Respiratory protection mask provided with sealing self-checking device

Abstract

The invention relates to a respiratory protection mask provided with a sealing self-checking device, and belongs to the technical field of respiratory protection sealing detection of protection masks. The sealing self-checking device is composed of a mask body, an elastic key, an inspiration valve seat channel, an inspiration valve, a filtering element connector, an air channel and a locking ring, the elastic key made of silica gel or rubber materials is adopted to press and block an air inlet channel, and due to the fact that the elastic key is soft, the plane contact sealing effect of the elastic key and the inspiration valve seat channel is good after the elastic key is pressed; after pressing, the fingers are released to restore the original shape, and the operation is convenient; the device can be suitable for breathing protection masks such as full face masks, half masks, single-filtering-element connectors and double-filtering-element connectors. The defects that in the prior art, detection illusion is easily caused by a self-detection method of blocking an air inlet by hands, and an airtight detection cover plate needs to be closed by driving a hinge to rotate through a pull rod in a manner of adopting the airtight detection cover plate, operation is inconvenient, a user feels oppressed when closing the airtight detection cover plate, and the airtight detection cover plate needs to be pressed down again to return are overcome.

Description

Technical Field

[0001] The present invention relates to a respiratory protection mask equipped with a hermetic self-checking device, belonging to the technical field of respiratory protection seal detection of protection masks. Background Art

[0002] When people work in some special environments such as dusty environments or environments with biochemical pollution, in order to ensure normal breathing, people working in these air-polluted environments need to wear respiratory protection masks to prevent them from inhaling polluted air and suffering from health hazards.

[0003] An effective protection mask must meet two basic conditions. One is that harmful substances in the air can be removed through the filter element and air is allowed to pass through; the other is that the respiratory protection mask must fit closely with the user's face to block harmful substances from bypassing the filter element and entering the user's respiratory system. Now the technology of the mask body fitting the face is already very mature. The parts of the mask body that fit the face are designed and made by imitating the data of large, medium, and small adult national standard head models of different sizes. As long as it is designed and made according to this standard data and meets and obtains the corresponding national standard certification, there is no problem with the fitting of the respiratory mask. However, in actual use, due to improper wearing by the user or damage to the respiratory mask due to other factors, resulting in loss of function and the wearer not noticing, unnecessary accidents may occur. Then it is necessary for the user to perform a self-check on the respiratory protection mask and the mask hermeticity before entering the harmful environment. Most of the current self-checking methods are to block the inhalation interface position with the hand and then inhale to see if there is an obvious depression in the mask body to determine whether the mask is intact or the wearing is hermetically good. Since this method uses the hand to block the air inlet, it is very difficult to completely seal the air inlet during the operation process, and the subjectivity of the operation is too strong, which is likely to cause false detection.

[0004] In order to overcome the shortcomings of self-inspection by blocking the air inlet with hands, the applicant has designed a "protective mask with a detection device" that uses an airtight test cover to perform tightness detection. The application publication number is CN 108201665 A. The inspection method of the airtight test cover is to use a pull rod to pull up the airtight cover through a hinge structure to cover the intake valve plate, so that the intake valve plate cannot be opened to achieve the detection purpose. However, this detection method often has failure loopholes in actual application. The reason is that the air intake valve is generally a circular thin sheet of 0.3-0.5mm, and the material is mostly silicone or rubber. This material itself has a certain viscosity. In addition, long-term use in the mask cavity will generate hot air, which makes it easier for the air intake valve sheet to stick to the airtight detection cover. When the airtight detection cover is opened, it will also drive the valve sheet, so that the air intake valve sheet cannot be closed when it should be closed. The valve sheet may even stick to the airtight detection cover, and the valve sheet will be deformed and wrinkled when the cover is closed again. When the cover is closed again, the valve sheet cannot be completely sealed due to the wrinkles, resulting in the inability to complete the airtight detection. In addition, the sealing detection device can only be applied to half masks with a single filter element interface. Summary of the invention

[0005] The purpose of the present invention is to provide a self-test device for tightness that uses an elastic button to press and block the air inlet passage, in view of the above-mentioned shortcomings of the prior art that the self-test method of blocking the air inlet by hand is prone to cause detection illusions, and the airtight test cover is used for tightness detection. The self-test device can be restored to its original state by pressing and releasing the finger, and is easy to operate. It can be applied to half masks and full masks in respiratory protection masks, and can be applied to single filter element interfaces and double filter element interfaces.

[0006] The present invention achieves the above-mentioned purpose through the following technical solutions: A respiratory protection mask equipped with a close-fitting self-checking device, which consists of a mask body, an elastic button, an inhalation valve seat channel, an inhalation valve, a filter element interface, an airway and a locking ring, characterized in that: a T-shaped undercut groove is made on the mask body, a T-shaped undercut is made at the rear end of the airway, the rear end of the airway is pressed into the T-shaped undercut groove of the mask body through the T-shaped undercut, the annular hole in the middle of the front end of the airway is clamped on the skeleton convex ring of the mask body, and the front end of the airway is fixed to the mask body; the inhalation valve seat channel passes through the annular hole in the middle of the airway and is inserted into the middle hole of the mask body, the inhalation valve seat channel is fixed to the mask body by the locking ring, and the inhalation valve is installed in the valve seat hole at the rear end of the inhalation valve seat channel; the elastic button is installed in the front end of the inhalation valve seat channel, and the button on the elastic button extends out of the front end of the inhalation valve seat channel.

[0007] The airway and the mask body are assembled through the T-shaped undercut and the T-shaped undercut groove to form a hollow cavity structure.

[0008] A self-checking device gland is installed on the front end of the elastic button, and the self-checking device gland is buckled and fixed on the skeleton convex ring of the mask body.

[0009] The end of the filter element interface with a circular ring bayonet is fixed on the round hole of the air duct, and the other end of the filter element interface is buckled on the skeleton of the mask body. The air duct and the skeleton of the mask body are connected through the filter element interface.

[0010] A filter element interface sealing ring is installed at the connection between the filter element interface and the air duct.

[0011] The mask body and the skeleton of the mask body are connected through an exhalation valve seat, and the exhalation valve is installed in the valve seat hole of the exhalation valve seat.

[0012] An exhalation valve seat sealing ring is installed at the connection between the exhalation valve seat and the skeleton of the half-mask dual interface.

[0013] The beneficial effects of the present invention compared with the prior art are as follows: 1. Reliable sealing.

[0014] The elastic button is used to press and block the air intake channel. Since the elastic button is made of commonly used soft rubber such as silica gel or rubber, the material is relatively soft. After pressing, the elastic button will contact the plane of the air intake valve seat channel to achieve a sealing effect, which is more reasonable and reliable than the traditional method of blocking with hands.

[0015] 2. Good stability.

[0016] Compared with the method of closing and pressing the air intake valve piece with an airtight test cover plate on the market, it has better stability and safety, and the detection reliability is high.

[0017] Convenient operation.

[0018] The respiratory protective mask equipped with the airtight self-checking device uses an elastic button. Just press and then release the finger, and it can return to its original state, with convenient operation. The existing airtight detection cover plate method realizes the closing of the airtight detection cover plate by driving the hinge to rotate with a pull rod, which is inconvenient to operate. When pulling up the pull rod to close the airtight detection cover plate, there is a feeling of stuffiness, and it also needs to be pressed down again to return to the original position.

[0019] 4. Wide application range.

[0020] The respiratory protective mask equipped with a tight - fit self - checking device has a wide range of applications and can be used with all respiratory protective masks, such as full - face masks and half - face masks; both single - filter - element interfaces and double - filter - element interfaces can be used. Although there is no unified standard for the interfaces of the filter elements of respiratory protective masks at present, common interfaces on the market such as triangular interfaces, rotary interfaces, and threaded interfaces can meet the self - checking requirements of the respiratory protective mask as long as the filter - element interface is replaced with one that matches the interface of the respiratory protective mask equipped with the tight - fit self - checking device. Other methods through airtight detection covers can only be used on masks with single - filter - element interfaces. Brief Description of the Drawings

[0021] Figure 1 Schematic front - view structure diagram of the respiratory protective mask equipped with a tight - fit self - checking device; Figure 2 For Figure 1 A - A sectional structure diagram; Figure 3 Schematic structure diagram of the tight - fit self - checking device in the pressed - closed state; Figure 4 Exploded view of the tight - fit self - checking device; Figure 5 Schematic front - view structure diagram of the tight - fit self - checking device installed on a double - interface half - face mask; Figure 6 For Figure 5 B - B sectional structure diagram; Figure 7 Schematic structure diagram of the tight - fit self - checking device installed on a double - interface half - face mask in the pressed - closed state; Figure 8 Exploded view of the tight - fit self - checking device installed on a double - interface half - face mask; Figure 9 Schematic front - view structure diagram of the tight - fit self - checking device installed on a single - interface half - face mask; Figure 10 For Figure 9 C - C sectional structure diagram; Figure 11 Schematic structure diagram of the tight - fit self - checking device installed on a single - interface half - face mask in the pressed - closed state; Figure 12 Exploded view of the tight - fit self - checking device installed on a single - interface half - face mask; Figure 13 Schematic structure diagram of the tight - fit self - checking device installed on a double - interface full - face mask; Figure 14 Exploded view of the tight - fit self - checking device installed on a double - interface full - face mask; Figure 15 Schematic structure diagram of the tight - fit self - checking device installed on a single - interface full - face mask; Figure 16 This is an exploded view of the tight self-test device installed on a single-interface full face mask; Figure 17 It is a structural schematic diagram of a double-interface half mask for respiratory protection in the prior art; Figure 18 for Figure 17 Schematic diagram of DD cross-sectional structure.

[0022] In the figure: 1. mask body, 101. T-shaped inverted groove, 2. elastic button, 201. button, 3. inhalation valve seat channel, 4. inhalation valve, 5. filter element interface, 501. circular bayonet, 6. airway, 601. T-shaped inverted, 7. locking ring, 8. self-test device gland, 9. exhalation valve seat, 10 exhalation valve, 11. exhalation valve cover, 12. filter element interface sealing ring, 13. exhalation valve seat sealing ring, 14. half mask double interface frame, 15. single interface mask main frame, 16. full mask main frame. DETAILED DESCRIPTION

[0023] The following is combined with Figure 1-16 The present invention is further described as follows. The front end and rear end involved in the following description refer to the end of the protective mask and components away from the human face, and the rear end refers to the end of the protective mask and components close to the human face.

[0024] The respiratory protective mask equipped with a close fitting self-checking device is composed of a mask body 1, an elastic button 2, an inhalation valve seat channel 3, an inhalation valve 4, a filter element interface 5, an airway 6 and a locking ring 7. The close fitting self-checking device is composed of an elastic button 2, an inhalation valve seat channel 3, an inhalation valve 4, a filter element interface 5, an airway 6 and a locking ring 7. A T-shaped undercut groove 101 is made on the mask body 1, and a T-shaped undercut 601 is made at the rear end of the airway 6. The rear end of the airway 6 is buckled in the T-shaped undercut groove 101 of the mask body 1 through the T-shaped undercut 601; the annular hole in the middle of the front end of the airway 6 is clamped on the skeleton convex ring of the mask body 1, and the front end of the airway 6 is fixed on the mask body 1; the airway 6 and the mask body 1 are assembled through the T-shaped undercut 601 and the T-shaped undercut groove 101 to form a hollow cavity structure.

[0025] Further, the suction valve seat passage 3 passes through the circular hole in the middle of the airway 6 and then inserts into the middle hole of the mask body 1. The suction valve seat passage 3 is fixed on the mask body 1 through the locking ring 7. The suction valve 4 is installed in the valve seat hole at the rear end of the suction valve seat passage 3. The elastic button 2 is installed inside the front end of the suction valve seat passage 3, and the button 201 on the elastic button 2 extends outside the front end of the suction valve seat passage 3, facilitating the user to press. When the elastic button 2 is installed on a single-interface half mask or a double-interface half mask, a self-check device gland 8 is installed on the front end of the elastic button 2, and the self-check device gland 8 is buckled and fixed on the skeleton convex ring of the mask body 1.

[0026] Further, the end of the filter element interface 5 with the circular bayonet 501 is fixed on the circular hole of the airway 6, and the other end of the filter element interface 5 is buckled on the skeleton of the mask body 1. The airway 6 and the skeleton of the mask body 1 are connected through the filter element interface 5. A filter element interface sealing ring 12 is installed at the connection between the filter element interface 5 and the airway 6 to prevent air leakage at the connection between the filter element interface 5 and the airway 6.

[0027] Further, the mask body 1 and the skeleton of the mask body 1 are connected through an exhalation valve seat 9, and the exhalation valve 10 is installed in the valve seat hole of the exhalation valve seat 9. An exhalation valve seat sealing ring 13 is installed at the connection between the exhalation valve seat 9 and the double-interface skeleton 14 of the half mask.

[0028] The working principle of the respiratory protection mask equipped with the airtight self-check device is as follows. Taking the respiratory protection double-interface mask as an example, when the existing respiratory protection double-interface mask on the market inhales, the gas is filtered by the filter elements on both sides and then directly enters the mask body through the filter element interface 5 (see the appendix Figure 17-18 ); while the gas of the present invention is filtered by the filter elements on both sides, then enters the hollow cavity formed by the airway 6 and the mask body 1 through the filter element interfaces 5 on both sides of the airway, and then enters the mask body 1 through the suction valve seat passage 3 and the suction valve 4 in the middle of the mask. In addition, an elastic button 2 is installed at the front end of the suction valve seat passage 3 of the present invention. When the user needs to perform an airtightness detection during wearing, press the button 201 of the elastic button 2, and the elastic button 2 will block the suction valve seat passage 3 to prevent the gas from entering (see the appendix Figure 7 ). At this time, the wearer cannot inhale and will feel stuffy, indicating that there is no leakage in the respiratory protection mask. When the detection is completed, release the button 201, and the elastic button 2 will return to its original state under the action of the elastic force, and the suction channel will resume unblocked.

[0029] In the case of a single-interface respiratory protection mask on the market, when inhaling, the gas is filtered by a single filter element and then directly enters the mask body through the filter element interface 5. In the present invention, after the gas is filtered by a single filter element, it first enters the hollow cavity formed by the airway 6 and the mask body 1, and then enters the mask body 1 through the upper inhalation valve seat passage 3 and the inhalation valve 4. Its usage method is the same as that of the above double-filter element interface.

[0030] Since respiratory protection masks are divided into half masks and full masks, a half mask refers to a tight-fitting mask that can cover the mouth, nose and mandible, and a full mask refers to a tight-fitting mask that can cover the eyes, mouth, nose and mandible. The positions where the airtight self-check device is installed on the respiratory protection mask are slightly different, and are described separately as follows.

[0031] Application of the present invention on the double-interface filter element of a respiratory protection half mask (see appendix Figure 5-8 ). When the present invention is applied to the double interface of the half mask, the airtight self-check device is installed on the double-interface skeleton 14 of the half mask and fixed on the double-interface skeleton 14 of the half mask through the self-check device gland 8. The exhalation part realizes the fixed connection between the mask body 1 and the double-interface skeleton 14 of the half mask through the exhalation device composed of the exhalation valve cover 11, the exhalation valve 4, the exhalation valve seat 9, and the exhalation valve seat sealing ring 13.

[0032] Application of the present invention on the single-interface filter element of a respiratory protection half mask (see appendix Figure 9-12 ). When the present invention is applied to the single interface of the half mask, the airtight self-check device is installed on the single-interface skeleton of the half mask and fixed on the mask body skeleton through the self-check device gland 8. The exhalation part realizes the fixed connection between the mask body 1 and the half-mask body skeleton 14 through the exhalation device composed of the exhalation valve cover 11, the exhalation valve 4, the exhalation valve seat 9, and the exhalation valve seat sealing ring 13.

[0033] Application of the present invention on the double interface of a full mask (see appendix Figure 13-14 ). It installs the airtight self-check device on the mask body 1 of the double interface of the full mask and fixes it on the mask body 1 through the self-check device gland 8. The exhalation part realizes the fixed connection between the mask body 1 and the full-mask body skeleton (the full-mask body skeleton described here is the full-mask mirror screen) through the exhalation device composed of the exhalation valve cover 11, the exhalation valve 4, the exhalation valve seat 9, and the exhalation valve seat sealing ring 13.

[0034] Application of the present invention on the single interface of a full mask (see appendix Figure 15-16), in which the airtight self-checking device is installed on the main body 1 of the full-face mask with a single interface. It is fixed on the main body 1 of the mask through the gland 8 of the self-checking device. The exhalation part realizes the fixed connection between the main body 1 of the mask and the full-face mask main body skeleton (the full-face mask main body skeleton mentioned here is the full-face mask mirror screen) through the exhalation device composed of the exhalation valve cover 11, the exhalation valve 4, the exhalation valve seat 9, and the exhalation valve seat sealing ring 13.

[0035] The above is only the preferred embodiment of the present invention. The above examples do not impose any formal restrictions on the essence of the present invention. Any simple modification or deformation made by those of ordinary skill in the art to the above specific embodiments based on the technical essence of the present invention after reading this specification, and any equivalent embodiments that may be changed or modified by using the above-disclosed technical content into equivalent changes, still fall within the scope of the technical solution of the present invention without departing from the essence and scope of the present invention.

Claims

1. A respiratory protective mask equipped with a close fitting self-checking device, which comprises a mask body (1), an elastic button (2), an inhalation valve seat channel (3), an inhalation valve (4), a filter element interface (5), an airway (6) and a locking ring (7), characterized in that: The mask body (1) is provided with a T-shaped undercut groove (101), the rear end of the airway (6) is provided with a T-shaped undercut (601), the rear end of the airway (6) is buckled into the T-shaped undercut groove (101) of the mask body (1) through the T-shaped undercut (601), the annular hole in the middle of the front end of the airway (6) is clamped on the skeleton convex ring of the mask body (1), and the front end of the airway (6) is fixed on the mask body (1); the inhalation valve seat is provided with a T-shaped undercut (601) and a T-shaped undercut (601) is provided on the rear end of the airway (6). The air passage (3) passes through the annular hole in the middle of the air passage (6) and is inserted into the middle hole of the mask body (1); the air intake valve seat passage (3) is fixed to the mask body (1) by a locking ring (7); the air intake valve (4) is installed in the valve seat hole at the rear end of the air intake valve seat passage (3); the elastic button (2) is installed in the front end of the air intake valve seat passage (3); and the button (201) on the elastic button (2) extends out of the front end of the air intake valve seat passage (3).

2. A respiratory protective mask equipped with a close fit self-checking device according to claim 1, characterized in that: The airway (6) and the mask body (1) are assembled via the T-shaped undercut (601) and the T-shaped undercut groove (101) to form a hollow cavity structure.

3. A respiratory protective mask equipped with a close fit self-checking device according to claim 1, characterized in that: A self-test device pressure cover (8) is mounted on the front end of the elastic button (2), and the self-test device pressure cover (8) is buckled and fixed on the frame convex ring of the mask body (1).

4. A respiratory protective mask equipped with a close fit self-checking device according to claim 1, characterized in that: The end of the filter element interface (5) having a circular bayonet (501) is fixed to the circular hole of the airway (6), and the other end of the filter element interface (5) is buckled onto the frame of the mask body (1). The airway (6) and the frame of the mask body (1) are connected via the filter element interface (5).

5. A respiratory protective mask equipped with a close fit self-checking device according to claim 1, characterized in that: A filter element interface sealing ring (12) is provided at the connection between the filter element interface (5) and the airway (6).

6. A respiratory protective mask equipped with a close fit self-checking device according to claim 1, characterized in that: The mask body (1) is connected to the frame of the mask body (1) via an exhalation valve seat (9), and the exhalation valve (10) is installed in a valve seat hole of the exhalation valve seat (9).

7. A respiratory protective mask equipped with a close fit self-checking device according to claim 6, characterized in that: An exhalation valve seat sealing ring (13) is installed at the connection between the exhalation valve seat (9) and the half-mask double-interface frame (14).

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