Bidirectional breather valve based on knife type sealing structure

Abstract

The utility model discloses a two-way breather valve based on a knife-shaped sealing structure, which is used for solving the technical problem that an air inlet valve and an exhaust valve need to be simultaneously mounted on a packaging box special for sealing in the prior art, is simple in structure processing, and belongs to the technical field of packaging boxes special for sealing. A nut is assembled at the bottom of the outer wall of a shell; the top of an inner cavity of the shell is connected with a first spring installation base through internal threads, a first sealing ring installation base is installed in the inner cavity of the shell and is in clearance fit with the inner cavity, a first compression spring is installed between a second spring installation base and the first sealing ring installation base, and a second compression spring is installed between the first spring installation base and the first sealing ring installation base. The first knife-shaped structure, the first sealing ring, the second air hole and the first air hole are matched with one another to form a pressure relief channel, and the first knife-shaped structure makes contact with the first sealing ring to close the pressure relief channel. The second sealing ring, the second knife-shaped structure, the third air hole, the blind hole and the first air hole are matched with one another to form an air inlet channel, and the second knife-shaped structure makes contact with the second sealing ring to close the air inlet channel.

Description

Technical Field

[0001] The utility model belongs to the technical field of special sealed packaging boxes, in particular to a two-way breathing valve based on a knife-shaped sealing structure. Background Art

[0002] Sealed packaging boxes must maintain a constant internal pressure within a certain range. However, fluctuations in external temperature or altitude can cause internal pressure fluctuations. If the pressure differential exceeds a certain value, the box and its contents can be easily damaged. To prevent this, most similar boxes currently incorporate separate inlet and exhaust valves to maintain a constant pressure within a certain range. These valves open to provide pressure-limiting protection when pressure exceeds a certain limit. Assembling these valves together within a sealed box can be cumbersome and inefficient. A small number of boxes also utilize bidirectional inlet and exhaust valves. However, existing bidirectional valves are complex in structure, requiring high machining precision for internal components (e.g., ensuring the coaxiality of key assembly parts), as well as high quality requirements for the sealing rings (e.g., requiring high quality seals that utilize the edges of the rings for sealing). This leads to significant manufacturing difficulties and high costs. Utility Model Content

[0003] The utility model aims to provide a two-way breathing valve based on a knife-type sealing structure, which is used to solve the technical problem that a special sealing packaging box in the prior art needs to be equipped with an intake valve and an exhaust valve at the same time, and the structure is simple to process.

[0004] The utility model is realized by adopting the following technical solutions:

[0005] A two-way breathing valve based on a knife-type sealing structure, hereinafter referred to as a two-way breathing valve, includes a shell with a through inner cavity and a bottom cover, a sealing ring mounting seat 1 and a sealing ring mounting seat 2, the outer wall of the shell is provided with an external thread 1, a circle of baffles is provided in the middle of the outer wall of the shell, a sealing groove 1 is provided at the bottom of the baffle, an O-ring is installed in the sealing groove 1, and a nut is assembled at the bottom of the outer wall of the shell.

[0006] A spring mounting seat is connected to the top of the inner cavity of the shell through an internal thread, and a vent hole is opened on the spring mounting seat. A through hole is set in the center of the bottom cover of the shell, and a knife-shaped structure is set along the through hole on the bottom cover. The tip of the knife-shaped structure extends into the inner cavity of the shell.

[0007] The sealing ring mounting seat is provided with a center hole, and a knife-shaped structure 2 is provided along the bottom of the sealing ring mounting seat. The tip of the knife-shaped structure 2 extends toward the bottom cover, and a sealing groove 2 is provided around the knife-shaped structure 2. A sealing ring 1 is installed in the sealing groove 2. The sealing ring mounting seat is provided with a plurality of air holes 2 that pass through the sealing ring 1 from top to bottom on the outside of the sealing ring 1.

[0008] After the sealing ring mounting seat 2 passes through the center hole of the sealing ring mounting seat 1, the top is connected to the spring mounting seat 2 through an external thread. The sealing ring mounting seat 2 is clearance-matched with the sealing ring mounting seat 1. The sealing ring mounting seat 2 is provided with a blind hole from the top surface to the bottom. The outer wall of the sealing ring mounting seat 2 extending out of the bottom side of the sealing ring mounting seat 1 is provided with an air vent 3 passing through the blind hole. The bottom of the sealing ring mounting seat 2 is provided with a sealing groove 3, and the sealing ring 2 is installed in the sealing groove 3.

[0009] The sealing ring mounting seat 1 is installed in the inner cavity of the housing and is in clearance with the inner cavity. A compression spring 1 is installed between the spring mounting seat 2 and the sealing ring mounting seat 1. A compression spring 2 is installed between the spring mounting seat 1 and the sealing ring mounting seat 1. The diameter of the compression spring 1 is smaller than that of the compression spring 2.

[0010] The knife-shaped structure 1, the sealing ring 1, the air vent 2 and the air vent 1 cooperate with each other to form a pressure relief channel, and the knife-shaped structure 1 contacts the sealing ring 1 to close the pressure relief channel.

[0011] The second sealing ring, the second knife-shaped structure, the third air vent, the blind hole and the first air vent cooperate with each other to form an air intake channel, and the second knife-shaped structure contacts the second sealing ring to close the air intake channel.

[0012] During use, first install the O-ring, sealing ring one and sealing ring two into sealing groove one, sealing groove two and sealing groove three respectively, then install sealing ring mounting seat two into sealing ring mounting seat one, then put the compression spring on sealing ring mounting seat two, and then screw the spring mounting seat two onto the top of the sealing ring mounting seat two, so that the compression spring one is installed between the spring mounting seat two and the sealing ring mounting seat one.

[0013] Then put the sealing ring mounting seat 1 and the sealing ring mounting seat 2 combination into the shell cavity, then install the compression spring 2, and then install the spring mounting seat 1 into the shell cavity so that the compression spring 2 is installed between the spring mounting seat 1 and the sealing ring mounting seat 1.

[0014] Finally, the assembled assembly is passed into the interior of the sealed special packaging box until the baffle is stuck on the outside of the sealed special packaging box, and then the nut is screwed onto the external thread of the shell from the inside of the sealed special packaging box. At this time, the installation of the utility model can be completed.

[0015] Further preferably, a groove 1 for accommodating the compression spring 2 is provided at the bottom of the spring mounting seat 1, thereby limiting the compression spring 2.

[0016] Further preferably, a valve cap is installed on the top of the shell through an external thread 1, and the valve cap is provided with a vent hole 4, which can prevent dust from entering the inner cavity of the shell and also enhance the sealing performance of the two-way breathing valve to a certain extent.

[0017] Further preferably, a groove 2 for accommodating the first compression spring and the second compression spring is provided on the top of the first sealing ring mounting seat, thereby limiting the first compression spring and the second compression spring.

[0018] Further preferably, a filter is installed between the valve cap and the top of the shell. When the gas flows, the filter can filter impurities in the air to prevent the impurities from entering the two-way breathing valve and causing negative effects on the two-way breathing valve.

[0019] Further preferably, the shape of the groove 2 is an annular groove, the inner ring diameter of the annular groove is consistent with the diameter of the center hole, and the setting of the annular groove can constrain the sealing ring mounting seat 2 to prevent the sealing ring mounting seat 2 from tilting, while realizing the limitation of compression spring 1 and compression spring 2.

[0020] Further preferably, the spring mounting seat 2 is provided with a groove 3 for accommodating the compression spring 1, thereby limiting the compression spring 1.

[0021] Further preferably, the sealing ring mounting seat 1 and the sealing ring mounting seat 2 are made of non-metallic materials.

[0022] Further preferably, the air vent 1 is coaxially arranged with the inner cavity of the shell, which facilitates the installation of the spring mounting seat 1 and ensures uniform force during operation, thereby increasing the service life of the spring mounting seat 1.

[0023] The utility model discloses a two-way breathing valve based on a knife-shaped sealing structure, which has the beneficial effect of integrating the two valves to realize the automatic air intake function when the internal pressure of the sealed special packaging box is less than a certain value of the external pressure, and the automatic exhaust function when the internal pressure is greater than a certain value of the external pressure. The knife-shaped sealing structure is utilized to solve the problem of high coaxiality requirements when the sealing parts are matched, and the processing difficulty and processing cost are reduced, the cost is greatly saved, the use is economical, and the structure is simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present invention, and together with the description, serve to explain the principles of the present invention.

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0026] Figure 1 A schematic diagram of the cross-sectional structure of the present invention is shown.

[0027] Figure 2 Gas flow diagram of the utility model when positive pressure is opened.

[0028] Figure 3 Gas flow diagram when negative pressure is turned on in the utility model.

[0029] In the figure: 1-housing, 11-baffle, 12-O-ring, 13-nut, 14-knife-shaped structure one, 2-sealing ring mounting seat one, 21-knife-shaped structure two, 22-sealing ring one, 23-vent two, 3-sealing ring mounting seat two, 31-blind hole, 32-sealing ring two, 33-vent three, 4-spring mounting seat one, 41-vent one, 5-spring mounting seat two, 6-compression spring one, 7-compression spring two, 8-valve bonnet, 81-vent four, 9-filter. DETAILED DESCRIPTION

[0030] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the scheme of the present invention will be further described below. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein can be combined with each other.

[0031] In the description, it should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance. It should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood broadly. For example, they can refer to fixed connections, removable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms based on specific circumstances.

[0032] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present invention, rather than all of the embodiments.

[0033] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0034] A two-way breathing valve based on a knife-type sealing structure includes a shell 1 with a through inner cavity and a bottom cover, a sealing ring mounting seat 1 2 and a sealing ring mounting seat 2 3. The outer wall of the shell 1 is provided with an external thread 1, a circle of baffles 11 is provided in the middle of the outer wall of the shell 1, a sealing groove 1 is provided at the bottom of the baffle 11, an O-ring 12 is installed in the sealing groove 1, and a nut 13 is assembled at the bottom of the outer wall of the shell 1.

[0035] The top of the inner cavity of the shell 1 is connected to a spring mounting seat 4 through an internal thread. The spring mounting seat 4 is provided with a vent hole 41, which is coaxially arranged with the inner cavity of the shell 1. A through hole 1 is provided at the center of the bottom cover of the shell 1. A knife-shaped structure 14 is provided along the through hole 1, and the tip of the knife-shaped structure 14 extends into the inner cavity of the shell 1.

[0036] The sealing ring mounting seat 1 is provided with a center hole, and a knife-shaped structure 21 is provided along the bottom of the sealing ring mounting seat 1. The tip of the knife-shaped structure 21 extends toward the bottom cover. A sealing groove 2 is provided around the knife-shaped structure 21, and a sealing ring 1 22 is installed in the sealing groove 2. The sealing ring mounting seat 1 is provided with a plurality of vertically penetrating air holes 23 on the outside of the sealing ring 1 22.

[0037] After the sealing ring mounting seat 2 3 passes through the center hole of the sealing ring mounting seat 1 2, the top is connected to the spring mounting seat 2 5 through an external thread. The sealing ring mounting seat 2 3 and the sealing ring mounting seat 1 2 are clearance-matched. The sealing ring mounting seat 2 3 is provided with a blind hole 31 from the top surface to the bottom. The outer wall of the sealing ring mounting seat 2 3 extending out of the bottom side of the sealing ring mounting seat 1 2 is provided with an air vent 3 3 passing through the blind hole 31. The bottom of the sealing ring mounting seat 2 3 is provided with a sealing groove 3, and a sealing ring 2 32 is installed in the sealing groove 3.

[0038] The sealing ring mounting seat 2 is installed into the inner cavity of the shell 1 and is clearance-matched with the inner cavity. A compression spring 6 is installed between the spring mounting seat 2 5 and the sealing ring mounting seat 2. A compression spring 2 7 is installed between the spring mounting seat 4 and the sealing ring mounting seat 2. The diameter of the compression spring 6 is smaller than that of the compression spring 2 7.

[0039] A groove 1 for accommodating a compression spring 2 7 is provided at the bottom of the spring mounting seat 1 4 .

[0040] A valve cap 8 is installed on the top of the shell 1 through an external thread 1. The valve cap 8 is provided with a vent hole 24 81. A filter screen 9 is installed between the valve cap 8 and the top of the shell 1.

[0041] A groove 2 for accommodating a compression spring 1 6 and a compression spring 2 7 is provided at the top of the sealing ring mounting seat 1 2 .

[0042] The second groove is in the shape of a circular ring groove, and the inner ring diameter of the circular ring groove is consistent with the diameter of the center hole.

[0043] The spring mounting seat 2 5 is provided with a groove 3 for accommodating the compression spring 1 6 .

[0044] The sealing ring mounting seat 1 2 and the sealing ring mounting seat 2 3 are made of non-metallic materials.

[0045] In this embodiment, the knife-shaped structure is a ring-shaped structure with a spiked end. The knife-shaped structure 14, the sealing ring 22, the air vent 23, the air vent 41, the filter 9 and the air vent 4 81 cooperate with each other to form a pressure relief channel. The knife-shaped structure 14 contacts the sealing ring 22 to close the pressure relief channel.

[0046] The second sealing ring 32, the second knife-shaped structure 21, the third air vent 33, the blind hole 31 and the first air vent 41, the filter 9 and the fourth air vent 81 cooperate with each other to form an air intake channel, and the second knife-shaped structure 21 contacts the second sealing ring 32 to close the air intake channel.

[0047] Here’s how it works:

[0048] When the air pressure inside the sealed packaging box is greater than the air pressure outside the sealed packaging box by a certain value, the air pressure inside the sealed packaging box acts on the sealing ring mounting seat 2 3, and the sealing ring mounting seat 2 3 moves upward. At the same time, the sealing ring mounting seat 1 2 is lifted up. At this time, the compression spring 1 6 is compressed, so that the knife-shaped structure 14 of the shell 1 and the sealing ring mounting seat 1 2 are separated, that is, the knife-shaped structure 14 of the shell 1 and the sealing ring 1 22 are separated, prompting the gas inside the sealed packaging box to be discharged outside the sealed packaging box through the pressure relief channel.

[0049] When the air pressure inside the sealed packaging box is lower than a certain value of the air pressure outside the sealed packaging box, the air pressure outside the sealed packaging box acts on the sealing ring mounting seat 2 3, and the sealing ring mounting seat 2 3 moves downward, so that the knife-shaped structure 2 21 of the sealing ring mounting seat 1 2 and the sealing ring 2 32 are separated. At the same time, the compression spring 1 6 is compressed, and the compression spring 1 6 makes the sealing ring mounting seat 1 2 pressed tightly against the knife-shaped structure 14 of the shell 1, prompting the gas outside the sealed packaging box to enter the sealed packaging box through the air inlet channel.

[0050] The air intake and exhaust functions are integrated into a two-way breathing valve, which optimizes the overall structure of the existing pressure limiting valve and makes installation more convenient. The knife-shaped structure solves the problem of high coaxiality requirements when the seals of the existing two-way air intake and exhaust valves are matched, reduces the processing difficulty and cost, and greatly saves costs.

[0051] The above description is only a specific embodiment of the present invention, which enables those skilled in the art to understand or implement the present invention. Although detailed descriptions have been made with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents; and such modifications or replacements do not deviate from the essence of the corresponding technical solutions within the scope of the technical solutions of the embodiments, and they should all be covered by the scope of protection of the claims.

Claims

1. A two-way breathing valve based on a knife-type sealing structure, characterized by: It comprises a shell (1) having a through inner cavity and a bottom cover, a sealing ring mounting seat 1 (2) and a sealing ring mounting seat 2 (3), the outer wall of the shell (1) being provided with an external thread 1, a baffle (11) being provided in the middle of the outer wall of the shell (1), a sealing groove 1 being provided at the bottom of the baffle (11), an O-type sealing ring (12) being installed in the sealing groove 1, and a nut (13) being assembled at the bottom of the outer wall of the shell (1); The top of the inner cavity of the shell (1) is connected to a spring mounting seat (4) via an internal thread, and the spring mounting seat (4) is provided with an air vent (41). The center of the bottom cover of the shell (1) is provided with a through hole (1), and the bottom cover is provided with a knife-shaped structure (14) along the through hole (1), and the tip of the knife-shaped structure (14) extends toward the inner cavity of the shell (1); The sealing ring mounting seat 1 (2) is provided with a center hole, the bottom of the sealing ring mounting seat 1 (2) is provided with a knife-shaped structure 2 (21) along the center hole, the tip of the knife-shaped structure 2 (21) extends toward the bottom cover, the periphery of the knife-shaped structure 2 (21) is provided with a sealing groove 2, the sealing ring 1 (22) is installed in the sealing groove 2, and the sealing ring mounting seat 1 (2) is provided with a plurality of vertically penetrating air holes 2 (23) on the outside of the sealing ring 1 (22); The second sealing ring mounting seat (3) passes through the center hole of the first sealing ring mounting seat (2), and is connected to the second spring mounting seat (5) at the top through an external thread. The second sealing ring mounting seat (3) is clearance-matched with the first sealing ring mounting seat (2). The second sealing ring mounting seat (3) is provided with a blind hole (31) extending from the top surface to the bottom. The outer wall of the portion of the second sealing ring mounting seat (3) extending from the bottom side of the first sealing ring mounting seat (2) is provided with a third air vent (33) passing through the blind hole (31). The bottom of the second sealing ring mounting seat (3) is provided with a third sealing groove, and the second sealing ring (32) is installed in the third sealing groove. The sealing ring mounting seat 1 (2) is installed in the inner cavity of the housing (1) and is in clearance with the inner cavity. A compression spring 1 (6) is installed between the spring mounting seat 2 (5) and the sealing ring mounting seat 1 (2). A compression spring 2 (7) is installed between the spring mounting seat 1 (4) and the sealing ring mounting seat 1 (2). The diameter of the compression spring 1 (6) is smaller than the diameter of the compression spring 2 (7). The knife-shaped structure 1 (14), the sealing ring 1 (22), the air vent 2 (23) and the air vent 1 (41) cooperate with each other to form a pressure relief channel, and the knife-shaped structure 1 (14) contacts the sealing ring 1 (22) to close the pressure relief channel; The second sealing ring (32), the second knife-shaped structure (21), the third air vent (33), the blind hole (31) and the first air vent (41) cooperate with each other to form an air inlet passage, and the second knife-shaped structure (21) contacts the second sealing ring (32) to close the air inlet passage.

2. A two-way breathing valve based on a knife-type sealing structure according to claim 1, characterized in that: The bottom of the spring mounting seat 1 (4) is provided with a groove 1 for accommodating the compression spring 2 (7).

3. The two-way breathing valve based on the knife-type sealing structure according to claim 1 is characterized in that: A valve cap (8) is mounted on the top of the housing (1) via an external thread 1, and the valve cap (8) is provided with a vent hole 4 (81).

4. The two-way breathing valve based on the knife-type sealing structure according to claim 2 is characterized in that: The top of the sealing ring mounting seat 1 (2) is provided with a groove 2 for accommodating the compression spring 1 (6) and the compression spring 2 (7).

5. The two-way breathing valve based on the knife-type sealing structure according to claim 3 is characterized in that: A filter screen (9) is installed between the valve cap (8) and the top of the housing (1).

6. The two-way breathing valve based on the knife-type sealing structure according to claim 4 is characterized in that: The second groove is in the shape of an annular groove, and the inner ring diameter of the annular groove is consistent with the diameter of the center hole.

7. A two-way breathing valve based on a knife-type sealing structure according to any one of claims 1 to 6, characterized in that: The spring mounting seat 2 (5) is provided with a groove 3 for accommodating the compression spring 1 (6).

8. A two-way breathing valve based on a knife-type sealing structure according to any one of claims 1 to 6, characterized in that: The sealing ring mounting seat 1 (2) and the sealing ring mounting seat 2 (3) are made of non-metallic materials.

9. A two-way breathing valve based on a knife-type sealing structure according to any one of claims 1 to 6, characterized in that: The air vent hole 1 (41) is coaxially arranged with the inner cavity of the shell (1).

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