CN220339474U - Volume compensation device for upper and lower air chambers of piston cylinder - Google Patents
Volume compensation device for upper and lower air chambers of piston cylinder Download PDFInfo
- Publication number
- CN220339474U CN220339474U CN202322003169.XU CN202322003169U CN220339474U CN 220339474 U CN220339474 U CN 220339474U CN 202322003169 U CN202322003169 U CN 202322003169U CN 220339474 U CN220339474 U CN 220339474U
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- piston cylinder
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- meter
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- 230000000712 assembly Effects 0.000 claims abstract description 52
- 238000000429 assembly Methods 0.000 claims abstract description 52
- 239000007789 gas Substances 0.000 description 33
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 10
- 239000003345 natural gas Substances 0.000 description 5
- 238000012795 verification Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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Abstract
The utility model discloses a volume compensation device for an upper air chamber and a lower air chamber of a piston cylinder, which is mainly used for checking an ultrasonic gas meter. The device comprises at least two main piston cylinder assemblies, a compensation piston cylinder assembly, a detected meter air inlet pipeline and a detected meter air outlet pipeline, wherein cylinder barrels of the main piston cylinder assemblies are all fixed, piston rods of the main piston cylinder assemblies are all fixed on a movable plate capable of moving up and down, air interfaces of upper air chambers of the main piston cylinder assemblies are all connected with the detected meter air inlet pipeline, air interfaces of lower air chambers of the main piston cylinder assemblies are all connected with the detected meter air outlet pipeline, an ultrasonic gas meter connecting port is arranged between the detected meter air inlet pipeline and the detected meter air outlet pipeline, cylinder barrels of the compensation piston cylinder assemblies are fixed on the movable plate, piston rods of the compensation piston cylinder assemblies are fixed, and air interfaces of upper air chambers of the compensation piston cylinder assemblies are connected with the detected meter air outlet pipeline; the volume of the upper air chamber of the compensation piston cylinder assembly is the same as the sum of the volumes occupied by the piston rods of all the main piston cylinder assemblies in the cylinder bodies.
Description
Technical Field
The utility model relates to a volume compensation device for an upper air chamber and a lower air chamber of a piston cylinder, which is mainly used for checking an ultrasonic gas meter and belongs to the technical field of metering instruments.
Background
At present, the ultrasonic gas meter is widely applied to gas metering, and the accuracy requirement on the ultrasonic gas meter is higher and higher, so that the accuracy requirement on the flow verification device is higher and higher.
The detection accuracy of the meter can be improved by adopting an instantaneous flow method. Therefore, the inventor of the application designs an ultrasonic meter verification device, which uses a servo motor to drive a piston in a cylinder, circularly pushes natural gas to flow through a meter rack metering pipeline holding an ultrasonic meter to be tested in a closed space at accurate instantaneous flow, compares a theoretical flow value with an actual reading flow value of the meter under standard conditions, judges whether the ultrasonic meter is qualified or not, modifies an ultrasonic meter coefficient according to requirements, and performs verification on the ultrasonic meter.
If natural gas directly flows back and forth in the upper air chamber and the lower air chamber of the piston cylinder, the volume of the lower air chamber is smaller than that of the upper air chamber due to the piston rod, so that the temperature and the pressure of the natural gas change, various flow parameters of the ultrasonic gas meter are difficult to convert, and the ultrasonic gas meter cannot be used for analyzing data.
Disclosure of Invention
Aiming at the defects in the prior art, the utility model provides the volume compensation device for the upper and lower air chambers of the piston cylinder, which has a simple structure, can effectively compensate the difference of the volumes of the upper and lower air chambers of the piston cylinder and improves the verification precision.
The utility model is realized by the following technical scheme: a volume compensation device for upper and lower air chambers of a piston cylinder is characterized in that: the device comprises at least two main piston cylinder assemblies, a compensation piston cylinder assembly, a detected meter air inlet pipeline and a detected meter air outlet pipeline, wherein cylinder barrels of the main piston cylinder assemblies are all fixed, piston rods of the main piston cylinder assemblies are all fixed on a movable plate capable of moving up and down, air interfaces of upper air chambers of the main piston cylinder assemblies are all connected with the detected meter air inlet pipeline, air interfaces of lower air chambers of the main piston cylinder assemblies are all connected with the detected meter air outlet pipeline, an ultrasonic gas meter connecting port is arranged between the detected meter air inlet pipeline and the detected meter air outlet pipeline, cylinder barrels of the compensation piston cylinder assemblies are fixed on the movable plate, piston rods of the compensation piston cylinder assemblies are fixed, and air interfaces of upper air chambers of the compensation piston cylinder assemblies are connected with the detected meter air outlet pipeline; the volume of the upper air chamber of the compensation piston cylinder assembly is the same as the sum of the volumes occupied by the piston rods of all the main piston cylinder assemblies in the cylinder bodies.
When the ultrasonic gas meter works, the gas inlet end and the gas outlet end of the ultrasonic gas meter to be detected are respectively connected with the connection ports of the gas inlet pipeline and the gas outlet pipeline of the ultrasonic gas meter to be detected. In the utility model, when the movable plate drives the piston rods of all the main piston cylinder assemblies to move upwards, the cylinder barrels of the compensation piston cylinder assemblies are simultaneously driven to move upwards at the same speed, so that natural gas flows through the ultrasonic gas meter to be detected from the upper air chambers of all the main piston cylinder assemblies to reach the lower air chambers of all the main piston cylinder assemblies and the upper air chambers of the compensation piston cylinder assemblies, and the volume of the upper air chambers of the compensation piston cylinder assemblies is the same as the sum of the volumes occupied by the piston rods of all the main piston cylinder assemblies in the cylinder bodies, thereby ensuring that the volume of gas flowing through the ultrasonic gas meter to be detected is not changed, and solving the problem that the temperature and the pressure of gas flowing through the ultrasonic gas meter to be detected are easy to change due to the different volumes of the upper air chambers and the lower air chambers of the piston cylinder.
Further, to ensure that the required instantaneous flow can be generated, the number of main piston cylinder assemblies is four.
The beneficial effects of the utility model are as follows: the utility model has simple structure, and the cylinder barrel of the compensation piston cylinder assembly is fixed on the movable plate, so that when the movable plate drives the piston rods of all the main piston cylinder assemblies to move upwards, the cylinder barrel of the compensation piston cylinder assembly is driven to move upwards at the same speed, the volume of the upper air chamber of the compensation piston cylinder assembly is always the same as the sum of the volumes occupied by the piston rods of all the main piston cylinder assemblies in the cylinder body, thereby solving the problem that the temperature and the pressure of gas flowing through an ultrasonic meter to be tested are easy to change due to the different volumes of the upper air chamber and the lower air chamber of the piston cylinder, and effectively improving the verification precision.
Drawings
FIG. 1 is a schematic front view of the present utility model;
FIG. 2 is a schematic top view of FIG. 1;
FIG. 3 is a side view schematic of FIG. 1;
FIG. 4 is a schematic perspective view of the present utility model;
in the figure, 1, a main piston cylinder assembly, 2, an air inlet pipeline of a detected meter, 3, an ultrasonic gas meter to be detected, 4, an air outlet pipeline of the detected meter, 5, a compensation piston cylinder assembly, 6, a movable plate, 7 and a fixed plate.
Detailed Description
The utility model is further illustrated by the following non-limiting examples, in conjunction with the accompanying drawings:
as shown in the drawing, the volume compensation device for the upper and lower air chambers of the piston cylinder comprises a main piston cylinder assembly 1, a compensation piston cylinder assembly 5, an ultrasonic gas meter 3 to be detected, a gas inlet pipeline 2 of the detected meter and a gas outlet pipeline 4 of the detected meter. The number of the main piston cylinder assemblies 1 is two or more, and in this embodiment, the number of the main piston cylinder assemblies 1 is four. The cylinder barrels of the four main piston cylinder assemblies are fixed (can be fixed on a bracket, the bracket is not shown in the embodiment), the piston rods of the four main piston cylinder assemblies 1 are fixed on a movable plate 6 capable of moving up and down, the movable plate 6 can be driven by a driving and transmission assembly to move up and down, the driving and transmission assembly is a screw rod and a servo motor (not shown in the embodiment), the movable plate 6 is connected with the vertically arranged screw rod through a screw nut, and the screw rod is driven by the servo motor to rotate, so that the movable plate 6 is driven to move up and down. The air interfaces of the upper air chambers of the four main piston cylinder assemblies 1 are connected with an air inlet pipeline 2 of the detected meter, the air interfaces of the lower air chambers of the four main piston cylinder assemblies 1 are connected with an air outlet pipeline 4 of the detected meter, an ultrasonic gas meter connecting port is arranged between the air inlet pipeline 2 of the detected meter and the air outlet pipeline 4 of the detected meter, and the air inlet end and the air outlet end of the ultrasonic gas meter are respectively connected with the connecting ports of the air inlet pipeline 2 of the detected meter and the air outlet pipeline 4 of the detected meter. The cylinder of the compensating piston-cylinder assembly 5 is fixed on said movable plate 6, the piston rod of the compensating piston-cylinder assembly 5 is fixed, in this embodiment the piston rod of the compensating piston-cylinder assembly 5 is fixed on a fixed plate 7, and the fixed plate 7 is fixed on a bracket. The gas interface of the upper gas chamber of the compensation piston cylinder assembly 5 is connected with the detected meter gas outlet pipeline 4, and the volume of the upper gas chamber of the compensation piston cylinder assembly 5 is the same as the sum of the volumes occupied by the four piston rods of the four main piston cylinder assemblies 1 in the cylinder bodies.
The utility model works as follows: when the movable plate 6 is driven by the driving and transmission assembly to move upwards, the movable plate 6 drives the piston rods of the four main piston cylinder assemblies 1 to move upwards (the cylinder barrel of the main piston cylinder assembly 1 is not moved), and simultaneously drives the cylinder barrel of the compensation piston cylinder assembly 5 to move upwards (the piston rod of the compensation piston cylinder assembly 5 is not moved) at the same speed, so that natural gas flows from the upper air chambers of the four main piston cylinder assemblies 1 through the ultrasonic gas meter 3 to be tested to reach the lower air chambers of the four main piston cylinder assemblies 1 and the upper air chambers of the compensation piston cylinder assemblies 5, and the volume of the upper air chambers of the compensation piston cylinder assemblies 5 is the same as the sum of the volumes occupied by the four piston rods of the four main piston cylinder assemblies 1 in the cylinder body, thereby ensuring that the volume of gas flowing through the ultrasonic gas meter to be tested is not changed, and solving the problem caused by the difference of the volumes of the upper air chamber and the lower air chamber of the main piston cylinder assemblies.
Other parts in this embodiment are all of the prior art, and are not described herein.
Claims (2)
1. A volume compensation device for upper and lower air chambers of a piston cylinder is characterized in that: the device comprises at least two main piston cylinder assemblies, a compensation piston cylinder assembly, a detected meter air inlet pipeline and a detected meter air outlet pipeline, wherein cylinder barrels of the main piston cylinder assemblies are all fixed, piston rods of the main piston cylinder assemblies are all fixed on a movable plate (6) capable of moving up and down, air interfaces of upper air chambers of the main piston cylinder assemblies are all connected with the detected meter air inlet pipeline, air interfaces of lower air chambers of the main piston cylinder assemblies are all connected with the detected meter air outlet pipeline, an ultrasonic gas meter connecting port is arranged between the detected meter air inlet pipeline and the detected meter air outlet pipeline, cylinder barrels of the compensation piston cylinder assemblies are fixed on the movable plate (6), piston rods of the compensation piston cylinder assemblies are fixed, and air interfaces of the upper air chambers of the compensation piston cylinder assemblies are connected with the detected meter air outlet pipeline; the volume of the upper air chamber of the compensation piston cylinder assembly is the same as the sum of the volumes occupied by the piston rods of all the main piston cylinder assemblies in the cylinder bodies.
2. The piston cylinder up-down air chamber volume compensation device according to claim 1, characterized in that: the number of the main piston cylinder assemblies is four.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322003169.XU CN220339474U (en) | 2023-07-28 | 2023-07-28 | Volume compensation device for upper and lower air chambers of piston cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322003169.XU CN220339474U (en) | 2023-07-28 | 2023-07-28 | Volume compensation device for upper and lower air chambers of piston cylinder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220339474U true CN220339474U (en) | 2024-01-12 |
Family
ID=89456535
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322003169.XU Active CN220339474U (en) | 2023-07-28 | 2023-07-28 | Volume compensation device for upper and lower air chambers of piston cylinder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220339474U (en) |
-
2023
- 2023-07-28 CN CN202322003169.XU patent/CN220339474U/en active Active
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