Cryogenic compressor and its junction box

Abstract

The utility model discloses a low-temperature compressor and a junction box thereof, which involves the installation of cables or wires, and solves the problem that the inner wall of the existing junction box is prone to condensation to form water droplets, which in turn causes the protection module to malfunction or even burn out. The technical solution adopted by the utility model is: a low-temperature compressor junction box, including an outer box body, an inner box body located inside the outer box body, and a box cover, the inner cavity of the inner box body is divided into a first space and a second space that are independent of each other, the inner box body and the outer box body are respectively provided with notches for installing wiring terminals, the inner box body is provided with a mounting structure for installing the protection module, and the notch and the mounting structure of the inner box body are respectively located in the first space and the second space. The protection module is in the enclosed second space, which not only prevents the entry of external air containing water vapor, but also prevents condensation in the second space to form water droplets. The utility model is used to reduce the risk of condensed water inside the junction box and improve the reliability of the protection module in the junction box.

Description

Technical Field

[0001] The utility model relates to the installation of cables or wires, in particular to a low-temperature compressor junction box and a compressor with the junction box. Background Art

[0002] The compressor protection module is an electronic component used to protect the compressor. When the compressor encounters abnormal conditions such as overload, low voltage, overheating, etc., the protection module can stop the supply of current in time to prevent the compressor from being damaged. The existing low-temperature compressor junction box includes a box body and a box cover. The box body is fixedly installed on the outer wall of the cylinder body of the low-temperature compressor. The wiring terminals and the protection module are fixedly installed in the box body. The box cover is tightly fastened to the box body. A sealing ring is also arranged between the box body and the box cover, and the sealing ring plays a waterproof role. When the low-temperature compressor is working, the cylinder body will heat up, and the temperature of the air in the junction box will rise accordingly. Since the air outside the junction box is relatively cold air, the temperature of the junction box is lower than the temperature of the air in the junction box. The water vapor in the air in the junction box will condense to form water droplets and adhere to the inner wall of the junction box. The water droplets may enter the protection module, causing the protection module to malfunction or even burn. Utility Model Content

[0003] The utility model firstly provides a low-temperature compressor junction box, which solves the problem that the inner wall of the existing junction box is prone to condensation to form water droplets, thereby causing the protection module to malfunction or even burn out.

[0004] The technical solution adopted by the utility model is: a low-temperature compressor junction box, comprising an outer box body, an inner box body located inside the outer box body, and a box cover that closes the second space of the outer box body and the inner box body, a partition is provided inside the inner box body, and the inner cavity of the inner box body is divided into a first space and a second space that are independent of each other by the partition, the partition is provided with at least one threading hole that connects the first space and the second space, the inner box body is provided with a notch for installing a wiring terminal, the notch of the inner box body is located in the first space, the outer box body is provided with a notch for installing a wiring terminal, the notch of the outer box body corresponds to the notch of the inner box body, and the inner box body is provided with a mounting structure for installing a protection module, and the mounting structure is located in the second space.

[0005] In order to facilitate the screw for fixing the low-temperature compressor terminal box to the outer wall of the cylinder body of the low-temperature compressor, further: the outer box body is provided with at least two mounting holes, the inner box body is provided with at least two mounting holes, the mounting holes of the inner box body are located in the first space, and the mounting holes of the outer box body and the mounting holes of the inner box body are both through holes and correspond one to one.

[0006] In order to improve the heat insulation effect of the box cover, further: a heat preservation layer is fixedly provided on the inner side of the box cover, or a heat preservation pad is provided between the outer box body, the inner box body and the box cover.

[0007] In order to improve the airtightness between the outer box body and the box cover, further: at least one of the outer box body and the box cover is provided with an annular groove, and a sealing ring is provided in the groove.

[0008] The installation structure in the second space of the inner box body is used to install the protection module, and the protection module is generally installed by bolts. Specifically: at least two connecting members are fixedly set in the second space of the inner box body, and the connecting members are provided with threaded holes; or, the inner box body is provided with at least two threaded holes in the second space.

[0009] In order to improve the heat insulation effect of the inner box body, further: the inner box body is made of foamed heat-insulating material.

[0010] Since the foamed heat-insulating material itself has poor strength, in order to ensure the stability of the inner box body, further: the outer wall of the inner box body and the inner wall of the outer box body are in contact with each other, and the inner box body is fixed to the inner wall of the outer box body.

[0011] Since the strength of the foam insulation material itself is relatively poor, in order to ensure the stability of the protection module when it is directly installed on the inner box body by bolts, further: at least two blind holes are arranged in the second space of the inner box body, and a connecting piece is fixedly arranged in the blind hole, the connecting piece is cylindrical, the inner wall of the cylinder is provided with an internal thread, and the outer wall of the cylinder is serrated; a bushing is fixedly arranged in the mounting hole of the inner box body, the middle part of the bushing is a through hole, and the outer wall of the bushing is serrated.

[0012] The beneficial effects of the utility model are as follows: the protection module is installed in the installation structure of the second space of the inner box body, and the box cover closes the second space of the outer box body, so that the protection module is in a closed environment, and the external air containing water vapor is prevented from entering the second space. At the same time, the inner box body has a heat insulation effect, which can reduce the temperature difference between the air temperature in the second space and the inner box body, and try to avoid the water vapor in the air in the second space condensing to form water droplets. The utility model significantly reduces the risk of condensed water inside the junction box, and can improve the reliability of the protection module.

[0013] The utility model also provides a low-temperature compressor to solve the problem that the inner wall of the junction box of the low-temperature compressor is prone to condensation to form water droplets, which in turn causes the protection module to malfunction or even burn out. The technical solution adopted is: the low-temperature compressor includes a cylinder body and a junction box fixedly installed on the outer wall of the cylinder body, the junction box is any one of the above-mentioned low-temperature compressor junction boxes, and wiring terminals are installed at the notch of the outer box body and the notch of the inner box body, the protection module is installed in the second space of the inner box body, and the cable of the protection module is connected to the first space through the wire threading hole of the partition.

[0014] The following is a solution for fixing the junction box to the cylinder body. Specifically: at least two screws are fixedly arranged on the outer wall of the cylinder body, and adjustment nuts are arranged outside the screws. The screws pass through the mounting holes of the outer box body and the mounting holes of the inner box body, and are fixed by adjusting nuts and locking nuts.

[0015] The beneficial effect of the low-temperature compressor of the utility model is that the protection module in the junction box of the low-temperature compressor will not fail due to water ingress, thereby ensuring that the protection module effectively protects the low-temperature compressor and ensuring the safety of the low-temperature compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of an embodiment of the low-temperature compressor of the utility model when the box cover is opened.

[0017] Figure 2 yes Figure 1 Exploded view of the illustrated embodiment.

[0018] Figure 3 yes Figure 1 A schematic cross-sectional view of the embodiment shown at the connection terminal location.

[0019] Figure 4 yes Figure 1 A schematic structural diagram of the inner box body in the illustrated embodiment.

[0020] Figure 5 yes Figure 4 Exploded diagram.

[0021] Figure numerals: outer box body 1, notch 11 of outer box body, mounting hole 12 of outer box body, inner box body 2, partition 21, threading hole 22, notch 23 of inner box body, mounting hole 24 of inner box body, connector 25, bushing 26, box cover 3, wiring terminal 4, protection module 5, insulation pad 6, sealing ring 7, cylinder body 8, screw 91, adjusting nut 92. DETAILED DESCRIPTION

[0022] The utility model will be further described below in conjunction with the accompanying drawings.

[0023] The first subject of the utility model is a low temperature compressor terminal box. Figures 1 to 5 The low temperature compressor junction box includes an outer box body 1, an inner box body 2 located inside the outer box body 1, and a box cover 3 that closes the second space of the outer box body 1 and the inner box body 2. The outer box body 1 is made of a hard material, generally a hard plastic. The outer box body 1 and the inner box body 2 can be in any shape, for example, the outer box body 1 and the inner box body 2 are in a rectangular shape. The inner box body 2 is fixedly installed inside the outer box body 1, for example, the outer wall of the inner box body 2 and the inner wall of the outer box body 1 are attached to each other and fixed by bonding.

[0024] The low-temperature compressor junction box needs to be fixedly installed on the low-temperature compressor cylinder body 8. When the screw 91 is fixedly set on the outer wall of the cylinder body 8 of the low-temperature compressor, in order to facilitate the fixed installation of the low-temperature compressor junction box on the cylinder body 8, the outer box body 1 is provided with at least two mounting holes 12, and the screw 91 penetrates the mounting hole 12 to fix the outer box body 1 to the cylinder body 8, and the inner box body 2 is fixedly installed inside the outer box body 1, thereby realizing the installation of the low-temperature compressor junction box. Alternatively, the outer box body 1 is provided with at least two mounting holes 12, and the inner box body 2 is provided with at least two mounting holes 24, and the mounting holes 24 of the inner box body 2 are located in the first space, and the mounting holes 12 of the outer box body 1 and the mounting holes 24 of the inner box body 2 are both through holes and correspond one to one, and the screw 91 penetrates the mounting holes 12 of the outer box body 1 and the mounting holes 24 of the inner box body 2 at the same time, thereby fixing the outer box body 1 and the inner box body 2 to the cylinder body 8 at the same time. For example, in Figure 1 In the illustrated embodiment, the outer box body 1 is provided with three mounting holes 12, and the inner box body 2 is provided with three mounting holes 24. When the inner box body 2 is a foamed heat-insulating material with poor self-strength, a bushing 26 can be fixedly provided in the mounting hole 24 of the inner box body 2, and the middle part of the bushing 26 is a through hole to improve the strength of the mounting hole 24. The outer wall of the bushing 26 is tooth-shaped, so that the bushing 26 can be fixed to the inner box body 2 more firmly.

[0025] A partition 21 is provided inside the inner box body 2, and the inner cavity of the inner box body 2 is divided into a first space and a second space that are independent of each other by the partition 21. The first space is used to install the wiring terminal 4, and the second space is used to install the protection module 5. The partition 21 is provided with at least one threading hole 22 that connects the first space and the second space, and the threading hole 22 is used to connect the cable of the protection module 5 to the first space. It is best to have one threading hole 22, and the aperture is as small as possible to prevent water vapor from entering the second space through the threading hole 22. The outer box body 1 and the inner box body 2 are also respectively provided with wiring holes for connecting cables. The wiring holes of the outer box body 1 and the wiring holes of the inner box body 2 overlap with each other and are directly connected to the second space of the inner box body 2.

[0026] The inner box body 2 is provided with a notch 23 for installing the wiring terminal 4, and the notch 23 of the inner box body 2 is located in the first space. The outer box body 1 is also provided with a notch 11 for installing the wiring terminal 4, and the notch 11 of the outer box body 1 corresponds to the notch 23 of the inner box body 2. The notch 11 of the outer box body 1 and the notch 23 of the inner box body 2 overlap with each other, and both are through notches for arranging the wiring terminal 4.

[0027] The inner box body 2 is provided with a mounting structure in the second space, and the mounting structure is used to install the protection module 5. The protection module 5 is generally installed by bolts, so the mounting structure can be a threaded hole directly set in the inner box body 2, or the mounting structure is a connector 25, the connector 25 is provided with a threaded hole, and the connector 25 is fixedly installed in the second space of the inner box body 2. In order to ensure the stability of the low-temperature compressor terminal box, at least two connectors 25 are fixedly provided in the second space of the inner box body 2, and the connector 25 is provided with a threaded hole; or, the inner box body 2 is provided with at least two threaded holes in the second space.

[0028] After the box cover 3 is buckled onto the outer box body 1, the entire inner cavity of the outer box body 1 is closed, and the box cover 3 simultaneously closes the second space of the inner box body 2. In order to improve the heat insulation effect of the box cover 3, a heat preservation layer is fixedly provided on the inner side of the box cover 3, and the heat preservation layer is fixed on the inner side of the box cover 3, or a heat preservation pad 6 is arranged between the outer box body 1 and the inner box body 2 and the box cover 3. In order to improve the airtightness between the outer box body 1 and the box cover 3, a sealing ring 7 is also arranged between the outer box body 1 and the box cover 3, and the sealing ring 7 plays a waterproof role. The sealing ring 7 is generally one, and can also be multiple. In order to facilitate the fixing of the sealing ring 7, at least one of the outer box body 1 and the box cover 3 is provided with an annular card groove, and the sealing ring 7 is located in the card groove.

[0029] The inner box body 2 is preferably made of heat-insulating material, such as foamed heat-insulating material, to reduce the temperature difference between the temperature of the inner box body 2 and the air temperature in the second space. The inner box body 2 can be made of foam material. Since the strength of the foamed heat-insulating material itself is relatively poor, in order to ensure the stability of the inner box body 2, the outer wall of the inner box body 2 and the inner wall of the outer box body 1 are fitted together, and the inner box body 2 is fixed to the inner wall of the outer box body 1, such as by bonding. The inner box body 2 is a foamed heat-insulating material with relatively poor strength itself. In order to ensure the stability of the protection module 5 after being installed in the inner box body 2 by bolts, the inner box body 2 is provided with at least two holes in the second space. The holes are preferably blind holes to ensure the airtightness of the second space. A connector 25 is fixed in the hole. The connector 25 is provided with a threaded hole and is used for threaded connection with the bolt. See. Figure 5 The connecting piece 25 is cylindrical, the inner wall of the cylinder is provided with an internal thread, and the outer wall of the cylinder is toothed, so that the connecting piece 25 can be fixed to the inner box body 2 more stably.

[0030] The second subject of the present invention is a low temperature compressor. Figures 1 to 5As shown, the low-temperature compressor includes a cylinder body 8 and a junction box fixedly mounted on the outer wall of the cylinder body 8. The junction box is the low-temperature compressor junction box described in the first subject above, and the notch 11 of the outer box body 1 and the notch 23 of the inner box body 2 are installed with wiring terminals 4. A protection module 5 is installed in the second space of the inner box body 2, and the cable of the protection module 5 is connected to the first space through the threading hole 22 of the partition 21. At least two screws 91 are fixedly arranged on the outer wall of the cylinder body 8, and an adjusting nut 92 is arranged on the outside of the screw 91. The screw 91 passes through the mounting hole 12 of the outer box body 1 and the mounting hole 24 of the inner box body 2, and is fixed by the adjusting nut 92 and the locking nut. The position of the adjusting nut 92 and the locking nut is adjustable, and the distance of the outer box body 1 relative to the cylinder body 8 can be adjusted to separate the outer box body 1 from the cylinder body 8.

Claims

1. A low temperature compressor junction box, characterized in that: The invention comprises an outer box body (1), an inner box body (2) located inside the outer box body (1), and a box cover (3) which seals the second space of the outer box body (1) and the inner box body (2); a partition (21) is provided inside the inner box body (2); the inner cavity of the inner box body (2) is divided into a first space and a second space which are independent of each other by the partition (21); the partition (21) is provided with at least one threading hole (22) which connects the first space and the second space; the inner box body (2) is provided with a notch (23) for installing a wiring terminal (4); the notch (23) of the inner box body (2) is located in the first space; the outer box body (1) is provided with a notch (11) for installing a wiring terminal (4); the notch (11) of the outer box body (1) corresponds to the notch (23) of the inner box body (2); the inner box body (2) is provided with a mounting structure for installing a protection module (5); the mounting structure is located in the second space.

2. The low temperature compressor terminal box according to claim 1, characterized in that: The outer box body (1) is provided with at least two mounting holes (12), and the inner box body (2) is provided with at least two mounting holes (24); the mounting holes (24) of the inner box body (2) are located in the first space; the mounting holes (12) of the outer box body (1) and the mounting holes (24) of the inner box body (2) are both through holes and correspond one to one.

3. The low temperature compressor terminal box according to claim 1, characterized in that: A heat-insulating layer is fixedly provided on the inner side of the box cover (3), or a heat-insulating pad (6) is provided between the outer box body (1), the inner box body (2) and the box cover (3).

4. The low temperature compressor terminal box according to claim 1, characterized in that: At least one of the outer box body (1) and the box cover (3) is provided with an annular clamping groove, and a sealing ring (7) is provided in the clamping groove.

5. The low temperature compressor terminal box according to claim 1, characterized in that: At least two connecting members (25) are fixedly arranged in the second space of the inner box body (2), and the connecting members (25) are provided with threaded holes; or, at least two threaded holes are provided in the second space of the inner box body (2).

6. The low temperature compressor terminal box according to any one of claims 1 to 5, characterized in that: The inner box body (2) is made of foamed heat-insulating material.

7. The low temperature compressor terminal box according to claim 6, characterized in that: The outer wall of the inner box body (2) and the inner wall of the outer box body (1) are in contact with each other, and the inner box body (2) is fixed to the inner wall of the outer box body (1).

8. The low temperature compressor terminal box according to claim 6, characterized in that: The inner box body (2) is provided with at least two blind holes in the second space, and a connecting piece (25) is fixedly arranged in the blind hole, the connecting piece (25) is cylindrical, the inner wall of the cylinder is provided with an internal thread, and the outer wall of the cylinder is toothed; a bushing (26) is fixedly arranged in the mounting hole (24) of the inner box body (2), the middle part of the bushing (26) is a through hole, and the outer wall of the bushing (26) is toothed.

9. A low temperature compressor, comprising a cylinder (8) and a terminal box fixedly mounted on the outer wall of the cylinder (8), characterized in that: The junction box is a low-temperature compressor junction box as described in any one of claims 1 to 8 above, and wiring terminals (4) are installed at the notch (11) of the outer box body (1) and the notch (23) of the inner box body (2), a protection module (5) is installed in the second space of the inner box body (2), and the cable of the protection module (5) is connected to the first space through the wire hole (22) of the partition (21).

10. The cryogenic compressor according to claim 9, characterized in that: At least two screw rods (91) are fixedly arranged on the outer wall of the cylinder body (8), and an adjusting nut (92) is arranged outside the screw rod (91). The screw rod (91) penetrates into the mounting hole (12) of the outer box body (1) and the mounting hole (24) of the inner box body (2), and is fixed by the adjusting nut (92) and the locking nut.

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