Automatic switching device for multi-specification fixed throttling oil nozzles

Abstract

The utility model discloses an automatic switching device for multi-specification fixed throttling oil nozzles, and belongs to the technical field of automation of oil and gas exploitation equipment. Comprising a valve body, an upper cover, an upper plate, a packing seal, a rotary valve element, an annular support, a switching device mounting cavity, a lower plate, a rotating rod, a gear sealing plate, a bearing positioning part, a bearing, a motor, a gear, a gear mounting shell, a sealing steel ring, a fixed oil nozzle, a positioning plate, a top dismounting plate, a positioning protrusion, a positioning cover plate, a compression spring and other parts. According to the utility model, the function of automatically and quickly switching the fixed oil nozzles with multiple specifications is realized, and the problem that the existing fixed throttle valve device only has one specification of oil nozzle and cannot adapt to the sudden change of working conditions in oil and gas exploitation and needs to quickly replace the oil nozzle is solved; and when fixed oil nozzles of other specifications are replaced by existing fixed throttle valves, complicated disassembly and assembly are needed, the working procedures are tedious, and risks exist. Meanwhile, the throttle valve has the advantages of being capable of achieving throttle pressure drop linear adjustment within a certain range, high in adaptability, flexible in switching and accurate in positioning.

Description

Technical Field

[0001] The utility model relates to the technical field of automation of oil and gas production equipment, and particularly relates to an automatic switching device for multi-specification fixed throttle nozzles. Background Technique

[0002] In oil and gas production, choke manifolds are usually used to achieve the functions of throttling and pressure reduction and production allocation. The choke valve is an important component to realize the above functions of the choke manifold, and these functions are mainly achieved through fixed choke valves installed in the manifold. The fixed choke valve is an important component in the throttling pressure drop manifold. It can control the oil and gas flow rate and stabilize the wellhead pressure, prevent oil wells from being damaged due to overproduction, ensure the production rate and production efficiency of oil wells, and prevent accidents. Therefore, reasonably and effectively configuring the choke valves in the throttling and pressure reduction manifold is of great significance for improving the production efficiency, safety and sustainability of oil wells.

[0003] Existing choke valves can be classified into two categories: fixed choke valves and adjustable choke valves according to whether they can adjust the opening degree. The adjustable choke valve can adjust the opening degree of the valve or the size of the throttle hole according to the working conditions and process requirements, so as to change the flow rate and pressure drop of the gas and liquid passing through the choke valve. It has the advantages of high flexibility and wide adjustable range. However, the change in the opening degree of the valve of the adjustable choke valve does not show a stable linear relationship with the gas and liquid flow rate and pressure drop, so there is a problem that the gas and liquid flow rate and pressure drop cannot be accurately controlled. The fixed choke valve has a simple design, stable structure and low cost. It has a fixed flow rate setting and is suitable for occasions where a fixed flow rate is required. It has a certain degree of predictability and controllability. However, in the ground testing of oil and gas wells and the production process of oil and gas wells, etc., the fixed choke valve still has the following deficiencies.

[0004] (1) The existing fixed choke valve can only install one fixed nozzle and cannot be quickly adjusted according to the change of working conditions and operation requirements.

[0005] (2) When replacing other specifications of fixed nozzles for the existing fixed choke valve, the device needs to be disassembled and assembled complicatedly, which is time-consuming and there is a certain operation risk.

[0006] (3) During the replacement of the nozzle of the existing fixed choke valve, it is necessary to close the gate valves upstream and downstream of the fixed choke valve to relieve the pressure in the fixed choke valve before the fixed nozzle can be replaced, which makes the overall process complicated and affects the normal production efficiency.

[0007] (4) The existing fixed choke valve can only install one specification of nozzle and cannot achieve continuous adjustment of a certain range of linear opening degree and throttling pressure drop.

[0008] Therefore, in order to effectively combine the respective advantages of the adjustable throttle valve and the fixed throttle valve and effectively solve the deficiencies existing in the existing throttle valve during use, it is urgently necessary to invent a new type of throttle device to meet the requirements in the production process of oil and gas wells. During the production process of oil wells, factors such as oil well production and pressure will change over time. It is necessary to flexibly and quickly adjust the size or area of the flow passage of the throttle valve to meet the changing working conditions, so as to achieve the purpose of linearly adjusting the flow rate and pressure drop within a certain range with the opening degree. Summary of the Invention

[0009] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a multi-specification fixed throttle nozzle automatic switching device. The present invention drives a rotating rod by a motor to rotate a rotating valve core, thereby achieving the purpose of switching fixed nozzles. Since multiple groups of fixed nozzles are installed in the rotating valve core, fixed nozzles suitable for the working conditions can be quickly switched according to the needs of the working conditions to work, solving the problem that the traditional fixed throttle valve has only one specification nozzle and cannot adapt to the sudden change of working conditions in oil and gas exploitation and requires quick replacement of the nozzle, as well as the problem that the production efficiency decreases when replacing fixed nozzles of different specifications and it is necessary to close the upstream and downstream valves; the fixed nozzles of the present invention can be replaced by removing the top disassembly and assembly plate. When the fixed nozzles need to be replaced due to erosion or other reasons, the fixed nozzles can be taken out and replaced from the top, solving the problem that the process of replacing fixed nozzles in the traditional fixed throttle valve is cumbersome and lengthy, and it is necessary to disassemble from the outside to the inside, resulting in a large assembly difficulty; auxiliary positioning is carried out by using parts such as a positioning disk, a compression spring, a positioning protrusion, and a positioning cover plate. When working normally, the positioning protrusion is under the pressure of the compression spring and falls on the positioning groove Ⅰ on the positioning disk, so that the rotating valve core remains fixed after being impacted by downhole gas and liquid, enabling the present invention to work normally. When the downhole working conditions change and it is necessary to switch to other fixed nozzles of different specifications, the motor rotates to drive the positioning disk fixed on the rotating valve core to rotate, so that the positioning protrusion leaves the existing positioning groove and slides in the chute. When the fixed nozzle switching is completed, the positioning protrusion falls into other positioning grooves to fix the rotating valve core and make it no longer move, reducing the electrical control difficulty of precise positioning, and solving the problems that the fixed nozzle cannot be accurately positioned in the middle of the channel during switching and the rotating valve core is rotated by downhole gas and liquid impact, driving the fixed nozzle to deflect.

[0010] The object of the present utility model is achieved through the following technical solutions: A multi-specification fixed throttle nozzle automatic switching device, characterized in that: it includes a valve body, an upper cover, an upper plate, a packing seal I, a rotary valve core, an annular support, a switching device installation cavity, a lower plate, a rotating rod, a gear seal plate, a bearing mounting seat, a deep groove ball bearing I, a motor, a gear I, a packing seal II, a gear II, a gear mounting shell, a deep groove ball bearing II, a cylindrical thrust bearing, a sealing steel ring, a packing seal III, a fixed nozzle, a positioning plate, a top disassembly and assembly plate, a positioning protrusion, a positioning cover plate, a compression spring, a motor fixing seat. The valve body is provided with a through hole I, a through hole II, a sealing ring installation groove I, a flow-through channel I, a through hole III, and an installation hole I. The rotary valve core is provided with a round hole II, a threaded hole III, a threaded hole IV, a rectangular groove I, and a boss I. The switching device installation cavity is provided with a threaded hole V, a threaded hole VI, a sealing ring installation groove VI, a threaded hole VII, a sealing ring installation groove VII, a through hole V, and a cylindrical protrusion. The lower plate is provided with a groove II, a groove III, a round hole III, a sealing ring installation groove VIII, and a cylindrical protrusion I. The rotating rod is provided with a rectangular boss, a step I, and a through hole VI. The positioning protrusion is provided with a spring installation groove and a sliding protrusion. The sealing ring installation groove I is used for installing a sealing ring. The sealing ring installation groove VIII is used for installing a sealing ring. The threaded hole V on the switching device installation cavity is connected to the through hole I by a screw. The threaded hole VI on the switching device installation cavity is connected to the through hole II by a screw. The sealing ring installation groove VI is used for installing a sealing ring. The sealing ring installation groove VII is used for installing a sealing ring. The lower plate is installed in the switching device installation cavity. The cylindrical protrusion I on the lower plate is installed in the flow-through channel I. The annular support is installed on the groove II of the lower plate. The deep groove ball bearing II is installed on the round hole III of the lower plate. The sealing steel ring is installed on the lower plate. The cylindrical thrust bearing is installed on the lower plate. The groove III is used for installing a sealing ring. The rotary valve core is installed on the cylindrical thrust bearing. The packing seal III is installed outside the rotary valve core. The packing seal I is installed outside the rotary valve core. The upper plate is installed above the annular support. The rotating rod is installed inside the rotary valve core. The through hole VI on the rotating rod is matched with the threaded hole IV on the rotary valve core by a screw. The rectangular boss on the rotating rod is installed in the rectangular groove I on the rotary valve core. There are a total of 4 groups and 8 fixed nozzles, and the specifications of the same group are the same. The fixed nozzles are installed in the round hole II of the rotary valve core. The positioning plate is installed on the rotary valve core. The positioning protrusion is installed inside the upper plate. The compression spring is installed in the spring installation groove. The positioning cover plate is installed above the upper plate. The upper cover is installed above the upper plate. The top disassembly and assembly plate is provided with a through hole X. The top disassembly and assembly plate is installed inside the upper cover. The packing seal II is installed between the rotating rod and the switching device installation cavity. The gear mounting shell is installed at the lower end of the switching device installation cavity. The gear I is installed inside the gear mounting shell. The gear II is installed inside the gear mounting shell. The gear seal plate is installed outside the gear mounting shell. The bearing mounting seat is installed below the gear seal plate.The deep groove ball bearing I is installed in the bearing mount, the motor is installed on the motor fixing base, and the motor fixing base is installed on the valve body.

[0011] Further, the upper cover is provided with a sealing ring mounting groove II, a threaded hole I, a threaded hole II, a through hole IV, a sealing ring mounting groove III, and a sealing ring mounting groove IV. The threaded hole I is fixed to the through hole III on the valve body by a screw, the threaded hole II is fixed to the through hole X on the top disassembly and assembly plate by a screw, the through hole IV is connected to the through hole V on the switching device mounting cavity by a bolt, and the sealing ring mounting grooves II, III, and IV are used for installing sealing rings.

[0012] Further, the upper plate is provided with an overcurrent channel II, a convex mounting groove I, a sealing ring mounting groove V, a round hole I, and a groove I. The overcurrent channel II is coaxial with the overcurrent channel I. The sliding convex on the positioning convex is installed in the convex mounting groove I. The top disassembly and assembly plate is installed in the round hole I. The sealing ring mounting groove V is used for installing a sealing ring.

[0013] Further, the annular support is provided with a convex platform II and a convex platform III. The convex platform II is installed in the groove I, and the convex platform III is installed in the groove II.

[0014] Further, the gear sealing plate is provided with a convex platform IV, a convex platform V, a through hole VII, a round hole IV, and a mounting hole II. The gear I is installed between the convex platform IV and the step I. The gear II is installed on the convex platform V. The lower end of the rotating rod is installed in the round hole IV. The mounting hole II is used for installing a motor.

[0015] Further, the gear mounting shell is provided with a cylindrical convex II, a through hole VIII, and a threaded hole VIII. The threaded hole VIII is connected to the through hole VII on the gear sealing plate by a screw; the cylindrical convex II is installed in the cylindrical convex, and the through hole VIII is connected to the threaded hole VII on the switching device mounting cavity by a screw.

[0016] Further, the sealing steel ring is provided with a convex platform VI, and the convex platform VI is in contact with the convex platform I on the rotary spool.

[0017] Further, the positioning plate is provided with a through hole IX, a positioning groove, and a sliding groove. The through hole IX is fixed to the threaded hole III on the rotary spool by a screw.

[0018] Further, the positioning cover plate is provided with a sealing convex, and the sealing convex is installed in the convex mounting groove I.

[0019] The present invention also provides a throttling method for a multi - specification fixed throttle orifice automatic switching device, and the steps are as follows:

[0020] I. Replace the eroded fixed orifice, including the following steps;

[0021] S1. Monitor whether the fixed nozzle is eroded

[0022] By using instruments such as a flowmeter or a pressure gauge, measure whether the flow rate or pressure is normal. If the flow rate becomes smaller or uneven, or under the same working conditions, the pressure drops significantly, it indicates that the working fixed nozzle has been eroded and needs to be replaced;

[0023] S2. Switch to a fixed nozzle of the same specification for operation

[0024] The fixed nozzles of the same specification of the present utility model are symmetrically placed in the rotary valve core. When the fixed nozzle needs to be replaced, the motor starts, and the rotary rod is rotated to drive the rotary valve core to rotate, so as to switch to a fixed nozzle of the same specification for operation. When the rotary valve core rotates, the positioning disk on the rotary valve core makes the positioning protrusion leave the existing positioning groove and slide in the chute. When the fixed nozzle switching is completed, the positioning protrusion falls into other positioning grooves, thereby fixing the rotary valve core so that it no longer rotates;

[0025] S3. Replacement

[0026] At this time, the eroded fixed nozzle has been rotated under the top disassembly and assembly plate. At this time, the top disassembly and assembly plate is opened, and the eroded fixed nozzle is replaced. After the replacement is completed, the top disassembly and assembly plate is installed to complete this replacement work;

[0027] II. Switch to fixed nozzles of different specifications

[0028] S1. Detect whether the current fixed nozzle meets the working conditions

[0029] By using instruments such as a flowmeter or a pressure gauge, judge whether the existing fixed nozzle meets the current working conditions. If it meets, continue to operate. If it does not meet, a fixed nozzle that meets the current working conditions needs to be switched for operation;

[0030] S2. Judgment

[0031] According to the requirements of the current working conditions, determine the required working flow rate range, and then judge which specification of fixed nozzle to use;

[0032] S3. Switch

[0033] The motor starts, and the rotary rod is rotated to drive the rotary valve core to rotate, so as to switch to a fixed nozzle of the same specification for operation. When the rotary valve core rotates, the positioning disk on the rotary valve core makes the positioning protrusion leave the existing positioning groove and slide in the chute. When the fixed nozzle switching is completed, the positioning protrusion falls into other positioning grooves, thereby fixing the rotary valve core so that it no longer rotates.

[0034] The beneficial effects of the present utility model are:

[0035] (1) It is equipped with multiple groups of fixed nozzles with different specifications, and can adapt to sudden changes in working conditions during oil and gas exploitation by quickly switching fixed nozzles with different specifications.

[0036] (2) Simplify the replacement method of the fixed nozzle, reduce the disassembly and assembly difficulty, and save the assembly time.

[0037] (3) During the switching process of the fixed nozzle, there is no need to stop production, ensuring the normal production efficiency.

[0038] (4) Realize the continuous adjustment of linear opening and throttling pressure drop within a certain range.

[0039] (5) It is provided with multi-stage and systematic sealing protection inside, which not only avoids the leakage of downhole gas and liquid, but also makes the parts in the installation cavity of the switching device not affected by the high pressure erosion of liquid and gas, and slows down the wear and damage of parts caused by the erosion of liquid and gas.

[0040] (6) Use mechanical auxiliary positioning to reduce the difficulty of electronic control. During switching, the fixed nozzle can be located in the center of the flow channel, avoiding the situation of incorrect alignment after the fixed nozzle is switched. Description of the Drawings

[0041] Figure 1 It is a full-section schematic diagram of the present utility model;

[0042] Figure 2 It is a three-dimensional schematic diagram of the valve body of the present utility model;

[0043] Figure 3 It is a three-dimensional schematic diagram of the upper cover of the present utility model;

[0044] Figure 4 It is a three-dimensional schematic diagram of the upper plate of the present utility model;

[0045] Figure 5 It is a three-dimensional schematic diagram and a half-section schematic diagram of the rotary valve core of the present utility model;

[0046] Figure 6 It is a half-section schematic diagram and a three-dimensional schematic diagram of the annular support of the present utility model;

[0047] Figure 7 It is a three-dimensional schematic diagram of the installation cavity of the switching device of the present utility model;

[0048] Figure 8 It is a half-section schematic diagram and a three-dimensional schematic diagram of the lower plate of the present utility model;

[0049] Figure 9 It is a three-dimensional schematic diagram of the rotating rod of the present utility model;

[0050] Figure 10 It is a three-dimensional schematic diagram of the gear sealing plate of the present utility model;

[0051] Figure 11 3D schematic diagram of the gear mounting housing of the present utility model;

[0052] Figure 12 3D schematic diagram of the sealing steel ring of the present utility model;

[0053] Figure 13 3D schematic diagram of the positioning plate of the present utility model;

[0054] Figure 14 3D schematic diagram of the top disassembly and assembly plate of the present utility model;

[0055] Figure 15 3D schematic diagram of the positioning protrusion of the present utility model;

[0056] Figure 16 3D schematic diagram of the positioning cover plate of the present utility model;

[0057] In the figure, 1 is the valve body; 101 is the through-hole Ⅰ; 102 is the through-hole Ⅱ; 103 is the seal ring installation groove Ⅰ; 104 is the flow-through channel Ⅰ; 105 is the through-hole Ⅲ; 106 is the installation hole Ⅰ; 2 is the upper cover; 201 is the seal ring installation groove Ⅱ; 202 is the threaded hole Ⅰ; 203 is the threaded hole Ⅱ; 204 is the through-hole Ⅳ; 205 is the seal ring installation groove Ⅲ; 206 is the seal ring installation groove Ⅳ; 3 is the upper plate; 301 is the flow-through channel Ⅱ; 302 is the convex installation groove Ⅰ; 303 is the seal ring installation groove Ⅴ; 304 is the round hole Ⅰ; 305 is the groove Ⅰ; 4 is the packing seal Ⅰ; 5 is the rotary valve core; 501 is the round hole Ⅱ; 502 is the threaded hole Ⅲ; 503 is the threaded hole Ⅳ; 504 is the rectangular groove Ⅰ; 505 is the convex platform Ⅰ; 6 is the annular support; 601 is the convex platform Ⅱ; 602 is the convex platform Ⅲ; 7 is the switching device installation cavity; 701 is the threaded hole Ⅴ; 702 is the threaded hole Ⅵ; 703 is the seal ring installation groove Ⅵ; 704 is the threaded hole Ⅶ; 705 is the seal ring installation groove Ⅶ; 706 is the through-hole Ⅴ; 8 is the lower plate; 801 is the groove Ⅱ; 802 is the groove Ⅲ; 803 is the round hole Ⅲ; 804 is the seal ring installation groove Ⅷ; 805 is the cylindrical protrusion Ⅰ; 9 is the rotating rod; 901 is the rectangular convex platform; 902 is the step Ⅰ; 903 is the through-hole Ⅵ; 10 is the gear seal plate; 1001 is the convex platform Ⅳ; 1002 is the convex platform Ⅴ; 1003 is the through-hole Ⅶ; 1004 is the round hole Ⅳ; 1005 is the installation hole Ⅱ; 11 is the bearing mounting seat; 12 is the deep groove ball bearing Ⅰ; 13 is the motor; 14 is the gear Ⅰ; 15 is the packing seal Ⅱ; 16 is the gear Ⅱ; 17 is the gear mounting shell; 1701 is the cylindrical protrusion Ⅱ; 1702 is the through-hole Ⅷ; 1703 is the threaded hole Ⅷ; 18 is the deep groove ball bearing Ⅱ; 19 is the cylindrical thrust bearing; 20 is the seal steel ring; 21 is the packing seal Ⅲ; 22 is the fixed oil nozzle; 23 is the positioning plate; 2301 is the through-hole Ⅸ; 2302 is the positioning groove; 2303 is the sliding groove; 24 is the top disassembly and assembly plate; 2401 is the through-hole Ⅹ; 25 is the positioning protrusion; 2501 is the spring installation groove; 2502 is the sliding protrusion; 26 is the positioning cover plate; 2601 is the sealing protrusion; 27 is the compression spring; 28 is the motor fixing seat Detailed implementation mode

[0058] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments of the present utility model belong to the protection scope of the present utility model.

[0059] In the description of the present utility model, it should be noted that the directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings. These are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance.

[0060] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0061] In addition, the technical features involved in different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0062] Such as Figures 1-16As shown in the figure, a multi-specification fixed throttle nozzle automatic switching device, characterized in that: it includes a valve body 1, an upper cover 2, an upper plate 3, a packing seal I 4, a rotary spool 5, an annular support 6, a switching device installation cavity 7, a lower plate 8, a rotating rod 9, a gear seal plate 10, a bearing mounting seat 11, a deep groove ball bearing I 12, a motor 13, a gear I 14, a packing seal II 15, a gear II 16, a gear mounting shell 17, a deep groove ball bearing II 18, a cylindrical thrust bearing 19, a sealing steel ring 20, a packing seal III 21, a fixed nozzle 22, a positioning plate 23, a top disassembly and assembly plate 24, a positioning projection 25, a positioning cover plate 26, a compression spring 27, a motor fixing seat 28. The valve body 1 is provided with a through hole I 101, a through hole II 102, a sealing ring installation groove I 103, a flow passage I 104, a through hole III 105, and a mounting hole I 106. The rotary spool 5 is provided with a round hole II 501, a threaded hole III 502, a threaded hole IV 503, a rectangular groove I 504, and a boss I 505. The switching device installation cavity 7 is provided with a threaded hole V 701, a threaded hole VI 702, a sealing ring installation groove VI 703, a threaded hole VII 704, a sealing ring installation groove VII 705, a through hole V 706, and a cylindrical projection 707. The lower plate 8 is provided with a groove II 801, a groove III 802, a round hole III 803, a sealing ring installation groove VIII 804, and a cylindrical projection I 805. The rotating rod 9 is provided with a rectangular boss 901, a step I 902, and a through hole VI 903. The positioning projection 25 is provided with a spring installation groove 2501 and a sliding projection 2502. The sealing ring installation groove I 103 is used for installing a sealing ring. The sealing ring installation groove VIII 804 is used for installing a sealing ring. The threaded hole V 701 on the switching device installation cavity 7 is connected to the through hole I 101 by a screw. The threaded hole VI 702 on the switching device installation cavity 7 is connected to the through hole II 102 by a screw. The sealing ring installation groove VI 703 is used for installing a sealing ring. The sealing ring installation groove VII 705 is used for installing a sealing ring. The lower plate 8 is installed in the switching device installation cavity 7. The cylindrical projection I 805 on the lower plate 8 is installed in the flow passage I 104. The annular support 6 is installed on the groove II 801 of the lower plate (8). The deep groove ball bearing II 18 is installed on the round hole III 803 of the lower plate 8. The sealing steel ring 20 is installed on the lower plate 8. The cylindrical thrust bearing 19 is installed on the lower plate 8. The groove III 802 is used for installing a sealing ring. The rotary spool 5 is installed on the cylindrical thrust bearing 19. The packing seal III 21 is installed outside the rotary spool 5. The packing seal I 4 is installed outside the rotary spool 5. The upper plate 3 is installed above the annular support 6. The rotating rod 9 is installed inside the rotary spool 5. The through hole VI 903 on the rotating rod 9 is matched with the threaded hole IV 503 on the rotary spool 5 by a screw. The rectangular boss 901 on the rotating rod 9 is installed in the rectangular groove I 504 on the rotary spool 5. There are a total of 4 groups of 8 fixed nozzles 22, and the specifications of the same group are the same. The fixed nozzles 22 are installed in the round hole II 501 on the rotary spool 5.The positioning plate 23 is installed on the rotating valve core 5, the positioning protrusion 25 is installed in the upper plate 3, the compression spring 27 is installed in the spring installation groove 2501, the positioning cover plate 26 is installed above the upper plate 3, the upper cover 2 is installed above the upper plate 3, the top disassembly and assembly plate 24 is provided with a through hole Ⅹ2401, and the top disassembly and assembly plate 24 is installed in the upper cover 2. The packing seal Ⅱ15 is installed between the rotating rod 9 and the switching device installation cavity 7. The gear installation shell 17 is installed at the lower end of the switching device installation cavity 7. The gear Ⅰ14 is installed in the gear installation shell 17. The gear Ⅱ16 is installed in the gear installation shell 17. The gear sealing plate 10 is installed outside the gear installation shell 17. The bearing installation seat 11 is installed below the gear sealing plate 10. The deep groove ball bearing Ⅰ12 is installed in the bearing installation seat 11. The motor 13 is installed on the motor fixing seat 28. The motor 13 is installed on the motor fixing seat 28, and the motor fixing seat 28 is installed on the valve body 1.,

[0063] In one embodiment, the upper cover 2 is provided with a sealing ring installation groove Ⅱ201, a threaded hole Ⅰ202, a threaded hole Ⅱ203, a through hole Ⅳ204, a sealing ring installation groove Ⅲ205, and a sealing ring installation groove Ⅳ206. The threaded hole Ⅰ202 is fixed to the through hole Ⅲ105 on the valve body 1 by screws. The threaded hole Ⅱ203 is fixed to the through hole Ⅹ2401 of the top disassembly and assembly plate 24 by screws. The through hole Ⅳ204 is connected to the through hole Ⅴ706 on the switching device installation cavity 7 by bolts. The sealing ring installation groove Ⅱ201, the sealing ring installation groove Ⅲ205, and the sealing ring installation groove Ⅳ206 are used for installing sealing rings, and multiple seals avoid the leakage of liquid in the cavity.

[0064] In one embodiment, the upper plate 3 is provided with an overflow channel Ⅱ301, a convex installation groove Ⅰ302, a sealing ring installation groove Ⅴ303, a round hole Ⅰ304, and a groove Ⅰ305. The overflow channel Ⅱ301 is coaxial with the overflow channel Ⅰ104. The sliding protrusion 2502 on the positioning protrusion 25 is installed in the convex installation groove Ⅰ302 to assist in positioning the rotation of the rotating valve core 5 so that it rotates to the correct position. The top disassembly and assembly plate 24 is installed in the round hole Ⅰ304. The sealing ring installation groove Ⅴ303 is used for installing a sealing ring to avoid the leakage of liquid in the cavity.

[0065] In one embodiment, the annular support 6 is provided with a convex platform Ⅱ601 and a convex platform Ⅲ602. The convex platform Ⅱ601 is installed in the groove Ⅰ305, and the convex platform Ⅲ602 is installed in the groove Ⅱ801. The annular support 6 is used to support and fix the upper plate 3.

[0066] In one embodiment, the gear sealing plate 10 is provided with a boss Ⅳ 1001, a boss Ⅴ 1002, a through hole Ⅶ 1003, a round hole Ⅳ 1004, and a mounting hole Ⅱ 1005. The gear Ⅰ 14 is installed between the boss Ⅳ 1001 and the step Ⅰ 902. The gear Ⅱ 16 is installed on the boss Ⅴ 1002. The lower end of the rotating rod 9 is installed in the round hole Ⅳ 1004. The mounting hole Ⅱ 1005 is used to install the motor 13.

[0067] In one embodiment, the gear mounting housing 17 is provided with a cylindrical protrusion Ⅱ 1701, a through hole Ⅷ 1702, and a threaded hole Ⅷ 1703. The threaded hole Ⅷ 1703 is connected to the through hole Ⅶ 1003 on the gear sealing plate 10 by a screw; the cylindrical protrusion Ⅱ 1701 is installed in the cylindrical protrusion 707, and the through hole Ⅷ 1702 is connected to the threaded hole Ⅶ 704 on the switching device installation cavity 7 by a screw.

[0068] In one embodiment, the sealing steel ring 20 is provided with a boss Ⅵ 2001. The boss Ⅵ 2001 contacts and presses the rubber ring against the boss Ⅰ 505 on the rotary valve core 5 to complete the sealing.

[0069] In one embodiment, the positioning plate 23 is provided with a through hole Ⅸ 2301, a positioning groove 2302, and a sliding groove 2303. The through hole Ⅸ 2301 is fixed to the threaded hole Ⅲ 502 on the rotary valve core 5 by a screw. The positioning protrusion 25 can slide in the positioning groove 2302 and the sliding groove 2303, thereby assisting in the circumferential positioning of the rotary valve core 5.

[0070] In one embodiment, the positioning cover plate 26 is provided with a sealing protrusion 2601. The sealing protrusion 2601 is installed in the protrusion installation groove Ⅰ 302 to fix the positioning protrusion 25.

[0071] The present invention also provides a throttling method for a multi-specification fixed throttle nozzle automatic switching device, and the steps are as follows.

[0072] Ⅰ. Replace the eroded fixed nozzle 22, including the following steps;

[0073] S1. Monitor whether the fixed nozzle 22 is eroded.

[0074] By using instruments such as a flow meter or a pressure gauge, measure whether the flow rate or pressure is normal. If there is a decrease in flow rate or unevenness, or a large drop in pressure under the same working conditions, it indicates that the working fixed nozzle 22 has been eroded and needs to be replaced.

[0075] S2. Switch to a fixed nozzle 22 of the same specification for operation.

[0076] The fixed nozzles 22 of the same specification of the present utility model are symmetrically placed in the rotating valve core 5. When the fixed nozzle 22 needs to be replaced, the motor 13 is started, and the rotating rod 9 is rotated to drive the rotating valve core 5 to rotate, so as to switch the fixed nozzles 22 of the same specification to work. When the rotating valve core 5 rotates, the positioning disc 23 on the rotating valve core 5 makes the positioning protrusion 25 leave the existing positioning groove 2302 and slide in the sliding groove 2303. When the replacement of the fixed nozzle 22 is completed, the positioning protrusion 25 falls into other positioning grooves 2302, so as to fix the rotating valve core 5 and make it stop rotating;

[0077] S3. Replacement

[0078] At this time, the eroded fixed nozzle 22 has been rotated to the lower part of the top disassembly and assembly plate 24. At this time, the top disassembly and assembly plate 24 is opened, and the eroded fixed nozzle 22 is replaced. After the replacement is completed, the top disassembly and assembly plate 24 is installed to complete this replacement work;

[0079] II. Switching fixed nozzles 22 of different specifications

[0080] S1. Detect whether the current fixed nozzle 22 meets the working conditions

[0081] By using instruments such as a flow meter or a pressure gauge, it is judged whether the existing fixed nozzle 22 meets the current working conditions. If it meets, the work continues. If it does not meet, the fixed nozzle 22 that meets the current working conditions needs to be switched to work;

[0082] S2. Judgment

[0083] According to the requirements of the current working conditions, the required working flow range is determined, and then it is judged which specification of the fixed nozzle 22 to use;

[0084] S3. Switching

[0085] The motor 13 is started, and the rotating rod 9 is rotated to drive the rotating valve core 5 to rotate, so as to switch the fixed nozzles 22 of the same specification to work. When the rotating valve core 5 rotates, the positioning disc 23 on the rotating valve core 5 makes the positioning protrusion 25 leave the existing positioning groove 2302 and slide in the sliding groove 2303. When the replacement of the fixed nozzle 22 is completed, the positioning protrusion 25 falls into other positioning grooves 2302, so as to fix the rotating valve core 5 and make it stop rotating.

[0086] Obviously, the above embodiments are only examples given for clear illustration, rather than limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present utility model.

Claims

1. An automatic switching device for multi-specification fixed throttle oil nozzles, characterized in that: It comprises a valve body (1), an upper cover (2), an upper plate (3), a packing seal I (4), a rotating valve core (5), an annular support (6), a switching device installation chamber (7), a lower plate (8), a rotating rod (9), a gear sealing plate (10), a bearing installation seat (11), a deep groove ball bearing I (12), a motor (13), a gear I (14), a packing seal II (15), a gear II (16), a gear installation shell (17), a deep groove ball bearing II (18), a cylindrical thrust bearing (19), a sealing steel ring (20), a packing seal III (21), a fixed oil nozzle (22), a positioning plate (23), a top disassembly plate (24), a positioning protrusion (25), a positioning cover plate (26), a compression spring (27), and a motor fixing seat (28). The valve body (1) is provided with a through hole I (101), a through hole II (102), a sealing ring installation groove I (103), a flow passage I (104), a through hole Ⅲ (105), mounting hole Ⅰ (106), the rotary valve core (5) is provided with a circular hole Ⅱ (501), a threaded hole Ⅲ (502), a threaded hole Ⅳ (503), a rectangular groove Ⅰ (504), and a boss Ⅰ (505), and the switching device mounting cavity (7) is provided with a threaded hole Ⅴ (701), a threaded hole Ⅵ (702), a sealing ring mounting groove Ⅵ (703), a threaded hole Ⅶ (704), a sealing ring mounting groove Ⅶ (705), a through hole Ⅴ (706), cylindrical protrusion (707), the lower plate (8) is provided with a groove II (801), a groove III (802), a circular hole III (803), a sealing ring installation groove VIII (804), and a cylindrical protrusion I (805), the rotating rod (9) is provided with a rectangular boss (901), a step I (902), and a through hole VI (903), and the positioning protrusion (25) is provided with a spring installation groove (2501) and a sliding protrusion (2502);The sealing ring installation groove I (103) is used to install the sealing ring, the sealing ring installation groove VIII (804) is used to install the sealing ring, the threaded hole V (701) on the switching device installation cavity (7) is connected to the through hole I (101) by screws, the threaded hole VI (702) on the switching device installation cavity (7) is connected to the through hole II (102) by screws, the sealing ring installation groove VI (703) is used to install the sealing ring, the sealing ring installation groove VII (705) is used to install the sealing ring, the lower plate (8) is installed in the switching device installation cavity (7), the cylindrical protrusion I (805) on the lower plate (8) is installed in the flow channel I (104), and the annular support (6) is installed in the groove on the lower plate (8). The deep groove ball bearing II (18) is mounted on the circular hole III (803) on the lower plate (8), the sealing steel ring (20) is mounted on the lower plate (8), the cylindrical thrust bearing (19) is mounted on the lower plate (8), the groove III (802) is used to mount the sealing ring, the rotary valve core (5) is mounted on the cylindrical thrust bearing (19), the packing seal III (21) is mounted outside the rotary valve core (5), the packing seal I (4) is mounted outside the rotary valve core (5), the upper plate (3) is mounted above the annular support (6), the rotating rod (9) is mounted inside the rotary valve core (5), the through hole VI (903) on the rotating rod (9) is connected to the threaded hole IV (503) on the rotary valve core (5) ) are screwed together, the rectangular boss (901) on the rotating rod (9) is installed in the rectangular groove I (504) on the rotating valve core (5), the fixed oil nozzle (22) is 4 groups with a total of 8 pieces and the same specifications, the fixed oil nozzle (22) is installed in the round hole II (501) on the rotating valve core (5), the positioning plate (23) is installed on the rotating valve core (5), the positioning protrusion (25) is installed in the upper plate (3), the compression spring (27) is installed in the spring installation groove (2501), the positioning cover plate (26) is installed above the upper plate (3), the upper cover (2) is installed above the upper plate (3), the top disassembly plate (24) is provided with a through hole X (2401), the top disassembly plate (24) is installed in the upper cover (2), the packing seal II (15) is installed between the rotating rod (9) and the switching device installation cavity (7), the gear installation housing (17) is installed at the lower end of the switching device installation cavity (7), the gear I (14) is installed in the gear installation housing (17), the gear II (16) is installed in the gear installation housing (17), the gear sealing plate (10) is installed outside the gear installation housing (17), the bearing mounting seat (11) is installed below the gear sealing plate (10), the deep groove ball bearing I (12) is installed in the bearing mounting seat (11), the motor (13) is installed on the motor fixing seat (28), and the motor fixing seat (28) is installed on the valve body (1). ; 2. The automatic switching device for multi-specification fixed throttle oil nozzles according to claim 1 is characterized in that: The upper cover (2) is provided with a sealing ring installation groove II (201), a threaded hole I (202), a threaded hole II (203), a through hole IV (204), a sealing ring installation groove III (205), and a sealing ring installation groove IV (206). The threaded hole I (202) is fixed to the through hole III (105) on the valve body (1) by screws, the threaded hole II (203) is fixed to the through hole X (2401) of the top disassembly plate (24) by screws, the through hole IV (204) is connected to the through hole V (706) on the switching device installation cavity (7) by bolts, and the sealing ring installation groove II (201), the sealing ring installation groove III (205), and the sealing ring installation groove IV (206) are used for installing the sealing ring.

3. The automatic switching device for multi-specification fixed throttle oil nozzles according to claim 1 is characterized in that: The upper plate (3) is provided with a flow channel II (301), a protrusion mounting groove I (302), a sealing ring mounting groove V (303), a circular hole I (304), and a groove I (305). The flow channel II (301) is coaxial with the flow channel I (104). The sliding protrusion (2502) on the positioning protrusion (25) is installed in the protrusion mounting groove I (302). The top disassembly plate (24) is installed in the circular hole I (304). The sealing ring mounting groove V (303) is used to install the sealing ring.

4. The automatic switching device for multi-specification fixed throttle oil nozzles according to claim 1 is characterized in that: The annular support (6) is provided with a boss II (601) and a boss III (602), wherein the boss II (601) is installed in the groove I (305), and the boss III (602) is installed in the groove II (801).

5. The automatic switching device for multi-specification fixed throttle oil nozzles according to claim 1 is characterized in that: The gear sealing plate (10) is provided with a boss IV (1001), a boss V (1002), a through hole VII (1003), a circular hole IV (1004), and a mounting hole II (1005); the gear I (14) is mounted between the boss IV (1001) and the step I (902); the gear II (16) is mounted on the boss V (1002); the lower end of the rotating rod (9) is mounted in the circular hole IV (1004); and the mounting hole II (1005) is used for mounting the motor (13).

6. The automatic switching device for multi-specification fixed throttle oil nozzles according to claim 1 is characterized in that: The gear mounting housing (17) is provided with a cylindrical protrusion II (1701), a through hole VIII (1702), and a threaded hole VIII (1703); the threaded hole VIII (1703) is connected to the through hole VII (1003) on the gear sealing plate (10) by screws; the cylindrical protrusion II (1701) is installed in the cylindrical protrusion (707), and the through hole VIII (1702) is connected to the threaded hole VII (704) on the switching device mounting cavity (7) by screws.

7. The automatic switching device for multi-specification fixed throttle oil nozzles according to claim 1 is characterized in that: The sealing steel ring (20) is provided with a boss VI (2001), and the boss VI (2001) is in contact with the boss I (505) on the rotary valve core (5).

8. The automatic switching device for multi-specification fixed throttle oil nozzles according to claim 1 is characterized in that: The positioning plate (23) is provided with a through hole IX (2301), a positioning groove (2302), and a sliding groove (2303), and the through hole IX (2301) and the threaded hole III (502) on the rotary valve core (5) are fixed by screws.

9. The automatic switching device for multi-specification fixed throttle oil nozzles according to claim 1, characterized in that: The positioning cover plate (26) is provided with a sealing protrusion (2601), and the sealing protrusion (2601) is installed in the protrusion installation groove I (302).

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