Dual-purpose exhalation valve capable of being switched between air exhalation mode and air supply mode

Abstract

The utility model discloses an exhalation valve capable of being switched between an air exhalation mode and an air supply mode. A clamping ring is connected to the inner wall of an exhalation valve seat and matched with an annular clamping block at the bottom of an exhalation valve body in a clamped mode. The inner wall of the exhalation valve body is connected with an exhalation valve knob seat; the inner wall of the knob seat is in threaded connection with a rotor; the knob is clamped with a columnar clamping groove formed in the upper surface of the rotor through a columnar clamping block; a hole is formed in the middle of the rotor, the mandrel penetrates through the hole, the lower section of the mandrel penetrates through the rotary knob base to be matched with the middle expiration valve and the front expiration valve, the top end of the mandrel is fixedly connected with the rotor, the mandrel moves up and down to drive the front expiration valve to move to open or close the front expiration hole, and the air pressure of air expiration is resisted by matching with the elastic force of the spring. The problems that in the prior art, an exhalation valve is normally opened under wind pressure due to insufficient stress in an air exhalation mode, and poisoning risks exist are solved, and the air exhalation valve has the advantages that manual switching can be conducted according to different using modes of air exhalation and air supply, so that valve resistance is increased in time, and poisoning in the air exhalation mode is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of gas masks, in particular to an exhalation valve capable of switching between air exhalation mode and air supply mode. Background Art

[0002] At present, the exhalation valve of the gas mask is mostly an umbrella-shaped thin sheet structure, which has a simple structure and a single function, and has a small exhalation resistance. Therefore, it can only be used for self-inhalation breathing through filtering elements, or increasing the air supply of the air supply device to ensure the breathing comfort of the personnel. In many complex environments at present, for example, when the concentration of toxic agents in the external environment exceeds the specified set threshold or the oxygen concentration is low, it is necessary to switch to the air breathing mode, and provide fresh air to the human body through the gas storage cylinder, and the gas output by the cylinder will cause the pressure in the mask to rise. At this time, the simple exhalation valve structure is only suitable for the wind pressure of human self-inhalation due to the small structural strength of the rubber sheet, and it is difficult to withstand the large wind pressure of the gas supply of the cylinder, so that the exhalation valve is always in an open state of being blown open, and it is easy for the toxic gas to be inhaled by the human body during inhalation, causing poisoning; in the prior art, it is often necessary to circumvent this problem by redesigning the structure of the exhalation valve, which is extremely costly and has poor applicability; or the thickness and strength of the rubber sheet of the exhalation valve are increased to resist the wind pressure, but the reinforced rubber sheet can only be used in the air breathing mode and cannot be used in the spontaneous breathing mode;

[0003] Therefore, a gas mask exhalation valve that can switch according to different usage modes of air exhalation and air supply is needed to solve the above problems. The existing exhalation valve is improved so that when it is necessary to switch to air exhalation mode without affecting the original function, the resistance of the exhalation valve can be increased to ensure the normal operation of the air respirator. Summary of the invention

[0004] The technical problem to be solved by the utility model is to provide an exhalation valve that can switch between air exhalation mode and air supply mode, so as to solve the problem that the exhalation valve in the prior art has insufficient stress in the air exhalation mode, which will cause the valve to be normally open under wind pressure and there is a risk of poisoning. The utility model has the characteristic of being able to be manually switched according to different usage modes of air exhalation and air supply, thereby increasing the valve resistance in time to avoid poisoning in the air exhalation mode.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0006] The exhalation valve for switching between air exhalation mode and air supply mode comprises an exhalation valve seat, the exhalation valve seat is provided with an inner hole for plugging and matching with the exhalation valve body, the outer surface of the exhalation valve seat is connected with a pressure ring for clamping and matching with the gas mask; the inner wall of the exhalation valve seat is connected with a clamping ring, the upper surface of the clamping ring is provided with a first annular groove for clamping and matching with the annular clamping block at the bottom of the exhalation valve body; the bottom of the exhalation valve seat is provided with a front exhalation hole;

[0007] The inner wall of the exhalation valve body is connected to the exhalation valve knob seat, and an internal thread groove is provided in the middle of the knob seat, and the inner wall of the internal thread groove is threadedly connected to the rotor; a second annular groove is also provided on the surface of the knob seat outside the internal thread groove to cooperate with the knob, and the knob includes a vertical annular clamping block, which is clamped and rotatably engaged with the second annular groove, and a top plate is connected to the top of the annular clamping block, and the lower surface of the top plate is clamped with the columnar clamping groove provided on the upper surface of the rotor through a columnar clamping block; a hole is opened in the middle of the rotor, and a core shaft passes through the opening, and the lower section of the core shaft passes through the knob seat to cooperate with the valve mechanism, and the top end of the core shaft is fixedly connected to the rotor.

[0008] Furthermore, the length between the columnar clamping block and the columnar clamping slot provided on the upper surface of the rotor is not less than the stroke required for the vertical movement of the core shaft, ensuring that the columnar clamping block will not be separated from the columnar clamping slot within the full vertical movement of the core shaft.

[0009] Preferably, a first sealing ring is provided between the first annular groove and the annular block at the bottom of the exhalation valve body.

[0010] Preferably, a rotation-stop bar is connected to the outer surface of the exhalation valve body and cooperates with a protruding U-shaped limiting groove provided on the inner wall of the exhalation valve seat. The rotation-stop bar is inserted into the U-shaped structure of the limiting groove to limit the rotation of the exhalation valve body.

[0011] Furthermore, when the exhalation valve body is installed into the exhalation valve seat, the anti-rotation strip is aligned and engaged with the limit groove, so that the exhalation valve body can be prevented from rotating when the knob is rotated; the exhalation valve body and the knob seat are an integral connection structure.

[0012] Preferably, a second sealing ring is provided between the second annular groove and the annular block at the bottom of the knob for sealing.

[0013] Preferably, the valve mechanism includes a middle exhalation valve plate located below the knob seat, the middle exhalation valve plate includes a columnar structure with a through hole opened inside, and a circular shielding plate is connected to the outer surface of the columnar structure; the through hole is interlaced with the core shaft.

[0014] Preferably, a middle part of the clamping ring is provided with a middle exhalation hole which cooperates with the shielding piece of the middle exhalation valve piece, the inner wall of the middle exhalation hole is connected with a guide block through a connecting rod, a through hole is provided in the middle part of the guide block for the core shaft to pass through, and a groove is provided in the middle part of the guide block which is plugged into and cooperated with the bottom of the columnar structure of the middle exhalation valve piece.

[0015] Preferably, the top of the columnar structure of the middle exhalation valve sheet is snap-fitted with the groove at the bottom of the knob seat, and a third sealing ring is arranged in the groove for sealing.

[0016] Furthermore, the upper and lower ends of the middle exhalation valve sheet are respectively limited by the knob seat and the guide block, and will not move up and down with the core shaft; the connection between the middle exhalation valve sheet and the core shaft is also a movable connection with a gap, and will not be moved up and down or rotated by the core shaft.

[0017] Preferably, the valve mechanism includes a front exhalation valve plate, which is movably sleeved on the bottom end of the outer surface of the core shaft, and the shielding plate of the front exhalation valve plate cooperates with the front exhalation hole at the bottom of the exhalation valve seat; a gasket is sleeved above the shielding plate of the front exhalation valve plate, the gasket is connected to the bottom end of the spring, and the top end of the spring is connected to the bottom end of the guide block.

[0018] Preferably, a retaining ring is threadedly connected to the bottom end of the core shaft.

[0019] Furthermore, the core shaft is fixedly connected to the rotor and the retaining ring only at two ends, and the connection between the middle section and the knob seat, the middle exhalation valve sheet, the guide block and the front exhalation valve sheet are all movably connected.

[0020] Furthermore, the shielding plates of the middle exhalation valve plate and the front exhalation valve plate both adopt a flexible structure of natural rubber.

[0021] The method for using the above-mentioned exhalation valve for switching between air exhalation mode and air supply mode comprises the following steps:

[0022] S1, when using the canister filter method for spontaneous breathing or the blower for air supply breathing, manually rotate the knob counterclockwise, the knob rotates in the second annular groove of the knob seat, the columnar block drives the rotor to rise on the inner wall thread of the knob seat, the rotor drives the core shaft to rise, and the core shaft drives the retaining ring at the bottom to rise, at this time the guide block and the middle exhalation valve plate remain stationary, the front exhalation valve is retracted from the surface of the front exhalation hole at the bottom of the exhalation valve seat to the inside, and the front exhalation hole is opened;

[0023] S2, when breathing in the air exhalation mode, manually rotate the knob clockwise, the knob rotates in the second annular groove of the knob seat, and the rotor is driven to descend on the inner wall thread of the knob seat through the columnar block, the rotor drives the core shaft to descend, and the core shaft drives the retaining ring at the bottom to descend. At this time, the guide block and the middle exhalation valve plate remain stationary, and the front exhalation valve extends from the inside of the front exhalation hole at the bottom of the exhalation valve seat to the surface of the front exhalation hole, and is pressed against the upper surface of the front exhalation hole by the elastic force of the stretched spring, closing the front exhalation hole, and the elastic force of the spring is used to resist the wind force in the air supply mode, thereby increasing the resistance of the breathing valve and preventing the breathing valve from being normally open under the wind pressure in the air supply mode.

[0024] The beneficial effects of the utility model are as follows:

[0025] 1. The utility model can switch between air exhalation and air supply modes by manually controlling the position of the knob without affecting the original functions. It has a simple structure and is easy to control.

[0026] 2. The retractable front exhalation valve structure designed by the utility model, by reasonably setting the spring, uses the elastic force of the spring to resist the air supply pressure in the air exhalation mode, thereby preventing the valve from being continuously blown open and kept open under the air supply pressure, thereby avoiding the problem of poisoning risk;

[0027] 3. The exhalation valve of the utility model can be installed on the mask through the exhalation valve seat and sealed by a sealing ring, which is a purely mechanical mechanism; all major components are assembled by threading, plug-in or clip-on, which is easy to disassemble and replace. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0029] Figure 1 It is a schematic diagram of the cross-sectional structure of the utility model;

[0030] Figure 2 This is a schematic diagram of the bottom structure of the utility model;

[0031] Figure 3 It is a schematic diagram of the top structure of the utility model;

[0032] Figure 4 It is a partial structural schematic diagram of the rotor and the knob in the utility model being engaged with each other through a columnar clamping block and a columnar clamping groove;

[0033] Figure 5 It is a schematic diagram of the structure of the exhalation valve and the gas mask of the utility model;

[0034] Figure 6 It is a structural schematic diagram of the exhalation valve sheet in the utility model;

[0035] In the figure: exhalation valve seat 1, retaining ring 2, knob 3, knob seat 4, internal thread groove 41, second annular groove 42, columnar clamping block 43, rotor 5, first sealing ring 6, third sealing ring 7, second sealing ring 8, retaining ring 9, gasket 10, core shaft 11, pressure ring 12, front exhalation valve plate 13, middle exhalation valve plate 14, spring 15, exhalation valve body 16, guide block 17, front exhalation hole 18, first annular groove 19, stop strip 20, limit groove 21, columnar structure 22, middle exhalation hole 23, connecting rod 24, mask body 25. DETAILED DESCRIPTION

[0036] Embodiment 1:

[0037] like Figure 1-4As shown, the exhalation valve for switching between air exhalation mode and air supply mode comprises an exhalation valve seat 1, the exhalation valve seat 1 is provided with an inner hole for plugging and matching with the exhalation valve body 16, the outer surface of the exhalation valve seat 1 is connected with a pressure ring 12 for snap-fitting with the gas mask; the inner wall of the exhalation valve seat 1 is connected with a clamping ring 2, the upper surface of the clamping ring 2 is provided with a first annular groove 19 for snap-fitting with the annular clamping block at the bottom of the exhalation valve body 16; the bottom of the exhalation valve seat 1 is provided with a front exhalation hole 18;

[0038] The inner wall of the exhalation valve body 16 is connected to the exhalation valve knob seat 4, and an internal thread groove 41 is provided in the middle of the knob seat 4, and the inner wall of the internal thread groove 41 is threadedly connected to the rotor 5; the surface of the knob seat 4 outside the internal thread groove 41 is also provided with a second annular groove 42 to cooperate with the knob 3, and the knob 3 includes a vertical annular clamping block, which is clamped and rotatably matched with the second annular groove 42, and a top plate is connected to the top of the annular clamping block, and the lower surface of the top plate is clamped with the columnar clamping groove provided on the upper surface of the rotor 5 through a columnar clamping block 43; a hole is opened in the middle of the rotor 5, and the core shaft 11 passes through the opening, and the lower section of the core shaft 11 passes through the knob seat 4 to cooperate with the valve mechanism, and the top end of the core shaft 11 is fixedly connected to the rotor 5.

[0039] Furthermore, the length between the columnar block 43 and the columnar slot on the upper surface of the rotor 5 is not less than the stroke required for the spindle 11 to move up and down, ensuring that the columnar block 43 will not fall out of the columnar slot within the full stroke of the spindle 11 moving up and down.

[0040] Preferably, a first sealing ring 6 is provided between the first annular groove 19 and the annular block at the bottom of the exhalation valve body 16 .

[0041] Preferably, a stop bar 20 is connected to the outer surface of the exhalation valve body 16 and cooperates with a protruding U-shaped limiting groove 21 opened on the inner wall of the exhalation valve seat 1. The stop bar 20 is inserted into the U-shaped structure of the limiting groove 21 to limit the rotation of the exhalation valve body 16.

[0042] Furthermore, when the exhalation valve body 16 is installed into the exhalation valve seat 1, the anti-rotation strip 20 is aligned and engaged with the limit groove 21, which can prevent the exhalation valve body 16 from rotating when the knob 3 is rotated; the exhalation valve body 16 and the knob seat 4 are an integral connection structure.

[0043] Preferably, a second sealing ring 8 is provided between the second annular groove 42 and the annular block at the bottom of the knob 3 for sealing.

[0044] Preferably, the valve mechanism includes a middle exhalation valve plate 14 located below the knob seat 4, and the middle exhalation valve plate 14 includes a columnar structure 22 with a through hole opened inside, and a circular shielding plate is connected to the outer surface of the columnar structure 22; the through hole is inserted and matched with the core shaft 11.

[0045] Preferably, a middle exhalation hole 23 is opened in the middle of the clamping ring 2 to cooperate with the shielding piece of the middle exhalation valve piece 14, the inner wall of the middle exhalation hole 23 is connected to the guide block 17 through a connecting rod 24, a through hole is opened in the middle of the guide block 17 for the core shaft 11 to pass through, and a groove is opened in the middle of the guide block 17 to be plugged into the bottom of the columnar structure 22 of the middle exhalation valve piece 14.

[0046] Preferably, the top of the columnar structure 22 of the middle exhalation valve sheet 14 is snap-fitted with the groove at the bottom of the knob seat 4, and a third sealing ring 7 is provided in the groove for sealing.

[0047] Furthermore, the upper and lower ends of the middle exhalation valve plate 14 are respectively limited and clamped by the knob seat 4 and the guide block 17, and will not move up and down with the core shaft 11; the connection between the middle exhalation valve plate 14 and the core shaft 11 is also a movable connection with a gap, and will not be moved up and down or rotated by the core shaft 11.

[0048] Preferably, the valve mechanism includes a front exhalation valve plate 13, which is movably sleeved on the bottom end of the outer surface of the core shaft 11, and the shielding plate of the front exhalation valve plate 13 cooperates with the front exhalation hole 18 at the bottom of the exhalation valve seat 1; a gasket 10 is sleeved above the shielding plate of the front exhalation valve plate 13, and the gasket 10 is connected to the bottom end of the spring 15, and the top end of the spring 15 is connected to the bottom end of the guide block 17.

[0049] Preferably, a retaining ring 9 is threadedly connected to the bottom end of the core shaft 11 .

[0050] Furthermore, the core shaft 11 is fixedly connected to the rotor 5 and the retaining ring 9 only at two ends, and the middle section is movably connected to the knob seat 4, the middle exhalation valve plate 14, the guide block 17 and the front exhalation valve plate 13.

[0051] Furthermore, the shielding plates of the middle exhalation valve plate 14 and the front exhalation valve plate 13 are both made of a flexible structure of natural rubber.

[0052] Furthermore, the structure of the front exhalation flap is the same as that of the middle exhalation flap.

[0053] Embodiment 2:

[0054] The method for using the above-mentioned exhalation valve capable of switching between air exhalation mode and air supply mode comprises the following steps:

[0055] S1, when using the canister filtration method for spontaneous breathing or the blower for air supply breathing, manually rotate the knob 3 counterclockwise, the knob 3 rotates in the second annular groove 42 of the knob seat 4, and the columnar clamping block 43 drives the rotor 5 to rise on the inner wall thread of the knob seat 4, the rotor 5 drives the core shaft 11 to rise, and the core shaft 11 drives the retaining ring 9 at the bottom to rise, at this time, the guide block 17 and the middle exhalation valve plate 14 remain stationary, and the front exhalation valve is retracted from the surface of the front exhalation hole 18 at the bottom of the exhalation valve seat 1 to the inside, and the front exhalation hole 18 is opened;

[0056] S2, when breathing in the air exhalation mode, manually rotate the knob 3 clockwise, the knob 3 rotates in the second annular groove 42 of the knob seat 4, and drives the rotor 5 to descend on the inner wall thread of the knob seat 4 through the columnar block 43, the rotor 5 drives the core shaft 11 to descend, and the core shaft 11 drives the retaining ring 9 at the bottom to descend. At this time, the guide block 17 and the middle exhalation valve plate 14 remain stationary, and the front exhalation valve extends from the inside of the front exhalation hole 18 at the bottom of the exhalation valve seat 1 to the surface of the front exhalation hole 18, and is pressed against the upper surface of the front exhalation hole 18 by the elastic force of the stretched spring 15, so that the front exhalation hole 18 is closed, and the wind force of the air supply mode is resisted by the elastic force of the spring 15, thereby increasing the resistance of the breathing valve and preventing the breathing valve from being normally open under the wind pressure in the air supply mode.

[0057] The above embodiments are only preferred technical solutions of the present invention and should not be regarded as limitations of the present invention. The protection scope of the present invention shall be the technical solutions recorded in the claims, including equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. An exhalation valve capable of switching between air exhalation mode and air supply mode, comprising an exhalation valve seat (1), the exhalation valve seat (1) having an inner hole for plugging and cooperating with an exhalation valve body (16), and a pressure ring (12) connected to the outer surface of the exhalation valve seat (1) for snap-fitting with a gas mask; characterized in that: The inner wall of the exhalation valve seat (1) is connected to a clamping ring (2), and the upper surface of the clamping ring (2) is provided with a first annular groove (19) which is clamped and matched with an annular clamping block at the bottom of the exhalation valve body (16); a front exhalation hole (18) is provided at the bottom of the exhalation valve seat (1); the inner wall of the exhalation valve body (16) is connected to the exhalation valve knob seat (4), and an internal thread groove (41) is provided in the middle of the knob seat (4), and a rotor (5) is threadedly connected to the inner wall of the internal thread groove (41); a second annular groove (42) is also provided on the surface of the knob seat (4) outside the internal thread groove (41) to match with the knob (3), and the knob (3) comprises a vertical annular clamping block, and the annular clamping block is provided. The block is engaged with the second annular groove (42) and rotates in cooperation, the top of the annular block is connected to a top plate, and the lower surface of the top plate is engaged with a columnar groove provided on the upper surface of the rotor (5) through a columnar block (43); a hole is opened in the middle of the rotor (5), a core shaft (11) passes through the hole, the lower section of the core shaft (11) passes through the knob seat (4) and cooperates with the valve mechanism, and the top end of the core shaft (11) is fixedly connected to the rotor (5); a first sealing ring (6) is provided between the first annular groove (19) and the annular block at the bottom of the exhalation valve body (16); and a second sealing ring (8) is provided between the second annular groove (42) and the annular block at the bottom of the knob (3).

2. The exhalation valve capable of switching between air exhalation mode and air supply mode according to claim 1, characterized in that: A rotation-stop bar (20) is connected to the outer surface of the exhalation valve body (16) and cooperates with a protruding U-shaped limiting groove (21) provided on the inner wall of the exhalation valve seat (1); the rotation-stop bar (20) is inserted into the U-shaped structure of the limiting groove (21) to limit the rotation of the exhalation valve body (16).

3. The exhalation valve capable of switching between air exhalation mode and air supply mode according to claim 1, characterized in that: The valve mechanism comprises a middle exhalation valve plate (14) located below the knob seat (4), the middle exhalation valve plate (14) comprising a columnar structure (22) with a through hole formed therein, a circular shielding plate being connected to the outer surface of the columnar structure (22); the through hole is interlaced with the core shaft (11).

4. The exhalation valve capable of switching between air exhalation mode and air supply mode according to claim 3 is characterized in that: A middle exhalation hole (23) is provided in the middle of the clamping ring (2) and cooperates with the shielding piece of the middle exhalation valve sheet (14); the inner wall of the middle exhalation hole (23) is connected to a guide block (17) via a connecting rod (24); a through hole is provided in the middle of the guide block (17) for the core shaft (11) to pass through; a groove is provided in the middle of the guide block (17) and is plug-fitted with the bottom of the columnar structure (22) of the middle exhalation valve sheet (14).

5. The exhalation valve capable of switching between air exhalation mode and air supply mode according to claim 4, characterized in that: The top of the columnar structure (22) of the middle exhalation valve sheet (14) is snap-fitted with the groove at the bottom of the knob seat (4), and a third sealing ring (7) is arranged in the groove for sealing.

6. The exhalation valve capable of switching between air exhalation mode and air supply mode according to claim 1, characterized in that: The valve mechanism comprises a front exhalation valve plate (13), the front exhalation valve plate (13) is movably sleeved on the bottom end of the outer surface of the core shaft (11), and a shielding plate of the front exhalation valve plate (13) cooperates with a front exhalation hole (18) at the bottom of the exhalation valve seat (1); a gasket (10) is sleeved above the shielding plate of the front exhalation valve plate (13), the gasket (10) is connected to the bottom end of the spring (15), and the top end of the spring (15) is connected to the bottom end of the guide block (17).

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