Pressure relief device and dual-power-supply automatic switching switch cabinet

Abstract

The utility model discloses a pressure relief device and a dual-power-supply automatic switching switch cabinet, and belongs to the field of large-scale power grid systems. The pressure relief device comprises a cabinet body, the middle of the upper end of the cabinet body communicates with a pressure relief seat, a pressure relief mechanism is installed at the upper end of the pressure relief seat, and an adjusting mechanism is further arranged on one side of the upper end of the cabinet body. The pressure relief mechanism comprises a shell connected with the pressure relief seat, a sliding sleeve is arranged in the shell in a sliding mode, and the sliding sleeve is connected with the shell through a pressure relief spring; the adjusting mechanism comprises a hollow sleeve and a pressing disc arranged in the sleeve, the pressing disc is connected with an inner cavity of the sleeve through threads, a rotating rod is arranged at the upper end of the pressing disc, a mounting plate is arranged below the pressing disc, an adjusting spring is arranged between the mounting plate and the pressing disc, and a ball is mounted at the bottom end of the mounting plate. The bottom of an inner cavity of the sleeve is of a conical structure. According to the pressure relief valve, the pressure threshold value of pressure relief is adjusted, and the effect of prompting workers in the pressure relief process is achieved.

Description

Technical Field

[0001] The utility model relates to the field of large-scale power grid systems, in particular to a pressure relief device and a dual-power automatic switching switch cabinet. Background Art

[0002] A switch cabinet refers to a device that plays roles such as switching on and off, controlling, or protecting in the processes of power generation, transmission, distribution, power conversion, and consumption of a power system. According to different voltage levels, it can be further divided into high-voltage switch cabinets, medium-voltage switch cabinets, low-voltage switch cabinets, etc. During the use of a high-voltage switch cabinet, once an arc fault occurs inside the high-voltage switch cabinet body, the internal gas pressure suddenly rises. At this time, relying solely on the heat dissipation holes cannot discharge the pressure in time. The high-pressure gas cannot be effectively released within a very short time in the narrow cabinet body, and the gas will impact all directions of the cabinet body, easily causing external components such as the cabinet door of the cabinet body to be pushed open, and may also endanger personal safety. Therefore, when designing high-voltage switchgear, effective pressure relief measures must be considered.

[0003] In a large-scale power grid system, a commonly used pressure relief method is to set some pressure relief ports on the outer shell of the high-voltage switch cabinet, and use plastic screws to fix a metal plate on the outer shell to close the pressure relief ports. When the internal pressure of the device suddenly increases, the metal plate will be pushed open, allowing the high-pressure gas to be discharged through the pressure relief ports. Since the speed at which the metal plate is pushed open by the airflow is relatively high, it is easy to endanger personnel and other surrounding equipment, and it is difficult to restore the original state after pressure relief, and it needs to be replaced again to be put into use again, resulting in waste of resources. The patent document with the application number 202023072628.2 discloses a pressure relief device for a high-voltage switch cabinet. Through the cooperation of the first pressure relief mechanism and the second pressure relief mechanism, not only can all the high-pressure gas inside the high-voltage switch cabinet body be discharged, but also the first pressure relief mechanism and the second pressure relief mechanism can be quickly restored to the original state, thus avoiding the deficiency that it is difficult to restore the original state after pressure relief in the existing high-voltage switch cabinet pressure relief device. However, in practical applications, this solution also has some problems. For example, it cannot adjust the pressure threshold of pressure relief, which will affect the pressure relief effect and reduce the usability of the device; in addition, it cannot give an alarm to personnel during pressure relief, and problems cannot be discovered and processed in time. Summary of the Invention

[0004] The purpose of the utility model is to solve the problems in the prior art that the pressure relief device of the high-voltage switch cabinet cannot adjust the pressure threshold of pressure relief during use and cannot give a prompt to the staff during the pressure relief operation, and to propose a pressure relief device and a dual-power automatic switching switch cabinet.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] Pressure relief device, including a cabinet body, a pressure relief seat is connected to the middle of the upper end of the cabinet body, a pressure relief mechanism is installed on the upper end of the pressure relief seat, and an adjustment mechanism is also provided on one side of the upper end of the cabinet body to adjust the pressure threshold of pressure relief.

[0007] In some embodiments, the pressure relief mechanism includes a housing connected to the pressure relief seat, a sliding sleeve is slidably arranged inside the housing, and the sliding sleeve and the housing are connected by a pressure relief spring;

[0008] The sliding sleeve is a hollow circular tube with an upward opening, a permanent magnet is arranged at the bottom end inside the sliding sleeve, and an electromagnet is arranged on the housing corresponding to the permanent magnet.

[0009] In some embodiments, a stepped through hole is opened inside the pressure relief seat, the large hole end and the small hole end of the through hole are connected by a first inclined surface, and the bottom of the sliding sleeve has a second inclined surface that cooperates with the first inclined surface.

[0010] In some embodiments, a pressure ring is arranged on the outer periphery of the sliding sleeve, a plurality of air holes are opened on the housing, and the plurality of air holes are evenly distributed around the pressure ring;

[0011] An annular groove is opened on the upper surface of the pressure relief seat, and a rubber pad is arranged in the annular groove corresponding to the pressure ring, and the pressure ring squeezes the rubber pad.

[0012] In some embodiments, the adjustment mechanism includes a hollow sleeve and a pressure plate arranged inside the sleeve, the pressure plate is connected to the inner cavity of the sleeve by a thread, a rotating rod is arranged at the upper end of the pressure plate, a mounting plate is arranged below the pressure plate, an adjustment spring is arranged between the mounting plate and the pressure plate, a sphere is installed at the bottom end of the mounting plate, and the bottom of the inner cavity of the sleeve is a conical structure; under the elastic force of the adjustment spring, the sphere blocks the bottom of the inner cavity of the sleeve.

[0013] In some embodiments, a guide rod is arranged above one side of the mounting plate, a contact switch is arranged on the bottom surface of the pressure plate corresponding to the guide rod, and notches are opened on the outer peripheries of the pressure plate and the mounting plate to facilitate the high-pressure gas to pass through the notches.

[0014] In some embodiments, a pressure relief port and a connection port are opened on the upper end of the cabinet body, the pressure relief port is connected to the pressure relief seat by a thread, and the connection port is connected to the sleeve by a thread, which is convenient for disassembly and assembly.

[0015] In some embodiments, a storage battery is arranged on the upper end of the cabinet body, and the storage battery is electrically connected to the contact switch and the electromagnet respectively.

[0016] In some embodiments, an electrode sheet one is provided at the upper end of the sliding sleeve, a buzzer is provided at the upper end of the outer shell, an electrode sheet two is provided at the top end inside the outer shell, both the electrode sheet one and the electrode sheet two are connected to a storage battery through wires, the part of the buzzer located inside the outer shell is connected to the electrode sheet two, and after the electrode sheet one and the electrode sheet two come into contact, the storage battery supplies power to the buzzer.

[0017] The present utility model also provides a dual-power automatic switching switch cabinet, including the above pressure relief device.

[0018] Compared with the prior art, the present utility model provides a pressure relief device and a dual-power automatic switching switch cabinet, having the following beneficial effects.

[0019] 1. By providing a pressure relief mechanism and an adjustment mechanism in the present utility model, when the pressure of the high-pressure gas in the cabinet body is greater than the deformation force of the adjustment spring, the sphere is pushed up. At this time, the sphere no longer blocks the inner cavity of the sleeve, and the cabinet body performs preliminary pressure relief work; as the sphere is gradually pushed up, the guide rod moves upward to trigger the contact switch, the storage battery is powered on to make the electromagnet generate a suction force on the permanent magnet, driving the sliding sleeve to move upward, and the pressing ring is separated from the rubber pad. At this time, the high-pressure gas in the cabinet body is discharged to the outside along the air holes, improving the pressure relief effect; and when the sliding sleeve moves upward, the electrode sheet one provided at its upper end comes into contact with the electrode sheet two, the storage battery supplies power to the buzzer, and the buzzer makes a sound after being powered on to give a prompt to the staff, improving work safety.

[0020] 2. By rotating the rotating rod to drive the pressing disc to move downward along the sleeve, at this time the adjustment spring is further compressed, thereby generating a greater downward pressure on the sphere, increasing the use pressure of the sphere, so that the pressure relief will only occur when the pressure in the cabinet body is greater than before. Conversely, if the rotating rod is rotated in the reverse direction, the use pressure of the sphere is reduced, thereby realizing the adjustment of the pressure threshold for pressure relief.

[0021] The parts not involved in this device are the same as those in the prior art or can be realized by using the prior art. The present utility model realizes the adjustment of the pressure threshold for pressure relief and also has the effect of prompting the staff during the pressure relief process.

[0022] Other advantages, objectives and features of the present utility model will be described to some extent in the subsequent specification; and to some extent, based on the study of the following text, it will be obvious to those skilled in the art; or, it can be taught from the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a perspective view of the present utility model.

[0024] Figure 2 is a structural sectional view of the pressure relief mechanism in the present utility model.

[0025] Figure 3 It is an explosion schematic diagram of the pressure relief seat, the outer shell and the sliding sleeve in the present utility model.

[0026] Figure 4 It is a cross-sectional view of the outer shell in the present utility model.

[0027] Figure 5 It is a cross-sectional view of the pressure relief seat in the present utility model.

[0028] Figure 6 It is a cross-sectional view of the sliding sleeve in the present utility model.

[0029] Figure 7 It is a structural cross-sectional view of the adjusting mechanism in the present utility model.

[0030] Figure 8 It is a schematic diagram of the mounting plate and the sphere in the present utility model.

[0031] Figure 9 It is a schematic diagram of the pressure relief port and the connection port in the present utility model.

[0032] Figure 10 It is a schematic diagram of the pressure plate and the rotating rod in the present utility model.

[0033] Figure 11 is the circuit principle of the present utility model Figure 1 .

[0034] Figure 12 is the circuit principle of the present utility model Figure 2 .

[0035] The reference numerals in the drawings are:

[0036] 1, cabinet body; 2, pressure relief seat; 3, outer shell; 4, sliding sleeve; 5, pressure relief spring; 6, permanent magnet; 7, electromagnet; 8, through hole; 9, first inclined surface; 10, second inclined surface; 11, pressure ring; 12, air hole; 13, groove; 14, rubber pad; 15, sleeve; 16, pressure plate; 17, rotating rod; 18, adjusting spring; 19, sphere; 20, guide rod; 21, contact switch; 22, pressure relief port; 23, connection port; 24, storage battery; 25, first electrode plate; 26, buzzer; 27, second electrode plate; 28, mounting plate; 29, notch. Specific embodiments

[0037] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments.

[0038] Refer to Figures 1 - 10, A pressure relief device, including a cabinet body 1, a pressure relief seat 2 is connected to the middle of the upper end of the cabinet body 1, a pressure relief mechanism is installed on the upper end of the pressure relief seat 2, and an adjustment mechanism is further provided on one side of the upper end of the cabinet body 1 to adjust the pressure threshold of the pressure relief.

[0039] Specifically, please refer to again Figure 2 , The pressure relief mechanism includes a housing 3 connected to the pressure relief seat 2, a sliding sleeve 4 is slidably arranged inside the housing 3, and the sliding sleeve 4 and the housing 3 are connected by a pressure relief spring 5; the sliding sleeve 4 is a hollow circular tube with an upward opening, a permanent magnet 6 is arranged at the bottom end inside the sliding sleeve 4, and an electromagnet 7 is arranged on the housing 3 corresponding to the permanent magnet 6. When the electromagnet 7 is energized, it generates a magnetic pole opposite to that of the permanent magnet 6. Due to the principle of attraction between opposite magnetic poles of magnets, the suction force generated between the two is greater than the deformation force of the pressure relief spring 5, thereby driving the sliding sleeve 4 to move upward.

[0040] In this embodiment, a stepped through hole 8 is opened inside the pressure relief seat 2, and the large hole end and the small hole end of the through hole 8 are connected by an inclined surface 9, and the bottom of the sliding sleeve 4 has an inclined surface 10 that cooperates with the inclined surface 9.

[0041] Please refer to again Figure 4 and Figure 6 , A pressure ring 11 is arranged on the outer periphery of the sliding sleeve 4, and a plurality of air holes 12 are opened on the housing 3, and the plurality of air holes 12 are evenly distributed around the pressure ring 11; a circular groove 13 is opened on the upper surface of the pressure relief seat 2, and a rubber pad 14 is arranged in the circular groove 13 corresponding to the pressure ring 11.

[0042] Through the above set structure, when the electromagnet 7 is not energized, under the elastic force of the pressure relief spring 5, the inclined surface 9 is attached to the inclined surface 10, and at the same time the pressure ring 11 is correspondingly pressed on the rubber pad 14.

[0043] Please refer to again Figure 7 , The adjustment mechanism includes a hollow sleeve 15 and a pressure plate 16 arranged inside the sleeve 15. The pressure plate 16 is connected to the inner cavity of the sleeve 15 by threads. A rotating rod 17 is arranged at the upper end of the pressure plate 16, an installation plate 28 is arranged below the pressure plate 16, an adjustment spring 18 is arranged between the installation plate 28 and the pressure plate 16, a sphere 19 is installed at the bottom end of the installation plate 28, and the bottom of the inner cavity of the sleeve 15 is a conical structure. In actual application, the diameter of the sphere 19 is smaller than the diameter of the inner cavity of the sleeve 15. Under the elastic force of the adjustment spring 18, the sphere 19 blocks the bottom of the inner cavity of the sleeve 15.

[0044] In addition, a guide rod 20 is provided above one side of the mounting plate 28, a contact switch 21 is provided on the bottom surface of the pressure plate 16 corresponding to the guide rod 20, notches 29 are formed on the outer circumferences of both the pressure plate 16 and the mounting plate 28. When the sphere 19 no longer blocks the inner cavity of the sleeve 15, the high-pressure gas in the cabinet 1 is discharged to the outside through the notches 29 on the mounting plate 28 and the pressure plate 16 in sequence.

[0045] Please refer to again Figure 9 , a pressure relief port 22 and a connection port 23 are formed at the upper end of the cabinet 1. The pressure relief port 22 is connected to the pressure relief seat 2 through threads, and the connection port 23 is connected to the sleeve 15 through threads. The above-mentioned threaded connection method is simple to operate and convenient for replacement.

[0046] In this embodiment, a storage battery 24 is provided at the upper end of the cabinet 1, and the storage battery 24 is electrically connected to the contact switch 21 and the electromagnet 7 respectively.

[0047] Furthermore, an electrode plate one 25 is provided at the upper end of the sliding sleeve 4, a buzzer 26 is provided at the upper end of the housing 3, and an electrode plate two 27 is provided at the top end inside the housing 3. The electrode plate one 25 and the electrode plate two 27 are both connected to the storage battery 24 through wires, and the part of the buzzer 26 located inside the housing 3 is connected to the electrode plate two 27. The buzzer 26 plays a prompting role during the pressure relief process.

[0048] It is worth mentioning that both the electrode plate one 25 and the electrode plate two 27 are in the shape of an annular flat plate structure, and the distance between the electrode plate one 25 and the electrode plate two 27 is equal to the distance between the electromagnet 7 and the permanent magnet 6. During the pressure relief process, when the electromagnet 7 is powered on and the suction force generated by the electromagnet 7 on the permanent magnet 6 causes the two to come into contact, the electrode plate one 25 and the electrode plate two 27 can be stably connected, and the storage battery 24 supplies power to the buzzer 26. After the buzzer 26 is powered on, it emits a sound to prompt the staff.

[0049] The working principle of the present utility model is as follows:

[0050] Please refer to again Figure 2 , when the pressure inside the cabinet 1 rises and the pressure of the generated high-pressure gas is greater than the deformation force of the adjusting spring 18, the sphere 19 is pushed up. At this time, the sphere 19 no longer blocks the inner cavity of the sleeve 15, and the high-pressure gas in the cabinet 1 is discharged to the outside through the notches 29 on the mounting plate 28 and the pressure plate 16 in sequence, enabling the cabinet 1 to perform preliminary pressure relief work. As the sphere 19 is gradually pushed up, the guide rod 20 moves upward to trigger the contact switch 21. At this time, the storage battery 24 is powered on to make the electromagnet 7 generate a suction force on the permanent magnet 6, thereby driving the sliding sleeve 4 to move upward, and the pressure ring 11 is separated from the rubber pad 14. At this time, the high-pressure gas in the cabinet 1 is discharged to the outside along the air holes 12, improving the pressure relief effect.

[0051] When the above-mentioned sliding sleeve 4 moves upward, the first electrode plate 25 provided at its upper end contacts the second electrode plate 27, and the storage battery 24 supplies power to the buzzer 26. After the buzzer 26 is powered on, it emits a sound to prompt the staff.

[0052] After the pressure relief work is completed, the sphere 19 reseals the inner cavity of the sleeve 15 under the elastic force of the adjusting spring 18, and the guide rod 20 disengages from the contact switch 21. At this time, under the action of the pressure relief spring 5, the sliding sleeve 4 returns to its initial position, that is, the first electrode plate 25 and the second electrode plate 27 are disengaged, so that the storage battery 24 no longer supplies power to the buzzer 26, so as to turn off the buzzer 26 after the pressure relief operation. If the staff finds that the buzzer 26 is on for a long time, they can know that there is a problem with the pressure relief work, discover the problem in time and conduct a check to ensure the safety of the work.

[0053] Please refer to again Figure 7 , when it is necessary to increase the pressure on the sphere 19 during use, the rotating rod 17 can be rotated to drive the pressing disc 16 to move downward along the sleeve 15. At this time, the adjusting spring 18 is further compressed, thereby generating a greater downward pressure on the sphere 19 and increasing the use pressure of the sphere 19. Thus, the pressure relief will only occur when the pressure in the cabinet 1 is greater than before. Conversely, if the rotating rod 17 is rotated in the reverse direction, the use pressure of the sphere 19 will be reduced, realizing the adjustment of the pressure threshold for pressure relief.

[0054] The present utility model also provides a double-power automatic switching switch cabinet, including the above-mentioned pressure relief device, which further improves the operation safety of the switch cabinet; at the same time, the applicant needs to specifically point out that considering the requirements of the power supply system for places and loads that ensure continuous and uninterrupted power supply, and to avoid the adverse impact on users caused by too long switching power-off time, a double-power automatic switching circuit is also equipped inside the high-voltage switch cabinet with the above-mentioned pressure relief function. Please refer to Figure 11 and Figure 12 shown in the circuit schematic diagram. The operation principle of the double-power automatic switching of the present utility model is specifically as follows:

[0055] When the incoming cable of the main power cabinet is energized, the power transformer is energized to provide 220V power; the undervoltage coil of the circuit breaker 1DL is energized and the relay 1ZJ is closed, the control circuit is energized, the disconnector has been closed, and the circuit breaker 1DL can be manually or automatically closed. After the circuit breaker 1DL is closed, the main power supply works; when the main power supply loses power, the circuit breaker 1DL trips. At this time, the circuit breaker 2DL automatically closes and locks the tripping circuit of the circuit breaker 1DL. The specific process is as follows: after the circuit breaker 1DL trips, the change-over switch is in the automatic position, its normally closed contact closes, the contact of the relay 2ZJ has closed, the circuit breaker 2DL closes, and the standby power supply is automatically put into operation; when the main power supply comes back, the relay 1ZJ is energized, its contact closes, the circuit breaker 2DL trips, and the contact of the circuit breaker 2DL connected in series to the closing circuit of the circuit breaker 1DL closes after tripping, the circuit breaker 1DL automatically closes and locks the tripping circuit of the circuit breaker 2DL, switches to the main power supply, and the main power supply works, thus effectively realizing the automatic switching of the dual power supplies and reducing the human participation.

[0056] The above is only the preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered within the protection scope of the present invention.

[0057] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0058] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A pressure relief device, comprising a cabinet (1), characterized in that: The middle part of the upper end of the cabinet (1) is connected to a pressure relief seat (2), a pressure relief mechanism is installed on the upper end of the pressure relief seat (2), and an adjustment mechanism is also arranged on one side of the upper end of the cabinet (1); The pressure relief mechanism comprises a housing (3) connected to the pressure relief seat (2); a sleeve (4) is slidably arranged inside the housing (3); the sleeve (4) and the housing (3) are connected via a pressure relief spring (5); the sleeve (4) is in the shape of a hollow circular tube with an opening facing upward; a permanent magnet (6) is arranged at the bottom end of the sleeve (4); and an electromagnet (7) is arranged on the housing (3) corresponding to the permanent magnet (6); The adjustment mechanism comprises an internally hollow sleeve (15) and a pressure plate (16) arranged in the sleeve (15); the pressure plate (16) is connected to the inner cavity of the sleeve (15) by means of a thread; a rotating rod (17) is arranged at the upper end of the pressure plate (16); a mounting plate (28) is arranged below the pressure plate (16); an adjustment spring (18) is arranged between the mounting plate (28) and the pressure plate (16); a ball (19) is installed at the bottom end of the mounting plate (28); and the bottom of the inner cavity of the sleeve (15) is a conical structure; A guide rod (20) is disposed above one side of the mounting plate (28), a contact switch (21) is disposed on the bottom surface of the pressure plate (16) corresponding to the guide rod (20), and a notch (29) is provided on the outer circumference of the pressure plate (16) and the mounting plate (28); The cabinet (1) has a pressure relief port (22) and a connection port (23) at the upper end, the pressure relief port (22) being connected to the pressure relief seat (2) via a thread, and the connection port (23) being connected to the sleeve (15) via a thread; The pressure relief seat (2) has a stepped through hole (8) formed inside, the large hole end and the small hole end of the through hole (8) are connected via a beveled surface (9), and the bottom of the sliding sleeve (4) has a beveled surface (10) matching the beveled surface (9); a pressure ring (11) is provided on the outer periphery of the sliding sleeve (4), and a plurality of air holes (12) are formed on the outer shell (3), and the plurality of air holes (12) are evenly distributed around the pressure ring (11); an annular groove (13) is formed on the upper surface of the pressure relief seat (2), and a rubber pad (14) is provided in the annular groove (13) corresponding to the pressure ring (11).

2. The pressure relief device according to claim 1, characterized in that: A storage battery (24) is provided at the upper end of the cabinet (1), and the storage battery (24) is electrically connected to the contact switch (21) and the electromagnet (7) respectively.

3. The pressure relief device according to claim 2, characterized in that: The upper end of the sliding sleeve (4) is provided with an electrode sheet 1 (25), the upper end of the housing (3) is provided with a buzzer (26), and the top end of the housing (3) is provided with an electrode sheet 2 (27). The electrode sheet 1 (25) and the electrode sheet 2 (27) are both connected to the battery (24) via a wire, and the portion of the buzzer (26) located inside the housing (3) is connected to the electrode sheet 2 (27).

4. Dual power automatic switching switch cabinet, characterized in that: Comprising a pressure relief device as described in any one of claims 1-3.

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