CN201208961Y

CN201208961Y - Two stage pressure regulating urgent synchronous relay valve

Info

Publication number: CN201208961Y
Application number: CNU2008201192460U
Authority: CN
Inventors: 屠程鑫
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-03-01
Filing date: 2008-06-20
Publication date: 2009-03-18
Anticipated expiration: 2018-06-20

Abstract

The utility model discloses an emergency synchronization relay valve for two-stage adjustment of pressure, comprising an upper valve body, a lower valve body in sealing match with the upper valve body, a control port on the upper valve body, as well as an air intake mechanism and an air outlet which are arranged on the lower valve body; the middle upper part of the lower valve body is provided with a piston; a partition disc is arranged at the periphery of the piston; a cavity body is arranged between the partition disc and the piston; an emergency valve is arranged under the piston arranged at the middle upper part of the lower valve body; a valve seat is arranged in the inner cavity below the emergency valve; a valve is arranged in the valve seat; a connecting pipe is arranged at one side of the lower valve body, and a switch is arranged on the connecting pipe; and the switch can optionally cause the connection and the disconnection of the air outlet with the cavity body. The utility model is applicable to the emergency synchronization brake of a multi-axle trailer and a semi-trailer.

Description

The urgent relay valve synchronously of two-stage pressure-regulating

Technical field

The utility model relates to a kind of brake equipment, relates in particular to a kind of adjustable urgent relay valve synchronously of pressure two-stage that is used on many bridges trailer, the superimposed trailer vehicle.

Background technology

At present, at common many bridges trailer, urgent relay valve synchronously on the superimposed trailer vehicle comprises upper valve body, the following valve body that is sealed and matched with upper valve body, upper valve body one side is provided with and controls the control mouth that source of the gas is connected, following valve body is provided with the admission port that links to each other with the air feed source of the gas, air supply opening that is connected with air receiver and the air extractor duct that links to each other with brake system, following valve body middle upper portion is provided with up big and down small piston, be provided with emergency piston under the following valve body intermediate piston, the emergency piston inner chamber is provided with valve seat, be provided with valve in the valve seat, by admission port and air supply opening, make supply air line come pressurized air to enter air receiver, work as glancing impact, the pressurized air of coming from pilot piping enters from the control mouth, acts on piston top, piston is moved down close exhaust clearance, and open the air inlet gap, the pressurized air in air receiver arrives air extractor duct from air supply opening through the air inlet gap, because the gas pressure of air extractor duct is in the less piston bottom of area, thereby output pressure increases fast, thereby plays brake action; And when brake off, control mouthful exhaust, the air pressure of air extractor duct makes and moves on the piston, thereby opens exhaust clearance, closes the air inlet gap, and opens valve, makes air extractor duct air pressure through valve and exhausr port exhaust to atmosphere.The deficiency that this urgent relay valve synchronously exists is: because the output pressure of air extractor duct size is recently determined by the area of big end of piston and small end, and the size of piston upper and lower side is changeless, thereby the output pressure of air extractor duct also is invariable, in order to play braking effect preferably, the size of braking force is that the vehicle by rated load, nominal load carries out design-calculated, and in fact, when vehicle during in zero load, because load is less, if the braking force when still adopting rated load, nominal load is bound to vehicle is produced harmful effect.

The utility model content

Technical problem to be solved in the utility model provides a kind of urgent relay valve synchronously of realizing that the pressure two-stage is regulated.

In order to solve the problems of the technologies described above, the utility model is achieved through the following technical solutions:

The utility model comprises upper valve body, the following valve body that is sealed and matched with upper valve body, described upper valve body one side is provided with and controls the control mouth that source of the gas communicates, described valve body down is provided with admission gear and air extractor duct, described valve body middle upper portion down is provided with piston, described piston periphery is provided with every dish, described every the dish and piston between be provided with cavity, be provided with emergency piston under the valve body intermediate piston under described, emergency piston top inner chamber is stretched in described piston bottom, described emergency piston lower lumen is provided with valve seat, be provided with valve in the described valve seat, described valve body one side down is provided with connection pipe, described connection pipe is provided with switch, and described switch selectively makes cavity cut out with air extractor duct or be communicated with.

Because the utility model is provided with connection pipe in following valve body one side, connection pipe one end with every the dish with piston between cavity be connected, the connection pipe other end is connected with air extractor duct, and switch is set on connection pipe, cavity is communicated with air extractor duct or closes, thereby the delivery pressure two-stage that realizes air extractor duct is adjustable.

Description of drawings

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is that the A-A of Fig. 1 is to cut-away view.

The specific embodiment

Below in conjunction with the drawings and the specific embodiments the utility model is described in further detail:

Extremely shown in Figure 2 as Fig. 1, the utility model comprises upper valve body 1, the following valve body 2 that is connected with upper valve body 1, upper valve body 1 one sides are provided with control mouth 3, control mouth 3 is connected with the control source of the gas, following valve body 2 one sides are provided with admission port 4, admission port 4 is connected with the air feed source of the gas, following valve body 2 opposite sides are provided with air supply opening 5, air supply opening 5 is connected with air receiver, following valve body 2 belows are provided with a plurality of air extractor ducts 6, air extractor duct 6 is connected with brake system, be provided with piston 7 at following valve body 2 middle upper parts, piston 7 is up big and down small structure, piston 7 peripheries are provided with every dish 8, present little macrostructure down every dish 8, between dish 8 and piston 7, be provided with cavity 9, be provided with emergency piston 10 under the piston 7, emergency piston 10 is presented little macrostructure down, emergency piston 10 top inner chambers are stretched in described piston 7 bottoms, emergency piston 10 intermediate pistons 7 belows are provided with valve seat 11, be provided with valve 12 in the valve seat 11, be provided with exhaust clearance 13 between piston 7 bottoms and valve 12 upper surfaces, be provided with the gap between valve seat 11 and the valve 12, valve seat 11 peripheries are provided with valve spring 14, and valve spring 14 is connected with valve 12 upper ends, and valve 12 is moved up and down, close or the unlatching effect thereby play, emergency piston 10 lower, outer perimeter are provided with lining 15, and lining 15 peripheries are sealed and matched with following valve body 2, and lining 15 belows are provided with spring perch 16, spring perch 16 is provided with exhausr port 17, and exhausr port 17 places also are provided with dustproof sheet 18; Be provided with pressure gap 19 between emergency piston 10 and the following valve body 2, pressure gap 19 is connected with admission port 4, emergency piston 10 is provided with air inlet gap 20 with valve 12 upper surfaces, is provided with inlet chamber 21 between emergency piston 10 peripheries and following valve body 2 inner chambers, and inlet chamber 21 is connected with air inlet gap 20; Following valve body 2 one sides are provided with connection pipe 25, and connection pipe 25 is provided with switch 26, connection pipe 25 1 ends with every the dish 8 with piston 7 between cavity 26 be connected, connection pipe 25 other ends are connected with air extractor duct 6.

Working process of the present utility model is as follows:

The pressurized air of coming from the air feed source of the gas is entered by admission port 4, enter inlet chamber 19 by check valve, and charge into air receiver through air inlet gap 20 and air supply opening 5, when taking place that tractor truck breaks off relations or supply air line breaks, check valve is closed under air supply opening 5 pressure effects, air pressure can not be discharged from admission port 4, simultaneously emergency piston 10 is used at pressure and is moved, thereby open air inlet gap 20, close exhaust clearance 13, make the pressurized air of air supply opening 5 enter brake repair room by air extractor duct 6, thereby realize autobrake through air inlet gap 20.

When the vehicle normal load, make the switch on the connection pipe 25 be in closed condition, the pressurized air of coming from pilot piping enters from control mouth 3, act on piston 7 tops, piston 7 is moved down close exhaust clearance 13, and open air inlet gap 20, pressurized air in air receiver 20 arrives air extractor ducts 6 from air supply opening 5 through the air inlet gap, because the cavity 26 between dish 8 and piston 7 is in closed condition with air extractor duct 6, air pressure in the cavity 26 communicates with exhausr port 17 through piston 7, exhaust to atmosphere, actual piston 7 lower reaction areas are much smaller than piston 7 top areas, and the gas pressure of air extractor duct 6 is in less piston 7 bottoms of area, thereby output pressure increases fast, thereby plays brake action.

And when vehicle is unloaded, make the switch on the connection pipe 25 be in opening, the pressurized air of coming from pilot piping enters from control mouth 3, act on piston 7 tops, piston 7 is moved down close exhaust clearance 13, and open air inlet gap 20, pressurized air in air receiver 20 arrives air extractor ducts 6 from air supply opening 5 through the air inlet gap, because the cavity 26 between dish 8 and piston 7 is in connected state with air extractor duct 6, the active area of piston 7 bottoms is increased, thereby output pressure reduces, and reduced braking force thereby compare with normal load.

Claims

1, the urgent relay valve synchronously of a kind of two-stage pressure-regulating, comprise upper valve body, the following valve body that is sealed and matched with upper valve body, described upper valve body one side is provided with and controls the control mouth that source of the gas communicates, described valve body down is provided with admission gear and air extractor duct, described valve body middle upper portion down is provided with piston, described piston periphery is provided with every dish, described every the dish and piston between be provided with cavity, be provided with emergency piston under the valve body intermediate piston under described, emergency piston top inner chamber is stretched in described piston bottom, described emergency piston lower lumen is provided with valve seat, be provided with valve in the described valve seat, it is characterized in that described down valve body one side is provided with connection pipe, described connection pipe is provided with switch, and described switch selectively makes cavity cut out with air extractor duct or be communicated with.