Electronic barometer

Abstract

The utility model discloses an electronic barometer, which relates to the technical field of barometer measurement, and comprises a barometer disc and a barometer base, the barometer disc comprises a circuit board, a pointer electrode and a bourdon tube, the circuit board is provided with an MCU microprocessor, a signal detection circuit and a plurality of PCB scale electrodes which are uniformly distributed at intervals in an arc shape, the signal detection circuit and the PCB scale electrodes are electrically connected with input and output ports (also called I / O ports) of the MCU microprocessor respectively, and the pointer electrode is electrically connected with the signal input end of the signal detection circuit through a Bourdon tube and a metal shell of the electronic barometer. The pointer electrode is fixed on the bourdon tube or linked with the bourdon tube; the pointer electrode and the bourdon tube are both made of conductive metal materials. The utility model provides a multifunctional electronic barometer which is simple in structure, low in cost and excellent in cost performance in the field of MPa-level high-pressure application.

Description

Technical Field

[0001] This utility model relates to the field of air pressure measurement technology, specifically, to an electronic air pressure gauge. Background Technology

[0002] Commonly used barometers are mainly classified into pointer-type barometers and electronic barometers. Pointer-type barometers are inexpensive but have simple functions, limiting their application in intelligent fields. Existing electronic barometers offer more expandable functions, but they are bulky and expensive. Especially for MPa (megapascal) level high-pressure barometers, the key component of existing electronic barometers is the semiconductor pressure sensor, which is very expensive. A semiconductor pressure sensor capable of measuring 30 MPa starts at over 60 yuan, and the total cost of the device is over 150 yuan.

[0003] like Figure 1 The illustrated Bourdon tube pointer-type barometer 1 (axial pointer-type barometer) works on the following principle: The shape change caused by the pressure variation inside the Bourdon tube (also known as a Bourdon tube) is converted into the deflection of the first pointer 12, which is displayed on the first dial 11. The Bourdon tube 13 at the center of the gauge head is hollow. The tube end at the center of the Bourdon tube 13 is connected to the gas inlet 16 via a connector 15 connected to the gauge housing 14. The tube end outside the circumference of the Bourdon tube is welded and sealed to prevent air leakage, and the first pointer 12 is also welded to it. The greater the gas pressure inside the hollow Bourdon tube, the greater the deformation of the Bourdon tube. The outward expansion of the Bourdon tube causes a greater deflection of the pointer welded to it, indicating a higher gas pressure.

[0004] like Figure 2 The illustrated bow-shaped Bourdon tube pointer-type barometer 2 (radial pointer-type barometer) has a hollow bow-shaped Bourdon tube 23. One end of the bow-shaped Bourdon tube is connected to the gas inlet and fixed to the base of the barometer. The other end of the bow-shaped Bourdon tube is welded and sealed to prevent air leakage, and a movable connecting rod 24 is also installed. The greater the gas pressure inside the hollow bow-shaped Bourdon tube 23, the greater the deformation of the bow-shaped Bourdon tube 23. This causes the connecting rod 24 to drive the second pointer 22 to deflect more, indicating a higher gas pressure, which is displayed on the second scale 21.

[0005] The disadvantages of the above two types of pointer-type barometers are that they have limited functions and require manual observation to check the air pressure, which cannot keep up with the development of intelligent applications in the information age.

[0006] like Figure 3The shown semiconductor electronic barometer 3 (diffusion silicon type pressure sensor barometer) works on the basis of semiconductor pressure sensing technology, and the core component is a semiconductor pressure sensor, which is composed of a low pressure cavity 31, a high pressure cavity 33, a silicon cup 32, a silicon diaphragm 37, a diffusion resistor 36, a first lead wire 34, a second lead wire 38 and the like. The gas enters the sensor from the second gas inlet 35, and the sensor converts the pressure received into an electrical signal, which is amplified, analog-digital converted, MCU processed and displayed in digital form through the circuit board 39. The disadvantage of this pressure gauge is high cost, especially in MPa (mega-pascal) high pressure field, the semiconductor pressure sensor technology is extremely difficult to realize, resulting in high price and cost index rising. Practical new type content

[0007] The utility model discloses an electronic barometer, which is used to solve the problems of single function of the pointer type barometer, inadaptability to intelligent application and high cost of the semiconductor electronic barometer in high pressure field in the prior art.

[0008] The utility model solves the above -mentioned problems through the following technical scheme:

[0009] An electronic barometer comprises a barometer dial and a barometer base, the barometer dial comprises a circuit board, a pointer electrode and a bourdon tube, the circuit board is provided with an MCU microprocessor, a signal detection circuit and a plurality of PCB scale electrodes which are evenly and spacedly arranged in an arc shape, the signal detection circuit and the plurality of PCB scale electrodes are electrically connected with the input and output ports of the MCU microprocessor respectively, the pointer electrode is electrically connected with the signal input end of the signal detection circuit through the bourdon tube and the metal shell of the electronic barometer, and the pointer electrode is fixed to the bourdon tube or linked with the bourdon tube.

[0010] Further, the fixing mode of the pointer electrode and the bourdon tube is welding.

[0011] Further, the pointer electrode is linked with the bourdon tube or a connecting rod mechanism connected with the bourdon tube.

[0012] Further, the pointer electrode and the PCB scale electrode are matched in shape.

[0013] Further, the height difference between the pointer electrode and the PCB scale electrode is 0.3mm-1mm.

[0014] Further, the signal detection circuit comprises a filtering unit and an amplifying unit, the filtering unit is used for receiving the signal of the pointer electrode and filtering and inputting the amplifying unit, and the amplifying unit is used for amplifying the input signal and inputting the input and output port (also referred to as I / 0 port) of the MCU microprocessor.

[0015] Further, one of the pointer electrode and the PCB scale electrode is a pulse signal transmitting port, and the other is a pulse signal receiving port.

[0016] Further, the MCU microprocessor is further electrically connected with one or more of a liquid crystal screen display module, a communication module, a temperature detection module, an alarm module and a safety automatic control module.

[0017] The air pressure measuring method realized by the electronic air pressure gauge comprises the following steps:

[0018] The MCU microprocessor sequentially outputs pulse signals from the first PCB scale electrode to each PCB scale electrode, or inversely outputs pulse signals from the last PCB scale electrode, or outputs pulse signals in a sequence capable of shortening the time for judging the position of the pointer (for example, from the middle PCB scale electrode).

[0019] The MCU microprocessor receives the pulse signal fed back by the pointer electrode, judges which PCB scale electrode the pointer electrode matches with according to the signal strength, and thus judges the position of the pointer electrode.

[0020] According to the full pressure and the number of the PCB scale electrodes of the electronic air pressure gauge, the current pressure value is calculated in combination with the position of the pointer electrode.

[0021] Further, the MCU microprocessor further judges the coupling signal strength between the pointer electrode and the plurality of PCB scale electrodes according to the pulse signal fed back by the pointer electrode, and obtains the position of the pointer electrode between two PCB scale electrodes.

[0022] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0023] (1) The utility model avoids the design idea of the existing electronic multifunctional air pressure gauge adopting a semiconductor pressure sensor, and designs a multifunctional electronic air pressure gauge with simple structure and low cost, which has very superior performance-price ratio in the application field of MPa high air pressure.

[0024] (2) The utility model discloses a low price, and the very mature traditional pointer type pressure gauge Bourdon tube linkage pointer deflection principle is utilized, and the scale dial of the original pointer air pressure gauge is replaced by the PCB scale electrode, and the pointer electrode of the original pointer air pressure gauge is replaced by the pointer electrode of the original pointer air pressure gauge. The relative position of the pointer on the scale dial is judged through the receiving and sending signal between the scale electrode and the pointer electrode, and the pressure size is calculated, and the digital form can be displayed.

[0025] (3) The utility model discloses based on MCU design, can extend information interaction communication, alarm, with pressure size to control relevant intelligent equipment, realizes the intelligent of the pressure monitoring application field and promotes security level;Dangerous pressure value threshold can also be set, and relevant equipment is automatically and timely controlled, and safety is improved.

[0026] (4) The reliability and stability of the pointer type air pressure gauge are good, the utility model discloses the Bourdon tube linkage pointer deflection principle to realize electronic air pressure gauge, and the stability and reliability are high, and compared with semiconductor pressure sensor, in high pressure and superhigh pressure occasion use, cost is low, and the cost performance is high. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is the schematic diagram of the spring-shaped Bourdon tube pointer type air pressure gauge in the prior art;Among them, (a) is the head schematic diagram of the spring-shaped Bourdon tube pointer type air pressure gauge, (b) is the bottom schematic diagram of the spring-shaped Bourdon tube pointer type air pressure gauge;

[0028] Figure 2 It is the schematic diagram of the bow-shaped Bourdon tube pointer type air pressure gauge in the prior art;Among them, (a) is the head schematic diagram of the bow-shaped Bourdon tube pointer type air pressure gauge, (b) is the bottom schematic diagram of the bow-shaped Bourdon tube pointer type air pressure gauge;

[0029] Figure 3 It is the schematic diagram of the semiconductor electronic air pressure gauge in the prior art;

[0030] Figure 4 It is the dial structure schematic diagram of the electronic air pressure gauge of the first specific implementation of the utility model;

[0031] Figure 5 It is the dial structure schematic diagram of the electronic air pressure gauge of the second specific implementation of the utility model;

[0032] Figure 6 It is the circuit principle schematic diagram of the relevant part of the electronic air pressure gauge of the utility model;

[0033] Figure 7 It is the working principle schematic diagram of the electronic air pressure gauge in the utility model;

[0034] Among them, 1-Spring-shaped Bourdon tube pointer barometer; 11-First dial; 12-First pointer; 13-Spring-shaped Bourdon tube; 14-Case; 15-Connector; 16-First air inlet; 2-Arch-shaped Bourdon tube pointer barometer; 21-Second dial; 22-Second pointer; 23-Arch-shaped Bourdon tube; 24-Connecting rod; 3-Semiconductor electronic barometer; 31-Low-pressure chamber; 32-Silicon cup; 33-High-pressure chamber; 34-First lead; 35-Second air inlet; 36-Diffusion resistor; 37-Silicon diaphragm; 38-Second lead; 39-Circuit board; 4-Barometer dial A; 41-Pointer electrode A; 42-PCB scale electrode A; 43-Bourdon tube A; 5-Barometer dial B; 51-PCB scale electrode B; 52-Pointer electrode B; IC1-MCU microprocessor; IC2-Operational amplifier. Detailed Implementation

[0035] The present invention will be further described in detail below with reference to the embodiments, but the implementation of the present invention is not limited thereto.

[0036] Example 1:

[0037] Combined with appendix Figure 4 As shown, an electronic barometer includes a barometer dial A4 and a barometer base. The barometer dial A4 includes a circuit board, pointer electrodes A41, and a Bourdon tube A43. The circuit board is equipped with an MCU microprocessor IC1, a signal detection circuit, and multiple PCB scale electrodes A42 evenly spaced in an arc shape. The signal detection circuit and the multiple PCB scale electrodes A42 are electrically connected to the input and output ports of the MCU microprocessor IC1, respectively. The pointer electrodes A41 are electrically connected to the signal input terminal of the signal detection circuit through the Bourdon tube A43 and the metal casing of the electronic barometer. The pointer electrodes A41 are optionally fixed to the Bourdon tube A43, and the fixing method between the pointer electrodes A41 and the Bourdon tube A43 is welding. Both the pointer electrodes A41 and the Bourdon tube A43 are made of conductive metal materials and can conduct electricity.

[0038] This invention improves upon the gauge head of the existing spring-type Bourdon tube pointer-type barometer, by modifying the gauge base and... Figure 1 Same as in (b). In this invention, the Bourdon tube is still hollow. The tube head at the center of the Bourdon tube is connected to the gas inlet. The tube head outside the circumference of the Bourdon tube is welded and sealed to prevent gas leakage, and a pointer electrode A41 is welded on at the same time. The greater the gas pressure inside the hollow Bourdon tube, the greater the deformation of the Bourdon tube. The outward expansion of the spring-shaped Bourdon tube causes the pointer welded to the Bourdon tube to deflect more, indicating a greater gas pressure.

[0039] Working principle:

[0040] The printed circuit board (PCB) is used to replace the scale disc of the pointer type barometer. A plurality of PCB conductive copper foil electrodes, namely PCB scale electrodes A42, are designed on the PCB and are insulated from each other. The PCB scale electrodes A42 are connected to different I / O (input / output pin) ports of the MCU. The pointer electrode A41 is designed as a pointer electrode A41 which is deflected in linkage with the deformation of the Bourdon tube with the size of the air pressure. The number of the PCB scale electrodes A42 is not necessarily a fixed value. According to the size of the barometer and the different expected measurement resolution, the number of the PCB scale electrodes A42 is adjusted. Figure 4 In the spring type Bourdon tube barometer, 15 scale electrodes are designed in the schematic diagram because the full deflection angle is small. Figure 5 In the arc type Bourdon tube barometer, 25 scale electrodes are designed in the schematic diagram because the full deflection angle is large. The pointer electrode A41 is deflected in proportion to the deformation of the Bourdon tube with the size of the air pressure and is above the PCB scale electrodes A42. The height difference between the PCB scale electrodes A42 and the pointer electrode A41 is preferably between 0.3-1 mm. In the production process, the two electrodes should not be in direct contact to avoid the friction force hindering the deflection of the pointer and affecting the measurement accuracy.

[0041] The PCB scale electrodes A42 are designed as pulse signal transmitting ports. The pointer electrode A41 is designed as a pulse signal receiving port. Alternatively, the PCB scale electrodes A42 are designed as receiving ports and the pointer electrode A41 is designed as a transmitting port. However, in this way, the receiving end signal amplification circuit is more complex. The working principle of the barometer is described by taking the PCB scale electrodes A42 as pulse signal transmitting ports and the pointer electrode A41 as a pulse signal receiving port. The pointer electrode A41 and the Bourdon tube A43 are both conductive metal materials, and the conductive path is connected to the input end of the signal detection circuit on the circuit board through the metal shell of the barometer.

[0042] The circuit schematic diagram of the utility model is shown in Figure 6 , Figure 6 Only the circuit schematic diagram of the part related to the utility model is shown. By electrically connecting the MCU microprocessor IC1 with one or more of the liquid crystal screen display module, the communication module, the temperature detection module, the alarm module and the safety automatic control module, the functions of the liquid crystal screen display, the communication, the temperature detection, the alarm and the safety automatic control can be realized, and different application occasions can be adapted.

[0043] Figure 6 In the utility model, the MCU microprocessor IC1 can be selected according to the different actual application occasions. In the schematic diagram, the number of the PCB scale electrodes A42 is 15, and a 20-pin MCU is selected. If the number of the PCB scale electrodes is 25 or more, a MCU with more pins is selected. Figure 6The middle signal detection circuit lists a filter circuit and an operational amplifier IC2 and related circuits, and refers to a schematic diagram of a filter amplification processing circuit of a pointer electrode end coupled to receive a signal, and different amplification processing circuits can be selected according to different application occasions. The selection of the above elements and the form of the circuit do not affect the description of the key technology of the utility model.

[0044] The main working principle of the circuit part of the utility model is shown in the schematic waveform as Figure 7 The PCB scale electrode A42 outputs a pulse group from P1 to P15 polling scanning. The waveform not drawn in the figure is omitted. The pointer electrode A41 is shown above P14 of the PCB scale electrode A42. Therefore, it can be seen from the waveform diagram that the receiving end of the pointer electrode A41 only has an inductive received amplified pulse output when the P14 output waveform of the PCB scale electrode A42. The MCU judges that the pointer of the barometer is at the P14 position and calculates the corresponding pressure size accordingly.

[0045] The pulse frequency of the pulse output of the PCB scale electrode is generally selected between 10KHz and 1MHz, which is called the working frequency. According to different sizes of barometer varieties and different areas of electrodes, the working frequency is adjusted by software, and the target is to make the receiving end of the pointer electrode get better signal waveform. The scale electrode is defined as a transmitting end, which can also be called a transmitting electrode. The pointer electrode is defined as a receiving end, which can also be called a receiving electrode. The two kinds of electrodes actually form a capacitor, which can also be called a coupler. The larger the area of each transmitting electrode and receiving electrode designed, the larger the equivalent capacitance capacity, and the lower the working frequency can be selected, and the filter and amplifier circuit is simpler. The smaller the area of each transmitting electrode and receiving electrode designed, the smaller the equivalent capacitance capacity, the stronger the coupling high-frequency capability, and the higher the working frequency needs to be selected, but the filter and amplifier circuit is relatively complex, and the cost will increase appropriately.

[0046] The key technology of the utility model is to use the MCU microprocessor (MCU for short) to drive multiple scale electrodes, to transmit pulse signals in turn in a scanning mode, to judge the accurate position of the current deflection of the pointer by receiving signals through the pointer electrode, to add the received signals after filtering and amplification to the MCU for analog-to-digital conversion (also called AD conversion), to calculate the air pressure size by the relative intensity of the signals received by the pointer electrode. Then the MCU drives the liquid crystal display screen to display the air pressure value in a digital manner, and can also transmit the air pressure value to other user terminal devices in a wired or wireless manner. Under-voltage and over-voltage automatic alarm or automatic safety protection action in emergency situations can also be realized.

[0047] The transmitting end and the receiving end can also be reversed, the MCU transmits a signal to the pointer electrode, and then detects which scale electrode receives the signal and the relative size of the signal in a scanning manner to determine the accurate position of the current deflection of the pointer.

[0048] Figure 4 The first specific embodiment of the utility model is shown, the pointer electrode A41 is above the PCB scale electrode A42, and the height difference is between 0.3 and 1 mm. The area overlap of the two electrodes is actually the principle of a capacitor. The capacitance size is related to the height difference and the area overlap of the two electrodes. In order to increase the overlap area of the pointer electrode and the PCB scale electrode, the shape of the pointer electrode and the PCB scale electrode is matched in the utility model. The capacitor has an AC signal coupling effect, so the pulse signal transmitted on the scale electrode is coupled to the pointer electrode through the capacitor formed between the two electrodes. It can also be understood that the scale electrode transmits a signal, and the pointer electrode above the scale electrode receives the signal. The signal coupled to the pointer electrode is amplified and filtered and then added to the MCU for AD conversion, and the relative signal size is measured.

[0049] The further working principle of the utility model is that the more the overlap area of the pointer electrode and the scale electrode below is, the stronger the signal coupled to the electrode is, and the larger the AD conversion value of the MCU is. For example: Figure 4 As shown in the figure, the pointer electrode is above the "P14" of the scale electrode, when the transmitting end pulse signal scans the "P14" of the scale electrode, the signal coupled to the pointer electrode is the strongest, the signals coupled to the pointer electrode when scanning the "P13" and "P15" of the left and right neighbor electrodes are very weak, and even zero, as shown in the waveform Figure 7 Then, the MCU can determine that the pointer electrode is above the scale electrode "P14" according to the measurement result. Figure 4 As shown in the figure, 15 electrodes are designed for full deflection, if the full deflection pressure represents 30 MPa (mega pascal), then Figure 4 As shown in the figure, the pointer electrode is at "P14", and the measurement result of the MCU is determined as 28 MPa (mega pascal). Other transmitting electrodes such as P1, P2,..., P13, P15 are far away from the receiving electrode or have no overlap relationship, so there is no coupling signal or the coupling signal is very small. For example: Figure 5 As shown in the figure, the pointer electrode is above the "P10" and "P11" of the scale electrode, when the transmitting end pulse signal scans the "P10" of the scale electrode, the signal coupled to the pointer electrode is relatively medium, and when the transmitting end pulse signal scans the "P11" of the scale electrode, the signal coupled to the pointer electrode is also relatively medium, then the MCU can determine that the pointer electrode is between the "P10" and "P11" scales according to the measurement result. Figure 5The full scale design is 25 scale electrodes, if the full scale pressure represents 50 MPa (mega pascal), then Figure 5 The pointer electrode is between "P10" and "P11" scales, and the measurement result is determined as 21 MPa (mega pascal). Other transmitting electrodes such as P1, P2...P9, P12...P25 are far away from or have no overlapping relationship with the pointer electrode, so there is no coupling signal or the coupling signal is very small. The relative size of the MCU measurement value can further determine whether the pointer electrode coincides more with "P10" or more with "P11", that is, to determine which scale electrode the pointer is closer to and which scale electrode the pointer is more coupled to, thereby further improving the pressure measurement resolution.

[0050] The further working principle of the utility model is that the height difference of the pointer electrode above the scale electrode is between 0.3-1mm, and the non-uniformity of the height difference will affect the capacitance capacity formed between the two electrodes, thereby affecting the strength of signal coupling. However, because the receiving end adopts the analog-digital conversion mode of MCU to convert the size of the analog signal received by coupling into the size of digital quantity. Therefore, by comparing the relative size of the digital quantity, the relative position of the pointer electrode above the scale electrode is determined. Therefore, it is not necessary to strictly require the height precision of the pointer electrode above the scale electrode and the height consistency in batch production.

[0051] In summary, the utility model uses the principle of the pointer type pressure gauge, and designs multiple scale electrodes on the printed circuit board to replace the scale disc of the pointer type pressure gauge. The scale electrodes are mutually insulated PCB conductive copper foils. The pointer designed as a pointer electrode is deflected in proportion to the pressure size in the linkage mode of the Bourdon tube by scanning polling the pulse signal output on each scale electrode. The pointer electrode receives the pulse signal transmitted by the scale electrode through the capacitive coupling effect between the pointer electrode and the scale electrode. Therefore, the relative position of the pointer on the scale disc is determined, and the MCU calculates the corresponding pressure size.

[0052] The number of scale electrodes in the utility model can be flexibly designed according to the specific product size, the selected specification parameters of the Bourdon tube, the maximum measurement range, the expected measurement accuracy and the like.

[0053] Embodiment 2:

[0054] Figure 5The second embodiment is shown, an electronic barometer, comprising a barometer dial B5 and a barometer base, the barometer dial B5 comprises a circuit board, a pointer electrode B52, the circuit board is provided with an MCU microprocessor IC1 (IC1 needs to be selected in this case MCU with more pins), a signal detection circuit and a plurality of arc-shaped and uniformly spaced PCB scale electrodes B51, the signal detection circuit and the plurality of PCB scale electrodes B51 are respectively electrically connected with the input and output ports of the MCU microprocessor IC1, the circuit board is provided with a scale plate matched with the PCB scale electrode B51, the pointer electrode B52 is connected with the bourdon tube through a connecting rod (the connection structure is the same as Figure 2 In the utility model, the pointer electrode B52, the connecting rod and the bourdon tube are all made of conductive metal materials.

[0055] The electronic barometer in the embodiment is a partial improvement on the arc-shaped bourdon tube pointer type barometer in the prior art, and the difference from the embodiment 1 is that one is a spring-shaped bourdon tube and the other is an arc-shaped bourdon tube. Similarly, the arc-shaped bourdon tube is hollow, the bourdon tube one end head is communicated with the gas inlet and is fixed on the barometer base, the bourdon tube other end head is welded to seal and prevent gas leakage, and the movable connecting rod is installed. The greater the gas pressure in the hollow of the bourdon tube, the greater the deformation of the bourdon tube, and the greater the deflection of the pointer driven by the connecting rod, indicating that the gas pressure is greater. The working principle is the same as that of the embodiment 1.

[0056] Embodiment 3

[0057] The barometric pressure measuring method realized by the electronic barometer in the embodiment 1 or the embodiment 2 comprises the following steps.

[0058] The MCU microprocessor sequentially outputs pulse signals from the first PCB scale electrode, or outputs pulse signals in reverse order from the last PCB scale electrode, or outputs pulse signals in an order that can shorten the time of judging the position of the pointer electrode;

[0059] The MCU microprocessor receives the pulse signals fed back by the pointer electrode, judges which PCB scale electrode the pointer electrode matches with according to the signal strength, and thus judges the position of the pointer electrode;

[0060] According to the full deflection pressure of the barometer and the number of PCB scale electrodes, the current pressure value is calculated combined with the position of the pointer electrode.

[0061] Further, the MCU microprocessor further judges the relative strength of the coupling signals between the pointer electrode and the plurality of PCB scale electrodes according to the pulse signals fed back by the pointer electrode, and obtains the position of the pointer electrode between two PCB scale electrodes.

[0062] Although the present application has been described with reference to the explanatory embodiments thereof, the above-described embodiments are merely the preferred embodiments of the present application, and the embodiments of the present application are not limited to the above-described embodiments, and it should be understood that those skilled in the art can design many other modifications and embodiments, and these modifications and embodiments will fall within the scope and spirit of the principles disclosed in the present application.

Claims

1. An electronic barometer comprising a barometer dial and a barometer base, characterized by, The barometer dial comprises a circuit board, a pointer electrode and a bourdon tube, the circuit board is provided with an MCU microprocessor, a signal detection circuit and a plurality of PCB scale electrodes which are evenly and spacedly arranged in an arc shape, the signal detection circuit and the plurality of PCB scale electrodes are electrically connected with input and output ports of the MCU microprocessor respectively, the pointer electrode is electrically connected with a signal input end of the signal detection circuit through the bourdon tube and a metal shell of the electronic barometer, and the pointer electrode is fixed to the bourdon tube or linked with the bourdon tube; the pointer electrode and the bourdon tube are made of conductive metal materials.

2. An electronic barometer according to claim 1, wherein The fixing mode of the pointer electrode and the bourdon tube is welding.

3. An electronic barometer according to claim 1, wherein The linkage of the pointer electrode and the bourdon tube is realized through a connecting rod which is connected with the pointer electrode and the bourdon tube at two ends respectively.

4. An electronic barometer according to claim 1, wherein The pointer electrode and the PCB scale electrode are matched in shape.

5. An electronic barometer according to claim 1, wherein The height difference between the pointer electrode and the PCB scale electrode is 0.3mm-1mm.

6. An electronic barometer according to claim 1, wherein The signal detection circuit comprises a filtering unit and an amplifying unit, the filtering unit is used for receiving signals of the pointer electrode, filtering the signals and inputting the signals to the amplifying unit, and the amplifying unit is used for amplifying input signals and inputting the amplified signals to the input and output ports of the MCU microprocessor.

7. An electronic barometer according to claim 1, wherein One of the pointer electrode and the PCB scale electrode is a pulse signal transmitting port, and the other is a pulse signal receiving port.

8. An electronic barometer according to claim 1, wherein The MCU microprocessor is further electrically connected with one or more of a liquid crystal screen display module, a communication module, a temperature detection module, an alarm module and a safety automatic control module.

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