JP2012002524A - Air-tightness test method of chemical protective clothing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air-tightness test method for an air-supply-type air-tight clothing that is a chemical protective clothing without requiring a disassembly and repair of an exhaust valve.SOLUTION: A cover of an exhaust valve of an air-supply-type air-tight clothing is removed, and a lid member is attached to the exhaust valve. Air is supplied from an air-supply source through an air-supply hose connected to an air-supply port into the inside of the clothing while measuring an inner pressure of a space between a valve body of the exhaust valve and the lid member. The air is supplied to apply pressure to the inside of the clothing until the inner pressure of the space between the valve body of the exhaust valve and the lid member reaches a predetermined value. The inner pressure of the air-supply hose is measured at a time when a predetermined time is passed after halting the air supply.

Description

The present invention relates to a method for airtight testing chemical protective clothing.

Chemical protective clothing worn on the human body to prevent the liquid, gas, solid powder, etc. harmful to the human body from adhering to the human body and suction by the human body are classified into airtight clothing and sealed clothing according to JIS T8115. For the above airtight clothing, the airtightness test specified in JIS T8032 is JIS
Mandatory by T8115.
JIS T8115 classifies airtight clothing into three types. The air-feeding airtight clothing, which is one of the three types, supplies air that can be breathed from outside the clothing into the clothing with an air-feeding hose, and has an air-feeding port and an exhaust port. . An air supply hose connecting member is attached to the air supply opening, and an exhaust valve is attached to the exhaust opening.
Conventionally, in the airtight test of the air supply type airtight clothing, the exhaust valve is disassembled and removed, leaving only the exhaust valve housing cylinder, the lid member is attached to the exhaust valve housing cylinder, and the air supply hose is fed from the external air supply source. Air is fed into the clothing through the air hose connecting member, the inside of the clothing is pressurized to a predetermined pressure specified in JIS T8032, and after the air supply is stopped, the internal pressure at the elapse of a predetermined time specified in JIS T8032 is It was led to a pressure gauge through a pressure hose penetrating the lid member and measured.

The conventional airtightness test method for airtight airtight clothing requires disassembly and restoration of the exhaust valve, which is the part related to airtightness of the airtight airtight clothing. There was a problem that the airtightness of the airtight clothing was sometimes impaired.
The present invention has been made in view of the above problems, and provides an airtight test method for an air-feeding airtight clothing that is a chemical protective clothing, and does not require disassembly and recovery of the exhaust valve. With the goal.

In order to solve the above-mentioned problems, in the present invention, the cover of the exhaust valve of the air-tight airtight clothing that is a chemical protective suit is removed and the cover member is attached to the exhaust valve, The internal pressure of the space between the valve body of the exhaust valve and the lid member is measured by measuring the internal pressure of the space between the air supply source through the air supply hose connected to the air supply port. Provided is a chemical protective clothing airtightness test method characterized in that the inside of a clothing is pressurized until a predetermined value is reached, and the internal pressure of the air feeding hose is measured when a predetermined time elapses after the air feeding is stopped.
If the airtight test is performed by measuring the internal pressure of the air supply hose, the exhaust valve need not be disassembled and restored. However, during the air supply, the internal pressure of the air supply hose becomes higher than the internal pressure of the airtight clothing due to the pressure loss generated by the air supply hose connecting member. Therefore, when air is supplied while measuring the internal pressure of the air supply hose, it cannot be confirmed that the internal pressure of the airtight clothing has increased to a predetermined pressure defined in JIS T8032. On the other hand, since the opening pressure of the exhaust valve is very small, the exhaust valve repeats the on-off valve until the airtight clothing internal pressure reaches the predetermined value specified in JIS T8032, and when the airtight clothing internal pressure reaches the predetermined pressure, The internal pressure of the space between the lid member is equal to or lower than the airtight clothing internal pressure and equal to or higher than the pressure obtained by subtracting the valve opening pressure of the exhaust valve from the airtight clothing internal pressure. JIS
The predetermined pressure specified by T8032 has a width in the vertical direction, and the opening pressure of the exhaust valve is less than the vertical width of the predetermined pressure, so the internal pressure of the space between the exhaust valve and the lid member and the opening of the exhaust valve If the air supply is stopped when the sum of the pressure reaches the upper limit of the vertical width, the internal pressure of the air supply type airtight clothing when the air supply is stopped is
It fits within the vertical width of the specified pressure specified by T8032.
After the air supply is stopped, the air flow in the air supply hose connecting member stops, the pressure loss of the air supply hose connecting member becomes zero, and the air supply hose internal pressure becomes the same as the airtight clothing internal pressure. Accordingly, if the internal pressure of the air supply hose is measured when a predetermined time has elapsed after the air supply is stopped, the airtight test specified in JIS T8032 is carried out.
In the present invention, the internal pressure of the air supply hose connected to the air supply port is measured to measure the internal pressure of the airtight clothing after the air supply is stopped, so the exhaust valve needs to be restored only by removing the cover. No. Therefore, there is no possibility that the airtightness of the protective clothing will be impaired by the airtightness test.

It is an external view of the air supply type airtight clothing which is a chemical protective clothing. (A) is a front view, (b) is a rear view. It is sectional drawing of the exhaust valve attached to the air supply type airtight clothing of FIG. It is an external appearance perspective view of an exhaust valve in the state where a cover was removed. It is sectional drawing of the cover member with which the exhaust valve which removed the cover is mounted | worn. It is an external appearance perspective view of the exhaust valve and cover member which show the attachment procedure of a cover member. It is an external appearance perspective view of the exhaust valve and lid member after lid member mounting.

An airtight test method for a chemical protective suit according to an embodiment of the present invention will be described.
As shown in FIG. 1, an air supply type airtight clothing 1 that is a chemical protective clothing includes an airtight clothing body 2, an air supply hose connection member 3, and an exhaust valve 4.
The air supply hose connecting member 3 is a cylindrical body that is fitted and fixed to an air supply port 2 a formed in the left thigh portion of the airtight clothing main body 2 and extends along the left thigh portion.
As shown in FIGS. 2 and 3, the exhaust valve 4 is fitted and fixed to an exhaust port 2 b formed in the rear head of the airtight clothing body 2, and an exhaust valve housing cylinder 4 a in which a valve seat is formed, and an exhaust valve housing A valve body 4b accommodated in the cylinder 4a, a spring 4c for applying a predetermined valve opening pressure to the valve body 4b, and a spring presser 4d fixed to the exhaust valve accommodation cylinder 4a are provided. An exhaust valve cover 5 elastically engaged with the spring retainer 4d covers the exhaust valve 4 and protects the exhaust valve 4.
As shown in FIGS. 4 to 6, the lid member 6 attached to the exhaust valve 4 instead of the exhaust valve cover 5 during the airtight test has an annular peripheral edge abutting against the annular peripheral edge of the spring retainer 4 d and the valve of the exhaust valve. A bowl-shaped rubber packing 6a that forms a pressure measurement space α with the main body 4b, and a bowl-shaped packing made of hard resin that accommodates the rubber packing 6a and whose annular peripheral edge abuts against the annular peripheral edge of the rubber packing 6a A half-split-like lid member cover 6c that accommodates the presser 6b, the packing presser 6b, and the inner flange portion 6c 'can be engaged with a groove 4d' formed on the outer peripheral side surface of the annular peripheral portion of the spring presser 4d; And a pressing screw 6d that is screwed into the lid member cover 6c. One end of the pressure guiding hose 7 passes through the packing presser 6b and the rubber packing 6a and is fixed to the packing presser 6b.

In the airtight test of the air-feeding airtight clothing 1, the exhaust valve cover 5 is removed from the exhaust valve 4 as shown in FIG. As shown in FIGS. 4 to 6, the rubber packing 6a and the packing retainer 6b assembled together are put on the spring retainer 4d of the exhaust valve 4, and the annular peripheral edge of the rubber packing 6a is brought into contact with the annular peripheral edge of the spring retainer 4d. Let The cover member cover 6c is attached to the spring retainer 4d from the side while engaging the inner flange 6c 'with the groove 4d', the pressing screw 6d is screwed into the cover member cover 6c, and the packing retainer 6b is pressed at the tip of the screw. Then, the annular peripheral edge of the packing retainer 6b is pressed against the annular peripheral edge of the rubber packing 6a. As a result, the annular peripheral edge of the rubber packing 6a is pressed against the annular peripheral edge of the spring retainer 4d, and the contact portion between the annular peripheral edge of the rubber packing 6a and the annular peripheral edge of the spring retainer 4d is sealed.
A first pressure gauge (not shown) is attached to the other end of the pressure guiding hose 7.
As shown in FIG. 1, one end of an air supply hose 8 is connected to the air supply hose connection member 3, and the other end of the air supply hose 8 is connected to a pressurized air supply source (not shown) and is branched from the air supply hose 8. The pressure guiding hose 9 to be connected is connected to a second pressure gauge (not shown).

The internal pressure of the pressure measurement space α between the valve body 4b of the exhaust valve 4 and the rubber packing 6a is supplied while supplying pressurized air from the pressurized air supply source to the air-feeding airtight clothing 1 through the air-feeding hose 8. Then, it is guided to the first pressure gauge via the pressure guiding hose 7 and measured. The internal pressure of the pressure measurement space α is equal to or lower than the internal pressure of the air-feeding airtight clothing 1 and equal to or higher than the pressure obtained by subtracting the valve opening pressure of the exhaust valve 4 from the internal pressure of the air-feeding airtight clothing 1.
Air supply is stopped when the sum of the internal pressure of the pressure measurement space α and the known valve opening pressure of the exhaust valve 4 reaches the upper limit of the upper and lower width of the predetermined pressure defined in JIS T8032. The opening pressure of the exhaust valve 4 is JIS
Since it is less than the vertical width of the predetermined pressure specified in T8032, the internal pressure of the air-feeding airtight clothing 1 when the air supply is stopped falls within the vertical width of the predetermined pressure specified in JIS T8032.

By stopping the air supply, the air flow in the air supply hose connection member 3 is stopped, and the pressure loss generated in the air supply hose connection member 3 becomes zero. As a result, the internal pressure of the air supply hose 8 becomes the same as the internal pressure of the air supply type airtight clothing 1.
After the air supply is stopped, the internal pressure of the air supply hose 8 when a predetermined time stipulated in JIS T8032 has elapsed is guided to the second pressure gauge via the pressure guiding hose 9 and measured. Since the internal pressure of the air supply hose 8 is the same as the internal pressure of the air supply type airtight clothing 1, the internal pressure of the air supply type airtight clothing 1 can be measured by measuring the internal pressure of the air supply hose 8.
As can be seen from the above description, if the airtight test is performed according to the method according to the present embodiment, JIS
This means that the air tightness test specified in T8032 was conducted.

After completion of the airtight test, the air supply hose 8 is removed from the air supply hose connection member 3. The press screw 6d is loosened, the lid member cover 6c is moved to the side, and the engagement between the lid member cover 6c and the spring retainer 4c is released. The packing retainer 6b and the rubber packing 6a are removed from the exhaust valve 4. The exhaust valve cover 5 is elastically engaged with the spring retainer 4 c and the exhaust valve cover 5 is attached to the exhaust valve 4.

In the airtight test method according to the present embodiment, the internal pressure of the air supply type airtight clothing 1 after the air supply is stopped is measured by measuring the internal pressure of the air supply hose 8 connected to the air supply port 2a. 4 simply removes the cover 5 and does not require disassembly and recovery. Therefore, there is no possibility that the airtightness of the air-feeding airtight clothing 1 is impaired by the airtight test.

DESCRIPTION OF SYMBOLS 1 Air supply type airtight clothing 2 Airtight clothing main body 3 Air supply hose connection member 4 Exhaust valve 5 Exhaust valve cover 6 Lid member 7, 9 Induction pressure hose 8 Air supply hose

Claims (1)

Remove the cover of the exhaust valve of the air-tight airtight clothing, which is a chemical protective suit, and attach the lid member to the exhaust valve, and measure the internal pressure of the space between the valve body of the exhaust valve and the lid member, Air is supplied from the air supply source into the clothing via an air supply hose connected to the inside, and the inside of the clothing is pressurized until the internal pressure of the space between the valve body of the exhaust valve and the lid member reaches a predetermined value. An airtight test method for a chemical protective suit, characterized by measuring an internal pressure of an air supply hose when a predetermined time has elapsed after stopping.

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