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CN-121977095-A - Spring load type safety valve automatic pressure regulating equipment and pressure regulating method

CN121977095ACN 121977095 ACN121977095 ACN 121977095ACN-121977095-A

Abstract

The application relates to automatic pressure regulating equipment and a pressure regulating method for a spring load type safety valve, and belongs to the technical field of safety valve detection equipment. The pressure regulating device comprises a power mechanism, a transmission mechanism, a distance detecting mechanism, a pressure detecting mechanism and a control mechanism, wherein a first end of the transmission mechanism is in transmission connection with an output end of the power mechanism, a second end of the transmission mechanism is connected with an adjusting knob of a spring load type safety valve, the adjusting knob is rotated and used for adjusting spring prestress of the spring load type safety valve so as to adjust pressure relief pressure, the distance detecting mechanism is fixedly arranged above the adjusting knob and used for detecting the height change of the adjusting knob, the pressure detecting mechanism is arranged at an inlet of the spring load type safety valve and used for detecting the pressure at the inlet, the power mechanism, the distance detecting mechanism and the pressure detecting mechanism are all electrically connected with the control mechanism, and the pressure regulating method is realized based on the pressure regulating device. The application has the effect of improving the pressure regulating precision and the pressure regulating efficiency.

Inventors

  • JIANG NAN
  • JIA SHIJUAN

Assignees

  • 莱斯安全阀门(天津)有限公司

Dates

Publication Date
20260505
Application Date
20260128

Claims (10)

  1. 1. The utility model provides a spring load formula relief valve automatic pressure regulating equipment which characterized in that, spring load formula relief valve (5) are installed in test platform, spring load formula relief valve automatic pressure regulating equipment includes: A power mechanism (1); the first end of the transmission mechanism (2) is in transmission connection with the output end of the power mechanism (1), the second end of the transmission mechanism (2) is connected with an adjusting knob of the spring load type safety valve (5), and the adjusting knob is rotated to adjust the spring prestress of the spring load type safety valve (5) so as to adjust the pressure relief pressure; The distance detection mechanism (3) is fixedly arranged above the adjusting knob, and the distance detection mechanism (3) is used for detecting the height change of the adjusting knob; The pressure detection mechanism (4) is arranged at the inlet of the spring load type safety valve (5) and is used for detecting the pressure at the inlet; The power mechanism (1), the distance detection mechanism (3) and the pressure detection mechanism (4) are all electrically connected with the control mechanism (6).
  2. 2. The automatic pressure regulating device of the spring-loaded safety valve according to claim 1, wherein the power mechanism (1) comprises a supporting frame (11) and a servo motor (12), the supporting frame (11) is arranged on one side of the test platform, the servo motor (12) is connected with the supporting frame (11), and the servo motor (12) is arranged right above the regulating knob in an erected mode.
  3. 3. The spring-loaded safety valve automatic pressure regulating device according to claim 1, characterized in that the transmission mechanism (2) is a coupling.
  4. 4. The automatic pressure regulating device of a spring-loaded safety valve according to claim 1, characterized in that the distance detecting means (3) is a distance sensor and the pressure detecting means (4) is a pressure sensor.
  5. 5. An automatic pressure regulating method of a spring-loaded safety valve, applied to the automatic pressure regulating device of the spring-loaded safety valve as claimed in any one of claims 1 to 4, comprising: the preparation stage, the spring load type safety valve (5) is installed on the test platform, the adjusting parameters of the spring load type safety valve (5) are input into the control mechanism (6), and a preset pressure value and a pressure value error range are set; An initial calculation stage, wherein the control mechanism (6) calculates the rotation number of the adjusting knob according to the adjusting parameter; In the action stage, the power mechanism (1) drives the adjusting knob to rotate according to the rotation turns; a detection stage, wherein the distance detection mechanism (3) detects the height change of the adjusting knob and feeds back the height information to the control mechanism (6); a testing stage, namely pressurizing an inlet of the spring-loaded safety valve (5), wherein the pressure detection mechanism (4) detects the pressure change of the inlet, and captures a pressure dip point to determine the opening of the valve; And in the verification stage, the control mechanism (6) compares the valve opening real-time pressure value detected by the pressure detection mechanism (4) with the preset pressure value to obtain a real-time error value, and judges whether the real-time error value is within the error range of the pressure value or not so as to judge whether the spring load type safety valve (5) normally completes pressure regulation or not.
  6. 6. The automatic pressure regulating method of a spring-loaded safety valve of claim 5, wherein in the verification phase: If the real-time error value is within the error range of the pressure value, the normal pressure regulation of the spring load type safety valve (5) is finished; If the real-time error value is not in the pressure value error range, the pressure regulating value of the spring load type safety valve (5) is abnormal, and a feedback stage is entered, wherein the feedback stage comprises: The control mechanism (6) pushes back the true elastic coefficient of the spring and returns to the action stage to carry out secondary correction.
  7. 7. The automatic pressure regulating method of a spring-loaded safety valve according to claim 6, wherein the regulating parameters include the weight of the valve stem and the spring disc of the spring-loaded safety valve (5), the spring rate of the spring, the nozzle bore of the spring-loaded safety valve (5) and the thread pitch of the regulating knob.
  8. 8. The automatic pressure regulating method of a spring-loaded safety valve according to claim 7, characterized in that in the initial calculation phase, according to the force balance principle of opening the spring-loaded safety valve (5), the sum of the inlet pressure force and the weight of the valve stem and the spring disc equals the spring prestress, namely: ; In the above-mentioned method, the step of, The valve is a preset pressure value of a valve, wherein A is the effective area of a nozzle, G is the weight of a valve rod and a spring disc, k is the spring elastic coefficient, and x is the initial spring compression; The calculation formula of the effective area of the nozzle is as follows: ; In the above formula, d is the caliber of the nozzle; the number of turns of the adjusting knob is determined by the ratio of the initial spring compression to the thread pitch, namely: ; in the above formula, n is the number of turns, and p is the thread pitch.
  9. 9. The automatic pressure regulating method of spring-loaded safety valve according to claim 8, wherein said true spring rate is countered according to force balance principle The calculation formula of (2) is as follows: ; In the above-mentioned method, the step of, The valve is a real-time pressure value for valve opening, A is the effective area of a nozzle, G is the weight of a valve rod and a spring disc, and x is the compression amount of a spring.
  10. 10. The automatic pressure regulating method of spring-loaded safety valve according to claim 9, wherein in the secondary correction process, the total spring compression required to reach the valve preset pressure value is calculated based on the actual spring constant The calculation formula of (2) is as follows: ; Spring compression amount to be supplemented The difference between the total spring compression and the initial spring compression is: ; The number of turns of the adjusting knob to be supplemented The method comprises the following steps: 。

Description

Spring load type safety valve automatic pressure regulating equipment and pressure regulating method Technical Field The application relates to the technical field of safety valve detection equipment, in particular to spring load type automatic pressure regulating equipment and a pressure regulating method for a safety valve. Background The spring load type safety valve is an essential overpressure protection device in a boiler, a pressure container and a pipeline system, and can automatically open and release pressure when the system pressure exceeds a preset value, so that the safe operation of the system is ensured. In industrial production, the equipment has extremely wide application range, and the safety valve can not be used for stably controlling the system pressure in the process industries such as chemical industry, electric power, pharmacy and the like, and the civil industries such as food, beverage and the like. The reliable operation of the safety valve directly relates to the safety and stability of the whole production system, and once an overpressure accident occurs, serious safety consequences can be caused, so that casualties and property loss are caused. Therefore, ensuring that the setting pressure of the safety valve is accurately adjusted to a specified value is of great importance to ensuring the normal operation of the equipment and reducing the risk of accidents. Currently, the main flow pressure regulating mode is manual pressure regulation before the safety valve leaves the factory or when regular verification is carried out. The operator needs to manually rotate the adjusting knob at the top of the safety valve by using tools such as a wrench, so as to change the compression amount of the spring, namely, adjust the prestress of the spring. After that, pressure is applied to the valve inlet through an external pressurizing device, and the opening condition of the valve is closely observed. If the opening pressure does not match the target value, the operator is required to repeatedly and finely adjust the adjustment knob and repeatedly perform the pressurization test. However, this way of manual pressure regulation has significant drawbacks. The pressure regulating device is highly dependent on experience and hand feeling of operators, and different operators can be difficult to ensure pressure regulating precision and lower in efficiency due to the difference of personal technical level and operation habit. In addition, manual voltage regulation is essentially a trial and error process, lacks a definite quantization target, and can achieve a more ideal effect through repeated adjustment, which is time-consuming and labor-consuming and can increase labor cost. When facing a large number of verification tasks, the limitation of manual operation is more obvious, the efficiency is low and the cost is high. Disclosure of Invention In order to improve pressure regulating precision and pressure regulating efficiency, the application provides automatic pressure regulating equipment and a pressure regulating method for a spring load type safety valve. The application provides automatic pressure regulating equipment of a spring load type safety valve, which adopts the following technical scheme: The automatic pressure regulating device for the spring load type safety valve comprises a power mechanism, a transmission mechanism, a control mechanism and a distance detection mechanism, wherein the first end of the transmission mechanism is in transmission connection with the output end of the power mechanism, the second end of the transmission mechanism is connected with an adjusting knob of the spring load type safety valve, the adjusting knob is rotated and used for adjusting the spring prestress of the spring load type safety valve so as to adjust the pressure relief pressure, the distance detection mechanism is fixedly arranged above the adjusting knob and used for detecting the height change of the adjusting knob, the pressure detection mechanism is arranged at an inlet of the spring load type safety valve and used for detecting the pressure at the inlet, and the power mechanism, the distance detection mechanism and the pressure detection mechanism are all electrically connected with the control mechanism. By adopting the technical scheme, the power mechanism provides power for the rotation of the adjusting knob, the transmission mechanism transmits the power of the power mechanism to the adjusting knob, the prestress of the spring load type safety valve is adjusted by rotating the adjusting knob, the pressure relief pressure is adjusted, the distance detection mechanism detects the height change of the adjusting knob and provides information of the position change of the adjusting knob for the control mechanism, the pressure detection mechanism detects the pressure at the inlet of the spring load type safety valve and captures the pressure dip point to determine the opening of the valve