CN200948794Y

CN200948794Y - Relay valve

Info

Publication number: CN200948794Y
Application number: CN 200620111397
Authority: CN
Inventors: 唐光辉; 李明旭; 蒋国英; 宾强
Original assignee: Chongqing Caff Automotive Braking and Steering Systems Co Ltd
Current assignee: Cafu Connor, commercial vehicle systems (Chongqing) Co., Ltd.
Priority date: 2006-09-22
Filing date: 2006-09-22
Publication date: 2007-09-19
Anticipated expiration: 2016-09-22

Abstract

A relay valve comprises a valve body, a driving piston with a piston push rod which is installed at one end of the valve body, a valve and a return spring which are driven by the piston push rod. Wherein, the piston is of jacket which consists of an external piston of the air cylinder and an internal piston working with the air cylinder. The piston push rod is fixed on the internal piston and an adjusting bolt is mounted in the piston push rod. An adjusting screw is positioned between the inner surface of the air cylinder and the internal piston and the adjusting screw is controlled by the adjusting bolt. The return spring can only ensure the returning and closing of the valve. The utility can adjust the delay time between the working airflow and the control airflow according to the air supply for the control airflow and the working airflow of different vehicles. In particular, when using two or more relay valves to control the working airflow respectively, the safety of the vehicle is guaranteed in the aspect of relay valve.

Description

A kind of relay valve

Technical field

The utility model relates to pneumatic control valve, specifically is a kind of relay valve that is applied on the automobile.

Background technology

Relay valve is a kind of switch valve of controlling air flow (working air current) break-make by little airflow (control air-flow).At present, be applied in relay valve on the automobile (referring to Fig. 1) comprise valve body, be installed in one end in the valve body the driven plunger that piston mandril is arranged, be installed in the valve body valve and pull back spring in the valve guide holder.This valve body have control chamber by its control mouthful and control air-flow UNICOM, with the working air current input port of source of the gas UNICOM and the delivery port of output services air-flow of working.Have in the current path between this air-flow input port and airflow delivery outlet one with this valve corresponding valve mouth, a Gask-O-Seal on the valve under the effect of pull back spring, compress and seal up this valve port.Airflow delivery outlet one side of an end of band shape packing seal in current path that is to say on the valve, and under the pent situation of current path, the air pressure that acts on the valve is identical with the force direction of pull back spring.Piston mandril contacts or contacts with the part of this Gask-O-Seal inboard with valve end face within this Gask-O-Seal with the direction opposite with the pull back spring application force, between this piston mandril and the valve port airspace is arranged, in other words, the diameter of piston mandril is much smaller than the internal diameter of valve port; With the piston end surface of piston mandril opposition side in control chamber one side.When needs are opened path at working air current, open and mouthful introduce a little airflow (control air-flow) from control, little airflow in the control of access chamber acts on driven plunger on the end face of control chamber one side, because this piston end face has enough big, so, this piston imposes propelling thrust (area of the corresponding end face of=little airflow pressure * piston) to valve gradually by its piston mandril, when propelling thrust even as big as after overcoming total power of closing (area of the corresponding end face of the application force+intake pressure of pull back spring * valve), valve opening (at this moment, only there is the application force of pull back spring having the opposite effect), the working air current path is open-minded, and working air current is exported from airflow delivery outlet; When needs closed gas flow path, stop control chamber air feed (and by other device allow the control mouth and the atmosphere UNICOM of this control chamber).Under the effect of pull back spring, valve is closed gradually, and is last under the secondary action again of intake pressure, make close more reliable.In essence, existing this relay valve is exactly a kind of in the common type pilot switch valve common in the pneumatic element.Yet the relay valve of this ordinary construction of use but exists the problem of incomplete adaptation on automobile.Because, the relay valve of existing this ordinary construction, each relevant part is changeless, and particularly pull back spring wherein is after product is installed, and its elastic force also is determined, and both can not regulate fully again.Can also be clear that from above-mentioned introduction original working air current just lags behind a bit than the control air-flow of straight leading role.And the size of automobile (dead-weight capacity), purposes and suitable driving conditions etc. vary, that is to say, in the various automobiles, it is not only incomplete same with air pressure, the flow of the air flow that plays the style of work to start to control the little airflow of making usefulness, and can constantly change in certain scope.So, working air current is with respect to just grasping the delay time of straight pilot air.If this working air current must drive the important mechanism (stop mechanism for example) of automobile, also can bring potential safety hazard---particularly coming under the situation of difference Control work air-flow with two or more relay valves, safety issue is just bigger.

The utility model content

The technical problems to be solved in the utility model is at the deficiencies in the prior art, to provide a kind of and can regulate the relay valve that its working air current lags behind the control air-flow time according to different automobiles.

The scheme that the utility model solves its technical matters is a kind of like this relay valve.Aspect same as the prior art is that this relay valve comprises valve body, is installed in the driven plunger that piston mandril is arranged of the one end in the valve body, is installed in valve and pull back spring in the interior valve guide holder of valve body.This valve body have control chamber by its control mouthful and control air-flow UNICOM, with the working air current input port of source of the gas UNICOM and the delivery port of output services air-flow of working.Have in the current path between this air-flow input port and airflow delivery outlet one with valve corresponding valve mouth, a Gask-O-Seal on the valve under the effect of pull back spring, compress and seal up this valve port.Airflow delivery outlet one side of an end of band shape packing seal in current path on the valve, piston mandril contacts or contacts with the part of this Gask-O-Seal inboard with valve end face within this Gask-O-Seal with the direction opposite with the pull back spring application force, between this piston mandril and the valve port airspace is arranged.With the piston end surface of piston mandril opposition side in control chamber one side.Its improvements are, piston of the present utility model is the shell type piston, and this shell type piston is made up of outer piston that includes cylinder block and the inner carrier that cooperates with this cylinder block, and piston mandril is on this inner carrier.In this piston mandril, have its threaded shank termination stretch in this cylinder block, and and piston mandril between by set screw of seal ring leak free.The cylinder block of this outer piston has an inner carrier pressurization hole on the end face of control chamber one side, that is to say, the control air-flow also pressurizes to its inner carrier by this pressurization hole when the outer piston in this shell type piston is pressurizeed simultaneously.Have between the inner end surface of inner carrier pressurization hole one side and the inner carrier at this cylinder block and to have compressed a regulating spring, the end that this regulating spring compresses inner carrier is mounted on the spring perch, and this spring perch is withstood on again on the threaded shank termination of aforementioned set screw.In other words, adjusting the pressure size of regulating spring, is to move forward and backward by the spring perch that turns set screw, allow it withstand to realize.Compress its other end and be seated in retracing spring in the valve body on this outer piston deviates from the end face of control chamber one side, the piston mandril after the improvement is to contact with the corresponding position of Gask-O-Seal on valve or the valve after air pressure being arranged in control chamber and having overcome the elastic force of this retracing spring.Wherein, the elastic force of pull back spring only can guarantee that the valve return closes.

From scheme as can be seen, because inner carrier wherein is in the cylinder block of outer piston, therefore, only for this inner carrier, its area that bears control air-flow air pressure is also correspondingly much smaller than the area of existing piston, is converted to the thrust of valve also widely less than the thrust of existing piston.The process that whole shell type piston pressurized moved and then pushed open valve is as follows: behind control air-flow control of access chamber, internally outer piston all pressurizes simultaneously; Wherein, the elastic force that outer piston overcomes retracing spring moves forward, it is just exerted pressure to regulating spring again simultaneously, regulating spring behind the pressurized and inner carrier itself under the combined action of air pressure of controlled air-flow, inner carrier drives piston mandril on it and is advanced to valve and contacts, continue reach to push valve open.When regulating spring was short to the most compressed state of its permission by accent, this shell type piston was suitable with existing piston, and its inner carrier almost moves simultaneously with outer piston; When regulating spring is transferred length to arrive the maximum elongation state of its permission, this regulating spring will be compressed to it at outer piston to be enough to the control air-flow when jointly inner carrier being promoted, just promote this inner carrier reach together, like this, its inner carrier is later than the time that outer piston moves and will postpones the most longly.Self-evident, the feature that adapts with said structure characteristics of the present utility model is, the elastic force of pull back spring wherein should be much smaller than the elastic force of existing pull back spring, and the elastic force of this return spring only can guarantee that the return of valve itself gets final product.Otherwise, below said preceence just can not bring into play.It is equally evident that after the valve return resealed valve port, owing to still have the effect of intake pressure, closing of its valve was still very failure-free.

Compared with prior art, because the regulating spring in the utility model can be adjusted between above-mentioned two extreme length, like this, just can regulate its working air current and lag behind the control air-flow time according to the air feed situation of the control air-flow and the working air current of different automobiles.That is to say that can control artificially or grasp this delay time.Especially when coming difference Control work air-flow with two or more the utility model relay valves, because described delay time can be under people's the control of grasp in advance, so, the safety issue of automobile, aspect relay valve, just be guaranteed (obviously, after the valve return resealed valve port, owing to still have the effect of intake pressure, closing of its valve was still very failure-free).

Description of drawings

Fig. 1---the structural representation of relay valve in the prior art

Fig. 2---structural representation of the present utility model

The specific embodiment

A kind of relay valve (with reference to figure 2).Aspect same as the prior art is that this relay valve comprises valve body, is installed in the driven plunger that piston mandril 511 is arranged of the one end in the valve body, is installed in valve 8 and pull back spring 3 in the interior valve guide holder 9 of valve body.Wherein, valve body is made up of upper valve body 1 and following valve body 2.This valve body have control chamber 12 by its control mouthfuls 11 and control air-flow UNICOM, with the working air current input port 21 of work source of the gas UNICOM and the delivery port 22 of output services air-flow, have in the current path between this air-flow input port 21 and airflow delivery outlet 22 one with valve 8 corresponding valve mouths, a Gask-O-Seal 4 on the valve 8 under the effect of pull back spring 3, compress and seal up this valve port.Airflow delivery outlet 22 one sides of an end of band shape packing seal 4 in current path on the valve 8, piston mandril 511 contacts or contacts with the part of these Gask-O-Seal 4 inboards with valve end face within this Gask-O-Seal 4 with the direction opposite with pull back spring 3 application forces, between this piston mandril 511 and the valve port airspace is arranged---in other words, the unlatching of valve 8 is passed valve port, and directly this valve port is left on this valve 8 tops and realize by piston mandril 511.With the piston end surface of piston mandril 511 opposition sides in control chamber 12 1 sides.Distinguishing characteristics of the present utility model is that piston wherein is the shell type piston---this shell type piston is made up of outer piston that includes cylinder block 521 and the inner carrier 51 that cooperates with this cylinder block 521---, and piston mandril 511 is on this inner carrier 51.In this piston mandril 511, also have its threaded shank termination stretch into this cylinder block 521 in and and piston mandril 511 between pass through set screw 6 of seal ring leak free.The cylinder block 521 of this outer piston has inner carrier pressurization hole 5210 on the end face of control chamber 12 1 sides, have between the inner end surface of inner carrier pressurization hole 5,210 one sides and the inner carrier 51 at this cylinder block 521 to have compressed a regulating spring 7.The end that this regulating spring 7 compresses inner carrier 51 is mounted on the spring perch 8, and this spring perch 8 is withstood on again on the threaded shank termination of aforementioned set screw 6.That is to say that when needing to adjust the pressure size of regulating spring 7, only need turn set screw 6, the spring perch 8 that allows it withstand moves forward and backward and can reach the adjustment purpose.On this outer piston deviates from the end face of control chamber 12 1 sides, compressing its other end and be seated in retracing spring 10 in the valve body---piston mandril 511 is (shown in Figure 2 be the latter) that contact with the corresponding position of Gask-O-Seal 4 on valve 8 or the valve 8 after air pressure being arranged in control chamber 12 and having overcome the elastic force of this retracing spring 10.The elastic force of pull back spring 3 wherein only can guarantee that valve 8 returns close.In other words, the elastic force of the pull back spring 3 in the utility model is more than of the prior art much weak, only need guarantee that valve 8 can reliable return be closed to get final product.

To the introduction of the utility model working process, after those skilled in the art had seen a last paragragh, can design did not fully substantially have the relay valve of difference with the utility model in the association schemes.Therefore, a last paragragh also is following each routine summation, and content identical with this summation part in each example is not given unnecessary details.

Embodiment 1:

This example is on the basis of summation part, and is for example concrete to of shell type piston wherein.(referring to Fig. 2) in this example, the periphery of cylinder block 521 waists of outer piston has the plate-like portion 522 of one of this outer piston component part of circle, and in other words, this routine outer piston is made up of cylinder block 521 partial sum plate-like portions 522.The periphery of this plate-like portion 522 and cylinder block 521 respectively have near the periphery of the part of valve ports one with valve body in the seal ring that corresponding position mated, on cylinder block 521 walls between these two seal rings, have a side spiracle 501 at least.The other end of this side spiracle 501 is between two seal rings between cylinder block 521 and the inner carrier 51, on the inner carrier 51 between two seal rings between cylinder block 521 and the inner carrier 51, a middle spiracle 502 that communicates with this side spiracle 501 is arranged also, in this other end of spiracle 502 be screwed into the back in set screw 6, on the hole wall of the screw via hole in the piston mandril 511 vacated.Obviously, outer piston being designed to the purpose be made up of cylinder block 521 partial sum plate-like portions 522, is in order to reduce inner carrier 51 area of thrust surface, with the setting range effectively of further expansion regulating spring 7.The shape of the corresponding position in shape that cylinder block 521 partial sum plate-like portions 522 are constituted and the valve body, be equivalent to cooperating of stepped shaft and stepped hole, therefore, side spiracle 501 wherein and middle spiracle 502 are implemented in order to ensure such cooperation, are provided with the vapour lock of eliminating in moving.

Embodiment 2:

This example is on the basis of embodiment 1, by eliminating improved the giving an example of vapour lock wherein more reliably.In this example (with reference to figure 2), have at cylinder block 521 on the end face of inner carrier pressurization hole 5,210 one sides a spacing hole or position-limited trough (being illustrated as spacing hole) are arranged, a limited post 510 that inserts in this spacing hole or the position-limited trough (being illustrated as spacing hole) is arranged on inner carrier 51, and side spiracle 501 and the distance between the middle spiracle 502 that communicate this moment are the shortest.In other words, spacing hole with place restrictions on cooperating of limited post 510 down, two spiracles can not stagger.In addition, when inner carrier 51 was in maximum propelling position, this limited post 510 stretches out this spacing hole or position-limited trough has 1mm at least.That is to say that under any circumstance, aforesaid inner carrier pressurization hole 5210 can not be closed.

Embodiment 3:

This example is on the basis of summation, embodiment 1 or embodiment 2, for the design-calculated that convenient adjustment regulating spring is made is given an example, (with reference to figure 2) in this example, valve 8 has the via hole that can allow the screwdriver that turns set screw 6 or interior hexagonal spanner pass through at least, the through hole that cooperates with this valve 8 afterbodys is arranged at the bottom of valve guide holder 9, and the corresponding end in valve body and these valve guide holder 9 bottoms has a seal cover cap 23.When the relay valve routine this is applied on a certain automobile, pull down seal cover cap 23 earlier, adjust set screw 6 with screwdriver or interior hexagonal spanner (be illustrated as and use straight screwdriver), adjust back Reseaable lid 23.Obviously, when adjusting for the first time, may repeated multiple times.After repeatedly adjustment obtained experience or adjusts platform by corresponding simulation, this adjustment was just than very fast.

Claims

1, a kind of relay valve, this relay valve comprise valve body, are installed in the driven plunger that piston mandril (511) are arranged of the one end in the valve body, are installed in valve (8) and pull back spring (3) in the valve guide holder (9) in the valve body; This valve body have control chamber (12) by its control mouthful (11) and control air-flow UNICOM, with the working air current input port (21) of work source of the gas UNICOM and the delivery port (22) of output services air-flow, have in the current path between this air-flow input port (21) and airflow delivery outlet (22) one with described valve (8) corresponding valve mouth, the Gask-O-Seal (4) on the valve (8) under the effect of pull back spring (3), compress and seal up this valve port; Valve (8) is gone up airflow delivery outlet (22) one sides of an end in current path of band shape packing seal (4), described piston mandril (511) contacts with valve end face within this Gask-O-Seal (4) with the direction opposite with pull back spring (3) application force or contacts with the inboard part of this Gask-O-Seal (4), between this piston mandril (511) and the valve port airspace is arranged; With the piston end surface of piston mandril (511) opposition side in control chamber (12) one sides, it is characterized in that described piston is the shell type piston, this shell type piston is made up of outer piston that includes cylinder block (521) and the inner carrier (51) that cooperates with this cylinder block (521); Described piston mandril (511) on this inner carrier (51), in this piston mandril (511), have its threaded shank termination stretch in this cylinder block (521) and and piston mandril (511) between by a set screw of seal ring leak free (6); The cylinder block of this outer piston (521) has an inner carrier pressurization hole (5210) on the end face of described control chamber (12) one sides, have between the inner end surface of inner carrier pressurization hole (5210) one sides and the inner carrier (51) at this cylinder block (521) and to have compressed a regulating spring (7), the end that this regulating spring (7) compresses inner carrier (51) is mounted on the spring perch (8), and this spring perch (8) is withstood on again on the threaded shank termination of described set screw (6); Compress its other end and be seated in retracing spring (10) in the described valve body on this outer piston deviates from the end face of described control chamber (12) one sides, described piston mandril (511) is to contact with the corresponding position of Gask-O-Seal (4) on described valve (8) or the valve (8) after in described control chamber (12) air pressure being arranged and having overcome the elastic force of this retracing spring (10); The elastic force of described pull back spring (3) only can guarantee that valve (8) return closes.

2, relay valve according to claim 1, it is characterized in that, the periphery of the cylinder block of described outer piston (521) waist has the plate-like portion (522) of one of this outer piston component part of circle, the periphery of this plate-like portion (522) and cylinder block (521) respectively have near the periphery of the part of described valve port one with described valve body in the seal ring that corresponding position mated, on cylinder block (521) wall between these two seal rings, have a side spiracle (501) at least; The other end of this side spiracle (501) is positioned between two seal rings between cylinder block (521) and the inner carrier (51), on the inner carrier (51) between two seal rings between cylinder block (521) and the inner carrier (51), a middle spiracle (502) that communicates with this side spiracle (501) is arranged also, on the hole wall of the screw via hole in the described piston mandril (511) that the other end of spiracle in this (502) is screwed into the back in described set screw (6), vacated.

3, relay valve according to claim 2, it is characterized in that, have at described cylinder block (521) on the end face of inner carrier pressurization hole (5210) one sides a spacing hole or position-limited trough are arranged, a limited post (510) that inserts in this spacing hole or the position-limited trough is arranged on described inner carrier (51), and side spiracle (501) and the distance between the middle spiracle (502) that communicate this moment are the shortest; When described inner carrier (51) was in maximum propelling position, this limited post (510) stretches out this spacing hole or position-limited trough has 1mm at least;

4, according to claim 1,2 or 3 described relay valves, it is characterized in that, described valve (8) has the via hole that can allow the screwdriver that turns set screw (6) or interior hexagonal spanner pass through at least, the through hole that cooperates with this valve (8) afterbody is arranged at the bottom of described valve guide holder (9), and the corresponding end in described valve body and this valve guide holder (9) bottom has a seal cover cap (23).