Pump body pressure test method

Abstract

The present application relates to the technical field of water pump, specifically refers to a kind of pump body pressure test method, including pump body, pump body flange of pump body is equipped with pump body pressure sealing mechanism, pump body pressure test method includes the following steps: first step: take connecting plug, install sealing ring on the front end surface of connecting plug, first piston connecting hole of connecting plug is loaded into pressure oil, spring, first piston and limit stop ring, second piston is loaded into the second piston connecting hole of connecting plug;Second step: locking draw hook passes through connecting plug and hooks pump body flange;Third step: jacking screw is connected with top plate through top plate, top plate is placed in locking draw hook, and the front end of jacking screw is in abutment with second piston;Fourth step: jacking screw is locked by rotating;Fifth step: pressure test;Sixth step: pump body pressure relief, rotate jacking screw, and remove pump body pressure sealing mechanism;The present application is ingenious in structure, easy to disassemble and assemble, good in sealing, closely connected, high in safety, time-saving and labor-saving.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water pump, in particular to a pump body pressure test method. BACKGROUND

[0002] It is known that, for the processing of pump body and pump cover castings, due to processing reasons, individual castings may produce shrinkage, shrinkage, sand eye, cracks and other casting defects, resulting in fluid leakage of the pump body during use and scrap, therefore, in the production process, pressure test process needs to be carried out on each pump body to ensure the pressure bearing capacity of the pump body.

[0003] The existing pressure test process uses double-headed bolts to fasten the pump body flange and flange plug in a certain order to ensure the sealing of the pump body and other pressure-bearing components, then water is injected into the pump body, and as the pressure in the pump body increases, the pressure in the pump body will be pushed to the inner wall of the pump body and the flange plug. In order to prevent high-pressure water from overflowing from the gap between the pump body flange and the flange plug, the operator usually tightens each double-headed bolt with maximum force. The substantive deficiencies of this test process are: first, even if the double-headed bolt is locked, as the water pressure increases, part of the water flow will still flow out from the gap between the pump body flange and the flange plug, affecting the pressure test, and even unable to complete the pressure test, which requires multiple tightening of the double-headed bolt, time-consuming and laborious; second, when the pressure test is completed, the operator needs to disassemble each double-headed bolt, which is labor-intensive and low in work efficiency; third, since the pressure test is always operated on the workbench, the workbench is wet and slippery, and if the force is not proper, the workpiece will slip out of the workbench, thereby causing unnecessary risk of injury. SUMMARY

[0004] The purpose of the present application is to solve the problems of the prior art and provide a pump body pressure test method which is ingenious in structure, convenient to disassemble and assemble, good in sealing, tightly connected, high in safety, time-saving and labor-saving.

[0005] To achieve the above purpose, the technical solution adopted by the present application is:

[0006] A pump body pressure test method, comprising a pump body, characterized in that: a pump body flange of the pump body is provided with a pump body pressure sealing mechanism, the pump body pressure sealing mechanism comprises a connecting plug, a locking hook, a first piston, a spring, a limiting check ring, a second piston, a top plate and a tightening screw rod, and the pump body pressure test method comprises the following steps:

[0007] First step: take the connecting plug, install the sealing ring on the front end face of the connecting plug, put the pressure oil into the first piston connecting hole of the connecting plug, then put the spring, then put the first piston into the first piston connecting hole, the first piston is in sealed sliding connection with the first piston connecting hole, the first piston connecting hole at the rear end of the first piston forms the first pressure cavity, then put the limiting check ring on the front end face of the first piston connecting hole, and limit the first piston in the first piston connecting hole, and the second piston is arranged in the second piston connecting hole at the rear end of the connecting plug, the outer diameter of the second piston is larger than that of the first piston, the second piston is in sealed sliding connection with the second piston connecting hole, the second piston connecting hole at the front end of the second piston forms the second pressure cavity, and the second pressure cavity is connected in communication with the first pressure cavity through the oil hole;

[0008] Second step: take the locking draw hook, pass the draw hook connecting hole on the connecting plug, then pass the draw hook limiting hole of the pump body flange, and hook the front end face of the pump body flange, the locking draw hooks are arranged at intervals, surround and clamp the connecting plug;

[0009] Third step: take the top plate and the jacking screw, the jacking screw is in threaded connection with the top plate by passing through the top plate, and the top plate and the jacking screw are put into the locking draw hook from the rear of the connecting plug;

[0010] Fourth step: rotate the jacking screw, the front end of the jacking screw abuts against the second piston, the front end of the second piston abuts against the connecting plug, the connecting plug is extruded and sealed with the pump body flange, the jacking screw is continuously rotated, the top plate moves axially rearward, the top plate moves rearward against the locking draw hook, the locking draw hook moves rearward, until the front end of the locking draw hook hooks the front end face of the pump body flange, the jacking screw is continuously rotated, the front end of the locking draw hook is in close contact with the pump body flange without gap, and the outside of the top plate is limited by the rear end of the locking draw hook and cannot move rearward any more;

[0011] Fifth step: start the pressure test: the pump body is flushed with water, the pressure in the pump body increases, when the pressure in the pump body is greater than the pressure of the spring in the first pressure cavity, the first piston moves rearward, the pressure oil enters the second pressure cavity from the first pressure cavity through the oil hole, the second piston moves rearward, the connecting plug moves forward, the rear end of the second piston is limited by the jacking screw, the top plate abuts against the locking draw hook and cannot move rearward, the connecting plug moves forward, is extruded by the sealing ring and the rear end face of the pump body flange, and sealing is realized;

[0012] Sixth step: after the pressure test, the pump body is depressurized, as the pressure in the pump body decreases, the first piston moves forward under the action of the spring rebound force, the pressure oil in the second pressure cavity flows back to the first pressure cavity through the oil return, the second piston moves forward, the rotating jacking screw, the top plate moves forward, the top plate and the locking hook are separated, the axis of the locking hook is adjusted to coincide with the axis of the hook connecting hole, the front end of the locking hook is separated from the pump body flange, the locking hook is pulled out backward, all the locking hooks are taken off in this way, the top plate and the connecting plug are taken off, and the pump body pressure test is completed.

[0013] The locking hook is provided with a hook plate section, a plug connecting section and a top plate limiting section from front to back, the front end of the plug connecting section is fixedly connected with the hook plate section, the rear end is fixedly connected with the top plate limiting section, the pump body flange is provided with hook limiting holes at intervals, the connecting plug is provided with hook connecting holes at intervals, the hook plate section passes through the hook limiting hole and is limited and fixed in abutment with the front end surface of the pump body flange, the outer diameter of the plug connecting section gradually increases from front to back, the outer diameter of the rear end of the plug connecting section is greater than the inner diameter of the hook connecting hole, the plug connecting section passes through the hook connecting hole, the plug connecting section clamps and connects with the connecting plug and is in sliding connection with the connecting plug, the outer diameter of the top plate limiting section gradually increases from front to back, the adjacent top plate limiting sections form a top plate limiting space, the caliber of the rear end of the top plate limiting space is smaller than the outer diameter of the top plate, so as to facilitate the limiting of the top plate.

[0014] The rear end of the top plate limiting section is provided with a limiting stop, the top plate limiting section is fixedly connected with the limiting stop, and the distance from the limiting stop to the center of the top plate is less than the radius of the top plate, so as to further limit the top plate through the limiting stop and prevent the top plate from sliding out of the locking hook.

[0015] The diameter length of the second piston is three times that of the first piston, so as to greatly increase the pushing force of the second piston on the connecting plug.

[0016] The present application has the advantages of ingenious structure, convenient disassembly and assembly, good sealing, tight connection, high safety, time and labor saving, etc. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present application.

[0018] Mark: pump body flange 1, pump body pressure sealing mechanism 2, connecting plug 3, locking hook 4, first piston 5, spring 6, limiting stop ring 7, second piston 8, top plate 9, jacking screw 10, hook connecting hole 11, first piston connecting hole 12, oil hole 13, second piston connecting hole 14, first pressure cavity 15, second pressure cavity 16, hook plate section 17, plug connecting section 18, top plate limiting section 19, limiting stop 20, sealing ring 21, pump body 22. DETAILED DESCRIPTION

[0019] The specific embodiments of the present application are described in further detail below with reference to the accompanying drawings.

[0020] A pump body pressure test method, comprising a pump body 22, characterized in that a pump body flange 1 of the pump body 22 is provided with a pump body pressure sealing mechanism 2, the pump body pressure sealing mechanism 2 comprises a connecting plug 3, a locking draw hook 4, a first piston 5, a spring 6, a limiting check ring 7, a second piston 8, a top plate 9 and a tightening screw rod 10,

[0021] The pump body pressure test method comprises the following steps:

[0022] First step: take the connecting plug 3, install a sealing ring 21 on the front end face of the connecting plug 3, then install pressure oil into the first piston connecting hole 12 of the connecting plug 3, then install the spring 6, then install the first piston 5 into the first piston connecting hole 12, the first piston 5 is in sealing sliding connection with the first piston connecting hole 12, the first piston connecting hole 12 at the rear end of the first piston 5 forms a first pressure cavity 15, then install the limiting check ring 7 on the front end face of the first piston connecting hole 12, and the first piston 5 is limited in the first piston connecting hole 12, then install the second piston 8 in the second piston connecting hole 14 at the rear end of the connecting plug 3, the outer diameter of the second piston 8 is larger than that of the first piston 5, the second piston 8 is in sealing sliding connection with the second piston connecting hole 14, the second piston connecting hole 14 at the front end of the second piston 8 forms a second pressure cavity 16, and the second pressure cavity 16 is in communication with the first pressure cavity 15 through the oil hole 13;

[0023] Second step: take the locking draw hook 4, pass the draw hook connecting hole 11 on the connecting plug 3, then pass the draw hook limiting hole of the pump body flange 1, then hook the front end face of the pump body flange 1, and the locking draw hook 4 is arranged at intervals to surround and clamp the connecting plug 3;

[0024] Third step: take the top plate 9 and the tightening screw rod 10, screw the tightening screw rod 10 through the top plate 9 and connect with the top plate 9, and place the top plate 9 and the tightening screw rod 10 into the locking draw hook 4 from the rear of the connecting plug 3;

[0025] Fourth step: rotate the tightening screw rod 10, the front end of the tightening screw rod 10 abuts against the second piston 8, the front end of the second piston 8 abuts against the connecting plug 3, the connecting plug 3 is extruded and sealed with the pump body flange 1, continue to rotate the tightening screw rod 10, the top plate 9 moves axially backward, the top plate 9 moves backward against the locking draw hook 4, the locking draw hook 4 moves backward with the top plate 9, until the front end of the locking draw hook 4 hooks the front end face of the pump body flange 1, continue to rotate the tightening screw rod 10, the front end of the locking draw hook 4 is in close contact with the pump body flange 1 without gap, and the outside of the top plate 9 cannot move backward any more due to the limitation of the rear end of the locking draw hook 4;

[0026] Fifth step: start pressure test: pump body 22 is flushed, the pressure in the pump body 22 increases, when the pressure in the pump body 22 is greater than the pressure of the spring 6 in the first pressure chamber 15, the first piston 5 moves backward, pushes the pressure oil from the first pressure chamber 15 into the second pressure chamber 16 through the oil hole 13, makes the second piston 8 move backward, the connecting plug 3 moves forward, the rear end of the second piston 8 is limited by the jacking screw 10, the top plate 9 is limited by the locking hook 4 and cannot move backward, the connecting plug 3 moves forward and is extruded by the sealing ring 21 and the rear end face of the pump body flange 1, so that the sealing is realized;

[0027] Sixth step: after the pressure test is finished, the pump body 22 is depressurized, with the decrease of the pressure in the pump body 22, the first piston 5 moves forward under the springback force of the spring 6, the pressure oil in the second pressure chamber 16 flows back to the first pressure chamber 15 through the oil hole 13, the second piston 8 moves forward, the jacking screw 10 is rotated, the top plate 9 moves forward, the top plate 9 is separated from the locking hook 4, the axis of the locking hook 4 is adjusted to be coincident with the axis of the hook connecting hole 11, the front end of the locking hook 4 is separated from the pump body flange 1, the locking hook 4 is pulled out backward, all the locking hooks 4 are taken off, the top plate 9 and the connecting plug 3 are taken off, and the pressure test of the pump body 22 is completed.

[0028] The locking hook 4 is provided with a hook plate section 17, a plug connecting section 18 and a top plate limiting section 19 from front to back, the front end of the plug connecting section 18 is fixedly connected with the hook plate section 17, the rear end is fixedly connected with the top plate limiting section 19, the pump body flange 1 is provided with hook limiting holes at intervals, the connecting plug 3 is provided with hook connecting holes 11 at intervals, the hook plate section 17 passes through the hook limiting holes and is limited and fixed by abutting against the front end face of the pump body flange 1, the outer diameter of the plug connecting section 18 gradually increases from front to back, the outer diameter of the rear end of the plug connecting section 18 is greater than the inner diameter of the hook connecting hole 11, the plug connecting section 18 passes through the hook connecting hole 11, clamps and slidably connects with the connecting plug 3, the outer diameter of the top plate limiting section 19 gradually increases from front to back, adjacent top plate limiting sections 19 form top plate limiting spaces, the caliber of the rear end of the top plate limiting space is smaller than the outer diameter of the top plate 9, so as to limit the top plate.

[0029] The rear end of the top plate limiting section 19 is provided with a limiting stop 20, the top plate limiting section 19 is fixedly connected with the limiting stop 20, the distance from the limiting stop 20 to the center of the top plate 9 is smaller than the radius of the top plate 9, so as to further limit the top plate by the limiting stop and prevent the top plate from sliding out of the locking hook.

[0030] The diameter length of the second piston 8 is three times of the diameter length of the first piston 5, so as to greatly increase the pushing force of the second piston on the connecting plug.

[0031] As shown in the accompanying drawings Figure 1, the automatic locking sealing mechanism 2 is assembled to the pump body flange 1 of the pump body 22 before use, the pump body flange 1 is in front, the connecting plug 3 is in back, the pull hook limiting hole is arranged on the pump body flange, the pull hook connecting hole 11 is arranged on the connecting plug 3, the pull hook connecting hole 11 corresponds to the pull hook limiting hole one by one, the distance from each pull hook connecting hole 11 to the center of the connecting plug 3 is equal, that is, the pull hook connecting hole 11 is distributed in the circumference, the pull hook connecting hole 11 can be arranged three or four, the locking pull hook 4 is sequentially threaded through the pull hook connecting hole 11, then threaded through the pull hook limiting hole, and then hooked to the front side of the pump body flange 1, all the locking pull hooks 4 surround and clamp the connecting plug 3, the front and back movement of the connecting plug 3 is guided, and the connecting plug 3 is kept on the plug connecting section 18 of the locking pull hook 4 at any time, the rear end of the locking pull hook 4 is limited by the top plate 9, as shown in the attached Figure 1 , the plug connecting section 19 of the locking pull hook 4 is just abutted against the top plate 9, the top plate 9 moves backward, which drives the locking pull hook 4 to move backward, so that the hook plate section 17 at the front end of the locking pull hook 4 is hooked to the front end of the pump body flange 1, the hook plate section 17 is arranged eccentrically, can be tightly attached to the pump body flange 1, so that the front end of the locking pull hook 4 is tightly hooked to the pump body flange 1 without gap, the rear end of the locking pull hook 4 is fixed by the top plate 9, thereby limiting and fixing the locking pull hook 4, the connecting plug 3 and the pump body flange 1, the jacking screw 10 is threaded through the top plate 9 and presses against the second piston 8, the second piston 8 abuts against the connecting plug 3 and abuts against the pump body flange 1, the front end of the connecting plug 3 has a sealing ring 21, the connecting plug 3 extrudes and seals the sealing ring 21 and the pump body flange 1, in the application, the ratio of the thrust of the second piston 8 to the thrust of the first piston 5 is equal to the ratio of the square of the radius of the second piston 8 to the square of the radius of the first piston 5, in the embodiment, the diameter of the first piston 5 is three times the diameter of the second piston 8, that is, the thrust of the second piston 8 is nine times the thrust of the first piston 5, as can be seen, in the pressure test, the pressure oil flowing into the second pressure chamber 16 acts to drive the second piston 8 to move backward, the second piston 8 is limited by the jacking screw and cannot move backward, the second piston 8 acts on the pressure oil, the pressure oil drives the connecting plug 3 to move forward and extrude the pump body flange 1 through the sealing ring 21, the thrust of the second piston 8 is amplified, and the thrust applied on the connecting plug 3 is always greater than the pressure in the pump body 22, thereby ensuring the smooth progress of the pressure test, the pump body 22 has a water inlet and a water outlet, water enters the water inlet to increase the pressure, and water exits the water outlet to release the pressure, at the same time, the structure of the application is ingenious, convenient to disassemble and assemble, good in sealing, without water seepage or outflow, and high in safety.

[0032] The application has the advantages of ingenious structure, convenient disassembly and assembly, good sealing, tight connection, high safety, time and labor saving, etc.

Claims

1. A method for testing the pressure bearing capacity of a pump body, comprising a pump body (22), characterized in that: The pump body (22) has a pump body pressure-bearing sealing mechanism (2) on its pump body flange (1). The pump body pressure-bearing sealing mechanism (2) includes a connecting plug (3), a locking hook (4), a first piston (5), a spring (6), a limiting retaining ring (7), a second piston (8), a top plate (9), and a tightening screw (10). The pump body pressure-bearing test method Includes the following steps: Step 1: Take the connecting plug (3), install the sealing ring (21) on the front end face of the connecting plug (3), fill the first piston connecting hole (12) of the connecting plug (3) with pressurized oil, then install the spring (6), and then install the first piston (5) into the first piston connecting hole (12). The first piston (5) and the first piston connecting hole (12) are in a sealed sliding connection. The first piston connecting hole (12) at the rear end of the first piston (5) forms the first pressure chamber (15). Then install the limit stop on the front end face of the first piston connecting hole (12). Ring (7) limits the first piston (5) in the first piston connection hole (12), and install the second piston (8) in the second piston connection hole (14) at the rear end of the connecting plug (3). The outer diameter of the second piston (8) is larger than the outer diameter of the first piston (5). The second piston (8) and the second piston connection hole (14) are sealed and slidably connected. The second piston connection hole (14) at the front end of the second piston (8) forms a second pressure chamber (16). The second pressure chamber (16) is connected to the first pressure chamber (15) through the oil hole (13). Step 2: Take the locking hook (4), pass the locking hook (4) through the hook connection hole (11) on the connecting plug (3), and then through the hook limiting hole of the pump body flange (1) to hook the front end face of the pump body flange (1). The locking hooks (4) are spaced apart to surround and clamp the connecting plug (3). Step 3: Take the top plate (9) and the tightening screw (10). The tightening screw (10) passes through the top plate (9) and is threaded to the top plate (9). Put the top plate (9) and the tightening screw (10) into the locking hook (4) from behind the connecting plug (3). Step 4: Rotate the tightening screw (10), the front end of the tightening screw (10) abuts against the second piston (8), the front end of the second piston (8) abuts against the connecting plug (3), the connecting plug (3) and the pump body flange (1) are squeezed and sealed, continue to rotate the tightening screw (10), the top plate (9) moves backward axially, the top plate (9) moves backward against the locking hook (4), and moves backward with the locking hook (4) until the front end of the locking hook (4) hooks the front end face of the pump body flange (1), then continue to rotate the tightening screw (10), the front end of the locking hook (4) is in close contact with the pump body flange (1) without gap, the outer side of the top plate (9) is limited by the rear end of the locking hook (4) and cannot move backward anymore; Step 5: Start the pressure test: flush the pump body (22) with water. The pressure inside the pump body (22) will increase accordingly. When the pressure inside the pump body (22) is greater than the pressure of the spring (6) in the first pressure chamber (15), the first piston (5) moves backward and pushes the pressure oil from the first pressure chamber (15) through the oil hole (13) into the second pressure chamber (16). This causes the second piston (8) to move backward and the connecting plug (3) to move forward. The rear end of the second piston (8) is limited by the tightening screw (10). The top plate (9) and the locking hook (4) are abutted and limited and cannot move backward. The connecting plug (3) moves forward and is squeezed by the sealing ring (21) against the rear end face of the pump body flange (1) to achieve a seal. Step 6: After the pressure test, depressurize the pump body (22). As the pressure inside the pump body (22) decreases, the first piston (5) moves forward under the action of the spring (6). The pressurized oil in the second pressure chamber (16) flows back to the first pressure chamber (15) through the oil hole (13). The second piston (8) moves forward accordingly. Rotate the tightening screw (10) to make the top plate (9) move forward. The top plate (9) separates from the locking hook (4). Adjust the axis of the locking hook (4) and the hook connection hole (11) to align with the axis of the locking hook (4). The axes of the locking hooks (4) coincide, causing the front end of the locking hook (4) to separate from the pump body flange (1). Pull the locking hook (4) backward and remove all the locking hooks (4) in this way. Then remove the top plate (9) and the connecting plug (3) to complete the pressure test of the pump body (22). The locking hook (4) is provided with a hook plate section (17), a plug connecting section (18) and a top plate limiting section (19) from front to back. The front end of the plug connecting section (18) is fixedly connected to the hook plate section (17), and the rear end is fixedly connected to the top plate limiting section (19). The pump body flange (1) is provided with hook limiting holes at intervals, and the connecting plug (3) is provided with hook connecting holes (11) at intervals. The hook plate section (17) passes through the hook limiting holes and abuts against the front end face of the pump body flange (1) for limiting and fixing. The outer diameter of the plug connecting section (18) gradually increases from front to back. The outer diameter of the rear end of the plug connecting section (18) is larger than the inner diameter of the hook connecting hole (11). The plug connecting section (18) passes through the hook connecting hole (11) and clamps the connecting plug. Connecting plug (3) and sliding connection with connecting plug (3), the outer diameter of the top plate limiting section (19) gradually increases from front to back, and adjacent top plate limiting sections (19) form a top plate limiting space. The diameter of the rear end of the top plate limiting space is smaller than the outer diameter of the top plate (9). The rear end of the top plate limiting section (19) is provided with a limiting baffle (20). The top plate limiting section (19) and the limiting baffle (20) are fixedly connected. The distance from the limiting baffle (20) to the center of the top plate (9) is smaller than the radius of the top plate (9).

2. The pump body pressure testing method according to claim 1, characterized in that: The diameter of the second piston (8) is three times that of the first piston (5).

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