JP6644615B2 - Airtightness evaluation device and airtightness evaluation method - Google Patents

Description

  The present invention relates to an airtightness evaluation device and an airtightness evaluation method for evaluating the degree of airtightness of an object to be measured.

  2. Description of the Related Art Conventionally, Japanese Industrial Standards (JIS A 2201: 2003, “Airtightness test of houses and the like using a blower”) has been described for a method of evaluating the degree of airtightness of a general house, a factory, a clean room, and the like (hereinafter, referred to as “measured object”). Method)), and various airtightness evaluation devices for implementing the method have been proposed (for example, see Patent Documents 1, 2, and 3).

  Incidentally, there is a case where it is desired to locally evaluate the airtightness of a part of the object to be measured, instead of evaluating the airtightness of the entire object already constructed. For example, there is a case where airtightness data of gaps between doors and windows of a building is measured in advance, and it is desired to refer to the design stage when constructing a new building.

  FIG. 4A is a cross-sectional view showing an example of a state in which the local airtightness of the measured object is measured using such an airtightness evaluation device. Reference numeral D3 indicates the measured object, and reference numeral H3. Denotes a gap (hole) formed so as to penetrate the front and back of the measured object D3, and the symbol C3 defines a substantially sealed space A3 between the measured object D3 and the measured object D3. Shows a chamber which is brought into close contact with the surface of the measured object D3, and reference numeral 2C denotes an intake means for sucking air in the space A3. In such an apparatus, the local airtightness can be obtained by calculation by measuring the air volume from the space A3 when the air intake means 2C is driven.

JP-A-4-145339 JP 2001-91397 A JP 2002-228537 A

  Meanwhile, in the case of the measured object D3 as illustrated in FIG. 4A, the air M sucked from the back side (the lower side in the figure) of the measured object D3 is sucked into the space A3 as it is. Therefore, the airtightness can be accurately evaluated. However, in the case of the measured object D4 as illustrated in FIG. 4B, since the gap H4 is complicatedly branched, the measured object Not only the air M sucked from the back side of D4 (the lower side in the figure) but also the air N from the side is sucked into the space A3, and the air N from the side becomes a noise component, and the airtightness Cannot be evaluated accurately. That is, according to the method illustrated in FIGS. 4A and 4B, the evaluation of the airtightness is affected by the shape of the gap portion of the measured object, and the airtightness cannot be accurately measured or measured. There was a problem that

  An object of the present invention is to provide an airtightness evaluation device and an airtightness evaluation method that can solve the above-described problems.

A first aspect of the present invention is illustrated in FIGS. 1 and 2A and 2B, and is a hermeticity evaluation device (1, 1) that evaluates the degree of hermeticity of a measured object (D1, D2). 11)
A part of the surface (the upper surface in the figure) of the object to be measured (D1, D2), which is substantially sealed with the object to be measured (D1, D2) by being in close contact with a part (E1) where the degree of airtightness is to be evaluated. A substantially bowl-shaped first chamber (C11, C21) forming a closed first space (A1);
A hole or a gap portion (symbol H1 in FIG. 1 and FIG. 2A) is a part of the surface of the measured object (D1, D2) and penetrates the measured object (D1, D2). b) A substantially bowl-shaped second space (A2) is formed in close contact with the measured object (D1, D2) by closely adhering to the portion (E2) where the H2) is formed. 2 chambers (C12, C22),
At least one intake means (2A, 2B) connected to the first enclosed space (A1) and the second enclosed space (A2) so as to suck air from the first enclosed space (A1) and the second enclosed space (A2);
A pressure difference between chambers (ΔPC) which is a pressure difference between a first pressure (P1) which is a pressure of the first closed space (A1) and a second pressure (P2) which is a pressure of the second closed space (A2). Inter-chamber differential pressure acquisition means (3) for acquiring pressure;
The air volume of air sucked from the first closed space (A1) by the suction means (2A) so that the inter-chamber differential pressure (ΔPC) obtained by the inter-chamber differential pressure obtaining means (3) becomes substantially zero. And / or an air volume adjusting means (4) for adjusting the air volume of air sucked from the second enclosed space (A2) by the air intake means (2B);
A front-back differential pressure (ΔP) which is a differential pressure between the pressure (P3) on the back surface side (the lower side in the figure and indicated by reference numeral A3) of the measured object (D1, D2) and the first pressure (P1). Front and back differential pressure acquisition means (5) for acquiring
An air volume measuring unit (6) for measuring an air volume (Q) of air sucked from the first enclosed space (A1) by the air intake unit (2A);
The value of αA is obtained from the front and back differential pressure (ΔP) obtained by the front and back differential pressure obtaining means (5), the air flow (Q) measured by the air flow measuring means (6), and the following equations (1) and (2). Computing means (7) for computing
With
It is characterized in that the degree of airtightness is evaluated based on the value of αA calculated by the calculating means (7).

  A second aspect of the present invention is illustrated in FIG. 1, wherein the second chamber (C12) is larger than the first chamber (C11) and surrounds the first chamber (C11). It is characterized by being arranged in.

According to a third aspect of the present invention, there is provided an airtightness evaluation method for evaluating a degree of airtightness of a measured object (D1, D2),
A substantially bowl-shaped first chamber (C11, C21) is brought into close contact with a part (E1) of the surface of the object to be measured (D1, D2) where the degree of airtightness is to be evaluated. D1, D2) to form a substantially hermetically sealed first enclosed space (A1);
A substantially bowl-shaped second chamber (C12, C22) is brought into close contact with a part (E2) of the surface of the measured object (D1, D2) to form a second chamber substantially sealed with the measured object (D1, D2). (2) forming a closed space (A2);
Connecting at least one intake means (2A, 2B) to the first enclosed space (A1) and the second enclosed space (A2) so as to suck air in the second enclosed space (A2);
A pressure difference between chambers (ΔPC) which is a pressure difference between a first pressure (P1) which is a pressure of the first closed space (A1) and a second pressure (P2) which is a pressure of the second closed space (A2). The step of obtaining
The air volume of the air sucked from the first closed space (A1) by the suction means (2A) and / or the air volume of the air suctioned by the suction means (2B) so that the acquired inter-chamber differential pressure (ΔPC) becomes substantially zero. Adjusting the air volume of the air sucked from the second closed space (A2);
Obtaining a front-back differential pressure (ΔP) that is a differential pressure between a pressure (P3) on the back surface side of the measured object (D1, D2) and the first pressure (P1);
A step of measuring an air volume (Q) of air sucked from the first closed space (A1) by the intake means (2A, 2B);
Calculating a value of αA from the front-back differential pressure (ΔP), the air volume (Q), and the following equations (1) and (2):
With
The degree of airtightness is evaluated by the calculated value of αA.

  A fourth aspect of the present invention is characterized in that the second chamber (C12) is arranged to be larger than the first chamber (C11) and to surround the first chamber (C11).

  According to a fifth aspect of the present invention, the second chamber (C12, C22) is a part of the surface of the measured object (D1, D2) and penetrates the measured object (D1, D2). And a portion (E2) in which a hole or gap (see reference numeral H1 in FIG. 1 and reference numeral H2 in FIGS. 2A and 2B) is formed.

A sixth aspect of the present invention is illustrated in FIGS. 2 (a) and 2 (b), wherein the first chamber (C21) is formed so as to penetrate the front and back of the measured object (D2). Arranged so as to cover a part (E1) of the slit-shaped gap (H2),
The second chamber (C22) is arranged so as to cover another portion (E2) of the gap (H2) while being adjacent to the first chamber (C21).

  Note that the numbers in parentheses are for convenience showing the corresponding elements in the drawings, and therefore, the description is not limited to the description on the drawings.

  According to the above-described first to sixth aspects, the air that is going to flow into the area other than the area where the airtightness is to be evaluated (through the gap inside the measured object) passes through the gap and the second air flows through the gap. It will be sucked to the side of the chamber and will not be sucked to the side of the first chamber. As a result, local airtightness can be accurately evaluated.

FIG. 1 is a cross-sectional view illustrating an example of the configuration of the airtightness evaluation device according to the present invention. FIG. 2A is a plan view illustrating another example of the configuration of the airtightness evaluation device according to the present invention, and FIG. 2B is a cross-sectional view taken along the line KK. FIGS. 3A and 3B are cross-sectional views for explaining the effect of the present invention. FIG. 4A is a cross-sectional view showing an example of measuring the local airtightness of the measured object using a conventional airtightness evaluation device, and FIG. 4B shows the problem. FIG.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS.

  The airtightness evaluation device according to the present invention can locally evaluate the degree of airtightness of an object to be measured. The airtightness evaluation device according to the present invention is exemplified by reference numerals 1 and 11 in FIGS. 1 and 2A and 2B and includes at least two substantially bowl-shaped chambers (reference numerals C11 and C11). C12, and C21 and C22). These chambers C11, C12, C21, and C22 have openings, and the edges of the openings are shaped so that they can be in close contact with the object to be measured (reference numerals D1 and D2). When the edges of the opening are brought into close contact with the measured objects D1 and D2, substantially closed closed spaces A1 and A2 are formed together with the measured objects D1 and D2. Note that these chambers C11, C12, C21, and C22 do not necessarily need to be formed in a bowl shape (cup shape) with a curved surface, and in at least three or more substantially flat surfaces into a substantially pyramid shape or a substantially box shape. It may be formed. One of the chambers (hereinafter, referred to as “first chamber”) C11 and C21 is a part E1 of the surface (upper surface in the drawing) of the measured objects D1 and D2 where the degree of airtightness is to be evaluated. To form a first hermetically sealed space A1 which is substantially sealed together with the measured objects D1 and D2, and the other chambers (hereinafter referred to as "second chambers") C12 and C22 A hole or a gap portion (reference numeral H1 in FIG. 1 and reference numeral H2 in FIGS. 2A and 2B) is a part of the surface of the measured objects D1 and D2 and penetrates the measured objects D1 and D2. (See FIG. 3) is formed so as to form a second hermetically sealed second space A2 together with the measured objects D1 and D2.

And the airtightness evaluation devices 1 and 11 according to the present invention
Air in the first closed space A1 formed by the first chambers C11 and C21 and the objects D1 and D2; and air formed by the second chambers C12 and C22 and the objects D1 and D2. Air in the second enclosed space A2,
Suction means (so-called blowers) 2A and 2B for sucking air. In the example shown in FIGS. 1 and 2A and 2B, two intake units 2A and 2B are arranged, and the first closed space A1 and the second closed space A2 are separated from each other by separate intake units. However, the present invention is not limited to this, and the air in both the closed spaces A1 and A2 may be sucked by one suction unit. In this case, the amount of intake air is preferably adjusted by a throttle valve interposed between the closed spaces A1, A2 and the intake means. Further, a device provided with three or more intake means is not excluded from the scope of the present invention. That is, in the present invention, at least one intake means connected to (communicated with) the first closed space A1 and the second closed space A2 is provided so as to suck air from the first closed space A1 and the second closed space A2. Just do it. Further, in the examples shown in FIGS. 1 and 2 (a) and 2 (b), each intake means 2A, 2B is connected to each of the chambers C11, C21, C12, C22, but is communicated with the closed spaces 2A, 2B. Of course, it is not limited to this as long as it has a structure
The intake passages from the intake means 2A, 2B may be arranged between the chambers C11, C21, C12, C22 and the objects D1, D2 and open to the closed spaces A1, A2. Or
The intake passages from the intake means 2A, 2B are also arranged inside the measured objects D1, D2, and open from the sides of the measured objects D1, D2 to the closed spaces A1, A2.
both are fine.

On the other hand, the airtightness evaluation devices 1 and 11 according to the present invention are provided with an air pressure (hereinafter referred to as “first air pressure”) P1 of the first enclosed space A1 and an air pressure (hereinafter “second air pressure”) of the second enclosed space A2. An inter-chamber differential pressure acquiring unit 3 for acquiring a differential pressure ΔPC from the pressure P2 (hereinafter referred to as “inter-chamber differential pressure”) P2 is provided. In this case, the pressure difference between the chambers may be obtained by directly measuring the pressure difference ΔPC between the chambers using a commercially available differential pressure measuring device as the means for obtaining the pressure difference between the chambers 3. Means 3
A barometer (not shown) for measuring the first pressure P1;
A barometer (not shown) for measuring the second pressure P2;
An inter-chamber differential pressure calculating means (not shown) for calculating a differential pressure between the first air pressure and the second air pressure based on the measured values of these barometers;
To obtain the inter-chamber differential pressure ΔPC by measurement and calculation.

In addition, the airtightness evaluation devices 1 and 11 according to the present invention include the first chambers C11 and C21 on the back side of the measured objects D1 and D2 (the portion indicated by reference numeral A3 and the lower side in the drawing). And a pressure difference (hereinafter referred to as “front and back pressure difference”) between the pressure P3 on the side where the second chambers C12 and C22 are not in close contact (hereinafter referred to as “backside pressure”) and the first pressure P1. Is provided. The same applies to this case, and the pressure difference may be obtained by directly measuring the front-back differential pressure ΔP by using a commercially available differential pressure measuring device for the front-back differential pressure obtaining means 5. Pressure acquisition means 5
A barometer (not shown) for measuring the first pressure P1;
A barometer (not shown) for measuring the back side pressure P3;
Front and back pressure difference calculating means (not shown) for calculating a pressure difference between the first pressure and the back pressure based on the measured values of these barometers;
To obtain the front-back differential pressure ΔP by measurement and calculation.

On the other hand, the airtightness evaluation devices 1 and 11 according to the present invention are arranged so that the inter-chamber differential pressure ΔPC acquired by the inter-chamber differential pressure acquisition means 3 becomes substantially zero.
(1) Air volume of air sucked from the first closed space A1 by the air intake unit 2A, or (2) Air volume of air sucked from the second closed space A2 by the air suction unit 2B, or
(3) An air volume adjusting means 4 capable of adjusting either of the air volumes of (1) and (2) is provided.

  Further, the airtightness evaluation devices 1 and 11 according to the present invention include an air volume measuring unit 6 that measures an air volume Q of air sucked from the first closed space A1 by the air intake unit 2A.

Further, the airtightness evaluation devices 1 and 11 according to the present invention use the front and back differential pressure ΔP acquired by the front and back differential pressure acquisition unit 5 and the air volume Q measured by the air volume measurement unit 6 with the following equations (1) and ( 2) calculating means for calculating the value of αA from the above, and the degree of airtightness is evaluated based on the value of αA calculated by the calculating means 7.

  Here, a specific calculation method of the equivalent gap area αA will be described.

While changing the amount of intake air by operating the intake means 2A and 2B, at least three sets of values of ΔP and Q are actually measured (acquired). For example, three front-back differential pressures ΔP ₁ , ΔP ₂ , ΔP ₃ and three air volumes Q ₁ , Q ₂ , Q ₃ are obtained by actual measurement. By substituting these values into the above equation (1) and using, for example, the least squares method, the values of the above a and n are obtained. On the other hand, ρ is the air density, which can be obtained from the temperature t at the time of measurement and the following equation (3). For example, when the temperature is 20 ° C., the value of ρ is about 1.2 (kg / m ³ ).

The following equation (4) can be obtained from the above equations (1) and (2). In this equation, the values of a, n, and ρ are known as described above, and ΔP is 9.8. (Pa), the value of αA is determined.

  According to the present invention, the air that is going to flow into the area other than the area where the airtightness is to be evaluated (through the gap inside the measured object D1) passes through the gap H1 on the side of the second chamber C12. And is not sucked into the first chamber C11 side. As a result, local airtightness can be accurately evaluated. For example, in the case of the specimens D3 and D4 as illustrated in FIGS. 3A and 3B, air from the lower side is sucked into the chamber as it is, and air from areas other than the area where the airtightness is to be evaluated is removed. The air is not sucked into the first chamber C21, and as a result, the local airtightness can be accurately evaluated.

  Meanwhile, the second chamber C12 illustrated in FIG. 1 is arranged so as to be larger than the first chamber C12 and surround the first chamber C11 (that is, the first chamber C11 and the second chamber C12). Are arranged so as to form a double), but the present invention is not limited to this, and the first chamber C21 and the second chamber C22 are adjacent to each other as illustrated in FIGS. 2A and 2B. It may be arranged as follows. Further, in the example shown in FIG. 1, the number of the first chambers C11 arranged inside the second chamber C12 is one. However, the number of the first chambers C11 is not limited thereto. good.

On the other hand, the airtightness evaluation method according to the present invention is for evaluating the degree of airtightness of the measured objects D1 and D2,
A substantially bowl-shaped first chamber C11, C21 is brought into close contact with a part E1 of the surface of the measured objects D1, D2 where the degree of airtightness is to be evaluated, thereby substantially sealing with the measured objects D1, D2. Forming a closed first closed space A1;
The second chambers C12 and C22, which are substantially bowl-shaped, are brought into close contact with a part E2 of the surface of the measured objects D1 and D2 to form a substantially closed second sealed space A2 together with the measured objects D1 and D2. Process and
Connecting at least one intake means 2A, 2B to the first enclosed space A1 and the second enclosed space A2 so as to suck air in the first enclosed space A1 and the second enclosed space A2;
A step of obtaining an inter-chamber differential pressure ΔPC which is a pressure difference between a first pressure P1 which is the pressure of the first closed space A1 and a second pressure P2 which is a pressure of the second closed space A2;
The amount of air sucked from the first closed space A1 by the suction means 2A and / or the second closed space A2 by the suction means 2B so that the acquired pressure difference ΔPC between the chambers becomes substantially zero. Adjusting the air volume of the air to be sucked;
A step of obtaining a front-back differential pressure ΔP, which is a differential pressure between the pressure P3 of the back surface A3 of the measured objects D1 and D2 and the first pressure P1;
A step of measuring an air volume Q of the air sucked from the first closed space A1 by the suction unit 2A;
A step of calculating a value of αA from the front-back differential pressure ΔP, the air volume Q, and the following equations (1) and (2);
And the degree of airtightness is evaluated based on the calculated value of αA.

  According to the present invention, the air that is going to flow into the area other than the area where the airtightness is to be evaluated (through the gap inside the measured object D1) passes through the gap H1 on the side of the second chamber C12. And is not sucked into the first chamber C11 side. As a result, local airtightness can be accurately evaluated.

  In this case, as illustrated in FIG. 1, the second chamber C12 is preferably larger than the first chamber C11 so as to surround the first chamber C11.

  Further, the second chambers C12 and C22 are holes or gaps (reference numerals H1 and H1 in FIG. 1) that are part of the surfaces of the measurement objects D1 and D2 and penetrate the measurement objects D1 and D2. 2 (a) and 2 (b) (refer to reference numeral H2).

  Further, as exemplified in FIGS. 2A and 2B, the first chamber C21 covers a part E1 of a slit-shaped gap H2 formed so as to penetrate the front and back of the measured object D2. It is preferable that the second chamber C22 is arranged so as to cover another portion E2 of the gap H2 in a state of being adjacent to the first chamber C21. Examples of such a slit-shaped gap H2 include a gap between a door, a window, and a rag.

DESCRIPTION OF SYMBOLS 1 Airtightness evaluation apparatus 2A, 2B Intake means 3 Inter-chamber differential pressure acquisition means 4 Air volume adjustment means 5 Front and back differential pressure acquisition means 6 Air volume measurement means 7 Calculation means 11 Airtightness evaluation apparatus A1 First enclosed space A2 Second enclosed space A3 Back side C11 of measurement object C1 first chamber C12 second chamber C21 first chamber C22 second chamber D1 measurement object D2 measurement object H1 hole or gap H2 slit-shaped gap P1 first pressure P2 second pressure P3 Air pressure ΔP on the back side of the measured object Differential pressure between front and back ΔPC Differential pressure between chambers

Claims (6)

In an airtightness evaluation device for evaluating the degree of airtightness of the measured object,
A substantially bowl-shaped first chamber that forms a first sealed space that is substantially sealed together with the measured object by being in close contact with a part of the surface of the measured object and a portion where the degree of airtightness is to be evaluated;
A second closed space substantially sealed with the measured object by being in close contact with a part of the surface of the measured object and having a hole or a gap formed through the measured object; A substantially bowl-shaped second chamber forming
At least one intake means coupled to the first enclosed space and the second enclosed space so as to suck air in the second enclosed space;
An inter-chamber differential pressure acquiring means for acquiring an inter-chamber differential pressure which is a differential pressure between a first atmospheric pressure which is an atmospheric pressure of the first enclosed space and a second atmospheric pressure which is an atmospheric pressure of the second enclosed space,
The air volume of the air sucked from the first closed space by the suction means and / or the second closed space by the suction means so that the inter-chamber differential pressure acquired by the inter-chamber differential pressure acquisition means becomes substantially zero. Air volume adjusting means for adjusting the air volume of air sucked from the
Front and back differential pressure obtaining means for obtaining a front and back differential pressure which is a differential pressure between the pressure on the back side of the measured object and the first air pressure,
Air volume measuring means for measuring an air volume of air sucked from the first closed space by the air intake means;
Comprising arithmetic means for calculating the degree of airtightness of the object to be measured based on the front and back differential pressure acquired by the front and back differential pressure acquisition means and the airflow measured by the airflow measurement means,
An airtightness evaluation device, characterized in that: The second chamber is larger than the first chamber and is arranged to surround the first chamber.
The airtightness evaluation device according to claim 1, wherein: In the airtightness evaluation method for evaluating the degree of airtightness of the measured object,
Forming a substantially closed first sealed space together with the measured object by adhering a substantially bowl-shaped first chamber to a part of the surface of the measured object and a portion where the degree of airtightness is to be evaluated; ,
Forming a substantially closed second sealed space together with the measured object by bringing a substantially bowl-shaped second chamber into close contact with a part of the surface of the measured object;
Coupling at least one intake means to the first enclosed space and the second enclosed space so as to suck air in the second enclosed space;
Obtaining a differential pressure between chambers, which is a differential pressure between a first atmospheric pressure, which is an atmospheric pressure of the first enclosed space, and a second atmospheric pressure, which is an atmospheric pressure of the second enclosed space,
The air volume of the air sucked from the first closed space by the suction unit and / or the air volume of the air sucked from the second closed space by the suction unit so that the acquired pressure difference between the chambers becomes substantially zero. Adjusting,
A step of obtaining a front-back differential pressure that is a differential pressure between a pressure on the back surface side of the measured object and the first pressure;
Measuring the air volume of the air sucked from the first enclosed space by the suction means;
Computing and evaluating the degree of airtightness of the measured object based on the front-back differential pressure and the air volume,
An airtightness evaluation method characterized in that: The second chamber is arranged to be larger than the first chamber and surround the first chamber.
The airtightness evaluation method according to claim 3, wherein: The second chamber is in close contact with a part of a surface of the measured object, in which a hole or a gap is formed to penetrate the measured object,
The airtightness evaluation method according to claim 3, wherein: The first chamber is disposed so as to cover a part of a slit-shaped gap formed to penetrate the front and back of the measured object,
The second chamber is disposed so as to cover another portion of the gap in a state adjacent to the first chamber.
The airtightness evaluation method according to claim 5, wherein:

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