SPD knife switch

Abstract

The invention discloses an SPD knife switch which comprises an insulating shell, a rotating rod and metal terminals, a terminal containing cavity is formed in the insulating shell, the two metal terminals are fixedly installed in the insulating shell in a spaced mode, contact arms and connecting pins are formed on the two metal terminals, the contact arms of the two metal terminals are contained in the terminal containing cavity in a spaced mode, and the connecting pins are connected with the rotating rod. The connecting pins of the two metal terminals can be electrically connected with two wires needing to be connected and conducted respectively, one end of a rotating rod made of an insulating material can be inserted into the terminal containing cavity in a manner of rotating by a set angle, and a metal protrusion is fixedly installed on the outer side wall of the circumference of one end of the rotating rod. When the rotating rod rotates to different angles, the metal protrusions on the rotating rod can be in close contact with the two metal terminals or be separated from at least one metal terminal at the same time, and a rotating operation end capable of being exposed out of the surface of the insulating shell is formed at the other end of the rotating rod. And the circuit connection stability is good.

Description

Technical Field

[0001] The invention relates to a switch, in particular to an SPD knife switch. Background Art

[0002] Existing surge protectors all use knife switches to realize the on-off control of the circuit. The common knife switch 100 is composed of a knife, a bracket, an insulating base, and a terminal. The knife is a metal plate or strip with an electrical contact. One end of the knife is hinged on the bracket. The bracket is connected to a line to realize the conduction between one end of the knife and the line. A handle is provided on the other end of the knife for turning the knife. When the knife is turned hard to rotate the electrical contact on it and contact the terminal, the conduction of the entire circuit is realized. When the knife is turned in the opposite direction, the electrical contact on the knife is separated from the terminal, and the entire circuit is disconnected.

[0003] At present, this traditional knife switch structure occupies a large space because the knife needs to swing forward and backward, and when it is vibrated, it is easy to cause the knife to swing and cause the circuit to be disconnected. Summary of the invention

[0004] In order to make up for the above shortcomings, the present invention provides an SPD knife switch, which has a simple structure, occupies a small space, is easy to operate, and will not cause circuit disconnection due to vibration.

[0005] The technical solution adopted by the present invention to solve its technical problems is: an SPD knife switch, including an insulating shell, a rotating rod and a metal terminal, a terminal accommodating cavity is formed in the insulating shell, two metal terminals are fixedly installed in the insulating shell at an interval, and contact arms and connecting pins are formed on the two metal terminals, the contact arms of the two metal terminals are accommodated in the terminal accommodating cavity at an interval, and the connecting pins of the two metal terminals can be electrically connected to two wires that need to be connected and conducted respectively, one end of the rotating rod made of insulating material can be rotated to a set angle and inserted into the terminal accommodating cavity, a metal protrusion is fixedly installed on the circumferential outer wall of one end of the rotating rod, and the rotating rod can be rotated to different angles so that the metal protrusion on it can be closely contacted with the two metal terminals at the same time for conduction or separated and disconnected from at least one metal terminal, and the other end of the rotating rod forms a rotating operating end that can be exposed on the surface of the insulating shell.

[0006] As a further improvement of the present invention, a mounting groove extending along the arrangement direction of its metal terminals is provided on the circumferential outer wall at one end of the rotating rod, and the metal protrusion is a long metal sheet, one end of the long metal sheet is fixedly inserted in the mounting groove, and the other end of the long metal sheet protrudes from the surface of the circumferential outer wall at one end of the rotating rod.

[0007] As a further improvement of the present invention, the two metal terminals are arranged at intervals along the axial direction of the rotating rod, and the installation groove on the side wall at one end of the rotating rod extends along the axial direction of the rotating rod. The two side walls of the installation groove along the thickness direction of the long metal sheet are respectively provided with inwardly convex interference ribs. One end of the long metal sheet is fixedly inserted in the installation groove by interference fit. The long metal sheet can be in close contact with the contact arms of the two metal terminals at the same time or separated from the contact arms of the two metal terminals at the same time as the rotating rod rotates.

[0008] As a further improvement of the present invention, the other end of the long metal sheet forms chamfered surfaces or rounded surfaces on both side edges along the circumferential direction of the rotating rod, and when the long metal sheet rotates with the rotating rod, it first contacts the two metal terminals through the chamfered surfaces or rounded surfaces.

[0009] As a further improvement of the present invention, a spiral cavity coaxially opposite to the terminal accommodating cavity is further provided in the insulating shell, the other end of the rotating rod is inserted into the spiral cavity, and the other end of the rotating rod is meshed and connected with the spiral cavity of the insulating shell through a spiral structure.

[0010] As a further improvement of the present invention, a radially outward convex limit ring is also provided on the circumferential outer wall of the rotating rod, and the radially outward convex limit ring stops on the outer walls opposite to the terminal accommodating cavity and the spiral cavity in the insulating shell to limit the axial movement distance of the spiral rod. The end of one end of the rotating rod is also provided with a guide column with a reduced diameter, and a guide slot is provided on the inner wall of the end of the terminal accommodating cavity facing away from the spiral cavity, and the guide column can be slidably inserted in the guide slot.

[0011] As a further improvement of the present invention, a countersunk structure is formed at one end of the spiral cavity facing away from the terminal accommodating cavity, and a head with an increased diameter is formed at the end of the other end of the rotating rod. The head can be completely accommodated in the countersunk structure, and the head at the other end of the rotating rod is stopped at the bottom surface of the countersunk structure, and a flower-shaped groove is provided on the end surface of the head at the other end of the rotating rod for hardware tools to be inserted and screwed.

[0012] As a further improvement of the present invention, the insulating shell includes an insulating body, a terminal accommodating cavity front cover, a terminal accommodating cavity rear cover, a terminal accommodating cavity inner frame, a spiral cavity front cover and a spiral cavity rear cover, the terminal accommodating cavity rear cover and the spiral cavity rear cover are fixedly installed on the insulating body at intervals, the terminal accommodating cavity front cover and the spiral cavity front cover can be fixedly installed on the terminal accommodating cavity rear cover and the spiral cavity rear cover respectively through a connecting piece or a snap structure, the spiral cavity rear cover and the spiral cavity front cover are spliced ​​to form a spiral cavity, the terminal accommodating cavity inner frame can be fixedly clamped between the terminal accommodating cavity front cover and the terminal accommodating cavity rear cover, the terminal accommodating cavity inner frame, the terminal accommodating cavity A terminal accommodating cavity is formed between the front cover of the cavity and the rear cover of the terminal accommodating cavity. A metal terminal positioning groove running through the cavity is provided on the side wall of the inner frame of the terminal accommodating cavity. A metal terminal positioning cavity is formed between the metal terminal positioning groove, the front cover of the terminal accommodating cavity and the rear cover of the terminal accommodating cavity. The metal terminal also includes a terminal body, which can be stopped and accommodated in the metal terminal positioning cavity. The contact arm and connecting foot of the metal terminal are respectively fixedly connected to the terminal body to form an integral structure, and notches are respectively formed on the side walls of the inner frame of the terminal accommodating cavity for the contact arm to extend into the terminal accommodating cavity and for the connecting foot to extend out of the outside of the insulating shell.

[0013] As a further improvement of the present invention, a "2"-shaped metal terminal positioning groove is formed on the side wall of the inner frame of the terminal accommodating cavity, and the contact arm is an elastic arm of a cantilever structure formed by bending from one end of the terminal body. The elastic arm can elastically swing along the radial direction of the rotating rod, and the connecting foot is integrally formed at the other end of the terminal body by bending.

[0014] As a further improvement of the present invention, the contact arm is bent to form a V-shaped structure, with one end of the V-shaped structure opening facing the inner wall of the inner frame of the terminal accommodating cavity, and the end of the free end is stopped on the surface of the inner wall of the inner frame of the terminal accommodating cavity, and the convex bent portion of the V-shaped structure of the contact arm forms a contact portion that contacts the metal protrusion on the rotating rod, and a guide surface with a chamfered structure or a convex arc structure is formed on the side wall of the contact arm along the rotation direction of the rotating rod, and the metal protrusion contact portion on the rotating rod first contacts the guide surface during rotation.

[0015] The beneficial technical effect of the present invention is as follows: the present invention fixes a metal protrusion on the outer arm of the circumference of the rotating rod, and the rotating rod is rotated by a certain angle so that the metal protrusion can contact the two metal terminals at the same time, thereby connecting the two metal terminals and thus connecting the entire circuit. When the rotating rod is rotated in the opposite direction, the metal protrusion on it is separated from one or two metal terminals, thereby disconnecting the entire circuit. The structure is simple, the rotating rod has a small rotating diameter, and occupies a small space, so it can be installed and used in a small space. Moreover, since the circuit is connected by the close contact between the metal protrusion on the outer wall of the circumference of the rotating rod and the two metal terminals, the rotating rod can be easily reversed to disconnect the circuit when vibrated, and the circuit connection stability is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the use state of the present invention;

[0017] Figure 2 It is the front view of the disconnected state of the present invention;

[0018] Figure 3 for Figure 2 Middle AA section view;

[0019] Figure 4 It is a front view of the closed state of the present invention;

[0020] Figure 5 for Figure 4 Middle BB section view;

[0021] Figure 6 This is a front view of the insulating housing of the present invention;

[0022] Figure 7 It is a front view of the rotating rod of the present invention;

[0023] Figure 8 for Figure 7 Middle CC section view;

[0024] Fig. 9 It is a left side view of the rotating rod of the present invention;

[0025] Fig.10 A top view of the rotating rod of the present invention;

[0026] Fig.11 A three-dimensional diagram of the rotating rod of the present invention;

[0027] Fig.12 It is a front view of the long strip metal sheet of the present invention;

[0028] Fig.13 It is a front view of the metal terminal of the present invention;

[0029] Fig.14It is a left side view of the metal terminal of the present invention;

[0030] Fig.15 It is a right side view of the metal terminal of the present invention. DETAILED DESCRIPTION

[0031] Embodiment: An SPD knife switch comprises an insulating shell 1, a rotating rod 2 and a metal terminal 3, wherein a terminal accommodating cavity 11 is formed in the insulating shell 1, two metal terminals 3 are fixedly installed in the insulating shell 1 at intervals, and contact arms 31 and connecting pins 32 are formed on the two metal terminals 3, the contact arms 31 of the two metal terminals 3 are accommodated in the terminal accommodating cavity 11 at intervals, and the connecting pins 32 of the two metal terminals 3 can be electrically connected to two wires that need to be connected and conducted, one end of the rotating rod 2 made of insulating material can be rotated to a set angle and inserted into the terminal accommodating cavity 11, a metal protrusion 21 is fixedly installed on the circumferential outer wall of one end of the rotating rod 2, and the rotating rod 2 can be rotated to different angles so that the metal protrusion 21 thereon can be in close contact with the two metal terminals 3 at the same time for conduction or separated and disconnected from at least one metal terminal 3, and the other end of the rotating rod 2 forms a rotating operating end that can be exposed from the surface of the insulating shell 1.

[0032] When in use, the rotating rod 2 is rotated, and when the metal protrusion 21 on the outer circumferential wall at one end thereof is not connected to one or both of the two metal terminals 3, the entire circuit is in a disconnected state; when the rotating rod 2 is rotated in the opposite direction, and when the metal protrusion 21 on the outer circumferential wall at one end thereof is connected to both metal terminals 3, the entire circuit is in a conducting state. The rotating rod 2 is preferably rotated within a range of 180° to achieve the switching between conducting and disconnecting. The rotating rod 2 of this structure does not occupy any additional external space during the rotation process, and can be installed and used in a small space. The rotating rod 2 rotates around a rotating shaft extending in a vertical direction to achieve simultaneous contact with the two metal terminals 3 for conducting or disconnection without simultaneous contact with the two metal terminals 3. The structure is simple in structure and easy to operate. The structure will not cause the rotating rod 2 to swing downward when subjected to vibration, resulting in abnormal disconnection of the circuit, which is conducive to ensuring the stability of the circuit connection.

[0033] The outer circumferential wall at one end of the rotating rod 2 is provided with a mounting groove 22 extending along the arrangement direction of its metal terminals 3. The metal protrusion 21 is a long strip of metal sheet. One end of the long strip of metal sheet is fixedly inserted in the mounting groove 22, and the other end of the long strip of metal sheet protrudes from the surface of the outer circumferential wall at one end of the rotating rod 2. By forming the metal protrusion 21 by embedding the long strip of metal sheet on the rotating rod 2, it can effectively ensure that the two metal terminals 3 are in contact at the same time, and this structure is convenient for fixing and positioning the metal protrusion 21 on the rotating rod 2. In addition, the metal block or metal sheet on the outer circumferential wall of the rotating rod 2 can also be fixed by a buckle or a connector, or the metal part formed on the side wall of the rotating rod 2 by in-mold injection molding. This type of equivalent replacement structure is easily conceivable by those skilled in the art based on the technical solution of this patent, and falls within the protection scope of this patent.

[0034] The two metal terminals 3 are arranged axially at intervals along the rotating rod 2. The mounting groove 22 on the side wall at one end of the rotating rod 2 extends axially along the rotating rod 2. The mounting groove 22 is provided with inwardly convex interference ribs 221 on both side walls along the thickness direction of the long metal sheet. One end of the long metal sheet is fixedly inserted in the mounting groove 22 by interference fit. The long metal sheet can be in close contact with the contact arms 31 of the two metal terminals 3 at the same time to be connected or separated from the contact arms 31 of the two metal terminals 3 at the same time as the rotating rod 2 rotates. The two metal terminals 3 are arranged vertically along the axis of the rotating rod 2, and the long metal sheet can be a straight sheet structure. When the rotating rod 2 rotates, it can contact the contact arms 31 of the two metal terminals 3 at the same time or separate from the contact arms 31 of the two metal terminals 3 at the same time. In addition, the two metal terminals 3 can also be arranged at intervals along the circumferential direction of the rotating rod 2, and the long metal sheet also forms an arc structure. During its rotation, it can contact the contact arm 31 of one metal terminal 3, or contact the contact arms 31 of two metal terminals 3. It can also be a spiral arrangement, etc. This type of equivalent replacement structure can be easily thought of by technical personnel in this field based on the technical solution of this patent, and belongs to the scope of protection of this patent.

[0035] The other end of the long metal sheet has chamfered or rounded surfaces 211 formed on both side edges along the circumference of the rotating rod 2 . When the long metal sheet rotates with the rotating rod 2 , the chamfered or rounded surfaces 211 first contact the two metal terminals 3 .

[0036] The insulating housing 1 is also provided with a spiral cavity 12 coaxially facing the terminal accommodating cavity 11, and the other end of the rotating rod 2 is inserted into the spiral cavity 12, and the other end of the rotating rod 2 is meshed and connected with the spiral cavity 12 of the insulating housing 1 through a spiral structure. A spiral groove 121 may be provided on the inner side wall of the spiral cavity 12, and a spiral protrusion 23 may be provided on the side wall of the other end of the rotating rod 2. The inner side wall of the spiral cavity 12 may also be a spiral protrusion, and the side wall of the other end of the rotating rod 2 may be a spiral groove. This is an equivalent replacement structure that can be easily thought of by those skilled in the art based on the technical solution of this patent, and falls within the scope of protection of this patent.

[0037] A radially outward convex stop ring 24 is also provided on the circumferential outer wall of the rotating rod 2. The radially outward convex stop ring 24 stops on the opposite outer walls of the terminal accommodating cavity 11 and the spiral cavity 12 in the insulating housing 1, thereby limiting the axial movement distance of the spiral rod. A guide column 25 with a contracted diameter is also provided at one end of the rotating rod 2. A guide slot is provided on the inner wall of the end of the terminal accommodating cavity 11 facing away from the spiral cavity 12, and the guide column 25 can be slidably inserted into the guide slot. The radially outward convex stop ring 24 moves up and down as the rotating rod 2 rotates in a spiral manner. When the rotating rod 2 rotates forward and backward to a limited angle, the radially outward convex stop ring 24 will be blocked by the outer walls of the terminal accommodating cavity 11 and the spiral cavity 12. At this time, the rotating rod 2 cannot continue to rotate, thereby forming a limit on the rotation angle of the rotating rod 2, so that the rotating rod 2 can only rotate forward and backward within the designed angle range to achieve the opening or closing of the circuit.

[0038] A countersunk structure 13 is formed at one end of the spiral cavity 12 facing away from the terminal accommodating cavity 11, and a head 26 with an increased diameter is formed at the end of the other end of the rotating rod 2. The head 26 can be completely accommodated in the countersunk structure 13, and the head 26 at the other end of the rotating rod 2 is stopped at the bottom surface of the countersunk structure 13, and a flower-shaped groove 261 is provided on the end surface of the head 26 at the other end of the rotating rod 2 for hardware tools to be inserted and screwed. The rotating rod 2 rotates to separate the metal protrusion 21 thereon from the metal terminal 3. When the circuit is disconnected, the spiral structure causes the rotating rod 2 to move axially, causing the head 26 at the other end to protrude to the outside of the insulating shell 1. The rotating rod 2 rotates in the opposite direction until the metal protrusion 21 thereon contacts the metal terminal 3. When the circuit is closed, the head 26 at the other end sinks into the countersunk structure 13 of the insulating shell 1. By observing whether the head 26 at the other end of the rotating rod 2 protrudes from the surface of the insulating shell 1 or is completely sunk into the insulating shell 1, it is possible to determine whether the circuit is in the on state or the off state at this time, which is convenient for users to determine the state of the knife switch.

[0039] The insulating housing 1 comprises an insulating body, a front cover of a terminal accommodating cavity 11, a rear cover of the terminal accommodating cavity 11, an inner frame of the terminal accommodating cavity 11, a front cover of a spiral cavity 12 and a rear cover of the spiral cavity 12. The rear cover of the terminal accommodating cavity 11 and the rear cover of the spiral cavity 12 are fixedly installed on the insulating body at intervals. The front cover of the terminal accommodating cavity 11 and the front cover of the spiral cavity 12 can be fixedly installed on the rear cover of the terminal accommodating cavity 11 and the rear cover of the spiral cavity 12 respectively through a connecting piece or a snap-on structure. The rear cover of the spiral cavity 12 and the front cover of the spiral cavity 12 are spliced ​​to form a spiral cavity 12. The inner frame of the terminal accommodating cavity 11 can be fixedly clamped between the front cover of the terminal accommodating cavity 11 and the rear cover of the terminal accommodating cavity 11. The inner frame of the terminal accommodating cavity 11 and the rear cover of the terminal accommodating cavity 11 The front cover and the rear cover of the terminal accommodating cavity 11 jointly form the terminal accommodating cavity 11, and the inner frame side wall of the terminal accommodating cavity 11 is provided with a metal terminal positioning groove that penetrates from front to back, and the metal terminal positioning groove, the front cover of the terminal accommodating cavity 11 and the rear cover of the terminal accommodating cavity 11 jointly form a metal terminal positioning cavity, and the metal terminal 3 also includes a terminal body 33, and the terminal body 33 can be stopped and accommodated in the metal terminal positioning cavity, and the contact arm 31 and the connecting foot 32 of the metal terminal 3 are respectively fixedly connected with the terminal body 33 to form an integral structure, and the inner frame side wall of the terminal accommodating cavity 11 is respectively formed with a notch for the contact arm 31 to extend into the terminal accommodating cavity 11 and for the connecting foot 32 to extend out of the outside of the insulating housing 1. The insulating housing 1 adopts a split assembly structure, which is convenient for the assembly and positioning of the rotating rod 2 and the metal terminal 3, and convenient for injection molding of the insulating housing 1.

[0040] A "2"-shaped metal terminal positioning groove is formed on the side wall of the inner frame of the terminal accommodating cavity 11. The contact arm 31 is an elastic arm of a cantilever structure formed by bending from one end of the terminal body 33. The elastic arm can elastically swing along the radial direction of the rotating rod 2. The connecting foot 32 is integrally formed at the other end of the terminal body 33 by bending. The contact arm 31 of the metal terminal 3 adopts an elastic cantilever structure, so that it can elastically swing in the radial direction of the rotating rod 2, which can ensure that the metal protrusion 21 on the rotating rod 2 smoothly contacts the contact arm 31, and the two are tightly connected after contact.

[0041] The contact arm 31 is bent to form a V-shaped structure, with one open end of the V-shaped structure facing the inner wall of the inner frame of the terminal accommodating cavity 11, and the end of the free end is stopped on the surface of the inner wall of the inner frame of the terminal accommodating cavity 11. The convex bent portion of the V-shaped structure of the contact arm 31 forms a contact portion that contacts the metal protrusion 21 on the rotating rod 2. A guide surface 311 with a chamfered structure or a convex arc structure is formed on the side wall of the contact arm 31 along the rotation direction of the rotating rod 2. The contact portion of the metal protrusion 21 on the rotating rod 2 first contacts the guide surface 311 during rotation.

Claims

1. An SPD knife switch, characterized in that: The invention comprises an insulating shell (1), a rotating rod (2) and a metal terminal (3), wherein a terminal accommodating cavity (11) is formed in the insulating shell, two metal terminals are fixedly installed in the insulating shell at an interval, and contact arms (31) and connecting pins (32) are formed on the two metal terminals, the contact arms of the two metal terminals are accommodated in the terminal accommodating cavity at an interval, and the connecting pins of the two metal terminals can be electrically connected to two wires that need to be connected and conducted respectively, one end of the rotating rod made of insulating material can be rotated to a set angle and inserted into the terminal accommodating cavity, a metal protrusion (21) is fixedly installed on the circumferential outer wall of one end of the rotating rod, and the rotating rod can be rotated to different angles so that the metal protrusion on the rod can be in close contact with the two metal terminals at the same time for conduction or separated from at least one metal terminal, and the other end of the rotating rod forms a rotating operating end that can be exposed from the surface of the insulating shell.

2. The SPD knife switch according to claim 1 is characterized in that: A mounting groove (22) extending along the arrangement direction of the metal terminals is provided on the circumferential outer wall of one end of the rotating rod, and the metal protrusion is a long strip of metal sheet, one end of the long strip of metal sheet is fixedly inserted in the mounting groove, and the other end of the long strip of metal sheet protrudes from the surface of the circumferential outer wall of one end of the rotating rod.

3. The SPD knife switch according to claim 2 is characterized by: The two metal terminals are arranged at intervals along the axial direction of the rotating rod, and the installation groove on the side wall of one end of the rotating rod extends along the axial direction of the rotating rod. The two side walls of the installation groove along the thickness direction of the long strip metal sheet are respectively provided with inwardly convex interference ribs (221), and one end of the long strip metal sheet is fixedly inserted in the installation groove by interference fit. The long strip metal sheet can be in close contact with the contact arms of the two metal terminals at the same time to be connected or separated from the contact arms of the two metal terminals at the same time as the rotating rod rotates.

4. The SPD knife switch according to claim 2 is characterized by: The other end of the long strip metal sheet is formed with chamfered surfaces or rounded surfaces (211) on both side edges along the circumference of the rotating rod. When the long strip metal sheet rotates with the rotating rod, it first contacts the two metal terminals through the chamfered surfaces or rounded surfaces.

5. The SPD knife switch according to claim 1 is characterized in that: The insulating housing is also provided with a spiral cavity (12) coaxially facing the terminal accommodating cavity, the other end of the rotating rod is inserted into the spiral cavity, and the other end of the rotating rod is meshedly connected with the spiral cavity of the insulating housing through a spiral structure.

6. The SPD knife switch according to claim 5, characterized in that: A radially outwardly convex stop ring (24) is also provided on the circumferential outer wall of the rotating rod, and the radially outwardly convex stop ring stops on the outer walls opposite to the terminal accommodating cavity and the spiral cavity in the insulating shell, thereby limiting the axial movement distance of the spiral rod. A guide column (25) with a contracted diameter is also provided at the end of one end of the rotating rod, and a guide slot is provided on the inner wall of the end of the terminal accommodating cavity facing away from the spiral cavity, and the guide column can be slidably inserted into the guide slot.

7. The SPD knife switch according to claim 5 is characterized by: A countersunk structure (13) is formed at one end of the spiral cavity facing away from the terminal accommodating cavity, and a head (26) with an increased diameter is formed at the end of the other end of the rotating rod. The head can be completely accommodated in the countersunk structure, and the head at the other end of the rotating rod stops at the bottom surface of the countersunk structure. A flower-shaped groove (261) for hardware tools to be inserted and screwed is provided on the end surface of the head at the other end of the rotating rod.

8. The SPD knife switch according to claim 5, characterized in that: The insulating shell comprises an insulating body, a terminal accommodating cavity front cover, a terminal accommodating cavity rear cover, a terminal accommodating cavity inner frame, a spiral cavity front cover and a spiral cavity rear cover, wherein the terminal accommodating cavity rear cover and the spiral cavity rear cover are fixedly installed on the insulating body at intervals, the terminal accommodating cavity front cover and the spiral cavity front cover can be fixedly installed on the terminal accommodating cavity rear cover and the spiral cavity rear cover respectively through a connecting piece or a snap-on structure, the spiral cavity rear cover and the spiral cavity front cover are spliced ​​to form a spiral cavity, the terminal accommodating cavity inner frame can be fixedly clamped between the terminal accommodating cavity front cover and the terminal accommodating cavity rear cover, the terminal accommodating cavity inner frame, the terminal accommodating cavity front cover and the terminal accommodating cavity A terminal accommodating cavity is formed between the rear cover and the terminal accommodating cavity, and a metal terminal positioning groove is provided on the side wall of the inner frame of the terminal accommodating cavity, and a metal terminal positioning cavity (14) is formed between the metal terminal positioning groove, the front cover of the terminal accommodating cavity and the rear cover of the terminal accommodating cavity. The metal terminal also includes a terminal body (33), and the terminal body can be stopped and accommodated in the metal terminal positioning cavity. The contact arm and the connecting foot of the metal terminal are respectively fixedly connected to the terminal body to form an integrated structure, and the side wall of the inner frame of the terminal accommodating cavity is respectively formed with a notch for the contact arm to extend into the terminal accommodating cavity and for the connecting foot to extend out of the outside of the insulating shell.

9. The SPD knife switch according to claim 8, characterized in that: A "2"-shaped metal terminal positioning groove is formed on the side wall of the inner frame of the terminal accommodating cavity. The contact arm is an elastic arm of a cantilever structure formed by bending from one end of the terminal body. The elastic arm can elastically swing along the radial direction of the rotating rod. The connecting foot is integrally formed at the other end of the terminal body by bending.

10. The SPD knife switch according to claim 9, characterized in that: The contact arm is bent to form a V-shaped structure, with one end of the V-shaped structure opening facing the inner wall of the terminal accommodating cavity inner frame, and the end of the free end is stopped on the surface of the inner wall of the terminal accommodating cavity inner frame, and the convex bent portion of the V-shaped structure of the contact arm forms a contact portion that contacts the metal protrusion on the rotating rod, and a guide surface (311) with a chamfered structure or a convex arc structure is formed on the side wall of the contact arm along the rotation direction of the rotating rod, and the metal protrusion contact portion on the rotating rod first contacts the guide surface during the rotation process.

Images