Dental multi-purpose motor handle

Abstract

The utility model discloses a dental multifunctional motor handle, including motor, motor has: motor casing, the rear end cover center position is protruding a circular accommodating cavity to rear, motor shaft, the tail of motor shaft is equipped with round magnet, and the round magnet is radial magnetization, circuit board, is located the rear of accommodating cavity, and is separated with the cavity wall of accommodating cavity between the round magnet, protection shell and apron, the rear end face of rear end cover, the inside surface of protection shell with apron constitute the protection cavity of accommodating circuit board. The utility model control is more accurate and stable, and can realize lower speed and realize greater torsional force, can satisfy dental implant and dental root canal treatment demand, guarantee the sealing of the bearing room of motor shaft and round magnet, prevent water vapor from infiltrating, avoid cooling gas and motor internal contact.

Description

Technical Field

[0001] This utility model relates to dental medical devices, and in particular to a multi-functional motor handle for dental applications. Background Technology

[0002] Currently, dental motor handpieces have different performance requirements depending on the application. For example, dental implant applications prioritize low speed and high torque, while dental prosthetics and surgery applications prioritize high speed (due to the motor overheating during prolonged operation), and root canal treatment applications prioritize torque and angle control. In existing technology, motor handpieces used for implantation tend to achieve low speed and high torque. When used in surgical procedures (tooth extraction), these handpieces overheat significantly if the operation time is prolonged. Motor handpieces used in surgery and prosthetics tend to achieve high speed and have internal cooling air. However, when using these handpieces for implantation, because the motor is designed to be sensorless and brushless, the rotational speed cannot be kept low, and the torque is insufficient. Even with algorithms, performance remains unsatisfactory at high torque or extremely low speeds. Furthermore, because the motor requires cooling air for heat dissipation, this air can easily enter the motor's interior. When the air source is not dry enough, moisture can accelerate the corrosion of internal parts and is more likely to seep in during sterilization. Utility Model Content

[0003] The purpose of this invention is to provide a multi-functional dental motor handle to solve one or more technical problems existing in the prior art, and at least provide a beneficial option or create conditions.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0005] This utility model provides a multi-functional dental motor handle, including a motor, the motor having:

[0006] The motor housing has a front end that protrudes radially to form a front cover and a rear end that is provided with a rear end cover. Inside, there is a bearing chamber. The center of the rear end cover has a circular receiving cavity protruding rearward.

[0007] The motor shaft is assembled in the bearing chamber at both ends through the front end cover and the rear end cover. The tail end of the motor shaft is provided with a circular magnet, which is radially magnetized. The circular magnet is placed in the receiving cavity and is not in contact with the inner wall of the receiving cavity.

[0008] A circuit board is located behind the receiving cavity and is separated from the circular magnet by the cavity wall. The circuit board is disposed close to the outer side of the cavity wall of the receiving cavity. The circuit board is provided with a magnetic braided chip, which is used to sense the angular position of the motor shaft through the circular magnet.

[0009] The protective shell and the cover plate are provided. The front part of the protective shell is sleeved on the outside of the rear cover. The cover plate covers the end face of the rear part of the protective shell. The rear end face of the rear cover, the inner side of the protective shell and the cover plate form a protective cavity for accommodating the circuit board.

[0010] This technical solution uses a radially magnetized circular magnet fixed at the tail of the motor shaft, and a magnetic chip on the circuit board to sense the angular position of the motor shaft. Compared with traditional sensorless motors, this technical solution provides more precise and stable control with the same rotor and stator, and can achieve lower speed and greater torque. It is suitable for dental implants (applications focusing on low speed and high torque) and root canal treatment (applications focusing on torque and angle control).

[0011] Furthermore, a receiving cavity is provided through the rear end cover to provide installation space for the round magnet located at the tail of the motor shaft. The circuit board and the round magnet are separated by the cavity wall of the receiving cavity, thereby physically isolating the motor shaft and the bearing chamber where the round magnet is located, ensuring the sealing of the bearing chamber where the motor shaft and the round magnet are located, preventing water vapor from seeping in, and avoiding contact between the cooling air and the inside of the motor.

[0012] Furthermore, the circuit board is positioned close to the outer side of the cavity wall of the receiving cavity, that is, on the side of the rear end cover away from the round magnet. The circuit board is positioned in the protective cavity formed by the rear end face of the rear end cover, the inner side of the protective shell, and the cover plate. The cable can pass through the cover plate in a sealed manner and be electrically connected to the circuit board. This arrangement can not only protect the circuit board, but also further prevent cooling gas from seeping into the bearing chamber where the motor shaft and round magnet are located, thus having the characteristics of dual protection.

[0013] To enable the motor handle to achieve high speeds suitable for dental restorations and surgical procedures, as an extension of the above-described solution, the motor handle further includes a housing having:

[0014] The front housing has a connecting plate at its front end, which is fixedly connected to the front end cover. There is an annular gap between the front housing and the motor housing.

[0015] The connecting shell has its front end inserted between the rear part of the motor housing and the rear part of the front housing. The connecting shell blocks the rear of the annular gap, so that the annular gap forms a cooling chamber surrounding the surface of the motor housing.

[0016] The rear shell is fitted onto the outside of the connecting shell and is connected to the front shell.

[0017] This extended solution incorporates a cooling chamber between the front housing and the motor housing for heat dissipation. This allows the cooling air to circulate around the surface covering the motor, effectively removing heat generated during dental motor handpiece applications (prolonged high-speed use) in dental restorations and surgeries. This addresses the compatibility issues of traditional dental motor handpieces designed for dental implants, which are unsuitable for dental restorations and surgeries. This extended solution covers the core aspects of dental implants, root canal treatment, dental restorations, and surgery. Furthermore, the cooling chamber's surrounding of the motor housing surface prevents direct contact between the cooling air and the motor's interior, effectively resolving the high risk of corrosion associated with traditional designs that introduce cooling air into the motor.

[0018] As an extension of the above solution, the connecting shell is equipped with a return air pipe. One end of the return air pipe is located in the cooling chamber, and the other end is located in the return air space between the inner wall of the connecting shell and the outer wall of the protective shell. The cooling air in the cooling chamber flows under the guidance of the return air pipe, effectively preventing heat accumulation caused by local airflow stagnation in the cooling chamber. The return air pipe directs the cooling air to the return air space outside the protective shell. Because the protective shell and cover plate, the rear cover and the motor housing provide double physical isolation for the bearing chamber inside the motor, the cooling air is prevented from contacting the inside of the motor, and the cooling air and water vapor in the return air space are prevented from seeping in.

[0019] As an extension of the above solution, the rear end of the connecting shell is provided with a fixing block facing inward. The fixing block has several pipe holes for assembling and fixing water and gas pipes. The connecting shell is provided with a fixing block and pipe holes, and the inlet end of the water and gas pipe passes through the pipe holes and connects to the connecting seat at the rear, so that the water and gas pipes can be arranged side by side in the axial direction without interfering with each other in the limited space for transporting water and gas forward, thus solving the problem of space conflict of multiple pipes.

[0020] As an extension of the above solution, the water-air pipe includes a cooling air pipe, a water pipe, and an atomizing air pipe. The inlet end of the water-air pipe is assembled and fixed through a pipe hole. The pipe body extends forward from the fixed block position, passes through the connecting shell, and extends into the cooling chamber. The end of the cooling air pipe extends to the front of the cooling chamber and forms an air outlet at the front of the cooling chamber. The outlet ends of the water pipe and the atomizing air pipe pass through the cooling chamber and are assembled and fixed by the front end cover.

[0021] In this extended design, the outlet of the cooling air pipe is located in the front space of the cooling chamber. The cooling air ejected through the outlet flows forward first, then bounces and / or flows circumferentially at the front cover position. The cooling air then flows from the front to the rear, finally exiting through the return air pipe. This flow path of the cooling air covers the surface of the motor, circulating around it to promptly remove heat and improve the motor's heat dissipation efficiency. Furthermore, the cooling air pipe, water pipe, and atomizing air pipe are arranged side-by-side within the effective space between the outer side of the electrode housing and the outer shell, achieving multi-pipe integration while eliminating the risk of cross-contamination.

[0022] As an extension of the above solution, the outlet ends of the water pipe and the atomizing air pipe are provided with a first foolproof connector, and the front end cap is provided with an assembly hole corresponding to the shape of the first foolproof connector. The inlet ends of the water pipe and the atomizing air pipe are provided with a second foolproof connector, and the pipe hole is provided with a shape corresponding to the second foolproof connector. The first and second foolproof connectors play a foolproof role during the assembly of the water and air pipes; if installed incorrectly, they cannot be installed correctly.

[0023] As an extension of the above solution, the water and gas pipe is connected to the pipe hole of the fixing block through a sealing ring. The sealing ring is axially widened and has an elliptical cross-section. Using an axially widened sealing ring with an elliptical cross-section effectively solves the problems of gaps at the connection between the front and rear shells and water and gas leakage caused by cumulative tolerances.

[0024] As an extension of the above solution, a connecting seat is also included, located at the rear of the motor, the connecting seat having:

[0025] The base has a raised platform on its front side and a fixing plate inside. The raised platform has several pin holes and a connecting terminal in each pin hole. One end of the connecting terminal passes through the cover plate and is electrically connected to the circuit board, and the other end passes through the fixing plate and is electrically connected to the rear cable.

[0026] A connecting sleeve is located behind the base and snaps into the base. The side of the connecting sleeve has an opening for the return flow of cooling air.

[0027] This extended solution uses a boss to set pin holes to fix the connection terminals. When the connector is inserted into the rear of the motor, the connection terminals can accurately align with the holes on the cover plate or with the electrical terminals that are already sealed and fixed on the cover plate. At the same time, due to the action of the fixing block and the clearance position, when the connector is inserted into the rear of the motor, the clearance position and the connector housing achieve a foolproof effect through the clearance position and the fixing block, ensuring that the connection terminals on the connector can accurately align with the electrical connection terminals of the motor.

[0028] As an extension of the above solution, a sealing ring is provided between the connecting sleeve and the rear shell. The sealing ring is an axially widened sealing ring with an elliptical cross-section. The sealing ring ensures that the motor, the rear shell structure, and the handle are pressed forward evenly, preventing the rear shell structure from tilting and reducing the risk of water and air leakage.

[0029] As an extension of the above solution, it also includes a hose, the front end of which is provided with a first outer ring opening, the rear port of the connecting sleeve extends inward to form a first inner protrusion, the first inner protrusion is fastened in the first outer ring opening, the middle part of the hose is provided with a second outer ring opening, the rear port of the rear shell extends inward to form a second inner protrusion, the second inner protrusion is fastened in the second outer ring opening, and the front end and the middle inner wall of the hose are also provided with springs.

[0030] In the extended design, the hose is provided with a first outer ring and a second outer ring, which are squeezed by the first inner protrusion and the second inner protrusion to clamp the hose, so that the hose will not be pulled out when pulled outward (backward) by a large external force. This design prevents the hose from detaching under force and improves the connection stability of the hose. The spring can increase the bending radius of the hose and extend the bending life of the hose. Attached Figure Description

[0031] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0032] Figure 1 This is a cross-sectional structural diagram of the motor handle in the embodiment;

[0033] Figure 2 yes Figure 1 A magnified schematic diagram of the local structure at point A;

[0034] Figure 3 This is an exploded structural diagram of the motor handle in the embodiment;

[0035] Figure 4 This is a schematic diagram of the structure of the water and gas pipe, connecting shell, and connecting seat in an embodiment.

[0036] In the attached diagram: 100: motor, 110: motor housing, 120: front cover, 130: rear cover, 131: receiving cavity, 140: motor shaft, 150: round magnet, 160: circuit board, 170: protective sleeve, 180: cover plate;

[0037] 200: Outer shell; 210: Front shell; 211: Connecting plate; 220: Connecting shell; 221: Return air pipe; 222: Fixing block; 230: Rear shell; 231: Sealing ring;

[0038] 300: Water vapor pipe, 310: Cooling vapor pipe, 320: Water pipe, 330: Atomizing vapor pipe, 340: First foolproof connector, 350: Second foolproof connector;

[0039] 400: Connecting seat, 410: Base, 411: Fixing plate, 420: Boss, 421: Pin hole, 430: Clearance, 440: Connecting sleeve, 441: Opening. Detailed Implementation

[0040] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0041] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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 utility model.

[0042] In the description of this utility model, if there are words such as "several", they mean one or more, "multiple" means two or more, "greater than", "less than", "exceeding" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself.

[0043] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0044] Reference Figures 1 to 4 The following are several embodiments of a multi-functional dental motor handle according to this utility model.

[0045] like Figure 1 and Figure 2 As shown, in some embodiments, a dental multi-purpose motor handle includes a motor 100, the motor having:

[0046] The motor housing 110 has a front end that protrudes radially to form a front end cover 120 and a rear end cover 130. The rear end cover 130 has a bearing chamber inside and a circular receiving cavity 131 protruding rearward from the center of the rear end cover 130.

[0047] The motor shaft 140 is assembled in the bearing chamber at both ends through the front end cover 120 and the rear end cover 130. The tail of the motor shaft 110 is provided with a circular magnet 150, which is radially magnetized. The circular magnet 150 is placed in the receiving cavity 131 and is not in contact with the inner wall of the receiving cavity 131.

[0048] The circuit board 160 is located behind the receiving cavity 131 and is separated from the circular magnet 150 by the cavity wall of the receiving cavity 131. The circuit board 160 is disposed close to the outer side of the cavity wall of the receiving cavity 131. The circuit board 160 is provided with a magnetic braiding chip, which is used to sense the angular position of the motor shaft 110 through the circular magnet 150.

[0049] The protective shell 170 and the cover plate 180 are provided. The front part of the protective shell 170 is sleeved on the outside of the rear cover 130, and the cover plate 180 covers the end face of the rear part of the protective shell 170. The rear end face of the rear cover 130, the inner side of the protective shell 170 and the cover plate 180 form a protective cavity for accommodating the circuit board 160.

[0050] This embodiment employs a sensor-controlled brushless motor. A radially magnetized circular magnet is fixed at the tail of the motor shaft, and a magnetic chip is set on the circuit board to sense the angular position of the motor shaft. Compared with traditional sensorless motors, with the same rotor and stator, the sensor-controlled motor in this embodiment provides more precise and stable control, and can achieve lower speeds and greater torque. It is suitable for both dental implants (applications focusing on low speed and high torque) and root canal treatment (applications focusing on torque and angle control).

[0051] Because high-speed dental motor handles require cooling air for heat dissipation, traditional dental motor handles directly introduce cooling air into the motor. When the air source is not dry enough, moisture will accelerate the corrosion of internal parts, and it is also easier for water vapor to seep in during the sterilization process.

[0052] In this embodiment, a receiving cavity is provided by a rear end cover to provide installation space for a circular magnet located at the tail of the motor shaft. The circuit board and the circular magnet are separated by the cavity wall of the receiving cavity, thereby physically isolating the motor shaft and the bearing chamber where the circular magnet is located, ensuring the airtightness of the bearing chamber where the motor shaft and the circular magnet are located, preventing water vapor from seeping in, and avoiding contact between the cooling air and the inside of the motor.

[0053] Furthermore, the circuit board is positioned close to the outer wall of the receiving cavity, specifically on the side of the rear end cover away from the circular magnet. The rear end cover or cavity wall can be made of stainless steel or aluminum alloy, thus not affecting the magnetic operation between the magnetically encoded chip on the circuit board and the circular magnet. The circuit board is housed within the protective cavity formed by the rear end face of the rear end cover, the inner side of the protective shell, and the cover plate. Cables can be electrically connected to the circuit board through the cover plate in a sealed manner. This arrangement not only protects the circuit board but also further prevents cooling gas from seeping into the bearing chamber of the motor shaft and the circular magnet, providing dual protection.

[0054] Those skilled in the art will understand that the magnetic encoder chip is a magnetic angle encoder chip, which can obtain the real-time position of the rotor (motor shaft) by sensing a radially magnetized circular magnet. Its magnetic sensing operation and implementation can be achieved using existing technologies, such as the circular magnet and the magnetic encoder chip being on the same axis. Technicians can set these settings according to actual usage requirements. Therefore, this utility model does not impose any restrictions on the working principle and implementation of the magnetic encoder chip and the circular magnet.

[0055] like Figure 1 and Figure 2 As shown, in some embodiments, the motor handle further includes a housing 200, the housing 200 having:

[0056] The front housing 210 has a connecting plate 211 at its front end. The connecting plate 211 is fixedly connected to the front end cover 120. There is an annular gap between the front housing 210 and the motor housing 110 for cooling air to be introduced for heat dissipation.

[0057] The connecting shell 220 is inserted at its front end between the rear part of the motor housing 110 and the rear part of the front shell 210. The connecting shell 220 blocks the rear of the annular gap, so that the annular gap forms a cooling chamber surrounding the surface of the motor housing 110.

[0058] The rear shell 230 is fitted onto the outside of the connecting shell 220 and is connected to the front shell 210.

[0059] In this embodiment, a cooling chamber is constructed between the front housing and the motor housing to allow cooling air to dissipate heat. This allows the cooling air to circulate around the surface covering the motor, effectively removing the heat generated by the dental motor handle during dental restorations and surgical applications (long-term high-speed use). This solves the compatibility problem of traditional dental motor handles designed for dental implants being unsuitable for dental restorations and surgeries. This embodiment covers the core aspects of dental implants, root canal treatment, dental restorations, and surgery. Furthermore, the cooling chamber's arrangement around the motor housing surface prevents direct contact between the cooling air and the motor's interior, effectively addressing the high risk of corrosion associated with traditional structures that allow cooling air to enter the motor.

[0060] like Figure 1 , Figure 2 and Figure 4 As shown, in some embodiments, the connecting shell 220 is provided with a return air pipe 221, one end of which is disposed in the cooling chamber, and the other end is disposed in the return air space between the inner wall of the connecting shell 220 and the outer wall of the protective shell 170.

[0061] In this embodiment, a return air pipe is provided. The cooling air in the cooling chamber flows under the guidance of the return air pipe, which effectively prevents heat accumulation caused by local airflow stagnation in the cooling chamber. The return air pipe guides the cooling air to the return air space outside the protective shell. Since the protective shell and cover plate, rear cover and motor housing provide double physical isolation for the bearing chamber inside the motor, the cooling air is prevented from contacting the inside of the motor, and the cooling air and water vapor in the return air space are prevented from seeping in.

[0062] like Figure 1 , Figure 2 and Figure 4 As shown, in some embodiments, the rear end of the connecting shell 220 is provided with a fixing block 222 facing inward. The fixing block 222 is provided with a plurality of pipe holes, which are used to assemble and fix the water and gas pipes 300. In this embodiment, the connecting shell is provided with a fixing block and pipe holes. The inlet end of the water and gas pipe passes through the pipe hole and connects to the connecting seat at the rear, so that the water and gas pipes can be arranged side by side in the axial direction and do not interfere with each other in the limited space for transporting water and gas forward, thus solving the problem of space conflict of multiple pipes.

[0063] In some specific embodiments, such as Figure 4 As shown, the rear inner wall of the connecting shell 220 is connected to the outer wall of the protrusion 420 of the connecting seat 400 (which will be described in detail in the following embodiments). The fixing block 222 is set to protrude inward, so that the protrusion 420 of the connecting seat 400 is correspondingly recessed to provide a clearance position 430. The fixing block 222 has a foolproof function when the connecting seat 400 is connected to the cover plate at the rear end of the motor. When the connecting seat 400 is rotated to different positions and inserted into the rear end of the motor, the installation cannot be achieved because the fixing block 222 and the clearance position 430 cannot be matched. The clearance position 430 of the connecting seat 400 needs to be aligned with the fixing block 222 before being inserted into the rear end of the motor along the axial direction. In this way, the pins on the connecting seat can be accurately electrically connected to the terminals of the cover plate.

[0064] like Figure 3 and Figure 4 As shown, in some embodiments, the water-air pipe 300 includes a cooling air pipe 310, a water pipe 320, and an atomizing air pipe 330. The inlet end of the water-air pipe 300 is assembled and fixed through a pipe hole. The pipe body extends forward from the fixed block 222, passes through the connecting shell 220, and extends into the cooling chamber. The end of the cooling air pipe 310 extends to the front of the cooling chamber and forms an air outlet at the front of the cooling chamber. The outlet ends of the water pipe 320 and the atomizing air pipe 330 pass through the cooling chamber and are assembled and fixed by the front end cover 120.

[0065] In this embodiment, the outlet of the cooling air pipe is located in the front space of the cooling chamber. The cooling air ejected through the outlet flows forward first, then bounces and / or flows circumferentially at the front cover position. The cooling air then flows from the front to the rear, finally exiting through the return air pipe. This flow path of the cooling air covers the surface of the motor, circulating around it to promptly remove heat and improve the motor's heat dissipation efficiency. Furthermore, the cooling air pipe, water pipe, and atomizing air pipe are arranged side-by-side within the effective space between the outer side of the electrode housing and the outer shell, achieving multi-pipe integration while eliminating the risk of cross-contamination. Simultaneously, the design of fixing the water and air pipe outlets to the front cover replaces the traditional solution of requiring a complex sealing structure inside the motor handle, simplifying the assembly process.

[0066] like Figure 3 and Figure 4 As shown, in some embodiments, the outlet ends of the water pipe 320 and the atomizing air pipe 330 are provided with a first foolproof connector 340, and the front end cover 120 is provided with an assembly hole corresponding to the shape of the first foolproof connector 340. The inlet ends of the water pipe 320 and the atomizing air pipe 330 are provided with a second foolproof connector 350, and the pipe hole is provided with a shape corresponding to the second foolproof connector 350. In some specific embodiments, the first foolproof connector is set as a semi-circular key shape that is not a complete circle, such as... Figure 3 As shown in the first foolproof connector 340, the front end cover is correspondingly provided with a semi-circular key-shaped assembly hole for connecting and fixing the outlet ends of the water pipe and the atomizing air pipe. The second foolproof connector 350 is a complete circle. In this embodiment, the first and second foolproof connectors play a foolproof role during the assembly of the water and air pipes; if installed incorrectly, they cannot be installed in place.

[0067] like Figure 4 As shown, in some embodiments, the water and gas pipe 300 is connected to the pipe hole of the fixing block 222 through a sealing ring, and the sealing ring is an axially widened sealing ring with an elliptical cross section.

[0068] In this embodiment, due to the cumulative tolerances of the internal parts of the motor and the rear housing, in order to ensure that the rear housing and the front housing are tightened without gaps, to ensure that the motor does not loosen or be excessively compressed, and to prevent water and air leakage, the sealing ring needs to withstand a larger preload axially. If a conventional O-ring is used, a larger wire diameter is required, which is not feasible in terms of space. In this embodiment, an axially widened sealing ring with an elliptical cross-section is used, which can effectively solve the problems of gaps between the front and rear housings and water and air leakage caused by cumulative tolerances.

[0069] like Figures 1-4 As shown, in some embodiments, the motor handle further includes a connecting seat 400 disposed behind the motor 100, the connecting seat 400 having:

[0070] The base 410 has a boss 420 protruding from its front side. A fixing plate 411 is provided inside the base 410. The boss 420 has a plurality of pin holes 421. A connecting terminal is provided in the pin holes 421. One end of the connecting terminal passes through the cover plate 180 and is electrically connected to the circuit board 160. The other end passes through the fixing plate 411 and is electrically connected to the rear cable.

[0071] A connecting sleeve 440 is located behind the base 410 and engages with the base 410. The side of the connecting sleeve 440 is provided with an opening 441 for the return flow of cooling air.

[0072] In this embodiment, a boss is used to set the pin hole to fix the connection terminal. When the connector is inserted into the rear of the motor, the connection terminal can accurately align with the hole on the cover plate or the electrical terminal that has been sealed and fixed on the cover plate. At the same time, due to the action of the fixing block and the clearance position, when the connector is inserted into the rear of the motor, the clearance position and the connector shell achieve a foolproof effect through the clearance position and the fixing block, ensuring that the connection terminal on the connector can accurately align with the electrical connection terminal of the motor.

[0073] To better understand and further explain the return air path of this utility model, the cooling air from the cooling chamber enters the return air space inside the connecting shell through the return air pipe. This return air space is an annular space formed by the inner side of the connecting shell and the outer side of the protective sleeve. There is a gap between the cover plate behind the motor and the boss of the connecting seat. This gap is located behind the return air space and is connected to it. Thus, the cooling air in the return air space can flow radially in this gap, that is, the cooling air is located in the space between the rear of the motor and the front of the boss of the connecting seat. At this time, the cooling air can flow through the clearance space to the gap between the base and the rear shell (the outer side of the base and the inner side of the rear cover are not in contact). After passing through this gap, the cooling air can flow through the opening of the connecting sleeve to the hose or the rear. In some specific embodiments, the inner side of the connecting shell has an arc-shaped wall at the corresponding return air pipe outlet position, so that the arc-shaped wall and the outer side of the base form a main return air channel. The cooling air flowing out from the return air pipe outlet can directly pass over the base through this main return air channel and flow to the rear.

[0074] It should be noted that the return air path of this utility model can also be implemented in other forms, and this utility model does not impose any restrictions on this. The purpose of this utility model is to ensure that when the cooling air coming out of the cooling chamber through the return air pipe is located behind the motor, due to the double physical isolation of the cover plate, protective sleeve, and rear end cover, the motor can achieve high-speed dental surgical applications and low-speed, high-torque dental implant applications through the round magnet and the magnetic chip of the circuit board, while ensuring the electrical connection and normal operation of the circuit board. On this basis, the cooling air behind the motor is prevented from entering the motor.

[0075] like Figure 2 and Figure 3 As shown, in some embodiments, a sealing ring 231 is provided between the connecting sleeve 440 and the rear shell 230. The sealing ring 231 is a sealing ring that is widened in the axial direction and has an elliptical cross section.

[0076] In this embodiment, an additional sealing ring or gasket is added between the connecting sleeve and the rear shell to ensure that the motor, the rear shell structure, and the handle are pressed forward evenly, preventing the rear shell structure from tilting and reducing the risk of water and air leakage.

[0077] like Figure 1 and Figure 2 As shown, in some embodiments, the motor handle further includes a hose 500, the front end of which is provided with a first outer ring opening 510, the rear port of the connecting sleeve 440 extends inward to form a first inner protrusion 442, the first inner protrusion 442 is fastened in the first outer ring opening 510, the middle part of the hose 500 is provided with a second outer ring opening 520, the rear port of the rear shell 230 extends inward to form a second inner protrusion 232, the second inner protrusion 232 is fastened in the second outer ring opening 520, and the front end and the middle inner wall of the hose 500 are also provided with springs 530.

[0078] In this embodiment, the flexible hose is provided with a first outer ring and a second outer ring, which are used to squeeze the hose together by the first inner protrusion and the second inner protrusion, thus securing the hose and preventing it from being pulled outwards (backwards) by a large external force. This design prevents the hose from detaching under force and improves the connection stability of the hose. The spring can increase the bending radius of the hose and extend its bending life. In some specific embodiments, the wires inside the hose are made of cable, which provides better protection for the wire core. Using cable also facilitates threading the wires inside the hose and improves manufacturing efficiency.

[0079] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the described embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A multi-functional dental motor handle, characterized in that, Includes a motor (100), said motor (100) having: The motor housing (110) has a front end cover (120) that protrudes radially at the front end and a rear end cover (130) at the rear end. The rear end cover (130) has a bearing chamber inside and a circular receiving cavity (131) protruding rearward from the center of the rear end cover (130). The motor shaft (140) is assembled in the bearing chamber at both ends through the front end cover (120) and the rear end cover (130). The tail of the motor shaft (140) is provided with a round magnet (150). The round magnet (150) is radially magnetized. The round magnet (150) is placed in the receiving cavity (131) and is not in contact with the inner wall of the receiving cavity (131). A circuit board (160) is located behind the receiving cavity (131) and separated from the circular magnet (150) by the cavity wall of the receiving cavity (131). The circuit board (160) is disposed close to the outer side of the cavity wall of the receiving cavity (131). A magnetic braided chip is provided on the circuit board (160). The magnetic braided chip is used to sense the angular position of the motor shaft (140) through the circular magnet (150). The protective shell (170) and the cover plate (180) are provided. The front part of the protective shell (170) is sleeved on the outside of the rear cover (130). The cover plate (180) covers the end face of the rear part of the protective shell (170). The rear end face of the rear cover (130), the inner side of the protective shell (170) and the cover plate (180) form a protective cavity for accommodating the circuit board (160).

2. The dental multi-purpose motor handle according to claim 1, characterized in that, It also includes a housing (200) having: The front housing (210) has a connecting plate (211) at its front end. The connecting plate (211) is fixedly connected to the front end cover (120). There is an annular gap between the front housing (210) and the motor housing (110). The connecting shell (220) is inserted at its front end between the rear part of the motor housing (110) and the rear part of the front shell (210). The connecting shell (220) blocks the rear of the annular gap, so that the annular gap forms a cooling chamber surrounding the surface of the motor housing (110). The rear shell (230) is fitted onto the outside of the connecting shell (220) and is connected to the front shell (210).

3. A dental multi-purpose motor handle according to claim 2, characterized in that, The connecting shell (220) is provided with a return air pipe (221). One end of the return air pipe (221) is located in the cooling chamber, and the other end is provided as a return air space between the inner wall of the connecting shell (220) and the outer wall of the protective shell (170).

4. A dental multi-purpose motor handle according to claim 2, characterized in that, The rear end of the connecting shell (220) is provided with a fixing block (222) facing inward. The fixing block (222) is provided with a plurality of pipe holes, which are used to assemble and fix the water and gas pipe (300).

5. A dental multi-purpose motor handle according to claim 4, characterized in that: The water-air pipe (300) includes a cooling pipe (310), a water pipe (320), and an atomizing pipe (330). The inlet end of the water-air pipe (300) is fixed through a pipe hole. The pipe body extends forward from the fixed block (222), passes through the connecting shell (220), and extends into the cooling chamber. The end of the cooling pipe (310) extends to the front of the cooling chamber and forms an air outlet at the front of the cooling chamber. The outlet ends of the water pipe (320) and the atomizing pipe (330) pass through the cooling chamber and are fixed by the front cover (120).

6. A dental multi-purpose motor handle according to claim 5, characterized in that: The outlet ends of the water pipe (320) and the atomizing air pipe (330) are provided with a first anti-foolproof connector (340), and the front end cover (120) is provided with an assembly hole corresponding to the shape of the first anti-foolproof connector (340). The inlet ends of the water pipe (320) and the atomizing air pipe (330) are provided with a second anti-foolproof connector (350), and the pipe hole is provided with a shape corresponding to the second anti-foolproof connector (350).

7. A dental multi-purpose motor handle according to claim 4, characterized in that: The water and gas pipe (300) is connected to the pipe hole of the fixing block (222) through a sealing ring. The sealing ring is an axially widened sealing ring with an elliptical cross section.

8. A dental multi-purpose motor handle according to claim 2, characterized in that: It also includes a connector (400) disposed behind the motor (100), the connector (400) having: The base (410) has a boss (420) protruding on its front side. The base (410) has a fixing plate (411) inside. The boss (420) has a plurality of pin holes (421). The pin holes (421) have connecting terminals. One end of the connecting terminal passes through the cover plate (180) and is electrically connected to the circuit board (160). The other end passes through the fixing plate (411) and is electrically connected to the rear cable. A connecting sleeve (440) is located behind the base (410) and engages with the base (410). The side of the connecting sleeve (440) is provided with an opening (441) for the return flow of cooling air.

9. A dental multi-purpose motor handle according to claim 8, characterized in that: A sealing ring (231) is provided between the connecting sleeve (440) and the rear shell (230). The sealing ring (231) is a sealing ring (231) that is widened in the axial direction and has an elliptical cross section.

10. A dental multi-purpose motor handle according to claim 8, characterized in that: It also includes a hose (500), the front end of which is provided with a first outer ring opening (510), the rear port of the connecting sleeve (440) extends inward to form a first inner protrusion (442), the first inner protrusion (442) is fastened in the first outer ring opening (510), the middle part of the hose (500) is provided with a second outer ring opening (520), the rear port of the rear shell (230) extends inward to form a second inner protrusion (232), the second inner protrusion (232) is fastened in the second outer ring opening (520), and the front end and the middle inner wall of the hose (500) are also provided with springs (530).

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