CN106197623A - A kind of positive displacement high-pressure flowmeter based on weight method demarcates hydraulic system and experimental technique - Google Patents

Abstract

The invention discloses a volumetric high-pressure flowmeter calibration hydraulic system based on a weighing method and an experimental method; the hydraulic system of the experimental device of the invention is composed of a pump source component and a weighing method flowmeter calibration system component. By adjusting the opening pressure of the direct-acting relief valve, the K coefficient calibration of the flowmeter under different pressures is completed; by adjusting the displacement of the high-pressure plunger variable pump, the K coefficient calibration of the flowmeter under different flow rates is completed; by changing the hydraulic pressure The medium of the system is used to complete the calibration of the K coefficient of the flowmeter with different viscosities. The hydraulic system and the experimental method of the invention can complete the calibration of K coefficients of the flowmeters with different pressures, different flow rates and different viscosities. Instrument manufacturers can use this hydraulic system and experimental method to give the calibration value of the K coefficient of the flowmeter for each factory flowmeter with different pressures, different flows, and different viscosities. Users can determine the K coefficient of the flowmeter according to their actual hydraulic system. coefficient, which can improve the accuracy of the flowmeter.

Description

Calibration hydraulic system and experiment of volumetric high pressure flowmeter based on weighing method method

technical field

The invention relates to a weighing method-based high-pressure volumetric flowmeter calibration hydraulic system and an experimental method, in particular to the technical field of volumetric flowmeter calibration.

Background technique

Volumetric flowmeter, also known as fixed displacement flowmeter, or PD flowmeter for short, is the most accurate type of flowmeter. It uses mechanical measuring elements to continuously divide the fluid into a single known volume, and measures the total volume of the fluid according to the number of times the measuring chamber is filled and discharged with the volume of fluid. The calibration of volumetric flowmeters usually adopts volume method and weighing method. The general volumetric flowmeter calibration system is to calibrate low-pressure flowmeters. There is no good solution for the calibration of high-pressure volumetric flowmeters. .

For above these situations, the present invention has designed " a kind of high-pressure volumetric flowmeter calibration hydraulic system and experimental method based on weighing method ", and this invention can finish the calibration experiment of following volumetric flowmeter: (1) the liquid of different viscosities Calibration experiment of medium volumetric flowmeter; (2) Calibration experiment of volumetric flowmeter under different pressures; (3) Calibration experiment of volumetric flowmeter under different flow rates. The hydraulic system of the present invention is also designed with a self-circulating filter system.

Contents of the invention

The working principle of the gear flowmeter is that when a liquid passes through the gear flowmeter, the gear will rotate with the flow of the liquid, convert the flow signal of the fluid into the speed signal of the gear, and then extract the speed signal of the flowmeter gear through the non-contact gear speed sensor. Then the rotational speed signal is transformed into the flow signal of the flowmeter. Since the speed sensor and the measured gear of the gear flowmeter are separated by the casing of the flowmeter (non-magnetic), the measured gear can be made of magnetically conductive materials or non-magnetically conductive materials. If it is made of non-magnetically conductive A certain number of holes need to be processed on the end face of the gear, and then a magnetic material is loaded into the holes. When the flow passes through the flowmeter, the gear in the flowmeter will rotate. When the magnetic conductor passes through the gear speed sensor, the gear speed sensor will have a high level. By counting the number of high levels of the gear speed sensor in a unit time, The flow through the flowmeter can be calculated.

For a low-pressure gear flowmeter, an angle encoder can be installed on a gear output shaft of the gear flowmeter, and then the flow rate of the low-pressure flowmeter can be obtained by measuring the gear speed of the flowmeter through the angle encoder. At present, this technology has been Mature, but for high-pressure volumetric flowmeters, the inlet and outlet of the flowmeter are high-pressure oil. If you want to use an angle encoder to measure the gear speed of the flowmeter, you must use it on the gear output shaft of the gear flowmeter. Adding a high-pressure rotary seal will cause a large pressure loss. Therefore, the gear speed of the high-pressure gear flowmeter cannot be measured by an angle encoder, but can only be measured by a non-contact method. For the high-pressure hydraulic system, due to the high system pressure and fast flow rate, a large number of air bubbles will be generated after the measured liquid enters the tank, so the volume method cannot be used for calibration.

The present invention designs a hydraulic system and experimental method for calibrating the K coefficient of the high-pressure volumetric flowmeter based on the weighing method. The invention can complete the calibration of the K coefficient of the volumetric flowmeter under different pressures. The actual pressure of the system is used to determine the K coefficient of the flowmeter. The purpose of doing this is to improve the accuracy of the flowmeter. At the same time, the measurement method also provides a calculation method for the K coefficient of the volumetric high-pressure flowmeter under full pressure; the present invention It is also possible to calibrate the K coefficient of the positive displacement flowmeter under different fluid media according to the difference in viscosity of the fluid media.

The technical scheme that the present invention solves its technical problem adopts is:

The hydraulic system is composed of a volumetric high-pressure flowmeter calibration hydraulic system based on the weighing method. The hydraulic system is composed of a pump source assembly (101) and a weighing method flowmeter calibration system assembly (102); the pump source assembly (101) is closed by a three-way Valve 1 (18), plug 1 (63), oil tank assembly (206), high-pressure plunger variable pump (2), filter 1 (24), high-pressure pipe filter assembly 1 (202), safety valve 1 ( 6), consisting of a pipe check valve 1 (16), a mechanical pressure gauge (34), a three-way stop valve 1 (18), and a digital display pressure sensor 1 (29), of which the high pressure pipe filter assembly 1 (202) It consists of check valve 1 (50), filter 1 (51), differential pressure switch 1 (52), power supply 1 (53), indicator light 1 (54), and the fuel tank assembly (206) consists of fuel tank (1), air Filter (28), liquid temperature and level gauge (35), hydraulic transmission medium (65); weighing method flowmeter calibration system (102) consists of hose 1 (37), hose 2 (38), flowmeter 1 (11), speed sensor 1 (43), data line 1 (59), data acquisition card 1 (60), data line 2 (61), computer 1 (62), digital display pressure sensor 2 (33), direct Dynamic overflow valve (9), weighing oil tank (22), electronic scale (23), three-way stop valve 2 (19), pipe check valve 2 (17), gear pump (3), high-pressure pipe filter The filter assembly 2 (201) and the fuel tank assembly (206); the high-pressure pipe filter assembly 2 (201) consists of a check valve 2 (45), a filter 2 (46), a differential pressure switch 2 (47), a power supply 2 (49), indicator lamp 2 (48) form.

By adjusting the opening pressure of the direct-acting relief valve (9), the calibration of the K coefficient of the flowmeter under different pressures is completed; by adjusting the displacement of the high-pressure plunger variable pump (2), the K coefficient of the flowmeter under different flow rates is completed. Coefficient calibration; by changing the medium of the hydraulic system, the K coefficient calibration of flowmeters with different viscosities can be completed.

Compared with the background technology, the present invention has the beneficial effects of:

The hydraulic system and the experimental method of the invention can complete the calibration of K coefficients of the flowmeters with different pressures, different flow rates and different viscosities. Volumetric manufacturers can use this hydraulic system and experimental methods to give the flowmeter K coefficient calibration values of different pressures, different flows, and different viscosities for each flowmeter shipped from the factory. Users can determine the flowmeter according to their actual hydraulic system. The K factor, which can improve the accuracy of the flowmeter.

The hydraulic transmission medium (65) of the hydraulic system and the experimental method can be hydraulic oil, diesel oil, emulsion and water with different viscosity coefficients; the hydraulic system and the experimental method can also automatically realize the hydraulic transmission medium (65) of the hydraulic system. Circulation filtration; the invention provides a design basis for the calibration of the K coefficient of the high-pressure positive displacement flowmeter.

Description of drawings

The present invention will be further described below in conjunction with accompanying drawings and examples.

Fig. 1 is a hydraulic schematic diagram of the pump source assembly (101) of the present invention.

Figure 2 is a hydraulic schematic diagram of the gravimetric flowmeter calibration system assembly (102) of the present invention.

In Fig. 1 and Fig. 2, 1. oil tank, 2. high-pressure plunger variable pump, 3. gear pump, 9. direct-acting relief valve, 11. flow meter 1, 16. pipe check valve 1, 17. Pipe check valve 2, 18. Three-way stop valve 1, 19. Three-way stop valve 2, 22. Weighing oil tank, 23. Electronic scale, 24. Filter 1, 6. Safety valve 1, 28. Air filter Device, 29. Digital display pressure sensor 1, 33. Digital display pressure sensor 2, 34. Mechanical pressure gauge, 35. Liquid temperature and level gauge, 37. Hose 1, 38. Hose 2, 43. Speed sensor 1, 45. Check valve 2, 46. Filter 2, 47. Differential pressure switch 2, 48. Indicator light 2, 49. Power supply 2, 50. Check valve 1, 51. Filter 1, 52. Differential pressure switch 1 , 53. Power supply 1, 54. Indicator light 1, 59. Data line 1, 60. Data acquisition card 1, 61. Data line 2, 62. Computer 1, 63. Plug 1, 65. Hydraulic transmission medium, 101. Pump source component, 102. Gravimetric flowmeter calibration system component, 201. High pressure tube filter component 2, 202. High pressure tube filter component 1, 206. Fuel tank component,

detailed description

As shown in Figures 1 and 2, a volumetric high-pressure flowmeter calibration hydraulic system based on the weighing method is composed of a pump source assembly (101) and a weighing method flowmeter calibration system assembly (102); the pump source The assembly (101) consists of a three-way stop valve 1 (18), a plug 1 (63), an oil tank assembly (206), a high-pressure plunger variable pump (2), a filter 1 (24), and a high-pressure pipe filter assembly 1 (202), a safety valve 1 (6), a pipe check valve 1 (16), a mechanical pressure gauge (34), a three-way stop valve 1 (18), and a digital display pressure sensor 1 (29). Type filter assembly 1 (202) is made up of one-way valve 1 (50), filter 1 (51), differential pressure switch 1 (52), power supply 1 (53), indicator light 1 (54), fuel tank assembly (206 ) consists of a fuel tank (1), an air filter (28), a liquid temperature gauge (35), and a hydraulic transmission medium (65); the gravimetric flowmeter calibration system (102) consists of a hose 1 (37), soft Pipe 2 (38), flow meter 1 (11), speed sensor 1 (43), data line 1 (59), data acquisition card 1 (60), data line 2 (61), computer 1 (62), digital display Pressure sensor 2 (33), direct-acting relief valve (9), weighing oil tank (22), electronic scale (23), three-way stop valve 2 (19), pipe check valve 2 (17), gear pump (3), high-pressure tubular filter assembly 2 (201), fuel tank assembly (206); high-pressure tubular filter assembly 2 (201) consists of check valve 2 (45), filter 2 (46), pressure Composed of switch 2 (47), power supply 2 (49), and indicator light 2 (48);

The port a of the filter 1 (24) is connected with the oil tank assembly (206), the port b of the filter 1 (24) is connected with the port a of the high-pressure plunger variable pump (2); the high-pressure plunger variable pump (2) The b port of the high pressure tubular filter 1 (202) is connected with the a port of the high pressure tubular filter 1 (202); the b port of the high pressure tubular filter 1 (202) is respectively connected with the a port of the tubular check valve 1 (16), the mechanical pressure gauge ( 34) port a and the P port of the safety valve 1 (6) are connected; the T port of the safety valve 1 (6) is connected with the oil tank assembly (206); the b port of the pipe check valve 1 (16) is respectively connected with The a port of the digital display pressure sensor 1 (29) is connected with the a port of the three-way stop valve 1 (18); the b port of the three-way stop valve 1 (18) is connected with the b port of the hose 1 (37); Port a of hose 1 (37) is connected to port b of flow meter 1 (11); port a of flow meter 1 (11) is connected to port b of hose 2 (38), and hose 2 (38) port a of the direct-acting relief valve (9) and port a of the digital display pressure sensor 2 (33) are respectively connected; port T of the direct-acting relief valve (9) is connected to the The b port is connected; the a port of the weighing oil tank (22) is connected with the a port of the three-way stop valve 2 (19); the c port of the three-way stop valve 2 (19) is connected with the fuel tank assembly (206), the pipe type single Port a of valve 2 (17) is connected; port b of three-way stop valve 2 (19) is respectively connected with port a of gear pump (3) and port b of pipe check valve 2 (17); Port b of the pump (3) communicates with port a of the high-pressure tubular filter 2 (201); port b of the high-pressure tubular filter 2 (201) communicates with the fuel tank assembly (206); the air filter (28) Installed on the oil tank (1); the liquid temperature level meter (35) is installed on the inner wall of the oil tank (1); the weighing oil tank (22) is placed on the weighing surface of the electronic scale (23); installed on the flow meter 1 The rotational speed sensor 1 (43) on (11) connects the rotational speed signal to computer 1 (62) by data line 1 (59), high-speed data acquisition card 1 (60), data line 2 (61); 1(18) When the handle is at position B, the a oil circuit and c oil circuit of the three-way stop valve 1(18) are connected; the c oil circuit of the three-way stop valve 1(18) is blocked by the plug 1(63) , as a backup hydraulic source for other hydraulic test systems; when the handle of the three-way stop valve 1 (18) is at position A, the a and b oil circuits of the three-way stop valve 1 (18) are connected; When the handle of valve 2 (19) is at position A, the a oil circuit and b oil circuit of the three-way stop valve 2 (19) are connected; when the handle of the three-way stop valve 2 (19) is at position B, the three-way cut-off The b oil circuit and c oil circuit of valve 2 (19) are connected; the function of the high-pressure pipe filter assembly 1 (202) is to filter the hydraulic transmission medium (65) passing through its port a to port b, if the filter 1 (51) is blocked, the hydraulic transmission medium (65) will return to the oil tank assembly (206) through the bypass check valve 1 (50), and trigger the differential pressure switch 1 (52) at the same time to indicate The light gives an alarm; if the filter is not blocked, the hydraulic transmission medium (65) enters through port a of the high-pressure tubular filter assembly 2 (201) and flows out from the port b of the high-pressure tubular filter assembly 2 (201). When blockage occurs, the hydraulic transmission medium (65) will pass through the bypass check valve 2 (45), and simultaneously trigger the differential pressure switch 2 (47) so that the indicator light 2 (48) will cause the indicator light to light up for alarm.

The described hydraulic system for calibrating a volumetric high-pressure flowmeter based on weighing method is characterized in that: the hydraulic system includes a self-filtering circulation system of a hydraulic transmission medium (65); (1) the three-way shut-off valve 2 (19 ) handle to position A, start the gear pump (3), the hydraulic transmission medium (65) in the weighing oil tank (22) passes through the three-way stop valve 2 (19), the gear pump (3), the high-pressure pipe filter 2 (201) enters the oil tank assembly (206), and filters the hydraulic transmission medium while returning oil; (2) adjust the handle of the three-way stop valve 2 (19) to position B, and start the gear pump (3), The hydraulic transmission medium (65) is returned to the oil tank assembly (206) from the oil tank assembly (206) through the three-way stop valve 2 (19), the gear pump (3), and the high-pressure pipe filter assembly 2 (201); the self-circulation Filtration system 3 hours, complete the filtration of hydraulic transmission medium (65).

The hydraulic system for calibrating a volumetric high-pressure flowmeter based on weighing method is characterized in that: the hydraulic transmission medium (65) is hydraulic oil, diesel oil, emulsion and water with different viscosity coefficients.

An experimental method for calibrating a volumetric high-pressure flowmeter based on a weighing method. The hydraulic system of the experimental method is composed of a pump source assembly (101) and a gravimetric flowmeter calibration system assembly (102); the pump source assembly (101) It consists of a three-way stop valve 1 (18), a plug 1 (63), an oil tank assembly (206), a high-pressure plunger variable pump (2), a filter 1 (24), a high-pressure pipe filter assembly 1 (202), It consists of a safety valve 1 (6), a tubular check valve 1 (16), a mechanical pressure gauge (34), a three-way stop valve 1 (18), and a digital display pressure sensor 1 (29), among which the high-pressure tubular filter assembly 1 (202) is made up of check valve 1 (50), filter 1 (51), differential pressure switch 1 (52), power supply 1 (53), indicator light 1 (54), and fuel tank assembly (206) is made up of fuel tank ( 1), air filter (28), liquid temperature and level gauge (35), hydraulic transmission medium (65); weighing method flowmeter calibration system (102) consists of hose 1 (37), hose 2 (38 ), flowmeter 1 (11), speed sensor 1 (43), data line 1 (59), data acquisition card 1 (60), data line 2 (61), computer 1 (62), digital display pressure sensor 2 ( 33), direct-acting overflow valve (9), weighing oil tank (22), electronic scale (23), three-way stop valve 2 (19), pipe check valve 2 (17), gear pump (3), High-pressure pipe filter assembly 2 (201) and oil tank assembly (206); high-pressure pipe filter assembly 2 (201) consists of check valve 2 (45), filter 2 (46), pressure differential switch 2 (47 ), power supply 2 (49), indicator light 2 (48) to form;

The port a of the filter 1 (24) is connected with the oil tank assembly (206), the port b of the filter 1 (24) is connected with the port a of the high-pressure plunger variable pump (2); the high-pressure plunger variable pump (2) The b port of the high pressure tubular filter 1 (202) is connected with the a port of the high pressure tubular filter 1 (202); the b port of the high pressure tubular filter 1 (202) is respectively connected with the a port of the tubular check valve 1 (16), the mechanical pressure gauge ( 34) port a and the P port of the safety valve 1 (6) are connected; the T port of the safety valve 1 (6) is connected with the oil tank assembly (206); the b port of the pipe check valve 1 (16) is respectively connected with The a port of the digital display pressure sensor 1 (29) is connected with the a port of the three-way stop valve 1 (18); the b port of the three-way stop valve 1 (18) is connected with the b port of the hose 1 (37); Port a of hose 1 (37) is connected to port b of flow meter 1 (11); port a of flow meter 1 (11) is connected to port b of hose 2 (38), and hose 2 (38) port a of the direct-acting relief valve (9) and port a of the digital display pressure sensor 2 (33) are respectively connected; port T of the direct-acting relief valve (9) is connected to the The b port is connected; the a port of the weighing oil tank (22) is connected with the a port of the three-way stop valve 2 (19); the c port of the three-way stop valve 2 (19) is connected with the fuel tank assembly (206), the pipe type single Port a of valve 2 (17) is connected; port b of three-way stop valve 2 (19) is respectively connected with port a of gear pump (3) and port b of pipe check valve 2 (17); Port b of the pump (3) communicates with port a of the high-pressure tubular filter 2 (201); port b of the high-pressure tubular filter 2 (201) communicates with the fuel tank assembly (206); the air filter (28) Installed on the oil tank (1); the liquid temperature level meter (35) is installed on the inner wall of the oil tank (1); the weighing oil tank (22) is placed on the weighing surface of the electronic scale (23); installed on the flow meter 1 The rotational speed sensor 1 (43) on (11) connects the rotational speed signal to computer 1 (62) by data line 1 (59), high-speed data acquisition card 1 (60), data line 2 (61); 1(18) When the handle is at position B, the a oil circuit and c oil circuit of the three-way stop valve 1(18) are connected; the c oil circuit of the three-way stop valve 1(18) is blocked by the plug 1(63) , as a backup hydraulic source for other hydraulic test systems; when the handle of the three-way stop valve 1 (18) is at position A, the a and b oil circuits of the three-way stop valve 1 (18) are connected; When the handle of valve 2 (19) is at position A, the a oil circuit and b oil circuit of the three-way stop valve 2 (19) are connected; when the handle of the three-way stop valve 2 (19) is at position B, the three-way cut-off The b oil circuit and c oil circuit of valve 2 (19) are connected; the function of the high-pressure pipe filter assembly 1 (202) is to filter the hydraulic transmission medium (65) passing through its port a to port b, if the filter 1 (51) is blocked, the hydraulic transmission medium (65) will return to the oil tank assembly (206) through the bypass check valve 1 (50), and trigger the differential pressure switch 1 (52) at the same time to indicate The light gives an alarm; if the filter is not blocked, the hydraulic transmission medium (65) enters through port a of the high-pressure tubular filter assembly 2 (201) and flows out from the port b of the high-pressure tubular filter assembly 2 (201). When blockage occurs, the hydraulic transmission medium (65) will pass through the bypass check valve 2 (45), and simultaneously trigger the differential pressure switch 2 (47) so that the indicator light 2 (48) will cause the indicator light to emit light and give an alarm;

By recording the weight and time of the hydraulic transmission medium (65) entering the weighing oil tank (22), the weight flowing through the flow meter 1 (11) per unit time can be calculated; the meter coefficient of the flow meter is called the K coefficient, and the flow meter 1 (11) The relationship with K coefficient is: K=N/Q, when the hydraulic transmission medium (65) passes through the flow meter 1 (11), it drives the gear in the flow meter 1 (11) to rotate, and passes through the The rotational speed sensor 1 (43) on 1 (11) obtains the metering pulse number N per unit time; Q is the flow rate passing through the flow meter 1 (11) per unit time. ) to adjust the cracking pressure P _i of the direct-acting relief valve (9), where P _i is: 0, 4, 8, 12, 16, 20, 24, 28, 31.5 (MPa). Calibration of P _i and K coefficient of specific flow Q _j ; set a flow value Q _j of the high-pressure plunger variable pump (2), where Q _j can be adjusted to 10, 20, 30, 40, 50 (L/min) , record the initial weight G ₁ (kg) of the oil in the weighing oil tank (22) on the electronic scale (23), start the experiment, record the time t and the electronic scale ( 23) The displayed weight G ₂ (kg), obtain the weight ΔG of the hydraulic transmission medium (65) flowing through the flowmeter 1 (11) within t time, ΔG=G ₂ -G ₁ (kg), when the hydraulic transmission medium ( When the density of 65) is ρ(kg/L), the volume ΔV passing through the flowmeter 1 (11) within t time is: ΔV=ΔG/ρ(L), and the flow Q passing through the flowmeter is: Q=ΔV /t(L/min)=ΔG/(ρ*t); thus the K coefficient under a given pressure and a given flow rate is obtained: K=N/Q=N*ρ*t/ΔG, the specific experimental method is as follows:

K _ijz , the subscript i indicates that the flowmeter 1 (11) is calibrated at the pressure P _i , the subscript j indicates that the flowmeter 1 (11) is calibrated at the flow rate Q _j , the subscript z indicates the number of repeated tests, z=1 ~3; first keep the pressure P _i and flow Q _j constant, repeat the test three times, and take the average value, The instrument coefficient K _ij under the condition of pressure P _i and flow Q _j is obtained; similarly, when the system pressure P _i is constant, the flow calibration test under different flow Q _j is done, and the flow rate under different flow is obtained Five meter coefficients K _i1 , K _i2 , K _i3 , K _i4 , K _i5 , and take their average value as Get K _i coefficients under the same pressure and different flow rates; then repeat the above experimental steps to get K coefficients K ₁ , K ₂ , K ₃ , K ₄ , K ₅ , K ₆ , K ₇ under nine different pressure conditions, K ₈ , K ₉ , K _imax ＝max(K _i ), i=1～9, K _imin ＝min(K _i ), i＝1～9, and then get the instrument factor K of flowmeter 1 (11):

A kind of experimental method of the volumetric high-pressure flowmeter calibration based on the weighing method is characterized in that: the experimental method includes a self-filtering circulation system of the hydraulic transmission medium (65); (1) the three-way shut-off valve 2 ( 19) Adjust the handle to position A, start the gear pump (3), the hydraulic transmission medium (65) in the weighing oil tank (22) passes through the three-way stop valve 2 (19), the gear pump (3), and the high-pressure pipe filter The device 2 (201) enters the oil tank assembly (206), and filters the hydraulic transmission medium while returning the oil; (2) Adjust the handle of the three-way stop valve 2 (19) to position B, and start the gear pump (3) , the hydraulic transmission medium (65) returns to the oil tank assembly (206) again from the oil tank assembly (206) through the three-way stop valve 2 (19), the gear pump (3), and the high-pressure pipe filter assembly 2 (201); Circulate the filtration system for 3 hours to complete the filtration of the hydraulic transmission medium (65).

The experimental method for calibrating a volumetric high-pressure flowmeter based on the weighing method is characterized in that: the hydraulic transmission medium (65) of the experimental method is hydraulic oil, diesel oil, emulsion and water with different viscosity coefficients.

The described experimental method of volumetric high-pressure flowmeter calibration based on the weighing method is characterized in that: according to the difference of the medium of the hydraulic transmission medium (65), the experimental method can complete different medium viscosity flowmeters 1 (11) K-factor calibration experiment.

The basic principles, main features and advantages of the present invention have been shown and described above. Those skilled in the industry should understand that the present invention is not limited by the above-mentioned embodiments. What are described in the above-mentioned embodiments and the description only illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will also have Variations and improvements are possible, which fall within the scope of the claimed invention. The protection scope of the present invention is defined by the appended claims and their equivalents.

Claims (7)

1. A volumetric high-pressure flowmeter calibration hydraulic system based on weighing method, the hydraulic system is composed of a pump source assembly (101), weighing method flowmeter by a kind of volumetric high-pressure flowmeter calibration hydraulic system based on weighing method The calibration system assembly (102) is composed; the pump source assembly (101) consists of a three-way stop valve 1 (18), a plug 1 (63), an oil tank assembly (206), a high-pressure plunger variable pump (2), a filter 1 ( 24), high-pressure pipe filter assembly 1 (202), safety valve 1 (6), pipe check valve 1 (16), mechanical pressure gauge (34), three-way stop valve 1 (18), digital display pressure The sensor 1 (29) is composed of a high-pressure pipe filter assembly 1 (202), which consists of a one-way valve 1 (50), a filter 1 (51), a differential pressure switch 1 (52), a power supply 1 (53), an indicator light 1 (54), the fuel tank assembly (206) is composed of a fuel tank (1), an air filter (28), a liquid temperature and level gauge (35), and a hydraulic transmission medium (65); the weighing method flowmeter calibration system (102 ) consists of hose 1 (37), hose 2 (38), flow meter 1 (11), speed sensor 1 (43), data line 1 (59), data acquisition card 1 (60), data line 2 (61 ), computer 1 (62), digital display pressure sensor 2 (33), direct relief valve (9), weighing oil tank (22), electronic scale (23), three-way stop valve 2 (19), pipe type Check valve 2 (17), gear pump (3), high-pressure pipe filter assembly 2 (201), fuel tank assembly (206); high-pressure pipe filter assembly 2 (201) consists of check valve 2 (45) , filter 2 (46), differential pressure switch 2 (47), power supply 2 (49), indicator light 2 (48); The port a of the filter 1 (24) is connected with the oil tank assembly (206), the port b of the filter 1 (24) is connected with the port a of the high-pressure plunger variable pump (2); the high-pressure plunger variable pump (2) The b port of the high pressure tubular filter 1 (202) is connected with the a port of the high pressure tubular filter 1 (202); the b port of the high pressure tubular filter 1 (202) is respectively connected with the a port of the tubular check valve 1 (16), the mechanical pressure gauge ( 34) port a and the P port of the safety valve 1 (6) are connected; the T port of the safety valve 1 (6) is connected with the oil tank assembly (206); the b port of the pipe check valve 1 (16) is respectively connected with The a port of the digital display pressure sensor 1 (29) is connected with the a port of the three-way stop valve 1 (18); the b port of the three-way stop valve 1 (18) is connected with the b port of the hose 1 (37); Port a of hose 1 (37) is connected to port b of flow meter 1 (11); port a of flow meter 1 (11) is connected to port b of hose 2 (38), and hose 2 (38) port a of the direct-acting relief valve (9) and port a of the digital display pressure sensor 2 (33) are respectively connected; port T of the direct-acting relief valve (9) is connected to the The b port is connected; the a port of the weighing oil tank (22) is connected with the a port of the three-way stop valve 2 (19); the c port of the three-way stop valve 2 (19) is connected with the fuel tank assembly (206), the pipe type single Port a of valve 2 (17) is connected; port b of three-way stop valve 2 (19) is respectively connected with port a of gear pump (3) and port b of pipe check valve 2 (17); Port b of the pump (3) communicates with port a of the high-pressure tubular filter 2 (201); port b of the high-pressure tubular filter 2 (201) communicates with the fuel tank assembly (206); the air filter (28) Installed on the oil tank (1); the liquid temperature level meter (35) is installed on the inner wall of the oil tank (1); the weighing oil tank (22) is placed on the weighing surface of the electronic scale (23); installed on the flow meter 1 The rotational speed sensor 1 (43) on (11) connects the rotational speed signal to computer 1 (62) by data line 1 (59), high-speed data acquisition card 1 (60), data line 2 (61); 1(18) When the handle is at position B, the a oil circuit and c oil circuit of the three-way stop valve 1(18) are connected; the c oil circuit of the three-way stop valve 1(18) is blocked by the plug 1(63) , as a backup hydraulic source for other hydraulic test systems; when the handle of the three-way stop valve 1 (18) is at position A, the a and b oil circuits of the three-way stop valve 1 (18) are connected; When the handle of valve 2 (19) is at position A, the a oil circuit and b oil circuit of the three-way stop valve 2 (19) are connected; when the handle of the three-way stop valve 2 (19) is at position B, the three-way cut-off The b oil circuit and c oil circuit of valve 2 (19) are connected; the function of the high-pressure pipe filter assembly 1 (202) is to filter the hydraulic transmission medium (65) passing through its port a to port b, if the filter 1 (51) is blocked, the hydraulic transmission medium (65) will return to the oil tank assembly (206) through the bypass check valve 1 (50), and trigger the differential pressure switch 1 (52) at the same time to indicate The light gives an alarm; if the filter is not blocked, the hydraulic transmission medium (65) enters through port a of the high-pressure tubular filter assembly 2 (201) and flows out from the port b of the high-pressure tubular filter assembly 2 (201). Blockage occurs, the hydraulic transmission medium (65) will pass through the bypass check valve 2 (45), and simultaneously trigger the differential pressure switch 2 (47) so that the indicator light 2 (48) makes the indicator light emit light and alarm; the direct-acting overflow valve ( 9) The opening pressure is 0-31.5MPa. 2. a kind of volumetric high-pressure flowmeter calibration hydraulic system based on weighing method according to claim 1, is characterized in that: this hydraulic system comprises the self-filtering circulation system of hydraulic transmission medium (65); (1) three Turn the handle of the stop valve 2 (19) to position A, start the gear pump (3), and the hydraulic transmission medium (65) in the weighing oil tank (22) passes through the three-way stop valve 2 (19), the gear pump (3) 1. The high-pressure pipe filter 2 (201) enters the oil tank assembly (206), and filters the hydraulic transmission medium while returning oil; (2) adjust the handle of the three-way stop valve 2 (19) to position B, and start The gear pump (3), the hydraulic transmission medium (65) returns to the fuel tank assembly ( 206); open the self-circulation filter system for 3 hours, and complete the filtration of the hydraulic transmission medium (65). 3. A hydraulic system for calibrating a volumetric high-pressure flowmeter based on weighing method according to claim 1, characterized in that: the hydraulic transmission medium (65) is hydraulic oil, diesel oil, emulsion and water with different viscosity coefficients. 4. an experimental method based on the calibration of a volumetric high-pressure flowmeter of the weighing method, the hydraulic system of the experimental method is made up of a pump source assembly (101), a weighing method flowmeter calibration system assembly (102); the pump source assembly ( 101) consists of three-way stop valve 1 (18), plug 1 (63), oil tank assembly (206), high-pressure plunger variable pump (2), filter 1 (24), high-pressure pipe filter assembly 1 (202 ), a safety valve 1 (6), a pipe check valve 1 (16), a mechanical pressure gauge (34), a three-way stop valve 1 (18), and a digital display pressure sensor 1 (29). The device assembly 1 (202) is composed of a check valve 1 (50), a filter 1 (51), a differential pressure switch 1 (52), a power supply 1 (53), and an indicator light 1 (54). The fuel tank assembly (206) is composed of Oil tank (1), air filter (28), liquid temperature and level gauge (35), hydraulic transmission medium (65); weighing method flowmeter calibration system (102) consists of hose 1 (37), hose 2 (38), flow meter 1 (11), speed sensor 1 (43), data line 1 (59), data acquisition card 1 (60), data line 2 (61), computer 1 (62), digital display pressure sensor 2 (33), direct-acting overflow valve (9), weighing oil tank (22), electronic scale (23), three-way stop valve 2 (19), pipe check valve 2 (17), gear pump (3 ), a high-pressure tubular filter assembly 2 (201), and a fuel tank assembly (206); the high-pressure tubular filter assembly 2 (201) consists of a check valve 2 (45), a filter 2 (46), and a differential pressure switch (47), power supply 2 (49), indicator lamp 2 (48) form; The port a of the filter 1 (24) is connected with the oil tank assembly (206), the port b of the filter 1 (24) is connected with the port a of the high-pressure plunger variable pump (2); the high-pressure plunger variable pump (2) The b port of the high pressure tubular filter 1 (202) is connected with the a port of the high pressure tubular filter 1 (202); the b port of the high pressure tubular filter 1 (202) is respectively connected with the a port of the tubular check valve 1 (16), the mechanical pressure gauge ( 34) port a and the P port of the safety valve 1 (6) are connected; the T port of the safety valve 1 (6) is connected with the oil tank assembly (206); the b port of the pipe check valve 1 (16) is respectively connected with The a port of the digital display pressure sensor 1 (29) is connected with the a port of the three-way stop valve 1 (18); the b port of the three-way stop valve 1 (18) is connected with the b port of the hose 1 (37); Port a of hose 1 (37) is connected to port b of flow meter 1 (11); port a of flow meter 1 (11) is connected to port b of hose 2 (38), and hose 2 (38) port a of the direct-acting relief valve (9) and port a of the digital display pressure sensor 2 (33) are respectively connected; port T of the direct-acting relief valve (9) is connected to the The b port is connected; the a port of the weighing oil tank (22) is connected with the a port of the three-way stop valve 2 (19); the c port of the three-way stop valve 2 (19) is connected with the fuel tank assembly (206), the pipe type single Port a of valve 2 (17) is connected; port b of three-way stop valve 2 (19) is respectively connected with port a of gear pump (3) and port b of pipe check valve 2 (17); Port b of the pump (3) communicates with port a of the high-pressure tubular filter 2 (201); port b of the high-pressure tubular filter 2 (201) communicates with the fuel tank assembly (206); the air filter (28) Installed on the oil tank (1); the liquid temperature level meter (35) is installed on the inner wall of the oil tank (1); the weighing oil tank (22) is placed on the weighing surface of the electronic scale (23); installed on the flow meter 1 The rotational speed sensor 1 (43) on (11) connects the rotational speed signal to computer 1 (62) by data line 1 (59), high-speed data acquisition card 1 (60), data line 2 (61); 1(18) When the handle is at position B, the a oil circuit and c oil circuit of the three-way stop valve 1(18) are connected; the c oil circuit of the three-way stop valve 1(18) is blocked by the plug 1(63) , as a backup hydraulic source for other hydraulic test systems; when the handle of the three-way stop valve 1 (18) is at position A, the a and b oil circuits of the three-way stop valve 1 (18) are connected; When the handle of valve 2 (19) is at position A, the a oil circuit and b oil circuit of the three-way stop valve 2 (19) are connected; when the handle of the three-way stop valve 2 (19) is at position B, the three-way cut-off The b oil circuit and c oil circuit of valve 2 (19) are connected; the function of the high-pressure pipe filter assembly 1 (202) is to filter the hydraulic transmission medium (65) passing through its port a to port b, if the filter 1 (51) is blocked, the hydraulic transmission medium (65) will return to the oil tank assembly (206) through the bypass check valve 1 (50), and trigger the differential pressure switch 1 (52) at the same time to indicate The light gives an alarm; if the filter is not blocked, the hydraulic transmission medium (65) enters through port a of the high-pressure tubular filter assembly 2 (201) and flows out from the port b of the high-pressure tubular filter assembly 2 (201). When blockage occurs, the hydraulic transmission medium (65) will pass through the bypass check valve 2 (45), and simultaneously trigger the differential pressure switch 2 (47) so that the indicator light 2 (48) will cause the indicator light to emit light and give an alarm; By recording the weight and time of the hydraulic transmission medium (65) entering the weighing oil tank (22), the weight flowing through the flow meter 1 (11) per unit time can be calculated; the meter coefficient of the flow meter is called the K coefficient, and the flow meter 1 (11) The relationship with K coefficient is: K=N/Q, when the hydraulic transmission medium (65) passes through the flow meter 1 (11), it drives the gear in the flow meter 1 (11) to rotate, and passes through the The rotational speed sensor 1 (43) on 1 (11) obtains the metering pulse number N per unit time; Q is the flow rate passing through the flow meter 1 (11) per unit time. ) to adjust the cracking pressure P _i of the direct-acting relief valve (9), where P _i is: 0, 4, 8, 12, 16, 20, 24, 28, 31.5 (MPa). Calibration of P _i and K coefficient of specific flow Q _j ; set a flow value Q _j of the high-pressure plunger variable pump (2), where Q _j can be adjusted to 10, 20, 30, 40, 50 (L/min) , record the initial weight G ₁ (kg) of the oil in the weighing oil tank (22) on the electronic scale (23), start the experiment, record the time t and the electronic scale ( 23) The displayed weight G ₂ (kg), obtain the weight ΔG of the hydraulic transmission medium (65) flowing through the flowmeter 1 (11) within t time, ΔG=G ₂ -G ₁ (kg), when the hydraulic transmission medium ( When the density of 65) is ρ(kg/L), the volume ΔV passing through the flowmeter 1 (11) within t time is: ΔV=ΔG/ρ(L), and the flow Q passing through the flowmeter is: Q=ΔV /t(L/min)=ΔG/(ρ*t); thus the K coefficient under a given pressure and a given flow rate is obtained: K=N/Q=N*ρ*t/ΔG, the specific experimental method is as follows: K _ijz , the subscript i indicates that the flowmeter 1 (11) is calibrated at the pressure P _i , the subscript j indicates that the flowmeter 1 (11) is calibrated at the flow rate Q _j , the subscript z indicates the number of repeated tests, z=1 ~3; first keep the pressure P _i and flow Q _j constant, repeat the test three times, and take the average value, The instrument coefficient K _ij under the condition of pressure P _i and flow Q _j is obtained; similarly, when the system pressure P _i is constant, the flow calibration test under different flow Q _j is done, and the flow rate under different flow is obtained Five meter coefficients K _i1 , K _i2 , K _i3 , K _i4 , K _i5 , and take their average value as Get K _i coefficients under the same pressure and different flow rates; then repeat the above experimental steps to get K coefficients K ₁ , K ₂ , K ₃ , K ₄ , K ₅ , K ₆ , K ₇ under nine different pressure conditions, K ₈ , K ₉ , K _imax ＝max(K _i ), i=1～9, K _imin ＝min(K _i ), i＝1～9, and then get the instrument factor K of flowmeter 1 (11): 5. the experimental method of a kind of volumetric high-pressure flowmeter calibration based on weighing method according to claim 4, is characterized in that: this experimental method comprises the self-filtering circulation system of hydraulic transmission medium (65); (1) will The handle of the three-way stop valve 2 (19) is adjusted to position A, the gear pump (3) is started, and the hydraulic transmission medium (65) in the weighing oil tank (22) passes through the three-way stop valve 2 (19), the gear pump (3 ), the high-pressure pipe filter 2 (201) enters the oil tank assembly (206), and filters the hydraulic transmission medium while returning oil; (2) adjust the handle of the three-way stop valve 2 (19) to position B, Start the gear pump (3), and the hydraulic transmission medium (65) returns to the fuel tank assembly (206) through the three-way stop valve 2 (19), the gear pump (3), and the high-pressure pipe filter assembly 2 (201) from the fuel tank assembly (206) (206); Open the self-circulation filter system for 3 hours to complete the filtration of the hydraulic transmission medium (65). 6. the experimental method of a kind of volumetric high-pressure flowmeter calibration based on weighing method according to claim 4, is characterized in that: the hydraulic transmission medium (65) of this experimental method is the hydraulic oil that viscosity coefficient is different, diesel oil, emulsion and water. 7. the experimental method of a kind of volumetric high-pressure flowmeter calibration based on weighing method according to claim 4, is characterized in that: according to the difference of the medium of hydraulic transmission medium (65), this experimental method can complete different medium viscosity K-Factor Calibration Experiment for Flow Meter 1(11).