CN214564470U - Electric heating heat exchanger - Google Patents

Abstract

The utility model provides an electric heating heat exchanger disposes electrical unit, electric heater and supplies the cavity that the liquid flows through. The electric control unit and the electric heater are both positioned outside the cavity, at least part of the electric heater is embedded in a shell forming the cavity, and the shell can be used for heating liquid flowing through the cavity. The utility model discloses an electrical heating heat exchanger is favorable to promoting electrical heating heat exchanger's water and electricity resolution to improve its security performance.

Description

Electric heating heat exchanger

Technical Field

The utility model relates to a vehicle air conditioner technical field, in particular to electrical heating heat exchanger.

Background

Along with electric automobile's development popularization, because electric automobile's motor calorific capacity is very little, can't satisfy the demand of vehicle air conditioner warm braw, consequently, need increase independent electric heater, adopt the form of electrical heating to promote passenger's warm braw in the car and use experience.

In the existing air conditioning system of an electric vehicle, when a high-power electric heater is adopted, in order to improve the heat exchange efficiency, heat generated by the electric heater is generally transferred to a heat exchanger through which air flow of the air conditioner passes by using heat transfer liquid such as water as a conduction medium, and then the heating and temperature rise of the air flow are realized. Wherein, in the part of electric heater and liquid heat exchange, often directly place electric heater in the cavity that liquid passes through, the water and electricity separation degree is low, and electric heater and its subsidiary circuit take place the possibility of electric leakage great, have the potential safety hazard.

SUMMERY OF THE UTILITY MODEL

In view of this, the present invention is directed to an electric heating heat exchanger to improve the water-electricity separation degree of the electric heating heat exchanger, thereby improving the safety performance thereof.

In order to achieve the above purpose, the technical scheme of the utility model is realized like this:

an electric heating heat exchanger is provided with an electric control unit, an electric heater and a chamber for liquid to flow through; the electric control unit and the electric heater are both positioned outside the chamber, and the electric heater is at least partially embedded in a shell forming the chamber, so that the liquid flowing through the chamber can be heated through the shell.

Furthermore, the electric control unit and the electric heater are respectively arranged above and below the cavity.

Further, the electric control unit comprises an electrode plate electrically connected with the electric heater and an electric control plate connecting the electrode plate with an external power supply.

Furthermore, the electric control board is provided with temperature sensors for detecting the temperatures of the liquid outlet and the liquid inlet of the cavity.

Furthermore, the temperature sensor is a patch type temperature sensor.

Furthermore, an insulated gate bipolar transistor is arranged on the electric control board.

Further, the housing comprises a lower housing and an upper housing which are buckled with each other to form the chamber; the electric control unit is fixedly arranged on the upper part of the upper shell, and the electric heater is embedded in the lower shell from the lower part of the lower shell.

Furthermore, the electric heater is a plurality of PTC heating elements which are arranged at intervals, and a plurality of embedded grooves for embedding the PTC heating elements are formed in the lower shell; the wall body of each embedded groove is of a thin-wall structure, a plurality of back protrusions which are arranged at intervals are formed on one side of the cavity of the lower shell, and a flow passage for the liquid to flow through is formed between the back protrusions.

Furthermore, a flow blocking plate is arranged between one end of part of the back protrusions and the side wall of the lower shell, and the liquid in the flow channel flows in a circuitous way due to the arrangement of the flow blocking plate.

Furthermore, a circuit board is arranged between the electric control unit and the electric heater, the PTC heating elements are connected to the circuit board, a bottom cover plate is covered on the lower portion of the lower shell, and the electric heater and the circuit board are sealed between the lower shell and the bottom cover plate in an adhesive mode.

Compared with the prior art, the utility model discloses following advantage has:

electric heat exchanger for the liquid flow of conduction heat flows through inclosed cavity, and electric heater and automatically controlled unit thereof all set up in the cavity outside, in electric heater inlays the casing of locating the cavity, the heat conduction that will self produce through the casing gives the liquid in the cavity, thereby realized that electric heat exchanger's water and electricity is kept apart completely, be favorable to the improvement of electric heat exchanger security performance.

In addition, the electric control unit and the electric heater are respectively arranged above and below the cavity, so that a circuit in the electric control unit is far away from the electric heater which applies work by heating, the interference of the high-voltage high-power electric heater on a low-voltage control circuit in the electric control unit is reduced, and the operation stability of the electric heating heat exchanger is favorably improved. The electric control unit is designed into an electric control plate and an electrode plate, so that low-voltage control and circuit output to the electric heater are respectively realized, the overall arrangement of the electric control unit is more reasonable, and the circuit design and the running performance of the electric control unit are favorably improved.

The utility model discloses an electric heating heat exchanger, casing form about its cavity adopts sets firmly the electrical unit in the upper portion of last casing to the accessible adds on last casing and covers the electrical unit protection with the top apron, and electric heater then inlays the lower part of inlaying the dress in casing down, does benefit to arranging respectively of electrical unit and electric heater, and the whole processing structure of the electrical heating heat exchanger of being convenient for. In addition, the arrangement of the embedded groove on the lower shell can facilitate the embedded insertion of each PTC heating element of the electric heater, the thin-wall structure of the embedded groove and the formation of the back bulge on one side of the cavity of the lower shell can realize the guiding flow of liquid in the cavity, and the heat conduction performance of the lower shell and the heat exchange efficiency of the cavity are favorably improved.

Drawings

The accompanying drawings, which form a part of the present disclosure, are provided to provide a further understanding of the present disclosure, and the exemplary embodiments and descriptions thereof are provided to explain the present disclosure, wherein the related terms in the front, back, up, down, and the like are only used to represent relative positional relationships, and do not constitute an undue limitation of the present disclosure. In the drawings:

fig. 1 is an exploded view of the overall structure of an electric heating heat exchanger according to an embodiment of the present invention;

fig. 2 is a schematic view of a disassembled structure of the electric heater, the lower housing and the upper housing according to the embodiment of the present invention;

fig. 3 is a top view of the lower housing according to an embodiment of the present invention;

fig. 4 is a bottom view of the lower housing according to the embodiment of the present invention;

fig. 5 is a schematic view of an assembly structure of the electronic control unit and the circuit board according to an embodiment of the present invention;

fig. 6 is a top view of a top cover plate according to an embodiment of the present invention;

fig. 7 is a top view of the upper housing according to an embodiment of the present invention;

description of reference numerals:

1. a lower housing; 10. a chamber; 100. sealing the rubber ring; 101. a liquid outlet; 102. a liquid inlet; 103. drawing-in plates; 104. a seal ring; 105. perforating; 106. a positioning column; 110. embedding a groove; 111. the back is convex; 112. a flow channel; 113. a spoiler;

2. an upper housing; 20. positioning seats; 200. a support pillar; 201. a low-voltage connection hole; 202. high-voltage connecting holes; 203. a ground bolt; 204. a ground base; 205. a compression beam; 206. an output channel; 207. a fastening hole;

3. an electronic control unit; 30. a circuit board; 300. an insulating guard plate; 301. outputting a pin welding position; 302. heating a pin welding position; 31. an electric control board; 310. a low voltage connector; 311. the low-voltage connection socket; 312. a liquid outlet temperature sensor; 313. a liquid inlet temperature sensor; 314. an insulated gate bipolar transistor; 32. an electrode plate; 320. a high voltage connector; 321. a power supply line; 322. an output loop; 323. an output pin;

4. an electric heater; 400. a PTC heating element; 401. a heater pin;

5. a bottom cover plate; 6. a top cover plate; 7. a fastener; 700. mounting holes; 701. a gasket; 561. a claw; 562. a clamping groove.

Detailed Description

It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.

In the description of the present invention, it should be noted that if terms indicating orientation or positional relationship such as "upper", "lower", "inner", "back", etc. appear, they are based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention; the appearances of the terms first, second, etc. in the figures are also for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Furthermore, in the description of the present invention, the terms "mounted," "connected," and "connecting" are to be construed broadly unless expressly limited otherwise. For example, the connection may be a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; either directly or indirectly through intervening media, or through both elements. To those of ordinary skill in the art, the specific meaning of the above terms in the present invention can be understood in combination with the specific situation.

The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

The embodiment relates to an electric heating heat exchanger, is favorable to promoting the water and electricity separation degree among the electric heating heat exchanger to improve its security performance.

The electric heating heat exchanger is provided with an electric control unit, an electric heater and a chamber for liquid to flow through. The electric control unit and the electric heater are both positioned outside the chamber, and the electric heater is at least partially embedded in a shell forming the chamber, so that liquid flowing through the chamber can be heated through the shell.

Based on the above design concept, an exemplary structure of the electric heating heat exchanger of the present embodiment is shown in fig. 1.

The chamber 10 may be formed by an integrally formed housing structure, but in order to facilitate the separate arrangement of the electric control unit 3 and the electric heater 4 and the overall processing structure of the electric heating heat exchanger, in the present embodiment, the upper and lower housings are fastened to form the chamber 10.

Specifically, the housing of the chamber 10 includes a lower housing 1 and an upper housing 2 that are fastened to each other to enclose the chamber 10, the electronic control unit 3 is fixed to the upper portion of the upper housing 2, and the electric heater 4 is embedded in the lower housing 1 from the lower portion of the lower housing 1. Meanwhile, in consideration of the problem of electromagnetic interference between the electronic control unit 3 and the electric heater 4, it is preferable that the electronic control unit 3 and the electric heater 4 are respectively disposed above and below the chamber 10. Based on the split arrangement of the lower shell 1 and the upper shell 2, the electric control unit 3 can be fixedly arranged at the upper part of the upper shell 2, and the electric control unit 3 can be shielded by covering the top cover plate 6 on the upper shell 2; the electric heater 4 is embedded in the lower part of the lower shell 1, a bottom cover plate 5 is additionally arranged on the lower part of the lower shell 1, and the electric heater 4 is sealed in a cavity between the bottom cover plate 5 and the lower shell 1 in the form of colloid encapsulation and the like, so that good sealing protection for the electric heater 4 is formed.

The electric control unit 3 and the electric heater 4 are respectively arranged above and below the cavity 10, so that a circuit in the electric control unit 3 is far away from the electric heater 4 which applies work by heating, the interference of the high-voltage high-power electric heater 4 on a low-voltage control circuit in the electric control unit 3 is reduced, and the operation stability of the electric heating heat exchanger is favorably improved.

The assembly form among the lower shell 1, the upper shell 2, the bottom cover plate 5 and the top cover plate 6 can be flexibly designed; the materials can also be selected according to the requirements of service performance. For example, the lower case 1 and the upper case 2 may be integrally formed of copper, aluminum, or the like having good thermal conductivity, and the bottom cover 5 and the top cover 6 may be injection-molded of plastic.

As shown in fig. 2, 3 and 4, a sealing rubber ring 100 is additionally installed between the lower casing 1 and the upper casing 2 to ensure the sealing performance of the chamber 10. A plurality of mounting holes 700 are formed in the peripheral edges of the lower shell 1 and the upper shell 2, and fasteners 7 such as screws penetrate through or are screwed in the mounting holes 700, so that the fastening assembly between the lower shell 1 and the upper shell 2 is realized. A plurality of clamping claws 561 can be arranged on the periphery of the bottom cover plate 5, clamping grooves 562 are formed in corresponding positions on the lower shell 1, and the bottom cover plate 5 is buckled on the lower shell 1 in a clamping mode; similarly, the upper case 2 and the top cover 6 may be similarly snap-fitted or mounted via the fasteners 7 and the mounting holes 700.

In order to form good positioning in the process of assembling the lower shell 1 and the upper shell 2, two positioning columns 106 can be arranged on one side of the lower shell 1 facing the upper shell 2, two positioning seats 20 are arranged on the upper shell 2 corresponding to the positioning columns 106, and the positioning columns 106 can be inserted into the positioning seats 20; meanwhile, a fastening hole can be arranged in the positioning insertion hole of the positioning seat 20, and the fastening connection between the positioning seat 20 and the positioning column 106 is realized through the fastening piece 7. In order to prevent the leakage of the fastening hole in the positioning seat 20, two gaskets 701 can be respectively arranged at the upper end and the lower end of the fastening hole.

As shown in fig. 2, 3 and 4, the electric heater 4 of the present embodiment includes a plurality of PTC heat-generating elements 400 arranged at intervals, and the lower case 1 is provided with a plurality of insertion grooves 110 into which the respective PTC heat-generating elements 400 are inserted. The PTC heater 400 can adopt PTC ceramic sheets, and is provided with a copper heating body pin 401 for circuit connection and an aluminum pipe frame for shape supporting; the PTC heating element 400 is coated with an insulating film or an insulating paste to prevent electric leakage, and a good heat conductive property between the PTC heating element 400 and the lower case 1 is maintained by filling a heat conductive paste in the insertion groove 110.

Based on the above structure, the wall of each of the fitting grooves 110 is formed in a thin-walled structure, so that a plurality of back protrusions 111 are formed at intervals on the chamber 10 side of the lower case 1, and a flow passage 112 through which a liquid flows is formed between the back protrusions 111. The installation of the embedded groove 110 on the lower case 1 can facilitate the insertion of the PTC heaters 400 of the electric heater 4, and the thin-wall structure of the embedded groove 110 and the formation of the back protrusion 111 on one side of the chamber 10 of the lower case 1 can realize the guiding flow of the liquid in the chamber 10, which is beneficial to improving the heat-conducting performance of the lower case 1 and the heat exchange efficiency of the chamber 10.

In addition, as shown in fig. 3, a baffle plate 113 is disposed between one end of the back projection 111 and the side wall of the lower housing 1, and the liquid entering through the liquid inlet 102 can flow through each flow passage 112 in a circuitous manner and flow out from the liquid outlet 101 by the arrangement of the baffle plate 113. With such a design, a circuitous flow of the liquid in each flow channel 112 in the chamber 10 is formed, which facilitates the sufficient heat exchange between the electric heater 4 and the liquid in the chamber 10.

As shown in fig. 5 in combination with fig. 1, in the present embodiment, the electronic control unit 3 includes an electrode plate 32 electrically connected to the electric heater 4, and an electronic control plate 31 connecting the electrode plate 32 to an external power source. The electric control unit 3 is designed into two parts, namely an electric control plate 31 and an electrode plate 32, so that low-voltage control and circuit output to the electric heater 4 are respectively realized, the overall arrangement of the electric control unit 3 is more reasonable, and the circuit design and the operation performance of the electric control unit 3 are improved.

A low-voltage connecting hole 201 and a high-voltage connecting hole 202 are formed in the side wall of one side of the upper shell 2, the electric control unit 3 is connected with an external power supply and an external low-voltage control circuit through a high-voltage connector 320 and a low-voltage connector 310, and the low-voltage connector 310 and the high-voltage connector 320 are respectively installed on the low-voltage connecting hole 201 and the high-voltage connecting hole 202 through fasteners 7; the low-voltage connector 310 can be plugged into the low-voltage connection socket 311 of the electronic control board 31 through a wire harness, and the high-voltage connector 320 is connected with the electronic control board 31 through a power supply line 321. Meanwhile, a ground receptacle 204 is provided in the side wall of the upper case 2, and a ground bolt 203 for connecting a ground wire is screwed to the ground receptacle 204.

The heating condition of the electric heating heat exchanger can be known in real time, so that a basis is provided for the operation control of the electric heater 4. Temperature sensors for detecting the temperature at the liquid outlet 101 and the liquid inlet 102 of the chamber 10 are disposed on the electric control board 31 to detect the temperature at the liquid outlet 101 and the liquid inlet 102 of the chamber 10. Preferably, the temperature sensor adopts two patch type temperature sensors, namely a liquid outlet temperature sensor 312 and a liquid inlet temperature sensor 313, and is installed corresponding to the positions of the liquid outlet 101 and the liquid inlet 102 to respectively detect the temperature of the liquid at the positions of the liquid outlet 101 and the liquid inlet 102, so that the integrated assembly of the sensor on the electric control board 31 is facilitated, the sensor can be arranged corresponding to the specific positions of the liquid outlet 101 and the liquid inlet 102, and the integral design and the processing and manufacturing of the electric control unit 3 are facilitated.

In addition, an insulated gate bipolar transistor 314 is further disposed on the electronic control board 31. The insulated gate bipolar transistor 314 is adopted on the electric control board 31, so that the advantages of high input impedance and low conduction voltage drop are achieved. An insulated Gate Bipolar transistor (igbt) is a composite fully-controlled voltage-driven power semiconductor device composed of BJT (Bipolar transistor) and MOS (insulated Gate field effect transistor), and thus has the advantages of both high input impedance of the mosfet and low on-state voltage drop of the transistor. In the electric control board 31 of the present embodiment, the upper and lower bridge design of the IGBT can reduce the safety risk caused by the short circuit of the system, optimize the layout and circuit trend of the circuit board, and enhance the electromagnetic compatibility of the electric control board 31.

In this embodiment, four igbt 314 are welded on the electronic control board 31, and in order to prevent the igbt 314 from being loose in connection due to vibration, a compression beam 205 may be additionally disposed on the igbt 314 to compress and fix each igbt 314, and two ends of the compression beam 205 may be fastened to the upper case 2 by fasteners 7.

As shown in fig. 2 and 5 in combination with fig. 6 and 7, the electronic control board 31 and the electrode board 32 may be mounted on the top of the upper housing 2 in a stacked arrangement, a plurality of support posts 200 may be disposed on the top of the upper housing 2, the electronic control board 31 and the electrode board 32 are fastened to the support posts 200 by fasteners 7, and a gap is formed between the surfaces of the upper housing 2 to prevent electric leakage and excessive conduction of heat on the upper housing 2 to the electronic control unit 3.

For the output circuit 322 between the electrode plate 32 and the electric heater 4, a bent structure may be adopted, arranged through one side of the lower case 1 and the upper case 2. A convex penetrating plate 103 is arranged on the side wall of the lower shell 1, a perforation 105 is arranged in the middle of the penetrating plate 103, a downward extending output channel 206 is formed on one side of the upper shell 2, and an output loop 322 penetrates through the output channel 206 and the perforation 105 and enters a cavity between the upper shell 2 and the bottom cover plate 5 to be connected with the electric heater 4. The outer wall of the outlet channel 206 and the mating portion of the feed-through plate 103 may be provided with a sealing ring 104 to form a sealing shield. Several fastening holes 207 may be provided in the output channel 206 to fasten the output circuit 322 with fasteners 7 and to form a fastening between the feedthrough board 103 and the outer wall of the output channel 206.

Further, a circuit board 30 is provided between the electronic control unit 3 and the electric heater 4, and the PTC heaters 400 of the electric heater 4 are connected to the circuit board 30. Specifically, the Circuit Board 30 may be a Printed Circuit Board (PCB) on which an output pin soldering site 301 and a heating pin soldering site 302 are disposed, an output pin 323 at the end of the output Circuit 322 is soldered in the output pin soldering site 301, and a heating body pin 401 of the PTC heating element 400 is soldered in the heating pin soldering site 302. In order to realize stable connection of the circuit, the electric heater 4 and the circuit board 30 are sealed together in the cavity between the lower casing 1 and the bottom cover plate 5.

The output circuit 322 of the electrode plate 32 in the electric control unit 3 is connected to the circuit board 30, and then connected with the electric heater 4 through the circuit board 30, and the electric heater 4 and the circuit board 30 are sealed and covered in the accommodating cavity between the bottom cover plate 5 and the lower shell 1 in the form of colloid encapsulation and the like, so that not only is the circuit arrangement and the connection installation between the electric heater 4 and the electric control unit 3 convenient, but also good sealing protection for the electric heater 4 can be formed. In order to improve the insulation between the circuit board 30 and the bottom cover 5, an insulating cover 300 may be interposed between the circuit board 30 and the bottom cover 5.

In the electric heating heat exchanger described in this embodiment, the liquid for conducting heat flows through the closed chamber 10, the electric heater 4 and the electric control unit 3 thereof are both disposed outside the chamber 10, the electric heater 4 is embedded in the casing of the chamber 10, and the heat generated by the electric heater 4 is conducted to the liquid in the chamber 10 through the casing, so that complete water and electricity isolation of the electric heating heat exchanger is realized, and improvement of the safety performance of the electric heating heat exchanger is facilitated.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. An electric heating heat exchanger is provided with an electric control unit (3), an electric heater (4) and a chamber (10) for liquid to flow through; the method is characterized in that: the electric control unit (3) and the electric heater (4) are both located outside the chamber (10), and the electric heater (4) is at least partially embedded in a housing forming the chamber (10) and can heat the liquid flowing through the chamber (10).

2. The electrically heated heat exchanger of claim 1 wherein: the electric control unit (3) and the electric heater (4) are respectively arranged above and below the chamber (10).

3. The electrically heated heat exchanger of claim 1 wherein: the electric control unit (3) comprises an electrode plate (32) electrically connected with the electric heater (4), and an electric control plate (31) connecting the electrode plate (32) with an external power supply.

4. The electrically heated heat exchanger of claim 3 wherein: and temperature sensors for detecting the temperatures of the liquid outlet (101) and the liquid inlet (102) of the cavity are arranged on the electric control board (31).

5. The electrically heated heat exchanger of claim 4 wherein: the temperature sensor is a patch type temperature sensor.

6. The electrically heated heat exchanger of claim 3 wherein: and an insulated gate bipolar transistor (314) is arranged on the electric control board (31).

7. An electrically heated heat exchanger as claimed in any one of claims 1 to 6 wherein: the shell comprises a lower shell (1) and an upper shell (2) which are buckled with each other to form the cavity (10) in a surrounding manner; the electric control unit (3) is fixedly arranged at the upper part of the upper shell (2), and the electric heater (4) is embedded in the lower shell (1) from the lower part of the lower shell (1).

8. The electrically heated heat exchanger of claim 7 wherein: the electric heater (4) is composed of a plurality of PTC heating elements (400) which are arranged at intervals, and a plurality of embedded grooves (110) for embedding the PTC heating elements (400) are formed in the lower shell (1); the wall body of each embedded groove (110) is of a thin-wall structure, a plurality of back protrusions (111) are formed on one side of the chamber (10) of the lower shell (1) at intervals, and a flow passage (112) for the liquid to flow through is formed between the back protrusions (111).

9. The electrically heated heat exchanger of claim 8 wherein: a flow blocking plate (113) is arranged between one end of part of the back projection (111) and the side wall of the lower shell (1), and the liquid in the flow channel (112) flows in a circuitous way due to the arrangement of the flow blocking plate (113).

10. The electrically heated heat exchanger of claim 8 wherein: the electric control unit (3) and a circuit board (30) is arranged between the electric heaters (4), the PTC heating bodies (400) are connected to the circuit board (30), a bottom cover plate (5) is covered on the lower portion of the lower shell (1), and the electric heaters (4) and the circuit board (30) are sealed by glue between the lower shell (1) and the bottom cover plate (5).

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