A low voltage transformer

Abstract

The present application relates to the technical field of transformers, and specifically to a low-voltage transformer, which at least includes a transformer body and a secondary terminal junction box, wherein the secondary terminal junction box includes a junction box body, a terminal assembly, a pressing device, and a short-circuiting device; the terminal junction box body is in the shape of a rectangular shell, and the upper end face of the junction box body is provided with an upper adjustment hole and an upper wiring hole; the terminal assembly is arranged at the front end face of the junction box body; the pressing device is arranged above the rear end face of the junction box body; the short-circuiting device is arranged below the rear end face of the junction box body, and the short-circuiting device is squeezed and displaced backward by the pressing device, and the short-circuiting device contacts the terminal assembly to achieve short-circuiting. The low-voltage transformer described in this case is connected to an electric meter through a conductive wire clamp through the secondary terminal junction box under normal conditions. When the electric meter needs to be replaced, the secondary side can be short-circuited by rotating the torsion rod without the need for other wire clamps and wires.

Description

Technical Field

[0001] The present application relates to the technical field of transformers, and in particular to a low-voltage transformer. Background Art

[0002] A current transformer is a device that converts large currents in a power system into small currents. Its secondary winding signal is mainly used for protection, measurement, and metering. In actual work, it is often necessary to short-circuit the secondary side of the current transformer in order to replace and repair the secondary side meter. However, due to the small wiring screws of the secondary terminals of the current transformer, the traditional connection method is very inconvenient. The connection of the secondary terminals of the traditional transformer is often done by winding bare copper wire or using alligator clips, but both have great safety hazards and are inconvenient to use.

[0003] This case provides a low-voltage transformer that can short-circuit the terminal assembly on the secondary side. Summary of the invention

[0004] A low voltage transformer comprises at least a transformer body and a secondary terminal junction box arranged at the front end of the transformer body, wherein the secondary terminal junction box comprises:

[0005] The junction box body is in a rectangular shell shape, with an upper adjustment hole in the middle of the upper end surface of the junction box body, and a wiring upper hole on the left and right sides of the upper end surface of the junction box body respectively; the left and right sides of the junction box body can be detachably arranged.

[0006] The terminal assembly is arranged at the front end of the junction box body, and two terminal assemblies are provided, and the two terminal assemblies are symmetrically distributed on the left and right;

[0007] A pressing device, arranged above the rear end surface of the junction box body;

[0008] The short-circuit device is arranged below the rear end surface of the junction box body. The short-circuit device is squeezed and displaced backward by the pressing device. The short-circuit device contacts the terminal assembly to achieve short-circuit.

[0009] As an improved technical solution:

[0010] The terminal assembly includes a terminal substrate arranged on the front end surface of the terminal box body, a terminal column arranged at the rear end of the terminal substrate, a terminal transverse axis arranged on the inner side of the terminal column, a limiting slot arranged on the terminal transverse axis, a sliding sleeve slidably arranged on the terminal transverse axis, a driven inclined surface arranged on the inner side of the lower end of the sliding sleeve, a spring rod arranged on the inner wall of the sliding sleeve and inserted into the limiting slot, a reset compression spring arranged in the limiting slot and driving the spring rod and the sliding sleeve to pop out inward, and the driven inclined surface gradually inclines from top to bottom in the direction deviating from the center of the adjusting upper hole; the terminal substrate and the terminal column of the terminal assembly are made of conductive material.

[0011] The pressing device includes a cylindrical foundation arranged above the rear end surface of the junction box body, a limiting ring arranged in the middle of the inner wall of the cylindrical foundation, a horizontal through hole arranged through the lower half of the cylindrical foundation in the left and right directions, an internally threaded tube rotatably arranged in the cylindrical foundation above the limiting ring, and an externally threaded rod screwed in the internally threaded tube, and the left and right sides of the externally threaded rod are respectively provided with retaining cross arms passing through the horizontal through hole, and the distal end of the retaining cross arm abuts against the sliding sleeve; the lower end of the externally threaded rod is provided with a pressure inclined surface that is squeezed and matched with the pressure inclined surface; the upper end of the internally threaded tube is provided with a torsion push rod, and the upper end of the torsion push rod passes through the cylindrical foundation and the upper end of the junction box body; the upper end of the torsion push rod is provided with a straight-line socket or a cross socket; the stop end of the retaining cross arm is provided with an active inclined surface that matches with the driven inclined surface.

[0012] The short-circuit device includes a guide cross bar arranged below the rear end surface of the junction box body in the front-to-back direction, and a longitudinal stop block arranged above the front end of the guide cross bar. The short-circuit device also includes a pressure-bearing slider arranged in the junction box body, a pressure-bearing inclined surface arranged at the rear end of the pressure-bearing slider, a cross bar socket arranged at the rear end of the pressure-bearing slider for accommodating the insertion of the guide cross bar, a spring cavity arranged at the front end of the cross bar socket and accommodating the longitudinal stop block, a short-circuit compression spring arranged in the spring cavity and located behind the longitudinal stop block, and a short-circuit cross plate arranged at the front end of the pressure-bearing slider for connecting two terminal substrates, and the pressure-bearing inclined surface is located below the external threaded rod; further, the short-circuit cross plate is made of conductive material.

[0013] Beneficial effects:

[0014] A low-voltage transformer described in this case is connected to an electric meter through a conductive wire clamp via a secondary terminal junction box under normal circumstances. When the electric meter needs to be replaced, the secondary side can be short-circuited by rotating the torsion rod without the need for other wire clamps and wires.

[0015] A low-voltage transformer described in this case can simultaneously realize short-circuit operation and release operation through a pressure-down device:

[0016] Short-circuit operation: the downward pressing device drives the short-circuit device to move forward, and the short-circuit horizontal plate connects a pair of terminal substrates to achieve short-circuit of a pair of terminal assemblies.

[0017] Release operation: the downward movement of the pressing device causes the terminal assembly to stretch under the action of the reset compression spring, and the sliding sleeve no longer compresses and fixes the conductive wire clamp, thereby releasing the conductive wire clamp and the electric meter connected between the pair of conductive wire clamps. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of an embodiment of the low-voltage transformer.

[0019] Figure 2It is a schematic diagram of an embodiment of the secondary wiring assembly.

[0020] Figure 3 It is a side view of an embodiment of the secondary wiring assembly.

[0021] Figure 4 It is a front view of an embodiment of the secondary wiring assembly.

[0022] Figure 5 yes Figure 3 A cross-sectional view of section AA in one state.

[0023] Figure 6 yes Figure 3 Cross-sectional view of section AA in another state.

[0024] Figure 7 yes Figure 3 A cross-sectional view of section AA in another state (the pressing device and the short-circuiting device are omitted).

[0025] Figure 8 yes Figure 3 An isometric sectional view of an embodiment of the AA section (the upper cover of the junction box is omitted).

[0026] Fig. 9 yes Figure 4 A cross-sectional view of the BB section in one state.

[0027] Fig.10 yes Figure 4 A cross-sectional view of section BB in another state.

[0028] Fig.11 yes Figure 4 Isometric sectional view of section BB in one state (the upper cover of the junction box is omitted).

[0029] In the figure:

[0030] 9. Transformer body;

[0031] 8. Secondary terminal junction box;

[0032] 7. Conductive wire clip;

[0033] 1. Junction box body, 11. Adjustment upper hole, 12. Wiring upper hole;

[0034] 2. Terminal assembly, 21. Terminal substrate, 22. Wiring column, 23. Wiring horizontal axis, 24. Limiting slot, 25. Sliding sleeve, 26. Follower inclined plane, 27. Spring plug rod, 28. Reset compression spring;

[0035] 3. Pressing device, 31. Cylinder base, 32. Limiting ring, 33. Horizontal through hole, 34. Internal threaded tube, 35. External threaded rod, 36. Retaining cross arm, 37. Twisting ejector rod;

[0036] 4. Short-circuiting device, 41. Guide cross bar, 42. Longitudinal stopper, 43. Pressure-bearing slide block, 44. Pressure-bearing inclined surface, 45. Cross bar jack, 46. Spring inner cavity, 47. Short-circuiting compression spring, 48. Short-circuiting cross plate. DETAILED DESCRIPTION

[0037] A low voltage transformer comprises at least a transformer body 9 and a secondary terminal junction box 8 arranged at the front end of the transformer body 9, wherein the secondary terminal junction box 8 comprises:

[0038] The junction box body 1 is in a rectangular shell shape, with an upper adjustment hole 11 in the middle of the upper end surface of the junction box body 1, and a wiring upper hole 12 is respectively provided on the left and right sides of the upper end surface of the junction box body 1; the left and right sides of the junction box body 1 can be detachably arranged.

[0039] The terminal assembly 2 is arranged at the front end surface of the junction box body 1. The terminal assembly 2 is provided with two, and the two terminal assemblies 2 are symmetrically distributed on the left and right;

[0040] A pressing device 3 is arranged above the rear end surface of the junction box body 1;

[0041] The short-circuit device 4 is arranged below the rear end surface of the junction box body 1 . The short-circuit device 4 is squeezed and displaced backward by the pressing device 3 . The short-circuit device 4 contacts the terminal assembly 2 to achieve short-circuit.

[0042] As an improved technical solution:

[0043] The terminal assembly 2 includes a terminal substrate 21 arranged on the front end surface of the terminal box body 1, a terminal column 22 arranged at the rear end of the terminal substrate 21, a terminal transverse axis 23 arranged on the inner side of the terminal column 22, a limiting slot 24 arranged on the terminal transverse axis 23, a sliding sleeve 25 slidably arranged on the terminal transverse axis 23, a driven inclined surface 26 arranged on the inner side of the lower end of the sliding sleeve 25, a spring rod 27 arranged on the inner wall of the sliding sleeve 25 and inserted into the limiting slot 24, and a reset compression spring 28 arranged in the limiting slot 24 and driving the spring rod 27 and the sliding sleeve 25 to pop out inward, and the driven inclined surface 26 gradually inclines from top to bottom in the direction of deviating from the center of the adjusting upper hole 11; the terminal substrate 21 and the terminal column 22 of the terminal assembly 2 are made of conductive material.

[0044] The pressing device 3 comprises a cylindrical base 31 arranged above the rear end face of the junction box body 1, a limiting ring 32 arranged in the middle of the inner wall of the cylindrical base 31, a horizontal through hole 33 arranged in the left-right direction through the lower half of the cylindrical base 31, an internally threaded tube 34 rotatably arranged in the cylindrical base 31 above the limiting ring 32, and an externally threaded rod 35 screwed in the internally threaded tube 34, and the left and right sides of the externally threaded rod 35 are respectively provided with a through hole 33 arranged A retaining cross arm 36, the distal end of which abuts against the sliding sleeve 25; the lower end of the external threaded rod 35 is provided with a pressure inclined surface that is squeezed and matched with the pressure inclined surface 44; the upper end of the internal threaded tube 34 is provided with a torsion push rod 37, the upper end of which passes through the cylindrical base 31 and the upper end of the junction box body 1; the upper end of the torsion push rod 37 is provided with a straight-line socket or a cross socket; the stop end of the retaining cross arm 36 is provided with an active inclined surface that cooperates with the driven inclined surface 26.

[0045] The short-circuit device 4 includes a guide cross bar 41 arranged below the rear end surface of the junction box body 1 along the front-to-back direction, and a longitudinal stopper 42 arranged above the front end of the guide cross bar 41. The short-circuit device 4 also includes a pressure-bearing slider 43 arranged in the junction box body 1, a pressure-bearing inclined surface 44 arranged at the rear end of the pressure-bearing slider 43, a cross bar insertion hole 45 arranged at the rear end of the pressure-bearing slider 43 for accommodating the insertion of the guide cross bar 41, a spring inner cavity 46 arranged at the front end of the cross bar insertion hole 45 and accommodating the longitudinal stopper 42, a short-circuit compression spring 47 arranged in the spring inner cavity 46 and located behind the longitudinal stopper 42, and a short-circuit cross plate 48 arranged at the front end of the pressure-bearing slider 43 for connecting two terminal substrates 21, and the pressure-bearing inclined surface 44 is located below the external threaded rod 35; further, the short-circuit cross plate 48 is made of conductive material.

[0046] In the present case, the secondary terminal junction box 8 of the low-voltage transformer can be fixedly connected to the terminal column 22 by the sliding sleeve 25 under normal conditions, and then the electric meter is connected through the conductive wire clamp 7. When the electric meter needs to be replaced, the secondary terminal junction box 8 is first short-circuited, and then the conductive wire clamp 7 is disconnected and released. The specific method is as follows:

[0047] As the instruction manual Figure 5 As shown, the retaining cross arm 36 abuts against the sliding sleeve 25 to overcome the damping of the return compression spring 28 and retract, and the sliding sleeve 25 squeezes and fixes the conductive wire clamp 7, so that the conductive wire clamp 7 contacts the wiring column 22 and the terminal substrate 21 to achieve electrical connection. At this time, the electric meter can be connected to the conductive wire clamp 7 for normal use.

[0048] The secondary terminal junction box 8 of the low voltage transformer can also be short-circuited:

[0049] Rotate the twisting push rod 37 and the internal threaded tube 34 to drive the external threaded rod 35 and keep the cross arm 36 downward;

[0050] As the instruction manual Fig. 9 , 10 , as shown in 11, short circuit operation:

[0051] The external threaded rod 35 moves downward to press the pressure inclined surface 44 and the pressure slider 43 to overcome the damping of the short-circuit compression spring 47 and move backward. The short-circuit horizontal plate 48 connects the two terminal substrates 21 to realize the secondary side short-circuit.

[0052] at the same time,

[0053] As the instruction manual Figure 5 , 6 , 8, release operation:

[0054] The retaining cross arm 36 moves downward to the height of the driven inclined surface 26, and the reset compression spring 28 drives the sliding sleeve 25 and the driven inclined surface 26 to pop out. The sliding sleeve 25 no longer squeezes and fixes the conductive wire clamp 7. At this time, the two conductive wire clamps 7 are pulled upward to release the two conductive wire clamps 7 and the electric meter connected thereto.

Claims

1. A low voltage transformer, comprising at least a transformer body (9), and a secondary terminal junction box (8) arranged at the front end of the transformer body (9), characterized in that: The secondary terminal junction box (8) comprises: The junction box body (1) is in the shape of a rectangular shell, an upper adjustment hole (11) is provided in the middle of the upper end surface of the junction box body (1), and an upper wiring hole (12) is provided on the left and right sides of the upper end surface of the junction box body (1); A terminal assembly (2) is arranged on the front end surface of the junction box body (1), and two terminal assemblies (2) are provided, and the two terminal assemblies (2) are symmetrically distributed on the left and right; A pressing device (3) is arranged above the rear end surface of the junction box body (1); A short-circuiting device (4) is arranged below the rear end surface of the junction box body (1); the short-circuiting device (4) is squeezed and displaced backward by the pressing device (3); and the short-circuiting device (4) contacts the terminal assembly (2) to achieve short-circuiting; The terminal assembly (2) comprises a terminal base plate (21) arranged on the front end surface of the terminal box body (1), a terminal column (22) arranged on the rear end of the terminal base plate (21), a terminal transverse axis (23) arranged on the inner side of the terminal column (22), a limit slot (24) arranged on the terminal transverse axis (23), a sliding sleeve (25) slidably arranged on the terminal transverse axis (23), a driven inclined surface (26) arranged on the inner side of the lower end of the sliding sleeve (25), a spring rod (27) arranged on the inner wall of the sliding sleeve (25) and inserted into the limit slot (24), and a return compression spring (28) arranged in the limit slot (24) and driving the spring rod (27) and the sliding sleeve (25) to pop out inward, wherein the driven inclined surface (26) is gradually inclined from top to bottom in a direction away from the center of the adjusting upper hole (11); The pressing device (3) comprises a cylindrical base (31) arranged above the rear end surface of the junction box body (1), a limiting ring (32) arranged in the middle of the inner wall of the cylindrical base (31), a transverse through hole (33) arranged to pass through the lower half of the cylindrical base (31) in the left-right direction, an internally threaded tube (34) rotatably arranged in the cylindrical base (31) above the limiting ring (32), and an externally threaded rod (35) screwed into the internally threaded tube (34), wherein the left and right sides of the externally threaded rod (35) are respectively provided with retaining cross arms (36) arranged to pass through the transverse through hole (33), and the distal end of the retaining cross arm (36) abuts against the sliding sleeve (25); The short-circuit device (4) comprises a guide cross bar (41) arranged below the rear end surface of the junction box body (1) along the front-to-back direction, and a longitudinal stopper (42) arranged above the front end of the guide cross bar (41). The short-circuit device (4) also comprises a pressure-bearing slider (43) arranged in the junction box body (1), a pressure-bearing inclined surface (44) arranged at the rear end of the pressure-bearing slider (43), a cross bar insertion hole (45) arranged at the rear end of the pressure-bearing slider (43) for accommodating the guide cross bar (41) to be inserted, a spring inner cavity (46) arranged at the front end of the cross bar insertion hole (45) and accommodating the longitudinal stopper (42), a short-circuit compression spring (47) arranged in the spring inner cavity (46) and located behind the longitudinal stopper (42), and a short-circuit cross plate (48) arranged at the front end of the pressure-bearing slider (43) for connecting two terminal substrates (21), wherein the pressure-bearing inclined surface (44) is located below the external threaded rod (35); The terminal substrate (21) and the terminal column (22) of the terminal assembly (2) are made of conductive material; The short-circuit horizontal plate (48) is made of conductive material.

2. A low voltage transformer according to claim 1, characterized in that: The lower end of the external threaded rod (35) is provided with a pressure-applying inclined surface that is extruded and matched with the pressure-bearing inclined surface (44).

3. A low voltage transformer according to claim 2, characterized in that: The upper end of the internally threaded tube (34) is provided with a torsion push rod (37), and the upper end of the torsion push rod (37) penetrates the cylindrical foundation (31) and the upper end of the junction box body (1).

4. A low voltage transformer according to claim 3, characterized in that: The upper end of the torsion push rod (37) is provided with a slotted hole or a cross hole.

5. A low voltage transformer according to claim 4, characterized in that: The stop end of the retaining cross arm (36) is provided with an active inclined surface that cooperates with the driven inclined surface (26).

6. A low voltage transformer according to claim 5, characterized in that: The left and right sides of the junction box body (1) can be detachably arranged.

Images