Neutral line overlapping conversion module of change-over switch

Abstract

The utility model relates to the technical field of change-over switches, and discloses a neutral line overlapping conversion module of a change-over switch, which comprises a rotating shaft sleeve, the neutral line overlapping conversion module is arranged in the change-over switch, the change-over switch comprises a shell, an arc-shaped rod is rotationally arranged on the rotating shaft sleeve, a fixed plate is rotationally arranged at one end of the arc-shaped rod, and a straight rod III is fixedly connected onto the fixed plate. A plurality of fixing plates are fixed on the positioning shaft, a V-shaped block is rotated in the shell, a straight rod IV is fixed at one end of the V-shaped block, a kidney-shaped hole is formed in the other end of the V-shaped block, a moving contact is fixed on the straight rod IV, a copper contact I is fixed in the shell, a soft connecting wire connected with the moving contact is fixed on the copper contact I, and copper contacts II are fixed on two sides of the copper contact I in the shell. The distance between the neutral pole N and other phases is consistent, the up-down, left-right and front-back space increase of the whole switch is not generated, the modular neutral line overlapping conversion module is convenient to assemble and maintain in structure, the state indication window is marked, and the opening, closing and overlapping position states of the contact can be accurately judged.

Description

Technical Field

[0001] This utility model relates to the field of changeover switch technology, specifically a neutral line overlap switching module for a changeover switch. Background Art

[0002] With the improvement of people's living standards and the widespread use of electricity and electrical equipment, many places have strict requirements for the continuity of power supply and do not allow long-term power outages. Most of them use automatic transfer switches to ensure continuous power supply. Because the neutral pole and phase pole structures of ordinary automatic transfer switches are the same, the closing and opening states of each pole are consistent during the switching process, that is, they close and open at the same time.

[0003] During the process of an automatic transfer switch switching between two power sources, there is a brief moment when the neutral terminal of the load side is not connected to either power source's neutral terminal as the neutral terminal of the first power source disconnects and the second power source connects. In some special power distribution scenarios, such as data centers, automatic transfer switches are often used in combination with uninterruptible power supplies (UPS) as backups for mains power or dedicated generators. The power sources are switched via the automatic transfer switch, and the load is connected to the power source via the UPS within the data center, thus enabling mains power to supply the load.

[0004] When the neutral terminal of the UPS is not connected to the neutral terminal of any power source, a brief momentary change in the neutral terminal's potential relative to ground will occur. This will adversely affect the electrical load equipment, and may even cause the load equipment, such as servers, to restart or corrupt data. In order to ensure that the neutral line remains connected during the conversion process, a separate neutral line overlap unit needs to be set up.

[0005] The existing neutral line overlap structure of transfer switch electrical technology requires additional space above or laterally on the neutral pole N phase. At the same time, it cannot guarantee the opening distance, overtravel and final pressure of the neutral pole contacts, and may even affect the mechanism's reset action and switching speed. This is not conducive to the reliability design of the neutral line overlap structure. In addition, it has a higher volume and cost. Therefore, a neutral line overlap switching module for transfer switches is needed. Utility Model Content

[0006] The purpose of this invention is to provide a neutral line overlap switching module for a changeover switch to solve the problems in the prior art.

[0007] The objective of this utility model can be achieved through the following technical solutions:

[0008] A neutral line overlap conversion module for a changeover switch, the neutral line overlap conversion module includes a rotating shaft sleeve, the neutral line overlap conversion module is installed inside the changeover switch, the changeover switch includes a housing, an arc-shaped rod rotatably mounted on the rotating shaft sleeve, a fixed plate rotatably mounted at one end of the arc-shaped rod, a straight rod three fixedly mounted on the fixed plate, and several fixed plates fixed on a positioning shaft.

[0009] The housing contains a rotating V-shaped block. One end of the V-shaped block is fixed with a straight rod four, and the other end is provided with a waist hole. A moving contact is fixed on the straight rod four. A copper contact one is fixed inside the housing. A flexible connecting wire connected to the moving contact is fixed on the copper contact one. Copper contacts two are fixed inside the housing and on both sides of the copper contact one.

[0010] Furthermore, one side of the housing is symmetrically provided with an arc groove, and another side of the housing is symmetrically provided with an arc groove. Threaded holes are arranged in an array on the housing, and bolts are connected to the threaded holes.

[0011] The housing is provided with a pin groove, and a pin is fixed on the housing. The pin groove on one changeover switch cooperates with the pin on another changeover switch.

[0012] Furthermore, the housing has symmetrical through holes on one side, the through holes and the arc groove are coaxial, and the housing has symmetrical opening slots. The opening slots on the two housings are connected to form a status indicator window, and the opening slots are located above the through holes.

[0013] Furthermore, the housing is provided with mounting grooves at both ends, and an arc-inducing plate is fixed on the second copper contact. The arc-inducing plate and the second copper contact are located in the mounting groove.

[0014] Furthermore, a rotating bushing is rotatably mounted inside the through hole, and an indicator plate is fixed on the rotating bushing. The indicator plate is located at the status indicator window. A connecting hole is provided at the axis of the rotating bushing. A side block is fixed on one side of the rotating bushing, and a straight rod rotatably mounted on the side block. An arc-shaped rod is symmetrically fixed on the straight rod 1. A straight rod 2 is fixed to one end of the arc-shaped rod, and the end of the straight rod 1 is slidably connected to the arc groove 1.

[0015] Furthermore, a positioning shaft is rotatably mounted inside the housing, one end of the fixing plate is rotatably connected to the straight rod two, and the other end is fixed to the straight rod three.

[0016] Furthermore, the moving contact is provided with a spring retaining sleeve, and a compression spring is fixed inside the spring retaining sleeve and fixed to the moving contact.

[0017] Furthermore, the waist hole is slidably connected to the straight rod three, a rotating rod is fixed on the V-shaped block, the two ends of the rotating rod are rotatably connected to the housing, the straight rod four passes through several spring fixing sleeves, and the rotating rod passes through several moving contacts.

[0018] The beneficial effects of this utility model are:

[0019] 1. The neutral line overlap conversion module of this utility model has the same spacing between the neutral pole N and other phases, which will not increase the overall space of the switch in the vertical, horizontal and vertical directions. The modular neutral line overlap conversion module is easy to assemble and maintain.

[0020] 2. In this utility model, the neutral line overlap conversion module has a rotating shaft sleeve located at the status indicator window, which can indicate the status. Its markings are conspicuous and can accurately determine the contact opening and closing and overlap positions.

[0021] 3. The neutral line overlap conversion module of this utility model has a multi-link hinge that makes the contact parameters of the neutral pole N in the overlap state more stable and reliable. When the two circuits of the conversion switch mechanism are opened, the main pressure spring releases in the middle stage and the force value is large enough to start closing the N pole overlap. Compared with the existing function of starting to close the N pole overlap when the force value is small in the later stage of the main pressure spring release, the neutral pole contact pressure and overtravel are more reliable. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings.

[0023] Figure 1 This is a schematic diagram of the structure of the changeover switch of this utility model;

[0024] Figure 2 This is a cross-sectional structural diagram of the changeover switch of this utility model;

[0025] Figure 3 This is a schematic diagram of the internal structure of the changeover switch of this utility model;

[0026] Figure 4 This is a partial structural schematic diagram of the neutral line overlap conversion module of this utility model;

[0027] Figure 5 This is a schematic diagram of the internal structure of the changeover switch of this utility model;

[0028] Figure 6 This is a utility model Figure 6 Enlarged structural diagram at point A in the middle;

[0029] Figure 7 This is a schematic diagram illustrating the conversion and return of the neutral line N pole of this utility model;

[0030] Figure 8 This is a schematic diagram of the overlapping contact group of the neutral line N pole of this utility model.

[0031] The attached diagram is described below:

[0032] 1. Housing; 2. Rotating shaft sleeve; 3. Arc rod; 4. V-block; 5. Spring retaining sleeve; 6. Positioning shaft; 10. Copper contact one; 11. Arc groove one; 12. Arc groove two; 13. Threaded hole; 14. Opening groove; 15. Through hole; 16. Pin groove; 17. Pin rod; 18. Mounting groove; 19. Copper contact two; 21. Indicator plate; 22. Connecting hole; 23. Side block; 31. Straight rod one; 32. Straight rod two; 33. Fixing plate; 34. Straight rod three; 41. Waist hole; 42. Rotating rod; 43. Straight rod four; 101. Flexible connecting wire; 102. Moving contact; 103. Arc igniter. DETAILED DESCRIPTION

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0034] A neutral line overlap switching module for a changeover switch, such as Figures 1-6 As shown, the changeover switch includes a housing 1. One side of the housing 1 has symmetrically distributed arc grooves 11 and another side of the housing 1 has symmetrically distributed arc grooves 12. The first arc groove 11 is located above the second arc groove 12. The housing 1 has an array of threaded holes 13. Bolts are connected to the threaded holes 13 to fix the housing 1.

[0035] The housing 1 has a pin groove 16 and a pin rod 17 fixed on the housing 1. Two adjacent changeover switches are fitted together to form a modular changeover switch. The pin groove 16 on one changeover switch cooperates with the pin rod 17 on the other.

[0036] A symmetrically distributed through hole 15 is provided on one side of the housing 1. The through hole 15 is coaxial with the arc groove 11. A symmetrically distributed opening slot 14 is provided on the housing 1. After the two housings 1 are connected, the opening slots 14 on them are connected to form a status indicator window for observation and indication. The opening slot 14 is located above the through hole 15.

[0037] The housing 1 has mounting slots 18 at both ends for mounting the arc-extinguishing chamber. A copper contact 10 is fixedly installed inside the housing 1. A flexible connecting wire 101 is fixedly installed on the copper contact 10. A moving contact 102 is fixedly installed at the end of the flexible connecting wire 101 away from the copper contact 10. A copper contact 19 is fixedly installed inside the housing 1 on both sides of the copper contact 10. An arc-inducing plate 103 is fixedly installed on the copper contact 19. A screw passes through the arc-inducing plate 103 and the copper contact 19 and is threadedly connected to the housing 1. The arc-inducing plate 103 and the copper contact 19 are located in the mounting slots 18.

[0038] After the moving contact 102 rotates, it can connect with the corresponding copper contact 19, so that copper contact 101 is connected to one copper contact 19. Conversely, copper contact 101 is connected to another copper contact 19, so as to realize the neutral line overlap switching operation of the changeover switch.

[0039] A rotating bushing 2 is provided inside the through hole 15. An indicator plate 21 is fixed on the rotating bushing 2. The indicator plate 21 is located at the status indicator window. When the rotating bushing 2 rotates, the indicator plate 21 rotates and displays the neutral line overlap conversion status at the status indicator window.

[0040] A connecting hole 22 is provided at the center of the shaft sleeve 2. The cross-sectional shape of the connecting hole 22 is one of rectangle, circle, ellipse or rhombus. A side block 23 is fixedly provided on one side of the shaft sleeve 2. A straight rod 31 is rotatably connected to the side block 23. A symmetrically distributed arc rod 3 is fixedly provided on the straight rod 31. A straight rod 32 is fixedly connected to the end of the arc rod 3 away from the straight rod 31. The end of the straight rod 31 is slidably connected to the arc groove 11.

[0041] The housing 1 is rotatably provided with a positioning shaft 6, and several fixing plates 33 are fixedly provided on the positioning shaft 6. One end of the fixing plate 33 is rotatably connected to the straight rod 32, and the other end is fixedly provided with the straight rod 34. The positioning shaft 6 is connected to the straight rod 32 on both sides of the positioning shaft 6 through the fixing plates 33 symmetrically arranged on it, so as to connect with the two rotating shaft sleeves 2, which facilitates the neutral line overlap conversion operation.

[0042] A spring fixing sleeve 5 is fitted on the moving contact 102. A compression spring (not shown in the figure) is fixedly installed inside the spring fixing sleeve 5. The compression spring is connected to the moving contact 102 and applies pressure to the moving contact 102. A V-shaped block 4 is fixedly installed on the side of the moving contact 102. A rotating rod 42 is fixedly installed on the V-shaped block 4. The two ends of the rotating rod 42 are rotatably connected to the housing 1. A straight rod 43 is fixedly installed at one end of the V-shaped block 4, and a waist hole 41 is opened at the other end. The straight rod 43 passes through several spring fixing sleeves 5, and the rotating rod 42 passes through several moving contacts 102. The straight rod 43 and the rotating rod 42 are used to fix and connect multiple moving contacts 102 in parallel, and to stably connect the overlapping moving contacts 102.

[0043] The waist hole 41 is slidably connected to the straight rod 34. When a rotating shaft sleeve 2 rotates, the arc rod 3 drives the positioning shaft 6 and the fixing plate 33 on it to rotate. During the rotation of the fixing plate 33, the straight rod 34 slides in the waist hole 41, driving the V-block 4 to rotate on the rotating rod 42, causing the moving contact 102 to rotate. The straight rod 43 is slidably connected to the arc groove 12.

[0044] The working principle is as follows:

[0045] This utility model adopts a single-phase (pole) modular design for the execution changeover switch, which includes two incoming lines, a load-side outgoing line, and a drive shaft sleeve 2, an arc rod 3, a V-block 4, a positioning shaft 6, a moving contact system, an arc-extinguishing chamber, etc., all integrated into an independent cavity. The moving contact group uses multiple moving contacts 102, and each moving contact 102 is provided with a compression spring and a spring fixing sleeve 5, so that each contact has independent pressure after closing.

[0046] The stationary contact assembly is fixed to the bottom of the housing with screws. The two moving contacts 102 are made of copper braided wire and form a soft connection structure with the external load busbar. They are set back on both sides to provide two independent arc extinguishing spaces, which fundamentally avoids arc short circuits in the normal and standby circuits.

[0047] Meanwhile, to more accurately reflect the current contact position status, a status indicator window is provided on the front of the changeover switch to indicate the position.

[0048] Furthermore, in order to achieve the overlapping and switching of the neutral pole contacts, a three-bar linkage is used between the opening and closing rotation of the rotating shaft sleeve and the opening and closing action of the moving contact. A positioning shaft 6 is set at the center position. The rotation of the commonly used rotating shaft drives the opening and closing of the spare contact, and the rotation of the spare shaft drives the opening and closing of the commonly used contact.

[0049] like Figure 7 As shown, the operating sequence is as follows: When the normal operating side is in the closed position, the standby neutral line N pole can obtain a large opening gap. Simultaneously with the switch disconnecting the normal operating side, the normal operating neutral line N pole does not operate and remains connected; the standby neutral line N pole contact is first closed, then the standby phase line contact closes, simultaneously disconnecting the normal operating neutral line N pole contact; the same steps are followed when switching to normal operating connection.

[0050] like Figure 8 As shown in the diagram, the overlap of the neutral line N pole contact group is as follows: During the switching process, the angle ∠a decreases, which in turn causes the angle ∠b to decrease, resulting in the angle ∠c to increase, thus achieving contact disconnection; conversely, the contacts overlap when closing. It is easy to see that the three-link transmission is more efficient during the closing and opening process, and the force acting on the rotating shaft sleeve 2 is during the middle of the release of the main compression spring of the mechanism (when the force value is large), making the overlap of the neutral line N pole more reliable.

[0051] In addition, the advantages are as follows: the angle of ∠c determines the overtravel and final pressure of the contact. In the actual production process, due to the cumulative error of the machining, the angles of ∠a and ∠b will be smaller than the design value. However, the angle of ∠c is smaller because the connecting hole at the end of the contact rod tends to be horizontal and the sliding surface of the hole 41 is tangent to the connecting pin. Therefore, the cumulative tolerance of ∠c changes less, and the influence on the pressure and overtravel acting on the contact is smaller, making the overlap more reliable.

[0052] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A neutral line overlap switching module for a changeover switch, the neutral line overlap switching module comprising a rotating shaft sleeve (2), characterized in that, The neutral line overlap conversion module is installed inside the conversion switch. The conversion switch includes a housing (1), an arc rod (3) rotating on a rotating shaft sleeve (2), a fixing plate (33) rotating at one end of the arc rod (3), a straight rod (34) fixed on the fixing plate (33), and several fixing plates (33) fixed on the positioning shaft (6). The housing (1) contains a rotating V-block (4). One end of the V-block (4) is fixed with a straight rod (43), and the other end is provided with a waist hole (41). A moving contact (102) is fixed on the straight rod (43). A copper contact (10) is fixed inside the housing (1). A flexible connecting wire (101) connected to the moving contact (102) is fixed on the copper contact (10). Copper contacts (19) are fixed inside the housing (1) and on both sides of the copper contact (10).

2. The neutral line overlap switching module of the changeover switch according to claim 1, characterized in that, The housing (1) has a first arc groove (11) symmetrically arranged on one side, a second arc groove (12) symmetrically arranged on one side, and a threaded hole (13) arrayed on the housing (1), with bolts connected to the threaded hole (13). The housing (1) is provided with a pin groove (16) and a pin rod (17) is fixed on the housing (1). The pin groove (16) on one changeover switch cooperates with the pin rod (17) on another changeover switch.

3. The neutral line overlap switching module of the changeover switch according to claim 1, characterized in that, The housing (1) has symmetrical through holes (15) on one side. The through holes (15) are coaxial with the arc groove (11). The housing (1) has symmetrical opening slots (14). The opening slots (14) on the two housings (1) are connected to form a status indicator window. The opening slots (14) are located above the through holes (15).

4. The neutral line overlap switching module of the changeover switch according to claim 3, characterized in that, The housing (1) has mounting grooves (18) at both ends, and an arc-starting plate (103) is fixed on the copper contact (19). The arc-starting plate (103) and the copper contact (19) are located in the mounting groove (18).

5. The neutral line overlap switching module of a changeover switch according to claim 4, characterized in that, A rotating bushing (2) is rotatably mounted inside the through hole (15). An indicator plate (21) is fixed on the rotating bushing (2). The indicator plate (21) is located at the status indicator window. A connecting hole (22) is provided at the axis of the rotating bushing (2). A side block (23) is fixed on one side of the rotating bushing (2). A straight rod (31) rotates on the side block (23). An arc rod (3) is symmetrically fixed on the straight rod (31). A straight rod (32) is fixed to one end of the arc rod (3). The end of the straight rod (31) is slidably connected to the arc groove (11).

6. The neutral line overlap switching module of a changeover switch according to claim 5, characterized in that, The housing (1) has a rotatable positioning shaft (6), one end of the fixing plate (33) is rotatably connected to the straight rod two (32), and the other end is fixed with the straight rod three (34).

7. The neutral line overlap switching module of a changeover switch according to claim 1, characterized in that, The moving contact (102) is provided with a spring fixing sleeve (5), and a compression spring is fixed inside the spring fixing sleeve (5). The compression spring is fixed on the moving contact (102).

8. The neutral line overlap switching module of a changeover switch according to claim 6, characterized in that, The waist hole (41) is slidably connected to the straight rod three (34), and a rotating rod (42) is fixed on the V-shaped block (4). The two ends of the rotating rod (42) are rotatably connected to the shell (1). The straight rod four (43) passes through several spring fixing sleeves (5), and the rotating rod (42) passes through several moving contacts (102).

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