Multi-range on-site full-automatic pressure calibration instrument

• US 9,394,895 B2
• Filed: 07/22/2015
• Issued: 07/19/2016
• Est. Priority Date: 05/26/2011
• Status: Active Grant

• Current Assignee: Beijing Const Instrument Technology Inc.
• Original Assignee: Beijing Const Instrument Technology Inc.
• Inventors: Jiang, Weili
• Primary Examiner(s): Larkin, Daniel S
• Assistant Examiner(s): Ray, Jamar
• Application Number:
  US14/806,235
• Publication Number:
  US 20150323409A1
• Time in Patent Office: 363 Days
• US Class Current: 1/1
• CPC Class Codes: F04B 19/006 Micropumps F04B43/043 and F04B43/095 take precedence
• CPC Class Codes: F04B 35/04 the means being electric
• CPC Class Codes: F04B 39/00 Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
• CPC Class Codes: F04B 39/0005 adaptations of pistons
• CPC Class Codes: F04B 39/0094 crankshaft
• CPC Class Codes: F04B 51/00 Testing machines, pumps, or pumping installations
• CPC Class Codes: G01L 27/005 Apparatus for calibrating pressure sensors
• CPC Class Codes: G05D 16/208 using a combination of controlling means as defined in G05D16/2013 and G05D16/2066 G05D16/2073 takes precedence

Abstract

A multi-range on-site full-automatic pressure calibration instrument includes a housing, a power switch, a plurality of interfaces, a display, a keyboard, a gas pressure generation unit, a power supply unit, a pressure detection unit and a gas pressure control unit. The gas pressure generation unit is a gas pressurizing pump communicated with atmosphere. A pressure output port of the pressure control unit is in parallel connection with pressure connectors used for installation of a plurality of pressure standard devices with different ranges and a calibrated gauge. The pressure control unit is in signal connection with the pressure standard device. The power supply unit can supply power by batteries. The calibration instrument does not need to be externally connected with a gas cylinder or an alternating current power supply and can automatically generate a gas pressure and generate an accurate standard pressure.

Claims

1. A multi-range on-site full-automatic pressure calibration instrument, comprising:

a housing;

operation and control components including a power switch, a plurality of interfaces, a display and a keyboard incorporated at positions in the housing;

a gas pressure generation unit incorporated in the housing;

a power supply unit incorporated in the housing;

a pressure detection unit incorporated in the housing; and

a gas pressure control unit incorporated in the housing, wherein

the gas pressure generation unit is a gas pressurizing pump communicated with atmosphere, a pressure output pipe thereof being communicated with the gas pressure control unit;

a pressure output port of the pressure control unit is communicated in series with two parallel pressure connectors of the pressure control unit, one of the pressure connectors for installation of a gauge to be calibrated in the pressure detection unit and the other of the pressure connectors for installation of a pressure standard device in the pressure detection unit, the pressure standard device being a manually replaceable standard gauge from among a plurality of equipped standard gauges having different measurement ranges or being a plurality of switchable pressure modules having different measurement ranges;

the pressure control unit is in signal connection with the pressure standard device in the pressure detection unit, and the power supply unit is in electrical connection with the gas pressure generation unit, the pressure control unit, and the pressure standard device in the pressure detection unit, respectively.

2. The multi-range on-site full-automatic pressure calibration instrument of claim 1, wherein the pressure control unit comprises a pressure controller and a single-chip microcomputer system, wherein

a gas path portion of the pressure controller includes an intake valve, a buffer, a micro-pressure adjusting mechanism, an exhaust valve, and a standard pressure output port;

the standard pressure output port is provided with the two of the pressure connectors connected in parallel;

the intake valve is communicated with a high pressure gas output pipe of the gas pressurizing pump;

the buffer is a pressure accommodating chamber used to stabilize and preserve pressurized gas output by the intake valve, an outlet port of the buffer is communicated with a cylinder in the micro-pressure adjusting mechanism, and a plunger in the cylinder is connected with a screw mechanism;

the exhaust valve is installed in a pressure output pipe of the pressure controller and is communicated with the atmosphere to discharge gas pressure;

the standard pressure output port is installed in the pressure output pipe of the pressure controller in parallel with the exhaust valve;

a control portion of the pressure controller includes a pressure regulation driving circuit, which is in electrical connection with the power supply unit, and is in signal connection with the intake valve, the exhaust valve and the screw mechanism; and

the single-chip microcomputer system includes a control chip loaded with a pressure control algorithm, and is configured to form the plurality of interfaces;

the control chip is connected to the pressure regulation driving circuit, and controls the pressure output pipe of the pressure controller through the driving circuit to output a precise standard pressure.

3. The multi-range on-site full-automatic pressure calibration instrument of claim 2, wherein the pressure standard device is the plurality of switchable pressure modules having different measurement ranges, each communicated through a respective solenoid valve with one of the pressure connectors at the standard pressure output port of the pressure controller, the solenoid valve being controlled by the control chip through a valve switching circuit;

the single-chip microcomputer system further comprises a pressure module switching element, through which each of the pressure modules outputs data to the control chip via a digital communication interface.

4. The multi-range on-site full-automatic pressure calibration instrument of claim 3, wherein the plurality of interfaces provided in the single-chip microcomputer system are the digital communication interface connected to the pressure standard device, a display interface, a keyboard interface, and a RS232 interface connected to an external device.

5. The multi-range on-site full-automatic pressure calibration instrument of claim 2, wherein the plurality of interfaces provided in the single-chip microcomputer system are a digital communication interface connected to the pressure standard device, a display interface, a keyboard interface, and a RS232 interface connected to an external device.

6. The multi-range on-site full-automatic pressure calibration instrument of claim 2, wherein the gas pressurizing pump comprises a motor, an eccentric shaft, a swing rod, a pump body, a left cylinder body and a right cylinder body, a piston rod, and a plurality of one-way valve bodies and cylinder heads attached to each of the left and right cylinder bodies, wherein

the pump body is a connecting member, the motor is fixed to the pump body, and a motor shaft of the motor extends into the pump body and is connected with the eccentric shaft;

the eccentric shaft is of a cylindrical shape, and has at one end thereof a driving pin deviated from the axis of the eccentric shaft, with the driving pin extending through a mounting hole in the swing rod which is flat-shaped;

the swing rod is connected to the piston rod, which is horizontally disposed, through a screw;

the piston rod is of a cylindrical shape, opposite ends thereof being mounted with sealing rings, the opposite ends extending into the left and right cylinder bodies, respectively;

the left and right cylinder bodies are each of a cylindrical structure, and the left and right cylinder bodies are mounted at opposite ends of the pump body, respectively; and

each of the left and right cylinder bodies is sequentially provided at an outer end thereof with the one-way valve bodies and the cylinder heads, the one-way valve bodies being communicated with an inner cavity of the left and right cylinder bodies, and communicated with external air or compressed air lines through passages in the cylinder heads.

7. The multi-range on-site full-automatic pressure calibration instrument of claim 6, wherein

the piston rod forms sealing, through the sealing rings mounted at the opposite ends thereof, at an inner wall of the left and right cylinder bodies;

and

a swing motion of the swing rod drives the piston rod to reciprocate within the left and right cylinder bodies along the axis.

8. The multi-range on-site full-automatic pressure calibration instrument of claim 7, wherein the outer end of each of the left and right cylinder bodies is mounted with two reversely disposed ones of the one-way valve bodies, which are a part of the plurality of one-way valve bodies, such that one of the reversely disposed one-way valve bodies is communicated with the external air, and the other of the reversely disposed one-way valve bodies is communicated with the compressed air line.

9. The multi-range on-site full-automatic pressure calibration instrument of claim 8, wherein the plurality of one-way valve bodies are formed through assembly of a cavity seal body, an elastic arm, a metal pad, and a sealing ring, wherein the elastic arm extends inwardly from the cavity seal body and is coupled with a top end of the metal pad, and a bottom end of the metal pad is fixed with the sealing ring of the plurality of one-way valve bodies.

10. The multi-range on-site full-automatic pressure calibration instrument of claim 6, wherein the pressure standard device is the plurality of switchable pressure modules having different measurement ranges, each communicated through a respective solenoid valve with one of the pressure connectors at the standard pressure output port of the pressure controller, the solenoid valve being controlled by the control chip through a valve switching circuit;

the single-chip microcomputer system further comprises a pressure module switching element, through which each of the pressure modules outputs data to the control chip via a digital communication interface.

11. The multi-range on-site full-automatic pressure calibration instrument of claim 10, wherein the plurality of interfaces provided in the single-chip microcomputer system are the digital communication interface connected to the pressure standard device, a display interface, a keyboard interface, and a RS232 interface connected to an external device.

12. The multi-range on-site full-automatic pressure calibration instrument of claim 6, wherein the plurality of interfaces provided in the single-chip microcomputer system are a digital communication interface connected to the pressure standard device, a display interface, a keyboard interface, and a RS232 interface connected to an external device.

13. The multi-range on-site full-automatic pressure calibration instrument of claim 6, wherein the pressure standard device is a standard gauge, the standard gauge being a precision digital pressure gauge or a digital pressure calibrator.

14. The multi-range on-site full-automatic pressure calibration instrument of claim 2, wherein the pressure standard device is a standard gauge, the standard gauge being a precision digital pressure gauge or a digital pressure calibrator.

15. The multi-range on-site full-automatic pressure calibration instrument of claim 1, wherein the gas pressurizing pump comprises a motor, an eccentric shaft, a swing rod, a pump body, a left cylinder body and a right cylinder body, a piston rod, and a plurality of one-way valve bodies and cylinder heads attached to each of the left and right cylinder bodies, wherein

the pump body is a connecting member, the motor is fixed to the pump body, and a motor shaft of the motor extends into the pump body and is connected with the eccentric shaft;

the eccentric shaft is of a cylindrical shape, and has at one end thereof a driving pin deviated from the axis of the eccentric shaft, with the driving pin extending through a mounting hole in the flat shaped swing rod which is flat-shaped;

the swing rod is connected to the piston rod, which is horizontally disposed, through a screw;

the piston rod is of a cylindrical shape, opposite ends thereof being mounted with sealing rings, the opposite ends extending into the left and right cylinder bodies, respectively;

the left and right cylinder bodies are each of a cylindrical structure, and the left and right cylinder bodies are mounted at opposite ends of the pump body, respectively; and

each of the left and right cylinder bodies is sequentially provided at an outer end thereof with the one-way valve bodies and the cylinder heads, the one-way valve bodies being communicated with an inner cavity of the left and right cylinder bodies, and communicated with external air or compressed air lines through passages in the cylinder heads.

16. The multi-range on-site full-automatic pressure calibration instrument of claim 15, wherein

the piston rod forms sealing, through the sealing rings mounted at the opposite ends thereof, at an inner wall of the left and right cylinder bodies;

and

a swing motion of the swing rod drives the piston rod to reciprocate within the left and right cylinder bodies along the axis.

17. The multi-range on-site full-automatic pressure calibration instrument of claim 16, wherein the outer end of each of the left and right cylinder bodies is mounted with two reversely disposed one-way valve bodies, which are a part of the plurality of one-way valve bodies, such that one of the two reversely disposed one-way valve bodies is communicated with the external air, and the other of the two reversely disposed -one-way valve bodies is communicated with the compressed air line.

18. The multi-range on-site full-automatic pressure calibration instrument of claim 17, wherein the plurality of one-way valve bodies are formed through assembly of a cavity seal body, an elastic arm, a metal pad, and a sealing ring, wherein the elastic arm extends inwardly from the cavity seal body and is coupled with a top end of the metal pad, and a bottom end of the metal pad is fixed with the sealing ring of the plurality of one-way valve bodies.

19. The multi-range on-site full-automatic pressure calibration instrument of claim 15, wherein the pressure standard device is a standard gauge, the standard gauge being a precision digital pressure gauge or a digital pressure calibrator.

20. The multi-range on-site full-automatic pressure calibration instrument of claim 1, wherein the power supply unit is a system powered by an external power source, or a self-power system including a battery.