CN112304494A - Gas circuit assembly and gas pressure calibrator - Google Patents
Gas circuit assembly and gas pressure calibrator Download PDFInfo
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- CN112304494A CN112304494A CN201910674956.2A CN201910674956A CN112304494A CN 112304494 A CN112304494 A CN 112304494A CN 201910674956 A CN201910674956 A CN 201910674956A CN 112304494 A CN112304494 A CN 112304494A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L27/00—Testing or calibrating of apparatus for measuring fluid pressure
- G01L27/002—Calibrating, i.e. establishing true relation between transducer output value and value to be measured, zeroing, linearising or span error determination
- G01L27/005—Apparatus for calibrating pressure sensors
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D16/00—Control of fluid pressure
- G05D16/20—Control of fluid pressure characterised by the use of electric means
- G05D16/2006—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means
- G05D16/2013—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means using throttling means as controlling means
- G05D16/2022—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means using throttling means as controlling means actuated by a proportional solenoid
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- Fluid Mechanics (AREA)
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- Automation & Control Theory (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
The invention provides a gas circuit assembly and a gas pressure calibrator, wherein the calibrator comprises a shell, a gas circuit assembly and a circuit component which are assembled in the shell in a modularized manner, the gas circuit assembly comprises a gas pressure control mechanism and a micro gas pressure generating mechanism, the gas pressure control mechanism provides required pressure gas for a tested pressure instrument, and the calibrator comprises an interface module, a control execution module and a control module, wherein the interface module and the control execution module are communicated in a plugging manner; the micro gas pressure generating mechanism provides positive pressure gas and negative pressure gas for the gas pressure control mechanism and comprises a micro piston type gas pump used as the pressure source. The invention adopts a modular design, and each gas circuit component is assembled in a push-pull mode, so that the installation and the maintenance are convenient; the circuit components are installed in a plug-in mode, vertical space is fully utilized, and lightweight design is adopted, so that the integrated structure is compact, small in size and light in weight, and the integrated circuit is suitable for field calibration.
Description
Technical Field
The invention belongs to the technical field of gas pressure calibration, and particularly relates to a gas circuit assembly and a gas pressure calibrator.
Background
At present, in the field of gas pressure calibration, a portable gas pressure calibration instrument for on-site calibration of a pressure instrument to be tested is widely applied. In the existing gas pressure calibrator, a gas pressure control device for stabilizing standard pressure output is provided, valve seats are usually fixed on a fixed frame, and the valve seats are connected with gas circuits through connecting pipelines, so that the calibrator has no universality and is inconvenient to maintain and replace devices.
The interface part of the existing gas pressure control module is provided with a measuring component, different detection modules are required to be arranged for gas pressures with different measurement and precision, and then different interface parts are configured to be matched with the measuring component, so that the adaptability is poor, the cost is high, and the maintenance is difficult. The existing gas-liquid separation mode can only isolate impurities entering a pressure instrument to be detected, and cannot remove water vapor in input gas, so that the dehumidification function cannot be realized.
In a piston type air pump used in the existing gas pressure calibrator, a motor and a cylinder body are generally arranged in series, a piston as a wear part is often required to be replaced, the motor and the cylinder body are required to be integrally removed during replacement, and the replacement is difficult; the existing air pump does not comprise a vibration reduction system, and is generally fixed with a detection system body through an additional vibration reduction pad, when the pressure output of the air pump is low pressure, the hose is generally adopted to output low-pressure air, so that the vibration of the air pump can be effectively isolated; however, if high pressure is output, high pressure gas must be output by using steel pipes to ensure safety, the steel pipes are rigidly connected, and the vibration of the pump body of the air pump is transmitted to the body of the detection system through the steel pipes, so that the vibration reduction system fails. The pressure generating device (providing a pressure air source) serving as a pressure calibrator has the defect that the detection precision of the sensor is influenced by large vibration; meanwhile, in order to meet the use requirements of portable equipment, the volume and the weight of the gas pressure generating device meet the miniaturization requirements as much as possible, and the existing gas pressure generating device cannot meet the requirements.
Disclosure of Invention
The invention provides a gas circuit component which adopts a modular design, and is simple in structure and convenient to maintain.
The invention adopts the following technical scheme:
an air path assembly for a pressure check gauge, the air path assembly comprising:
the gas pressure control mechanism (100) comprises an interface module (01), a control execution module (02) and a control module (03) for controlling the interface module (01) and the control execution module (02), wherein the interface module (01) is communicated with the control execution module (02) through a gas path;
the micro gas pressure generating mechanism (04) is used for providing a gas source for the gas pressure control mechanism (100);
the control execution module (02) responds to a control instruction of the control module (03), controls a gas source provided by the micro gas pressure generating mechanism (04) to a target pressure value, and transmits the gas at the target pressure value to the interface module (01) through a gas path;
the interface module (01) responds to an output instruction of the control module (03) and outputs the gas with the target pressure value.
In the gas circuit assembly, the micro gas pressure generating mechanism (04) comprises a micro piston type gas pump, a vibration reduction supporting base (401), an interface unit (405) and a gas connecting pipeline (404) for communicating the micro piston type gas pump with the interface unit, wherein the vibration reduction supporting base (401) comprises an upper supporting plate (411), a lower supporting plate (412), a plurality of elastic supporting pieces (414) for connecting the peripheries of the upper supporting plate and the lower supporting plate and a central vibration absorber (413) arranged between the upper supporting plate and the lower supporting plate, the plurality of elastic supporting pieces (414) are arranged at intervals in the circumferential direction of the upper supporting plate and the lower supporting plate, and the central vibration absorber (413) is arranged in the middle of the upper supporting plate (411) to limit the upper limit position and the lower limit position of the vibration.
In the above air passage assembly, the central vibration absorber (413) includes:
the limiting sleeve (4131) is of a hollow sleeve structure, the cylinder wall at the opening of the upper end of the limiting sleeve extends inwards to form an inwards-contracted closing-in, the bottom of the limiting sleeve extends outwards to form an outer step, and the bottom of the outer step is tightly attached and fixed with the lower supporting plate (12);
the limiting column (4132) is of an inverted T-shaped structure and comprises a horizontal plate and a vertical column, the upper part of the vertical column is fixed on the upper supporting plate (411), the lower part of the vertical column extends into the limiting sleeve (4131), and the diameter of the horizontal plate is larger than that of the upper part closing-in of the limiting sleeve (4131); and
and the elastic damping element (4133) is sleeved on the vertical column of the limiting column (4132) and limited between the upper supporting plate (411) and the horizontal plate of the limiting column (4132).
In the air path assembly, the elastic support piece (414) is of a double-spiral reverse spring structure and comprises double spiral springs (4141) which are reversely arranged, the lower parts of the double spiral springs (4141) are connected, the connected parts form arc-shaped grooves (4143), the upper parts are separated to form interfaces (4142), and bent parts (4144) are arranged at the end parts of the interfaces.
Among the above-mentioned gas circuit subassembly, miniature piston air pump installs on damping supports the base, includes:
a cylinder-piston unit (403) comprising a cylinder (31) and a piston assembly (432) located within the cylinder; and
the transmission driving unit (402) comprises a motor (421), a synchronous belt speed reducing mechanism (422) and a crank block mechanism, wherein the synchronous belt speed reducing mechanism (422) is matched with the crank block mechanism to convert the rotary motion output by the motor (421) into the linear motion for driving the piston assembly (432) to reciprocate in the cylinder body (431);
the motor (421) and the cylinder (431) are installed on the upper supporting plate (411) of the vibration damping supporting base (401), and the motor (421) is positioned on one side of the cylinder (431) to form a stable triangular structure.
In the gas circuit assembly, the interface unit (405) is arranged on a lower support plate (412) of the vibration reduction support base (401), and a gas connecting pipeline (404) for connecting a high-pressure gas outlet of the micro piston type air pump and a gas output interface (452) is a high-pressure elastic pipeline (442) which is made of a thin stainless steel pipe bent into a spiral spring shape.
In the gas circuit assembly, the control module (03) comprises a control circuit board (031), the control circuit board (031) is connected in series with a solenoid valve in a gas circuit of the control execution module (02) in a control mode to be powered on or powered off so as to control pressure gas input by the micro gas pressure generating mechanism (04) to flow in order in the gas circuit of the control execution module (02), and then the pressure gas is controlled to be at a preset pressure value and is output from the interface module (01), wherein the interface module (1) comprises a fixed supporting unit (1) internally provided with a gas pipeline system (2), and a gas input pipeline (25) of the gas pipeline system (2) is communicated with a gas output pipeline (26) through a spiral dehumidifying and filtering unit (5);
the spiral dehumidifying filter unit (5) comprises:
the liquid storage cylinder (51) is arranged on the fixed supporting unit (1), and a spiral groove (511) is formed in the inner wall of the liquid storage cylinder and extends upwards from the bottom;
the bottom of the central breather pipe (52) is communicated with the gas input pipeline (25), and the top of the central breather pipe penetrates through the bottom of the liquid storage cylinder (51) and extends to the upper part of the liquid storage cylinder; and
the middle part of the isolating umbrella (53) is hermetically buckled with the upper end of the central vent pipe (52), one side of the isolating umbrella is provided with a lateral through hole (531) communicated with the central vent pipe (52), and a gap is arranged between the umbrella-shaped edge of the isolating umbrella (53) and the inner wall of the liquid storage cylinder (51).
In the gas path assembly, the gas output pipeline (26) is arranged on one side of the lower part of the liquid storage cylinder (51) and is communicated with the inside of the liquid storage cylinder; one end of a liquid drainage pipeline (24) in the gas pipeline system (2) is arranged at the bottom of the liquid storage cylinder (51) and communicated with the inside of the liquid storage cylinder, the other end of the liquid drainage pipeline is communicated with the atmosphere, and a liquid drainage electromagnetic valve (4) is connected on the liquid drainage pipeline (24) in series.
In the gas circuit assembly, the interface module (01) further comprises one or more measuring assemblies (3), the measuring assemblies (3) are used as gas pressure measuring units and are mounted on the side face of the fixed supporting unit (1) and exposed, and the measuring assemblies (3) are electrically connected to the control circuit board (031).
In the gas circuit component, two measuring components (3) are arranged, and each measuring component comprises a high-pressure measuring component (31) and a low-pressure measuring component (32), wherein the high-pressure measuring component (31) is communicated with the gas input pipeline (25) through a high-pressure measuring pipeline (22); the low-pressure measuring assembly (32) is communicated with the gas input pipeline (25) through a low-pressure measuring pipeline (23), and the low-pressure measuring pipeline (23) is connected with a high-pressure and low-pressure switching valve (7) in series so as to control the on-off of the low-pressure measuring assembly (32) and the gas input pipeline (25).
In the gas circuit component, the control execution module (02) is provided with a valve seat (7), the valve seat (7) comprises a gas capacity cavity (71) provided with a positive pressure gas capacity (711), a negative pressure gas capacity (712) and a positive and negative pressure output pipeline (84), a positive pressure valve seat (72) internally provided with a positive pressure gas distribution pipeline (81) and a negative pressure valve seat (73) internally provided with a negative pressure gas distribution pipeline (82), the positive pressure gas capacity (711) is communicated with an output port of the micro gas pressure generating mechanism (04) through the positive pressure gas distribution pipeline (81) and is communicated with a gas input channel (25) of the interface module (01) through the positive and negative pressure output pipeline (84), the negative pressure air volume (712) is communicated with the input port of the micro gas pressure generating mechanism (04) through a negative pressure air distribution pipeline (82) and is communicated with the gas input channel (25) of the interface module (01) through a positive pressure output pipeline (84).
In the air path assembly, the positive pressure air distribution pipeline (81) is communicated with the positive pressure air container (711) through a second electromagnetic valve (V2) and is communicated with a liquid discharge pipeline (24) arranged in the interface module (01) through a first electromagnetic valve (V1); the negative pressure air distribution pipeline (82) is communicated with the negative pressure air capacitor (712) through a fourth electromagnetic valve (V4), the fourth electromagnetic valve (V4) is a three-way electromagnetic valve, a normally closed channel of the three-way electromagnetic valve is connected in series with the negative pressure air distribution pipeline (82), and a normally open channel of the three-way electromagnetic valve is communicated with the atmosphere through an air inlet (94) formed in the bottom of a negative pressure valve seat (73).
In the air path assembly, the positive and negative pressure output pipeline (84) is communicated with the positive pressure air capacitor (711) through a third electromagnetic valve (V3) and is communicated with the negative pressure air capacitor (712) sequentially through a sixth electromagnetic valve (V6) and a fifth electromagnetic valve (V5), the fifth electromagnetic valve (V5) is a three-way electromagnetic valve, a normally closed channel of the three-way electromagnetic valve is connected between the negative pressure air capacitor (712) and the positive and negative pressure output pipeline (84) in series, and the normally open channel is connected into and arranged in the liquid drainage pipeline (24) in the interface module (01).
In the above-mentioned gas circuit subassembly, the three-way solenoid valve includes:
an electromagnetic coil (601);
a sleeve (602) fixedly disposed within the battery coil (601);
a fixed iron core (603) fixedly sleeved in the sleeve (602);
the movable iron core (604) is movably sleeved in the sleeve and positioned below the fixed iron core, the upper end of the movable iron core is provided with a blind hole (641) for accommodating the first spring (605), and the first spring (605) is always in a compressed state; and
the first sealing element (607) and the second sealing element (611) are connected to form a sealing element with an internal invariable cavity, and the sealing element is clamped at the lower end of the sleeve (602);
a matching structure formed by a sealing gasket (616) and a valve core (614) provided with a second spring is arranged in the invariable cavity of the sealing member, and the matching structure can move in the same direction along with the movement of the movable iron core (604), so that a lateral second pressure port (610) arranged on the first sealing member (607) is communicated with one of a first pressure port (609) arranged at the upper bottom of the first sealing member (607) and a third pressure port (613) arranged on the second sealing member (611).
In the gas circuit assembly, the control execution module (02) further comprises a pressure sensor assembly (10) serving as a gas pressure measurement unit, the pressure sensor assembly (10) is electrically connected to the control circuit board (031), and the detection probe of the pressure sensor assembly extends into the gas capacity cavity (71) to sense the gas pressure value in the gas capacity cavity.
The present invention also provides a gas pressure calibrator, comprising:
a housing (500);
the air channel assembly is arranged in the shell (500);
a touch display screen (400) for displaying, measuring and inputting operations;
an electrical measurement assembly (600); and
an interface board (300) for accessing a power module (700).
In the gas pressure calibrator, the shell (500) comprises a lower shell (510), an upper shell (520) and a flip (530), and a rectangular through groove is formed in the top of the upper shell (520); the turnover cover (530) can rotatably cover the rectangular through groove of the upper shell (520), and the upper shell (520), the lower shell (510) and the turnover cover (530) are buckled to form a cavity structure; a mounting rack (08) is arranged in the inner space of the cavity, the air channel assembly and the circuit component are assembled in the mounting rack (08), and the power supply module (700) is detachably mounted at the bottom of the lower shell (510).
In the gas pressure calibrator, an isolation hood (084) is arranged inside a mounting rack (08), the isolation hood (084) and a first side plate (082) and a second side plate (083) on two sides of the mounting rack divide the inside of the mounting rack (08) into two areas, namely a first mounting area (085) and a second mounting area (086), a first guide rail groove (0851) and a second guide rail groove (0861) are respectively arranged at the bottoms of the first mounting area (085) and the second mounting area (086), and a gas circuit connecting seat (088) is arranged at the rear end of the mounting rack (08); the gas pressure control mechanism (100) is pushed into the first mounting area (085) along the first guide rail groove (0851), the miniature gas pressure generating mechanism (04) is pushed into the second mounting area (086) along the second guide rail groove (0861), the isolation cover (084) wraps the miniature gas pressure mechanism (04), and interfaces of the gas pressure control mechanism (100) and the miniature gas pressure generating mechanism (04) are connected with corresponding gas circuit connecting holes arranged on the gas circuit connecting base in an inserting mode.
In the gas pressure calibrator, two ends of the bottom of the lower shell (510) are respectively provided with an exhaust port (5101) and a wind shield (5102) for exhausting hot gas in a cavity, an air suction port (5103) for sucking cold air, an air path exhaust groove (5104) and a filter (5105), the cold air is sucked from the air suction port (5103), one part of the cold air sequentially enters the micro gas pressure generating mechanism (04) through the air path exhaust groove (5104) and the filter (5105), the other part of the cold air flows and rises to enter from a cold air hole (0841) of an isolation cover (084) in the shell to cool the micro gas pressure generating mechanism (04), the generated hot gas is exhausted from an exhaust fan (0862) arranged on an installation rack (08), and the exhaust fan (0862) corresponds to the exhaust port (5103).
In the gas pressure calibrator, the flip cover (530) is hinged to one side of the top of the mounting rack (08) through a damping shaft, the flip cover can rotate and be held around the damping shaft, and the touch display screen (400) is mounted on the inner side of the flip cover (530); the periphery of the lower shell (510) is provided with an elastic anti-collision bulge (5106).
Due to the adoption of the design, the invention has the following characteristics:
the gas pressure calibrator adopts a modular design, and each gas circuit component is assembled in a push-pull mode, so that complicated gas circuit wiring connection is omitted, and the gas pressure calibrator is convenient to install and maintain; the design and installation of the circuit components adopt a plug-in mode, the vertical space is fully utilized, and meanwhile, the lightweight design is assisted, so that the whole structure is compact, the volume is small, the weight is light, and the device is suitable for field calibration;
the appropriate interface module can be replaced according to the measuring range and the accuracy of the detected pressure instrument, or the high-low pressure switching valve is controlled to switch among different measuring assemblies, so that the adaptability is good, and the detection accuracy is ensured; adopting a spiral dehumidifying and filtering unit to dehumidify and filter the input or output pressure gas so as to form clean and dry pressure gas and prevent residual liquid in the detected pressure instrument from entering the detecting instrument through the interface device; the miniature gas pressure generating mechanism with the vibration reduction structure is adopted, the mechanism realizes the output of gas pressure under the condition of avoiding the influence of vibration on other components, and has the advantages of simple structure, small volume and light weight.
Drawings
FIG. 1A is an overall external view of the gas pressure tester of the present invention;
FIG. 1B is a block diagram of the gas pressure calibrator of the present invention;
FIG. 1C is a first exploded view of the gas pressure calibrator of the present invention;
FIG. 1D is a second exploded view of the gas pressure calibrator of the present invention;
FIG. 1E is a schematic view of the construction of the lower shell of the housing;
FIG. 2A is an exploded view of the gas pressure control mechanism;
FIG. 2B is a first schematic perspective view of the control execution module;
FIG. 2C is a schematic perspective view of a control execution module;
FIG. 2D is a block diagram of the gas path connections of the control execution module;
fig. 3A is a schematic perspective view of an interface module;
fig. 3B is a schematic perspective view of an interface module;
FIG. 3C is a longitudinal cut-away view of the interface module;
FIG. 3D is a schematic diagram of the gas path connection of the high and low pressure switching valves in the interface module;
FIG. 3E is a gas path connection block diagram of the interface module;
FIG. 3F is a schematic diagram of an embodiment of a spiral dehumidification filter unit;
FIG. 4 is an exploded view of the control module;
FIG. 5A is a schematic perspective view of a micro gas pressure generating device according to the present invention;
FIG. 5B is a schematic perspective view of a micro gas pressure generating device according to the present invention;
FIG. 5C is a schematic diagram of a particular embodiment of a cylinder-piston unit;
FIG. 5D is a partial structural cutaway view of the vibration damping support base;
FIG. 5E is a schematic structural view of one embodiment of a resilient support;
FIG. 5F is a schematic structural view of one embodiment of an elastic damping element;
FIG. 6A is a schematic cross-sectional view of an embodiment of a two-position, two-way solenoid valve according to the present invention;
FIG. 6B is a schematic diagram of one embodiment of a first seal;
FIG. 6C is a schematic cross-sectional view of an embodiment of a two-position, three-way solenoid valve according to the present invention;
FIG. 6D is a schematic diagram of an assembly relationship between a two-position three-way solenoid valve and a gas path pipeline;
FIG. 7A is a schematic structural view of a mounting bracket;
FIG. 7B is a first schematic view of the mounting frame, a portion of the air channel assembly, and the circuit components;
FIG. 7C is a second schematic view of the assembly relationship between the mounting frame and a portion of the air path assembly and the circuit components;
fig. 8 is an exploded view of the electrical measurement assembly.
The main labels are as follows:
100-gas pressure control mechanism;
01-an interface module; 02-control execution module; 03-control module, 04-micro gas pressure generating mechanism;
08-a mounting frame;
081-square frame body;
082-first side plate, 0821-output joint, 0822-drainage joint;
083-second side plate, 0831-net port, 0832-USB port, 0833-power interface;
084-isolation cover, 0841-cold air hole, 0842-wire clamping groove;
085-a first mounting area, 0851-a first guide rail channel;
086-a second mounting area, 0861-a second guide rail groove, 0862-an exhaust fan;
087-mounting groove;
088-an air path connecting seat, 0881-a liquid discharging hole, 0882-an air distribution connecting hole, 0883-an output hole and 0884-a pressing mechanism connecting hole;
200-system board, 210-second connector, 220-third connector, 230-fourth connector;
300-interface board, 310-first connector;
400-touch display screen;
500-shell, 510-lower shell, 5101-air outlet, 5102-air baffle, 5103-air inlet, 5104-air channel exhaust groove, 5105-filter and 5106-anti-collision protrusion; 520-upper case, 530-flip;
600-electrical measurement component, 610-measurement board, 620-key, 630-electrical measurement interface;
700-power supply module.
Detailed Description
The following describes the gas circuit assembly and the gas pressure calibrator in detail with reference to the specific embodiments and the accompanying drawings.
The gas pressure calibrator of the present invention adopts a modular design, and as shown in fig. 1A to 1D, the calibrator includes a housing 500, and a gas circuit assembly, a circuit component and a power module 700 installed outside the housing, which are integrally assembled in the housing. The gas circuit assembly comprises an interface module 01, a control execution module 02 and a micro gas pressure generating mechanism 04, the circuit components comprise a touch display screen 400, a system board 200, an interface board 300, a control circuit board 031 in the control module 03 and an electric measuring assembly 600, and electric signals of the gas circuit assembly are accessed to the system board 200 through other circuit components. The components are described in detail below with reference to the attached drawing figures:
The housing 500 of the gas pressure calibrator of the present invention is made of an elastic material (e.g., an elastic rubber material), and the outer circumference of the housing 500 has an anti-slip design, so that the housing is suitable for transportation.
The structure of the housing 500 is as shown in fig. 1A, the housing 500 includes a lower housing 510, an upper housing 520 and a flip cover 530, and a rectangular through slot is formed at the top of the upper housing 520; the flip 530 covers the rectangular through groove of the upper case 520, and the upper case 520, the lower case 510 and the flip 530 are fastened to form a cavity structure.
As shown in fig. 1C and 1D, a mounting rack 08 is disposed in the inner space of the cavity, and the gas pressure control mechanism 100, the micro gas pressure generating mechanism 04, and the circuit board 200 are assembled in the mounting rack 08; the gas pressure control mechanism 100 comprises an interface module 01, a control execution module 02 and a control module 03; the touch display screen 300 is arranged on the flip 530, and the electric measurement component 600 is arranged at the rectangular through groove.
The flip 530 is hinged to one side of the top of the mounting rack 08 through a damping shaft, and can rotate and be held within 180 degrees around the damping shaft, and the touch display screen 400 is mounted inside the flip 530; the battery module 700 is mounted at the bottom outside of the lower case 510.
Referring to fig. 1E, the lower case 510 is a square box as a whole, and studs are provided at four corners of the bottom thereof for mounting the mounting frame 08; the two ends of the bottom of the lower shell 510 are respectively provided with an exhaust port 5101 and a wind shield 5102 for exhausting hot air in the cavity, an air suction port 5103 for sucking cold air, an air passage exhaust groove 5104 and a filter 5105, and the exhaust port 5101 is limited in a limited space by the wind shield 5102, so that the effect of exhausting hot air is reduced due to the fact that air is prevented from diffusing in the shell; cold air is sucked from the air suction port 5103, a part of the cold air sequentially enters the air inlet 94 (see fig. 2C) in the control execution module 02 through the air passage exhaust channel 5104 and the filter 5105, the other part of the cold air flows upwards and enters the micro gas pressure generating mechanism 04 from the cold air hole 0841 of the isolation cover 084 in the shell to be cooled, generated hot air is discharged from the exhaust fan 0862 arranged on the mounting frame 08, and the exhaust fan 0862 corresponds to the air exhaust port 5103 (see fig. 7A); the bottom outside of the lower case 510 is provided with a rectangular groove for mounting the battery module 700, and the battery module 700 is packaged in the rectangular groove by an end cap, which is fastened and/or screwed to the bottom of the lower case. Preferably, the outer wall of the lower case 510 is provided with elastic collision-preventing protrusions 5106 around the outer wall thereof for buffering vibration damage to components inside the case due to collision. The side walls of the two ends of the lower shell 510 are respectively provided with a plurality of through holes for installing and exposing an output joint 0821 and a drainage joint 0822 of the check meter, a net opening 0831, a USB opening 0832 and a power supply interface 0833.
The upper shell 520 is a square end cover as a whole, and a rectangular through groove is formed in the middle of the upper shell and used for exposing the key 620 and the electrical testing interface 630 of the electrical testing assembly 600; the flip 530 is in a rectangular plate shape, the touch display screen 400 is embedded in the groove on the inner side, the flip 530 is rotatably hinged to the mounting frame 08 and exposed through the rectangular through groove of the upper shell 520, and the touch display screen 400 can be sealed in the shell along with the flip 530 covering the rectangular through groove of the upper shell 520 and can also be kept at any angle within the turning range along with the flip 530 turning. The touch screen 400 may be composed of a stacked touch screen and a liquid crystal display, and may be used for both display and manual touch operation.
The installation of each part of the shell 500 adopts a sealing matching mode (for example, a sealing ring, a sealing gasket and the like are arranged), so that the gas pressure calibrator has good waterproof and dustproof sealing performance.
The gas pressure check meter using directions shown in fig. 1A in the specification define up, down, left, right, front, rear, inside and outside. The pneumatic connections of the pneumatic circuit assembly and the electrical connections of the circuit components within the housing 500, as well as the structure and assembly of the various components, are described in detail below.
Gas pressure control mechanism 100
Fig. 2A is a schematic structural diagram of a gas pressure control mechanism 100, where the gas pressure control mechanism 100 is mounted on a mounting rack 08 in a housing 500, and is mainly used for providing a required gas pressure for a detected pressure instrument, and the gas pressure control mechanism adopts a modular design, and includes an interface module 01, a control execution module 02 and a control module 03, where the interface module 01 and the control execution module 02 are electrically connected to the control module 03, and the interface module 01 and the control execution module 02 are connected to each other by a gas circuit in an insertion manner, where:
Main reference numerals of the control execution module 02:
02-control execution module;
7-valve seat, 71-air volume cavity, 711-positive pressure air volume and 712-negative pressure air volume; 72-positive pressure valve seat, 73-negative pressure valve seat, 74-elastic spacer;
8-an air passage, 81-a positive pressure air distribution pipeline, 82-a negative pressure air distribution pipeline, 83-an exhaust emission pipeline and 84-a positive and negative pressure output pipeline;
9-gas path interface, 91-positive pressure input interface, 92-negative pressure input interface, 93-positive and negative pressure output interface, 94-gas inlet, 95-waste gas output interface;
10-pressure sensor assembly, 101-electrical connection line;
the electromagnetic valve group comprises a V-electromagnetic valve group, a V1-first electromagnetic valve, a V2-second electromagnetic valve, a V3-third electromagnetic valve, a V4-fourth electromagnetic valve, a V5-fifth electromagnetic valve and a V6-sixth electromagnetic valve.
The control execution module 02 is mainly used for executing the control command of the control module 03, and realizes accurate control of the pressure of the output gas through controlling the electromagnetic valves connected in series on the gas circuit. Referring to fig. 2A to 2D, the control execution module 02 includes a valve seat 7, an air passage channel 8 disposed in the valve seat 7, a solenoid valve group V connected in series on the air passage channel 8, a pressure sensor 10 for detecting gas pressure, and an air passage interface 9 for connecting with an external air passage, wherein:
in this embodiment, the valve seat 7 includes a gas container cavity 71, a positive pressure valve seat 72 and a negative pressure valve seat 73, a positive pressure gas container 711 for buffering positive pressure gas and a negative pressure gas container 712 for buffering negative pressure gas are provided in the gas container cavity 71, and the positive pressure gas container 711 and the negative pressure gas container 712 are independent from each other; the positive pressure valve seat 72 and the negative pressure valve seat 73 are provided with transverse grooves to realize the connection of air passage channels in the two valve seats, and the joint of the two valve seats is provided with an elastic spacer 74 to realize the air passage sealing between the two valve seats and the plugging of a fabrication hole; the two valve seats are connected together through the pressing sheet and the screw in a matching mode and used for arranging an air path channel and installing an electromagnetic valve group V for controlling the on-off of the air path.
The present invention is not limited to the arrangement of the air passage 8 in the valve seat 7 and the specific structure and mounting position of each solenoid valve in the solenoid valve group V, and will be described as an exemplary embodiment.
Referring to fig. 2D, the air path channel 8 includes a positive pressure air distribution pipeline 81, a negative pressure air distribution pipeline 82, a waste gas discharge pipeline 83, and a positive and negative pressure output pipeline 84, and the air path interface 9 is disposed on the valve seat 7 and includes a positive pressure input interface 91, a negative pressure input interface 92, a positive and negative pressure output interface 93, an air inlet 94, and a waste gas output interface 95. As shown in fig. 2B, the positive pressure air distribution pipeline 81 is disposed in the positive pressure valve seat 72, the positive pressure input port 91 is disposed at an end of the positive pressure valve seat 72, the positive pressure input port 91 is communicated with the positive pressure air volume 711 through the positive pressure air distribution pipeline 81, and the second electromagnetic valve V2 in the electromagnetic valve group V is a two-way normally closed electromagnetic valve and is connected in series to the positive pressure air distribution pipeline 81; referring to fig. 2C, the negative pressure air distribution pipeline 82 is disposed in the negative pressure valve seat 73, the negative pressure input interface 92 is disposed at an end of the negative pressure valve seat 73, the negative pressure input interface 92 is communicated with the negative pressure air volume 712 through the negative pressure air distribution pipeline 82, the fourth electromagnetic valve V4 in the electromagnetic valve group V is a three-way electromagnetic valve, a normally closed channel thereof is connected in series to the negative pressure air distribution pipeline 82, and a normally open channel thereof is communicated with the atmosphere through an air inlet 94 disposed at the bottom of the negative pressure valve seat 73.
The positive and negative pressure output pipeline 84 is arranged in the air volume cavity 71, and a third electromagnetic valve V3 in the electromagnetic valve group V is a two-way normally closed electromagnetic valve, and is connected in series between the positive pressure air volume 711 and the positive and negative pressure output channel 84, and is used for controlling the on-off between the positive pressure air volume 711 and the positive and negative pressure output channel 84. The negative pressure air volume 712 is communicated with the positive and negative pressure output pipeline 84 through a fifth electromagnetic valve V5 and a sixth electromagnetic valve V6 in the electromagnetic valve group V in sequence, wherein the sixth electromagnetic valve V6 is a two-way normally closed electromagnetic valve, the fifth electromagnetic valve V5 is a three-way electromagnetic valve, a normally closed channel of the fifth electromagnetic valve V5 is connected in series between the negative pressure air volume 712 and the positive and negative pressure output pipeline 84, and a normally open channel is connected to the waste gas discharge pipeline 83. The exhaust gas discharge pipeline 83 crosses the positive pressure valve seat 72, the negative pressure valve seat 73 and the elastic spacer 74, a first electromagnetic valve V1 in the electromagnetic valve group V is a two-way normally closed electromagnetic valve and is connected in series between the exhaust gas discharge pipeline 83 and the positive pressure gas distribution pipeline 81, a normally open channel of a fifth electromagnetic valve V5 is connected in series between the negative pressure gas distribution pipeline 82 and the exhaust gas discharge pipeline 83, and the exhaust gas is connected into the exhaust gas inlet 64 in the interface module 01 from the exhaust gas output interface 95 through the exhaust gas discharge pipeline 83.
In order to realize accurate control of the gas pressure in the gas container cavity 71, the positive pressure gas container 711 and the negative pressure gas container 712 are correspondingly provided with the pressure sensor assembly 10, and the detection probes of the pressure sensor assembly 10 respectively extend into the cavities of the positive pressure gas container 711 and the negative pressure gas container 712 for accurately sensing the gas pressure in the cavities. The pressure signal of the pressure sensor assembly 10 is led out through an electrical connection line 101 to the control module 03. Preferably, a flat wire is used as the lead-out of the electric connection wire 101, so that the operation is convenient and the work is reliable.
The control execution module 02 of the invention can simultaneously buffer positive pressure gas and negative pressure gas by arranging the positive pressure gas container 711 and the negative pressure gas container 712, can simultaneously play a buffer role as a gas source, and can precisely control the gas pressure by matching the power-on or power-off operation of the electromagnetic valve in the electromagnetic valve group V, thereby preventing the accessed micro gas pressure generating mechanism 04 from being frequently started.
Main reference numerals of the interface module 01:
1-fixed supporting unit, 11-base, 12-measuring component seat, 13-supporting plate, 14-interface mounting seat;
2-a gas pipeline system, 21-a gas main pipeline, 22-a high-pressure measuring pipeline, 23-a low-pressure measuring pipeline, 24-a liquid drainage pipeline, 25-a gas input pipeline and 26-a gas output pipeline;
3-measuring component, 31-high voltage measuring component, 32-low voltage measuring component;
41-a liquid discharge electromagnetic valve and 42-a high-low pressure switching valve;
5-spiral dehumidification filtering unit, 51-liquid storage cylinder, 511-spiral groove, 52-central vent pipe, 53-isolating umbrella, 531-lateral through hole;
6-interface unit, 61-input interface, 62-output interface, 63-liquid discharge port and 64-waste gas inlet.
The interface module 01 is mainly used for detecting the gas pressure input by the control execution module 02, and provides a gas output interface for inputting the pressure gas to the detected pressure instrument, so as to realize the detection of the detected pressure instrument. Referring to fig. 3A to 3E, the interface module 01 includes a fixed supporting unit 1 in which a gas piping system 2 is disposed, and a measuring assembly 3, a spiral dehumidifying filter unit 5, and an interface unit 6 which are installed and disposed on the fixed supporting unit 1, wherein:
referring to fig. 3A and 3B, in this embodiment, the fixed supporting unit 1 includes a base 11, a measuring component seat 12, a supporting plate 13, and an interface mounting seat 14, the spiral dehumidifying filter unit 5 is fixed on the base 11, the measuring component 3 is mounted on the side of the measuring component seat 12, and the interface unit 6 is disposed on the base 11 and the interface mounting seat 14; the supporting plate 13 is located at the joint of the bottom of the base 11 and the bottom of the measuring component seat 12, and the base and the measuring component seat are connected into a whole through a screw fixing mode or a welding mode.
As shown in fig. 3C and fig. 3E, the gas pipeline system 2 is disposed in the fixed supporting unit 1, and includes a main gas pipeline 21 horizontally penetrating through the base 11 and the measuring component seat 12, a high-pressure measuring pipeline 22 and a low-pressure measuring pipeline 23 disposed on the measuring component seat 12, a liquid discharge pipeline 24 disposed independently of the main gas pipeline 21, a gas input pipeline 25 and a gas output pipeline 26, the gas input pipeline 25 is communicated with the main gas pipeline 21, the gas output pipeline 26 is communicated with the main gas pipeline 21 through the spiral dehumidifying and filtering unit 5, external pressure gas enters the spiral dehumidifying and filtering unit 5 through the main gas pipeline 21, and is output from the gas output pipeline 26 after dehumidifying and filtering; the liquid discharge pipeline 24 is communicated with the spiral dehumidifying and filtering unit 5, and liquid and impurities separated by the spiral dehumidifying and filtering unit 5 are discharged through the liquid discharge pipeline 24. The measuring component 3, the spiral dehumidifying and filtering unit 5 and the interface unit 6 of the interface module of the present invention form a gas circuit connection through each gas pipeline of the gas pipeline system 2, and for a specific connection condition, please refer to the following description.
Referring to fig. 3A and 3B, the interface unit 6 includes an input interface 61, an output interface 62, a liquid discharge port 63, and an exhaust gas inlet port 64, the input interface 61 is disposed on the base 11 and communicated with the gas input duct 25, and the output interface 62 is disposed on the interface mounting seat 14 and communicated with the gas output duct 26; the liquid discharge port 63 and the waste gas inlet 64 are arranged on the side surface of the base 11 and are respectively communicated with the liquid discharge pipeline 24, the liquid discharge pipeline 24 is connected with the liquid discharge electromagnetic valve 4 in series, and the on-off of the liquid discharge channel 24 is controlled by the liquid discharge electromagnetic valve 4, so that the working time sequence of the device is controlled.
Referring to fig. 3B and 3D, in this embodiment, the measuring assembly 3 is provided with two, respectively, a high-pressure measuring assembly 31 and a low-pressure measuring assembly 32, which are mounted on the side of the measuring assembly base 12, and are preferably fixed to the measuring assembly base 12 by non-removable screws; the measuring component 3 is exposed outside the fixed supporting unit 1, and measuring components with different measuring ranges and precision can be replaced conveniently according to detection requirements. The high-pressure measuring component 31 and the low-pressure measuring component 32 can be selected from detection module models commonly used in the market, the high-pressure measuring component and the low-pressure measuring component have different detection ranges and detection accuracies, and generally, the gas pressure detection range of the low-pressure measuring component 32 is small, and the detection accuracy is high. The high-pressure measuring component 31 is provided with a high-pressure measuring port which is communicated with the gas main pipeline 21 through a high-pressure measuring pipeline 22; the low pressure measuring assembly 32 is provided with a low pressure measuring port which is communicated with the gas main pipeline 21 through a low pressure measuring pipeline 23, and the low pressure measuring pipeline 23 is connected with a high-low pressure switching valve 42 in series for controlling the on-off of the low pressure measuring port and the gas main pipeline 21.
Preferably, the high-low pressure switching valve 42 and the drain solenoid valve 4 are both two-position two-way solenoid valves (normally closed type), and have two operating states, i.e., energized and de-energized. The two-position two-way electromagnetic valve can be an existing two-position two-way electromagnetic valve and can achieve the purpose of the invention.
The spiral dehumidifying and filtering unit 5 is used for dehumidifying and filtering the input pressure gas to form clean and dry pressure gas and prevent the liquid remaining in the tested pressure instrument from entering the gas pressure control mechanism 100 through the interface module. Referring to fig. 3F, the spiral dehumidifying filter unit 5 includes a liquid storage cylinder 51 and a central vent pipe 52, the liquid storage cylinder 51 is a sealed cylinder with a cavity, and is mounted on the base 11, and a spiral groove 511 is formed on the inner wall of the cylinder and extends upwards from the bottom; the central vent pipe 52 is a hollow pipe with a closed upper end, is fixed on the base 11, has a bottom communicated with the main gas pipe 21, and has a top penetrating through the bottom of the liquid storage cylinder 51 and extending to the upper part of the liquid storage cylinder 51; the upper part of the central vent pipe 52 is provided with a separation umbrella 53, the middle part of the separation umbrella 53 is sealed and buckled with the upper end of the central vent pipe 52, one side of the separation umbrella 53 is provided with a lateral through hole 531, the inside of the liquid storage cylinder 51 is communicated with the central vent pipe 52 through the lateral through hole, and a gap is arranged between the umbrella-shaped edge of the separation umbrella 53 and the inner wall of the liquid storage cylinder 51.
One end of the gas output pipeline 26 is arranged on the lower side surface of the liquid storage cylinder 51, and the cavity of the liquid storage cylinder 51 is communicated with the gas output pipeline 26. One end of the liquid drainage pipeline 24 is arranged at the bottom of the liquid storage cylinder 51, and the cavity of the liquid storage cylinder 51 is communicated with the liquid drainage pipeline 24.
The pressure gas in the main gas pipe 21 flows from the lateral through hole 531 of the isolating umbrella 53 to the side surface through the central vent pipe 52, the isolating umbrella 53 prevents the pressure gas from flowing directly downwards, but forces the gas flow to flow along the spiral groove 511 from the inner wall of the liquid storage cylinder 51, in the process that the gas flow impacts the spiral groove 511 on the inner wall of the liquid storage cylinder, moisture particles in the gas impact and attach to the cylinder wall, and most of the gas flow flows spirally under the guidance of the spiral groove 511. Meanwhile, after passing through a gap between the isolating umbrella 53 and the inner wall of the liquid storage cylinder, the cross section of a channel of the air flow is enlarged, the flow velocity of the air flow is reduced according to the Bernoulli effect, and moisture particles in the air are attached to the surface of the spiral groove 511 and cannot be taken away by the air flow, so that the moisture particles are gradually gathered and enlarged, and finally water drops are formed and are left along the wall of the liquid storage cylinder. Since the lateral through hole 531 of the isolating umbrella 53 is located at the upper portion of the liquid storage cylinder 51, the liquid will be stored at the bottom of the liquid storage cylinder 51 and will not flow back to the air passage.
In the inspection process, the input pressure gas is input from the input interface 61, enters the liquid storage cylinder 51 through the gas input channel 25, the gas main pipeline 21 and the central vent pipe 52, flows along the spiral groove from the inner wall of the liquid storage cylinder 51, and enters the pressure instrument to be inspected from the gas output pipeline 26 and the output interface 62 when reaching the lower part of the liquid storage cylinder 51, at the moment, the liquid discharge electromagnetic valve 4 is in a closed state, and accumulated liquid is left at the bottom of the liquid storage cylinder 51 due to the gas with certain pressure in the liquid discharge pipeline 24; when the inspection process is finished, the liquid discharge electromagnetic valve 4 is opened, and liquid is discharged through the liquid discharge pipeline 24 through the liquid discharge port 63 under the action of pressure gas, so that gas-liquid separation and self-cleaning are realized.
According to the range and the precision of the detected pressure instrument, the high-pressure and low-pressure switching valve 42 can be controlled to switch between the high-pressure measuring assembly 31 and the low-pressure measuring assembly 32, namely, the high-pressure and low-pressure switching valve 42 is closed when high pressure is measured, the high-pressure measuring port of the high-pressure measuring assembly 31 is communicated with the gas main pipeline 21 and the gas input pipeline 25, and the high-pressure measuring assembly 31 works independently; when measuring low pressure (generally, the measurement precision is relatively high, and the high-pressure measurement assembly 31 cannot meet the requirement), the high-low pressure switching valve 42 is opened, the high-pressure measurement port of the high-pressure measurement assembly 31 and the low-pressure measurement port of the low-pressure measurement assembly 32 are both communicated with the gas main pipe 21 and the gas input pipe 25, the high-pressure measurement assembly 31 and the low-pressure measurement assembly 32 work, and the measurement result is based on the low-pressure measurement assembly 32 with high precision.
The automatic and orderly control of the gas pressure calibrator needs to electrically connect the high-pressure measuring component 31, the low-pressure measuring component 32, the high-low pressure switching valve 42 and the liquid discharge electromagnetic valve 4 to the control module 03, and the control module 03 controls the actions of the electromagnetic valves according to a preset control sequence and receives the detection data of the measuring component 3.
It should be noted that the above-mentioned embodiments of the present invention do not limit the scope of the present invention, but are merely examples provided to facilitate understanding of the inventive concept, and various modifications and improvements may be made to the structure of the inventive device within the scope of the inventive concept, for example, the number of the measuring assemblies 3 is not limited to two, and may be one or more; the installation of the measuring component 3 is not limited to the side surface of the measuring component seat 12, and the measuring component can be flexibly arranged according to space requirements and structural shapes; the high-low pressure switching valve 42 can be a three-way electromagnetic valve, a high pressure measuring port of the high pressure measuring assembly 31 is connected with a normally closed end of the three-way electromagnetic valve, a low pressure measuring port of the low pressure measuring assembly 32 is connected with a common end of the three-way electromagnetic valve, a normally open end of the three-way electromagnetic valve is connected with the atmosphere, the three-way electromagnetic valve is not electrified when measuring high pressure, the high pressure measuring port of the high pressure measuring assembly 31 is communicated with the gas main pipeline 21 and the gas input pipeline 25, and a low pressure measuring port of the low pressure measuring assembly 32 is communicated with the atmosphere, so that the low pressure; when measuring low pressure, the three-way electromagnetic valve is electrified, the normally closed end is communicated (opened) with the public end, the normally open end is disconnected (closed) with the public end, and the low-pressure measuring port of the low-pressure measuring assembly 32 and the high-pressure measuring port of the high-pressure measuring assembly 31 are communicated with the gas main pipeline 21 and the gas input pipeline 25.
The interface module 01 can replace a proper measuring component 3 according to the measuring range and the precision of the detected pressure instrument, or switch between a high-pressure measuring component 31 and a low-pressure measuring component 32 by controlling a high-low pressure switching valve 42, so that the adaptability is good, and the detection precision is ensured; the spiral dehumidifying and filtering unit 5 is used to perform dehumidifying and filtering process on the input pressure gas to form clean and dry pressure gas and prevent the liquid remained in the tested pressure instrument from entering the gas pressure control mechanism 100 of the present invention through the interface module.
Main reference numerals of the control module 03:
031-control circuit board; 032-terminal block;
033-protective cover, 0331-circuit board cover, 0332-side cover.
Referring to fig. 4, the control module 03 includes a control circuit board 031 and a connection terminal 032 installed on the control circuit board 031, the electrical connection line 101 of each solenoid valve and the pressure sensor assembly 10 in the solenoid valve set V in the control execution module 02, and the measurement assembly 3 and the high-low pressure switching valve 42 and the liquid discharge solenoid valve 41 in the interface module 03 are electrically connected to the control circuit board 031 through the connection terminal 032. The control circuit board 031 receives the data signals detected by the measurement assembly 3 and the pressure sensor assembly 10, and generates control commands according to control targets and control logic to send to the control ends of the electromagnetic valves, so as to control the actions of the electromagnetic valves to realize accurate gas pressure control.
Further, the control module 03 further includes a protection cover 033 for protecting and fixing the control circuit board 031, referring to fig. 4, the protection cover 033 includes a circuit board cover 0331 and a side cover 0332, the circuit board cover 0331 covers the control circuit board 031, and the side cover 0332 is installed on the control execution module 02 and the interface module 01 to isolate each solenoid valve from the outside, thereby reducing the thermal influence of the heat radiation of the solenoid valve on other circuit boards, measurement boards, and other systems.
The modules of the gas pressure control mechanism 100 are independent of each other, are connected in an intubation mode through gas path interfaces, and are connected with electric connection wires in a golden finger insertion mode, so that the gas pressure control mechanism is simple to operate, reliable to work and convenient to maintain.
The gas pressure control mechanism 100 mainly has two working modes, namely a positive pressure control mode and a negative pressure control mode, and the working process is as follows:
in the positive pressure control mode, if the input interface 61 and the output interface 62 of the interface module 01 are connected to the micro gas pressure generating mechanism 04, the air is firstly charged into the positive pressure air chamber 711 of the control execution module 02, that is, the first electromagnetic valve V1 is de-energized (closed), the second electromagnetic valve V2 is energized (closed), the sixth electromagnetic valve V6 is de-energized (closed), the fourth electromagnetic valve V4 is switched to the air inlet 94 to communicate with the atmosphere, the fifth electromagnetic valve V5 is switched to the exhaust gas discharge pipeline 83, at this time, the air enters the micro gas pressure generating mechanism 04 from the air inlet 94 through the fourth electromagnetic valve V4, the high pressure gas generated by the micro gas pressure generating mechanism 04 enters the positive pressure air chamber 711 through the positive pressure air distribution pipeline 81 and the second electromagnetic valve V2, at this time, the third electromagnetic valve V3 may be in an energized state or a de-energized state, the positive pressure air chamber 711 is charged to store the pressure gas until the pressure value detected by the pressure sensor, the micro gas pressure generating mechanism 04 stops working.
The positive pressure gas container 711 plays a role in gas source and buffer in the gas pressure control process, the liquid storage cylinder 51 of the interface module 01 plays a role in buffer, if the pressure value of the measurement component 3 acquired by the control module 03 is smaller than the preset pressure value, the third electromagnetic valve V3 is electrified (switched on), gas enters the gas output pipeline 26 of the interface module 01, and the pressure rises; if the pressure value of the measurement component 3 acquired by the control module 03 is greater than the preset pressure value, the third electromagnetic valve V3 is powered off (closed), the sixth electromagnetic valve V6 is powered on (switched on), gas is discharged from the liquid discharge port 63 through the sixth electromagnetic valve V6, the fifth electromagnetic valve V5, the waste gas discharge pipeline 83 and the waste gas inlet 64 of the interface module 01 until the pressure value of the measurement component 3 meets the preset pressure value, and the sixth electromagnetic valve V6 is powered off.
In the negative pressure control mode, if the positive pressure input port 91 and the negative pressure input port 92 of the control execution module 02 are connected to the micro gas pressure generating mechanism 04, air is firstly pumped from the negative pressure air volume 712 of the control execution module 02, i.e. the first electromagnetic valve V1 is energized (the waste gas discharge pipeline 83 is connected), the second electromagnetic valve V2 is de-energized (the air pump and the pipeline of the positive pressure air volume 711 are disconnected), the fourth electromagnetic valve V4 is switched to the negative pressure air volume 712, the fifth electromagnetic valve V5 is switched to the waste gas discharge pipeline 83, at this time, the air is pumped (vacuumized) to the negative pressure air volume 712 by the air pump until the pressure sensor component 10 obtained by the control module 03 detects that the pressure value meets the preset negative pressure value, the fourth electromagnetic valve V4 is switched to the air inlet 94, the fifth electromagnetic valve V5 is switched to the negative pressure air volume 712, the sixth electromagnetic valve V6 is energized, the micro gas pressure generating mechanism 04 stops working, and the negative pressure gas enters the gas, and then enters the pressure instrument to be tested.
In the process of controlling the gas pressure of the negative pressure gas container 712, the liquid storage cylinder 51 of the interface module 01 plays a role of a gas source, when the control module 03 obtains that the pressure value measured by the measuring component 3 is greater than a preset negative pressure value, the sixth electromagnetic valve V6 is electrified, the negative pressure gas container 712 and the gas output pipeline 26 of the interface module 01 are connected, the gas in the gas output pipeline 26 is sucked into the negative pressure gas container 712 until the pressure value measured by the measuring component 3 meets the preset negative pressure value, and then the sixth electromagnetic valve V6 is powered off; when the control module 03 obtains that the pressure value measured by the measurement component 3 is smaller than the preset negative pressure value, the third electromagnetic valve V3 is powered on, the positive pressure gas container 711 and the gas output pipeline 26 are connected, gas (equal to atmospheric pressure) in the positive pressure gas container 711 enters the gas output pipeline 26 until the pressure value measured by the measurement component 3 meets the preset negative pressure value, and then the third electromagnetic valve V3 is powered off.
It can be known from the working process of the gas pressure control device of the present invention that the third electromagnetic valve V3, the sixth electromagnetic valve V6 and the air pump are always in a dynamic and intermittent switching state, and the state is changed under the control of the control module 03, the positive pressure gas container 711 and the negative pressure gas container 712 function as a pressure source, and the liquid storage cylinder 51 performs a buffering function, so as to facilitate the stability of the gas pressure control and realize the precise control of the gas pressure.
Micro gas pressure generating mechanism 04
The micro gas pressure generating mechanism 04 is used as a pressure generating mechanism of the gas pressure calibrator, and can provide pressure gas and vacuum power for the gas pressure control mechanism 100, and simultaneously reduce the influence of vibration generated in the pressure generating process on other gas circuit components and circuit parts of the gas pressure calibrator.
The main reference numbers of the micro gas pressure generating mechanism 04 are as follows:
401-vibration reduction supporting base, 411-upper supporting plate, 412-lower supporting plate, 413-central vibration absorber, 4131-limiting sleeve, 4132-limiting column and 4133-elastic damping element; 414-elastic support piece, 4141-double-coil spring, 4142-interface, 4143-arc groove and 4144-bending part;
402-transmission driving unit, 421-motor, 422-synchronous belt speed reducing mechanism, 4221-driving wheel, 4222-driven wheel and 4223-synchronous belt; 423-eccentric shaft, 424-connection circuit board, 425-electrical connection wire;
403-cylinder piston unit, 431-cylinder, 4311-primary cylinder, 4312-secondary cylinder, 4313-cylinder seat; 432-piston assembly, 4321-primary piston, 4322-secondary piston, 4323-piston rod; 433-high pressure one-way valve combination, 434-low pressure one-way valve combination, 435-connecting pin, 436-connecting rod, 437-transition pipeline;
404-connecting pipeline, 441-low pressure elastic pipeline, 442-high pressure elastic pipeline;
405-interface unit, 451-gas input interface, 452-gas output interface.
Fig. 5A and 5B show the structure of the micro gas pressure generating apparatus 04. As shown in fig. 5A and 5B, the micro gas pressure generating mechanism 04 includes a vibration-damping support base 401, a micro piston type air pump installed on the vibration-damping support base 401, an interface unit 405, and a gas connection pipeline 404 communicating the micro piston type air pump with the interface unit 405, and the device integrates the vibration-damping support base 401 and the micro piston type air pump together to form a micro gas pressure generating mechanism with a vibration-damping structure, and the mechanism realizes output of pressure gas under the condition of avoiding influence of vibration on an air path component and a circuit component, wherein:
the micro piston type air pump comprises a cylinder piston unit 403 and a transmission driving unit 402, wherein the cylinder piston unit 403 comprises a cylinder 431 and a piston assembly 432 positioned in the cylinder, the transmission driving unit 402 is used for driving the piston assembly 432 to reciprocate in the cylinder 431 to generate high-pressure air, and comprises a motor 421, a synchronous belt speed reducing mechanism 422 and an eccentric shaft 423, in one embodiment (see fig. 5A to 5C), the synchronous belt speed reducing mechanism 422 comprises a driving wheel 4221, a driven wheel 4222 and a synchronous belt 4223 connecting the driving wheel and the driven wheel, an output shaft of the motor 421 is fixed on the driving wheel 4221, and the surfaces of the driving wheel 4221 and the driven wheel 4222 are preferably provided with tooth-shaped structures so as to increase transmission force with the synchronous belt. The eccentric shaft 423 is fixed to the driven pulley 4222 and rotates together with the driven pulley. The upper part of the eccentric shaft 423 is connected with a connecting pin 435 fixed on the piston rod 4323 through a connecting rod 436 to form a crank-slider mechanism. The rotation of the eccentric shaft 423 swings the connecting rod 436 to be converted into the reciprocating linear motion of the piston rod 4323.
In one embodiment, a connection circuit board 424 is disposed on the top of the motor 421, an electrical connection wire 425 is led out from the connection circuit board 424, one end of the electrical connection wire 425 is clamped into a groove of the connection circuit board 424 for fixation, the other end of the electrical connection wire 425 is connected to a control circuit board, and a control end and a driving interface of the motor 421 are connected to the control circuit board through the connection circuit board 424 and the electrical connection wire 425 for controlling the operation of the motor 421, so as to control the operation of the micro piston air pump. The structure of the electric connecting wire 425 led out from the connecting circuit board 424 avoids the repeated bending of the electric connecting wire 425 at the connecting point of the electric connecting wire 425 and the motor 421 in the using process, and improves the reliability of the system. The motor 421 may be a direct current motor or a speed reduction motor, which is not limited in this embodiment.
In one embodiment, referring to fig. 5C, the cylinder 431 includes a primary cylinder 4311, a secondary cylinder 4312, and a cylinder seat 4313 for supporting and connecting the primary cylinder and the secondary cylinder, the piston assembly 432 includes a primary piston 4321, a secondary piston 4322, and a piston rod 4323 connecting the primary piston and the secondary piston, the primary piston 4321 is located in the primary cylinder 4311, the secondary piston 4322 is located in the secondary cylinder 4312, and a connecting pin 435 is fixed to the piston rod 4323 and inserted into the connecting rod 436.
Further, the cylinder-piston unit 403 further includes a high-pressure check valve group 433 and a low-pressure check valve group 434 respectively disposed at both ends of the cylinder 431. In one embodiment, the high pressure check valve set 433 is disposed at the end of the secondary cylinder 4312, the secondary cylinder 4312 is provided with a high pressure air inlet and a high pressure air outlet communicating with the interior of the secondary cylinder, the low pressure check valve set 434 is disposed at the end of the primary cylinder 4311, and the primary cylinder 4311 is provided with a low pressure air inlet and a low pressure air outlet communicating with the interior of the primary cylinder; the connection pipeline 404 includes a low-pressure elastic pipeline 441 and a high-pressure elastic pipeline 442, the interface unit 405 includes a gas input interface 451 and a gas output interface 452, a high-pressure gas outlet of the secondary cylinder 4312 is communicated with the gas output interface 452 through the high-pressure elastic pipeline 442, and a check valve in the high-pressure check valve group 433 is connected in series to the high-pressure elastic pipeline 4542 (for example, the high-pressure elastic pipeline 442 is a thin stainless steel pipe bent into a coil spring shape, and the spring-shaped structure ensures that the high-pressure elastic pipeline has sufficient elasticity to isolate the vibration generated by the micro piston type air pump); a low-pressure air inlet of the primary cylinder 4311 is communicated with the gas input interface 451 through a low-pressure elastic pipeline 441, and a check valve in the low-pressure check valve group 434 is connected in series to the low-pressure elastic pipeline 441 (for example, the low-pressure elastic pipeline 441 is a rubber hose); the low-pressure air outlet of the primary cylinder 4311 is communicated with the high-pressure air inlet of the secondary cylinder 4212 through a transition pipeline 437 arranged on a cylinder seat 4313, and a check valve in the low-pressure check valve bank 434 and a check valve in the high-pressure check valve bank 33 are respectively connected in series on the transition pipeline 437 to control the air flow direction.
Compared with the traditional installation mode of the separated high-low pressure check valve and the traditional installation mode of the separated low-low pressure check valve, the piston assembly 431 is replaced by combining the low-pressure check valves and the high-pressure check valves into a whole, namely the low-pressure check valve group 434 and the high-pressure check valve group 433, and the piston assembly can be exposed by only disassembling the valve groups at the corresponding ends without disassembling the check valves and the corresponding fixing structures one by one, so that the piston assembly is convenient to maintain and replace.
Referring to fig. 5A and 5D, the vibration-damping supporting base 401 is used to support and fix the micro piston-type air pump, and the connecting and mounting mechanism as the micro gas pressure-generating mechanism is mounted with other components, and is also used as a vibration-damping, vibration-absorbing and limiting component to reduce the influence of vibration generated during the operation of the mechanism on other components. In this embodiment, the vibration damping support base 401 includes an upper support plate 411, a lower support plate 412, elastic supports 414 connecting the peripheries of the upper support plate and the lower support plate, and a central vibration absorber 413 installed between the upper support plate and the lower support plate, the plurality of elastic supports 414 are arranged at intervals at a specific angle, so as to realize rigidity matching in different vibration directions, for example, three elastic supports 414 are arranged in a triangle to form a stable triangle structure; the central vibration absorber 413 is disposed at the center of the torsional vibration of the upper support plate 11 to absorb the vibration caused by the vertical and horizontal linear motions.
One embodiment of the central vibration absorber 413 is shown in fig. 5D and comprises a position-limiting sleeve 4131, a position-limiting column 4132 and an elastic damping element 4133, wherein the position-limiting sleeve 4131 is of a hollow sleeve structure, the cylinder wall at the upper end opening of the position-limiting sleeve extends inwards to form a retracted closed port, the top of the closed port forms an upper step, the lower part of the closed port forms a lower step, the bottom of the closed port extends outwards to form an outer step, the bottom of the outer step is tightly fixed (for example, fixed by a screw) with the lower support plate 412, preferably, the lower part of the position-limiting sleeve 4131 is embedded into a groove formed in the lower support plate 412; spacing post 4132 is the T shape structure of invering, including horizontal plate and vertical post, the cover is equipped with elastic damping element 4133 on the vertical post, vertical post upper portion is provided with the screw thread, with last backup pad 411 threaded connection, the lower part of vertical post stretches into in the stop collar 4131 and the diameter of horizontal plate is greater than the diameter that the stop collar 4131 upper portion closed up, make elastic damping element 4133 inject between the horizontal plate of last backup pad 411 and spacing post 4132, the last step and the lower step of the department of closing up in the upper portion of stop collar 4131 have injectd the lower limit position and the upper limit position of last backup pad 411 respectively. Preferably, the elastic damping element 4133 is a hollow cylindrical structure, preferably a rubber column, the rubber column is sleeved on the vertical column of the limiting column 4132, and the upper closing-up circumferential edge of the limiting sleeve 131 is nested with a quincuncial groove arranged in the middle of the rubber column (see fig. 5F), so as to increase the flexibility and stability of the rubber column. Preferably, the upper part of the vertical column of the spacing column 4132 is further provided with a circular spacing step, and the spacing step is matched with the inner hole of the elastic damping element 4133 to limit the thread stroke of the spacing column 4132 and prevent the elastic damping element 4133 from extruding out of the spacing sleeve to close up when in overload.
Referring to fig. 5E, the elastic supporting member 414 is a double-spiral reverse spring structure, mainly functioning as supporting and vibration isolating, in which the lower portions of the double-spiral springs 4141 are connected and the upper portions thereof are separated to form the interface 4142, and the symmetrical structure ensures balanced stress. The spring structure is characterized in that the spring structure is a spiral spring in the horizontal direction and bears compression deformation, and the spring structure is a torsion spring stress mode in the vertical direction. The elastic coefficient of the spring in different directions can be adjusted by adjusting the wire diameter and the number of turns of the spring to adapt to different vibration sources, and the matching of the vibration isolation performance of the elastic support 414 in different directions can be realized by adjusting the position distribution of a plurality of springs. In one embodiment, the upper part of the double-spiral spring is separated to form a joint 4142, and the end part of the joint is provided with a bent part 4144, so that the double-spiral spring is prevented from being reversely installed while being fixed; the lower connecting portion forms a circular arc groove 4143 for positioning, for example, when the double coil spring is installed, the bent portion 4144 at the upper interface of the double coil spring is inserted into the corresponding hole of the upper support plate 411, and the screw passes through a pressing plate, the interface 4142 portion or the circular arc groove 4143 portion to fix the elastic supporting member 14 in the circumferential direction of the upper support plate 411 and the lower support plate 412.
In one embodiment, the cylinder piston unit 403 and the transmission driving unit 402 are both mounted on the upper support plate 411 of the vibration damping support base 401, the output shaft of the motor 421 of the transmission driving unit 402 passes through the upper support plate 411 and is connected to the driving wheel 4221 located between the upper support plate 411 and the lower support plate 412, and a through hole is formed in the lower support plate 412 corresponding to the position below the driving wheel 4221; the cylinder block 4313 of the cylinder-piston unit 403 is fixed to the upper support plate 411, and the driven pulley 4222 is mounted to the upper support plate 411, fixed to the eccentric shaft 423, and rotated at the same time. The eccentric shaft 423 is connected to a connecting pin 435 fixed to the piston rod 4333 via a connecting rod 436. A through hole is also formed in the position, corresponding to the driven wheel 4222, of the lower support plate 412; the lower support plate 412 is provided with through holes, so that the interference between the driving wheel 4221 and the driven wheel 4222 and the lower support plate 412 during the working vibration of the device can be prevented, the weight of the whole mechanism can be reduced, and the light weight of the device can be realized.
The motor 421 is located at one side of the cylinder body 431 and the cylinder body base 4313 to form a triangular structure, the triangular structure vibrates stably compared with a traditional linear structure, and works stably, in the structure, the high-pressure check valve group 433 and the low-pressure check valve group 434 at two ends of the cylinder body 431 are exposed, when the piston assembly 432 needs to be maintained or replaced, only the valve group at the corresponding end needs to be detached, the corresponding piston can be exposed, and the piston assembly is convenient to maintain or replace.
In one embodiment, referring to fig. 5A, the interface unit 405 is secured to a lower support plate 412 of the vibration dampening support base 401. The gas pressure that second stage cylinder body 4312 exported is high (can compress the air to 7.5MPa from atmospheric pressure in the short time), the pipeline that needs to connect high-pressure gas outlet and gas output interface 452 can bear higher pressure, the tradition adopts the steel pipe as high-pressure pipeline, in this embodiment, will install the high-pressure gas outlet of second stage cylinder body 4312 on last backup pad 11 and connect to the gas output interface that is located on lower support plate 412 through rigid connection (steel pipe), must restrict the damping effect of damping support base 1, therefore, communicate high-pressure gas outlet and gas output interface 452 through high-pressure elastic line 442, can bear the pressure of high-pressure gas, can prevent to produce the influence to the damping effect of damping support base 1 again.
In one embodiment, the gas input interface 451 and the gas output interface 452 of the interface unit 405 are plug-in interfaces, and the gas input interface 451 is connected to the negative pressure input interface 92 of the control execution module 02; the gas output port 452 may be connected to the positive pressure input port 91 in the control execution module 02.
When the micro gas pressure generating mechanism 04 works, the motor 421 drives the eccentric shaft 423 to rotate through the synchronous belt speed reducing mechanism 422, and then the rotary motion is converted into the horizontal reciprocating motion of the piston assembly 432, so that gas pressurization is realized; the device of the invention generates vibration when working, realizes the limit of the upper limit position and the lower limit position of the vibration of the upper support plate 411 which is fixed with the cylinder piston unit 403 and the transmission driving unit 402 by matching the elastic support part 14 arranged on the periphery of the vibration-damping support base 1 with the central vibration absorber 413 arranged in the middle part, absorbs the vibration in the vertical direction and the horizontal direction, and reduces the influence of the cylinder vibration on other parts.
The micro gas pressure generating mechanism 04 adopts the technical scheme, and has the following characteristics:
(1) the vibration reduction supporting base 401 and the micro piston type air pump are integrated together to form a micro air pressure generating mechanism with a vibration reduction structure, the mechanism realizes the output of air pressure under the condition of avoiding the influence of vibration on other components, and the mechanism has the advantages of simple structure, small volume and light weight;
(2) the cylinder piston unit 403 and the transmission driving unit 402 are arranged in parallel to form a triangular stable structure, so that compared with a traditional linear structure, the triangular stable structure has balanced vibration and stable work; in addition, the plurality of low-pressure check valves and the plurality of high-pressure check valves are respectively combined into a whole, namely the low-pressure check valve group 434 and the high-pressure check valve group 433, and the high-pressure check valve group 433 and the low-pressure check valve group 434 at the two ends of the cylinder body 431 are exposed, so that the maintenance and the replacement of the piston assembly 32 are facilitated;
(3) the elastic supporting piece 414 arranged on the periphery of the vibration reduction supporting base 401 is matched with the central vibration absorber 413 arranged in the middle of the vibration reduction supporting base to limit the upper limit position and the lower limit position of the vibration of the upper supporting plate 411 fixed with the cylinder piston unit 403 and the transmission driving unit 402, so that the vibration in each direction of the vertical direction and the horizontal direction is absorbed, and the influence of the cylinder vibration on other parts is reduced;
(4) the balance of stress is ensured by the elastic support 414 which adopts a double-helix reverse spring structure, wherein the spring structure is represented as a helical spring in the horizontal direction and bears compression deformation, and the spring structure is represented as a torsion spring stress mode in the vertical direction. The elastic coefficients of the springs in different directions can be adjusted by adjusting the wire diameters and the number of turns of the springs to adapt to different vibration sources, and the matching of the vibration isolation performance of the elastic support 414 in different directions can be realized by adjusting the position distribution of the springs;
(5) the central vibration absorber 413 is matched with a limiting column 4132 which is sleeved with an elastic damping element 4133 through a limiting sleeve 4131, so that the upper limit position and the lower limit position of the upper supporting plate 411 of the vibration damping supporting base 1 are limited, the structure is simple, and the installation is convenient.
Two-position two-way electromagnetic valve and two-position three-way electromagnetic valve
According to design requirements, one part of the electromagnetic valves used by the gas pressure calibrator is a two-position two-way electromagnetic valve, the other part of the electromagnetic valves is a three-position three-way electromagnetic valve, and the electromagnetic valves can meet the requirements by adopting the electromagnetic valves commonly used in the current market. However, the existing electromagnetic valve is usually assembled in a sleeve type threaded connection mode, and therefore the existing electromagnetic valve is large in occupied space, inflexible in installation and inconvenient to assemble, and the vent is fixed. In view of the above disadvantages of the existing solenoid valve, the invention provides a plug-in type two-position two-way solenoid valve and a two-position three-way solenoid valve which have simple structure, flexible installation and convenient assembly.
The two-position two-way electromagnetic valve and the two-position three-way electromagnetic valve provided by the invention have the following main reference numerals:
601-an electromagnetic coil; 602-a cannula; 603-a fixed iron core; 604-movable iron core, 641-blind hole; 605-a first spring, 606-a second spring; 607-first seal, 608-first seal port, 609-first pressure port, 610-second pressure port, 611-second seal, 612-second seal port, 613-second pressure port, 614-third pressure port; 615-a valve core; 616-a gasket; 6171-first O-ring, 6172-second O-ring, 6173-third O-ring, 6174-fourth O-ring; 618-lock nut, 619-gasket.
The structure of the two-position two-way electromagnetic valve provided by the invention is shown in fig. 6A, and comprises an electromagnetic coil 601, a sleeve 602 fixedly arranged in a battery coil 601, a fixed iron core 603 fixedly sleeved in the sleeve 602, a movable iron core 604 sleeved in the sleeve and positioned below the fixed iron core, a first spring 605 sleeved at the lower part of the movable iron core in a penetrating way, and a first sealing member 607 connected with the lower end of the sleeve 602, wherein the first sealing member 607 is connected with the lower end of the sleeve 602 to form a first pressure port 609 and a second pressure port 610, the movable iron core 604 is positioned in a cavity formed by the first sealing member 607, the sleeve 602 and the fixed iron core 603, the movable iron core 604 moves up and down in the sleeve 602 under the combined action of the elastic force of the first spring 605 and the magnetic force generated after the electromagnetic coil is electrified, so that the first pressure port 609 and the second pressure port 610 are connected or disconnected, thereby realizing the connection, wherein:
referring to fig. 6B, in this embodiment, an annular groove is formed at the lower portion of the plunger 604, the inner diameter of the sleeve 602 corresponding to the lower portion of the plunger is increased, and the first spring 605 is inserted into the annular groove of the plunger 604 and is limited in a space formed by the annular groove of the plunger and the inner wall of the sleeve 602; the outer diameter of the lower part of the sleeve 602 is increased to form a first step 6041, and the lower end of the electromagnetic coil 601 abuts against the first step 6041; the lower end of the plunger 604 is nested with a gasket 616.
The first sealing element 607 is arranged at the lower end of the movable iron core 604, a variable cavity is formed between the first sealing element 607, the movable iron core 604 and the sealing gasket 616, a through hole communicated with the variable cavity is arranged on the first sealing element 607, one end of the through hole close to the sealing gasket 616 is a first sealing valve port 608, and one end of the through hole far away from the sealing gasket 616 is a first pressure port 609; the side of the first sealing 607 is provided with a second pressure port 610 communicated with the variable cavity, and the second pressure port 610 may be provided in one or more. In the process that the sealing gasket 616 moves along with the plunger 604, when the sealing gasket 616 moves down along with the plunger 604, the sealing gasket 616 is tightly contacted with the first sealing valve port 608, and the variable cavity becomes small, so that the first pressure port 609 is disconnected from the variable cavity; when the sealing gasket 616 moves up along with the plunger 604, the sealing gasket 616 is separated from the first sealing valve port 608, and the variable cavity becomes large, so that the first pressure port 609 is communicated with the variable cavity, and the air passage pipeline respectively connected to the first pressure port 609 and the second pressure port 610 is switched on and off.
As shown in fig. 6A and 6B, a specific embodiment of the first sealing member 607 is shown, but the present invention is not limited to the structure of this embodiment, and this embodiment is for exemplary illustration only. In this embodiment, the first sealing member 607 includes a main body portion 6071 and a clamping portion 6072, the clamping portion 6072 is provided with a clamping groove, the edge of the clamping groove inclines outwards, the structure is matched with an elastic clamping mechanism arranged on the inner side of the lower opening end of the sleeve 602, when the first sealing member 607 is clamped with the sleeve 602, the inclined edge of the clamping portion of the first sealing member 607 and the elastic clamping piece on the inner side of the opening end of the sleeve 602 are squeezed and deformed until the elastic clamping piece is clamped into the clamping groove of the first sealing member 607, and the two are firmly clamped; an annular boss 6074 is arranged on the main body part 6071 in the circumferential direction, a second step 6075 is formed on the upper surface of the annular boss 6074, and after the first sealing element 607 is clamped with the sleeve, the lower end face of the sleeve 602 abuts against the second step 6075; at least one lateral groove 6073 is formed in the circumferential direction of the first sealing element 607 to form a second pressure port 610; an inner protrusion 6076 is arranged on the inner side of the middle part of the main body part 6071, an outer boss 6077 is arranged on the outer side of the middle part of the main body part 6071, a through hole 6078 is arranged on the middle part of the main body part 6071, the through hole penetrates through the inner protrusion 6076 and the outer boss 6077, a port of the through hole on the inner protrusion 6076 is a first sealing valve port 608, the first sealing valve port 608 is opposite to the sealing pad 616, and a port of the through hole on the outer boss 6077 is a first pressure port 609.
Preferably, the second pressure ports 610 of the first sealing member 607 are provided in two and symmetrically arranged, and a pipe connected to the second pressure ports 610 can be accessed from any one of them, and all the second pressure ports 610 are communicated with each other.
It should be noted that the present invention does not limit the installation manner between the first sealing element 607 and the sleeve 602, and the present invention may adopt any one of the open clamping groove clamping, interference pressing and fixing, snap spring connection, screw connection, and pin or screw detachable connection for connection, and the sealing element is adopted to replace the existing valve body seat, so as to reduce the overall volume of the solenoid valve, save the complex procedure of opening a pipeline in the valve body seat, and make the assembly more convenient.
In order to ensure the working reliability of the two-position two-way electromagnetic valve and prevent air leakage in the working process, the outer side of the lower part of the sleeve 602 of the two-position two-way electromagnetic valve is provided with a ring groove for nesting the first O-shaped sealing ring 6171, and the outer side boss 6077 of the first sealing element 607 is provided with a ring groove for nesting the second O-shaped sealing ring 6172. For example, when the two-position two-way solenoid valve is used as the first solenoid valve V1, it is used to connect the positive pressure air distribution pipe 81 and the exhaust gas discharge pipe 83 (see fig. 2D), when the two-position two-way solenoid valve is installed, the lower end of the two-position two-way solenoid valve is directly installed in the thread of the positive pressure valve seat 72, so that the first pressure port 609 communicates with the exhaust gas discharge pipe 83, the second pressure port 610 communicates with the positive pressure air distribution pipe 81, at this time, the outer periphery of the sleeve 602 is threadedly connected with the positive pressure valve seat 72, the outer boss 6077 of the first sealing member 607 is pressed against the positive pressure valve seat 72, the first O-ring 6171 seals the second pressure port 610 from the outside, and when the first sealing valve port 608 is pressed against the sealing pad 616 in the non-energized state, the second O-ring 6172 seals the first.
Further, the two-position two-way electromagnetic valve is further provided with a lock nut 618, a threaded hole is formed in the middle of the lock nut 618, the threaded hole is matched with external threads at the upper end of the fixed iron core 603, in order to ensure that the lock nut 618 is firmly locked with the fixed iron core 603, a gasket 619 is sleeved on the fixed iron core 603, the lock nut 618 is screwed with the upper end of the fixed iron core 603, and therefore the electromagnetic coil 601 is limited between the lock nut 618 and the first step 6041 of the movable iron core 604 and fixed.
The operation of the two-position two-way solenoid valve is as follows (the two-position two-way solenoid valve is taken as the first solenoid valve V1 for example):
when the electromagnetic coil 601 is not energized during operation, the first electromagnetic valve V1 (two-position two-way electromagnetic valve) is in an off state, at this time, the plunger 604 is located at the lowest end under the action of the elastic force of the first spring 605 (the first spring 605 is always in a compressed state), at this time, the sealing gasket 616 at the bottom of the plunger 605 presses the first sealing valve port 608 on the inner protrusion 6076 of the first sealing member 607, so that the first pressure port 609 is disconnected (not communicated) with the second pressure port 610, and the exhaust emission pipe 83 is disconnected from the positive pressure air distribution pipe 81.
When the electromagnetic coil 601 is electrified, the electromagnetic coil 601 generates magnetic force to suck the movable iron core 604 upwards, the first spring 605 is compressed until the magnetic force generated by the electromagnetic coil 601 and the elastic force of the first spring 605 reach balance or the upper end of the movable iron core 604 contacts with the fixed iron core 603, at this time, the first sealing valve port 608 on the inner protrusion 6076 of the first sealing element 607 is separated from the sealing gasket 616 at the bottom of the movable iron core 605 to generate a gap, so that the first pressure port 609 is communicated with the second pressure port 610, and further the exhaust gas discharge pipeline 83 is communicated with the positive pressure gas distribution pipeline 81. After the power is cut off, the magnetic force disappears, and the plunger 604 moves downwards under the elastic force of the first spring 605, so that the first sealing valve port 608 is sealed again.
The above-mentioned embodiment is a typical embodiment of the two-position two-way solenoid valve of the present invention, the present invention is not limited to the specific implementation of the two-position two-way solenoid valve, and various structural modifications, installation mode changes, or component replacement may be performed within the scope of the inventive concept, for example, the first sealing member 607 and the sleeve 602 may be integrally formed or may be integrally fixed by welding; the shape of the second pressure port 610 of the first sealing member 607 may be a semicircular groove, a rectangular groove, an arc-shaped groove, or other irregular shapes, but the shape is not limited thereto.
The two-position two-way electromagnetic valve adopts the first sealing element 607 to replace the existing electromagnetic valve island, so that the process of forming a channel is omitted, the first sealing element 607 can be directly clamped on the electromagnetic valve, the assembly is convenient, and the volume is small; the air vent setting of this solenoid valve can set up a plurality ofly in the circumference of first sealing member 607, and can the direct mount on the disk seat that corresponds for the gas circuit pipeline design is more nimble.
Referring to fig. 6C, the present invention further provides a two-position three-way electromagnetic valve, which is designed on the basis of the two-position two-way electromagnetic valve, and is different from the two-position two-way electromagnetic valve in that:
the upper portion of the movable core 604 is provided with a blind hole 641, the first spring 605 is disposed in the blind hole 641, the upper end contacts the fixed core 603, the first spring 605 is always in a compressed state, and the movable core 604 can move up and down in the sleeve 602.
Compared with the two-position two-way electromagnetic valve, a second sealing element 611 is added between the first sealing element 607 and the sleeve 602, the second sealing element 611 is connected with the lower end of the sleeve 602, the first sealing element 607 is connected with the lower end of the second sealing element 611, and the sealing gasket 616 is arranged in an invariable cavity formed by the first sealing element 605 and the second sealing element 611. In one embodiment, the sealing pad 616 is embedded in a valve core 614, the lower end of the valve core 614 is symmetrically provided with the second spring 606, the lower end of the second spring 606 abuts against the inner side of the first sealing member 607, the sealing pad 616 corresponds to the first sealing valve port 608 arranged in the middle of the first sealing member 607, the valve core 614 is provided with a valve rod 615 extending upwards integrally, the upper end of the valve rod 615 penetrates through the second sealing member 611 to contact the lower end of the plunger 603, and the plunger 603 pushes the valve core 614 to move downwards through the valve rod 615 when moving downwards until the sealing pad 616 is in close contact with the first sealing valve port 608.
In one embodiment, the second sealing element 611 is provided with a through hole communicating with the non-variable cavity, one port of the through hole near the non-variable cavity is a second sealing valve port 612 corresponding to the upper end of the gasket 616, and the other port is a third pressure port 613 arranged at one side of the second sealing element; the lateral recess of the first sealing 607 forms a second pressure port 610 which can communicate with only one of the first pressure port 609 and the third pressure port 613.
Similarly, in order to ensure the connection and installation airtightness between the solenoid valve and the valve seat, a first O-ring 6171 is arranged on the outer periphery of the lower end of the sleeve 602, a second O-ring 6172 is arranged on the lower end of the first sealing member 607, in the two-position three-way solenoid valve, a third O-ring 6173 is arranged on the outer periphery of the connection portion of the second sealing member 611 and the sleeve 602, and a fourth O-ring 6174 is arranged on the outer periphery of the first sealing member 607, so that the solenoid valve and the valve seat can be connected in a sealing manner, and good sealing between pipelines connected with different pressure ports can be ensured.
The two-position three-way electromagnetic valve can be directly installed on the valve seat of the corresponding pipeline through threaded connection, the valve seat of the existing two-position three-way valve is omitted, the miniaturization of the electromagnetic valve is realized, and the working principle of the two-position three-way electromagnetic valve is as follows (the two-position three-way electromagnetic valve is taken as a fourth electromagnetic valve V4 for example, and the description is given by referring to FIGS. 2D and 6D):
in operation, when the electromagnetic coil 601 is not energized, the fourth electromagnetic valve V4 (two-position three-way electromagnetic valve) is in a state where the second pressure port 610 is communicated with the third pressure port 613, the plunger 604 is located at the lowest end under the action of the elastic force of the first spring 605 (the first spring 605 is always in a compressed state), at this time, the plunger 604 compresses the valve rod 615, and the sealing gasket 616 compresses the first sealing valve port 608 on the first sealing member 607, so that the first pressure port 609 is disconnected (not communicated) with the second pressure port 610, and the second pressure port 610 is communicated with the third pressure port 613, so that the negative pressure distribution duct 82 is communicated with the negative pressure gas container 712, and the negative pressure distribution duct 82 is disconnected from the air inlet 94 (external atmosphere).
When the electromagnetic coil 601 is energized, the electromagnetic coil 601 generates magnetic force to suck the plunger 604 upwards, the first spring 605 is compressed until the magnetic force generated by the electromagnetic coil 601 is balanced with the elastic force of the first spring 605 and the second spring 606 or the upper end of the sealing gasket 616 is in contact with the second sealing valve port 612 of the second sealing element 611, at this time, the first sealing valve port 608 of the first sealing element 607 is separated from the sealing gasket 616 to generate a gap, so that the first pressure port 609 is communicated with the second pressure port 610, the negative pressure air distribution pipeline 82 is communicated with the air inlet 94 (external atmosphere), and the negative pressure air distribution pipeline 82 is disconnected from the negative pressure air volume 712. After the power is cut off, the magnetic force disappears, and the plunger 604 moves downwards under the elastic force of the first spring 605, so that the first sealing valve port 608 is sealed again.
The design concept of the two-position three-way electromagnetic valve is similar to that of the two-position two-way electromagnetic valve, and the two-position three-way electromagnetic valve has basically the same technical effect, and is not repeated here.
Mounting rack 08
The mounting rack 08 is a mounting support member of the whole gas pressure calibrator, and referring to fig. 7A and 7B, the mounting rack is a square rack body, the upper end of the mounting rack is provided with a mounting groove 087 with a through hole for mounting the electrical measurement component 600, and the through hole of the mounting groove 087 is used for passing through an electrical connection wire, which helps to reduce the weight; the left side and the right side of the mounting frame 08 are respectively provided with a first side plate 082 and a second side plate 083, the first side plate 082 is provided with a liquid discharge joint 0882 and an output joint 0821, and the second side plate 083 is provided with a power supply interface 0833, a plurality of net openings 0831 and a USB opening 0832; the mounting rack 08 is internally provided with an isolation cover 084, the isolation cover 084, a first side plate 082 and a second side plate 083 divide the interior of the mounting rack 08 into two areas which are respectively a first mounting area 085 and a second mounting area 086, a first guide rail groove 0851 is arranged at the bottom of the first mounting area 085, a second guide rail groove 0861 is arranged at the bottom of the second mounting area 086 and is respectively used for mounting the gas pressure control mechanism 100 and the micro gas pressure generating mechanism 04, and the two guide rail grooves play a role in guiding and limiting and ensure that a mechanism pushed in along the guide rail grooves can be reliably connected with corresponding interfaces; meanwhile, in order to ensure good heat dissipation of the micro gas pressure generating mechanism 04, an exhaust fan 0862 is further arranged at the bottom of the second mounting area 086, and the exhaust fan 0862 corresponds to the exhaust port 5101 of the housing 500; the isolation cover 084 wraps the miniature gas pressure mechanism 04, and the upper end of the isolation cover is provided with a plurality of cold air holes 0841 and a plurality of wire clamping grooves 0842; the rear end of the mounting rack 08 is provided with an air path connecting seat 088, the air path connecting seat 088 corresponding to the first mounting area 085 is provided with a liquid discharge hole 0881, an air distribution connecting hole 0882 and an output hole 0883, and the air path connecting seat 088 corresponding to the second mounting area 085 is provided with a pressure making mechanism connecting hole 0884.
As shown in fig. 7A, in the above structure, the liquid discharging hole 0881 and the output hole 0883 on the gas circuit connecting seat 088 are respectively communicated with the liquid discharging joint 0822 and the output joint 0821 on the first side plate 082 through pipelines; two pressure making mechanism connecting holes 0884 and two gas distribution connecting holes 0882 on the gas path connecting seat 088 are respectively and correspondingly communicated through pipelines.
During installation, as shown in fig. 1C and 7C, the micro gas pressure generating mechanism 04 as a whole is pushed into the second installation area 086 along the second guide rail groove 0861 of the second installation area 086 until the gas input interface 451 and the gas output interface 452 of the micro gas pressure generating mechanism 04 are butted with the pressure generating mechanism connecting hole 0884 on the gas path connecting seat 088, that is, the micro gas pressure generating mechanism is installed in place; similarly, the gas pressure control mechanism 100 is pushed into the first installation area 085 along the first guide rail groove 0851 of the first installation area 085 as a whole until the output port 62 and the liquid discharge port 63 of the interface module 01 and the positive pressure input port 91 and the negative pressure input port 92 of the control execution module 02 in the gas pressure control mechanism 100 are respectively abutted with the output hole 0883, the liquid discharge hole 0881 and the gas distribution connection hole 0882 on the gas circuit connection seat 088, so that the gas input port 451 and the negative pressure input port 92 of the micro gas pressure generating mechanism 04 are communicated, and the gas output port 452 and the positive pressure input port 91 are communicated.
In the structure, the gas pressure control mechanism 100 and the micro gas pressure generating mechanism 04 are integrated, and the rapid assembly is realized by adopting a push-pull insertion mode, so that the installation and maintenance are convenient, the working reliability and maintainability of the gas pressure calibrator are improved, and the maintenance cost is reduced.
The system board 200 is a core board of the whole gas pressure checking instrument, and the interface board 300, the measurement board 610 of the electrical measurement component 600 and the control circuit board 031 of the control module 03 are circuit integrated boards of the gas path component, and are used for transferring electrical signals of the power supply module 700 and the gas path component to the system board 200.
The electrical measurement assembly 600 is used to enable measurement of electrical signals, electrical signals related to pressure output. Referring to fig. 1, an electrical measurement assembly 600 is disposed within the upper end mounting slot of the mounting bracket 08. As shown in fig. 8, the electrical measurement assembly 600 includes a measurement board 610, and a button 620 and an electrical measurement interface 630 electrically connected to the measurement board, in one embodiment, the button 620 and the electrical measurement interface 630 are mounted on and exposed out of a panel, a housing is fastened to the panel, the measurement board 610 is packaged in a space formed by the housing and the panel, and the housing is provided with heat dissipation holes.
The system board 200 is used as the brain of the whole gas pressure calibrator and plays a leading role in controlling and logically controlling the whole gas circuit. The system board 200 is plugged into the first connector 310 of the interface board 300, and is fixedly connected to the frame body of the mounting frame 08, which is vertically disposed with respect to the interface board 300, so as to save space and facilitate heat dissipation of the circuit board.
Referring to fig. 7A, a second connector 210 for connecting a control circuit board 031, a third connector 220 for connecting an electrical measurement component 600, and a fourth connector 230 for connecting a touch display screen 400 are distributed on the system board 200, and when the gas pressure control mechanism 100 is installed in place, the control circuit board 031 of the control module 03 is inserted into the second connector 210 of the system board 200 in an aligned manner; similarly, when the electrical measurement assembly 600 is installed in place, the measurement board 610 of the electrical measurement assembly 600 is inserted into the third connector 220 on the system board 200; the data line of the touch display screen 400 is clipped through the clipping slot 0842 on the isolation cover 084 and then is plugged into the fourth connector 230 on the system board 200.
Further, the system board 200 is also provided with a communication module such as a WiFi module and a bluetooth module, and an external communication interface connected to the system board is provided with a corresponding net port 0831 and a corresponding USB interface 0832.
With reference to fig. 1 to 8, the assembly process of each part of the gas pressure calibrator of the present invention is as follows:
firstly, the interface board 300 is fixed on the air path connecting seat 088 of the mounting rack 08, and then the system board 200 is inserted into the first connector 310 on the interface board 200 and fixed on the rack body of the mounting rack 08;
the positive and negative pressure output interface 93 and the waste gas output interface 95 of the control execution module 02 are respectively communicated with the input interface 61 and the waste gas inlet 64 of the interface module 01, the electric connecting wire of the control execution module 02 is inserted into the connecting terminal 032 of the control module 03, and then the control execution module 02, the interface module 01 and the control module 03 are fixed into a whole to form the gas pressure control mechanism 100; then, the gas pressure control mechanism 100 and the micro gas pressure generating mechanism 04 are respectively pushed into the first mounting area 085 and the second mounting area 086 to be mounted in place, and at this time, the control module 03 is plugged into the second connector 210 of the system board 200;
the touch display screen 400 is arranged on the flip cover 530, the flip cover 530 is arranged at the upper end of the frame body of the mounting frame 08 through the damping shaft, and the electric connecting wire of the touch display screen 400 is inserted into the wire clamping groove 0842 of the isolation cover 084 and then is inserted into the fourth connector 230 of the system board 200; then the electric measuring component 600 is placed in the mounting groove 087 at the upper end of the mounting rack 08, and the measuring plate 610 of the electric measuring component 600 is inserted into the third connector 220 of the system board 200;
finally, the lower case 510 and the upper case 520 of the case 500 are mounted, and the battery module 700 is mounted at the bottom of the lower case 510 to be fixed.
The gas pressure calibrator disclosed by the invention adopts modular assembly and compact structural design to realize intelligent control on a circuit system and a gas circuit system and finish operations of intelligent pressure making, pressure control, pressure relief, pollution discharge and the like of the gas circuit system. It has the following characteristics:
1) the gas pressure calibrator adopts a modular design, and each gas circuit component is assembled in a push-pull mode, so that complicated gas circuit wiring connection is omitted, and the gas pressure calibrator is convenient to install and maintain; the design and installation of the circuit components adopt a plug-in mode, the vertical space is fully utilized, and meanwhile, the lightweight design is assisted, so that the whole structure is compact, the volume is small, the weight is light, and the device is suitable for field calibration;
2) the interface module 01 can replace a proper measuring component 3 according to the measuring range and the precision of the detected pressure instrument, or switch between the high-pressure measuring component 31 and the low-pressure measuring component 32 by controlling the high-low pressure switching valve 42, so that the adaptability is good, and the detection precision is ensured; the spiral dehumidifying and filtering unit 5 is used to perform dehumidifying and filtering process on the input pressure gas to form clean and dry pressure gas and prevent the liquid remained in the tested pressure instrument from entering the gas pressure control mechanism 100 of the present invention through the interface module.
3) The micro gas pressure generating mechanism 04 is formed by integrating the vibration reduction support base 401 and the micro piston type air pump together, and has a vibration reduction structure, the mechanism realizes the output of gas pressure under the condition of avoiding the influence of vibration on other components, and the mechanism has a simple structure, small volume and light weight;
4) the pressure connection platform 05 is connected in an inserting mode, the pressure connection platform 05 adopts a structure suitable for mounting and placing a detected pressure instrument, output pressure gas is led into the detected pressure instrument, and the pressure connection platform is simple to maintain and convenient to operate; two pressure detection interfaces are arranged, so that two detected pressure instruments can be verified at the same time, and the verification efficiency is improved;
5) the two-position two-way electromagnetic valve and the two-position three-way electromagnetic valve provided by the invention adopt the first sealing element 607 to replace the existing electromagnetic valve island, the process of opening a channel is omitted, the first sealing element 607 can be directly clamped on the electromagnetic valve, the assembly is convenient, and the volume is small; the air vent setting of this solenoid valve can set up a plurality ofly in the circumference of first sealing member 607, and can the direct mount on the disk seat that corresponds for the gas circuit pipeline design is more nimble.
It will be understood by those skilled in the art that these examples or embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention, and that various equivalent modifications and changes may be made to the present invention without departing from the spirit of the present disclosure.
Claims (20)
1. The utility model provides a gas circuit subassembly, its characterized in that, the gas circuit subassembly is used for the pressure check gauge, the gas circuit subassembly includes:
the gas pressure control mechanism (100) comprises an interface module (01), a control execution module (02) and a control module (03) for controlling the interface module (01) and the control execution module (02), wherein the interface module (01) is communicated with the control execution module (02) through a gas path;
the micro gas pressure generating mechanism (04) is used for providing a gas source for the gas pressure control mechanism (100);
the control execution module (02) responds to a control instruction of the control module (03), controls a gas source provided by the micro gas pressure generating mechanism (04) to a target pressure value, and transmits the gas at the target pressure value to the interface module (01) through a gas path;
the interface module (01) responds to an output instruction of the control module (03) and outputs the gas with the target pressure value.
2. The air circuit assembly of claim 1, wherein the micro gas pressure generating mechanism (04) comprises a micro piston type air pump, a vibration damping support base (401), an interface unit (405), and a gas connection pipeline (404) for connecting the micro piston type air pump and the interface unit, the vibration damping support base (401) comprises an upper support plate (411), a lower support plate (412), and a plurality of elastic supports (414) connecting peripheries of the upper support plate and the lower support plate, and a central vibration absorber (413) installed between the upper support plate and the lower support plate, the plurality of elastic supports (414) are arranged at intervals in a circumferential direction of the upper support plate and the lower support plate, and the central vibration absorber (413) is arranged in a middle portion of the upper support plate (411) to define upper limit position and lower limit position of vibration of the upper support plate.
3. The air path assembly of claim 2 wherein said central vibration absorber (413) comprises:
the limiting sleeve (4131) is of a hollow sleeve structure, the cylinder wall at the opening of the upper end of the limiting sleeve extends inwards to form an inwards-contracted closing-in, the bottom of the limiting sleeve extends outwards to form an outer step, and the bottom of the outer step is tightly attached and fixed with the lower supporting plate (12);
the limiting column (4132) is of an inverted T-shaped structure and comprises a horizontal plate and a vertical column, the upper part of the vertical column is fixed on the upper supporting plate (411), the lower part of the vertical column extends into the limiting sleeve (4131), and the diameter of the horizontal plate is larger than that of the upper part closing-in of the limiting sleeve (4131); and
and the elastic damping element (4133) is sleeved on the vertical column of the limiting column (4132) and limited between the upper supporting plate (411) and the horizontal plate of the limiting column (4132).
4. The air channel assembly according to claim 2 or 3, wherein the elastic support (414) is a double-coil reverse spring structure, and comprises a double-coil spring (4141) which is reversely arranged, the lower parts of the double-coil spring (4141) are connected, the connected parts form a circular arc-shaped groove (4143), the upper parts are separated to form an interface (4142), and the end part of the interface is provided with a bent part (4144).
5. The air circuit assembly of any one of claims 2 to 4, wherein the micro-piston air pump is mounted on a vibration damping support base, comprising:
a cylinder-piston unit (403) comprising a cylinder (31) and a piston assembly (432) located within the cylinder; the transmission driving unit (402) comprises a motor (421), a synchronous belt speed reducing mechanism (422) and a crank block mechanism, wherein the synchronous belt speed reducing mechanism (422) is matched with the crank block mechanism to convert the rotary motion output by the motor (421) into the linear motion for driving the piston assembly (432) to reciprocate in the cylinder body (431);
the motor (421) and the cylinder (431) are installed on the upper supporting plate (411) of the vibration damping supporting base (401), and the motor (421) is positioned on one side of the cylinder (431) to form a stable triangular structure.
6. The air circuit assembly according to any one of claims 2 to 5, wherein the interface unit (405) is arranged on a lower support plate (412) of the vibration damping support base (401), and an air connecting pipeline (404) for connecting a high-pressure air outlet of the micro piston type air pump and an air output interface (452) is a high-pressure elastic pipeline (442) which is made of a thin stainless steel pipe bent into a spiral spring shape.
7. The gas circuit assembly according to any one of claims 1 to 6, wherein the control module (03) comprises a control circuit board (031), and the control circuit board (031) is connected in series with a solenoid valve in a gas circuit of the control execution module (02) in a controlled manner to be powered on or off so as to control the pressure gas input by the micro gas pressure generating mechanism (04) to flow in order in the gas circuit of the control execution module (02) and further control the pressure gas to be at a predetermined pressure value and output from the interface module (01), wherein the interface module (1) comprises a fixed support unit (1) in which a gas pipeline system (2) is arranged, and a gas input pipeline (25) of the gas pipeline system (2) is communicated with a gas output pipeline (26) through a spiral dehumidification filter unit (5);
the spiral dehumidifying filter unit (5) comprises:
the liquid storage cylinder (51) is arranged on the fixed supporting unit (1), and a spiral groove (511) is formed in the inner wall of the liquid storage cylinder and extends upwards from the bottom;
the bottom of the central breather pipe (52) is communicated with the gas input pipeline (25), and the top of the central breather pipe penetrates through the bottom of the liquid storage cylinder (51) and extends to the upper part of the liquid storage cylinder; and
the middle part of the isolating umbrella (53) is hermetically buckled with the upper end of the central vent pipe (52), one side of the isolating umbrella is provided with a lateral through hole (531) communicated with the central vent pipe (52), and a gap is arranged between the umbrella-shaped edge of the isolating umbrella (53) and the inner wall of the liquid storage cylinder (51).
8. The air channel assembly according to claim 7, wherein the gas output pipeline (26) is arranged on one side of the lower part of the liquid storage cylinder (51) and communicated with the inside of the liquid storage cylinder; one end of a liquid drainage pipeline (24) in the gas pipeline system (2) is arranged at the bottom of the liquid storage cylinder (51) and communicated with the inside of the liquid storage cylinder, the other end of the liquid drainage pipeline is communicated with the atmosphere, and a liquid drainage electromagnetic valve (4) is connected on the liquid drainage pipeline (24) in series.
9. The air channel assembly according to claim 7 or 8, wherein the interface module (01) further comprises one or more measuring assemblies (3), the measuring assemblies (3) are used as air pressure measuring units and are mounted on the side surface of the fixed supporting unit (1) and exposed, and the measuring assemblies (3) are electrically connected to the control circuit board (031).
10. The gas circuit assembly according to any one of claims 7 to 9, wherein the measuring assemblies (3) are provided in two, including a high pressure measuring assembly (31) and a low pressure measuring assembly (32), the high pressure measuring assembly (31) is communicated with the gas input pipeline (25) through a high pressure measuring pipeline (22); the low-pressure measuring assembly (32) is communicated with the gas input pipeline (25) through a low-pressure measuring pipeline (23), and the low-pressure measuring pipeline (23) is connected with a high-pressure and low-pressure switching valve (7) in series so as to control the on-off of the low-pressure measuring assembly (32) and the gas input pipeline (25).
11. The air channel assembly according to any one of claims 7 to 10, wherein the control execution module (02) is provided with a valve seat (7), the valve seat (7) comprises an air-volume cavity (71) provided with a positive-pressure air volume (711), a negative-pressure air volume (712) and a positive-negative pressure output pipeline (84), a positive-pressure valve seat (72) provided with a positive-pressure air distribution pipeline (81) therein and a negative-pressure valve seat (73) provided with a negative-pressure air distribution pipeline (82) therein, the positive-pressure air volume (711) is communicated with the output port of the micro-gas pressure generating mechanism (04) through the positive-pressure air distribution pipeline (81) and is communicated with the gas input channel (25) of the interface module (01) through the positive-negative pressure output pipeline (84), the negative pressure air volume (712) is communicated with the input port of the micro gas pressure generating mechanism (04) through a negative pressure air distribution pipeline (82) and is communicated with the gas input channel (25) of the interface module (01) through a positive pressure output pipeline (84).
12. The air circuit assembly of claim 11, wherein the positive pressure air distribution pipeline (81) is communicated with the positive pressure air container (711) through a second solenoid valve (V2) and communicated with a liquid discharge pipeline (24) arranged in the interface module (01) through a first solenoid valve (V1); the negative pressure air distribution pipeline (82) is communicated with the negative pressure air capacitor (712) through a fourth electromagnetic valve (V4), the fourth electromagnetic valve (V4) is a three-way electromagnetic valve, a normally closed channel of the three-way electromagnetic valve is connected in series with the negative pressure air distribution pipeline (82), and a normally open channel of the three-way electromagnetic valve is communicated with the atmosphere through an air inlet (94) formed in the bottom of a negative pressure valve seat (73).
13. The air channel assembly as claimed in claim 11 or 12, wherein the positive and negative pressure output pipeline (84) is communicated with the positive pressure air volume (711) through a third solenoid valve (V3) and is communicated with the negative pressure air volume (712) through a sixth solenoid valve (V6) and a fifth solenoid valve (V5) in sequence, the fifth solenoid valve (V5) is a three-way solenoid valve, a normally closed channel of the three-way solenoid valve is connected between the negative pressure air volume (712) and the positive and negative pressure output pipeline (84) in series, and a normally open channel of the five-way solenoid valve is connected to the liquid discharge pipeline (24) arranged in the interface module (01).
14. The air circuit assembly of claim 12 or 13, wherein the three-way solenoid valve comprises:
an electromagnetic coil (601);
a sleeve (602) fixedly disposed within the battery coil (601);
a fixed iron core (603) fixedly sleeved in the sleeve (602);
the movable iron core (604) is movably sleeved in the sleeve and positioned below the fixed iron core, the upper end of the movable iron core is provided with a blind hole (641) for accommodating the first spring (605), and the first spring (605) is always in a compressed state; and
the first sealing element (607) and the second sealing element (611) are connected to form a sealing element with an internal invariable cavity, and the sealing element is clamped at the lower end of the sleeve (602);
a matching structure formed by a sealing gasket (616) and a valve core (614) provided with a second spring is arranged in the invariable cavity of the sealing member, and the matching structure can move in the same direction along with the movement of the movable iron core (604), so that a lateral second pressure port (610) arranged on the first sealing member (607) is communicated with one of a first pressure port (609) arranged at the upper bottom of the first sealing member (607) and a third pressure port (613) arranged on the second sealing member (611).
15. The gas pressure calibrator according to any one of claims 11 to 14, wherein the control execution module (02) further comprises a pressure sensor assembly (10) serving as a gas pressure measurement unit, the pressure sensor assembly (10) is electrically connected to the control circuit board (031) and a detection probe thereof extends into the gas chamber body (71) to sense a gas pressure value in the chamber body.
16. A gas pressure prover, comprising:
a housing (500);
the air circuit assembly of any one of claims 1 to 15 mounted within a housing (500);
a touch display screen (400) for displaying, measuring and inputting operations;
an electrical measurement assembly (600); and
an interface board (300) for accessing a power module (700).
17. The gas pressure calibrator according to claim 16, wherein the housing (500) comprises a lower shell (510), an upper shell (520) and a flip (530), and a rectangular through slot is formed at the top of the upper shell (520); the turnover cover (530) can rotatably cover the rectangular through groove of the upper shell (520), and the upper shell (520), the lower shell (510) and the turnover cover (530) are buckled to form a cavity structure; a mounting rack (08) is arranged in the inner space of the cavity, the air channel assembly and the circuit component are assembled in the mounting rack (08), and the power supply module (700) is detachably mounted at the bottom of the lower shell (510).
18. The gas pressure calibrator according to claim 17, wherein an isolation hood (084) is arranged inside the mounting frame (08), the isolation hood (084) and the first side plate (082) and the second side plate (083) on two sides of the mounting frame divide the inside of the mounting frame (08) into two areas, namely a first mounting area (085) and a second mounting area (086), a first guide rail groove (0851) and a second guide rail groove (0861) are respectively arranged at the bottoms of the first mounting area (085) and the second mounting area (086), and a gas path connecting base (088) is arranged at the rear end of the mounting frame (08); the gas pressure control mechanism (100) is pushed into the first mounting area (085) along the first guide rail groove (0851), the miniature gas pressure generating mechanism (04) is pushed into the second mounting area (086) along the second guide rail groove (0861), the isolation cover (084) wraps the miniature gas pressure mechanism (04), and interfaces of the gas pressure control mechanism (100) and the miniature gas pressure generating mechanism (04) are connected with corresponding gas circuit connecting holes arranged on the gas circuit connecting base in an inserting mode.
19. A gas pressure verifier according to claim 17 or 18, wherein:
the two ends of the bottom of the lower shell (510) are provided with an exhaust port (5101) and a wind shield (5102) for exhausting hot air in the cavity, an air suction port (5103) for sucking cold air, an air path exhaust groove (5104) and a filter (5105), the cold air is sucked from the air suction port (5103), one part of the cold air sequentially enters the micro gas pressure generating mechanism (04) through the air path exhaust groove (5104) and the filter (5105), the other part of the cold air flows and rises to enter a cold air hole (0841) of an isolation cover (084) in the shell to cool the micro gas pressure generating mechanism (04), the generated hot air is exhausted from an exhaust fan (0862) arranged on the mounting frame (08), and the exhaust fan (0862) corresponds to the exhaust port (5103).
20. A gas pressure verifier according to any one of claims 17 to 19, wherein:
the flip cover (530) is hinged on one side of the top of the mounting rack (08) through a damping shaft, can rotate around the damping shaft and is kept, and the touch display screen (400) is mounted on the inner side of the flip cover (530); the periphery of the lower shell (510) is provided with an elastic anti-collision bulge (5106).
Priority Applications (1)
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| CN201910674956.2A CN112304494A (en) | 2019-07-25 | 2019-07-25 | Gas circuit assembly and gas pressure calibrator |
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| CN201910674956.2A CN112304494A (en) | 2019-07-25 | 2019-07-25 | Gas circuit assembly and gas pressure calibrator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114518131A (en) * | 2022-04-20 | 2022-05-20 | 广州市星康科技有限公司 | Dustproof shell for mounting lock joint type sensor |
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