CN217821356U - Automatic reducing orifice plate adjusting system suitable for different pressure environments - Google Patents
Automatic reducing orifice plate adjusting system suitable for different pressure environments Download PDFInfo
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- 238000004519 manufacturing process Methods 0.000 description 4
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Abstract
An automatic reducing orifice plate adjusting system adapting to different pressure environments belongs to the technical field of flow sensing and comprises a main controller, a main pressure detection mechanism and an auxiliary control mechanism; the input end of the main controller is electrically connected with the output end of the main pressure detection mechanism, and the main controller is electrically connected with the multistage auxiliary control mechanisms which are arranged in parallel in a bidirectional mode. Through the sensing control of the main controller and the auxiliary controller, the control of all levels of water flow is more accurate, the structural loss of a pipeline is avoided, and the purposes of pressure reduction and throttling are realized. And moreover, the multistage controller can be set up, so that the whole system can not be crashed due to the error of a certain stage, namely when the certain stage has the error, the stage can be disconnected independently, and the following reducing orifice plate is used.
Description
Technical Field
The utility model belongs to the technical field of flow sensing, concretely relates to adapt to different pressure environment's automatic reducing orifice plate governing system.
Background
In engineering projects, the water flow pressure in a pipeline is often reduced through different modes, and the throttling orifice plate is widely applied to projects needing pressure reduction due to the fact that the throttling orifice plate is easy to mount and dismount and simple in structure. Regarding the use of the orifice plate, especially the multi-stage orifice plate, the engineering needs to determine the stage number of the orifice plate and the inner diameter of each stage of the orifice plate according to the actual condition of the water pressure in the pipeline, but in the current environment, most of the reducing diameters of the orifice plate need to be disassembled and changed in the pipeline, and a small part of the orifice plate can be manually adjusted to reduce the diameter of the orifice plate inside the pipeline by manpower, for example, the publication number is CN113685643A, the name is a reducing orifice plate, a device of the orifice plate capable of realizing artificial reducing diameter is provided, but at present, no automatic regulation scheme aiming at the water pressure in the pipeline in various engineering exists.
Due to the presence of the blocking pressure difference, there is a certain requirement for the use of orifice plates in engineering production in order to prevent cavitation and cavitation. In actual production life, water pressure in the pipeline is invariable not, be in the in-process that constantly changes, when water pressure changes in the environment, we need carry out the change of different aperture orifice plates according to the water pressure after the change, realize effective step-down, and some can come the orifice plate in regulation aperture through outside manpower, also need the manual regulation according to water pressure, the work load has been increaseed with the adjustment to frequent change, can cause the waste of manpower and material resources, and if the adjustment is inaccurate, cavitation and cavitation appear easily, cause the harm to the pipeline.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an automatic reducing orifice plate governing system who adapts to different pressure environment, it can be according to the water pressure of the pipe-line system of locating and the decompression effect that we want to gain, divide multistage throttle step-down automatically, not only divide automatically multistage, all to each level pore diameter preset and revise, accomplish automatically when preventing cavitation and cavitation according to water pressure regulation aperture.
In order to realize the purpose, the utility model adopts the following technical scheme:
an automatic reducing orifice plate adjusting system adapting to different pressure environments comprises a main controller, a main pressure detection mechanism and an auxiliary control mechanism; the input end of the main controller is electrically connected with the output end of the main pressure detection mechanism, the main controller is electrically connected with the multi-stage auxiliary control mechanisms which are arranged in parallel in a two-way mode, and the number of the multi-stage auxiliary control mechanisms is determined according to actual working conditions.
The main pressure detection mechanism is composed of a main water pressure sensor and a main pressure transmitter, the output end of the main water pressure sensor is connected with the input end of the main pressure transmitter, and the output end of the main pressure transmitter is connected with the input end of the main controller. The main pressure detection mechanism is used for detecting the entering water pressure of water flow in the pipeline, the main water pressure sensor acquires a water pressure signal and transmits the water pressure signal to the main pressure transmitter, the main pressure transmitter converts the pressure signal into a standard electric signal and transmits the standard electric signal to the main controller, and the main controller is used for receiving the water pressure signal acquired by the pressure detection mechanism.
The auxiliary control mechanism comprises an auxiliary controller, the auxiliary controller is electrically connected with the main controller in a two-way mode, the input end of the auxiliary controller is sequentially electrically connected with the auxiliary pressure transmitter and the auxiliary water pressure sensor, the auxiliary pressure transmitter and the auxiliary water pressure sensor form a pressure detection mechanism, and the output end reducing adjusting mechanism of the auxiliary controller is connected.
The reducing adjusting mechanism comprises a servo driver, the servo driver is electrically connected with a servo motor, and an output shaft of the servo motor is connected with a rotary turntable of the reducing orifice plate.
The main controller and the auxiliary controller have the same model; the main water pressure sensor and the auxiliary water pressure sensor are in the same model; the models of the main pressure transmitter and the auxiliary pressure transmitter are consistent.
The method comprises the steps that target pressure is input manually from the outside through a main controller, the required number of stages of the reducing orifice plates and the structural parameters of the reducing orifice plates at all stages are calculated through the main controller according to a data system, pressure signals and parameter information are transmitted to an auxiliary controller, the auxiliary controller receives electric signals of an auxiliary pressure detection mechanism, compares the electric signals detected by the auxiliary pressure detection mechanism with pressure signals required by the main controller, judges whether the electric signals are the pressure signals required by the main controller or not, then selects a positive mechanism or a negative mechanism to transmit according to the comparison result, the auxiliary controller transmits instructions to a servo driver, the servo driver converts the electric signals transmitted by the auxiliary controller into signals capable of being received by a servo motor, controls the servo motor to work, drives the reducing orifice plates to contract or expand, so as to adjust the size of the reducing orifice plates, meanwhile, the comparison result is fed back to the main controller, and at the main controller recalculates the aperture of the reducing orifice plates behind the reducing orifice plates according to the comparison result.
Compared with the prior art, the utility model has the advantages that:
through the sensing control of the main controller and the auxiliary controller, the control of all levels of water flow is more accurate, the structural loss of a pipeline is avoided, and the purposes of pressure reduction and throttling are realized. From this, realized according to water pressure to the automatic control of orifice diameter size, replaced the artifical manually operation to different water pressures originally, improved operating system's intelligent degree, water pressure sensor can learn real-time pressure signal simultaneously, is favorable to improving the detection precision of system, optimizes the performance of system. And moreover, the multistage controller can be set up, so that the whole system cannot be crashed due to the fact that a certain stage generates errors, namely when a certain stage generates errors, the stage can be disconnected independently, and the following reducing orifice plate is used.
Drawings
FIG. 1 is a schematic view of an automatic reducing orifice plate adjusting system adapted to different pressure environments;
1-a main controller, 2-a main pressure detection mechanism, 3-a main water pressure sensor, 4-a main pressure transmitter, 5-an auxiliary controller, 6-a servo driver, 7-a servo motor, 8-a reducing orifice plate, 9-an auxiliary water pressure sensor and 10-an auxiliary pressure transmitter.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
As shown in fig. 1, an automatic reducing orifice plate adjusting system adapted to different pressure environments comprises a main controller 1, a main pressure detection mechanism 2 and an auxiliary control mechanism; the input end of the main controller 1 is electrically connected with the output end of the main pressure detection mechanism 2, and the main controller 1 is electrically connected with the multistage auxiliary control mechanisms which are arranged in parallel in a bidirectional mode. The number of stages of the overall regulating system depends on the actual production situation.
Main pressure detection mechanism 2 comprises main water pressure sensor 3 and main pressure transmitter 4, and main water pressure sensor 3's output is connected with main pressure transmitter 4's input, and main pressure transmitter 4's output is connected with main control unit 1's input. The main pressure detection mechanism 2 is used for detecting the entering water pressure of water flow in the pipeline, wherein the main water pressure sensor 3 acquires a water pressure signal and transmits the water pressure signal to the main pressure transmitter 4, the main pressure transmitter 4 converts the pressure signal into a standard electric signal and transmits the standard electric signal to the main controller 1, and the main controller 1 is used for receiving the water pressure signal acquired by the pressure detection mechanism.
The auxiliary control mechanism comprises an auxiliary controller 5, the auxiliary controller 5 is electrically connected with the main controller 1 in a two-way mode, the input end of the auxiliary controller 5 is sequentially electrically connected with an auxiliary pressure transmitter 10 and an auxiliary water pressure sensor 9, the auxiliary pressure transmitter 10 and the auxiliary water pressure sensor 9 form a pressure detection mechanism, the output end of the auxiliary controller 5 is sequentially electrically connected with a servo driver 6 and a servo motor 7, and the output shaft of the servo motor 7 is connected with a rotary turntable of the reducing throttling pore plate 8.
The model of the main controller 1 and the auxiliary controller 5 is FX3U-32MT-ES-A; the models of the main water pressure sensor 3 and the auxiliary water pressure sensor 9 are FST800-1500; the main pressure transmitter 4 and the auxiliary pressure transmitter 103051TG1A2B21AB4K5M5.
The external person inputs target pressure through the main controller 1, the main controller 1 calculates the required number of stages of the reducing throttling orifice plates 8 and structural parameters of the reducing throttling orifice plates 8 at all stages according to a data system, pressure signals and parameter information are transmitted to the auxiliary controller 5, the auxiliary controller 5 receives electric signals of the auxiliary pressure detection mechanism and compares the electric signals detected by the auxiliary pressure detection mechanism with pressure signals required by the main controller 1 to judge whether the electric signals are the pressure signals required by the main controller 1, then a positive mechanism or a negative mechanism is selected according to the comparison result for transmission, the auxiliary controller 5 transmits instructions to the servo driver 6, the servo driver 6 converts the electric signals transmitted by the auxiliary controller 5 into signals capable of being received by the servo motor 7 to control the servo motor 7 to work to drive the reducing throttling orifice plates 8 to contract or expand so as to adjust the size of the reducing throttling orifice plates 8, meanwhile, the comparison result is fed back to the main controller 1, and the main controller 1 recalculates the aperture of the orifice plates behind the stage of the orifice plates according to the comparison result.
The variable diameter can be automatically realized according to water pressure in different pipelines, cavitation or cavitation can not occur due to the existence of blocking pressure difference, and manpower can be completely eliminated. The plurality of water pressure sensors can acquire the actual pressure of water flow in the pipeline in real time and output the actual pressure so as to adjust and adapt to different environments more quickly. The multistage auxiliary controller 5 is arranged, the negative mechanism is included, the actual pressure reduction effect of the structure can be integrated and adjusted, meanwhile, compared with the single-stage controller, the multistage auxiliary controller 5 controls the multistage reducing throttling orifice plate 8, the multistage auxiliary controller cannot cause breakdown of the whole system due to the fact that a certain stage generates errors, namely when a certain stage generates errors, the stage can be disconnected independently, and the reducing throttling orifice plate 8 behind the stage is used.
The main water pressure sensor 3 and the auxiliary water pressure sensor 9 are connected with the inner wall of the pipeline through a support, are perpendicular to the inner wall of the pipeline and are located right above the inner wall of the pipeline, detect actual water pressure in front of each stage of the reducing throttling orifice plates 8 in real time and transmit the actual water pressure to corresponding pressure transmitters. The main controller 1 and the auxiliary controller 5 are fixed on the inner wall of the pipeline through a support.
The working process of the automatic reducing orifice plate adjusting system adapting to different pressure environments comprises the following steps:
before use, the whole system is initialized, all stages of reducing orifice plates 8 are opened to the maximum aperture, and the system is divided into a positive mechanism and a negative mechanism;
the positive mechanism is as follows: when the fluid flows to the main water pressure sensor 3, the main water pressure sensor 3 converts the pressure signal into an electric signal, transmits the electric signal to the main pressure transmitter 4, and transmits the electric signal to the main controller 1 through standardization, so as to display the inlet water pressure to the outside. According to the actual production and life requirements, a pressure standard to be obtained is manually input, the main controller 1 calculates according to a formula function set in a data system, reasonable parameters of all levels and the number of the variable-diameter orifice plates 8 are determined and output to the auxiliary controllers 5 of all levels as electric signals, the auxiliary controllers 5 of all levels transmit the signals to the servo driver 6 after obtaining the signals, the servo driver 6 converts the signals into signals capable of being recognized by the servo motor 7 to control the servo motor 7 to work, and the variable-diameter orifice plates 8 required to be adjusted are driven to contract or expand so as to adjust the aperture size of the variable-diameter orifice plates 8; the initialization state of the unnecessary reducing orifice plate 8 is kept unchanged;
the negative mechanism is as follows: the negative mechanism is built on top of the positive mechanism;
when the set outlet pressure exceeds the pressure reduction range of the n-stage reducing orifice plate 8, displaying error reminding through a screen of the main controller 1;
when the fluid flows to each stage of auxiliary pressure detection mechanism 2, each stage of auxiliary pressure detection mechanism 2 detects the pressure of the actual fluid and transmits the pressure to the corresponding auxiliary controller 5, the actual value is compared with the theoretical value transmitted by the main controller 1 in the auxiliary controller 5, and if the actual value is smaller than the theoretical value, the normal operation is performed; if the actual value of a certain stage is greater than the theoretical value, it is indicated that the previous stage is unstable in pressure reduction, at this time, the auxiliary controller 5 changes according to the actual value, the variable-diameter orifice plate 8 of the current stage is controlled to perform aperture adjustment under the condition that the variable-diameter orifice plate 8 of the current stage does not generate cavitation and cavitation, meanwhile, the auxiliary controller 5 of the current stage feeds data back to the main controller 1, the main controller 1 performs recalculation according to the feedback information, then the latest instructions are transmitted to the auxiliary controllers 5 of the various stages according to the normal mechanism, and the normal mechanism is continued.
Each controller calculates according to a formula function set in the data system, and determines reasonable parameters at each level, specifically:
the main function formula in the data system is set according to the technical provisions of steam-water pipelines of thermal power plants DL/T5054-2016 and the flow-limiting orifice plate of pipelines HG/T20570.15-95, specifically,
cavitation blocking pressure difference: Δ p s ＝F L 2 (p 1 -F f p v )
Wherein, Δ p s To block differential pressure, MPa; p is a radical of 1 The pressure before the orifice plate is MPa; f f Is the critical pressure ratio coefficient; f L The value is 0.9 for the pressure recovery coefficient; p is a radical of v Saturated steam pressure at the corresponding design temperature, MPa; p is a radical of c The thermodynamic critical pressure of the liquid is 22.5MPa.
The number of stages of the reducing orifice plate 8 is as follows:
Δp＝Δp 1 +Δp 2 +Δp 3 +…+Δp n
Δp 1 ＝2Δp 2 ＝4Δp 3 ＝…＝2 n-1 Δp n
wherein Δ p is the total pressure drop; Δ p n Is the nth stage pressure drop;
the aperture of the reducing orifice plate 8 is as follows:
wherein D is k To throttleAperture of the orifice plate, mm; g is the flow passing through the orifice plate, t/h; rho is the density of the liquid, kg/m 3 (ii) a Delta pi is the pressure difference between the front and the back of the reducing orifice plate, MPa, wherein i is the nth stage reducing orifice plate;
thickness of the reducing orifice plate 8:
wherein S is c Is the thickness of the hole plate, mm; k is the sum of the average power of the power,
the structural coefficients of the pore plate are respectively 0.65 and 0.85; d i Is the inner diameter of the pipeline, mm; [ sigma ]] t Allowable stress of the material at the design temperature; p is the design pressure, MPa;
the main controller 1 integrates the pore plate level number and the corresponding aperture size in the corresponding pressure reduction range into the main controller 1 through a data system, and determines reasonable parameters through calculation, so that control signals are accurately transmitted to the auxiliary controllers 5 at all levels.
The utility model discloses when concrete implementation, the rivers that flow to the supplementary water pressure sensor 9 of next-level should be ensured to distance L between two adjacent reducing orifice plates 8 are stable, supplementary water pressure sensor 9 can the precision measurement. Meanwhile, the number n is explained here, in order to prevent the cavitation phenomenon in the pressure reduction process, the pressure which can be reduced by each stage has a certain limit, so the value of n represents the theoretical range of normal pressure reduction which can be realized by the system.
The present invention and the embodiments thereof have been described above, but the description is not limited thereto, and the embodiment shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. In summary, those skilled in the art should understand that they should not be limited to the embodiments described above, and that they can design the similar structure and embodiments without departing from the spirit of the invention.
Claims (7)
1. An automatic reducing orifice plate adjusting system adapting to different pressure environments is characterized by comprising a main controller, a main pressure detection mechanism and an auxiliary control mechanism; the input end of the main controller is electrically connected with the output end of the main pressure detection mechanism, and the main controller is electrically connected with the multistage auxiliary control mechanisms in a bidirectional mode.
2. The automatic reducing orifice plate adjusting system adapting to different pressure environments as claimed in claim 1, wherein: the multiple stages of auxiliary control mechanisms are arranged in parallel.
3. The automatic reducing orifice plate adjusting system adapting to different pressure environments as claimed in claim 1, wherein: the number of the multi-stage auxiliary control mechanisms is determined according to actual working conditions.
4. The automatic reducing orifice plate adjusting system adapting to different pressure environments as recited in claim 1, wherein: the main pressure detection mechanism consists of a main water pressure sensor and a main pressure transmitter, wherein the output end of the main water pressure sensor is connected with the input end of the main pressure transmitter, and the output end of the main pressure transmitter is connected with the input end of the main controller; the main pressure detection mechanism is used for measuring the entering water pressure of water flow in the pipeline, and the main controller is used for receiving a water pressure signal obtained by the pressure detection mechanism.
5. The automatic reducing orifice plate adjusting system adapting to different pressure environments as recited in claim 4, wherein: the auxiliary control mechanism comprises an auxiliary controller, the auxiliary controller is electrically connected with the main controller in a two-way mode, the input end of the auxiliary controller is sequentially electrically connected with the auxiliary pressure transmitter and the auxiliary water pressure sensor, the auxiliary pressure transmitter and the auxiliary water pressure sensor form a pressure detection mechanism, and the output end of the auxiliary controller is connected with the reducing adjusting mechanism.
6. The automatic reducing orifice plate adjusting system adapting to different pressure environments as recited in claim 5, wherein: the reducing adjusting mechanism comprises a servo driver, the servo driver is electrically connected with a servo motor, and an output shaft of the servo motor is connected with a rotary turntable of the reducing throttling orifice plate.
7. The automatic reducing orifice plate adjusting system adapting to different pressure environments as recited in claim 5, wherein: the main controller and the auxiliary controller have the same model; the main water pressure sensor and the auxiliary water pressure sensor are in the same model; the models of the main pressure transmitter and the auxiliary pressure transmitter are consistent.
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| CN202221580423.1U CN217821356U (en) | 2022-06-23 | 2022-06-23 | Automatic reducing orifice plate adjusting system suitable for different pressure environments |
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| CN202221580423.1U CN217821356U (en) | 2022-06-23 | 2022-06-23 | Automatic reducing orifice plate adjusting system suitable for different pressure environments |
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| CN217821356U true CN217821356U (en) | 2022-11-15 |
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| CN202221580423.1U Expired - Fee Related CN217821356U (en) | 2022-06-23 | 2022-06-23 | Automatic reducing orifice plate adjusting system suitable for different pressure environments |
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