Low-temperature pressure release valve for offshore oil drilling

Abstract

The invention discloses a low-temperature pressure release valve for offshore oil drilling, and relates to the field of pressure release valves, the low-temperature pressure release valve comprises a pressure release valve main body, the top end of the pressure release valve main body is provided with a valve cover, the left side of the pressure release valve main body is connected with a water inlet pipe, the right side of the pressure release valve main body is connected with a water outlet pipe, and the pressure release valve main body is internally provided with a cleaning structure. The flow meter, the motor, the rotating rod and the pushing plate are arranged, the flow meter on the inner wall of the connecting pipe is used for detecting the flow speed of flowing petroleum, when the flow speed is obviously reduced, an air cylinder in the rotating rod is controlled to operate, and the air cylinder drives a clamping block to stretch out and be inserted into a clamping groove in the inner wall of a rotating sleeve, so that the rotating sleeve and the rotating rod are fixed; and at the moment, a motor can be controlled to operate, the rotating rod, the rotating sleeve and the pushing plates at the output end are driven to rotate, when the two sets of pushing plates rotate rapidly, petroleum is pushed to move rightwards, the flow speed of the petroleum is increased, and the problem of petroleum blockage is solved.

Description

Technical Field

[0001] The invention relates to the field of pressure relief valves, in particular to a low-temperature pressure relief valve used for offshore oil drilling. Background Art

[0002] Marine oil is oil distributed in the bedrock of the seabed. Offshore oil drilling is a drilling project carried out in the continental shelf sea area for the purpose of surveying and exploring seabed oil and natural gas. The drilling depth is generally several thousand meters. The oil collected by drilling is transported through pipelines. In order to ensure the smooth transportation of oil, a pressure relief valve is generally installed on the pipeline. The pressure relief valve is composed of a needle valve, a pressure gauge, a main valve, a pilot valve and a connecting pipe. It is a kind of hydraulic control valve. The main valve is divided into upper and lower parts by the diaphragm. The lower cavity of the diaphragm is a water flow channel, and the upper cavity is a control chamber, which controls the opening and closing of the main valve disc. The pilot valve itself is a pressure relief valve. It also has a control chamber and a water flow channel. The opening and closing of the valve disc is controlled by the control chamber. The needle valve is a throttle valve, which controls the flow of water in the connecting pipe.

[0003] The existing pressure relief valve used in offshore oil drilling has connecting pipes on both sides. Due to the viscous texture of oil, it is easy to get blocked in the connecting pipes, and the blockage cannot be handled in time, resulting in stagnation of oil transportation. Therefore, there is an urgent need for a low-temperature pressure relief valve for offshore oil drilling. Summary of the invention

[0004] The purpose of the present invention is to solve the problem that the existing pressure relief valve used in offshore oil drilling has connecting pipes connected on both sides of the pressure relief valve. Due to the viscous texture of oil, blockage is easy to occur in the connecting pipe, and the blockage cannot be handled in time, resulting in stagnation of oil transportation. After the oil is transported, a large amount of oil is attached to the inner wall of the pressure relief valve. Affected by the temperature, the oil dries up in the pressure relief valve, which cannot be cleaned and the pressure of the guide valve needs to be adjusted by a threaded rod, but the threaded rod is exposed to the air and is easily affected by moisture and rusted, thereby affecting the use. A low-temperature pressure relief valve for offshore oil drilling is provided.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a low-temperature pressure relief valve for offshore oil drilling, comprising a pressure relief valve body, a valve cover is arranged at the top of the pressure relief valve body, a water inlet pipe is connected to the left side of the pressure relief valve body, a water outlet pipe is connected to the right side of the pressure relief valve body, a cleaning structure is arranged inside the pressure relief valve body, a valve seat is arranged on the inner wall of the pressure relief valve body, a pilot valve housing is arranged at the top of the valve cover, a pushing structure is arranged on the left side of the water inlet pipe, and two ends of the pilot valve housing are provided. A copper tube is arranged on the side, a needle valve is installed on the copper tube, a pressure gauge is installed above the needle valve, a main valve core is clamped on the inner side of the valve seat, a valve stem is fixed inside the main valve core, and a main valve diaphragm is arranged above the main valve core, a threaded rod is arranged on the inner side of the pilot valve housing, and a protective structure is arranged on the outer side of the pilot valve housing, a nut is sleeved on the outer wall of the threaded rod, and a spring is connected to the bottom end of the threaded rod, a pilot valve core is arranged at the bottom end of the spring, and a pilot valve diaphragm is arranged on the outer side of the pilot valve core.

[0006] The pushing structure includes a connecting pipe, flanges are provided at both ends of the connecting pipe, a flow meter is installed on the inner wall of the connecting pipe, a motor is installed on the outer side of the connecting pipe, a rotating rod is provided at the output end of the motor, a bearing is provided on the outer wall of the rotating rod, and a rotating sleeve is provided on the outer side of the rotating rod, a cylinder is installed inside the rotating rod, a block is provided at the output end of the cylinder, a slot is opened on the inner wall of the rotating sleeve, and a pushing plate is connected to the outer wall of the rotating sleeve.

[0007] The cleaning structure includes a first heating tube, a power base is installed at the end of the first heating tube, the bottom end of the pressure relief valve body is connected to the first discharge pipe, vibration motors are installed on both sides of the first discharge pipe, and a sealing cover is provided at the end of the first discharge pipe, a second heating tube is provided above the first heating tube, a second discharge pipe is provided at the bottom end of the water outlet pipe, a third heating tube is provided above the second heating tube, and a third discharge pipe is provided on the right side of the third heating tube.

[0008] The protective structure comprises a magnetic ring, a counterweight ring is attached to the top of the magnetic ring, a folding cover is connected to the top of the counterweight ring, a fixing plate is arranged on the top of the folding cover, and a compression rod is fixed to the inner wall of the fixing plate.

[0009] Preferably, the valve stem is movably connected to the valve cover via a limit position, the main valve diaphragm is fixedly connected to the valve cover, the main valve core is snap-connected to the valve seat, and the pilot valve housing is fixedly connected to the valve cover via a connecting sleeve.

[0010] Preferably, the connecting pipe is fixedly connected to the water inlet pipe via a flange and bolts, and the flow meter is fixedly connected to the connecting pipe via a mounting seat.

[0011] Preferably, the number of the motors is two, the two motors and the connecting pipe are fixedly installed via a mounting frame, and the rotating sleeve is rotatably connected to the rotating rod via a bearing.

[0012] Preferably, the rotating sleeve and the rotating rod are fixed by clamping through a cylinder, a clamping block and a pushing plate, and the clamping block is clamped and connected with the clamping slot.

[0013] Preferably, the ends of the first heating tube, the second heating tube and the third heating tube are all installed with power bases, and the ends of the first discharge tube, the second heating tube and the third discharge tube are all sleeved with sealing covers.

[0014] Preferably, there are two vibration motors, and the vibration motor and the pressure relief valve body are fixedly installed by bolts.

[0015] Preferably, the threaded rod is movably connected to the pilot valve housing and the nut via bolts, and the two ends of the spring are fixedly connected to the threaded rod and the pilot valve core respectively.

[0016] Preferably, the fixing plate is fixed to the threaded rod by magnetism, the folding cover is fixed to the guide valve housing by adsorption through a weight ring and a magnetic ring, and the number of the anti-compression rods is four.

[0017] Compared with the prior art, the present invention has the following beneficial effects: First, the present invention detects the flow rate of the flowing oil by setting a flow meter, a motor, a rotating rod and a pushing plate. The flow meter on the inner wall of the connecting pipe detects the flow rate of the flowing oil. When the flow rate is significantly reduced, the cylinder inside the rotating rod is controlled to operate, and the cylinder drives the card block to extend and insert into the card groove on the inner wall of the rotating sleeve, so that the rotating sleeve and the rotating rod are fixed, and then the pushing plate and the rotating rod are fixed. At this time, the motor can be controlled to operate to drive the rotating rod, the rotating sleeve and the pushing plate at the output end to rotate. When the two groups of pushing plates rotate rapidly, the oil is pushed to the right side, increasing the flow rate of the oil and solving the problem of oil blockage.

[0018] Second, the present invention sets a first heating tube, a second heating tube, a third heating tube, a first discharge tube, a second discharge tube and a third discharge tube. After the pressure relief valve body stops conveying oil, the first heating tube, the second heating tube and the third heating tube are controlled to operate, and the power base provides electric energy for them. After the first heating tube, the second heating tube and the third heating tube are operated, the lower cavity, the middle cavity and the upper cavity of the pressure relief valve are heated respectively. After heating and temperature rise, the oil attached to the lower cavity, the middle cavity and the upper cavity of the pressure relief valve begins to fall off, and the vibration motor at the bottom end of the pressure relief valve body operates to generate vibration force, which is transmitted to the pressure relief valve body to accelerate the shedding of the oil in the lower cavity, the middle cavity and the upper cavity of the pressure relief valve. At this time, the sealing covers at the ends of the first discharge tube, the second discharge tube and the third discharge tube are unscrewed, and the fallen oil flows out through the first discharge tube, the second discharge tube and the third discharge tube respectively, so that the interior of the pressure relief valve body is cleaned.

[0019] Third, the present invention sets the main valve opening pressure by setting a folding cover, a fixing plate, a pressure-resistant rod, a magnetic ring and a counterweight ring. The nut is loosened, and the adjusting threaded rod is turned clockwise to move downward. At this time, the main valve opening pressure increases. If it is turned counterclockwise, the threaded rod moves upward, the main valve is closed, and the pressure decreases. After adjustment, the nut is tightened to fix the threaded rod. Then, the folding cover is put on the outside of the pilot valve housing, and the fixing plate at the top of the folding cover is fixed to the threaded rod by magnetic attraction. At the same time, the four pressure-resistant rods at the bottom end of the fixing plate are set on the outside of the pilot valve housing to realize the protection function. Then, after the counterweight ring at the bottom end of the folding cover moves downward, it is adsorbed and fixed to the magnetic ring on the outer wall of the pilot valve housing, so that the folding cover is fixed to the outside of the pilot valve housing, and the pilot valve housing, the threaded rod and the nut are waterproofed. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the front cross-section structure of the present invention; Figure 3 It is a schematic diagram of the push structure of the present invention; Figure 4 It is a schematic diagram of a push plate of the present invention; Figure 5 For the present invention Figure 4 A is an enlarged schematic diagram; Figure 6 It is a schematic diagram of the cleaning structure of the present invention; Figure 7 It is a schematic diagram of the power base of the present invention; Figure 8 It is a schematic diagram of the protection structure of the present invention; Fig. 9 It is a schematic diagram of the folding cover of the present invention.

[0021] In the figure: 1. Pressure relief valve body; 2. Valve cover; 3. Valve stem; 4. Main valve diaphragm; 5. Main valve core; 6. Water inlet pipe; 7. Water outlet pipe; 8. Pushing structure; 801. Connecting pipe; 802. Flange; 803. Flow meter; 804. Motor; 805. Rotating rod; 806. Bearing; 807. Rotating sleeve; 808. Cylinder; 809. Block; 810. Slot; 811. Pushing plate; 9. Cleaning structure; 901. First heating tube; 902. First outlet pipe; 903. Sealing cover; 904. The second heating tube; 905, the second discharge tube; 906, the third heating tube; 907, the third discharge tube; 908, the power base; 909, the vibration motor; 10, the valve seat; 11, the copper tube; 12, the needle valve; 13, the pressure gauge; 14, the pilot valve housing; 15, the threaded rod; 16, the nut; 17, the spring; 18, the pilot valve core; 19, the pilot valve diaphragm; 20, the protective structure; 2001, the magnetic ring; 2002, the counterweight ring; 2003, the folding cover; 2004, the fixing plate; 2005, the pressure-resistant rod. DETAILED DESCRIPTION

[0022] 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.

[0023] See also Figure 1-5A low-temperature pressure relief valve for offshore oil drilling comprises a pressure relief valve body 1, a valve cover 2 is arranged at the top of the pressure relief valve body 1, and a water inlet pipe 6 is connected to the left side of the pressure relief valve body 1, a water outlet pipe 7 is connected to the right side of the pressure relief valve body 1, and a cleaning structure 9 is arranged inside the pressure relief valve body 1, a valve seat 10 is arranged on the inner wall of the pressure relief valve body 1, a pilot valve housing 14 is arranged at the top of the valve cover 2, a pushing structure 8 is arranged on the left side of the water inlet pipe 6, copper tubes 11 are arranged on both sides of the pilot valve housing 14, a needle valve 12 is installed on the copper tube 11, a pressure gauge 13 is installed above the needle valve 12, a main valve core 5 is clamped on the inner side of the valve seat 10, a valve stem 3 is fixed inside the main valve core 5, a main valve diaphragm 4 is arranged above the main valve core 5, and the inner wall of the pilot valve housing 14 is provided with a valve seat 10, a pilot valve housing 14 is arranged at the top of the valve cover 2, a pushing structure 8 is arranged on the left side of the water inlet pipe 6, copper tubes 11 are arranged on both sides of the pilot valve housing 14, a needle valve 12 is installed on the copper tube 11, a pressure gauge 13 is installed above the needle valve 12, a main valve core 5 is clamped on the inner side of the valve seat 10, a valve stem 3 is fixed inside the main valve core 5, a main valve diaphragm 4 is arranged above the main valve core 5, and a valve seat 10 is arranged inside the pilot valve housing 14. A threaded rod 15 is arranged on the side, and a protective structure 20 is arranged on the outer side of the pilot valve housing 14, a nut 16 is sleeved on the outer wall of the threaded rod 15, and a spring 17 is connected to the bottom end of the threaded rod 15, a pilot valve core 18 is arranged on the bottom end of the spring 17, and a pilot valve diaphragm 19 is arranged on the outer side of the pilot valve core 18, the pushing structure 8 includes a connecting pipe 801, flanges 802 are arranged at both ends of the connecting pipe 801, and a flow meter 803 is installed on the inner wall of the connecting pipe 801, a motor 804 is installed on the outer side of the connecting pipe 801, a rotating rod 805 is arranged on the output end of the motor 804, a bearing 806 is arranged on the outer wall of the rotating rod 805, and a rotating sleeve 807 is arranged on the outer side of the rotating rod 805, and a cylinder 808 is installed inside the rotating rod 805, and the cylinder 808 The output end is provided with a block 809, the inner wall of the rotating sleeve 807 is provided with a slot 810, and the outer wall of the rotating sleeve 807 is connected with a push plate 811, the valve stem 3 is connected to the valve cover 2 through a limit movably connected, the main valve diaphragm 4 is fixedly connected to the valve cover 2, the main valve core 5 is connected by engagement with the valve seat 10, the pilot valve housing 14 is fixedly connected to the valve cover 2 through a connecting sleeve, the connecting pipe 801 is fixedly connected to the water inlet pipe 6 through a flange 802 and bolts, the flow meter 803 is fixedly connected to the connecting pipe 801 through a mounting seat, the number of motors 804 is two, the two motors 804 are fixedly installed with the connecting pipe 801 through a mounting frame, the rotating sleeve 807 is rotatably connected to the rotating rod 805 through a bearing 806, and the rotating sleeve 807 and the rotating rod 805 are connected by a cylinder 808, the block 809 and the push plate 811 are engaged and fixed, the block 809 is engaged and connected with the slot 810, the connecting pipe 801 is connected to the water inlet pipe 6 through the flange 802, the oil passes through the connecting pipe 801, and drives the two sets of push plates 811 and the rotating sleeve 807 to rotate, thereby entering the pressure relief valve body 1, the flow meter 803 on the inner wall of the connecting pipe 801 detects the flow rate of the flowing oil, when the flow rate is significantly reduced, the cylinder 808 inside the rotating rod 805 is controlled to operate, after the cylinder 808 operates, the block 809 at the output end is extended and inserted into the slot 810 on the inner wall of the rotating sleeve 807, so that the rotating sleeve 807 and the rotating rod 805 are fixed, and then the push plate 811 and the rotating rod 805 are fixed,At this time, the motor 804 can be controlled to run. The internal technology of the motor 804 is the existing technology. After the motor 804 runs, it drives the rotating rod 805, the rotating sleeve 807 and the push plate 811 at the output end to rotate. When the two sets of push plates 811 rotate quickly, the oil is pushed to the right, increasing the flow rate of the oil and solving the problem of oil blockage.

[0024] See also Figure 6-7 A low-temperature pressure relief valve for offshore oil drilling, wherein the cleaning structure 9 comprises a first heating tube 901, a power base 908 is installed at the end of the first heating tube 901, a first discharge tube 902 is connected to the bottom end of the pressure relief valve body 1, vibration motors 909 are installed on both sides of the first discharge tube 902, and a sealing cover 903 is provided at the end of the first discharge tube 902, a second heating tube 904 is provided above the first heating tube 901, and a second discharge tube 904 is provided at the bottom end of the water outlet pipe 7. The material pipe 905, the third heating pipe 906 is arranged above the second heating pipe 904, and the third discharge pipe 907 is arranged on the right side of the third heating pipe 906. The ends of the first heating pipe 901, the second heating pipe 904 and the third heating pipe 906 are all installed with a power base 908. The ends of the first discharge pipe 902, the second heating pipe 904 and the third discharge pipe 907 are all sleeved with a sealing cover 903. There are two vibration motors 909, and the vibration motor 909 is fixedly installed with the pressure relief valve body 1 by bolts. After the pressure relief valve body 1 stops conveying oil, the first heating pipe 901, the second heating pipe 904 and the third heating pipe 906 are controlled to operate, and the power base 908 provides electric energy for them. After the first heating pipe 901, the second heating pipe 904 and the third heating pipe 906 are operated, the lower cavity, the middle cavity and the upper cavity of the pressure relief valve are heated respectively. After heating and heating, the oil attached to the lower cavity, the middle cavity and the upper cavity of the pressure relief valve begins to fall off. The vibration motor 909 at the bottom end of the pressure relief valve body 1 runs to generate vibration force, which is transmitted to the pressure relief valve body 1, accelerating the shedding of oil in the lower cavity, middle cavity and upper cavity of the pressure relief valve. At this time, the sealing covers 903 at the ends of the first discharge pipe 902, the second discharge pipe 905 and the third discharge pipe 907 are unscrewed, and the shedding oil flows out through the first discharge pipe 902, the second discharge pipe 905 and the third discharge pipe 907 respectively, so that the interior of the pressure relief valve body 1 is cleaned.

[0025] See also Figure 8-9, a low-temperature pressure relief valve for offshore oil drilling, the protective structure 20 includes a magnetic ring 2001, a counterweight ring 2002 is attached to the top of the magnetic ring 2001, a folding cover 2003 is connected to the top of the counterweight ring 2002, a fixing plate 2004 is arranged at the top of the folding cover 2003, a pressure-resistant rod 2005 is fixed to the inner wall of the fixing plate 2004, a threaded rod 15 is movably connected to the pilot valve housing 14 and a nut 16 by bolts, two ends of a spring 17 are respectively fixedly connected to the threaded rod 15 and a pilot valve core 18, the fixing plate 2004 is fixedly fixed to the threaded rod 15 by magnetic attraction, the folding cover 2003 is fixedly fixed to the pilot valve housing 14 by the counterweight ring 2002 and the magnetic ring 2001, the number of the pressure-resistant rods 2005 is four, firstly set the main valve opening pressure, loosen the nut 16, turn clockwise The threaded rod 15 is adjusted dynamically and moves downward. At this time, the opening pressure of the main valve increases. If it is turned counterclockwise, the threaded rod 15 moves up, the main valve is closed, and the pressure is reduced. After adjustment, the nut 16 is tightened to fix the threaded rod 15, and then the folding cover 2003 is put on the outside of the pilot valve housing 14, and the fixing plate 2004 at the top of the folding cover 2003 is magnetically fixed to the threaded rod 15. At the same time, the four pressure-resistant rods 2005 at the bottom end of the fixing plate 2004 are arranged on the outside of the pilot valve housing 14 to achieve a protective function. Then, the counterweight ring 2002 at the bottom end of the folding cover 2003 moves downward and is fixed to the magnetic ring 2001 on the outer wall of the pilot valve housing 14 by adsorption, so that the folding cover 2003 is fixed to the outside of the pilot valve housing 14, and the pilot valve housing 14, the threaded rod 15 and the nut 16 are waterproofed.

[0026] Working principle: When the present invention is used, first set the main valve opening pressure, loosen the nut 16, turn the adjustment threaded rod 15 clockwise, and the threaded rod 15 moves downward. At this time, the main valve opening pressure increases, and it is screwed counterclockwise, so that the threaded rod 15 moves up, the main valve is closed, and the pressure decreases. After adjustment, tighten the nut 16 to fix the threaded rod 15, and then put the folding cover 2003 on the outside of the pilot valve housing 14, and the fixing plate 2004 at the top of the folding cover 2003 is magnetically fixed to the threaded rod 15. At the same time, the four pressure-resistant rods 2005 at the bottom end of the fixing plate 2004 are set on the outside of the pilot valve housing 14 to achieve a protective function. Then, after the counterweight ring 2002 at the bottom end of the folding cover 2003 moves downward, it is attracted by the magnetic attraction ring 2001 on the outer wall of the pilot valve housing 14. The folding cover 2003 is fixed to the outside of the pilot valve housing 14, and the pilot valve housing 14, the threaded rod 15 and the nut 16 are waterproofed. The connecting pipe 801 is connected to the water inlet pipe 6 through the flange 802. The oil passes through the connecting pipe 801 and drives the two sets of pushing plates 811 and the rotating sleeve 807 to rotate, thereby entering the pressure relief valve body 1. The flow meter 803 on the inner wall of the connecting pipe 801 detects the flow rate of the flowing oil. When the flow rate is significantly reduced, the cylinder 808 inside the rotating rod 805 is controlled to operate. After the cylinder 808 operates, the block 809 at the output end is extended and inserted into the groove 810 on the inner wall of the rotating sleeve 807, so that the rotating sleeve 807 and the rotating rod 805 are fixed, thereby making The push plate 811 and the rotating rod 805 are fixed, and the motor 804 can be controlled to run at this time. The internal technology of the motor 804 is the existing technology. After the motor 804 runs, it drives the rotating rod 805, the rotating sleeve 807 and the push plate 811 at the output end to rotate. When the two sets of push plates 811 rotate rapidly, the oil is pushed to the right to increase the flow rate of the oil and solve the problem of oil blockage. When the pressure in the lower cavity of the main valve increases abnormally, the pressure in the upper cavity increases accordingly. At this moment, the pressure in the upper cavity of the pilot valve remains unchanged, and the lower cavity of the pilot valve core 18 is connected to the upper cavity of the main valve. As the pressure in the upper cavity of the main valve rises, the pilot valve core 18 and the pilot valve diaphragm 19 will move up accordingly. At this moment, the pilot valve is opened. After the pilot valve is opened, the oil in the upper cavity of the main valve will be discharged quickly, and the pressure in the upper cavity will also drop rapidly. Similarly, the main The pressure in the lower chamber of the valve is significantly higher than that in the upper chamber of the main valve. The main valve opens and starts to discharge oil to relieve pressure. When the pressure in the pipeline in front of the valve drops to the set value, the upper and lower pressures of the pilot valve core 18 tend to be balanced, and the pilot valve chamber gradually closes. The pressure in the upper chamber of the main valve diaphragm 4 gradually increases. Since the area of ​​the main valve diaphragm 4 is larger than that of the main valve core 5, the main valve core 5 is closed under the action of the pressure difference, and the main valve stops relieving pressure. After the pressure relief valve body 1 stops delivering oil, the first heating tube 901, the second heating tube 904 and the third heating tube 906 are controlled to operate, and the power base 908 provides them with electrical energy. After the first heating tube 901, the second heating tube 904 and the third heating tube 906 are operated, the lower chamber, the middle chamber and the upper chamber of the pressure relief valve are heated respectively. After heating and heating,The oil adhering to the lower cavity, middle cavity and upper cavity of the pressure relief valve begins to fall off, and the vibration motor 909 at the bottom of the pressure relief valve body 1 runs to generate vibration force, which is transmitted to the pressure relief valve body 1, accelerating the falling of the oil in the lower cavity, middle cavity and upper cavity of the pressure relief valve. At this time, the sealing caps 903 at the ends of the first discharge pipe 902, the second discharge pipe 905 and the third discharge pipe 907 are unscrewed, and the falling oil flows out through the first discharge pipe 902, the second discharge pipe 905 and the third discharge pipe 907 respectively, so that the interior of the pressure relief valve body 1 is cleaned.

[0027] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A low temperature pressure relief valve for offshore oil drilling, comprising a pressure relief valve body (1), characterized in that: A valve cover (2) is provided at the top of the pressure relief valve body (1), and a water inlet pipe (6) is connected to the left side of the pressure relief valve body (1), a water outlet pipe (7) is connected to the right side of the pressure relief valve body (1), and a cleaning structure (9) is provided inside the pressure relief valve body (1), a valve seat (10) is provided on the inner wall of the pressure relief valve body (1), a pilot valve housing (14) is provided at the top of the valve cover (2), a pushing structure (8) is provided on the left side of the water inlet pipe (6), copper tubes (11) are provided on both sides of the pilot valve housing (14), a needle valve (12) is installed on the copper tube (11), and the upper end of the needle valve (12) is provided with a push structure (8). A pressure gauge (13) is installed on the side, a main valve core (5) is clamped on the inner side of the valve seat (10), a valve stem (3) is fixed inside the main valve core (5), and a main valve diaphragm (4) is arranged above the main valve core (5), a threaded rod (15) is arranged on the inner side of the pilot valve housing (14), and a protective structure (20) is arranged on the outer side of the pilot valve housing (14), a nut (16) is sleeved on the outer wall of the threaded rod (15), and a spring (17) is connected to the bottom end of the threaded rod (15), a pilot valve core (18) is arranged at the bottom end of the spring (17), and a pilot valve diaphragm (19) is arranged on the outer side of the pilot valve core (18); The pushing structure (8) comprises a connecting pipe (801), flanges (802) are provided at both ends of the connecting pipe (801), a flow meter (803) is installed on the inner wall of the connecting pipe (801), a motor (804) is installed on the outer side of the connecting pipe (801), a rotating rod (805) is provided at the output end of the motor (804), a bearing (806) is provided on the outer wall of the rotating rod (805), a rotating sleeve (807) is provided on the outer side of the rotating rod (805), a cylinder (808) is installed inside the rotating rod (805), a clamping block (809) is provided at the output end of the cylinder (808), a clamping groove (810) is provided on the inner wall of the rotating sleeve (807), and a pushing plate (811) is connected to the outer wall of the rotating sleeve (807); The cleaning structure (9) comprises a first heating tube (901), a power base (908) is installed at the end of the first heating tube (901), a first discharge tube (902) is connected to the bottom end of the pressure relief valve body (1), vibration motors (909) are installed on both sides of the first discharge tube (902), and a sealing cover (903) is provided at the end of the first discharge tube (902), a second heating tube (904) is provided above the first heating tube (901), a second discharge tube (905) is provided at the bottom end of the water outlet pipe (7), a third heating tube (906) is provided above the second heating tube (904), and a third discharge tube (907) is provided on the right side of the third heating tube (906); The protective structure (20) comprises a magnetic ring (2001), a counterweight ring (2002) is attached to the top of the magnetic ring (2001), a folding cover (2003) is connected to the top of the counterweight ring (2002), a fixing plate (2004) is arranged at the top of the folding cover (2003), and a compression rod (2005) is fixed to the inner wall of the fixing plate (2004).

2. A cryogenic pressure relief valve for offshore oil drilling according to claim 1, characterized in that: The valve stem (3) is movably connected to the valve cover (2) via a limit position, the main valve diaphragm (4) is fixedly connected to the valve cover (2), the main valve core (5) is snap-fittedly connected to the valve seat (10), and the pilot valve housing (14) is fixedly connected to the valve cover (2) via a connecting sleeve.

3. A cryogenic pressure relief valve for offshore oil drilling according to claim 1, characterized in that: The connecting pipe (801) is fixedly connected to the water inlet pipe (6) via a flange (802) and bolts, and the flow meter (803) is fixedly connected to the connecting pipe (801) via a mounting seat.

4. A cryogenic pressure relief valve for offshore oil drilling according to claim 1, characterized in that: The number of the motors (804) is two, and the two motors (804) and the connecting pipe (801) are fixedly mounted via a mounting frame, and the rotating sleeve (807) and the rotating rod (805) are rotatably connected via a bearing (806).

5. A cryogenic pressure relief valve for offshore oil drilling according to claim 1, characterized in that: The rotating sleeve (807) and the rotating rod (805) are fixedly engaged via a cylinder (808), a clamping block (809) and a pushing plate (811), and the clamping block (809) is engagedly connected with a clamping slot (810).

6. A cryogenic pressure relief valve for offshore oil drilling according to claim 1, characterized in that: The ends of the first heating tube (901), the second heating tube (904) and the third heating tube (906) are all installed with power bases (908), and the ends of the first discharge tube (902), the second heating tube (904) and the third discharge tube (907) are all sleeved with sealing covers (903).

7. A cryogenic pressure relief valve for offshore oil drilling according to claim 1, characterized in that: The number of the vibration motors (909) is two, and the vibration motors (909) and the pressure relief valve body (1) are fixedly mounted by bolts.

8. A cryogenic pressure relief valve for offshore oil drilling according to claim 1, characterized in that: The threaded rod (15) is movably connected to the pilot valve housing (14) and the nut (16) via bolts, and the two ends of the spring (17) are fixedly connected to the threaded rod (15) and the pilot valve core (18) respectively.

9. A cryogenic pressure relief valve for offshore oil drilling according to claim 1, characterized in that: The fixing plate (2004) is fixed to the threaded rod (15) by magnetic attraction, the folding cover (2003) is fixed to the guide valve housing (14) by adsorption via a counterweight ring (2002) and a magnetic attraction ring (2001), and the number of the anti-pressure rods (2005) is four.

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