CN214384417U

CN214384417U - Electric heating device

Info

Publication number: CN214384417U
Application number: CN202021103717.6U
Authority: CN
Inventors: 不公告发明人
Original assignee: Jiangsu Tnq Engineering Plastics Co ltd
Current assignee: Jiangsu Chaoli Electric Inc
Priority date: 2020-06-15
Filing date: 2020-06-15
Publication date: 2021-10-12
Anticipated expiration: 2030-06-15

Abstract

The invention discloses an electric heating device, which comprises a heating unit and a control chamber (15), wherein the heating unit is divided into a heating chamber (16) and a circulating chamber (17) by a heating seat (9), the heating seat (9) comprises at least one mounting groove (20) of at least one heating bag (7), the mounting groove (20) protrudes into the circulating chamber (17), the circulating chamber (17) comprises an inlet (18) and an outlet (19), liquid flows into the circulating chamber (17) from the inlet (18) and flows out from the outlet (19), the control chamber (15) is arranged right above the heating chamber (16), the control chamber (15) and the heating chamber (16) are of an integrated structure, and the electric heating device has the advantages of leakage prevention, small volume, low manufacturing cost, good durability, flying line reduction, internal interference reduction, connection line optimization and product reliability improvement.

Description

Electric heating device

Technical Field

The invention belongs to the technical field of electric heating.

Background

In the face of increasingly prominent contradiction between fuel supply and demand and environmental pollution, the development of new energy automobile technology is promoted in all countries in the world. The current technology developed more mature is the electric automobile technology and the hydrogen fuel cell automobile technology.

Lithium batteries and hydrogen fuel cells are greatly affected by the environment. The discharge capacity of the lithium battery can be greatly reduced under the low-temperature condition, and the safety performance can be influenced. The fuel cell cannot be started under low temperature conditions of 0 ℃ or lower. Therefore, the two technical routes need to heat the battery under the low-temperature condition, and the normal work of the battery is ensured.

Meanwhile, because an engine is cancelled, the pure electric vehicle cannot generate enough heat to heat the passenger compartment, and therefore a new heat source needs to be introduced to obtain the heat under the low-temperature condition so as to ensure the heating of the passenger compartment.

PTC heating is one of the mainstream heating technologies of the new energy automobile at present, and electric energy is converted into heat energy through the electrification and the heating of PTC ceramics.

CN 210110992U discloses a heating element of a PTC heater, in which a PTC side seat is installed at one side of a heating aluminum tank, and the structure is that a heating unit and a control unit are split, which is easy to cause leakage, large in volume, high in manufacturing cost and poor in durability.

Disclosure of Invention

The invention solves the technical problem of providing an electric heating device which is leak-proof, small in volume, low in manufacturing cost and good in durability.

In order to solve the technical problems, the invention is realized by the following technical scheme: the utility model provides an electric heating device, contains heating element and control room, heating element divide into heating chamber and circulation room with it by the heating seat, the heating seat contains at least one mounting groove of at least one heating package, the mounting groove is outstanding in the circulation room, the circulation room includes import and export, and liquid flows into the circulation room from the import, flows out from the export, the control room is installed directly over the heating chamber, control room and heating chamber structure as an organic whole, this electric heating device with have prevent leaking, small, the gas tightness is good, anti-electromagnetic interference, low in manufacturing cost, the durability is good, reduce the flying wire, reduce internal interference, optimize interconnecting link, improve product reliability.

Preferably, the heating seat is an aluminum seat, and the material is convenient to process and low in cost.

Preferably, the heating pack is a PTC heating pack, the resistivity of the PTC electric heating element is kept constant in a certain temperature range, and when the temperature reaches around the curie temperature of the PTC element, the resistivity thereof is rapidly increased in a narrow temperature range, approaching the advantage of an insulator.

Preferably, the liquid is a mixture of glycol and water, the phenomenon that the liquid is frozen when the ambient temperature is too low is avoided, the electric heating device is damaged, the specific heat capacity of the water is large, and the heating effect is good.

The control chamber comprises an upper cover, an upper insulating silica gel pad, a lower insulating silica gel pad, a high-voltage connector, a low-voltage connector, a control panel and an IGBT transistor, the upper insulating silica gel pad is arranged above the control panel, the upper cover is hermetically connected with the heating seat, the heating chamber further comprises a connecting plate, the connecting plate is electrically connected with the heating bag, the control panel is connected with the connecting plate through a copper bar, the low-voltage connector and the high-voltage connector are respectively connected with the control panel, the lower insulating silica gel pad is arranged above the connecting plate to separate the control chamber from the heating chamber, the circulating chamber further comprises a lower shell, the lower shell is hermetically connected with the heating seat through a sealing ring, the upper insulating silica gel pad prevents the upper cover and the control panel from being poorly insulated, the lower insulating silica gel pad prevents the control panel from being poorly insulated, the sealing connection prevents the control chamber from losing efficacy due to poor air tightness, and prevents the influence of the external environment on the heating chamber from being corroded and the like, the liquid leakage in the circulation chamber is prevented from affecting the normal operation of the heating device.

Preferably, the IGBT transistor is connected to an IGBT heat sink on the heating base.

Preferably, the IGBT transistor is fixed through the IGBT pressing plate, the IGBT transistor is guaranteed to be in full contact with the IGBT radiating seat, and heat dissipation of the IGBT transistor is facilitated.

Preferably, the IGBT pressure plate is made of an insulating and pressure-resistant material.

Preferably, import and export seal installation temperature sensor, temperature sensor transmit the temperature information who gathers for the control room, through control room control heating package operating condition, realize water inlet and delivery port temperature real-time supervision, seal installation can prevent that temperature sensor from droing, realizes practicing thrift the electric energy when effective heating.

Preferably, be equipped with the temperature sensor mounting groove on the heating seat, temperature sensor adorns on the temperature sensor support, and the temperature sensor support mounting plays the fixed action in the mounting groove at the temperature sensor mounting groove temperature sensor support mounting, prevents to drop, and temperature sensor passes the fixed position of temperature sensor support contact integral type aluminium seat mounting groove, promotes temperature sensor and detects the accuracy.

Preferably, the mounting groove and the lower shell form a flow channel which is bent back and forth, so that the thermal efficiency of liquid in the flow channel is enhanced.

Preferably, the control room further comprises a thermal fuse connected in series with the IGBT transistor, the thermal fuse is arranged on the heating base, and after the IGBT transistor is short-circuited, the PTC continuously operates and cannot be turned off, and the water temperature continuously rises; in a hardware circuit, a switch element is additionally designed, when one or more IGBT transistors fail, the switch element can play a role in protection, and in the designed circuit, a thermal fuse is connected in series and has over-temperature protection. When the IGBT transistor breaks down, is not controlled by the control room and is continuously heated, and when the temperature fuse senses abnormal heating and reaches a preset fusing temperature, the temperature sensing body is melted, so that the circuit is disconnected, and double protection is realized.

Drawings

FIG. 1 is an outline view of an electric heating apparatus

FIG. 2 is a view showing an internal structure of an electric heating apparatus

FIG. 3 is a view showing a liquid flow path of the circulation chamber

FIG. 4 is a view showing a structure of a fixing frame of the PTC heating pack

FIG. 5 is a view showing the internal structure of the PTC heating pack

FIG. 6 is a cross-sectional view of a PTC heating pack

FIG. 7 is a partially enlarged view of an IGBT transistor mounting position

FIG. 8 is a view of the mounting groove position

Detailed Description

The invention is further described below with reference to the accompanying drawings.

As shown in fig. 1 and 2, an electric heating device comprises a heating unit and a control chamber 15, wherein the heating unit is divided into a heating chamber 16 and a circulation chamber 17 by a heating seat 9, the heating seat 9 comprises at least one mounting groove 20 of at least one heating pack 7, the mounting groove 20 protrudes into the circulation chamber 17, the circulation chamber 17 comprises an inlet 18 and an outlet 19, liquid flows into the circulation chamber 17 from the inlet 18 and flows out from the outlet 19, the control chamber 15 is arranged right above the heating chamber 16, the control chamber 15 and the heating chamber 16 are of an integrated structure, and the electric heating device has the advantages of leakage prevention, small volume, good air tightness, electromagnetic interference resistance, low manufacturing cost, good durability, flying line reduction, internal interference reduction, optimized connection line and product reliability improvement.

Preferably, the heating seat 9 is an aluminum seat, and the material is convenient to process and low in cost.

Preferably, the heating pack 7 is a PTC heating pack, and the resistivity of the PTC electric heating element is kept constant in a certain temperature range, but when the temperature reaches around the curie temperature of the PTC element, the resistivity thereof is rapidly increased in a narrow temperature range, approaching the advantage of an insulator.

Preferably, the control chamber 15 comprises an upper cover 1, an upper insulating silica gel pad 2, a lower insulating silica gel pad 33, a high-voltage connector 3, a low-voltage connector 4, a control panel 5 and an IGBT transistor, the upper insulating silica gel pad 2 is installed above the control panel 5, the upper cover 1 is hermetically connected with the heating base 9, the heating chamber 16 further comprises a connecting plate 6, the connecting plate 6 is electrically connected with the heating pack 7, the control panel 5 is connected with the connecting plate 6 through a copper bar, the low-voltage connector 4 and the high-voltage connector 3 are respectively connected with the control panel 5, the lower insulating silica gel pad 33 is installed above the connecting plate 6 to separate the control chamber 15 from the heating chamber 16, the circulating chamber 17 further comprises a lower shell 13, the lower shell 13 is hermetically connected with the heating base 9 through a sealing ring 12, the upper insulating silica gel pad 2 prevents the upper cover 1 from being poorly insulated from the control panel 5, and the lower insulating silica gel pad 33 prevents the control panel 5 from being poorly insulated, the sealing connection prevents the control chamber 15 from failing to control elements due to poor air tightness, prevents the external environment from influencing the heating chamber 16 by corrosion and the like, and prevents the liquid in the circulating chamber 17 from leaking to influence the normal operation of the heating device.

Preferably, the IGBT transistor 30 is connected to an IGBT heat sink 29 on the heat sink 9.

Preferably, the IGBT transistor 30 is fixed by the IGBT pressing plate 32, so that the IGBT transistor 30 is ensured to be fully contacted with the IGBT heat dissipation seat 29, which is beneficial to heat dissipation of the IGBT transistor 30.

Preferably, the IGBT pressing plate 32 is made of an insulating and pressure-resistant material.

Preferably, import 18 and 19 seal installation temperature sensor 10 of export, temperature sensor 10 transmits the temperature information who gathers for control room 15, controls heating package 7 operating condition through control room 15, realizes water inlet and delivery port temperature real-time supervision, and seal installation can prevent that temperature sensor 10 from droing, realizes practicing thrift the electric energy when effective heating.

Preferably, be equipped with temperature sensor mounting groove 34 on heating seat 9, temperature sensor 10 adorns on temperature sensor support 11, and temperature sensor support 11 is installed on temperature sensor mounting groove 34, and temperature sensor support 11 is installed and is played the fixed action in mounting groove 34, prevents to drop, and temperature sensor 10 passes the fixed position of temperature sensor support 11 contact mounting groove 34, promotes temperature sensor and detects the accuracy.

As shown in fig. 3, the mounting groove 20 and the lower housing 13 preferably form a flow passage that is bent back and forth, which is advantageous for enhancing the thermal efficiency of the liquid in the flow passage.

Preferably, the control board 5 further comprises a thermal fuse 8 connected in series with the IGBT transistor, the thermal fuse 8 is disposed on the heating base 9, and after the IGBT transistor is short-circuited, the PTC continuously operates and cannot be turned off, and the water temperature continuously rises; in a hardware circuit, a switch element is additionally designed, when one or more IGBT transistors fail, the switch element can play a role in protection, in the designed circuit, a thermal fuse 8 is connected in series, and the thermal fuse 8 has over-temperature protection. When the IGBT transistor breaks down and is not controlled by the control room 15 to continuously heat, and when the temperature fuse senses abnormal heating and reaches a preset fusing temperature, the temperature sensing body melts, so that the circuit is disconnected, and double protection is realized.

An electric heating device transmits heat to liquid through an electrically heated PTC heating bag 7, and applies the heat to a vehicle through heat dissipation, wherein the PTC water heater consists of an upper cover 1, an upper layer insulating silica gel pad 2, a connecting plate 6, the heating bag 7, a thermal fuse 8, a heating seat 9, a sealing ring 12, a lower shell 13, a control panel 5, a high-voltage plug-in 3, a low-voltage plug-in 4 and an IGBT transistor; a heating seat 9 is connected with a lower shell 13 through a sealing ring 12 and a bolt 14 to form a circulating chamber 17 with an inlet 18 and an outlet 19, the heating seat 9 is provided with a heating bag 7 and a thermal fuse 8, the heating bag 7 is provided with a connecting plate 6, the connecting plate 6 is connected with a control panel 5, the working voltage range of the heater is 250V-500V, the lower shell 13 is movably connected with the heating seat 9 through a fixing bolt 14 and can be suitable for different installation requirements, the middle part above the heating seat 9 is provided with a plurality of heating bag installation grooves 20, the number of the heating bags 7 can be adjusted according to requirements, the installation grooves 20 and the lower shell 13 form a flow channel which is bent back and forth, the thermal efficiency of cooling liquid in the flow channel is favorably enhanced, the inlet 18 and the outlet 19 are both provided with water temperature sensors for monitoring the temperature of the reported cooling liquid at a water inlet and a water outlet in real time, the middle part above the heating seat is provided with the thermal fuse 8, the heating bag is provided with PTC sheets, the positive electrode sheet and the negative electrode sheet are respectively connected with the front and the back of the PTC sheet, the electrode sheets are connected with a fixing frame in a riveting mode, a wedge-shaped aluminum insert is arranged on the outer side of the electrode sheets, a heat-conducting silica gel pad and an insulating film are wrapped on the outer side of the wedge-shaped aluminum insert, the communication mode comprises CAN and LIN communication, the heating seat 9 and a lower shell 13 are fixedly buckled by bolts to form a circulating chamber 17, the top of the heating seat 9 is provided with an upper cover 1, a sealing ring 12 is arranged in the joint of the heating seat 9 and the lower shell 13, the sealing ring 12 prevents liquid leakage to cause poor air tightness of the PTC water heater, the heating seat 9 is provided with a plurality of PTC heating bag mounting grooves 20, and the number of the heating bags 7 CAN be adjusted according to requirements, all the heating packs 7 are connected together through a connecting plate 6 to form a heating pack group, heat generated by the PTC heating packs 7 is firstly transmitted to a mounting groove 20 and then transmitted to liquid, a control plate 5 is connected with the connecting plate 6 through a copper bar, a heating seat 9 is provided with a low-voltage connector 4 and a high-voltage connector 3, the low-voltage connector 4 and the high-voltage connector 3 are respectively connected with the control plate 5, a temperature sensor mounting groove 34 is arranged on the heating seat 9, a temperature sensor 10 is arranged on a temperature sensor support 11, the temperature sensor support 11 is arranged on the temperature sensor mounting groove 34, sealant is filled to prevent the water temperature sensor from falling off, the temperature sensor support 11 is arranged in the mounting groove 34 to play a role of fixing and prevent the falling off, the temperature sensor 10 passes through the fixed position of the temperature sensor support 11 contacting the mounting groove 34, the detection accuracy of the temperature sensor is improved, and an upper-layer insulating silica gel pad 2 is arranged above the control plate, the upper insulation silica gel pad 2 prevents that upper cover 1 and control panel 5 are insulating bad, and upper cover 1 is connected through the draw-in groove of buckle and heating seat 9, irritates sealed glue, guarantees the gas tightness.

As shown in fig. 4, 5 and 6, the PTC heating pack comprises a fixing frame 21, a PTC sheet 24 and positive and negative electrode sheets 25, wherein the PTC sheet 24 is installed in the fixing frame 21, and the positive and negative electrode sheets 25 are installed on the front and back surfaces of the PTC sheet 24, and is characterized in that the fixing frame 21 is provided with a circular riveting point 22 and a semicircular riveting point 23, and the positive and negative electrode sheets 25 are connected with the fixing frame 21 by a hot riveting method, so that the production cost is low, and the structural durability is good.

Preferably, a layer of heat-conducting glue is arranged on the inner surfaces of the positive and negative electrode plates 25, and fills the microscopic gap between the positive and negative electrode plates and the PTC sheet, so that the heat-conducting property is improved.

Preferably, wedge-shaped aluminum inserts 26 are symmetrically provided on the outer surfaces of the positive and negative electrode plates 25, and serve to fasten the PTC heater pack when the PTC heater pack is assembled.

Preferably, a heat-conducting silica gel pad 27 is arranged outside the wedge-shaped aluminum insert 26, so that hard contact of the PTC heating bag is reduced, and the heat-conducting property of the PTC heating bag is improved.

Preferably, an insulating film 28 is provided outside the heat conductive silicone gasket 27 to insulate the PTC heater pack.

Preferably, the PTC sheet 24 is four.

Preferably, the material of the fixing frame 21 is a dielectric and pressure resistant plastic material.

Preferably, the dielectric and pressure resistant plastic materials are PPS and GF 30.

Preferably, the fixing frame 21 has a circular riveting point 22 and six semicircular riveting points 23 on both sides.

A PTC heating pack efficiently converts electric energy passing through positive and negative electrode plates 25 into heat energy by means of PTC sheets 24, and applies the heat energy to a PTC water heater for heating coolant and supplying heat energy to the inside of a vehicle by means of wedge-shaped aluminum inserts 26, heat-conductive silicone pads 27 and insulating films 28. The PTC heating bag comprises positive and negative electrode plates 25, a PTC sheet 24 arranged between the positive and negative electrode plates 25, and insulating heat-conducting glue printed on the positive and negative electrode plates 25, wherein the positive and negative electrode plates 25 are connected with a fixing frame 21 in a high-temperature riveting mode, the outer side of the positive and negative electrode plates 25 is provided with a wedge-shaped aluminum insert 26, the outer side of the positive and negative electrode plates is wrapped with a heat-conducting silica gel pad 27 and an insulating film 28, the PTC sheets arranged between the positive and negative electrode plates 25 are provided with four insulating heat-conducting glue printed on the positive and negative electrode plates 25, the insulating function is realized, the high-voltage leakage is prevented, the heat transfer is not influenced, the fixing frame 21 is made of PPS (polyphenylene sulfide) and GF30, the two sides of the fixing frame are respectively provided with a round riveting point 22 and six semicircular riveting points 23, the positive and negative electrode plates 25 are fixed on the fixing frame 21 through high-temperature riveting, the fixing, protecting and insulating functions are realized on internal parts of the PTC heating bag, the wedge-shaped aluminum insert 26 plays a fastening function in the assembly of the PTC heating bag, the heat-conducting silica gel pad 27 reduces the hard contact of the PTC heating bag, the heat conduction efficiency of the PTC heating bag is improved, and the insulation film 28 plays an insulation role in the PTC heating bag.

It should be noted that the present invention is only one specific embodiment, and it is obvious that the described embodiment is only a part of the embodiments of the present invention, not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Claims

1. An electric heating device comprising a heating unit and a control chamber (15), said heating unit being divided by a heating seat (9) into a heating chamber (16) and a circulation chamber (17), said heating seat (9) comprising at least one mounting slot (20) for at least one heating pack (7), said mounting slot (20) protruding into said circulation chamber (17), said circulation chamber (17) comprising an inlet (18) and an outlet (19), liquid flowing into the circulation chamber (17) from the inlet (18) and out of the outlet (19), characterized in that said control chamber (15) is mounted directly above said heating chamber (16), the control chamber (15) and the heating chamber (16) being of unitary construction.

2. An electric heating device as claimed in claim 1, characterized in that the heating seat (9) is an aluminium seat.

3. An electric heating device according to claim 1, characterized in that the heating pack (7) is a PTC heating pack.

4. An electrical heating apparatus as claimed in claim 1, 2 or 3, in which the liquid is a mixture of ethylene glycol and water.

5. An electric heating device according to claim 1, 2 or 3, characterized in that the control chamber (15) comprises an upper cover (1), an upper insulating silica gel pad (2), a lower insulating silica gel pad (33), a high voltage connector (3), a low voltage connector (4), a control board (5) and IGBT transistors, the upper insulating silica gel pad (2) is installed above the control board (5), the upper cover (1) and the heating base (9) are hermetically connected, the heating chamber (16) further comprises a connecting board (6), the connecting board (6) is electrically connected with the heating bag (7), the control board (5) is connected with the connecting board (6) through a copper bar, the low voltage connector (4) and the high voltage connector (3) are respectively connected with the control board (5), the lower insulating silica gel pad (33) is installed above the connecting board (6) to separate the control chamber (15) from the heating chamber (16), the circulation chamber (17) further comprises a lower shell (13), and the lower shell (13) is connected with the heating seat (9) in a sealing mode through a sealing ring (12).

6. An electric heating device according to claim 5, characterized in that the IGBT transistor (30) is connected to an IGBT heat sink (29) on the heating base (9).

7. An electric heating device according to claim 6, characterized in that the IGBT transistors (30) are fixed by means of IGBT pressboards (32).

8. An electric heating device according to claim 7, characterized in that the IGBT pressure plate (32) is made of a dielectric material.

9. An electric heating device according to claim 1, 2 or 3, characterized in that temperature sensors (10) are hermetically mounted at the inlet (18) and the outlet (19), the temperature sensors (10) transmit collected temperature information to the control room (15), and the operating state of the heating bag (7) is controlled by the control room (15).

10. An electric heating apparatus as claimed in claim 9, wherein the heating base (9) is provided with a temperature sensor mounting groove (34), the temperature sensor (10) is mounted on a temperature sensor support (11), and the temperature sensor support (11) is mounted on the temperature sensor mounting groove (34).

11. An electric heating device according to claim 1, 2 or 3, characterized in that the mounting groove (20) forms a flow path with the lower housing (13) which is curved back and forth.

12. An electric heating device according to claim 5, characterized in that the control board (5) further comprises a thermal fuse (8) in series with the IGBT transistors, the thermal fuse (8) being arranged on the heating base (9).