Portable pressure switch calibration instrument convenient for medium recovery

Abstract

The utility model relates to a portable pressure switch calibration instrument convenient for medium recovery. After medium oil in an oil tank of an inspection instrument is reduced, the medium oil needs to be frequently added into the oil tank, and then waste of labor force and resources is finally caused. The device comprises a base structure, an oil tank structure, a touch screen and a digital pressure gauge, the oil tank structure is installed on the base structure and comprises a fixed oil tank, an external threaded pipe, a telescopic oil tank and a telescopic spring, the external threaded pipe is fixedly installed at the lower end of the fixed oil tank, and the telescopic spring is installed on the outer threaded pipe. The telescopic oil tank is fixedly installed at the upper end of the fixed oil tank, the telescopic spring is fixedly installed in the fixed oil tank and the telescopic oil tank, and an opening structure is fixedly installed on the outer wall of the fixed oil tank. The device is used for observing the blockage condition of the pressure tapping pipeline.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure switch calibration, in particular to a portable pressure switch calibration instrument which is convenient for recovering a medium. Background Art

[0002] Pressure switches utilize high-precision, high-stability pressure sensors and transmitter circuits, coupled with dedicated CPU modular signal processing technology, to detect, display, generate alarms, and output control signals for medium pressure signals. When the measured pressure reaches or exceeds a preset rated value, the free end of the elastic element in the pressure switch displaces, pushing the switch element directly or through a comparison, thereby changing the switch's on / off state and controlling the measured pressure. Pressure switch calibration is a crucial step in ensuring the accuracy and reliability of pressure switches, ensuring that the setpoint operating difference meets tolerance requirements, thereby guaranteeing their stability and accuracy in practical applications. Currently, some pressure switches are installed at low locations. When a portable pressure switch calibration instrument is used for emergency calibration, the medium oil at the connection between the pressure switch and the calibration instrument can easily spill onto the work site when the pressure switch is removed. This not only requires cleaning, increasing the cleaning burden, but also requires frequent refilling of the oil tank in the instrument as the oil is depleted, ultimately wasting labor and resources. Therefore, a portable pressure switch calibration instrument that facilitates medium recovery is needed to address these issues. Utility Model Content

[0003] The main purpose of the utility model is to provide a portable pressure switch calibration instrument that is convenient for recovering medium, which can effectively solve the problems in the background technology.

[0004] The above purpose is achieved through the following technical solutions:

[0005] A portable pressure switch calibration instrument for facilitating medium recovery, comprising: a base structure, an oil tank structure, a touch screen, and a digital pressure gauge, wherein the oil tank structure is mounted on the base structure, the oil tank structure comprises a fixed oil tank, an externally threaded pipe, a telescopic oil tank, and a telescopic spring, the externally threaded pipe being fixedly mounted on the lower end of the fixed oil tank, the telescopic oil tank being fixedly mounted on the upper end of the fixed oil tank, the telescopic spring being fixedly mounted in the fixed oil tank and the telescopic oil tank, an opening structure being fixedly mounted on the outer wall of the fixed oil tank, the opening structure being composed of a fixed plate, a base rod, a limiting ring, an anti-slip plate, and a baffle, the base rod being fixedly mounted on the upper end of the fixed plate, the limiting ring being fixedly sleeved on the base rod, the anti-slip plate being fixedly mounted on the upper end of the base rod, the baffle being rotatably mounted on the base rod, and the baffle being simultaneously located between the limiting ring and the anti-slip plate.

[0006] The portable pressure switch calibration instrument that is convenient for recovering medium, the touch screen and the digital pressure gauge are both installed on the upper end of the base structure, and the pressure switch is also installed on the base structure.

[0007] The portable pressure switch calibration instrument that is convenient for recovering medium, the external threaded pipe on the oil tank structure is installed on the base structure, the fixed oil tank is located above the base structure, and a through groove is opened on the upper side wall of the fixed oil tank.

[0008] The portable pressure switch calibration instrument that is convenient for recovering medium has an injection hole on the upper side wall of the telescopic oil tank on the oil tank structure, a sealing plug is installed in the injection hole, the telescopic spring passes through the through groove, and the telescopic spring is fixedly connected to the lower side wall of the fixed oil tank and the upper side wall of the telescopic oil tank.

[0009] The portable pressure switch calibration instrument that is convenient for recovering medium, the fixed plate on the opening structure is fixedly installed on the outer wall of the fixed oil tank.

[0010] The portable pressure switch calibration instrument convenient for recovering medium has a mounting hole and a set hole on the baffle on the opening structure, and the baffle is rotatably mounted on the base rod through the mounting hole. Beneficial effects

[0011] 1. The utility model provides an oil tank structure consisting of a fixed oil tank, an externally threaded pipe, a telescopic oil tank, and a telescopic spring, and an opening structure. After the pressure switch is inspected, before the pressure switch is removed, the baffle on the opening structure is rotated to release the obstruction of the telescopic oil tank, so that the telescopic oil tank is elastically expanded upward under the elastic force of the telescopic spring, thereby increasing the volume of the oil tank structure to generate a slight negative pressure, and finally withdrawing all the medium oil from the pressure switch being calibrated. This avoids the situation where the pressure switch is installed at a low position and, in an emergency, the medium oil at the connection between the pressure switch and the calibration instrument is spilled on the work site when the pressure switch is removed after the pressure switch is calibrated using a portable pressure switch calibration instrument. On the one hand, there is no need to clean the work site, thereby reducing the cleaning burden. On the other hand, the medium oil in the oil tank structure is not easily reduced, so there is no need to frequently add medium oil to the oil tank structure, ultimately avoiding waste of labor and resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0013] Figure 2 This is a schematic diagram of the cross-section structure of the fixed oil tank, externally threaded pipe, telescopic oil tank, and sealing plug of the present invention;

[0014] Figure 3 This is a disassembled view of the fixed oil tank, externally threaded pipe, and telescopic oil tank of the present invention after being cut apart;

[0015] Figure 4 This is a schematic diagram of the structure of the baffle and base rod after being separated;

[0016] In the figure: 1. Base structure; 2. Oil tank structure; 3. Opening structure; 4. Digital pressure gauge; 5. Pressure switch; 6. Touch screen; 7. Fixed oil tank; 8. Externally threaded pipe; 9. Telescopic oil tank; 10. Telescopic spring; 11. Sealing plug; 12. Through groove; 13. Liquid injection hole; 14. Base rod; 15. Limiting ring; 16. Anti-slip plate; 17. Baffle; 18. Mounting hole; 19. Set hole; 20. Fixed plate. DETAILED DESCRIPTION

[0017] See also Figure 1 、 Figure 2 、 Figure 3 、 Figure 4As shown, a portable pressure switch calibration instrument for facilitating the recovery of media comprises a base structure 1, an oil tank structure 2, a touch screen 6, and a digital pressure gauge 4. The oil tank structure 2 is mounted on the base structure 1. The oil tank structure 2 comprises a fixed oil tank 7, an externally threaded pipe 8, a telescopic oil tank 9, and a telescopic spring 10. The externally threaded pipe 8 is fixedly mounted on the lower end of the fixed oil tank 7, the telescopic oil tank 9 is fixedly mounted on the upper end of the fixed oil tank 7, the telescopic spring 10 is fixedly mounted in the fixed oil tank 7 and the telescopic oil tank 9, and an opening structure 3 is fixedly mounted on the outer wall of the fixed oil tank 7. The opening structure 3 is fixedly mounted on the outer wall of the fixed oil tank 7. The structure 3 is composed of a fixed plate 20, a base rod 14, a limiting ring 15, an anti-slip plate 16 and a baffle 17. The base rod 14 is fixedly mounted on the upper end of the fixed plate 20, the limiting ring 15 is fixedly sleeved on the base rod 14, the anti-slip plate 16 is fixedly mounted on the upper end of the base rod 14, and the baffle 17 is rotatably mounted on the base rod 14, and the baffle 17 is also located between the limiting ring 15 and the anti-slip plate 16. The touch screen 6 and the digital pressure gauge 4 are both mounted on the upper end of the base structure 1. The base structure 1 is also equipped with a pressure switch 5. When in use, the pressure switch 5 can be mounted on the base structure 1. During the calibration, the liquid pressure source is adjusted to apply pressure to the system. Then, the standard pressure value is obtained using the digital pressure gauge 4 and compared with the reading of the pressure switch 5 to be calibrated. Finally, the data is recorded and analyzed to evaluate the accuracy of the calibrated pressure switch 5 and ensure the reliability of the measurement results. After the pressure switch 5 is inspected and before the pressure switch 5 is removed, the baffle 17 on the opening structure 3 is rotated to release the obstruction of the telescopic oil tank 9, so that the telescopic oil tank 9 is elastically expanded upward under the elastic force of the telescopic spring 10, thereby increasing the volume of the oil tank structure 2 and generating a slight negative pressure, and finally completely withdrawing the medium oil from the calibrated pressure switch 5. This avoids the situation where the pressure switch 5 is installed at a low position and the medium oil at the connection between the pressure switch 5 and the calibration instrument is spilled on the work site when the pressure switch 5 is removed after the pressure switch 5 is calibrated using an emergency instrument. On the one hand, there is no need to clean the work site, thereby reducing the cleaning burden. On the other hand, the medium oil in the oil tank structure 2 is not easily reduced, so there is no need to frequently add medium oil to the oil tank structure 2, ultimately avoiding waste of labor and resources.

[0018] Furthermore, the external threaded pipe 8 on the oil tank structure 2 is installed on the base structure 1, the fixed oil tank 7 is located above the base structure 1, a through groove 12 is provided on the upper side wall of the fixed oil tank 7, and a liquid injection hole 13 is provided on the upper side wall of the telescopic oil tank 9 on the oil tank structure 2. A sealing plug 11 is installed in the liquid injection hole 13, and the telescopic spring 10 passes through the through groove 12. The telescopic spring 10 is fixedly connected to the lower side wall of the fixed oil tank 7 and the upper side wall of the telescopic oil tank 9. The fixed plate 20 on the opening structure 3 is fixedly installed on the outer wall of the fixed oil tank 7, and the baffle 17 on the opening structure 3 is provided with a mounting hole 18 and a set hole 19. The baffle 17 is rotatably mounted on the base rod 14 through the mounting hole 18. Before removing the pressure switch 5, the volume of the oil tank structure 2 can be increased, thereby generating a slight negative pressure to transfer the medium oil from the pressure switch 5 to be calibrated. The telescopic oil tank 9 and the sealing plug 11 are all withdrawn in the process of being withdrawn. The method is as follows: first, the telescopic oil tank 9 and the sealing plug 11 are pressed downwards, so that the height of the sealing plug 11 is lower than the baffle 17, and then the baffle 17 is rotated with the base rod 14 as the axis, so that the baffle 17 is removed from the top of the telescopic oil tank 9. At this time, under the elastic force of the telescopic spring 10, the telescopic oil tank 9 can be expanded upwards, and the volume of the oil tank structure 2 is increased. After the pressure switch 5 is removed, the telescopic oil tank 9 and the sealing plug 11 can be pressed downwards, so that the height of the sealing plug 11 is lower than the baffle 17, and then the baffle 17 is rotated with the base rod 14 as the axis. When the baffle 17 is located just above the telescopic oil tank 9, the telescopic oil tank 9 that is pressed downwards is released. At this time, under the elastic force of the telescopic spring 10, the telescopic oil tank 9 can be pressed against the lower end of the baffle 17, and the sealing plug 11 can be in the sleeve hole 19.

Claims

1. A portable pressure switch calibration instrument that is convenient for recovering medium, comprising: The base structure, the oil tank structure, the touch screen and the digital pressure gauge are composed. The oil tank structure is installed on the base structure, and is characterized in that: the oil tank structure includes a fixed oil tank, an externally threaded pipe, a telescopic oil tank and a telescopic spring, the externally threaded pipe is fixedly installed at the lower end of the fixed oil tank, the telescopic oil tank is fixedly installed at the upper end of the fixed oil tank, the telescopic spring is fixedly installed in the fixed oil tank and the telescopic oil tank, an opening structure is fixedly installed on the outer wall of the fixed oil tank, the opening structure is composed of a fixed plate, a base rod, a limiting ring, an anti-slip plate and a baffle, the base rod is fixedly installed at the upper end of the fixed plate, the limiting ring is fixedly sleeved on the base rod, the anti-slip plate is fixedly installed on the upper end of the base rod, the baffle is rotatably installed on the base rod, and the baffle is simultaneously located between the limiting ring and the anti-slip plate.

2. A portable pressure switch calibration instrument that is convenient for recovering medium according to claim 1, characterized in that: The touch screen and digital pressure gauge are both installed on the upper end of the base structure, and a pressure switch is also installed on the base structure.

3. The portable pressure switch calibration instrument for facilitating medium recovery according to claim 2, characterized in that: The external threaded pipe on the oil tank structure is installed on the base structure. The fixed oil tank is located above the base structure. A through groove is provided on the upper side wall of the fixed oil tank.

4. The portable pressure switch calibration instrument for facilitating medium recovery according to claim 3, characterized in that: A liquid injection hole is provided on the upper side wall of the telescopic oil tank on the oil tank structure, a sealing plug is installed in the liquid injection hole, the telescopic spring passes through the through groove, and the telescopic spring is fixedly connected to the lower side wall of the fixed oil tank and the upper side wall of the telescopic oil tank.

5. The portable pressure switch calibration instrument for facilitating medium recovery according to claim 4, characterized in that: The fixed plate on the opening structure is fixedly installed on the outer wall of the fixed oil tank.

6. The portable pressure switch calibration instrument for facilitating medium recovery according to claim 5, characterized in that: A mounting hole and a fitting hole are provided on the baffle on the opening structure, and the baffle is rotatably mounted on the base rod through the mounting hole.

Images