A pulse generator

Abstract

The application discloses a kind of pulse generator, comprising: end sequentially connected sliding seal top assembly, pump assembly, swash plate, magnetic shaft self-filter assembly and generator coil assembly, sliding seal top assembly includes top shell, top cap, telescopic rod, sliding seal assembly, sliding seal device and piston, top cap is fixedly connected with top shell, sliding seal assembly is fixedly connected with top cap, the side wall of telescopic rod near front end is abutted on sliding seal assembly, the end of telescopic rod is fixedly connected in the front end of piston, the side wall of piston near rear end is equipped with recess, recess is equipped with first sealing element, first sealing element is abutted on the inner wall of top shell, sliding channel is formed between telescopic rod and the inner wall of top shell, sliding seal device is placed in sliding channel.The scheme of the application avoids the problems that the rubber seal of the pulse generator is easy to break, the internal part is easy to be blocked due to the carbonization of hydraulic oil, and improves the reliability of the pulse generator.

Description

Technical Field

[0001] This invention relates to the field of oil drilling technology, and more particularly to a pulse generator. Background Technology

[0002] Deep water, deep wells, and unconventional technologies represent the three major directions for the future development of China's oil and gas industry. Currently, the highest temperature rating of existing domestic logging-while-drilling (MLD) instruments is 150℃, but historical data from domestic operating blocks shows that deep well formation temperatures have reached 160℃, with circulating temperatures exceeding 145℃. At present, only two companies, both domestically and internationally, possess limited resources to serve high-temperature projects. Due to insufficient equipment capabilities, frequent instrument failures and subsequent downtime are common among service providers, particularly pulse generator malfunctions.

[0003] The long-stroke rubber-sleeved pulse generators commonly used in current construction processes have the following drawbacks:

[0004] (1) During high-temperature deep well construction, the top rubber expansion sleeve is very prone to bulging and rupture, allowing mud to seep in;

[0005] (2) Internal hydraulic oil carbonization, clogging the circuit and control valve;

[0006] (3) The insulation of the coil enameled wire is reduced, the output power is reduced, and the power supply of the downhole system fails;

[0007] (4) Deep well mud signals are weak and difficult to decode;

[0008] (5) The decoding parameters are limited and cannot transmit multiple formation parameters downhole.

[0009] Therefore, there is an urgent need for a pulse generator that can solve the above problems. Summary of the Invention

[0010] In view of this, the present invention proposes a pulse generator that solves the problems of existing pulse generators being prone to rubber seal cracking and clogging in high-temperature environments in deep wells, having a short service life, and being unable to meet the requirements for transmitting multiple geological parameters.

[0011] To achieve the above objectives, one aspect of the present invention provides a pulse generator, specifically comprising: a sliding seal top assembly, a pump assembly, a magnetic shaft self-filtering assembly, a generator coil assembly, and a swashplate. The ends of the sliding seal top assembly, the pump assembly, the swashplate, the magnetic shaft self-filtering assembly, and the generator coil assembly are connected sequentially. The sliding seal top assembly includes a top housing, a top cap, a telescopic rod, a sliding seal assembly, a sliding seal device, and a piston. The top cap is fixedly connected to the top housing, and the sliding seal assembly is fixedly connected to the top cap. The side wall of the telescopic rod near its front end abuts against the sliding seal assembly, and the end of the telescopic rod is fixedly connected to the front end of the piston. The side wall of the piston near its rear end has a groove, and a first sealing element is provided in the groove. The first sealing element abuts against the inner wall of the top housing. A sliding channel is formed between the telescopic rod and the inner wall of the top housing, and the sliding seal device is placed in the sliding channel.

[0012] In some embodiments, the sliding sealing top assembly further includes a straightening and positioning sleeve, which is placed in the sliding channel and fixedly connected to the top housing.

[0013] In some embodiments, the magnetic shaft self-filtering assembly includes a magnetic shaft self-filtering housing and a magnetic shaft self-filtering device disposed inside the magnetic shaft self-filtering housing. The magnetic shaft self-filtering device includes a flow guide body, a magnet assembly, and a filter screen. The flow guide body is hollow in the radial direction. A plurality of oil passages are provided between the outer wall and the inner wall of the flow guide body, allowing the outer wall and the inner wall of the flow guide body to pass through each other. The filter screen is fixedly connected to the outer wall of the flow guide body corresponding to the position of the oil passages.

[0014] In some embodiments, the magnetic shaft self-filtering device further includes a wear-resistant sleeve, which is fixedly connected to the front end of the flow guide body.

[0015] In some embodiments, the generator coil assembly includes a housing, a coil, a drive shaft, a magnetic core, a first bearing, and a second bearing. The coil is fixedly connected to the housing, and the magnetic core is fixedly connected to the drive shaft. The position of the magnetic core corresponds to the position of the coil. The first bearing and the second bearing abut against the front end and the end end of the drive shaft, respectively.

[0016] In some embodiments, the pulse generator further includes a linkage device, through which the end of the flow guide body is connected to the front end of the linkage drive shaft.

[0017] In some embodiments, the linkage device includes a first fixing member and a second fixing member fixedly connected to the inner wall of the first fixing member. The interiors of the first fixing member and the second fixing member are hollow. The second fixing member is fixedly connected to the second end of the magnetic shaft self-filtering device, and the first fixing member is fixedly connected to the first end of the linkage transmission shaft. The first fixing member abuts against the first bearing.

[0018] In some embodiments, the filter screen includes a support frame, the filter screen is fixedly connected to the flow guide body through the support frame, the middle part of the support frame is provided with the filter screen body, the filter screen body is positioned corresponding to the oil passage, and is used to filter the oil flowing into the oil passage.

[0019] In some embodiments, the top cap is hollow, the sidewall of the top cap has a passage that communicates with the sliding channel, and the interior of the first end of the top cap has a groove, the size of which corresponds to the sliding sealing assembly and is used to accommodate the sliding sealing assembly. The groove is threadedly connected to the sliding sealing assembly.

[0020] In some embodiments, a connecting portion is provided at the second end away from the first end of the top cap, the connecting portion being inserted into the interior of the top housing and threadedly connected to the inner wall of the top housing.

[0021] In some embodiments, the sliding seal assembly is hollow and includes a mounting portion and at least one sliding seal fixed to the inner wall of the mounting portion, the sliding seal abutting against the telescopic rod, the outer wall of the mounting portion being threaded, and the mounting portion being threadedly connected to the top cap.

[0022] In some embodiments, the mounting part is provided with an operating part on the end face near the telescopic rod, the operating part being used to screw the mounting part and the top cap together or apart.

[0023] In some embodiments, the sliding sealing device includes a sliding base, the front end face of which includes a first groove, and an O-ring is provided in the first groove.

[0024] In some embodiments, the outer wall of the sliding base includes a second groove, in which a second seal is provided, the second seal abutting against the inner wall of the top housing.

[0025] In some embodiments, the inner wall of the sliding base includes a third groove, and at least one third seal is provided in the third groove, the third seal abutting against the telescopic rod.

[0026] In some embodiments, the sliding sealing top assembly further includes a retaining ring, which is fixedly connected to the inner wall of the top housing, and the front end face of the retaining ring abuts against the rear end face of the straightening positioning sleeve for fixing the straightening positioning sleeve.

[0027] In some embodiments, the front end face of the straightening and positioning sleeve is provided with a plurality of protrusions, and the end face of the top outer shell opposite to the front end face of the straightening and positioning sleeve is provided with holes of a size and number corresponding to the protrusions, the holes being used to insert the protrusions.

[0028] In some embodiments, the front end of the piston includes a groove with an internal thread, and the end of the telescopic rod is provided with an external thread that matches the internal thread. The front end of the piston and the end of the telescopic rod are connected by engaging the internal thread and the external thread.

[0029] In some embodiments, the telescopic rod includes a telescopic rod body and a telescopic rod head threadedly connected to the telescopic rod body, the side wall of the telescopic rod body near the front end abutting against the sliding seal assembly, and the end of the telescopic rod body being fixedly connected to the front end of the piston.

[0030] The present invention has at least the following beneficial technical effects: The sliding seal assembly on the top of the pulse generator extends its service life, avoids the problem of rubber seal rupture during high-temperature deep well construction, and improves the reliability of the pulse generator. Furthermore, the selected telescopic rod shortens the working stroke of the pulse generator, reducing the cycle time of a single signal, enhancing signal strength, and enabling diversified transmission of geological parameters. The magnetic shaft self-filtering device avoids blockage problems such as internal circuit blockage and control valve blockage caused by hydraulic oil carbonization. The generator coil assembly provides power to the downhole parameter measuring instruments, ensuring stable power supply. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other embodiments can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the structure of the pulsation generator provided by the present invention;

[0033] Figure 2 A schematic diagram of the piston structure provided by the present invention;

[0034] Figure 3A schematic diagram of the magnetic shaft self-filtering device provided by the present invention;

[0035] Figure 4 This is a schematic diagram of the structure of the generator coil assembly provided by the present invention;

[0036] Figure 5 This is a schematic diagram of the structure of the filter screen provided by the present invention;

[0037] Figure 6 This is a schematic diagram of the sliding sealing assembly provided by the present invention;

[0038] Figure 7 for Figure 6 The left view;

[0039] Figure 8 This is a schematic diagram of the sliding sealing device provided by the present invention;

[0040] Figure 9 This is a schematic diagram of the retaining ring provided by the present invention;

[0041] Figure 10 This is a schematic diagram of the structure of the positioning sleeve provided by the present invention. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to specific examples and the accompanying drawings.

[0043] It should be noted that all uses of "first" and "second" in the embodiments of the present invention are for the purpose of distinguishing two entities or parameters with the same name but different names. It is clear that "first" and "second" are only for the convenience of expression and should not be construed as limiting the embodiments of the present invention. Subsequent embodiments will not explain this in detail.

[0044] To achieve the above objectives, a first aspect of the present invention provides a pulse generator, such as... Figure 1 and Figure 2As shown, the pulse generator specifically includes: a sliding seal top assembly 1, a pump assembly 2, a magnetic shaft self-filtering assembly 3, a generator coil assembly 4, and a swashplate assembly 6. The ends of the sliding seal top assembly 1, pump assembly 2, swashplate assembly 6, magnetic shaft self-filtering assembly 3, and generator coil assembly 4 are connected sequentially. The sliding seal top assembly 1 includes a top housing 10, a top cap 11, a telescopic rod 12, a sliding seal assembly 13, a sliding seal device 14, and a piston 15. The top cap 11 is fixedly connected to the top housing 10. Next, the sliding sealing assembly 13 is fixedly connected to the top cap 11. The side wall of the telescopic rod 12 near the front end abuts against the sliding sealing assembly 13. The end of the telescopic rod 12 is fixedly connected to the front end of the piston 15. The side wall of the piston 15 near the rear end is provided with a groove 151. A first sealing element 152 is provided in the groove 151. The first sealing element 152 abuts against the inner wall of the top housing 10. A sliding channel 18 is formed between the telescopic rod 12 and the inner wall of the top housing 10. The sliding sealing device 14 is placed in the sliding channel 18.

[0045] Furthermore, the top cap 11 is made of precipitation-hardened stainless steel, the top outer shell 10 is made of alloy material, and the telescopic rod 12 is made of non-magnetic stainless steel.

[0046] The pulse generator described above has a passage provided in the top cap 11 and / or the top outer shell 10 near the front end of the telescopic rod, through which the outside of the pulse generator is connected to the sliding channel inside the pulse generator.

[0047] The sliding seal assembly serves as a seal to prevent external mud from entering the pulse generator.

[0048] The piston is made of non-magnetic stainless steel. The first sealing element on the piston is any one of a circular or strip-shaped sealing ring or a strip-shaped sealing ring with an O-ring embedded inside, made of rubber material, which serves as a seal.

[0049] The sliding sealing device is a strip-shaped sealing ring made of rubber, which serves to seal and balance the internal oil pressure of the pulse generator.

[0050] During operation, the piston 15 of the pulse generator reciprocates axially under the action of the pump assembly 2, and the oil pressure inside the pulse generator continues to rise. The sliding sealing device moves axially in the sliding channel as the oil pressure inside the pulse generator changes. The sliding sealing device balances the pressure of the hydraulic oil inside the pulse generator and the external mud pressure, preventing the internal seal of the pulse generator from failing and causing mud to enter.

[0051] The sliding seal assembly and top cap also play a corrective role when the telescopic rod makes axial reciprocating motion, preventing the telescopic rod from tilting during operation, avoiding deformation or even breakage of the telescopic rod, which would cause the pulse generator to malfunction and extend the service life of the pulse generator.

[0052] The telescopic rod of the aforementioned pulse generator is 4.5mm to 5.2mm long, which is shorter than that of traditional long-stroke telescopic rods. Correspondingly, multiple first and second oil injection holes are provided inside the top outer casing near the piston. Hydraulic oil is injected into the pulse generator through the first oil injection hole 16 and the second oil injection hole 17. This shortens the working stroke of the telescopic rod, resulting in a shorter cycle time for a single signal and enhanced signal strength. This allows for the use of downhole parameter measuring instruments to achieve diversified transmission of geological parameters.

[0053] In some implementations, such as Figure 1 As shown, the sliding sealing top assembly 1 also includes a straightening and positioning sleeve 19, which is placed in the sliding channel 18 and fixedly connected to the top housing 10.

[0054] The sliding seal assembly and top cap mainly serve to straighten the front part of the telescopic pole, while the straightening positioning sleeve serves to straighten the rear part of the telescopic pole. The straightening positioning sleeve further enhances the straightening effect of the telescopic pole.

[0055] In some implementations, combined Figure 1 and Figure 3 The magnetic shaft self-filtering assembly 3 includes: a magnetic shaft self-filtering housing and a magnetic shaft self-filtering device 30. The magnetic shaft self-filtering device 30 includes a flow guide body 31, a magnet assembly 32 and a filter screen 33. The flow guide body 31 is hollow in the radial direction. Multiple oil passages 34 are provided between the outer wall of the flow guide body 31 and the inner wall of the flow guide body, allowing the outer wall of the flow guide body and the inner wall of the flow guide body to pass through each other. The filter screen 33 is fixedly connected to the outer wall of the flow guide body 31 corresponding to the position of the oil passage 34.

[0056] The front end of the guide body 31 is connected to the swash plate assembly 6, which is connected to the pump assembly 2. The swash plate assembly 6 rotates in a circular motion under the action of the pump assembly 2, thereby driving the guide body 31 to rotate in a circular motion.

[0057] The guide body 31 is made of precipitation-hardened stainless steel. The filter screen 33 is tightly connected to the rotating guide body 31 through a hot-pressing process. The filter screen assembly filters the oil flowing into the internal cavity of the guide body 31 through the oil passage, avoiding blockage problems such as blockage of the pulse generator internal circuit and control valve caused by the carbonization of hydraulic oil.

[0058] The magnet assembly 32 includes a magnet 321 and a magnet base 322. The magnet 321 is fixedly connected to the magnet base 322, and the magnet base is threadedly connected to the flow guide body, ensuring that the connection between the magnet assembly and the flow guide body is detachable, which facilitates later maintenance.

[0059] In some implementations, such as Figure 3 As shown, the magnetic shaft self-filtering device 30 also includes a wear-resistant sleeve 35, which is fixedly connected to the outer wall of the front end of the flow guide body 31.

[0060] The wear-resistant sleeve 35 is made of precipitation-hardened stainless steel and is tightly connected to the rotating guide body 31 through a hot-pressing process. The wear-resistant sleeve 35 is used to reduce wear on the end of the guide body 31. In cases where the wear-resistant sleeve is severely worn, for example, when the wear exceeds 40% of its own thickness, the wear-resistant sleeve can be replaced without replacing the guide body, thus saving production and maintenance costs.

[0061] In some implementations, such as Figure 4 As shown, the generator coil assembly 4 includes a housing 41, a coil 42, a linkage drive shaft 43, a magnetic core 44, a first bearing 45, and a second bearing 46. The coil 42 is fixedly connected to the housing 41, and the magnetic core 44 is fixedly connected to the linkage drive shaft 43. The position of the magnetic core 44 corresponds to the position of the coil 42. The first bearing 45 and the second bearing 46 abut against the front end and the end end of the linkage drive shaft 43, respectively.

[0062] Coil 42 is a multi-turn coil, consisting of 12 groups of coils, which generate three-phase AC power in 3 groups. The number of coil turns is adjustable and can be set according to the actual application scenario. By increasing the number of coil turns, the output power can be increased.

[0063] Driven by the magnetic shaft self-filtering device 30, the linkage drive shaft 43 and the magnetic core 44 rotate axially. The magnetic core 44 cuts the magnetic lines of force generated by the multi-turn coil to generate electricity, which can simultaneously provide power to the downhole measuring parameter instruments and provide power supply stability. The first bearing 45 and the second bearing 46 are selected as large ball bearings and small ball bearings respectively according to the design requirements. They play a role in lubricating, straightening and reducing resistance in the connection between the generator coil assembly 4 and the magnetic shaft self-filtering device 30, effectively reducing the friction coefficient between the generator coil assembly 4 and the magnetic shaft self-filtering device 30, and making the centering effect of the entire pulse generator better.

[0064] Downhole measurement parameter instruments can simultaneously measure multiple parameters. Due to the shortened stroke of the pulse generator, the cycle period of a single signal is shortened. For example, before the stroke was shortened, the cycle period of a single signal was 3 seconds. After the stroke is shortened, the cycle period of a single signal is 1 second. Therefore, within 3 seconds, three parameters can be measured sequentially by the downhole measurement parameter instrument, ensuring the transmission of diverse geological parameters downhole and enhancing the signal strength of a single signal.

[0065] In some implementations, such as Figure 1 As shown, the pulse generator also includes a linkage device 5, and the end of the flow guide body is connected to the front end of the linkage transmission shaft through the linkage device 5.

[0066] In some implementations, such as Figure 1 As shown, the linkage device 5 includes a first fixing member 51 and a second fixing member 52 fixedly connected to the inner wall of the first fixing member 51. The interiors of the first fixing member 51 and the second fixing member 52 are hollow. The second fixing member 52 is fixedly connected to the end of the guide body 31. The first fixing member 51 is fixedly connected to the front end of the linkage transmission shaft 43, and the first fixing member 51 abuts against the first bearing 45.

[0067] Both the inner walls of the first fixing member 51 and the second fixing member 52 are provided with internal threads. Correspondingly, the ends of the flow guide body 31 and the front end of the linkage drive shaft 43, which are respectively connected to the first fixing member 51 and the second fixing member 52, are provided with external threads. The first fixing member 51 and the linkage drive shaft 43, and the second fixing member 52 and the flow guide body 31 are all connected by engaging internal and external threads. This connection method ensures that the connection between the generator coil assembly 4 and the magnetic shaft self-filtering device 30 is detachable, which is convenient for later maintenance and saves production costs.

[0068] In some implementations, combined Figure 3 , Figure 5 The filter screen 33 includes a support frame 331. The filter screen is fixedly connected to the flow guide body 31 through the support frame 331. The middle part of the support frame 331 is provided with a filter screen body 332. The filter screen body 332 is positioned corresponding to the oil passage 34 and is used to filter the oil flowing into the oil passage.

[0069] In some implementations, such as Figure 1As shown, the top cap 11 is hollow, and the side wall of the top cap is provided with a passage 111 that communicates with the sliding channel. The first end of the top cap 11 has a groove 112 inside. The size of the groove 112 corresponds to the outer diameter of the sliding sealing assembly 13 and is used to accommodate the sliding sealing assembly. The groove 112 is threadedly connected to the sliding sealing assembly 13, which ensures the detachability of the top cap and the sliding sealing assembly, facilitates later maintenance, and allows for the replacement of damaged, severely worn or aged parts, thus saving costs.

[0070] In some implementations, such as Figure 1 As shown, a connecting part 113 is provided at the second end away from the first end of the top cap 11. The connecting part 113 is inserted into the interior of the top outer shell 10 and is threadedly connected to the inner wall of the top outer shell, which ensures the detachability of the top cap and the top outer shell, facilitates later maintenance, and allows for the replacement of damaged, severely worn or aged parts, thus saving costs.

[0071] In some implementations, combined Figure 2 and Figure 6 As shown, the sliding sealing assembly 13 is hollow and includes a mounting part 132 and at least one sliding seal 133 fixed on the inner wall of the mounting part 132. The sliding seal 133 abuts against the telescopic rod. The outer wall of the mounting part 132 is threaded and the mounting part 132 is threadedly connected to the top cap 11.

[0072] The sliding seal 133 can be a strip-shaped sealing ring made of high-temperature resistant rubber material. The mounting part is made of stainless steel or copper material, preferably copper material. The combination of rubber sliding seal and metal mounting part provides sliding sealing for the pulse generator, which extends the service life of the sliding seal assembly, avoids the problem of rubber seal cracking that is very easy to occur when the pulse generator is operated in high-temperature deep well, and improves the reliability of the pulse generator.

[0073] To further enhance the sealing effect of the sliding seal and improve the reliability of the pulse generator, the sliding seal includes a sealing ring with a strip-shaped cross-section. The front end of the sealing ring has a groove facing downwards, and a sealing ring with a corresponding circular cross-section is placed in the groove.

[0074] To further enhance the sealing effect of the first sliding assembly, a groove is provided on the outer wall near the end of the mounting part, and an O-ring 135 is inserted into the groove.

[0075] In some implementations, combined Figure 1 , Figure 6 and Figure 7 As shown, the mounting part 132 is provided with an operating part 134 on the end face near the telescopic rod. The operating part is used to screw the mounting part and the top cap together or apart. Preferably, the outer wall of the operating part is hexagonal and the size conforms to the standard of a hexagonal nut.

[0076] In some implementations, such as Figure 8 As shown, the sliding sealing device 14 includes a sliding base 141, the front end face of the sliding base 141 includes a first groove 142, and an O-ring 143 is provided in the first groove 142.

[0077] In some implementations, such as Figure 8 As shown, the outer wall of the sliding base 141 includes a second groove 144, and a second seal 145 is provided in the second groove 144. The second seal 145 abuts against the inner wall of the top housing 10.

[0078] In some implementations, such as Figure 8 As shown, the inner wall of the sliding base 141 includes a third groove 146, and at least one third seal 147 is provided in the third groove 146, which abuts against the telescopic rod.

[0079] In some implementations, combined Figure 1 and Figure 9 As shown, the sliding seal top assembly 1 also includes a retaining ring 20, which is fixedly connected to the inner wall of the top housing. The front end face of the retaining ring 20 abuts against the rear end face of the straightening positioning sleeve 19 to fix the straightening positioning sleeve 19.

[0080] The position on the inner wall of the top outer casing where the retaining ring is installed has a groove (not shown) corresponding to the size of the retaining ring, and the retaining ring 20 is placed in the groove.

[0081] In some implementations, such as Figure 10 As shown, the front end face of the straightening positioning sleeve 19 is provided with a plurality of protrusions 191, and the end face of the top outer shell opposite to the front end face of the straightening positioning sleeve is provided with holes (not shown) of the same size and number as the protrusions, the holes being used to insert the protrusions 191.

[0082] In some implementations, such as Figure 2 As shown, the front end of the piston 15 includes a groove 151 with an internal thread, and the end of the telescopic rod is provided with an external thread that matches the internal thread. The end of the telescopic rod with the external thread is screwed into the groove 151 with the internal thread to connect the front end of the piston and the end of the telescopic rod. The threaded connection between the piston and the telescopic rod ensures that the piston and the telescopic rod are detachable, which is convenient for later maintenance. Damaged, severely worn or aged parts can be replaced individually, saving costs.

[0083] In some implementations, such as Figure 1As shown, the telescopic rod 12 includes a telescopic rod body 121 and a telescopic rod head 122 that is threadedly connected to the telescopic rod body. The side wall of the telescopic rod body 121 near the front end abuts against the sliding seal assembly 13, and the end of the telescopic rod body 121 is fixedly connected to the front end of the piston 15.

[0084] The telescopic pole body 121 and the telescopic pole head 122 are connected by threads, which ensures the detachability of the telescopic pole body and the telescopic pole head, making it easy to maintain later. Damaged, severely worn or aged parts can be replaced individually, saving costs.

[0085] The above are exemplary embodiments disclosed in this invention. However, it should be noted that various changes and modifications can be made without departing from the scope of the embodiments of this invention as defined by the claims. The functions, steps, and / or actions of the methods according to the disclosed embodiments described herein do not need to be performed in any particular order. The sequence numbers of the disclosed embodiments of this invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments. Furthermore, although the elements disclosed in the embodiments of this invention may be described or claimed individually, they may be understood as multiple unless explicitly limited to a singular number.

[0086] It should be understood that, as used herein, the singular form “a” is intended to include the plural form as well, unless the context clearly supports an exception. It should also be understood that, as used herein, “and / or” refers to any and all possible combinations of one or more of the associated listed items.

[0087] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention (including the claims) is limited to these examples. Within the framework of the invention, technical features of the above embodiments or different embodiments can be combined, and many other variations of different aspects of the invention exist, which are not provided in the details for the sake of brevity. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the invention should be included within the protection scope of the invention.

Claims

1. A pulse generator, characterized in that, include: The system comprises a sliding seal top assembly, a pump assembly, a magnetic shaft self-filtering assembly, a generator coil assembly, and a swashplate. The ends of the sliding seal top assembly, the pump assembly, the swashplate, the magnetic shaft self-filtering assembly, and the generator coil assembly are connected sequentially. The sliding seal top assembly includes a top housing, a top cap, a telescopic rod, a sliding seal assembly, a sliding seal device, and a piston. The top cap is fixedly connected to the top housing, and the sliding seal assembly is fixedly connected to the top cap. The side wall of the telescopic rod near the front end abuts against the sliding seal assembly, and the end of the telescopic rod is fixedly connected to the front end of the piston. The side wall of the piston near the rear end has a groove, and a first sealing element is provided in the groove. The first sealing element abuts against the inner wall of the top housing. A sliding channel is formed between the telescopic rod and the inner wall of the top housing, and the sliding seal device is placed in the sliding channel. The magnetic shaft self-filtering assembly includes a magnetic shaft self-filtering housing and a magnetic shaft self-filtering device placed inside the magnetic shaft self-filtering housing. The magnetic shaft self-filtering device includes a flow guide body, a magnet assembly, and a filter screen. The flow guide body is hollow in the radial direction. Multiple oil passages are provided between the outer wall and the inner wall of the flow guide body, allowing the outer wall and the inner wall of the flow guide body to pass through each other. The filter screen is fixedly connected to the outer wall of the flow guide body corresponding to the position of the oil passage. The top cap is hollow, and the side wall of the top cap has a passage that communicates with the sliding channel. The first end of the top cap has a groove inside, the size of which corresponds to the sliding sealing assembly and is used to accommodate the sliding sealing assembly. The groove is threadedly connected to the sliding sealing assembly. The sliding sealing assembly is hollow and includes a mounting part and at least one sliding seal fixed on the inner wall of the mounting part. The sliding seal abuts against the telescopic rod. The outer wall of the mounting part is threaded, and the mounting part is threadedly connected to the top cap. The telescopic rod includes a telescopic rod body and a telescopic rod head threadedly connected to the telescopic rod body. The side wall of the telescopic rod body near the front end abuts against the sliding seal assembly, and the end of the telescopic rod body is fixedly connected to the front end of the piston.

2. The pulse generator according to claim 1, characterized in that, The sliding sealing top assembly also includes a straightening and positioning sleeve, which is placed in the sliding channel and fixedly connected to the top outer shell.

3. The pulse generator according to claim 1, characterized in that, The magnetic shaft self-filtering device also includes a wear-resistant sleeve, which is fixedly connected to the front end of the flow guide body.

4. The pulse generator according to claim 3, characterized in that, The generator coil assembly includes a housing, a coil, a linkage drive shaft, a magnetic core, a first bearing, and a second bearing. The coil is fixedly connected to the housing, and the magnetic core is fixedly connected to the linkage drive shaft. The position of the magnetic core corresponds to the position of the coil. The first bearing and the second bearing abut against the front end and the end end of the linkage drive shaft, respectively.

5. The pulse generator according to claim 4, characterized in that, It also includes a linkage device, through which the end of the flow guide body is connected to the front end of the linkage drive shaft.

6. The pulse generator according to claim 5, characterized in that, The linkage device includes a first fixing member and a second fixing member fixedly connected to the inner wall of the first fixing member. The interiors of the first fixing member and the second fixing member are hollow. The second fixing member is fixedly connected to the end of the guide body, and the first fixing member is fixedly connected to the front end of the linkage transmission shaft. The first fixing member abuts against the first bearing.

7. The pulse generator according to claim 1, characterized in that, The filter screen includes a support frame, and the filter screen is fixedly connected to the flow guide body through the support frame. The middle part of the support frame is provided with the filter screen body, and the filter screen body is positioned corresponding to the oil passage, and is used to filter the oil flowing into the oil passage.

8. The pulse generator according to claim 1, characterized in that, A connecting part is provided at the second end away from the first end of the top cap. The connecting part is inserted into the interior of the top outer shell and is threadedly connected to the inner wall of the top outer shell.

9. The pulse generator according to claim 1, characterized in that, An operating part is provided on the end face of the mounting part near the telescopic rod. The operating part is used to screw the mounting part and the top cap together or apart.

10. The pulse generator according to claim 1, characterized in that, The sliding sealing device includes a sliding base, and the front end face of the sliding base includes a first groove, in which an O-ring is provided.

11. The pulse generator according to claim 10, characterized in that, The outer wall of the sliding base includes a second groove, and a second seal is provided in the second groove, the second seal abutting against the inner wall of the top outer shell.

12. The pulse generator according to any one of claims 10 or 11, characterized in that, The inner wall of the sliding base includes a third groove, and at least one third seal is provided in the third groove, the third seal abutting against the telescopic rod.

13. The pulse generator according to claim 2, characterized in that, The sliding sealing top assembly also includes a retaining ring, which is fixedly connected to the inner wall of the top housing. The front end face of the retaining ring abuts against the rear end face of the straightening and positioning sleeve to fix the straightening and positioning sleeve.

14. The pulse generator according to any one of claim 2 or 13, characterized in that, The front end face of the straightening and positioning sleeve is provided with multiple protrusions, and the end face of the top outer shell opposite to the front end face of the straightening and positioning sleeve is provided with holes of the same size and number as the protrusions, the holes being used to insert the protrusions.

15. The pulse generator according to claim 1, characterized in that, The piston has a groove with an internal thread at its front end, and the telescopic rod has an external thread that matches the internal thread at its end. The piston and the telescopic rod are connected by engaging the internal thread and the external thread.

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