CN115266164A - Piston type gas injection device - Google Patents

Abstract

The invention provides a piston type gas injection device. The piston type gas injection device includes: the volume and the maximum injection flow of the at least two injection cylinders are different; detecting a pipeline; the detection pipeline is used for connecting the tested equipment, and the air source pipeline is used for connecting an air source; any one of the at least two injection cylinders is selectively communicated with the detection pipeline or the air source pipeline. The piston type gas injection device provided by the technical scheme of the invention can meet the gas injection requirements of different gas injection flow and precision requirements.

Description

Piston type gas injection device

Technical Field

The invention relates to the technical field of gas injection equipment, in particular to a piston type gas injection device.

Background

With the development of science and technology, modern industrial production and manufacturing technology has advanced greatly, but gas still plays an indispensable role in industrial fields, such as chemical industry, medicine, metallurgy, electronics, energy and other fields, which require various gases such as hydrogen, oxygen, nitrogen, argon and the like.

Generally, industrial gas equipment has different requirements on the pressure and flow rate of different gases, and particularly, the requirement on the pressure is generally greatly different from the pressure of a gas source, so that the industrial gas equipment cannot be directly supplied with gas from the gas source, and the industrial gas equipment is generally supplied with gas through a gas distribution device.

Generally, industrial gas equipment has different requirements on the pressure and flow rate of different gases, and particularly, the requirement on the pressure is generally greatly different from the pressure of a gas source, so that the industrial gas equipment cannot be directly supplied with gas from the gas source, and the industrial gas equipment is generally supplied with gas through a gas distribution device. The existing gas flow meters all have the problem that the application range is limited, the gas flow injection range and the precision of a single gas flow meter are greatly limited, and the calibration requirements of different types of equipment for receiving injected gas are difficult to meet.

Disclosure of Invention

The invention mainly aims to provide a piston type gas injection device which can meet the gas injection requirements of different gas injection flow and precision requirements.

In order to achieve the above object, according to one aspect of the present invention, there is provided a piston-type gas injection apparatus including: the volume and the maximum injection flow of the at least two injection cylinders are different; detecting a pipeline; the detection pipeline is used for connecting the detected equipment, and the gas source pipeline is used for connecting a gas source; any one of the at least two injection cylinders can be selectively communicated with the detection pipeline or the air source pipeline.

Further, the piston type gas injection device further comprises a control valve group, wherein the control valve group is connected among the injection cylinder, the detection pipeline and the gas source pipeline, and enables the injection cylinder to be selectively communicated with the detection pipeline and the gas source pipeline.

Further, the control valve group includes: the first valves are arranged in one-to-one correspondence with the injection cylinders and are connected with the injection cylinders, each first valve is provided with two gas interfaces which can be selectively communicated with the injection cylinders, and one of the gas interfaces of each first valve is used for being communicated with the outside air; the first ends of the first air pipes are connected with the other air interface of the corresponding first valve; the at least two second valves are arranged in one-to-one correspondence with the first air pipes, and the second valves are connected with the second ends of the first air pipes; and when the air source pipeline is communicated with one second valve, the air source pipeline is not communicated with other second valves.

Furthermore, a control valve is arranged on the air source pipeline, when the first valve is communicated with the first air pipe, the second valve is opened, and the control valve opens the air source pipeline; when the first valve is communicated with the outside air, the second valve is opened, and the control valve closes the air source pipeline.

Further, the control valve group includes: at least two third valves which are arranged corresponding to the injection cylinders one by one, and the detection pipeline is connected with the third valves and is selectively communicated with each third valve; and the at least two second air pipes are arranged in one-to-one correspondence with the injection cylinders and are connected between the corresponding injection cylinders and the third valve.

Further, the piston-type gas injection-out apparatus further comprises: a base; a first fixing plate; a guide plate; and a drive mechanism; the at least two injection air cylinders comprise cylinder bodies and cylinder rods, the first ends of the cylinder bodies are fixedly mounted on the base, the first fixing plates are fixedly connected to the second ends of the cylinder bodies, the movable ends of the cylinder rods are connected to the guide plates together, the driving mechanisms are mounted on the first fixing plates, the driving ends of the driving mechanisms are in driving connection with the guide plates, and the guide plates are driven to move towards the direction far away from or close to the first fixing plates.

Furthermore, the piston type gas injection device also comprises a second fixing plate, the second fixing plate is fixedly connected with the first fixing plate through a guide rod, and the guide plate is slidably arranged along the guide direction of the guide rod.

Furthermore, the driving mechanism comprises a driving motor and a driving screw rod, the first end of the driving screw rod is connected to the output end of the driving motor, the second end of the driving screw rod is connected with the second fixing plate and circumferentially rotates relative to the second fixing plate, the axial position of the driving screw rod is fixed, the guide plate is in threaded driving connection with the driving screw rod, and the driving motor is installed on one side, away from the second fixing plate, of the first fixing plate and located between at least two cylinder bodies of the injection cylinder.

Furthermore, the strokes of at least two injection cylinders are the same, and the cylinder rod is connected with the guide plate through a floating joint; and/or the at least two injection cylinders comprise a first cylinder, a second cylinder, a third cylinder and a fourth cylinder, the injection volume range of the first cylinder is [0, A ], and the injection volume range of the second cylinder is [0, B ]; the injection volume range of the third cylinder is [0, C ]; the injection volume range of the fourth cylinder is [0, D ], wherein A is more than B and more than C and less than D.

Further, a stroke monitoring device is fixedly arranged between the first fixing plate and the second fixing plate, and the stroke monitoring device is configured to monitor the stroke of the guide plate.

By applying the technical scheme of the invention, the detection pipeline, the gas source pipeline and the plurality of the injection cylinders with different volumes and maximum injection flow rates are arranged, and the detection pipeline and the gas source pipeline are selectively communicated with at least two injection cylinders, so that when gas is injected, a worker can control the gas source pipeline and the detection pipeline to be communicated with the appropriate injection cylinders according to the injection flow rate and the injection precision requirements, and simultaneously, the injected gas passes through the detection pipeline and is output through the one-way output connector to calibrate the tested equipment, thereby reducing the consumption of gas sources and meeting the gas injection requirements of different gas injection flow rates and precision requirements.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 shows a perspective view of a piston-type gas-pouring device of an embodiment of the present invention;

fig. 2 is a schematic view showing the overall structure of a piston-type gas-pouring apparatus of the embodiment of the present invention; and

fig. 3 shows a schematic view of a piston-type gas-pouring device of an embodiment of the present invention.

Wherein the figures include the following reference numerals:

10. an injection cylinder; 10a, a first cylinder; 10b, a second cylinder; 10c, a third cylinder; 10d, a fourth cylinder; 11. a base; 12. a first fixing plate; 13. a guide plate; 14. a drive mechanism; 15. a cylinder body; 16. a cylinder rod; 17. a second fixing plate; 18. a guide bar; 19. a drive motor; 20. detecting a pipeline; 21. driving the screw rod; 22. a trip monitoring device; 23. a proximity switch; 30. a gas source pipeline; 40. a second air pipe; 50. a control valve; 60. a first valve; 70. a first air pipe; 80. a second valve; 81. a third valve; 90. a pressure sensor.

Detailed Description

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

Referring to fig. 1 to 3 in combination, the present invention provides a piston-type gas injection apparatus including: at least two injection cylinders 10, the volumes and maximum injection flow rates of the at least two injection cylinders 10 are different; a detection line 20; the detection pipeline 20 is used for connecting the tested equipment, and the air source pipeline 30 is used for connecting an air source; any one of the at least two shooting-out cylinders 10 is selectively in communication with the sensing line 20 or the air supply line 30.

In the above technical solution, the piston type gas injection device includes at least two injection cylinders 10, and further includes a detection pipeline 20 for connecting the device to be tested, and an air source pipeline 30 for connecting an air source, where the volumes and maximum injection flows of the at least two injection cylinders 10 are different, and the detection pipeline 20 and the air source pipeline 30 are both selectively communicated with the at least two injection cylinders 10. When gas is injected, a worker can control the gas source pipeline 30 and the detection pipeline 20 to be communicated with the appropriate injection cylinder 10 according to the injection flow and the injection precision requirements, so that the gas injection requirements of different gas injection flow and precision requirements can be met.

In one embodiment, the detection pipeline 20 is provided with a check valve for preventing the detection gas from reversely flowing back from the device under test, that is, when the detection pipeline 20 is communicated with the device under test, the gas flow in the device under test can be prevented from reversely flowing back to the injection cylinder 10 through the detection pipeline 20 to cause gas flow fluctuation, so that the flowing stability of the gas flow is ensured, and the calibration accuracy is further improved.

It should be noted that, in the embodiment of the present invention, the piston type gas injection device uses the cylinder to inject gas, and can inject gas at a set volume flow rate and a set mass flow rate, and does not need to be periodically calibrated like a common measuring device.

As shown in fig. 3, in one embodiment of the present invention, the piston-type gas injection apparatus further includes a control valve block connected between the injection cylinder 10, the detection line 20, and the gas source line 30, and enabling the injection cylinder 10 to selectively communicate with the detection line 20 and the gas source line 30.

Through the arrangement, the injection cylinder 10 can be communicated with the detection pipeline 20 or the gas source pipeline 30, so that the pressure of the injected gas can be monitored in real time and the gas can be injected.

As shown in fig. 3, in one embodiment of the present invention, a control valve assembly includes: at least two first valves 60, which are arranged in one-to-one correspondence with the pouring out cylinder 10 and connected thereto, wherein the first valves 60 have two gas ports selectively communicated with the pouring out cylinder 10, and one of the gas ports of the first valves 60 is used for communicating with the outside air; at least two first air pipes 70, which are arranged corresponding to the first valves 60 one by one, wherein the first ends of the first air pipes 70 are connected with the other air interface of the corresponding first valve 60; at least two second valves 80, which are arranged corresponding to the first air pipes 70 one by one, wherein the second valves 80 are connected with the second ends of the first air pipes 70; when the air supply line 30 is connected to one of the second valves 80, it is not connected to the other second valves 80. In the above technical solution, the first valve 60 has two gas ports selectively communicated with the pouring cylinder 10, and one of the gas ports of the first valve 60 is used for communicating with the outside air, so that when the pouring cylinder 10 communicates with the gas port, the pouring cylinder 10 communicates with the atmosphere. The first end of the first air pipe 70 is connected to the other air port of the corresponding first valve 60, so that the two air ports of the first valve 60 can be selectively opened or closed to control whether the corresponding pouring cylinder 10 is communicated with the first air pipe 70. The opening and closing of the second valves 80 can control whether the corresponding injection cylinders 10 are communicated with the gas source pipeline 30, and when the gas source pipeline 30 is communicated with one of the second valves 80, the gas source pipeline is not communicated with other second valves 80, at this time, the gas interface, connected with the first gas pipe 70, of the first valve 60 on the first gas pipe 70 corresponding to the second valve 80 needs to be controlled to be opened, so that the injection cylinders 10 are not communicated with the atmosphere to be used as working cylinders for gas injection, and the gas interfaces, communicated with the atmosphere, of the first valves 60 on the first gas pipes 70 corresponding to other second valves 80 are controlled to be opened, so that other injection cylinders 10 are communicated with the atmosphere and are not used as working cylinders, and further, the cylinders with different specifications can be freely switched as the working cylinders or the non-working cylinders, so that the gas injection requirements of different gas injection flow rates and accuracy can be met.

In one embodiment of the present invention, the control valve 50 is a normally closed two-position three-way valve, the second valve 80 is a pallet plate type direct-acting solenoid valve, and the first valve 60 is a normally open two-position three-way valve.

As shown in fig. 3, in an embodiment of the present invention, a control valve 50 is disposed on the gas source line 30, and when the first valve 60 is communicated with the first gas pipe 70, the second valve 80 is opened, and the control valve 50 opens the gas source line 30; when the first valve 60 is communicated with the outside air, the second valve 80 is opened, the control valve 50 closes the air source pipeline 30, the control valve 50 loses power when the gas is injected from the injection cylinder 10 to the detection pipeline 20, the air source pipeline 30 is closed, and the air source is powered on when the gas is injected from the air source to the injection cylinder 10, and the air source pipeline 30 is opened. In the above technical solution, the first valve 60 is a normally open two-position three-way valve, so when the first valve 60 is de-energized, the first valve 60 controls the first air pipe 70 to communicate with the injection cylinder 10, and the atmosphere is not communicated with the injection cylinder 10; when the first valve 60 is powered, the first valve 60 controls the first air pipe 70 not to be communicated with the injection cylinder 10, and the atmosphere is communicated with the injection cylinder 10. The control valve 50 is a normally closed two-position three-way valve, when the first valve 60 controls the first air pipe 70 to be communicated with the injection cylinder 10, the second valve 80 is opened, the control valve 50 on the air source pipeline 30 is electrified, so that the air source pipeline 30 is in a passage state, the injection cylinder 10 is communicated with the air source pipeline 30, and the air source can inject air into the injection cylinder 10; when the first valve 60 controls the communication between the outside air and the injection cylinder 10, the second valve 80 is opened, the control valve 50 is de-energized, and the air source pipeline 30 is closed, at this time, the injection cylinder 10 is communicated with the outside air and does not serve as a working cylinder; and when the gas is injected into the detection pipeline 20 by the injection cylinder 10, the control valve 50 is in a state of closing the gas source pipeline 30, at this time, the injection cylinder 10 is not communicated with the gas source pipeline 30, and the gas is injected into the detection pipeline 20 by the injection cylinder 10 to perform real-time monitoring on the pressure of the injected gas.

In one embodiment of the present invention, at least two first valves 60 are integrated into one valve block, and at least two second valves 80 are integrated into one valve block. Can enough reduce installation space like this, make the device structure compacter, can also realize the switching of different gas volumes of annotating and annotating out the precision through freely switching a plurality of cylinders and control flap 50 or second trachea 40 connected state, and then satisfy more and annotate the demand, improve the suitability of device.

As shown in fig. 3, in one embodiment of the present invention, a control valve assembly includes: at least two third valves 81 disposed in one-to-one correspondence with the out-feeding cylinders 10, the sensing lines 20 being connected to the third valves 81 and selectively communicated with the respective third valves 81; and at least two second air pipes 40 provided in one-to-one correspondence with the pour-out cylinders 10, the second air pipes 40 being connected between the corresponding pour-out cylinders 10 and the third valves 81.

In one embodiment of the present invention, the third valve 81 is a plate-type direct-acting solenoid valve.

In the above technical solution, the detection pipeline 20 is connected to the third valves 81 and selectively communicated with each third valve 81, the second air pipe 40 is connected between the corresponding ejecting cylinder 10 and the third valve 81, when gas detection needs to be performed on a certain ejecting cylinder 10, the third valve 81 corresponding to the ejecting cylinder 10 needs to be opened, the third valves 81 corresponding to other ejecting cylinders 10 are closed, and the detection pipeline 20 is communicated with the third valve 81 corresponding to the to-be-detected ejecting cylinder 10, so that real-time monitoring of the ejecting gas pressure of the to-be-detected ejecting cylinder 10 is realized, and stability of gas ejection is ensured.

Specifically, in an embodiment of the present invention, the pressure sensor 90 is disposed at the discharge end of each detection pipeline 20, so that the pressure of the discharged gas can be monitored in real time, and thus, the controller can correct the discharge speed according to the feedback data of the pressure sensor 90, thereby ensuring the stability of gas discharge.

As shown in fig. 2, in one embodiment of the present invention, the piston-type gas injection apparatus further comprises: a base 11; a first fixing plate 12; a guide plate 13; and a drive mechanism 14; the at least two injection cylinders 10 comprise cylinder bodies 15 and cylinder rods 16, wherein a first end of each cylinder body 15 is fixedly arranged on the base 11, the first fixing plate 12 is fixedly connected to a second end of each cylinder body 15, movable ends of the cylinder rods 16 are jointly connected to the guide plate 13, the driving mechanism 14 is arranged on the first fixing plate 12, a driving end of the driving mechanism 14 is in driving connection with the guide plate 13, and the guide plate 13 is driven to move towards a direction far away from or close to the first fixing plate 12.

In the above technical solution, the cylinder body 15 is fixedly installed between the base 11 and the first fixing plate 12, and under the driving of the driving motor 19, the guide plate 13 can drive the cylinder rod 16 to move towards the direction far away from or close to the cylinder body 15, so as to achieve air suction and air injection.

It should be noted that, in an embodiment of the present invention, a proximity switch 23 is installed on the first fixing plate 12, and when the guide plate 13 contacts the proximity switch 23, a zero position is reached, at which all the gas injected into the cylinder 10 is exhausted, and the controller may control the driving motor 19 to stop according to a feedback signal of the proximity switch 23, so as to stop the movement of the cylinder rod 16.

As shown in fig. 2, in one embodiment of the present invention, the piston type gas injection apparatus further includes a second fixing plate 17, the second fixing plate 17 is fixedly connected to the first fixing plate 12 by a guide rod 18, and the guide plate 13 is slidably disposed along a guide direction of the guide rod 18.

In the above technical solution, the second fixing plate 17 is fixedly connected with the first fixing plate 12 through the guide rod 18, and the guide plate 13 is slidably disposed along the guide direction of the guide rod 18, so that the guide rod 18 can limit the guide plate 13 in the horizontal direction, and the cylinder rod 16 is more stable in movement in the vertical direction and will not move.

As shown in fig. 2, in an embodiment of the present invention, the driving mechanism 14 includes a driving motor 19 and a driving screw 21, a first end of the driving screw 21 is connected to an output end of the driving motor 19, a second end of the driving screw 21 is connected to the second fixing plate 17 and is circumferentially rotated and axially fixed relative to the second fixing plate 17, the guide plate 13 is in threaded driving connection with the driving screw 21, and the driving motor 19 is installed on a side of the first fixing plate 12 away from the second fixing plate 17 and is located between the cylinders 15 of the at least two injection cylinders 10.

Through the arrangement, under the driving action of the driving motor 19, the guide plate 13 moves along the driving screw rod 21 in the vertical direction, so as to drive the cylinder rod 16 to move in the vertical direction, and air suction and exhaust are realized. The driving motor 19 is positioned between the cylinder bodies 15 of the at least two injection cylinders 10, so that the overall structural stability of the device can be ensured, the installation space can be saved, and the structure is more compact.

As shown in fig. 2, in one embodiment of the present invention, at least two of the ejecting cylinders 10 have the same stroke and different diameters, and the cylinder rod 16 is connected to the guide plate 13 through a floating joint, so that the volumes and flow rates of the ejected gas are different when the different ejecting cylinders 10 operate the same stroke. In this embodiment, the stroke of each injection cylinder 10 is the same, the injection speed is the same, the volume is different, the injection flow is different when the synchronous injection is performed, the working environment of each injection cylinder 10 is the same, and the operation action is the same, so the operation consistency is good, and the calibration consistency to different tested devices is good under various working conditions.

In this embodiment, the cylinders with different specifications are used as the injecting cylinder 10, and a plurality of cylinders with different specifications can be selected for injecting gas, so that gas injection in different flow ranges can be realized. The piston type gas injection device has the advantages that the cylinders with different specifications are combined, so that high-precision micro-flow gas injection can be realized by using the small-volume small-flow cylinders, micro-flow can be quantitatively injected with higher precision, the requirement of high-precision micro-flow gas injection equipment is met, meanwhile, the defect that the flow range of the small-volume small-flow cylinders is limited and gas injection outside the flow range cannot be realized can be overcome by using other cylinders, the piston type gas injection device can realize gas injection within the large flow range, and the injection precision of micro-flow gas can be effectively improved.

In one embodiment, the at least two shooting-out cylinders 10 include a first cylinder 10a, a second cylinder 10b, a third cylinder 10c, and a fourth cylinder 10d, the shooting-out volume range of the first cylinder 10a is [0, a ], the shooting-out volume range of the second cylinder 10b is [0, b ]; the third cylinder 10c has a discharge volume range of [0, C ]; the fourth cylinder 10D has a discharge volume range [0, D ], where A < B < C < D.

Among the above-mentioned technical scheme, the first cylinder 10a, second cylinder 10b, third cylinder 10c and fourth cylinder 10 d's volume is different, and gaseous the biggest flow of spouting is different, and like this, the equipment of spouting can cover the volume demand of spouting of a plurality of gradients to effectively improve the suitability of device.

It should be noted that, in an embodiment of the present invention, the discharge accuracy of the first cylinder 10a is c1, the maximum discharge flow is 29ml/min, the discharge accuracy of the second cylinder 10b is c2, the maximum discharge flow is 150ml/min, the discharge accuracy of the third cylinder 10c is c3, the maximum discharge flow is 367ml/min, the discharge accuracy of the fourth cylinder 10d is c4, and the maximum discharge flow is 1034ml/min, the maximum discharge flow of the first cylinder 10a, the second cylinder 10b, the third cylinder 10c, and the fourth cylinder 10d increases progressively, and the discharge accuracy gradually decreases, that is, the smaller the maximum discharge flow of the four cylinders is, the higher the discharge accuracy is, and the larger the maximum discharge flow is, the lower the discharge accuracy is. When working cylinder's selection is being carried out, at first judge the cylinder that satisfies gas and annotate the flow demand, also judge that required gas is annotated the flow and is annotated whether in the biggest of cylinder and annotate the flow within range, if at, then satisfy gas and annotate the flow demand, otherwise, then unsatisfied gas and annotate the flow demand, after confirming the cylinder that satisfies gas and annotate the flow demand, can select the cylinder that the precision is the highest among these cylinders and carry out gas and annotate to improve gas and annotate the precision, improve equipment under test's calibration precision.

For example, when the required gas injection flow rate is 20ml/min, the first cylinder 10a, the second cylinder 10b, the third cylinder 10c, and the fourth cylinder 10d all satisfy the maximum injection flow rate requirement, but the injection accuracy c1 of the first cylinder 10a is higher than those of the second cylinder 10b, the third cylinder 10c, and the fourth cylinder 10d, and therefore, the first cylinder 10a is selected as the working cylinder to inject gas; when the required gas injection flow rate is 160ml/min, the maximum injection flow rate range of the first cylinder 10a and the second cylinder 10b is exceeded, so that neither the first cylinder 10a nor the second cylinder 10b can meet the required injection flow rate requirement, and the required gas injection flow rate is within the maximum injection flow rate range of the third cylinder 10c and the fourth cylinder 10d, but the injection accuracy c3 of the third cylinder 10c is higher than the injection accuracy c4 of the fourth cylinder 10d, so that the third cylinder 10c is selected as the working cylinder to inject gas, thereby better meeting the calibration requirement.

As shown in fig. 2, in one embodiment of the present invention, a stroke monitoring device 22 is fixedly disposed between the first fixing plate 12 and the second fixing plate 17, and the stroke monitoring device 22 is configured to monitor the stroke of the guide plate 13.

Through the arrangement, the motion path of the guide plate 13 can be monitored in real time, and the motion distance and the motion speed of the cylinder rod 16 of the cylinder are controlled to realize closed-loop control on the injection amount and the injection speed.

Preferably, in one embodiment of the present invention, the travel monitoring device 22 is a grating scale.

Specifically, the working process and the gas path cleaning process of the piston type gas injection device are as follows:

the working process is as follows: the system automatically selects a suitable out-injection cylinder 10, such as the first cylinder 10a, according to the gas injection amount; closing the first valve 60 on the second air pipe 40 of the first cylinder 10a, opening the second valve 80 on the first air pipe connected with the first cylinder 10a to make the first cylinder 10a as a working cylinder, simultaneously opening the first valves 60 on the second air pipes 40 of the rest of the injecting cylinders 10, namely, the second cylinder 10b, the third cylinder 10c and the fourth cylinder 10d, closing the second valve 80 on the first air pipe connected with the injecting cylinder 10 to make the second cylinder 10b, the third cylinder 10c and the fourth cylinder 10d all communicate with the atmosphere and not as a working cylinder; the driving motor 19 is started to drive the cylinder rod 16 of the air cylinder to extract air source gas; after the working cylinder is fully pumped, the control valve 50 switches the gas path to the exhaust mode, and the driving motor 19 is started to drive the cylinder rod 16 of the cylinder to exhaust the gas in the cylinder. Repeating the process for multiple times until all the non-gas source gas in the whole gas circuit and the cylinder is discharged, thereby ensuring the gas purity of the whole route; after the cleaning is finished, the driving motor 19 is started to drive the cylinder rod 16 to extract the gas source gas required to be injected, the control valve 50 switches the gas path to the exhaust mode, and the driving motor 19 is started to drive the cylinder rod 16 to exhaust the gas in the first cylinder 10a, so that the gas injection is finished.

When the injection of one gas is completed and another injection cylinder 10, such as the second cylinder 10b, needs to be switched to inject another gas, the switching process is as follows: opening a first valve 60 of a second air pipe 40 of the first air cylinder 10a, closing a second valve 80 of the first air pipe connected with the first air cylinder 10a, and communicating the first air cylinder 10a with the atmosphere, not serving as a working air cylinder; simultaneously closing a first valve 60 on a second air pipe 40 of the second air cylinder 10b, opening a second valve 80 arranged on the first air pipe connected with the second air cylinder 10b, enabling the second air cylinder 10b to be used as a working air cylinder, and repeating the gas cleaning process after switching is completed; starting the driving motor 19 to drive the cylinder rod 16 to extract the gas source gas with the required injection amount, and switching the gas path into an exhaust mode by the control valve 50; the driving motor 19 is started to drive the cylinder rod 16 of the air cylinder to discharge the air in the cylinder of the second air cylinder 10b, and the air injection is completed.

From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects: through setting up the detection pipeline, the gas source pipeline and a plurality of volume and the different notes cylinder of the biggest flow of annotating, and detection pipeline and gas source pipeline all optionally with two at least notes cylinder intercommunications, thus, when gaseous notes out, the staff can be according to annotating flow and annotating the precision demand, control gas source pipeline and detection pipeline and suitable notes cylinder intercommunication of annotating, and simultaneously, annotate gaseous through the detection pipeline and through one-way output joint output calibration equipment under test, can enough reduce the consumption of gas source, can also satisfy the gaseous notes demand of different gaseous notes flow and precision demands.

It is to be understood that the above-described embodiments are only a few, and not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise, and it should be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of features, steps, operations, devices, components, and/or combinations thereof.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A piston-type gas injection device, comprising:

at least two injection cylinders (10), the volume and the maximum injection flow of the at least two injection cylinders (10) being different;

a detection line (20); and

the gas source pipeline (30), the detection pipeline (20) is used for connecting the tested device, and the gas source pipeline (30) is used for connecting a gas source;

any one of the at least two injection cylinders (10) is selectively communicated with the detection pipeline (20) or the air source pipeline (30).

2. The piston-type gas injection apparatus according to claim 1, further comprising a control valve group connected between the injection cylinder (10), the detection line (20) and the gas source line (30) and enabling the injection cylinder (10) to be selectively communicated with the detection line (20) and the gas source line (30).

3. The piston-type gas injection apparatus according to claim 2, wherein said control valve group comprises:

at least two first valves (60) which are arranged in one-to-one correspondence with the injection cylinders (10) and are connected with each other, wherein the first valves (60) are provided with two gas interfaces which are selectively communicated with the injection cylinders (10), and one of the gas interfaces of the first valves (60) is used for being communicated with the outside air;

at least two first air pipes (70) which are arranged corresponding to the first valves (60) one by one, wherein the first ends of the first air pipes (70) are connected with the other gas interfaces of the corresponding first valves (60);

at least two second valves (80) which are arranged corresponding to the first air pipes (70) one by one, wherein the second valves (80) are connected with the second ends of the first air pipes (70);

when the air source pipeline (30) is communicated with one second valve (80), the air source pipeline is not communicated with other second valves (80).

4. The piston-type gas-pouring-out device according to claim 3, wherein a control valve (50) is provided on said gas source line (30), and when said first valve (60) is communicated with said first gas pipe (70), said second valve (80) is opened, and said control valve (50) opens said gas source line (30); when the first valve (60) is communicated with the outside air, the second valve (80) is opened, and the control valve (50) closes the air source pipeline (30).

5. The piston-type gas-pouring apparatus according to claim 2, wherein said control valve group comprises:

at least two third valves (81) which are arranged in one-to-one correspondence with the injection cylinders (10), wherein the detection pipelines (20) are connected to the third valves (81) and are selectively communicated with the third valves (81);

at least two second air pipes (40) are arranged in one-to-one correspondence with the injection cylinders (10), and the second air pipes (40) are connected between the corresponding injection cylinders (10) and the third valves (81).

6. The piston-type gas ejection device according to any one of claims 1 to 5, further comprising:

a base (11);

a first fixing plate (12);

a guide plate (13); and

a drive mechanism (14);

at least two notes cylinders (10) include cylinder body (15) and jar pole (16), the first end fixed mounting of cylinder body (15) on base (11), first fixed plate (12) fixed connection in the second end of cylinder body (15), the expansion end of jar pole (16) is connected to jointly deflector (13), actuating mechanism (14) are installed on first fixed plate (12), the drive end of actuating mechanism (14) with deflector (13) drive connection, the drive deflector (13) are towards keeping away from or being close to the direction motion of first fixed plate (12).

7. The piston-type gas injection apparatus according to claim 6, further comprising a second fixing plate (17), wherein the second fixing plate (17) is fixedly connected with the first fixing plate (12) through a guide rod (18), and the guide plate (13) is slidably disposed along a guide direction of the guide rod (18).

8. The piston-type gas injection device according to claim 7, wherein the drive mechanism (14) comprises a drive motor (19) and a drive screw (21), a first end of the drive screw (21) is connected to an output end of the drive motor (19), a second end of the drive screw (21) is connected to the second fixing plate (17) and is rotated circumferentially and fixed in axial position relative to the second fixing plate (17), the guide plate (13) is in threaded drive connection with the drive screw (21), and the drive motor (19) is mounted on a side of the first fixing plate (12) away from the second fixing plate (17) and is located between the cylinders (15) of the at least two injection cylinders (10).

9. The piston-type gas injection apparatus according to claim 6, wherein the strokes of said at least two injection cylinders (10) are the same, said cylinder rod (16) being connected to said guide plate (13) by a floating joint; and/or the at least two pouring cylinders (10) comprise a first cylinder (10 a), a second cylinder (10 b), a third cylinder (10 c) and a fourth cylinder (10 d), the pouring volume range of the first cylinder (10 a) is [0, A ], the pouring volume range of the second cylinder (10 b) is [0, B ]; the injection volume range of the third cylinder (10 c) is [0, C ]; the injection volume range of the fourth cylinder (10D) is [0, D ], wherein A is more than B and more than C and less than D.

10. The piston-type gas injection apparatus according to claim 7, wherein a stroke monitoring device (22) is fixedly provided between the first fixing plate (12) and the second fixing plate (17), the stroke monitoring device (22) being configured to monitor a stroke of the guide plate (13).

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