Rotational speed sensor and rotational speed detection system

Abstract

The embodiment of the application provides a rotating speed sensor and a rotating speed detection system, relates to the technical field of rotating machinery rotating speed measurement, and is used for solving the technical problem that poor contact is prone to occur. The rotating speed sensor comprises: a mounting cavity formed in a shell; a first through hole is formed in the shell; a first lead wire first end is led out from an inner ring of a first coil; a first lead wire tail end is led out from an outer ring of the first coil; a second lead wire first end is led out from an inner ring of a second coil; a second lead wire tail end is led out from an outer ring of the second coil; a coaxial cable is inserted into the first through hole and partially inserted into the mounting cavity; the coaxial cable comprises a cable core wire and a shielding layer; the cable core wire comprises a first section of cable core wire arranged in the mounting cavity; the shielding layer comprises a first section of shielding layer arranged in the mounting cavity; the first lead wire first end and the second lead wire first end are connected with the first section of cable core wire; and the first lead wire tail end and the second lead wire tail end are connected with the first section of shielding layer, so that poor contact of the rotating speed sensor is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of rotating machinery speed measurement, and in particular to a rotating speed sensor and a rotating speed detection system. BACKGROUND

[0002] In nuclear power plants, a large number of rotating machines are used, such as various pump shaft pump system, various large motors, etc., therefore, the rotating speed parameters of the rotating machines need to be monitored to ensure the safe operation of the rotating machines and prevent the rotating machines from overspeeding, so as to cause the damage of the rotating machines.

[0003] The rotating machines used in nuclear power plants are in a long-term radiation irradiation environment, and the measuring system used must meet the safety level of the nuclear power plant. In the related art, there is a rotating speed sensor that can be used in a radiation environment.

[0004] However, in actual use and operation, due to the long-term existence of vibration working conditions and the influence of self-gravity, the sensor is prone to poor contact, which affects the normal measurement of the rotating speed. Therefore, the present application provides a rotating speed sensor and a rotating speed detection system. CONTENT OF THE INVENTION

[0005] The present application provides a rotating speed sensor and a rotating speed detection system to solve the technical problem that the rotating speed sensor is prone to poor contact.

[0006] In order to achieve the above-mentioned purpose, the embodiments of the present application provide the following technical solutions:

[0007] In a first aspect, the embodiments of the present application provide a rotating speed sensor, comprising:

[0008] A shell is formed with a mounting cavity inside, and a first through hole is formed on the shell to communicate the mounting cavity with the space outside the shell;

[0009] A magnetically conductive core is arranged in the mounting cavity, and the magnetically conductive core comprises a first segment core, a second segment core and a third segment core; the first segment core and the second segment core are arranged oppositely and spaced apart, and the third segment core is connected with the first segment core and the second segment core;

[0010] A first winding is sleeved on the first segment core and comprises a first coil, and the inner circle of the first coil leads out a first lead wire head end, and the outer circle of the first coil leads out a first lead wire tail end;

[0011] A second winding is sleeved on the second segment core and comprises a second coil, and the inner circle of the second coil leads out a second lead wire head end, and the outer circle of the second coil leads out a second lead wire tail end;

[0012] A magnetic steel is arranged in the mounting cavity and in contact with the third segment of the core;

[0013] A coaxial cable is inserted into the first through hole and partially inserted into the mounting cavity, the coaxial cable comprising a cable core and a shielding layer; the cable core comprising a first segment of the cable core arranged in the mounting cavity; the shielding layer comprising a first segment of the shielding layer arranged in the mounting cavity;

[0014] The first lead wire head and the second lead wire head are connected with the first segment of the cable core, and the first lead wire tail and the second lead wire tail are connected with the first segment of the shielding layer.

[0015] In some embodiments of the present application, the shell comprises a first support plate arranged in the mounting cavity, and a first groove is formed on the first support plate;

[0016] The coaxial cable is inserted into the first groove and penetrates through the first groove;

[0017] The rotation speed sensor further comprises:

[0018] A first connecting member, two ends of the first connecting member being connected with the first support plate, and the first connecting member limiting the coaxial cable between the first connecting member and the first support plate.

[0019] In some embodiments of the present application, the shell comprises a partition plate, the partition plate separating the mounting cavity into a first mounting cavity and a second mounting cavity, a second through hole being formed on the partition plate and connecting the first mounting cavity and the second mounting cavity;

[0020] The first segment of the cable core and the first segment of the shielding layer are arranged in the first mounting cavity, and the first connecting member and the first support plate are arranged in the second mounting cavity;

[0021] The first mounting cavity is filled with sealant.

[0022] In some embodiments of the present application, further comprising:

[0023] A first wire ring is sleeved on the coaxial cable and arranged in the second through hole, and the first wire ring seals the gap between the second through hole and the coaxial cable.

[0024] In some embodiments of the present application, the shell comprises:

[0025] A first shell comprising a first shell body and a first partition plate, a first cavity being formed in the first shell body, the first partition plate being arranged in the first cavity and separating the first cavity into a first sub-cavity and a second sub-cavity, and a second groove being formed on the first partition plate;

[0026] The second outer shell includes a second housing and a second partition, a second cavity is formed inside the second housing, the second partition is located inside the second cavity and divides the second cavity into a third sub-cavity and a fourth sub-cavity, and a third groove is formed on the second partition.

[0027] The first outer shell and the second outer shell are connected, the first partition and the second partition are in contact to form the partition, the second groove and the third groove form the second through hole, the first sub-cavity and the third sub-cavity form the first mounting cavity, and the second sub-cavity and the fourth sub-cavity form the second mounting cavity.

[0028] In some embodiments of this application, it also includes:

[0029] The second thread loop is sleeved on the coaxial cable and disposed inside the first through hole, and the second thread loop seals the gap between the first through hole and the coaxial cable.

[0030] In some embodiments of this application, the first winding includes a first coil frame, and the first coil includes a first enameled wire, a first inner silicone wire and a first outer silicone wire wound on the first coil frame. The two ends of the first enameled wire are respectively connected to the first inner silicone wire and the first outer silicone wire. The first inner silicone wire leads out from the first lead end, and the first outer silicone wire leads out from the first lead tail end.

[0031] The second winding includes a second coil frame, and the second coil includes a second enameled wire, a second inner silicone wire and a second outer silicone wire wound on the second coil frame. The two ends of the second enameled wire are respectively connected to the second inner silicone wire and the second outer silicone wire. The second inner silicone wire leads out the first end of the second lead and the second outer silicone wire leads out the tail end of the second lead.

[0032] After the first inner silicone wire is connected to the second inner silicone wire, it is connected to the first section of cable core wire. After the first outer silicone wire is connected to the second outer silicone wire, it is connected to the first section of shielding layer.

[0033] In some embodiments of this application, a first support frame and the support column are also included, with the first and second iron core segments disposed on the first support frame and the third iron core segment disposed on the support column.

[0034] In some embodiments of this application, the first iron core segment and the second iron core segment extend along the length direction of the outer shell, the first iron core segment and the second iron core segment are arranged opposite to each other and spaced apart in the width direction of the outer shell, and the third iron core segment is connected to the same side end of the first iron core segment and the second iron core segment in the length direction of the outer shell.

[0035] The magnet includes a first magnet and a second magnet, with the first magnet located on the third iron core and the third iron core located on the second magnet.

[0036] In a first aspect, embodiments of this application provide a speed detection system, including a detector for displaying speed, a connecting box, and the speed sensor described in the claims above;

[0037] The end of the coaxial cable away from the outer casing is connected to the connecting line of the connecting box, and the connecting line of the connecting box is connected to the detector.

[0038] The speed sensor and speed detection system provided in this application have the following technical advantages: A coaxial cable is inserted into a first through hole and partially inserted into the mounting cavity. The coaxial cable includes a cable core and a shielding layer. The cable core includes a first section of cable core disposed within the mounting cavity, and the shielding layer includes a first section of shielding layer disposed within the mounting cavity. The first end of the first lead and the first end of the second lead are connected to the first section of cable core, and the tail ends of the first and second leads are connected to the first section of shielding layer. This allows the coaxial cable to be directly connected to the first coil and the second coil. The coaxial cable is directly inserted into the housing, and the connection points between the first coil and the second coil and the coaxial cable are located inside the housing. This avoids the use of pins and sockets, preventing the pins from enlarging due to the weight of the coaxial cable itself and vibration, thus avoiding poor contact of the speed sensor and affecting the sensor's output signal. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of this application 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 some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0040] Figure 1 This is a schematic diagram of the structure of a speed sensor according to an embodiment of this application;

[0041] Figure 2 This is a partial structural diagram of a speed sensor according to an embodiment of this application;

[0042] Figure 3 This is another partial structural diagram of a speed sensor according to an embodiment of this application;

[0043] Figure 4 This is an exploded view of a partial structure of a speed sensor according to an embodiment of this application;

[0044] Figure 5This is an exploded view of another partial structure of a speed sensor according to an embodiment of this application;

[0045] Figure 6 This is another partial structural diagram of a speed sensor according to an embodiment of this application;

[0046] Figure 7 This is another partial structural diagram of a speed sensor according to an embodiment of this application;

[0047] Figure 8 This is a structural diagram of a speed detection system according to an embodiment of this application.

[0048] Explanation of reference numerals in the attached figures:

[0049] 100: Speed ​​sensor;

[0050] 1: Outer shell;

[0051] 11: Mounting cavity; 111: First mounting cavity; 112: Second mounting cavity;

[0052] 12: First through hole;

[0053] 13: First outer shell; 131: First housing; 1311: First cavity; 1312: Fourth groove; 132: First support plate; 1321: First channel; 133: First partition plate; 1331: Second groove; 134: Third through hole;

[0054] 14: Second outer shell; 141: Second outer shell;

[0055] 15: Partition;

[0056] 16: Second through hole;

[0057] 2: Magnetic core;

[0058] 21: First section of iron core; 22: Second section of iron core; 23: Third section of iron core;

[0059] 31: First winding; 311: First coil; 3111: First lead end; 3112: First lead end; 3113: First enameled wire; 3114: First inner silicone wire; 3115: First outer silicone wire; 312: First coil frame;

[0060] 32: Second winding; 321: Second coil; 3211: First end of second lead; 3212: Last end of second lead; 3213: Second enameled wire; 3214: Second inner silicone wire; 3215: Second outer silicone wire; 322: Second coil frame;

[0061] 4: Magnet; 41: First magnet; 42: Second magnet;

[0062] 5: Coaxial cable; 51: Cable core; 511: First section of cable core; 52: Shielding layer; 521: First section of shielding layer; 53: Insulation layer; 54: Outer sheath;

[0063] 61: First connector; 62: Sealant; 63: First wire ring; 631: First insertion groove; 64: Second wire ring; 641: Second insertion groove; 67: First support frame; 68: Support column; 69: Fixing member; 691: Fixing member hole;

[0064] 700: Connection box. Detailed Implementation

[0065] As described in the background section, the measurement of rotational speed of rotating machinery used in nuclear power plants differs significantly from that of ordinary rotating machinery. Because this machinery is installed within the containment vessel of the nuclear power plant, it operates under long-term radiation exposure, including external radiation such as gamma rays, beta rays, and x-rays, and internal radiation from radioactive floating particles such as protium, deuterium, and tritium. Furthermore, many complex radioactive isotopes are present. Ordinary sensors operating in a radiation environment experience accelerated aging of their components and premature damage. Therefore, sensors used in radiation environments require special design and must possess radiation resistance. The reactor main cooling pumps in pressurized water reactor nuclear power plants, installed within the containment vessel, are located in the core area of ​​the nuclear power plant and are subject to significant nuclear radiation. Therefore, the measurement system used must meet the safety level of the nuclear power plant: IE class. Currently, rotational speed sensors capable of operating in radiation environments exist. However, in actual operation, due to prolonged vibration and the influence of gravity, poor contact can easily occur, affecting the normal measurement of rotational speed.

[0066] To address the aforementioned technical problems, this application proposes a speed sensor, comprising a housing, a magnetic core, a first winding, a second winding, a magnet, and a coaxial cable. A mounting cavity is formed within the housing, and a first through hole is formed on the housing connecting the mounting cavity and the outer space of the housing. The magnetic core is disposed within the mounting cavity and includes a first iron core segment, a second iron core segment, and a third iron core segment; the first and second iron core segments are positioned opposite each other and spaced apart, and the third iron core segment is connected to both the first and second iron core segments. The first winding is sleeved on the first iron core segment and includes a first coil, with a first lead extending from the inner coil and a first lead extending from the outer coil. The second winding is sleeved on the second iron core segment and includes a second coil, with a second lead extending from the inner coil and a second lead extending from the outer coil. The magnet is disposed within the mounting cavity and contacts the third iron core segment. The coaxial cable is inserted into the first through hole and partially inserted into the mounting cavity. The coaxial cable includes a cable core and a shielding layer. The cable core includes a first section of cable core located within the mounting cavity. The shielding layer includes a first section of shielding layer located within the mounting cavity. The first end of the first lead and the first end of the second lead are connected to the first section of cable core, and the tail ends of the first lead and the tail ends of the second lead are connected to the first section of shielding layer. This allows the coaxial cable to be directly connected to the first coil and the second coil. The coaxial cable is directly inserted into the housing. The connection points between the first coil and the second coil and the coaxial cable are located inside the housing. This avoids the use of pins and sockets, preventing the pins from enlarging due to the weight of the coaxial cable itself and vibration, thus avoiding poor contact of the speed sensor and affecting the sensor's output signal.

[0067] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0068] refer to Figure 1 , Figure 2 and Figure 3 This application provides a speed sensor 100. The speed sensor 100 can be used to measure the rotational speed of rotating machinery in a pressurized water reactor nuclear power plant, wherein the rotating machinery can be the reactor main cooling pump.

[0069] The speed sensor 100 includes a housing 1. A mounting cavity 11 is formed inside the housing 1. A first through hole 12 is formed on the housing 1. The first through hole 12 connects the mounting cavity 11 and the external space of the housing 1.

[0070] refer to Figure 3 and Figure 4The speed sensor 100 includes a magnetic core 2, which is disposed within the mounting cavity 11. The magnetic core 2 includes a first iron core 21, a second iron core 22, and a third iron core 23. The first iron core 21 and the second iron core 22 are arranged opposite to each other and spaced apart. The third iron core 23 is connected to the first iron core 21 and the second iron core 22.

[0071] Specifically, the first iron core segment 21 and the second iron core segment 22 extend along a first direction, and are positioned opposite each other and spaced apart along a second direction. The first and second directions are perpendicular. The third iron core segment 23 is connected to the same-side ends of the first iron core segment 21 and the second iron core segment 22 along the first direction. The first direction can be the length direction of the outer casing 1, and the second direction can be the width direction of the outer casing 1.

[0072] refer to Figure 3 , Figure 4 , Figure 5 and Figure 6 The speed sensor 100 includes a first winding 31. The first winding 31 is sleeved on the first iron core 21. The first winding 31 includes a first coil 311. The inner coil of the first coil 311 has a first lead wire end 3111. The outer coil of the first coil 311 has a first lead wire end 3112.

[0073] The first winding 31 includes a first coil bobbin 312. The first coil bobbin 312 is sleeved on the first section of iron core 21. The first coil 311 is wound on the first coil bobbin 312.

[0074] The speed sensor 100 includes a second winding 32. The second winding 32 is sleeved on the second iron core 22. The second winding 32 includes a second coil 321. The inner coil of the second coil 321 has a second lead end 3211. The outer coil of the second coil 321 has a second lead end 3212.

[0075] The second winding 32 includes a second coil bobbin 322. The second coil bobbin 322 is sleeved on the second iron core 22. The second coil 321 is wound on the second coil bobbin 322.

[0076] refer to Figure 3 The speed sensor 100 includes a magnet 4. The magnet 4 is disposed in the mounting cavity 11 and is in contact with the third section of the iron core 23.

[0077] refer to Figure 3 , Figure 6 and Figure 7The speed sensor 100 includes a coaxial cable 5. The coaxial cable 5 is inserted into the first through hole 12, and a portion of the coaxial cable 5 is inserted into the mounting cavity 11. The coaxial cable 5 includes a cable core 51 and a shielding layer 52. The cable core 51 includes a first section of cable core 511. The first section of cable core 511 is disposed within the mounting cavity 11. The shielding layer 52 includes a first section of shielding layer 521. The first section of shielding layer 521 is disposed within the mounting cavity 11.

[0078] The first end 3111 and the second end 3211 of the first lead are connected to the first section of cable core wire 511, and the second end 3112 of the first lead and the second end 3212 of the second lead are connected to the first section of shielding layer 521. This allows the coaxial cable to be directly connected to the first coil and the second coil. The coaxial cable is directly inserted into the housing, and the connection position between the first coil and the second coil and the coaxial cable is located inside the housing. The connection method of pins and sockets is not used to avoid the pins from enlarging the sockets due to the weight of the coaxial cable itself and the influence of vibration, thus avoiding poor contact of the speed sensor and affecting the sensor output signal.

[0079] refer to Figure 7 The coaxial cable 5 also includes an insulation layer 53. The insulation layer 53 can be sleeved between the cable core 51 and the shielding layer 52. The coaxial cable 5 may also include an outer sheath 54. The outer sheath 54 is sleeved on the shielding layer 52.

[0080] In some embodiments, reference Figure 4 The outer casing 1 includes a first support plate 132. The first support plate 132 is located within the mounting cavity 11. A first groove 1321 is formed on the first support plate 132. A coaxial cable 5 is inserted into the first groove 1321 and passes through the first groove 1321.

[0081] refer to Figure 4 The speed sensor 100 includes a first connector 61. Both ends of the first connector 61 are connected to a first support plate 132. The first connector 61 confines the coaxial cable 5 between the first connector 61 and the first support plate 132. The first connector, the first support plate, and the first groove effectively fix the coaxial cable 5, reducing cable movement and preventing its impact on the connection between the first coil, the second coil, and the coaxial cable. This ensures stable connection between the first coil, the second coil, and the coaxial cable, preventing poor contact in the speed sensor.

[0082] The first connector 61 has first connecting holes at both ends. The speed sensor 100 also includes a second connector, which is inserted into the first connecting holes and fixes the first connector and the first support plate together. The second connector can be a screw.

[0083] In some embodiments, reference Figure 3The outer casing 1 includes a partition 15. The partition 15 divides the mounting cavity 11 into a first mounting cavity 111 and a second mounting cavity 112. A second through hole 16 is formed on the partition 15. The second through hole 16 connects the first mounting cavity 111 and the second mounting cavity 112.

[0084] The first cable core 511 and the first shielding layer 521 are located within the first mounting cavity 111. The first connector 61 and the first support plate 132 are located within the second mounting cavity 112. The first mounting cavity 111 is filled with sealant 62, which improves the stability of the connection between the coaxial cable and the first and second coils, reduces the influence of the coaxial cable's own weight and vibration, and avoids poor contact of the speed sensor, thus affecting the sensor's output signal. The sealant can be epoxy sealant.

[0085] In some embodiments, reference Figure 7 The speed sensor 100 includes a first loop 63. The first loop 63 is sleeved on the coaxial cable 5 and disposed within the second through hole 16. The first loop 63 seals the gap between the second through hole 16 and the coaxial cable 5. The first loop provides shock absorption for the coaxial cable and achieves a seal.

[0086] In some embodiments, reference Figure 1 , Figure 2 and Figure 3 The outer casing 1 includes a first outer casing 13 and a second outer casing 14. The first outer casing 13 and the second outer casing 14 are connected to form a mounting cavity 11. Specifically, the first outer casing 13 includes a first housing 131. A first cavity 1311 is formed within the first housing 131. The second outer casing 14 includes a second housing 141. A second cavity is formed within the second housing 141. When the first outer casing 13 and the second outer casing 14 are connected, the first cavity 1311 and the second cavity form the mounting cavity 11.

[0087] In some embodiments, reference Figure 3 The first outer shell 13 includes a first partition 133. The first partition 133 is located within the first cavity 1311. The first partition 133 divides the first cavity 1311 into a first sub-cavity 13111 and a second sub-cavity 13112. A second groove 1331 is formed on the first partition 133.

[0088] The second outer casing 14 includes a second partition. The second partition is located within the second cavity. The second partition divides the second cavity into a third sub-cavity and a fourth sub-cavity. A third groove is formed on the second partition.

[0089] When the first housing 13 and the second housing 14 are connected, the first partition 133 and the second partition contact to form a partition 15, the second groove and the third groove form a second through hole 16, the first sub-cavity 13111 and the third sub-cavity form a first mounting cavity 111, and the second sub-cavity 13112 and the fourth sub-cavity form a second mounting cavity 112. The first housing 13 includes a first support plate 132. The first support plate 132 is located inside the second sub-cavity 13112. The housing includes both a first housing and a second housing, facilitating the assembly of the speed sensor.

[0090] In some embodiments, reference Figure 3 A fourth groove 1312 is formed on the first housing 131, and a fifth groove is formed on the second housing 141. The first outer shell 13 and the second outer shell 14 are connected, and the fourth groove 1312 and the fifth groove form a first through hole 12.

[0091] In some embodiments, a second connection hole is formed on the first housing. A third connection hole is formed on the second housing 141. The speed sensor includes a third connector. The third connector is inserted into the first and second connection holes and connects the first housing and the second housing 141. The third connector may include bolts and nuts.

[0092] In some embodiments, reference Figure 7 The speed sensor 100 includes a second loop 64. The second loop 64 is sleeved on the coaxial cable 5. The second loop 64 is disposed inside the first through hole 12, and the second loop 64 seals the gap between the first through hole 12 and the coaxial cable 5. The second loop can dampen the coaxial cable and achieve a seal.

[0093] In some embodiments, reference Figure 4 The side of the first thread ring 63 has a first insertion groove 631 arranged in a circumferential pattern. The first partition and the second partition are inserted into the first insertion groove 631 to improve the sealing effect.

[0094] refer to Figure 4 The side wall of the second ring 64 has a second insertion groove 641 arranged in a circumferential pattern. The first housing and the second housing 141 are inserted into the second insertion groove to improve the sealing effect.

[0095] In some embodiments, the first coil includes a first enameled wire 3113, a first inner silicone wire 3114, and a first outer silicone wire 3115. The first enameled wire 3113, the first inner silicone wire 3114, and the first outer silicone wire 3115 are wound on the first coil frame. The two ends of the first enameled wire are respectively connected to the first inner silicone wire and the first outer silicone wire. The first inner silicone wire leads out the first lead end, and the first outer silicone wire leads out the first lead tail end.

[0096] The second coil includes a second enameled wire 3213, a second inner silicone wire 3214, and a second outer silicone wire 3215. The second enameled wire, the second inner silicone wire, and the second outer silicone wire are wound on the second coil frame. The two ends of the second enameled wire are connected to the second inner silicone wire and the second outer silicone wire, respectively. The second inner silicone wire leads out from the first end of the second lead, and the second outer silicone wire leads out from the second lead's tail end.

[0097] The first and second enameled wires can be electromagnetic enameled wires, which have the functions of high temperature resistance and radiation resistance.

[0098] The first enameled wire includes a first core. One end of the first core can be wound around the core of the first inner silicone wire, so that one end of the first enameled wire is electrically connected to the first inner silicone wire, and the other end of the first core can be wound around the core of the first outer silicone wire, so that the other end of the first enameled wire is electrically connected to the first outer silicone wire.

[0099] The first wire core is wound around the first inner silicone wire and the first outer silicone wire core to prevent the first wire core from breaking and improve the stability of the speed sensor.

[0100] The second enameled wire includes a second core. One end of the second core can be wound around the core of the second inner silicone wire, so that one end of the second enameled wire is electrically connected to the second inner silicone wire, and the other end of the second core can be wound around the core of the second outer silicone wire, so that the other end of the second enameled wire is electrically connected to the second outer silicone wire.

[0101] The second core is wound around the cores of the second inner silicone wire and the second outer silicone wire to prevent the second core from breaking and improve the stability of the speed sensor.

[0102] After the first inner silicone wire is connected to the second inner silicone wire, it is connected to the first section of cable core wire. After the first outer silicone wire is connected to the second outer silicone wire, it is connected to the first section of shielding layer. Specifically, after the first inner silicone wire is connected to the second inner silicone wire, it is welded to the first section of cable core wire, and after the first outer silicone wire is connected to the second outer silicone wire, it is welded to the first section of shielding layer.

[0103] In some embodiments, reference Figure 4 The speed sensor 100 includes a first support frame 67. A first iron core 21 and a second iron core 22 are disposed on the first support frame 67. A first support surface and a second support surface are formed on the first support frame. The first support surface and the second support surface are arranged along a first direction, and are opposite to each other and spaced apart in a second direction. The first iron core 21 is located on the first support surface, and the second iron core 22 is located on the second support surface.

[0104] In some embodiments, reference Figure 4The speed sensor 100 includes a support column 68. A third iron core 23 is mounted on the support column 68. A third support surface is formed on the support column 68. The third iron core 23 is mounted on the third support surface. A first support frame and a support pillar are provided to facilitate the placement of the magnetic core.

[0105] The outer casing 1 has a first end and a second end that are positioned opposite each other. The first end and the second end are positioned opposite each other in a first direction. The third core segment 23 is located at the end of the first core segment 21 and the second core segment 22 near the second end of the outer casing. The support post 68 is located at the end of the magnetic core 2 near the second end of the outer casing.

[0106] The first through hole 12 is located at the second end of the outer casing. The first support plate 132 is located on the side of the partition 15 near the second end of the outer casing.

[0107] In some embodiments, reference Figure 5 The magnet 4 includes a first magnet 41 and a second magnet 42. The first magnet 41 is located on the third iron core 23. The second magnet 42 is located below the third iron core 23, and the third iron core 23 is located on the second magnet 42.

[0108] In some embodiments, reference Figure 2 and Figure 4 A third through hole 134 is formed on the first outer casing, which connects the mounting cavity and the outer space of the outer casing. Specifically, the third through hole 134 connects the first mounting cavity and the outer space of the outer casing.

[0109] A fourth through hole is formed on the second outer casing, which connects the mounting cavity and the outer space of the outer casing. Specifically, the fourth through hole connects the first mounting cavity and the outer space of the outer casing.

[0110] The speed sensor includes a fixing member 69. One end of the fixing member 69 is inserted into the third through hole, and the fixing member 69 and the third through hole are sealed together by sealant. The other end of the fixing member 69 is inserted into the fourth through hole, and the fixing member 69 and the fourth through hole are sealed together by sealant.

[0111] The fastener 69 has a fastener hole 691 that passes through the fastener, which facilitates the fixing of the speed sensor.

[0112] In some embodiments, the speed sensor 100 operates based on the principle of magnetoresistive variation. The speed sensor 100 consists of a magnetic core 2, a magnet 4, a first winding 31, and a second winding 32 forming a closed magnetic circuit. When the gear rotates with the pump shaft, the tooth tips and troughs of the gear alternately pass through the speed sensor 100. The lower magnetoresistive resistance at the tooth tips increases the magnetic flux in the magnetic circuit, while the higher magnetoresistive resistance at the tooth troughs weakens the magnetic flux. This periodic change in magnetic flux induces an alternating voltage in the first winding 31 and the second winding 32. The amplitude of this voltage is determined by the mounting gap between the speed sensor 100 and the gear, as well as the gear's linear velocity. The voltage frequency is strictly synchronized with the gear's rotational speed, thereby achieving accurate measurement of the gear's rotational speed.

[0113] In some embodiments, reference Figure 8 This application also proposes a speed detection system, which includes a detector for displaying the speed. The speed detection system includes a connection box 700. The speed detection system includes the speed sensor 100 described above.

[0114] The end of the coaxial cable 5 furthest from the outer casing 1 is connected to the connecting wire of the connecting box 700, and the connecting wire of the connecting box 700 is connected to the detector.

[0115] The connection box is wall-mounted and will not vibrate, thus avoiding the pins from enlarging the socket due to its own weight and vibration, and preventing poor contact of the speed sensor system.

[0116] It should be noted that the brief descriptions of terms in this application are only for the convenience of understanding the embodiments described below, and are not intended to limit the embodiments of this application. Unless otherwise stated, these terms should be understood in their ordinary and common meaning.

[0117] Furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover but not exclusively include, for example, a product or device that includes a series of components is not necessarily limited to those that are explicitly listed, but may include other components that are not explicitly listed or that are inherent to such product or device.

[0118] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0119] The terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0120] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0121] Finally, it should be noted that other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein, and is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

Claims

1. A speed sensor, characterized in that, include: The outer casing has a mounting cavity formed inside it, and a first through hole is formed on the outer casing to connect the mounting cavity and the outer space of the outer casing; A magnetic core is disposed within the mounting cavity. The magnetic core includes a first iron core, a second iron core, and a third iron core. The first iron core and the second iron core are arranged opposite to each other and spaced apart. The third iron core is connected to the first iron core and the second iron core. The first winding is sleeved on the first section of the iron core and includes a first coil. The inner coil of the first coil has a first lead end, and the outer coil of the first coil has a first lead end. The second winding is sleeved on the second section of the iron core and includes a second coil. The inner coil of the second coil has a second lead-out end, and the outer coil of the second coil has a second lead-out end. A magnet is disposed within the mounting cavity and in contact with the third section of the iron core; A coaxial cable is inserted into the first through hole and partially inserted into the mounting cavity. The coaxial cable includes a cable core and a shielding layer. The cable core includes a first section of cable core disposed within the mounting cavity. The shielding layer includes a first section of shielding layer disposed within the mounting cavity. The first end of the first lead and the first end of the second lead are connected to the first section of cable core wire, and the tail end of the first lead and the tail end of the second lead are connected to the first section of shielding layer.

2. The speed sensor according to claim 1, characterized in that, The housing includes a first support plate located within the mounting cavity, and a first groove is formed on the first support plate; The coaxial cable is inserted into the first groove and passes through the first groove; The speed sensor also includes: A first connector, the two ends of which are connected to the first support plate, the first connector constrains the coaxial cable between the first connector and the first support plate.

3. The speed sensor according to claim 2, characterized in that, The outer casing includes a partition that divides the mounting cavity into a first mounting cavity and a second mounting cavity. A second through hole is formed on the partition that connects the first mounting cavity and the second mounting cavity. The first section of cable core and the first section of shielding layer are located in the first mounting cavity; the first connector and the first support plate are located in the second mounting cavity; The first mounting cavity is filled with sealant.

4. The speed sensor according to claim 3, characterized in that, Also includes: A first threaded loop is fitted onto the coaxial cable and disposed within the second through hole, and the first threaded loop seals the gap between the second through hole and the coaxial cable.

5. The speed sensor according to claim 3, characterized in that, The outer casing includes: A first outer shell includes a first housing and a first partition plate. A first cavity is formed inside the first housing. The first partition plate is located inside the first cavity and divides the first cavity into a first sub-cavity and a second sub-cavity. A second groove is formed on the first partition plate. The second outer shell includes a second housing and a second partition, a second cavity is formed inside the second housing, the second partition is located inside the second cavity and divides the second cavity into a third sub-cavity and a fourth sub-cavity, and a third groove is formed on the second partition. The first outer shell and the second outer shell are connected, the first partition and the second partition are in contact to form the partition, the second groove and the third groove form the second through hole, the first sub-cavity and the third sub-cavity form the first mounting cavity, and the second sub-cavity and the fourth sub-cavity form the second mounting cavity.

6. The speed sensor according to any one of claims 1-5, characterized in that, Also includes: The second thread loop is sleeved on the coaxial cable and disposed inside the first through hole, and the second thread loop seals the gap between the first through hole and the coaxial cable.

7. The speed sensor according to any one of claims 1-5, characterized in that, The first winding includes a first coil frame, and the first coil includes a first enameled wire, a first inner silicone wire and a first outer silicone wire wound on the first coil frame. The two ends of the first enameled wire are respectively connected to the first inner silicone wire and the first outer silicone wire. The first inner silicone wire leads out from the first lead end, and the first outer silicone wire leads out from the first lead tail end. The second winding includes a second coil frame, and the second coil includes a second enameled wire, a second inner silicone wire and a second outer silicone wire wound on the second coil frame. The two ends of the second enameled wire are respectively connected to the second inner silicone wire and the second outer silicone wire. The second inner silicone wire leads out the first end of the second lead and the second outer silicone wire leads out the tail end of the second lead. After the first inner silicone wire is connected to the second inner silicone wire, it is connected to the first section of cable core wire. After the first outer silicone wire is connected to the second outer silicone wire, it is connected to the first section of shielding layer.

8. The speed sensor according to any one of claims 1-5, characterized in that, It also includes a first support frame and a support column, with the first and second iron core sections mounted on the first support frame and the third iron core section mounted on the support column.

9. The speed sensor according to any one of claims 1-5, characterized in that, The first iron core segment and the second iron core segment extend along the length direction of the outer shell. The first iron core segment and the second iron core segment are arranged opposite to each other and spaced apart in the width direction of the outer shell. The third iron core segment is connected to the first iron core segment and the second iron core segment on the same side in the length direction of the outer shell. The magnet includes a first magnet and a second magnet, with the first magnet located on the third iron core and the third iron core located on the second magnet.

10. A rotational speed detection system, characterized in that, Includes a detector for displaying rotational speed, a connection box, and a rotational speed sensor as described in any one of claims 1-9; The end of the coaxial cable away from the outer casing is connected to the connecting line of the connecting box, and the connecting line of the connecting box is connected to the detector.

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