Differential pressure control system
By designing a differential pressure control system and utilizing a single pressure controller and differential pressure control loop, the problem of inconsistent calibration of the differential pressure transmitter is solved, an efficient and accurate calibration process is achieved, and the operation is simplified.
Patent Information
- Application Number
- CN202422993942.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-05
- Publication Date
- 2025-09-16
- Estimated Expiration
- 2034-12-05
AI Technical Summary
In the prior art, calibration of a differential pressure transmitter requires two independent pressure controllers, which results in inconsistent calibration output airflow pressures, affects accuracy, and is inconvenient to operate.
A differential pressure control system was designed. Through a pressure controller and a differential pressure control loop, including multiple branch pipes, switch valves, balancing valves and standard sensors, efficient calibration of the differential pressure transmitter was achieved. Standard sensors and switch valves were used to control the airflow to ensure calibration accuracy and flexibility.
It realizes efficient calibration of differential pressure transmitters with a single pressure controller, improves calibration accuracy, reduces the number of equipment, and simplifies the operation process.
Smart Images
Figure CN223347237U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of pressure controllers, in particular to a pressure difference control system. Background Art
[0002] A differential pressure transmitter, also known as a differential pressure transmitter, is a device used to measure the pressure difference between two points in a fluid. It converts the pressure difference into an electrical signal and transmits it to a control system or display device to monitor and control parameters such as flow and liquid level. A differential pressure transmitter typically consists of two pressure ports and a measuring chamber. When the medium enters the measuring chamber, it affects the pressure within the chamber, causing the pressure within the chamber to change. The differential pressure transmitter measures the pressure difference within the chamber to calculate the differential pressure between the two pressure points and converts it into a standard output signal.
[0003] During use, a differential pressure transmitter requires calibration of its two pressure interfaces. This calibration primarily involves a pressure controller, which serves as the source of the calibration pressure. Generally, the calibration pressure must reach and stabilize at the calibration pressure point (i.e., a specific pressure value). Current testing of the two measuring chambers of a differential pressure transmitter requires two pressure controllers to input the airflow pressure for calibration, requiring two pressure controllers for each test. The two independent machines may experience inconsistent calibration output airflow pressures, potentially affecting the accuracy of the differential pressure transmitter calibration. Furthermore, requiring two calibration machines can be inconvenient. Utility Model Content
[0004] The utility model provides a pressure difference control system, aiming to at least solve one of the technical problems existing in the prior art.
[0005] The technical solution of the present utility model is a pressure differential control system, which includes: a pressure controller for outputting a test pressure fluid, the pressure controller including a fluid pressure output end and a fluid pressure input end, a differential pressure control circuit, the differential pressure control circuit including a first branch pipe, a second branch pipe and a third branch pipe, the first branch pipe being respectively connected in series with a fluid pressure output end, a fluid pressure input end, a first measured differential pressure transformer end, a second measured differential pressure transformer end and a standard static pressure sensor, the second branch pipe and the third branch pipe being respectively connected in parallel with the first branch pipe, the second branch pipe being connected in series with a standard differential pressure sensor, and the third branch pipe being connected in series with a balancing valve.
[0006] Furthermore, the standard static pressure sensor is connected in series to the first branch pipe between the second measured differential pressure transformer end and the second branch pipe.
[0007] Furthermore, a second switch valve and a fourth switch valve are connected in series on the first branch pipe between the second branch pipe and the third branch pipe, and a fourth branch pipe is also connected in parallel on the first branch pipe between the second switch valve and the fourth switch valve, and an exhaust valve is connected in series on the fourth branch pipe.
[0008] Furthermore, it also includes: an anti-leakage air supply cylinder is connected in parallel to the first branch pipeline between the second branch pipeline and the third branch pipeline.
[0009] Furthermore, the first measured differential transformer end is a high-voltage end of the measured differential transformer, and the second measured differential transformer end is a low-voltage end of the measured differential transformer.
[0010] Furthermore, it also includes: a control circuit and a display and input module, wherein the control circuit is electrically connected to the balancing valve, the second switch valve, the fourth switch valve, the exhaust valve, the standard static pressure sensor, the standard differential pressure sensor and the electrical control port of the display and input module.
[0011] Furthermore, the control circuit is also communicatively connected to the communication module.
[0012] Furthermore, the second branch pipeline is connected in series with the standard differential pressure sensor having a detachably connected power supply port.
[0013] The beneficial effects of the utility model include:
[0014] During the calibration of the differential pressure transmitter, when the differential pressure output end and the fluid pressure input end of the pressure controller output the differential pressure to the two pressure interfaces of the differential pressure transmitter to be measured through the first branch pipeline, the balancing valve in the third branch pipeline is controlled to be closed, and the standard differential pressure sensor in the second branch pipeline obtains the differential pressure reading of the differential pressure transmitter, and compares whether the differential pressure output by the pressure controller is consistent, thereby determining whether the differential pressure transmitter is accurately calibrated; during the calibration of the differential pressure transmitter, when the fluid pressure of the pressure controller meets the "high static pressure condition" and is then transmitted to both ends of the differential pressure transmitter through the first branch pipeline, the balancing valve in the third branch pipeline is controlled to be open, and the standard static pressure sensor connected in series with the first branch pipeline can collect real-time static pressure readings, so that the differential pressure control system can realize the function of measuring differential pressure under high static pressure conditions; the differential pressure control system realizes that a pressure controller calibrates the differential pressure transmitter through a differential pressure control loop, saving a pressure controller that outputs a standard air flow and making calibration more convenient for users.
[0015] In addition, additional aspects and advantages of the present invention will be given in part in the following description, and in part will become obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a schematic diagram of the principle of a pressure difference control system according to an embodiment of the present utility model.
[0017] Figure 2 It is a control block diagram of a pressure difference control system according to an embodiment of the present utility model.
[0018] Figure 3 Schematic diagram of a pressure difference control system according to an embodiment of the present invention. DETAILED DESCRIPTION
[0019] The following will be combined with the embodiments and drawings to clearly and completely describe the concept, specific structure and technical effects of the present invention so as to fully understand the purpose, scheme and effect of the present invention. It should be noted that the embodiments and features in the embodiments of this application can be combined with each other unless there is a conflict.
[0020] It should be noted that, unless otherwise specified, when a feature is referred to as being "fixed" or "connected" to another feature, it may be directly fixed or connected to the other feature or indirectly fixed or connected to the other feature. In addition, the terms "upper," "lower," "left," "right," "top," and "bottom" used in this utility model are merely relative to the relative positions of the components of the utility model in the accompanying drawings.
[0021] In addition, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art. The terms used in this specification are only for describing specific embodiments and are not intended to limit the present invention. The term "and / or" as used herein includes any combination of one or more of the related listed items.
[0022] It should be understood that although the terms first, second, third, etc. may be used to describe various elements in the present disclosure, these elements should not be limited to these terms. These terms are only used to distinguish elements of the same type from each other. For example, a first element may also be referred to as a second element, and similarly, a second element may also be referred to as a first element without departing from the scope of the present disclosure.
[0023] Reference Figures 1 to 3 In some embodiments, the present invention discloses a pressure differential control system, which includes:
[0024] Reference Figure 1 As shown, a pressure controller 10 for outputting test pressure fluid includes a fluid pressure output terminal 11 and a fluid pressure input terminal 12. The pressure controller 10 here serves as the source of calibration fluid pressure during the calibration process.
[0025] Continue to refer to Figure 1The differential pressure control loop 200 shown includes a first branch pipe 210 , a second branch pipe 220 and a third branch pipe 230 .
[0026] Figure 1 The large loop in the diagram is the first branch pipe 210, which is connected in series with the fluid pressure output terminal 11, the fluid pressure input terminal 12, the first differential pressure transformer terminal 211, the second differential pressure transformer terminal 212, and the standard static pressure sensor 213. The two measuring chambers of the differential pressure transmitter to be measured and calibrated are connected to the first differential pressure transformer terminal 211 and the second differential pressure transformer terminal 212, respectively.
[0027] Continue to refer to Figure 1 As shown, the second branch pipeline 220 and the third branch pipeline 230 are respectively connected in parallel with the first branch pipeline 210 , the second branch pipeline 220 is connected in series with a standard differential pressure sensor 221 , and the third branch pipeline 230 is connected in series with a balancing valve S1 .
[0028] During the calibration of the differential pressure transmitter, when the differential pressure output end and the fluid pressure input end of the pressure controller output the differential pressure through the first branch pipeline to the two pressure interfaces of the differential pressure transmitter to be measured, the balancing valve in the third branch pipeline is controlled to be closed, and the standard differential pressure sensor in the second branch pipeline obtains the differential pressure reading of the differential pressure transmitter. The differential pressure output by the pressure controller is compared to see whether it is consistent, so as to know whether the differential pressure transmitter is calibrated accurately.
[0029] "High static pressure conditions" for differential pressure transmitters generally refer to operating the transmitter in high static pressure environments. Specifically, this involves using the transmitter in operating pressures above 16 MPa. Under these high static pressure conditions, the transmitter must have sufficient pressure resistance to ensure proper operation and measurement accuracy.
[0030] During the calibration of the differential pressure transmitter, when the fluid pressure of the pressure controller that meets the "high static pressure condition" is transmitted to both ends of the differential pressure transmitter through the first branch pipeline, the balancing valve in the third branch pipeline is controlled to be open, and the standard static pressure sensor connected in series with the first branch pipeline can collect real-time static pressure readings, so that the differential pressure control system can realize the function of measuring differential pressure under high static pressure conditions.
[0031] The differential pressure control system enables a pressure controller to calibrate the differential pressure transmitter through a differential pressure control loop, thus saving a pressure controller for outputting a standard air flow and making calibration more convenient for users.
[0032] Specifically, refer to Figure 1As shown, the standard static pressure sensor 213 is connected in series to the first branch pipe 210 between the second measured differential pressure transformer terminal 212 and the second branch pipe 220 .
[0033] In the embodiment shown in the figure, a second switch valve S2 and a fourth switch valve S4 are connected in series to the first branch pipe 210 between the second branch pipe 220 and the third branch pipe 230. A fourth branch pipe 240 is also connected in parallel to the first branch pipe 210 between the second switch valve S2 and the fourth switch valve S4. An exhaust valve S3 is connected in series to the fourth branch pipe 240. In this pressure differential control system, multiple switch valves are added to the first branch pipe in combination with exhaust valves in parallel, so that the air pressure in the pipeline can be controlled as needed during each calibration operation, thereby increasing the flexibility of the calibration operation. A leak-proof air supply cylinder 214 is connected in parallel to the first branch pipe 210 between the second branch pipe 220 and the third branch pipe 230. The addition of the air supply cylinder 214 enables the entire pressure differential measurement branch to achieve the function of fluid leakage compensation.
[0034] In some embodiments, the first measured differential transformer terminal 211 is a high-voltage terminal of the measured differential transformer, and the second measured differential transformer terminal 212 is a low-voltage terminal of the measured differential transformer.
[0035] Figure 1 Combine Figure 2 As shown, the system also includes a control circuit 30 and a display and input module 40. The control circuit 30 is electrically connected to the balancing valve S1, the second on-off valve S2, the fourth on-off valve S4, the exhaust valve S3, the standard static pressure sensor 213, the standard differential pressure sensor 221, and the electronic control port of the display and input module 40. The control circuit 30 is also communicatively connected to the communication module 50. The operator can reliably operate and control each electronic control module in the pressure differential control system through the remote control, the display and input module, etc., achieving one-button automatic measurement, which can be operated locally or remotely.
[0036] In order to achieve self-calibration of the standard differential pressure sensor, the second branch pipe 220 is connected in series with the standard differential pressure sensor 221 having a detachably connected power supply port.
[0037] Figure 3 From the overall schematic diagram, it can be seen that the pressure differential control system is equivalent to two parallel-connected pressure controllers A and B. The pressure controller A is equivalent to the pressure controller 10 connected in parallel with a differential pressure control loop 200 in the measurement operation, and the differential pressure control loop 200 is equivalent to the B pressure controller.
[0038] The above description is merely a preferred embodiment of the present invention. The present invention is not limited to the aforementioned embodiments. As long as the technical effects of the present invention are achieved by the same means, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present disclosure shall be included within the scope of protection of the present disclosure. Within the scope of protection of the present invention, its technical solutions and / or implementation methods may be modified and varied in various ways.
Claims
1. A pressure difference control system, characterized in that: include: A pressure controller (10) for outputting a test pressure fluid, the pressure controller (10) comprising a fluid pressure output end (11) and a fluid pressure input end (12), A differential pressure control circuit (200) comprises a first branch pipe (210), a second branch pipe (220) and a third branch pipe (230); the first branch pipe (210) is respectively connected in series with a fluid pressure output end (11), a fluid pressure input end (12), a first measured differential pressure transformer end (211), a second measured differential pressure transformer end (212) and a standard static pressure sensor (213); the second branch pipe (220) and the third branch pipe (230) are respectively connected in parallel with the first branch pipe (210); the second branch pipe (220) is connected in series with a standard differential pressure sensor (221); and the third branch pipe (230) is connected in series with a balancing valve (S1).
2. The pressure difference control system according to claim 1, characterized in that: The standard static pressure sensor (213) is connected in series to the first branch pipe (210) between the second measured differential pressure transformer end (212) and the second branch pipe (220).
3. The pressure difference control system according to claim 1, characterized in that: A second switch valve (S2) and a fourth switch valve (S4) are connected in series to the first branch pipe (210) between the second branch pipe (220) and the third branch pipe (230); a fourth branch pipe (240) is also connected in parallel to the first branch pipe (210) between the second switch valve (S2) and the fourth switch valve (S4); and an exhaust valve (S3) is connected in series to the fourth branch pipe (240).
4. The pressure difference control system according to claim 1, characterized in that: Also includes: An anti-leakage air supply cylinder (214) is connected in parallel to the first branch pipeline (210) between the second branch pipeline (220) and the third branch pipeline (230).
5. The pressure difference control system according to claim 1, characterized in that: The first measured differential transformer end (211) is a high-voltage end of the measured differential transformer, and the second measured differential transformer end (212) is a low-voltage end of the measured differential transformer.
6. The pressure difference control system according to claim 3, characterized in that: Also includes: A control circuit (30) and a display and input module (40), wherein the control circuit (30) is electrically connected to the balancing valve (S1), the second switch valve (S2), the fourth switch valve (S4), the exhaust valve (S3), the standard static pressure sensor (213), the standard differential pressure sensor (221), and the electrical control port of the display and input module (40).
7. The pressure difference control system according to claim 6, characterized in that: The control circuit (30) is also communicatively connected to the communication module (50).
8. The pressure difference control system according to claim 1, characterized in that: The second branch pipe (220) is connected in series with the standard differential pressure sensor (221) having a detachably connected power supply port.