Loop device for calibration of high-pressure gas flowmeter and working method of loop device

Abstract

The invention discloses a loop device for high-pressure gas flowmeter calibration and a working method thereof.The loop device comprises a piston type compressor, a circulating box, a first collecting pipe, a second collecting pipe and a third collecting pipe, and the input end of the piston type compressor is fixedly provided with a first surge tank through a pipeline; a cooling box is fixedly installed at the output end of the piston type compressor through a pipeline, and a water pump is fixedly installed at the lower end of the front surface of the circulating box through a pipeline. High-pressure gas can be driven in the detection and calibration process of the high-pressure gas flow meter by adopting the piston type compressor, and due to the fact that a piston ring in the piston type compressor can effectively seal a piston and a cylinder body in the operation process, gas leakage is avoided; compared with a traditional mode that air is compressed through a blade type axial flow compressor, the piston type compressor has the advantages that the gas compression efficiency is greatly improved, and then energy consumption generated in the whole operation process is effectively reduced.

Description

Technical Field

[0001] The invention relates to the technical field of high-pressure gas flowmeter calibration, in particular to a high-pressure gas flowmeter calibration loop device and a working method thereof. Background Art

[0002] A high-pressure gas flow meter is an instrument specially designed to measure the flow of high-pressure gases. Its working principle is based on fluid dynamics and sensing technology. It can accurately detect and record the flow and total amount of gas. Under high-pressure conditions, the high-pressure gas flow meter can still maintain stability and accuracy. A ring device is usually used in the calibration process of the high-pressure gas flow meter. The ring device simulates the gas flow under actual working conditions and can provide a pressure-stable and controllable flow environment, thereby ensuring the accuracy and reliability of the flow meter calibration.

[0003] The annular devices currently used mostly use vane axial compressors to drive the high-pressure gas required for the calibration of high-pressure gas flow meters. Since there are gaps between the blades of the vane axial compressor during operation and leakage occurs, the efficiency of the air compression operation is affected. As a result, the vane axial compressor often needs to operate at a higher power and generate more heat during use. At the same time, since the blades will generate friction with the compressed air during rotation, the temperature of the compressed air will increase. Therefore, in order to ensure the accuracy of the subsequent high-pressure gas flow meter calibration, it is often necessary to add a complex refrigeration system to the annular device, which greatly increases the overall manufacturing and use costs. Summary of the invention

[0004] The object of the present invention is to provide a ring device for calibrating a high-pressure gas flowmeter and a working method thereof, which has the advantages of high air compression efficiency, reduced energy consumption and heat generation, and can control the temperature of the compressed air within a standard range by a single water cooling method, thereby effectively reducing the overall manufacturing and use costs.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a high-pressure gas flow meter calibration loop device, comprising a piston compressor, a circulation box, a first manifold, a second manifold and a third manifold, the input end of the piston compressor is fixedly mounted with a first pressure-stabilizing tank via a pipeline, the output end of the piston compressor is fixedly mounted with a cooling box via a pipeline, the lower end of the front surface of the circulation box is fixedly mounted with a water pump via a pipeline, the output end of the water pump is fixedly mounted with a plate heat exchanger via a pipeline and an inner cavity of the cooling box, the top of the plate heat exchanger is fixedly mounted with a radiator via a pipeline and a top of the outer surface of the circulation box, the back of the radiator is fixedly mounted to the back of the circulation box via a pipeline, and the left side of the cooling box is fixedly mounted with a plate heat exchanger via a pipeline. A first switch valve is fixedly installed through a pipeline, a second pressure-stabilizing tank is fixedly installed on the left side of the first switch valve through a pipeline, a second switch valve, an oil removal dryer, an air storage tank, a sixth switch valve, a blower and a filter box are fixedly installed on the left side of the second pressure-stabilizing tank from right to left through a pipeline, a third switch valve is fixedly installed between the front surface of the second pressure-stabilizing tank and the left side of the first manifold through a pipeline, a seventh switch valve, a standard flow meter and a first regulating valve are fixedly installed between the right side of the first manifold and the left side of the second manifold from left to right through a pipeline, and a fifth switch valve, a flow meter to be inspected and a second regulating valve are fixedly installed between the right side of the second manifold and the left side of the third manifold from left to right through a pipeline.

[0006] As a preferred solution, a baffle is fixedly connected to the upper end of the inner cavity of the filter box, a second motor is fixedly installed on the left end of the top of the baffle, a first bevel gear is fixedly installed on the output end of the second motor, an air guide cylinder is movably connected to the middle end of the baffle through a bearing, a second bevel gear is fixedly installed on the upper end of the air guide cylinder, the second bevel gear is meshed with the first bevel gear, a filter mesh cylinder is fixedly installed on the bottom of the air guide cylinder, and a fixing frame is fixedly connected to the lower end of the right side of the inner cavity of the filter box.

[0007] As a preferred solution, a support spring is fixedly connected to the middle end of the left side of the fixed frame, a cleaning scraper is fixedly connected to the left side of the support spring, the surface of the cleaning scraper is movably connected to the surface of the filter cylinder, and both ends of the right side of the cleaning scraper are fixedly connected to guide slide rods, and the surface of the guide slide rod is movably connected to the left side of the fixed frame.

[0008] As a preferred solution, the lower end of the left side of the filter box is fixedly connected with an air inlet pipe, and the lower end of the front surface of the filter box is movably connected with a maintenance door via a hinge.

[0009] As a preferred solution, a partition is fixedly connected to the upper end of the inner cavity of the circulation box, a first motor is fixedly installed at the middle end of the top of the partition, a first pulley is fixedly installed at the output end of the first motor, both ends of the partition are movably connected to a cooling fan through bearings, a second pulley is fixedly installed at the bottom of the cooling fan, and a belt is transmission-connected between the surface of the second pulley and the surface of the first pulley.

[0010] As a preferred solution, air guide holes are provided around the upper end of the circulation box, and the air guide holes are rectangular in shape.

[0011] As a preferred solution, pressure monitoring gauges are fixedly installed on the top of the first pressure-stabilizing tank and the top of the second pressure-stabilizing tank, respectively.

[0012] As a preferred solution, a fourth switch valve is fixedly installed between the right side of the first pressure-stabilizing tank and the right side of the third manifold via a pipeline.

[0013] As a preferred solution, the bottoms of the first manifold, the second manifold and the third manifold are respectively fixedly connected with bearing brackets.

[0014] A working method of a loop device for calibrating a high-pressure gas flowmeter, the working method comprising the following steps:

[0015] A. First, after the flowmeter to be tested and calibrated is installed between the fifth switch valve and the second regulating valve, the blower can be started to extract the filtered air inside the filter box, and then the air is transported to the second pressure stabilizing tank, the first manifold, the second manifold, the third manifold, the first pressure stabilizing tank and the cooling box through the sixth switch valve, the air storage tank, the second switch valve and the oil removal dryer;

[0016] B. When the delivered air pressure meets the requirements of the detection and calibration operation, the second switch valve is controlled to close and the piston compressor is started to work so that the air in the first pressure stabilizing tank can be extracted and compressed, and the compressed air flow can be delivered to the interior of the cooling box;

[0017] C. The cooling water in the circulation box can be extracted by the water pump, and transported to the inside of the plate heat exchanger through the pipeline. At the same time, the cooling water can flow back to the inside of the circulation box through the radiator and the pipeline, thereby realizing the circulation of the cooling water. When the cooling water flows through the plate heat exchanger, it can effectively exchange heat with the compressed air flowing through the cooling box, so that the temperature of the compressed air can be cooled to the range required for the detection and calibration operation under the action of heat exchange;

[0018] D. Subsequently, the high-pressure air after cooling inside the cooling box can be transported to the inside of the flow meter to be tested installed between the fifth switch valve and the second regulating valve in sequence through the first switch valve, the second pressure-stabilizing tank, the third switch valve, the first manifold, the seventh switch valve, the standard flow meter, the first regulating valve and the second manifold, so that the standard flow meter and the flow meter to be tested can monitor the flow rate of the high-pressure air passing through the inside, and the personnel can calibrate the flow meter to be tested according to the data monitored by the standard flow meter.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The present invention can drive high-pressure gas during the detection and calibration of the high-pressure gas flowmeter by adopting a piston compressor. Since the piston ring inside the piston compressor can effectively seal the piston and the cylinder body during operation to avoid gas leakage, compared with the traditional method of using a vane axial flow compressor to compress air, the piston compressor has greatly improved the gas compression efficiency, thereby effectively reducing the overall energy consumption generated during operation, and at the same time reducing the heat generated during the overall operation. Therefore, during the overall operation, the temperature of the compressed air can be cooled to the range required for the detection and calibration operation by a single water cooling method. Moreover, since the first pressure stabilizing tank and the second pressure stabilizing tank are respectively installed on one side of the input end and the output end of the piston compressor, the piston compressor effectively avoids the compressed air from forming a pulsating flow state during operation, and at the same time, the gas in the second pressure stabilizing tank is in a relatively static state, which is conducive to the heat of the compressed air being dissipated into the environment.

[0021] 2. The present invention can effectively filter and intercept dust in the air flowing through the filter box through the arrangement of the baffle, the air guide cylinder and the filter screen cylinder, effectively improving the cleanliness of the air delivered by the blower, and through the arrangement of the second motor, the first bevel gear, the second bevel gear and the cleaning scraper, under the action of the second motor, the air guide cylinder and the filter screen cylinder can be driven to rotate through the first bevel gear and the second bevel gear, so that the cleaning scraper can scrape and clean the dust and impurities attached to the surface during the rotation of the filter screen cylinder, effectively avoiding the filter screen cylinder from being blocked and affecting the air circulation, while reducing the frequency of maintenance and replacement, through the arrangement of the fixing frame, the supporting spring and the guide sliding rod, the right side of the cleaning scraper can be elastically supported and guided, avoiding the cleaning scraper from tilting due to the force, and enabling the cleaning scraper to maintain contact with the filter screen cylinder, the lower end of the left side of the filter box is fixedly connected to the air inlet pipe, and the lower end of the front surface of the filter box is movably connected to the maintenance door through a hinge.

[0022] 3. The present invention arranges a partition, a first motor, a first pulley, a cooling fan, a second pulley and a belt. When the cooling water circulates, the first motor can drive the first pulley to rotate. The rotation of the first pulley can drive the second pulley and the cooling fan to rotate through the belt. The cooling fan can drive the outside air to blow quickly to the surface of the radiator under the action of the rotation, so that the cooling water flowing through the inside of the radiator can be effectively cooled, so as to ensure that the compressed air flowing through the inside of the cooling box can be stably cooled by heat exchange during the circulation of the cooling water.

[0023] 4. The present invention facilitates personnel to observe the air pressure inside the first pressure-stabilizing tank and the second pressure-stabilizing tank by setting a pressure monitoring gauge. The fourth switch valve facilitates personnel to close the pipeline from the first pressure-stabilizing tank to the third manifold. The supporting bracket is provided to achieve the purpose of supporting the bottom of the first manifold, the second manifold and the third manifold. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a stereogram of the present invention;

[0025] Figure 2 This is a schematic diagram of the left side structure of the second pressure stabilizing tank of the present invention;

[0026] Figure 3 It is a schematic diagram of the cross-sectional structure of the right side of the circulation box of the present invention;

[0027] Figure 4 It is a schematic diagram of the front cross-sectional structure of the filter box of the present invention.

[0028] In the figure: 1, first pressure-stabilizing tank; 2, piston compressor; 3, cooling box; 4, circulation box; 5, first switch valve; 6, second pressure-stabilizing tank; 7, air guide cylinder; 8, degreasing dryer; 9, second switch valve; 10, air storage tank; 11, third switch valve; 12, first manifold; 13, filter screen cylinder; 14, second manifold; 15, third manifold; 16, fourth switch valve; 17, second bevel gear; 18, cleaning scraper; 19, guide slide rod; 20, filter box; 21, air blast machine; 22, the sixth switch valve; 23, the seventh switch valve; 24, the standard flow meter; 25, the first regulating valve; 26, the fixing frame; 27, the supporting spring; 28, the baffle; 29, the fifth switch valve; 30, the flow meter to be tested; 31, the second regulating valve; 32, the plate heat exchanger; 33, the water pump; 34, the first motor; 35, the first pulley; 36, the belt; 37, the second pulley; 38, the partition; 39, the cooling fan; 40, the radiator; 41, the second motor; 42, the first bevel gear. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0031] Embodiment 1:

[0032] See also Figure 1-Figure 4 As shown, the present invention provides a loop device for calibrating a high-pressure gas flowmeter, comprising a piston compressor 2, a circulation box 4, a first manifold 12, a second manifold 14 and a third manifold 15, the input end of the piston compressor 2 is fixedly mounted with a first pressure-stabilizing tank 1 through a pipeline, the output end of the piston compressor 2 is fixedly mounted with a cooling box 3 through a pipeline, a water pump 33 is fixedly mounted at the lower end of the front surface of the circulation box 4 through a pipeline, a plate heat exchanger 32 is fixedly mounted between the output end of the water pump 33 and the inner cavity of the cooling box 3 through a pipeline, a radiator 40 is fixedly mounted between the top of the plate heat exchanger 32 and the top of the outer surface of the circulation box 4 through a pipeline, the back of the radiator 40 is fixedly mounted on the back of the circulation box 4 through a pipeline, and a first switch valve is fixedly mounted on the left side of the cooling box 3 through a pipeline. 5, a second pressure stabilizing tank 6 is fixedly installed on the left side of the first switch valve 5 through a pipeline, a second switch valve 9, an oil removal dryer 8, an air storage tank 10, a sixth switch valve 22, a blower 21 and a filter box 20 are fixedly installed on the left side of the second pressure stabilizing tank 6 from right to left through a pipeline, a third switch valve 11 is fixedly installed between the front surface of the second pressure stabilizing tank 6 and the left side of the first manifold 12 through a pipeline, a seventh switch valve 23, a standard flow meter 24 and a first regulating valve 25 are fixedly installed between the right side of the first manifold 12 and the left side of the second manifold 14 from left to right through a pipeline, and a fifth switch valve 29, a flow meter to be inspected 30 and a second regulating valve 31 are fixedly installed between the right side of the second manifold 14 and the left side of the third manifold 15 from left to right through a pipeline.

[0033] In the present technical solution, the high-pressure gas can be driven during the detection and calibration of the high-pressure gas flowmeter by using a piston compressor 2. Since the piston ring inside the piston compressor 2 can effectively seal the piston and the cylinder during operation to avoid gas leakage, compared with the traditional method of using a vane axial flow compressor to compress air, the piston compressor 2 is greatly improved in gas compression efficiency, thereby effectively reducing the overall energy consumption generated during operation, and at the same time reducing the heat generated during the overall operation. Therefore, during the overall operation, the temperature of the compressed air can be cooled to the range required for the detection and calibration operation by a single water cooling method. Moreover, since the first pressure stabilizing tank 1 and the second pressure stabilizing tank 6 are respectively installed on one side of the input end and the output end of the piston compressor 2, the piston compressor 2 is effectively prevented from forming a pulsating flow state of the compressed air during operation, and the gas in the second pressure stabilizing tank 6 is kept in a relatively static state, which is conducive to the heat of the compressed air being dissipated into the environment.

[0034] Embodiment 2:

[0035] Based on the first embodiment, the present invention is as follows Figure 4 As shown, it is disclosed that a baffle 28 is fixedly connected to the upper end of the inner cavity of the filter box 20, a second motor 41 is fixedly installed on the left end of the top of the baffle 28, a first bevel gear 42 is fixedly installed on the output end of the second motor 41, the middle end of the baffle 28 is movably connected to the air guide cylinder 7 through a bearing, a second bevel gear 17 is fixedly installed on the upper end of the air guide cylinder 7, the second bevel gear 17 is meshed with the first bevel gear 42, a filter screen cylinder 13 is fixedly installed on the bottom of the air guide cylinder 7, a fixing frame 26 is fixedly connected to the lower end of the right side of the inner cavity of the filter box 20, a supporting spring 27 is fixedly connected to the middle end of the left side of the fixing frame 26, a cleaning scraper 18 is fixedly connected to the left side of the supporting spring 27, the surface of the cleaning scraper 18 is movably connected to the surface of the filter screen cylinder 13, both ends of the right side of the cleaning scraper 18 are fixedly connected to guide slide bars 19, and the surface of the guide slide bar 19 is movably connected to the left side of the fixing frame 26.

[0036] In the present technical solution, by setting the baffle 28, the air guide cylinder 7 and the filter screen cylinder 13, the dust in the air flowing through the filter box 20 can be effectively filtered and intercepted, and the cleanliness of the air delivered by the blower 21 can be effectively improved. By setting the second motor 41, the first bevel gear 42, the second bevel gear 17 and the cleaning scraper 18, the air guide cylinder 7 and the filter screen cylinder 13 can be driven to rotate through the first bevel gear 42 and the second bevel gear 17 under the action of the second motor 41, so that the cleaning scraper 18 can rotate during the rotation of the filter screen cylinder 13. During the cleaning process, the dust and impurities attached to the surface are scraped off and cleaned, which effectively avoids the filter cylinder 13 from being blocked and affecting the air circulation, and reduces the frequency of maintenance and replacement. Through the arrangement of the fixing frame 26, the supporting spring 27 and the guiding slide bar 19, the right side of the cleaning scraper 18 can be elastically supported and guided to avoid the cleaning scraper 18 from tilting due to the force, while allowing the cleaning scraper 18 to maintain contact with the filter cylinder 13. The lower end of the left side of the filter box 20 is fixedly connected to the air inlet pipe, and the lower end of the front surface of the filter box 20 is movably connected to a maintenance door through a hinge.

[0037] Embodiment three:

[0038] Based on the first embodiment, the present invention is as follows Figure 3 As shown, a partition 38 is fixedly connected to the upper end of the inner cavity of the circulation box 4, a first motor 34 is fixedly installed at the middle end of the top of the partition 38, a first pulley 35 is fixedly installed at the output end of the first motor 34, both ends of the partition 38 are movably connected to a cooling fan 39 through bearings, a second pulley 37 is fixedly installed at the bottom of the cooling fan 39, a belt 36 is transmission-connected between the surface of the second pulley 37 and the surface of the first pulley 35, and air guide holes are opened all around the upper end of the circulation box 4, and the shape of the air guide holes is rectangular.

[0039] In the present technical solution, through the arrangement of the partition 38, the first motor 34, the first pulley 35, the cooling fan 39, the second pulley 37 and the belt 36, when the cooling water circulates, the first motor 34 can drive the first pulley 35 to rotate, and the rotation of the first pulley 35 can drive the second pulley 37 and the cooling fan 39 to rotate through the belt 36, so that the cooling fan 39 can drive the outside air to blow quickly to the surface of the radiator 40 under the action of rotation, so that the cooling water flowing through the inside of the radiator 40 can be effectively cooled, so as to ensure that the compressed air flowing through the inside of the cooling box 3 can be stably cooled by heat exchange during the circulation of the cooling water.

[0040] Embodiment 4:

[0041] Based on the first embodiment, the present invention is as follows Figure 1 and Figure 2As shown, it is disclosed that pressure monitoring gauges are fixedly installed on the top of the first pressure-stabilizing tank 1 and the top of the second pressure-stabilizing tank 6, respectively, a fourth switch valve 16 is fixedly installed between the right side of the first pressure-stabilizing tank 1 and the right side of the third manifold 15 through a pipeline, and the bottoms of the first manifold 12, the second manifold 14 and the third manifold 15 are fixedly connected with supporting brackets.

[0042] In the present technical solution, by setting up a pressure monitoring gauge, it is convenient for personnel to observe the air pressure inside the first pressure-stabilizing tank 1 and the second pressure-stabilizing tank 6. By setting up the fourth switch valve 16, it is convenient for personnel to close the pipeline between the first pressure-stabilizing tank 1 and the third manifold 15. By setting up a supporting bracket, the purpose of supporting the bottom of the first manifold 12, the second manifold 14 and the third manifold 15 is achieved.

[0043] Embodiment five:

[0044] A working method of a loop device for calibrating a high-pressure gas flowmeter, the working method comprising the following steps:

[0045] A. First, after the flowmeter 30 to be tested and calibrated is installed between the fifth switch valve 29 and the second regulating valve 31, the blower 21 is started to extract the filtered air inside the filter box 20, and the air is transported to the second pressure stabilizing tank 6, the first manifold 12, the second manifold 14, the third manifold 15, the first pressure stabilizing tank 1 and the cooling box 3 through the sixth switch valve 22, the air storage tank 10, the second switch valve 9 and the oil removal dryer 8;

[0046] B. When the delivered air pressure meets the requirements of the detection and calibration operation, the second switch valve 9 is controlled to be closed and the piston compressor 2 is started to work so that the air in the first pressure stabilizing tank 1 can be extracted and compressed, and the compressed air flow can be delivered to the interior of the cooling box 3;

[0047] C. The cooling water in the circulation box 4 can be extracted by the water pump 33, and while being transported to the inside of the plate heat exchanger 32 through the pipeline, the cooling water can flow back to the inside of the circulation box 4 through the radiator 40 and the pipeline, thereby realizing the circulation of the cooling water. When the cooling water flows through the plate heat exchanger 32, it can effectively exchange heat with the compressed air flowing through the cooling box 3, so that the temperature of the compressed air can be cooled to the range required for the detection and calibration operation under the action of heat exchange;

[0048] D. Subsequently, the high-pressure air after cooling inside the cooling box 3 can be transported to the inside of the flow meter to be tested 30 installed between the fifth switch valve 29 and the second regulating valve 31 through the first switch valve 5, the second pressure-stabilizing tank 6, the third switch valve 11, the first manifold 12, the seventh switch valve 23, the standard flow meter 24, the first regulating valve 25 and the second manifold 14 in sequence, so that the standard flow meter 24 and the flow meter to be tested 30 can monitor the flow rate of the high-pressure air passing through the inside, and the personnel can calibrate the flow meter to be tested 30 according to the data monitored by the standard flow meter 24.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A high-pressure gas flow meter calibration loop device, comprising a piston compressor (2), a circulation box (4), a first manifold (12), a second manifold (14) and a third manifold (15), characterized in that: A first pressure stabilizing tank (1) is fixedly mounted on the input end of the piston compressor (2) via a pipeline, a cooling box (3) is fixedly mounted on the output end of the piston compressor (2) via a pipeline, a water pump (33) is fixedly mounted on the lower end of the front surface of the circulation box (4) via a pipeline, a plate heat exchanger (32) is fixedly mounted between the output end of the water pump (33) and the inner cavity of the cooling box (3) via a pipeline, a radiator (40) is fixedly mounted on the top of the plate heat exchanger (32) and the top of the outer surface of the circulation box (4) via a pipeline, the back of the radiator (40) is fixedly mounted on the back of the circulation box (4) via a pipeline, a first switch valve (5) is fixedly mounted on the left side of the cooling box (3) via a pipeline, a second pressure stabilizing tank (6) is fixedly mounted on the left side of the first switch valve (5) via a pipeline, and the first A second switch valve (9), an oil removal dryer (8), an air storage tank (10), a sixth switch valve (22), a blower (21) and a filter box (20) are fixedly installed in sequence from right to left on the left side of the second pressure stabilizing tank (6) through a pipeline; a third switch valve (11) is fixedly installed between the front surface of the second pressure stabilizing tank (6) and the left side of the first manifold (12) through a pipeline; a seventh switch valve (23), a standard flow meter (24) and a first regulating valve (25) are fixedly installed in sequence from left to right between the right side of the first manifold (12) and the left side of the second manifold (14) through a pipeline; a fifth switch valve (29), a flow meter to be tested (30) and a second regulating valve (31) are fixedly installed in sequence from left to right between the right side of the second manifold (14) and the left side of the third manifold (15) through a pipeline.

2. A high pressure gas flow meter calibration loop device according to claim 1, characterized in that: The upper end of the inner cavity of the filter box (20) is fixedly connected to a baffle plate (28), the left end of the top of the baffle plate (28) is fixedly mounted with a second motor (41), the output end of the second motor (41) is fixedly mounted with a first bevel gear (42), the middle end of the baffle plate (28) is movably connected to an air guide cylinder (7) via a bearing, the upper end of the air guide cylinder (7) is fixedly mounted with a second bevel gear (17), the second bevel gear (17) is meshed with the first bevel gear (42), the bottom of the air guide cylinder (7) is fixedly mounted with a filter screen cylinder (13), and the lower end of the right side of the inner cavity of the filter box (20) is fixedly connected with a fixing frame (26).

3. A high pressure gas flow meter calibration loop device according to claim 2, characterized in that: The middle end of the left side of the fixed frame (26) is fixedly connected to a support spring (27), the left side of the support spring (27) is fixedly connected to a cleaning scraper (18), the surface of the cleaning scraper (18) is movably connected to the surface of the filter screen cylinder (13), and both ends of the right side of the cleaning scraper (18) are fixedly connected to guide slide bars (19), and the surface of the guide slide bar (19) is movably connected to the left side of the fixed frame (26).

4. A high pressure gas flow meter calibration loop device according to claim 1, characterized in that: The lower end of the left side of the filter box (20) is fixedly connected to an air intake pipe, and the lower end of the front surface of the filter box (20) is movably connected to a maintenance door via a hinge.

5. A high pressure gas flow meter calibration loop device according to claim 1, characterized in that: A partition (38) is fixedly connected to the upper end of the inner cavity of the circulation box (4), a first motor (34) is fixedly installed at the middle end of the top of the partition (38), a first pulley (35) is fixedly installed at the output end of the first motor (34), both ends of the partition (38) are movably connected to a cooling fan (39) through bearings, a second pulley (37) is fixedly installed at the bottom of the cooling fan (39), and a belt (36) is connected to the surface of the second pulley (37) and the surface of the first pulley (35) for transmission.

6. A high pressure gas flow meter calibration loop device according to claim 1, characterized in that: Air guide holes are provided around the upper end of the circulation box (4), and the air guide holes are in a rectangular shape.

7. A high pressure gas flow meter calibration loop device according to claim 1, characterized in that: Pressure monitoring gauges are fixedly mounted on the top of the first pressure stabilizing tank (1) and the top of the second pressure stabilizing tank (6), respectively.

8. A high pressure gas flow meter calibration loop device according to claim 1, characterized in that: A fourth switch valve (16) is fixedly installed between the right side of the first pressure-stabilizing tank (1) and the right side of the third manifold (15) via a pipeline.

9. A high pressure gas flow meter calibration loop device according to claim 1, characterized in that: The bottoms of the first conduit (12), the second conduit (14) and the third conduit (15) are respectively fixedly connected to a bearing bracket.

10. A method for operating a loop device for calibrating a high-pressure gas flowmeter according to any one of claims 1 to 9, characterized in that: The working method comprises the following steps: A. First, after the flowmeter (30) to be tested and calibrated is installed between the fifth switch valve (29) and the second regulating valve (31), the blower (21) is started to extract the filtered air inside the filter box (20), and the air is transported to the second pressure stabilizing tank (6), the first manifold (12), the second manifold (14), the third manifold (15), the first pressure stabilizing tank (1) and the cooling box (3) through the sixth switch valve (22), the air storage tank (10), the second switch valve (9) and the oil removal dryer (8); B. When the delivered air pressure meets the requirements of the detection and calibration operation, the second switch valve (9) is controlled to be closed and the piston compressor (2) is started to work so that the air in the first pressure stabilizing tank (1) can be extracted and compressed, and the compressed air flow can be delivered to the interior of the cooling box (3); C. The cooling water in the circulation box (4) can be extracted by the water pump (33) and transported to the inside of the plate heat exchanger (32) through the pipeline. At the same time, the cooling water can flow back to the inside of the circulation box (4) through the radiator (40) and the pipeline, thereby realizing the circulation of the cooling water. When the cooling water flows through the plate heat exchanger (32), it can effectively exchange heat with the compressed air flowing through the cooling box (3), so that the temperature of the compressed air can be cooled to the range required for the detection and calibration operation under the action of heat exchange; D. Subsequently, the high-pressure air after being cooled in the cooling box (3) can be transported to the inside of the flow meter to be tested (30) installed between the fifth switch valve (29) and the second regulating valve (31) through the first switch valve (5), the second pressure-stabilizing tank (6), the third switch valve (11), the first manifold (12), the seventh switch valve (23), the standard flow meter (24), the first regulating valve (25) and the second manifold (14) in sequence, so that the standard flow meter (24) and the flow meter to be tested (30) can monitor the flow rate of the high-pressure air passing through the inside, and the personnel can calibrate the flow meter to be tested (30) according to the data monitored by the standard flow meter (24).

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