CN218865215U

CN218865215U - Pressure type liquid level meter

Info

Publication number: CN218865215U
Application number: CN202223019320.0U
Authority: CN
Inventors: 李钦; 李浩宇; 姜合
Original assignee: Shenyang Zhongsheng Automation Technology Co ltd
Current assignee: Shenyang Zhongsheng Automation Technology Co ltd
Priority date: 2022-11-14
Filing date: 2022-11-14
Publication date: 2023-04-14
Anticipated expiration: 2032-11-14

Abstract

Pressure type level gauge belongs to level measurement technical field, especially relates to a pressure type level gauge. The utility model provides a hydraulic pressure (can mainly be used the detection of oil pressure) detect reliable, the high pressure type level gauge of precision (can mainly regard as the use of oil level gaugember). The utility model discloses a pressure sensor and controller, its characterized in that pressure sensor's detection signal output port links to each other with the detection signal input port of controller, and the controller has the display screen that shows the liquid level (can mainly be used show the oil level) and/or has the signal transmission port that carries out signal transmission with liquid level supervisory equipment (can mainly be oil level supervisory equipment).

Description

Pressure type liquid level meter

Technical Field

The utility model belongs to the technical field of the level measurement device, especially, relate to a pressure type level gauge.

Background

The oil level gauge is a device for detecting the height of an oil level, and is widely used in a transformer oil storage cabinet. The conventional pointer-type oil level gauge 101 detects a change in the height of the oil level by a mechanical mechanism and indicates the oil level by an oil level gauge dial. Since the conventional pointer-type oil level gauge 101 detects the oil level by a mechanical mechanism, sometimes the oil level is not indicated or is not accurately indicated due to damage or jamming of the mechanical mechanism, and a false oil level occurs. Therefore, the detection reliability and accuracy of the existing oil level gauge are yet to be further improved.

SUMMERY OF THE UTILITY MODEL

The utility model discloses just to above-mentioned problem, a pressure type level gauge (can mainly regard as the use of oil level gaugember) that hydraulic pressure (can mainly be used the detection of oil pressure) detect reliably, the precision is high is provided.

In order to achieve the above object, the present invention adopts the following technical solution, the present invention includes a pressure sensor and a controller, wherein the detection signal output port of the pressure sensor is connected to the detection signal input port of the controller, and the controller has a display screen for displaying the liquid level (mainly used for displaying the oil level) and/or a signal transmission port for transmitting signals with the liquid level monitoring device (mainly used for monitoring the oil level).

As another preferred scheme, the signal transmission port of the utility model discloses a controller links to each other with the signal transmission port of the liquid level (can mainly be used for indicating the oil level) indicator part that has the pointer dial plate.

As another preferred scheme, the utility model discloses liquid level indication part adopts the milliammeter.

As another preferred scheme, the liquid level indicator part sets up on the casing, and pressure sensor sets up in the casing, is provided with the inlet (can mainly be used the oil feed) corresponding to pressure sensor's detection head position on the casing, and inlet department is provided with the adapting unit with stock solution cabinet (can mainly be used the oil storage).

As another preferred scheme, the inner wall of the shell close to the liquid inlet is provided with a supporting clapboard, and the middle part of the supporting clapboard is provided with a threaded hole corresponding to the external thread on the pressure sensor; a flange plate is arranged at the liquid inlet; the shell is provided with a wire passing hole corresponding to the connecting wire of the pressure sensor and the liquid level indicating component.

As another preferred scheme, the controller adopts guide rail mounting structure.

As another preferred scheme, the utility model discloses the guide rail setting is at the lower extreme middle part of controller.

As another kind of preferred scheme, the controller includes the main control part, 485 transmission part, current output part, output control part and power conversion part, the signal transmission port of main control part links to each other with 485 transmission part's signal transmission port, the signal output part of main control part links to each other with current output part's signal input port, the control signal output part of main control part links to each other with output control part's control signal input port, 485 transmission part's signal transmission port links to each other with pressure sensing component's detection signal output port, power conversion part's electric energy output port respectively with main control part's power port, 485 transmission part's power port, current output part's power port, output control part's power port links to each other.

As another preferred scheme, the main control part of the utility model adopts an STC8H1K28-32PIN chip U1, the 8 PINs of U1 are respectively connected with a connector P1, a voltage regulator diode D1 cathode, one end of a resistor R2, one end of a capacitor C1, and one end of a capacitor C2 through a resistor R1, and the anode of D1 is respectively connected with a GND, the other end of R2, the other end of C1, and the other end of C2;

the pin 9 of U1 is connected with the pin 7 of the connector J4, the

pins

8 and 9 of J4 are connected with GND, the

pins

10 and 11 of U1 are connected with +5V, the pin 12 of U1 is connected with GND, the pin 13 of U1 is connected with the pin 2 of the connector J6, the pin 1 of J6 is connected with +5V, the pin 14 of U1 is connected with the

pins

3 and 5 of J4 of J6, the pin 4 of J6 is connected with GND, the pin 15 of U1 is connected with the pin 4 of J4, the pin 16 of U1 is connected with the pin 3 of J4, the pin 17 of U1 is connected with the pin 2 of J4, and the pin 18 of U1 is connected with the pin 1 of J4; the pins 24-32 of U1 are correspondingly connected with the pins 1-9 of the connector J3.

As another preferred scheme, 485 transmission part includes first 485 transmission chip, 1 foot of first 485 transmission chip links to each other with the signal transmission port of main control part, 2, 3 feet of first 485 transmission chip link to each other with resistance R29 one end, the signal transmission port of main control part respectively, R29 other end connects GND, 4 feet of first 485 transmission chip link to each other with the signal transmission port of main control part, 5 feet of first 485 transmission chip connect GND, 6 feet of first 485 transmission chip link to each other with resistance R30 one end, resistance R28 one end respectively, R30 other end connects +5V, the R28 other end links to each other with zener diode D13 negative pole, zener diode D12 negative pole, connector P1 respectively, D12 positive pole respectively with GND, zener diode D11 positive pole, resistance R26 one end links to each other, the R26 other end respectively with 7 feet of first 485 transmission chip, resistance R27 one end links to each other, the R27 other end links to each other with D11 negative pole, D13 negative pole, connector P1 respectively, 8 feet of first 485 transmission chip connect +5V.

As another preferred scheme, 485 transmission part still includes second 485 transmission chip, 1 foot of second 485 transmission chip links to each other with the signal transmission port of main control part, 2, 3 feet of second 485 transmission chip respectively with resistance R16 one end, the signal transmission port of main control part links to each other, R16 another termination GND, 4 feet of second 485 transmission chip link to each other with the signal transmission port of main control part, 5 feet of second 485 transmission chip connect GND, 6 feet of second 485 transmission chip respectively with resistance R17 one end, resistance R13 one end links to each other, R17 another termination +5V, the R13 other end respectively with zener diode D7 negative pole, zener diode D6 negative pole, connector J5 links to each other, D6 positive pole respectively with GND, zener diode D5 positive pole, resistance R10 one end links to each other, the R10 other end respectively with 7 feet of second 485 transmission chip, resistance R12 one end links to each other, the R12 other end respectively with D5 negative pole, D7 connector, positive pole J5 links to each other, 8 feet of second 485 transmission chip connect +5V.

As another preferred scheme, the current output part of the present invention includes an XTR111 chip U2, pin 1 of U2 is connected to +24v, pin 6 of U2 is connected to one end of a capacitor C3 and one end of a resistor R5, respectively, the other end of C3 is connected to GND, the other end of R5 is connected to one end of a capacitor C4 and one end of a resistor R6, the other end of C4 is connected to GND, and the other end of R6 is connected to a signal output port of the main control part;

pins

9, 10 and 11 of U2 are connected with GND, and pin 7 of U2 is connected with GND through a resistor R9; pin 2 of U2 links to each other with resistance R4 one end, PNP triode Q2 projecting pole respectively, and the other end of R4 links to each other with SI2309 pipe Q3 drain electrode, Q2 base electrode respectively, and Q2 collecting electrode links to each other with Q3 grid, pin 3 of U2 respectively, and Q3 source electrode links to each other with resistance R7 one end, electric capacity C5 one end respectively, and C5 other end connects GND, and the other end of R7 links to each other with connector P1 through diode D3.

As another preferred scheme, the current output part of the present invention further includes XTR111 chips U3, U4, pin 1 of U3 is connected to +24v, pin 6 of U3 is connected to one end of capacitor C6 and one end of resistor R14, respectively, the other end of C6 is connected to GND, the other end of R14 is connected to one end of capacitor C7 and one end of resistor R15, the other end of C7 is connected to GND, and the other end of R15 is connected to the signal output port of the main control part;

pins

9, 10 and 11 of U3 are connected with GND, and pin 7 of U3 is connected with GND through a resistor R19; pin 2 of U3 is connected with one end of a resistor R11 and an emitting electrode of a PNP triode Q5 respectively, the other end of R11 is connected with a drain electrode of a Q6 of a SI2309 tube and a base electrode of Q5 respectively, a collector electrode of Q5 is connected with a grid electrode of Q6 and a pin 3 of U3 respectively, a source electrode of Q6 is connected with one end of a resistor R18 and one end of a capacitor C8 respectively, the other end of C8 is connected with GND, and the other end of R18 is connected with a connector P1 through a diode D8;

a pin 1 of U4 is connected with +24V, a pin 6 of U4 is respectively connected with one end of a capacitor C9 and one end of a resistor R21, the other end of C9 is connected with GND, the other end of R21 is respectively connected with one end of a capacitor C10 and one end of a resistor R22, the other end of C10 is connected with GND, and the other end of R22 is connected with a signal output port of the main control part;

pins

9, 10 and 11 of U4 are connected with GND, and pin 7 of U4 is connected with GND through a resistor R24; pin 2 of U4 links to each other with resistance R20 one end, PNP triode Q7 projecting pole respectively, and the R20 other end links to each other with SI2309 pipe Q8 drain electrode, Q7 base respectively, and Q7 collecting electrode links to each other with Q8 grid, pin 3 of U4 respectively, and Q8 source links to each other with resistance R23 one end, electric capacity C11 one end respectively, and C11 other end connects GND, and the R23 other end passes through diode D9 and links to each other with connector P1.

As another preferred scheme, output control part includes NPN triode Q1, and Q1 projecting pole connects GND, and the Q1 base connects main control unit's control signal output port through resistance R3, and Q1 collecting electrode links to each other with diode D2 positive pole, relay K1 control end one end respectively, and the D2 negative pole connects +24V, another termination of K1 control end +24V, K1 controlled switch links to each other with connector J5, DC24V respectively.

As another preferred scheme, output control part still includes NPN triode Q4, and Q4 projecting pole connects GND, and the Q4 base connects main control unit's control signal output port through resistance R8, and Q4 collecting electrode links to each other with diode D4 positive pole, relay K2 control end one end respectively, and the D4 negative pole connects +24V, and another termination of K2 control end +24V, K2 controlled switch link to each other with connector J5, DC24V respectively.

Secondly, the power conversion part of the utility model comprises a connector J7, wherein 1 pin of the J7 is respectively connected with one end of a piezoresistor R25, one ends of connectors J5 and C17, the other end of the R25 is respectively connected with one end of a J5, one end of a capacitor C12 and 2 pins of the J7, and the other end of the C12 is respectively connected with the other ends of the J5 and the C17; the 4 pins of the J7 are connected with GND, the 5 pins of the J7 are respectively connected with +24V, the anode of a capacitor C15, the anode of a capacitor C20, one end of a capacitor C19 and the Vin port of a 7805 module VR1, the GND port of the VR1 is respectively connected with GND, the cathode of the C15, the cathode of the C20, the other end of the C19, the cathode of the capacitor C16 and one end of a capacitor C18, and the other end of the C18 is respectively connected with the Vout end of the VR1, the anode of the C16 and +5V.

Additionally, the display screen of controller adopts 3911 charactron module DS1 ~ DS4, DS1 ~ DS4 ' S1, 2, 4, 5, 6, 7, 9, 10 feet correspond continuously, DS1 ' S1, 2, 4, 5, 6, 7, 9, 10 feet respectively with connector J1 2 ~ 5, 9 ~ 6 feet correspond continuously, DS1 ' S3, 8 feet connect J1 ' S1 foot, DS2 ' S3, 8 feet link to each other with connector J2 ' S1 foot, DS3 ' S3, 8 feet link to each other with connector J2 ' S2 foot, DS4 ' S3, 8 feet link to each other with connector J2 ' S3 feet, J2 ' S4 feet connect GND through switch S1, J2 ' S5 feet connect GND through switch S2, J2 ' S6 feet connect GND through switch S3, J2 ' S7 feet connect GND through switch S4, J2 ' S8, 9 feet connect GND.

The utility model has the advantages of.

The utility model discloses a pressure sensor sends the oil pressure that detects for the controller, and the controller converts out oil level information through the oil pressure (the oil level of converting out through the oil pressure is current conventional technique), and relevant oil level supervisory equipment is sent for to rethread signal transmission port, realizes the control of oil level. The oil level information can also be displayed through a display screen on the controller. The utility model discloses do not detect the oil level through mechanical mechanism, can not make the oil gauge not instruct or instruct inaccurate because of mechanical mechanism's damage or jamming, avoid appearing the condition of false oil level. Therefore the utility model discloses oil pressure detection is reliable, the precision is high.

Drawings

The present invention will be further described with reference to the accompanying drawings and the following detailed description. The scope of protection of the present invention is not limited to the following description.

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is an external view of the present invention.

Fig. 3 is a schematic view of a pressure sensor structure.

Fig. 4 and 5 are schematic structural diagrams of the controller of the present invention.

Fig. 6-13 are schematic views of eight using modes of the present invention.

Fig. 14 and 15 are schematic views of the usage state of the present invention.

Fig. 16 is an exploded view of the present invention.

Fig. 17 to 21 are schematic diagrams of the controller circuit of the present invention.

In the figure, 1 is an oil level indicating member, 2 is a casing, 3 is a support partition, 4 is a flange, 5 is a pressure sensor, 6 is a dial plate of a pointer, 7 is a guide rail, and 8 is a controller.

100 is an oil conservator, 101 is a conventional pointer oil level indicator, and 102 is a valve.

Detailed Description

As shown in the figure, the utility model discloses a pressure sensor 5 and controller 8, pressure sensor 5's detection signal output port links to each other with controller 8's detection signal input port, and controller 8 has the display screen DS1 ~ DS4 (DS 1 ~ DS4 corresponds with the reference numeral in the circuit diagram) that shows the oil level and/or has the signal transmission port that carries out signal transmission with oil level supervisory equipment.

The signal transmission port of the controller 8 is connected to the signal transmission port of the oil level indicating member 1 having the dial plate 6.

The oil level indicating member 1 employs a milliammeter. The milliammeter can adopt LS110 series or WDG110 series milliammeter, and the dial plate and the pointer of the LS110 series or WDG110 series milliammeter can be modified to be larger, so that the field observation is facilitated.

The oil level indicating component 1 is arranged on the shell 2, the pressure sensor 5 is arranged in the shell 2, an oil inlet is arranged on the shell 2 corresponding to the position of a detection head of the pressure sensor 5, and a connecting component with the oil conservator 100 is arranged at the oil inlet. By integrating the oil level indicating member 1 and the pressure sensor 5, a customer can select various operation modes. The signal transmission port of the controller 8 can be connected with a touch screen (the touch screen can display information such as the height of the oil surface) or a computer (the computer can be arranged in a control room) for remote monitoring, or the oil level can be observed only by observing the pointer dial 6.

The oil level indicating part 1 and the pointer dial 6 can be of an integral structure, during installation, the outer pressing ring 50 is connected with the casing 2 through screws, a gasket (not shown in the figure) is arranged between the outer end face 51 of the outer pressing ring 50 and the pointer dial 6, and when the outer pressing ring 50 is fixedly connected with the casing 2, the gasket presses the pointer dial 6 to enable the pointer dial 6 to be fixedly connected with the casing 2.

A supporting partition plate 3 is arranged on the inner wall of the shell 2 close to the oil inlet, a threaded hole (raw rubber belt can be wound on the external thread of the pressure sensor 5 or an O-shaped sealing ring is sleeved for sealing) corresponding to the external thread of the pressure sensor 5 is arranged in the middle of the supporting partition plate 3 (the pressure sensor 5 with the thread can adopt a pressure sensor with the model of M20G100 kPa-2-A1-F1-L2); a flange plate 4 (the flange plate 4 is the connecting part) is arranged at the oil inlet; the casing 2 is provided with a line hole corresponding to the connection line of the pressure sensor 5 and the oil level indicating component 1, the line hole is provided with a connecting seat, the connecting seat 30 is provided with an aviation plug 31, and the connection line of the pressure sensor 5 and the oil level indicating component 1 is connected with an external transmission line through the aviation plug. As shown in figure 1, oil is contacted with a detection head of the pressure sensor 5 through an oil inlet, oil pressure detection of the pressure sensor 5 is realized, the supporting partition plate 3 is used for blocking the oil, and the oil cannot enter the right area of the supporting partition plate 3. The oil pressure detection port of the oil conservator 100 is connected with the flange 4, and the installation is reliable and convenient.

As shown in fig. 6 to 13, the pressure sensor 5 may be a pressure sensor that outputs an analog quantity detection signal (analog quantity detection signal is received through the 8-pin of U1 of the controller 8), or may be a pressure sensor that outputs a digital quantity detection signal (digital quantity detection signal is received through the first 485 transmission chip of the controller 8). The pressure sensor 5 for outputting RS485 signals can adopt an SP01 (0-1.6 MPa) pressure sensor.

The pressure sensor 5 outputting the analog quantity signal can adopt a pressure sensor of 4-20mA, M20X 1.5 and 100 kPa.

The controller 8 adopts a guide rail 7 mounting structure. The guide rail 7 can be a conventional standard 35mm guide rail, and the controller 8 can be installed in an electric cabinet on the side of the transformer. A touch screen can be arranged on the electric cabinet, and a signal transmission port of the controller 8 is connected with a signal transmission port of the touch screen.

The guide rail 7 is arranged in the middle of the lower end of the controller 8.

The controller 8 comprises a main control part, a 485 transmission part, a current output part, an output control part and a power supply conversion part, wherein a signal transmission port of the main control part is connected with a signal transmission port of the 485 transmission part, a signal output port of the main control part is connected with a signal input port of the current output part, a control signal output port of the main control part is connected with a control signal input port of the output control part, a signal transmission port of the 485 transmission part is connected with a detection signal output port of the pressure sensing part, and an electric energy output port of the power supply conversion part is respectively connected with a power supply port of the main control part, a power supply port of the 485 transmission part, a power supply port of the current output part and a power supply port of the output control part.

The main control part adopts an STC8H1K28-32PIN chip U1, 8 PINs of the U1 are respectively connected with a connector P1 (11 PINs of the P1 are used for receiving analog quantity detection signals output by the pressure sensor 5), a cathode of a voltage-stabilizing diode D1, one end of a resistor R2, one end of a capacitor C1 and one end of a capacitor C2 through a resistor R1, and an anode of the D1 is respectively connected with GND, the other end of the R2, the other end of the C1 and the other end of the C2; r1, D1, R2, C1, C2 constitute the input transmission circuit of analog quantity pressure measurement signal, and this input transmission circuit plays fine steady voltage current-limiting effect.

The pin 9 of U1 is connected with the pin 7 of a connector J4 (J4 and J2 are corresponding insertion ports, and J4 is inserted into J2 in use), the

pins

8 and 9 of J4 are connected with GND, the

pins

10 and 11 of U1 are connected with +5V and 12 of U1 are connected with GND, the pin 13 of U1 is respectively connected with the pin 2 of a connector J6 (J6 is a programming port), the pin 1 of J6 is connected with +5V, the pin 14 of U1 is respectively connected with the pin 3 of J6 and the pin 5 of J4, the pin 4 of J6 is connected with GND, the pin 15 of U1 is connected with the pin 4 of J4, the pin 16 of U1 is connected with the pin 3 of J4, the pin 17 of U1 is connected with the pin 2 of J4, and the pin 18 of U1 is connected with the pin 1 of J4; the pins 24-32 of U1 are connected with the pins 1-9 of the connector J3 (J3 and J1 are corresponding plug ports, and J3 and J1 are plugged in use) respectively.

The 485 transmission part comprises a first 485 transmission chip, wherein a pin 1 of the first 485 transmission chip is connected with a signal transmission port of the main control part, pins 2 and 3 of the first 485 transmission chip are respectively connected with one end of a resistor R29 and the signal transmission port of the main control part, the other end of the R29 is connected with GND, a pin 4 of the first 485 transmission chip is connected with the signal transmission port of the main control part, a pin 5 of the first 485 transmission chip is connected with GND, a pin 6 of the first 485 transmission chip is respectively connected with one end of a resistor R30 and one end of a resistor R28, the other end of the R30 is connected with +5V, the other end of the R28 is respectively connected with a cathode of a voltage stabilizing diode D13, a cathode of a voltage stabilizing diode D12 and a connector P1, an anode of the D12 is respectively connected with GND, an anode of the voltage stabilizing diode D11 and one end of a resistor R26, the other end of the R26 is respectively connected with a pin 7 of the first 485 transmission chip and one end of the resistor R27, the other end of the R27 is respectively connected with a cathode of the D11, an anode of the D13 and the connector P1, and the other end of the first 485 transmission chip is connected with a pin 8 of the cathode of the +5V.

The 485 transmission part also comprises a second 485 transmission chip, wherein pin 1 of the second 485 transmission chip is connected with a signal transmission port of the main control part, pins 2 and 3 of the second 485 transmission chip are respectively connected with one end of a resistor R16 and the signal transmission port of the main control part, the other end of the R16 is connected with GND, pin 4 of the second 485 transmission chip is connected with the signal transmission port of the main control part, pin 5 of the second 485 transmission chip is connected with GND, pin 6 of the second 485 transmission chip is respectively connected with one end of a resistor R17 and one end of a resistor R13, the other end of the R17 is connected with +5V, the other end of the R13 is respectively connected with a cathode of a voltage stabilizing diode D7, a cathode of a voltage stabilizing diode D6 and a connector J5, the anode of D6 is respectively connected with GND, the anode of the voltage stabilizing diode D5 and one end of a resistor R10, the other end of the R10 is respectively connected with pin 7 of the second 485 transmission chip and one end of a resistor R12, the other end of the R12 is respectively connected with the cathode of the D5, the anode of the D7 and the connector J5, and the pin 8 of the second 485 transmission chip is connected with +5V. The second 485 transmitting chip may be used to communicate with a computer or touch screen. U1 converts the received pressure signal into a fuel level signal, and the conversion of the pressure signal into a fuel level signal is a conventional technique, i.e., a routine for converting a conventional pressure signal into a fuel level signal is written in U1 through the aforementioned J6.

The current output part comprises an XTR111 chip U2, a pin 1 of the U2 is connected with +24V, a pin 6 of the U2 is respectively connected with one end of a capacitor C3 and one end of a resistor R5, the other end of the C3 is connected with GND, the other end of the R5 is respectively connected with one end of a capacitor C4 and one end of a resistor R6, the other end of the C4 is connected with GND, and the other end of the R6 is connected with a signal output port of the main control part; pins 9, 10 and 11 of U2 are connected with GND, and pin 7 of U2 is connected with GND through a resistor R9; pin 2 of U2 links to each other with resistance R4 one end, PNP triode Q2 projecting pole respectively, and the R4 other end links to each other with SI2309 pipe Q3 drain electrode, Q2 base respectively, and Q2 collecting electrode links to each other with Q3 grid, pin 3 of U2 respectively, and Q3 source electrode links to each other with resistance R7 one end, electric capacity C5 one end respectively, and C5 other termination GND, and the R7 other end passes through diode D3 and links to each other with connector P1.

The current output part also comprises XTR111 chips U3 and U4, pin 1 of U3 is connected with +24V, pin 6 of U3 is respectively connected with one end of a capacitor C6 and one end of a resistor R14, the other end of C6 is connected with GND, the other end of R14 is respectively connected with one end of a capacitor C7 and one end of a resistor R15, the other end of C7 is connected with GND, and the other end of R15 is connected with a signal output port of the main control part; pins 9, 10 and 11 of U3 are connected with GND, and pin 7 of U3 is connected with GND through a resistor R19; pin 2 of U3 is connected with one end of a resistor R11 and an emitting electrode of a PNP triode Q5 respectively, the other end of R11 is connected with a drain electrode of a Q6 of a SI2309 tube and a base electrode of Q5 respectively, a collector electrode of Q5 is connected with a grid electrode of Q6 and a pin 3 of U3 respectively, a source electrode of Q6 is connected with one end of a resistor R18 and one end of a capacitor C8 respectively, the other end of C8 is connected with GND, and the other end of R18 is connected with a connector P1 through a diode D8;

a pin 1 of U4 is connected with +24V, a pin 6 of U4 is respectively connected with one end of a capacitor C9 and one end of a resistor R21, the other end of C9 is connected with GND, the other end of R21 is respectively connected with one end of a capacitor C10 and one end of a resistor R22, the other end of C10 is connected with GND, and the other end of R22 is connected with a signal output port of the main control part; pins 9, 10 and 11 of U4 are connected with GND, and pin 7 of U4 is connected with GND through a resistor R24; pin 2 of U4 is connected with one end of a resistor R20 and an emitter of a PNP triode Q7 respectively, the other end of R20 is connected with a drain of a tube Q8 and a base of Q7 of an SI2309 respectively, a collector of Q7 is connected with a grid of Q8 and pin 3 of U4 respectively, a source of Q8 is connected with one end of a resistor R23 and one end of a capacitor C11 respectively, the other end of C11 is connected with GND, and the other end of R23 is connected with a connector P1 through a diode D9.

The output control part comprises an NPN triode Q1 (Q1 is used for driving a low oil level alarm relay K1, the control end of the K1 is electrified and sends out a low oil level alarm signal), the emitting electrode of the Q1 is connected with GND, the base electrode of the Q1 is connected with the control signal output port of the main control part through a resistor R3, the collector electrode of the Q1 is respectively connected with the anode of a diode D2 and one end of the control end of the relay K1, the cathode of the D2 is connected with +24V, the other end of the control end of the K1 is connected with +24V, and a K1 controlled switch is respectively connected with a connector J5 and a DC 24V.

The output control part also comprises an NPN triode Q4 (Q4 is used for driving the high oil level alarm relay K2, the control end of the K2 is electrified and sends out a high oil level alarm signal), the emitting electrode of the Q4 is connected with GND, the base electrode of the Q4 is connected with the control signal output port of the main control part through a resistor R8, the collector electrode of the Q4 is respectively connected with the anode of the diode D4 and one end of the control end of the relay K2, the cathode of the D4 is connected with +24V, the other end of the control end of the K2 is connected with +24V, and the K2 controlled switch is respectively connected with the connector J5 and the DC 24V.

The power supply conversion part comprises a connector J7, wherein 1 pin of the J7 is respectively connected with one end of a piezoresistor R25 and one ends of connectors J5 and C17, the other end of the R25 is respectively connected with one end of a capacitor J5 and one end of a capacitor C12, and 2 pins of the J7, and the other end of the C12 is respectively connected with the other ends of the J5 and the C17; the 4 pins of the J7 are connected with GND, the 5 pins of the J7 are respectively connected with +24V, the anode of a capacitor C15, the anode of a capacitor C20, one end of a capacitor C19 and the Vin port of a 7805 module VR1, the GND port of the VR1 is respectively connected with GND, the cathode of the C15, the cathode of the C20, the other end of the C19, the cathode of the capacitor C16 and one end of a capacitor C18, and the other end of the C18 is respectively connected with the Vout end of the VR1, the anode of the C16 and +5V.

The display screen of the controller 8 adopts 3911 digital tube modules DS 1-DS 4, pins DS 1-DS 4 1, 2, 4, 5, 6, 7, 9 and 10 are correspondingly connected, pins DS1, 2, 4, 5, 6, 7, 9 and 10 are respectively correspondingly connected with pins 2-5 and 9-6 of a connector J1, pins

DS

13 and 8 are connected with pin 1 of the connector J1, pins

DS

23 and 8 are connected with pin 1 of the connector J2, pins DS3 and 8 are connected with pin 2 of the connector J2, pins DS4 and 8 are connected with pin 3 of the connector J2, pin 4 of the connector J2 is connected with GND through a switch S1, pin 5 of the connector J2 is connected with GND through a switch S2, pin 6 of the connector J2 is connected with GND through a switch S3, pin 7 of the connector J2 is connected with GND through a switch S4, and pin 8 and pin 9 of the connector J2 are connected with GND. S1-S4 are keys on the controller 8, and can be used for setting an oil level display range, setting an oil level alarm threshold value and setting a corresponding relation between pressure and an oil level. The working parameters of the controller 8 can also be set through a touch screen or a computer.

The main control part can recalibrate the collected pressure signals, determine zero position and full range and correspondingly output signals of 4 mA-20 mA. Commercially available pressure sensors sometimes need to be recalibrated to determine the zero and full range we need. For example, the measuring range of the pressure sensor is 0-100 Kpa, and the output is corresponding to 4-20 mA; when the pressure sensor is used, the measuring range in such a large range is not needed, for example, 8mA of the sensor can be used as a zero position, 16mA of the sensor can be used as a full measuring range, and 4mA of the controller is output to correspond to 8mA of the pressure sensor; the controller outputs 20mA corresponding to 16mA for the pressure sensor.

As shown in fig. 17, the embodiment of the controller 8 circuit of the present invention has three 4mA to 20mA analog outputs (U2, U3, U4) and one RS485 (second 485 transmission chip) output, and can transmit signals to different kinds of devices. The RS485 output can be connected with a touch screen, the oil level can be monitored, and the controller 8 can be operated, so that the use by a user is facilitated.

VR1 can stabilize voltage, guarantees the device reliable operation. The reverse connection protection can be realized by the D3, the D8 and the D9.

As shown in fig. 14 and 15, the present invention can be used in cooperation with the conventional pointer-type oil level gauge 101 to verify mutual authentication. The upper end of the valve 102 is connected to the original oil outlet of the oil conservator 100 by a flange. The pressure sensor 5 may be a pressure sensor equipped with a flange.

The utility model discloses can adopt three kinds of using-way (1) pressure sensor 5 and controller 8, pressure sensor 5 detects the oil pressure, and controller 8 sends the oil level signal for the computer, and the computer monitors the oil level (having the controller 8 that shows the display screen of oil level, the accessible is observed the display screen and is looked over the oil level). (2) The oil level indicator comprises a pressure sensor 5, a controller 8 and an oil level indicating part 1, wherein the pressure sensor 5 and the oil level indicating part 1 are not arranged in the same shell 2, and the pressure sensor 5 and the oil level indicating part 1 are arranged at different positions of the oil conservator 100. The pressure sensor 5 detects the oil pressure, and the controller 8 outputs a signal to the oil level indicating member 1 and/or a computer, the oil level indicating member 1 indicates the oil level on site, and the computer monitors the oil level. (3) The oil level indicator comprises a pressure sensor 5, a controller 8 and an oil level indicating part 1, wherein the pressure sensor 5 and the oil level indicating part 1 are arranged in the same shell 2, namely the pressure sensor 5 and the oil level indicating part 1 are integrated, and the pressure sensor 5 and the oil level indicating part 1 are arranged at the same position of the oil conservator 100. The pressure sensor 5 detects the oil pressure, and the controller 8 outputs a signal to the oil level indicating member 1 and/or a computer, the oil level indicating member 1 indicates the oil level, and the computer monitors the oil level.

It should be understood that the above detailed description of the present invention is only for illustrating the present invention and is not limited by the technical solutions described in the embodiments of the present invention, and those skilled in the art should understand that the present invention can still be modified or equivalently replaced to achieve the same technical effects; as long as the use requirement is satisfied, the utility model is within the protection scope.

Claims

1. The pressure type liquid level meter comprises a pressure sensor and a controller, and is characterized in that a detection signal output port of the pressure sensor is connected with a detection signal input port of the controller, and the controller is provided with a display screen for displaying liquid level and/or a signal transmission port for transmitting signals with liquid level monitoring equipment.

2. The pressure gauge of claim 1, wherein the signal transmission port of the controller is connected to a signal transmission port of a level indicating member having a pointer dial.

3. A pressure gauge according to claim 2, wherein the level indicator member is a milliammeter.

4. The pressure type liquid level meter according to claim 2, wherein the liquid level indicating member is disposed on the housing, the pressure sensor is disposed in the housing, a liquid inlet is disposed on the housing corresponding to the position of the detection head of the pressure sensor, and a connecting member with the liquid storage tank is disposed at the liquid inlet.

5. The pressure type liquid level gauge according to claim 4, wherein the inner wall of the housing near the liquid inlet is provided with a supporting partition plate, and the middle part of the supporting partition plate is provided with a threaded hole corresponding to the external thread on the pressure sensor; a flange plate is arranged at the liquid inlet; the shell is provided with a wire passing hole corresponding to the connecting wire of the pressure sensor and the liquid level indicating component.

6. The pressure type liquid level gauge according to claim 1, wherein the controller comprises a main control portion, a 485 transmission portion, a current output portion, an output control portion and a power conversion portion, a signal transmission port of the main control portion is connected to a signal transmission port of the 485 transmission portion, a signal output port of the main control portion is connected to a signal input port of the current output portion, a control signal output port of the main control portion is connected to a control signal input port of the output control portion, a signal transmission port of the 485 transmission portion is connected to a detection signal output port of the pressure sensing member, and a power output port of the power conversion portion is respectively connected to a power port of the main control portion, a power port of the 485 transmission portion, a power port of the current output portion, and a power port of the output control portion.

7. The pressure type liquid level gauge according to claim 6, wherein the main control portion employs an STC8H1K28-32PIN chip U1, the 8 PINs of U1 are respectively connected to the connector P1, the cathode of the voltage regulator diode D1, one end of a resistor R2, one end of a capacitor C1, and one end of a capacitor C2 through a resistor R1, and the anode of D1 is respectively connected to GND, the other end of R2, the other end of C1, and the other end of C2;

the pin 9 of U1 is connected with the pins 7 of the connectors J4 and J4, the pins 8 and 9 of J4 are connected with GND, the pins 10 and 11 of U1 are connected with +5V, the pin 12 of U1 is connected with GND, the pin 13 of U1 is respectively connected with the pin 2 of the connector J6, the pin 1 of J6 is connected with +5V, the pin 14 of U1 is respectively connected with the pins 3 and 5 of J4 of J6, the pin 4 of J6 is connected with GND, the pin 15 of U1 is connected with the pin 4 of J4, the pin 16 of U1 is connected with the pin 3 of J4, the pin 17 of U1 is connected with the pin 2 of J4, and the pin 18 of U1 is connected with the pin 1 of J4; the pins 24-32 of U1 are correspondingly connected with the pins 1-9 of the connector J3.

8. The pressure-type liquid level gauge as claimed in claim 6, wherein the 485 transmission portion comprises a first 485 transmission chip, wherein 1 pin of the first 485 transmission chip is connected to the signal transmission port of the main control portion, 2 and 3 pins of the first 485 transmission chip are respectively connected to one end of a resistor R29 and the signal transmission port of the main control portion, the other end of R29 is connected to GND, 4 pins of the first 485 transmission chip are connected to the signal transmission port of the main control portion, 5 pins of the first 485 transmission chip are connected to GND, 6 pins of the first 485 transmission chip are respectively connected to one end of a resistor R30 and one end of a resistor R28, the other end of R30 is connected to +5V, the other end of R28 is respectively connected to a cathode of a zener diode D13, a cathode of a zener diode D12 and a connector P1, an anode of a D12 is respectively connected to GND, an anode of a zener diode D11 and one end of a resistor R26, the other end of R26 is respectively connected to one end of a pin of a resistor R27 and the other end of the first 485 transmission chip is connected to a cathode of a D11, an anode of a D13 and an anode of a connector P1, and a pin of a connector P11 is respectively connected to the other end of a connector P11, and a pin of a pin 8 pin of the first 485 transmission chip is connected to a cathode of a connector P11;

the 485 transmission part also comprises a second 485 transmission chip, wherein a pin 1 of the second 485 transmission chip is connected with a signal transmission port of the main control part, pins 2 and 3 of the second 485 transmission chip are respectively connected with one end of a resistor R16 and the signal transmission port of the main control part, the other end of the R16 is connected with GND, a pin 4 of the second 485 transmission chip is connected with the signal transmission port of the main control part, a pin 5 of the second 485 transmission chip is connected with GND, a pin 6 of the second 485 transmission chip is respectively connected with one end of a resistor R17 and one end of a resistor R13, the other end of the R17 is connected with +5V, the other end of the R13 is respectively connected with a cathode of a zener diode D7, a cathode of a zener diode D6 and a connector J5, the anode of the D6 is respectively connected with GND, an anode of the zener diode D5 and one end of a resistor R10, the other end of the R10 is respectively connected with a pin 7 of the second 485 transmission chip and one end of a resistor R12, the other end of the R12 is respectively connected with a cathode of the D5, the anode of the D7 and the connector J5, and the other end of the second 485 transmission chip is respectively connected with a cathode of the D5, the anode of the D7 and the connector J5, and the pin 8 of the second 485 transmission chip is connected with +5V.

9. The pressure-type liquid level gauge according to claim 6, wherein the current output portion comprises an XTR111 chip U2, pin 1 of U2 is connected to +24V, pin 6 of U2 is connected to one end of a capacitor C3 and one end of a resistor R5 respectively, the other end of C3 is connected to GND, the other end of R5 is connected to one end of a capacitor C4 and one end of a resistor R6 respectively, the other end of C4 is connected to GND, and the other end of R6 is connected to a signal output port of the main control portion; pins 9, 10 and 11 of U2 are connected with GND, and pin 7 of U2 is connected with GND through a resistor R9; pin 2 of U2 is connected with one end of a resistor R4 and an emitting electrode of a PNP triode Q2 respectively, the other end of R4 is connected with a drain electrode of a Q3 of a SI2309 tube and a base electrode of Q2 respectively, a collector of Q2 is connected with a grid electrode of Q3 and pin 3 of U2 respectively, a source electrode of Q3 is connected with one end of a resistor R7 and one end of a capacitor C5 respectively, the other end of C5 is connected with GND, and the other end of R7 is connected with a connector P1 through a diode D3;

a pin 1 of U4 is connected with +24V, a pin 6 of U4 is respectively connected with one end of a capacitor C9 and one end of a resistor R21, the other end of C9 is connected with GND, the other end of R21 is respectively connected with one end of a capacitor C10 and one end of a resistor R22, the other end of C10 is connected with GND, and the other end of R22 is connected with a signal output port of the main control part; pins 9, 10 and 11 of U4 are connected with GND, and pin 7 of U4 is connected with GND through a resistor R24; pin 2 of U4 links to each other with resistance R20 one end, PNP triode Q7 projecting pole respectively, and the R20 other end links to each other with SI2309 pipe Q8 drain electrode, Q7 base respectively, and Q7 collecting electrode links to each other with Q8 grid, pin 3 of U4 respectively, and Q8 source links to each other with resistance R23 one end, electric capacity C11 one end respectively, and C11 other end connects GND, and the R23 other end passes through diode D9 and links to each other with connector P1.

10. The pressure type liquid level meter according to claim 6, wherein the output control portion comprises an NPN triode Q1, an emitter of the Q1 is connected with GND, a base of the Q1 is connected with a control signal output port of the main control portion through a resistor R3, a collector of the Q1 is respectively connected with an anode of a diode D2 and one end of a control end of a relay K1, a cathode of the D2 is connected with +24V, the other end of the control end of the K1 is connected with +24V, and a controlled switch of the K1 is respectively connected with a connector J5 and a DC 24V;

the output control part also comprises an NPN triode Q4, the emitter of the Q4 is connected with GND, the base of the Q4 is connected with the control signal output port of the main control part through a resistor R8, the collector of the Q4 is respectively connected with the anode of a diode D4 and one end of the control end of a relay K2, the cathode of the D4 is connected with +24V, the other end of the control end of the K2 is connected with +24V, and a K2 controlled switch is respectively connected with a connector J5 and DC 24V.