阅读说明：本技术 一种密封包装箱用呼吸阀 (Breather valve for sealed packaging box ) 是由 申星 毛羿 刘小平 张凯 李军卫 索涛 贾占虹 王凤誉 李世勇 曲俊良 于 2021-07-16 设计创作，主要内容包括：发明涉及包装领域,具体涉及一种密封包装箱用呼吸阀；包括旋配在一起阀体Ⅰ和阀体Ⅱ,阀体Ⅰ和阀体Ⅱ的内部腔体相连通,阀体Ⅰ的内侧壁上旋配有堵盖,阀体Ⅱ的内部腔体内装有活塞,活塞的活塞轴延伸至阀体Ⅰ的内部腔体中且穿过堵盖,穿过堵盖的活塞轴一端的外侧设有螺纹,并通过螺纹套接有坐垫,堵盖与活塞之间的活塞轴上套设有孔板,孔板和坐垫朝向堵盖的一端均沿活塞轴形成延伸段,坐垫与孔板的延伸段上共同套设有小簧,所述堵盖与孔板装设有套在小簧外侧的大簧,所述孔板与活塞端盖和阀体Ⅱ之间设有密封圈Ⅱ；本发明利用双弹簧的组合结构能够同时实现密封包装箱内压小于外压一定值时的自动进气功能及内压大于外压一定值时的自动排气功能。(The invention relates to the field of packaging, in particular to a breather valve for a sealed packaging box; the sealing device comprises a valve body I and a valve body II which are matched together in a rotating mode, the inner cavities of the valve body I and the valve body II are communicated, a plugging cover is matched on the inner side wall of the valve body I in a rotating mode, a piston is arranged in the inner cavity of the valve body II, a piston shaft of the piston extends into the inner cavity of the valve body I and penetrates through the plugging cover, threads are arranged on the outer side of one end of the piston shaft penetrating through the plugging cover, a cushion is sleeved with a cushion through the threads, a pore plate is sleeved on the piston shaft between the plugging cover and the piston, one ends, facing the plugging cover, of the pore plate and the cushion form an extension section along the piston shaft, a small spring is sleeved on the extension sections of the cushion and the pore plate together, a large spring sleeved on the outer side of the small spring is installed on the plugging cover and the pore plate, and a sealing ring II is arranged between the pore plate, a piston end cover and the valve body II; the invention can realize the automatic air inlet function when the internal pressure of the sealed packing box is less than a certain value of external pressure and the automatic air outlet function when the internal pressure is more than a certain value of external pressure at the same time by utilizing the combined structure of the double springs.)

1. A breather valve for a sealed packing box is characterized by comprising a valve body I (1) and a valve body II (10) which are matched together in a rotating mode, wherein the inner cavity of the valve body I (1) is communicated with the inner cavity of the valve body II (10), a plugging cover (4) is matched on the inner side wall of the valve body I (1) in a rotating mode, the plugging cover (4) is a perforated annular plate, two annular steps are arranged inside the valve body II (10) and are respectively a first annular step and a second annular step, a piston (9) is arranged in the inner cavity of the valve body II (10), a piston (9) is in clearance fit in the valve body II (10), a piston shaft of the piston (9) extends into the inner cavity of the valve body I (1) and penetrates through the plugging cover (4), a thread is arranged on the outer side of one end of the piston shaft penetrating through the plugging cover (4), a cushion (2) is sleeved through the thread, and a pore plate (7) is sleeved on the piston shaft between the plugging cover (4) and the piston (9), orifice plate (7) and cushion (2) all form the extension section along the piston shaft towards the one end of blanking cover (4), the common cover is equipped with little spring (3) on the extension section of cushion (2) and orifice plate (7), big spring (5) of cover in little spring (3) outside are installed with orifice plate (7) in blanking cover (4), be equipped with between the annular ladder terminal surface of second of orifice plate (7) and piston end cover and valve body II (10) sealing washer II (8).

2. The breather valve for the sealed package box according to claim 1, wherein one end of the valve body I (1) is embedded into the valve body II (10) and is in threaded connection with the inner side wall of the valve body II (10), a sealing ring I (6) is arranged between the valve body I (1) and the valve body II (10), and the sealing ring I (6) is arranged between the end face of the valve body I (1) and the end face of the first annular step.

3. A breather valve for a sealed package according to claim 2, wherein the diameter of the portion of the valve body i (1) extending out of the valve body ii (10) is smaller than the portion embedded in the valve body ii (10).

4. The breather valve for the sealed package box according to claim 1, wherein an annular groove is formed in the end face, close to the piston end cover, of the orifice plate (7), and the annular groove is used for placing a sealing ring II (8).

Technical Field

The invention relates to the field of packaging, in particular to a breather valve for a sealed packaging box.

Background

The safety valve is opened automatically when the air pressure in the box body is too high, the box body exhausts air outwards, when the air pressure in the box body is reduced to a certain value, the safety valve is closed to realize the sealing function of the packing box, but the safety valve is only suitable for the safety valve for automatically relieving the pressure when the air pressure in the box body exceeds the external air pressure by a certain value when the external air temperature of the packing box is increased or the packing box is transported to a high altitude area, but when the external air temperature of the packing box is reduced or the air pressure in the box body is lower than the external air pressure by a certain value when the external air temperature of the packing box is reduced or the packing box is transported from the high altitude area to a low altitude area, the safety valve does not work, the pressure caused by the internal and external pressure difference is resisted by the strength and rigidity of the packing box, and the packing box and the contents are easily damaged when the internal and external pressure difference exceeds a certain value.

Disclosure of Invention

The invention aims to solve the technical problems that an automatic pressure release valve for a sealed packaging box cannot be opened in two directions and the risk of damage to the packaging box and contents is caused, and provides a breather valve for the sealed packaging box.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a breather valve for a sealed packing box comprises a valve body I and a valve body II which are matched together in a rotating mode, the inner cavities of the valve body I and the valve body II are communicated, a plugging cover is matched on the inner side wall of the valve body I in a rotating mode, the plugging cover is a perforated annular plate, two annular steps which are a first annular step and a second annular step are arranged inside the valve body II respectively, a piston is arranged in the inner cavity of the valve body II, a piston is arranged in the valve body II in a clearance fit mode, a piston shaft of the piston extends into the inner cavity of the valve body I and penetrates through the plugging cover, a thread is arranged on the outer side of one end of the piston shaft penetrating through the plugging cover, a cushion is sleeved with a cushion through the thread, a pore plate is sleeved on the piston shaft between the plugging cover and the piston, an extending section is formed by the pore plate and one end, facing the plugging cover, of the pore plate, an extending section is sleeved with a small spring together, and the plugging cover and the pore plate are provided with a large spring sleeved on the outer side of the small spring, and a sealing ring II is arranged between the pore plate and the second annular stepped end faces of the piston end cover and the valve body II.

The working principle is as follows: through adjusting the position of the cushion on the piston shaft, the pretightening force of the small spring can be adjusted, namely the air pressure value of the breather valve during exhaust is adjusted. Through adjusting the position of blanking cover in valve body I, the pretightning force of big spring, atmospheric pressure value when adjusting the breather valve promptly and admitting air. When the air pressure in the box is greater than the air pressure in the box by a certain value, the air pressure in the box acts on the piston, the piston is separated from the sealing ring II by compressing the small spring, the air in the box is enabled to be exhausted out of the box, as shown in figure 2, when the air pressure in the box is greater than the air pressure in the box by a certain value, the air pressure in the box acts on the piston and the sealing ring II simultaneously, the sealing ring II is enabled to be separated from the valve body II by compressing the large spring, and the air in the box is enabled to enter the box, as shown in figure 3.

Compared with the prior art, the invention has the following beneficial effects:

the invention replaces the safety valve (automatic pressure release valve) commonly used for the sealed packing box, and can simultaneously realize the automatic air inlet function when the internal pressure of the sealed packing box is less than a certain value of external pressure and the automatic air outlet function when the internal pressure is more than the certain value of external pressure by utilizing the combined structure of double springs; the risk of damage to the packaging box and the contents caused by the conventional safety valve when the internal air pressure of the packaging box is lower than the external air pressure by a certain value is avoided.

The invention has the advantages of simple process, low processing cost, strong practicability, convenient operation and good military and economic benefits.

Drawings

Fig. 1 is a schematic structural view of a breather valve in a two-way closed state.

Fig. 2 is a schematic structural diagram of the exhaust state of the breather valve.

Fig. 3 is a schematic structural diagram of the air inlet state of the breather valve.

The figures are labeled as follows:

1-valve body I, 2-cushion, 3-small spring, 4-blanking cover, 5-big spring, 6-sealing ring I, 7-pore plate, 8-sealing ring II, 9-piston and 10-valve body II.

Detailed Description

The present invention is further illustrated by the following specific examples.

Examples

As shown in figure 1, the breather valve for the sealed package box comprises a valve body I1 and a valve body II 10 which are matched together in a rotating mode, the inner cavities of the valve body I1 and the valve body II 10 are communicated, a plugging cover 4 is matched on the inner side wall of the valve body I1 in a rotating mode, the plugging cover 4 is a perforated annular plate, two annular steps which are respectively a first annular step and a second annular step are arranged inside the valve body II 10, a piston 9 is arranged inside the inner cavity of the valve body II 10, the piston 9 is in clearance fit in the valve body II 10, a piston shaft of the piston 9 extends into the inner cavity of the valve body I1 and penetrates through the plugging cover 4, threads are arranged on the outer side of one end of the piston shaft penetrating through the plugging cover 4, a cushion 2 is sleeved through the threads, a pore plate 7 is sleeved on the piston shaft between the plugging cover 4 and the piston 9, an extension section is formed by the pore plate 7 and one end of the cushion 2 facing the plugging cover 4 along the piston shaft, a small spring 3 is sleeved on the extension sections of the cushion 2 and the pore plate 7, the plug cover 4 and the pore plate 7 are provided with a large spring 5 which is sleeved outside the small spring 3, and a sealing ring II 8 is arranged between the pore plate 7 and the second annular step end faces of the piston end cover and the valve body II 10.

Further, the one end embedding valve body I1 the inside of II 10 of valve body to pass through threaded connection with II 10 inside walls of valve body, be equipped with sealing washer I6 between I1 of valve body and II 10 of valve body, sealing washer I6 sets up between the terminal surface of I1 of valve body and the terminal surface of first cyclic annular ladder.

Furthermore, the diameter of the part of the valve body I1 extending out of the valve body II 10 is smaller than that of the part embedded in the valve body II 10.

Furthermore, an annular groove is formed in the end face, close to the piston end cover, of the pore plate 7, and the annular groove is used for placing a sealing ring II 8, so that the sealing performance is guaranteed.

One end of the small spring 3 acts on the cushion 2, the other end acts on the pore plate 7, and the pretightening force of the small spring 3, namely the air pressure value when the breather valve exhausts, can be adjusted by adjusting the position of the cushion 2 on the shaft of the piston 9.

The blanking cover 4 is connected in the valve body I1 through threads, one end of the large spring 5 acts on the blanking cover 4, the other end of the large spring acts on the pore plate 7, and the pretightening force of the large spring 5 can be adjusted by adjusting the position of the blanking cover 4 in the valve body I, namely, the air pressure value of the breathing valve during air intake is adjusted.

When the air pressure in the box is larger than the air pressure outside the box by a certain value, the air pressure in the box acts on the piston 9, the piston 9 is separated from the sealing ring II 8 through the pressure reducing spring 3, and the air in the box is discharged out of the box, as shown in figure 2, and figure 2 shows the exhaust state of the breather valve.

When the air pressure outside the box is larger than the air pressure inside the box by a certain value, the air pressure outside the box simultaneously acts on the piston 9 and the sealing ring II 8, the sealing ring II 8 is separated from the valve body II 10 by compressing the large spring 5, so that the air outside the box enters the box, as shown in figure 3, and figure 3 shows the air inlet state of the breather valve.