CN217009739U

CN217009739U - Low-voltage cabinet copper bar and current sensor's clamping device

Info

Publication number: CN217009739U
Application number: CN202122769334.3U
Authority: CN
Inventors: 唐银春
Original assignee: Shanghai Xinying Powertech Co ltd
Current assignee: Shanghai Xinying Powertech Co ltd
Priority date: 2021-11-12
Filing date: 2021-11-12
Publication date: 2022-07-19
Anticipated expiration: 2031-11-12

Abstract

The utility model relates to a clamping device for a copper bar and a current sensor of a low-voltage cabinet, which is used for clamping and fixing the copper bar (1) and the current sensor (2) of the low-voltage cabinet in a transformer sound level vibration monitoring system, wherein the current sensor (2) is sleeved on the copper bar (1), the clamping device comprises two groups of mounting pieces arranged on the copper bar (1), the two groups of mounting pieces are respectively arranged at the top and the bottom of the current sensor (2), the current sensor (2) is clamped on the copper bar (1) through a fastening piece (4), and the fastening piece (4) comprises a screw rod, a nut and a guide positioning bush sleeved outside the screw rod. Compared with the prior art, the clamping device has the advantages of convenience in operation, rapidness in clamping, simple structure and the like.

Description

Clamping device for copper bar and current sensor of low-voltage cabinet

Technical Field

The utility model relates to the technical field of transformers, in particular to a clamping device for a low-voltage cabinet copper bar and a current sensor.

Background

The sensor has a wide measuring range in a monitoring system, is a device for converting various physical quantities into physical quantities of another size and form for output so as to facilitate observation, measurement or processing, and is a device for converting various forms of electric quantities into standard electric quantities for output. In a transformer sound level vibration monitoring system, a current sensor is commonly used. The standard electrical quantity output by a current sensor (such as a commonly used hall current sensor) is generally: a standard DC current signal of 4-20 mA or 0-20 mA and a standard DC or AC voltage signal of 0-5V. By combining hardware technology and signal processing, aiming at the online monitoring device of the transformer, the defects of the transformer which occur or will occur are predicted and judged in advance through data analysis by acquiring signals such as vibration, noise, zero sequence current and the like in the running process of the transformer in real time, and the corresponding warning signal is given out for warning in advance.

The existing connection structure of the low-voltage side of the power transformer usually adopts a low-voltage coil appearance head and a lug connected with a low-voltage sleeve, at the moment, a low-voltage coil outlet head is connected with the lug by using an outgoing line, and the outgoing line adopts a copper bar. In a transformer sound level vibration monitoring system, a commonly used current sensor is shown in fig. 1, and a mounting hole for being sleeved on a copper bar is formed in the center of the current sensor. The current sensor is usually installed on the copper bar of the low-voltage cabinet of the transformer through the installation hole, and the copper bar is arranged at the center of the transformer, so that the stable installation of the current sensor and the copper bar is very important. However, the periphery of the current transformer has no other space for providing a fulcrum for installing an additional clamping device, and has no other fixing surface for assisting the copper bar and the current sensor to realize clamping. Although some solutions in the prior art adopt a plurality of lugs and mounting plates to fix the copper bar, the way does not realize the clamping and fixing of the current sensor on the copper bar, and the clamping state cannot be kept.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a clamping device for a low-voltage cabinet copper bar and a current sensor, which aims to overcome the defects in the prior art.

The purpose of the utility model can be realized by the following technical scheme:

the utility model provides a clamping device of low-voltage cabinet copper bar and current sensor for press from both sides between the copper bar of low-voltage cabinet and the current sensor in the transformer sound level vibration monitoring system and press from both sides tightly fixedly, the current sensor cover is established on the copper bar, the device is including locating two sets of installed parts on the copper bar, two sets of installed parts are located respectively current sensor top and bottom to press from both sides current sensor tightly on the copper bar through the fastener, the fastener includes screw rod, nut and cover and establishes the guide orientation bush outside the screw rod.

Preferably, each group the installed part includes two mounting panels that size, structure are the same respectively, and two mounting panels correspond the setting respectively and are in the front side and the rear side of copper bar, and the both ends of every mounting panel are passed through respectively the fastener is connected.

Preferably, the fastener includes screw rod, nut, first insulation direction location bush and the insulation direction location bush of second, and when the installation, first insulation direction location bush and the insulation direction location bush cover are established at the screw rod outside, and the both ends symmetry of every mounting panel is equipped with the bush mounting hole that is used for with first insulation direction location bush, the insulation direction location bush interference fit of second, and one side that every mounting panel is close to the contact surface of copper bar is equipped with the plane recess of inside concave yield.

Preferably, the first insulation guide positioning bushing is in interference fit with a bushing mounting hole of a mounting plate located on the front side of the copper bar, and the second insulation guide positioning bushing is in interference fit with a bushing mounting hole of a mounting plate located on the rear side of the copper bar.

Preferably, the first insulation guide positioning bush comprises a first cylindrical hollow bush body and a first disc-shaped outer convex part, the first cylindrical hollow bush body is connected with the first cylindrical hollow bush body, the first disc-shaped outer convex part is arranged at one end of the first cylindrical hollow bush body, a first through hole for inserting a screw rod is formed in the center of the first disc-shaped outer convex part, and the first cylindrical hollow bush body is in interference fit with the bush mounting hole.

Preferably, the inner diameter of the first cylindrical hollow sleeve body is larger than the outer diameter of the screw rod, and the outer diameter of the first disc-shaped outer convex part is larger than the aperture of the bushing mounting hole.

Preferably, the second insulation guide positioning bush comprises a second cylindrical hollow bush body and a second disc-shaped outer convex part, the second cylindrical hollow bush body is connected with the second cylindrical hollow bush body, the second disc-shaped outer convex part is arranged at one end of the second cylindrical hollow bush body, a second through hole for inserting the screw rod is formed in the center of the second disc-shaped outer convex part, and the second cylindrical hollow bush body is in interference fit with the bush mounting hole.

Preferably, the inner diameter of the second cylindrical hollow sleeve body is equal to the outer diameter of the screw, and the outer diameter of the second disc-shaped convex part is larger than the aperture of the bushing mounting hole.

Preferably, the first insulation guide positioning bushing and the second insulation guide positioning bushing both adopt phenolic resin wear-resistant bushings.

Preferably, the screw is an SUS304 stainless steel screw, and the nut is an SUS304 stainless steel nut.

Compared with the prior art, the utility model has the following beneficial effects:

1) the device can utilize the manpower action to lead the screw rod to do a linear motion back and forth by the mechanical mechanism, and the linear motion is converted from a rotary motion to a linear motion, thereby achieving the purposes of free expansion and contraction and distance adjustment in a certain range, simultaneously embedding the guiding and positioning bush in the mounting plate for convenient use, fixing a clamped object (such as a current sensor) at any position of a copper bar for clamping without wandering, and effectively fixing and clamping the clamped object at any position of a transformer central point copper bar Hall current sensor.

2) The device has the advantages of convenient operation, rapid clamping, simple structure, easy manufacture and cost saving.

3) The device can realize self-locking through the matching of the mounting plate, the screw rod, the bolt and the guide positioning bushing, and can still keep the clamping state of the workpiece even after the original force is removed.

4) Safe operation, low labor intensity, beautiful appearance and convenient maintenance and installation.

Drawings

FIG. 1 is a schematic diagram of an external structure of a current sensor commonly used in a sound level vibration monitoring system of a transformer;

FIG. 2 is a schematic structural diagram of the embodiment after the copper bar of the low-voltage cabinet and the clamping device of the current sensor are completely installed;

FIG. 3 is a schematic structural diagram of the clamping device for the low-voltage cabinet copper bar and the current sensor before installation in the embodiment;

FIG. 4 is a schematic structural view of a mounting plate in the embodiment;

FIG. 5 is a schematic view of a first insulation guide positioning bushing in an embodiment;

FIG. 6 is a schematic view of the first insulation guide positioning bushing at another angle in the embodiment;

FIG. 7 is a schematic view of a second insulation guide positioning bushing according to an embodiment;

FIG. 8 is a schematic view of the insulation guide positioning bushing of the first drawing in another angle of the embodiment;

the reference numbers in the figures indicate:

1. copper bar, 2, current sensor, 201, copper bar mounting hole, 3, mounting panel, 301, plane recess, 302, bush mounting hole, 4, first insulating direction location bush, 401, the first cylindrical hollow cover body, 402, the first disc-shaped outer convex part, 403, first through-hole, 5, the second insulating direction location bush, 501, the second cylindrical hollow cover body, 502, the second disc-shaped outer convex part, 503, the second through-hole.

Detailed Description

The utility model is described in detail below with reference to the figures and specific embodiments. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, shall fall within the protection scope of the present invention.

Examples

The utility model relates to a clamping device for a copper bar and a current sensor of a low-voltage cabinet, which is suitable for fixing the copper bar and the common current sensor of the low-voltage cabinet in a sound level vibration monitoring system of a transformer. The copper bar 1 is a rectangular structure, and the section of the copper bar is rectangular. The main structure of the current sensor is shown in fig. 1, a copper bar mounting hole 201 is formed in the center of the current sensor, and the structure and the size of the copper bar mounting hole 201 are the same as those of the cross-sectional structure and the size of the copper bar 1. A commonly used current sensor is a hall current sensor.

As shown in fig. 2 and 3, the clamping device of the utility model comprises two sets of mounting pieces arranged on the copper bar 1, the current sensor 2 is mounted on the copper bar 1 through a mounting hole, and stable clamping on the copper bar 1 is realized through the two sets of mounting pieces.

The two sets of mounts include a top mount disposed on top of the current sensor 2 and a bottom mount disposed on the bottom of the current sensor 2. Each group of installation parts respectively comprises two installation plates 3 which are correspondingly arranged, and the size and the structure of the two installation plates 3 are completely the same and correspondingly arranged. The length of each mounting plate 3 is not less than the length of the current sensor 2. Two mounting panels 3 correspond the setting respectively in the front side and the rear side of copper bar 1, and the both ends of every mounting panel 3 are equipped with respectively and are used for realizing fixed fastener with two mounting panels 3.

As shown in fig. 4, the mounting plate 3 is a rectangular plate, and one side of the mounting plate close to the contact surface of the copper bar 1 is provided with a planar groove 301 which is recessed inwards, and the width of the planar groove 301 is the same as the width of the contact surface of the copper bar 1. In each set of mounting members, bushing mounting holes 302 are symmetrically formed through the mounting plates 3 at both ends of each mounting plate 3.

The fastener comprises a nut, a screw, a first insulation guide positioning bush 4 and a second insulation guide positioning bush 5. The first insulation guide positioning bush 4 and the second insulation guide positioning bush 5 are in interference fit with the bush mounting hole 302 of the front mounting plate 3 and the bush mounting hole 302 of the rear mounting plate 3 respectively.

As shown in fig. 5 and 6, the first insulation guide positioning bushing 4 includes a first cylindrical hollow sleeve 401 and a first disc-shaped convex portion 402 disposed at one end of the first cylindrical hollow sleeve 401. The center of the first disc-shaped convex portion 402 is provided with a first through hole 403 into which the screw is inserted.

The first cylindrical hollow sleeve 401 is used for interference fit with the bushing mounting hole 302, so that the first insulation guide positioning bushing 4 is embedded into the mounting plate 3. The inside of the first cylindrical hollow sleeve body 401 is used for installing a screw rod, and the inner diameter of the first cylindrical hollow sleeve body 401 is larger than the outer diameter of the screw rod. The outer diameter of the first disc-shaped outer protrusion 402 is larger than the bore diameter of the bushing mounting hole 302.

As shown in fig. 7 and 8, the second insulation guide positioning bushing 5 includes a second cylindrical hollow sleeve 501 and a second disc-shaped convex portion 502 disposed at one end of the second cylindrical hollow sleeve 501. The second disc-shaped protruding portion 502 has a second through hole 503 at the center thereof into which a screw is inserted. The second cylindrical hollow sleeve body 501 is used for interference fit with the bushing mounting hole 302, so that the second insulation guide positioning bushing 5 is embedded into the mounting plate 3. The inside of the second cylindrical hollow sleeve body 501 is used for installing a screw, and the inner diameter of the second cylindrical hollow sleeve body 501 is equal to the outer diameter of the screw. The outer diameter of the second disc-shaped externally protruding portion 502 is larger than the hole diameter of the bushing mounting hole 302.

The outer diameter of the second cylindrical hollow sleeve 501 is equal to the inner diameter of the first cylindrical hollow sleeve 401, so that the second cylindrical hollow sleeve 501 can be sleeved into the first cylindrical hollow sleeve 401.

In practical use, the two mounting plates 3 of each group of mounting pieces are correspondingly arranged on the front side and the rear side of the copper bar 1, one mounting plate 3 is arranged in the first insulation guide positioning bush 4, and the other mounting plate 3 is arranged in the second insulation guide positioning bush 5. The second cylindrical hollow body 501 of the second insulating guide and positioning bushing 5 is then inserted into the first cylindrical hollow body 401. After insertion, the first and second disc-shaped

convex portions

402 and 502 are flush with the outer surface of the mounting plate 3, respectively. Then, the screw rod passes through the first through hole 403 of the first disc-shaped convex part 402 and is sequentially inserted into the first cylindrical hollow sleeve body 401, the second cylindrical hollow sleeve body 501 and the second through hole 503 of the second disc-shaped convex part 502, and then the screw rod is exposed out of two sides of the mounting plate 3 and is screwed down by nuts.

According to above-mentioned structural design with two sets of installed parts fastening connection respectively at current sensor 2's top and bottom, can be with current sensor 2 firm clamp tightly on copper bar 1.

In the present embodiment, as a preferable mode, the mounting plate 3 is an epoxy phenolic laminated cloth plate which has good mechanical strength, high thermal strength, small deformation tendency, and high chemical corrosion resistance and moisture resistance, and is a high insulating material plate, and is an important insulating material plate in the electrical appliance industry.

In the present embodiment, the first insulating guide positioning bush 4 and the second insulating guide positioning bush 5 are preferably phenolic resin abrasion-resistant bushes, which have good insulating properties, high mechanical strength and thermal strength, low deformation tendency, and high chemical corrosion resistance and moisture resistance.

In this embodiment, a screw and a nut made of SUS304 stainless steel are preferably used.

The device can utilize the action of manpower to convert a mechanical mechanism of the screw rod which makes linear motion back and forth into linear motion through rotary motion, thereby achieving the purposes of free expansion and retraction and distance adjustment in a certain range, simultaneously embedding the guide positioning bush in the mounting plate for convenient use, fixing a clamped object (such as a current sensor) at any position of a copper bar to clamp without wandering, and effectively fixing and clamping the clamped object at any position of a copper bar Hall current sensor at the central point of a transformer.

While the utility model has been described with reference to specific embodiments, the utility model is not limited thereto, and those skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope of the utility model. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. The utility model provides a low-voltage cabinet copper bar and current sensor's clamping device for press from both sides between copper bar (1) and current sensor (2) of low-voltage cabinet among the transformer sound level vibration monitoring system and press from both sides tightly fixed, current sensor (2) cover is established on copper bar (1), its characterized in that, the device are including locating two sets of installed parts on copper bar (1), two sets of installed parts are located respectively current sensor (2) top and bottom to press from both sides current sensor (2) tightly on copper bar (1) through the fastener, the fastener includes screw rod, nut and cover and establishes the guiding orientation bush outside the screw rod.

2. The clamping device for the copper bar and the current sensor of the low-voltage cabinet as claimed in claim 1, wherein each set of the mounting members respectively comprises two mounting plates (3) with the same size and structure, the two mounting plates (3) are respectively and correspondingly arranged on the front side and the rear side of the copper bar (1), and two ends of each mounting plate (3) are respectively connected through the fastening member.

3. The clamping device for the low-voltage cabinet copper bar and the current sensor is characterized in that the fastener comprises a screw, a nut, a first insulation guide positioning bushing (4) and a second insulation guide positioning bushing (5), when the clamping device is installed, the first insulation guide positioning bushing (4) and the second insulation guide positioning bushing (5) are sleeved outside the screw, bushing installation holes (302) used for being in interference fit with the first insulation guide positioning bushing (4) and the second insulation guide positioning bushing (5) are symmetrically formed in two ends of each installation plate (3), and one side, close to a contact surface of the copper bar (1), of each installation plate (3) is provided with a plane groove (301) which is recessed inwards.

4. The clamping device for the copper bar and the current sensor of the low-voltage cabinet as claimed in claim 3, wherein the first insulation guide positioning bushing (4) is in interference fit with a bushing mounting hole (302) of the mounting plate (3) located on the front side of the copper bar (1), and the second insulation guide positioning bushing (5) is in interference fit with a bushing mounting hole (302) of the mounting plate (3) located on the rear side of the copper bar (1).

5. The clamping device for the copper bar and the current sensor of the low-voltage cabinet as claimed in claim 4, wherein the first insulation guide positioning bushing (4) comprises a first cylindrical hollow bushing body (401) and a first disc-shaped external protrusion (402) which is arranged at one end of the first cylindrical hollow bushing body (401) and connected with each other, a first through hole (403) for inserting a screw rod is formed in the center of the first disc-shaped external protrusion (402), and the first cylindrical hollow bushing body (401) is in interference fit with the bushing mounting hole (302).

6. The clamping device for the copper bar and the current sensor of the low-voltage cabinet as claimed in claim 5, wherein the inner diameter of the first cylindrical hollow sleeve body (401) is larger than the outer diameter of the screw rod, and the outer diameter of the first disc-shaped convex portion (402) is larger than the bore diameter of the bushing mounting hole (302).

7. The clamping device for the low-voltage cabinet copper bar and the current sensor as claimed in claim 4, wherein the second insulation guide positioning bushing (5) comprises a second cylindrical hollow sleeve body (501) and a second disc-shaped convex portion (502) arranged at one end of the second cylindrical hollow sleeve body (501), the second disc-shaped convex portion (502) is provided with a second through hole (503) for inserting a screw rod at the center, and the second cylindrical hollow sleeve body (501) is in interference fit with the bushing mounting hole (302).

8. The clamping device for the copper bar and the current sensor of the low-voltage cabinet as claimed in claim 7, wherein the inner diameter of the second cylindrical hollow sleeve body (501) is equal to the outer diameter of the screw rod, and the outer diameter of the second disc-shaped convex portion (502) is larger than the bore diameter of the bushing mounting hole (302).

9. The clamping device for the low-voltage cabinet copper bar and the current sensor as claimed in claim 3, wherein the first insulation guide positioning bushing (4) and the second insulation guide positioning bushing (5) are phenolic resin wear-resistant bushings.

10. The clamping device for the copper bar and the current sensor of the low-voltage cabinet as claimed in claim 3, wherein the screw is made of SUS304 stainless steel, and the nut is made of SUS304 stainless steel.