Novel sulfur hexafluoride micro-pressure density controller
By using stepper motors and high-precision temperature-pressure integrated sensors in the sulfur hexafluoride micro-pressure density controller, combined with a microcontroller and a relay, the problems of low accuracy and unstable sealing of traditional density controllers are solved, and high-precision and stable density control is achieved.
Patent Information
- Application Number
- CN202421816047.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-30
- Publication Date
- 2025-06-17
- Estimated Expiration
- 2034-07-30
AI Technical Summary
The traditional sulfur hexafluoride micro-pressure density controller relies on mechanical movements, has low linear accuracy, is susceptible to altitude, is not tightly sealed, and cannot withstand high-frequency vibration and impact, resulting in poor accuracy and air leakage risks.
The stepper motor is used instead of the traditional mechanical movement, combined with a high-precision temperature and pressure integrated sensor, and the stepper motor is calculated and driven by a single chip computer to achieve high-precision indication, and the contact failure problem is solved through a relay.
It improves the accuracy and stability of the density controller, solves the problems of mechanical vibration and altitude influence, realizes high-precision and zero leakage density control, and enhances the intelligence level of the equipment.
Smart Images
Figure CN222995301U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of sulfur hexafluoride density controllers, and particularly relates to a novel sulfur hexafluoride micro-pressure density controller. Background Art
[0002] In the SF6 density controller industry, micro-pressure SF6 density controllers (hereinafter referred to as micro-pressure gauges) with a small size (Y60) and a range of 0 - 0.2 MPa are widely used in urban rail transit, high-speed railways, and intelligent community power grid systems. The traditional micro-pressure gauges basically follow the principle of pointer-type sulfur hexafluoride density controllers in the traditional high-pressure field.
[0003] With the vigorous development and construction of urban rail transit and high-speed railways, the demand for intelligent pure electronic density controllers is becoming more and more urgent. First, the traditional micro-pressure gauges still use bourdon tubes and mechanical movements, and their linear accuracy is very low. Second, altitude has a great impact on micro-pressure gauges. To ensure that they are not affected by altitude, the housing seals adopted cannot achieve zero leakage. In harsh environments and during long-term operation, the seals often fail, resulting in incorrect meter indications. Third, due to the limited range, the elastic element, the bourdon tube, is very thin and cannot withstand the impacts and high-frequency vibrations brought by multiple switchings of the switch cabinet.
[0004] In summary, it is necessary to develop a product that conforms to modern digital development and can solve the inherent problems of the above traditional micro-pressure gauges. Content of the Utility Model
[0005] In order to solve the above problems, the utility model provides a novel sulfur hexafluoride micro-pressure density controller with a simple structure, stable operation without jamming and shaking, high precision, and which solves the influence of mechanical vibration on the meter.
[0006] A novel sulfur hexafluoride micro-pressure density controller of the utility model includes a housing arranged on a chassis. A window is arranged at one end of the housing away from the chassis. A meter handle is arranged on the chassis. A dial plate facing the window is arranged inside the housing, and a pointer is arranged in a matching manner on the dial plate.
[0007] A second aviation socket for signal remote transmission output is further arranged on the chassis.
[0008] One end of the meter handle extending into the housing is welded with a high-precision temperature and pressure integrated sensor for collecting the pressure of the switch gas chamber and the ambient temperature. A detection channel is arranged inside the meter handle, and the detection channel is communicated with the high-precision temperature and pressure integrated sensor.
[0009] A remote transmission PCB board and a driving board are fixedly arranged inside the housing. A single-chip microcomputer is arranged on the remote transmission PCB board, and the remote transmission PCB board and the driving board are fixedly connected to each other through isolation columns.
[0010] A stepper motor is fixedly arranged on the driving board, and the output shaft of the stepper motor passes through the center of the dial and is fixedly connected to one end of the pointer;
[0011] The high-precision temperature and pressure integrated sensor is electrically connected to the remote transmission PCB board, and the remote transmission PCB board is connected to the second aviation socket through a remote transmission output cable;
[0012] The remote transmission PCB board and the driving board are electrically connected through pin headers and female headers. A driving chip is arranged on the driving board, and the driving chip is electrically connected to the stepper motor.
[0013] Preferably, a first aviation socket connected to the secondary circuit of the switch and used to control the on / off of the secondary circuit of the switch is further arranged on the chassis;
[0014] A contact function PCB board is fixedly arranged in the area between the high-precision temperature and pressure integrated sensor and the remote transmission PCB board. The contact function PCB board is mechanically connected to the chassis and the remote transmission PCB board respectively through isolation columns, and the contact function PCB board and the remote transmission PCB board are electrically connected through a flexible cable;
[0015] A relay is arranged on the contact function PCB board, and the single-chip microcomputer on the remote transmission PCB board is connected to the first aviation socket through the relay and the contact output cable.
[0016] Preferably, a plurality of surface mount LEDs are arranged on the driving board at the position corresponding to the dial, and the surface mount LEDs are electrically connected to the driving board;
[0017] A film with a code disk scale line and numbers in a hollow and transparent shape is pasted on the dial, and the pointer is a light guide pointer.
[0018] Preferably, the driving chip is VT6608.
[0019] The utility model uses a stepper motor to replace the movement. The high-precision temperature and pressure integrated sensor collects the pressure and temperature of the insulating gas, calculates through the single-chip microcomputer and drives the stepper motor to drive the pointer to achieve high-precision indication. Since the pointer is driven by the stepper motor, the influence of mechanical vibration on the meter is solved, and the problems of high precision, stable operation without jamming and jitter are solved. The high-precision temperature and pressure integrated sensor is used to replace the traditional elastic element for measurement, and there is no need to seal the meter case, which solves the influence of altitude on the meter and realizes the high precision of the instrument.
[0020] In the utility model, the relay solves the common contact faults of the magnetic-assisted electric contact points and also solves the problem that the movement of multiple groups of electric contact points cannot drive and affects the indication accuracy. Brief Description of the Drawings
[0021] Figure 1 It is a schematic structural diagram of the utility model.
[0022] Figure 2This is a schematic diagram of the drive board.
[0023] Reference numerals: 601 - watch crown, 602 - chassis, 603 - high-precision integrated temperature and pressure sensor, 604 - housing, 605 - contact function PCB board, 606 - relay, 607 - isolation post, 608 - remote transmission PCB board, 609 - drive board, 610 - pointer, 611 - dial, 612 - window, 613 - front cover, 614 - stepper motor, 615 - remote transmission output cable, 616 - contact output cable, 617 - second aviation socket, 618 - drive chip, 619 - surface-mounted LED, 614-1 - motor output shaft, 614-2 - motor pin. Detailed implementation manners
[0024] A novel sulfur hexafluoride micro-pressure density controller of the present utility model includes a housing arranged on a chassis, a window is arranged at one end of the housing away from the chassis, a watch crown is arranged on the chassis, a dial facing the window is arranged inside the housing, and a pointer is arranged on the dial in a matching manner;
[0025] A second aviation socket for signal remote transmission output is further arranged on the chassis;
[0026] One end of the watch crown extending into the housing is welded with a high-precision integrated temperature and pressure sensor for collecting the pressure of the switch gas chamber and the ambient temperature, a detection channel is arranged inside the watch crown, and the detection channel is communicated with the high-precision integrated temperature and pressure sensor;
[0027] A remote transmission PCB board and a drive board are fixedly arranged inside the housing, a single-chip microcomputer is arranged on the remote transmission PCB board, and the remote transmission PCB board and the drive board are fixedly connected by isolation posts;
[0028] A stepper motor is fixedly arranged on the drive board, and an output shaft of the stepper motor passes through the center of the dial and is fixedly connected with one end of the pointer;
[0029] The high-precision integrated temperature and pressure sensor is electrically connected with the remote transmission PCB board, and the remote transmission PCB board is connected with the second aviation socket through a remote transmission output cable;
[0030] The remote transmission PCB board and the drive board are electrically connected through pin headers and female headers, a drive chip is arranged on the drive board, and the drive chip is electrically connected with the stepper motor.
[0031] A first aviation socket connected to the secondary circuit of the switch and used for controlling the on-off of the secondary circuit of the switch is further arranged on the chassis;
[0032] A contact function PCB board is fixedly arranged in the area between the high-precision temperature and pressure integrated sensor and the remote transmission PCB board. The contact function PCB board is mechanically connected to the chassis and the remote transmission PCB board respectively through isolation columns, and the contact function PCB board and the remote transmission PCB board are electrically connected through a wire harness;
[0033] A relay is arranged on the contact function PCB board. The single-chip microcomputer on the remote transmission PCB board is connected to the first aviation socket through the relay and the contact output cable. The remote transmission PCB board controls the action of the relay on the contact function PCB board through the threshold value set in the single-chip microcomputer program.
[0034] A number of patch LEDs are arranged on the driving board at the position corresponding to the dial, and the patch LEDs are electrically connected to the driving board;
[0035] A film with a code disk scale line and numbers in a hollow and transparent shape is pasted on the dial, and the pointer is a light guide pointer.
[0036] The driving chip is VT6608. The relay adopts an Omron G6D-1A power relay.
[0037] The working process of the utility model is that the pressure and temperature values collected by the sensor are transmitted to the single-chip microcomputer system on the remote transmission PCB board. After calculating the density value at 20 °C, the density value is converted into the number of steps of the stepping motor, and the electrical signal of the number of steps is transmitted to the driving chip to control the action of the stepping motor to form a pointer indication. At the same time, the pressure, temperature values and the calculated density value collected on the remote transmission PCB board are output through RS485 remotely through the second aviation socket via the internal remote transmission cable. On the other hand, the cable of the switch secondary circuit is connected to the relay on the contact function board through the first aviation socket and the internal cable. The relay is normally open. A density alarm threshold is set in the single-chip microcomputer program. When the density value calculated by the single-chip microcomputer at 20 °C reaches and is lower than the threshold, an instruction is sent to the contact function board, and the contact function board controls the relay to change from the normally open state to the normally closed state, connecting the switch secondary circuit and triggering the alarm device of the switch itself.
[0038] The utility model solves the problems of poor accuracy, high air leakage hidden danger and poor shock resistance of the traditional micro-pressure density meter using a Bourdon tube as an elastic element, and at the same time adds a digital remote transmission function, improving the overall intelligent level of the equipment.
[0039] The utility model consists of a shell and a front cover. The appearance size and the watch handle interface are the same as those of the traditional mechanical meter, which is convenient for users to directly upgrade and switch. A high-precision temperature and pressure integrated sensor is welded inside the watch handle. The sensor collects the pressure of the switch gas chamber and the ambient temperature and transmits it to the single-chip microcomputer on the remote transmission PCB board. Through the operation of the single-chip microcomputer, the P converted to 20 °C is calculated 20The pressure value is obtained, and the number of steps of the stepper motor is calculated according to the 270° code disk. The number of steps of the stepper motor is transmitted to the driver board. The four motor pins of the stepper motor are soldered on the driver board. The driver chip is selected as VT6608, so that the output shaft of the stepper motor drives the pointer riveted on it to rotate according to the corresponding number of steps. 20 On the one hand, the remote transmission PCB board transmits P 20 , the current pressure value and temperature value to the background through the 485 serial port via the remote transmission output cable and the second aviation socket. On the other hand, the cable of the switch secondary circuit is connected to the relay on the contact function PCB board via the first aviation socket and the contact output cable. The relay is normally open. The density alarm threshold is set in the single-chip microcomputer program. When the density value at 20°C calculated by the single-chip microcomputer reaches and is lower than the threshold, an instruction is sent to the contact function PCB board, and the contact function PCB board controls the relay to change from the normally open state to the normally closed state, turning on the switch secondary circuit and triggering the alarm device of the switch itself.
[0040] In order to enable clear and accurate reading, multiple patch LEDs are evenly distributed on the driver board corresponding to the 270° code disk position. The dial is pasted with a film, and the code disk scale lines and numbers are made into hollow and transparent treatments. The pointer is preferably a light guide pointer, and the indication value of the meter can be visually read from a farther distance.
[0041] The remote transmission PCB board sets the required alarm / locking threshold through the burned program. When the threshold is reached, it controls the on / off of the relay on the contact function PCB board to turn on the secondary circuit of the switch, realizing the alarm function of the meter.
[0042] This utility model uses a stepper motor instead of a movement. The high-precision temperature and pressure integrated sensor collects the pressure and temperature of the insulating gas. Through the calculation of the single-chip microcomputer and driving the stepper motor to drive the pointer to achieve high-precision indication. Since the pointer is driven by the stepper motor, the influence of mechanical vibration on the meter is solved, with high precision, stable operation without jamming and jitter. Using a high-precision temperature and pressure integrated sensor instead of traditional elastic elements for measurement, there is no need to seal the meter case, solving the influence of altitude on the meter, and achieving high precision of the instrument.
[0043] The relay in this utility model solves the common contact faults of the magnetic-assisted electric contacts, and also solves the problem that the movement of multiple groups of electric contact movements cannot drive and affects the indication accuracy.
Claims
1. A novel sulfur hexafluoride micro-pressure density controller, comprising a housing arranged on a chassis, a window arranged on one end of the housing away from the chassis, a handle arranged on the chassis, a dial arranged in the housing facing the window, and a pointer arranged on the dial; The chassis is also provided with a second aviation socket for remote signal transmission; Features: A high-precision temperature and pressure integrated sensor for collecting the pressure of the switch air chamber and the ambient temperature is welded inside one end of the handle extending into the housing, and a detection channel is provided inside the handle, and the detection channel is connected to the high-precision temperature and pressure integrated sensor; A remote transmission PCB board and a driver board are fixedly arranged in the housing, a single-chip microcomputer is arranged on the remote transmission PCB board, and the remote transmission PCB board and the driver board are fixedly connected via an isolation column; A stepper motor is fixedly arranged on the driving plate, and an output shaft on the stepper motor passes through the center of the dial and is fixedly connected to one end of the pointer; The high-precision integrated temperature and pressure sensor is electrically connected to the remote transmission PCB board, and the remote transmission PCB board is connected to the second aviation socket through the remote transmission output cable; The remote transmission PCB board is electrically connected to the driving board through a pin header and a female header. A driving chip is arranged on the driving board, and the driving chip is electrically connected to the stepping motor.
2. A novel sulfur hexafluoride micro-pressure density controller as claimed in claim 1, characterized in that: The chassis is also provided with a first aviation socket connected to the secondary circuit of the switch and used for controlling the on and off of the secondary circuit of the switch; A contact point function PCB board is fixedly arranged in the area between the high-precision temperature and pressure integrated sensor and the remote transmission PCB board. The contact point function PCB board is mechanically connected to the chassis and the remote transmission PCB board through isolation columns, and the contact point function PCB board is electrically connected to the remote transmission PCB board through a flat cable. The contact function PCB board is provided with a relay, and the single chip microcomputer on the remote transmission PCB board is connected to the first aviation socket through the relay and the contact output cable.
3. A novel sulfur hexafluoride micro-pressure density controller as claimed in claim 2, characterized in that: A plurality of SMD LEDs are arranged at positions on the driving board corresponding to the dial, and the SMD LEDs are electrically connected to the driving board; The dial is pasted with a hollow transparent film with code disc lines and numbers, and the pointer is a light-guiding pointer.
4. A novel sulfur hexafluoride micro-pressure density controller as claimed in claim 3, characterized in that: The driver chip is VT6608.