Safety valve for inflatable product

Abstract

A safety valve for an inflatable product comprises a valve body, a working cavity and an exhaust cavity in the valve body, the working cavity is communicated with the exhaust cavity through a valve port, an exhaust one-way valve element assembly is arranged at the position of the valve port, and a plurality of air holes which are axially formed along the circumference at intervals are formed in the peripheral wall of the working cavity. A first filter screen for shielding an opening of the exhaust cavity is arranged at the top of the exhaust cavity; the valve is characterized by further comprising a filter cover used for filtering impurities, the filter cover comprises a frame made of plastic and a second filter screen with meshes, the frame is installed on the peripheral wall of the valve body, and the second filter screen is embedded in the peripheral wall and the bottom wall of the frame, so that the air holes are blocked by the second filter screen. The safety valve has the advantages that impurities are prevented from entering the working cavity through the filter cover, and the second filter screen of the filter cover not only can block the impurities, but also can guarantee enough ventilation capacity; and the frame of the filter cover enables the periphery of the second filter screen to be protected by plastic, so that the second filter screen is prevented from being damaged when the safety valve is collided.

Description

Technical Field

[0001] The utility model relates to a safety valve, in particular to a safety valve for an inflatable product. Background Art

[0002] There are such safety hazards in relatively large inflatable devices such as air beds and inflatable boats, that is, if the internal pressure of the inflatable product is too high, there may be a hidden danger of causing the hull to burst. To solve the foregoing technical problems, some people consider setting a safety valve on the inflatable boat. A conventional spring-loaded safety valve includes a valve body threadedly connected to a valve seat. The valve body has a working cavity communicating with the internal environment of the inflatable product and an exhaust cavity communicating with the outside. The working cavity and the exhaust cavity are interconnected through a valve port. A valve stem supported by a spring is provided in the working cavity. A sealing washer is provided at the upper end of the valve stem after passing through the valve port. Under the action of the spring, the valve stem has a downward movement tendency, and thus the sealing washer has a tendency to remain in contact with the valve port to block the working cavity and the exhaust cavity. When the pressure in the working cavity is higher than the supporting force of the spring on the valve stem, that is, when the working pressure is higher than the calibration pressure set by the safety valve, air pressure or oil pressure will act on the valve stem, causing the valve stem to move upward, and then driving the sealing washer at the upper end of the valve stem to move upward. The excessive pressure will be discharged from the exhaust cavity to the outside through the gap between the sealing washer and the valve port. The pressure in the working cavity decreases. When the working pressure is lower than the supporting force of the spring on the valve stem, the spring will drive the valve stem to move downward again, causing the sealing washer to close the valve port again and blocking the communication between the working cavity and the exhaust cavity.

[0003] In order to prevent impurities from entering the working cavity and the exhaust cavity of the safety valve and affecting the normal use of the inflatable product, the existing safety valve for an inflatable product is as shown in the patent No. CN201520674874.5 (the authorized publication number is CN204961938U). A wrapper with mesh holes is fixedly wrapped around the outer periphery of the working cavity of the safety valve. The air holes on the working cavity are blocked by the wrapper, and a filter screen blocking the opening of the exhaust cavity is provided in the exhaust cavity of the safety valve. Both the filter screen and the wrapper with mesh holes can block impurities from entering the safety valve and allow gas to flow through, thus ensuring the use effect of the safety valve of the inflatable product.

[0004] Although the above-mentioned safety valve blocks impurities from entering through the filter screen and the wrapper, the wrapper is a nylon net made of flexible material. During the actual use of the safety valve, the safety valve is prone to being bumped. For example, for a safety valve specially designed for inflatable products used on the beach, the sand or reefs on the beach are likely to cut the nylon net, causing the wrapper to be damaged, so that impurities cannot be blocked from entering the safety valve, affecting the use effect of the safety valve; and the safety valve used on the beach is likely to encounter water. After the nylon net absorbs water, it is easy to stick to the air holes of the safety valve, making the air permeability of the safety valve worse, thus affecting the use effect of the safety valve. In addition, the nylon net of the above-mentioned safety valve is pressed and fixed on the outer periphery of the working chamber by a plastic ring. The operation of installing the nylon net is rather troublesome and requires the user to apply force to install the plastic ring on the outer periphery of the working chamber. Therefore, further improvement is needed for the safety valve for inflatable products. Summary of the Invention

[0005] The technical problem to be solved by the present utility model is to provide a safety valve for inflatable products that can block impurities from entering and has a more stable structure in view of the above-mentioned prior art status.

[0006] The technical solution adopted by the present utility model to solve the above technical problem is as follows: The safety valve for inflatable products includes a valve body. A working chamber communicating with the internal environment of the inflatable product and an exhaust chamber communicating with the outside are provided in the valve body. The working chamber and the exhaust chamber are interconnected through a valve port. An exhaust check valve core assembly that tends to block the valve port under normal conditions is provided at the position of the valve port. A plurality of axially arranged and circumferentially spaced air holes are provided on the peripheral wall of the working chamber. A first filter screen for blocking the opening of the exhaust chamber is provided at the top of the exhaust chamber. It is characterized in that: it further includes a filter cover for filtering impurities. The filter cover includes a frame made of plastic and a second filter screen with mesh holes. The frame is installed on the outer peripheral wall of the valve body, and the second filter screen is embedded on the peripheral wall and the bottom wall of the frame, so that the air holes are blocked by the second filter screen.

[0007] In order to enhance the wear resistance of the filter screen, preferably, the first filter screen and the second filter screen are metal filter screens or plastic filter screens. Metal filter screens and plastic filter screens have a certain hardness, which not only enhances the wear resistance of the filter screen, but also enables the filter screen not to affect the air permeability due to water absorption when encountering water, thus ensuring the ventilation effect of the first filter screen and the second filter screen.

[0008] In order to enable the second filter screen to be embedded on the peripheral wall and the bottom wall of the frame, preferably, the frame includes a first annular frame that can be installed on the outer peripheral wall of the valve body and a second annular frame located below the first annular frame. Part of the second filter screen is embedded in the second annular frame, and a plurality of vertically arranged frames are provided at intervals between the first annular frame and the second annular frame. The remaining part of the second filter screen is embedded between two adjacent vertically arranged frames. The first annular frame is connected to the second annular frame through the vertically arranged frames. The user installs the first annular frame on the outer peripheral wall of the valve body, thereby sleeving the entire filter cover on the lower end of the valve body, that is, covering the ventilation holes. Moreover, the second filter screen is strengthened through the first annular frame, the second annular frame, and the vertically arranged frames, enabling the second filter screen to be formed by encapsulation and preventing the second filter screen from being damaged.

[0009] In order to enable the first annular frame to be installed on the outer peripheral wall of the valve body, preferably, an annular rib is provided on the outer peripheral wall of the valve body, and the annular rib is located above the ventilation holes. An annular groove and at least two ribs are provided on the inner wall of the first annular frame. An opening corresponding to the rib is provided on the annular rib, and the rib is installed on the annular rib through the corresponding opening, enabling the annular rib to be snapped into the annular groove. Align each rib with its corresponding opening, and the user pushes the filter cover upward, enabling the rib to be installed on the annular rib through the corresponding opening and enabling the annular rib to be snapped into the annular groove, thereby completing the installation of the first annular frame and the valve body.

[0010] In order to facilitate the assembly of the working chamber and the exhaust chamber, preferably, the valve body includes an outer shell and an inner shell. The inner shell is threadedly connected in the concave cavity of the outer shell. The valve port and the exhaust chamber are provided on the inner shell, and the concave cavity of the outer shell forms the working chamber. The working chamber and the exhaust chamber are assembled in the valve body through the cooperation of the outer shell and the inner shell.

[0011] In order to optimize the structure of the inner shell, preferably, three connecting ribs are provided on the inner wall of the valve port at intervals, and the valve rod of the exhaust check valve core assembly movably passes between the three connecting ribs. The existing connecting ribs generally adopt a cross shape, resulting in a more troublesome process for machining the inner shell. In this application, three connecting ribs are provided at intervals, thereby simplifying the structure of the inner shell and making the machining process of the inner shell more convenient.

[0012] As a solution for the exhaust check valve core assembly, preferably, the exhaust check valve core assembly further includes a gasket, a spring and a spring seat. The upper end of the valve stem is connected with a gasket for blocking the valve port. The gasket is located in the exhaust cavity. The lower end of the valve stem is fixed with a spring seat. The spring is sleeved on the valve stem and is located below the exhaust cavity. The spring acts on the spring seat to keep the gasket on the valve stem in a downward movement trend to block the valve port. This exhaust check valve core assembly has a simple structure and is convenient to assemble. When the pressure in the working cavity is higher than the supporting force of the spring on the valve stem, that is, when the working pressure is higher than the calibration pressure set by the safety valve, the air pressure will act on the valve stem, causing the valve stem to move upward, and then driving the gasket at the upper end of the valve stem to move upward. The excessive pressure will be discharged to the outside through the gap between the gasket and the valve port, through the exhaust cavity and the first filter screen, and the pressure in the working cavity will decrease. When the pressure in the working cavity is lower than the supporting force of the spring on the valve stem, the spring will drive the valve stem to move downward again, so that the gasket will seal the valve port again, blocking the communication between the working cavity and the exhaust cavity.

[0013] Compared with the prior art, the advantages of the present utility model are as follows: The safety valve prevents impurities from entering the exhaust cavity through the exhaust cavity opening by setting the first filter screen, ensuring the working effect of the exhaust cavity of the safety valve; at the same time, the safety valve also prevents impurities from entering the working cavity through the air permeable holes by setting the filter cover. The second filter screen of the filter cover can not only block impurities, but also ensure the air ventilation volume between the safety valve and the internal environment of the inflatable product; and the filter cover has a frame, so that the second filter screen is protected by plastic on all sides, that is, the second filter screen is formed by encapsulating rubber, avoiding the damage of the second filter screen when the safety valve is knocked, thereby enhancing the strength of the filter cover. In addition, if the safety valve encounters water, the frame can support the second filter screen embedded therein, thereby avoiding the deterioration of the air permeability of the second filter screen due to water absorption and ensuring sufficient air ventilation volume. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic structural diagram of an embodiment of the present utility model;

[0015] Figure 2 is Figure 1 a cross-sectional view of;

[0016] Figure 3 is a schematic structural diagram of the outer shell in an embodiment of the present utility model;

[0017] Figure 4 is a schematic structural diagram of the frame in an embodiment of the present utility model;

[0018] Figure 5 is a schematic structural diagram of the inner shell in an embodiment of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The present utility model will be further described in detail below in conjunction with the embodiments of the drawings.

[0020] As Figures 1 to 5 shown, this is the best embodiment of the present utility model.

[0021] As Figure 1 and Figure 2 shown, the safety valve for the inflatable product of this embodiment includes a valve body 1 and a filter cover 3 for filtering impurities. The valve body 1 includes an outer shell 13 and an inner shell 14. The inner shell 14 is threadedly connected in the concave cavity of the outer shell 13. There is a working cavity A communicating with the internal environment of the inflatable product and an exhaust cavity B communicating with the outside in the valve body 1. The working cavity A and the exhaust cavity B are interconnected through a valve port C. The valve port C and the exhaust cavity B are provided on the inner shell 14, and the concave cavity of the outer shell 13 forms the working cavity A. At the position of the valve port C, there is an exhaust check valve core assembly that tends to block the valve port C under normal conditions. The peripheral wall of the working cavity A is provided with a plurality of axially arranged and circumferentially spaced vent holes 11. The top of the exhaust cavity B is provided with a first filter screen 2 for covering the opening of the exhaust cavity B. And the filter cover 3 of this embodiment includes a frame 31 made of plastic and a second filter screen 32 with mesh holes. The frame 31 is installed on the outer peripheral wall of the valve body 1, and the second filter screen 32 is embedded in the peripheral wall and the bottom wall of the frame 31, so that the vent holes 11 are blocked by the second filter screen 32. Among them, the first filter screen 2 and the second filter screen 32 are metal filter screens or plastic filter screens. The first filter screen 2 and the second filter screen 32 can block impurities from entering the valve body 1, and the first filter screen 2 and the second filter screen 32 can also ensure gas flow. In addition, the second filter screen 32 is placed in the mold as an insert and then molded together with the frame 31.

[0022] As Figure 4 shown, the frame 31 of this embodiment includes a first annular frame 311 that can be installed on the outer peripheral wall of the valve body 1 and a second annular frame 312 located below the first annular frame 311. Part of the second filter screen 32 is embedded in the second annular frame 312. There are a plurality of vertically arranged and spaced vertical frames 313 between the first annular frame 311 and the second annular frame 312, and the remaining second filter screen 32 is embedded between two adjacent vertical frames 313.

[0023] As Figures 2 to 4 shown, the outer peripheral wall of the valve body 1 of this embodiment is provided with an annular rib 12. The annular rib 12 is located above the vent holes 11. The inner wall of the first annular frame 311 is provided with an annular groove 311a and two ribs 311b. The annular rib 12 is provided with an opening 121 corresponding to the rib 311b. The rib 311b is installed on the annular rib 12 through the corresponding opening 121, so that the annular rib 12 can be snapped into the annular groove 311a.

[0024] As Figure 2 and Figure 5As shown in the figure, three connecting ribs 4 are provided on the inner wall of the valve port C of this embodiment at intervals, and the valve stem 5 of the exhaust check valve core assembly is movably inserted between the three connecting ribs 4. In addition, the exhaust check valve core assembly of this embodiment further includes a gasket 6, a spring 7 and a spring seat 8. The upper end of the valve stem 5 is connected with a gasket 6 for blocking the valve port C. The gasket 6 is located in the exhaust cavity B. The lower end of the valve stem 5 is fixed with a spring seat 8. The spring 7 is sleeved on the valve stem 5 and is located below the exhaust cavity B. The spring 7 acts on the spring seat 8 to keep the gasket 6 on the valve stem 5 in a downward movement trend to block the valve port C.

[0025] The working process of this embodiment is as follows: First, install the filter cover 3 on the valve body 1, that is, align each rib 311b with its corresponding opening 121. The user pushes the filter cover 3 upward so that the rib 311b is installed on the annular rib 12 through the corresponding opening 121, and the annular rib 12 can be snapped into the annular groove 311a, thereby completing the installation of the filter cover 3 and the valve body 1, and the second filter screen 32 blocks the air holes 11; then, squeeze the outer periphery of the working cavity A of the valve body 1 into the inflatable product from the inflation port, so that the working cavity A is exposed in the inflatable product, and then screw the inner shell 14 tightly into the working cavity A, so as to firmly press the edge of the installation hole of the inflatable product, and then make the safety valve work accordingly. That is, when the pressure in the working cavity A is higher than the supporting force of the spring 7 on the valve stem 5, that is, when the working pressure is higher than the calibration pressure set by the safety valve, the air pressure will act on the valve stem 5, causing the valve stem 5 to move upward, and then driving the gasket 6 at the upper end of the valve stem 5 to move upward. The excessive pressure will be discharged to the outside through the gap between the gasket 6 and the valve port C through the exhaust cavity B and the first filter screen 2, and the pressure in the working cavity A will decrease. When the pressure in the working cavity A is lower than the supporting force of the spring 7 on the valve stem 5, the spring 7 will drive the valve stem 5 to move downward again, so that the gasket 6 closes the valve port C again, blocking the communication between the working cavity A and the exhaust cavity B.

Claims

1. A safety valve for an inflatable product, comprising a valve body (1). The valve body (1) has a working chamber (A) communicating with the internal environment of the inflatable product and an exhaust chamber (B) communicating with the outside. The working chamber (A) and the exhaust chamber (B) are interconnected through a valve port (C). At the position of the valve port (C), there is an exhaust check valve core assembly that tends to block the valve port (C) under normal conditions. The peripheral wall of the working chamber (A) is provided with a plurality of axially arranged and circumferentially spaced air permeable holes (11). The top of the exhaust chamber (B) is provided with a first filter screen (2) for blocking the opening of the exhaust chamber (B); It is characterized in that: It further includes a filter cover (3) for filtering impurities. The filter cover (3) includes a frame (31) made of plastic and a second filter screen (32) with meshes. The frame (31) is installed on the outer peripheral wall of the valve body (1), and the second filter screen (32) is embedded in the peripheral wall and bottom wall of the frame (31), so that the air vents (11) are blocked by the second filter screen (32).

2. The safety valve for inflatable products according to claim 1, characterized in that: The first filter screen (2) and the second filter screen (32) are metal filter screens or plastic filter screens.

3. The safety valve for inflatable products according to claim 1, characterized in that: The frame (31) includes a first annular frame (311) that can be installed on the outer peripheral wall of the valve body (1) and a second annular frame (312) located below the first annular frame (311). Part of the second filter screen (32) is embedded in the second annular frame (312), and a plurality of vertically arranged frames (313) are arranged at intervals between the first annular frame (311) and the second annular frame (312), and the remaining second filter screen (32) is embedded between two adjacent vertically arranged frames (313).

4. The safety valve for inflatable products according to claim 3, characterized in that: An annular rib (12) is provided on the outer peripheral wall of the valve body (1), and the annular rib (12) is located above the air vents (11). An annular groove (311a) and at least two ribs (311b) are provided on the inner wall of the first annular frame (311). An opening (121) corresponding to the rib (311b) is provided on the annular rib (12), and the rib (311b) is installed on the annular rib (12) through the corresponding opening (121), so that the annular rib (12) can be clamped into the annular groove (311a).

5. The safety valve for inflatable products according to any one of claims 1 to 4, characterized in that: The valve body (1) includes an outer shell (13) and an inner shell (14). The inner shell (14) is threadedly connected in the concave cavity of the outer shell (13). The valve port (C) and the exhaust cavity (B) are arranged on the inner shell (14), and the concave cavity of the outer shell (13) forms a working cavity (A).

6. The safety valve for inflatable products according to claim 5, wherein: Three connecting ribs (4) are arranged at intervals on the inner wall of the valve port (C), and the valve stem (5) of the exhaust check valve core assembly movably passes between the three connecting ribs (4).

7. The safety valve for inflatable products according to claim 6, characterized in that: The exhaust check valve core assembly further includes a sealing gasket (6), a spring (7) and a spring seat (8). The upper end of the valve stem (5) is connected with a sealing gasket (6) for blocking the valve port (C). The sealing gasket (6) is located in the exhaust cavity (B). The lower end of the valve stem (5) is fixed with a spring seat (8). The spring (7) is sleeved on the valve stem (5) and is located below the exhaust cavity (B). The spring (7) acts on the spring seat (8) to keep the sealing gasket (6) on the valve stem (5) in a downward movement trend to block the valve port (C).

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