Motor terminal box structure with high sealing performance

Abstract

The application relates to the technical field of motors, in particular to a high-sealing motor junction box structure which comprises a box body and a box cover, a fastening assembly for fastening the box body and the box cover is arranged in the inner cavity of the box body, a driving assembly matched with the fastening assembly is arranged on the side wall of the box body, and a wire inlet pipe is arranged on the side wall of the box body; the fastening assembly comprises a square frame, the horizontal end of the square frame is fixedly connected with the inner wall of the box body, a fastening strip is slidably arranged on the side surface of the square frame, and a ring-shaped air bag is arranged on the side surface of the square frame close to the inner wall of the box body; when an operator fastens the box body and the box cover from the outside through bolts, the end of the bolt directly pushes the piston rod, the rotary force is converted into linear driving force, the internal linkage mechanism is triggered without feeling, a plurality of fastening strips are simultaneously driven to extend radially and be clamped into the fastening grooves of the box cover, the problem of uneven sealing pressure caused by the long interval of traditional multiple bolts is solved, and the connection integrity and the vibration resistance are enhanced through the circumferentially consistent mechanical clamping.

Description

Technical Field

[0001] This invention relates to the field of generator technology, specifically to a highly sealed motor junction box structure. Background Technology

[0002] As a key component connecting the motor to the external power supply, the sealing performance of the motor junction box directly affects the motor's operational safety and lifespan in harsh environments such as humidity, dust, and corrosion. Currently, common motor junction boxes typically use multiple bolts to directly press a sealing ring between the box body and cover for sealing. This method has the following significant drawbacks: First, the bolts are spaced far apart, resulting in high sealing pressure at the directly compressed bolt areas, while the pressure between adjacent bolts is significantly reduced, creating weak points in the seal that allow moisture and dust to intrude, leading to poor overall sealing uniformity. Second, the static sealing ring, which relies on bolt tightening force, is prone to permanent compression deformation or material aging and cracking after long-term pressure, leading to reduced sealing pressure or even failure, resulting in insufficient long-term reliability of the seal. Therefore, this invention develops a motor junction box structure with high sealing performance. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of existing technologies, such as uneven sealing pressure and poor durability due to reliance on static seals, and to provide a motor junction box structure with high sealing performance. This structure converts the tightening force of external bolts into internal linkage locking force, achieving uniform and reliable circumferential locking of the box cover, effectively improving the uniformity and reliability of the seal.

[0004] To achieve the above objectives, the technical solution provided by the present invention is as follows:

[0005] A highly sealed motor junction box structure includes a box body and a box cover that are fixed by bolts. The inner cavity of the box body is equipped with a fastening assembly for fastening the box body and the box cover. The side wall of the box body is provided with a drive assembly that cooperates with the fastening assembly. The side wall of the box body is provided with a cable inlet pipe.

[0006] The fastening assembly includes a square frame surrounding the inner wall of the box, and the cross-sectional shape of the square frame is an upwardly bent L-shape. The horizontal end of the square frame is fixedly connected to the inner wall of the box. A fastening strip is slidably and sealingly provided on the upper part of the vertical end of the square frame near the inner wall of the box, with one end of the fastening strip located inside the square frame and the other end located outside the square frame. The inside of the square frame is a hollow structure. An annular airbag is installed on the side of the square frame near the inner wall of the box, and the annular airbag is used to seal the joint between the box body and the box lid. The annular airbag is connected to the square frame.

[0007] The drive assembly includes a sealing seat installed on the side wall of the box, a piston block is slidably connected inside the sealing seat, a piston rod is installed on the top of the piston block, the interior of the sealing seat is connected to the interior of the horizontal end of the square frame, and the communication port between the sealing seat and the horizontal end of the square frame is located below the piston block. A first spring is sleeved on the outer wall of the piston rod, and the first spring is located between the top of the piston block and the top of the inner cavity of the sealing seat.

[0008] The box lid has a concave cross-sectional shape, and the inner wall of the box lid has a fastening groove that cooperates with the fastening strip. The fastening strip is used to extend outward and engage with the fastening groove when the air pressure inside the square frame increases.

[0009] The side wall of the box is provided with bolt posts that are threaded to the bolts, and the bolt posts are hollow structures. One of the bolt posts is connected to the sealing seat. One end of the piston rod is inserted into the inner cavity of the bolt post, and the outer diameter of the piston rod is smaller than the inner diameter of the bolt post.

[0010] Preferably, the lower edge of the fastening strip and the bottom of the fastening groove are provided with mutually cooperating bevels.

[0011] Preferably, the number of driving components is four, which are respectively arranged on the four side walls of the box, and the number of fastening strips matches the number of driving components.

[0012] Preferably, a cylindrical airbag is fixedly installed on the inner wall of the inlet pipe, the cylindrical airbag is connected to a corresponding sealing seat, and the communication port between the cylindrical airbag and the sealing seat is located below the piston block.

[0013] Preferably, the top of the box is equipped with four indicator components for indicating whether the fastening components are properly engaged.

[0014] Preferably, the indicator assembly includes a transparent indicator tube installed on the top of the box and a sealing block installed on the top of the inner wall of the fastening groove. The sealing block is connected to the transparent indicator tube, and a red indicator block is slidably connected inside the transparent indicator tube. A slider is slidably connected to one end of the sealing block near the square frame, and one end of the slider protrudes from the sealing block.

[0015] Preferably, a second spring is provided between the end of the slider and the inner wall of the sealing block.

[0016] Preferably, the top opening edge of the box lid is provided with a sealing groove, and the bottom edge of the box body is provided with a sealing strip that cooperates with the sealing groove.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] When the operator externally fixes the junction box to the cover using bolts, the bolt ends directly push the piston rod, converting rotational force into linear driving force. This triggers the internal linkage mechanism imperceptibly, causing multiple locking strips to extend radially simultaneously and engage with the locking grooves in the cover. This not only solves the problem of uneven sealing pressure caused by the long spacing of traditional multiple bolts, but also enhances the overall integrity and vibration resistance of the connection through consistent circumferential mechanical engagement. At the same time, as the system pressure increases and drives the locking strips, the annular airbag inflates and expands, dynamically filling the joint gaps. This adaptive compensation capability replaces the traditional static sealing ring, effectively avoiding sealing failure caused by permanent deformation. Thus, while ensuring ease of operation, it greatly improves the sealing uniformity, reliability, and long-term effectiveness of the junction box. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the junction box of the present invention;

[0021] Figure 2 This is a schematic diagram of the front section structure of the junction box of the present invention;

[0022] Figure 3 for Figure 2 Enlarged structural diagram at point A;

[0023] Figure 4 for Figure 2 Enlarged structural diagram at point B;

[0024] Figure 5 This is a schematic diagram of the front section structure of the junction box of the present invention after the box body and the box cover are fastened together;

[0025] Figure 6 for Figure 5 Enlarged schematic diagram of the structure at point C;

[0026] Figure 7 This is a schematic diagram of the connection structure between the inlet pipe and the drive assembly in the junction box of the present invention;

[0027] Figure 8 This is a schematic diagram of the fastening assembly in the junction box of the present invention;

[0028] Figure 9 This is a schematic diagram of the junction box of the present invention installed on the motor.

[0029] The attached diagram lists the components represented by each number as follows:

[0030] 1. Box body; 11. Bolt post; 2. Box cover; 21. Fastening groove; 3. Fastening assembly; 31. Square frame; 32. Fastening strip; 33. Annular airbag; 4. Drive assembly; 41. Sealing seat; 42. Piston block; 43. Piston rod; 44. First spring; 5. Inlet pipe; 51. Cylindrical airbag; 6. Indicating assembly; 61. Transparent indicator tube; 62. Sealing block; 63. Indicating block; 64. Slider; 65. Second spring. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] like Figure 1-8 As shown:

[0033] A highly sealed motor junction box structure includes a box body 1 and a box cover 2 that are fixed by bolts. The inner cavity of the box body 1 is equipped with a fastening component 3 for fastening the box body 1 and the box cover 2. The side wall of the box body 1 is provided with a drive component 4 that cooperates with the fastening component 3. The side wall of the box body 1 is provided with an inlet pipe 5.

[0034] The fastening assembly 3 includes a square frame 31 surrounding the inner wall of the box body 1, and the cross-sectional shape of the square frame 31 is an upwardly bent L-shape. The horizontal end of the square frame 31 is fixedly connected to the inner wall of the box body 1. A fastening strip 32 is slidably and sealingly provided on the upper part of the vertical end of the square frame 31 near the inner wall of the box body 1. One end of the fastening strip 32 is located inside the square frame 31, and the other end is located outside the square frame 31. The inside of the square frame 31 is a hollow structure. An annular airbag 33 is installed on one side of the square frame 31 near the inner wall of the box body 1. The annular airbag 33 is used to seal the joint between the box body 1 and the box cover 2. The annular airbag 33 is connected to the square frame 31.

[0035] The drive assembly 4 includes a sealing seat 41 installed on the side wall of the housing 1. A piston block 42 is slidably connected inside the sealing seat 41. A piston rod 43 is installed on the top of the piston block 42. The interior of the sealing seat 41 is connected to the interior of the horizontal end of the square frame 31. The communication port between the sealing seat 41 and the horizontal end of the square frame 31 is located below the piston block 42. A first spring 44 is sleeved on the outer wall of the piston rod 43. The first spring 44 is located between the top of the piston block 42 and the top of the inner cavity of the sealing seat 41.

[0036] The box cover 2 has a concave cross-sectional shape. The inner wall of the box cover 2 is provided with a fastening groove 21 that cooperates with the fastening strip 32. The fastening strip 32 is used to extend outward and lock into the fastening groove 21 when the air pressure inside the square frame 31 increases.

[0037] The side wall of the box body 1 is provided with a bolt post 11 that is threaded to the bolt. The bolt post 11 is a hollow structure. One bolt post 11 is connected to the sealing seat 41. One end of the piston rod 43 is inserted into the inner cavity of the bolt post 11, and the outer diameter of the piston rod 43 is smaller than the inner diameter of the bolt post 11.

[0038] As described above, when the operator uses bolts to externally fix the junction box of the present invention to the box body and the box cover, the end of the bolt directly pushes the piston rod, converting the rotational force into a linear driving force, thereby triggering the internal linkage mechanism without human contact. This drives multiple fastening strips to extend radially at the same time and engage in the fastening groove of the box cover. This not only solves the problem of uneven sealing pressure caused by the long spacing of traditional multiple bolts, but also enhances the overall integrity and vibration resistance of the connection through circumferentially consistent mechanical engagement. At the same time, when the system pressure increases and drives the fastening strips, the annular airbag will inflate and expand synchronously, dynamically filling the joint gap. This adaptive compensation capability replaces the traditional static sealing ring, effectively avoiding sealing failure caused by permanent deformation. Thus, while ensuring ease of operation, it greatly improves the sealing uniformity, reliability, and long-term effectiveness of the junction box.

[0039] Specifically, the lower edge of the fastening strip 32 and the bottom of the fastening groove 21 are provided with mutually cooperating bevels.

[0040] As described above, by setting mutually cooperating guide ramps, the fastening strip can smoothly slide into the fastening groove along the ramps during extension, greatly reducing the risk of jamming and improving the convenience and smoothness of assembly. At the same time, this ramp structure generates a certain self-locking effect after the fastening is in place, helping to resist the impact of external forces such as vibration on the locked state, further enhancing the stability and reliability of the internal engagement.

[0041] Specifically, there are four drive components 4, which are set on the four side walls of the box 1 respectively, and the number of fastening strips 32 matches the number of drive components 4.

[0042] Specifically, a cylindrical airbag 51 is fixedly installed on the inner wall of the inlet pipe 5. The cylindrical airbag 51 is connected to a corresponding sealing seat 41, and the communication port between the cylindrical airbag 51 and the sealing seat 41 is located below the piston block 42.

[0043] As can be seen from the above description, while the internal locking and sealing of the main sealing surface are inflated, the cylindrical airbag expands and evenly wraps around the cable passing through from all sides, effectively filling the irregular gaps between the cable and the inner wall of the inlet pipe. This solves the problem of weak sealing at the inlet of the junction box, and achieves reliable blocking of water vapor and dust from entering along the cable, forming a complete sealing protection system.

[0044] Specifically, four indicator components 6 are installed on the top of the box 1 to indicate whether the fastening components 3 are properly engaged.

[0045] As described above, this system allows operators or maintenance personnel to quickly and intuitively determine whether each engagement point is reliably locked in place without opening the cover. This avoids the potential risk of seal failure due to incomplete engagement, greatly improving the controllability, accuracy, and safety of the installation and maintenance process.

[0046] Specifically, the indicator component 6 includes a transparent indicator tube 61 installed on the top of the box body 1 and a sealing block 62 installed on the top of the inner wall of the fastening groove 21. The sealing block 62 is connected to the transparent indicator tube 61. A red indicator block 63 is slidably connected inside the transparent indicator tube 61. A slider 64 is slidably connected to one end of the sealing block 62 near the square frame 31, and one end of the slider 64 protrudes from the sealing block 62.

[0047] As described above, the mechanical action of the locking bar triggers a pressure change signal, which is ultimately displayed through the physical displacement of the indicator block inside the transparent indicator cylinder. This design transforms the internally invisible mechanical state of the latch into a clearly visible external visual signal (such as the red block rising), providing clear, intuitive, and reliable indication. Its ingenious structure is closely linked to the locking action, offering accurate and realistic feedback.

[0048] Specifically, a second spring 65 is provided between the end of the slider 64 and the inner wall of the sealing block 62.

[0049] As described above, when the locking strip retracts, the second spring ensures that the slider automatically and quickly returns to its initial position, thereby causing the indicator block to return to its original position and clearly display the "not locked" state. This ensures the timeliness and accuracy of the indicator component's state changes, enabling it to operate cyclically and reliably.

[0050] Specifically, the top opening edge of the lid 2 is provided with a sealing groove, and the bottom edge of the box body 1 is provided with a sealing strip that cooperates with the sealing groove.

[0051] As can be seen from the above description, the sealing strip and sealing groove that cooperate with each other at the joint between the box body and the lid constitute a basic and reliable static seal. This seal, together with the dynamic annular airbag seal, forms a double sealing barrier. Even in the extreme case where one seal fails temporarily, the other seal can still provide a certain degree of protection, which greatly enhances the redundancy and overall safety of the sealing system.

[0052] like Figures 1 to 9 As shown:

[0053] This invention provides a highly airtight motor junction box structure, including a box body 1, a box cover 2, a fastening assembly 3, a drive assembly 4, and an inlet pipe 5, which is installed on the motor during use (e.g., Figure 9 (As shown).

[0054] The box body 1 and the box cover 2 are initially connected by multiple bolts. A roughly L-shaped annular square frame 31 is fixedly installed on the inner wall of the box body 1. The inside of the square frame 31 is a cavity, forming a fluid channel. On the vertical side of the square frame 31, at the position corresponding to the four inner sides of the box body 1, a radial sliding hole is opened. A fastening strip 32 is slidably installed in each sliding hole, with one end of the fastening strip 32 located inside the square frame 31 and the other end located outside the square frame 31. The outer end of the fastening strip 32 has a bevel.

[0055] On each of the four outer side walls of the housing 1, a drive assembly 4 is installed. Each drive assembly 4 includes a sealing seat 41 that is fixed by threads or welding. The sealing seat 41 has a smooth cylindrical hole. A piston block 42 is fitted inside the hole by an O-ring or other sealing element. A piston rod 43 is connected to the piston block 42. The inner cavity of each sealing seat 41 is connected to the fluid channel of the square frame 31 through a thin tube embedded in the wall of the housing 1, thereby forming a closed fluid pressure system filled with air (or incompressible light oil). A first spring 44 is fitted on the piston rod 43 to provide a restoring force. The sealing seat 41 of one of the drive assemblies 4 (e.g., one located on the same side as the inlet pipe 5) is also connected to the inner cavity of a bolt post 11. The front end of the piston rod 43 of the bolt post 11 extends into the bolt post 11.

[0056] The lid 2 has a recessed structure, and its inner wall has a fastening groove 21 corresponding to the position of the four fastening strips 32. The bottom of the groove also has a matching bevel. On the side of the square frame 31 facing the opening end of the box body 1, an annular airbag 33 is glued. The inner cavity of the annular airbag 33 is also connected to the fluid channel of the square frame 31. The opening end of the box body 1 is embedded with a sealing strip, and the corresponding edge of the lid 2 has a sealing groove.

[0057] The inlet pipe 5 is welded to the side wall of the box 1, and a cylindrical airbag 51 is adhered to its inner wall. The cylindrical airbag 51 is connected to the sealing seat 41 of the drive assembly 4 that is connected to the bolt post 11 via a pipe.

[0058] Near the four corners of the top of the box body 1, each indicator component 6 is installed. Each indicator component 6 includes a transparent indicator tube 61 fixed to the box body 1 and a sealing block 62 fixed to the top of the latching groove 21 of the box cover 2 via a bracket. The sealing block 62 is connected to the bottom of the transparent indicator tube 61 via a flexible thin tube. A red, low-density indicator block 63 (such as a sponge block) is placed inside the transparent indicator tube 61. A slider 64 is slidably installed inside the sealing block 62. One end of the slider 64 extends out of the sealing block 62, directly opposite the extension path of the latching strip 32, while the other end is press-fitted with a second spring 65 between it and the inner wall of the sealing block 62.

[0059] Brief description of working principle:

[0060] During assembly, the cover 2 is aligned with the body 1 and closed, and all bolts are pre-tightened. When the specific bolts communicating with the drive assembly 4 are tightened, the ends of the bolts abut against the piston rod 43 and push it inward. The piston block 42 moves accordingly, compressing the sealing seat 41 and the medium in the entire fluid pressure system. The increased system pressure produces the following linkage effect:

[0061] Internal locking: The pressure medium is transmitted through the channel of the square frame 31 to the rear of each locking strip 32, pushing the four locking strips 32 to extend radially outward synchronously. Guided by the inclined surface, the locking strips 32 smoothly engage in the locking groove 21 of the cover 2, achieving internal mechanical locking. This process realizes the efficient conversion and transmission of external bolt tightening force to internal circumferential uniform locking force.

[0062] Dynamic sealing: The pressurized medium enters both the annular airbag 33 and the cylindrical airbag 51 simultaneously. The annular airbag 33 expands and presses tightly against the joint between the box body 1 and the box cover 2, forming the main seal. The cylindrical airbag 51 expands and grips the cable, achieving a seal at the cable inlet.

[0063] Status indication: When the fastening strip 32 is fully extended, its end pushes the corresponding slider 64 inward, compressing the air inside the sealing block 62. The compressed air enters the bottom of the transparent indicator cylinder 61 through a thin tube, pushing the red indicator block 63 upward. The "red mark" can be clearly observed from the outside, indicating that the fastening and sealing on this side is in place. The four indicator components 6 work independently, allowing for comprehensive monitoring of the locking status.

[0064] During disassembly, simply loosen the key bolt. The pressure within the system is released, and under the elastic force of the first spring 44, the piston rod 43 returns to its original position. The locking strip 32 retracts under the action of the built-in spring (or through fluid return). The annular airbag 33 and the cylindrical airbag 51 contract and return to their original positions, and the indicator block 63 falls back under gravity. Then, all bolts can be easily removed, and the cover 2 can be opened.

[0065] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "setting," "connection," "fixing," "screw connection," etc., 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 connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0066] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that variations may be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A highly sealed motor junction box structure, characterized in that: Includes a box body (1) and a box cover (2) that are fixed by bolts. The inner cavity of the box body (1) is equipped with a fastening assembly (3) for fastening the box body (1) and the box cover (2). The side wall of the box body (1) is provided with a driving assembly (4) that cooperates with the fastening assembly (3). The side wall of the box body (1) is provided with an inlet pipe (5). The fastening assembly (3) includes a square frame (31) surrounding the inner wall of the box body (1), and the cross-sectional shape of the square frame (31) is an upwardly bent L-shape. The horizontal end of the square frame (31) is fixedly connected to the inner wall of the box body (1). A fastening strip (32) is provided on the upper part of the vertical end of the square frame (31) near the inner wall of the box body (1). One end of the fastening strip (32) is located inside the square frame (31), and the other end is located outside the square frame (31). The inside of the square frame (31) is a hollow structure. An annular airbag (33) is installed on one side of the square frame (31) near the inner wall of the box body (1). The annular airbag (33) is used to seal the joint between the box body (1) and the lid (2). The annular airbag (33) is connected to the square frame (31). The drive assembly (4) includes a sealing seat (41) installed on the side wall of the box (1). A piston block (42) is slidably connected inside the sealing seat (41). A piston rod (43) is installed on the top of the piston block (42). The interior of the sealing seat (41) is connected to the interior of the horizontal end of the square frame (31). The communication port between the sealing seat (41) and the horizontal end of the square frame (31) is located below the piston block (42). A first spring (44) is sleeved on the outer wall of the piston rod (43). The first spring (44) is located between the top of the piston block (42) and the top of the inner cavity of the sealing seat (41). The box cover (2) has a concave cross-sectional shape. The inner wall of the box cover (2) is provided with a fastening groove (21) that cooperates with the fastening strip (32). The fastening strip (32) is used to extend outward to fit into the fastening groove (21) when the air pressure inside the square frame (31) increases. The side wall of the box body (1) is provided with a bolt post (11) that is threaded to the bolt, and the bolt post (11) is a hollow structure. One of the bolt posts (11) is connected to the sealing seat (41). One end of the piston rod (43) is inserted into the inner cavity of the bolt post (11), and the outer diameter of the piston rod (43) is smaller than the inner diameter of the bolt post (11).

2. The high-sealing motor junction box structure according to claim 1, characterized in that: The lower edge of the fastening strip (32) and the bottom of the fastening groove (21) are provided with mutually cooperating inclined surfaces.

3. The high-sealing motor junction box structure according to claim 1, characterized in that: The number of drive components (4) is four, which are respectively set on the four side walls of the box (1), and the number of fastening strips (32) matches the number of drive components (4).

4. The high-sealing motor junction box structure according to claim 1, characterized in that: A cylindrical airbag (51) is fixedly installed on the inner wall of the inlet pipe (5). The cylindrical airbag (51) is connected to a corresponding sealing seat (41), and the communication port between the cylindrical airbag (51) and the sealing seat (41) is located below the piston block (42).

5. The high-sealing motor junction box structure according to claim 1, characterized in that: The top of the box (1) is equipped with four indicator components (6) for indicating whether the fastening components (3) are fastened in place.

6. The high-sealing motor junction box structure according to claim 5, characterized in that: The indicator assembly (6) includes a transparent indicator tube (61) installed on the top of the box body (1) and a sealing block (62) installed on the top of the inner wall of the fastening groove (21). The sealing block (62) is connected to the transparent indicator tube (61). A red indicator block (63) is slidably connected inside the transparent indicator tube (61). A slider (64) is slidably connected to one end of the sealing block (62) near the square frame (31), and one end of the slider (64) protrudes from the sealing block (62).

7. The high-sealing motor junction box structure according to claim 6, characterized in that: A second spring (65) is provided between the end of the slider (64) and the inner wall of the sealing block (62).

8. The high-sealing motor junction box structure according to claim 1, characterized in that: The top opening edge of the lid (2) is provided with a sealing groove, and the bottom edge of the body (1) is provided with a sealing strip that cooperates with the sealing groove.

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