Composite field flow standard device

Abstract

The utility model provides a kind of composite field flow standard device, including oil tank, oil pump being communicated with the bottom of oil tank, flowmeter installation mechanism being communicated with the output end of oil pump, continuous volume system, continuous weighing system;Flowmeter installation mechanism can be clamped multiple test tables and matched standard tables, so that multiple test tables participate in detection together, improve work efficiency, and also can be clamped multiple test tables for detection, higher adaptability;Continuous volume system can make the utility model continuously and uninterruptedly use static volume method;Continuous weighing system can make the utility model continuously and uninterruptedly use static weighing method;Whether it is using which kind of system, work efficiency can be improved;And whether specific use continuous volume system or continuous weighing system can be switched according to field situation, more adaptable.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of liquid flow meter detection, and particularly relates to a composite field flow standard device. BACKGROUND

[0002] Metrology is the eyes of industrial production. Flow metrology is one of components of metrology science and technology, and is closely related to national economy, national defense construction and scientific research. Good work in this regard plays an important role in ensuring product quality, improving production efficiency and promoting the development of science and technology. In today's era of energy crisis and increasingly high degree of industrial production automation, the role of flow meters in the national economy is more obvious. In addition to evaluating the appearance of a flow meter, the core function of the flow meter, i.e., whether the flow value measured by the flow meter is close to the reference flow value (provided by a standard device or a standard meter) and whether the indication is stable, needs to be evaluated. The reference flow value provided by a standard meter is fast and can help detection personnel quickly obtain results, and is very suitable for detection of flow meters with low precision. At the same time, it is not suitable for detection of flow meters with high precision. There are mainly two methods for the standard device to provide a reference flow value, i.e., static weighing method and static volume method. The static weighing method can ignore the influence of oil pressure and temperature on the detection result, but still needs to be static for a certain period of time to stabilize the weighing reading. The static volume method must consider the influence of oil pressure and temperature on the detection result, but cannot be continuously measured and needs to wait for the return of the piston rod. In addition, the existing technology mainly detects a single flow meter to be detected, and the detection efficiency of the flow meter is not high. SUMMARY

[0003] The present application aims to solve the above problems and provides a composite field flow standard device.

[0004] The technical scheme of the present application is as follows: a composite field flow standard device, comprising an oil tank, an oil pump in communication with the bottom of the oil tank, a flow meter mounting mechanism in communication with the output end of the oil pump, a continuous volume system and a continuous weighing system; the flow meter mounting mechanism is in communication with the continuous volume system through a volume valve, in communication with the continuous weighing system through a weighing valve, and in communication with the oil tank through an oil tank valve.

[0005] The flow meter mounting mechanism clamps several test tables or several test tables plus a standard table, comprising a mounting platform, an input pipe fixed at one end of the mounting platform, an output pipe slidingly mounted at the other end of the mounting platform, and a clamping pipe slidingly mounted in the middle of the mounting platform; the input pipe, the output pipe and the clamping pipe are coaxially arranged, and the end portions are provided with clamping connectors; the end portions of the input pipe, the output pipe and the clamping pipe are provided with sealing grooves A; one end of the clamping connector is coaxially sleeved into the corresponding input pipe, output pipe and clamping pipe, the middle part is provided with a mounting step, and the other end is provided with a clamping interface for clamping the test table / standard table; the mounting step is provided with a sealing groove B corresponding to the sealing groove A; the sealing groove A and the sealing groove B are mutually buckled, and a sealing ring is clamped tightly;

[0006] The outer wall of one end of the output pipe is slidingly fitted with a movable vertical plate, the middle part of the outer wall is provided with an external thread, and the other end is provided with a metal hose; the movable vertical plate is fixedly connected with a clamping motor; the external thread is coaxially threadedly driven with a worm gear; the worm gear is axially fixed relative to the movable vertical plate; the output end of the clamping motor is coaxially fixedly connected with a worm; the worm gear and the worm are threadedly driven and matched;

[0007] The movable vertical plate and the lower end of the clamping pipe are both provided with two sliding blocks; the mounting platform is provided with sliding rails slidingly matched with the sliding blocks;

[0008] The movable vertical plate is also provided with a support rod; a sawtooth section is arranged between the two sliding rails; the upper end of the support rod is hingedly connected with the movable vertical plate, and the lower end is matched with the teeth of the sawtooth section;

[0009] The continuous volume system comprises a pneumatic reversing valve and a standard piston mechanism;

[0010] The pneumatic reversing valve comprises a left valve body, an intermediate cylinder and a right valve body; the intermediate cylinder comprises a cylinder body and a cylinder piston rod; a cylinder piston is arranged at the midpoint of the cylinder piston rod; the cylinder piston slides close to the inner wall of the cylinder body; the middle part of the left and right valve bodies is provided with a connecting port A; the left and right valve bodies are provided with a connecting port B and a connecting port C on both sides of the connecting port A; the left and right valve bodies are both provided with a reversing cavity communicated with the connecting port A, a communication cavity A communicated with the connecting port B, and a communication cavity B communicated with the connecting port C; the reversing cavity is communicated with the communication cavity A and the communication cavity B; the communication cavity A and the communication cavity B are arranged in the same direction as the axial direction of the cylinder piston rod; the reversing cavity is provided with a tapered valve core A and a tapered valve core B corresponding to the communication cavity A and the communication cavity B respectively; the tapered valve core A and the tapered valve core B are coaxially connected with the end part of the cylinder piston rod through a valve rod after being connected;

[0011] The standard piston mechanism comprises a piston cylinder, a standard piston rod, a constant temperature ring and a piston end cover; the standard piston rod is sleeved in the piston cylinder; the piston cylinder is provided with the piston end cover at both ends through the constant temperature ring; the standard piston rod penetrates through the constant temperature ring and the piston end cover at both ends;

[0012] A standard piston is arranged at the middle of the standard piston rod; the standard piston slides close to the inner wall of the piston cylinder; a speed reduction ring is sleeved on the standard piston rod at both sides of the standard piston; a speed reduction groove is arranged on the inner end face of the piston end cover and matches the speed reduction ring;

[0013] Constant temperature holes are distributed on the circumference of the end of the piston cylinder and penetrate the inner wall of the piston cylinder; a constant temperature groove is arranged on the constant temperature ring and communicates with the constant temperature holes; a constant temperature interface is arranged on the circumferential surface of the constant temperature ring and communicates with the constant temperature groove;

[0014] The piston cylinder is divided into piston cavity A and piston cavity B by the standard piston; the piston cylinder end is provided with piston interface A and piston interface B which communicate with the piston cavity A, and piston interface C and piston interface D which communicate with the piston cavity B;

[0015] The volume valve is connected to the connection port A of the right valve body; the connection port B of the right valve body is connected to the piston interface D; the connection port C of the right valve body is connected to the piston interface B; the connection port A of the left valve body is connected to the oil tank; the connection port B of the left valve body is connected to the piston interface A; the connection port C of the left valve body is connected to the piston interface C;

[0016] The continuous weighing system comprises a reversing mechanism and a weighing mechanism; the reversing mechanism is provided with two branch pipes; the oil is driven by the reversing mechanism to switch in the two branch pipes; the weighing mechanism has two; each weighing mechanism comprises a weighing tank and a scale connected in series; the bottom of the weighing tank is connected with an outlet pipeline; the outlet pipeline is provided with a drain valve; the weighing tanks of the two weighing mechanisms are arranged below the branch pipe orifices in correspondence; the oil entering the branch pipe falls into the corresponding weighing tank.

[0017] Preferably, the test meter and the standard meter are connected with thermometers at both ends; the oil tank is a variable temperature oil tank.

[0018] Preferably, the input pipe is connected with a rectifier and an adjusting valve in sequence; the metal hose is connected with a mounting valve A.

[0019] Preferably, the input end of the oil pump is communicated with a filter A; the filter A is communicated with the oil tank through an oil tank outlet valve; the output end of the oil pump is communicated with a check valve; the check valve is communicated with the input pipe and is directed in the same direction as the output direction of the oil pump.

[0020] Preferably, the pipeline of the oil pump leading to the input pipe is provided with a filter B and a mounting valve B in sequence.

[0021] Preferably, an overflow valve is further arranged between the oil pump and the input pipe; the output end of the overflow valve leads to the oil tank.

[0022] Preferably, the composite on-site flow standard device is further provided with a spare joint.

[0023] Preferably, the sawtooth segments are provided with partitions on both sides.

[0024] Preferably, a thermometer is also arranged in the weighing tank.

[0025] The beneficial effects of the present application are: the composite field flow standard device of the present application comprises an oil tank, an oil pump communicated with the bottom of the oil tank, a flowmeter mounting mechanism communicated with the output end of the oil pump, a continuous volume system and a continuous weighing system; the flowmeter mounting mechanism can clamp multiple test meters and matched standard meters, so that multiple test meters participate in detection together, work efficiency is improved, and the adaptability is higher; the continuous volume system can enable the present application to continuously and uninterruptedly use the static volume method; the continuous weighing system can enable the present application to continuously and uninterruptedly use the static weighing method; no matter which system is used, the work efficiency can be improved; and whether the continuous volume system or the continuous weighing system is used can be switched according to the field situation, and the adaptability is stronger. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a structural schematic view of the composite field flow standard device of the present application;

[0027] Figure 2 is a sectional view of the flowmeter mounting mechanism;

[0028] Figure 3 is a front view of Figure 2 ;

[0029] Figure 4 is an A-A sectional view of Figure 3 ;

[0030] Figure 5 is a B-B sectional view of Figure 3 ;

[0031] Figure 6 is a sectional view of the standard piston mechanism;

[0032] Figure 7 is an axial sectional view of Figure 6 ;

[0033] Figure 8 is a C-C sectional view of Figure 7 ;

[0034] Figure 9 is a perspective view of the piston cylinder;

[0035] Figure 10 is a perspective view of the thermostat ring;

[0036] Figure 11 is a perspective view of the piston end cover;

[0037] Figure 12 is a perspective view of the pneumatic reversing valve;

[0038] Figure 13 isFigure 12 a front view of the main section;

[0039] Fig. 01. the test table, 02. the standard table, 03. the thermometer, 1. the oil tank, 11. the oil tank valve, 2. the oil pump, 21. the one-way valve, 3. the flow meter installation mechanism, 31. the installation platform, 311. the sliding rail, 312. the sawtooth section, 313. the partition, 32. the input pipe, 321. the rectifier, 322. the regulating valve, 33. the output pipe, 331. the movable vertical plate, 3311. the clamp motor, 3312. the worm, 3313. the support rod, 332. the external thread, 3321. the worm wheel, 333. the metal hose, 3331. the installation valve A, 34. the clamp pipe, 341. the sliding block, 35. the clamp connector, 36. the sealing groove A, 37. the installation step, 371. the sealing groove B, 38. the clamp interface, 39. the sealing ring, 4. the continuous volume system, 40. the volume valve, 41. the pneumatic reversing valve, 411. the left valve body, 4111. the connection port A, 41111. the reversing cavity, 4112. the connection port B, 41121. the communication cavity A, 4113. the connection port C, 41131. the communication cavity B, 41141. the tapered valve core A, 41142. the tapered valve core B, 41143. the valve rod, 412. the intermediate cylinder, 4121. the cylinder body, 4122. the cylinder piston rod, 41221. the cylinder piston, 413. the right valve body, 414. the air source interface, 42. the standard piston mechanism, 421. the piston cylinder, 4211. the constant temperature hole, 4212. the piston cavity A, 42121. the piston interface A, 42122. the piston interface B, 4213. the piston cavity B, 42131. the piston interface C, 42132. the piston interface D, 422. the standard piston rod, 4221. the standard piston, 4222. the speed reduction ring, 423. the constant temperature ring, 4231. the constant temperature groove, 4232. the constant temperature interface, 424. the piston end cover, 4241. the speed reduction groove, 5. the continuous weighing system, 50. the weighing valve, 51. the reversing mechanism, 511. the branch pipe, 521. the weighing tank, 5211. the outlet pipeline, 5212. the oil drain valve, 522. the scale, 6. the filter A, 7. the filter B, 8. the installation valve B, 9. the overflow valve, 10. the spare joint. DETAILED DESCRIPTION

[0040] Embodiment: see Figures 1-13 A composite field flow standard device, comprising an oil tank, an oil pump in communication with the bottom of the oil tank, a flow meter installation mechanism in communication with the output end of the oil pump, a continuous volume system, and a continuous weighing system; the flow meter installation mechanism is in communication with the continuous volume system through a volume valve, in communication with the continuous weighing system through a weighing valve, and in communication with the oil tank through an oil tank valve; the volume valve, the weighing valve, and the oil tank valve are used to control the flow of oil, facilitating installation.

[0041] The flowmeter mounting mechanism clamps several test meters or several test meters plus a standard meter, comprising a mounting platform, an input pipe fixed at one end of the mounting platform, an output pipe slidingly mounted at the other end of the mounting platform, and a clamping pipe slidingly mounted in the middle of the mounting platform; the input pipe, the output pipe and the clamping pipe are coaxially arranged, and the end portions are provided with clamping connectors; the end portions of the input pipe, the output pipe and the clamping pipe are provided with sealing grooves A; one end of the clamping connector is coaxially sleeved into the corresponding input pipe, output pipe and clamping pipe, the middle part is provided with a mounting step, and the other end is provided with a clamping interface for clamping the test meter / standard meter; the mounting step is provided with a sealing groove B corresponding to the sealing groove A; the sealing groove A and the sealing groove B are mutually buckled, and a sealing ring is clamped; the clamping pipe can be replaced according to the specifications and models of the test meter / standard meter; after replacement, the clamping connector is coaxially and sealingly mounted through the sealing ring, the sealing groove A and the sealing groove B, and only needs to be subjected to axial limiting force; while the sliding output pipe and the clamping pipe can only ensure the coarse positioning of the clamped test meter and standard meter; however, it should be noted that the inner wall of the clamping pipe also changes with the specifications and models of the test meter / standard meter to adapt to the flow requirements of the corresponding test meter / standard meter;

[0042] The end of the output pipe is slidingly fitted with a movable vertical plate, the middle part is provided with an external thread, and the other end is provided with a metal hose; the movable vertical plate provides support for the output pipe; the metal hose is used to adapt to the movement of the output pipe; the movable vertical plate is fixedly connected with a clamping motor; the external thread is coaxially threadedly driven by a worm gear; the worm gear is axially fixed relative to the movable vertical plate; the output end of the clamping motor is coaxially fixed with a worm; the worm gear and the worm are threadedly driven; the clamping motor tends to rotate the worm, which drives the worm gear to rotate; the rotation of the worm gear drives the end of the output pipe to move through the external thread for fine positioning; due to the one-way nature of the worm gear and the worm, the clamping of the test meter and the standard meter is stable after the connection relationship is established;

[0043] The movable vertical plate and the lower end of the clamping pipe are each provided with two sliding blocks; the mounting platform is provided with sliding rails slidingly fitted with the sliding blocks, so that the sliding of the clamping pipe and the output pipe is more convenient, and the clamping pipe and the output pipe are limited; through the cooperation of the sliding rails and the sliding blocks, the number of test meters can be adjusted;

[0044] The movable vertical plate is also provided with a support rod; a sawtooth section is arranged between the two sliding rails; the upper end of the support rod is hingedly connected with the movable vertical plate, and the lower end is matched with the teeth of the sawtooth section; under normal circumstances, when the flowmeter mounting mechanism is coarsely positioned, the support rod will not fall into the teeth of the sawtooth section, but will be placed above the teeth; when the flowmeter mounting mechanism is finely positioned, the movable vertical plate drives the support rod to move backward slightly, and the lower end of the support rod falls into the teeth of the sawtooth section to form stable support for clamping the test meter and the precision meter;

[0045] The continuous volume system comprises a pneumatic reversing valve and a standard piston mechanism;

[0046] The pneumatic reversing valve comprises a left valve body, an intermediate cylinder and a right valve body; the intermediate cylinder comprises a cylinder cylinder body and a cylinder piston rod; the cylinder cylinder body is provided with a gas source interface for connecting a high-pressure gas source to drive the cylinder piston rod to act; a cylinder piston is arranged at the midpoint of the cylinder piston rod; the cylinder piston slides closely against the inner wall of the cylinder cylinder body; the middle part of the left and right valve bodies is provided with a connecting port A; the left and right valve bodies are provided with a connecting port B and a connecting port C on both sides of the connecting port A; the left and right valve bodies are provided with a reversing cavity communicated with the connecting port A, a communication cavity A communicated with the connecting port B and a communication cavity B communicated with the connecting port C; the reversing cavity is communicated with the communication cavity A and the communication cavity B; the communication cavity A and the communication cavity B are arranged in the same direction as the axial direction of the cylinder piston rod; the reversing cavity is provided with a conical valve core A and a conical valve core B corresponding to the communication cavity A and the communication cavity B respectively; the conical valve core A and the conical valve core B are coaxially connected to the end part of the cylinder piston rod through a valve rod;

[0047] The standard piston mechanism comprises a piston cylinder body, a standard piston rod, a constant temperature ring and a piston end cover; the standard piston rod is sleeved in the piston cylinder body; the piston cylinder body is provided with the piston end cover at both ends through the constant temperature ring; the standard piston rod penetrates through the constant temperature ring and the piston end cover at both ends;

[0048] The midpoint of the standard piston rod is provided with a standard piston; the standard piston slides closely against the inner wall of the piston cylinder body; the standard piston rod on both sides of the standard piston is sleeved with a speed reduction ring; the inner end face of the piston end cover is provided with a speed reduction groove matched with the speed reduction ring; when the speed reduction ring is pressed into the speed reduction groove, the residual oil in the speed reduction groove will buffer the standard piston rod in the closed space, so as to ensure that the standard piston will not fall to the bottom of the piston cylinder body, causing the failure of continuous action of the piston;

[0049] The end part of the piston cylinder body is circumferentially distributed with constant temperature holes penetrating through the inner wall of the piston cylinder body; the constant temperature ring is provided with constant temperature grooves communicated with the constant temperature holes; the circumferential surface of the constant temperature ring is provided with constant temperature interfaces communicated with the constant temperature grooves; the constant temperature holes can flow with constant temperature liquid, so as to eliminate the influence of temperature on the oil liquid using the static volume method;

[0050] The piston cylinder body is divided into a piston cavity A and a piston cavity B by the standard piston; the end part of the piston cylinder body is provided with a piston interface A and a piston interface B communicated with the piston cavity A, and a piston interface C and a piston interface D communicated with the piston cavity B;

[0051] The volume valve is communicated with the connecting port A of the right valve body; the connecting port B of the right valve body is communicated with the piston interface D; the connecting port C of the right valve body is communicated with the piston interface B; the connecting port A of the left valve body is communicated with the oil tank; the connecting port B of the left valve body is communicated with the piston interface A; the connecting port C of the left valve body is communicated with the piston interface C;

[0052] The intermediate cylinder is actuated to switch the flow direction of the oil liquid into the piston cylinder body, so that the reversing of the standard piston does not affect the detection of the detected table using the static volume method;

[0053] The continuous weighing system comprises a reversing mechanism and a weighing mechanism; the reversing mechanism is provided with two branch pipes; oil is driven by the reversing mechanism to switch flow in the two branch pipes; the weighing mechanism has two; each weighing mechanism comprises a weighing tank and a scale connected in sequence; the bottom of the weighing tank is connected with an outlet pipeline; the outlet pipeline is provided with a drain valve; the weighing tanks of the two weighing mechanisms are arranged correspondingly below the branch pipe orifices; oil entering the branch pipes falls into the corresponding weighing tanks;

[0054] The oil is driven by the reversing mechanism to reverse; the two weighing tanks alternately receive oil for weighing measurement to achieve the effect of continuous weighing, so that the efficiency of static weighing method is greatly improved; because a weighing tank is waiting for the scale to be stationary, the other weighing tank is entering oil.

[0055] The test meter and the standard meter are connected with thermometers; the oil tank is a variable temperature oil tank; the variable temperature oil tank is prior art (the variable temperature oil tank of the liquid flow standard device disclosed in the utility model patent with publication number CN206362005U has been disclosed), which is used for heating or cooling the oil, and the thermometer is used for detecting whether the oil in the test meter and the standard meter is close to the use temperature and meets the use condition.

[0056] The input pipe is connected with a rectifier and an adjusting valve in sequence; the rectifier is used for stabilizing the flow of the oil to avoid the impact of the oil on the test meter and the standard meter; the adjusting valve is used for controlling the flow rate of the oil; the metal hose is connected with a mounting valve A for easy installation.

[0057] The oil pump is communicated with a filter A at the input end, which is used for filtering the oil entering the oil pump to protect the oil pump; the filter A is communicated with the oil tank through an oil tank outlet valve for easy installation; the output end of the oil pump is communicated with a check valve; the check valve is communicated with the input pipe and has the same direction as the output direction of the oil pump; the check valve is used for avoiding the backflow of the oil to damage the oil pump.

[0058] The pipeline of the oil pump leading to the input pipe is provided with a filter B and a mounting valve B in sequence; the filter B is used for further filtering to protect the test meter and the standard meter; the mounting valve B is used for easy installation.

[0059] An overflow valve is further arranged between the oil pump and the input pipe; the output end of the overflow valve leads to the oil tank; the overflow valve is used for avoiding overpressure of the oil in the pipeline to damage the test meter and the standard meter.

[0060] The composite on-site flow standard device is further provided with a standby joint, which can further expand the function, discharge the oil, and be used for sampling the oil.

[0061] The sawtooth section is provided with a partition plate on both sides to horizontally limit the support rod.

[0062] A thermometer is further arranged in the weighing tank to monitor the temperature of the oil.

[0063] The working process of the embodiment is as follows:

[0064] The working state of the embodiment has three kinds, which are respectively for coarse precision flowmeter detection, volume unit flow reading high precision flowmeter detection, and weight unit flow reading high precision flowmeter detection. However, no matter which kind, clamping of the detected meter / standard meter is needed. The clamping process is as follows:

[0065] ①According to the number and specifications of the detected meter / standard meter, the number of spliced clamping pipes and the type of spliced connecting pipes are selected, and the positions of the spliced clamping pipes and output pipes are planned. First, the spliced connecting pipes are installed into the corresponding input pipes, output pipes and spliced clamping pipes.

[0066] ②Then, the installation is carried out by using the sliding block and sliding rail. First, the spliced clamping pipes are installed, and then the output pipes are installed. Then, the spliced clamping pipes and output pipes are moved to the corresponding positions.

[0067] ③The corresponding detected meter / standard meter is clamped by using the spliced connecting pipe. At this time, the lower end of the supporting rod should be above the sawtooth section and not fall into the teeth of the sawtooth section.

[0068] ④The spliced connecting pipe is tightly attached to the corresponding input pipe, output pipe and spliced clamping pipe by driving the spliced motor. Note that the sealing ring should be clamped in the sealing groove. At this time, the movable vertical plate will have a certain backward movement relative to the output pipe, which will make the lower end of the supporting rod fall into the teeth of the sawtooth section, so that the movable vertical plate is fixed in position.

[0069] ⑤The metal hose is adaptively adjusted according to the displacement of the output pipe.

[0070] Coarse precision flowmeter detection:

[0071] A standard meter must be clamped in the above process. At this time, the oil tank valve is opened, and the volume valve and the weighing valve are closed. The oil pump extracts the oil in the oil tank, so that the oil passes through each detected meter and the standard meter, and finally returns to the oil tank. The reading of the standard meter is used as a reference for detecting the detected meter.

[0072] Volume unit flow reading high precision flowmeter detection:

[0073] The volume valve is opened, and the oil tank valve and the weighing valve are closed. The oil pump extracts the oil in the oil tank, so that the oil passes through each detected meter and enters the pneumatic reversing valve through the connecting port A of the right valve body. See Figure 1, assuming the left and right valve body of the tapered valve core A sealing communication cavity A, the oil will follow the right side of the valve body of the connection port C, piston interface A into the piston cavity A, and the left side of the valve body of the communication cavity A is blocked, only to push the standard piston to the right; Standard piston right to move the volume of the oil can be converted to flow; Because the constant temperature hole in the flow of the constant temperature liquid corresponding to the oil temperature; The oil in the piston cylinder is kept warm, and there is no need to worry about the influence of the expansion coefficient; The right push of the standard piston will push the oil that may exist in the piston cavity B through the piston interface C, the left side of the valve body of the connection port C, the connection port A back to the oil tank; Similarly, the middle cylinder drives the left and right valve body of the tapered valve core B to seal the communication cavity B, and the volume of the oil flowing can be converted by the left moving distance of the standard piston; The total volume of the oil flowing in the period can be calculated by adding the moving distance of the standard piston, and then the average flow of the oil is calculated as the reference value detected by the detector table;

[0074] When the flowmeter mounting mechanism clamps several detector tables and a standard table, the standard table quickly gives a qualitative reference that the reading of the detector table is greater than or less than the actual flow of the oil, and the continuous volume system gives a specific reference value detected by the detector table, which is used to calculate the difference between the reading of the detector table and the actual flow of the oil, that is, the measurement accuracy of the detector table;

[0075] High-precision flowmeter detection of weight unit flow reading:

[0076] Open the weighing valve, close the oil tank valve, and the oil tank valve; The oil pump extracts the oil in the oil tank, so that the oil passes through each detector table and the standard table, and then enters the reversing mechanism; The reversing mechanism determines the reversing according to whether the oil entering the weighing tank approaches the range limit of each weighing instrument; After each reversing, the weighing tank that approaches the range limit is placed to stabilize the reading of the weighing instrument, and then the oil is discharged back to the oil tank; After a period of time, the total weight of the oil flowing through the detector table in the period is obtained by superimposing the historical readings of each weighing instrument; The average flow obtained by dividing the total weight by the time can be used as a reference value for detecting the detector table;

[0077] When the flowmeter mounting mechanism clamps several detector tables and a standard table, the standard table quickly gives a qualitative reference that the reading of the detector table is greater than or less than the actual flow of the oil, and the continuous weighing system gives a specific reference value detected by the detector table, which is used to calculate the difference between the reading of the detector table and the actual flow of the oil, that is, the measurement accuracy of the detector table.

Claims

1. A composite field flow standard apparatus comprising a tank, a pump in communication with the bottom of the tank, a flow meter mounting mechanism in communication with the output of the pump, a continuous volume system, a continuous weighing system; characterized in that, The flow meter mounting mechanism is communicated with the continuous volume system through a volume valve, communicated with the continuous weighing system through a weighing valve, and communicated with the oil tank through an oil tank valve; The flow meter mounting mechanism clamps a plurality of tested meters or a plurality of tested meters plus a standard meter, and includes a mounting platform, an input pipe fixed at one end of the mounting platform, an output pipe slidably mounted at the other end of the mounting platform, and a clamping pipe slidably mounted in the middle of the mounting platform; the input pipe, the output pipe and the clamping pipe are coaxially arranged, and each end is provided with a clamping connector; each end of the input pipe, the output pipe and the clamping pipe is provided with a sealing groove A; one end of the clamping connector is coaxially sleeved into the corresponding input pipe, output pipe and clamping pipe, the middle part is provided with a mounting step, and the other end is provided with a clamping interface for clamping the tested meter / standard meter; the mounting step is provided with a sealing groove B corresponding to the sealing groove A; the sealing groove A and the sealing groove B are mutually buckled, and a sealing ring is clamped; One end of the output pipe is slidably connected with a movable vertical plate, the middle part is provided with an external thread, and the other end is provided with a metal hose; the movable vertical plate is fixedly connected with a clamping motor; the external thread is coaxially threadedly connected with a worm gear; the worm gear is axially fixed relative to the movable vertical plate; the output end of the clamping motor is coaxially fixedly connected with a worm; the worm gear and the worm are threadedly connected; The movable vertical plate and the clamping pipe are each provided with two sliding blocks; the mounting platform is provided with sliding rails slidably connected with the sliding blocks; The movable vertical plate is further provided with a support rod; a sawtooth section is arranged between the two sliding rails; the upper end of the support rod is hingedly connected with the movable vertical plate, and the lower end is matched with the teeth of the sawtooth section; The continuous volume system includes a pneumatic reversing valve and a standard piston mechanism; The pneumatic reversing valve includes a left valve body, an intermediate cylinder and a right valve body; the intermediate cylinder includes a cylinder body and a cylinder piston rod; a cylinder piston is arranged at the midpoint of the cylinder piston rod; the cylinder piston slides close to the inner wall of the cylinder body; the middle part of the left and right valve bodies is provided with a connecting port A; the left and right valve bodies are each provided with a connecting port B and a connecting port C on both sides of the connecting port A; each of the left and right valve bodies is provided with a reversing cavity communicated with the connecting port A, a communication cavity A communicated with the connecting port B, and a communication cavity B communicated with the connecting port C; the reversing cavities are respectively communicated with the communication cavity A and the communication cavity B; the communication cavity A and the communication cavity B are arranged in the same direction as the axial direction of the cylinder piston rod; the reversing cavities are provided with a tapered valve core A and a tapered valve core B corresponding to the communication cavity A and the communication cavity B respectively; the tapered valve core A and the tapered valve core B are coaxially connected with the end part of the cylinder piston rod through a valve rod after being connected; The standard piston mechanism includes a piston cylinder, a standard piston rod, a constant temperature ring, and a piston end cover; the standard piston rod is sleeved in the piston cylinder; the piston cylinder is provided with the piston end cover through the constant temperature ring at both ends; the standard piston rod penetrates through the constant temperature ring and the piston end cover at both ends; The midpoint of the standard piston rod is provided with a standard piston; the standard piston slides close to the inner wall of the piston cylinder; the standard piston rod on both sides of the standard piston is sleeved with a speed reduction ring; the inner end surface of the piston end cover is provided with a speed reduction groove corresponding to the speed reduction ring; The end part of the piston cylinder is circumferentially provided with a constant temperature hole penetrating the inner wall of the piston cylinder; the constant temperature ring is provided with a constant temperature groove communicated with the constant temperature hole; the circumferential surface of the constant temperature ring is provided with a constant temperature connector communicated with the constant temperature groove. The piston cylinder is divided into piston cavity A and piston cavity B by a standard piston; the piston cylinder end is provided with piston interface A and piston interface B which communicate with piston cavity A, and piston interface C and piston interface D which communicate with piston cavity B; The volume valve is connected with the connection interface A of the right valve body; the connection interface B of the right valve body is connected with piston interface D; the connection interface C of the right valve body is connected with piston interface B; the connection interface A of the left valve body is connected with the oil tank; the connection interface B of the left valve body is connected with piston interface A; the connection interface C of the left valve body is connected with piston interface C; The continuous weighing system comprises a reversing mechanism and weighing mechanisms; the reversing mechanism is provided with two branch pipes; the oil is driven by the reversing mechanism to switch in the two branch pipes; the weighing mechanisms are two; each weighing mechanism comprises a weighing tank and a scale which are connected in sequence; the weighing tank is connected with an outlet pipeline; the outlet pipeline is provided with a drain valve; the weighing tanks of the two weighing mechanisms are arranged below the branch pipe orifices in correspondence; the oil entering the branch pipes falls into the corresponding weighing tanks.

2. The composite primary flow standard apparatus of claim 1, wherein: The tested meter and the standard meter are connected with thermometers at two ends; the oil tank is a variable temperature oil tank.

3. The composite primary flow standard apparatus of claim 1, wherein: The input pipe is connected with a rectifier and an adjusting valve in sequence; the metal hose is connected with an installation valve A.

4. The composite primary flow standard apparatus of claim 1, wherein: The oil pump input end is communicated with a filter A; the filter A is communicated with the oil tank through an oil tank outlet valve; the oil pump output end is communicated with a check valve; the check valve is communicated with the input pipe and the guide is the same as the output direction of the oil pump.

5. The composite primary flow standard apparatus of claim 1, wherein: The pipeline of the oil pump to the input pipe is provided with a filter B and an installation valve B in sequence.

6. The composite primary flow standard apparatus of claim 5, wherein: An overflow valve is further arranged between the oil pump and the input pipe; the output end of the overflow valve is communicated with the oil tank.

7. The composite primary flow standard apparatus of claim 1, wherein: A spare joint is further arranged.

8. The composite primary flow standard of claim 1, wherein: The sawtooth section is provided with a partition plate on both sides.

9. The composite primary flow standard of claim 1, wherein: A thermometer is further arranged in the weighing tank.

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