Air film sealing structure of low-temperature breather valve

Abstract

The utility model belongs to the technical field of breather valves, and discloses an air film sealing structure of a low-temperature breather valve, which comprises a valve disc and a valve seat in a sleeve shape with two open ends, and further comprises a screw rod, the screw rod and the valve disc are coaxially placed and fixed at the lower end of the valve disc, and a vent hole penetrating through the two ends is formed in the screw rod. A plurality of notch grooves which are uniformly distributed are formed in the peripheral wall of the end, close to the valve disc, of the screw rod, and the notch grooves are in through connection with the vent holes; the sealing film is in a circular ring shape and located below the valve disc, the inner ring edge of the sealing film is connected with a connecting assembly, the connecting assembly is in threaded connection to the screw rod, the inner ring edge of the sealing film is located below the notch groove, and the diameter of the outer side of the sealing film is larger than that of the inner side of the valve seat; the problems that in the prior art, leakage is caused by unevenness of a sealing film of a breather valve, and the sealing film is prone to freezing in the low-temperature environment are effectively solved, the service life and reliability of the breather valve are guaranteed, and the safety and stability of equipment operation are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of breathing valves, and in particular relates to an air membrane sealing structure of a low-temperature breathing valve. Background Art

[0002] The breathing valve is a key safety device widely used in storage tanks and pipeline systems. Its main function is to automatically open and close the valve when the pressure changes, ensure the pressure balance inside and outside the system, and prevent the container from being damaged due to excessive or low pressure. Common breathing valves usually adopt a valve disc plus diaphragm design, and the sealing film is pressed against the valve seat so that the sealing film is tightly attached to the valve disc to achieve sealing. However, this design in the prior art has some significant defects; first, if the fitting surface between the valve disc and the sealing film is not flat enough, it will lead to a loose seal, thereby increasing the risk of leakage of the breathing valve; secondly, in a low temperature environment, the fitting interface between the sealing film and the valve disc and the valve seat is very easy to freeze. The formation of ice will affect the flexibility of the sealing film and the movement of the valve disc, resulting in the breathing valve being unable to open or close normally; therefore, there are problems in the prior art such as leakage of the breathing valve due to the uneven fitting surface between the valve disc and the sealing film, and easy freezing of the sealing film in a low temperature environment. Utility Model Content

[0003] In view of the deficiencies in the prior art, the purpose of the present disclosure is to provide a device that solves the problems in the prior art of breathing valve leakage due to uneven fitting surfaces between the valve disc and the sealing film and easy freezing of the sealing film in a low temperature environment.

[0004] The purpose of this disclosure can be achieved through the following technical solutions:

[0005] A low-temperature breathing valve air film sealing structure includes a valve disc and a valve seat, wherein the valve seat is in the shape of a sleeve with openings at both ends, and further includes:

[0006] The screw is coaxially arranged with the valve disc and fixed at the lower end of the valve disc. The screw is provided with vent holes penetrating both ends. The peripheral wall of the screw near the end of the valve disc is provided with a plurality of evenly distributed notches, which are connected with the vent holes.

[0007] The sealing membrane is in the shape of a ring and is located below the valve disc. The inner ring edge of the sealing membrane is connected with a connecting component, which is threadedly connected to the screw. The inner ring edge of the sealing membrane is located below the notch groove. The outer diameter of the sealing membrane is larger than the inner diameter of the valve seat, and the upper end of the valve seat is against the lower end of the sealing membrane.

[0008] A clamping ring, which is coaxially placed with the valve disc, an outer ring edge of the sealing membrane is located between the upper end surface of the clamping ring and the lower end surface of the valve disc, and the clamping ring and the valve disc are detachably connected;

[0009] The principle and effect of the above technical solution are as follows:

[0010] When there is pressure in the breathing valve, the gas in the breathing valve passes through the vent holes and notch grooves on the screw and finally enters the cavity between the sealing membrane and the valve disc. Since the outer diameter of the sealing membrane is larger than the inner diameter of the valve seat, after the gas enters the cavity between the sealing membrane and the valve disc, the sealing membrane will be blown up to form a smooth surface, thereby improving the sealing performance between the valve disc and the sealing membrane.

[0011] When the temperature is low, if the sealing membrane freezes, when the valve disc is opened, the sealing membrane will be deformed due to the loss of pressure in the cavity between the sealing membrane and the valve disc, and the ice crystals attached to the sealing membrane will automatically fall off, effectively solving the leakage problem caused by the uneven sealing membrane of the breathing valve in the prior art and the problem of easy freezing in low temperature environment, ensuring the service life and reliability of the breathing valve and improving the safety and stability of equipment operation.

[0012] The connection assembly includes a screw sleeve which is threadedly sleeved on a screw rod, a peripheral wall of the screw sleeve is provided with spirally distributed thread teeth, the lower end of the screw sleeve is located below the sealing film, a convex ring is provided on the peripheral wall of the lower end of the screw sleeve, a nut is sleeved on the peripheral wall of the upper end of the screw sleeve, and the nut is threadedly connected to the screw sleeve through the thread teeth;

[0013] The upper end of the convex ring of the screw sleeve is fixedly connected with a first gasket placed coaxially, and the lower end of the nut is fixedly sleeved with a second gasket placed coaxially;

[0014] The outer edge of the lower end of the valve disc is provided with a placement groove for coaxial placement, and the clamping ring is located below the placement groove;

[0015] The outer diameter of the clamping ring is larger than the outer diameter of the valve disc;

[0016] A plurality of ear plates are fixed to the peripheral wall of the valve disc, and the plurality of ear plates are evenly distributed in a ring shape around the central axis of the valve disc;

[0017] The ear plates are each provided with a first screw hole coaxially arranged with the screw rod, and the clamping ring is provided with a plurality of second screw holes evenly distributed in an annular shape, and the number of the second screw holes is equal to that of the first screw holes and corresponds one to one;

[0018] The first screw holes of the ear plates are sleeved with threaded bolts, and the lower ends of the bolts extend into the second screw holes and are threadedly connected therewith.

[0019] The nouns, conjunctions or adjectives involved in the above technical solution are explained as follows:

[0020] Connection: refers to the process of connecting two separate profiles or parts into a complex part or component using fasteners such as screws, bolts and rivets.

[0021] Threaded connection: refers to the fastening of two or more parts together through the interaction of threads.

[0022] Beneficial effects of the present disclosure:

[0023] 1. When there is pressure in the breathing valve, the gas in the breathing valve passes through the vent holes and the notch grooves into the space between the sealing film and the valve disc, and the sealing film will be blown up to form a smooth surface, thereby improving the sealing between the valve disc and the sealing film; and in low temperature conditions, if the sealing film freezes, when the valve disc is opened, the sealing film will be deformed due to the loss of pressure in the cavity between the sealing film and the valve disc, and the ice crystals attached to the sealing film will automatically fall off, effectively solving the leakage caused by the uneven sealing film of the breathing valve in the prior art, and the problem that the sealing film is easy to freeze in a low temperature environment, ensuring the service life and reliability of the breathing valve, and improving the safety and stability of the equipment operation;

[0024] 2. In the present application, the screw, the sleeve, the nut, the first gasket, the second gasket, the placement groove, the ear plate, the clamping ring and the bolt are arranged in coordination, so as to achieve a stable connection of the sealing membrane and facilitate the maintenance and replacement of the sealing membrane. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0026] Figure 1 is a schematic diagram of the overall structure of an embodiment of the present disclosure;

[0027] Figure 2 is a schematic diagram of the overall structure of the embodiment of the present disclosure from different viewing angles;

[0028] Figure 3 is a partial structural schematic diagram of an embodiment of the present disclosure;

[0029] Figure 4 is a schematic diagram of the structure of the screw rod of the embodiment of the present disclosure;

[0030] Figure 5 It is a partial structural schematic diagram of the screw sleeve of an embodiment of the present invention. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0032] Combined with this Figures 1 to 5To describe an embodiment of the low-temperature breathing valve air film sealing structure. Specifically, the low-temperature breathing valve air film sealing structure is constructed as a split structure, which has four components, namely, a valve disc 100, a screw 300, a sealing film 400 and a clamping ring 500. When there is pressure in the breathing valve, the gas in the breathing valve passes through the vent hole 301 and the notch groove 302 on the screw 300, and finally enters the cavity between the sealing film 400 and the valve disc 100. Since the outer diameter of the sealing film 400 is larger than the inner diameter of the valve seat 200, after the gas enters the cavity between the sealing film 400 and the valve disc 100, the sealing film 400 will be blown up to form a smooth surface, thereby improving the sealing between the valve disc 100 and the sealing film 400.

[0033] Under low temperature conditions, if the sealing film 400 is frozen, when the valve disc 100 is opened, the sealing film 400 will be deformed due to the loss of pressure in the cavity between the sealing film 400 and the valve disc 100, and the ice crystals attached to the sealing film 400 will automatically fall off, and the sealing performance will not be affected after the valve disc 100 returns to its seat.

[0034] Please refer to Figures 1 to 5 A low-temperature breathing valve air film sealing structure includes a valve disc 100 and a valve seat 200, wherein the valve seat 200 is in the shape of a sleeve with openings at both ends, and further includes:

[0035] The screw 300 is coaxially arranged with the valve disc 100 and fixed to the lower end of the valve disc 100. The screw 300 is provided with vent holes 301 penetrating both ends. The peripheral wall of the screw 300 near the end of the valve disc 100 is provided with a plurality of evenly distributed notch grooves 302. The notch grooves 302 are in continuous connection with the vent holes 301.

[0036] The sealing film 400 is annular and is located below the valve disc 100. The inner ring edge of the sealing film 400 is connected with a connecting component, which is threadedly connected to the screw 300. The inner ring edge of the sealing film 400 is located below the notch groove 302. The outer diameter of the sealing film 400 is larger than the inner diameter of the valve seat 200. The upper end of the valve seat 200 abuts against the lower end of the sealing film 400.

[0037] A clamping ring 500, the clamping ring 500 and the valve disc 100 are placed coaxially, the outer ring edge of the sealing film 400 is located between the upper end surface of the clamping ring 500 and the lower end surface of the valve disc 100, and the clamping ring 500 and the valve disc 100 are detachably connected;

[0038] The screw 300 is usually made of high-strength material such as stainless steel or alloy steel to ensure its durability under high load and corrosive environment; the surface may be subjected to heat treatment and anti-corrosion treatment, such as galvanizing or oxidation treatment, to enhance its wear resistance and corrosion resistance.

[0039] The sealing film 400 is usually made of a high-performance elastic material, such as rubber or fluororubber, and has excellent wear resistance, corrosion resistance and high temperature resistance. The sealing film 400 is usually made by injection molding or calendering process and is surface treated to improve wear resistance.

[0040] The clamping ring 500 is usually a circular ring made of metal material, which is used to fix the outer ring edge of the sealing membrane 400 on the valve disc 100. It has a design that is easy to install and disassemble, and can usually be connected to the valve disc 100 by bolt connection or clamping device; the clamping ring 500 needs to have high processing accuracy and appropriate surface treatment to ensure matching with the valve disc 100 and provide stable sealing performance; in addition, stress distribution and thermal expansion coefficient should be considered in the design to avoid problems caused by stress concentration and inconsistent thermal expansion.

[0041] During operation, the valve disc 100 is brought close to the valve seat 200, so that the screw rod 300 extends into the valve seat 200, and the upper end of the valve seat 200 abuts against the lower end of the sealing film 400, so that the part of the sealing film 400 abutted by the peripheral wall of the upper end of the valve seat 200 is attached to the valve disc 100;

[0042] When there is pressure in the breathing valve, the gas in the breathing valve passes through the vent hole 301 and the notch groove 302 on the screw 300, and finally enters the cavity between the sealing film 400 and the valve disc 100. Since the outer diameter of the sealing film 400 is larger than the inner diameter of the valve seat 200, after the gas enters the cavity between the sealing film 400 and the valve disc 100, the sealing film 400 will be blown up to form a smooth surface, thereby improving the sealing between the valve disc 100 and the sealing film 400.

[0043] When the temperature is low, if the sealing film 400 is frozen, when the valve disc 100 is opened, the sealing film 400 will be deformed due to the loss of pressure in the cavity between the sealing film 400 and the valve disc 100, and the ice crystals attached to the sealing film 400 will automatically fall off, effectively solving the leakage caused by the unevenness of the sealing film 400 of the breathing valve in the prior art and the problem that the sealing film 400 is easy to freeze in a low temperature environment, ensuring the service life and reliability of the breathing valve and improving the safety and stability of the equipment operation.

[0044] In order to facilitate the connection of the inner edge of the sealing membrane 400, the connecting component includes a screw sleeve 601 threadedly sleeved on the screw rod 300, the peripheral wall of the screw sleeve 601 is provided with spirally distributed thread teeth, the lower end of the screw sleeve 601 is located below the sealing membrane 400, the peripheral wall of the lower end of the screw sleeve 601 is provided with a convex ring, and the peripheral wall of the upper end of the screw sleeve 601 is sleeved with a nut 602, and the nut 602 is threadedly connected to the screw sleeve 601 through the thread teeth; when in use, the inner ring edge of the sealing membrane 400 is located between the nut 602 and the convex ring at the lower end of the screw sleeve 601, and the nut 602 is screwed to move it toward the lower end of the screw sleeve 601, and the nut 602 and the convex ring on the screw sleeve 601 are approached to each other, so that the nut 602 and the convex ring on the screw sleeve 601 squeeze and fix the sealing membrane 400, thereby completing the fixed connection of the inner ring edge of the sealing membrane 400.

[0045] Preferably, the screw sleeve 601 can be rotated to control the adjustment screw sleeve 601 to be close to or away from the valve disc 100, so as to adjust the gap between the middle of the sealing membrane 400 and the valve disc 100, so as to form a cavity between the sealing membrane 400 and the valve disc 100.

[0046] In order to improve the stability of the connection to the inner ring edge of the sealing plate, the upper end of the convex ring of the screw sleeve 601 is fixedly connected with a first gasket 603 placed coaxially, and the lower end of the nut 602 is fixedly sleeved with a second gasket 604 placed coaxially; the stability of the connection is improved by the coordinated arrangement of the first gasket 603 and the second gasket 604.

[0047] A coaxial placement groove 101 is provided at the outer edge of the lower end of the valve disc 100 , and the clamping ring 500 is located below the placement groove 101 ; the outer ring edge of the sealing membrane 400 extends into the placement groove 101 .

[0048] The outer diameter of the clamping ring 500 is larger than the outer diameter of the valve disc 100, so as to fully clamp the outer ring edge of the sealing membrane 400.

[0049] A plurality of ear plates 700 are fixed to the peripheral wall of the valve disc 100, and the plurality of ear plates 700 are evenly distributed in a ring shape around the central axis of the valve disc 100;

[0050] The ear plates 700 are provided with first screw holes coaxially arranged with the screw rod 300, and the clamping ring 500 is provided with a plurality of second screw holes evenly distributed in an annular shape, and the number of the second screw holes is equal to that of the first screw holes and corresponds one to one;

[0051] The first screw holes of the ear plates 700 are sleeved with threaded bolts 701, and the lower ends of the bolts 701 extend into the second screw holes and are threadedly connected thereto;

[0052] When the clamping ring 500 is pressed against the lower end face of the outer ring edge of the sealing membrane 400, the outer ring edge of the sealing membrane 400 is fixed between the clamping ring 500 and the valve disc 100, and then the bolt 701 is inserted from the upper end of the first screw hole of the ear plate 700, and the bolt 701 is rotated to make the bolt 701 pass through the first screw hole and the second screw hole in turn. Through the connection of the bolt 701, a stable connection between the valve disc 100 and the clamping ring 500 is achieved, and the maintenance and replacement of the sealing membrane 400 is also facilitated.

[0053] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0054] The above shows and describes the basic principles, main features and advantages of the present disclosure. Those skilled in the art should understand that the present disclosure is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present disclosure. Without departing from the spirit and scope of the present disclosure, the present disclosure may have various changes and improvements, and these changes and improvements fall within the scope of the present disclosure to be protected.

Claims

1. A low-temperature breathing valve air membrane sealing structure, comprising a valve disc (100) and a valve seat (200), wherein the valve seat (200) is in the shape of a sleeve with openings at both ends, and is characterized in that: Also includes: A screw (300), the screw (300) and the valve disc (100) are coaxially arranged and fixed to the lower end of the valve disc (100), the screw (300) is provided with vent holes (301) running through both ends, a peripheral wall of the screw (300) close to the end of the valve disc (100) is provided with a plurality of evenly distributed notch grooves (302), and the notch grooves (302) are connected to the vent holes (301); The sealing film (400) is annular in shape and is located below the valve disc (100). The inner ring edge of the sealing film (400) is connected to a connecting component, which is threadedly connected to the screw (300). The inner ring edge of the sealing film (400) is located below the notch groove (302). The outer diameter of the sealing film (400) is greater than the inner diameter of the valve seat (200). The upper end of the valve seat (200) abuts against the lower end of the sealing film (400). The clamping ring (500) is coaxially arranged with the valve disc (100), the outer ring edge of the sealing film (400) is located between the upper end surface of the clamping ring (500) and the lower end surface of the valve disc (100), and the clamping ring (500) and the valve disc (100) are detachably connected.

2. The low-temperature breathing valve air membrane sealing structure according to claim 1 is characterized in that: The connection assembly comprises a screw sleeve (601) threadedly sleeved on a screw rod (300), a peripheral wall of the screw sleeve (601) being provided with spirally distributed thread teeth, a lower end of the screw sleeve (601) being located below a sealing film (400), a peripheral wall of the lower end of the screw sleeve (601) being provided with a convex ring, a peripheral wall of the upper end of the screw sleeve (601) being sleeved with a nut (602), and the nut (602) being threadedly connected to the screw sleeve (601) through the thread teeth.

3. The low-temperature breathing valve air membrane sealing structure according to claim 2 is characterized in that: The upper end of the convex ring of the screw sleeve (601) is fixedly connected with a first gasket (603) placed coaxially, and the lower end of the nut (602) is fixedly sleeved with a second gasket (604) placed coaxially.

4. The low-temperature breathing valve air membrane sealing structure according to claim 3 is characterized in that: A coaxial placement groove (101) is provided on the outer edge of the lower end of the valve disc (100), and the clamping ring (500) is located below the placement groove (101).

5. The low-temperature breathing valve air membrane sealing structure according to claim 4 is characterized in that: The outer diameter of the clamping ring (500) is greater than the outer diameter of the valve disc (100).

6. The low-temperature breathing valve air membrane sealing structure according to claim 5 is characterized in that: A plurality of ear plates (700) are fixed to the peripheral wall of the valve disc (100), and the plurality of ear plates (700) are evenly distributed in a ring shape around the central axis of the valve disc (100).

7. The low-temperature breathing valve air membrane sealing structure according to claim 6 is characterized in that: The ear plates (700) are each provided with a first screw hole coaxially arranged with the screw rod (300), and the clamping ring (500) is provided with a plurality of second screw holes evenly distributed in an annular shape, wherein the number of the second screw holes is equal to that of the first screw holes and the number of the second screw holes corresponds to the first screw holes.

8. The low-temperature breathing valve air membrane sealing structure according to claim 7 is characterized in that: The first screw holes of the ear plates (700) are sleeved with threaded bolts (701), and the lower ends of the bolts (701) extend into the second screw holes and are threadedly connected thereto.

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