Positive pressure protective clothing and air tightness detection method thereof

Abstract

The positive pressure protective clothing comprises a protective clothing body and a one-way exhaust valve, the one-way exhaust valve comprises a protective cover, a sealing piece and an exhaust valve plate, the protective cover is arranged on the protective clothing body and communicated with the interior of the protective clothing body, an exhaust port is formed in the protective cover, and the exhaust valve plate is arranged in the protective cover and communicated with the interior of the protective clothing body. The protective cover is provided with an exhaust port, the exhaust port is arranged outside the protective cover and located at the exhaust port, and the sealing piece is arranged outside the protective cover and located at the exhaust port and used for closing or opening the exhaust port. By adopting the positive pressure protective clothing and the air tightness detection method thereof, any multiple times of air tightness detection and verification before delivery, acceptance inspection and issuing use can be met, a user entering a dangerous operation area can be ensured to get the positive pressure protective clothing without leakage and damage points, and the use safety is ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of protective clothing, and in particular relates to a positive pressure protective clothing and an air tightness detection method thereof. Background Art

[0002] The full-body fully airtight positive pressure protective suit is the highest level of protection for nuclear, biological and chemical protective suits. This type of protective suit is made of isolation fabrics and is designed with air supply interfaces, airtight zippers and one-way exhaust valves. During use, the airtight zipper is closed after the personnel put it on, and the filtered and purified compressed air is connected to the protective suit air supply interface through the air supply pipe, and the clean air is transported to the inside of the protective suit for breathing and to maintain the positive pressure of the protective suit. After circulating in the protective suit, the gas exchanged by breathing and heat dissipation is discharged into the environment through the one-way exhaust valve.

[0003] The structure and working principle of positive pressure protective clothing enable it to build a complete barrier, which can effectively block various hazardous substances in the working environment, such as radioactive aerosols, toxic and harmful chemical substances, biological agents, etc., and thus be used in workplaces with the highest risk of nuclear, biological and chemical hazards, providing users with the highest level of full-body protection and respiratory protection.

[0004] However, the key to achieving the expected protective function of positive pressure protective clothing is its integrity and airtightness. If there are leaks or damage points in the protective clothing, radioactive aerosols, toxic and harmful chemical substances, biological agents, etc. from the outside may enter the protective clothing through the leaks and damage points, thereby causing the protective clothing to lose its protective effect and endangering the health and safety of personnel. In addition to the possibility of damage during use, protective clothing may also be damaged during processing due to processing errors or accidental mechanical injuries, such as external force tearing, puncture, and friction, small tears in the fabric of the protective clothing, loose heat-sealed seams, emergency tear tape welding, etc., which may cause leaks and damage points in the protective clothing, posing safety hazards to use.

[0005] Therefore, it is very necessary to conduct integrity and airtightness tests before the positive pressure protective clothing leaves the factory, and before the user purchases and stores it for a period of time and before it is officially released for use, so as to confirm that the protective clothing is still intact.

[0006] At present, there are two main conventional methods for testing the air tightness of common positive pressure protective clothing: one is visual inspection, in which personnel carefully observe various parts of the protective clothing based on experience to determine whether there are leaks or damage points; the other is pressure drop test, which is to use an air tightness tester for testing. The principle is to seal all the ventilation interfaces on the structural design of the protective clothing, and then inflate the protective clothing to a certain pressure, such as 500-2000Pa, through an air pump and an air inlet, and then close the air inlet. The relative pressure difference is tested by connecting to a pressure sensor in the protective clothing, and the pressure drop value within a certain period of time is recorded. The size of the pressure drop value is used to determine whether the protective clothing has leaks or damage points.

[0007] Visual inspection is subjective and has human factors problems, and it is easy to miss leakage and damage points; while the pressure drop method test can test the overall air tightness of protective clothing more comprehensively and objectively, avoiding the subjectivity and human errors of visual inspection. However, due to the presence of a one-way exhaust valve in protective clothing, the one-way exhaust valve must be sealed when the pressure drop method uses an air tightness tester to perform air tightness testing. At present, all kinds of traditional one-way exhaust valves do not have a good sealing method. They are either sealed by glue or sealed by sealing tape. These methods are not only not tightly sealed, but also cause pollution and damage to the one-way exhaust valve of the protective clothing. Protective clothing that has passed the air tightness test is often no longer usable. Therefore, this destructive test can only be used for random inspections and experiments, and it is impossible to achieve a mandatory inspection of each piece before leaving the factory or before use. Therefore, the current positive pressure protective clothing can only be visually detected for leaks and damage points before leaving the factory and before use. This method cannot ensure the absolute complete air tightness of the protective clothing. A non-destructive and accurately quantifiable air tightness detection method is urgently needed. Summary of the invention

[0008] In view of the defects existing in the prior art, the purpose of the present invention is to provide a positive pressure protective clothing and an air tightness detection method thereof, which can directly use the pressure drop method and an air tightness detector to perform a comprehensive air tightness detection before leaving the factory and before use.

[0009] To achieve the above purpose, the technical solution adopted by the present invention is: a positive pressure protective clothing, comprising: a protective clothing body and a one-way exhaust valve, the one-way exhaust valve comprising a protective cover, a sealing member and an exhaust valve sheet, the protective cover is arranged on the protective clothing body and is connected to the interior of the protective clothing body, an exhaust port is opened on the protective cover, the exhaust valve sheet is arranged in the protective cover and is located at the exhaust port, the sealing member is arranged outside the protective cover and is located at the exhaust port, and is used to close or open the exhaust port.

[0010] Furthermore, the sealing member is a tear tape, which is heat-sealed on the exhaust port to close the exhaust port.

[0011] Furthermore, pull tabs are reserved at both ends of the sealing member.

[0012] Furthermore, the sealing element is an airtight zipper.

[0013] Furthermore, there are multiple one-way exhaust valves, and the multiple one-way exhaust valves are all arranged on the protective clothing body.

[0014] Furthermore, the protective suit body has a positive pressure of 20-200Pa.

[0015] Furthermore, the protective cover includes a connecting portion and an exhaust portion, the connecting portion is arranged around the exhaust portion, and one end away from the exhaust portion is connected to the protective clothing body, and the exhaust port is arranged on the exhaust portion.

[0016] Furthermore, the connecting portion is seal-welded to the protective clothing body.

[0017] Furthermore, the one-way exhaust valve also includes a connection protection shell, which is located inside the protection cover and is used to fix the exhaust valve plate inside the protection cover.

[0018] The present invention also provides a method for detecting the air tightness of a positive pressure protective suit, comprising the steps of: connecting the air supply interface of the detector to the air supply port of the protective suit, and preventing air leakage at the interface; supplying air into the protective suit body, and recording the pressure inside the protective suit at the same time, and stopping the air supply when the pressure reaches a predetermined value; keeping the protective suit body static, and recording the pressure value at the initial moment and the pressure value after a predetermined time; and determining whether there is a leak or damage point in the protective suit body through the pressure difference between the pressure value at the initial moment and the pressure value after a predetermined time.

[0019] The effect of the present invention is that it can meet any number of air tightness tests and verifications before leaving the factory, acceptance, and distribution for use, ensuring that users entering dangerous working areas can obtain positive pressure protective clothing with no leakage or damage points, thereby ensuring safety in use.

[0020] The pressure drop method and air tightness tester can be directly used to conduct comprehensive and objective air tightness testing, avoiding the reliance of visual inspection on human factors, improving accuracy, and reducing the difficulty of judging and identifying qualified products for factory inspection and procurement acceptance of protective clothing.

[0021] The air-tightness test does not require the sealing of the one-way exhaust valve. Multiple air-tightness tests and verifications will not cause any damage to the protective clothing itself and will not affect subsequent use. On the one hand, it can save costs, and on the other hand, it can ensure that each piece is inspected, greatly improving safety.

[0022] The method of opening the exhaust port after the air tightness test is simple and efficient, does not require the use of any scissors or other tools, has no safety hazards, and will not cause other damage that affects use. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of a positive pressure protective suit;

[0024] Figure 2 It is a schematic diagram of the structure of the protective cover and the sealing member;

[0025] Figure 3 It is a schematic diagram of the structure of the exhaust port on the protective cover;

[0026] Figure 4 It is a schematic diagram of the structure when the sealing member is a tear strip;

[0027] Figure 5 It is a schematic diagram of the tearing process of the tearing strip;

[0028] Figure 6 It is a schematic diagram of the structure after the tearing tape is torn;

[0029] Figure 7 It is a schematic diagram of the structure when the sealing member is an airtight zipper;

[0030] Figure 8 It is a schematic diagram of the structure after the airtight zipper is opened;

[0031] Fig. 9 It is a schematic diagram of the gas flow direction in the one-way exhaust valve;

[0032] Fig.10 It is a flow chart of air tightness inspection;

[0033] Description of reference numerals:

[0034] 1. One-way exhaust valve; 11. Protective cover; 12. Sealing member; 111. Connecting part; 112. Exhaust part. DETAILED DESCRIPTION

[0035] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0036] like Figure 1-9 As shown, the present invention proposes a positive pressure protective clothing including a protective clothing body and a one-way exhaust valve 1, the one-way exhaust valve including a protective cover 11, a sealing member 12 and an exhaust valve sheet, the protective cover 11 is arranged on the protective clothing body and is connected to the inside of the protective clothing body, an exhaust port is opened on the protective cover 11, the exhaust valve sheet is arranged in the protective cover 11 and is located at the exhaust port, the sealing member 12 is arranged outside the protective cover 11 and is located at the exhaust port, and is used to close or open the exhaust port.

[0037] It can be understood that the exhaust valve sheet is used to allow the gas in the protective clothing body to be discharged through the exhaust port, thereby realizing the function of one-way exhaust.

[0038] It can be understood that when the seal 12 seals the exhaust port, the air tightness test of the protective suit body can be performed using the pressure drop method. After the test is qualified, the exhaust port can be opened and the positive pressure protective suit can be used normally.

[0039] It can be understood that the protective clothing body is an integrated structure, usually using insulating materials such as PVC, composite rubber and other membrane materials as the fabric, and is composed of a fully transparent window hood, torso, gloves, shoe covers, airtight zipper, air intake interface, emergency tear strip, air flow distribution and other structures.

[0040] Furthermore, the sealing member 12 is a tear tape, which is heat-sealed on the exhaust port to seal the exhaust port.

[0041] Furthermore, pull tabs are reserved at both ends of the sealing member 12 .

[0042] In this embodiment, the tear strip is formed by welding a guide material on the opening path using a high-frequency heat-sealing process, and pull heads are reserved at both ends. The tearing from any end can be pulled to the other end and stopped, thereby quickly opening an opening on the protective cover 11 to form an exhaust channel. The length of the opening path is less than or equal to the side length of the lower end of the protective cover. To facilitate pulling, the two ends of the heat-sealing mold are designed to be sharp-angled. After heat-sealing, the connection area between the tear strip and the protective cover has the same shape as the mold, with sharp corners at both ends, which is easy to effectively tear to form an opening.

[0043] Furthermore, the sealing member 12 is an airtight zipper.

[0044] It is understood that for a disposable positive pressure protective suit, the sealing member 12 can be set as a tear tape, and the protective suit can be used by tearing off the tear tape after the test is completed. For a reusable positive pressure protective suit, the sealing member 12 is set as an airtight zipper to achieve the effect of opening or closing the exhaust port, so as to facilitate another airtightness test before the next use.

[0045] It can be understood that for disposable positive pressure protective clothing, the airtight zipper method can also be used, that is, a small airtight zipper is designed on the fully enclosed protective cover 11 outside the one-way exhaust valve. During the pressure drop method air tightness test, the airtight zipper can be pulled and closed to achieve the closure of the exhaust valve. After the test, the airtight zipper can be opened to achieve a normal exhaust channel.

[0046] In this embodiment, the zipper is sealed and welded to the protective cover using high-frequency heat sealing and other processes. During the pressure drop method air tightness test, the airtight zipper can be closed to achieve the closure of the exhaust valve. After the test, the airtight zipper can be opened to achieve a normal exhaust channel.

[0047] Furthermore, there are multiple one-way exhaust valves, and the multiple one-way exhaust valves are all arranged on the protective clothing body.

[0048] Furthermore, the protective suit body has a positive pressure of 20-200Pa.

[0049] It can be understood that the target positive pressure value can be dynamically maintained in the protective suit body through the number of one-way exhaust valves and the selection and design of the exhaust port size.

[0050] Furthermore, the protective cover 11 includes a connecting portion 111 and an exhaust portion 112 . The connecting portion 111 is arranged around the exhaust portion 112 , and one end away from the exhaust portion 112 is connected to the protective clothing body. The exhaust port is arranged on the exhaust portion 112 .

[0051] It can be understood that the connection portion 111 and the exhaust portion 112 can be formed in one piece, or can be connected in any other manner, as long as they are connected to the protective cover body.

[0052] Furthermore, the connection portion 111 is sealed and welded to the protective clothing body.

[0053] In this embodiment, the exhaust port is in a rectangular shape. In other embodiments, the exhaust port may be in any shape as long as it can cooperate with the exhaust valve sheet to achieve one-way exhaust and can be sealed or opened by the seal 12 .

[0054] In this embodiment, the shape of the protective cover 11 is square. In other embodiments, the protective cover 11 can be of any shape as long as it can be connected to the protective clothing body and communicated with the inside of the protective clothing body.

[0055] Furthermore, the one-way exhaust valve 1 also includes a connection protection shell, which is located in the protection cover 11 and is used to fix the exhaust valve plate in the protection cover 11 and prevent the exhaust valve from closing and failing to exhaust normally due to external force.

[0056] See also Fig.10 The present invention also provides a method for detecting air tightness of a positive pressure protective clothing, comprising the steps of:

[0057] S1, connect the air supply interface of the detector to the air supply port of the protective clothing, and there is no air leakage at the interface;

[0058] S2, supplying air into the protective suit body and recording the pressure inside the protective suit. When the pressure reaches a preset value, stop supplying air;

[0059] S3, keep the protective suit static and record the pressure value at the initial moment and the pressure value after a predetermined time;

[0060] S4, judging whether there is a leak or damage point on the protective clothing body by the pressure difference between the initial pressure value and the pressure value after a predetermined time;

[0061] Specifically, the air-tightness test is carried out using the pressure drop method. For disposable positive-pressure protective clothing such as radioactive contamination protective clothing, the exhaust port of the one-way exhaust valve protective cover is initially a closed structure. For positive-pressure protective clothing that can be used multiple times, the small airtight zipper on the exhaust port of the one-way exhaust valve protective cover is checked before testing to ensure that the zipper is closed.

[0062] The pressure drop method is completed using an air tightness tester, which consists of an air pump, a pressure gauge, a connecting pipe, a switch, a timer, and a valve. During the test, close the airtight zipper on the exhaust port, connect the air supply interface of the tester to the air supply port of the protective suit body, and check that there is no air leakage at the interface. Turn on the air supply switch, the air pump supplies air to the protective suit body, and the pressure gauge records the pressure inside the protective suit body at the same time; when the pressure reaches a certain value, such as a specific pressure between 1000Pa and 2000Pa, close the air supply valve and the air pump, keep the protective suit static, and observe the pressure drop process. After the pressure drops to a specific pressure value between 1000Pa and 2000Pa, record the pressure as the initial pressure, start timing, and after waiting for a specific time of 2 to 10 minutes, stop timing and record the pressure at that moment as the pressure at the stop time. Calculate the pressure difference from the initial to the stop time, and use this size to determine whether there is a leak or damage point in the protective suit.

[0063] It can be seen from the above embodiments that the present invention can meet any number of air tightness tests and verifications before leaving the factory, acceptance, and distribution for use, ensuring that users entering dangerous working areas can obtain positive pressure protective clothing with no leakage or damage points, thereby ensuring safety of use.

[0064] The pressure drop method and air tightness tester can be directly used to conduct comprehensive and objective air tightness testing, avoiding the reliance of visual inspection on human factors, improving accuracy, and reducing the difficulty of judging and identifying qualified products for factory inspection and procurement acceptance of protective clothing.

[0065] The air-tightness test does not require the sealing of the one-way exhaust valve. Multiple air-tightness tests and verifications will not cause any damage to the protective clothing itself and will not affect subsequent use. On the one hand, it can save costs, and on the other hand, it can ensure that each piece is inspected, greatly improving safety.

[0066] The method of opening the exhaust port after the air tightness test is simple and efficient, does not require the use of any scissors or other tools, has no safety hazards, and will not cause other damage that affects use.

[0067] The present invention is not limited to the embodiments described in the specific implementation manner. Those skilled in the art may derive other implementation manners based on the technical solution of the present invention, which also fall within the technical innovation scope of the present invention.

Claims

1. A positive pressure protective suit, characterized in that: include: A protective suit body and a one-way exhaust valve, wherein the one-way exhaust valve comprises a protective cover, a sealing member and an exhaust valve sheet. The protective cover is arranged on the protective suit body and is communicated with the interior of the protective suit body, and an exhaust port is opened on the protective cover. The exhaust valve sheet is arranged in the protective cover and located at the exhaust port. The sealing member is arranged outside the protective cover and located at the exhaust port, and is used to close or open the exhaust port.

2. A positive pressure protective clothing as claimed in claim 1, characterized in that: The sealing member is a tear tape, which is heat-sealed on the exhaust port to close the exhaust port.

3. A positive pressure protective clothing as claimed in claim 2, characterized in that: Pull heads are reserved at both ends of the sealing member.

4. A positive pressure protective clothing as claimed in claim 1, characterized in that: The sealing member is an airtight zipper.

5. The positive pressure protective clothing according to claim 1, characterized in that: There are multiple one-way exhaust valves, and the multiple one-way exhaust valves are all arranged on the protective clothing body.

6. A positive pressure protective clothing as claimed in claim 5, characterized in that: The protective suit body has a positive pressure of 20-200Pa.

7. The positive pressure protective clothing according to claim 1, characterized in that: The protective cover comprises a connecting portion and an exhaust portion, wherein the connecting portion is arranged around the exhaust portion, and one end away from the exhaust portion is connected to the protective clothing body, and the exhaust port is arranged on the exhaust portion.

8. A positive pressure protective clothing as claimed in claim 7, characterized in that: The connecting portion is sealed and welded to the protective clothing body.

9. The positive pressure protective clothing according to claim 1, characterized in that: The one-way exhaust valve also includes a connection protection shell, which is located in the protection cover and is used to fix the exhaust valve plate in the protection cover and prevent the exhaust valve from closing due to external force and failing to exhaust normally.

10. A method for detecting air tightness of a positive pressure protective clothing as claimed in claims 1 to 9, characterized in that: Includes steps: Connect the air supply interface of the detector to the air supply port of the protective clothing, and there should be no air leakage at the interface; Supply air to the protective suit body and record the pressure inside the protective suit at the same time. When the pressure reaches the preset value, stop supplying air; Keep the protective suit static and record the pressure value at the initial moment and the pressure value after a predetermined time; The pressure difference between the initial pressure value and the pressure value after a predetermined time is used to determine whether there is a leak or damage point on the protective clothing body.

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