CN201379914Y

CN201379914Y - Switching valve of movable air-source supplying auxiliary escape device

Info

Publication number: CN201379914Y
Application number: CN200920070872U
Authority: CN
Inventors: 廖志军; 胡迎祥
Original assignee: Sperian Protection China Co Ltd
Current assignee: Honeywell Safety Products Shanghai Co Ltd
Priority date: 2009-04-22
Filing date: 2009-04-22
Publication date: 2010-01-13
Anticipated expiration: 2019-04-22

Abstract

The utility model relates to a switching valve of a movable air-source supplying auxiliary escape device, which is mainly composed of a valve body and a T-shaped piston; the valve body is hollow, and air current holes are arranged on the valve body and are respectively communicated with a main air source, an air supplying medium-pressure pipe and an alternate air source, and at the same time, an air current hole which leads the alternate air source and the air supplying medium-pressure pipe to be communicated is arranged on the valve body; the piston is arranged in the cavity of the valve body, one end having larger section area of the piston is close to the main air source, and one end having smaller section area of the piston is close to the alternate air source; when the pressure of the alternate air source to the piston is higher than the pressure of the main air source to the piston, the piston moves to one end of the main air source automatically, closes the end of the main air source and conducts the air current hole at the end of the alternate air source and the air supplying medium-pressure pipe under the action of the pressure of the alternate air source, so as to realize to automatically switch to the alternate air source, provide air supplying for users, prevent the users from being damaged accidentally and ensure the users to get away from working field safely when the emergency situation happens.

Description

The transfer valve of the attached escape device of mobile air supply source

Technical field

The utility model relates to the attached escape device of a kind of mobile air supply source, relates in particular to a kind of supply during air, to the improvement of the attached escape device transfer valve of user's reliable mobile air supply source as safe as a house in face shield.

Background technology

Mobile air supply source is called long tube positive-pressure type air respiratorresuscitator again, and two or four gas cylinders are housed usually, and is furnished with long 30 meters to 50 meters middle pressure appendixs that do not wait, and can make fire-fighting or industrial lifesaving personnel enter disaster and more give first aid at the depth scene.Because the gas cylinder air demand is limited, storage pressure is when 55 ± 5Bar scope, starts working in the warning whistle that is installed on the mobile source of the gas pressure-reducing valve.Generally, the rescue personnel is far away from mobile source of the gas main body, and accident or scene of fire sound are more noisy, and the rescue personnel is very possible not to withdraw the signal accident that meets accident owing to hear warning.

Existing mobile air supply source exist since main mobile source of the gas medium pressure supply pipe breakage or other fortuitous event cause mobile source of the gas normally air feed make the rescue personnel produce the defective of unexpected injury; in addition; the equipment of present employed bailout gas all is to have adopted the pattern of manual switching to carry out; promptly when the user feels to breathe, open bailout gas again and use for escape, existing through regular meeting like this owing in case of emergency can't open the generation that bailout gas causes death by accident timely.

The utility model content

The purpose of this utility model provides a kind of attached escape device transfer valve of mobile air supply source of new structure, this transfer valve can automatically switch to bailout gas when situation appears in mobile source of the gas or danger such as air supply pipe breakage takes place, and with assurance the user is more safely left the working site when being in an emergency.

The purpose of this utility model realizes by following structure:

The transfer valve of the attached escape device of mobile air supply source, it comprises:

One valve body, this valve body hollow and which is provided with airflow hole and communicate with pressure pipe and bailout gas in gas source, the air feed respectively also is provided with the airflow hole that bailout gas can be communicated with pressure pipe in the air feed on the valve body simultaneously;

One T shape piston places the cavity of described valve body, and the bigger end of this piston cross-section area is near gas source, and the less end of area of section is near bailout gas;

When gas source to the pressure of piston greater than bailout gas during to the pressure of piston, piston communicates bailout gas with pressure pipe in the air feed airflow hole sealing, the airflow hole connection that gas source is communicated with pressure pipe in the air feed; When bailout gas to the pressure of piston greater than gas source during to the pressure of piston, piston is communicated with the airflow hole that bailout gas communicates with pressure pipe in the air feed, the airflow hole that gas source is communicated with pressure pipe in the air feed seals.

Preferably, described valve body is provided with the warning whistle that communicates with the airflow hole of pressure pipe connection in the air feed, be provided with in the endoporus at this warning whistle and press damper in one, like this, after piston is promoted by bailout gas, bailout gas end airflow hole is connected with the warning whistle, and the warning of can blowing a whistle immediately of the warning whistle reminds the user to lose no time to withdraw the working site.

Preferably, respectively establish an O RunddichtringO in the groove at described piston size two ends, the air-flow of gas source end and bailout gas end is separated realizing, and piston mobile in valve body had guide effect.

Further, described valve body is connected with gas source snap joint, the quick female joint of R1/4, bailout gas joint respectively by screw thread.

Preferably, the ratio of the area of section at described piston size two ends is 7: 3, this with when work required air pressure relevant, because the air pressure of gas source and bailout gas was about 7Bar when this device normally used, and when the air pressure of gas source is lower than 3Bar, bailout gas needs to start, so the ratio of the area of section at these two ends is about 7: 3; This area ratio can specifically be set according to actual needs.

The utility model is owing to adopted above-mentioned technical scheme, make it compared with prior art, have following advantage and good effect: when mobile air feed gas source goes wrong normally air feed when predetermined value (gas source air pressure less than in advance), the utility model transfer valve can automatically switch to bailout gas and follow the warning of blowing a whistle, for the normal air feed of user with remind the user working site that speeds away, avoid user's injury that has an accident, ensured user's safety.

Description of drawings

By following the utility model is moved the embodiment of the attached escape device transfer valve of air supply source and in conjunction with the description of its accompanying drawing, can further understand the purpose of this utility model, specific structural features and advantage.Wherein, accompanying drawing is:

The partial cutaway schematic of the utility model transfer valve when Fig. 1 is the normal air feed of mobile source of the gas.

Fig. 2 is the partial cutaway schematic that bailout gas starts back the utility model transfer valve.

The specific embodiment

Fig. 1, the attached escape device transfer valve of novel mobile air supply source shown in Figure 2 are on the waistband of valve body 3 by the fixing escape of the attachment screw source of the gas carapace of four M3.Valve body 3 hollows and which is provided with

airflow hole

13,14,15 and communicate with pressure pipe and bailout gas in gas source, the air feed respectively also are provided with the airflow hole 16 that bailout gas can be communicated with pressure pipe in the air feed on the valve body 3 simultaneously.One T shape piston 11 is housed in the cavity of valve body 3, the close gas source of the end that these piston 11 areas of section are bigger, the close bailout gas of an end that area of section is less, the ratio of the area of section at piston 11 big or small two ends is 7: 3, comes the pressure of regulating piston switching by the area at piston two ends.O RunddichtringO 7 and O RunddichtringO 12 are housed in the groove of piston 11, the air-flow of mobile source of the gas end and escape source of the gas end are separated realizing, and piston 11 mobile in valve body 3 had guide effect.In the present embodiment, at the left end of valve body 3, gas source snap joint 1 is connected with valve body 3 by screw thread, and seals by O RunddichtringO 2, and gas source snap joint 1 can seal with the middle pressure pipe snap joint (not shown) of mobile source of the gas.Right-hand member at valve body 3, bailout gas joint 5 is connected with valve body 3 by screw thread, and seals by O RunddichtringO 2, at the endoporus place of bailout gas joint 5, one O RunddichtringO 6 also is housed, and the sealing circle is used for and the sealing of escape source of the gas pressure pipe (not shown).Upside at valve body 3, the quick female joint 4 of R1/4 is connected with valve body 3 by the sealed tube screw thread, the air stream outlet that the quick female joint 4 of R1/4 is installed for this reason, pressure pipe in the air feed (the middle pressure pipe that links to each other with steam supply valve) can directly be connected with the quick female joint 4 of R1/4 by supporting joint realizes air feed.At the downside of valve body 3, the warning whistle 10 is connected with valve body 3 by screw thread, and seals by O RunddichtringO 8, and middle pressure damper 9 is contained in the endoporus at the warning whistle 10, is used to regulate the flow at the warning whistle.

Figure 1 shows that when mobile source of the gas and bailout gas is opened simultaneously and duties of transfer valve during operate as normal all.The atmospheric pressure that this moment, transfer valve moved source of the gas and escape source of the gas end is 7Bar, because the piston area of escape source of the gas end is 3/7 of a mobile source of the gas end piston area, and when eupnea, the atmospheric pressure of mobile source of the gas end can not be lower than 4Bar, so in whole respiratory, piston can be in the right-hand member (position shown in Figure 1) of valve body 3 all the time under the effect of air pressure, air communication was crossed airflow hole 13 and airflow hole 14 and passed to steam supply valve for breathing use (shown in Fig. 1 direction of arrow) this moment.

Figure 2 shows that under the situation that mobile source of the gas breaks down or source of the gas has used up, bailout gas is opened the duty of back transfer valve automatically.This moment, transfer valve moved the atmospheric pressure of source of the gas end less than 3Bar, the atmospheric pressure of escape source of the gas end is 7Bar, piston is under the effect of air pressure, piston can automatically switch to the left end (position shown in Figure 2) of valve body 3, air communication is crossed

airflow hole

15,16,14 and is passed to steam supply valve for breathing use at this moment, and air communication is crossed

airflow hole

15 and 16 and realized warning function (shown in Fig. 2 direction of arrow) to the warning whistle.

Though the utility model is illustrated hereinbefore according to preferred embodiment of the present utility model; but this does not represent that protection domain of the present utility model is confined to above-mentioned structure, if by structure that claim of the present utility model covered all within protection domain.Those skilled in the art can be developed the equivalent substitution structure that at an easy rate after reading above-mentioned explanation, and these equivalent alternative structure also are within the scope that this case requires.

Claims

1, the transfer valve of the attached escape device of a kind of mobile air supply source is characterized in that comprising:

One valve body (3), this valve body (3) hollow and which is provided with airflow hole (13), (14), (15) and communicate with pressure pipe and bailout gas in gas source, the air feed respectively also is provided with airflow hole (16) on the valve body (3) simultaneously;

One T shape piston (11) places the cavity of described valve body (3), and the bigger end of this piston (11) area of section is near gas source, and the less end of area of section is near bailout gas;

When gas source for the pressure of piston (11) greater than bailout gas during for the pressure of piston (11), piston (11) is with airflow hole (16) and (14) sealing, airflow hole (13) is communicated with (14); When bailout gas for the pressure of piston (11) greater than gas source during for the pressure of piston (11), piston (11) is with airflow hole (13) and (14) sealing, airflow hole (16) is communicated with (14).

2, the transfer valve of the attached escape device of mobile air supply source as claimed in claim 1 is characterized in that: described valve body (3) is provided with the warning whistle (10) that communicates with airflow hole (16), is provided with in the endoporus at this warning whistle (10) and presses damper (9) in one.

3, the transfer valve of the attached escape device of mobile air supply source as claimed in claim 1 or 2 is characterized in that: be provided with O RunddichtringO (7) and O RunddichtringO (12) in the groove of described piston (11).

4, as claim 1 or 2 or the transfer valve of the attached escape device of described mobile air supply source, it is characterized in that: the end that described valve body (3) is provided with airflow hole (13) is connected with gas source snap joint (1) by screw thread.

5, the transfer valve of the attached escape device of mobile air supply source as claimed in claim 1 or 2 is characterized in that: the end that described valve body (3) is provided with airflow hole (14) is connected with the quick female joint of R1/4 (4) by screw thread.

6, the transfer valve of the attached escape device of mobile air supply source as claimed in claim 1 or 2 is characterized in that: the end that described valve body (3) is provided with airflow hole (15) is connected with bailout gas joint (5) by screw thread.

7, the transfer valve of the attached escape device of mobile air supply source as claimed in claim 1 or 2 is characterized in that: the ratio of the area of section at the big or small two ends of described piston (11) is 7: 3.