CN219477532U - Electrical junction box and compressor - Google Patents

Abstract

The present disclosure relates to an electrical junction box and a compressor including the same. The electrical junction box includes a body and a cover connected to the body, the body and the cover configured to collectively define an interior chamber, the cover and the body collectively defining a drain channel located below the interior chamber, the drain channel including an inlet section in fluid communication with the interior chamber and an outlet section in fluid communication with an exterior of the electrical junction box, the drain channel configured such that a fluid flow resistance in the inlet section is less than a fluid flow resistance in the outlet section. The drainage channel is beneficial to smoothly draining water in the electric junction box, and can prevent water and dust from reversely entering the electric junction box through the outlet section without weakening the waterproof and dustproof capabilities of the electric junction box.

Description

Electrical junction box and compressor

Technical Field

The present utility model relates to the field of electrical, in particular to an electrical junction box and a compressor comprising such an electrical junction box.

Background

The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.

Electrical junction boxes for some devices (e.g., compressors) may operate in a wet or splash environment, and therefore, to protect the electronics inside the junction box, the junction box needs to be provided with a certain level of water and dust resistance in order to prevent water and dust from entering the junction box as much as possible. On the other hand, under the condition that water enters the junction box due to sealing failure or condensate water is generated in the junction box, the water needs to be discharged in time, so that safety accidents such as electric leakage and the like are avoided because accumulated water in the junction box damages electronic devices. To meet the waterproof and dustproof grade requirements, conventional electrical junction boxes are generally not provided with drain holes or simply provided with drain holes at the bottom of the junction box. For example, to ensure that the IP54 waterproof and dustproof grade is met, the diameter of the drain hole should be less than or equal to 1mm, however, a drain hole with too small a diameter causes poor drainage and is easily blocked by foreign matter, while on the other hand, if a drain hole with a large diameter (e.g., 3.8mm in diameter) is provided, the possibility of intrusion of external water and dust increases.

Disclosure of Invention

An object of the present disclosure is to provide an electrical junction box including an effective drainage structure and having waterproof and dustproof capabilities.

Another object of the present disclosure is to improve a waterproof and dustproof structure of an electrical junction box.

An aspect of the present disclosure provides an electrical junction box including a body and a cover connected to the body, the body and the cover configured to collectively define an interior chamber, the cover and the body configured to collectively define a drain channel located below the interior chamber, the drain channel including an inlet section in fluid communication with the interior chamber and an outlet section in fluid communication with an exterior of the electrical junction box, the drain channel configured such that a fluid flow resistance in the inlet section is less than a fluid flow resistance in the outlet section.

In some embodiments, the flow area of at least a portion of the inlet section is greater than the flow area of at least a portion of the outlet section.

In some embodiments, the drain channel is configured as a labyrinth, the inlet section defines a "Z" shaped fluid flow path, and/or the outlet section defines another "Z" shaped fluid flow path.

In some embodiments, in the interior chamber, the body and/or the cover define a water trough in fluid communication with the inlet section of the drain channel, the water trough configured to direct water in the interior chamber of the electrical junction box to the inlet section of the drain channel.

In some embodiments, the water trough extends one revolution around the interior chamber of the electrical junction box in a circumferential direction of the electrical junction box.

In some embodiments, the body is provided with an air balance hole.

In some embodiments, the air balance hole is disposed on an underside of the back plate of the body and away from the electronics in the electrical junction box.

In some embodiments, a boss is provided on the back side of the back plate, and the air balance holes are provided adjacently located radially inward of the boss.

In some embodiments, the gas balance holes have a diameter of less than or equal to 1mm.

In some embodiments, the body and/or the cover include an annular water baffle disposed between the body and the cover, the annular water baffle disposed radially outward of the interior chamber about the interior chamber.

In some embodiments, the annular water baffle channel is in fluid communication with the outlet section of the drain channel.

In some embodiments, the top section of the annular water baffle slot is configured to gradually decrease from the center to the sides, and/or the bottom section of the annular water baffle slot is configured to gradually decrease from the sides to the center.

In some embodiments, a flange is provided around the body at the periphery of the cover.

In some embodiments, the body is provided with an axial annular projection projecting in an axial direction of the electrical junction box, and the cover is provided with a seal groove for receiving the axial annular projection.

In some embodiments, a seal is disposed in the seal groove, and in the assembled state, the axial annular projection of the body urges the seal against the cover.

In some embodiments, the depth of the seal groove is greater than the dimension of the seal in the axial direction of the electrical junction box in the uncompressed state.

In some embodiments, the cover is connected to the body by a snap-fit structure.

In some embodiments, the body comprises a snap mount and the cover comprises a snap, the snap and the snap mount being interference fit in a radial direction of the electrical junction box and clearance fit in an axial direction of the electrical junction box in the assembled state.

In some embodiments, the cover is connected to the body by a fastener.

Another aspect of the present disclosure provides a compressor including the electrical junction box according to the above aspect.

The electric junction box according to the present disclosure includes the drain passage preferably configured as a labyrinth, and the fluid flow resistance of the inlet section of the drain passage is smaller than that of the outlet section, which makes it possible for water in the electric junction box to smoothly flow out of the electric junction box through the drain passage by gravity and the fluid flow resistance, and to prevent water from reversely flowing into the electric junction box from the outlet section of the drain passage, thereby not impairing the waterproof and dustproof capability of the electric junction box itself. In addition, the electric junction box according to the present disclosure further improves the waterproof and dustproof capabilities of the electric junction box through the structures of the box cover flange, the annular water blocking groove, the sealing groove, the protruding portion matched with the sealing groove, and the like. Even without installing a seal in the seal groove, the electrical junction box according to the present disclosure can meet the IP54 waterproof and dustproof grade requirements.

Drawings

Embodiments of the present utility model will be described below, by way of example only, with reference to the accompanying drawings. In the drawings, like features or elements are indicated by like reference numerals and the drawings are not necessarily drawn to scale. In the drawings:

FIG. 1 illustrates a perspective view of a compressor with an electrical junction box according to one embodiment of the present disclosure;

fig. 2 schematically illustrates an electronic device mounted within an electrical junction box;

fig. 3 shows a plan view of an inner side of a cover of an electrical junction box according to one embodiment of the disclosure;

FIG. 4 shows a partial perspective cross-sectional view of the bottom of the electrical junction box taken along section line A-A in FIG. 1, wherein the direction of flow of water in the electrical junction box is schematically shown with dashed arrows;

FIG. 5 shows a partial side cross-sectional view taken along section line B-B in FIG. 4, with the direction of water flow in the electrical junction box schematically shown with dashed arrows;

fig. 6 shows a partially enlarged perspective view of the region C in fig. 2;

fig. 7 shows a partially enlarged front view of the region C;

fig. 8 shows a partially enlarged perspective view of the back of the region C;

fig. 9 shows a longitudinal central section of one snap-in structure of the electrical junction box;

fig. 10 shows an alternative connection of the cover to the body of the electrical junction box in a cross-sectional view.

Detailed Description

The following description is merely exemplary in nature and is in no way intended to limit the utility model, its application, or uses. It should be understood that throughout the drawings, like reference numerals refer to the same or like parts and features. The drawings are merely schematic representations, not necessarily showing the specific dimensions and proportions of the various embodiments of the utility model. Specific details or structures may be shown in exaggerated form in particular figures to illustrate related details or structures of embodiments of the utility model.

In describing embodiments of the present utility model, directional terms used in connection with "upper" and "lower" are described in terms of upper and lower positions of the views shown in the drawings. In practical use, the positional relationships of "upper" and "lower" used herein may be defined according to practical circumstances, and these relationships may be reversed. That is, in this application, the use of the azimuthal terms "upper," "lower," "top," "bottom," etc. are for ease of description and limitation only and should not be construed as limiting.

An electrical junction box 1 and a compressor 2 according to an embodiment of the present disclosure are first described with reference to fig. 1 to 9.

Fig. 1 shows a perspective view of a compressor 2 with an electrical junction box 1 according to one embodiment of the present disclosure; fig. 2 schematically shows an electronic device mounted in the electrical junction box 1; fig. 3 shows a plan view of an inner side of a cover of an electrical junction box according to one embodiment of the disclosure; fig. 4 shows a partial perspective sectional view of the bottom of the electrical junction box 1 taken along the sectional line A-A in fig. 1.

As shown in fig. 1 to 4, the electrical junction box 1 may include a body 10 and a cover 20 connected to the body 10. The body 10 has a box-like shape with one end open, and includes a back plate 11 and a side wall 12 extending around the edge of the back plate 11. The electrical junction box 1 is vertically mounted to the compressor 2 on the back plate 11 side. When the cover 20 is connected to the body 10, the cover 20 may cover the opening defined by the sidewall 12 and cooperate with the body 10 to define a substantially enclosed interior chamber 30. Various types of electronic components (e.g., a protection module for a compressor) in the electrical junction box 1 are preferably disposed at an upper portion of the interior chamber 30 to prevent water that may accumulate at a bottom of the interior chamber 30 from damaging the electronic components. Although the electrical junction box 1 shown in the drawings has a substantially pentagonal prism shape, the electrical junction box according to the present disclosure may have any other suitable shape.

Although the electric junction box 1 shown in the present disclosure is not limited to a cylindrical shape, hereinafter, for convenience of description, a direction of a central axis of the electric junction box 1 perpendicular to the back plate 11 of the body 10 is defined as an axial direction, a direction parallel to the back plate 11 of the body 10, which is radially outwardly extended centering on the central axis, is defined as a radial direction, and a direction extending around a periphery of the back plate 11 of the body 10 is defined as a circumferential direction.

As shown in conjunction with fig. 2 and 4, at the end 121 of the side wall 12 of the body 10, there is provided a radial annular projection 13 projecting radially outwardly from the outer surface 122 of the side wall 12, the radial annular projection 13 extending one revolution in the circumferential direction along the outer surface 122 of the side wall 12. At the end 121 of the side wall 12 of the body 10, there is also provided an axial annular projection 14 projecting axially outwardly from the end 121, the axial annular projection 14 extending one revolution in the circumferential direction along the end 121 of the side wall 12. The axial annular projection 14 is spaced from the inner surface 123 of the side wall 12 to form a step 15 at the edge of the inner surface 123 of the side wall 12.

As shown in fig. 3 and 4, the cover 20 includes a substantially flat plate-like portion 21 and a side wall 22 extending toward one side of the body 10 around an edge of the plate-like portion 21. As shown in fig. 4, the end 221 of the side wall 22 of the cover 20 is configured to abut the radial annular projection 13 of the body 10 in the assembled state. An annular boss 23 is provided on the radially inner side of the side wall 22 in parallel with and spaced apart from the side wall 22, and the space between the side wall 22 and the annular boss 23 forms a seal groove 24. In the assembled state, the axial annular projection 14 of the body 10 is received in the seal groove 24. The side wall 22 of the cover 20 and the axial annular projection 14 of the body 10 are provided longer, which is advantageous in preventing water from penetrating into the electrical junction box 1 along the slit gap between the side wall 22 and the axial annular projection 14. Seal 40 may also be disposed in seal groove 24. In the present embodiment, the seal 40 is an O-ring seal. In the assembled state, the axial annular projection 14 of the body 10 protrudes into the seal groove 24 and urges the seal 40 tightly against the cover 20. In the present embodiment, the length of the side wall 22 of the cover 20 protruding from the plate-like portion 21 is longer than the length of the annular boss 23 protruding from the plate-like portion 21, and the length of the annular boss 23 protruding from the plate-like portion 21 (i.e., the depth of the seal groove 24) is longer than the diameter or width of the seal 40 in the uncompressed state (i.e., the maximum dimension of the seal 40 in the axial direction of the electrical junction box), such as 1 to 5mm, to form a so-called "deep groove", so that, on the one hand, the seal 40 is prevented from escaping from the seal groove 24 and, on the other hand, the passage is lengthened to increase the flow resistance of external water into the electrical junction box.

As shown in fig. 4, in the assembled state, seal groove 24 receives only a portion of axial annular projection 14 of body 10. In other words, since the height of the annular boss 23 protruding from the plate-like portion 21 is smaller than the height of the side wall 22 protruding from the plate-like portion 21, when the side wall 22 of the cover 20 abuts against the radial annular protruding portion 13 of the body 10 in the assembled state, the annular boss 23 of the cover 20 is spaced apart from the stepped portion 15 of the body 10 so that a portion of the axial annular protruding portion 14 of the body 10 is exposed. Thereby, the annular boss 23 of the cover 20, the stepped portion 15 of the body 10 and the axial annular projection 14 of the body 10 together define the water-guiding groove 16. The water guide groove 16 extends around the inner chamber 30 of the electrical junction box 1 in the circumferential direction for one revolution and is in fluid communication with the drain passage 17 provided below the inner chamber 30 of the electrical junction box 1 so as to guide water in the electrical junction box 1 to the drain passage 17 to be drained. At the bottom of the body 10, the inner surface 123 of the side wall 12 (in particular the lower side wall) may be configured to be inclined such that the water trough 16 is in a lower position in order to guide water within the electrical junction box 1 into the water trough 16. The flow direction of the water of the electrical junction box 1 is schematically shown in fig. 4 with dashed arrows, and the water may flow under gravity into the water trough 16 along the inclined inner surface 123 of the side wall 12, and further along the water trough 16 into a drain channel 17, which will be described further below. In the present embodiment, the water guide groove 16 is defined by the body 10 and the cover 20 together, but it is also conceivable to form the water guide groove only by the body 10 or the cover 20.

As shown in fig. 4, the cover 20 may further include a flange 25 extending from the periphery of the end 221 of the sidewall 22 further toward the body 10 and surrounding the body 10. In particular, the flange 25 may extend around only a portion of the body 10. In this embodiment, in the assembled state, the flange 25 surrounds the radial annular projection 13 of the body 10 to block a portion of the external splash water from entering the electrical junction box 1. The flange 25 may be spaced from the radial annular projection 13 of the body 10 by a distance to facilitate draining water from the interior of the terminal block, as will be further described below. In some embodiments, the flange 25 may be brought into contact with or substantially free of clearance from the radial annular projection 13 of the body 10 on the upper and left and right sides of the junction box to facilitate preventing water from entering the junction box on the upper and left and right sides, while the flange 25 is spaced from the radial annular projection 13 of the body 10 on the lower side of the junction box by a distance (e.g., a gap of 1 to 1.5 mm) to facilitate increasing the dust storage space at the bottom of the junction box and preventing clogging of the drain passage.

As shown in connection with fig. 3 and 4, a ring of annular water-blocking grooves 26 may be provided between the end 221 of the side wall 22 of the cover 20 and the radial annular projection 13 of the body 10. In the present embodiment, the annular water blocking groove 26 is provided on the end 221 of the side wall 22 of the cover 20. In other embodiments, the annular water blocking groove may be provided on the radial annular protrusion 13 of the body 10, or on both the end 221 of the side wall 22 of the cover 20 and the radial annular protrusion 13 of the body 10. The annular water blocking groove 26 is located radially inward of the flange 25 of the cover 20 and radially outward of the inner chamber 30 of the electrical junction box 1, and thus can store water flowing in along the gap between the flange 25 of the cover 20 and the radial annular projection 13 of the body 10 and prevent such water from flowing into the inner chamber 30 of the electrical junction box 1. In addition, the water accumulation in the annular water blocking groove 26 may also form a water seal to prevent dust or debris from entering the interior chamber 30 of the electrical junction box 1. In the present embodiment, the annular water blocking groove 26 has a rectangular cross section (particularly, a square cross section), so that the annular water blocking groove 26 has a large water storage capacity. As shown in fig. 3, the top section 261 of the annular water baffle 26 at the top of the lid 20 is preferably configured to gradually decrease from the center to both sides so as to guide water to both sides and toward the bottom of the annular water baffle 26; the bottom section 262 of the annular water blocking groove 26 at the bottom of the cover 20 is preferably configured to gradually decrease from both sides to the center so as to guide water to drain through a drain passage provided at or near the bottom center of the annular water blocking groove 26. The top section 261 and the bottom section 262 of the annular water blocking groove 26 may be constructed of inclined straight sections or of arcuate sections. Furthermore, in some embodiments, a second sealing ring may be arranged in the water deflector groove to realize a so-called double sealing ring sealing structure.

Fig. 5 shows a partial side sectional view taken along section line B-B in fig. 4, in which the flow direction of water in the electrical junction box 1 is schematically shown with a dashed arrow. As shown in fig. 5, the body 10 and the cover 20 together define a drain passage 17 at the junction thereof. The drain channel 17 is preferably constructed as a labyrinth drain channel. The drain channel 17 may include an inlet section 171 in fluid communication with the interior chamber 30 of the electrical junction box 1 and an outlet section 172 in fluid communication with the exterior of the electrical junction box 1. In this embodiment, the inlet section 171 and the outlet section 172 collectively define a double "Z" shaped fluid flow path. A through hole 141 is provided in the axial annular projection 14 of the body 10. In the vicinity of the through hole 141, the step portion 15 defines a recess 151. As indicated by the dashed arrows in fig. 5, water on the sidewall 12 of the bottom of the body 10 flows vertically downwardly into the recess 151 and then flows laterally outwardly along the axial annular projection 14 and then vertically downwardly along the through bore 141, thereby defining a generally "Z" shaped fluid flow path in the inlet section 171. Subsequently, the water flows transversely along the side wall 22 of the cap 20 towards the radial annular projection 13 of the body 10 and vertically downwards along the vertical groove 131 on the radial annular projection 13 and through the annular water-blocking groove 26 and finally out along the water-draining groove 251 on the flange 25 of the cap 20, thereby also defining a substantially "zigzag" fluid flow path in the outlet section 172. The outlet section 172 of the drain channel 17 is in fluid communication with the annular water baffle 26, whereby the accumulated water in the annular water baffle 26 can be drained together.

The drain passage 17 is configured such that the fluid flow resistance experienced by the water flow in the inlet section 171 is smaller than the fluid flow resistance experienced by the water flow in the outlet section 172, and therefore, the difference in the fluid flow resistance in the inlet section 171 and the outlet section 172 causes the fluid to tend to flow from the inlet section 171 toward the outlet section 172 and impedes the reverse flow of the fluid from the outlet section 172 toward the inlet section 171. Under the combined action of gravity and the difference in fluid flow resistance between the inlet section 171 and the outlet section 172, water within the interior chamber 30 of the electrical junction box 1 can be smoothly discharged, and this arrangement can effectively prevent foreign substances such as water and dust from flowing back from the outlet section 172 into the interior chamber 30 of the electrical junction box 1. In the present embodiment, the difference in fluid flow resistance in the inlet section 171 and the outlet section 172 is achieved by setting the flow area (fluid flow cross-sectional area) of at least a portion of the inlet section 171 to be larger than the flow area of at least a portion of the outlet section 172. For example, as shown in fig. 5, the width w1 of the through-hole 141 constituting a part of the inlet section 171 is larger than the width w2 of the vertical groove 131 constituting a part of the outlet section 172, so that the flow area of the through-hole 141 is larger than the flow area of the vertical groove 131. For another example, the flow area of the entire portion of the inlet section 171 may be larger than the flow area of the entire portion of the outlet section 172, or the flow area of the portion of the inlet section 171 adjacent to the outlet section 172 may be larger than the flow area of the portion of the outlet section 172 adjacent to the inlet section 171. In other embodiments, the inlet section 171 may also have a fluid flow resistance that is less than the fluid flow resistance of the outlet section 172 by any other suitable means. For example, the inner surface of the outlet section 172 may be provided to be rougher than the inner surface of the inlet section 171, or a structure for increasing the fluid flow resistance such as a protrusion, a fin, or the like may be provided on the inner surface of the outlet section 172. Furthermore, it is also contemplated that only one of the inlet section 171 and the outlet section 172 may be configured as a labyrinth (e.g., generally "zig-zag"), or that the inlet section 171 and the outlet section 172 may be configured in other suitable forms. According to the present utility model, as long as the inlet section 171 and the outlet section 172 are configured such that the fluid flow resistance in the inlet section 171 is smaller than the fluid flow resistance in the outlet section 172, it is possible to obtain the basic technical effects of promoting drainage and suppressing water intake.

Fig. 6 shows a partially enlarged perspective view of a region C of the body 10 in fig. 2, fig. 7 shows a partially enlarged front view of the region C, and fig. 8 shows a partially enlarged perspective view of the rear surface of the region C.

As shown in fig. 7, the back plate 11 of the body 10 is provided with an air balance hole 111. The air balance hole 111 communicates the inner chamber 30 of the electrical junction box 1 with the external environment to balance the air pressure, so as to prevent negative pressure environment from forming in the inner chamber 30 to hinder the drainage of accumulated water. The diameter of the air balance hole 111 is preferably less than or equal to 1mm to satisfy the waterproof and dustproof grade requirements of the IP54 while achieving air balance. As shown in fig. 8, in order to further prevent external splash or foreign matter from entering the internal chamber 30 of the electrical junction box 1 via the air balance hole 111, the air balance hole 111 may be provided at a position as close as possible to the boss 112 located at the back surface of the back plate 11, and the boss 112 provided at the back surface of the back plate 11 may be used, for example, for fixing the body 10 to the housing of the compressor 2. In particular, as shown in fig. 8, the air balance hole 111 may be provided radially inward of one lower boss among the bosses of the back plate 11, whereby intrusion of external water and dust from the side of the electrical junction box 1 via the air balance hole 111 may be effectively blocked. Preferably, the air balance hole 111 is provided on the lower side of the back plate 11 and away from the electronic components arranged on the upper portion of the electrical junction box 1, more preferably, the air balance hole 111 is provided on the lower side of the back plate 11 and is offset to the left or right and the main electronic components (such as the protection module of the compressor) are provided on the upper side and is offset to the right or left, so that the air balance hole 111 is in a substantially diagonal relationship with the main electronic components so as to be further apart. Since the electrical junction box 1 is mounted to the compressor 2 on the side of the back plate 11, providing the air balance hole 111 on the back plate 11 of the body 10 can prevent as much as possible that external splash water enters the electrical junction box 1 through the air balance hole 111. In other embodiments, the air balance holes and bosses may be provided at other suitable locations, such as on the side wall 12 of the body 10 or on the cover 20 after appropriate additional waterproofing structures are employed.

In the present embodiment, the cover 20 is detachably connected to the body 10 by a snap structure, in such a way that the electrical junction box 1 can be easily and quickly detached. As shown in fig. 2 and 6 to 8, a plurality of snap mounts 18 for connection with the cover 20 are provided along the periphery of the side wall 12 of the body 10, the snap mounts 18 being of a generally rectangular frame structure and defining an opening 181. In this embodiment, the body 10 includes four snap mounts 18. Accordingly, as shown in fig. 3, four snaps 28 are provided along the periphery of the flange 25 of the cap 20. Fig. 9 shows a longitudinal central section of one snap-in structure of the electrical junction box 1. As shown in fig. 9, the inner surface of each snap mount 18 of the body 10 is provided with a projection 182 protruding radially inward toward the center of the opening 181. The side of the projection 182 facing the cover 20 may be provided with an inclined surface 183 to facilitate sliding of the guide catch 28 into the catch mount 18. The catch 28 of the cap 20 extends further towards the body 10 along the flange 25 of the cap 20 and comprises a radially outwardly protruding hook 281 at the end of the catch 28. The catch 28 may be elastically deformed to some extent. When the cover 20 is attached to the body 10, the hooks 281 of the catch 28 slide into the openings 181 along the inclined surfaces 183, over the protrusions 182 and snap into engagement with the protrusions 182. In the assembled state, an interference fit (e.g., an interference of 0.5 to 1 mm) may be formed between the hooks 281 of the snap 28 and the inner surface 184 of the snap mount 18 in the radial direction, while a small clearance fit (e.g., a clearance of less than 0.2 mm) may be formed between the hooks 281 of the snap 28 and the protrusions 182 of the snap mount 18 in the axial direction, thereby avoiding the lid of the electrical junction box from jumping up and down or left and right (in the radial direction) relative to the body and facilitating a tight fit of the body 10 and lid 20, i.e., a small clearance fit between the hooks 281 of the snap 28 and the protrusions 182 of the snap mount 18 such that: when the O-shaped sealing ring is not installed, the sealing installation surface can be in a fitting state, and after the O-shaped sealing ring is installed, the sealing installation surface is in a very small clearance fit state, so that the sealing effect of the sealing installation surface can be ensured even if the O-shaped sealing ring fails or is neglected to be installed. In some embodiments, the cap 20 (and in particular the clasp 28 of the cap 20) may be made of a material that contains a certain content of fiberglass.

In other embodiments, the cover of the electrical junction box may also be secured to the body in any other suitable manner. Fig. 10 shows an alternative connection of the cover 20' of the electrical junction box 1' to the body 10' in a sectional view. As shown in fig. 10, the cover 20' may be connected to the body 10' by a fastener 50 '. In this embodiment, the fastener 50' is a bolt.

In embodiments of the present disclosure, the body 10 and the cover 20 together define a drain channel 17 below the interior chamber 30 of the electrical junction box 1. Since the fluid flow resistance of the inlet section 171 of the drain passage 17 is set smaller than the fluid flow resistance of the outlet section 172 of the drain passage 17, water within the electrical junction box 1 can smoothly flow from the inlet section 171 of the drain passage 17 to the outlet section 172 and be discharged, and this arrangement can effectively prevent reverse inflow of water from the outlet section 172 of the drain passage 17 into the electrical junction box 1. On this basis, the drain passage 17 can be set to be large in size so as to smoothly drain water without impairing the waterproof and dustproof capabilities of the electrical junction box.

The embodiments of the present disclosure further improve the waterproof and dustproof structure of the electrical junction box 1. The flange 25 on the cover 20 can block most of foreign matters such as water and dust from entering the electrical junction box 1. A ring of annular water blocking grooves 26 provided outside the inner chamber 30 of the electrical junction box 1 can store water flowing in from the gap of the flange 25 and form a water seal. The elongated gap between the side wall 22 of the cap 20 and the axial annular projection 14 of the body 10, and the seal 40 tightly urged by the axial annular projection 14, acts a further waterproof function. If there is still water penetrating into the interior chamber 30 of the electrical junction box 1 or condensate water is generated within the interior chamber 30 of the electrical junction box 1, this portion of the water will be directed through the water trough 16 to the inlet section 171 of the drain channel 17 and discharged via the outlet section 172 of the drain channel 17. Tests have shown that the electrical junction box 1 according to the present disclosure can meet the IP54 waterproof and dustproof grade requirements even without the installation of the seal 40.

Here, exemplary embodiments of the electric junction box and the compressor according to the present utility model have been described in detail, but it should be understood that the present utility model is not limited to the specific embodiments described and illustrated in detail above. Those skilled in the art will be able to make various modifications and variations to the utility model without departing from the spirit and scope of the utility model. All such modifications and variations are intended to be within the scope of the present utility model. Moreover, all the components described herein may be replaced by other technically equivalent elements.

Claims (20)

1. An electrical junction box comprising a body and a cover connected to the body, the body and the cover configured to collectively define an interior chamber,

it is characterized in that the method comprises the steps of,

the cover and the body are configured to collectively define a drain channel below the interior chamber, the drain channel including an inlet section in fluid communication with the interior chamber and an outlet section in fluid communication with the exterior of the electrical junction box, the drain channel configured such that a fluid flow resistance in the inlet section is less than a fluid flow resistance in the outlet section.

2. The electrical junction box of claim 1 wherein at least a portion of said inlet section has a flow area greater than a flow area of at least a portion of said outlet section.

3. The electrical junction box of claim 1 wherein:

the drain passage is constructed in a labyrinth type,

the inlet section defines a "Z" shaped fluid flow path and/or the outlet section defines another "Z" shaped fluid flow path.

4. An electrical junction box according to any one of claims 1 to 3 wherein in the interior chamber the body and/or the cover define a water trough in fluid communication with the inlet section of the drain channel, the water trough being configured to direct water in the interior chamber of the electrical junction box to the inlet section of the drain channel.

5. The electrical junction box of claim 4 wherein said water trough extends one revolution in a circumferential direction of said electrical junction box around said interior chamber of said electrical junction box.

6. An electrical junction box according to any one of claims 1 to 3, wherein the body is provided with an air balance hole.

7. The electrical junction box of claim 6 wherein said air balance holes are disposed on an underside of said body back plate and away from electronics in said electrical junction box.

8. The electrical junction box according to claim 7, wherein a boss is provided on a back surface of the back plate, and the air balance hole is provided adjacently on a radially inner side of the boss.

9. The electrical junction box according to claim 6, wherein the diameter of the air balance hole is less than or equal to 1mm.

10. An electrical junction box according to any one of claims 1 to 3, wherein the body and/or the cover comprises an annular water-blocking groove arranged between the body and the cover, the annular water-blocking groove being disposed radially outside the inner chamber around the inner chamber.

11. The electrical junction box of claim 10 wherein said annular water blocking channel is in fluid communication with said outlet section of said drain channel.

12. The electrical junction box according to claim 10, wherein a top section of the annular water baffle slot is configured to gradually decrease from the center to the sides and/or a bottom section of the annular water baffle slot is configured to gradually decrease from the sides to the center.

13. An electrical junction box according to any one of claims 1 to 3, wherein a flange surrounding the body is provided at the periphery of the cover.

14. An electrical junction box according to any one of claims 1 to 3, wherein the body is provided with an axial annular projection projecting in an axial direction of the electrical junction box, and the cover is provided with a seal groove for receiving the axial annular projection.

15. The electrical junction box of claim 14 wherein a seal is disposed in the seal groove, the axial annular projection of the body urging the seal against the cover in an assembled state.

16. The electrical junction box of claim 15 wherein a depth of said seal groove is greater than a dimension of said seal in said axial direction of said electrical junction box in an uncompressed state.

17. An electrical junction box according to any one of claims 1 to 3 wherein the cover is connected to the body by a snap-fit arrangement.

18. The electrical junction box of claim 17 wherein said body includes a snap mount and said cover includes a snap, said snap and said snap mount being interference fit in a radial direction of said electrical junction box and clearance fit in an axial direction of said electrical junction box in an assembled state.

19. An electrical junction box according to any one of claims 1 to 3 wherein the cover is connected to the body by fasteners.

20. A compressor, characterized in that it comprises an electrical junction box according to any one of claims 1 to 19.