CN113473654B - PTC air heating heater for electric automobile and assembly method thereof - Google Patents

Abstract

The invention discloses a PTC air heating heater for an electric automobile, which comprises a strip-shaped aluminum pipe and a PTC heating element arranged in the aluminum pipe, wherein radiating fins are fixedly connected to the upper surface and the lower surface of the aluminum pipe, the lower end part of the PTC heating element is tightly matched with grooves of vibration reduction gaskets, a combination body of the PTC heating element and the vibration reduction gaskets is distributed in a fixed frame in parallel, the lower end of the combination body is tightly matched with the grooves of the fixed frame scissors, the PTC air heating heater also comprises a locking gasket and a control frame, the PTC heating element is fixed, a baffle plate groove of the locking gasket is matched and fixed with a baffle plate of the fixed frame, the upper end of the PTC heating element is inserted into a limit end groove of the control frame through a fixing channel of the locking gasket, and the control frame and the fixed frame are provided with mounting holes and are fixed by screws. And a method of assembling the same. The invention has good insulation effect, stable structure, high heating power and high maintainability, and simultaneously, the parallel arrangement of the three PTC heating rods and the optimization design of the radiating fins greatly improve the heating efficiency of the product.

Description

PTC air heating heater for electric automobile and assembly method thereof

Technical Field

The invention relates to the technical field of electric automobile heaters, in particular to a PTC air heating heater for an electric automobile and an assembly method thereof.

Background

Due to global warming and exhaustion of fossil fuels, carbon dioxide emission regulations are causing the automobile industry to shift from conventional internal combustion engine automobiles to environmental protection automobiles such as electric automobiles, which are considered as the best mode for eco-friendly automobiles, electric automobiles are not only more energy efficient than conventional internal combustion engine-driven automobiles, but also they emit little greenhouse gases such as carbon dioxide. However, unlike automobiles with conventional engines, electric automobiles are energy efficient such that the small amount of waste heat generated by their powered engine is insufficient for heating purposes. Therefore, they need additional equipment as their primary heat source. From the extensive research currently done on the main heating devices used to heat electric vehicles, such as heat pumps and combustion heaters, high voltage Positive Temperature Coefficient (PTC) heaters that are capable of achieving the required heating capacity, efficiency and reliability are considered to be the most realistic option. The PTC ceramic heater has the following characteristics: stable heating effect, uniform heat conduction, soft start control, power saving, safety, long service life, self-alarming of the circuit and the like.

Just because PTC has the above characteristics, its application is quite extensive. Besides being applied to electric automobiles, many heaters on the market at present are used as core heating components, such as household air conditioners, warm air blowers, bath heaters and the like.

Automotive ptc heaters have been studied as auxiliary heating devices to increase the efficiency of internal combustion engines and to supplement heat sources by reducing radiant heat, and have become the primary heating devices in electric automobiles, but the heating performance of these ptc heaters is generally low. Moreover, due to the increasing heating capacity requirements of the current ptc heaters and the suitability requirements of the operating voltage and the voltage specification of the battery of the electric vehicle, the conventional ptc heaters have not been able to meet the requirements. Since the distance that a single charge can travel is one of very important parameters of an electric vehicle, it is necessary to develop a PTC wind heater having high power and high energy utilization.

In addition, the conventional heater has a simple structure and a small design size, but is inferior in safety, heating power and maintainability. The service life of the heater can be greatly influenced by extreme road conditions in the running process of the vehicle, the existing bulk small heater is not fixed by a fixed frame and the heating body is not completely packaged and waterproof, so that the service life is greatly reduced.

Disclosure of Invention

The invention aims to: the invention aims to provide the PTC air heating heater for the electric automobile, which has the advantages of being easy to process, convenient to install, easy to maintain, excellent in waterproof performance, vibration resistance and heating performance and the like. And a method of assembling the same.

The technical scheme is as follows: the utility model provides a PTC air heater for electric automobile, including the control frame, the PTC heat-generating body, locking gasket, fixed frame, shock attenuation gasket, fixed frame is in the control frame below rather than being connected, both constitute rectangular frame structure, locking gasket sets up and is connected with fixed frame upper portion at rectangular frame structure inside level, the PTC heat-generating body is equipped with a plurality ofly along its horizontal interval in rectangular frame structure, the upper end of every PTC heat-generating body wears to locate respectively in the locking gasket to its electrode and the bottom intercommunication of control frame, the lower extreme is connected with a shock attenuation gasket respectively, shock attenuation gasket is connected with fixed frame's interior bottom wall respectively in proper order.

Further, the PTC heating element comprises PTC heating pipes and cooling fins, wherein the PTC heating pipes are vertically arranged and sequentially arranged in parallel at intervals, and the cooling fins are vertically and sequentially wrapped on the outer peripheral surface of the whole periphery formed by the PTC heating pipes layer by layer.

Further, the PTC heating tube comprises a strip-shaped aluminum tube, electrode plates, insulating mounting holes, an insulating tube, PTC heating chips and a guide tube, wherein a plurality of clamping grooves are formed in the guide tube at intervals along the length direction of the guide tube, a PTC heating chip is clamped in each clamping groove, one electrode plate is arranged on two opposite side surfaces of the guide tube respectively, the whole of the three parts is inserted into the insulating tube, the insulating tube is integrally arranged in the strip-shaped aluminum tube in a penetrating manner until being contacted with an inner end wall of the insulating tube, extension electrodes of the two electrode plates are exposed, the insulating mounting holes are pressed into one end part of the strip-shaped aluminum tube with the extension electrodes, the electrode plates, the insulating tube, the PTC heating chips and the guide tube are pressed into the strip-shaped aluminum tube, the two extension electrodes are respectively arranged in the insulating mounting holes in a penetrating manner and are communicated with the bottom of the control frame, one end of the strip-shaped aluminum tube with the extension electrodes is connected with the anti-loosening gasket, the other end of the strip-shaped aluminum tube is connected with the shock absorption gasket, and the radiating fin is connected with the outer peripheral surface of the strip-shaped aluminum tube.

Optimally, the number of PTC heating pipes is 3-5.

Further, the fixed frame includes baffle, U type frame, and the bottom of U type frame is U shaped steel, and the baffle is equipped with a plurality ofly in proper order between two perpendicular arms of U type frame, and the one end of baffle inserts in the U shaped steel and is fixed rather than the inner wall, makes to divide into a plurality of compartments between two perpendicular arms of U type frame, is equipped with a PTC heat-generating body in every compartment, and the shock attenuation gasket of every PTC heat-generating body lower extreme is blocked respectively and is located in the U shaped steel, and the upper portion of two perpendicular arms of U type frame is connected with the control frame respectively, and the other end of every baffle is connected with locking gasket respectively.

Further, the anti-loose gasket comprises an anti-loose gasket body, a partition plate groove and fixed channels, wherein the partition plate groove is sequentially arranged on one side face of the anti-loose gasket body at intervals along the length direction of the partition plate groove, one side face of the anti-loose gasket body is divided into a plurality of sections, a plurality of fixed channels are sequentially arranged on each section at intervals, the number of the partition plate grooves is equal to that of the partition plates, each partition plate is sequentially clamped in the corresponding partition plate groove, the number of the fixed channels of each section is equal to that of the PTC heating tubes of each PTC heating element, and the PTC heating tubes are sequentially clamped in the corresponding fixed channels.

Further, the damping gasket comprises a damping gasket body and limiting grooves, a plurality of limiting grooves are formed in one side face of the damping gasket body at intervals along the length direction of the damping gasket body, the number of the limiting grooves is equal to that of the PTC heating pipes of each PTC heating body, and the lower ends of the PTC heating pipes are sequentially clamped in the corresponding limiting grooves.

Further, the control frame comprises a control frame body, electrode access ports, limit end positions and power supply access ports, two power supply access ports are arranged on the outer side face of the control frame body at intervals, a plurality of limit end positions are arranged at the bottom of the control frame body at intervals along the transverse direction of the control frame body, two electrode access ports are arranged at intervals on each limit end position, and electrodes on the PTC heating bodies are sequentially inserted into the corresponding electrode access ports.

Optimally, the number of the PTC heating elements is 4-8.

The assembling method of the PTC air heating heater for the electric automobile comprises the following steps of:

Step one: after a plurality of PTC heating chips are sequentially embedded into a guide pipe, attaching two electrode plates on two opposite side surfaces of the guide pipe, wherein an extending electrode is tightly matched with an electrode groove at one end of the guide pipe, inserting a combination of the PTC heating chips, the guide pipe and the electrode plates into an insulating pipe with one closed end, inserting the insulating pipe into a strip-shaped aluminum pipe with the closed tail end, finally inserting an installation inserting sheet of an insulating installation hole into a gap between the insulating pipe and the guide pipe to compress, and penetrating out an electrode channel of the insulating installation hole to complete the assembly of the PTC heating pipe;

Step two: the method comprises the steps that a plurality of PTC heating pipes are placed in parallel and kept at a certain interval to form a whole, radiating fins are sinusoidal corrugated fins, the radiating fins are vertically and sequentially wrapped on the outer peripheral surface of the plurality of PTC heating pipes layer by layer at equal intervals, the plurality of PTC heating pipes are arranged in each radiating fin in a penetrating mode, the arrangement length of the radiating fins is smaller than that of the PTC heating pipes, the radiating fins and the PTC heating pipes are fixed through brazing, and the PTC heating body is assembled;

Step three: installing damping gaskets at the bottom end of the PTC heating element to form a whole, sequentially arranging a plurality of the whole at intervals in the fixed frame, enabling each damping gasket to be inserted into the bottom of the fixed frame, installing the anti-loosening gaskets at the upper part of the fixed frame, and enabling the top end of each PTC heating element to be respectively penetrated into the anti-loosening gaskets;

Step four: the control frame is placed above the anti-loose gaskets, so that the electrode at the upper end of each PTC heating element is communicated with the bottom of the control frame, then the control frame is connected with the upper part of the fixed frame through bolts, and the whole PTC air heating heater is assembled.

The beneficial effects are that: compared with the prior art, the invention has the advantages that:

1. The PTC air heating heater for the safe and efficient electric automobile has the advantages of good insulation effect, stable structure, high heating efficiency and high maintainability.

2. The invention is mainly composed of a fixed frame, a plurality of groups of PTC heating elements and a control frame. The PTC heating element and the fixed frame are assembled very conveniently, the PTC heating element and the damping gasket assembly are inserted into the groove at the lower part of the fixed frame, the upper end part of the PTC heating element is inserted into the groove at the limiting end of the control frame, the side surfaces of the fixed frame and the control frame are provided with vacancies and are screwed and fixed by screws, the combination of the fixed frame and the control frame is very tight, and the use condition under the strong vibration environment can be met.

3. The PTC heating element and the vibration damping gasket provided by the invention can be tightly inserted into the fixed frame. The PTC heating element mainly adopts mica with good physical and chemical properties as an insulating material, and is more reliable and safer than the common insulating material. The conduit in the PTC heating element has the functions of separation, fixation and heat conduction, so that the heating efficiency of the PTC heating chip is improved. The outlet section of the electrode plate of the PTC heating element is vertically designed, so that the distance between the positive electrode and the negative electrode is increased, and the control frame is convenient to access. Meanwhile, the separation of the control system and the heating system improves the safety and maintainability of the whole system. The heat generating and radiating efficiency is greatly improved by adopting the parallel design of a plurality of PTC heating bodies and using sine corrugated fins as radiating fins, and the heat generating and radiating efficiency is also one of the most remarkable characteristics of the heat generating and radiating device.

4. The fixing frame and the control frame are fixed by virtue of the screw holes on the fixing ends, so that the fixing frame is very convenient to detach, the upper part of the PTC heating element is fixed and enhanced in heat insulation by virtue of the design of the anti-loose gasket, and the PTC heating element can be completely insulated by virtue of the design of the insulation mounting holes on the end parts of the PTC heating element, so that the safety of the device can be ensured. When the dust and dirt of the radiating fins are accumulated, a user can detach the PTC heating element from the fixed frame by himself, and then the PTC heating element is cleaned respectively. If the PTC heating component is severely corroded or damaged, the PTC heating component can be directly replaced without replacing the whole set of device, so that the use cost of a user is greatly reduced.

Drawings

FIG. 1 is a schematic diagram of the structure of the present invention;

FIG. 2 is a side view of the present invention;

FIG. 3 is a front view of the present invention;

FIG. 4 is a bottom view of the present invention;

FIG. 5 is a schematic perspective view of the present invention;

FIG. 6 is a schematic perspective view of a PTC heating element;

Fig. 7 is a schematic structural view of a PTC heating tube;

FIG. 8 is a cross-sectional view A-A of FIG. 7;

FIG. 9 is a cross-sectional view B-B of FIG. 7;

Fig. 10 is an exploded schematic view of a PTC heating tube;

FIG. 11 is a schematic perspective view of a stationary frame;

FIG. 12 is a front view of the control rack;

FIG. 13 is a bottom view of the control mount;

FIG. 14 is a cross-sectional view of C-C of FIG. 12;

FIG. 15 is a schematic perspective view of a vibration damping shim;

FIG. 16 is a schematic perspective view of a looseness-preventing gasket;

FIG. 17 is a schematic perspective view of an insulated mounting hole;

FIG. 18 is a schematic cross-sectional structural view of an insulated mounting hole;

Fig. 19 is a schematic perspective view of an electrode sheet;

fig. 20 is a perspective view of a heat sink.

Detailed Description

The invention will be further elucidated with reference to the drawings and to specific embodiments, it being understood that these embodiments are only intended to illustrate the invention and are not intended to limit the scope thereof.

The PTC air heater for the electric automobile comprises a control frame 1, a PTC heating element 2, a locking gasket 3, a fixed frame 4 and a damping gasket 5 as shown in figures 1-20.

The fixed frame 4 is connected with the control frame 1 below, the fixed frame 4 and the control frame form a rectangular frame structure, the fixed frame 4 comprises a partition plate 4-1 and a U-shaped outer frame 4-2, the control frame 1 comprises a control frame body, an electrode access port 1-1, a limiting end position 1-2 and a power supply access port 1-3, the upper parts of two vertical arms of the U-shaped outer frame 4-2 are respectively connected with the side face of the control frame body through bolts, and mounting positions for being matched with an automobile mounting structure are arranged on the fixed frame 4 and the control frame 1. The bottom of the U-shaped outer frame 4-2 is provided with U-shaped steel, a plurality of partition boards 4-1 are sequentially arranged between two vertical arms of the U-shaped outer frame 4-2 at intervals, the bottom end of each partition board 4-1 is inserted into the U-shaped steel and fixed with the inner wall of the U-shaped steel, the space between the two vertical arms of the U-shaped outer frame 4-2 is divided into a plurality of compartments, each compartment is vertically provided with one PTC heating element 2, and the quantity of the PTC heating elements 2 is 4-8.

Compared with the prior bulk PTC heater, the PTC heating body 2 is intensively fixed by the fixing frame 4, so that the working stability under severe working conditions is greatly improved, and the adjacent PTC heating body 2 is protected by the design of the partition plate 4-1, so that the safety and the stability of the whole device are greatly improved by the fixing frame 4.

The PTC heating body 2 comprises PTC heating pipes 2-1 and cooling fins 2-2, the PTC heating pipes 2-1 are vertically arranged and sequentially arranged in parallel at intervals, the number of the PTC heating pipes 2-1 is 3-5, the PTC heating pipes 2-1-2, electrode plates 2-1-3, insulating mounting holes 2-1-4, insulating pipes 2-1-5, PTC heating chips 2-1-6 and guide pipes 2-1-7, the guide pipes 2-1-7 are provided with a plurality of clamping grooves at intervals along the length direction, each clamping groove is provided with one PTC heating chip 2-1-6 in a clamping way, the PTC heating chips 2-1-6 are 4-10, adjacent PTC heating chips 2-1-6 are separated and fixed by the guide pipes 2-1-7, so that the heating safety is improved, two opposite side surfaces of the guide pipes 2-1-7 are respectively provided with one electrode plate 2-1-3, the whole body is inserted into the insulating pipes 2-1-5, the insulating pipes 2-1-5 are integrally arranged in the strip-2-1 and are provided with two electrode plates 2-1-4 which are arranged at intervals on the two inner end surfaces of the guide pipes 2-1-4, the two electrode plates 2-1-4 are arranged at intervals on the two side surfaces of the two electrode plates 2-1-4 which are arranged at intervals, the two mounting inserting pieces 2-1-4-2 are centrosymmetric, the insulating mounting holes 2-1-4 are pressed into one end part of the strip-shaped aluminum pipe 2-1-2 with the extension electrode 2-1-3-1, the mounting inserting pieces 2-1-4-2 are inserted into the gap between the insulating pipe 2-1-5 and the guide pipe 2-1-7 to be tightly pressed, so that the electrode piece 2-1-3, the insulating pipe 2-1-5, the PTC heating chip 2-1-6 and the guide pipe 2-1-7 are tightly pressed into the strip-shaped aluminum pipe 2-1-2, the insulating pipe 2-1-5 wraps the electrode 2-1-3, not only the waterproof property is enhanced, and the heating element is protected, the safety is improved, the heat conductivity of the insulating tube 2-1-5 is good, the two extending electrodes 2-1-3-1 are respectively penetrated into the two electrode channels 2-1-4-1 of the insulating mounting hole 2-1-4, the radiating fins 2-2 are sequentially wrapped on the outer peripheral surface of the whole periphery formed by the PTC heating tubes 2-1 layer by layer along the vertical direction, and the radiating fins 2-2 are sine corrugated fins, so that the heat exchange area is increased, the fluid disturbance enhanced heat exchange is increased, and the like.

The distribution mode of the plurality of PTC heating tubes 2-1 greatly improves the heating value, and the installation of the radiating fin array enables the heat dissipating capacity to be correspondingly matched, so that the power and the efficiency of one PTC heating element 2 are greatly improved. One end of the strip-shaped aluminum pipe 2-1-2 is closed, the other end is open, the periphery of the pipe wall is rounded, and the material has good insulativity, heat dissipation and corrosion resistance. The good insulation improves the safety of the device, and the rounding treatment is more beneficial to air flow, so that the device has higher heating efficiency. The outlet section of the strip-shaped electrode plate 2-1-3 is vertically designed, the material is aluminum sheet, silver sheet or copper sheet, the vertical design of the outlet section enlarges the distance between the electrode plates and enables the electrode plates to be distributed more orderly, therefore, the vertical design is more beneficial to installation and power supply access, and the electrode plates can be pulled out from the inside of the insulating tube, so that the replacement is convenient. The design of the installation inserting sheet of the insulation installation hole enables the installation of the whole PTC heating body and the replacement of the internal element to be more convenient. The insulating property of the structure is ensured because the insulating property is good, the insulating material has the advantages of water resistance, acid and alkali resistance, weather resistance, higher insulating strength, constant dielectric constant, high thermal stability and the like.

The insulating tube and the insulating mounting hole are made of mica materials, and mica has good insulativity, thermal conductivity, high temperature resistance, certain ductility and workability, and good physical and chemical properties in the temperature abrupt change or acid-base environment, long service life and high reliability. The PTC heating chip is made of ceramic material (BaTiO 3) and has the characteristics of small volume, rapid response to overload current, stable and reliable performance, constant-temperature heating, strong impact resistance, long service life and the like.

The upper end of each baffle plate 4-1 is respectively connected with an anti-loosening gasket 3, the anti-loosening gasket 3 is horizontally arranged in the rectangular frame structure, the anti-loosening gasket 3 comprises an anti-loosening gasket body, baffle grooves 3-1 and fixing channels 3-2, a plurality of baffle grooves 3-1 are sequentially arranged on one side surface of the anti-loosening gasket body at intervals along the length direction of the baffle grooves, one side surface of the anti-loosening gasket body is divided into a plurality of sections, a plurality of fixing channels 3-2 are sequentially arranged on each section at intervals, the number of baffle grooves 3-1 is equal to that of the baffle plates 4-1, each baffle plate 4-1 is sequentially clamped in the corresponding baffle groove 3-1, the number of the fixing channels 3-2 of each section is equal to that of the PTC heating tubes 2-1 of each PTC heating element 2, the PTC heating tube 2-1 is sequentially clamped in a fixed channel 3-2 in a corresponding interval, one end of a strip-shaped aluminum tube 2-1-2 with an extension electrode 2-1-3-1 is penetrated in the fixed channel 3-2, the extension electrode 2-1-3-1 is communicated with the bottom of the control frame 1, two power supply inlets 1-3 are arranged on the outer side surface of the control frame body at intervals, a plurality of limit positions 1-2 are arranged at intervals along the transverse direction of the bottom of the control frame body at intervals, two electrode inlets 1-1 corresponding to the two extension electrodes 2-1-3-1 on the PTC heating tube 2-1 are arranged on each limit position 1-2 at intervals, and the electrodes on the plurality of PTC heating elements 2 are sequentially inserted into the corresponding electrode inlets 1-1.

The control frame 1 is internally provided with a plurality of groups of electronic elements, has the functions of connecting in a power supply, controlling input voltage, fixing a PTC heating body, safely cutting off power supply and the like, and the electric automobile battery power supply wire is connected with the connecting inlet 1-3, so that the control part and the heating part are completely separated, and the safety and maintainability of the whole PTC heating system are improved.

The anti-loose gasket is a carbon plate, and the material has the characteristics of wear resistance, temperature resistance, pressure resistance, corrosion resistance, small expansion coefficient, excellent sealing performance and the like, the high temperature generated by the PTC heating body can be blocked by the anti-loose gasket, the structural strength of the material is high, and the upper part of the PTC heating body is firmly fixed by the anti-loose gasket, so the safety of the whole device is greatly improved.

The lower extreme and the shock attenuation gasket 5 of PTC heat-generating body 2 are connected, and the shock attenuation gasket 5 of every PTC heat-generating body 2 lower extreme is blocked respectively and is located in the U shaped steel, and shock attenuation gasket 5 includes shock attenuation gasket body, limit end groove 5-1, and the spacing a plurality of limit end grooves 5-1 that are equipped with along its length direction on the side of shock attenuation gasket body, limit end groove 5-1's quantity equals with the quantity of the PTC heating tube 2-1 of every PTC heat-generating body 2, and the lower extreme card of PTC heating tube 2-1 is located in the limit end groove 5-1 that corresponds in proper order. The vibration damping pad 5 is made of rubber material and has the characteristics of heat insulation, vibration damping, load bearing and the like, so that the working safety of the PTC heating element is improved.

The invention improves the defects of the prior PTC air heater in the market, and the PTC air heater provided by the invention has the advantages of good insulation effect, stable structure, high heating efficiency and high maintainability.

The assembling method of the PTC air heating heater for the electric automobile comprises the following steps of:

Step one: after a plurality of PTC heating chips 2-1-6 are sequentially embedded into a guide pipe 2-1-7, two electrode plates 2-1-3 are attached to two opposite side surfaces of the guide pipe 2-1-7, wherein an extending electrode 2-1-3-1 is tightly matched with an electrode groove at one end of the guide pipe 2-1-7, a combination of the PTC heating chips 2-1-6, the guide pipe 2-1-7 and the electrode plates 2-1-3 is inserted into an insulating pipe 2-1-5 with one end closed, the insulating pipe 2-1-5 is inserted into an elongated aluminum pipe 2-1-2 with the end closed, finally, an installation inserting piece of an insulating installation hole 2-1-4 is inserted into a gap between the insulating pipe 2-1-5 and the guide pipe 2-1-7 to be tightly pressed, and the extending electrode 2-1-3-1 is penetrated out from an electrode channel of the insulating installation hole 2-1-4, so that the PTC heating pipe 2-1 is assembled;

Step two: the method comprises the steps of arranging a plurality of PTC heating pipes 2-1 in parallel and keeping a certain interval to form a whole, taking radiating fins 2-2 as sine corrugated fins, sequentially wrapping the radiating fins 2-2 on the outer peripheral surface of the plurality of PTC heating pipes 2-1 layer by layer at equal intervals in the vertical direction, penetrating the plurality of PTC heating pipes 2-1 into each radiating fin 2-2, enabling the arrangement length of the radiating fins 2-2 to be smaller than that of the PTC heating pipes 2-1, fixing the radiating fins 2-2 and the PTC heating pipes 2-1 by brazing, and finishing the assembly of the PTC heating body 2;

Step three: installing damping gaskets 5 at the bottom end of a PTC heating tube 2-1 of a PTC heating body 2 to form a whole, sequentially arranging a plurality of the whole at intervals in a fixed frame 4, enabling each damping gasket 5 to be inserted into U-shaped steel at the bottom of the fixed frame 4, installing a locking gasket 3 at the upper part of the fixed frame 4, enabling a baffle plate groove 3-1 to be matched with the upper part of a baffle plate 4-1 of the fixed frame 4, and enabling the top end of each PTC heating body 2 to be respectively penetrated into a fixed channel 3-2 of the locking gasket 3;

Step four: the control frame 1 is placed above the anti-loose gaskets 3, the extension electrode 2-1-3-1 at the upper end of each PTC heating element 2 is communicated with the electrode access opening 1-1 at the bottom of the control frame 1, then the control frame 1 is connected with the upper part of the fixed frame 4 through bolts, and the whole PTC air heating heater is assembled.

Claims (7)

1. The PTC air heating heater for the electric automobile is characterized in that: the anti-loosening device comprises a control frame, PTC heating elements, anti-loosening gaskets, a fixed frame and damping gaskets, wherein the fixed frame is connected with the control frame below the control frame, the control frame and the anti-loosening gaskets form a rectangular frame structure, the anti-loosening gaskets are horizontally arranged in the rectangular frame structure and are connected with the upper part of the fixed frame, the PTC heating elements are arranged in the rectangular frame structure at intervals along the transverse direction of the rectangular frame structure, the upper ends of the PTC heating elements are respectively penetrated in the anti-loosening gaskets until electrodes of the PTC heating elements are communicated with the bottom of the control frame, the lower ends of the PTC heating elements are respectively connected with one damping gasket, and the damping gaskets are respectively connected with the inner bottom wall of the fixed frame in sequence;

The PTC heating body comprises PTC heating pipes and cooling fins, wherein the PTC heating pipes are vertically arranged and sequentially arranged in parallel at intervals, the cooling fins are sequentially wrapped on the outer peripheral surface of the whole body formed by the plurality of PTC heating pipes layer by layer along the vertical direction, and the cooling fins are sine corrugated fins;

The fixing frame comprises a partition board and a U-shaped outer frame, wherein the bottom of the U-shaped outer frame is provided with a plurality of U-shaped steel, the partition board is sequentially arranged between two vertical arms of the U-shaped outer frame at intervals, one end of the partition board is inserted into the U-shaped steel and fixed with the inner wall of the U-shaped steel, the space between the two vertical arms of the U-shaped outer frame is divided into a plurality of compartments, each compartment is provided with a PTC heating element, the shock absorption gasket at the lower end of each PTC heating element is respectively clamped in the U-shaped steel, the upper parts of the two vertical arms of the U-shaped outer frame are respectively connected with the control frame, and the other end of each partition board is respectively connected with the anti-loosening gasket;

The anti-loosening gasket comprises an anti-loosening gasket body, a partition plate groove and fixed channels, wherein the partition plate groove is sequentially arranged on one side face of the anti-loosening gasket body at intervals along the length direction of the partition plate groove, one side face of the anti-loosening gasket body is divided into a plurality of sections, a plurality of fixed channels are sequentially arranged on each section at intervals, the number of the partition plate grooves is equal to that of the partition plates, each partition plate is sequentially clamped in the corresponding partition plate groove, the number of the fixed channels of each section is equal to that of the PTC heating tubes of each PTC heating element, and the PTC heating tubes are sequentially clamped in the corresponding fixed channels.

2. The PTC air heater for an electric vehicle according to claim 1, wherein: the PTC heating tube comprises a strip-shaped aluminum tube, electrode plates, insulating mounting holes, insulating tubes, PTC heating chips and a guide tube, wherein a plurality of clamping grooves are formed in the guide tube at intervals along the length direction of the guide tube, a PTC heating chip is clamped in each clamping groove, one electrode plate is arranged on two opposite side surfaces of the guide tube respectively, the whole of the three parts is inserted into the insulating tubes, the insulating tubes are integrally arranged in the strip-shaped aluminum tube in a penetrating mode until being contacted with an inner end wall of the insulating tubes, the extending electrodes of the two electrode plates are exposed, the insulating mounting holes are pressed into one end portion of the strip-shaped aluminum tube with the extending electrodes, the electrode plates, the insulating tubes, the PTC heating chips and the guide tube are pressed into the strip-shaped aluminum tube, the two extending electrodes are respectively arranged in the insulating mounting holes in a penetrating mode and are communicated with the bottom of the control frame, one end of the strip-shaped aluminum tube with the extending electrodes is connected with the anti-loosening gaskets, the other end of the strip-shaped aluminum tube is connected with the shock-absorbing gaskets, and the radiating sheets are connected with the outer peripheral surface of the strip-shaped aluminum tube.

3. The PTC air heater for an electric vehicle according to claim 1 or 2, wherein: the number of the PTC heating pipes is 3-5.

4. The PTC air heater for an electric vehicle according to claim 1, wherein: the damping gasket comprises a damping gasket body and limiting grooves, a plurality of limiting grooves are formed in one side face of the damping gasket body at intervals along the length direction of the damping gasket body, the number of the limiting grooves is equal to that of the PTC heating pipes of each PTC heating body, and the lower ends of the PTC heating pipes are sequentially clamped in the corresponding limiting grooves.

5. The PTC air heater for an electric vehicle according to claim 1, wherein: the control frame comprises a control frame body, electrode access ports, limit end positions and power supply access ports, wherein two power supply access ports are arranged on the outer side face of the control frame body at intervals, a plurality of limit end positions are arranged at the bottom of the control frame body at intervals along the transverse direction of the control frame body, two electrode access ports are arranged at intervals on each limit end position, and electrodes on the PTC heating bodies are sequentially inserted into the corresponding electrode access ports.

6. The PTC air heater for an electric vehicle according to claim 1, wherein: the number of PTC heating elements is 4-8.

7. A method of assembling the PTC air heater for electric vehicles according to claim 2, comprising the steps of:

Step one: after a plurality of PTC heating chips are sequentially embedded into a guide pipe, attaching two electrode plates on two opposite side surfaces of the guide pipe, wherein an extending electrode is tightly matched with an electrode groove at one end of the guide pipe, inserting a combination of the PTC heating chips, the guide pipe and the electrode plates into an insulating pipe with one closed end, inserting the insulating pipe into a strip-shaped aluminum pipe with the closed tail end, finally inserting an installation inserting sheet of an insulating installation hole into a gap between the insulating pipe and the guide pipe to compress, and penetrating out an electrode channel of the insulating installation hole to complete the assembly of the PTC heating pipe;

Step two: the method comprises the steps that a plurality of PTC heating pipes are placed in parallel and kept at a certain interval to form a whole, radiating fins are sinusoidal corrugated fins, the radiating fins are vertically and sequentially wrapped on the outer peripheral surface of the plurality of PTC heating pipes layer by layer at equal intervals, the plurality of PTC heating pipes are arranged in each radiating fin in a penetrating mode, the arrangement length of the radiating fins is smaller than that of the PTC heating pipes, the radiating fins and the PTC heating pipes are fixed through brazing, and the PTC heating body is assembled;

Step three: installing damping gaskets at the bottom end of the PTC heating element to form a whole, sequentially arranging a plurality of the whole at intervals in the fixed frame, enabling each damping gasket to be inserted into the bottom of the fixed frame, installing the anti-loosening gaskets at the upper part of the fixed frame, and enabling the top end of each PTC heating element to be respectively penetrated into the anti-loosening gaskets;

Step four: the control frame is placed above the anti-loose gaskets, so that the electrode at the upper end of each PTC heating element is communicated with the bottom of the control frame, then the control frame is connected with the upper part of the fixed frame through bolts, and the whole PTC air heating heater is assembled.