Direct type pressure measuring device

Abstract

The utility model discloses a direct type pressure measuring device, which comprises a sensing unit, a transmitting unit, a signal acquisition unit and a power supply unit, the sensing unit comprises a sensor and an insulating sleeve, the sensor comprises a sensing end, the insulating sleeve is sleeved on the sensing end, the sensing end is arranged in a through hole of a switch cabinet, and the sensor is used for outputting analog voltage signals; the transmitting unit is used for converting the analog voltage signal into a standard voltage signal; a waveform acquisition module of the signal acquisition unit is used for performing data display on the standard voltage signal; the power supply unit comprises a power supply used for providing working voltage for the transmitting unit and the sensor. According to the direct type pressure measuring device, through cooperation of the insulation sleeve piece and the isolation module, direct type pressure measurement is achieved, the problems of measurement time delay and pressure loss are avoided, and meanwhile the pressure measuring device can be effectively prevented from being damaged and measurement signals can be effectively prevented from being interfered.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure measurement, in particular to a direct pressure measurement device. Background Art

[0002] When a switchgear experiences short-circuit breaking or internal arc fault, the breaking arc or fault arc will release huge energy, and high-temperature and high-pressure air waves will be generated inside the cabinet, impacting the cabinet door, which may cause the shell to burst and threaten the safety of equipment and operators. Therefore, it is necessary to conduct breaking tests and arcing tests on the switchgear. When the switchgear has a short-circuit breaking or internal arc fault, a pressure measurement device is used to measure the pressure when the air wave impacts the cabinet door inside the cabinet, providing reference data for the cabinet design.

[0003] Most of the existing pressure measurement methods inside the switchgear cabinet are indirect or direct. For example, Chinese Patent CN 109470402A and Chinese Patent CN111380644A both belong to the indirect type. An external buffer chamber or sealed chamber is connected to the switchgear, and the pressure measurement device is connected to the buffer chamber or sealed chamber for measurement. However, such an indirect pressure measurement method has measurement delay and pressure loss, and cannot measure the air wave impact pressure on the switchgear cabinet body in a timely and accurate manner.

[0004] For the existing direct pressure sensors or pressure measurement devices, such as Chinese Patent CN206862552U and Chinese Patent CN117073892A, the insulation problem between the switchgear and the measurement device, as well as the isolation problem of the power supply and measurement signal, are not considered. During the test, the switchgear cabinet body will be charged, with a voltage as high as several thousand volts or even dozens of thousands of volts. The high voltage will conduct along the measurement line, easily causing damage to the pressure measurement device and the power supply and waveform acquisition device connected to it. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a direct pressure measurement device, which realizes direct pressure measurement through the cooperation of an insulation kit and an isolation module to avoid the problems of measurement delay and pressure loss, and can effectively avoid damage to the pressure measurement device and interference to the measurement signal.

[0006] To achieve the above purpose, the utility model discloses a direct pressure measurement device, which comprises:

[0007] A sensing unit, the sensing unit includes a sensor and an insulation kit. The sensor includes a sensing end, the insulation kit is sleeved on the sensing end, the sensing end is arranged in a through hole of the switchgear cabinet, and the sensor is used to output an analog voltage signal according to the pressure magnitude sensed by the sensing end;

[0008] A transmitter unit, the transmitter unit is connected to the sensor, and the transmitter unit is used to convert the analog voltage signal into a standard voltage signal;

[0009] A signal acquisition unit, the signal acquisition unit includes a waveform acquisition module and a first isolation module, the input end of the first isolation module is connected to the output end of the transmission unit, the first isolation module is used to output a voltage signal with the same amplitude and phase as its input end through its output end, the output end of the first isolation module is connected to the input end of the waveform acquisition module, and the waveform acquisition module is used to display data of the standard voltage signal;

[0010] A power supply unit, the power supply unit includes a power supply and a second isolation module, the output end of the power supply is connected to the input end of the second isolation module, the output end of the second isolation module is connected to the input end of the transmitter unit, the second isolation module is used to isolate the high voltage output by the transmitter unit, and the power supply is used to provide working voltage to the transmitter unit and the sensor.

[0011] Optionally, the insulating kit is T-shaped and includes a nut portion and a hollow sleeve portion, the outer wall and the inner wall of the sleeve portion are both provided with threads, the sleeve portion is inserted into the through hole of the switch cabinet, and the nut portion is fitted against the inner wall of the switch cabinet.

[0012] Optionally, the insulation kit is made of resin material.

[0013] Optionally, the direct pressure measurement device also includes a shielded cable, wherein two ends of the shielded cable are respectively connected to the transmission unit and the sensor, the transmission unit provides a working voltage to the sensor through the shielded cable, and the sensor sends an analog voltage signal to the transmission unit through the shielded cable.

[0014] Optionally, the waveform acquisition module includes an oscilloscope and a low-pass filtering module, the input end of the low-pass filtering module is connected to the output end of the first isolation module, the low-pass filtering module is used to filter out high-frequency interference signals output by the sensing unit, the transmitting unit and the first isolation module, the output end of the low-pass filtering module is connected to the input end of the oscilloscope, and the oscilloscope is used to convert the standard voltage signal into a waveform signal and display it.

[0015] Optionally, the power supply is a battery, and the battery is used to output a DC21.5V-26.5V voltage to the second isolation module, and the second isolation module is used to stabilize the voltage output by the battery to output a DC24V working voltage to the transmission unit.

[0016] The utility model realizes direct pressure measurement by arranging an insulating kit and an isolation module to cooperate with a sensor and a transmitter unit. The power supply provides working voltage to the sensor and the transmitter unit through the second isolation module. The sensing end of the sensor is sleeved with the insulating kit and is arranged in the through hole of the switch cabinet, so that the sensor can output an analog voltage signal according to the pressure sensed by the sensing end. The transmitter unit is responsible for converting the analog voltage signal into a standard voltage signal. The waveform acquisition module receives the standard voltage signal output by the transmitter unit through the first isolation module and displays the data to facilitate reading the voltage signal data. The direct pressure measurement of the above-mentioned sensor can avoid the problems of measurement delay and pressure loss. At the same time, the insulating kit is used to achieve insulation isolation between the sensor and the switch cabinet, and the first isolation module and the second isolation module are used to isolate the waveform acquisition module and the power supply from the transmitter unit, which can effectively avoid damage to the pressure measurement device and interference with the measurement signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic block diagram of a direct pressure measurement device according to an embodiment of the utility model.

[0018] Figure 2 This is a circuit structure diagram of a direct pressure measurement device according to an embodiment of the utility model. DETAILED DESCRIPTION

[0019] In order to explain the technical content, structural features, achieved objectives and effects of the present invention in detail, the following is a detailed description in conjunction with the implementation modes and the accompanying drawings.

[0020] See also Figure 1 and Figure 2 The utility model discloses a direct pressure measuring device, which comprises:

[0021] The sensing unit 1 includes a sensor 11 and an insulating kit 12. The sensor 11 includes a sensing end 111. The insulating kit 12 is sleeved on the sensing end 111. The sensing end 111 is disposed in a through hole 101 of the switch cabinet 100. The sensor 11 is used to output an analog voltage signal according to the pressure sensed by the sensing end 111.

[0022] Transmitting unit 2, the transmitting unit 2 is connected to the sensor 11, and the transmitting unit 2 is used to convert the analog voltage signal into a standard voltage signal;

[0023] The signal acquisition unit 3 includes a waveform acquisition module 31 and a first isolation module 32. The input end of the first isolation module 32 is connected to the output end of the transmission unit 2. The first isolation module 32 is used to output a voltage signal with the same amplitude and phase as its input end through its output end. The output end of the first isolation module 32 is connected to the input end of the waveform acquisition module 31. The waveform acquisition module 31 is used to display the standard voltage signal data;

[0024] The power supply unit 4 includes a power supply 41 and a second isolation module 42. The output end of the power supply 41 is connected to the input end of the second isolation module 42. The output end of the second isolation module 42 is connected to the input end of the transmitter unit 2. The second isolation module 42 is used to isolate the high voltage output by the transmitter unit 2. The power supply 41 is used to provide working voltage to the transmitter unit 2 and the sensor 11.

[0025] The utility model realizes direct pressure measurement by setting an insulating kit 12 and an isolation module to cooperate with the sensor 11 and the transmitter unit 2. The power supply 41 provides working voltage to the sensor 11 and the transmitter unit 2 through the second isolation module 42. The sensing end 111 of the sensor 11 is sleeved with the insulating kit 12 and is set in the through hole 101 of the switch cabinet 100, so that the sensor 11 can output an analog voltage signal according to the pressure sensed by the sensing end 111. The transmitter unit 2 is responsible for converting the analog voltage signal into a standard voltage signal. The waveform acquisition module 31 receives the standard voltage signal output by the transmitter unit 2 through the first isolation module 32, and displays the data to facilitate reading the voltage signal data. The direct pressure measurement of the sensor 11 can avoid the problems of measurement delay and pressure loss. At the same time, the insulating kit 12 is used to achieve insulation isolation between the sensor 11 and the switch cabinet 100, and the first isolation module 32 and the second isolation module 42 are used to isolate the waveform acquisition module 31 and the power supply 41 from the transmitter unit 2, which can effectively avoid damage to the pressure measurement device and interference with the measurement signal.

[0026] Specifically, in this embodiment, the transmitter unit 2, the first isolation module 32, the second isolation module 42 and the low-pass filter module 312 are arranged in a metal housing 5. Among them, the first isolation module 32 is a signal isolation module arranged in the power supply circuit, and the second isolation module 32 is a power isolation module arranged in the signal transmission circuit, which can effectively prevent the power supply 41 and the waveform acquisition device from being damaged by the arc or high voltage when the fault arc hits the measuring device or the high voltage breaks through the insulation kit 12 during the test, but is not limited to this.

[0027] See also Figure 1 and Figure 2The insulating sleeve 12 is T-shaped and includes a nut portion 121 and a hollow sleeve portion 122. The outer wall and the inner wall of the sleeve portion 122 are both provided with threads. The sleeve portion 122 is inserted into the through hole 101 of the switch cabinet 100, and the nut portion 121 is arranged in contact with the inner wall of the switch cabinet 100.

[0028] Optionally, the insulating kit 12 is made of resin material.

[0029] Specifically, in this embodiment, the sensor 11 of the sensing unit 1 is threadedly connected to the sleeve portion 122 of the insulating kit 12 and is fixedly mounted on the through hole 101 of the switch cabinet 100. There is no metal connection between the sensor 11 and the cabinet body of the switch cabinet 100, which can effectively prevent the cabinet body of the switch cabinet 100 from being energized during the breaking test and the arcing test and transmitting electromagnetic interference to the sensing unit 1, thereby damaging the pressure measuring device and interfering with the measurement signal. Therefore, the size of the insulating kit 12 can be selected according to the actual need to achieve the insulation voltage, which can achieve a maximum insulation voltage of 40.5KV, but is not limited to this.

[0030] See also Figure 1 and Figure 2 The direct pressure measuring device also includes a shielded cable 6, the two ends of which are respectively connected to the transmission unit 2 and the sensor 11. The transmission unit 2 provides a working voltage to the sensor 11 through the shielded cable 6, and the sensor 11 sends an analog voltage signal to the transmission unit 2 through the shielded cable 6.

[0031] Specifically, in this embodiment, the transmitter unit 2 transmits the analog voltage signal input through the shielded cable 6 to a standard voltage signal of DC0V-5V, and outputs it to the first isolation module 32. The first isolation module 32 is connected to the transmitter unit 2 and the low-pass filter module 312 through a cable, which can achieve a high voltage isolation of up to 6kV between the input end and the output end, but is not limited thereto.

[0032] See also Figure 1 and Figure 2 The waveform acquisition module 31 includes an oscilloscope 311 and a low-pass filter module 312. The input end of the low-pass filter module 312 is connected to the output end of the first isolation module 32. The low-pass filter module 312 is used to filter out high-frequency interference signals output by the sensor unit 1, the transmitter unit 2 and the first isolation module 32. The output end of the low-pass filter module 312 is connected to the input end of the oscilloscope 311. The oscilloscope 311 is used to convert the standard voltage signal into a waveform signal and display it.

[0033] Specifically, in this embodiment, a low-pass filter module 312 is provided on the signal transmission loop, which is connected to the oscilloscope 311 via a cable. The low-pass filter module 312 includes an RLC filter circuit, which can cut off signals with a frequency of 10 kHz, so as to effectively absorb the electromagnetic interference during the filtering test and the high-frequency interference existing in the pressure signal generated during the operation of the sensor unit 1, the transmitter unit 2 and the first isolation module 32 to a certain extent. In addition, since the low-pass filter module 312 blocks the antenna effect of the measurement loop, it can also effectively eliminate the power frequency interference transmitted from the oscilloscope 311.

[0034] See also Figure 1 and Figure 2 The power supply 41 is a battery, and the battery is used to output a DC21.5V-26.5V voltage to the second isolation module 42. The second isolation module 42 is used to stabilize the voltage output by the battery to output a DC24V working voltage to the transmission unit 2.

[0035] Specifically, in this embodiment, a battery is used to provide working voltage for the transmitter unit 2 and the sensor 11, which can avoid harmonic interference, peak interference, etc. to the pressure measurement signal caused by a conventional DC switching power supply when it is working; and the second isolation module 42 is connected to the battery and the transmitter unit 2 through a cable, which can achieve isolation of a high voltage of up to 6kV between the input and output ends, but is not limited to this.

[0036] The above disclosure is only the preferred embodiment of the present invention, which certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention are still within the scope covered by the present invention.

Claims

1. A direct pressure measurement device, characterized in that: include: A sensing unit, wherein the sensing unit comprises a sensor and an insulating kit, wherein the sensor comprises a sensing end, the insulating kit is sleeved on the sensing end, the sensing end is arranged in a through hole of the switch cabinet, and the sensor is used to output an analog voltage signal according to the pressure sensed by the sensing end; A transmitter unit, the transmitter unit is connected to the sensor, and the transmitter unit is used to convert the analog voltage signal into a standard voltage signal; A signal acquisition unit, the signal acquisition unit includes a waveform acquisition module and a first isolation module, the input end of the first isolation module is connected to the output end of the transmission unit, the first isolation module is used to output a voltage signal with the same amplitude and phase as its input end through its output end, the output end of the first isolation module is connected to the input end of the waveform acquisition module, and the waveform acquisition module is used to display data of the standard voltage signal; A power supply unit, the power supply unit includes a power supply and a second isolation module, the output end of the power supply is connected to the input end of the second isolation module, the output end of the second isolation module is connected to the input end of the transmitter unit, the second isolation module is used to isolate the high voltage output by the transmitter unit, and the power supply is used to provide working voltage to the transmitter unit and the sensor.

2. The direct pressure measurement device according to claim 1, characterized in that: The insulating sleeve is T-shaped and includes a nut portion and a hollow sleeve portion. The outer wall and the inner wall of the sleeve portion are both provided with threads. The sleeve portion is inserted into the through hole of the switch cabinet, and the nut portion is fitted with the inner wall of the switch cabinet.

3. The direct pressure measurement device according to claim 1, characterized in that: The insulation set is made of resin material.

4. The direct pressure measurement device according to claim 1, characterized in that: It also includes a shielded cable, the two ends of which are respectively connected to the transmitter unit and the sensor, the transmitter unit provides a working voltage to the sensor through the shielded cable, and the sensor sends an analog voltage signal to the transmitter unit through the shielded cable.

5. The direct pressure measurement device according to claim 1, characterized in that: The waveform acquisition module includes an oscilloscope and a low-pass filter module. The input end of the low-pass filter module is connected to the output end of the first isolation module. The low-pass filter module is used to filter out high-frequency interference signals output by the sensor unit, the transmitter unit and the first isolation module. The output end of the low-pass filter module is connected to the input end of the oscilloscope. The oscilloscope is used to convert the standard voltage signal into a waveform signal and display it.

6. The direct pressure measurement device according to claim 1, characterized in that: The power supply is a battery, and the battery is used to output a voltage of DC21.5V-26.5V to the second isolation module. The second isolation module is used to stabilize the voltage output by the battery to output a DC24V working voltage to the transmission unit.

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