A pressure test device for electromagnetic flowmeter and use method thereof

Abstract

This invention discloses a pressure testing device and its method for use with electromagnetic flowmeters. The device includes two pressure pipes, sealing gaskets, two pressure probes, a support rod, a connecting rod, two vent valves, a sealing ring, and a pressure pump. One end of each pressure pipe is connected to the pressure pump, and the other end, after placing the sealing gasket, is connected to the two pressure probes. The support rod is connected to the connecting rod; the support rod and the connecting rod are respectively connected to the two pressure probes; the two vent valves are respectively installed on the two pressure probes. This device allows for hydrostatic testing of the electrodes when manufacturing large-diameter electromagnetic flowmeters, solving the problem in existing technologies where hydrostatic testing is impossible due to the bulky and cumbersome equipment required. After electrode installation, the device is used to verify the product through hydrostatic testing, eliminating potential quality issues in the electromagnetic flowmeter.

Description

Technical Field

[0001] The invention relates to process equipment for manufacturing an electromagnetic flowmeter, and in particular to a pressure testing device for an electromagnetic flowmeter and a use method thereof. Background Art

[0002] The water pressure test is an essential process in the manufacture of electromagnetic flowmeters. However, when producing large-caliber electromagnetic flowmeters (≥DN500), the water pressure test cannot be performed because the required equipment is too large and heavy. The electrodes cannot be verified by the water pressure test after installation, which leaves hidden dangers in the product quality of the electromagnetic flowmeter. Therefore, a simple and convenient water pressure test device has become the key to the production of large-caliber electromagnetic flowmeters (≥DN500). Summary of the invention

[0003] The purpose of the present invention is to provide a pressure test device for an electromagnetic flowmeter and a method of use, wherein the device can perform a water pressure test on electrodes when manufacturing large-caliber electromagnetic flowmeters (≥DN500).

[0004] The technical solution adopted by the present invention to achieve the above-mentioned purpose is: a pressure testing device for an electromagnetic flowmeter includes two pressure tubes, a sealing gasket, two pressure probes, a support rod, a connecting rod, two air release valves, a sealing ring, and a pressure pump. One end of the two pressure tubes is respectively connected to the pressure pump, and the other end is respectively connected to the two pressure probes after a sealing gasket is placed; the support rod is connected to the connecting rod; the support rod and the connecting rod are respectively connected to the two pressure probes; the two air release valves are respectively installed on the two pressure probes.

[0005] The two pressure probes have the same structure and both include a cylinder with a ball head at one end, which is used to connect the support rod and the connecting rod respectively. The other end of the cylinder is provided with a groove for placing the sealing ring, and the two pressure probes are respectively buckled on the measuring tube to be measured through the groove; a first inner hole is provided in the axial direction of the cylinder, and a threaded sleeve is welded perpendicular to the axial direction of the cylinder, and a second inner hole is provided in the axial direction of the threaded sleeve, the second inner hole is communicated with the first inner hole, and the two pressure probes are respectively connected to the two pressure tubes through the threaded sleeves; internal threaded vents are respectively provided on the two pressure probes, which are connected to the two air release valves through the internal threaded vents.

[0006] One end of the support rod is provided with a third inner hole, and one end of the connecting rod is provided with a fourth inner hole, and the fourth inner hole is the same as the third inner hole; the other end of the support rod is provided with an external thread, and the other end of the connecting rod is provided with an internal thread, and the support rod is threadedly connected with the connecting rod; the ball heads on the two pressure measuring head cylinders are respectively inserted into the third inner hole of the support rod and the fourth inner hole of the connecting rod.

[0007] The two air release valves have the same structure, and are threaded plugs with a 90° taper at the front end, which are used for threaded connection with the internal threaded vent holes on the two pressure measuring heads.

[0008] The method for using the pressure test device for an electromagnetic flowmeter comprises the following steps:

[0009] Step 1: Screw the external thread at one end of the support rod into the internal thread of the connecting rod.

[0010] Step 2: Place the sealing rings into the grooves of the two pressure probes respectively, and screw the two air vents into the internal threaded vent holes of the two pressure probes respectively.

[0011] The third step is to connect one end of the two pressure tubes to the pressure pump respectively, and place sealing gaskets on the other ends and connect them to the threaded sleeves on the two pressure probe cylinders respectively.

[0012] Step 4: insert the cylinders with ball heads on the two pressure measuring heads into the third inner hole of the support rod and the fourth inner hole of the connecting rod respectively.

[0013] Step 5: buckle the groove with a sealing ring on one pressure measuring head onto the electrode at one end of the measuring tube to be measured, and buckle the groove with a sealing ring on the other pressure measuring head onto the corresponding electrode at the other end of the measuring tube to be measured.

[0014] Step 6. Tighten the support rod so that the two pressure probes are pressed tightly against the measuring tube to be measured.

[0015] Step 7. Turn on the pressure pump to test the pressure, loosen the air bleed valve, and when the gas in the two pressure measuring heads is emptied and water flows out, tighten the air bleed valve.

[0016] Step 8. After pressurizing the pressure pump to the required value, turn off the pressure pump, and then maintain and release the pressure.

[0017] Step 9. Rotate the support rod in the opposite direction to loosen and remove the two pressure probes, thus completing the pressure testing process of the measuring tube.

[0018] The beneficial effect of the present invention is that when manufacturing a large-caliber electromagnetic flowmeter (≥DN500), a water pressure test can be performed on the electrode, solving the problem in the prior art that the water pressure test cannot be performed due to the large and heavy equipment required. After the electrode is installed, the present invention is used to verify the water pressure test, eliminating the hidden dangers in the quality of the electromagnetic flowmeter product. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the main structure of the present invention;

[0020] Figure 2 It is a left side schematic diagram of the structure of the present invention;

[0021] Figure 3 for Figure 2 An enlarged cross-sectional view of the middle support rod;

[0022] Figure 4 for Figure 2 an enlarged cross-sectional view of the middle connecting rod;

[0023] Figure 5 for Figure 2 Front view of the middle pressure probe;

[0024] Figure 6 for Figure 2 Top view of the pressure probe;

[0025] Figure 7 for Figure 2 Front view of the middle air release valve. DETAILED DESCRIPTION

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0027] like Figure 1 , Figure 2 , Figure 5 , Figure 6 As shown, one end of the two pressure pipes 1 of the device is connected to the pressure pump 8 (portable pressure pump), and the other end is connected to the two pressure measuring heads 3 after the sealing pad 2 is placed. The support rod 4 is connected to the connecting rod 5; the support rod 4 and the connecting rod 5 are connected to the two pressure measuring heads 3 respectively; and two air release valves 6 are installed on the two pressure measuring heads 3 respectively. The two pressure probes 3 have the same structure and both include a cylinder with a ball head 16 at one end, which is used to connect the support rod 4 and the connecting rod 5 respectively. The other end of the cylinder is provided with a groove 18 for placing the sealing ring 7. The two pressure probes 3 are respectively buckled on the measuring tube 9 to be measured through the groove 18; a first inner hole 14 is provided in the axial direction of the cylinder, and a threaded sleeve 12 is welded perpendicular to the axial direction of the cylinder, and a second inner hole 13 is provided in the axial direction of the threaded sleeve 12, and the second inner hole 13 is communicated with the first inner hole 14. The two pressure probes 3 are respectively connected to the two pressure tubes 1 through the threaded sleeves 12; the two pressure probes 3 are respectively provided with internal threaded vents 17, which are connected to the two air release valves 6 through the internal threaded vents 17.

[0028] like Figure 2 , Figure 3 , Figure 4As shown, the support rod 4 and the connecting rod 5 of the device are both metal rods, one end of the support rod 4 is provided with a third inner hole 10, one end of the connecting rod 5 is provided with a fourth inner hole 11, and the fourth inner hole 11 is the same as the third inner hole 10; the other end of the support rod 4 is provided with an external thread, the other end of the connecting rod 5 is provided with an internal thread, and the support rod 4 is threadedly connected with the connecting rod 5; the ball heads 16 on the cylinders of the two pressure measuring heads 3 are respectively inserted into the third inner hole 10 of the support rod 4 and the fourth inner hole 11 of the connecting rod 5.

[0029] like Figure 7 As shown, the two air release valves 6 of the device have the same structure, and are threaded plugs with a 90° taper at the front end, which are used for threaded connection with the internal threaded vent holes 17 on the two pressure measuring heads 3.

[0030] like Figures 1 to 7 As shown, the method for using the device has the following steps:

[0031] The first step is to screw the external thread at one end of the support rod 4 into the internal thread of the connecting rod 5.

[0032] In the second step, the sealing rings 7 are respectively placed into the grooves 18 of the two pressure measuring heads, and the two air release valves 6 are respectively screwed into the internal threaded vent holes 17 of the two pressure measuring heads 3.

[0033] Step 3: Connect one end of the two pressure tubes 1 to the pressure pump 8 respectively (note: the two pressure tubes 1 connected to the pressure pump should be on the same side), and place the sealing gasket 2 on the other end and connect them to the threaded sleeves 12 on the cylinders of the two pressure probes 3 respectively.

[0034] Step 4: insert the cylinders with ball heads 16 on the two pressure measuring heads 3 into the third inner hole 10 of the support rod 4 and the fourth inner hole 11 of the connecting rod 5 respectively.

[0035] Step 5: buckle the groove 18 with the sealing ring 7 on one pressure probe 3 onto one end electrode of the measured tube 9, and buckle the groove 18 with the sealing ring 7 on the other pressure probe 3 onto the corresponding other end electrode of the measured tube 9.

[0036] Step 6: Tighten the support rod 4 so that the two pressure measuring heads 3 are pressed against the measuring tube 9 to be measured.

[0037] Step 7: Turn on the pressure pump 8 to test the pressure, loosen the air release valve 6, and when the gas in the two pressure measuring heads 3 is emptied and water flows out, tighten the air release valve 6.

[0038] Step 8. After the pressure pump 8 is pressurized to the required value, the pressure pump 8 is turned off, and then the pressure is maintained and released.

[0039] Step 9: Rotate the support rod 4 in the opposite direction to loosen and remove the two pressure probes 3, thus completing the pressure test process of the measured measuring tube 9.

[0040] The material used for the pressure probe 3 of the device is 304 stainless steel, and through turning, the cavity 15, the first inner hole 14, the groove 18 and the cylinder with the ball head 16 are processed. Then the internal thread vent hole 17 and the second inner hole 13 are processed by the fitter. Finally, the threaded sleeve 12 is welded on the cylinder.

[0041] The support rod 4 is made of Q235A, and is turned to produce an external thread and a third inner hole 10. The other side is then milled.

[0042] The material used for the connecting rod 5 is Q235A, and the internal thread and the fourth inner hole 11 are processed by turning.

[0043] The material used for the air release valve 6 is 304 stainless steel, which is processed by turning.

[0044] The remaining sealing gaskets 2 and sealing rings 7 are standard parts.

[0045] The working principle of this device: Figure 2 As shown, connect the device. Turn on the pressure pump 8, and the water flows from the pump body through the pressure pipe 1, the threaded sleeve 12, the second inner hole 13, and the first inner hole 14 to the cavity 15. Loosen the bleed valve 6 to release the gas in the cavity 15, so that the water fills the cavity 15 and contacts the electrode on the workpiece 9 to be measured. Tighten the bleed valve 6 when water flows out from the internal thread vent 17. When the pressure reaches the required value, turn off the pressure pump 8, maintain the pressure for the specified time, and release the pressure. Rotate the support rod 4 in the opposite direction to loosen and remove the two pressure probes 3.

[0046] Use a megohmmeter to detect the insulation resistance of the electrode on the measured measuring tube 9 to the ground. If it is >200MΩ, it is qualified. Otherwise, the electrode on the measured measuring tube 9 needs to be reassembled.

Claims

1. A pressure test device for an electromagnetic flowmeter, characterized in that: The invention comprises two pressure tubes (1), a sealing pad (2), two pressure measuring heads (3), a support rod (4), a connecting rod (5), two air release valves (6), a sealing ring (7), and a pressure pump (8); one end of the two pressure tubes (1) is respectively connected to the pressure pump (8), and the other end is respectively connected to the two pressure measuring heads (3) after the sealing pad (2) is placed thereon; the support rod (4) is connected to the connecting rod (5); the support rod (4) and the connecting rod (5) are respectively connected to the two pressure measuring heads (3); and the two air release valves (6) are respectively mounted on the two pressure measuring heads (3); The two pressure measuring heads (3) have the same structure, and both comprise a cylinder with a ball head (16) at one end, which is used to connect the support rod (4) and the connecting rod (5) respectively; the other end of the cylinder is provided with a groove (18) for accommodating the sealing ring (7); the two pressure measuring heads (3) are buckled on the measuring tube (9) to be measured through the groove (18); a first inner hole (14) is provided in the axial direction of the cylinder, a threaded sleeve (12) is welded in a direction perpendicular to the axial direction of the cylinder, and a second inner hole (13) is provided in the axial direction of the threaded sleeve (12); the second inner hole (13) is communicated with the first inner hole (14); the two pressure measuring heads (3) are connected to the two pressure tubes (1) respectively through the threaded sleeve (12); the two pressure measuring heads (3) are provided with internal threaded vent holes (17) respectively, and are connected to the two air release valves (6) through the internal threaded vent holes (17); A third inner hole (10) is provided at one end of the support rod (4), and a fourth inner hole (11) is provided at one end of the connecting rod (5), and the fourth inner hole (11) is the same as the third inner hole (10); an external thread is provided at the other end of the support rod (4), and an internal thread is provided at the other end of the connecting rod (5), and the support rod (4) and the connecting rod (5) are threadedly connected; the ball heads (16) on the cylindrical bodies of the two pressure measuring heads (3) are respectively inserted into the third inner hole (10) of the support rod (4) and the fourth inner hole (11) of the connecting rod (5); The two air release valves (6) have the same structure, and are threaded plugs with a 90° taper at the front end, and are used for threaded connection with the internal threaded vent holes (17) on the two pressure measuring heads (3).

2. A method for using the pressure test device for an electromagnetic flowmeter as claimed in claim 1, characterized in that: The method of use has the following steps: The first step is to screw the external thread of one end of the support rod (4) into the internal thread of the connecting rod (5); Step 2: Place the sealing rings (7) into the grooves (18) of the two pressure measuring heads (3), and screw the two air release valves (6) into the internal threaded vent holes (17) of the two pressure measuring heads (3); Step 3: Connect one end of the two pressure pipes (1) to the pressure pump (8) respectively, and place a sealing gasket (2) on the other end and connect it to the threaded sleeves (12) on the cylinders of the two pressure measuring heads (3) respectively; Step 4: insert the cylinders with ball heads (16) on the two pressure measuring heads (3) into the third inner hole (10) of the support rod (4) and the fourth inner hole (11) of the connecting rod (5) respectively; Step 5: buckle the groove (18) with the sealing ring (7) on one pressure measuring head (3) onto the electrode at one end of the measuring tube (9) to be measured, and buckle the groove (18) with the sealing ring (7) on the other pressure measuring head (3) onto the corresponding electrode at the other end of the measuring tube (9) to be measured; Step 6: Tighten the support rod (4) so ​​that the two pressure measuring heads (3) are pressed against the measuring tube (9) to be measured; Step 7: Start the pressure pump (8) to test the pressure, loosen the air release valve (6), and when the gas in the two pressure measuring heads (3) is emptied and water flows out, tighten the air release valve (6); Step 8: After the pressure pump (8) is pressurized to the required value, the pressure pump (8) is turned off, and then the pressure is maintained and released; Step 9: Rotate the support rod (4) in the opposite direction to loosen and remove the two pressure probes (3), thus completing the pressure test process of the measured measuring tube (9).

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