Grounding knife middle load switch combined electrical apparatus

Abstract

The application discloses a ground knife middle-placed load switch combined electric appliance, which comprises a rack, which is a shared support frame of a load switch and a ground switch; the load switch comprises a switch body, an upper contact assembly and a lower contact assembly; the lower contact assembly is electrically connected with the switch body; a conductive cylinder of the switch body can be lifted and displaced and is electrically connected with or disconnected from the upper contact assembly to form a closing or opening state of a main circuit; when the opening state is formed, a part of the conductive cylinder close to the upper contact assembly is exposed to form a grounding effect part; the ground switch is arranged between the upper contact assembly and the conductive cylinder; when the opening state is formed, the ground switch is electrically connected with the grounding effect part of the conductive cylinder to form a grounding circuit. The ground switch is arranged on the inner side of the load switch to form a middle-placed structure, the longitudinal length of the switch is shortened, and the application has the advantages of reasonable structure, safety and reliability.

Description

TECHNICAL FIELD

[0001] The application discloses a ground knife middle-mounted load switch combined electrical appliance, and belongs to the technical field of electrical appliances according to the international patent classification (IPC). BACKGROUND

[0002] The load switch electrical appliance is generally used in cooperation with an electrical cabinet, and the existing load switch electrical appliance with a ground knife is matched with a knife seat, wherein the knife seat is fixedly installed at the bottom end of the load switch, and the matched ground knife is also arranged below the load switch, so that the longitudinal size of the load switch is relatively large, and a relatively large longitudinal space of the electrical cabinet is required. The load switch electrical appliance with the above structure mode is not suitable for installation in some electrical cabinets with limited installation space. Therefore, the technical personnel in the field urgently need to develop a matched switch electrical appliance, and thus the application is proposed. SUMMARY

[0003] In view of the defects of the prior art, the application provides a ground knife middle-mounted load switch combined electrical appliance, which changes the switch layout, makes the overall structure more reasonable, and reduces the longitudinal size to adapt to more application environments.

[0004] To achieve the above object, the application is implemented by the following technical scheme.

[0005] A ground knife middle-mounted load switch combined electrical appliance comprises:

[0006] a rack which is a shared support frame of the load switch and the ground switch;

[0007] the load switch comprises a switch body, an upper contact assembly and a lower contact assembly, the lower contact assembly is electrically connected with the switch body, a conductive part of the switch body can be lifted and displaced and is electrically connected with or disconnected from the upper contact assembly to form a closing or opening state of a main circuit, and when the opening state, the conductive part is partially exposed at one end close to the upper contact assembly to form a grounding action part;

[0008] the ground switch is arranged between the upper contact assembly and the conductive part, and when the load switch is in the opening state, the ground switch is electrically connected with the grounding action part of the conductive part to form a grounding circuit.

[0009] Further, the load switch is a three-group air pressure type load switch and forms three-phase connection poles, and the corresponding ground switch is also a three-group, each air pressure type load switch comprises a conductive cylinder, the conductive cylinder can be lifted and displaced along an axis and is electrically connected with the corresponding upper contact, and a side wall at the top of the conductive cylinder forms the grounding action part.

[0010] Furthermore, the grounding switch includes a grounding knife clamp, a contact compression spring and a grounding transmission shaft. The grounding knife clamp passes through a horizontal axis near the head. A contact compression spring is provided on the horizontal axis and on the outside of the grounding knife clamp so that the grounding knife clamp can be tightly pressed against the grounding action part. The grounding knife clamp is fixed to the grounding transmission shaft through a grounding crank arm. The grounding transmission shaft is installed on the frame through a fixing seat. One end of the grounding transmission shaft is connected to the electrical operating mechanism. The grounding knife clamp is electrically connected to the grounding copper busbar through a flexible connection. The grounding copper busbar is fixed to the frame. The conductive part of the load switch, the grounding knife clamp, the flexible connection, the grounding copper busbar, and the reliably grounded frame form a grounding loop current path.

[0011] Furthermore, the grounding transmission shaft is substantially flush with the grounding function portion of the conductive cylinder when the compressed air load switch is opened.

[0012] Furthermore, a grounding switch limit plate is provided on the grounding transmission shaft, and the grounding switch limit plate rotates synchronously with the grounding transmission shaft. A corresponding limit groove is provided on the shell wall of the frame, and the top of the limit groove is the grounding closing limit end.

[0013] Furthermore, when the grounding drive shaft rotates, the grounding switch moves away from the main circuit of the load switch to form a grounding switch off state. A protrusion is provided on one side of the grounding crank arm, and the top surface of the protrusion is a limit surface. When the grounding switch is in the off state, the limit surface of the grounding crank arm contacts the side wall of the frame to form a limit. The grounding knife clamp of the grounding switch is close to the side wall of the frame and an electrical gap is met between it and the conductive tube of the load switch.

[0014] Furthermore, the upper contact assembly includes a static contact and a matching upper support. The static contact is fixed to the frame via the upper support. The load switch is fixed to the frame via the middle support and the lower support. A grounding switch rotation space is formed between the upper support and the middle support.

[0015] Furthermore, a main transmission shaft is provided on the frame, and the main transmission shaft controls the load switch to close and open the switch through a transmission mechanism. The transmission mechanism includes a first crank arm, a linkage rod, and a second crank arm connected in sequence. The second crank arm is fixed on the isolation transmission shaft. The main transmission shaft and the isolation transmission shaft are installed on the frame. A grounding transmission shaft is installed above the main transmission shaft of the frame. A grounding knife clamp is provided on the grounding transmission shaft. The grounding transmission shaft, the main transmission shaft, and the isolation transmission shaft are arranged from top to bottom.

[0016] The grounding switch and load switch share a common housing. The grounding switch is secured to the housing via a mounting bracket and can rotate under the constraints of the mounting bracket and bearings to open and close the grounding switch. The grounding switch is positioned inside the load switch, creating a centrally mounted design that reduces the overall longitudinal length of the switch. This design offers advantages such as a rational structure, safety, reliability, and adaptability to a wide range of installations. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1is a closing schematic view of the grounding switch according to an embodiment of the present application.

[0018] Fig. 2 is a closing side view of the grounding switch according to an embodiment of the present application.

[0019] Fig. 3 is an opening schematic view of the grounding switch according to an embodiment of the present application.

[0020] Fig. 4 is an opening front view of the grounding switch according to an embodiment of the present application.

[0021] Fig. 5 is an opening schematic view of the load switch according to an embodiment of the present application.

[0022] Fig. 6 is a closing schematic view of the load switch according to an embodiment of the present application.

[0023] Figure 7 is another schematic view of the structure according to an embodiment of the present application.

[0024] Figure 8 is a schematic view of the assembly of the grounding switch and the rack according to an embodiment of the present application.

[0025] Figure 9 is a front view of the assembly of the grounding switch and the rack according to an embodiment of the present application.

[0026] Figure 10 is a schematic view of the grounding switch according to an embodiment of the present application.

[0027] Figure 11 is a top view of the grounding switch according to an embodiment of the present application.

[0028] In the drawings, the components represented by the reference numerals are listed as follows:

[0029] 1, rack; 2, load switch; (201, 202, 203), three-phase pole; 21, body; 211, conductive cylinder; 212, middle support; 213, lower support; 22, upper contact assembly; 221, upper support; 23, lower contact assembly; 3, grounding switch; 31, grounding knife clamp; 32, contact compression spring; 33, grounding transmission shaft; 331, grounding switch limiting plate; 34, cross shaft; 35, grounding crank arm; 351, protrusion; 36, fixing seat; 37, grounding flexible connection; 38, grounding copper bar; 4, main transmission shaft; 51, first crank arm; 52, linkage rod; 53, second crank arm; 6, isolation transmission shaft. DETAILED DESCRIPTION

[0030] The present application will be further described below in conjunction with the drawings:

[0031] Embodiment: please refer to Figures 1 to 11The application relates to a ground knife middle-mounted load switch combined electric appliance, which comprises a rack 1, a load switch 2 and a ground switch 3; the rack 1 is a shared support frame of the load switch 2 and the ground switch 3; the load switch 2 comprises a switch body 21, an upper contact assembly 22 and a lower contact assembly 23; the lower contact assembly 23 is electrically connected with the switch body 21; as shown in Figs. 5 and 6, a conductive part of the switch body 21 can be lifted and displaced and is electrically connected with or disconnected from the upper contact assembly 22 to form a closed or opened state of a main circuit; as shown in Fig. 5, when the load switch is in an opened state, an end part of the conductive part close to the upper contact assembly 22 is exposed to form a grounding part; the ground switch 3 is arranged between the upper contact assembly 22 and the conductive part; when the load switch is in an opened state, the ground switch 3 is electrically connected with the grounding part of the conductive part to form a grounding circuit, as shown in Figs. 1 and 2.

[0032] In an embodiment of the application, as shown in Figs. 1 and 3, the load switch 2 is a three-group air-pressure type load switch and forms three-phase connection poles (201, 202 and 203); the corresponding ground switch 3 is also a three-group; each air-pressure type load switch comprises a conductive cylinder 211 which is a conductive part of the load switch; the conductive cylinder 211 can be lifted and displaced along an axis to be electrically connected with a corresponding upper contact; a top side wall of the conductive cylinder 211 forms a grounding part; the conductive cylinder of the air-pressure type load switch serves as a main circuit conductive unit and can form a break with the upper contact; as shown in Fig. 5, when the load switch is in an opened state, the break can be seen; as shown in Fig. 6, when the load switch is in a closed state, the break is connected.

[0033] In an embodiment of the application, as shown in Figs. 7 to Figure 11 The ground switch 3 comprises a ground knife clamp 31, a contact compression spring 32 and a ground transmission shaft 33; the ground knife clamp 31 penetrates a horizontal shaft 34 close to a head part; the contact compression spring 32 is arranged on the horizontal shaft 34 and located at the outer side of the ground knife clamp so that the ground knife clamp 31 can be tightly pressed on the grounding part; the ground knife clamp 31 is fixed on the ground transmission shaft 33 through a ground crank 35; the ground transmission shaft 33 is installed on the rack 1 through a fixing base 36; one end of the ground transmission shaft 33 is connected with an electric appliance operating mechanism; the ground knife clamp 31 is electrically connected with a ground copper bar 38 through a soft connection 37; the ground copper bar 38 is fixed on the rack 1; the conductive part or the conductive cylinder 211 of the load switch, the ground knife clamp 31, the soft connection 37, the ground copper bar 38 and the rack 1 which can be reliably grounded form a grounding circuit current path. The ground transmission shaft 33 is substantially level with the grounding part of the conductive cylinder 211 when the air-pressure type load switch is opened, as shown in Fig. 2.

[0034] In an embodiment of the application, the rotation limiting structure of the ground switch is arranged as follows: as shown in Figs. 7 and 8, Figure 10The ground switch limiting plate 331 rotates synchronously with the ground transmission shaft, the corresponding limiting recess 101 is arranged on the shell wall of the frame, and the top end of the limiting recess is a ground closing limiting end; as shown in Figures 3 and 4, the ground switch 3 is away from the main circuit of the load switch under the rotation of the ground transmission shaft to form a ground switch opening state, the convex 351 is arranged on one side of the ground crank arm 35, and the top end surface of the convex is a limiting surface; when the ground switch is in the opening state, the limiting surface of the ground crank arm 35 is limited by the side wall of the frame, and the ground knife holder 31 of the ground switch 3 is close to the side wall of the frame and satisfies the electrical gap with the conductive cylinder 211 of the load switch. Figure 10

[0035] In an embodiment of the present application, the upper contact assembly 22 comprises a static contact and a matched upper support 221, the static contact is fixed on the frame through the upper support 221, and the switch body 21 of the load switch is fixed on the frame through the intermediate support 212 and the lower support 212, the upper support 221 and the intermediate support 212 form a ground switch rotating space, as shown in Figures 2 and 3.

[0036] In an embodiment of the present application, as shown in Figures 1, 3, 7 and 8, the frame 1 is provided with a main transmission shaft 4, the main transmission shaft 4 controls the closing and opening of the load switch through a transmission mechanism, the transmission mechanism comprises a first crank arm 51, a linkage rod 52 and a second crank arm 53 connected in sequence, the second crank arm 53 is fixed on the isolation transmission shaft 6, the second crank arm 53 extends to the load switch, the main transmission shaft 4 and the isolation transmission shaft 6 are installed on the frame 1, the ground transmission shaft 33 is installed above the main transmission shaft 4 of the frame 1, the ground switch 3 is sleeved on the ground transmission shaft 33, and the ground transmission shaft 33, the main transmission shaft 4 and the isolation transmission shaft 6 are arranged from top to bottom.

[0037] The ground switch 3 and the load switch 2 share one frame, the ground switch 3 is fixed on the frame 1 through a fixing seat and can rotate under the constraint of the fixing seat 36 and a bearing, so as to realize the opening and closing of the ground knife.

[0038] ​The load switch and ground switch combination electric appliance for environmental protection gas cabinet is a compressed gas load switch and ground switch combination, wherein the load switch adopts arc extinguishing mode of compressed gas blowing out arc; the conductive cylinder of the compressed gas load switch can be moved up and down along the axis to realize the connection and disconnection of the upper and lower contact parts; the ground loop current path, the conductive cylinder 211, the ground knife clamp 31, the soft connection 37 and the ground copper bar 38 are grounded through the rack or the shell. The main loop part of the application includes the load switch conductive cylinder part, the upper contact part and the lower contact part; the ground switch rotates through the ground transmission shaft, the ground knife body is away from the main loop part, the electrical gap requirement is met, and the opening state of the ground switch is realized. The ground switch is arranged on the inner side of the load switch to form a center-mounted structure, and the longitudinal length of the switch is reduced.

[0039] The above is only an embodiment of the application, and any modification or change made by those skilled in the art using the application is within the scope of the application, and is not limited to the embodiments disclosed.

Claims

1. A grounding knife mid-mounted load switch combination electrical appliance, characterized in that include: A frame (1) which is a common support frame for a load switch (2) and a grounding switch (3); A load switch (2) comprises a switch body (21), an upper contact assembly (22) and a lower contact assembly (23); the lower contact assembly (23) is electrically connected to the switch body (21); a conductive member of the switch body (21) can be lifted and displaced and electrically connected or disconnected with the upper contact assembly (22) to form a closed or open state of the main circuit; when the load switch (2) is in the open state, one end of the conductive member close to the upper contact assembly (22) is exposed to form a grounding function portion; A grounding switch (3) is provided between the upper contact assembly (22) and the conductive member, and when the load switch (2) is in an open state, the grounding switch (3) is electrically connected to the grounding function portion of the conductive cylinder (211) to form a grounding loop; The grounding switch (3) includes a grounding knife clamp (31), a contact pressure spring (32) and a grounding transmission shaft (33). The grounding knife clamp (31) passes through a transverse axis (34) near the head. A contact pressure spring (32) is provided on the transverse axis (34) and located outside the grounding knife clamp (31) so that the grounding knife clamp (31) can be pressed tightly against the grounding action part. The grounding knife clamp (31) is fixed to the grounding transmission shaft (33) through a grounding arm (35). The grounding transmission shaft (33) is installed on the frame (1) through a fixing seat (36). One end of the grounding transmission shaft (33) is connected to the electrical operating mechanism. The grounding knife clamp (31) is electrically connected to the grounding copper bar (38) through a flexible connection. The grounding copper bar (38) is fixed on the frame (1). The conductive part of the load switch (2), the grounding knife clamp (31), the flexible connection, the grounding copper bar (38) and the reliably grounded frame (1) form a grounding loop current path. A grounding switch (3) limit plate is provided on the grounding transmission shaft (33), and the grounding switch (3) limit plate rotates synchronously with the grounding transmission shaft (33). A corresponding limit groove is provided on the shell wall of the frame (1), and the top of the limit groove is a grounding closing limit end; The grounding switch (3) is rotated away from the main circuit of the load switch (2) by the grounding transmission shaft (33), and the grounding switch (3) is in an off-state. A protrusion (351) is provided on one side of the grounding crank arm (35), and the top surface of the protrusion (351) is a limit surface. When the grounding switch (3) is in the off-state, the limit surface of the grounding crank arm (35) contacts the side wall of the frame (1) to form a limit. The grounding knife clamp (31) of the grounding switch (3) is close to the side wall of the frame (1) and an electrical gap is satisfied between the grounding knife clamp (31) and the conductive cylinder (211) of the load switch (2).

2. The grounding switch center-mounted load switch combination electrical appliance according to claim 1, characterized in that: The load switches (2) are three groups of compressed air load switches (2) and form a three-phase connection pole. The corresponding grounding switches (3) are three groups. Each compressed air load switch (2) includes a conductive cylinder (211). The conductive cylinder (211) can move vertically along an axis to be electrically connected to a corresponding upper contact. The top side wall of the conductive cylinder (211) forms a grounding action portion.

3. The grounding switch center-mounted load switch combination electrical appliance according to claim 1, characterized in that: The grounding transmission shaft (33) is substantially flush with the grounding action portion of the conductive tube (211) when the compressed air load switch (2) is opened.

4. The grounding switch center-mounted load switch combination electrical appliance according to claim 1, characterized in that: The upper contact assembly (22) includes a static contact and a matching upper support (221). The static contact is fixed to the frame (1) via the upper support (221). The load switch (2) is fixed to the frame (1) via the intermediate support and the lower support (213). A rotation space for the grounding switch (3) is formed between the upper support (221) and the intermediate support.

5. The grounding switch center-mounted load switch combination electrical appliance according to claim 1, characterized in that: A main transmission shaft (4) is provided on the frame (1). The main transmission shaft (4) controls the load switch (2) to close and open the switch through a transmission mechanism. The transmission mechanism comprises a first crank arm (51), a linkage rod (52), and a second crank arm (53) connected in sequence. The second crank arm (53) is fixed on the isolation transmission shaft (6). The main transmission shaft (4) and the isolation transmission shaft (6) are installed on the frame (1). A grounding transmission shaft (33) is installed above the main transmission shaft (4) of the frame (1). A grounding knife clamp (31) is sleeved on the grounding transmission shaft (33). The grounding transmission shaft (33), the main transmission shaft (4), and the isolation transmission shaft (6) are arranged from top to bottom.

Images