Neutral line overlapping conversion module of change-over switch

Abstract

The invention 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 mounted 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 to 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, up-and-down, left-and-right and front-and-back space increase of the whole switch cannot be generated, the modular neutral line overlapping conversion module is convenient to assemble and maintain in structure, a state indication window is marked, and the opening, closing and overlapping position states of a contact can be accurately judged.

Description

Technical Field

[0001] The invention relates to the technical field of transfer switches, in particular to a neutral line overlapping transfer module of a transfer switch. Background Art

[0002] With the improvement of human living standards, the widespread application of electricity and electrical equipment has led to strict requirements on power supply continuity in many places. Long-term power outages are not allowed. Most of them use automatic transfer switches to ensure continuous power supply. Since the neutral pole and phase pole structures of ordinary automatic transfer switches are the same, the closing and opening states of each pole during the conversion process are consistent, that is, they are closed and opened at the same time.

[0003] When the automatic transfer switch switches two power sources, there is a brief moment when the neutral pole of the previous power source is disconnected and connected to the neutral pole of the next power source. In some special power distribution occasions such as data centers, automatic transfer switches are usually used in combination with uninterruptible power supplies (UPS), which serve as backup for the mains power supply or dedicated generators. The power sources are switched through automatic transfer switches, and the load end is connected to the power end through the UPS in the data center, so that the mains power is supplied to the load.

[0004] When the neutral pole of the UPS is not connected to the neutral pole of any power supply, the neutral pole of the UPS will change relative to the ground potential for a short moment, which will have an adverse effect on the load equipment and even cause the load equipment such as servers to restart or data to be damaged. In order to achieve the situation where the neutral line is not disconnected during the conversion process, a separate neutral line overlapping unit needs to be set up.

[0005] The neutral line overlapping structure of the existing transfer switch electrical technology requires increasing the space above the neutral pole N phase or in the lateral direction, and at the same time cannot guarantee the opening distance, overtravel and final pressure of the neutral pole contact, and even affects the reset action and conversion speed of the mechanism, which is not conducive to the reliability design of the neutral line overlapping structure. At the same time, the volume and cost are high. Therefore, a neutral line overlapping conversion module of the transfer switch is needed. Summary of the invention

[0006] The object of the present invention is to provide a neutral line overlapping conversion module of a conversion switch to solve the problems in the prior art.

[0007] The purpose of the present invention can be achieved through the following technical solutions:

[0008] A neutral line overlapping conversion module of a conversion switch, the neutral line overlapping conversion module includes a rotating shaft sleeve, the neutral line overlapping conversion module is installed in the conversion switch, the conversion switch includes a shell, an arc rod is rotated on the rotating shaft sleeve, a fixed plate is rotated at one end of the arc rod, a straight rod three is fixed on the fixed plate, and a plurality of fixed plates are fixed on the positioning shaft.

[0009] A V-shaped block rotates in the shell, a straight rod four is fixed at one end of the V-shaped block, and a waist hole is provided at the other end. A moving contact is fixed on the straight rod four. A copper contact one is fixed in the shell, and a soft connecting wire connected to the moving contact is fixed on the copper contact one. Copper contact two is fixed in the shell and on both sides of the copper contact one.

[0010] Furthermore, one side of the shell is symmetrically provided with an arc groove 1, and one side of the shell is symmetrically provided with an arc groove 2. The shell is provided with threaded holes in an array, and the bolts are connected to the threaded holes.

[0011] The shell is provided with a pin groove, and a pin rod is fixed on the shell. The pin groove on one conversion switch matches with the pin rod on another conversion switch.

[0012] Furthermore, a through hole is symmetrically provided on one side of the shell, the through hole is coaxial with the arc groove, and an opening groove is symmetrically provided on the shell. The opening grooves on the two shells are connected to form a status indication window, and the opening groove is located above the through hole.

[0013] Furthermore, mounting grooves are provided at both ends of the shell, an arc-striking piece is fixed on the second copper contact, and the arc-striking piece and the second copper contact are located at the mounting grooves.

[0014] Furthermore, a rotating shaft sleeve rotates in the through hole, an indicator plate is fixed on the rotating shaft sleeve, the indicator plate is located at the status indication window, a connecting hole is provided at the axis of the rotating shaft sleeve, a side block is fixed on one side of the rotating shaft sleeve, a straight rod 1 rotates on the side block, an arc rod is symmetrically fixed on the straight rod 1, a straight rod 2 is fixed to one end of the arc rod, and the end of the straight rod 1 is slidably connected to the arc groove 1.

[0015] Furthermore, a positioning shaft is rotatably arranged in the shell, one end of the fixing plate is rotatably connected to the second straight rod, and the other end is fixed with the third straight rod.

[0016] Furthermore, a spring fixing sleeve is provided on the moving contact, a compression spring is fixed in the spring fixing sleeve, and the compression spring is fixed on 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, both ends of the rotating rod are rotatably connected to the shell, the straight rod four passes through a number of spring fixing sleeves, and the rotating rod passes through a number of moving contacts.

[0018] Furthermore, the flexible connecting wire is composed of a copper braided wire and an external load busbar.

[0019] Beneficial effects of the present invention:

[0020] 1. The neutral line overlapping conversion module of the present invention has the same spacing between the neutral pole N and other phases, which will not increase the space above and below, left and right, and front and back of the overall switch. The modular neutral line overlapping conversion module has a convenient structure for assembly and maintenance;

[0021] 2. In the neutral line overlap conversion module of the present invention, the rotating shaft sleeve is located at the status indication window, which can indicate the status, and its mark is eye-catching, which can accurately judge the contact opening and closing and overlapping position status;

[0022] 3. In the neutral line overlapping conversion module of the present invention, the articulation of multiple connecting rods makes the contact parameters of the neutral pole N in the overlapping state more stable and reliable. When the connecting rod structure opens the two-way switch mechanism, the main compression spring is released in the middle stage and the force value is relatively large and the N pole overlap is closed. Compared with the existing main compression spring which is released in the late stage and the force value is relatively small and the N pole overlap function is closed, the neutral pole contact pressure and overtravel are more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below in conjunction with the accompanying drawings.

[0024] Figure 1 It is a structural schematic diagram of the conversion switch of the present invention;

[0025] Figure 2 It is a schematic cross-sectional structure diagram of the transfer switch of the present invention;

[0026] Figure 3 It is a schematic diagram of the internal structure of the transfer switch of the present invention;

[0027] Figure 4 It is a partial structural schematic diagram of the neutral line overlapping conversion module of the present invention;

[0028] Figure 5 It is a schematic diagram of the internal structure of the transfer switch of the present invention;

[0029] Figure 6 The present invention Figure 6 The enlarged structural diagram at A in the middle;

[0030] Figure 7 It is a schematic diagram of the conversion and return of the N pole of the neutral line of the present invention;

[0031] Figure 8 It is a schematic diagram of overlapping contact groups of the neutral line N pole of the present invention.

[0032] The accompanying drawings are as follows:

[0033] 1. Shell; 2. Rotating shaft sleeve; 3. Arc rod; 4. V-shaped block; 5. Spring fixing sleeve; 6. Positioning shaft; 10. Copper contact one; 11. Arc groove one; 12. Arc groove two; 13. Threaded hole; 14. Open 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. Fixed plate; 34. Straight rod three; 41. Waist hole; 42. Rotating rod; 43. Straight rod four; 101. Flexible connecting wire; 102. Moving contact; 103. Arc-starting piece. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] A neutral line overlapping conversion module of a transfer switch, such as Figure 1-Figure 6 As shown, the switching switch includes a shell 1, one side of the shell 1 is provided with a symmetrically distributed arc groove 11, one side of the shell 1 is provided with a symmetrically distributed arc groove 2 12, the arc groove 11 is located above the arc groove 2 12, and the shell 1 is provided with an array of threaded holes 13, and bolts are connected to the threaded holes 13 to fix the shell 1.

[0036] A pin slot 16 is provided on the housing 1 , and a pin rod 17 is fixed on the housing 1 . Two adjacent conversion switches are installed in close proximity to form a modular conversion switch, and the pin slot 16 on one conversion switch cooperates with the pin rod 17 on the other conversion switch.

[0037] One side of the shell 1 is provided with symmetrically distributed through holes 15, which are coaxial with the arc groove 11. The shell 1 is provided with symmetrically distributed open grooves 14. After the two shells 1 are connected, the open grooves 14 thereon are connected correspondingly to form a status indication window for observing the indication. The open grooves 14 are located above the through holes 15.

[0038] Mounting grooves 18 are provided at both ends of the shell 1 for installing the arc extinguishing chamber. A copper contact 10 is fixedly provided in the shell 1, and a soft connecting wire 101 is fixedly provided on the copper contact 10. A moving contact 102 is fixedly provided on the end of the soft connecting wire 101 away from the copper contact 10. Copper contact 2 19 is fixedly provided in the shell 1 and on both sides of the copper contact 10. An arc-striking piece 103 is fixedly provided on the copper contact 2 19. The screw passes through the arc-striking piece 103 and the copper contact 2 19 and is threadedly connected to the shell 1. The arc-striking piece 103 and the copper contact 2 19 are located at the mounting groove 18.

[0039] After the moving contact 102 rotates, it can be connected to the copper contact 2 19 at the corresponding position, so that the copper contact 10 is connected to one copper contact 2 19, and vice versa, the copper contact 10 is connected to another copper contact 2 19, so as to realize the neutral line overlapping conversion operation of the conversion switch.

[0040] A rotating shaft sleeve 2 is rotatably disposed in the through hole 15, and an indicator plate 21 is fixedly disposed on the rotating shaft sleeve 2. The indicator plate 21 is located at the status indicator window. When the rotating shaft sleeve 2 rotates, the indicator plate 21 rotates, and the neutral line overlapping conversion state is displayed at the status indicator window.

[0041] A connecting hole 22 is opened at the axis center of the rotating shaft sleeve 2, and the cross-sectional shape of the connecting hole 22 is one of rectangular, circular, elliptical, and diamond-shaped. A side block 23 is fixedly provided on one side of the rotating shaft sleeve 2, and a straight rod 31 is rotatably connected to the side block 23. The straight rod 31 is fixedly provided with symmetrically distributed arc rods 3, and one end of the arc rod 3 away from the straight rod 31 is fixedly connected to the straight rod 2 32, and the end of the straight rod 31 is slidably connected to the arc groove 11.

[0042] A positioning shaft 6 is rotatably provided in the shell 1, and a plurality of 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 2 32, and the other end is fixedly provided with a straight rod 34. The positioning shaft 6 is connected to the straight rod 2 32 on both sides of the positioning shaft 6 through the fixing plates 33 symmetrically provided thereon, thereby realizing connection with the two rotating shaft sleeves 2, which is convenient for the neutral line overlapping conversion operation.

[0043] A spring fixing sleeve 5 is sleeved on the moving contact 102, and a compression spring is fixedly installed in the spring fixing sleeve 5, which is not shown in the figure. The compression spring is connected to the moving contact 102 to apply pressure to the moving contact 102. A V-shaped block 4 is fixedly provided on the side of the moving contact 102, and a rotating rod 42 is fixedly provided on the V-shaped block 4. Both ends of the rotating rod 42 are rotatably connected to the housing 1. A straight rod four 43 is fixedly provided at one end of the V-shaped block 4, and a waist hole 41 is opened at the other end. The straight rod four 43 passes through several spring fixing sleeves 5, and the rotating rod 42 passes through several moving contacts 102. The straight rod four 43 and the rotating rod 42 are used to fix and connect multiple moving contacts 102 in parallel, so as to stably connect the overlapping moving contacts 102.

[0044] The waist hole 41 is slidably connected with the straight rod three 34. When a rotating shaft sleeve 2 rotates, the arc rod 3 is used to drive the positioning shaft 6 and the fixed plate 33 thereon to rotate. During the rotation process of the fixed plate 33, the straight rod three 34 is used to slide in the waist hole 41 to drive the V-shaped block 4 to rotate on the rotating rod 42, so that the moving contact 102 rotates, and the straight rod four 43 is slidably connected with the arc groove two 12.

[0045] Here’s how it works:

[0046] The present invention adopts a single-phase (pole) modular execution transfer switch, including two incoming lines, a load-side outgoing line, and a driven rotating shaft sleeve 2, an arc rod 3, a V-shaped block 4, a positioning shaft 6, a moving contact system, an arc extinguishing chamber, etc. are integrated in an independent cavity. The moving contact group adopts multiple groups of moving contacts 102, and a compression spring and a spring fixing sleeve 5 are arranged above each moving contact 102, so that each contact has an independent pressure after closing;

[0047] The static contact components are fixed to the bottom of the housing by screws. The two moving contacts 102 use copper braided wires to form a soft connection structure with the external load busbar, and are arranged back to back on both sides to provide two independent arc extinguishing spaces, fundamentally avoiding the short circuit of the normal and standby arcs.

[0048] At the same time, in order to more accurately reflect the current contact position status, a status indication window is left on the front side of the transfer switch.

[0049] In order to realize the overlapping conversion of the neutral pole contacts, a three-link transmission is designed between the opening and closing rotation of the 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 common shaft drives the opening and closing of the spare contacts, and the rotation of the spare shaft drives the opening and closing of the common contacts.

[0050] like Figure 7 As shown in the figure, the action sequence is: when the common side is in the closed position, the N pole of the standby neutral line can obtain a larger opening distance. When the switch disconnects the common side, the N pole of the common neutral line does not move and remains connected; the N pole contact of the standby neutral line is driven to connect first, and then the standby phase line contact is closed, and the N pole contact of the common neutral line is disconnected at the same time; the steps are the same as those for switching to the common connection:

[0051] like Figure 8 As shown in the schematic diagram of the overlap of the neutral line N-pole contact group: during the conversion process, the ∠a angle becomes smaller, which drives the ∠b angle to become smaller, making the ∠c angle larger, and the contact is disconnected; on the contrary, the contact closing overlaps. It is not difficult to see that the three-link transmission during the closing and opening process is relatively labor-saving, and the force acting on the rotating shaft sleeve 2 is in the middle stage of the release of the main compression spring of the mechanism (when the force value is large), making the neutral line N-pole overlap more reliable;

[0052] At the same time, the advantages are: the angle of ∠c determines the overtravel and final pressure of the contact. In the actual production process, due to the cumulative errors of processing, the angles of ∠a and ∠b will be smaller than the design values. However, the angle of ∠c is smaller than the design values ​​because the waist hole connecting the end of the contact connecting rod tends to be horizontal, and the sliding surface of the waist hole 41 is tangent to the connecting pin shaft, and the cumulative tolerance change is small, so the pressure and overtravel acting on the contact are less affected, and the overlap is more reliable.

[0053] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A neutral line overlap conversion module of a transfer switch, the neutral line overlap conversion module comprising a rotating shaft sleeve (2), characterized in that: The neutral line overlap conversion module is installed in a conversion switch, which comprises a housing (1), an arc-shaped rod (3) is rotatably mounted on a rotating shaft sleeve (2), a fixing plate (33) is rotatably mounted on one end of the arc-shaped rod (3), a straight rod three (34) is fixedly connected to the fixing plate (33), and a plurality of fixing plates (33) are fixedly mounted on a positioning shaft (6); A V-shaped block (4) is rotated in the housing (1), a straight rod four (43) is fixed at one end of the V-shaped block (4), and a waist hole (41) is provided at the other end, a moving contact (102) is fixed on the straight rod four (43), a copper contact one (10) is fixed in the housing (1), a soft connecting wire (101) connected to the moving contact (102) is fixed on the copper contact one (10), and a copper contact two (19) is fixed in the housing (1) and located on both sides of the copper contact one (10).

2. The neutral line overlapping conversion module of a transfer switch according to claim 1, characterized in that: One side of the shell (1) is symmetrically provided with an arc groove 1 (11), and one side of the shell (1) is symmetrically provided with an arc groove 2 (12). The shell (1) is provided with threaded holes (13) in an array, and bolts are connected to the threaded holes (13). The housing (1) is provided with a pin groove (16), a pin rod (17) is fixed on the housing (1), and the pin groove (16) on one switching switch is matched with the pin rod (17) on another switching switch.

3. The neutral line overlapping conversion module of a conversion switch according to claim 1, characterized in that: A through hole (15) is symmetrically provided on one side of the shell (1), the through hole (15) being coaxial with the arc groove (11), and an opening groove (14) is symmetrically provided on the shell (1), the opening grooves (14) on the two shells (1) are connected to form a status indication window, and the opening groove (14) is located above the through hole (15).

4. The neutral line overlapping conversion module of a conversion switch according to claim 3, characterized in that: The housing (1) is provided with mounting grooves (18) at both ends, an arc-striking piece (103) is fixed on the second copper contact (19), and the arc-striking piece (103) and the second copper contact (19) are located at the mounting grooves (18).

5. The neutral line overlapping conversion module of a conversion switch according to claim 4, characterized in that: A rotating shaft sleeve (2) is rotatably arranged in the through hole (15), an indicating plate (21) is fixed on the rotating shaft sleeve (2), the indicating plate (21) is located at the status indicating window, a connecting hole (22) is arranged at the axis center of the rotating shaft sleeve (2), a side block (23) is fixed on one side of the rotating shaft sleeve (2), a straight rod 1 (31) is rotatably arranged on the side block (23), an arc-shaped rod (3) is symmetrically fixed on the straight rod 1 (31), a straight rod 2 (32) is fixedly connected to one end of the arc-shaped rod (3), and an end of the straight rod 1 (31) is slidably connected to the arc groove 1 (11).

6. The neutral line overlapping conversion module of a conversion switch according to claim 5, characterized in that: A positioning shaft (6) is rotatably arranged in the housing (1); one end of a fixing plate (33) is rotatably connected to a second straight rod (32); and a third straight rod (34) is fixed to the other end.

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

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

9. The neutral line overlapping conversion module of a conversion switch according to claim 1, characterized in that: The flexible connecting wire (101) is composed of a copper braided wire and an external load busbar.

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