Breathing structure for balancing internal air pressure of explosion-proof box body

Abstract

The utility model discloses a breathing structure for balancing internal air pressure of an explosion-proof box body, which comprises a main body part, the main body part comprises a limiting part and a step part, the limiting part is provided with a first thread section, and the end part of the step part is provided with a second thread section; an inner cavity extending towards the end part of the step part is formed in the main body part, and a first air hole is formed in the bottom surface of the inner cavity; a sleeve assembly with the adjacent gap smaller than 0.4 mm is installed in the inner cavity, a fastening nut is arranged on the second threaded section in a screwed mode, and a breathable plate abutting against the sleeve assembly and a spring pressing the breathable plate are arranged in the fastening nut. A second air hole is formed in the fastening nut; the problems that air pressure in the explosion-proof box body is balanced, and devices are damaged due to internal pressure rise are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the inside air pressure regulation technical field of box, especially relates to a breathing structure that equalizes the inside air pressure of explosion -proof box. BACKGROUND

[0002] The explosion -proof box body is integrated with various circuit devices, and the explosion -proof box body has good sealing property, heat is generated in the operation process of internal components, which leads to the temperature rise of the box body, and the internal air pressure also rises, and the service life of part of components can be damaged under the condition of long -term internal pressure, the risk caused by the internal air pressure rise can be avoided by keeping the internal and external air pressure of the box body balanced. UTILITY MODEL CONTENTS

[0003] The utility model discloses a breathing structure that equalizes the inside air pressure of explosion -proof box, and solves the problem of the inside air pressure balance of explosion -proof box and avoids the damage of device caused by the internal pressure rise.

[0004] In order to realize the above -mentioned purpose, the utility model provides the following technical scheme:

[0005] A breathing structure that equalizes the inside air pressure of explosion -proof box, including main part, the main part includes spacing part and step part, be equipped with the first threaded section on the spacing part, the end of step part is equipped with the second threaded section, the main part is set up with the inner chamber that extends towards the end of step part, the bottom surface of inner chamber is set up with the first gas hole, the sleeve assembly of adjacent gap less than 0.4mm is installed in the inner chamber, the gas check plate that abuts on sleeve assembly and the spring that tightens gas check plate are equipped with in the tight -fitting nut of second threaded section, be equipped with the second gas hole on the tight -fitting nut.

[0006] Preferably, the sleeve assembly includes a mandrel and a first sleeve fitted on the mandrel, a second sleeve fitted on the first sleeve, a third sleeve fitted on the second sleeve, a fourth sleeve fitted on the third sleeve, and the fitting gaps are all less than 0.4mm; the fitting gap between the fourth sleeve and the inner chamber is less than 0.4mm.

[0007] Preferably, the first threaded section is provided with a plurality of cutting surfaces arranged circumferentially, and a decorative cover is fitted on the first threaded section.

[0008] Preferably, the cross section of the first threaded section is provided with staggered notch structures.

[0009] Preferably, the gas check plate is provided with a plurality of third gas holes arranged in an array.

[0010] Preferably, the step part is provided with a first explosion -proof surface between the first threaded section and the second threaded section.

[0011] Preferably, outer surfaces of the core shaft, the first sleeve, the second sleeve, the third sleeve, and the fourth sleeve are all second explosion-proof surfaces.

[0012] Preferably, the locking nut is provided with a wrench fitting surface for facilitating position limiting.

[0013] Beneficial effects:

[0014] The main body is matched with the explosion-proof box through the step portion and meets the explosion-proof clearance requirements. A sleeve assembly with an adjacent gap of less than 0.4mm is placed in the inner cavity of the main body and the sleeve assembly is pressed by the spring and the breathable plate. The sleeve assembly is tightened by tightening the set nut on the second threaded section to ensure that the internal explosion-proof clearance meets the requirements.

[0015] At the same time, a first air vent and a second air vent are respectively provided on the bottom surface of the inner cavity and the fixing nut, thereby forming a breathing passage connecting the inside and the outside and with a gap meeting the explosion-proof requirements;

[0016] When the air pressure inside the explosion-proof box rises, the gas is exhausted outward along the breathing channel. When the internal air pressure drops to form a negative pressure, the external gas is replenished inward along the breathing channel, thereby maintaining a balanced air pressure inside the explosion-proof box, protecting the internal components, and not affecting the changes in the explosion-proof conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic structural diagram of an embodiment of the present utility model;

[0018] Figure 2 This is a schematic cross-sectional view of an embodiment of the present invention;

[0019] Figure 3 This is a schematic diagram of the explosion structure of an embodiment of the utility model;

[0020] Figure 4 This is a schematic structural diagram of the main body from a first perspective in an embodiment of the present utility model;

[0021] Figure 5 This is a schematic structural diagram of the main body from a second viewing angle in an embodiment of the present utility model;

[0022] Figure 6 This is a schematic structural diagram of a fixing nut in an embodiment of the present utility model;

[0023] exist Figures 1 to 6 In the figure, the corresponding relationship between the component names or lines and the figure numbers is as follows:

[0024] The main body part 1, the limiting part 2, the step part 3, the first threaded section 4, the second threaded section 5, the inner cavity 6, the first air hole 7, the sleeve assembly 8, the mandrel 81, the first sleeve 82, the second sleeve 83, the third sleeve 84, the fourth sleeve 85, the jam nut 9, the air permeable plate 10, the spring 11, the second air hole 12, the cut surface 13, the decorative cover 14, the notch structure 15, the third air hole 16, and the wrench matching surface 17. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments.

[0026] Referring to Figures 1-6 The embodiment of the utility model discloses a breathing structure for balancing the internal air pressure of an explosion-proof box body, which comprises a main body part 1, wherein the main body part 1 comprises a limiting part 2 and a step part 3, the limiting part 2 is provided with a first threaded section 4, the end of the step part 3 is provided with a second threaded section 5, the step part 3 is matched with the explosion-proof box body to realize installation and meet the explosion-proof condition, a first explosion-proof surface is arranged between the first threaded section 4 and the second threaded section 5 on the step part 3, and the matching gap and the matching length between the first explosion-proof surface and the explosion-proof box body can meet the explosion-proof requirement.

[0027] The main body part 1 is provided with an inner cavity 6 extending towards the end of the step part 3, the bottom surface of the inner cavity 6 is provided with a first air hole 7, a sleeve assembly 8 with an adjacent gap of less than 0.4 mm is arranged in the inner cavity 6, a jam nut 9 is arranged on the second threaded section 5, the jam nut 9 is provided with an air permeable plate 10 abutting against the sleeve assembly 8 and a spring 11 pressing the air permeable plate 10, the sleeve assembly 8 is pressed in the inner cavity 6 by the spring 11 through the air permeable plate 10 after the jam nut 9 is screwed, the adjacent matching gap is less than 0.4 mm, the explosion-proof condition can be met under the condition of ensuring the matching length, and the jam nut 9 is provided with a second air hole 12.

[0028] Therefore, the breathing channel formed by the first air hole 7, the inner cavity 6, the sleeve assembly 8 and the second air hole 12 is communicated under the condition of meeting the explosion-proof condition, and the explosion-proof condition can be met under the condition of realizing gas circulation.

[0029] In order to facilitate the rotation of the jam nut 9, the jam nut 9 is provided with a wrench matching surface 17 facilitating limiting.

[0030] When the internal components generate heat during operation, causing the internal air pressure to rise, the air is discharged outward through the breathing channel to maintain the internal pressure at normal pressure.

[0031] The sleeve assembly 8 is used to meet the gas flow and meet the explosion-proof condition, and specifically comprises a mandrel 81, a first sleeve 82 sleeved on the mandrel 81, a second sleeve 83 sleeved on the first sleeve 82, a third sleeve 84 sleeved on the second sleeve 83, and a fourth sleeve 85 sleeved on the third sleeve 84, and the cooperation gaps are all less than 0.4 mm, and the cooperation gap between the fourth sleeve 85 and the inner cavity 6 is less than 0.4 mm; the cooperation gaps between the sleeves are all within the range of the explosion-proof condition, and only the length needs to be met, and the length is related to the thickness of the explosion-proof box body, and the length requirement in the explosion-proof condition is met at the same time.

[0032] Meanwhile, a plurality of cut surfaces 13 are arranged on the first threaded section 4 in the circumferential direction, and a decorative cover 14 is sleeved on the first threaded section 4, and there is a gap between the decorative cover 14 and the first threaded section 4 after the decorative cover 14 is screwed, so that the gas flow is met, and the decorative cover 14 is used to shield the first gas permeable hole 7 to realize the water release function, so that the gas flows from the side. Moreover, the cut surfaces 13 can also be used to limit the main body 1 during the tightening of the locking nut 9.

[0033] In order to ensure the gas flow, the first threaded section 4 is provided with staggered notch structures 15, and the side flowing gas is further guided by the notch structures 15 to realize smooth flow.

[0034] Specifically, the gas permeable plate 10 is used to press the sleeve assembly 8, and generally does not cause end face sealing, in order to avoid causing gas flow resistance, the third gas permeable hole 16 is arranged on the gas permeable plate 10.

[0035] Meanwhile, the outer surfaces of the mandrel 81, the first sleeve 82, the second sleeve 83, the third sleeve 84 and the fourth sleeve 85 are all second explosion-proof surfaces, and all need to meet the surface finish of the explosion-proof condition.

[0036] In the utility model, unless another definite provision and limitation, the terms "mounting", "connection", "connecting", "fixing" and the like terms should be understood in a broad sense, for example, can be fixed connection, also can be detachable connection, or be integrated; can be mechanical connection, also can be electrical connection; can be directly connected, also can be indirectly connected through intermediate medium, can be the communication or interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to specific circumstances.

[0037] In the description of the utility model, it is necessary to explain that the orientation or position relation indicated by the terms "center", "upper", "lower", "left", "right", "inner", "outer" and the like is the orientation or position relation based on the drawing shown, or is the orientation or position relation that the utility model product is usually placed in use, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element indicated must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the utility model. In addition, the terms "first", "second" and the like are only used for distinguishing description, and cannot be understood as indicating or implying relative importance.

[0038] It is obvious for those skilled in the art that the utility model is not limited to the details of the above-mentioned exemplary embodiments, and can be realized in other specific forms without departing from the spirit or basic characteristics of the utility model. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-limiting, and the scope of the utility model is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the utility model. Any figure reference in the claims should not be regarded as limiting the claims involved.

Claims

1. A breathing structure for balancing the internal air pressure of an explosion-proof box, characterized by: The main body comprises a limiting portion and a step portion, the limiting portion is provided with a first thread segment, and the end of the step portion is provided with a second thread segment; The main body is provided with an inner cavity extending toward the end of the step portion, and the bottom surface of the inner cavity is provided with a first air vent; A sleeve assembly with adjacent gaps less than 0.4 mm is installed in the inner cavity, a set nut is screwed onto the second threaded section, and a breathable plate abutting against the sleeve assembly and a spring for pressing the breathable plate are provided in the set nut; The fixing nut is provided with a second air hole.

2. A breathing structure for equalizing the internal air pressure of an explosion-proof box according to claim 1, characterized in that: The sleeve assembly includes a core shaft and a first sleeve sleeved on the core shaft, the first sleeve is sleeved on the second sleeve, the second sleeve is sleeved on the third sleeve, and the third sleeve is sleeved on the fourth sleeve, and the fitting clearance is less than 0.4 mm; The fitting clearance between the fourth sleeve and the inner cavity is less than 0.4 mm.

3. A breathing structure for equalizing the internal air pressure of an explosion-proof box according to claim 2, characterized in that: The first thread segment is provided with a plurality of cut surfaces arranged along the circumferential direction, and the first thread segment is sleeved with a decorative cover.

4. A breathing structure for equalizing the internal air pressure of an explosion-proof box according to claim 3, characterized in that: The cross section of the first thread segment is provided with a staggered notch structure.

5. A breathing structure for equalizing the internal air pressure of an explosion-proof box according to any one of claims 2 to 4, characterized in that: The air permeable plate is provided with an array of third air permeable holes.

6. A breathing structure for equalizing the internal air pressure of an explosion-proof box according to claim 5, characterized in that: The step portion is provided with a first explosion-proof surface located between the first thread segment and the second thread segment.

7. The breathing structure for equalizing the internal air pressure of an explosion-proof box according to claim 5, characterized in that: The outer surfaces of the core shaft, the first sleeve, the second sleeve, the third sleeve and the fourth sleeve are all second explosion-proof surfaces.

8. The breathing structure for equalizing the internal air pressure of an explosion-proof box according to claim 5, characterized in that: The set nut is provided with a wrench fitting surface for facilitating position limiting.

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