Mechanical pressure steel pipe overpressure protection device

Abstract

The utility model relates to the field of steel pipe water pressure detection, and discloses a mechanical pressure steel pipe overpressure protection device, which comprises a water pressure balancing device and an overpressure triggering device, and the water pressure balancing device is in threaded connection with a mounting seat of the overpressure triggering device; the water pressure balancing device comprises a pipe joint, an end cover, a cylinder sleeve, a piston, a supporting barrel, a guide rod, a compression spring and an adjusting screw rod, the pipe joint is installed on the end cover through threads, a pressure water source of the pressure steel pipe is introduced into the other end of the pipe joint, and the cylinder sleeve is installed between the end cover and the supporting barrel in a pressing mode through a screw. The water pressure detection device can switch on a control system oil path for opening the pressure release valve when a plant loses power and the water pressure of the pressure steel pipe exceeds a limit value, timely switch on the pressure release valve to reduce the water pressure in the pressure steel pipe, prevent the pressure steel pipe from bursting, ensure the safe operation of a power station system, and avoid water and electricity accidents. The device can improve the precision of pressure detection by finely adjusting the compression amount of the compression spring.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of steel pipe water pressure detection, concretely is a kind of mechanical pressure steel pipe overpressure protection device. BACKGROUND

[0002] Mechanical pressure steel pipe overpressure protection device is the device used to monitor the water pressure in pressure steel pipe in hydropower station.Most of the water pressure detection device is generally electronic pressure transmitter, when power plant workshop suddenly loses power, electronic pressure transmitter cannot transmit the water pressure signal in pressure steel pipe to control system, once the water pressure in pressure steel pipe rises to exceed the upper limit value set by pressure monitoring at this time, control system cannot get pressure signal, cannot promptly open pressure relief valve to pressure pipeline pressure relief, it is possible to cause pressure steel pipe overpressure burst pipe, cause hydropower accident, for this, a kind of mechanical pressure steel pipe overpressure protection device is presented. SUMMARY

[0003] To solve the problems presented in the above background art, the utility model provides the following technical scheme: a kind of mechanical pressure steel pipe overpressure protection device, including water pressure balancing device, overpressure trigger device, the mounting seat of water pressure balancing device and overpressure trigger device is connected by screw thread;

[0004] The water pressure balancing device includes pipe joint, end cover, cylinder sleeve, piston, support cylinder, guide rod, compression spring, adjusting screw rod, the pipe joint is installed on end cover by screw thread, another end of pipe joint is introduced into the pressure water source of pressure steel pipe, the cylinder sleeve is installed between end cover and support cylinder by screw, the adjusting screw rod is connected in support cylinder, the piston is installed in cylinder sleeve and forms hydraulic cylinder, the one end of guide rod close to piston is fixed with baffle ring, and is equipped with round hole, and the thin rod of piston one end is inserted into the round hole of guide rod, the compression spring is arranged between baffle ring and adjusting screw rod, the guide rod passes through compression spring, adjusting screw rod in sequence, and is resisted on one side of overpressure trigger device;

[0005] The overpressure triggering device comprises a pawl, a mounting seat, a first side plate, a roller reversing valve, a second side plate, a roller reversing valve mounting plate, a cam, a handle, a top plate, an adjusting pad, a cam shaft, a self-lubricating bearing, a first torsional spring, a first torque adjusting gland, a first bottom plate, a second torque adjusting gland, a pawl shaft, a second torsional spring and a second bottom plate, the guide rod abuts against one side of the pawl, the mounting seat, the first side plate, the second side plate, the roller reversing valve mounting plate, the top plate, the first bottom plate and the second bottom plate are connected by screws into a hexahedral box, the first torque adjusting gland is connected to the mounting seat by a pin, the adjusting pad is connected to the mounting seat by a thread, the cam shaft passes through the first torque adjusting gland, the first torsional spring, the cam, the self-lubricating bearing, the adjusting pad and the top plate in sequence, the first torsional spring is inserted into the first torque adjusting gland and the cam hole at two ends respectively, the first torque adjusting gland can adjust the torsional torque of the first torsional spring, the cam is connected to the cam shaft by a key, the self-lubricating bearing is mounted in the mounting seat, the pawl shaft passes through the second torque adjusting gland, the second torsional spring and the pawl in sequence, the lower end is inserted into the mounting seat hole, the second torque adjusting gland is connected to the mounting seat by a pin, the second torsional spring is inserted into the second torque adjusting gland and the pawl hole at two ends respectively, the second torque adjusting gland can adjust the torsional torque of the second torsional spring, the roller reversing valve is mounted on the roller reversing valve mounting plate, the roller reversing valve push rod is in a compressed state by the cam, and the pawl is clamped on the cam shaft clamping groove.

[0006] Further, the adjusting screw is connected to the supporting cylinder by a thread.

[0007] Further, the water pressure balancing device further comprises a round nut, the round nut is connected to the adjusting screw by a thread, the compression amount of the compression spring can be adjusted by adjusting the screw thread length of the adjusting screw and the supporting cylinder, and the round nut is tightened after adjustment.

[0008] Further, a gasket is arranged between the compression spring and the adjusting screw.

[0009] Further, the gasket is mounted on the adjusting screw by a stop.

[0010] Further, the handle is connected to the cam shaft by a screw.

[0011] Compared with the prior art, the water pressure detection device has the advantages that:

[0012] 1. The water pressure detection device can connect the control system oil way of the pressure relief valve opening when the factory building loses power and the pressure of the pressure steel pipe exceeds the limited value, open the pressure relief valve in time to reduce the water pressure in the pressure steel pipe, prevent the pressure steel pipe from being exploded, ensure the safe operation of the power station system and avoid the occurrence of the water and electricity accident, and the device can improve the pressure detection precision by fine adjustment of the compression amount of the compression spring.

[0013] 2. The device has high measurement accuracy and fast response. BRIEF DESCRIPTION OF DRAWINGS

[0014] The accompanying drawings are included to provide a further understanding of the present application and are incorporated in and constitute a part of this specification, illustrate embodiments of the present application and serve to explain the present application and do not limit the present application. In the drawings:

[0015] Figure 1 is a structural schematic view of the present application;

[0016] Figure 2 is Figure 1 an A-A sectional view of the present application;

[0017] Figure 3 is Figure 1 a B-B sectional view of the present application;

[0018] Figure 4 is Figure 2 a C-C sectional view of the present application;

[0019] Figure 5 is Figure 2 an enlarged view of I in the present application;

[0020] Figure 6 is Figure 1 an enlarged view of II in the present application;

[0021] In the drawings: 1, water pressure balancing device; 2, overpressure triggering device; 3, pipe joint; 4, end cover; 5, cylinder sleeve; 6, piston; 7, support cylinder; 8, guide rod; 9, compression spring; 10, gasket; 11, round nut; 12, adjusting screw; 13, pawl; 14, mounting seat; 15, first side plate; 16, roller reversing valve; 17, second side plate; 18, roller reversing valve mounting plate; 19, cam; 20, handle; 21, top plate; 22, adjusting pad; 23, cam shaft; 24, self-lubricating bearing; 25, first torsional spring; 26, first torque adjusting gland; 27, first bottom plate; 28, second torque adjusting gland; 29, pawl shaft; 30, second torsional spring; 31, second bottom plate. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0023] The present application is Figures 1-6The utility model provides a kind of mechanical pressure steel pipe overpressure protection device, including water pressure balancing device 1, overpressure trigger device 2, water pressure balancing device 1 is connected with the mounting seat 14 of overpressure trigger device 2 by thread;

[0024] Water pressure balancing device 1 includes pipe joint 3, end cover 4, cylinder sleeve 5, piston 6, support cylinder 7, guide rod 8, compression spring 9, adjusting screw rod 12, pipe joint 3 is installed on end cover 4 by thread, the other end of pipe joint 3 is introduced into the pressure water source of pressure steel pipe, cylinder sleeve 5 is installed between end cover 4 and support cylinder 7 by screw compression, adjusting screw rod 12 is connected in support cylinder 7, piston 6 is installed in cylinder sleeve 5 and forms hydraulic water cylinder, the end of guide rod 8 close to piston 6 is fixed with baffle ring, and is equipped with round hole, the thin rod of one end of piston 6 is inserted into the round hole of guide rod 8, compression spring 9 is arranged between baffle ring and adjusting screw rod 12, guide rod 8 passes through compression spring 9, adjusting screw rod 12 in proper order, and is resisted on one side of overpressure trigger device 2;

[0025] Overpressure trigger device 2 includes pawl 13, mounting seat 14, first side plate 15, roller reversing valve 16, second side plate 17, roller reversing valve mounting plate 18, cam 19, handle 20, top plate 21, adjusting pad 22, cam shaft 23, self-lubricating bearing 24, first torsional spring 25, first torque adjusting gland 26, first bottom plate 27, second torque adjusting gland 28, pawl shaft 29, second torsional spring 30, second bottom plate 31, guide rod 8 is resisted on one side of pawl 13, mounting seat 14, first side plate 15, second side plate 17, roller reversing valve mounting plate 18, top plate 21, first bottom plate 27, second bottom plate 31 are connected by screw and are hexahedron box, first torque adjusting gland 26 is connected on mounting seat 14 by pin, adjusting pad 22 is connected on mounting seat 14 by thread, cam shaft 23 passes through first torque adjusting gland 26, first torsional spring 25, cam 19, self-lubricating bearing 24, adjusting pad 22 and top plate 21 in proper order, the both ends of first torsional spring 25 are inserted into the hole of first torque adjusting gland 26 and cam 19 respectively, first torque adjusting gland 26 can adjust the torsional moment of first torsional spring 25, cam 19 is connected with cam shaft 23 by key, self-lubricating bearing 24 is installed in mounting seat 14, pawl shaft 29 passes through second torque adjusting gland 28, second torsional spring 30, pawl 13 in proper order, lower end is inserted into the hole of mounting seat 14, second torque adjusting gland 28 is connected on mounting seat 14 by pin, the both ends of second torsional spring 30 are inserted into the hole of second torque adjusting gland 28 and pawl 13 respectively, second torque adjusting gland 28 can adjust the torsional moment of second torsional spring 30, roller reversing valve 16 is installed on roller reversing valve mounting plate 18, the push rod of roller reversing valve 16 is in the compression state of cam 19, pawl 13 is clamped on the card slot of cam shaft 23.

[0026] The adjusting screw 12 is screwed in the supporting cylinder 7, and the compression amount of the compression spring 9 can be adjusted by adjusting the screwing length of the adjusting screw 12 and the supporting cylinder 7, so as to improve the accuracy of pressure detection.

[0027] The water pressure balancing device 1 further comprises a round nut 11, which is screwed on the adjusting screw 12, and the compression amount of the compression spring 9 can be adjusted by adjusting the screwing length of the adjusting screw 12 and the supporting cylinder 7, and the round nut 11 is tightened after adjustment.

[0028] A gasket 10 is arranged between the compression spring 9 and the adjusting screw 12.

[0029] The gasket 10 is mounted on the adjusting screw 12 through a necking.

[0030] The handle 20 is screwed on the cam shaft 23.

[0031] Working principle: the pipe joint 3 of the water pressure balancing device 1 is connected to the pressure water in the pressure steel pipe, and when the power station is in normal operation state, the water pressure is less than the pressure limit value of the pressure steel pipe, the hydraulic thrust of the water pressure acting on the piston 6 is less than the elastic force of the compression spring 9, the water pressure is insufficient to push the piston 6 and the guide rod 8 to further extend outwards of the adjusting screw 12, and the overpressure triggering device 2 will not be triggered.

[0032] When the water pressure exceeds the pressure limit value of the pressure steel pipe of the power station, the hydraulic thrust of the water pressure acting on the piston 6 is greater than the elastic force of the compression spring 9, the water pressure pushes the piston 6 and the guide rod 8 to slightly extend outwards of the adjusting screw 12, the guide rod 8 pushes the pawl 13 to rotate counterclockwise along the pawl shaft 29, the pawl 13 is detached from the clamping groove of the cam shaft 23, the rotation limit of the cam shaft 23 is released, the cam 19 rotates counterclockwise along the cam shaft 23 under the torsional force of the first torsional spring 25, the cam 19 and the push rod of the roller reversing valve 16 are separated, the push rod of the roller reversing valve 16 is extended under the compression, the pressure relief valve opening control oil way is connected, the pressure relief valve is opened, the water pressure in the pressure steel pipe is released, and the water power safety accident is prevented. The compression amount of the compression spring 9 can be adjusted by adjusting the screwing length of the adjusting screw 12 and the supporting cylinder 7, so as to improve the accuracy of pressure detection.

[0033] Resetting process: when the pressure of the pressure steel pipe is released, the water pressure returns to the normal level, and the piston 6 and the guide rod 8 will retract to the balanced position state. The handle 20 is manually rotated clockwise along the cam shaft 23 by a certain angle, the cam 19 rotates following the handle 20, the cam 19 compresses the push rod of the roller reversing valve 16, the valve opening control oil way of the roller reversing valve 16 is cut off, the pawl 13 rotates clockwise under the torsional force of the second torsional spring 30 and is clamped in the clamping groove of the cam shaft 23, the counterclockwise rotation of the cam shaft 23 is limited, and the water pressure detection device is reset.

[0034] It is to be noted that, in the present document, relational terms such as first and second and the like can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0035] While the embodiments of the present application have been illustrated and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and alterations can be made therein without departing from the spirit and scope of the application, which is defined by the appended claims and their equivalents.

Claims

1. A mechanical overpressure protection device for a steel pressure pipe, characterized in that The water pressure balancing device (1) and the mounting base (14) of the overpressure triggering device (2) are connected by screw thread; The water pressure balancing device (1) comprises a pipe joint (3), an end cover (4), a cylinder sleeve (5), a piston (6), a supporting cylinder (7), a guide rod (8), a compression spring (9) and an adjusting screw rod (12), the pipe joint (3) is installed on the end cover (4) by screw thread, the other end of the pipe joint (3) is introduced into the pressure water source of the pressure steel pipe, the cylinder sleeve (5) is tightly installed between the end cover (4) and the supporting cylinder (7) by screw, the adjusting screw rod (12) is connected in the supporting cylinder (7), the piston (6) is installed in the cylinder sleeve (5) to form a hydraulic cylinder, the one end of the guide rod (8) close to the piston (6) is fixed with a check ring and is provided with a round hole, the one end thin rod of the piston (6) is inserted into the round hole of the guide rod (8), the compression spring (9) is arranged between the check ring and the adjusting screw rod (12), the guide rod (8) passes through the compression spring (9) and the adjusting screw rod (12) in sequence and abuts against one side of the overpressure triggering device (2). The overpressure trigger device (2) comprises a pawl (13), a mounting seat (14), a first side plate (15), a roller reversing valve (16), a second side plate (17), a roller reversing valve mounting plate (18), a cam (19), a handle (20), a top plate (21), an adjusting pad (22), a cam shaft (23), a self-lubricating bearing (24), a first torsional spring (25), a first torque adjusting gland (26), a first bottom plate (27), a second torque adjusting gland (28), a pawl shaft (29), a second torsional spring (30), and a second bottom plate (31). The guide rod (8) is located on one side of the pawl (13). The mounting seat (14), the first side plate (15), the second side plate (17), the roller reversing valve mounting plate (18), the top plate (21), the first bottom plate (27), and the second bottom plate (31) are connected by screws into a hexahedral box. The first torque adjusting gland (26) is connected to the mounting seat (14) by a pin. The adjusting pad (22) is connected to the mounting seat (14) by a thread. The cam shaft (23) passes through the first torque adjusting gland (26), the first torsional spring (25), the cam (19), the self-lubricating bearing (24), the adjusting pad (22), and the top plate (21) in sequence. The first torsional spring (25) is inserted into the holes of the first torque adjusting gland (26) and the cam (19) at both ends. The first torque adjusting gland (26) can adjust the torsional moment of the first torsional spring (25). The cam (19) is connected to the cam shaft (23) by a key. The self-lubricating bearing (24) is installed in the mounting seat (14). The pawl shaft (29) passes through the second torque adjusting gland (28), the second torsional spring (30), and the pawl (13) in sequence. The lower end is inserted into the hole of the mounting seat (14). The second torque adjusting gland (28) is connected to the mounting seat (14) by a pin. The second torsional spring (30) is inserted into the holes of the second torque adjusting gland (28) and the pawl (13) at both ends. The second torque adjusting gland (28) can adjust the torsional moment of the second torsional spring (30). The roller reversing valve (16) is installed on the roller reversing valve mounting plate (18). The push rod of the roller reversing valve (16) is in a compressed state by the cam (19). The pawl (13) is clamped on the cam slot of the cam shaft (23).

2. A mechanical overpressure protection device for a pressure steel pipe according to claim 1, characterized in that: The adjusting screw (12) is connected to the support cylinder (7) by a thread.

3. A mechanical pressure tube overpressure protection device according to claim 2, characterized in that: The water pressure balancing device (1) further comprises a round nut (11) connected to the adjusting screw (12) by a thread. The compression amount of the compression spring (9) can be adjusted by adjusting the screwing length of the adjusting screw (12) and the support cylinder (7). After adjustment, the round nut (11) is tightened to prevent loosening.

4. The mechanical pressure steel pipe overpressure protection device according to claim 1, characterized in that: A washer (10) is arranged between the compression spring (9) and the adjusting screw (12).

5. A mechanical pressure tube overpressure protection device according to claim 4, characterized in that: The washer (10) is installed on the adjusting screw (12) by a stop.

6. A mechanical pressure steel pipe overpressure protection device according to claim 1, characterized in that: The handle (20) is connected to the cam shaft (23) by a screw.

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