A pressure relief protection structure for power distribution cabinet

Abstract

The present application belongs to the technical field of airtight protection equipment for power distribution, and in particular relates to a pressure relief protection structure for a power distribution cabinet. It includes a T-tube, a pressure-bearing part, a threaded pressure regulating cylinder, a speed-limiting screw, an anti-return buffer block, a plug, a compression spring, and a support nut. The pressure relief protection structure for the power distribution cabinet of the present application is simple and compact as a whole, with few parts. It can be used as an air pressure regulating device for a closed power distribution cabinet. By connecting the internal and external spaces, it can realize flexible regulation of the pressure relief pressure and the pressure relief rate, and can be used for various types of power distribution cabinet products. It improves its stability when used in high humidity and high dust environments, balances the internal and external air pressure, prevents internal pressure imbalance, can quickly open the pressure relief when the air pressure changes suddenly, and can close and slowly restore the pressure after the air pressure decreases.

Description

Technical Field

[0001] The present application belongs to the technical field of airtight protective equipment for power distribution, and in particular relates to a pressure relief protection structure for a power distribution cabinet. Background Art

[0002] The distribution cabinet has been used for a long time, and the multiple electrical components inside will cause large changes in regional temperature due to different working conditions and time. When the distribution cabinet is used in an area with high humidity or high dust density in the air, the repeated temperature changes are likely to cause water stains and dust accumulation, affecting the normal operation of the internal components. Therefore, when necessary, it is necessary to use sealed distribution cabinets and other equipment to isolate external moisture and flying dust. However, at the same time, this will lead to a relatively closed internal space. Affected by weather changes and temperature differences between day and night, the gas inside and outside the distribution cabinet may compress and expand, which may easily cause the distribution cabinet to deform. In particular, when the electrical components in the distribution cabinet generate a lot of heat in a short period of time due to discharge or damage, it is easy to cause a sharp increase in internal air pressure. Although a certain degree of internal sealing and high pressure are conducive to flame retardant arc extinguishing, when the pressure increases rapidly, it is easy to cause the distribution cabinet to be decoupled and damaged, the seal fails, and internal sparks and combustion intensify, which may easily lead to the deterioration of circuit faults such as short circuits. Summary of the Invention

[0003] The purpose of this application is to provide a distribution cabinet pressure relief protection structure that can be installed on the distribution cabinet and used for pressure relief and pressure control of the distribution cabinet, which can conveniently set the pressure relief size, realize constant pressure adjustment, as well as explosion-proof pressure and low-pressure buffer self-recovery functions.

[0004] To achieve the above objectives, this application adopts the following technical solutions.

[0005] A distribution cabinet pressure relief protection structure, comprising a T-shaped tube 1, a pressure-bearing part 2, a threaded pressure regulating cylinder 3, a speed-limiting screw 4, an anti-return buffer block 5, a plug 6, a compression spring 7, and a support nut 8;

[0006] The T-shaped tube 1 comprises a vertical tube body 1a disposed within the distribution cabinet, and a horizontal tube body 1b extending through the distribution cabinet. A strip-shaped air outlet passage 1c extending in the same direction as the vertical tube body 1a is provided within the horizontal tube body 1b. The strip-shaped air outlet passage 1c communicates with the vertical tube body 1a and forms a strip-shaped air outlet 1d on the inner wall of the vertical tube body 1a.

[0007] The pressure-bearing member 2 is an inverted T-shaped structure, with a pressure-bearing portion 2a of a rotating body structure at the lower end. A connecting tube 2b is provided on the upper side of the pressure-bearing portion 2a. The pressure-bearing portion 2a matches the inner diameter of the opening at the lower end of the vertical tube body 1a.

[0008] The support nut 8 is airtightly connected to the upper opening of the vertical tube body 1a, and a mounting screw hole is provided in the center of the support nut 8;

[0009] The threaded pressure regulating cylinder 3 is screwed into the mounting screw hole, and the compression spring 7 is sleeved on the connecting cylinder 2b with the upper end resting against the lower end of the threaded pressure regulating cylinder 3;

[0010] The speed limiting screw 4 is screwed into the threaded pressure regulating cylinder 3, and the lower end of the speed limiting screw 4 extends into the connecting cylinder 2b.

[0011] The front side of the transverse tube body 1b is provided with an installation cavity, which is connected to the strip-shaped air outlet channel 1c and the width of the bottom edge of the installation cavity exceeds the width of the strip-shaped air outlet channel 1c;

[0012] The anti-return buffer block 5 can be laterally slidably arranged in the installation cavity. The anti-return buffer block 5 includes a plurality of buffer plates 5a arranged vertically and parallel to each other. Adjacent buffer plates 5a are provided with connecting portions 5b. The connecting portions 5b are evenly provided with guide holes 5c at positions opposite to the strip-shaped air outlet channel 1c. The guide holes 5c in each connecting portion 5b are interconnected and pass through the buffer plates 5a on the front and rear sides. The buffer plates 5a are provided with pressure relief holes 5d. The pressure relief holes 5d are distributed outside the guide holes 5c and staggered with the strip-shaped air outlet channel 1c. When the innermost buffer plate 5a approaches the strip-shaped air outlet channel 1c, it is blocked.

[0013] The plug 6 is arranged at the opening of the horizontal tube body 1b, and the plug 6 is provided with an air outlet 6a connected to the installation cavity.

[0014] A further improvement or preferred implementation scheme of the aforementioned distribution cabinet pressure relief protection structure also includes an anti-slip nut 9a fastened to the lower end of the vertical tube body 1a; an anti-slip ring 9b is provided on the lower side of the anti-slip nut 9a to support the bottom of the pressure-bearing part 2a.

[0015] As a further improvement or preferred implementation scheme of the aforementioned distribution cabinet pressure relief protection structure, a breathing hole 2c is provided at the bottom of the pressure-bearing part 2a. The breathing hole 2c passes upward through the connecting tube 2b and communicates with the inner cavity of the vertical tube body 1a. The diameter of the breathing hole is 1~3mm.

[0016] A further improvement or preferred implementation scheme of the aforementioned distribution cabinet pressure relief protection structure further includes a filter 9c provided at the front opening of the installation cavity; the rear end of the plug 6 presses against the filter 9c to tighten it.

[0017] A further improvement or preferred embodiment of the aforementioned distribution cabinet pressure relief protection structure is that a first annular limiting portion 8a is provided in the middle of the support nut 8, and a sealing rubber ring is provided between the lower side of the first annular limiting portion 8a and the upper end opening of the vertical tube body 1a;

[0018] A second annular limiting portion 1e is provided at the rear of the transverse tube body 1b, and a sealing rubber ring is provided at the front side of the second annular limiting portion 1e;

[0019] The front end of the transverse tube body 1b is provided with an external thread connection section, a fixing nut is sleeved on the external thread connection section, and a sealing rubber ring is provided on the rear side of the fixing nut.

[0020] As a further improvement or preferred embodiment of the aforementioned distribution cabinet pressure relief protection structure, a butterfly-shaped operating handle 3a is provided at the upper end of the threaded voltage regulating cylinder 3 .

[0021] Its beneficial effects are:

[0022] The power distribution cabinet pressure relief protection structure of the present application is simple and compact as a whole, with few parts. It can be used as an air pressure regulating device for closed power distribution cabinets. By connecting the internal and external spaces, it can realize flexible regulation of the pressure relief pressure and pressure relief rate, and can be used for various types of power distribution cabinet products. It improves its stability in high humidity and high dust environments, balances the internal and external air pressures, prevents internal pressure imbalance, can quickly open the pressure relief when the air pressure changes suddenly, and can close and slowly restore the pressure after the air pressure decreases. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the pressure relief protection structure of the power distribution cabinet;

[0024] Figure 2 It is the assembly of the pressure relief protection structure of the distribution cabinet Figure 1 ;

[0025] Figure 3 It is the assembly of the pressure relief protection structure of the distribution cabinet Figure 2 ;

[0026] Figure 4 This is the installation diagram of the pressure relief protection structure of the power distribution cabinet (section view);

[0027] The reference numerals include:

[0028] T-shaped tube 1, vertical tube body 1a, horizontal tube body 1b, strip air outlet channel 1c, strip air outlet 1d, second annular limiting part 1e, installation cavity, pressure-bearing part 2, pressure-bearing part 2a, connecting tube 2b, breathing hole 2c, threaded pressure regulating tube 3, butterfly operating handle 3a, speed limiting screw 4, anti-return buffer block 5, buffer plate 5a, connecting part 5b, guide hole 5c, pressure relief hole 5d, plug 6, air outlet 6a, compression spring 7, support nut 8, first annular limiting part 8a, anti-slip nut 9a, anti-slip ring 9b, filter plate 9c, fixing nut. DETAILED DESCRIPTION

[0029] The present application is described in detail below with reference to specific embodiments.

[0030] The present invention discloses a pressure relief protection structure for a power distribution cabinet, primarily installed in sealed equipment such as enclosed power distribution cabinets in various public places, supermarkets, and dusty environments. It is designed to provide explosion and pressure resistance while ensuring the device's sealed isolation. While ensuring tightness, it allows the equipment to slowly balance pressure during normal operation, buffering sudden internal and external pressure fluctuations. In the event of an internal explosion or instantaneous heating from an arc, it rapidly relieves pressure to prevent explosion. After pressure relief is complete, it buffers incoming airflow, maintaining low pressure and oxygen deficiency inside the cabinet to achieve a flame retardant effect until internal and external pressure equilibrium is restored.

[0031] like Figure 1 、 Figure 2 As shown, the basic components of the pressure relief protection structure of the power distribution cabinet include T-shaped tube 1, pressure bearing part 2, threaded pressure regulating cylinder 3, speed limiting screw 4, anti-return buffer block 5, plug 6, compression spring 7, and support nut 8;

[0032] The T-shaped tube 1 comprises a vertical tube body 1a disposed within the distribution cabinet, and a horizontal tube body 1b extending through the distribution cabinet. A strip-shaped air outlet passage 1c extending in the same direction as the vertical tube body 1a is provided within the horizontal tube body 1b. The strip-shaped air outlet passage 1c communicates with the vertical tube body 1a and forms a strip-shaped air outlet 1d on the inner wall of the vertical tube body 1a.

[0033] The pressure-bearing member 2 is an inverted T-shaped structure, with a pressure-bearing portion 2a of a rotating body structure at the lower end. A connecting tube 2b is provided on the upper side of the pressure-bearing portion 2a. The pressure-bearing portion 2a matches the inner diameter of the opening at the lower end of the vertical tube body 1a.

[0034] The support nut 8 is airtightly connected to the upper opening of the vertical tube body 1a, and a mounting screw hole is provided in the center of the support nut 8;

[0035] The threaded pressure regulating cylinder 3 is screwed into the mounting screw hole, and the compression spring 7 is sleeved on the connecting cylinder 2b with the upper end resting against the lower end of the threaded pressure regulating cylinder 3;

[0036] The speed limiting screw 4 is screwed into the threaded pressure regulating cylinder 3, and the lower end of the speed limiting screw 4 extends into the connecting cylinder 2b.

[0037] The front side of the transverse tube body 1b is provided with an installation cavity, which is connected to the strip-shaped air outlet channel 1c and the width of the bottom edge of the installation cavity exceeds the width of the strip-shaped air outlet channel 1c;

[0038] The anti-return buffer block 5 can be laterally slidably arranged in the installation cavity. The anti-return buffer block 5 includes a plurality of buffer plates 5a arranged vertically and parallel to each other. Adjacent buffer plates 5a are provided with connecting portions 5b. The connecting portions 5b are evenly provided with guide holes 5c at positions opposite to the strip-shaped air outlet channel 1c. The guide holes 5c in each connecting portion 5b are interconnected and pass through the buffer plates 5a on the front and rear sides. The buffer plates 5a are provided with pressure relief holes 5d. The pressure relief holes 5d are distributed outside the guide holes 5c and staggered with the strip-shaped air outlet channel 1c. When the innermost buffer plate 5a approaches the strip-shaped air outlet channel 1c, it is blocked.

[0039] The plug 6 is arranged at the opening of the horizontal tube body 1b, and the plug 6 is provided with an air outlet 6a connected to the installation cavity.

[0040] In order to ensure the integrity of the overall structure, prevent the pressure-bearing parts from falling, and ensure the sealing of the overall mechanism, this application also includes an anti-slip nut 9a that is buckled on the lower end of the vertical tube body 1a; an anti-slip ring 9b is provided on the lower side of the anti-slip nut 9a to support the bottom of the pressure-bearing part 2a.

[0041] In order to ensure that the device can maintain and restore internal and external balance when the air pressure changes slightly during normal operation, in this embodiment, a breathing hole 2c is provided at the bottom of the pressure-bearing part 2a. The breathing hole 2c passes upward through the connecting tube 2b and is connected to the inner cavity of the vertical tube body 1a. The diameter of the breathing hole is 1~3mm.

[0042] To purify the gas entering the distribution cabinet and prevent foreign matter from entering the device, this embodiment also includes a filter 9c arranged at the front opening of the installation cavity; the rear end of the plug 6 presses the filter 9c tightly. The filter point is made of porous material.

[0043] A first annular limiting portion 8a is provided in the middle of the support nut 8, and a sealing rubber ring is provided between the lower side of the first annular limiting portion 8a and the upper end opening of the vertical tube body 1a;

[0044] A second annular limiting portion 1e is provided at the rear of the transverse tube body 1b, and a sealing rubber ring is provided at the front side of the second annular limiting portion 1e;

[0045] The front end of the transverse tube body 1b is provided with an external thread connection section, a fixing nut is sleeved on the external thread connection section, and a sealing rubber ring is provided on the rear side of the fixing nut.

[0046] The upper end of the threaded pressure regulating cylinder 3 is provided with a butterfly-shaped operating handle 3a.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the scope of protection of the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application may be modified or replaced by equivalents without departing from the essence and scope of the technical solutions of the present application.

Claims

1. A power distribution cabinet pressure relief protection structure, characterized in that: It includes a T-shaped tube (1), a pressure-bearing member (2), a threaded pressure-regulating cylinder (3), a speed-limiting screw (4), an anti-return buffer block (5), a plug (6), a compression spring (7), and a support nut (8); The T-shaped tube (1) comprises: a vertical tube body (1a) arranged inside the power distribution cabinet, and a horizontal tube body (1b) penetrating from the power distribution cabinet body; a strip-shaped air outlet channel (1c) extending in the same direction as the vertical tube body (1a) is provided in the horizontal tube body (1b); the strip-shaped air outlet channel (1c) is communicated with the vertical tube body (1a) and forms a strip-shaped air outlet (1d) on the inner wall of the vertical tube body (1a); The pressure-bearing member (2) has an inverted T-shaped structure, the lower end of which is a pressure-bearing portion (2a) of a rotating body structure, and a connecting tube (2b) is provided on the upper side of the pressure-bearing portion (2a); the pressure-bearing portion (2a) matches the inner diameter of the opening at the lower end of the vertical tube body (1a); The support nut (8) is airtightly connected to the upper opening of the vertical tube body (1a), and a mounting screw hole is provided at the center of the support nut (8); The threaded pressure regulating cylinder (3) is screwed into the mounting screw hole, and the compression spring (7) is sleeved on the connecting cylinder (2b) with the upper end resting against the lower end of the threaded pressure regulating cylinder (3); The speed limiting screw (4) is screwed into the threaded pressure regulating cylinder (3), and the lower end of the speed limiting screw (4) extends into the connecting cylinder (2b); A mounting cavity is provided on the front side of the transverse tube body (1b), the mounting cavity is in communication with the strip-shaped air outlet channel (1c), and the width of the bottom edge exceeds the width of the strip-shaped air outlet channel (1c); The anti-return buffer block (5) can be arranged in the installation cavity in a transversely slidable manner. The anti-return buffer block (5) includes a plurality of buffer plates (5a) arranged vertically and parallel to each other, and adjacent buffer plates (5a) are provided with connecting parts (5b); the connecting parts (5b) are evenly provided with guide holes (5c) at positions opposite to the strip-shaped air outlet channel (1c), and the guide holes (5c) in each connecting part (5b) are interconnected and pass through the buffer plates (5a) on the front and rear sides; the buffer plates (5a) are provided with pressure relief holes (5d), which are distributed outside the guide holes (5c) and staggered with the strip-shaped air outlet channel (1c). When the innermost buffer plate (5a) approaches the strip-shaped air outlet channel (1c), it is blocked; The plug (6) is arranged at the opening of the transverse tube body (1b), and the plug (6) is provided with an air outlet (6a) that is in communication with the installation cavity.

2. A distribution cabinet pressure relief protection structure according to claim 1, characterized in that: It also includes an anti-slip nut (9a) buckled on the lower end of the vertical tube body (1a); an anti-slip ring (9b) capable of supporting the bottom of the pressure-bearing part (2a) is provided on the lower side of the anti-slip nut (9a).

3. A distribution cabinet pressure relief protection structure according to claim 1, characterized in that: A breathing hole (2c) is provided at the bottom of the pressure-bearing portion (2a). The breathing hole (2c) passes upward through the connecting tube (2b) and communicates with the inner cavity of the vertical tube body (1a). The diameter of the breathing hole is 1-3 mm.

4. A distribution cabinet pressure relief protection structure according to claim 1, characterized in that: It also includes a filter plate (9c) arranged at the front opening of the installation cavity; the rear end of the plug (6) presses against the filter plate (9c) to tighten it.

5. A distribution cabinet pressure relief protection structure according to claim 1, characterized in that: A first annular limiting portion (8a) is provided in the middle of the support nut (8), and a sealing rubber ring is provided between the lower side of the first annular limiting portion (8a) and the upper end opening of the vertical tube body (1a); A second annular limiting portion (1e) is provided at the rear of the transverse tube body (1b), and a sealing rubber ring is provided at the front side of the second annular limiting portion (1e); The front end of the transverse tube body (1b) is provided with an external thread connection section, a fixing nut is sleeved on the external thread connection section, and a sealing rubber ring is provided on the rear side of the fixing nut.

6. A distribution cabinet pressure relief protection structure according to claim 1, characterized in that: A butterfly-shaped operating handle (3a) is provided at the upper end of the threaded pressure regulating cylinder (3).

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