Jet type fuse device

Abstract

The utility model provides an injection type fuse device, which belongs to the technical field of electric power equipment and comprises a porcelain sleeve, a housing, a sealing cover plate, a contact tube, a fuse carrying tube, an upper wiring terminal, a lower wiring terminal, a contact, a flow guide cover, a pressure relief nozzle, a temperature sensing glass ball, a fixed seat and a telescopic spring. The temperature sensing glass ball is blocked in the pressure relief nozzle, so that the sealing performance of the whole jet fuse can be guaranteed at ordinary times, the temperature sensing glass ball in the pressure relief nozzle is broken under the action of high temperature of an electric arc, and high-pressure gas can be discharged from the pressure relief nozzle, so that the pressure in the cavity is reduced, the safety of a product can be improved, and the service life of the product is prolonged. The surface of the hemispherical flow guide cover is in an arc shape, high-pressure gas can be buffered, when the flow guide cover is impacted by high-pressure gas flow, the telescopic springs at the left end and the right end of the bottom of the flow guide cover are stressed and compressed, the flow guide cover can be buffered, and the flow guide cover is prevented from being directly sprayed outwards along with the high-pressure gas flow.

Description

Technical Field

[0001] The utility model relates to the technical field of power equipment, and particularly relates to a jet fuse device. Background Art

[0002] The jet fuse is mainly used in the urban and rural power transmission and distribution systems of the power industry, and can achieve full-range protection. When the line is short-circuited or overloaded, the fuse wire is melted to form an arc. Under the action of elastic force, the arc is stretched. The high temperature of the arc decomposes the surrounding gas-producing medium into gas, and the pressure in the fuse carrier tube rises rapidly. Along with the melted metal, the free gas forming a longitudinal air flow is ejected out of the tube, causing the arc to extinguish.

[0003] It is found in actual use that the existing jet fuses have the following deficiencies:

[0004] Under the action of the high temperature of the arc in the existing jet fuse, the heat released by the arc accumulates in the channel, resulting in a significant increase in the internal pressure of the closed space. After the high-temperature and high-pressure gas accumulates for a period of time and rushes outwards, the pressure in the cavity is relatively large at this time, resulting in poor safety.

[0005] There is no buffering for the high-temperature and high-pressure gas, and the sealing cover plate will be quickly ejected. However, the ejected sealing cover plate is extremely likely to pose a safety hazard to nearby equipment and cause harm to personnel.

[0006] Therefore, the present application provides a jet fuse device to meet the requirements. Content of the Utility Model

[0007] The purpose of the utility model is to solve the problems existing in the above background art, and to propose a jet fuse device.

[0008] To solve the above technical problems, the utility model provides the following technical solutions:

[0009] A jet fuse device includes: a porcelain bushing, a housing, a sealing cover plate, a contact tube, a fuse carrier tube, an upper terminal, a lower terminal, a contact, a flow guide cover, a pressure relief nozzle, a temperature-sensitive glass ball, a fixing seat and a telescopic spring. The housing is installed at the bottom of the porcelain bushing, the sealing cover plate is installed at the bottom of the housing, the contact tube is installed inside the porcelain bushing, the fuse carrier tube is installed inside the contact tube, the upper terminal is installed at the top of the porcelain bushing, the lower terminal is installed at the lower end side of the porcelain bushing, the contact is installed at the lower end inside the porcelain bushing, the flow guide cover is installed inside the housing, the pressure relief nozzle is installed at the lower end of the flow guide cover, the temperature-sensitive glass ball is installed inside the pressure relief nozzle, the fixing seat is installed at the lower end inside the housing, and the telescopic spring is installed at the upper end of the fixing seat.

[0010] Preferably, the flow deflector is located at the upper opening of the housing, and the flow deflector faces the opening between the flow deflector and the pressure relief nozzle.

[0011] Preferably, the flow deflector is hemispherical and is made of ceramic material.

[0012] Preferably, the pressure relief nozzle is located in the middle of the flow deflector, and the pressure relief nozzle is in communication with the flow deflector.

[0013] Preferably, the pressure relief nozzle extends vertically downward through the sealing cover plate and extends into the interior of the sealing cover plate.

[0014] Preferably, the heat-sensitive glass bulb is disposed opposite to the bottom of the fuse carrier tube.

[0015] Preferably, there are two sets of fixing seats, which are respectively located on the left and right sides of the housing, and the fixing seats are located at the upper side of the sealing cover plate.

[0016] Preferably, the telescopic spring is disposed vertically, and the upper end of the telescopic spring abuts against the bottom of the flow deflector.

[0017] By providing a pressure relief nozzle and installing a heat-sensitive glass bulb inside, the heat-sensitive glass bulb blocks the inside of the pressure relief nozzle to ensure the sealing of the entire jet fuse usually. When under the action of arc high temperature, the heat-sensitive glass bulb in the pressure relief nozzle breaks, and the high-pressure gas can vent out from the pressure relief nozzle, thereby reducing the pressure in the cavity and improving the safety of the product.

[0018] The flow deflector made of ceramic material is not easily heated and deformed under the impact of high-temperature and high-pressure gas. When under the action of arc high temperature, the high-pressure gas at the bottom of the fuse carrier tube rushes towards the flow deflector. The surface of the hemispherical flow deflector is arc-shaped, which can buffer the high-pressure gas. When the flow deflector is impacted by the high-pressure air flow, the telescopic springs at the left and right ends of the bottom of the flow deflector are compressed by force, which can buffer the flow deflector and prevent the flow deflector from being directly ejected outwards with the high-pressure air flow, and can reduce the risk of the sealing cover plate being bounced off and reduce the potential problem of damage to nearby equipment and personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings incorporated herein and constituting a part of this specification illustrate embodiments of the present disclosure and, together with the specification, further serve to explain the principles of the present disclosure and enable those skilled in the relevant art to implement and use the present disclosure.

[0020] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 is a schematic cross-sectional structure diagram of the present invention;

[0022] Figure 3Schematic diagram of the specific internal structure of the housing of the present utility model;

[0023] Figure 4 Schematic diagram of the flow deflector structure of the present utility model;

[0024] Figure 5 Of the present utility model Figure 3 Enlarged schematic diagram of the structure at position A.

[0025] [Reference numerals]

[0026] Porcelain bushing; 2 - housing; 3 - sealing cover plate; 4 - contact pipe; 5 - fuse carrier tube; 6 - upper terminal; 7 - lower terminal; 8 - contact; 9 - flow deflector; 10 - pressure relief nozzle; 11 - fusible link; 12 - fixing seat; 13 - telescopic spring.

[0027] As shown in the figure, in order to clearly implement the structure of the embodiments of the present utility model, specific structures and devices are marked in the figure, but this is only for schematic purposes and is not intended to limit the present utility model to this specific structure, device and environment. According to specific needs, those of ordinary skill in the art can adjust or modify these devices and environments, and the adjustments or modifications made are still included within the scope of the appended claims. Detailed implementation manners

[0028] As Figure 1 , Figure 2 , Figure 3 , Figure 4 And Figure 5 As shown in, an injection type fuse device provided by an embodiment of the present utility model includes: a porcelain bushing 1, a housing 2, a sealing cover plate 3, a contact pipe 4, a fuse carrier tube 5, an upper terminal 6, a lower terminal 7, a contact 8, a flow deflector 9, a pressure relief nozzle 10, a fusible link 11, a fixing seat 12 and a telescopic spring 13. The housing 2 is installed at the bottom of the porcelain bushing 1, the sealing cover plate 3 is installed at the bottom of the housing 2, the contact pipe 4 is installed inside the porcelain bushing 1, the fuse carrier tube 5 is installed inside the contact pipe 4, the upper terminal 6 is installed at the top of the porcelain bushing 1, the lower terminal 7 is installed at the lower side of the porcelain bushing 1, the contact 8 is installed at the lower end inside the porcelain bushing 1, the flow deflector 9 is installed inside the housing 2, the pressure relief nozzle 10 is installed at the lower end of the flow deflector 9, the fusible link 11 is installed inside the pressure relief nozzle 10, the fixing seat 12 is installed at the lower end inside the housing 2, and the telescopic spring 13 is installed at the upper end of the fixing seat 12.

[0029] In this embodiment, the flow deflector 9 is located at the upper opening of the housing 2, and the flow deflector 9 is directly opposite to the opening between the flow deflector 9 and the pressure relief nozzle 10.

[0030] In this embodiment, the fairing 9 is hemispherical and made of ceramic material. The fairing 9 made of ceramic material is not easily heated and deformed under the impact of high-temperature and high-pressure gas. When under the action of the arc high temperature, the high-pressure gas at the bottom of the fuse tube 5 rushes towards the fairing 9. The surface of the hemispherical fairing 9 is arc-shaped, which can buffer the high-pressure gas.

[0031] In this embodiment, the pressure relief nozzle 10 is located in the middle of the fairing 9 and is connected to the fairing 9. The high-pressure gas rushing towards the fairing 9 can be ejected from the pressure relief nozzle 10.

[0032] In this embodiment, the pressure relief nozzle 10 extends vertically downward through the sealing cover plate 3 and extends into the inside of the sealing cover plate 3. The high-pressure gas is ejected out of the jet fuse through the pressure relief nozzle 10.

[0033] In this embodiment, the temperature-sensitive glass bulb 11 is arranged opposite to the bottom of the fuse tube 5. The temperature-sensitive glass bulb 11 blocks the inside of the pressure relief nozzle 10 to ensure the sealing of the entire jet fuse usually. When under the action of the arc high temperature, the temperature-sensitive glass bulb inside the tube breaks, and the high-pressure gas can escape from the pressure relief port, thereby reducing the pressure inside the cavity.

[0034] In this embodiment, there are two sets of fixing seats 12, which are respectively located on the left and right sides of the housing 2, and the fixing seats 12 are located at the upper side of the sealing cover plate 3 to avoid affecting the sealing cover plate 3.

[0035] In this embodiment, the telescopic spring 13 is arranged vertically, and the upper end of the telescopic spring 13 abuts against the bottom of the fairing 9. When the fairing 9 is impacted by the high-pressure air flow, the telescopic springs 13 at the left and right ends of the bottom of the fairing 9 are compressed by the force, which can buffer the fairing 9, avoid the fairing 9 being directly ejected outward with the high-pressure air flow, and can reduce the risk of the sealing cover plate 3 being bounced off, reducing the potential problem of damage to nearby equipment and personnel.

Claims

1. A jet fuse device, characterized in that, Including: Porcelain bushing (1), housing (2), sealing cover plate (3), contact tube (4), fuse carrier tube (5), upper terminal (6), lower terminal (7), contact (8), flow guide cover (9), pressure relief nozzle (10), temperature-sensitive glass bulb (11), fixing seat (12) and telescopic spring (13). The housing (2) is installed at the bottom of the porcelain bushing (1), the sealing cover plate (3) is installed at the bottom of the housing (2), the contact tube (4) is installed inside the porcelain bushing (1), the fuse carrier tube (5) is installed inside the contact tube (4), the upper terminal (6) is installed at the top of the porcelain bushing (1), the lower terminal (7) is installed at the lower side of the porcelain bushing (1), the contact (8) is installed at the lower end inside the porcelain bushing (1), the flow guide cover (9) is installed inside the housing (2), the pressure relief nozzle (10) is installed at the lower end of the flow guide cover (9), the temperature-sensitive glass bulb (11) is installed inside the pressure relief nozzle (10), the fixing seat (12) is installed at the lower end inside the housing (2), and the telescopic spring (13) is installed at the upper end of the fixing seat (12).

2. The jet fuse device according to claim 1, characterized in that: The flow guide cover (9) is located at the upper opening of the housing (2), and the flow guide cover (9) is facing the opening between the flow guide cover (9) and the pressure relief nozzle (10).

3. The jet fuse device according to claim 1, characterized in that: The flow guide cover (9) is hemispherical, and the flow guide cover (9) is made of ceramic material.

4. The jet fuse device according to claim 1, characterized in that: The pressure relief nozzle (10) is located in the middle of the flow guide cover (9), and the pressure relief nozzle (10) is communicated with the flow guide cover (9).

5. The jet fuse device according to claim 1, characterized in that: The pressure relief nozzle (10) extends vertically downward through the sealing cover plate (3) and extends into the inside of the sealing cover plate (3).

6. The jet fuse device according to claim 1, wherein: The temperature-sensitive glass bulb (11) is arranged opposite to the bottom of the fuse carrier tube (5).

7. The jet fuse device according to claim 1, characterized in that: There are two groups of fixing seats (12), and the two groups of fixing seats (12) are respectively located on the left and right sides of the housing (2), and the fixing seat (12) is located at the upper side of the sealing cover plate (3).

8. The jet fuse device according to claim 1, characterized in that: The telescopic spring (13) is arranged vertically, and the upper end of the telescopic spring (13) abuts against the bottom of the flow guide cover (9).

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