A vehicle air conditioning heating block

Abstract

The present invention relates to the technical field of vehicle air conditioners, and in particular to a vehicle air conditioner heating block. The vehicle air conditioner heating block comprises an outer shell, and an air inlet duct and an air outlet duct respectively embedded in both sides of the outer shell; a sealing cover plate, which is detachably mounted on the outer shell, and three wiring terminals are mounted on the sealing cover plate, a thermostat electrically connected to the three wiring terminals is mounted on the sealing cover plate, and a movable electrical connection piece that can cut off the electrical connection between the three wiring terminals and an external power supply is mounted on the sealing cover plate; a ceramic block, which is fixedly mounted on the bottom end of the sealing cover plate, and a first heating element is symmetrically mounted on both sides of the ceramic block, and a second heating element is embedded in the middle of the ceramic block, and the first heating element and the second heating element are electrically connected to the thermostat; a protective component, which is mounted on the bottom end boss of the sealing cover plate and is located directly above the first heating element and the second heating element. The vehicle air conditioner heating block provided by the present invention has the advantage of safer and more efficient temperature control.

Description

Technical Field

[0001] The invention relates to the technical field of vehicle air conditioners, and in particular to a vehicle air conditioner heating block. Background Art

[0002] In some electric or hybrid vehicles, since the engine is not always running, the heating system may use electric heating elements to generate heat. These electric heating elements are usually PTC ceramic heaters or heating wires, etc. They generate heat by consuming electrical energy and transfer the heat to the air passing through them.

[0003] When the existing vehicle air-conditioning heating block is in use, when a single PTC heating block is in operation, if the temperature of the heating block is controlled to a set temperature, when hot air is blown through a longer air duct, the heat will be dissipated and the temperature of the heating block needs to be controlled within a higher temperature range. If the temperature control efficiency is too fast, the heating block may overheat, leading to safety hazards such as fire. This risk is particularly prominent in vehicle air-conditioning systems that use electric heating elements.

[0004] Therefore, it is necessary to provide a new vehicle air conditioning heating block to solve the above technical problems. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a vehicle air-conditioning heating block with safer and more efficient temperature control.

[0006] The vehicle air-conditioning heating block provided by the present invention comprises: an outer shell, and an air inlet pipe and an air outlet pipe respectively embedded on both sides of the outer shell;

[0007] A sealing cover plate is detachably mounted on the outer shell, and three wiring terminals are mounted on the sealing cover plate, a thermostat electrically connected to the three wiring terminals is mounted on the sealing cover plate, and a movable electrical connection piece capable of cutting off the electrical connection between the three wiring terminals and an external power supply is mounted on the sealing cover plate;

[0008] A ceramic block is fixedly mounted on the bottom end of the sealing cover plate, and first heating elements are symmetrically mounted on both sides of the ceramic block, and a second heating element is embedded in the middle of the ceramic block, and the first heating element and the second heating element are electrically connected to the temperature controller;

[0009] A protection component is installed on the bottom end boss of the sealing cover plate and is located directly above the first heating element and the second heating element. The protection component includes a protection shell, which is installed on the bottom end of the sealing cover plate. Cold connecting rods are installed at the four inner corners of the protection shell. A sealing block for sealing the bottom end of the protection shell is fixedly installed at the bottom end of the cold connecting rod. The sealing block and the protection shell are filled with fine sand.

[0010] Preferably, the movable power connection part includes a connecting plate, which is installed on the sealing cover plate, and a power connection block electrically connected to three wiring terminals is installed on the connecting plate, a through hole is opened in the middle of the power connection block, a power connection convex plate is provided in the through hole, and the connecting plate is provided with a bracket on one side of the power connection block, an insulating rod is rotatably installed on the bracket, a transmission gear is fixedly sleeved on the top end of the insulating rod, a jumper plate electrically connected to the power connection convex plate is fixedly installed on the bottom end of the insulating rod, an intelligent connection part for driving the insulating rod to rotate is installed on the bracket, and the jumper plate and the intelligent connection part are electrically connected to the temperature controller.

[0011] Preferably, the smart connection part includes a support frame, with sleeve one and sleeve two respectively installed at two ends of the support frame, a rack plate is slidably installed on the middle part of the support frame, the rack plate is meshed with the transmission gear, and a sliding rod is fixedly installed on one end of the rack plate facing sleeve one, the sliding rod is slidably inserted in sleeve one, and a return spring is sleeved on the sliding rod, one end of the return spring is fixedly connected to the rack plate, and the other end of the return spring is fixedly connected to sleeve one, and a thermistor magnet is installed on the other end of the rack plate, the thermistor magnet slides with sleeve two, a thermal switch is fixedly installed on one end of the sleeve two, the thermal switch is electrically connected to the temperature controller, and the thermal switch is electrically connected to an electromagnet, the electromagnet is inserted in sleeve two, and magnetically repels the thermistor magnet.

[0012] Preferably, the first heating element comprises a PTC heating plate, the PTC heating plate is mounted on the ceramic block and electrically connected to the temperature controller, and a radiator is mounted on the PTC heating plate.

[0013] Preferably, the second heating element comprises a ventilation pipe, the ventilation pipe is embedded in the middle hole opened in the ceramic block, a metal pipe is installed in the ventilation pipe, an electromagnetic coil is wound around the metal pipe, and the electromagnetic coil is electrically connected to the temperature controller.

[0014] Preferably, the cold link comprises an electric telescopic rod, which is fixedly mounted on a protective shell, and a nut buckle is fixedly mounted on the telescopic end of the electric telescopic rod, a copper tube is threadedly mounted on the nut buckle, a limiting sleeve is threadedly mounted on the end of the copper tube away from the nut buckle, a connecting rod is slidably mounted in the limiting sleeve, a sealing plate is fixedly mounted on the bottom end of the connecting rod, the nut buckle and the connecting rod are connected by a thermal fuse, and the electric telescopic rod is electrically connected to the temperature controller.

[0015] Preferably, a hot air hole is provided on the copper tube.

[0016] Preferably, the blocking block is snap-fitted to the bottom end of the protective shell, and the blocking block is provided with a sand guiding slope.

[0017] Preferably, a heat exchange duct is embedded in the outer shell.

[0018] Compared with the related art, the vehicle air conditioning heating block provided by the present invention has the following beneficial effects:

[0019] The present invention provides a vehicle air-conditioning heating block, which is provided with a protective component on a sealing cover plate, and the protective component cooperates with a protective shell, a cold connecting rod, an electric telescopic rod, a nut buckle, a copper tube, a limit sleeve, a connecting rod, a sealing baffle, a thermal fuse, a blocking block, a sand guide groove, fine sand and a hot air hole to facilitate thermal control management of the heating block, and provide safety protection when temperature control fails to prevent overheating and fire;

[0020] By arranging a movable power connection part on the sealing cover plate, the movable power connection part can automatically cut off the power when the temperature is too high, and automatically connect the power for heating when the temperature is low by using the cooperation of the connecting plate, the power connection block, the power connection convex plate, the bracket, the insulating rod, the transmission gear, the bridge board, the intelligent connection part, the support frame, the sleeve one, the sleeve two, the rack plate, the sliding rod, the reset spring, the thermistor magnet, the thermistor switch and the electromagnet. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A structural schematic diagram of a preferred embodiment of a vehicle air-conditioning heating block provided by the present invention;

[0022] Figure 2 A schematic structural diagram of a vehicle air-conditioning heating block provided by the present invention from another perspective;

[0023] Figure 3 A schematic diagram of the internal structure of the vehicle air-conditioning heating block provided by the present invention;

[0024] Figure 4 A schematic diagram of a structure in which a ceramic block is installed on a sealing cover plate provided by the present invention;

[0025] Figure 5 A schematic diagram of a structure in which a first heating block and a second heating block are installed on a sealing cover plate provided by the present invention;

[0026] Figure 6 A structural schematic diagram of another perspective of a first heating block and a second heating block installed on a sealing cover plate provided by the present invention;

[0027] Figure 7 A schematic diagram of the structure of the movable power connection member provided by the present invention;

[0028] Figure 8 A schematic diagram of the structure of the smart connector provided by the present invention;

[0029] Fig. 9 A schematic diagram of the structure of the protection component provided by the present invention;

[0030] Fig.10 A schematic diagram of the internal structure of the protection component provided by the present invention;

[0031] Fig.11 This is a schematic structural diagram of the cold connecting rod provided by the present invention.

[0032] Numbers in the figure: 1. outer shell; 11. air inlet pipe; 12. air outlet pipe; 2. sealing cover plate; 21. terminal block; 3. thermostat; 4. movable power connection piece; 41. connecting plate; 42. power connection block; 421. power connection convex plate; 43. bracket; 44. insulating rod; 441. transmission gear; 442. bridge board; 45. intelligent connection piece; 451. support frame; 452. sleeve one; 453. sleeve two; 454. rack plate; 455. slide bar; 456. reset spring; 457. thermal magnet; 458. thermal switch; 459. electromagnet ; 5. Ceramic block; 501. Middle hole; 6. First heating element; 61. PTC heating plate; 62. Radiator; 7. Second heating element; 71. Ventilation pipe; 72. Metal pipe; 73. Electromagnetic coil; 8. Protection assembly; 81. Protection shell; 82. Cold connecting rod; 821. Electric telescopic rod; 822. Nut buckle; 823. Copper pipe; 824. Limit sleeve; 825. Connecting rod; 826. Sealing plate; 827. Thermal fuse; 83. Sealing block; 831. Sand guide slope; 84. Fine sand; 801. Hot air hole; 9. Heat exchange air duct. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0034] The specific implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0035] See also Figures 1 to 11 , an embodiment of the present invention provides a vehicle air conditioning heating block, the vehicle air conditioning heating block comprising:

[0036] An outer shell 1, and an air inlet pipe 11 and an air outlet pipe 12 respectively embedded on two sides of the outer shell 1;

[0037] A sealing cover plate 2 is detachably mounted on the outer shell 1, and three wiring terminals 21 are mounted on the sealing cover plate 2, a thermostat 3 electrically connected to the three wiring terminals 21 is mounted on the sealing cover plate 2, and a movable power connection piece 4 that can cut off the electrical connection between the three wiring terminals 21 and an external power supply is mounted on the sealing cover plate 2;

[0038] A ceramic block 5 is fixedly mounted on the bottom end of the sealing cover plate 2, and first heating elements 6 are symmetrically mounted on both sides of the ceramic block 5, and a second heating element 7 is embedded in the middle of the ceramic block 5, and the first heating element 6 and the second heating element 7 are electrically connected to the temperature controller 3;

[0039] The protection component 8 is installed on the bottom end boss of the sealing cover plate 2 and is located directly above the first heating element 6 and the second heating element 7. The protection component 8 includes a protection shell 81, which is installed on the bottom end of the sealing cover plate 2. Cold connecting rods 82 are installed at the four inner corners of the protection shell 81. A blocking block 83 for sealing the bottom end of the protection shell 81 is fixedly installed at the bottom end of the cold connecting rod 82. The blocking block 83 and the protection shell 81 are filled with fine sand 84.

[0040] The cold link 82 includes an electric telescopic rod 821, which is fixedly mounted on the protective shell 81, and a nut buckle 822 is fixedly mounted on the telescopic end of the electric telescopic rod 821, a copper tube 823 is threadedly mounted on the nut buckle 822, and a limiting sleeve 824 is threadedly mounted on one end of the copper tube 823 away from the nut buckle 822, a connecting rod 825 is slidably mounted in the limiting sleeve 824, a sealing plate 826 is fixedly mounted on the bottom end of the connecting rod 825, the nut buckle 822 and the connecting rod 825 are connected by a thermal fuse 827, the electric telescopic rod 821 is electrically connected to the thermostat 3, and a hot air hole 801 is opened on the copper tube 823;

[0041] The blocking block 83 is clamped with the bottom end of the protective shell 81 , and the blocking block 83 is provided with a sand guide groove 831 .

[0042] It should be noted that: when in use, the outer shell 1 is installed in the reserved position of the vehicle air conditioner, and then the air inlet pipe 11 is connected to the air duct of the air conditioner, the air outlet pipe 12 is connected to the air supply pipe of the vehicle air conditioner, the movable electrical connection part 4 is connected to the vehicle power supply, and then the thermostat 3 is used to control the first heating element 6 and the second heating element 7 to heat to a set predetermined temperature, and then the protection component 8 is used to provide protection for the heating block during heating. When the heating block is overloaded, the thermostat 3 controls the electric telescopic rod 821 to extend, thereby releasing the blocking block 83 from the cells in the protective shell 81. The fine sand 84 is used to block and extinguish the fire of the first heating element 6 and the second heating element 7. When the thermostat 3 is out of control and the electric telescopic rod 821 cannot be started normally, the thermal fuse 827 is automatically melted under the continuous high temperature, so that the connecting rod 825 slides along the copper tube 823, so that the blocking plate 826 drives the blocking block 83 to move downward synchronously, thereby releasing the fine sand 84 in the protective shell 81, and using the sand guide groove 831 to guide and pour it in the direction of the first heating element 6 and the second heating element 7 in the heating block to extinguish the fire.

[0043] In the embodiments of the present invention, please refer to Figure 1 , Figure 2 , Figure 3 , Figure 7 and Figure 8 The movable power connection member 4 includes a connecting plate 41, which is installed on the sealing cover plate 2, and a power connection block 42 electrically connected to three wiring terminals 21 is installed on the connecting plate 41, a through hole is opened in the middle of the power connection block 42, and a power connection convex plate 421 is arranged in the through hole, and a bracket 43 is arranged on one side of the connecting plate 41 located at the power connection block 42, and an insulating rod 44 is rotatably installed on the bracket 43, and a transmission gear 441 is fixedly sleeved on the top of the insulating rod 44, and a bridge plate 442 electrically connected to the power connection convex plate 421 is fixedly installed on the bottom end of the insulating rod 44, and a smart connection member 45 for driving the insulating rod 44 to rotate is installed on the bracket 43, and the bridge plate 442 and the smart connection member 45 are electrically connected to the thermostat 3;

[0044] The smart link 45 includes a support frame 451, and sleeves 1 452 and sleeves 2 453 are installed at both ends of the support frame 451 respectively. A rack plate 454 is slidably installed in the middle of the support frame 451, and the rack plate 454 is meshed with the transmission gear 441. A slide bar 455 is fixedly installed on one end of the rack plate 454 facing the sleeve 1 452. The slide bar 455 is slidably inserted in the sleeve 1 452, and a reset spring 456 is sleeved on the slide bar 455. One end of the reset spring 456 is connected to the transmission gear 441. The rack plate 454 is fixedly connected, and the other end of the reset spring 456 is fixedly connected to the sleeve 1 452. The other end of the rack plate 454 is equipped with a thermistor magnet 457, and the thermistor magnet 457 is slidably matched with the sleeve 2 453. A thermal switch 458 is fixedly installed at one end of the sleeve 2 453. The thermal switch 458 is electrically connected to the temperature controller 3, and the thermal switch 458 is electrically connected to an electromagnet 459. The electromagnet 459 is inserted in the sleeve 2 453 and magnetically repels the thermistor magnet 457.

[0045] It should be noted that: when the movable power connection member 4 is in use, the thermal switch 458 is powered on, when the temperature is lower than the set temperature value, it controls the electromagnet 459 to be energized, thereby using magnetic repulsion to push the thermal magnet 457 to drive the rack plate 454 to slide, and the rack plate 454 is meshed with the transmission gear 441, thereby driving the insulating rod 44 to rotate until the contact plate 442 is electrically connected to the power connection convex plate 421 of the power connection block 42, thereby electrically connecting to the terminal 21. When the temperature is too high, the thermal switch 458 controls the electromagnet 459 to be powered on, thereby driving the rack plate 454 to slide, and the rack plate 454 is meshed with the transmission gear 441, thereby driving the insulating rod 44 to rotate, until the contact plate 442 is electrically connected to the power connection convex plate 421 of the power connection block 42, thereby electrically connecting to the terminal 21. The electromagnet 459 is powered off, and the rack plate 454 is pushed to move in the opposite direction under the push of the reset spring 456 until the thermistor magnet 457 contacts the electromagnet 459 to limit the position. At this time, the jumper plate 442 is disconnected from the power-connecting convex plate 421. Further, when the temperature exceeds the limit temperature of the thermal switch 458 and the electromagnet 459 is still powered on, the thermistor magnet 457 will be demagnetized due to being exposed to high temperature for a long time. Therefore, under the push of the reset spring 456, the power can still be cut off, making the high-temperature protection of the heating block safer and more reliable.

[0046] In the present embodiment, the thermistor magnet 457 loses its magnetism when the temperature is higher than the predetermined temperature of the heating block, and gradually recovers its magnetism after cooling down, so as to maintain normal magnetic repulsion in the future.

[0047] In the embodiments of the present invention, please refer to Figure 1 , Figure 4 and Figure 5 , the first heating element 6 includes a PTC heating plate 61, the PTC heating plate 61 is mounted on the ceramic block 5 and is electrically connected to the thermostat 3, and a heat sink 62 is sleeved on the PTC heating plate 61;

[0048] The second heating element 7 includes a ventilation pipe 71 , which is embedded in the middle hole 501 opened in the ceramic block 5 . A metal pipe 72 is installed in the ventilation pipe 71 , and an electromagnetic coil 73 is wound around the metal pipe 72 . The electromagnetic coil 73 is electrically connected to the temperature controller 3 .

[0049] It should be noted that the first heating element 6 uses the traditional PTC heating principle to achieve electric heating, and assists the metal tube 72 and the electromagnetic coil 73 of the second heating element 7 to achieve electromagnetic high-efficiency heating. The two heating methods run synchronously to improve the heating response speed of the heating block.

[0050] In the embodiments of the present invention, please refer to Figure 1 , Figure 2 and Figure 3 , the outer shell 1 is embedded with a heat exchange air duct 9;

[0051] It should be noted that when in use, the heat exchange air duct 9 is connected to the heat exhaust system of the automobile engine, and the residual heat of the engine is used to exchange heat with the heating block, thereby delivering hot air to the vehicle, and the residual heat of the engine can be fully utilized.

[0052] The working principle of the vehicle air conditioning heating block provided by the present invention is as follows:

[0053] When in use, the outer shell 1 is installed in the reserved position of the vehicle air conditioner, and then the air inlet pipe 11 is connected to the air duct of the air conditioner, and the air outlet pipe 12 is connected to the air supply pipe of the vehicle air conditioner, and the movable electrical connection part 4 is connected to the vehicle power supply, and then the thermostat 3 is used to control the first heating element 6 and the second heating element 7 to heat to a set predetermined temperature, and then the protection component 8 is used to provide protection for the heating block during heating. When the heating block is overloaded, the thermostat 3 controls the electric telescopic rod 821 to extend, thereby releasing the sealing block 83 from sealing the fine sand 84 in the protective shell 81. The first heating element 6 and the second heating element 7 are extinguished by using the fine sand 84. When the thermostat 3 is out of control and the electric telescopic rod 821 cannot be started normally, the thermal fuse 827 is automatically melted under the continuous high temperature, so that the connecting rod 825 slides along the copper tube 823, and the sealing plate 826 drives the blocking block 83 to move downward synchronously, thereby releasing the fine sand 84 in the protective shell 81, and using the sand guide groove 831 to guide and pour the sand toward the first heating element 6 and the second heating element 7 in the heating block to extinguish the fire;

[0054] Furthermore, when the movable power connection member 4 is in use, when the thermal switch 458 is connected to the power, when the temperature is lower than the set temperature value, the control electromagnet 459 is energized, thereby using the magnetic repulsion to push the thermal magnet 457 to drive the rack plate 454 to slide, and the rack plate 454 is meshed with the transmission gear 441, thereby driving the insulating rod 44 to rotate until the contact plate 442 is electrically connected to the power connection convex plate 421 of the power connection block 42, thereby electrically connecting to the terminal 21. When the temperature is too high, the thermal switch 458 controls the power connection. The magnet 459 is powered off, and the rack plate 454 is pushed in the opposite direction by the reset spring 456 until the thermistor magnet 457 contacts the electromagnet 459 to reach a limit. At this time, the jumper plate 442 is disconnected from the power-connecting convex plate 421. Further, when the temperature exceeds the limit temperature of the thermal switch 458 and the electromagnet 459 is still powered on, the thermistor magnet 457 will be demagnetized due to being in high temperature for a long time. Therefore, the power can still be cut off under the push of the reset spring 456, making the high-temperature protection of the heating block safer and more reliable.

[0055] The circuits and controls involved in the present invention are all prior art and will not be described in detail here.

[0056] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A vehicle air conditioning heating block, comprising: An outer shell (1), and an air inlet pipe (11) and an air outlet pipe (12) respectively embedded on two sides of the outer shell (1); It is characterized by further comprising: A sealing cover plate (2) is detachably mounted on the outer shell (1), and three wiring terminals (21) are mounted on the sealing cover plate (2), a temperature controller (3) electrically connected to the three wiring terminals (21) is mounted on the sealing cover plate (2), and a movable power connection member (4) capable of cutting off the electrical connection between the three wiring terminals (21) and an external power source is mounted on the sealing cover plate (2), the movable power connection member (4) comprising a connecting plate (41), the connecting plate (41) being mounted on the sealing cover plate (2), and power connection blocks (42) electrically connected to the three wiring terminals (21) are mounted on the connecting plate (41). ), a through hole is opened in the middle of the power connection block (42), a power connection convex plate (421) is arranged in the through hole, a bracket (43) is arranged on one side of the connection plate (41) located on the power connection block (42), an insulating rod (44) is rotatably mounted on the bracket (43), a transmission gear (441) is fixedly sleeved on the top end of the insulating rod (44), a connecting plate (442) electrically connected to the power connection convex plate (421) is fixedly mounted on the bottom end of the insulating rod (44), an intelligent connection component (45) for driving the insulating rod (44) to rotate is installed on the bracket (43), and the connecting plate (442) and the intelligent connection component (45) are connected to the temperature control The device (3) is electrically connected, the intelligent connection part (45) comprises a support frame (451), sleeve 1 (452) and sleeve 2 (453) are respectively installed at two ends of the support frame (451), a rack plate (454) is slidably installed in the middle of the support frame (451), the rack plate (454) is meshed with the transmission gear (441), a sliding rod (455) is fixedly installed on one end of the rack plate (454) facing the sleeve 1 (452), the sliding rod (455) is slidably inserted in the sleeve 1 (452), and a return spring (456) is sleeved on the sliding rod (455), and the return spring (456) One end of the rack plate (454) is fixedly connected to the rack plate (454), the other end of the return spring (456) is fixedly connected to the sleeve one (452), the other end of the rack plate (454) is installed with a thermistor magnet (457), the thermistor magnet (457) is slidably matched with the sleeve two (453), one end of the sleeve two (453) is fixedly installed with a thermistor switch (458), the thermistor switch (458) is electrically connected to the temperature controller (3), and the thermistor switch (458) is electrically connected to an electromagnet (459), the electromagnet (459) is inserted into the sleeve two (453), and magnetically repels the thermistor magnet (457); A ceramic block (5) is fixedly mounted on the bottom end of the sealing cover plate (2), and first heating elements (6) are symmetrically mounted on both sides of the ceramic block (5), and a second heating element (7) is embedded in the middle of the ceramic block (5), and the first heating element (6) and the second heating element (7) are electrically connected to the temperature controller (3); A protection component (8) is mounted on a boss at the bottom end of the sealing cover plate (2) and is located directly above the first heating element (6) and the second heating element (7). The protection component (8) comprises a protection shell (81). The protection shell (81) is mounted on the bottom end of the sealing cover plate (2). Cold connecting rods (82) are mounted on the four inner corners of the protection shell (81). A blocking block (83) for blocking the bottom end of the protection shell (81) is fixedly mounted on the bottom end of the cold connecting rod (82). The blocking block (83) and the protection shell (81) are filled with fine sand (84). The cold connecting rod (82) comprises an electric telescopic rod (821). The electric telescopic rod (821) is fixedly installed on the protective shell (81), and a nut buckle (822) is fixedly installed on the telescopic end of the electric telescopic rod (821), a copper tube (823) is threadedly installed on the nut buckle (822), and a limiting sleeve (824) is threadedly installed on one end of the copper tube (823) away from the nut buckle (822), a connecting rod (825) is slidably installed in the limiting sleeve (824), and a sealing plate (826) is fixedly installed on the bottom end of the connecting rod (825), the nut buckle (822) and the connecting rod (825) are connected by a thermal fuse (827), and the electric telescopic rod (821) is electrically connected to the temperature controller (3).

2. The vehicle air conditioning heating block according to claim 1, characterized in that: The first heating element (6) comprises a PTC heating plate (61), the PTC heating plate (61) being mounted on the ceramic block (5) and electrically connected to the temperature controller (3), and a heat sink (62) being sleeved on the PTC heating plate (61).

3. The vehicle air conditioning heating block according to claim 1, characterized in that: The second heating element (7) comprises a ventilation pipe (71), the ventilation pipe (71) being embedded in a middle hole (501) opened in the ceramic block (5), a metal pipe (72) being installed in the ventilation pipe (71), an electromagnetic coil (73) being wound around the metal pipe (72), and the electromagnetic coil (73) being electrically connected to the temperature controller (3).

4. The vehicle air conditioning heating block according to claim 1, characterized in that: The copper tube (823) is provided with a hot air hole (801).

5. The vehicle air conditioning heating block according to claim 1, characterized in that: The blocking block (83) is clamped with the bottom end of the protective shell (81), and the blocking block (83) is provided with a sand guide slope (831).

6. The vehicle air conditioning heating block according to claim 1, characterized in that: The outer shell (1) is embedded with a heat exchange air duct (9).

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