Switchgear and its door lock device

Abstract

The application discloses a switch cabinet door lock device, which comprises a lock sleeve and a lock core. A hollow cavity is formed on the inner wall of the lock sleeve; the lock core is inserted into the cavity of the lock sleeve, and the first end of the lock core is connected with the inner wall of the lock sleeve in a clamping mode. The second end of the lock core protrudes from the lock sleeve and is used for being connected with the switch cabinet. A convex ring is formed on the inner wall of the lock sleeve, and the side of the convex ring facing the central axis of the lock sleeve is a bevel, the distance of the bevel to the outer wall of the lock sleeve gradually increases along the direction of the insertion of the lock core, and the lock core has an inclined matching surface matched with the bevel. The lock sleeve and the lock core of the switch cabinet door lock device in the application are abutted at an inclined angle, so that the stress of arc impact is dispersed, and the mechanical strength of the lock core and the lock sleeve is improved. In addition, the application further discloses a switch cabinet, and the locking of the cabinet body and the cabinet door is realized by using the above-mentioned door lock device.

Description

Technical Field

[0001] This invention relates to the field of switch cabinets, and particularly to a switch cabinet and its door lock device. Background Technology

[0002] To ensure the safety performance of switchgear, power transmission and distribution equipment typically includes switchgear door locks between the switchgear door and the cabinet body. Currently, both the State Grid and general industrial users require switchgear to meet the Internal Arc Class (IAC) requirements, meaning the switchgear must pass an internal arc test (arc test). When an internal fault occurs, the pressure released by the generated arc can cause a significant mechanical impact on the switchgear within the enclosed space of the equipment. If the sealing strength of the front and rear doors of the switchgear is insufficient to withstand this pressure, pressure shock waves and hot gases generated by the arc can be ejected from the equipment, posing a hazard to operators and potentially endangering their lives.

[0003] The commonly used fixed mode of switch cabinet door lock device is the mode of hinge on one end and door lock on the other end (which can be opened). Currently, the mechanical strength of commonly used door lock devices on the market does not meet the IAC level requirements, which is the weak point of the entire switch cabinet. They are particularly easy to be damaged by impact during arcing tests, thus failing to meet the requirements of internal arcing tests. Summary of the Invention

[0004] To address the problem that switchgear door lock devices in related technologies are easily damaged by impact during arcing tests and cannot meet the requirements of internal arcing tests, this invention provides a switchgear and its door lock device with high mechanical strength, which meets the IAC level requirements and satisfies the requirements of internal arcing tests.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] On one hand, the present invention provides a switch cabinet door lock device, characterized in that it comprises:

[0007] A locking sleeve having a hollow cavity formed therein; and

[0008] A lock cylinder is inserted into the cavity of the lock sleeve, and the first end of the lock cylinder is engaged with the inner wall of the lock sleeve; the second end of the lock cylinder protrudes from the lock sleeve and is used to connect with the switch cabinet.

[0009] The inner wall of the lock sleeve has a protruding ring, the side of the protruding ring facing the central axis of the lock sleeve is an inclined surface, the distance from the inclined surface to the outer wall of the lock sleeve gradually increases along the direction of insertion from the lock cylinder, and the lock cylinder has an inclined mating surface that cooperates with the inclined surface.

[0010] In some embodiments, a first groove for engaging with the cabinet door of the switch cabinet is formed on the outer side wall of the lock sleeve. The first groove is located on the outer side of the lock sleeve corresponding to the inclined surface, and the distance from the first groove to the inner side wall of the lock sleeve is greater than 1 mm.

[0011] In some embodiments, the distance from the first groove to the inner wall of the lock sleeve is 1 to 2.5 mm.

[0012] In some embodiments, the distance from the inclined mating surface of the lock cylinder to the central axis of the lock cylinder gradually decreases along the direction of the lock cylinder insertion, and the angle formed by the inclined mating surface of the lock cylinder and the horizontal direction is the same as the angle formed by the inclined surface of the lock sleeve and the horizontal direction.

[0013] In some embodiments, a second groove is formed on the outer side wall between the inclined surface of the lock cylinder and the second end, and the diameter of the lock cylinder located at the second groove is not less than 11 mm.

[0014] In some embodiments, the diameter of the lock cylinder located in the second groove is 11 to 12 mm.

[0015] In some embodiments, a steel wire retaining ring for limiting the separation of the lock cylinder and the lock sleeve is installed at the second groove.

[0016] In some embodiments, the second end of the lock cylinder includes a threaded cylindrical portion for threaded fixing, the length of which is 20-22 mm.

[0017] In some embodiments, the lock sleeve is made of ordinary carbon steel, and the lock cylinder is made of 45 steel.

[0018] On the other hand, the present invention provides a cabinet on which a through nut is installed;

[0019] Cabinet door, the cabinet door being movably installed on the cabinet body; and

[0020] The switch cabinet door lock device as described above;

[0021] The cabinet door has an installation through hole, through which the switch cabinet door lock device passes and is fixed. When the switch cabinet is in the locked state, one end of the switch cabinet door lock device fixes the cabinet door, and the other end of the switch cabinet is threadedly fixed to the nut, thereby connecting and fixing the cabinet door and the cabinet body.

[0022] The technical solutions provided by the embodiments of the present invention may include the following beneficial effects:

[0023] The switchgear door lock device provided by this invention has a convex ring with an inclined surface facing the central axis of the lock sleeve on the inner wall of the lock sleeve, and the lock cylinder also has an inclined mating surface that cooperates with the inclined surface. Thus, in the locked state, the lock cylinder and lock sleeve make contact using an inclined surface structure. Therefore, when the door lock device is subjected to stress impact, the stress is dispersed in both the horizontal and vertical directions on the inclined surface, thereby greatly reducing the horizontal arc impact force. This improves the structural strength of the lock cylinder and lock sleeve, ensuring the door lock strength of the high-voltage switchgear and meeting the strength requirements of the arc test. Furthermore, this door lock device has the advantages of ingenious design, novel structure, low cost, and high safety and reliability.

[0024] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit this disclosure. Attached Figure Description

[0025] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0026] Figure 1 This is a schematic diagram of the switch cabinet door lock device in an embodiment of the present invention.

[0027] Figure 2 This is a front view of the switch cabinet door lock device in an embodiment of the present invention.

[0028] Figure 3 yes Figure 2 A sectional view of the switch cabinet door lock device along the AA direction.

[0029] Figure 4 This is a schematic diagram of the lock sleeve in an embodiment of the present invention.

[0030] Figure 5 This is a front view of the lock sleeve in an embodiment of the present invention.

[0031] Figure 6 yes Figure 5 A cross-sectional view of the locking sleeve along the AA direction.

[0032] Figure 7 This is a front view of the lock cylinder in an embodiment of the present invention.

[0033] Figure 8 yes Figure 7 A cross-sectional view of the lock cylinder along the BB direction.

[0034] Figure 9 This is a partial schematic diagram of the switch cabinet in an embodiment of the present invention.

[0035] In the figure, 1 is the lock sleeve; 101 is the first through hole; 102 is the second through hole; 103 is the convex ring; 104 is the first groove; 105 is the hemispherical structure; 2 is the lock cylinder; 201 is the first cylindrical part; 202 is the frustum part; 203 is the second cylindrical part; 204 is the second groove; 205 is the threaded cylindrical part; 206 is the end of the frustum; 100 is the switch cabinet door lock device; 200 is the cabinet door; and 300 is the cabinet body. Detailed Implementation

[0036] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0037] Although the terms "first," "second," etc., are used in this application to describe multiple elements or components, these elements or components should not be limited by these terms. These terms are used only to distinguish one element or component from another, and do not imply "order." Therefore, referring to the first element or component discussed below as the second element or component does not depart from the concept and scope of this invention.

[0038] like Figure 1-3 As shown, Figure 1 This is a schematic diagram of the switch cabinet door lock device in an embodiment of the present invention. Figure 2 This is a front view of the switch cabinet door lock device in an embodiment of the present invention. Figure 3 yes Figure 2 A sectional view of the switch cabinet door lock device along the AA direction.

[0039] An embodiment of the present invention provides a switchgear door lock device, including a lock sleeve 1, a lock cylinder 2, and a steel wire retaining ring for the shaft (not shown in the figure). Specifically, the door lock device of this embodiment is applied to a 12kV high-voltage switchgear. The lock sleeve 1 is hollow inside, and one end of the lock cylinder 2 is inserted into the lock sleeve 1. A steel wire retaining ring for the shaft is fitted on the side wall of this end to engage with the inner cavity of the lock sleeve 1 to lock the lock cylinder 2 and prevent the lock cylinder 2 from separating from the lock sleeve 1.

[0040] like Figure 4-6 As shown, Figure 4 This is a schematic diagram of the lock sleeve in an embodiment of the present invention. Figure 5 This is a front view of the lock sleeve in an embodiment of the present invention. Figure 6 yes Figure 5 A cross-sectional view of the locking sleeve along the AA direction.

[0041] like Figure 6 As shown, the lock sleeve 1 has a hollow cavity inside, which includes a first through hole 101 and a second through hole 102. The diameter of the first through hole 101 is larger than the diameter of the second through hole 102. The first through hole 101 is located above the second through hole 102, and a protruding ring 103 is provided between the first through hole 101 and the second through hole 102. The side of the protruding ring 103 facing the central axis of the lock sleeve 1 is inclined, and the distance from the inclined surface to the outer wall of the lock sleeve 1 gradually increases along the direction of insertion from the lock cylinder 2. In this embodiment, the angle formed by the inclined surface of the lock sleeve 1 and the horizontal plane is 150°.

[0042] The outer wall of the lock sleeve 1 has a first groove 104 that mates with the cabinet door of the switch cabinet. The first groove 104 is located on the outer surface of the lock sleeve 1, corresponding to the inclined surface of the inner wall of the lock sleeve 1. The function of the first groove 104 is that when the door lock device is fitted into the cabinet door, one end of the lock sleeve 1 abuts against one side of the cabinet door, and a retaining ring is installed on the first groove 104, thereby abutting against the other side of the cabinet door, thus achieving a fastening effect on the cabinet door. In this application, the thickness between the first groove 104 and the inner wall of the lock sleeve 1 is greater than 1 mm, preferably 1–3.3 mm. Specifically, in this embodiment, the distance from the first groove 104 to the inner wall of the lock sleeve 1 is designed to be 2.6–3.3 mm. In related door lock devices, the thickness between the groove on the lock sleeve 1 and the inner wall of the lock sleeve 1 is 1 mm. Compared to this, the thickness at the first groove 104 in this embodiment is greater, thereby increasing the mechanical strength of the first groove 104.

[0043] The lock sleeve 1 has a hemispherical structure 105 on the outer wall of one end of the first through hole 101, and the planar side of the hemispherical structure 105 abuts against the door panel during installation.

[0044] Figure 7 This is a front view of the lock cylinder in an embodiment of the present invention. Figure 8 yes Figure 7 The figure shows a cross-sectional view of the lock cylinder along the BB direction. As shown, the first end of the lock cylinder 2 is inserted into the cavity of the lock sleeve 1. The first end of the lock cylinder 2 is engaged with the inner wall of the lock sleeve 1, and the second end of the lock cylinder 2 protrudes from the lock sleeve 1 for connection with the switch cabinet. The first end of the lock cylinder 2 includes a first cylindrical portion 201 and a frustum portion 202. The diameter of the frustum portion 202 gradually decreases away from the first cylindrical portion 201, thus forming an inclined mating surface that engages with the inclined surface of the lock sleeve 1. The inclination angle of the inclined mating surface of the side wall of the frustum portion 202 is the same as the inclination angle of the inclined surface of the lock sleeve 1. When the lock cylinder 2 is in the locked state, the inclined mating surface of the outer side wall of the frustum portion 202 engages and abuts against the inclined surface of the lock sleeve 1. In this embodiment, the angle formed by the inclined mating surface of the lock cylinder 2 and the horizontal plane is 150°.

[0045] In related door lock devices, an annular shoulder is provided on the inner wall between the two through holes of the lock sleeve, and the front end of the lock cylinder includes a first cylindrical part and a second cylindrical part, with no inclined surface transition between them. One end of the lock cylinder horizontally abuts against the shoulder. Compared with the door lock devices in related technologies, the door lock device in this embodiment improves the contact and mating parts of the lock sleeve 1 and the lock cylinder 2. Specifically, a transition is made between the two through holes of different sizes in the lock sleeve 1 to form an annular inclined surface, and a frustum 202 structure is added to the lock cylinder 2. The inclined angle of the inclined mating surface of the frustum 202 is the same as the inclined angle of the inclined surface of the lock sleeve 1, thereby connecting with the inclined surface of the lock sleeve 1. When the lock cylinder 2 is locked and fixed, the outer wall of the frustum 202 fits and connects with the inclined surface.

[0046] During the arcing test, the impact force generated by the electric arc is applied outward to the lock sleeve 1. The inclined surface of the inner wall of the lock sleeve 1 then transmits this impact force to the lock cylinder 2. Because the lock sleeve 1 and lock cylinder 2 are in contact at an inclined angle, the impact force is decomposed into a horizontal outward impact force and a vertical impact force. Compared with door lock devices in related technologies, the arc impact force is dispersed in two directions, thus greatly reducing the horizontal arc impact force and improving the structural strength of the lock sleeve 1 and lock cylinder 2.

[0047] See also Figure 7-8 The second end of the lock cylinder 2 includes a threaded cylindrical portion 205 and a frustum-shaped end portion 206. The outer wall of the threaded cylindrical portion 205 has threads for rotational locking with a nut. The thread length of the lock cylinder 2 in this application is extended to 20-22 mm. In this embodiment, the thread length of the threaded cylindrical portion 205 is set to 21 mm. Therefore, when the second end of the lock cylinder 2 is rotated and locked onto the nut of the switch cabinet, the end face of the second end (the threaded cylindrical portion 205 and the frustum-shaped end portion 206) protrudes from the nut by a distance of 3 mm. In related technologies, the thread length of the lock cylinder is designed to be 15 mm. When the second end of the lock cylinder is fully locked, its threaded cylindrical portion is threadedly connected to the nut. Compared to this, the contact area between the outer wall of the second end of the lock cylinder and the nut is increased in this embodiment. When an arc impact force is generated during an arc test, the friction between the lock cylinder 2 and the nut is greater, thereby improving the strength of the switch cabinet door lock device.

[0048] See also Figure 7-8The lock cylinder includes a second cylindrical portion 203 between the frustum portion 202 and the threaded cylindrical portion 205. The diameter of the second cylindrical portion 203 is larger than the diameter of the threaded cylindrical portion 205 and smaller than the inner diameter of the second through hole 102. The second cylindrical portion 203 is inserted into the second through hole 102. A second groove 204 is formed on the outer wall of the second cylindrical portion 203 near the end of the threaded cylindrical portion 205. The diameter of the lock cylinder 2 at the second groove 204 is 11-12 mm. In this embodiment, the diameter of the lock cylinder 2 at the second groove 204 is preferably 11 mm. In related art door lock devices, the diameter of the lock cylinder at the groove is 7 mm. Compared with this, in the door lock device of this embodiment, the diameter of the lock cylinder 2 at the second groove 204 is larger, so it is not easy to break under the impact of electric arc, thereby improving the strength of the door lock device.

[0049] See also Figure 7-8 A steel wire retaining ring is installed on the second groove 204 to prevent the lock cylinder 2 from separating from the lock sleeve 1. This prevents the second end of the lock cylinder 2 from separating from the second through hole 102 of the lock sleeve 1 in the locked state, ensuring that the lock sleeve 1 and the lock cylinder 2 are in a movable connection state. In related door lock devices, a plastic retaining ring is installed on the groove. Compared to this, the door lock device of this embodiment uses a steel wire retaining ring, which has greater mechanical strength than a plastic retaining ring, thereby further increasing the strength at the second groove 204.

[0050] In this embodiment, the lock sleeve 1 of the door lock device is made of ordinary carbon steel, and the lock cylinder 2 is made of 45# steel. In related art door lock devices, both the lock sleeve and the lock cylinder are made of ordinary carbon steel. Compared with this, the lock cylinder 2 made of 45# steel in this embodiment has greater overall mechanical strength, thereby further increasing the mechanical strength of the door lock device in this application.

[0051] The switchgear provided in the above embodiments has the following advantages:

[0052] The switchgear door lock device provided in this embodiment improves the structure of the door lock device. Improvements include using inclined surface contact between the lock cylinder and lock sleeve, lengthening the threaded end, increasing the diameter of the lock cylinder retaining ring groove and the thickness of the lock sleeve groove and inner wall, replacing the ordinary plastic retaining ring with a axial steel wire retaining ring, and using 45# steel to manufacture the lock cylinder. These improvements enhance the door lock strength of the high-voltage switchgear to meet the strength requirements of the arc test. Furthermore, this door lock structure has advantages such as ingenious design, novel structure, low cost, and high safety and reliability.

[0053] On the other hand, such as Figure 9As shown, an embodiment of the present invention provides a switch cabinet, which includes a cabinet body 300, a cabinet door 200 movably mounted on the cabinet body 300, and a switch cabinet front door lock 100 as described in the above embodiment. The cabinet door 200 has a mounting through hole through which the switch cabinet door lock device 100 passes and is fixed, thereby securing the cabinet door 200. A through nut is installed at a corresponding position on the cabinet body 300. When the cabinet door 200 is engaged and closed, the mounting through hole is aligned with the central axis of the nut. Therefore, one end of the switch cabinet front door lock 100 fixes the cabinet door 200, and the other end can be threadedly connected to the nut. By tightening the door lock device 100 with a key, the cabinet door 200 and the cabinet body 300 can be locked and fixed in place.

[0054] The switchgear in this embodiment adopts the improved door lock device in the above embodiment. The door lock device with weak points has been improved, which greatly improves its mechanical strength. This also improves the mechanical strength of the switchgear equipment in this embodiment, so it can meet the requirements of the internal arc test.

[0055] It should be understood that the technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments have been described. However, there are no contradictory combinations of these technical features, and they should all be considered to be within the scope of this specification.

[0056] The above are merely preferred embodiments of this disclosure and are not intended to limit the scope of protection of this disclosure. All equivalent structural changes made based on the description and drawings of this disclosure are included within the scope of protection of this disclosure.

Claims

1. A switch cabinet door lock device, characterized in that, The switchgear door lock device is used in high-voltage switchgear to withstand internal arcing impacts. The switchgear door lock device includes: A locking sleeve having a hollow cavity formed therein; and A lock cylinder is inserted into the cavity of the lock sleeve, and the first end of the lock cylinder is engaged with the inner wall of the lock sleeve; the second end of the lock cylinder protrudes from the lock sleeve for connection with the switch cabinet, and the second end of the lock cylinder includes a threaded cylindrical part for threaded fixing, the length of the threaded cylindrical part being 20~22mm; a second groove is formed on the outer side wall between the inclined surface of the lock cylinder and the second end, and the diameter of the lock cylinder located at the second groove is not less than 11mm; The inner wall of the lock sleeve has a protruding ring, the side of the protruding ring facing the central axis of the lock sleeve is an inclined surface, the distance from the inclined surface to the outer wall of the lock sleeve gradually increases along the direction of insertion from the lock cylinder, and the lock cylinder has an inclined mating surface that cooperates with the inclined surface.

2. The switch cabinet door lock device according to claim 1, characterized in that, A first groove is formed on the outer side wall of the lock sleeve for engaging with the cabinet door of the switch cabinet. The first groove is located on the outer side of the lock sleeve corresponding to the inclined surface, and the distance from the first groove to the inner side wall of the lock sleeve is greater than 1 mm.

3. The switch cabinet door lock device according to claim 2, characterized in that, The distance from the first groove to the inner wall of the lock sleeve is 1~3.3mm.

4. The switch cabinet door lock device according to claim 1, characterized in that, The distance from the inclined mating surface of the lock cylinder to the central axis of the lock cylinder gradually decreases along the direction of the lock cylinder insertion, and the angle formed by the inclined mating surface of the lock cylinder and the horizontal direction is the same as the angle formed by the inclined surface of the lock sleeve and the horizontal direction.

5. The switch cabinet door lock device according to claim 1, characterized in that, The diameter of the lock cylinder located in the second groove is 11~12mm.

6. The switch cabinet door lock device according to claim 1, characterized in that, A steel wire retaining ring for the shaft is installed at the second groove to prevent the lock cylinder and the lock sleeve from separating.

7. The switch cabinet door lock device according to claim 1, characterized in that, The lock sleeve is made of ordinary carbon steel, and the lock cylinder is made of No. 45 steel.

8. A switch cabinet, characterized in that, include: The cabinet has a through nut installed on it; Cabinet door, which is movably installed on the cabinet body; as well as The switch cabinet door lock device as described in any one of claims 1-7; The cabinet door has an installation through hole, through which the switch cabinet door lock device passes and is fixed. When the switch cabinet is in the locked state, one end of the switch cabinet door lock device fixes the cabinet door, and the other end of the switch cabinet is threadedly fixed to the nut, thereby connecting and fixing the cabinet door and the cabinet body.

Images