Submerged electric heater and lubrication system for gearboxes

Abstract

The utility model belongs to lubricating oil heating technical field discloses a kind of immersion electric heater and lubricating system for gear box. The immersion electric heater includes heating element, flange and terminal box, heating element can generate heat after electrification;Heating element is fixedly connected to flange, and the side, departing from heating element, of flange is provided with terminal stud, and terminal stud is electrically connected with heating element;Terminal box cover is equipped in terminal stud, and terminal box is detachably connected to flange, and terminal box is provided with the wire hole for the power cord of being arranged in on, power cord is arranged in wire hole, and power cord is detachably connected with terminal stud. The immersion electric heater when carrying out internal wiring, terminal box can be directly detached from flange, to greatly increase the wiring operation space of staff, avoid the wiring difficulty, inconvenient inspection and other problems caused by wiring in the narrow terminal box inside, to improve the wiring efficiency and the reliability of power cord and terminal stud connection.

Description

Technical Field

[0001] This utility model relates to the field of lubricating oil heating technology, and in particular to an immersion electric heater and a lubrication system for gearboxes. Background Technology

[0002] Traditional wind turbine gearboxes often use immersion electric heaters to heat the lubricating oil in the oil chamber, thereby reducing the viscosity and improving the fluidity of the lubricating oil. An immersion electric heater is a device that heats the oil by completely immersing the heating element in a liquid medium (such as water or oil). It mainly consists of a heating core and a junction box on top. The heating core uses a high-temperature resistant alloy heating wire as the heat source, and the heating wire is covered with a sheath. The junction box is connected to the heating core via a connecting flange and contains terminals and a power cord. The power cord is connected to an external power source to supply power to the heating wire through the terminals.

[0003] Currently, commonly used immersion electric heaters require manual wiring of the terminals. Specifically, the end cap on the junction box is unscrewed, and then the operator reaches into the junction box to connect the power cord and the terminals. However, due to the limited space inside the gearbox, the junction box of the immersion electric heater is usually small, resulting in a cramped operating space inside the junction box, which brings great inconvenience to the wiring operation.

[0004] Therefore, there is an urgent need to design an immersion electric heater to solve the above-mentioned problems in the existing technology. Utility Model Content

[0005] The purpose of this invention is to provide an immersion electric heater and a lubrication system for a gearbox.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] Immersion electric heater, including:

[0008] A heating element that generates heat when powered on;

[0009] A flange is provided on which the heating element is fixedly connected. A terminal post is provided on the side of the flange away from the heating element, and the terminal post is electrically connected to the heating element.

[0010] A junction box is provided, which is covered by the terminal block and is detachably connected to the flange. The junction box has an outlet hole for a power cord to pass through, the power cord passes through the outlet hole, and the power cord is detachably connected to the terminal block.

[0011] Preferably, the junction box is threadedly connected to the flange.

[0012] Preferably, the flange is provided with a protrusion, the outer peripheral surface of the protrusion is provided with an external thread, and the junction box is provided with an internal thread that matches the external thread.

[0013] Preferably, the outer surface of the junction box is provided with an anti-slip structure.

[0014] Preferably, the junction box is provided with a hook at the end near the flange, and the flange is provided with a snap-fit ​​groove, and the hook is snapped into the snap-fit ​​groove.

[0015] Preferably, the axis of the outlet hole is parallel to the axis of the terminal block.

[0016] Preferably, a gland is provided in the outlet hole, which can fix the power cord.

[0017] Preferably, the flange has a connection hole for fasteners to be inserted, and the fasteners are used to connect the flange and the oil tank.

[0018] Preferably, the flange has weight-reducing holes.

[0019] A gearbox lubrication system includes an oil reservoir and the aforementioned immersion electric heater. The oil reservoir is used to store lubricating oil, the flange is fixedly connected to the oil reservoir, and the heating element is immersed in the lubricating oil.

[0020] The beneficial effects of this utility model are as follows:

[0021] The immersion electric heater provided by this utility model includes a heating element, a flange, and a junction box. The heating element is fixedly connected to the flange, and a terminal block is provided on the side of the flange opposite to the heating element. The power cord is electrically connected to the heating element through the terminal block, so the heating element can generate heat to heat the surrounding fluid. Since the junction box is connected to the flange, and the junction box covers the terminal block, and the power cord passes through the outlet hole of the junction box, the junction box can protect the terminal block on the flange and the power cord to ensure the normal operation of the immersion electric heater. Since the junction box is detachably connected to the flange, when wiring the immersion electric heater, the junction box can be directly removed from the flange, which greatly increases the wiring operation space for the operator and avoids the problems of wiring difficulties and inconvenient inspection caused by wiring in a small junction box, thereby improving wiring efficiency and the reliability of the connection between the power cord and the terminal block.

[0022] The gearbox lubrication system provided by this utility model includes an oil reservoir and the aforementioned immersion electric heater. The oil reservoir stores lubricating oil. Since the immersion electric heater is fixedly connected to the oil reservoir via a flange, and the heating element is immersed in the lubricating oil in the oil reservoir, the immersion electric heater can heat the lubricating oil through the heating element after being energized, thereby improving the fluidity of the lubricating oil in low-temperature environments. Since the junction box of the immersion electric heater is detachably connected to the flange, when wiring or disconnection is required, the junction box can be directly removed from the flange, avoiding wiring difficulties and inconvenience caused by wiring inside the confined junction box, thereby improving wiring efficiency and the reliability of the connection between the power cord and the terminal. Attached Figure Description

[0023] Figure 1 This is a cross-sectional view of the immersion electric heater provided in a specific embodiment of this utility model.

[0024] In the picture:

[0025] 1-Heating element;

[0026] 2-Flange; 21-Raised portion;

[0027] 3-Terminals;

[0028] 4- Junction box; 41- Outlet hole. Detailed Implementation

[0029] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0030] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0031] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0032] In the description of this embodiment, the terms "upper," "lower," "right," and "left," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0033] like Figure 1 As shown, this utility model provides an immersion electric heater, which includes a heating element 1, a flange 2, and a junction box 4. The heating element 1 generates heat when energized. The heating element 1 is fixedly connected to the flange 2. A terminal post 3 is provided on the side of the flange 2 away from the heating element 1, and the terminal post 3 is electrically connected to the heating element 1. The junction box 4 covers the terminal post 3 and is detachably connected to the flange 2. The junction box 4 has an outlet hole 41 for passing a power cord through it, and the power cord passes through the outlet hole 41 and is detachably connected to the terminal post 3. In this embodiment, the heating element 1 is fixedly connected to the flange 2. A terminal block 3 is provided on the side of the flange 2 opposite to the heating element 1. The power cord is electrically connected to the heating element 1 through the terminal block 3, so the heating element 1 can generate heat to heat the surrounding fluid. Since a junction box 4 is connected to the flange 2, and the junction box 4 covers the terminal block 3, and the power cord passes through the outlet hole 41 of the junction box 4, the junction box 4 can protect the terminal block 3 on the flange 2 and the power cord to ensure the normal operation of the immersion electric heater. Since the junction box 4 is detachably connected to the flange 2, when wiring the immersion electric heater, the junction box 4 can be directly removed from the flange 2, which greatly increases the wiring operation space for the operator and avoids the problems of wiring difficulties and inconvenient inspection caused by wiring in the narrow junction box 4, thereby improving wiring efficiency and the reliability of the connection between the power cord and the terminal block 3.

[0034] In this embodiment, the heating element 1 is made of a high-temperature resistant alloy heating wire and a sheath commonly used in the art. The heating wire can generate heat after being energized, thereby heating the surrounding fluid. One end of the power cord is fixedly connected to the terminal 3, and the other end is connected to the power supply, thereby supplying current to the heating element 1. It can be understood that the immersion electric heater includes multiple heating elements 1, and a terminal 3 is provided for each heating element 1. The terminal 3 is fixed on the flange 2, and the end of the terminal 3 is fixedly connected to the heating element 1. Therefore, multiple terminals 3 are provided on the flange 2.

[0035] The detachable connection between the junction box 4 and the flange 2 can be configured according to actual conditions, as long as convenient disassembly and assembly are ensured. In this embodiment, the junction box 4 and the flange 2 are threadedly connected, and the operator can disassemble and assemble the junction box 4 with the flange 2 by screwing it on. Specifically, the flange 2 is provided with a protrusion 21, which protrudes from the end face of the flange 2 and is integrally formed with the flange 2. The protrusion 21 has a smooth outer peripheral surface and is provided with an external thread. The junction box 4 is provided with an internal thread that matches the external thread. It can be understood that the protrusion 21 can be a cylindrical structure or a ring structure, as long as it can be threadedly connected to the junction box 4 through the external thread on its outer peripheral surface. In another embodiment, the junction box 4 is snap-fitted to the flange 2, allowing the operator to assemble and disassemble it by inserting and removing the junction box 4. Specifically, the junction box 4 has hooks near the end of the flange 2, and two hooks are symmetrically arranged on the outer wall of the bottom of the junction box 4. Correspondingly, two locking blocks are arranged on the end face of the flange 2. The two locking blocks have recessed locking grooves on the side facing the junction box 4. The operator aligns the two hooks of the junction box 4 with the two locking blocks and presses them vertically to snap the junction box 4 to the flange 2. When it is necessary to remove the junction box 4, the operator squeezes the junction box 4 from the outer wall and pulls it upward to remove the junction box 4 from the flange 2.

[0036] Furthermore, the outer surface of the junction box 4 is provided with an anti-slip structure, which can increase the friction between the junction box 4 and the human hand, thereby making it easier for the operator to twist the junction box 4, thus improving the practicality of the immersion electric heater; in this embodiment, the anti-slip structure is an anti-slip protrusion protruding from the outer surface of the junction box 4.

[0037] To further improve the ease of operation when wiring this immersion electric heater, such as Figure 1 As shown, the axis of the outlet hole 41 is parallel to the axis of the terminal block 3. After the power cord is connected to the terminal block 3, it can extend directly upward along the length direction through the outlet hole 41 without having to bend the power cord to extend from the side of the junction box 4. This improves the convenience of wiring operations and also extends the service life of the power cord.

[0038] Furthermore, a gland is provided in the outlet hole 41, which can fix the power cord. In this embodiment, the gland is a commonly used cable fixing connector in the art. The gland can be threaded into the outlet hole 41 and has a through hole for the power cord to pass through. The specific structure and working principle of the gland will not be described in detail here. By using the gland, the power cord can be fixed and protected. At the same time, the gland can also seal the outlet hole 41 to prevent external moisture or foreign objects from entering the junction box 4 through the outlet hole 41 and causing a short circuit in the terminal block 3.

[0039] Flange 2 is a commonly used metal connector in the art. Flange 2 has connection holes for fasteners to pass through, and the fasteners are used to connect flange 2 and the oil tank. In this embodiment, the fasteners include bolts and nuts. The shank of the bolt passes through the connection hole of flange 2 and the bolt hole of the oil tank and is then connected to the nut, thereby fixing flange 2 to the oil tank.

[0040] To reduce the weight of the immersion electric heater and further improve its practicality, weight-reducing holes are provided on the flange 2. In this embodiment, both the connection holes and the weight-reducing holes of the flange 2 are located outside the area covered by the junction box 4; multiple connection holes are evenly distributed along the circumference of the flange 2, and multiple weight-reducing holes are also evenly distributed along the circumference of the flange 2.

[0041] The wiring and assembly process of the immersion electric heater provided in this embodiment is roughly as follows:

[0042] First, the workers use bolts and nuts to secure flange 2 to the oil tank. Then, one end of the power cord is passed through the outlet hole 41 and connected to terminal 3. After the power cord is connected to terminal 3, the workers place junction box 4 on flange 2 and screw it on to connect it to flange 2 via threads. Next, the workers install the gland in outlet hole 41 to secure the power cord, thus completing the wiring and assembly of the immersion heater. It is understood that multiple power cords and terminals 3 are provided in a one-to-one correspondence.

[0043] This embodiment also provides a gearbox lubrication system, which includes an oil reservoir and the aforementioned immersion electric heater. The oil reservoir stores lubricating oil, and a flange 2 is fixedly connected to the oil reservoir, with the heating element 1 immersed in the lubricating oil. In this embodiment, since the immersion electric heater is fixedly connected to the oil reservoir via the flange 2, and the heating element 1 is immersed in the lubricating oil in the oil reservoir, the immersion electric heater can heat the lubricating oil through the heating element 1 after being energized, thereby improving the fluidity of the lubricating oil in low-temperature environments. Since the junction box 4 of the immersion electric heater is detachably connected to the flange 2, when wiring or disconnection is required, the junction box 4 can be directly removed from the flange 2, avoiding wiring difficulties and inconvenience caused by wiring inside the confined junction box 4, thereby improving wiring efficiency and the reliability of the connection between the power cord and the terminal block 3.

[0044] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. An immersion electric heater, characterized in that, include: Heating element (1), which generates heat when energized; A flange (2) is provided on the flange (2), and the heating element (1) is fixedly connected to the flange (2). A terminal (3) is provided on the side of the flange (2) away from the heating element (1). The terminal (3) is electrically connected to the heating element (1). Junction box (4), the junction box (4) is covered by the terminal block (3), and the junction box (4) is detachably connected to the flange (2). The junction box (4) has an outlet hole (41) for passing through the power cord. The power cord passes through the outlet hole (41), and the power cord is detachably connected to the terminal block (3).

2. The immersion electric heater according to claim 1, characterized in that, The junction box (4) is threadedly connected to the flange (2).

3. The immersion electric heater according to claim 2, characterized in that, The flange (2) is provided with a protrusion (21), the outer circumferential surface of the protrusion (21) is provided with an external thread, and the junction box (4) is provided with an internal thread that matches the external thread.

4. The immersion electric heater according to claim 3, characterized in that, The outer surface of the junction box (4) is provided with an anti-slip structure.

5. The immersion electric heater according to claim 1, characterized in that, The junction box (4) is provided with a hook at the end near the flange (2), and the flange (2) is provided with a snap-fit ​​groove, and the hook is snapped into the snap-fit ​​groove.

6. The immersion electric heater according to claim 1, characterized in that, The axis of the outlet hole (41) is parallel to the axis of the terminal block (3).

7. The immersion electric heater according to claim 6, characterized in that, A gland is provided in the outlet hole (41), which can fix the power cord.

8. The immersion electric heater according to claim 1, characterized in that, The flange (2) has a connection hole for fasteners to be inserted, and the fasteners are used to connect the flange (2) and the oil storage tank.

9. The immersion electric heater according to any one of claims 1-8, characterized in that, The flange (2) has a weight reduction hole.

10. A lubrication system for a gearbox, characterized in that, The device includes an oil storage tank and an immersion electric heater as described in any one of claims 1-9, wherein the oil storage tank is used to store lubricating oil, the flange (2) is fixedly connected to the oil storage tank, and the heating element (1) is immersed in the lubricating oil.

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