阅读说明：本技术 一种漏气检测方法 (Air leakage detection method ) 是由 刘烜 林赵光 曾柳军 梁诏东 刘春杏 于 2021-08-11 设计创作，主要内容包括：本发明涉及工业检测领域,具体公开了一种漏气检测方法,包括墙体、防护密闭门、若干封条、涂布在封条内表面的变色剂以及将要施压的反应气体,粉末变色剂遇到反应气体会变色。通过显色的方式判断防护密闭门,变色程度越深的地方说明该处越接近漏气点,可以更加准确地反映漏气的位置,方便操作人员进行分析。采用容易与氧气或二氧化碳反应变色的物质,制备反应气体方便,分开保存封条和粉末变色剂有助于延长仓储周期,而且封条预装不干胶,除了方便固定封条之外,还方便附着粉末变色剂。(The invention relates to the field of industrial detection, and particularly discloses a gas leakage detection method which comprises a wall body, a protective airtight door, a plurality of sealing strips, a color-changing agent coated on the inner surfaces of the sealing strips and a reaction gas to be pressed, wherein the color-changing agent in powder can change color when meeting the reaction gas. The protective airtight door is judged in a color development mode, and the deeper the color change degree, the closer the position is to the air leakage point, so that the air leakage position can be more accurately reflected, and an operator can conveniently analyze the position. The sealing strip is preloaded with adhesive, so that the powder color-changing agent is conveniently attached to the sealing strip besides the convenience for fixing the sealing strip.)

1. A method of leak detection, comprising: the protective airtight door comprises a wall body, a protective airtight door arranged on the front side of the wall body and a plurality of sealing strips;

the wall body is used as a bearing main body and connected with the protective airtight door, the front side of the wall body is sunken, a cavity is formed in the wall body, at least three pipelines are arranged on the back side of the wall body, the three pipelines are respectively called an air inlet pipe, an air suction pipe and a detection pipe, the air inlet pipe is communicated with the cavity and an air inlet pump, the air suction pipe is communicated with the cavity and the air suction pump, and the detection pipe is communicated with the cavity and an air pressure detector;

the protective airtight door comprises a door frame and a door plate, the periphery of the door frame is attached to the wall body, the door plate is arranged in the door frame, and the door plate covers the cavity when closed;

part of the seal covers the gap between the wall and the door frame, part of the seal covers the gap between the door frame and the door panel, and powder color-changing agents are arranged on the inner side of the seal aligning gap;

when the door panel is closed, only the air exhaust pipe is opened, the cavity is evacuated through the air exhaust pipe, then a plurality of seals are fixed at corresponding positions, and the air exhaust pipe is closed; only open the intake pipe, past through the intake pipe reactant gas is injected into in the cavity, reactant gas can react with the powder color-changing agent on the strip of paper used for sealing and makes the corresponding position of strip of paper used for sealing change color, maintains the atmospheric pressure of settlement to the time of settlement, and the position of gas leakage is judged to the position and the degree of discolouring on the last inspection strip of paper used for sealing, confirms whether the clearance leaks gas and the position of gas leakage.

2. The gas leakage detection method according to claim 1, characterized in that: the cross section of part the strip of paper used for sealing is the U-shaped, both ends are used for connecting about the strip of paper used for sealing the wall body or the position of protective airtight door is provided with the non-setting adhesive, the middle uplift of strip of paper used for sealing is used for accomodating reactant gas's position and is provided with the non-setting adhesive.

3. The gas leakage detection method according to claim 1, characterized in that: the cross section of part the strip of paper used for sealing is the L shape, both ends are used for connecting about the strip of paper used for sealing the wall body or the position of protective airtight door is provided with the non-setting adhesive, accomodate in the centre of strip of paper used for sealing the position of reactant gas is provided with the non-setting adhesive.

4. The gas leakage detection method according to claim 2 or 3, characterized in that: when the seal is manufactured, the seal is processed into a long strip shape, and the self-adhesive and the protective film thereof are adhered on the inner side; when the seal is used, the seal is cut according to the required length, the protective film of the non-setting adhesive is torn, the powder color-changing agent is coated in the middle position of the seal in situ, the non-setting adhesive is used for fixing the powder color-changing agent, and finally the seal is stuck to the corresponding position.

5. The gas leakage detection method according to claim 4, characterized in that: and after the seal is fixed, coating sealant on the edge of the seal and the splicing position of two adjacent seals.

6. The gas leakage detection method according to claim 5, characterized in that: the seal and the adhesive sticker are both made of transparent materials.

7. The gas leakage detection method according to claim 5, characterized in that: the seal is made of opaque materials.

8. The gas leakage detection method according to claim 6 or 7, characterized in that: the wall body is made of high-strength steel.

9. The gas leakage detection method according to claim 8, characterized in that: the powder color-changing agent is Na₂O₂The reaction gas is CO₂(ii) a Or the powder color-changing agent is FE (OH)₂The reaction gas is O₂(ii) a Or the powder color-changing agent is tea polyphenol, and the reaction gas is O₂。

Technical Field

The invention belongs to the field of industrial detection, and particularly relates to a gas leakage detection method.

Background

The protective airtight door is responsible for the tasks of engineering airtight performance, three-proofing ventilation conversion and wartime personnel matrix protection, and the protective airtight door is a product produced by a fixed-point manufacturer at present, and although the protective airtight door is processed according to the design drawing requirements, gaps exist between a door body and a door frame more or less due to process differences and processing errors. At this time, a product (a protective airtight door) needs to be checked at random. National civil air defense industry standards RFJ01-2002 and RFJ04-2009 provide detection requirements for performances of a sealed door and a protective sealed door, and determine maximum allowable air leakage of various specifications and models and a test method. The experimental method for the gas tightness performance generally comprises a flow method and a pressure drop method, wherein gas with certain pressure is filled in a sealing chamber, and the pressure drop rate is detected after the sealing chamber is maintained for 24 hours approximately to judge whether the sealing chamber leaks gas or not.

In a detection mode, a simulation wall body (which can be of a concrete structure or a steel bar plate structure) is arranged in a factory, a product to be detected is installed on the simulation wall body, then gas is injected into a protective airtight door for pressurization, and whether gas leaks between the protective airtight door and the simulation wall body or not is detected. If air leakage occurs, the detection personnel cannot accurately judge where the abnormality occurs, and can only roughly draw the conclusion of air leakage. It can be seen that there is still much room for improvement in the prior art.

The above background disclosure is only for the purpose of assisting understanding of the inventive concept and technical solutions of the present invention, and does not necessarily belong to the prior art of the present patent application, and should not be used for evaluating the novelty and inventive step of the present application in the case that there is no clear evidence that the above content is disclosed at the filing date of the present patent application.

Disclosure of Invention

The invention aims to provide a gas leakage detection method which can accurately reflect the gas leakage position of a protective airtight door and the structure of the protective airtight door.

In order to achieve the above object, the present invention provides a gas leakage detecting method, including: the protective airtight door comprises a wall body, a protective airtight door arranged on the front side of the wall body and a plurality of sealing strips; the wall body is used as a bearing main body and connected with the protective airtight door, the front side of the wall body is sunken, a cavity is formed in the wall body, at least three pipelines are arranged on the back side of the wall body, the three pipelines are respectively called an air inlet pipe, an air suction pipe and a detection pipe, the air inlet pipe is communicated with the cavity and an air inlet pump, the air suction pipe is communicated with the cavity and the air suction pump, and the detection pipe is communicated with the cavity and an air pressure detector; the protective airtight door comprises a door frame and a door plate, the periphery of the door frame is attached to the wall body, the door plate is arranged in the door frame, and the door plate covers the cavity when closed; and part of the seal covers the gap between the wall body and the door frame, part of the seal covers the gap between the door frame and the door plate, and powder color-changing agents are arranged on the inner side of the seal aligning gap. When the door panel is closed, only the air exhaust pipe is opened, the cavity is evacuated through the air exhaust pipe, then a plurality of seals are fixed at corresponding positions, and the air exhaust pipe is closed; only open the intake pipe, past through the intake pipe inject reactant gas in the cavity, reactant gas can spill over then direct contact powder color-changing agent from the clearance, reactant gas can take place chemical reaction with the powder color-changing agent on the strip of paper used for sealing and make the corresponding position of strip of paper used for sealing change color, reactant gas that the reaction fell can no longer disturb the powder color-changing agent of other positions, maintain the atmospheric pressure of settlement to the time of settlement, the position of gas leakage is judged to the position and the degree of changing color on the inspection strip of paper used for sealing at last, confirm whether the clearance leaks gas and the position of gas leakage.

As an improvement of the scheme, one end of each pipeline is positioned on the back of the wall body, and correspondingly, the air pump and various instruments are arranged on the back of the wall body.

As shown in fig. 1, the containment door of fig. 1 is a simplified schematic diagram, and the specific structure of the containment door can refer to the prior art, and the containment door is installed according to the way of the specification of the containment door. When a certain position on the seal is obviously darker than other positions, the corresponding gap at the position can be considered to be air leakage. When a plurality of samples are tested, if the samples are found to be basically the same or similar to the position of the leakage, the problem of the process or the machine in the production process can be further judged, and the batch of protective airtight doors all need to be repaired or reworked. By adopting the scheme, after the air leakage position is accurately reflected, the problem is further analyzed and solved by the staff conveniently.

As shown in fig. 2, as an improvement of the above scheme, a part of the seal has a U-shaped cross section, non-setting adhesives are disposed at positions, where the left and right ends of the seal are used for connecting the wall or the airtight door, and non-setting adhesives are disposed at positions, where the middle bulge of the seal is used for accommodating the reaction gas. By adopting the scheme, the sealing strip cover can be arranged at the position where the two surfaces are flush, for example, when the door panel is closed, the outer side surface of the door panel is flush with the outer side surface of the door frame, and the sealing strip is used at the position.

As shown in fig. 3, as an improvement of the above scheme, a part of the seal has an L-shaped cross section, non-setting adhesives are disposed at positions where the left and right ends of the seal are used for connecting the wall or the airtight door, and non-setting adhesives are disposed at positions where the reaction gas is contained in the middle of the seal. By adopting the scheme, the sealing strip cover can be arranged on the position with two stepped surfaces, for example, the door frame protrudes out of the surface of the wall body, one end of the sealing strip is lapped on the protruding door frame, and the other end of the sealing strip is lapped on the wall surface at a short position.

As shown in figure 1, because the sealing strips are required to be spliced into a ring shape, as an improvement of the scheme, an angle of 45 degrees is cut between every two adjacent sealing strips, so that the connection is convenient.

As an improvement of the scheme, when the seal is manufactured, the seal is processed into a long strip shape, and the self-adhesive and the protective film thereof are adhered on the inner side; when the seal is used, the seal is cut according to the required length, the protective film of the non-setting adhesive is torn, the powder color-changing agent is coated in the middle position of the seal in situ, the non-setting adhesive is used for fixing the powder color-changing agent, and finally the seal is stuck to the corresponding position. The seal and the powder color-changing agent are stored separately, so that the storage time of the seal and the powder color-changing agent can be prolonged, the powder color-changing agent can be coated quickly by tools such as a brush on the spot, and the use is not influenced.

As an improvement of the above scheme, after the seal is fixed, a sealant is coated on the edge of the seal and the splicing position of two adjacent seals. In some cases (where the pressure in the chamber is not high), grease may be used instead of the sealant. By adopting the scheme, the gap of the whole system can be further blocked.

As an improvement of the above scheme, the seal and the adhesive sticker are both made of transparent materials, for example, the seal is made of transparent PVC materials. By adopting the scheme, when the seal is not detached yet, a worker can visually observe the color change condition of the seal.

As an improvement of the above scheme, the seal is made of an opaque material, and a PC material can be referred to. By adopting the scheme, the staff needs to take off the seal for observation after the test is finished.

As an improvement of the scheme, the wall body is made of high-strength steel. As shown in fig. 1, the wall is only partially shown, and the wall is classified into a large size, a medium size and a small size according to the size of the protective airtight door to be tested. In actual installation, the lower end of the wall body is further provided with a base for increasing the bearing area and clamping and fixing the wall body.

As an improvement of the scheme, the powder color-changing agent is Na₂O₂The reaction gas is CO₂(ii) a Or the powder color-changing agent is FE (OH)₂The reaction gas is O₂(ii) a Or the powder color-changing agent is tea polyphenol, and the reaction gas is O₂. In these examples, the powder color-changing agent also slightly reacts with air after exposure, but according to the operating specification, the powder color-changing agent is taken out and then coated on the seal, and the seal is fixed to the corresponding position, all within minutes, and the powder color-changing agent is not substantially consumed. This trace error does not affect the judgment even if the powder color-changing agent is exposed to air for several minutes, compared to the airtightness test for as long as 24 hours.

Compared with the prior art, the invention has the following beneficial effects: the protective airtight door is judged in a color development mode, and the deeper the color change degree, the closer the position is to the air leakage point, so that the air leakage position can be more accurately reflected, and an operator can conveniently analyze the position. The sealing strip is preloaded with adhesive, so that the powder color-changing agent is conveniently attached to the sealing strip besides the convenience for fixing the sealing strip.

Drawings

FIG. 1 is a block diagram of a lower wall and a containment door according to one embodiment;

FIG. 2 is a structural view of a cross section of a seal in the first embodiment;

fig. 3 is a structural view of a cross section of a seal in the second embodiment.

Description of the main reference numerals: 10. a wall body; 21. a door frame; 22. a door panel; 30. a pipeline; 41. a seal; 42. adhesive sticker; 43. a powder color-changing agent.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present invention.

In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. The terms "first", "second" and "third", if any, are used for descriptive purposes only and for distinguishing between technical features and are not to be construed as indicating or implying relative importance or implying a number of indicated technical features or a precedence of indicated technical features.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "disposed" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. The following describes an embodiment of the present invention based on its overall structure.

Referring to fig. 1 to 3, the present invention discloses a gas leakage detection method, including: the door comprises a wall body 10, a protective airtight door arranged on the front side of the wall body 10 and a plurality of seals 41; the wall body 10 is used as a bearing main body and connected with the protective airtight door, the front surface of the wall body 10 is sunken and a cavity is formed in the inner side of the wall body, at least three pipelines 30 are arranged on the back surface of the wall body 10, the three pipelines 30 are respectively called as an air inlet pipe, an air suction pipe and a detection pipe, the air inlet pipe is communicated with the cavity and an air inlet pump, the air suction pipe is communicated with the cavity and the air suction pump, and the detection pipe is communicated with the cavity and an air pressure detector; the protective airtight door comprises a door frame 21 and a door plate 22, the periphery of the door frame 21 is attached to the wall 10, the door plate 22 is arranged in the door frame 21, and when the door plate 22 is closed, the chamber is covered; a part of the seal 41 covers the gap between the wall 10 and the door frame 21, a part of the seal 41 covers the gap between the door frame 21 and the door panel 22, and a powder color-changing agent 43 is disposed inside the aligned gap of the seal 41. When the door panel 22 is closed, only the air exhaust pipe is opened, the chamber is evacuated through the air exhaust pipe, then a plurality of seals 41 are fixed at corresponding positions, and the air exhaust pipe is closed; only open the intake pipe, past through the intake pipe inject reactant gas in the cavity, reactant gas can spill over then direct contact powder color-changing agent 43 from the clearance, reactant gas can take place chemical reaction with powder color-changing agent 43 on the strip of paper used for sealing 41 and make the corresponding position of strip of paper used for sealing 41 change color, reactant gas that the reaction fell can no longer disturb the powder color-changing agent 43 of other positions, maintain the atmospheric pressure of settlement to the time of settlement, the position of gas leakage is judged to the position and the degree of checking the last discoloration of strip of paper used for sealing 41 at last, confirm whether the clearance leaks gas and the position of gas leakage.

As an improvement of the above scheme, one end of each pipeline 30 is located on the back of the wall 10, and accordingly, the air pump and various instruments are arranged on the back of the wall 10.

As shown in fig. 1, the containment door of fig. 1 is a simplified schematic diagram, and the specific structure of the containment door can refer to the prior art, and the containment door is installed according to the way of the specification of the containment door. When a certain place on the seal 41 is obviously darker than other places, the corresponding gap at the place can be considered to be air leakage. When a plurality of samples are tested, if the samples are found to be basically the same or similar to the position of the leakage, the problem of the process or the machine in the production process can be further judged, and the batch of protective airtight doors all need to be repaired or reworked. By adopting the scheme, after the air leakage position is accurately reflected, the problem is further analyzed and solved by the staff conveniently.

As shown in fig. 2, as an improvement of the above scheme, a cross section of a part of the seal 41 is U-shaped, self-adhesive tapes 42 are disposed at positions where left and right ends of the seal 41 are used for connecting the wall 10 or the airtight door, and the self-adhesive tapes 42 are disposed at positions where a middle bulge of the seal 41 is used for containing reaction gas. With the above arrangement, the seal 41 can be covered at a position where the two surfaces are flush with each other, for example, when the door panel 22 is closed, the outer side surface of the door panel 22 is flush with the outer side surface of the door frame 21, and the seal 41 is used at the position.

As shown in fig. 3, as an improvement of the above scheme, a cross section of a part of the seal 41 is L-shaped, non-setting adhesive 42 is disposed at a position where the left and right ends of the seal 41 are used for connecting the wall 10 or the airtight door, and non-setting adhesive 42 is disposed at a position where the middle of the seal 41 receives the reaction gas. By adopting the above scheme, the seal 41 can be covered on the position with two stepped surfaces, for example, the door frame 21 protrudes from the surface of the wall 10, and at this time, one end of the seal 41 is lapped on the protruding door frame 21, and the other end is lapped on the wall surface at a short place.

As shown in fig. 1, because the seal 41 needs to be spliced into a ring, as an improvement of the above scheme, an angle of 45 ° is cut between two adjacent seals 41, which facilitates the connection.

As an improvement of the above scheme, when the seal 41 is manufactured, the seal 41 is processed into a long strip shape, and the self-adhesive 42 and the protective film thereof are adhered on the inner side; when the seal 41 is used, the seal 41 is cut according to a desired length, a protective film of the sticker 42 is torn, a powder color-changing agent 43 is coated on the middle position of the seal 41 on the spot, the powder color-changing agent 43 is fixed by the sticker 42, and finally the seal 41 is stuck to the corresponding position. The seal 41 and the powder color-changing agent 43 are stored separately, which is beneficial to prolonging the storage time of the two, and the powder color-changing agent 43 can be coated quickly by a tool such as a brush on the spot, thus the use is not influenced at all.

As an improvement of the above scheme, after the seal 41 is fixed, a sealant is applied to the edge of the seal 41 and the joint between two adjacent seals 41. In some cases (where the pressure in the chamber is not high), grease may be used instead of the sealant. By adopting the scheme, the gap of the whole system can be further blocked.

As an improvement of the above scheme, the seal 41 and the adhesive sticker 42 are both made of transparent materials, for example, the seal 41 is made of transparent PVC materials. By adopting the scheme, when the seal 41 is not detached, a worker can visually observe the color change condition of the seal 41.

As a modification of the above solution, the seal 41 is made of opaque material, and PC material can be referred to. With the above scheme, the worker needs to take off the seal 41 for observation after the test is finished.

As an improvement of the above scheme, the wall body 10 is made of high-strength steel. As shown in fig. 1, the wall 10 is only partially shown, and the wall 10 is classified into various sizes according to the size of the airtight door to be tested. In actual installation, the lower end of the wall 10 is further provided with a base for increasing the bearing area and clamping and fixing the wall 10.

As an improvement of the above scheme, the powder color-changing agent 43 is Na₂O₂The reaction gas is CO₂(ii) a Or the powder color-changing agent 43 is FE (OH)₂The reaction gas is O₂(ii) a Or the powder color-changing agent 43 is tea polyphenol, and the reaction gas is O₂. In these examples, the powder color-changing agent 43 also slightly reacts with air after exposure, but according to the operating specification, the powder color-changing agent 43 is taken out and coated on the seal 41, and the seal 41 is fixed to the corresponding position, and the time is within several minutes, and the powder color-changing agent 43 is not substantially consumed. This minute amount of error does not affect the judgment even if the powder color-changing agent 43 is exposed to air for several minutes, compared to the airtightness test for as long as 24 hours.

The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.