An EHA based on infrared heat dissipation, air cooling and water cooling technologies

Abstract

The present invention discloses an EHA based on infrared heat dissipation, air cooling and water cooling technologies. A servo motor drives a gear pump to rotate through a coupling. The gear pump is connected to an oil tank through a check valve, and the gear pump is respectively connected to the upper cavity and the lower cavity sealed by an oil cylinder through a pilot-operated check valve. A temperature sensor, a pressure measuring joint, a pressure sensor and a relief valve are respectively connected to the upper cavity and the lower cavity of the oil cylinder to monitor the operating state of the EHA and ensure the normal operation of the EHA. A hollow cooling sleeve is sleeved outside the cylinder barrel. The sealed cavity formed between the cooling sleeve, the cylinder barrel, the rear end cover and the front end cover is a cooling cavity. An electromagnetic air valve and an electromagnetic water valve are respectively connected to the cooling cavity to introduce cold air and coolant to realize the functions of air cooling and water cooling. Through the switching combination of the electromagnetic air valve and the electromagnetic water valve, the present invention realizes cooling methods of infrared heat dissipation, air cooling, water cooling and evaporation cooling corresponding to different cooling requirements, making the operation simpler, more flexible, efficient and energy-saving.

Description

Technical Field

[0001] The present invention relates to the technical field of EHA, and particularly to an EHA based on infrared heat dissipation, air cooling and water cooling technologies. Background Art

[0002] EHA originated from the hydrostatic transmission device in the early 20th century. Later, it was also called direct drive volume control in the aviation industries of the United States and the United Kingdom and the industrial circle of Japan. In the aviation industry of the United States, the power-by-wire system has developed rapidly in recent years and is now generally called an electric hydraulic actuator (EHA). Recently, under the background of the great era of carbon peak and carbon neutrality, and at the same time due to the huge development and progress of servo motor technology, EHA technology has gradually spread from the aerospace field to the general industrial and civil fields, such as metallurgy, pipeline, petrochemical and electric power industries.

[0003] Most of the EHAs adopt a closed hydraulic system. In the closed hydraulic system, internal leakage of each hydraulic component and friction of moving parts will generate power loss, and the lost energy will be converted into heat, which is absorbed by the hydraulic oil and hydraulic components of the system, causing the oil temperature of the hydraulic system to rise. Since the closed hydraulic system is a closed internal circulation system and the heat dissipation capacity of the closed hydraulic system itself is relatively poor, the problem of too high oil temperature in the closed hydraulic system is more prominent. The oil temperature of the hydraulic oil in the closed hydraulic system is one of the important parameters affecting the stability of the system. Too high oil temperature of the hydraulic oil in the closed hydraulic system will cause the hydraulic oil to oxidize and fail, shortening the service life of the hydraulic oil. The accompanying impurities will block the pipeline or jam the hydraulic components. After the oil temperature of the hydraulic oil rises, the viscosity of the hydraulic oil decreases, the oil film strength of the hydraulic oil decreases, the leakage of the hydraulic system increases, the hydraulic components wear severely, shortening the service life of the hydraulic components, and hydraulic components such as hydraulic seals require the hydraulic system to have a relatively stable working temperature. The traditional coolers of hydraulic systems mainly include shell-and-tube coolers, plate coolers and fan-type air coolers. Although these three forms of cooling technologies can meet the cooling function of traditional hydraulic systems, the volume and mass of these three coolers are too large, and even the volume and mass of these three coolers themselves have exceeded the volume and mass of the EHA itself. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention proposes an EHA based on infrared heat dissipation, air cooling and water cooling technologies, which is flexible in operation and control, has a large output force, high reliability, energy-saving, efficient, environmentally friendly, small and integrated, and can be applied to industries such as metallurgy, pipeline, petrochemical and electric power to meet the market demand for EHA.

[0005] The specific technical solution is as follows:

[0006] An EHA based on infrared heat dissipation, air cooling and water cooling technologies, comprising: a servo motor, a coupling, a gear pump, an oil tank, a one-way valve, a pilot-operated check valve, a relief valve, a pressure measuring joint, a pressure sensor, an oil cylinder, a temperature sensor, an electromagnetic air valve, an electromagnetic water valve, and a displacement sensor; the servo motor drives the gear pump to rotate through the coupling, and the gear pump is communicated with the oil tank through the one-way valve; the displacement sensor is fixedly connected to the oil cylinder and is used for detecting and feeding back the position signal of the oil cylinder to the servo motor, so as to control the start and stop of the servo motor;

[0007] The oil cylinder comprises: a piston rod, a rear guide sleeve, a rear baffle, a rear end cover, a cooling sleeve, a cylinder barrel, a front end cover, a front baffle, and a front guide sleeve; the interior of the cylinder barrel is hollow, one end of the cylinder barrel is fixedly connected to one end of the rear end cover, and the other end is fixedly connected to one end of the front end cover. The other end of the rear end cover is fixedly connected to the rear guide sleeve through the rear baffle, and the other end of the front end cover is fixedly connected to the front guide sleeve through the front baffle; the piston rod is inserted into the cylinder barrel and passes through the rear end cover, the rear guide sleeve, the front end cover, and the front guide sleeve respectively;

[0008] The cooling sleeve is hollow inside and sleeved outside the cylinder barrel. One end of the cooling sleeve is fixedly connected to the rear end cover, and the other end is fixedly connected to the front end cover; the sealed cavity formed among the cooling sleeve, the cylinder barrel, the rear end cover, and the front end cover is a cooling cavity; the sealed cavity formed among the piston rod, the cylinder barrel, the rear end cover, and the rear guide sleeve is the upper cavity of the oil cylinder; the sealed cavity formed among the piston rod, the cylinder barrel, the front end cover, and the front guide sleeve is the lower cavity of the oil cylinder;

[0009] The electromagnetic air valve and the electromagnetic water valve are respectively communicated with the cooling cavity and are used for introducing cold air and cooling water; the temperature sensor, the pressure measuring joint, the pressure sensor, and the relief valve are respectively communicated with the upper cavity and the lower cavity of the oil cylinder and are used for monitoring the operation state of the EHA and ensuring the normal operation of the EHA; the gear pump is respectively communicated with the upper cavity and the lower cavity of the oil cylinder through the pilot-operated check valve;

[0010] The outer surface of the EHA is processed with heat dissipation grilles to increase the heat dissipation area, and an infrared heat dissipation material is sprayed to stimulate the infrared resonance effect on the outer surface.

[0011] Further, the oil cylinder further includes: a combined seal ring, a dust seal, a YX seal ring, a Struthers seal, an O-ring seal, and a guide strip; a guide strip and a combined seal ring are sleeved on the outer periphery of the middle piston portion of the piston rod for isolating the upper chamber and the lower chamber of the oil cylinder; between the rear end cover and the cylinder barrel, between the rear guide sleeve and the rear end cover, between the cooling sleeve and the rear end cover, between the front end cover and the cylinder barrel, between the front guide sleeve and the front end cover, and between the cooling sleeve and the front end cover, sealing is achieved through O-ring seals; inside the through holes of the rear guide sleeve and the front guide sleeve, the dust seal, the YX seal ring, the guide strip, and the Struthers seal are sequentially arranged, and the Struthers seal is close to the inside of the cylinder barrel to seal between the piston rod and the rear guide sleeve and the front guide sleeve.

[0012] Further, the temperature sensors are respectively communicated with the upper chamber and the lower chamber of the oil cylinder for detecting the temperatures of the upper chamber and the lower chamber of the oil cylinder; the pressure measuring joints and the pressure sensors are respectively communicated with the upper chamber and the lower chamber of the oil cylinder for measuring the pressures of the hydraulic oil in the upper chamber and the lower chamber of the oil cylinder; the upper chamber of the oil cylinder is communicated with the oil tank through one of the overflow valves, and the lower chamber of the oil cylinder is communicated with the oil tank through the other overflow valve.

[0013] Further, the infrared heat dissipation material is manufactured by using nanotechnology.

[0014] Further, the rear baffle is fixedly connected to the rear end cover and the rear guide sleeve through screws, nuts, and spring washers, and the front baffle is fixedly connected to the front end cover and the front guide sleeve, so that the rear baffle, the rear end cover, the rear guide sleeve, the cylinder barrel, the front baffle, the front end cover, and the front guide sleeve are connected into one body.

[0015] The beneficial effects of the present invention are as follows:

[0016] (1) By controlling the opening and closing of the electromagnetic air valve and the electromagnetic water valve and combining them, the present invention realizes corresponding cooling methods of infrared heat dissipation, air cooling, water cooling, and evaporation cooling for different cooling requirements, making the operation and control simpler, more flexible, more efficient, and more energy-saving.

[0017] (2) The present invention adopts an advanced infrared heat dissipation technology, processes heat dissipation grids on the surface of the EHA to increase the heat dissipation area, and integrally sprays an infrared heat dissipation material to stimulate the infrared resonance effect on the surface of the EHA, significantly improving the far-infrared emission efficiency, accelerating the rapid dissipation of heat from the surface of the EHA, effectively improving the heat dissipation efficiency, and significantly reducing the temperature of the EHA.

[0018] (3) The present invention adopts a modular design, without any exposed hydraulic pipelines, with high reliability and the characteristics of small-scale integration.

[0019] (4) The present invention has strong adaptability, a simple structure, is easy to manufacture, and is convenient for installation, disassembly, and debugging.

[0020] (5) The present invention can replace components of different models and sizes, meet different usage scenarios and requirements, with low cost, simple operation, and is easy to promote and use. Description of the Drawings

[0021] Figure 1 It is a schematic diagram of the hydraulic principle of the present invention.

[0022] Figure 2 It is a schematic structural diagram of the present invention.

[0023] Figure 3 It is the front view of the structure of the present invention.

[0024] Figure 4 It is the right view of the structure of the present invention.

[0025] Figure 5 It is the front view cross-section of the oil cylinder of the present invention.

[0026] In the figure, servo motor 1, coupling 2, gear pump 3, oil tank 4, check valve 1 5-1, check valve 2 5-2, pilot-operated check valve 1 6-1, pilot-operated check valve 2 6-2, relief valve 1 7-1, relief valve 2 7-2, pressure measuring joint 1 8-1, pressure measuring joint 2 8-2, pressure sensor 1 9-1, pressure sensor 2 9-2, oil cylinder 10, piston rod 10-1, rear guide sleeve 10-2, screw 10-3, nut 10-4, spring washer 10-5, rear baffle 10-6, rear end cover 10-7, guide strip 1 10-8, combined seal 10-9, dust seal 10-10, YX seal 10-11, guide strip 2 10-12, star seal 10-13, O-ring 1 10-14, O-ring 2 10-15, O-ring 3 10-16, O-ring 4 10-17, O-ring 5 10-18, O-ring 6 10-19, cooling sleeve 10-20, cylinder barrel 10-21, front end cover 10-22, front baffle 10-23, front guide sleeve 10-24, temperature sensor 1 11-1, temperature sensor 2 11-2, solenoid air valve 1 12-1, solenoid air valve 2 12-2, solenoid water valve 1 13-1, solenoid water valve 2 13-2, LVDT displacement sensor 14. Detailed Embodiments

[0027] The present invention will be described in detail below according to the drawings and preferred embodiments. The purpose and effects of the present invention will become clearer. The present invention will be further described in detail below in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0028] As Figure 1As shown in the figure, the EHA based on infrared heat dissipation, air cooling and water cooling technologies includes: servo motor 1, coupling 2, gear pump 3, fuel tank 4, check valve 1 5-1, check valve 2 5-2, pilot-operated check valve 1 6-1, pilot-operated check valve 2 6-2, relief valve 1 7-1, relief valve 2 7-2, pressure measuring joint 1 8-1, pressure measuring joint 2 8-2, pressure sensor 1 9-1, pressure sensor 2 9-2, oil cylinder 10, temperature sensor 1 11-1, temperature sensor 2 11-2, electromagnetic air valve 1 12-1, electromagnetic air valve 2 12-2, electromagnetic water valve 1 13-1, electromagnetic water valve 2 13-2, LVDT displacement sensor 14.

[0029] As Figures 2 - 4 shown, the upper end of the coupling 2 is fixedly connected to the servo motor 1, and the other end is fixedly connected to the fuel tank 4 and the gear pump 3. The fuel tank 4 is fixedly connected outside the gear pump 3 and seals it. The gear pump 3 is communicated with the fuel tank 4 through the check valve 1 5-1 and the check valve 2 5-2. The servo motor 1 controls the rotation of the gear pump 3 through the coupling 2. One side of the output end of the coupling 2 is fixedly connected to the oil cylinder 10. An LVDT displacement sensor 14 is fixedly connected to the oil cylinder 10 to feedback the position signal of the oil cylinder 10 to the servo motor 1, thereby controlling the start and stop of the servo motor 1. The check valve 1 5-1 and the check valve 2 5-2 are fixedly connected to the coupling 2.

[0030] As Figure 5 shown, the oil cylinder 10 includes: piston rod 10-1, rear guide sleeve 10-2, screw 10-3, nut 10-4, spring washer 10-5, rear baffle 10-6, rear end cover 10-7, guide strip 1 10-8, combined seal ring 10-9, dust seal 10-10, YX seal ring 10-11, guide strip 2 10-12, sterling seal 10-13, O-ring 1 10-14, O-ring 2 10-15, O-ring 3 10-16, O-ring 4 10-17, O-ring 5 10-18, O-ring 6 10-19, cooling sleeve 10-20, cylinder barrel 10-21, front end cover 10-22, front baffle 10-23, front guide sleeve 10-24.

[0031] The cylinder barrel 10-21 is a hollow cylinder. The piston rod 10-1 is inserted into the cylinder barrel 10-21. The piston rod 10-1 consists of an upper rod part, a lower rod part and a middle piston part, and the diameter of the middle piston part is larger than that of the upper and lower rod parts; a first guide band 10-8 and a combined seal ring 10-9 are sleeved on the outer periphery of the middle piston part of the piston rod 10-1. The rear end cover 10-7 is fixedly connected to the upper end of the cylinder barrel 10-21 and is sealed by a third O-ring 10-16 and a fourth O-ring 10-17. A through hole is provided in the center of the rear end cover 10-7, which is just large enough for the upper rod part of the piston rod 10-1 to pass through. The rear guide sleeve 10-2 is fixedly connected to the upper surface of the rear end cover 10-7 and is sealed by a first O-ring 10-14 and a second O-ring 10-15. A through hole is provided in the center of the rear guide sleeve 10-2, which is just large enough for the upper rod part of the piston rod 10-1 to pass through. A dust ring 10-10, a YX-type seal ring 10-11, a second guide band 10-12, and a star seal 10-13 are arranged in sequence from top to bottom inside the through hole of the rear guide sleeve 10-2, which are used to seal the hydraulic oil inside the cylinder barrel 10-21 and prevent external gas or dust from entering the inside of the cylinder barrel 10-21. The rear baffle 10-6 is fixedly connected to the rear end cover 10-7 and the rear guide sleeve 10-2 by screws 10-3, nuts 10-4, and spring washers 10-5, so that the rear baffle 10-6, the rear end cover 10-7, the rear guide sleeve 10-2, and the cylinder barrel 10-21 are connected into one body.

[0032] The front end cover 10-22 is fixedly connected to the lower end of the cylinder barrel 10-21 and is sealed by a third O-ring 10-16 and a fourth O-ring 10-17. A through hole is provided in the center of the front end cover 10-22, which is just large enough for the lower rod part of the piston rod 10-1 to pass through. The front guide sleeve 10-24 is fixedly connected to the lower surface of the front end cover 10-22 and is sealed by a first O-ring 10-14 and a second O-ring 10-15. A through hole is provided in the center of the front guide sleeve 10-24, which is just large enough for the lower rod part of the piston rod 10-1 to pass through. A dust ring 10-10, a YX-type seal ring 10-11, a second guide band 10-12, and a star seal 10-13 are arranged in sequence from bottom to top inside the through hole of the front guide sleeve 10-24, which are used to seal the hydraulic oil inside the cylinder barrel 10-21 and prevent external gas or dust from entering the inside of the cylinder barrel 10-21. The front baffle 10-23 is fixedly connected to the front end cover 10-22 and the front guide sleeve 10-24, so that the rear baffle 10-6, the rear end cover 10-7, the rear guide sleeve 10-2, the cylinder barrel 10-21, the front baffle 10-23, the front end cover 10-22, and the front guide sleeve 10-24 are connected into one body.

[0033] The cooling sleeve 10-20 is internally hollow and sleeved outside the cylinder barrel 10-21. The upper end of the cylinder barrel 10-21 is fixedly connected to the rear end cover 10-7, and the lower end is fixedly connected to the front end cover 10-22, and seals are achieved through O-ring seal five 10-18 and O-ring seal six 10-19. A sealed cavity is formed among the cooling sleeve 10-20, the cylinder barrel 10-21, the rear end cover 10-7, and the front end cover 10-22, and this cavity is the cooling cavity; the sealed cavity formed among the piston rod 10-1, the cylinder barrel 10-21, the rear end cover 10-7, and the rear guide sleeve 10-6 is the upper chamber of the oil cylinder 10; the sealed cavity formed among the piston rod 10-1, the cylinder barrel 10-21, the front end cover 10-22, and the front guide sleeve 10-24 is the lower chamber of the oil cylinder 10.

[0034] The function of the guide strip one 10-8 is to prevent the piston rod 10-1 from directly contacting the inner wall of the cylinder barrel 10-21. The function of the guide strip two 10-12 is to prevent the piston rod 10-1 from directly contacting the inner wall of the rear guide sleeve 10-2 or the front guide sleeve 10-24. The guide strip one 10-8 and the guide strip two 10-12 can also ensure that the oil cylinder 10 can absorb lateral loads, improve the load-bearing capacity of the oil cylinder 10, and at the same time protect other sealing rings from the influence of the Diesel effect. The combined sealing ring 10-9 is used to isolate the upper and lower chambers of the oil cylinder 10, so that the oil fluid between the upper and lower chambers of the oil cylinder 10 is isolated from each other.

[0035] The electromagnetic air valve one 12-1 is communicated with the upper end of the cooling cavity, the electromagnetic air valve two 12-2 is communicated with the lower end of the cooling cavity, and the electromagnetic air valve one 12-1 and the electromagnetic air valve two 12-2 are located on the opposite sides of the cooling sleeve 10-20. The electromagnetic water valve one 13-1 is communicated with the lower end of the cooling cavity, the electromagnetic water valve two 13-2 is communicated with the upper end of the cooling cavity, and the electromagnetic water valve one 13-1 is on the same side as the electromagnetic air valve one 12-1, and the electromagnetic water valve two 13-2 is on the same side as the electromagnetic air valve two 12-2. The temperature sensor one 11-1 is fixedly connected to the rear end cover 10-7 and is communicated with the upper chamber of the oil cylinder 10. The temperature sensor two 11-2 is fixedly connected to the front end cover 10-22 and is communicated with the lower chamber of the oil cylinder 10. The temperature sensor one 11-1 and the temperature sensor two 11-2 are used to detect the temperatures of the upper and lower chambers of the oil cylinder 10. The pressure measuring joint one 8-1 and the pressure sensor one 9-1 are respectively communicated with the upper chamber of the oil cylinder 10. The pressure measuring joint two 8-2 and the pressure sensor two 9-2 are respectively communicated with the lower chamber of the oil cylinder 10; the pressure measuring joint one 8-1, the pressure measuring joint two 8-2, the pressure sensor one 9-1, the pressure sensor two 9-2, the temperature sensor one 11-1, and the temperature sensor two 11-2 work together to monitor the operating state of the EHA. The gear pump 3 is communicated with the lower chamber of the oil cylinder 10 through the hydraulic control check valve two 6-2 and is communicated with the upper chamber of the oil cylinder 10 through the hydraulic control check valve one 6-1; the lower chamber of the oil cylinder 10 is communicated with the fuel tank 4 through the overflow valve two 7-2, and the upper chamber is communicated with the fuel tank 4 through the overflow valve one 7-1.

[0036] As Figure 5 shown, it is the initial state of the EHA. At this time, the piston rod 10-1 is at the uppermost end. When the piston rod 10-1 moves downward along the axis, it is recorded as extending. Conversely, when it moves upward along the axis, it is retracting.

[0037] When the piston rod 10-1 extends to any position and maintains the state, the changes of each component are as follows: The servo motor 1 receives the control signal to extend to any position. The servo motor 1 drives the gear pump 3 to rotate forward through the coupling 2. The gear pump 3 sucks the hydraulic oil in the lower chamber of the oil cylinder 10 through the second hydraulic control check valve 6-2. If necessary, the hydraulic oil is supplemented from the oil tank 4 through the first check valve 5-1. Then, the gear pump 3 transports the hydraulic oil to the upper chamber of the oil cylinder 10 through the first hydraulic control check valve 6-1. At this time, the piston rod 10-1 extends. When the piston rod 10-1 reaches the specified position, the LVDT displacement sensor 14 feeds back the position signal. At this time, the servo motor 1 will stop rotating forward. The oil cylinder 10 is maintained at the specified position under the action of the first hydraulic control check valve 6-1 and the second hydraulic control check valve 6-2. During the extension process of the piston rod 10-1 of the oil cylinder 10, the pressure of the hydraulic oil in the upper chamber of the oil cylinder 10 is detected throughout the process by the first pressure sensor 9-1 and the first pressure measuring joint 8-1, and the pressure of the hydraulic oil in the lower chamber of the oil cylinder 10 is detected throughout the process by the second pressure sensor 9-2 and the second pressure measuring joint 8-2. The oil fluid exceeding the set pressures of the first relief valve 7-1 and the second relief valve 7-2 flows back into the interior of the oil tank 4 through the first relief valve 7-1 and the second relief valve 7-2, so as to better control and protect the EHA.

[0038] When the piston rod 10-1 retracts to any position and maintains the state, the changes of each component are as follows: The servo motor 1 receives the control signal to retract to any position. The servo motor 1 drives the gear pump 3 to rotate reversely through the coupling 2. The gear pump 3 sucks the hydraulic oil in the upper chamber of the oil cylinder 10 through the first hydraulic control check valve 6-1. If necessary, the hydraulic oil is supplemented from the oil tank 4 through the second check valve 5-2. Then, the gear pump 3 transports the hydraulic oil to the lower chamber of the oil cylinder 10 through the second hydraulic control check valve 6-2. At this time, the piston rod 10-1 retracts. When the piston rod 10-1 reaches the specified position, the LVDT displacement sensor 14 feeds back the position signal. At this time, the servo motor 1 will stop rotating reversely. The oil cylinder 10 is maintained at the specified position under the action of the first hydraulic control check valve 6-1 and the second hydraulic control check valve 6-2. During the retraction process of the piston rod 10-1 of the oil cylinder 10, the pressure of the hydraulic oil in the upper chamber of the oil cylinder 10 is detected throughout the process by the first pressure sensor 9-1 and the first pressure measuring joint 8-1, and the pressure of the hydraulic oil in the lower chamber of the oil cylinder 10 is detected throughout the process by the second pressure sensor 9-2 and the second pressure measuring joint 8-2. The oil fluid exceeding the set pressures of the first relief valve 7-1 and the second relief valve 7-2 flows back into the interior of the oil tank 4 through the first relief valve 7-1 and the second relief valve 7-2, so as to better control and protect the EHA.

[0039] In addition to processing heat dissipation grilles on the surface of the EHA and spraying infrared heat dissipation materials for infrared heat dissipation, the present invention also realizes the functions of cold air cooling, water cooling, and evaporative cooling through solenoid air valve 12-1, solenoid air valve 12-2, solenoid water valve 13-1, solenoid water valve 13-2, and the cooling cavity. The functions adopted for different cooling requirements are as follows:

[0040] (1) Realization of infrared heat dissipation function: When the internal temperature of the oil cylinder 10 is lower than the set minimum value of the lowest gear, the cooling requirement can be achieved only through the infrared heat dissipation function. Heat dissipation grilles are processed on the outer surface of the EHA to increase the heat dissipation area, so as to better dissipate heat, and the weight of the EHA can be reduced. By spraying infrared heat dissipation materials on the overall outer surface of the EHA, the infrared resonance effect on the surface of the EHA is excited, the far-infrared emission efficiency is significantly improved, the heat is quickly dissipated from the surface of the EHA, the heat dissipation efficiency is effectively improved, and the temperature of the EHA is significantly reduced. The infrared heat dissipation material sprayed on the outer surface of the EHA is manufactured by nanotechnology, has the characteristics of good corrosion resistance, good weather resistance, high cost performance, and also has environmental protection advantages such as environmental friendliness, non-toxic and emission-free, and can be modulated into most required colors according to needs, so that the EHA can complete the infrared heat dissipation function and can be used more widely and efficiently and environmentally friendly.

[0041] (2) Realization of air cooling function: When temperature sensor 11-1 or temperature sensor 11-2 detects that the internal temperature of the oil cylinder 10 rises to the set minimum value of the lowest gear, it proves that the infrared heat dissipation can no longer meet the cooling requirement of the EHA at this time, and the air cooling mode needs to be started. At this time, solenoid water valve 13-1 and solenoid water valve 13-2 are in the power-off and closed state, and solenoid air valve 12-1 and solenoid air valve 12-2 are in the power-on and open state. Cold air enters the cooling cavity between the cooling sleeve 10-20 and the cylinder barrel 10-21 from solenoid air valve 12-1. Since the specific gravity of cold air is greater than that of hot air, the cold air will fill the cooling cavity and flow out from solenoid air valve 12-2, taking away the heat generated by the EHA at the same time and reducing the temperature of the EHA, thus realizing the air cooling function of the EHA. When temperature sensor 11-1 and temperature sensor 11-2 detect that the internal temperature of the oil cylinder 10 drops to the set minimum value of the lowest gear, solenoid air valve 12-1 and solenoid air valve 12-2 are powered off and closed; at this time, solenoid air valve 12-1 and solenoid air valve 12-2, solenoid water valve 13-1 and solenoid water valve 13-2 are all in the power-off and closed state, and the EHA is in the closed state of the air cooling mode.

[0042] (3)Implementation of the water cooling function: When temperature sensor 11-1 or temperature sensor 11-2 detects that the internal temperature of the oil cylinder 10 has risen to the set medium value, it proves that infrared radiation and air cooling can no longer meet the cooling requirements of the EHA at this time, and the water cooling mode needs to be started. At this time, electromagnetic water valve 13-1 and electromagnetic water valve 13-2 are energized and opened, and electromagnetic air valve 12-1 and electromagnetic air valve 12-2 are de-energized and closed. Cooling water enters the cooling cavity between the cooling sleeve 10-20 and the cylinder barrel 10-21 from electromagnetic water valve 13-1. Due to the gravity of the cooling water, the cooling cavity will be filled with cooling water and flow out from electromagnetic water valve 13-2. At the same time, the heat generated by the EHA is taken away to reduce the temperature of the EHA, realizing the water cooling function of the EHA. When temperature sensor 11-1 and temperature sensor 11-2 detect that the internal temperature of the oil cylinder 10 has dropped to the set lowest value, electromagnetic water valve 13-1 and electromagnetic water valve 13-2 are de-energized and closed; at this time, electromagnetic air valve 12-1, electromagnetic air valve 12-2, electromagnetic water valve 13-1 and electromagnetic water valve 13-2 are all de-energized and closed, and the EHA is in the closed state of the water cooling mode.

[0043] (4) Realization of the evaporative cooling function: When temperature sensor 11-1 or temperature sensor 11-2 detects that the internal temperature of the oil cylinder 10 has risen to the set maximum value, it proves that infrared heat dissipation, air cooling, and water cooling can no longer meet the cooling requirements of the EHA at this time, and the evaporative cooling mode needs to be started. First, make the first electromagnetic water valve 13-1 and the second electromagnetic water valve 13-2 in the powered-on and open state, and the first electromagnetic air valve 12-1 and the second electromagnetic air valve 12-2 in the powered-off and closed state. Cooling water enters the cooling cavity between the cooling sleeve 10-20 and the cylinder barrel 10-21 from the first electromagnetic water valve 13-1, fills the cooling cavity due to gravity, and flows out from the second electromagnetic water valve 13-2. When the cooling water fills the cooling cavity, make the first electromagnetic water valve 13-1 and the second electromagnetic water valve 13-2 in the powered-off and closed state, and the first electromagnetic air valve 12-1 and the second electromagnetic air valve 12-2 in the powered-on and open state. Cold air enters the cooling cavity from the first electromagnetic air valve 12-1. Since the specific gravity of cold air is greater than that of hot air, the cold air will fill the cooling cavity and flow out from the second electromagnetic air valve 12-2. At the same time, the cold air causes the remaining cooling water in the cooling cavity to evaporate, further taking away the heat generated by the EHA and reducing the temperature of the EHA. Cooling water and cold air are intermittently introduced into the cooling cavity to realize the evaporative cooling function. When temperature sensor 11-1 and temperature sensor 11-2 detect that the internal temperature of the oil cylinder 10 has dropped to the set minimum value, the first electromagnetic air valve 12-1, the second electromagnetic air valve 12-2, the first electromagnetic water valve 13-1, and the second electromagnetic water valve 13-2 are all in the powered-off and closed state, and the EHA is in the closed state of the evaporative cooling mode. The evaporative cooling mode can also be used as a drying mode after each water cooling mode to remove the remaining moisture in the closed space, so as to better protect the EHA.

[0044] The present invention feeds back the position signal of the oil cylinder 10 through the LVDT displacement sensor 14, and feeds back the internal pressure signal of the oil cylinder 10 through the pressure sensor. During normal operation, it controls the rotation of the servo motor 1 to drive the gear pump 3 to rotate according to the signal sent by the control system, and then drives the oil cylinder 10 to act, so as to meet the use requirements. The system temperature signal is fed back through the temperature sensor, and the electromagnetic air valve and the electromagnetic water valve are controlled according to the signal sent by the control system, so as to meet the use requirements. All designs of the present invention adopt modular design, without any exposed hydraulic pipelines, and have higher reliability. The EHA designed by the present invention based on infrared heat dissipation, air cooling, and water cooling technologies is an EHA technology with flexible operation and control, large output force, high reliability, energy-saving, efficient, environmentally friendly, and small and integrated, and can be applied to industries such as metallurgy, pipelines, petrochemicals, and electric power.

[0045] Those of ordinary skill in the art will understand that the above are only preferred examples of the invention and are not used to limit the invention. Although the invention has been described in detail with reference to the foregoing examples, those skilled in the art can still modify the technical solutions described in the foregoing examples or make equivalent replacements for some of the technical features. Any modifications, equivalent replacements, etc. made within the spirit and principle of the invention shall be included within the protection scope of the invention.

Claims

1. An EHA based on infrared heat dissipation, air cooling and water cooling technologies, characterized in that Including: Servo motor, coupling, gear pump, oil tank, check valve, pilot-operated check valve, relief valve, pressure measuring joint, pressure sensor, oil cylinder, temperature sensor, electromagnetic air valve, electromagnetic water valve, displacement sensor; the servo motor drives the gear pump to rotate through the coupling, and the gear pump is communicated with the oil tank through the check valve; the displacement sensor is fixedly connected to the oil cylinder and is used to detect and feedback the position signal of the oil cylinder to the servo motor, so as to control the start and stop of the servo motor. The oil cylinder includes: piston rod, rear guide sleeve, rear baffle, rear end cover, cooling sleeve, cylinder barrel, front end cover, front baffle, front guide sleeve. The interior of the cylinder barrel is hollow. One end of the cylinder barrel is fixedly connected to one end of the rear end cover, and the other end is fixedly connected to one end of the front end cover. The other end of the rear end cover is fixedly connected to the rear guide sleeve through the rear baffle, and the other end of the front end cover is fixedly connected to the front guide sleeve through the front baffle; the piston rod is inserted into the cylinder barrel and passes through the rear end cover, rear guide sleeve, front end cover and front guide sleeve respectively. The interior of the cooling sleeve is hollow and is sleeved outside the cylinder barrel. One end of the cooling sleeve is fixedly connected to the rear end cover, and the other end is fixedly connected to the front end cover; the closed cavity formed among the cooling sleeve, cylinder barrel, rear end cover and front end cover is the cooling cavity; the closed cavity formed among the piston rod, cylinder barrel, rear end cover and rear guide sleeve is the upper cavity of the oil cylinder; the closed cavity formed among the piston rod, cylinder barrel, front end cover and front guide sleeve is the lower cavity of the oil cylinder. The electromagnetic air valve and the electromagnetic water valve are respectively communicated with the cooling cavity and are used to introduce cold air and cooling water; the temperature sensor, pressure measuring joint, pressure sensor and relief valve are respectively communicated with the upper cavity and the lower cavity of the oil cylinder and are used to monitor the operation state of the EHA and ensure the normal operation of the EHA; the gear pump is respectively communicated with the upper cavity and the lower cavity of the oil cylinder through the pilot-operated check valve. The outer surface of the EHA is processed with heat dissipation gratings to increase the heat dissipation area, and an infrared heat dissipation material is sprayed to stimulate the infrared resonance effect on the outer surface.

2. The EHA based on infrared heat dissipation, air cooling and water cooling technologies according to claim 1, characterized in that, The oil cylinder further includes: combined seal ring, dust seal, YX seal ring, stepped seal, O-ring seal, guide strip; a guide strip and a combined seal ring are sleeved on the outer periphery of the middle piston part of the piston rod and are used to isolate the upper cavity and the lower cavity of the oil cylinder; the O-ring seals are used to achieve sealing between the rear end cover and the cylinder barrel, between the rear guide sleeve and the rear end cover, between the cooling sleeve and the rear end cover, between the front end cover and the cylinder barrel, between the front guide sleeve and the front end cover, and between the cooling sleeve and the front end cover; the dust seal, YX seal ring, guide strip and stepped seal are sequentially arranged inside the through holes of the rear guide sleeve and the front guide sleeve, and the stepped seal is close to the inside of the cylinder barrel to seal between the piston rod and the rear guide sleeve and the front guide sleeve.

3. The EHA based on infrared heat dissipation, air cooling and water cooling technologies according to claim 1, characterized in that, The temperature sensors are respectively communicated with the upper chamber and the lower chamber of the oil cylinder, and are used for detecting the temperatures of the upper chamber and the lower chamber of the oil cylinder; the pressure measuring joints and the pressure sensors are respectively communicated with the upper chamber and the lower chamber of the oil cylinder, and are used for measuring the pressures of the hydraulic oil in the upper chamber and the lower chamber of the oil cylinder; the upper chamber of the oil cylinder is communicated with the oil tank through one of the overflow valves, and the lower chamber of the oil cylinder is communicated with the oil tank through the other overflow valve.

4. The EHA based on infrared heat dissipation, air cooling and water cooling technologies according to claim 1, characterized in that The infrared heat dissipation material is manufactured by using nanotechnology.

5. The EHA based on infrared heat dissipation, air cooling and water cooling technologies according to claim 1, characterized in that, The rear baffle is fixedly connected to the rear end cover and the rear guide sleeve through screws, nuts and spring washers, and the front baffle is fixedly connected to the front end cover and the front guide sleeve, so that the rear baffle, the rear end cover, the rear guide sleeve, the cylinder barrel, the front baffle, the front end cover and the front guide sleeve are connected into one body.

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