Electro-hydraulic servo valve torque motor for APU fuel regulator

Abstract

The invention provides an electro-hydraulic servo valve torque motor for an APU fuel regulator, and relates to the technical field of electro-hydraulic servo valves with large use temperature ranges in the aerospace field. The electro-hydraulic servo valve torque motor for the APU fuel regulator comprises an electro-hydraulic servo valve body and a torque motor body arranged above the electro-hydraulic servo valve body. According to the invention, the heat exchange coil is arranged in the shell, the working medium of the electro-hydraulic servo valve is introduced for convective heat exchange, a plurality of groups of heat absorption fins are arranged on the inner wall of the shell, and a plurality of groups of heat dissipation fins are arranged on the outer wall of the shell, so that the heat absorption area in the shell and the heat dissipation area outside the shell are increased; working media are introduced into the impeller shell from the oil inlet pipe through the reversing valve, the multiple sets of impeller blades are impacted through the high-flow-speed working media, then the rotating shaft is driven to rotate, the fan is driven to rotate at a high speed, when the fan rotates, external air is sucked from the filter screen and blown to the outside of the shell, and air cooling is conducted on the shell.

Description

Technical Field

[0001] The present invention relates to the technical field of electro-hydraulic servo valves with a wide temperature range in the field of aerospace, and in particular to an electro-hydraulic servo valve torque motor for an APU fuel regulator. Background Art

[0002] The electro-hydraulic servo valve is a key component connecting electrical and hydraulic systems. It converts the input electrical signal into an output pressure / flow signal for electro-hydraulic servo system control. It includes multidisciplinary technologies such as electronics, hydraulics, and control. It has the characteristics of high precision and fast response. It is mainly used in aerospace, ships, and defense equipment, such as vector nozzle systems, rudder control, and other equipment. The electro-hydraulic servo valve for APU fuel regulator is one of the many applications of electro-hydraulic servo valves. During its operation, it often needs to withstand extreme high temperature environments, with temperatures reaching hundreds of degrees Celsius. The material and structural properties of the electro-hydraulic servo valve are prone to change under high temperature conditions, affecting the overall service performance. When the temperature changes, the magnetic materials and air gaps in the torque motor of the electro-hydraulic servo valve will have an impact. Long-term exposure to high temperatures will produce irreversible performance changes, such as demagnetization of the torque motor, changes in the stiffness of the spring tube feedback rod, and seal failure, which will affect the service performance of the electro-hydraulic servo valve.

[0003] To this end, there is a publicly available technology on the market that proposes a self-cooling electro-hydraulic servo valve, including a servo valve body and a torque motor housing; the valve body is also provided with a cooling oil inlet channel and a cooling oil return channel; the outside of the torque motor housing is provided with a torque motor shell, and a gap is provided between the torque motor shell and the torque motor housing to form a cooling chamber; the torque motor housing is provided with an oil inlet hole and an oil return hole; the upper end of the oil inlet hole is connected to the cooling chamber, and the lower end of the oil inlet hole is connected to the cooling oil inlet channel; a throttle is provided between the cooling oil inlet channel and the oil inlet hole; the upper end of the oil return hole is connected to the cooling chamber, and the lower end is connected to the cooling oil return channel. This publicly available technology sets a self-cooling structure on the electro-hydraulic servo valve, directly introduces the working medium of the electro-hydraulic servo valve to flow in the self-cooling structure, isolates the external ambient temperature and the convection heat exchange to remove heat to cool the electro-hydraulic servo valve, reduce the working temperature, and achieve the cooling effect; However, the above-mentioned public technology only relies on introducing the working medium of the electro-hydraulic servo valve to flow in the self-cooling structure to isolate the external ambient temperature and carry away heat through convection heat exchange for cooling. The cooling form is too simple and the cooling effect needs to be improved. In summary, in order to ensure the service performance of the electro-hydraulic servo valve under high temperature conditions, an electro-hydraulic servo valve torque motor for an APU fuel regulator with good cooling effect is needed to achieve good cooling effect while reducing energy consumption and controlling the overall weight of the equipment. Summary of the invention

[0004] 1. Technical issues to be resolved Aiming at the deficiencies of the prior art, the present invention provides an electro-hydraulic servo valve torque motor for an APU fuel regulator, which solves the problems of the single cooling form and general cooling effect of the existing electro-hydraulic servo valve torque motor for an APU fuel regulator.

[0005] (2) Technical solution To achieve the above object, the present invention is realized through the following technical solutions: an electro-hydraulic servo valve torque motor for an APU fuel regulator, including an electro-hydraulic servo valve valve body and a torque motor body arranged above the electro-hydraulic servo valve valve body. The torque motor body is composed of a housing and a motor assembly arranged inside the housing. The housing is composed of a bottom plate and a housing fixedly connected to the upper wall of the bottom plate. An endothermic structure for adsorbing the heat inside the housing and transferring it to the housing is arranged on the inner side wall of the housing. A heat dissipation structure for transferring the heat in the housing to the outside is arranged on the circumferential outer wall of the housing. An installation hole for installing the motor assembly is arranged on the inner wall of the bottom plate. An oil inlet hole and an oil outlet hole that penetrate up and down are arranged on the inner wall of the bottom plate. The oil outlet hole and the oil inlet hole are both located inside the housing under the top view projection and are respectively located on the left and right sides of the installation hole. The oil inlet hole is communicated with the oil inlet flow channel of the electro-hydraulic servo valve valve body, and the oil outlet hole is communicated with the oil return flow channel of the electro-hydraulic servo valve valve body.

[0006] Preferably, an oil inlet pipe communicated with the oil inlet hole is fixedly connected to the upper wall of the bottom plate. An impeller housing is fixedly connected to the middle position of the upper inner side wall of the housing. An outlet pipe and an inlet pipe are respectively fixedly connected to the left and right side walls of the impeller housing. A temperature sensor for detecting the temperature inside the housing is fixedly connected to the lower wall of the impeller housing. A commutation structure is arranged between the oil inlet pipe and the impeller housing. A heat exchange structure is arranged between the end of the outlet pipe far from the impeller housing and the oil outlet hole. A top cover is fixedly connected to the upper wall of the housing. A filtering structure is arranged on the upper wall of the top cover. A rotating shaft is rotatably connected vertically inside the impeller housing. The upper end of the rotating shaft penetrates the upper wall of the housing and extends into the top cover. A driving structure for driving the rotating shaft to rotate is arranged at one end of the rotating shaft located inside the impeller housing. An air cooling structure for blowing air to the housing for cooling is arranged at one end of the rotating shaft located inside the top cover. Sealing structures are arranged between the impeller housing and the upper inner side wall of the housing, between the lower wall of the bottom plate, and between the rotating shaft and the housing.

[0007] Preferably, the endothermic structure includes multiple groups of endothermic fins. Multiple groups of endothermic fins are all arranged on the inner side wall of the housing, and the length directions of multiple groups of endothermic fins are all parallel to the axial direction of the housing.

[0008] Preferably, the heat dissipation structure includes multiple groups of heat dissipation fins. The multiple groups of heat dissipation fins are all arranged on the circumferential outer wall of the housing, and the length directions of the multiple groups of heat dissipation fins are all parallel to the axial direction of the housing. The inner diameter of the end of the top cover facing the housing is larger than the outer diameter of the housing. The top cover is fixedly connected to the upper ends of the multiple groups of heat dissipation fins, and the top cover is fixedly connected to the housing through the multiple groups of heat dissipation fins.

[0009] Preferably, the commutation structure includes a commutation valve, a commutation motor, and a branch pipe. The commutation valve is fixedly connected between the end of the oil inlet pipe far from the oil inlet hole and the end of the inlet pipe far from the impeller housing. One group of inlet holes and two groups of discharge holes are arranged on the commutation valve. The oil inlet pipe communicates with the inlet hole of the commutation valve, and the inlet pipe communicates with one of the two groups of discharge holes of the commutation valve. The branch pipe is fixedly connected between the discharge hole of the commutation valve far from the inlet pipe and the outer wall of the outlet pipe. The commutation motor is fixedly connected to the lower wall of the commutation valve, and the valve core of the commutation valve is driven to rotate by the commutation motor.

[0010] Preferably, the heat exchange structure is a heat exchange coil. The heat exchange coil is fixedly connected between the end of the outlet pipe far from the impeller housing and the oil outlet hole, and the heat exchange coil spirals along the inner side wall of the housing.

[0011] Preferably, the filtering structure is a filter screen. The filter screen is fixedly connected to the upper wall of the top cover.

[0012] Preferably, the driving structure includes multiple groups of impeller blades. The multiple groups of impeller blades are all fixedly connected to the outer wall of the rotating shaft in a circumferentially equally divided manner with the axis of the rotating shaft as the center. The multiple groups of impeller blades are all located inside the impeller housing, and the upper and lower ends of the multiple groups of impeller blades are respectively slidably connected to the inner upper wall of the housing and the inner lower wall of the impeller housing.

[0013] Preferably, the air cooling structure is a fan. The fan is fixedly connected to the outer wall of the end of the rotating shaft extending into the top cover, and the air outlet direction of the fan is towards the top of the housing.

[0014] Preferably, the sealing structure includes two groups of first sealing rings, one group of second sealing rings, and one group of third sealing rings. The two groups of first sealing rings are both arranged on the lower wall of the bottom plate and are respectively located around the oil inlet hole and the oil outlet hole. The second sealing ring is arranged between the impeller housing and the inner upper wall of the housing. The third sealing ring is arranged between the outer wall of the rotating shaft and the inner side wall of the housing.

[0015] (III) Beneficial Effects The present invention provides an electro-hydraulic servo valve torque motor for an APU fuel regulator. It has the following beneficial effects: 1. Compared with the prior art, for the torque motor of the electro-hydraulic servo valve used in the APU fuel regulator, not only is a heat exchange coil arranged inside the housing to conduct convective heat exchange by introducing the working medium of the electro-hydraulic servo valve, but also multiple groups of heat-absorbing fins are arranged on the inner wall of the housing and multiple groups of heat-dissipating fins are arranged on the outer wall of the housing, increasing the heat-absorbing area inside the housing and the heat-dissipating area outside the housing, significantly improving the heat dissipation effect of the torque motor and enhancing the service performance of the electro-hydraulic servo valve.

[0016] 2. Compared with the prior art, for the torque motor of the electro-hydraulic servo valve used in the APU fuel regulator, a temperature sensor is arranged inside the housing. When the temperature cannot be reduced by the forms of convective heat dissipation through the heat exchange coil and heat dissipation to the outside through the heat-absorbing fins and heat-dissipating fins, the reversing motor is started to drive the reversing valve to reverse, and the working medium is introduced from the oil inlet pipe through the reversing valve into the impeller housing. The high-velocity working medium impacts multiple groups of impeller blades, thereby driving the rotation of the rotating shaft and then driving the high-speed rotation of the fan. When the fan rotates, it inhales external air from the filter screen and blows it towards the outside of the housing to cool the housing by air cooling, greatly improving the cooling effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of the overall structure of the present invention; Figure 2 is a partial sectional view of the internal structure of the housing and the top cover of the present invention; Figure 3 For the present invention Figure 2 is a partial enlarged view of part A in; Figure 4 For the present invention Figure 2 is a partial enlarged view of part B in; Figure 5 is a partial sectional view of the internal structure of the housing of the present invention when viewed from the bottom; Figure 6 is a partial sectional view of the internal structure of the impeller housing of the present invention when viewed from the top.

[0018] Among them, 1. bottom plate; 2. housing; 3. heat-dissipating fin; 4. top cover; 5. filter screen; 6. oil inlet hole; 7. oil outlet hole; 8. first sealing ring; 9. oil inlet pipe; 10. reversing valve; 11. reversing motor; 12. branch pipe; 13. impeller housing; 1301. inlet pipe; 1302. outlet pipe; 14. heat exchange coil; 15. second sealing ring; 16. third sealing ring; 17. rotating shaft; 18. fan; 19. impeller blade; 20. heat-absorbing fin; 21. temperature sensor. DETAILED DESCRIPTION OF THE INVENTION

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0020] Embodiment:

[0021] As Figures 1 to 6 shown, an electro-hydraulic servo valve torque motor for an APU fuel regulator provided by an embodiment of the present invention includes an electro-hydraulic servo valve body and a torque motor body disposed above the electro-hydraulic servo valve body. The torque motor body is composed of a housing and a motor assembly disposed inside the housing. The housing is composed of a bottom plate 1 and a housing 2 fixedly connected to the upper wall of the bottom plate 1; In order to increase the contact area between the inside of the housing 2 and the air, a heat absorption structure for adsorbing the heat inside the housing 2 and transferring it to the housing 2 is provided on the inner side wall of the housing 2. The heat absorption structure includes a plurality of heat absorption fins 20. The plurality of heat absorption fins 20 are all disposed on the inner side wall of the housing 2 and the length directions of the plurality of heat absorption fins 20 are all parallel to the axial direction of the housing 2. By means of the plurality of heat absorption fins 20, the contact area between the inside of the housing 2 and the air is increased, and the efficiency of the housing 2 for adsorbing the internal heat is increased; In order to increase the contact area between the outside of the housing 2 and the air, a heat dissipation structure for transferring the heat in the housing 2 to the outside is provided on the circumferential outer wall of the housing 2. The heat dissipation structure includes a plurality of heat dissipation fins 3. The plurality of heat dissipation fins 3 are all disposed on the circumferential outer wall of the housing 2 and the length directions of the plurality of heat dissipation fins 3 are all parallel to the axial direction of the housing 2. The inner diameter of one end of the top cover 4 facing the housing 2 is larger than the outer diameter of the housing 2. The top cover 4 is fixedly connected to the upper ends of the plurality of heat dissipation fins 3. The top cover 4 is fixedly connected to the housing 2 through the plurality of heat dissipation fins 3. By means of the plurality of heat dissipation fins 3, the contact area between the outside of the housing 2 and the air can be increased, so that the heat absorbed by the housing 2 from the inside can be transferred to the surrounding air faster, and the heat dissipation speed is improved; In order to form convective heat dissipation inside the housing 2 by means of the working medium, an installation hole for installing the motor assembly is provided on the inner wall of the bottom plate 1. An oil inlet hole 6 and an oil outlet hole 7 that penetrate up and down are provided on the inner wall of the bottom plate 1. In the top-down projection, both the oil outlet hole 7 and the oil inlet hole 6 are located inside the housing 2 and are respectively located on the left and right sides of the installation hole. The oil inlet hole 6 is communicated with the oil inlet flow channel of the electro-hydraulic servo valve body, and the oil outlet hole 7 is communicated with the oil return flow channel of the electro-hydraulic servo valve body. A feed pipe 9 that penetrates through the oil inlet hole 6 is fixedly connected to the upper wall of the bottom plate 1. An impeller housing 13 is fixedly connected to the upper wall of the inner side of the housing 2 at the central position. An outlet pipe 1302 and an inlet pipe 1301 are respectively fixedly connected to the left and right side walls of the impeller housing 13. A heat exchange structure is provided between the end of the outlet pipe 1302 far from the impeller housing 13 and the oil outlet hole 7. The heat exchange structure is a heat exchange coil 14. The heat exchange coil 14 is fixedly connected between the end of the outlet pipe 1302 far from the impeller housing 13 and the oil outlet hole 7. The heat exchange coil 14 spirals along the inner side wall of the housing 2. The working medium inside the electro-hydraulic servo valve body enters the branch pipe 12 through the feed pipe 9 and then enters the heat exchange coil 14. The heat inside the housing 2 is taken away by the working medium flowing through the spiral heat exchange coil 14 to reduce the temperature inside the housing 2; In order to continue cooling when the temperature inside the housing 2 exceeds the heat dissipation limit of the heat exchange coil 14, the heat absorption fins 20 and the heat dissipation fins 3, a temperature sensor 21 for detecting the temperature inside the housing 2 is fixedly connected to the lower wall of the impeller housing 13. A commutation structure is provided between the feed pipe 9 and the impeller housing 13. The commutation structure includes a commutation valve 10, a commutation motor 11, and a branch pipe 12. The commutation valve 10 is fixedly connected between the end of the feed pipe 9 far from the oil inlet hole 6 and the end of the inlet pipe 1301 far from the impeller housing 13. A set of inlet holes and two sets of outlet holes are provided on the commutation valve 10. The feed pipe 9 communicates with the inlet hole of the commutation valve 10, and the inlet pipe 1301 communicates with one of the two sets of outlet holes of the commutation valve 10. The branch pipe 12 is fixedly connected between the set of outlet holes of the commutation valve 10 far from the inlet pipe 1301 and the outer wall of the outlet pipe 1302. The commutation motor 11 is fixedly connected to the lower wall of the commutation valve 10. The spool of the commutation valve 10 is driven to rotate by the commutation motor 11. During the initial heat dissipation, the working medium flows through the feed pipe 9, the commutation valve 10, the branch pipe 12, and the heat exchange coil 14. When the internal temperature reaches the preset condition, the commutation valve 10 is commutated by the commutation motor 11, and the working medium changes its path and flows through the feed pipe 9, the commutation valve 10, the impeller housing 13, and the heat exchange coil 14 to start the fan 18; In order to filter the air inhaled by the fan 18, a top cover 4 is fixedly connected to the upper wall of the housing 2. A filtering structure is provided on the upper wall of the top cover 4. The filtering structure is a filter net 5. The filter net 5 is fixedly connected to the upper wall of the top cover 4. When the fan 18 works, it inhales external air from the filter net 5, and the air is filtered by the filter net 5 during the inhalation process to prevent dust from adhering to the outer wall of the housing 2 and causing poor heat dissipation; In order to achieve air-cooled cooling, a rotating shaft 17 is vertically rotatably connected inside the impeller housing 13. The upper end of the rotating shaft 17 penetrates the upper wall of the outer housing 2 and extends into the top cover 4. One end of the rotating shaft 17 located inside the impeller housing 13 is provided with a driving structure for driving the rotation of the rotating shaft 17. The driving structure includes multiple groups of impeller blades 19. The multiple groups of impeller blades 19 are all fixedly connected to the outer wall of the rotating shaft 17 in a circumferentially equally divided manner with the axis of the rotating shaft 17 as the center. The multiple groups of impeller blades 19 are all located inside the impeller housing 13, and the upper and lower ends of the multiple groups of impeller blades 19 are respectively slidably connected to the inner upper wall of the outer housing 2 and the inner lower wall of the impeller housing 13. One end of the rotating shaft 17 located inside the top cover 4 is provided with an air-cooling structure for blowing air towards the outer housing 2 for cooling. The air-cooling structure is a fan 18. The fan 18 is fixedly connected to the outer wall of the end of the rotating shaft 17 extending into the top cover 4. The air outlet direction of the fan 18 is towards the top of the outer housing 2. When the working medium passes through the inside of the impeller housing 13, the multiple groups of impeller blades 19 are pushed to rotate along the center of the rotating shaft 17 by the high-speed flowing working medium, thereby driving the continuous rotation of the rotating shaft 17. The rotation of the rotating shaft 17 drives the rotation of the fan 18. When the fan 18 rotates, it sucks in external air from the filter net 5 and blows it towards the top of the outer housing 2, and blows it along the gap between the outer wall of the outer housing 2 and the top cover 4 towards the circumferential outer wall of the outer housing 2, performing air-cooled cooling on the outer housing 2; In order to achieve sealing, sealing structures are provided between the impeller housing 13 and the inner upper wall of the outer housing 2, the lower wall of the bottom plate 1, and between the rotating shaft 17 and the outer housing 2. The sealing structure includes two groups of first sealing rings 8, one group of second sealing rings 15, and one group of third sealing rings 16. The two groups of first sealing rings 8 are both provided on the lower wall of the bottom plate 1 and are respectively located around the oil inlet hole 6 and the oil outlet hole 7. The second sealing ring 15 is provided between the impeller housing 13 and the inner upper wall of the outer housing 2. The third sealing ring 16 is provided between the outer wall of the rotating shaft 17 and the inner wall of the outer housing 2. The sealing at the connection is achieved through the first sealing ring 8, the second sealing ring 15, and the third sealing ring 16 to prevent the leakage of the working medium.

[0022] Working principle: The shell of the torque motor body is composed of a base plate 1 and an outer shell 2 fixedly connected to the upper wall of the base plate 1. The contact area between the inside of the outer shell 2 and the air is increased by multiple sets of heat-absorbing fins 20, and the efficiency of the outer shell 2 in absorbing internal heat is increased. The contact area between the outside of the outer shell 2 and the air can be increased by multiple sets of heat-dissipating fins 3, so that the heat absorbed from the inside of the outer shell 2 can be transferred to the surrounding air faster, thereby improving the heat dissipation speed. The working medium inside the electro-hydraulic servo valve body enters the branch pipe 12 through the oil inlet pipe 9 and then enters the heat exchange coil 14. The working medium flows through the spiral heat exchange coil 14 and takes away the internal heat of the outer shell 2 to reduce the internal temperature of the outer shell 2. During the initial heat dissipation, the working medium circulates through the oil inlet pipe 9, the reversing valve 10, the branch pipe 12, and the heat exchange coil 14. When the internal temperature reaches the preset condition, the reversing valve 10 is reversed by the reversing motor 11, and the working The medium is redirected to flow through the oil inlet pipe 9, the reversing valve 10, the impeller shell 13, and the heat exchange coil 14 to start the fan 18. When the fan 18 is working, external air is inhaled from the filter 5. During the inhalation process, the air is filtered by the filter 5 to prevent dust from adhering to the outer wall of the shell 2 and causing poor heat dissipation. When the working medium passes through the inside of the impeller shell 13, the high-speed flowing working medium pushes the multiple groups of impeller blades 19 to rotate along the center of the rotating shaft 17, thereby driving the rotating shaft 17 to rotate continuously, and the rotation of the rotating shaft 17 drives the fan 18 to rotate. When the fan 18 rotates, it inhales external air from the filter 5 and blows it to the top of the shell 2, and blows it to the circumferential outer wall of the shell 2 along the gap between the outer wall of the shell 2 and the top cover 4, so as to cool the shell 2 with air. The first sealing ring 8, the second sealing ring 15 and the third sealing ring 16 are used to achieve sealing at the connection to prevent leakage of the working medium.

[0023] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An electro-hydraulic servo valve torque motor for an APU fuel regulator, characterized in that: It includes an electro-hydraulic servo valve body and a torque motor body arranged above the electro-hydraulic servo valve body. The torque motor body consists of a housing and a motor assembly arranged inside the housing. The housing consists of a bottom plate (1) and a housing (2) fixedly connected to the upper wall of the bottom plate (1). An endothermic structure for adsorbing the heat inside the housing (2) and transferring it to the housing (2) is arranged on the inner side wall of the housing (2). A heat dissipation structure for transferring the heat in the housing (2) to the outside is arranged on the circumferential outer wall of the housing (2). An installation hole for installing the motor assembly is arranged on the inner wall of the bottom plate (1). An oil inlet hole (6) and an oil outlet hole (7) that penetrate up and down are arranged on the inner wall of the bottom plate (1). The oil outlet hole (7) and the oil inlet hole (6) are both located inside the housing (2) under the top view projection and are respectively located on the left and right sides of the installation hole. The oil inlet hole (6) is communicated with the oil inlet flow channel of the electro-hydraulic servo valve body, and the oil outlet hole (7) is communicated with the oil return flow channel of the electro-hydraulic servo valve body.

2. The electro-hydraulic servo valve torque motor for an APU fuel regulator according to claim 1, characterized in that: An oil inlet pipe (9) communicated with the oil inlet hole (6) is fixedly connected to the upper wall of the bottom plate (1). An impeller housing (13) is fixedly connected to the middle position of the inner upper wall of the housing (2). An outlet pipe (1302) and an inlet pipe (1301) are respectively fixedly connected to the left and right side walls of the impeller housing (13). A temperature sensor (21) for detecting the temperature inside the housing (2) is fixedly connected to the lower wall of the impeller housing (13). A commutation structure is arranged between the oil inlet pipe (9) and the impeller housing (13). A heat exchange structure is arranged between the end of the outlet pipe (1302) far away from the impeller housing (13) and the oil outlet hole (7). A top cover (4) is fixedly connected to the upper wall of the housing (2). A filtering structure is arranged on the upper wall of the top cover (4). A rotating shaft (17) is rotatably connected vertically inside the impeller housing (13). The upper end of the rotating shaft (17) penetrates the upper wall of the housing (2) and extends into the inside of the top cover (4). A driving structure for driving the rotating shaft (17) to rotate is arranged at one end of the rotating shaft (17) located inside the impeller housing (13). An air-cooling structure for blowing air to the housing (2) for cooling is arranged at one end of the rotating shaft (17) located inside the top cover (4). Sealing structures are arranged between the impeller housing (13) and the inner upper wall of the housing (2), between the lower wall of the bottom plate (1), and between the rotating shaft (17) and the housing (2).

3. An electro-hydraulic servo valve torque motor for an APU fuel regulator according to claim 2, characterized in that: The endothermic structure includes multiple groups of endothermic fins (20). Multiple groups of the endothermic fins (20) are all arranged on the inner side wall of the housing (2), and the length directions of multiple groups of endothermic fins (20) are all parallel to the axial direction of the housing (2).

4. An electro-hydraulic servo valve torque motor for an APU fuel regulator according to claim 3, characterized in that: The heat dissipation structure includes multiple groups of heat dissipation fins (3). Multiple groups of the heat dissipation fins (3) are all arranged on the circumferential outer wall of the housing (2), and the length directions of multiple groups of heat dissipation fins (3) are all parallel to the axial direction of the housing (2). The inner diameter of the end of the top cover (4) facing the housing (2) is larger than the outer diameter of the housing (2). The top cover (4) is fixedly connected to the upper ends of multiple groups of heat dissipation fins (3). The top cover (4) is fixedly connected to the housing (2) through multiple groups of heat dissipation fins (3).

5. An electro-hydraulic servo valve torque motor for an APU fuel regulator according to claim 4, characterized in that: The commutation structure includes a commutation valve (10), a commutation motor (11), and a branch pipe (12). The commutation valve (10) is fixedly connected between one end of the oil inlet pipe (9) away from the oil inlet hole (6) and one end of the inlet pipe (1301) away from the impeller housing (13). A set of inlet holes and two sets of discharge holes are provided on the commutation valve (10). The oil inlet pipe (9) is in through connection with the inlet holes of the commutation valve (10). The inlet pipe (1301) is in through connection with one of the two sets of discharge holes of the commutation valve (10). The branch pipe (12) is fixedly connected between one set of discharge holes of the commutation valve (10) away from the inlet pipe (1301) and the outer wall of the outlet pipe (1302). The commutation motor (11) is fixedly connected to the lower wall of the commutation valve (10). The valve core of the commutation valve (10) is driven to rotate by the commutation motor (11).

6. An electro-hydraulic servo valve torque motor for an APU fuel regulator according to claim 5, characterized in that: The heat exchange structure is a heat exchange coil (14). The heat exchange coil (14) is fixedly connected between one end of the outlet pipe (1302) away from the impeller housing (13) and the oil outlet hole (7). The heat exchange coil (14) spirals along the inner side wall of the outer shell (2).

7. An electro-hydraulic servo valve torque motor for an APU fuel regulator according to claim 6, characterized in that: The filtering structure is a filter screen (5). The filter screen (5) is fixedly connected to the upper wall of the top cover (4).

8. An electro-hydraulic servo valve torque motor for an APU fuel regulator according to claim 7, characterized in that: The driving structure includes multiple groups of impeller blades (19). Multiple groups of the impeller blades (19) are fixedly connected to the outer wall of the rotating shaft (17) in a circumferentially equally divided manner with the axis of the rotating shaft (17) as the center. Multiple groups of the impeller blades (19) are all located inside the impeller housing (13), and the upper and lower ends of multiple groups of the impeller blades (19) are respectively in sliding connection with the inner upper wall of the outer shell (2) and the inner lower wall of the impeller housing (13).

9. An electro-hydraulic servo valve torque motor for an APU fuel regulator according to claim 8, characterized in that: The air-cooling structure is a fan (18). The fan (18) is fixedly connected to the outer wall of one end of the rotating shaft (17) extending into the top cover (4). The air outlet direction of the fan (18) is towards the top of the outer shell (2).

10. An electro-hydraulic servo valve torque motor for an APU fuel regulator according to claim 9, characterized in that: The sealing structure includes two sets of first sealing rings (8), one set of second sealing rings (15), and one set of third sealing rings (16). The two sets of first sealing rings (8) are both arranged on the lower wall of the bottom plate (1) and are respectively located around the oil inlet hole (6) and the oil outlet hole (7). The second sealing ring (15) is arranged between the impeller housing (13) and the inner upper wall of the outer shell (2). The third sealing ring (16) is arranged between the outer wall of the rotating shaft (17) and the inner side wall of the outer shell (2).

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