Electric heating tube and automobile water pump using same

Abstract

The utility model discloses an electric heating tube and an automobile water pump with the same, the electric heating tube comprises a resistance wire, a metal tube and a filling medium, the filling medium is centered along the axis of the tube in the metal tube through the resistance wire, and the filling medium is filled between the resistance wire and the inner wall of the metal tube; sealing glue is arranged at a pipe opening of the metal pipe and arranged on the outer wall of the metal pipe and the end of the pipe opening in a sleeved mode, a through hole is formed in the center of the sealing glue, one end of the resistance wire is connected with a metal leading-out rod, at least part of the leading-out rod penetrates out through the through hole, and the outer wall of at least part of the leading-out rod is connected with a columnar metal welding sleeve with a blind hole in a sleeved mode. One end of the welding sleeve faces the end face of the sealing compound, the other end of the welding sleeve is located at the end of the leading-out rod, and the peripheral surface of the end is made of tinning materials so that the leading-out rod can be welded to the circuit board through the welding sleeve. Connection between the electric heating tube and the circuit board is achieved, assembly is simple, the arrangement space of the circuit board is greatly increased, and automobile water pump accessories are more compact and lighter.

Description

Technical Field

[0001] The utility model relates to an electric heating tube for an automotive electric water pump, which can be classified into F04D / 58 and F04D / 42 in IPC classification. Background Art

[0002] In the related art, for the resistive heating tube currently applied in automotive electric water pumps, when the resistance wire lead-out rod is connected to the circuit board, since the material of the resistance wire is mostly nickel-chromium wire or iron-chromium wire, this material is often not easy to be tinned and soldered to the circuit board, and the lead-out rod for butt welding with it is generally a ferrous alloy. Therefore, wire connection or nut tightening methods are usually used for connection. The former wire connection requires adding welding terminals, connection noses, etc., and the latter nut tightening occupies a large space. Therefore, these connection methods greatly reduce the layout space of the circuit board, which is not conducive to the lightweight of automotive parts.

[0003] Common knowledge and terms can be found in "Fundamentals of Electronic Technology" published by Beihang University Press in 2014, "Mechanical Engineering Handbook" and "Electrical Engineering Handbook" published by China Machine Press in 1978 - 1983 or the second edition in 1997, "Pump Theory and Technology" published by China Machine Press in the first edition in 2014, as well as the national standard GB / T 7021 "Centrifugal Pump Nomenclature" and the national mechanical industry standard JB / T 4088.1 - 2022 "Household Tubular Electric Heating Elements Part 1: General Requirements", JB / T 2379 - 2016 "Metal Tubular Electric Heating Elements". Content of the Utility Model

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. For this purpose, the utility model provides an electric heating tube and an automotive water pump having the same, which can solve the problem of excessive space occupation when the resistance wire is connected to the circuit board in the traditional technology.

[0005] In a first aspect, the utility model provides an electric heating tube, comprising: a resistance wire, a metal tube, and a filling medium. The filling medium centers the resistance wire along the tube axis inside the metal tube and is filled between the resistance wire and the inner wall of the metal tube. A sealing glue is provided at the pipe orifice of the metal tube, and the sealing glue sleeves the outer wall of the metal tube and the pipe orifice end. A through hole is provided at the center of the sealing glue. One end of the resistance wire is connected to a metal lead-out rod, at least part of the lead-out rod passes through the through hole, and at least part of the outer wall of the lead-out rod is sleeved with a columnar metal welding sleeve with a blind hole. One end of the welding sleeve faces the end face of the sealing glue, and the other end is located at the end of the lead-out rod, and the outer peripheral surface of this end is a tin-platable material for welding the lead-out rod to the circuit board through the welding sleeve.

[0006] The electric heating tube according to the embodiment of the present utility model has at least the following beneficial effects: By providing a welding sleeve on the lead-out rod of the electric heating tube and welding the welding sleeve to the circuit board, the connection between the electric heating tube and the circuit board is realized. The welding sleeve is small in volume and simple in assembly, greatly increasing the available layout space of the circuit board and having a high manufacturing efficiency.

[0007] According to some embodiments of the present utility model, the socket connection mode between the welding sleeve and the lead-out rod is percussion welding or riveting. Using percussion welding or riveting for connection can make the connection between the tin-plated alloy welding sleeve and the resistance wire more firm and the connection stability stronger.

[0008] According to some embodiments of the present utility model, the socket connection mode between the welding sleeve and the lead-out rod is hot sleeving or cold pressing, and the inner diameter of the welding sleeve is smaller than the diameter of the lead-out rod. The inner diameter of the welding sleeve being smaller than the diameter of the lead-out rod enables the lead-out rod to be tightly held during hot sleeving or cold pressing, making the connection more firm.

[0009] According to some embodiments of the present utility model, the surface of the welding sleeve includes a tin-plated layer, the circuit board includes a welding through-hole, the lead-out rod and the welding sleeve pass through the welding through-hole, the tin-plated layer of the welding sleeve is connected to the welding through-hole by soldering, at least a part of one end of the tin-plated layer extends beyond one end face of the welding through-hole, and at least a part of the other end of the tin-plated layer extends beyond the other end face of the welding through-hole. This can effectively prevent the occurrence of false soldering.

[0010] According to some embodiments of the present utility model, convex points are provided on the side wall of the welding sleeve, a guiding section is left between the convex points and one end of the welding sleeve, the guiding distance of the guiding section is greater than or equal to 1 mm, and the welding sleeve and the lead-out rod are in interference fit or transition fit. The guiding section can make the lead-out rod easier to be introduced into the welding sleeve, making the installation more convenient.

[0011] According to some embodiments of the present utility model, a notch is provided on the side wall of the welding sleeve, and the notch cooperates with the guiding section to introduce the lead-out rod into the welding sleeve. The opening of the notch can make it easier to press the lead-out rod in, making the installation of the welding sleeve and the lead-out rod more convenient.

[0012] According to some embodiments of the present utility model, a flared opening is provided at one end of the welding sleeve, and the flared opening faces the sealing glue. Providing a flared opening at one end of the welding sleeve can make the lead-out rod easier to be introduced into the welding sleeve.

[0013] According to some embodiments of the present utility model, a flange extends circumferentially from the flared opening, the end face of the flange faces the sealing glue, and the flange and the flared opening cooperate to introduce the lead-out rod into the welding sleeve. The cooperation of the flange and the flared opening can further make the lead-out rod easier to be pressed into the welding sleeve.

[0014] In a second aspect, the present utility model provides an automotive water pump, which includes a pump body, a pump cover, and an electric heating tube as described in the first aspect above.

[0015] The automotive water pump according to an embodiment of the present utility model has at least the following beneficial effects: By providing a welding sleeve on the lead-out rod of the electric heating tube, and welding the welding sleeve to the circuit board, the connection between the electric heating tube and the circuit board is realized. The structure of the welding sleeve is small and the assembly is simple, which greatly increases the available layout space on the circuit board, makes the parts of the automotive water pump more compact and lightweight, and has a high manufacturing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings are used to provide a further understanding of the technical solution of the present utility model, and constitute a part of the specification. Together with the embodiments of the present utility model, they are used to explain the technical solution of the present utility model, and do not constitute a limitation to the technical solution of the present utility model.

[0017] Figure 1 is an overall schematic diagram of the electric heating tube 100 provided by an embodiment of the present utility model;

[0018] Figure 2 is Figure 1 a schematic diagram of the resistance wire 200 of the electric heating tube 100 shown;

[0019] Figure 3 is a partial external shape schematic diagram of the visible circuit board 500 in the automotive water pump provided by another embodiment of the present utility model;

[0020] Figure 4 is Figure 3 a partial top view schematic diagram of the visible electric heating tube 100 welded to the circuit board 500 in the automotive water pump shown;

[0021] Figure 5 is a partial schematic diagram of the electric heating tube 100 provided by an embodiment of the present utility model;

[0022] Figure 6 is Figure 5 an A-A cross-sectional view of the electric heating tube 100 shown;

[0023] Figure 7 is a partial schematic diagram of the electric heating tube 100 provided by another embodiment of the present utility model;

[0024] Figure 8 is Figure 7 a B-B cross-sectional view of the electric heating tube 100 shown;

[0025] Figure 9 is Figure 8 a partial enlarged view of the electric heating tube 100 shown;

[0026] Figure 10Yes Figure 7 Schematic diagram of the welding sleeve 220 of the electric heating tube 100 shown;

[0027] Figure 11 Schematic diagram of the welding sleeve 220 provided by another embodiment of the present utility model;

[0028] Figure 12 Partial schematic diagram of the electric heating tube 100 provided by another embodiment of the present utility model;

[0029] Figure 13 Yes Figure 12 C-C cross-sectional view of the electric heating tube 100 shown;

[0030] Figure 14 Partial schematic diagram of the electric heating tube 100 provided by another embodiment of the present utility model;

[0031] Figure 15 Yes Figure 14 D-D cross-sectional view of the electric heating tube 100 shown;

[0032] Figure 16 Overall schematic diagram of the automotive water pump provided by another embodiment of the present utility model;

[0033] Figure 17 Yes Figure 16 E-E cross-sectional view of the automotive water pump shown.

[0034] Reference numerals:

[0035] Electric heating tube 100;

[0036] Resistance wire 200; lead-out rod 210; welding sleeve 220; bump 221; guiding section 222; notch 230; flared opening 240; flanging 250;

[0037] Metal tube 300; tube opening 310; sealing glue 320; through hole 321;

[0038] Filling medium 400;

[0039] Circuit board 500; welding through hole 510; tin plating layer 520;

[0040] Pump body 600; heating module 610;

[0041] Pump cover 700. Detailed implementation manners

[0042] Embodiments of the present utility model will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where like or similar reference numerals denote like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary only for explaining the present utility model and should not be construed as limiting the present utility model.

[0043] In the description of the present utility model, it should be understood that with respect to the orientation description, such as the up, down, etc., the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as limiting the present utility model.

[0044] In the description of the present utility model, "a plurality of" means more than two. If there is a description of "first" and "second", it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0045] In the description of the present utility model, unless otherwise clearly defined, words such as "arrangement", "installation", "connection", etc. should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meanings of the above words in the present utility model in combination with the specific content of the technical solution.

[0046] Refer to Figures 1 to 6, the electric heating tube 100 includes a resistance wire 200, a metal tube 300, and a filling medium 400. The resistance wire 200 is installed inside the metal tube 300. The filling medium 400 is an insulating material that can prevent the electric heating tube 100 from leaking electricity. The filling medium 400 is centered along the tube axis of the metal tube with the resistance wire 200 and is filled between the resistance wire 200 and the inner wall of the metal tube 300. At the nozzle 310 of the metal tube 300, there is a sealing glue 320. The sealing glue 320 is sleeved on the outer wall of the metal tube 300 and the end of the nozzle 310. A through hole 321 is provided in the center of the sealing glue 320. One end of the resistance wire 200 is provided with a metal lead rod 210. At least part of the lead rod 210 passes through the through hole 321. A columnar metal welding sleeve 220 with a blind hole is sleeved on the outer wall of the lead rod 210 of the passing part. The material of the welding sleeve 220 is copper, brass, or both with a pre-tinned surface (it can also be pre-gilded or pre-silvered) for soldering connection with the circuit board 500. One end of the welding sleeve 220 faces the end face of the sealing glue 320, and the other end is located at the end of the lead rod 210. The outer peripheral surface of this end is a tin-platable material for soldering the lead rod 210 to the circuit board 500 through the welding sleeve 220. By providing the welding sleeve 220 on the lead rod 210 of the electric heating tube 100 and then soldering through the welding sleeve 220 with the circuit board 500, the electric heating tube 100 is connected to the circuit board 500. Since the welding sleeve 220 is directly sleeved on the outer wall of the lead rod 210, there is no need to assemble additional components such as wires or screws. While realizing the electrical connection between the electric heating tube 100 and the circuit board 500, it can save a large amount of occupied space for the circuit board 500. In addition, the installation of the welding sleeve 220 is simpler and more convenient, and it is easier to achieve automation.

[0047] Refer to Figure 6 , the connection method between the welding sleeve 220 and the lead rod 210 is percussion welding. Since the material of the resistance wire 200 is generally nickel-chromium wire or iron-chromium wire, the material of the lead rod 210 welded to the resistance wire 200 is generally iron-based alloy. This material is not easy to be tinned and is difficult to be soldered to the circuit board 500, while the tin-platable metal can be more easily soldered to the circuit board 500 and the connection is firm. Therefore, a welding sleeve 220 with a tin-platable surface is used to perform percussion welding with the lead rod 210. After welding the lead rod 210 inside the welding sleeve 220, the welding sleeve 220 is soldered to the circuit board 500 to realize the connection between the electric heating tube 100 and the circuit board 500.

[0048] Another connection method between the welding sleeve 220 and the lead rod 210 in this application can also be riveting. It should be noted that the welding sleeve 220 used for riveting is a blind hole. The welding sleeve 220 is riveted into the lead rod 210 through a riveting machine, and then the welding sleeve 220 is soldered to the circuit board 500 to realize the connection between the electric heating tube 100 and the circuit board 500.

[0049] Refer toFigure 10 The connection between the welding sleeve 220 and the lead bar 210 is by hot sleeving or cold pressing. The inner diameter of the welding sleeve 220 is smaller than the diameter of the lead bar 210. Since the inner diameter of the welding sleeve 220 is smaller than the diameter of the lead bar 210, when hot sleeving or cold pressing, the welding sleeve 220 will tightly hold the lead bar 210 after being sleeved, forming a reliable connection and not easily falling off.

[0050] Exemplarily, the hot sleeving connection method is to heat, such as eddy current heating, to make the welding sleeve 220 expand due to heat. The welding sleeve 220 can be easily sleeved onto the lead bar 210, and then the welding sleeve 220 will shrink after cooling to tightly hold the lead bar 210. The cold pressing connection method is to forcefully press the welding sleeve 220 onto the lead bar 210 by a press, causing the welding sleeve 220 to expand but tightly hold the lead bar 210.

[0051] It can be understood that the difference between the inner diameter of the welding sleeve 220 and the diameter of the lead bar 210 is greater than or equal to 0.05 mm and less than or equal to 0.3 mm. This application does not specifically limit the inner diameter of the welding sleeve 220 and the diameter of the lead bar 210.

[0052] Reference Figure 6 、 Figure 8 、 Figure 9 、 Figure 13 and Figure 15 On the surface of the welding sleeve 220, there is a tin plating layer 520. On the circuit board 500, there is a welding through-hole 510. At least part of the lead bar 210 and the welding sleeve 220 pass through the welding through-hole 510. The tin plating layer 520 of the welding sleeve 220 is connected to the welding through-hole 510 by spot welding. At least a part of one end of the tin plating layer 520 extends beyond one end face of the welding through-hole 510, and at least a part of the other end of the tin plating layer 520 extends beyond the other end face of the welding through-hole 510 to prevent the occurrence of false soldering.

[0053] Preferably, the other end of the tin plating layer 520 is at least 1.5 mm higher than the end face of the welding through-hole 510. This application does not specifically limit the height by which the tin plating layer 520 extends beyond the end face of the welding through-hole 510.

[0054] Reference Figures 7 to 10 On the inner wall of the welding sleeve 220, there are convex points 221. When the welding sleeve 220 is spot welded to the lead bar 210, the temperature of these convex points 221 is higher, making the connection between the welding sleeve 220 and the lead bar 210 more reliable. There is a guiding section 222 left between the convex points 221 and one end of the welding sleeve 220. Preferably, the guiding distance of the guiding section 222 is greater than or equal to 1 mm. Specifically, when installing the welding sleeve 220, the lead bar 210 first enters this guiding section 222 and then is introduced into the welding sleeve 220, improving the installation stability. In addition, the welding sleeve 220 and the lead bar 210 are in interference fit or transition fit, further enhancing the installation stability.

[0055] Reference Figure 11 Figure 11

[0056] Reference Figure 12 and Figure 13 Figure 13

[0057] Reference Figure 14 and Figure 15 Figure 15

[0058] Reference Figure 3 、 Figure 4 、 Figure 16 and Figure 17 Figure 17

[0059] The above has described the embodiments of the present invention in detail with reference to the drawings. However, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge scope of those of ordinary skill in the art.

Claims

1. An electric heating tube (100), comprising: A resistance wire (200), a metal tube (300) and a filling medium (400), wherein the filling medium (400) is filled between the resistance wire (200) and the inner wall of the metal tube (300) with the resistance wire (200) centered along the tube axis in the metal tube; characterized in that a sealing glue (320) is provided at the tube mouth (310) of the metal tube (300), the sealing glue (320) is sleeved on the outer wall of the metal tube (300) and the end of the tube mouth (310), and a through hole (321) is provided at the center of the sealing glue (320) One end of the resistance wire (200) is connected to a metal lead-out rod (210), at least a portion of the lead-out rod (210) passes through the through hole (321), at least a portion of the outer wall of the lead-out rod (210) is sleeved with a columnar metal welding sleeve (220) with a blind hole, one end of the welding sleeve (220) faces the end surface of the sealing glue (320), and the other end is located at the end of the lead-out rod (210), and the outer peripheral surface of the end is a tin-platable material, so that the lead-out rod (210) can be welded to the circuit board (500) through the welding sleeve (220).

2. The electric heating tube (100) according to claim 1, characterized in that: The welding sleeve (220) and the lead-out rod (210) are sleeved in a manner of butt welding or riveting.

3. The electric heating tube (100) according to claim 1, characterized in that: The welding sleeve (220) and the lead-out rod (210) are sleeved in a hot-sleeving or cold-pressing manner, and the inner diameter of the welding sleeve (220) is smaller than the diameter of the lead-out rod (210).

4. The electric heating tube (100) according to claim 1, characterized in that: The surface of the welding sleeve (220) includes a tin-plated layer (520), the circuit board (500) includes a welding through hole (510), the lead-out rod (210) and the welding sleeve (220) pass through the welding through hole (510), the tin-plated layer (520) of the welding sleeve (220) is connected to the welding through hole (510) by soldering, at least a portion of one end of the tin-plated layer (520) protrudes from one end surface of the welding through hole (510), and at least a portion of the other end of the tin-plated layer (520) protrudes from the other end surface of the welding through hole (510).

5. The electric heating tube (100) according to claim 2, characterized in that: A convex point (221) is provided on the side wall of the welding sleeve (220), a guide section (222) is left between the convex point (221) and one end of the welding sleeve (220), the guide distance of the guide section (222) is greater than or equal to 1 mm, and the welding sleeve (220) and the lead-out rod (210) are interference fit or transition fit.

6. The electric heating tube (100) according to claim 5, characterized in that: A notch (230) is provided on the side wall of the welding sleeve (220), and the notch (230) cooperates with the guide section (222) to guide the lead-out rod (210) into the welding sleeve (220).

7. The electric heating pipe (100) according to claim 3, characterized in that: A bell mouth (240) is provided at one end of the welding sleeve (220), and the bell mouth (240) faces the sealing glue (320).

8. The electric heating pipe (100) according to claim 7, characterized in that: The bell mouth (240) extends out a flange (250) in the circumferential direction, the end face of the flange (250) faces the sealing glue (320), and the flange (250) cooperates with the bell mouth (240) to guide the lead-out rod (210) into the welding sleeve (220).

9. An automobile water pump, characterized in that: It comprises a pump body (600), a pump cover (700), and the electric heating pipe (100) according to any one of claims 1 to 8.

Images