Retarder cooling device

Abstract

The present invention relates to a retarder cooling device, comprising a regulating valve and a driving member. The regulating valve comprises a first valve body, a valve core and a valve stem, wherein the valve stem is connected to the valve core, and the valve core is provided with a valve core hole. The first valve body is provided with an air flow channel, wherein the valve core is rotatably arranged in the air flow channel, and one end of the air flow channel is used to communicate with an air storage cylinder. One end of the driving member is connected to the valve stem, and the driving member can drive the regulating valve to rotate to adjust the air flow through the regulating valve. When the temperature of the retarder rises, the driving member drives the valve core to rotate. When the temperature of the retarder is higher than a preset temperature value, the valve core rotates to a certain angle so that the valve core hole is connected with the air flow channel, so that the high-pressure gas in the air storage cylinder can be sprayed to the retarder through the regulating valve, thereby cooling the retarder, thereby extending the service life of the retarder and reducing the occurrence of vehicle fire accidents. When the temperature of the retarder decreases, the valve core closes the air flow channel under the action of the driving member, and the retarder cooling device stops working at this time.

Description

Technical Field

[0001] The present invention relates to the technical field of retarders, and in particular to a retarder cooling device. Background Art

[0002] The eddy current retarder is an auxiliary braking system that is installed between the vehicle drive axle and the gearbox, and achieves contactless braking through the principle of electromagnetic induction. The eddy current retarder is generally composed of a stator, a rotor and a fixed bracket. When working, the stator coil is energized to generate a magnetic field, and the rotor rotates and cuts the magnetic lines of force generated by the stator, thereby generating a vortex-shaped induced current in the rotor disk. The stator applies an electromagnetic force to the rotor that hinders the rotation of the rotor, thereby generating a braking torque. At the same time, eddy currents flow in the rotor disk, and under the action of the resistance thermal effect, the kinetic energy of the vehicle is finally converted into heat energy through electromagnetic induction and resistance heating.

[0003] In order to reduce the temperature of the retarder, the traditional method is to dissipate the heat around the rotor through the fan blades. However, when the vehicle is going down a long slope or the retarder is working with a large current, it is easy to cause the temperature of the retarder to be too high, thereby shortening the service life of the stator. In addition, since the retarder and the oil seal end are close to each other, it is easy to cause a vehicle fire accident, resulting in serious losses. Summary of the invention

[0004] Based on this, it is necessary to provide a retarder cooling device, which can reduce the temperature of the retarder to extend the service life of the retarder and reduce the occurrence of vehicle fire accidents.

[0005] A retarder cooling device, comprising:

[0006] A regulating valve, the regulating valve comprising a first valve body, a valve core and a valve stem, the valve stem being connected to the valve core, the valve core being provided with a valve core hole; the first valve body being provided with an air flow channel, the valve core being rotatably arranged in the air flow channel, one end of the air flow channel being used for communicating with an air storage cylinder;

[0007] A driving member is connected to the valve stem, and the driving member can drive the valve core to rotate to adjust the air flow passing through the regulating valve.

[0008] The above retarder cooling device has at least the following advantages:

[0009] The above scheme provides a retarder cooling device, in which one end of the driving member is connected to the valve stem. When the temperature in the retarder rises, the driving member drives the valve core to rotate in the air flow channel. When the temperature in the retarder is higher than the preset temperature value, the valve core rotates to a certain angle so that the valve core hole is connected to the air flow channel, so that the high-pressure gas in the gas storage cylinder can be sprayed to the retarder through the regulating valve, thereby cooling the retarder to extend the service life of the retarder and reduce the occurrence of vehicle fire accidents. As the temperature in the retarder continues to rise, the overlap between the valve core hole and the air flow channel increases, and the amount of high-pressure gas passing through the regulating valve increases, so that the cooling effect of the retarder is more significant. When the temperature in the retarder decreases, the valve core closes the air flow channel under the action of the driving member, and the retarder cooling device stops working.

[0010] The technical solution is further described below:

[0011] In one embodiment, the driving member is a bimetallic spiral spring.

[0012] In one embodiment, the outer end of the bimetallic spiral spring is provided with a first bending portion, and the inner end of the bimetallic spiral spring is provided with a second bending portion; the side wall of the valve body is provided with a first limiting groove, and the first bending portion is located in the first limiting groove; the end of the valve stem away from the valve core is provided with a second limiting groove, and the second bending portion is located in the second limiting groove.

[0013] In one embodiment, the valve body is provided with a accommodating cavity, and the side wall of the accommodating cavity is provided with a first protrusion and a second protrusion, and the first protrusion and the second protrusion are arranged opposite to each other; after thermal expansion, the outer ring of the bimetallic spiral spring can be pressed against the first protrusion and the second protrusion.

[0014] In one of the embodiments, the retarder cooling device further includes an injection assembly, and the injection assembly is arranged at the other end of the air flow channel.

[0015] In one embodiment, the regulating valve also includes a first connector and a second connector, the first connector is arranged at one end of the air flow channel, the first connector is used to connect the air storage cylinder, the second connector is arranged at the other end of the air flow channel, and the second connector is connected to the injection assembly.

[0016] In one embodiment, the jet assembly includes a main body, a socket, an electromagnetic coil, a return spring, a third valve body and an axis pin, the electromagnetic coil is electrically connected to the socket; the main body is provided with a jet channel, one end of the jet channel is the jet end, the third valve body is movably arranged at the jet end of the jet channel, and the axis pin and the third valve body are connected; one end of the return spring abuts against the third valve body, and the other end of the return spring abuts against the main body.

[0017] In one of the embodiments, the retarder cooling device further includes an alarm, the alarm is provided with a temperature threshold, and the alarm is electrically connected to the socket.

[0018] In one of the embodiments, the retarder cooling device further includes a bridge sensor, the bridge sensor includes a circuit composed of a thermistor, and the socket is electrically connected to the bridge sensor.

[0019] In one of the embodiments, the retarder cooling device further comprises a mounting frame, one end of the mounting frame is connected to the regulating valve, and the other end of the mounting frame is used to connect to a brake drum camshaft support. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of a retarder cooling device according to an embodiment of the present invention;

[0021] Figure 2 It is a schematic diagram of the structure explosion of a retarder cooling device according to an embodiment of the present invention;

[0022] Figure 3 The figure is a schematic diagram of the structure of a regulating valve in a retarder cooling device according to an embodiment of the present invention.

[0023] Description of reference numerals:

[0024] 10. regulating valve, 11. valve body, 111. air flow channel, 112. accommodating chamber, 113. first convex body, 1131. first limiting groove, 114. second convex body, 115. first valve body, 116. second valve body, 117. fastener, 118. sealing ring, 119. gasket, 12. valve core, 121. valve core hole, 13. valve stem, 131. second limiting groove, 20. driving member, 21. first bending portion, 22. second bending portion, 23. limiting portion. DETAILED DESCRIPTION

[0025] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific implementation disclosed below.

[0026] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The various technical features of the above-described embodiments can be combined arbitrarily. In order to make the description concise, all possible combinations of the various technical features in the above-described embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0028] See also Figure 1 and Figure 2 The retarder cooling device in one embodiment includes a regulating valve 10 and a driving member 20. The regulating valve 10 includes a valve body 11, a valve core 12 and a valve stem 13. The valve stem 13 is connected to the valve core 12. The valve core 12 is provided with a valve core hole 121. The valve body 11 is provided with an air flow channel 111. The valve core 12 is rotatably arranged in the air flow channel 111. One end of the air flow channel 111 is used to connect to the air storage cylinder. The driving member 20 is connected to the valve stem 13. The driving member 20 can drive the valve core 12 to rotate in the air flow channel 111 to adjust the air flow through the regulating valve 10.

[0029] In the above-mentioned retarder cooling device, the driving member 20 is connected to the valve stem 13. When the temperature in the retarder rises, the driving member 20 drives the valve core 12 to rotate in the air flow channel 111. When the temperature in the retarder is higher than the preset temperature value, the valve core 12 rotates to a certain angle so that the valve core hole 121 is connected to the air flow channel 111, so that the high-pressure gas in the gas reservoir can be sprayed to the retarder through the regulating valve 10, thereby cooling the retarder to extend the service life of the retarder and reduce the occurrence of vehicle fire accidents. As the temperature in the retarder continues to rise, the overlap between the valve core hole 121 and the air flow channel 111 increases, and the amount of high-pressure gas passing through the regulating valve 10 increases, so that the cooling effect of the retarder is more significant. When the temperature in the retarder decreases, the valve core 12 closes the air flow channel 111 under the action of the driving member 20, and the retarder cooling device stops working.

[0030] Specifically, see Figure 1 and Figure 2 The regulating valve 10 further includes a sealing ring 118 and a gasket 119. The sealing ring 118 is correspondingly arranged at the position of the valve core hole 121, and the gasket 119 is arranged on the sealing ring 118. When the temperature in the retarder is lower than the preset temperature value, the driving member 20 drives the valve core 12 to rotate in the air flow channel 111, so that the valve core 12 presses against the side wall of the air flow channel 111, thereby making the valve core hole 121 not connected to the air flow channel 111. By arranging the sealing ring 118 and the gasket 119 at the position of the valve core hole 121, when the temperature in the retarder is lower than the preset temperature value, the sealing ring 118 and the gasket 119 pressed against the side wall of the air flow channel 111 can improve the air tightness of the regulating valve 10 and prevent high-pressure gas from spraying into the retarder.

[0031] In one embodiment, the above-mentioned driving member 20 includes a motor and a controller, and the controller is electrically connected to the motor. Specifically, the vehicle is provided with a temperature sensor, and the temperature sensor is electrically connected to the controller. The temperature sensor measures the temperature in the retarder. When the measured temperature value is higher than the preset temperature value, the controller controls the motor to rotate, thereby driving the valve core 12 to rotate in the air flow channel 111 to adjust the air flow through the regulating valve 10. It is understandable that when the temperature in the retarder is higher than the preset temperature value, the valve core 12 rotates to a certain angle so that the valve core hole 121 is connected to the air flow channel 111, so that the high-pressure gas in the gas reservoir can be sprayed to the retarder through the regulating valve 10, thereby cooling the retarder, so as to extend the service life of the retarder and reduce the occurrence of vehicle fire accidents. When the temperature in the retarder is reduced, the valve core 12 closes the air flow channel 111 under the drive of the motor, and the retarder cooling device stops working at this time. Of course, in other embodiments, the driving member 20 can also be a high-pressure cylinder, and the high-pressure cylinder is electrically connected to the controller. When the temperature value measured by the temperature sensor is higher than the preset temperature value, the controller controls the high-pressure cylinder to start working, so that the high-pressure cylinder drives the valve core 12 to rotate in the air flow channel 111, thereby adjusting the air flow passing through the regulating valve 10.

[0032] In another embodiment, see Figure 1 and Figure 2 , the driving member 20 is a bimetallic spiral spring. Specifically, the outer end of the bimetallic spiral spring is connected to the valve body 11, and the inner end of the bimetallic spiral spring is connected to the valve stem 13. It can be understood that the inner end of the bimetallic spiral spring refers to the end of the inner ring of the spiral spring, and the outer end of the bimetallic spiral spring refers to the end of the outer ring of the spiral spring. The bimetallic spiral spring includes two or more metals with suitable properties. When the temperature of the retarder changes, due to the different thermal expansion coefficients of different metals, the metal layer with a high thermal expansion coefficient will bend toward the side of the metal layer with a low thermal expansion coefficient. In this embodiment, when the retarder is in normal operation, due to the cooling effect of the fan, the temperature of the retarder will not exceed the preset temperature value, so the retarder cooling device does not work. As the temperature in the retarder gradually increases, the bimetallic spiral spring expands due to heat and stretches in the circumferential direction. Since the outer end of the bimetallic spiral spring limits movement, the inner end of the bimetallic spiral spring drives the valve core 12 to rotate in the air flow channel 111. When the temperature in the retarder rises to a certain value, under the action of the driving member 20, the valve core 12 rotates to a certain angle, the valve core hole 121 is connected to the air flow channel 111, and the high-pressure gas in the gas reservoir is sprayed to the retarder through the regulating valve 10, thereby cooling the retarder to extend the service life of the retarder and reduce the occurrence of vehicle fire accidents. When the temperature in the retarder decreases, under the action of the bimetallic spiral spring, the valve core 12 rotates and closes the air flow channel 111, and the retarder cooling device stops working.

[0033] For further information, see Figures 1 to 3 , a first bending portion 21 is provided at the outer end of the bimetallic scroll spring, and a second bending portion 22 is provided at the inner end of the bimetallic scroll spring. A first limiting groove 1131 is provided on the side wall of the valve body 11, and the first bending portion 21 is located in the first limiting groove 1131. A second limiting groove 131 is provided at one end of the valve stem 13 away from the valve core 12, and the second bending portion 22 is located in the second limiting groove 131. By setting the first bending portion 21 in the first limiting groove 1131 and the second bending portion 22 in the second limiting groove 131, the two ends of the bimetallic scroll spring are connected to the valve body 11 and the valve stem 13 respectively, so that the bimetallic scroll spring can drive the valve core 12 to rotate in the air flow channel 111 to adjust the air flow through the regulating valve 10. As the temperature in the retarder gradually increases, the bimetallic scroll spring expands due to heat and stretches in the circumferential direction. Since the outer end of the bimetallic scroll spring limits movement, the inner end of the bimetallic scroll spring drives the valve core 12 to rotate in the air flow channel 111. When the temperature in the retarder rises to a certain value, under the action of the drive member 20, the valve core 12 rotates to a certain angle, the valve core hole 121 is connected to the air flow channel 111, and the high-pressure gas in the air storage cylinder is sprayed to the retarder through the regulating valve 10, thereby cooling the retarder to extend the service life of the retarder and reduce the occurrence of vehicle fire accidents. When the temperature in the retarder decreases, the bimetallic scroll spring retracts and drives the valve core 12 to rotate to close the air flow channel 111, and the retarder cooling device stops working.

[0034] Specifically, see Figure 2 and Figure 3 The outer end of the bimetallic spiral spring is provided with a limit portion 23, and the size of the limit portion 23 is larger than the size of the first limit groove 1131. When the temperature in the retarder decreases, the bimetallic spiral spring retracts and moves to the side close to the valve stem 13. The limit portion 23 can limit the moving distance of the outer end of the bimetallic spiral spring, so as to prevent the bimetallic spiral spring from slipping out of the first limit groove 1131 and affecting the use of the retarder cooling device.

[0035] For further information, see Figure 1 and Figure 3, the valve body 11 is provided with a receiving chamber 112, and the receiving chamber 112 is used to place the bimetallic spiral spring. The side wall of the receiving chamber 112 is provided with a first convex body 113 and a second convex body 114, and the first convex body 113 and the second convex body 114 are arranged opposite to each other. The bimetallic spiral spring expands due to heat, and the outer ring of the bimetallic spiral spring can press against the first convex body 113 and the second convex body 114. As the temperature in the retarder increases, the bimetallic spiral spring expands due to heat and stretches in the circumferential direction. Since the first convex body 113 and the second convex body 114 are provided in the receiving chamber 112, the outer ring of the bimetallic spiral spring presses against the first convex body 113 and the second convex body 114, so that the bimetallic spiral spring drives the valve core 12 to rotate in the air flow channel 111 to adjust the air flow through the regulating valve 10. In this embodiment, the first limiting groove 1131 is provided on the first convex body 113 or the second convex body 114.

[0036] Specifically, see Figure 2 and Figure 3 The bottom of the accommodating chamber 112 is provided with a mounting hole, which is adapted to the size of the valve stem 13. The valve stem 13 extends from the airflow channel 111 into the accommodating chamber 112 through the mounting hole, so that the inner end of the bimetallic spiral spring is conveniently arranged on the valve stem 13, so that the valve core 12 is driven to rotate in the airflow channel 111 by the bimetallic spiral spring to adjust the air flow passing through the regulating valve 10.

[0037] In one embodiment, see Figure 2 and Figure 3 The valve body 11 includes a first valve body 115 and a second valve body 116. The first valve body 115 and the second valve body 116 are detachably connected, which is convenient for installing the valve core 12 and the valve stem 13, and is also convenient for inspection and maintenance. Specifically, the first valve body 115 is provided with a first fastening hole, and the second valve body 116 is provided with a second fastening hole at a corresponding position, and the first valve body 115 and the second valve body 116 are connected together by a fastener 117. In this embodiment, the fastener 117 includes a screw and a nut, and the screw is inserted into the first fastening hole and the second fastening hole, and the first valve body 115 and the second valve body 116 are fastened by the nut. Of course, in other embodiments, the valve body 11 can also be an integrally formed structure, which is not limited to this.

[0038] Specifically, one end of the airflow channel 111 is an air inlet end, and the air reservoir is disposed at the air inlet end of the airflow channel 111, and the air reservoir is connected to the airflow channel 111. The other end of the airflow channel 111 is an air outlet end, and the jet assembly is disposed at the air outlet end of the airflow channel 111. In this embodiment, the air inlet end of the airflow channel 111 is disposed at the first valve body 115, and the air outlet end of the airflow channel 111 is disposed at the second valve body 116, and the air inlet end and the air outlet end of the airflow channel 111 are disposed opposite to each other.

[0039] Furthermore, the retarder cooling device also includes an injection assembly, which is arranged at the other end of the air flow channel 111. As the temperature of the retarder increases, the driving member 20 drives the valve core 12 to rotate in the air flow channel 111, so that the valve core hole 121 is connected with the air flow channel 111, so that the high-pressure gas in the gas reservoir enters the injection assembly through the regulating valve 10. The high-pressure gas is sprayed toward the retarder through the injection assembly, which can cool the retarder, thereby effectively extending the service life of the retarder and reducing the occurrence of vehicle fire accidents.

[0040] Specifically, the regulating valve 10 also includes a first connector and a second connector. The first connector is arranged at one end of the air flow channel 111, and the first connector is used to connect the air cylinder. The second connector is arranged at the other end of the air flow channel 111, and the second connector is connected to the jet assembly. It can be understood that the first connector is arranged at the air inlet end of the air flow channel 111, that is, the first connector is arranged at the first valve body 115; the second connector is arranged at the air outlet end of the air flow channel 111, that is, the second connector is arranged at the second valve body 116. The first connector facilitates the installation of the air cylinder at one end of the valve body 11, and the second connector facilitates the installation of the jet assembly at the other end of the valve body 11. In this embodiment, the air inlet end and the air outlet end of the air flow channel 111 are provided with threads, and the first connector and the second connector are threadedly connected to the valve body 11.

[0041] Furthermore, the jet assembly includes a body, a socket, an electromagnetic coil, a return spring, a third valve body and an axial pin. The electromagnetic coil is electrically connected to the socket. When the socket is powered on, the electromagnetic coil generates electromagnetic attraction; when the socket is powered off, the electromagnetic coil loses the electromagnetic attraction. The body is provided with a jet channel, one end of the jet channel is the jet end, and the third valve body is movably arranged at the jet end of the jet channel. The axial pin and the third valve body are connected. One end of the return spring abuts against the third valve body, and the other end of the return spring abuts against the body. It can be understood that the axial pin is arranged at one end of the third valve body away from the return spring. When the temperature in the retarder is higher than the preset temperature value, the socket is powered on, and current passes through the electromagnetic coil, so that the electromagnetic coil generates electromagnetic attraction. The electromagnetic attraction can overcome the elastic force of the return spring and attract the third valve body, so that the third valve body and the axial pin move in the jet channel toward one end close to the electromagnetic coil, so that the jet channel can be opened. The high-pressure gas in the gas reservoir enters the jet assembly through the regulating valve 10 and is sprayed toward the retarder from the jet channel, thereby cooling the retarder to extend the service life of the retarder and reduce the occurrence of vehicle fire accidents. When the temperature in the retarder is lower than the preset temperature value, the socket is powered off, the electromagnetic coil loses its electromagnetic attraction, and under the action of the return spring, the third valve body and the shaft needle move away from the end of the electromagnetic coil in the jet channel. At this time, the jet channel is closed and the retarder cooling device stops working.

[0042] In one embodiment, the retarder cooling device also includes an alarm, which is provided with a temperature threshold, and the alarm is electrically connected to the socket. When the temperature of the retarder rises to the temperature threshold, the socket is energized, and the electromagnetic coil generates electromagnetic attraction. The electromagnetic attraction can attract the third valve body, causing the third valve body to move toward the end close to the electromagnetic coil to open the jet channel. The high-pressure gas in the gas cylinder can enter the jet channel through the regulating valve 10 and spray toward the retarder, thereby reducing the temperature of the retarder, extending the service life of the retarder, and reducing the occurrence of vehicle fire accidents. When the temperature in the retarder is lower than the preset temperature value, the socket is powered off, and the electromagnetic coil loses its electromagnetic attraction. Under the action of the return spring, the third valve body moves toward the end away from the electromagnetic coil, at which time the jet channel is closed and the retarder cooling device stops working.

[0043] In another embodiment, the retarder cooling device further comprises a bridge sensor. The bridge sensor comprises a circuit composed of a thermistor, and the socket is electrically connected to the bridge sensor. When the temperature of the retarder rises, the thermistor in the bridge circuit is affected, the balance of the bridge circuit is destroyed, and current is output in the circuit. Since the socket is electrically connected to the thermistor bridge circuit, the socket is in an energized state at this time, and the electromagnetic coil generates electromagnetic attraction after being energized. The third valve body is attracted by the electromagnetic attraction, and the third valve body is moved toward the electromagnetic coil to open the jet passage. The high-pressure gas in the gas cylinder can enter the jet passage through the regulating valve 10 and spray toward the retarder, thereby reducing the temperature of the retarder, extending the service life of the retarder, and reducing the occurrence of vehicle fire accidents. When the temperature of the retarder decreases, the bridge circuit is rebalanced, and there is no current output in the circuit. At this time, the socket is in a power-off state, and the electromagnetic coil has no electromagnetic attraction. Under the action of the return spring, the third valve body moves toward the end away from the electromagnetic coil to close the jet passage, and the retarder cooling device stops cooling.

[0044] Furthermore, the retarder cooling device also includes a mounting frame. One end of the mounting frame is connected to the regulating valve 10, and the other end of the mounting frame is used to connect the brake drum camshaft support. Specifically, one end of the mounting frame is connected to the valve body 11 of the regulating valve 10. The mounting frame facilitates the mounting of the regulating valve 10 on the brake drum camshaft support, thereby improving the stability of the regulating valve 10.

[0045] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A retarder cooling device, characterized in that: include: A regulating valve, the regulating valve comprising a valve body, a valve core and a valve stem, the valve stem being connected to the valve core, the valve core being provided with a valve core hole; the valve body being provided with an air flow channel, the valve core being rotatably arranged in the air flow channel, one end of the air flow channel being used to communicate with an air storage cylinder; the valve body comprising a first valve body and a second valve body, the first valve body being detachably connected to the second valve body; A driving member, wherein the driving member is connected to the valve stem, and the driving member can drive the valve core to rotate so as to adjust the amount of air passing through the regulating valve. The driving member is a bimetallic scroll spring, and a first bending portion is provided at the outer end of the bimetallic scroll spring, and a second bending portion is provided at the inner end of the bimetallic scroll spring; a first limiting groove is provided on the side wall of the valve body, and the first bending portion is located in the first limiting groove; a second limiting groove is provided at one end of the valve stem away from the valve core, and the second bending portion is located in the second limiting groove.

2. The retarder cooling device according to claim 1, characterized in that: A limiting portion is provided at the outer end of the bimetallic spiral spring, and a size of the limiting portion is larger than a size of the first limiting groove.

3. The retarder cooling device according to claim 1, characterized in that: The valve body is provided with a receiving cavity, and the side wall of the receiving cavity is provided with a first convex body and a second convex body, and the first convex body and the second convex body are arranged opposite to each other; after thermal expansion, the outer ring of the bimetallic spiral spring can press against the first convex body and the second convex body.

4. The retarder cooling device according to claim 1, characterized in that: It also includes an injection assembly, which is arranged at the other end of the airflow channel.

5. The retarder cooling device according to claim 4, characterized in that: The regulating valve also includes a first joint and a second joint, the first joint is arranged at one end of the air flow channel, the first joint is used to connect the air storage cylinder, the second joint is arranged at the other end of the air flow channel, and the second joint is connected to the injection assembly.

6. The retarder cooling device according to claim 4, characterized in that: The jet assembly includes a main body, a socket, an electromagnetic coil, a return spring, a third valve body and an axis pin, the electromagnetic coil is electrically connected to the socket; the main body is provided with a jet channel, one end of the jet channel is the jet end, the third valve body is movably arranged at the jet end of the jet channel, and the axis pin and the third valve body are connected; one end of the return spring abuts against the third valve body, and the other end of the return spring abuts against the main body.

7. The retarder cooling device according to claim 6, characterized in that: It also includes an alarm, which is provided with a temperature threshold and is electrically connected to the socket.

8. The retarder cooling device according to claim 6, characterized in that: A bridge sensor is also included. The bridge sensor includes a circuit composed of a thermistor, and the socket is electrically connected to the bridge sensor.

9. The retarder cooling device according to any one of claims 1 to 8, characterized in that: The regulating valve further comprises a sealing ring and a gasket, wherein the sealing ring is arranged in the valve core hole, and the gasket is arranged on the sealing ring.

10. The retarder cooling device according to any one of claims 1 to 8, characterized in that: It also includes a mounting frame, one end of which is connected to the regulating valve, and the other end of which is used to connect to a brake drum camshaft support.

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