Coaxial fan speed control device, method and motor

Abstract

The present invention relates to a coaxial fan speed control device, method, and motor. The coaxial fan speed control device includes a housing, a plunger cylinder, an oil distribution plate, a plunger, a plunger swash plate, an adjusting plug, a hydraulic motor, an oil tank, a power end shaft, and a drive end shaft. The oil suction port of the oil distribution plate is connected to the oil outlet of the oil tank. The oil outlet of the oil distribution plate is connected to the oil inlet of the hydraulic motor and the pressure oil chamber of the adjusting plug. The oil outlet of the hydraulic motor is connected to the oil inlet of the oil tank. The spring and the pressure oil in the pressure oil chamber of the adjusting plug respectively exert opposite forces on the adjusting plug. The coaxial fan speed control device, method, and motor provided by the present invention can solve the problem that existing self-cooled motors have insufficient heat dissipation capacity at low speeds and are limited by fan performance at high speeds.

Description

Technical Field

[0001] The present invention relates to the technical field of motor cooling, and in particular to a coaxial fan speed-regulating device, a coaxial fan speed-regulating method, and a motor comprising the coaxial fan speed-regulating device. Background Art

[0002] Existing motor cooling methods can be divided into liquid cooling and air cooling based on the cooling medium. Liquid cooling is mainly water cooling, and air cooling is mainly air cooling. Air cooling can be divided into forced air cooling and self-air cooling. Figure 1 As shown, forced air cooling, as the name implies, is powered by an external fan 3' to drive air to cool the motor 4'. Figure 2 As shown, in self-air cooling, fan blades are generally installed at the tail of the motor, and the fan blades are driven to rotate by the self-rotation of the motor shaft, thereby cooling the motor.

[0003] like Figure 2 As shown, a conventional self-cooled motor cooling fan 1' is mounted directly on the end of the motor's rotating shaft 2'. The fan 1' rotates at the same speed as the motor. As the motor speed changes, the fan 1''s speed changes accordingly. At low motor speeds, the fan 1''s speed decreases, reducing the motor's heat dissipation capacity. At high motor speeds, the fan 1''s speed increases. However, due to the inherent strength of the fan 1', excessively high speeds can damage the fan, thus limiting the motor's maximum speed. Summary of the Invention

[0004] The object of the present invention is to provide a coaxial fan speed control device, which can solve the problem that the existing self-air-cooled motor has insufficient heat dissipation capacity at low speed and is limited by the fan performance at high speed.

[0005] In order to achieve the above-mentioned purpose, on the one hand, the present invention provides a coaxial fan speed control device, including a housing, a plunger cylinder, a plunger, a plunger swash plate, an oil distribution plate, an adjusting plug, a hydraulic motor, an oil tank, a power end shaft and a drive end shaft, wherein a first cavity, a second cavity and a third cavity are provided in the housing, the plunger cylinder is rotatably mounted in the first cavity, one end of the plunger is mounted in the plunger cavity of the plunger cylinder, and the other end is connected to the plunger swash plate, the oil distribution plate is mounted at the end of the plunger cylinder, the power end shaft is rotatably mounted on the housing, and the power end shaft is transmission-connected to the plunger cylinder. The hydraulic motor is installed in the second cavity, the regulating plug is installed in the third cavity, the regulating plug is transmission-connected to the plunger swash plate, the oil tank is installed on the housing, the oil suction port of the oil distribution plate is connected with the oil outlet of the oil tank, the oil outlet of the oil distribution plate is connected with the oil inlet of the hydraulic motor and the pressure oil chamber of the regulating plug, the oil outlet of the hydraulic motor is connected with the oil inlet of the oil tank, the pressure oil in the pressure oil chamber of the spring and the regulating plug respectively exerts opposite forces on the regulating plug, and the drive end shaft is transmission-connected to the rotating shaft of the hydraulic motor.

[0006] In one embodiment, the coaxial fan speed control device further includes an adjusting member, which is capable of adjusting the force exerted by the adjusting plug on the plunger swash plate, thereby adjusting the inclination angle of the plunger swash plate.

[0007] In one embodiment, the adjusting member includes an adjusting bolt, the adjusting plug is connected to the plunger swash plate through a pushing member and a shift rod, the two ends of the pushing member are respectively connected to the adjusting plug and the shift rod, the shift rod is connected to the plunger swash plate to adjust the inclination angle of the plunger swash plate, the adjusting bolt is installed on the housing, the spring connects the adjusting bolt and the shift rod, the adjusting bolt can adjust the elastic force of the spring, the spring can drive the shift rod to move to one side, and the pushing member can drive the shift rod to move to the other side.

[0008] In one embodiment, the spring is connected to the first spring seat, and the adjusting bolt is connected to one end of the first spring seat through the adjusting seat. The first spring seat is arranged along the axial direction of the plunger cylinder, and the adjusting bolt is arranged along the radial direction of the plunger cylinder. One end of the first spring seat has a first inclined surface, and the adjusting seat has a second inclined surface. The first inclined surface is in sliding contact with the second inclined surface. Rotating the adjusting bolt can drive the adjusting seat to move along the radial direction of the plunger cylinder, thereby driving the first spring seat to move along the axial direction of the plunger cylinder, so that the spring is compressed or extended.

[0009] In one embodiment, the other end of the spring is connected to a second spring seat, and the second spring seat is connected to the shifting rod.

[0010] In one embodiment, the oil outlet of the oil distribution plate is connected to the oil inlet of the hydraulic motor and the pressure oil chamber of the regulating plug through a three-way pipe.

[0011] In one embodiment, the oil tank is mounted at the lower end of the housing.

[0012] The present invention differs from the prior art in that the coaxial fan speed control device provided by the present invention uses hydraulic energy to adjust the transmission between the motor and the fan, thereby maintaining a constant fan speed. Specifically, a plunger variable pump composed of a plunger cylinder, a plunger, an oil distribution plate, and a plunger swash plate generates high-pressure oil. The high-pressure oil generated by the plunger variable pump is used to adjust the inclination angle of the plunger swash plate via an adjusting plunger, thereby enabling the plunger variable pump to output high-pressure oil with constant pressure and flow. The regulated high-pressure oil then drives the hydraulic motor to rotate. Therefore, even if the speed of the motor shaft connected to the power-end shaft of the coaxial fan speed control device changes, the speed output by the drive-end shaft of the coaxial fan speed control device is fixed, and the speed of the fan connected to the drive-end shaft is also fixed. Therefore, when the motor shaft speed is low, the fan speed remains constant, and the motor's heat dissipation capacity remains unchanged. When the motor shaft speed is high, the fan speed remains constant, preventing the motor shaft speed from being too high and potentially damaging the fan. Consequently, the fan's performance is not limited by the motor's maximum speed. Therefore, the coaxial fan speed control device provided by the present invention can solve the problem that the existing self-air-cooled motor has insufficient heat dissipation capacity at low speed and is limited by the fan performance at high speed.

[0013] The present invention also provides a coaxial fan constant speed device, including a hydraulic pump, a hydraulic motor, an oil tank and a pressure regulating component. The power end shaft of the hydraulic pump can be connected to the rotating shaft of the electric motor, and the drive end shaft of the hydraulic motor can be connected to the rotating shaft of the fan. The oil suction port of the hydraulic pump is connected to the oil outlet of the oil tank, the oil outlet of the hydraulic pump is connected to the oil inlet of the hydraulic motor, and the oil outlet of the hydraulic motor is connected to the oil inlet of the oil tank. The pressure regulating component keeps the pressure and flow of the pressure oil output by the hydraulic pump constant.

[0014] On the other hand, the present invention also provides a coaxial fan speed control method, including connecting the electric motor shaft to the power end shaft of the hydraulic pump; connecting the drive end shaft of the hydraulic motor to the rotating shaft of the fan; and the pressure regulating member adjusts the pressure of the pressure oil output by the hydraulic pump so that the pressure and flow of the pressure oil output by the hydraulic pump remain constant, and the pressure oil output by the hydraulic pump drives the hydraulic motor to rotate.

[0015] The coaxial fan constant speed device and method provided by the present invention provide a hydraulic pump, and utilize the rotating shaft of the electric motor to drive the hydraulic pump to operate, thereby generating high-pressure oil; the pressure and flow of the high-pressure oil can be adjusted by a pressure regulating member, so that the hydraulic pump outputs high-pressure oil of required pressure and flow; the adjusted high-pressure oil drives the hydraulic motor to drive the motor cooling fan to rotate; when the pressure and flow of the high-pressure oil driving the hydraulic motor are determined, the speed of the hydraulic motor is also determined. Therefore, the coaxial fan constant speed device and method provided by the present invention can solve the problem that the existing self-cooled electric motor has insufficient heat dissipation capacity at low speed and is limited by the fan performance at high speed.

[0016] Another object of the present invention is to provide a motor with better heat dissipation capability.

[0017] In order to achieve the above object, the technical solution of the present invention is achieved as follows:

[0018] An electric motor comprises a motor shaft, a fan and the above-mentioned coaxial fan speed-regulating device, wherein the coaxial fan speed-regulating device is connected to the motor shaft and the fan.

[0019] The technical advantages of the motor and the above-mentioned coaxial fan speed control device over the existing technology are the same, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and other objects, features and advantages of the exemplary embodiments of the present disclosure will become readily understood by reading the following detailed description with reference to the accompanying drawings. In the accompanying drawings, several embodiments of the present disclosure are shown in an illustrative and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0021] Figure 1 It is a structural diagram of an existing forced air cooling motor;

[0022] Figure 2 It is a structural diagram of an existing self-air-cooled motor;

[0023] Figure 3 1 is a schematic structural diagram of a self-air-cooled motor according to an embodiment of the present invention;

[0024] Figure 4 1 is a schematic structural diagram of a coaxial fan speed control device according to an embodiment of the present invention;

[0025] Figure 5 yes Figure 4 The front view of the coaxial fan speed control device shown;

[0026] Figure 6 yes Figure 4 A cross-sectional schematic diagram of a coaxial fan speed control device is shown;

[0027] Figure 7 yes Figure 6 Enlarged view of point A in the middle;

[0028] Figure 8 is a structural schematic diagram of a coaxial fan speed control device according to another embodiment of the present invention; and

[0029] Figure 9 It is a structural principle diagram of a coaxial fan speed control device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the embodiments described are part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments of the present disclosure, all other embodiments obtained by those skilled in the art without making any creative efforts shall fall within the scope of protection of the present disclosure.

[0031] The specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.

[0032] In the foregoing description of this specification, unless otherwise expressly specified or limited, terms such as "fixed," "mounted," "connected," or "connected" should be understood broadly. For example, the term "connected" can refer to a fixed connection, a removable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediary; or the internal connection between two components or the interaction between two components. Therefore, unless otherwise expressly defined in this specification, those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0033] In the present invention, some directional words are defined. In the absence of any contrary explanation, the directional words used, such as "up, down, left, right", refer to the coaxial fan speed control device provided by the present invention under normal use conditions and are consistent with the attached Figure 5 The up, down, left, and right directions shown in the figure are consistent. "Inside" and "outside" refer to the inside and outside relative to the outline of each component itself. These directional words are used for ease of understanding and do not constitute a limitation on the scope of protection of the present invention.

[0034] In addition, the terms "first" or "second" used in this specification to refer to numbers or ordinal numbers are used for descriptive purposes only and should not be understood as explicitly or implicitly indicating relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this specification, "plurality" means at least two, such as two, three or more, etc., unless otherwise clearly specified.

[0035] Appropriate reference Figure 4-Figure 6 As shown, the coaxial fan speed control device of the basic embodiment provided by the present invention includes a housing 1, a plunger cylinder 2, a plunger 3, a plunger swash plate 4, an oil distribution plate, an adjusting plug 5, a hydraulic motor 6, an oil tank 7, a spring 8, a power end shaft 9 and a drive end shaft 10.

[0036] The housing 1 is generally cylindrical, and a fixing plate 18 is provided at the left end of the housing. The fixing plate 18 is a rectangular plate. Figure 6 As shown, the housing 1 is provided with a first cavity, a second cavity, and a third cavity. In one embodiment, the first cavity is located to the left of the second cavity, and the third cavity is located above the first cavity. The first cavity is used to install the plunger pump consisting of the plunger cylinder 2, oil distribution plate, plunger 3, and plunger swash plate 4; the second cavity is used to install the hydraulic motor 6, and the third cavity is used to install the adjustment plug 5 that controls the tilt angle of the plunger swash plate 4.

[0037] The plunger cylinder 2 is rotatably mounted in the first cavity, one end of the plunger 3 is mounted in the plunger cavity of the plunger cylinder 2, and the other end is connected to the plunger swash plate 4 through a sliding shoe. The plunger pump composed of the plunger cylinder 2, the oil distribution plate, the plunger 3 and the plunger swash plate 4 has the same structure as the existing plunger pump and will not be described in detail here. The power end shaft 9 is rotatably mounted on the housing 1, and the power end shaft 9 is transmission-connected to the plunger cylinder 2. The power end shaft 9 is transmission-connected to the plunger cylinder 2, which means that the power end shaft 9 can be connected to the rotating shaft of the plunger cylinder 2 through a coupling or other connecting parts, or the power end shaft 9 and the rotating shaft of the plunger cylinder 2 are the same shaft. In one embodiment, the power end shaft 9 and the rotating shaft of the plunger pump are the same shaft, and the left end of the power end shaft 9 is rotatably mounted on the left end of the housing 1 through a bearing and extends out of the housing 1.

[0038] The hydraulic motor 6 is mounted in the second cavity, and the drive-end shaft 10 is in transmission connection with the rotating shaft of the hydraulic motor 6. The transmission connection between the drive-end shaft 10 and the rotating shaft of the hydraulic motor 6 means that the drive-end shaft 10 is connected to the rotating shaft of the hydraulic motor 6 via a coupling or other connecting member, or the drive-end shaft 10 and the rotating shaft of the hydraulic motor 6 are the same shaft. In one embodiment, the drive-end shaft 10 and the rotating shaft of the hydraulic motor 6 are the same shaft, and the right end of the drive-end shaft 10 is rotatably mounted on the right end of the housing 1 via a bearing and extends out of the housing 1.

[0039] The regulating plug 5 is installed in the third cavity, and the regulating plug 5 is transmission-connected to the plunger swash plate 4, that is, the inclination angle of the plunger swash plate 4 can be changed by moving the regulating plug 5. The spring 8 and the pressure oil in the pressure oil chamber of the regulating plug 5 respectively exert opposite forces on the regulating plug 5, that is, the spring 8 can push the regulating plug 5 to move in one direction, and the pressure oil in the pressure oil chamber of the regulating plug 5 can push the regulating plug 5 to move in the opposite direction. In one embodiment, the pressure oil chamber of the regulating plug 5 is located at the right end of the regulating plug 5, and the left end of the regulating plug 5 is transmission-connected to the plunger swash plate 4. The spring 8 is arranged at the left end of the regulating plug 5. The spring 8 can be directly connected to the left end of the regulating plug 5, or it can be connected to the left end of the regulating plug 5 through other components.

[0040] The oil tank 7 is mounted on the housing 1. In one embodiment, the oil tank 7 is mounted at the lower end of the housing 1, thereby simplifying the structure of the coaxial fan speed control device and ensuring a sealed structure. The oil tank 7 is located at the right end and lower end of the housing 1, supporting the housing 1 and improving the heat dissipation effect of the coaxial fan speed control device.

[0041] refer to Figure 6 As shown, the oil suction port of the oil distribution plate is connected to the oil outlet of the oil tank 7, the oil outlet of the oil distribution plate is connected to the oil inlet of the hydraulic motor 6 and the pressure oil chamber of the regulating plug 5, and the oil outlet of the hydraulic motor 6 is connected to the oil inlet of the oil tank 7. The oil inlet and oil outlet of the oil tank 7 can be the same oil port or two different oil ports.

[0042] When in use, the coaxial fan speed control device provided by the basic embodiment described above is installed between the motor shaft 19 and the fan 20. The power-end shaft 9 of the coaxial fan speed control device is connected to the motor shaft 19, and the drive-end shaft 10 is connected to the shaft of the fan 20. When the motor is operating, the motor shaft 19 drives the power-end shaft 9 to rotate, which in turn drives the plunger variable pump composed of the plunger cylinder 2, the oil distribution plate, the plunger 3, and the plunger swash plate 4. The plunger variable pump generates high-pressure oil, which is delivered to the oil inlet of the hydraulic motor 6 and the pressure oil chamber of the regulating plug 5, respectively. Driven by the high-pressure oil, the hydraulic motor 6 drives the drive-end shaft 10 to rotate, which in turn drives the fan 20 to rotate, thereby achieving heat dissipation from the motor. Since the position of the regulating plug 5 can be adjusted by the hydraulic oil pressure in the pressure oil chamber and the elastic force of the spring 8, thereby changing the inclination angle of the plunger swash plate 4, the plunger variable pump can output high-pressure oil with constant pressure and flow. Therefore, even if the speed of the motor shaft 19 connected to the power end shaft 9 of the coaxial fan constant speed device changes, since the speed output by the drive end shaft 10 of the coaxial fan constant speed device is fixed, the speed of the fan 20 connected to the drive end shaft 10 is also fixed, so when the speed of the motor shaft 19 is low, the speed of the fan 20 can also remain unchanged, that is, the heat dissipation capacity of the motor remains unchanged; when the speed of the motor shaft 19 is very high, the speed of the fan 20 also remains unchanged, and there will be no situation where the speed of the motor shaft 19 is too high and the fan 20 may be damaged, so that the performance of the fan 20 will not limit the maximum speed of the motor.

[0043] To adjust the speed of the fan 20, in a preferred embodiment of the present invention, the coaxial fan speed control device further includes an adjusting member capable of adjusting the force exerted by the adjusting plug 5 on the plunger swash plate 4, thereby adjusting the inclination angle of the plunger swash plate 4. By changing the inclination angle of the plunger swash plate 4 via the adjusting member, the pressure of the pressure oil output by the plunger variable pump can be changed, thereby controlling the speed of the hydraulic motor 6 and, thus, the speed of the fan 20. In the present invention, the adjusting member can adjust the force exerted by the adjusting plug 5 on the plunger swash plate 4 by having a hydraulic element (e.g., a hydraulic control valve) change the hydraulic oil pressure in the pressure oil chamber of the adjusting plug 5 to adjust the force exerted by the adjusting plug 5 on the plunger swash plate 4, or by changing the elastic force of the spring 8 on the adjusting plug 5 to adjust the force exerted by the adjusting plug 5 on the plunger swash plate 4.

[0044] In a preferred embodiment of the present invention, Figure 6 、 Figure 7As shown, the adjusting member includes an adjusting bolt 11. The adjusting plug 5 is connected to the plunger swash plate 4 via a pusher 12 and a lever 13. The two ends of the pusher 12 are connected to the adjusting plug 5 and the lever 13, respectively. The pusher 12 can be a push rod or other structure capable of transmitting force. The lever 13 is connected to the plunger swash plate 4 to adjust the inclination angle of the plunger swash plate 4.

[0045] The adjusting bolt 11 is mounted on the housing 1 and can be threadedly connected to the housing 1. The spring 8 connects the adjusting bolt 11 and the shifting rod 13. The adjusting bolt 11 can adjust the elastic force of the spring 8. The spring 8 can drive the shifting rod 13 to move to one side, and the pushing member 12 can drive the shifting rod 13 to move to the other side.

[0046] When the speed of the fan 20 needs to be adjusted, the adjusting bolt 11 is adjusted to compress or extend the spring 8, thereby changing the force exerted by the spring 8 on the lever 13. Since the other side of the lever 13 is connected to the pusher 12, the adjusting plug 5 exerts a reverse force on the lever 13 via the pusher 12. When the force exerted by the spring 8 on the lever 13 changes, the position of the lever 13 changes, and the lever 13 drives the plunger swash plate 4 to change its inclination angle, thereby changing the pressure of the output pressure oil output by the plunger variable pump, thereby changing the speed of the fan 20. At the same time, as the lever 13 moves, the forces exerted on the lever 13 by the adjusting plug 5 and the spring 8 by the adjusting plug 5 are balanced again, and the position of the lever 13 remains unchanged.

[0047] In the present invention, the adjusting bolt 11 can be arranged on the housing 1 along the axial direction of the plunger cylinder 2 and at one end of the housing 1 .

[0048] In one embodiment, reference Figure 6 、 Figure 7 As shown, the adjusting bolt 11 is arranged along the radial direction of the plunger cylinder 2. The spring 8 is connected to the first spring seat 14. The adjusting bolt 11 is connected to one end of the first spring seat 14 through the adjusting seat 15. The first spring seat 14 is arranged along the axial direction of the plunger cylinder 2. One end of the first spring seat 14 has a first inclined surface, and the adjusting seat 15 has a second inclined surface. The first inclined surface and the second inclined surface are in sliding contact. Rotating the adjusting bolt 11 can drive the adjusting seat 15 to move along the radial direction of the plunger cylinder 2, thereby driving the first spring seat 14 to move along the axial direction of the plunger cylinder 2, so that the spring 8 is compressed or extended.

[0049] Specifically, if Figure 6As shown, a threaded hole is provided on the upper left side of the housing 1. The threaded hole is arranged along the radial direction of the plunger cylinder 2. An adjustment seat mounting hole is provided at the lower end of the threaded hole. The adjustment seat mounting hole is coaxial with the threaded hole. The adjustment bolt 11 is installed in the threaded hole, and the adjustment seat 15 is installed in the adjustment seat mounting hole. A cavity is provided in the housing 1 for accommodating the first spring seat 14. The right end of the first spring seat 14 is connected to the spring 8. A first inclined surface is provided on the upper left side of the first spring seat 14, with the normal direction of the first inclined surface facing the upper left. The adjustment seat 15 is installed on the upper side of the first spring seat 14. The second inclined surface provided at the lower end of the adjustment seat 15 is in contact with the first inclined surface and can slide on the first inclined surface. The upper end of the adjustment seat 15 is in contact with the adjustment bolt 11.

[0050] When the adjusting bolt 11 is used to adjust the force of the spring 8, the adjusting bolt 11 can be rotated forward, so that the adjusting bolt 11 moves downward, which can push the adjusting seat 15 to move downward accordingly. The second inclined surface of the adjusting seat 15 slides downward on the first inclined surface of the first spring seat 14, pushing the first spring seat 14 to move rightward. The first spring seat 14 pushes the spring 8 to the right, and the spring 8 is compressed; when the adjusting bolt 11 is rotated backward, the adjusting bolt 11 moves upward, and the adjusting seat 15 moves upward under the push of the first spring seat 14. The first spring seat 14 moves to the left, and the spring 8 extends accordingly.

[0051] In the present invention, further preferably, to facilitate the connection between the spring 8 and the detent rod 13, a second spring seat 16 is connected to the other end of the spring 8, and the second spring seat 16 is connected to the detent rod 13. Specifically, the first spring seat 14 and the second spring seat 16 are respectively located at the left and right ends of the spring 8, and the right end of the first spring seat 14 and the left end of the second spring seat 16 are both inserted into the spring 8.

[0052] like Figure 6 As shown, the oil outlet of the oil distribution plate is connected to the oil inlet of the hydraulic motor 6 and the pressure oil chamber of the regulating plug 5 through a three-way pipe 17. By connecting the oil outlet of the oil distribution plate, the oil inlet of the hydraulic motor 6 and the pressure oil chamber of the regulating plug 5 together through the three-way pipe 17, the internal structure of the coaxial fan constant speed device can be made more reasonable and stable. The three-way pipe 17 can be formed by a hole opened inside the shell 1, or the three-way pipe 17 can also adopt an existing three-way pipe. Of course, as needed, the oil outlet of the oil distribution plate can also be connected to the oil inlet of the hydraulic motor 6 and the pressure oil chamber of the regulating plug 5 respectively through pipelines (or holes).

[0053] In the present invention, in order to improve the operating stability of the coaxial fan speed control device, as Figure 8As shown, the outer surface of the housing 1 is further provided with a plurality of heat sinks 23. The heat sinks 23 are in the form of elongated strips and are arranged along the length direction (axial direction) of the housing 1. The plurality of heat sinks 23 are radially arranged along the radial direction of the plunger cylinder 2. A plurality of heat sinks 23 are also provided on the outer surface of the oil tank 7.

[0054] In order to solve the technical problems existing in the prior art, the present invention also provides a coaxial fan speed control device, such as Figure 9 As shown, the coaxial fan speed control device includes a hydraulic pump 21, a hydraulic motor 6, an oil tank 7, and a pressure regulating member 22. The power end shaft of the hydraulic pump 21 can be transmission-connected to the motor shaft 19, and the drive end shaft of the hydraulic motor 6 can be transmission-connected to the rotating shaft of the fan 20. The oil suction port of the hydraulic pump 21 is connected to the oil outlet of the oil tank 7, the oil outlet of the hydraulic pump 21 is connected to the oil inlet of the hydraulic motor 6, and the oil outlet of the hydraulic motor 6 is connected to the oil inlet of the oil tank 7. The pressure regulating member 22 ensures that the pressure and flow of the pressurized oil output by the hydraulic pump 21 remain constant.

[0055] When the above-mentioned coaxial fan constant speed device is in use, the motor shaft 19 is used to drive the hydraulic pump 21 to operate, thereby generating high-pressure oil. The pressure and flow of the high-pressure oil can be adjusted by the pressure regulating member 22, so that the hydraulic pump 21 outputs high-pressure oil of the required pressure and flow; the adjusted high-pressure oil drives the hydraulic motor 6 to operate, thereby driving the cooling fan 20 of the motor to rotate; when the pressure and flow of the high-pressure oil driving the hydraulic motor 6 are determined, the speed of the hydraulic motor 6 is also determined, which can solve the problem that the existing self-cooled motor has insufficient heat dissipation capacity at low speed and is limited by the fan performance at high speed.

[0056] With the same technical concept as the above-mentioned embodiment, the present invention also provides a coaxial fan constant speed method, including connecting the motor shaft 19 with the power end shaft of the hydraulic pump 21; connecting the drive end shaft of the hydraulic motor 6 with the rotating shaft of the fan 20; the pressure regulating member 22 adjusts the pressure of the pressure oil output by the hydraulic pump 21 so that the pressure and flow of the pressure oil output by the hydraulic pump 21 remain constant, and the pressure oil output by the hydraulic pump 21 drives the hydraulic motor 6 to rotate.

[0057] In the present invention, the pressure regulating member 22 may be a regulating valve, and the hydraulic pump 21 may be a variable displacement pump. The regulating valve adjusts the angle of the swash plate of the variable displacement pump. The swash plate 4 changes its tilt angle as the rotational speed of the variable displacement pump's shaft changes, thereby maintaining a constant high-pressure oil pressure output by the variable displacement pump. The pressure regulating member 22 may also employ other structures that maintain a constant pressure and flow rate of the hydraulic oil delivered to the hydraulic motor 6, such as an accumulator and a relief valve.

[0058] The present invention also provides a motor, such as Figure 3 As shown, the motor includes a motor shaft 19, a fan 20, and the coaxial fan speed control device described in the above embodiment, wherein the coaxial fan speed control device is connected to the motor shaft 19 and the fan 20. The motor provided by the present invention, by providing the coaxial fan speed control device, can solve the problems of existing self-cooled motors having insufficient heat dissipation capacity at low speeds and being limited by fan performance at high speeds.

[0059] Although this specification has shown and described a number of embodiments of the present invention, it will be apparent to those skilled in the art that such embodiments are provided by way of example only. Those skilled in the art will conceive of many modifications, changes, and alternatives without departing from the ideas and spirit of the present invention. It should be understood that in practicing the present invention, various alternatives to the embodiments of the present invention described herein may be employed. The appended claims are intended to define the scope of protection of the present invention and therefore cover modular compositions, equivalents, or alternatives within the scope of these claims.

Claims

1. A coaxial fan speed control device, characterized in that , comprising a housing (1), a plunger cylinder (2), a plunger (3), a plunger swash plate (4), an oil distribution plate, an adjusting plug (5), a hydraulic motor (6), an oil tank (7), a spring (8), a power end shaft (9) and a drive end shaft (10), wherein the housing (1) is provided with a first cavity, a second cavity and a third cavity, the plunger cylinder (2) is rotatably mounted in the first cavity, one end of the plunger (3) is mounted in the plunger cavity of the plunger cylinder (2), and the other end is connected to the plunger swash plate (4), the oil distribution plate is mounted at the end of the plunger cylinder (2), the power end shaft (9) is rotatably mounted on the housing (1), the power end shaft (9) is transmission-connected to the plunger cylinder (2), the hydraulic motor The hydraulic cylinder (6) is installed in the second cavity, the regulating plug (5) is installed in the third cavity, the regulating plug (5) is connected to the plunger swash plate (4), the oil tank (7) is installed on the housing (1), the oil suction port of the oil distribution plate is connected to the oil outlet of the oil tank (7), the oil outlet of the oil distribution plate is connected to the oil inlet of the hydraulic motor (6) and the pressure oil chamber of the regulating plug (5), the oil outlet of the hydraulic motor (6) is connected to the oil inlet of the oil tank (7), the spring (8) and the pressure oil in the pressure oil chamber of the regulating plug (5) respectively generate opposite forces on the regulating plug (5), and the drive end shaft (10) is connected to the rotating shaft of the hydraulic motor (6).

2. The coaxial fan speed control device according to claim 1, characterized in that: It also includes an adjusting member, which can adjust the force of the adjusting plug (5) on the plunger swash plate (4), thereby adjusting the inclination angle of the plunger swash plate (4).

3. The coaxial fan speed control device according to claim 2, characterized in that: The adjusting member comprises an adjusting bolt (11), the adjusting plug (5) is connected to the plunger swash plate (4) through a pushing member (12) and a shifting rod (13), the two ends of the pushing member (12) are respectively connected to the adjusting plug (5) and the shifting rod (13), the shifting rod (13) is connected to the plunger swash plate (4) to adjust the inclination angle of the plunger swash plate (4), the adjusting bolt (11) is mounted on the housing (1), the spring (8) connects the adjusting bolt (11) and the shifting rod (13), the adjusting bolt (11) can adjust the elastic force of the spring (8), the spring (8) can drive the shifting rod (13) to move to one side, and the pushing member (12) can drive the shifting rod (13) to move to the other side.

4. The coaxial fan speed control device according to claim 3, characterized in that: The spring (8) is connected to the first spring seat (14), and the adjusting bolt (11) is connected to one end of the first spring seat (14) through the adjusting seat (15). The first spring seat (14) is arranged along the axial direction of the plunger cylinder (2), and the adjusting bolt (11) is arranged along the radial direction of the plunger cylinder (2). One end of the first spring seat (14) has a first inclined surface, and the adjusting seat (15) has a second inclined surface. The first inclined surface and the second inclined surface are in sliding contact. Rotating the adjusting bolt (11) can drive the adjusting seat (15) to move along the radial direction of the plunger cylinder (2), thereby driving the first spring seat (14) to move along the axial direction of the plunger cylinder (2), so that the spring (8) is compressed or extended.

5. The coaxial fan speed control device according to claim 4, characterized in that: The other end of the spring (8) is connected to a second spring seat (16), and the second spring seat (16) is connected to the shifting rod (13).

6. The coaxial fan speed control device according to claim 1, characterized in that: The oil outlet of the oil distribution plate is connected to the oil inlet of the hydraulic motor (6) and the pressure oil chamber of the regulating plug (5) through a three-way pipe (17).

7. The coaxial fan speed control device according to claim 1, characterized in that: The oil tank (7) is mounted on the lower end of the housing (1).

8. An electric motor, characterized in that: The invention comprises a motor shaft (19), a fan (20) and a coaxial fan speed-regulating device according to any one of claims 1 to 7, wherein the coaxial fan speed-regulating device connects the motor shaft (19) and the fan (20).

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