A two-way breather valve for sealed packaging boxes
By designing a two-way breathing valve that integrates the intake and exhaust valves, and using a double spring structure and adjusting nut to control the valve opening pressure, the gas regulation problem of sealed packaging boxes when the air pressure difference changes is solved, achieving automatic adjustment and cost reduction.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANXI XINHUA CHEM
- Filing Date
- 2025-06-30
- Publication Date
- 2026-07-14
AI Technical Summary
The safety valves of existing sealed packaging boxes cannot effectively regulate gas flow when the pressure difference between the inside and outside changes, which may cause the packaging boxes to be damaged when the temperature changes.
Design a two-way breathing valve that integrates the intake valve and exhaust valve into one unit. Utilize a double spring structure and adjusting nut to control the valve's opening pressure, thereby achieving automatic adjustment under the pressure difference between the inside and outside air.
It enables automatic air intake or exhaust under different air pressure environments, improving installation efficiency, reducing costs, adapting to various environments, and avoiding damage to the packaging box.
Smart Images
Figure CN224497599U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of safety valves for packaging boxes, specifically to a two-way breather valve for sealed packaging boxes. Background Technology
[0002] Commonly used safety valves, also known as automatic pressure relief valves, are employed in sealed packaging boxes. When the internal air pressure is too high, the valve automatically opens, releasing air from the box. When the internal pressure drops to a certain value, the valve closes, sealing the box. However, this type of sealed packaging box is only effective when the external temperature rises or the box is transported to a high-altitude area, causing the internal air pressure to exceed a certain external pressure. When the external temperature drops or the box is transported from a high-altitude area to a low-altitude area, causing the internal air pressure to fall below a certain external pressure, the safety valve becomes ineffective. The box often relies on its own strength and rigidity to withstand the pressure difference, which can easily damage the box and its contents when the pressure difference exceeds a certain value. To address this issue, some manufacturers install two safety valves or an additional reverse pressure relief valve, which makes installation difficult and increases costs. Summary of the Invention
[0003] This invention addresses the problem that existing packaging box safety valves cannot simultaneously allow exhaust gas from the box and allow outside air to enter the box under pressure differential. It provides a two-way breather valve for sealed packaging boxes. By combining the inlet and outlet valves into a single valve, the overall valve structure is optimized, resulting in a simple structure, convenient installation, significantly improved installation efficiency, and reduced processing costs.
[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: a two-way breathing valve for sealed packaging boxes, including a valve body, a valve cover installed on the top outer side of the valve body, an adjusting nut II screwed on the top inner side wall of the valve body, an adjusting nut I screwed on the bottom inner side wall of the valve body, and a connecting rod, a valve core II, and a valve core I are arranged sequentially from top to bottom in the valve body cavity between the adjusting nut II and the adjusting nut I.
[0005] The valve core II includes a stepped cylinder that is wider at the top and narrower at the bottom. The small-diameter end of the stepped cylinder is sealed and extends upward at the center to form a cylinder. The lower part of the connecting rod and the outer side of the cylinder of the valve core II are fitted with a compression spring I. The compression spring I is compressed in the cavity formed by the adjusting nut II and the stepped cylinder. The bottom of the connecting rod is threadedly connected to the top of the cylinder of the valve core II. The top part of the connecting rod extends out of the adjusting nut II and the valve cover.
[0006] The valve core I includes a stepped cylinder that is narrower at the top and wider at the bottom. A circular partition is provided between the stepped cylinders, and an exhaust hole is opened on the circular partition. The inner side of the top of the stepped cylinder is inclined, and an exhaust hole is also opened on the side wall of the large diameter end of the stepped cylinder. A compression spring II is embedded in the cavity formed between the large diameter end of the stepped cylinder and the adjusting nut I.
[0007] The valve cores II and I are respectively separated from the inner wall of the valve body by a gap of 0.2mm-0.5mm;
[0008] A sealing ring II is embedded at the bottom of the valve core II. The sealing ring II and the top inclined surface of the valve core I are in close contact under the action of the compression spring I to achieve a seal.
[0009] The inner wall of the valve body, corresponding to the top of valve core I, is also provided with a slope. A sealing ring III is embedded on the upper outer side of valve core I. The sealing ring III and the slope of the inner wall of the valve body are in close contact under the action of compression spring II to achieve sealing.
[0010] Furthermore, one end of the connecting rod extending out of the valve cover is hinged to a switch via a pin. The switch rotates along the pin to lift the connecting rod.
[0011] Furthermore, the upper part of the outer side wall of the valve body is provided with a radial protrusion end, and a sealing ring I is embedded in the lower part of the radial protrusion end.
[0012] Furthermore, a pressure ring is fitted on the outer wall of the valve body, and a locking nut is screwed on it.
[0013] Compared with the prior art, the present invention has the following beneficial effects:
[0014] This utility model is a dual-purpose intake and exhaust valve that integrates two valves with different functions, saving a lot of costs and space, and achieving obvious results. The valve core component consists of two parts, integrating the two functions into one component, which greatly reduces costs, is easy to operate, and is economical and practical.
[0015] This invention utilizes a double-spring combination structure to simultaneously achieve automatic air intake when the internal pressure of the sealed packaging box is less than a certain external pressure and automatic air exhaust when the internal pressure is greater than a certain external pressure.
[0016] This invention allows for the control of the spring's preload by adjusting adjusting nut I and adjusting nut II, thereby controlling the pressure at which the valve opens under positive or negative pressure, making it suitable for various working environments. Attached Figure Description
[0017] Figure 1 This is a cross-sectional structural diagram of the bidirectional breathing valve of this utility model.
[0018] Figure 2A schematic diagram of the cross-sectional structure of the utility model's bidirectional breathing valve during air release.
[0019] Figure 3 This is a three-dimensional structural diagram of valve core I.
[0020] The markings in the image are as follows:
[0021] 1-Pin; 2-Connecting rod; 3-Switch; 4-Valve cover; 5-Valve body; 6-Compression spring I; 7-Sealing ring I; 8-Pressure ring; 9-Sealing ring II; 10-Sealing ring III; 11-Locking nut; 12-Valve core I; 13-Compression spring II; 14-Adjusting nut I; 15-Valve core II; 16-Adjusting nut II. Detailed Implementation
[0022] The present invention will be further described below with reference to specific embodiments. Example
[0023] like Figure 1-3 As shown, a two-way breathing valve for a sealed packaging box includes a valve body 5, a valve cover 4 installed on the top outer side of the valve body 5, an adjusting nut II 16 screwed (threaded connection) onto the top inner side wall of the valve body 5, and an adjusting nut I 14 screwed onto the bottom inner side wall of the valve body 5. A connecting rod 2, a valve core II 15, and a valve core I 12 are arranged sequentially from top to bottom in the cavity of the valve body 5 between the adjusting nut II 16 and the adjusting nut I 14.
[0024] The valve core II15 includes a stepped cylinder that is wider at the top and narrower at the bottom. The small-diameter end of the stepped cylinder is sealed and extends upward at the center to form a cylinder. The lower part of the connecting rod 2 and the outer side of the cylinder of the valve core II15 are fitted with a compression spring I6. The compression spring I6 is compressed in the cavity formed by the adjusting nut II16 and the stepped cylinder. The bottom of the connecting rod 2 and the top of the cylinder of the valve core II15 are connected by a thread. The top part of the connecting rod 2 extends out of the adjusting nut II16 and the valve cover 4.
[0025] The valve core I12 includes a stepped cylinder that is narrower at the top and wider at the bottom. A circular partition is provided between the stepped cylinders, and an exhaust hole is opened on the circular partition. The inner side of the top of the stepped cylinder is inclined, and an exhaust hole is also opened on the side wall of the large diameter end of the stepped cylinder. A compression spring II13 is embedded in the cavity formed between the large diameter end of the stepped cylinder and the adjusting nut I14.
[0026] A gap of 0.2mm-0.5mm is left between the valve core II15 and the valve core I12 and the inner wall of the valve body 5, respectively.
[0027] A sealing ring II9 is embedded at the bottom of the valve core II15. The sealing ring II9 and the top inclined surface of the valve core I12 are in close contact under the action of the compression spring I6 to achieve a seal.
[0028] The inner wall of the valve body 5, corresponding to the top of the valve core I12, is also provided with a slope. A sealing ring III10 is embedded on the upper outer side of the valve core I12. The sealing ring III10 and the slope of the inner wall of the valve body 5 are in close contact under the action of the compression spring II13 to achieve a seal.
[0029] Adjusting nut I14 and adjusting nut II16 are used to adjust the preload of compression spring I6 and compression spring II13.
[0030] Furthermore, a switch 3 is hinged to one end of the connecting rod 2 extending out of the valve cover 4 via a pin 1. The switch 3 includes a handle, and a forked leg is provided at one end of the handle. The junction of the forked leg and the top of the connecting rod 2 are connected together by an insertion pin 1. Rotating the switch 3 along the pin 1 lifts the connecting rod 2.
[0031] Furthermore, the upper part of the outer side wall of the valve body 5 is provided with a radial protrusion, and a sealing ring I7 is embedded in the lower part of the radial protrusion.
[0032] Furthermore, a pressure ring 8 is fitted on the outer wall of the valve body 5, and a locking nut 11 is screwed on it. The pressure ring 8 and the locking nut 11 are used to connect and lock with the packaging box body.
[0033] The working process and principle of this utility model's bidirectional breathing valve are as follows:
[0034] When installing the two-way breather valve with the packaging box, the side containing the valve cover 4 is placed outside the packaging box, and the other side is placed inside the packaging box. It is then secured using a locking nut. The inclined surface in the middle of the valve body 5 engages with the sealing ring Ⅲ10 on the valve core I12 under the action of the compression spring Ⅱ13. When the air pressure inside the box is greater than the air pressure outside the box by a certain value, the air pressure inside the box acts on the valve core II15, causing the valve core II15 and valve core I12 to separate through the compression spring Ⅰ6, allowing the gas inside the box to flow out of the box through the exhaust hole at the top of the valve core I12. Furthermore, the inclined surface of the valve core I12 cooperates with the sealing ring Ⅱ9 of the valve core II1. When the air pressure inside the box is less than the air pressure outside the box by a certain value, the air pressure outside the box acts on the valve core I12 and valve core II15, causing the valve core I12 and the inclined surface of the inner wall of the valve body 5 to separate through the compression spring Ⅱ13, opening the passage. Gas flows into the box from outside through the hole on the side wall of the valve core I12. When it is necessary to release all the gas from the sealed packaging box, switch 3 can be turned. Switch 3 rotates the connecting rod 2 and lifts it, which in turn drives the valve core I12 to rise, opening the valve and allowing the gas to flow out.
Claims
1. A two-way breather valve for sealed packaging boxes, characterized in that, The valve body (5) includes a valve cover (4) installed on the top outer side of the valve body (5), an adjusting nut II (16) screwed onto the top inner wall of the valve body (5), and an adjusting nut I (14) screwed onto the bottom inner wall of the valve body (5). A connecting rod (2), a valve core II (15), and a valve core I (12) are arranged sequentially from top to bottom in the cavity of the valve body (5) between the adjusting nut II (16) and the adjusting nut I (14). The valve core II (15) includes a stepped cylinder that is wider at the top and narrower at the bottom. The small diameter end of the stepped cylinder is sealed and extends upward at the center to form a cylinder. The lower part of the connecting rod (2) and the outer side of the cylinder of the valve core II (15) are fitted with a compression spring I (6). The compression spring I (6) is compressed in the cavity formed by the adjusting nut II (16) and the stepped cylinder. The bottom of the connecting rod (2) is threadedly connected to the top of the cylinder of the valve core II (15). The top part of the connecting rod (2) extends out of the adjusting nut II (16) and the valve cover (4). The valve core I (12) includes a stepped cylinder that is narrow at the top and wide at the bottom. A circular partition is provided between the stepped cylinders, and an exhaust hole is opened on the circular partition. The inner side of the top of the stepped cylinder is a slope, and an exhaust hole is also opened on the side wall of the large diameter end of the stepped cylinder. A compression spring II (13) is embedded in the cavity formed between the large diameter end of the stepped cylinder and the adjusting nut I (14). The valve cores II (15) and I (12) are respectively separated from the inner wall of the valve body (5) by a gap of 0.2mm-0.5mm; The bottom of the valve core II (15) is fitted with a sealing ring II (9), and the sealing ring II (9) and the top inclined surface of the valve core I (12) are in close contact under the action of the compression spring I (6) to achieve sealing; The inner wall of the valve body (5) at the position corresponding to the top of the valve core I (12) is also provided with a slope. A sealing ring III (10) is embedded on the upper outer side of the valve core I (12). The sealing ring III (10) and the slope of the inner wall of the valve body (5) are in close contact under the action of the compression spring II (13) to achieve sealing.
2. The two-way breather valve for sealed packaging boxes according to claim 1, characterized in that, The end of the connecting rod (2) extending out of the valve cover (4) is hinged to a switch (3) via a pin (1). The switch (3) rotates along the pin (1) to lift the connecting rod (2).
3. The two-way breather valve for a sealed packaging box according to claim 1, characterized in that, The upper part of the outer side wall of the valve body (5) is provided with a radial protrusion end, and a sealing ring I (7) is embedded in the lower part of the radial protrusion end.
4. The two-way breather valve for a sealed packaging box according to claim 1, characterized in that, A pressure ring (8) is also fitted on the outer wall of the valve body (5), and a locking nut (11) is screwed on it.