3000.

In one embodiment, the high voltage discharge frame 800 is made by winding molybdenum wires.

In one embodiment, the medium voltage control mesh 600 is a stainless steel mesh.

In one embodiment, the insulating base 100 is made of a resin material with high insulating property.

A method for injecting a charge injection device of a PVDF film,

s1, placing the PVDF film on the metal base plate 200;

s2, transmitting the commercial power to the high voltage generator 2000;

s3, the high voltage generator 2000 raises the voltage to a negative high voltage of a preset voltage value;

s4, applying a negative high voltage to the high voltage discharging frame 800;

s5, carrying out uniform discharge to the surface of the PVDF membrane after voltage equalization by a medium-voltage control network 600;

s6, the PVDF film becomes a charged body by charge injection.

In one embodiment, an adjustable medium voltage is applied to the medium voltage control network 600 by the medium voltage controller 3000 before S5.

In one embodiment, in S2, before the commercial power is transmitted to the medium voltage generator 3000 and the high voltage generator 2000, the commercial power is stabilized by the high precision voltage stabilizer 4000.

High-voltage discharge frame 800: the high-voltage discharge frame 800 is formed by winding high-temperature and high-voltage resistant molybdenum wires and is fixed on the four second insulating columns 400 to form a rectangular discharge frame; when high voltage enters, the PVDF film on the metal bottom plate 200 is corona-discharged through the medium-voltage control network 600, so that charge injection is realized.

Medium voltage control network 600: the stainless steel net is fixed on a stainless steel frame, namely the frame of the middle net mounting frame 500, by a 60-65 mesh stainless steel net.

Metal base plate 200: the metal base plate 200 forms a main loop of high voltage discharge, and the PVDF film injected with charges is also placed on the metal base plate 200, and when the metal base plate 200 is discharged by high voltage, the charge injection of the PVDF film is realized by the corona electric field of the discharge.

Insulating base 100: the insulating base 100 mainly insulates the high-voltage device from the ground and the work table with high strength, and is made of a resin material with high insulation.

When the PVDF film needs to be subjected to charge injection, the PVDF film is placed on the metal bottom plate 200;

transmitting the commercial power to the high voltage generator 2000; the high voltage generator 2000 boosts the voltage to a negative high voltage of a preset voltage value; applying a negative high voltage to the high voltage discharge frame 800; when the high-voltage discharge frame 800 performs corona discharge on the metal base plate 200, voltage is uniformly discharged to the surface of the PVDF film after being equalized by the medium-voltage control net 600; the PVDF film becomes a charged body by charge injection.

As shown in fig. 3, the high voltage generator 2000, a b is a stable ac power supply from 220V, the power supply is boosted to 30000V by a high voltage step-up transformer, and the current is limited by a resistor R1 and then transmitted to the high voltage discharge box 800 to realize high voltage discharge, and the capacitor C1 and the capacitor C2 are both peak hold capacitors.

Thus, a charge injection device of PVDF film and injection method thereof: through the setting of medium voltage control net 600, when rectangle high voltage discharge frame 800 carries out corona discharge to metal soleplate 200, at first through medium voltage control net 600, high voltage electric field evenly distributed on this medium voltage control net 600's plane at this moment, then evenly discharges to the PVDF membrane, makes its electrified effect better, ensures the stability of product.

Further, as shown in fig. 4, in order to avoid the attenuation of the high voltage, the charge injection device of PVDF film further includes a medium voltage controller 3000, and both ends of the medium voltage controller 3000 are respectively mounted on the medium voltage connector 900 and the common connection terminal 1000.

The introduction of the medium voltage control network 600 improves the uniformity of the medium voltage discharge, but attenuates the high voltage, and the medium voltage control network 600 is connected with an adjustable medium voltage, which plays a role in relaying and accelerating the high voltage discharge. The adjustable voltage of 0-1 kV generated by the medium voltage controller 3000 plays a role in increasing or decreasing a high-voltage electric field, so that the control of high-voltage discharge intensity is realized.

a. The b terminal is a stable alternating current power supply from 220V, the power supply raises 220V to 1000V through a medium voltage boosting transformer, the current is limited through a resistor R2 and then is transmitted to the medium voltage control network 600 to realize medium voltage control, capacitors C3 and C4 are both peak holding capacitors, it needs to be specially stated that the medium voltage is not a fixed value, but is adjusted according to the requirement of PVDF film charge injection potential, different medium voltage can be obtained by adjusting the medium voltage boosting transformer, and different high voltage discharge electric fields are realized by the different medium voltage.

As shown in fig. 5, in order to ensure the stability of the power supply voltage, the charge injection device of the PVDF film further includes a high-precision voltage regulator 4000, and signal output terminals of the high-precision voltage regulator 4000 are connected to signal input terminals of the high-voltage generator 2000 and the medium-voltage controller 3000, respectively.

The precise voltage stabilizer consists of an input alternating current detection part, a comparison coding part, a bidirectional thyristor starting control circuit and the like, and the working principle is as follows: the voltage on an isolation winding L of the autotransformer T1 is rectified by VD 1-VD 4, one path of the voltage is subjected to current limiting by R1, voltage stabilization by IC1, filtering by C1 and output of 12V direct-current voltage, and a voltage stabilizing circuit consisting of R2 and VD5 provides reference voltage for an IC2 comparator; and the other path is subjected to smoothing and anti-interference processing by R3, C2 and C3, and then is used for providing sampling voltage for four comparators IC2-1, IC2-2, IC2-3 and IC2-4 of IC2 through RP 1-RP 4. When the voltage of the alternating current power supply changes, the comparators from IC2-1 to IC2-4 quantize the alternating current power supply, and then control signals are output through the encoder. Each section of input voltage range corresponds to a coding result, and the working states of bidirectional thyristors VS1, VS2 and VS3 are controlled through a positive jump delay circuit consisting of R5-R7, C4-C6 and VD 6-VD 8 and single-pole single-throw electronic switches IC5-1, IC5-2 and IC5-3 of IC5, so that the functions of automatic alternating current voltage regulation and precise voltage regulation are realized, and the voltage output by commercial power is more stable.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.