High-temperature cooling brake wire harness of electric vehicle and alarm device of high-temperature cooling brake wire harness

Abstract

The invention relates to an electrical safety device of an electric vehicle, in particular to the field of cooling of a brake wire harness of an electric vehicle, and discloses a high-temperature cooling brake wire harness of an electric vehicle and an alarm device of the high-temperature cooling brake wire harness of the electric vehicle. A circulation space for circulating cooling liquid is formed among the thin pipeline, the thick pipeline and the high-voltage wire harness; a water inlet pipe is arranged at one end of the cooling pipeline, a water outlet pipe is arranged at the other end of the cooling pipeline, and a water pump is mounted on the water inlet pipe and used for driving liquid to flow in the cooling pipeline; when the liquid flows in the thin pipeline, the liquid generates wave-shaped disturbance and turbulent flow in the thin pipeline, the liquid can roll and mix in the thin pipeline, and when heat is absorbed, the temperature uniformity of the liquid can be ensured, so that the liquid has a higher heat absorption effect; the liquid is in a laminar flow state when flowing in the thick pipeline, the liquid flows slowly, the contact time of the liquid and the pipeline can be prolonged, and more heat can be taken away.

Description

Technical Field

[0001] The invention relates to an electrical safety device for electric vehicles, in particular to the field of temperature reduction and cooling of brake harnesses of electric vehicles, specifically to a high-temperature cooling brake harness of an electric vehicle and an alarm device thereof. Background Art

[0002] Electric vehicles are vehicles that use an onboard power source as a driving force, use motors to drive the wheels, and comply with various requirements of road traffic and safety regulations. With the growing awareness of environmental protection, electric vehicles are becoming more and more widely used. For example, Chinese automakers such as BYD, NIO, and Xiaopeng Motors, as well as foreign automakers such as the famous Tesla, are all companies that make electric vehicles.

[0003] Electric vehicles are equipped with energy recovery systems. When the vehicle is decelerating, the energy generated by braking friction is collected and reused for driving. This system utilizes the principle of magnetoelectricity to convert the kinetic energy of the vehicle into electrical energy for recovery through an electric motor.

[0004] When a moving vehicle decelerates (coasting by releasing the accelerator or braking by applying the brakes), the motor is still coupled to the wheels. The rotor permanent magnet rotates at high speed driven by the wheels and the transmission mechanism and the magnetic flux lines are cut by the stator winding coils. The stator winding generates a reverse induced current, which is recharged to the battery through the motor and generates a reverse torque on the rotor to prevent the vehicle from moving forward, thereby achieving vehicle deceleration.

[0005] Electric vehicles have two ways of energy recovery, namely braking energy recovery and coasting energy recovery. The only criterion for distinguishing them is whether the brake pedal is pressed. Energy recovery by pressing the brake pedal is called braking energy recovery, and energy recovery by only releasing the accelerator is called coasting energy recovery.

[0006] There are currently two ways to achieve motor braking energy recovery, one is the additive regenerative braking system (RBS), and the other is the collaborative regenerative braking system (CRBS). The biggest difference between the two is whether the brake pedal is decoupled from the brake actuator (RBS is coupled, CRBS is decoupled). In a braking condition of an electric vehicle, one source of braking torque is the mechanical braking brought by the friction plate, and the other source is the negative torque provided by the motor to achieve deceleration through the drive shaft, which is electric braking. As long as the proportion of electric braking is higher, there will be more "magnetic electricity", and more electricity can be recovered.

[0007] The brake pedal and hydraulic mechanism of CRBS are decoupled. After the brake pedal is pressed, the controller uses the travel sensor to infer the driver's braking demand based on the current pedal angle and angular velocity, and calculates the required braking force. The motor is then used as the main torque source, and hydraulic braking is used to compensate for insufficient braking torque. This increases the proportion of electric braking and, in turn, increases energy recovery.

[0008] When using a collaborative regenerative braking system (CRBS), only the motor is used as the main torque source. During braking, since the motor is in a high-speed rotation state, it will generate a large current and voltage, and there will be a large voltage and current change in the recovery line (i.e., the brake line). Therefore, the brake recovery harness is set relatively thick. When the power is recovered, a large amount of heat will be generated in the brake line. When the temperature is high, the resistance of the brake line will increase, thereby increasing the heat loss. Summary of the invention

[0009] The object of the present invention is to provide a high-temperature cooling brake harness for an electric vehicle and an alarm device thereof, so as to solve the problems raised in the above-mentioned background technology.

[0010] In order to solve the above technical problems, the present invention provides the following technical solutions: an electric vehicle high-temperature cooling brake harness, comprising a high-voltage harness, a cooling pipe is arranged on the outside of the high-voltage harness, the cooling pipe is composed of a thin pipe and a thick pipe connected in series, a circulation space for circulating cooling liquid is formed between the thin pipe, the thick pipe and the high-voltage harness, and the thin pipe is located at both ends of the high-voltage harness;

[0011] A water inlet pipe is provided at one end of the cooling pipe, and a water outlet pipe is provided at the other end. The cooling pipe is connected between the water inlet pipe and the water outlet pipe. A heat dissipation fin is fixedly installed on the outside of the cooling pipe. A water pump is also installed on the water inlet pipe. The water pump is used to drive the liquid to flow in the cooling pipe.

[0012] When the liquid flows in the capillary, the liquid generates wave-shaped disturbance and turbulence in the capillary, and the liquid can roll and mix in the capillary;

[0013] When the liquid flows in a thick pipe, it is in a laminar flow state and flows relatively slowly, which can increase the contact time between the liquid and the pipe and take away more heat.

[0014] Preferably, the outer diameter of the high-voltage wire harness is a certain value during production, set as r 线 ,

[0015] The radius of the water inlet pipe is r1, and the flow rate of the liquid is v1. The speed v1 is provided by the water pump, which is a known condition.

[0016] The radius of the thin pipe is set to r2, and the radius of the thick pipe is set to r3.

[0017] Since the water inlet pipe, thick pipe and thin pipe are connected in series, the flow rate Q of the three is the same.

[0018] v2×π×(r2 2 -r 线 2 )=v3×π×(r3 2 -r 线 2 )=v1×π×r1 2 ,

[0019] v2 is the flow rate of the liquid in the capillary tube,

[0020] v3 is the flow rate of the liquid in the rough pipe;

[0021] According to the Reynolds number formula of non-circular pipe section: Re=VR 水 / v

[0022] V is the flow velocity of the liquid;

[0023] R 水 is the hydraulic radius;

[0024] v is the kinematic viscosity;

[0025] The lower critical Reynolds number of the concentric ring gap is 1100;

[0026] Hydraulic radius R 水 : R 水 =A / X;

[0027] A is the cross-sectional area of ​​water flow;

[0028] X is the wet perimeter;

[0029] Then: R 水 =(πR 2 -πr 2 ) / 2π(R+r);

[0030] R is the inner diameter of the large ring;

[0031] r is the outer diameter of the inner ring;

[0032] The equivalent diameter d is 4 times the hydraulic radius R 水

[0033] Then the equivalent diameter d is: 4×(Rr) / 2=2(Rr);

[0034] Substitute the equivalent diameter d into the formula Re=Vd / v and compare it with the Reynolds number 1100 to determine the radius of the cooling pipe.

[0035] Preferably, connecting rings are fixedly provided at both ends of the inner cooling pipe, and the connecting rings are directly welded to the outer side of the high-voltage wire harness by hot-melt welding.

[0036] Preferably, the thick pipe is located in the middle of the high-voltage wire harness, the thin pipes are connected in series at both ends of the thick pipe, and the thin pipes are located at the ends of the high-voltage wire harness, so that the liquid can be converted from tumbling to laminar flow and then to tumbling.

[0037] Preferably, a plurality of thick pipes and thin pipes are provided and are alternately distributed on the outside of the high-voltage wire harness, so that the liquid alternately switches from tumbling mixing to laminar smooth flow, thereby increasing the heat absorption effect on the wire harness.

[0038] Preferably, a clamping ring is installed on the connecting ring, and the clamping ring is an open structure. A clamping seat is fixedly installed on one side of the opening of the clamping ring, and a plug socket is fixedly installed on the other side of the opening.

[0039] One side of the card holder is provided with an installation slot for installing the socket. The socket is installed in the installation slot and can slide inside the installation slot.

[0040] A slot is also provided at the upper end of the socket, and the inner side wall of the slot away from the clamping ring is provided with a slope structure.

[0041] Bolts are installed on the base through threaded holes. When the bolts are installed inside the base, the bottom of the bolts contacts the slope. When the bolts move downward, the socket can move into the installation groove, so that the clamping ring shrinks.

[0042] Preferably, the bottom of the bolt is configured as an inverted conical or truncated cone structure, and the side slope of the conical or truncated cone structure is the same as the slope structure.

[0043] Preferably, an inner ring is provided inside the cooling pipe, and an opening is opened on the cooling pipe. By stretching the opening, a high-voltage wire harness can be placed in the inner ring of the cooling pipe. Two extension strips are fixedly provided on one side of the opening of the cooling pipe, and a flow port is provided between the two extension strips. An installation port is provided on the other side of the opening. When the opening is closed, the outer sides of the two extension strips just contact the installation port, and the opening is glued or hot-melt welded together.

[0044] An alarm device for a high-temperature brake harness of an electric vehicle comprises a temperature sensor. A placement groove is provided at one end of the high-voltage harness. Insulating ceramic is provided between the inner wall of the placement groove and the copper wire of the high-voltage harness. The outer side of the placement groove is provided as a closed structure. A placement hole is provided on the closed structure. The probe of the temperature sensor directly passes through the placement hole and is placed in the placement groove.

[0045] Compared with the prior art, the present invention has the following beneficial effects:

[0046] The present invention arranges a cooling pipe on the outside of the high-voltage wire harness, which can cool the high-voltage wire harness when the high-voltage wire harness generates heat. The cooling pipe is composed of a thick pipe and a thin pipe. The liquid flows faster in the thin pipe, causing the liquid to undergo wave-like disturbance or turbulence. The liquids can be mixed together, and when absorbing heat, the temperature of the liquids can be kept uniform, avoiding the situation where the temperature of the liquid close to the high-voltage wire harness is high and the temperature of the liquid far from the high-voltage wire harness is low, so that the liquid has a higher heat absorption effect.

[0047] The liquid flows slower in the thick pipe, and the laminar flow occurs, the flow is relatively smooth, the liquid is in contact with the high-pressure wire harness for a longer time, and can absorb more heat.

[0048] When the liquid enters the thin pipe from the thick pipe, the liquid undergoes wave-like disturbance and turbulence from the laminar flow, and the liquids can tumble and mix, so that the temperature of the low-temperature liquid and the high-temperature liquid close to the pipe is balanced, and when entering the thin pipe at the rear, it can absorb more heat.

[0049] The thin pipes are located at the water inlet pipe and the water outlet pipe. The liquid flow rate in the thin pipes is between the water inlet pipe (or water outlet pipe) and the thick pipe, and has a transitional effect. It can prevent the high-speed liquid in the water inlet pipe (or water outlet pipe) from directly entering the thick pipe, and avoid the occurrence of pipe vibration due to excessive changes in the liquid flow rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 It is the overall structure diagram of the present invention;

[0051] Figure 2 This is a structural diagram of a thin pipe-thick pipe-thin pipe according to the present invention;

[0052] Figure 3 A cross-sectional view of the staggered arrangement of thin pipes and thick pipes of the present invention;

[0053] Figure 4 It is a structural diagram of the staggered manner of thin pipes and thick pipes of the present invention;

[0054] Figure 5 It is a structural diagram of the clamping ring of the present invention;

[0055] Figure 6 It is a structural diagram of the card holder and the plug-in of the present invention;

[0056] Figure 7 This is a structural diagram of the opening of the cooling pipe of the present invention;

[0057] Figure 8 It is a radius marking diagram of the hydraulic radius of the present invention;

[0058] Fig. 9 This is a diagram showing the placement of the temperature sensor of the present invention;

[0059] Fig.10 It is the circuit diagram of the alarm system of the present invention.

[0060] In the figure: 1. high-voltage wiring harness; 2. thin pipe; 3. thick pipe; 4. water outlet pipe; 5. clamping ring; 6. connecting ring; 7. reflux box; 8. water pump; 9. heat sink fin; 10. cooling pipe; 11. socket; 12. connector; 13. bolt; 14. slot; 15. mounting slot; 16. temperature sensor; 17. insulating ceramic; 18. probe; 19. mounting port; 20. extension strip; 21. placement slot; 22. closing structure; 23. flow port. DETAILED DESCRIPTION

[0061] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0062] As shown in the figure, a high-temperature cooling brake harness for electric vehicles includes a high-voltage harness 1. A plurality of copper wires are arranged inside the high-voltage harness 1. The copper wires can conduct electrical energy. A cooling pipe is arranged outside the high-voltage harness 1. Figure 1-Figure 2 As shown, the cooling pipeline is composed of a thin pipeline 2 and a thick pipeline 3 connected in series, and a closed space is formed between the thin pipeline 2, the thick pipeline 3 and the high-voltage wiring harness 1, and the space is used for circulating cooling liquid.

[0063] like Figure 1 As shown, the thick pipe 3 is located in the middle of the high-voltage harness 1, the thin pipes 2 are connected in series at both ends of the thick pipe 3, and the thin pipes 2 are located at the ends of the high-voltage harness, so that the liquid can be converted from tumbling to laminar flow and then to tumbling.

[0064] A water inlet pipe is provided at one end of the cooling pipe, and a water outlet pipe 4 is provided at the other end. The radius of the water outlet pipe 4 is the same as that of the water inlet pipe. The water inlet pipe and the water outlet pipe 4 are both connected to a thin pipe 2. The liquid flow rate in the thin pipe 2 is faster than the liquid flow rate in the thick pipe 3. The liquid flows from the water inlet pipe into the thin pipe 2 at a higher flow rate. The flow rate change of the liquid is relatively small, which can avoid the occurrence of pipe vibration due to excessive drop in water flow rate.

[0065] When the liquid flows in the cooling pipe, the liquid flows from the thin pipe 2 into the thick pipe 3 and then into the thin pipe. The thin pipe is a transition stage, and the flow speed of the liquid in the thin pipe 2 is greater than the flow speed of the thick pipe 3. The flow speed V1 of the liquid in the water inlet pipe is the fastest, the flow speed V2 of the liquid in the thin pipe 2 is the second, and the flow speed V3 of the liquid in the thick pipe 3 is the slowest. When the liquid flows out of the water outlet pipe 4, it directly enters the water outlet pipe 4 from the thin pipe 2, which also avoids the pipe vibration caused by excessive changes in the liquid flow rate. The change in the flow speed of the liquid in the cooling pipe 2 from fast to slow and then to fast makes the speed change gradually instead of drastically, making the flow of liquid in the cooling pipe more stable.

[0066] When the liquid flows in the capillary 2, the flow velocity V2 of the liquid is relatively fast, and the liquid generates wave-shaped disturbance and turbulence in the capillary 2. The liquid can roll and mix in the capillary 2. When absorbing heat, the heat generated by the high-voltage bundle is directly absorbed by the liquid. In the process of absorbing heat, the liquid is disturbed and turbulent in the capillary 2, so that the liquid is stirred and mixed in the capillary 2. The higher stable liquid close to the high-voltage bundle and the low-temperature liquid far away from the high-voltage bundle are mixed together, thereby improving the heat absorption effect on the high-voltage bundle.

[0067] When the liquid flows in the thick pipe 3, the liquid flows slowly and is in a laminar flow state, which can increase the contact time between the liquid and the pipe and take away more heat. Moreover, the slowly flowing liquid is relatively stable, which can reduce the vibration of the liquid, thereby reducing the vibration of the pipe.

[0068] A cooling pipe 10 is connected between the water inlet pipe and the water outlet pipe 4. Figure 1 As shown, the cooling pipe 10 is arranged in an S shape, and a heat sink 9 is fixedly installed on the outer side of the cooling pipe 10. The cooling pipe 10 and the heat sink fins 9 are directly installed on the frame of the head of the car by bolts. A fan can also be installed on the heat sink fins 9. The fan is driven by the battery of the car or directly driven by the motor to dissipate heat from the heat sink fins.

[0069] A water pump 8 is also installed on the water inlet pipe. The water pump 8 is used to drive the liquid to flow in the cooling pipe. A reflux box 7 is also installed on the water outlet of the water pump 8. The reflux box 7 serves as a box for liquid circulation. The liquid can be mixed in the reflux box 7. At the same time, the liquid stored in the reflux box 7 can also supplement the insufficient cooling liquid caused by the evaporation of the liquid.

[0070] The thick pipe 3 and the thin pipe 2 can also be designed as a cross-placed structure, that is, a plurality of the thick pipe 3 and the thin pipe 2 are provided and alternately distributed on the outside of the high-voltage wire harness 1, such as Figure 3-Figure 4 Similarly, the thin pipe 2 is located at both ends of the high-voltage wire harness 1, and one side is connected to the water outlet pipe 4, and the other side is connected to the water inlet pipe.

[0071] Similarly, when the liquid flows in the thin pipe 2, the flow speed is relatively fast, and the liquid produces wave-shaped disturbances and turbulence in the thin pipe 2, while the liquid flows in the thick pipe at a relatively slow speed, and laminar flow occurs. The flow is relatively stable, which can make the liquid alternate from tumbling mixing to laminar smooth flow. Moreover, the thick pipe 3 sandwiches the thin pipe 2 in the middle. When the liquid in the thin pipe 2 is disturbed and turbulent, the thin pipe will vibrate slightly, while the thick pipe 3 maintains a stable state, so that the thin pipe 2 remains stable and the vibration of the thin pipe 2 is reduced. Therefore, while increasing the heat absorption effect on the wire harness, the stability of the pipe can be maintained and the vibration of the pipe can be avoided.

[0072] The connection structure between the thin pipe 2 and the thick pipe 3 is a tapered pipe, such as Figure 1-Figure 4 As shown, the diameter of the tapered tube changes gradually (becomes larger or smaller), and when the liquid flows between the thick tube 3 and the thin tube 2, the flow is more stable.

[0073] When determining the radius of the thin pipe 2 and the thick pipe 3, it is necessary to determine it according to the Reynolds number.

[0074] Critical Reynolds number is the number of fluids flowing through a pipe, a plate or a certain shape. When the fluid flows through a pipe, a plate or a certain shape, part or all of the fluid will change from laminar flow to turbulent flow as the conditions change. At this time, the friction coefficient, resistance coefficient, etc. will change significantly. The Reynolds number at the transition point is the critical Reynolds number. In other words, the Reynolds number corresponding to the transformation of the flow state of the constant flow in the circular pipe is called the critical Reynolds number.

[0075] During manufacturing, the outer diameter of the high-voltage wire harness 1 is a predetermined value, which can also be directly measured and set as r 线 ;

[0076] The radius of the water inlet pipe is r1, and the flow rate of the liquid is v1. The speed v1 is provided by the water pump 8. The radius r1 of the water inlet pipe and the speed v1 can be directly measured and are known conditions.

[0077] Assume that the radius of thin pipe 2 is set to r2, and the radius of thick pipe 3 is set to r3.

[0078] Since the water inlet pipe, thick pipe 2 and thin pipe 3 are connected in series, the flow rate Q of the three is the same.

[0079] v2×π×(r2 2 -r 线 2 )=v3×π×(r3 2 -r 线 2 )=v1×π×r1 2 ,

[0080] Where, v2 is the flow rate of the liquid in the narrow tube 2,

[0081] v3 is the flow rate of the liquid in the rough pipe 3;

[0082] It can be concluded that:

[0083]

[0084] Reynolds number formula for non-circular pipe section: Re=VR 水 / v

[0085] V is the flow velocity of the liquid;

[0086] R 水 is the hydraulic radius;

[0087] v is the kinematic viscosity, and the kinematic viscosity v can be directly obtained by looking up.

[0088] The lower critical Reynolds number of the concentric ring gap is 1100, that is, when the Reynolds number is less than 1100, the liquid is in a laminar state, and when the Reynolds number is greater than 1100, the liquid is in a turbulent state and wave-like disturbances will occur.

[0089] Hydraulic radius R 水 : R 水 =A / X;

[0090] A is the cross-sectional area of ​​water flow;

[0091] X is the wet perimeter;

[0092] Water flow cross-sectional area A = πR 2 -πr 2

[0093] Wetted perimeter X = 2πR + 2πr

[0094] Then: R 水 =(πR 2 -πr 2 ) / 2π(R+r)=(Rr) / 2;

[0095] Where: R is the inner diameter of the macro ring;

[0096] r is the outer diameter of the inner ring, where the outer diameter r of the inner ring is equal to the outer diameter r of the high-pressure tube bundle. 线 Same, such as Figure 8 shown.

[0097] The equivalent diameter d is 4 times the hydraulic radius R 水

[0098] Then the equivalent diameter d is: 4×(Rr) / 2=2(Rr) 3

[0099] Substituting the equivalent diameter d into the formula Re=Vd / v and comparing it with the Reynolds number 1100, the radius of the cooling pipe can be determined.

[0100] When the liquid flows in the thin pipe 2, the Reynolds number is: Re = v2d / v = 1100 4

[0101] The equivalent diameter d in the thin pipe 2 is d=2(r2-r 线 ) 5

[0102] Substituting formula 1 and formula 5 into formula 4, we can get:

[0103]

[0104] Under critical condition (v1×r1 / r2+r 线 )×2×1 / v=1100 6

[0105] The critical radius r of the capillary tube 2 at the critical time is obtained by formula 6: 2cr :r 2cr =(v1×r1 2 / 550v)-r 线 , where V1 is the flow rate of the liquid in the water inlet pipe, r1 is the radius of the water inlet pipe, v is the viscosity coefficient, and r 线 is the radius of the high-voltage harness, and the radius r of the thin pipe 2 under the critical state can be obtained 2cr .

[0106] According to the formula: (v1×r1 / r2+r 线 )×2×1 / v=1100, we can conclude that the maximum radius of the thin pipe 2 is r 2cr ,

[0107] If the radius is less than r 2cr , it means that the Reynolds number is greater than 1100, the Reynolds number of the liquid is greater than 1100, and the liquid is in a state of turbulent disturbance in the capillary tube.

[0108] Similarly, when the liquid flows in the thick pipe 3, the Reynolds number is:

[0109] Re=v3d / v=1100 7

[0110] The equivalent diameter d in the thin pipe 3 is: d = 2 (r3-r 线 ), 8

[0111] Substituting formula 2 and formula 8 into formula 7, we can get:

[0112]

[0113] Under critical state: (v1×r1 / r3+r 线 )×1 / 2×1 / v=1100 9

[0114] The critical radius r of the thick pipe at the critical time is obtained by formula 9 3cr :r 3cr =(v1×r1 2 / 550v)-r 线 , where v1 is the flow rate of the liquid in the water inlet pipe, r1 is the radius of the water inlet pipe, v is the viscosity coefficient, and r 线 is the radius of the high-voltage harness, and the critical radius r of the thick pipe under critical conditions can be obtained 3cr .

[0115] If the liquid is to flow in laminar flow in the thick pipe 3, the Reynolds number of the thick pipe 3 must be less than 1100, that is, the critical radius r 3cr is the minimum radius of the thick pipe.

[0116] During manufacturing, the radius r of the high voltage harness 1 线 is 10mm, the radius r1 of the water inlet pipe is 7mm, and the flow velocity v1 of the liquid in the water inlet pipe is 1000mm / s.

[0117] After checking, at 30 degrees Celsius, the viscosity coefficient of the coolant is: 4.75mm 2 / s, at 40 degrees Celsius, the viscosity coefficient of the coolant is: 3.44mm 2 / s, the viscosity coefficient v of the cooling liquid is taken as 4mm 2 / s. Substituting the above data into Formula 6, we can find the critical radius r cr :

[0118] (1000×7 2 )(550×4.075)-10=12.27mm;

[0119] From this we can get the critical radius r cr It is 12.27 mm.

[0120] When designing the thin pipe 2, it is sufficient to ensure that the radius of the thin pipe 2 is less than 12.27 mm, and the radius of the thick pipe is sufficient to be greater than 12.27 mm. It should be noted that the liquid flow in the critical state is unstable and its flow state is uncertain. Generally, the value in the critical state is not taken as the pipe radius.

[0121] Thus, the diameters of the thin pipe 2 and the thick pipe 3 can be determined so that the liquid in the thin pipe 2 can experience wave-like disturbances and turbulence, while the liquid in the thick pipe 3 is in a laminar stable state.

[0122] When installing the cooling pipe, the cooling pipe adopts two installation methods, one of which is directly pressed on the outside of the high-pressure pipe bundle 1. The specific structure of the cooling pipe is: the outer ends of the thin pipes 2 at both ends of the cooling pipe are fixedly installed with connecting rings 6. When installed together with the high-voltage wire harness 1, the high-voltage wire harness 1 is first inserted directly into the cooling pipe, so that the cooling pipe is located outside the high-voltage wire harness 1, and then the connecting ring 6 is welded to the high-voltage wire harness 1 by hot melt welding, so that the cooling pipe and the high-voltage wire harness are connected together. The two are fixed together and cannot be disassembled.

[0123] Another connection method is a movable connection method, that is, the cooling pipe itself is a circular cylindrical structure, such as Figure 7 As shown. An inner ring is provided inside the cooling pipe, and an opening is provided on the cooling pipe. A sealing sheet is provided on the side of the opening to prevent liquid leakage at the opening. By opening the opening, a high-voltage wire harness can be placed into the inner ring of the cooling pipe. Two extension strips 20 are fixedly provided on one side of the opening of the cooling pipe, and a flow port 23 is formed between the two extension strips 20. A mounting port 19 is provided on the other side of the opening. When the opening is closed, the outer sides of the two extension strips 20 just contact the mounting port 19, and the opening is glued or hot-melt welded together. When the openings are connected together, the cooling pipe forms an annular structure, and the liquid can flow through the flow port 23 in the cooling pipe.

[0124] This method is more flexible to use. By opening the opening, the high-voltage wire harness can be directly placed into the inner ring, which is more convenient when placing. When designing the radius of the thick pipe 3 and the thin pipe of the cooling pipe, the radius r of the high-voltage wire harness 线 The outer diameter of the inner ring needs to be used instead.

[0125] When the connection ring 6 is used, a clamping ring 5 is installed on the connection ring 6, and the clamping ring 5 is located near the cooling pipe. Figure 1 and Figure 2 As shown, the clamping ring 5 is an open structure, a clamping seat 11 is fixedly installed on one side of the opening of the clamping ring 5, and a plug socket 12 is fixedly installed on the other side of the opening. A mounting groove 15 is opened on one side of the clamping seat 11, and the mounting groove 15 is used to install the plug socket 12, and the plug socket 12 can slide horizontally inside the mounting groove 15.

[0126] The upper end of the socket 12 is also provided with a slot 14, and the inner side wall of the slot 14 away from the clamping ring 5 is set as a slope structure. Figure 5 and Figure 6 shown.

[0127] A threaded hole is provided on the upper portion of the holder 11, in which a bolt 13 is installed. When the bolt 13 is installed in the threaded hole (i.e., the bolt 13 is installed on the holder 11), the bottom of the bolt 13 contacts the slope and exerts an extrusion force on the slope. When the bolt 13 is rotated and moves downward under the action of the thread, an extrusion force is exerted on the slope during the downward movement of the bolt 13, so that the socket 12 can move toward the inside of the mounting groove 15, so that the clamping ring 5 shrinks, thereby exerting a clamping force on the connecting ring 6.

[0128] The connecting ring 6 generates a reaction force on the clamping ring 5, so that the socket 12 on the clamping ring 5 generates a reaction force on the bottom of the bolt 13, thereby preventing the bolt 13 from loosening and keeping the clamping ring 5 stable.

[0129] Before connecting the connecting ring 6 to the high-voltage wire harness 1, the connecting ring 6 is first hot-melted and welded to the outside of the high-voltage pipe bundle 1, and then the clamping ring 5 is installed on the connecting ring 6 so that the clamping ring 5 squeezes the connecting ring 6 to complete the connection between the connecting ring 6 and the high-voltage wire harness 1. When the coolant is passed into the cooling pipe, the pressure inside is relatively high, and the high pressure will cause outward pressure on the connecting ring 6, while the clamping ring 5 provides a clamping force on the connecting ring 6, thereby offsetting the pressure on the connecting ring 6, making the connecting ring 6 more firmly connected. After a long time, the connecting ring 6 leaks due to pressure.

[0130] When installing the clamping ring 5, separate the socket 12 from the clamping seat 11, clamp the clamping ring 5 on the outside of the connecting ring 6, then insert the socket 12 into the clamping seat 11, install the bolt 13 in the threaded hole, turn the bolt 13 to move downward, and squeeze the slope structure. Under the action of the slope, the socket 12 will move toward the inside of the installation groove 15, thereby clamping the connecting ring 6.

[0131] The bottom of the bolt 13 is set to an inverted cone or truncated cone structure, and the side slope of the cone or truncated cone structure is the same as the slope of the slope structure. When the bolt 13 is installed in the threaded hole, the side slope of the cone or truncated cone structure contacts the slope structure of the socket 12, increasing the contact area between the socket 12 and the bolt 13, and providing a more stable extrusion force to the socket.

[0132] An alarm device is also provided on the high voltage harness, including a temperature sensor 16. Fig. 9As shown, a placement groove 21 is provided at one end of the high-voltage wire harness 1 located outside the cooling pipe, and an insulating ceramic 17 is provided between the inner wall of the placement groove 21 and the copper wire of the high-voltage wire harness 1. The outer side of the placement groove 21 is provided with a closed structure 22. The closed structure 22 is made of rubber material. The rubber material 15 is relatively soft. A placement hole is provided on the closed structure 22. The probe of the temperature sensor directly passes through the placement hole and is placed in the placement groove 21. The closed structure 22 can squeeze the probe 18 so that the probe 18 is placed relatively stably in the placement groove 21.

[0133] The temperature alarm circuit, such as Fig.10 As shown. The temperature detection trigger circuit includes a time base circuit IC1, a potentiometer Rp, a resistor R1 and a thermistor RT. The thermistor RT is a negative temperature coefficient thermistor, and its resistance gradually decreases with the increase of temperature. IC2 is an audio integrated circuit KD9561, which can produce 4 kinds of analog sounds, namely police car sound, fire truck sound, ambulance sound and machine gun sound. IC3 is an audio power amplifier, which can amplify weak audio signals and drive speaker B to sound. The specific working process is as follows:

[0134] When the temperature does not reach the preset value, since the resistance of the temperature sensor RT is greater than 1 / 2Rp+R1, the potential of the trigger terminal ② of IC1 is higher than 1 / 3G2V, making the ③ pin of IC1 low, the diode VD is cut off, IC2 does not get the power supply voltage and has no audio signal output, and the speaker B is silent. When the temperature rises to the preset value, the resistance of RT will be less than 1 / 2Rp+R1, the potential of the trigger terminal ② of IC1 is lower than 1 / 3G2V, the output terminal ③ of IC1 jumps from low potential to high level, the diode VD is turned on, and a DC voltage of about 5V200mA is output. The DC voltage is filtered by capacitor C2 and supplied to IC2. At this time, the siren signal generated by IC2 is output from the OUT terminal, coupled to the input terminal ③ of IC3 through C3 for power amplification. The amplified audio signal is output from the ⑤ pin of IC3, and finally drives the speaker B through capacitor C6 to emit a loud siren alarm sound, thereby achieving the alarm function.

[0135] When an alarm sounds, the water pump 8 can be turned on to supply power to the water pump 8, which drives the coolant to flow in the water inlet pipe and the cooling pipe, thereby cooling the high-voltage wiring harness.

[0136] 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. A high temperature cooling brake harness for electric vehicles, characterized in that: The invention comprises a high-voltage wire harness (1), wherein a cooling pipe is arranged outside the high-voltage wire harness (1), wherein the cooling pipe is composed of a thin pipe (2) and a thick pipe (3) connected in series, wherein a circulation space for circulating cooling liquid is formed between the thin pipe (2), the thick pipe (3) and the high-voltage wire harness (1), and the thin pipe (2) is located at both ends of the high-voltage wire harness (1); A water inlet pipe is provided at one end of the cooling pipe, and a water outlet pipe (4) is provided at the other end; a cooling pipe (10) is connected between the water inlet pipe and the water outlet pipe (4); a heat dissipation fin (9) is fixedly installed on the outside of the cooling pipe (10); a water pump (8) is also installed on the water inlet pipe, and the water pump (8) is used to drive liquid to flow in the cooling pipe; When the liquid flows in the capillary (2), the liquid generates wave-shaped disturbances and turbulence in the capillary (2), and the liquid can roll and mix in the capillary (2); When the liquid flows in the thick pipe (3), it is in a laminar flow state. The liquid flows relatively slowly, which can increase the contact time between the liquid and the pipe and take away more heat.

2. The electric vehicle high temperature cooling brake harness according to claim 1, characterized in that: The outer diameter of the high-voltage wire harness (1) is a fixed value during production, which is set as r 线 , The radius of the water inlet pipe is r1, and the flow rate of the liquid is v1. The speed v1 is provided by the water pump (8), which is a known condition. The radius of the thin pipe (2) is set to r2, and the radius of the thick pipe (3) is set to r3. Since the water inlet pipe, the thick pipe (2) and the thin pipe (3) are connected in series, the flow rates Q of the three are the same. v2×π×(r2 2 -r 线 2 )=v3×π×(r3 2 -r 线 2 )=v1×π×r1 2 , v2 is the flow rate of the liquid in the narrow tube (2), v3 is the flow rate of the liquid in the rough pipe (3); According to the Reynolds number formula of non-circular pipe section: Re=VR 水 / v V is the flow velocity of the liquid; R 水 is the hydraulic radius; v is the kinematic viscosity; The lower critical Reynolds number of the concentric ring gap is 1100; Hydraulic radius R 水 : R 水 =A / X; A is the cross-sectional area of ​​water flow; X is the wet perimeter; Then: R 水 = (πR 2 - πr 2 ) / 2π(R + r); R is the inner diameter of the large ring; r is the outer diameter of the inner ring; The equivalent diameter d is 4 times the hydraulic radius R 水 Then the equivalent diameter d is: 4×(Rr) / 2=2(Rr); Substitute the equivalent diameter d into the formula Re=Vd / v and compare it with the Reynolds number 1100 to determine the radius of the cooling pipe.

3. The electric vehicle high temperature cooling brake harness according to claim 1, characterized in that: Connecting rings (6) are fixedly provided at both ends of the cooling pipe, and the connecting rings (6) are directly welded to the outside of the high-voltage wire harness (1) by means of hot-melt welding.

4. The electric vehicle high temperature cooling brake harness according to claim 1, characterized in that: The thick pipe (3) is located in the middle of the high-voltage wire harness (1), the thin pipes (2) are connected in series at both ends of the thick pipe (3), and the thin pipes (2) are located at the ends of the high-voltage wire harness, so that the liquid can be transformed from tumbling to laminar flow and then to tumbling.

5. The electric vehicle high temperature cooling brake harness according to claim 1, characterized in that: A plurality of thick pipes (3) and thin pipes (2) are provided and are alternately distributed outside the high-voltage wire harness (1), so that the liquid is alternately converted from tumbling mixing to laminar smooth flow, thereby increasing the heat absorption effect on the wire harness.

6. The electric vehicle high temperature cooling brake harness according to claim 3, characterized in that: A clamping ring (5) is installed on the connecting ring (6). The clamping ring (5) is an open structure. A clamping seat (11) is fixedly installed on one side of the opening of the clamping ring (5), and a plug-in seat (12) is fixedly installed on the other side of the opening. A mounting groove (15) for mounting the plug socket (12) is provided on one side of the card seat (11). The plug socket (12) is mounted in the mounting groove (15) and can slide inside the mounting groove (15). The upper end of the plug socket (12) is also provided with a slot (14), and the inner side wall of the slot (14) away from the clamping ring (5) is arranged as a slope structure. A bolt (13) is installed on the base (11) through a threaded hole. When the bolt (13) is installed inside the base (1), the bottom of the bolt (13) contacts the slope. When the bolt (13) moves downward, the socket (12) can move into the installation groove (15), so that the clamping ring (5) is reduced.

7. The electric vehicle high temperature cooling brake harness according to claim 6, characterized in that: The bottom of the bolt (13) is configured as an inverted conical or truncated cone structure, and the side slope of the conical or truncated cone structure is the same as the slope structure.

8. The electric vehicle high temperature cooling brake harness according to claim 1, characterized in that: An inner ring is arranged inside the cooling pipe, and an opening is provided on the cooling pipe. By stretching the opening, a high-voltage wire harness can be placed in the inner ring of the cooling pipe. Two extension strips (20) are fixedly arranged on one side of the opening of the cooling pipe, and a flow port (23) is provided between the two extension strips (20). An installation port (19) is arranged on the other side of the opening. When the opening is closed, the outer sides of the two extension strips (20) just contact the installation port (19), and the opening is glued or hot-melt welded together.

9. An electric vehicle high temperature brake harness alarm device, using an electric vehicle high temperature cooling brake harness as claimed in any one of claims 1 to 8, characterized in that: The invention comprises a temperature sensor (16), wherein a placement groove (21) is provided at one end of the high-voltage wire harness (1), an insulating ceramic (17) is provided between the inner wall of the placement groove (21) and the copper wire of the high-voltage wire harness (1), the outer side of the placement groove (21) is provided with a closed structure (22), a placement hole is provided on the closed structure (22), and a probe (18) of the temperature sensor directly passes through the placement hole and is placed in the placement groove (21).

Images