CN111015120B - Production method of differential pressure type flowmeter - Google Patents
Production method of differential pressure type flowmeter Download PDFInfo
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- CN111015120B CN111015120B CN201911368804.6A CN201911368804A CN111015120B CN 111015120 B CN111015120 B CN 111015120B CN 201911368804 A CN201911368804 A CN 201911368804A CN 111015120 B CN111015120 B CN 111015120B
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- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
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Abstract
The invention discloses a production method of a differential pressure type flowmeter, which relates to the technical field of flowmeter detection and comprises the following steps of S1, predesign, calculating and designing the structural shape, the position and the connection structure of the differential pressure type flowmeter according to the flow range to be measured, and formulating the production process parameters of the differential pressure type flowmeter; s2, machining, namely finishing the cutting operation and the drilling operation of the raw materials according to the structure and parameter requirements; s3, performing heat treatment, namely completing heat treatment operation of each part in a heat treatment furnace according to the process requirement; s4, welding operation, namely welding all parts to obtain a main structure of the differential pressure type flowmeter product; and S5, assembling and detecting, namely completing the assembling operation of the accessory and the main structure, and then connecting the assembled differential pressure type flowmeter into a test pipe network to detect the detection accuracy of the differential pressure type flowmeter. The production operation mode combining the pre-design and the final detection is favorable for improving the production quality of the differential pressure type flowmeter product and the accuracy of the test result.
Description
Technical Field
The invention relates to the technical field of flowmeter detection, in particular to a production method of a differential pressure type flowmeter.
Background
The types of flowmeters are various, and differential pressure flowmeters are a large type of flowmeters which are widely applied. Differential pressure flowmeters generally consist of a standard throttling device (e.g., a standard orifice plate, also called a throttling element), a pressure-inducing pipeline, a differential pressure transmitter, etc. A standard throttling device is arranged in the pipeline, and due to the local contraction effect of a flow beam of the standard throttling device, the flow speed of fluid in the center of the pipeline is changed, and the static pressure of the fluid is changed along with the change. Because the fluid generates local eddy current loss and frictional resistance loss when flowing through the orifice plate, the static pressure cannot be restored to the original value after the flow is fully restored. The static pressure difference between the front and the rear of the standard throttling device is related to the flow, the larger the flow is, the more remarkable the contraction of the flow beam and the conversion of dynamic and static pressure energy are, and the larger the generated pressure difference is. The flow rate in the pipeline can be determined by measuring the static pressure difference between the front and the rear of the standard throttling device, which is the basic principle of the differential pressure type flowmeter.
Referring to fig. 7 and 8, a main structure of an RC-regulated differential pressure flowmeter includes a main pipe 8, two flange connectors 81 are symmetrically disposed at two ends of the main pipe 8, two flange connectors 82 are symmetrically disposed on a pipe body of the main pipe 8, and a throttle body 83 having a throttle hole 84 is further disposed in the main pipe 8. In the prior art, the differential pressure type flowmeter is mainly produced by machining parts, welding and painting. The differential pressure type flowmeter mainly determines the flow in the pipeline by measuring the static pressure difference between the front and the rear of the throttling body 83, so the influence of the shape of the throttling body 83 and the position, the size and the like of the throttling hole 84 on the throttling body 83 on the accuracy of flow measurement is great, and the influence of the shape, the structural strength and the like of the main pipeline 8, the two-flange joint 81 and the two-flange joint 82 on the detection result of the differential pressure type flowmeter is also great, so the influence of improving the production quality of the differential pressure type flowmeter on the accuracy of the measurement result is very important.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a production method of a differential pressure type flowmeter, which is characterized in that the structural parameters of the differential pressure type flowmeter are designed in advance, the main structure of the differential pressure type flowmeter is obtained by processing according to the structural parameters, and finally, the assembled detection operation is carried out, so that the aims of improving the production quality of the differential pressure type flowmeter and the accuracy of the test result are fulfilled.
The above object of the present invention is achieved by the following technical solutions: a method of producing a differential pressure flowmeter, comprising: s1, predesigned, calculating and designing the structural shape, position and connecting structure of each part of the differential pressure flowmeter according to the flow range to be measured, and formulating the production process parameters of the differential pressure flowmeter according to the calculation result; s2, machining, namely finishing cutting operation and drilling operation of raw materials according to the structure and parameter requirements, and machining to obtain the structure of each part; s3, performing heat treatment, namely completing heat treatment operation of each part in a heat treatment furnace according to the process requirement; s4, welding operation, namely welding all parts to obtain a main structure of the differential pressure type flowmeter product; and S5, assembling and detecting, namely completing the assembling operation of the accessory and the main structure, and then connecting the assembled differential pressure type flowmeter into a test pipe network to detect the detection accuracy of the differential pressure type flowmeter.
By adopting the technical scheme, the designer calculates the better structural parameters of the differential pressure flowmeter according to the environmental conditions to be applied by the produced differential pressure flowmeter, the flow range to be detected and other factors, the manufacturer carries out machining operation, heat treatment operation and welding operation according to the structural parameters so as to obtain the main structure of the differential pressure flowmeter, and finally, the accessory fittings of the differential pressure flowmeter are installed and the simulation detection operation is carried out. The production operation mode combining the pre-design and the final detection is favorable for improving the production quality of the differential pressure type flowmeter product and the accuracy of the test result.
The present invention in a preferred example may be further configured to: in step S1, a computer modeling analysis is performed according to the calculation results, and a database is constructed to record the structural model and the parameter data of the differential pressure type flowmeter under different flow detection requirements.
By adopting the technical scheme, a designer can utilize related information in the database in subsequent design to assist in completing calculation and design work of the differential pressure type flowmeter, and can verify the feasibility of the design scheme of the differential pressure type flowmeter from the source by utilizing a computer to perform modeling analysis.
The present invention in a preferred example may be further configured to: and 3D printing the digital model obtained by computer modeling to obtain an entity model, and carrying out analog detection on the accuracy of the flow detection result of the entity model.
Through adopting above-mentioned technical scheme, adopt 3D printing technique to make the physical model of differential pressure type flowmeter to utilize this physical model to carry out simulation detection, whether satisfy the in-service use demand with judging the design, can further improve the accuracy and the high efficiency of differential pressure type flowmeter in the design link.
The present invention in a preferred example may be further configured to: and constructing a differential pressure flowmeter detection system, wherein the differential pressure flowmeter detection system comprises a test pipeline and a meter clamping device connected into the test pipeline, a pre-calibrated standard flowmeter is connected into the test pipeline, and the meter clamping device is used for connecting the detected flowmeter and comparing and judging whether the error value of the standard flow value and the actually detected flow value is within the standard error range.
By adopting the technical scheme, the detection system can be adopted to simulate the actual use environment no matter in the design link or the detection link after assembly, and the standard flow value of the standard flowmeter is compared with the actual detection value of the detected differential pressure flowmeter so as to judge whether the detected differential pressure flowmeter meets the use requirement. The differential pressure type flowmeter to be detected is accessed into the detection system to simulate the use state of the differential pressure type flowmeter in the actual pipeline, and compare the standard flowmeter in the same test pipeline with the differential pressure type flowmeter to be detected, compared with the traditional water-through detection mode, the detection result is more accurate.
The present invention in a preferred example may be further configured to: the method comprises the steps of connecting a detected flowmeter into a test pipeline, completing a water leakage test under the load state of the test pipeline, changing the pressure and the flow rate of test water flow in the pipeline, recording the test values of a standard flowmeter and the detected flowmeter under different test conditions, and comparing and judging whether the difference value between the test value of the detected flowmeter and the test value of the standard flowmeter is within a standard error range or not under the condition that the test value of the standard flowmeter is within a specified range.
By adopting the technical scheme, the detection link of the differential pressure type flowmeter not only needs to complete detection operation under a stable flow condition, but also needs to complete detection operation under a variable flow condition, namely, multiple groups of detection operations need to be carried out, and the error value change of the standard value and the actual detection value under the fixed flow condition and in the flow change process are comprehensively judged, so that the accuracy and the structural integrity of the detection result of the detected differential pressure type flowmeter are judged.
The present invention in a preferred example may be further configured to: the test pipeline comprises a proper flow pipe, the proper flow pipe comprises a primary pipe group and a secondary pipe group, the primary pipe group comprises a first branch pipe and a second branch pipe which are arranged in parallel, the pipe diameter of the first branch pipe is larger than that of the second branch pipe, the secondary pipe group comprises a third branch pipe and a fourth branch pipe which are arranged in parallel, and the pipe diameter of the third branch pipe is larger than that of the fourth branch pipe; and selecting the first branch pipe and/or the second branch pipe to be connected into the test pipeline, and selecting the third branch pipe or the fourth branch pipe to be connected into the test pipeline.
By adopting the technical scheme, the adaptive flow pipe formed by matching the primary pipe group and the secondary pipe group is connected into the test pipeline to meet the detection requirements of different detection flows, namely, an operator can select the combination of the first branch pipe, the second branch pipe, the third branch pipe and the fourth branch pipe according to the actual detection flow value, and the adaptive flow pipe has better use flexibility and adaptability.
The present invention in a preferred example may be further configured to: the test pipeline comprises a main pipeline and a branch pipeline, a degassing filter is connected in the main pipeline and is connected with the branch pipeline, the branch pipeline comprises a test branch pipe and a filtering branch pipe, and water flow filtered and defoamed by the degassing filter selectively flows into the test branch pipe and the filtering branch pipe; the standard flowmeter and the meter clamping device are connected into the testing branch pipe, the filtering branch pipe and the main pipeline are jointly communicated with a water storage tank to form a circulating pipeline, a filtering device is arranged in the water storage tank, and a water inlet pipe of the water storage tank and a water outlet of the filtering branch pipe are both communicated with the filtering device.
Through adopting above-mentioned technical scheme, operating personnel can select two kinds of different mode of test pipeline according to the user demand, and one is the detection mode of the differential pressure flowmeter who inserts and is detected, and another is the filtration mode that does not insert the differential pressure flowmeter who is detected. In the detection mode, a test branch pipe needs to be selected to be accessed, and the pressure differential flowmeter to be detected is accessed through a meter clamping device; in the filtering mode, it is necessary to select the access filtering branch. In both modes of operation, the air elimination filter serves to filter impurities and eliminate air bubbles from the water, and in the filtration mode, the air elimination filter also serves multiple filtration functions in cooperation with the filtration device in the reservoir.
The present invention in a preferred example may be further configured to: after the parts are subjected to heat treatment operation, performing primary shot blasting treatment on the parts, and performing secondary shot blasting treatment on the main structure after welding the parts and obtaining the main structure of the differential pressure type flowmeter.
Through adopting above-mentioned technical scheme, once throw the ball and mainly play the effect of getting rid of each spare part burr, and the secondary is thrown the ball and mainly is played the effect of getting rid of the burr of the major structure of differential pressure type flowmeter, once throw the ball and throw the ball with the secondary and combine together and can effectively get rid of appearance defects such as burr to improve the quality of differential pressure type flowmeter product.
The present invention in a preferred example may be further configured to: the centralized supply and recovery circulation system for the cutting lubricating oil is established, and comprises a storage tank for storing the cutting lubricating oil, feed pumps for pumping the cutting lubricating oil in the storage tank and supplying the cutting lubricating oil to each processing station through pipelines, a recovery storage device for recovering the cutting lubricating oil is arranged on each processing station, a circulating pump for pumping the cutting lubricating oil in the recovery storage device and sending the cutting lubricating oil into the storage tank through pipelines, and a filtering device for filtering impurities in the cutting lubricating oil is connected between the circulating pump and the storage tank.
Through adopting above-mentioned technical scheme, the cutting lubricating oil liquid in the storage tank is carried to each processing worker station according to the demand distribution to the feed pump, and each processing worker station produced in the production operation in-process reveals the fluid and the fluid after the use can be carried back to corresponding storage tank again under the effect of circulating pump, and at this in-process, filter equipment plays the effect of getting rid of the impurity in the cutting lubricating oil liquid. The centralized supply and recovery circulation system of the cutting lubricating oil is established to realize the centralized distribution supply and the centralized recovery and reuse of the cutting lubricating oil, which is beneficial to reducing the loss of materials and simultaneously improving the timeliness and the high efficiency of material supplement and distribution.
The present invention in a preferred example may be further configured to: and (3) constructing a logistics processing information network, arranging an information collector at each processing station, collecting the processing time and the circulation time of the materials by the information collector, and uploading the processing time and the circulation time to a central control center to construct a complete processing information flow.
By adopting the technical scheme, the time for each processing station to receive the materials, the time for processing the materials and the time for sending the materials are recorded, and a complete processing information flow is formed, so that the operation condition of each processing station can be monitored.
In summary, the invention includes at least one of the following beneficial technical effects:
1. the production operation mode combining the pre-design and the simulation detection is adopted to replace the traditional processing and manufacturing mode, so that the production quality of the differential pressure type flowmeter product and the accuracy of the test result are improved;
2. computer modeling and database aided design, and preparing a physical model for detection by a 3D printing technology so as to improve the structural design accuracy and the production quality of the differential pressure type flowmeter;
3. the detection system of the differential pressure type flowmeter is constructed to simulate the actual use condition of the differential pressure type flowmeter in an access pipeline, and the error value change condition of the standard test value and the actual detection value are compared under the constant flow detection condition and the variable flow detection condition so as to achieve the purpose of comprehensively detecting and judging whether the produced differential pressure type flowmeter meets the use requirement.
Drawings
FIG. 1 is a schematic diagram of a system for centralized feed recovery circulation;
FIG. 2 is a schematic diagram of a sensing system for a differential pressure flow meter;
fig. 3 is a schematic view of a filtering device mainly used for showing a water reservoir;
FIG. 4 is a schematic diagram of the structure of a compliant water pipe;
FIG. 5 is a flow chart of a method of testing a differential pressure flow meter;
FIG. 6 is a flow chart of a method of producing a differential pressure flow meter;
FIG. 7 is a schematic diagram of the main structure of a differential pressure flow meter;
fig. 8 is a cross-sectional schematic view of a differential pressure flowmeter.
In the figure, 1, a centralized supply and recovery circulation system; 11. a storage tank; 12. a supply pump; 13. a circulation pump; 14. a filter; 15. a recovery storage device; 2. a reservoir; 21. a water inlet pipe; 22. a filtration device; 3. testing the pipeline; 31. a main pipeline; 32. a branch pipeline; 321. testing the branch pipe; 322. filtering the branch pipe; 4. a meter clamping device; 5. a water pump; 6. a degassing filter; 7. a water-adapting pipe; 71. a primary pipe group; 711. a first branch pipe; 712. a second branch pipe; 72. a secondary tube group; 721. a third branch pipe; 722. a fourth branch pipe; 8. a main pipeline; 81. a flange interface; 82. a flange joint; 83. a throttle body; 84. an orifice.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The production method of the differential pressure type flowmeter is characterized in that the production operation of the differential pressure type flowmeter is completed in a mode of combining pre-design and simulation detection with processing operation, and the production quality of the differential pressure type flowmeter and the accuracy of a detection result are improved by starting from a design source and two directions of detection after the completion of processing and assembly.
First, before manufacturing the differential pressure type flowmeter, it is necessary to design the structural shapes of the main pipe 8, the two flange connectors 81, the two flange connectors 82, and the throttle body 83 of the differential pressure type flowmeter, the positions of the holes formed thereon and the corresponding connecting structures, especially the forming positions and the sizes of the throttle holes 84 formed on the throttle body 83, and the connecting modes of the throttle body 83 and the main pipe 8 according to the actual requirements, that is, the actual use conditions of the differential pressure type flowmeter and the medium flow value to be detected, as shown in fig. 7 and 8, and perform 3D modeling by a computer according to the calculation structures, and determine the production process parameters. In the design and modeling process, the structural model and the parameter data recorded in the database can be referred to, the adjustment is carried out according to the self requirements, and the completed structural model and the completed parameter data are input into the database again so as to construct and obtain the structural model and the parameter database of the differential pressure type flowmeter under different flow detection requirement conditions and use conditions.
In order to verify the feasibility of the structural design, a detection system of the differential pressure type flowmeter needs to be established, an entity model of a data model is manufactured through a 3D printing technology, the entity model of the differential pressure type printer is connected into the detection system, the detection system simulates the actual use state of the differential pressure type flowmeter, and a detector observes the use condition of the entity model and the detected flow value to judge whether the design is feasible or not. Of course, the design judgment of the differential pressure type flowmeter still needs to be verified by a computer, and the 3D printing modeling test plays a role in assisting the verification of the computer.
Referring to fig. 7 and 8, a machining operation, a heat treatment operation, and a welding operation are performed in sequence, and a specific process flow is as follows: collecting and warehousing raw materials, cutting, milling, drilling, annealing, performing primary shot blasting, welding, performing secondary shot blasting, and polishing. The raw materials required by the production of the differential pressure type flowmeter are processed and prepared by a sawing machine or a linear cutting machine, a drilling machine, a lathe and a milling machine to obtain a primary structure of the main pipeline 8, the two flange connectors 81, the two flange connectors 82 and the throttling body 83; then the steel plate enters an annealing furnace for annealing treatment so as to improve the structural strength and the structural performance of each part; then, the shot blasting operation is finished in a shot blasting machine to remove surface defects such as burrs on the surfaces of all parts; then, welding is performed to obtain the main structure of the differential pressure type flowmeter, and it should be noted that, since the throttle body 83 is located at the middle position inside the main pipe 8, the main pipe 8 is substantially formed by butt welding two half pipes; then the main structure is sent into a shot blasting machine to complete secondary shot blasting operation; and finally, finishing the surface polishing and grinding operation of the main body structure through a polishing and grinding machine to obtain a semi-finished product of the differential pressure type flowmeter.
As shown in fig. 1, cutting lubricating oil is required in cutting operation, drilling operation and milling operation, and a centralized supply and recovery circulation system 1 for the cutting lubricating oil is established to realize centralized distribution supply and recovery and reuse of the cutting lubricating oil. The centralized supply and recovery circulation system 1 comprises a storage tank 11 for storing various types of cutting lubricating oil, and a supply pump 12 for conveying the cutting lubricating oil in the storage tank 11 to each processing station through a pipeline; each processing station is also provided with a recovery storage device 15 for recovering cutting lubricating oil, and a circulating pump 13 for pumping out the cutting lubricating oil in the recovery storage device 15 and sending the cutting lubricating oil into the storage tank 11 through a pipeline, and a filter 14 for filtering impurities in the cutting lubricating oil is connected between the circulating pump 13 and the storage tank 11. The processing work station is including drilling machine, the sawing machine, the wire cutting machine, milling machine and CNC machining center etc. each processing work station self has cutting lubricated fluid circulation feed system, be provided with the level detection sensor in cutting lubricated fluid circulation feed system's fluid jar, through well accuse center, the cooperation of level detection sensor and 12 three realization linkage fluid infusion of charge pump, through reforming transform the fluid circulation system of each processing work station self promptly and combine outside pipe-line system and central control system to realize cutting lubricated fluid's concentrated distribution and supply. The cutting lubricating oil circulating supply system of each processing station can be used in linkage and matching with the centralized supply and recovery circulation system 1, and can be used independently, so that the cutting lubricating oil circulating supply system has better use flexibility.
An information collector is installed at each processing station, and a computer linked with a central control system can be used as the information collector to construct a logistics processing information network, collect the processing time and the circulation time of materials and upload the processing time and the circulation time to a central control center to construct a complete processing information flow.
As shown in fig. 2, after the semi-finished product of the differential pressure type flowmeter is processed, the assembly operation of the auxiliary fittings and the main structure is required to be completed, the auxiliary fittings comprise a valve group, a pressure leading pipe, a sensor and the like, and the differential pressure type flowmeter detection system is reconstructed, and the detection system is not only used for detecting the physical model of the differential pressure type flowmeter obtained after 3D modeling, but also used for detecting the finished product of the differential pressure flowmeter after the completion of the matched assembly. The differential pressure type flowmeter detection system comprises a water storage pool 2 and a test pipeline 3 circularly communicated with the water storage pool 2, a pre-calibrated standard flowmeter and a meter clamping device 4 for connecting differential pressure type flowmeters of different specifications are connected to the test pipeline 3, and a pneumatic meter clamping device can be used as the meter clamping device 4. An operator inserts the detected differential pressure type flowmeter into the testing pipeline 3 through the meter clamping device 4, and records the standard testing value and the actual testing value of the standard flowmeter and the testing flowmeter, thereby achieving the purpose of comprehensively and comprehensively judging the accuracy of the testing result of the differential pressure type flowmeter.
As shown in fig. 2, the test pipeline 3 is communicated with the reservoir 2 to form a main pipeline 31 and a branch pipeline 32, the main pipeline 31 is connected with a water pump 5 and a degassing filter 6, the three groups of water pumps 5 are connected in parallel to extract the stored water in the reservoir 2 and convey the water to the degassing filter 6 through the main pipeline 31 so as to remove impurities and bubbles in the water, the stored water filtered by the degassing filter 6 flows into the test pipeline 3 and the reservoir 2 through the branch pipeline 32, and a circulation pipeline detected by the differential pressure type flowmeter is constructed.
As shown in fig. 2, the branch pipeline 32 includes a testing branch pipe 321 for connecting the air-removing filter 6 and the testing pipeline 3, and a filtering branch pipe 322 for connecting the air-removing filter 6 and the water reservoir 2, and the testing branch pipe 321, the filtering branch pipe 322 and the water outlet of the air-removing filter 6 are communicated in parallel and selectively accessed through a valve. When the operator selects to connect the test branch pipe 321, the detection operation of the differential pressure type flowmeter can be performed, and when the operator selects to connect the filter branch pipe 322, the circulating operation of the water reservoir 2 and the air elimination filter 6 can be realized, so that the purpose of removing impurities and air bubbles in the stored water in the water reservoir 2 is achieved. The specifications of the detected differential pressure type flowmeter are more, so that a plurality of groups of test pipelines 3 need to be established, each group of test pipelines 3 is communicated with the test branch pipe 321 in parallel, and selective access is realized through valves on each test pipeline 3 so as to meet different detection requirements.
Referring to fig. 2 and 4, the water reservoir 2 is connected to an external water source by a water inlet pipe 21, and a filtering device 22 communicated with the water inlet pipe 21 is disposed in the water reservoir 2, and a water filter or the like can be used as the filtering device 22 to filter and remove impurities in water from the source; meanwhile, the testing pipeline 3 is communicated with the filtering device 22 to form a proper flow pipe 7, so that the purpose of removing impurities in the testing pipeline 3 and the detected differential pressure type flowmeter is achieved. The water adaptive flow pipe 7 is designed into a two-stage water return pipeline structure and comprises a first-stage pipe group 71 and a second-stage pipe group 72, the first-stage pipe group 71 comprises a first branch pipe 711 and a second branch pipe 712 which are connected in parallel, the pipe diameter of the first branch pipe 711 is larger than that of the second branch pipe 712, valves are arranged on the first branch pipe 711 and the second branch pipe 712, and an operator can select to access the first branch pipe 711 and the second branch pipe 711 or select to access the first branch pipe 711 and the second branch pipe 712 simultaneously according to actual requirements; the secondary pipe group 72 includes a third branch pipe 721 and a fourth branch pipe 722 connected in parallel, and the pipe diameter of the third branch pipe 721 is larger than that of the fourth branch pipe 722. The test water flow selectively flows into the first branch pipe 711 and/or the second branch pipe 712, and selectively flows into the third branch pipe 721 or the fourth branch pipe 722, so that the test water flow can be adapted to the flow regulation of the test water flow, and the transient change of the flow can be simulated.
As shown in fig. 5, the specific method of use of the differential pressure flowmeter sensing system is as follows:
s1, injecting or supplementing test water into a reservoir 2, and primarily checking the integrity of a pipe network structure of a flowmeter detection system from the outside of a pipeline;
s2, firstly, selecting a filter branch pipe 322 to be connected, completing water filtering and running operation, inputting water flow into a degassing filter 6 under the action of a water pump 5, filtering and defoaming through the degassing filter 6, then enabling the water flow to enter the filter branch pipe 322, and enabling the water flow to flow back into the water storage tank 2; then, selecting an access test branch pipe 321, completing the communication of the test pipeline 3 through a pneumatic meter clamping device, completing a water running test in the no-load state of the test pipe network, in the process, checking the structural integrity of the test pipe network again, recording the test value of the standard flowmeter, and comparing the test value with the theoretical value of the standard flowmeter to judge whether the service state of the standard flowmeter meets the detection requirement;
and S3, connecting the detected differential pressure type flowmeter into the test pipeline 3 through a pneumatic meter clamping device, selecting to connect into the first branch pipe 711 and/or the second branch pipe 712 according to a preset flow value, and selecting to connect into the third branch pipe 721 or the fourth branch pipe 722. Under the condition that the test value of the standard flowmeter is within a specified range, comparing and judging whether the difference value between the test value of the detected flowmeter and the test value of the standard flowmeter is within a standard error range;
s4, changing the pressure and the flow rate of the test water flow in the pipe network, and repeating the step S3 under the conditions of different pressures and flow rates, wherein an operator needs to select to access the first branch pipe 711 and/or the second branch pipe 712 according to the change of the flow rate value, and select to access the third branch pipe 721 or the fourth branch pipe 722;
and S5, closing the test pipeline 3 and dismantling the detected differential pressure type flowmeter.
The present invention is further illustrated below with reference to specific steps, as shown in fig. 6:
s1, predesigned, calculating and designing the structural shape, position and connecting structure of each part of the differential pressure type flowmeter according to the flow range to be measured, formulating the production process parameters of the differential pressure type flowmeter according to the calculation result, and preparing a physical model of the differential pressure type flowmeter through a 3D printing technology for analog detection; s2, machining, namely finishing the cutting operation, the milling operation and the drilling operation of the raw materials according to the structure and parameter requirements to obtain the structure of each part; s3, performing heat treatment, namely completing heat treatment operation of each part in a heat treatment furnace according to process requirements, and performing primary shot blasting after completing the heat treatment operation; s4, welding, namely welding all parts to obtain a main body structure of a differential pressure type flowmeter product, and performing secondary shot blasting treatment and polishing treatment after the welding operation is finished; and S5, assembling and detecting, namely completing the assembling operation of the accessory and the main structure, then connecting the assembled differential pressure type flowmeter into a test pipe network, and detecting the detection accuracy of the differential pressure type flowmeter, wherein the detecting operation comprises the detection under a constant flow state and the detection under a variable flow state.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (6)
1. A method of producing a differential pressure flowmeter, comprising: s1, predesigned, calculating and designing the structural shape, position and connecting structure of each part of the differential pressure flowmeter according to the flow range to be measured, and formulating the production process parameters of the differential pressure flowmeter according to the calculation result; s2, machining, namely finishing cutting operation and drilling operation of raw materials according to the structure and parameter requirements, and machining to obtain the structure of each part; s3, performing heat treatment, namely completing heat treatment operation of each part in a heat treatment furnace according to the process requirement; s4, welding operation, namely welding all parts to obtain a main structure of the differential pressure type flowmeter product; s5, assembling and detecting, namely completing the assembling operation of the accessory and the main body structure, and then connecting the assembled differential pressure type flowmeter into a test pipe network to detect the detection accuracy of the differential pressure type flowmeter;
constructing a differential pressure type flowmeter detection system, wherein the differential pressure type flowmeter detection system comprises a test pipeline (3) and a meter clamping device (4) connected into the test pipeline (3), a pre-calibrated standard flowmeter is connected onto the test pipeline (3), and the meter clamping device (4) is used for connecting into a detected flowmeter and comparing and judging whether the error value of the standard flow value and the actually detected flow value is within the standard error range;
the method comprises the following steps of connecting a detected flowmeter into a test pipeline (3), completing a water running test under the load state of the test pipeline (3), changing the pressure and the flow rate of test water flow in the pipeline, recording the test values of a standard flowmeter and the detected flowmeter under different test conditions, and comparing and judging whether the difference value between the test value of the detected flowmeter and the test value of the standard flowmeter is within a standard error range or not under the condition that the test value of the standard flowmeter is within a specified range; the testing pipeline (3) comprises a flowing adaptation pipeline (7), the flowing adaptation pipeline (7) comprises a first-stage pipeline set (71) and a second-stage pipeline set (72), the first-stage pipeline set (71) comprises a first branch pipe (711) and a second branch pipe (712) which are arranged in parallel, the pipe diameter of the first branch pipe (711) is larger than that of the second branch pipe (712), the second-stage pipeline set (72) comprises a third branch pipe (721) and a fourth branch pipe (722) which are arranged in parallel, and the pipe diameter of the third branch pipe (721) is larger than that of the fourth branch pipe (722); selecting a first branch pipe (711) and/or a second branch pipe (712) to be connected into the test pipeline (3), and selecting a third branch pipe (721) or a fourth branch pipe (722) to be connected into the test pipeline (3);
the test pipeline (3) comprises a main pipeline (31) and a branch pipeline (32), a degassing filter (6) is connected into the main pipeline (31), the degassing filter (6) is connected with the branch pipeline (32), the branch pipeline (32) comprises a test branch pipe (321) and a filtering branch pipe (322), and water flow which is filtered and defoamed by the degassing filter (6) selectively flows into the test branch pipe (321) and the filtering branch pipe (322); the standard flowmeter and the meter clamping device (4) are connected into the testing branch pipe (321), the filtering branch pipe (322) and the main pipeline (31) are communicated with the water storage tank (2) together to form a circulating pipeline, a filtering device (22) is arranged in the water storage tank (2), and the water inlet pipe (21) of the water storage tank (2) and the water outlets of the filtering branch pipe (322) are communicated with the filtering device (22).
2. The method of claim 1, wherein the step of producing a differential pressure flowmeter comprises: in step S1, a computer modeling analysis is performed according to the calculation results, and a database is constructed to record the structural model and the parameter data of the differential pressure type flowmeter under different flow detection requirements.
3. The method of claim 2, wherein the step of producing a differential pressure flowmeter comprises: and 3D printing the digital model obtained by computer modeling to obtain an entity model, and carrying out analog detection on the accuracy of the flow detection result of the entity model.
4. The method of claim 1, wherein the step of producing a differential pressure flowmeter comprises: after the parts are subjected to heat treatment operation, performing primary shot blasting treatment on the parts, and performing secondary shot blasting treatment on the main structure after welding the parts and obtaining the main structure of the differential pressure type flowmeter.
5. The method of claim 1, wherein the step of producing a differential pressure flowmeter comprises: the method comprises the steps of establishing a centralized supply and recovery circulation system (1) for cutting lubricating oil, wherein the centralized supply and recovery circulation system (1) comprises a storage tank (11) for storing the cutting lubricating oil, a supply pump (12) for pumping the cutting lubricating oil in the storage tank (11) and supplying the cutting lubricating oil to each processing station through a pipeline, a recovery storage device (15) for recovering the cutting lubricating oil is arranged on each processing station, a circulating pump (13) for pumping the cutting lubricating oil in the recovery storage device (15) and sending the cutting lubricating oil into the storage tank (11) through a pipeline, and a filtering device (22) for filtering impurities in the cutting lubricating oil is connected between the circulating pump (13) and the storage tank (11).
6. The method of claim 1, wherein the step of producing a differential pressure flowmeter comprises: and (3) constructing a logistics processing information network, arranging an information collector at each processing station, collecting the processing time and the circulation time of the materials by the information collector, and uploading the processing time and the circulation time to a central control center to construct a complete processing information flow.
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