CN108437964A - Vehicular air processing unit assembly and its four-loop protection valve - Google Patents
Vehicular air processing unit assembly and its four-loop protection valve Download PDFInfo
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- CN108437964A CN108437964A CN201810601329.1A CN201810601329A CN108437964A CN 108437964 A CN108437964 A CN 108437964A CN 201810601329 A CN201810601329 A CN 201810601329A CN 108437964 A CN108437964 A CN 108437964A
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- valve
- mouthfuls
- pressure limiting
- outlet passageway
- chamber
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- 230000000670 limiting effect Effects 0.000 claims abstract description 168
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 24
- 239000011148 porous material Substances 0.000 claims description 22
- 229910052742 iron Inorganic materials 0.000 claims description 12
- 238000007789 sealing Methods 0.000 claims description 7
- 239000012528 membrane Substances 0.000 claims description 2
- 230000000712 assembly Effects 0.000 abstract description 2
- 238000000429 assembly Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 7
- 238000004146 energy storage Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
- B60T17/04—Arrangements of piping, valves in the piping, e.g. cut-off valves, couplings or air hoses
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/24—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being gaseous
Abstract
The invention discloses a kind of four-loop protection valves; including valve body; the valve body is equipped with air inlet and inlet channel; 21 mouthfuls, 22 mouthfuls, 23 mouthfuls and 24 mouthfuls are additionally provided on the valve body; it is correspondingly provided with the first outlet passageway, the second outlet passageway, third outlet passageway and the 4th outlet passageway respectively with described 21 mouthfuls, 22 mouthfuls, 23 mouthfuls and 24 mouthfuls in the valve body, piston valve gear is respectively equipped between first outlet passageway, the second outlet passageway, third outlet passageway and the 4th outlet passageway and the inlet channel；The pressure limiting valve system closed after the pressure of described 23 mouthfuls and 24 mouthfuls reaches given threshold is equipped between the inlet channel and the third outlet passageway and the 4th outlet passageway；Relief valve mechanism is equipped between the third outlet passageway and first outlet passageway.The invention also discloses a kind of Vehicular air processing unit assemblies, including drier and four-loop protection valve as described above, the gas outlet of the drier to be connected with the air inlet.
Description
Technical field
The invention belongs to vehicle braking control system and its component technology fields, specifically single for a kind of processing of Vehicular air
First assembly and its four-loop protection valve.
Background technology
Four-loop protection valve (rear referred to as four protect valve) is arranged by certain relationship by multiple pressure limiting check-valves (usual four),
Part suitably attached remaining functional entity, to realize that the branch supply of air source in commercial car brake system can guarantee that each circuit is only
Vertical normal work.It is when having a partial failure in gas braking system that it, which is acted on, and four guarantor's valves can make other circuits
Inflation and gas supply it is unaffected.Full vehicle gas circuit is divided into four and not only connected each other but also mutually independent time by four-loop protection valve
Road does not influence normal work and the inflation in other circuits when any one circuit is broken down (such as disconnected, leakage).In positive reason
Under condition, four-loop protection valve is actually a five-way joint, just plays protection when only the generation of certain primary Ioops breaks, leaks failure and makees
With.
Although existing four-loop protection valve disclosure satisfy that requirement to a certain extent, there are still the followings not
Foot：
1, in the prior art, four 21 mouthfuls, 22 mouthfuls, 23 mouthfuls and 24 mouthfuls of mounting surfaces for protecting valve cause not in same plane
Entire product installation space size is big；
2,23 mouthfuls and 24 mouthfuls of existing four guarantors valve need external pressure limiting valve to limit pressure without pressure-limiting function；
3,21 mouthfuls and 22 mouthfuls of no pressure monitoring functions of existing four guarantors valve, external pressure sensor that could monitor pressure
Power；
4, the existing four back flow protection functions of protecting between 21 mouthfuls and 23 mouthfuls of valve are controlled by check valve, flow velocity and pressure
Force value is all inaccurate.
Invention content
In view of this, in order to overcome the deficiencies in the prior art, the purpose of the present invention is to provide a kind of automobile-used skies
Gas disposal unit assembly and its four-loop protection valve.
In order to achieve the above objectives, the present invention provides the following technical solutions：
Present invention firstly provides a kind of four-loop protection valve, including valve body, the valve body is equipped with air inlet and air inlet
Channel, is additionally provided with 21 mouthfuls, 22 mouthfuls, 23 mouthfuls and 24 mouthfuls on the valve body, in the valve body with described 21 mouthfuls, 22 mouthfuls, 23 mouthfuls and 24
Mouth is correspondingly provided with the first outlet passageway, the second outlet passageway, third outlet passageway and the 4th outlet passageway respectively, and described first goes out
It is respectively equipped with piston between gas channel, the second outlet passageway, third outlet passageway and the 4th outlet passageway and the inlet channel
Valve system；
It is equipped between the inlet channel and the third outlet passageway and the 4th outlet passageway and works as described 23 mouthfuls and 24 mouthfuls
Pressure reach the pressure limiting valve system closed after given threshold；It is set between the third outlet passageway and first outlet passageway
There is relief valve mechanism.
Further, it is equipped with pressure sensor for described 21 mouthfuls and 22 mouthfuls.
Further, the piston valve gear includes the valve seat being fixedly mounted on the valve body, and valve is equipped in the valve seat
Chamber is correspondingly provided with inner cavity and exocoel on the valve body with the valve chamber, and the exocoel is annular chamber and is arranged around the inner cavity,
It is equipped with diaphragm between the valve seat and the valve body, and is equipped in the valve seat for making the diaphragm be fitted in the valve body
And separate the press plate mechanism of the inner cavity and exocoel.
Further, the press plate mechanism includes the pressing plate being slidably installed in the valve chamber, the pressing plate with it is described
It is equipped between valve chamber for making the pressing plate be pressed on the diaphragm and separating the rag iron spring of the inner cavity and exocoel.
Further, the rag iron spring is equipped with backwards to one end of the pressing plate adjusts pressing plate, and the valve seat is equipped with and is used for
It adjusts the spacing between the adjusting pressing plate and the pressing plate and then adjusts the adjusting screw I of the pre- elastic force of the rag iron spring.
Further, described 21 mouthfuls, 22 mouthfuls, 23 mouthfuls and 24 mouthfuls of axis is mutually parallel and hangs down with the axis of the air inlet
Directly, and on 21 mouthfuls, 22 mouthfuls, the 23 mouthfuls and 24 mouthfuls the same side side walls for being arranged at the valve body；All valve chambers
Axis is parallel with the axis of the air inlet and the valve seat vertical and all with 21 mouthfuls of the axis is arranged at institute
It states on the same side side wall of valve body.
Further, the inner cavity and corresponding first outlet passageway, the second outlet passageway, third outlet passageway or
Four outlet passageways are connected, and the exocoel is connected with the inlet channel；Or the exocoel and corresponding first outlet
Channel, the second outlet passageway, third outlet passageway or the 4th outlet passageway are connected, and the inner cavity is connected with the inlet channel
It is logical.
Further, the pressure limiting valve system includes that the pressure limiting valve chamber being arranged in the valve body and lid are mounted in the pressure limiting valve
Pressure limiting valve deck on chamber；The pressure limiting piston that the pressure limiting valve intracavitary is equipped with pressure limiting valve and is fixedly connected with the pressure limiting valve,
The pressure limiting piston is between the pressure limiting valve and the pressure limiting valve deck；
The pressure limiting valve intracavitary is equipped with the pressure limiting inlet chamber and pressure limiting outlet chamber for being located at pressure limiting valve both sides, institute
It states pressure limiting inlet chamber and is located at the pressure limiting valve backwards to the side of the pressure limiting piston, the pressure limiting outlet chamber is located at the pressure limiting
Between valve and pressure limiting piston；
Between the pressure limiting piston and the pressure limiting valve deck be equipped with for make the pressure limiting valve keep it turned on and
Described 23 mouthfuls and 24 mouthfuls of pressure reaches the limiting mechanism of pressure closed after given threshold.
Further, the limiting mechanism of pressure includes the pressure limiting bullet being arranged between the pressure limiting piston and the pressure limiting valve deck
Spring.
Further, the one end of the pressure limiting spring towards the pressure limiting valve deck is equipped with pressure limiting adjustable plate, the pressure limiting valve deck
On for adjusting the spacing between the pressure limiting adjustable plate and the pressure limiting piston and then adjusting the pre- elastic force of the pressure limiting spring
Adjusting screw II.
Further, the pressure limiting inlet chamber is connected with the inlet channel, is correspondingly arranged with described 23 mouthfuls and 24 mouthfuls
The inlet end of the piston valve gear is connected with the pressure limiting outlet chamber；Or with described 23 mouthfuls and 24 mouthfuls of pistons being correspondingly arranged
The outlet side of valve system is connected with the pressure limiting inlet chamber, the third outlet passageway and the 4th outlet passageway respectively with it is described
Pressure limiting outlet chamber is connected.
Further, the axis of the pressure limiting valve chamber is vertical with the axis of the air inlet, and the axis of the pressure limiting valve chamber
It is vertical with 21 mouthfuls of the axis.
Further, the relief valve mechanism includes the safe valve chamber being arranged in the valve body, and the safe valve chamber includes
Major diameter section, central diameter section and path section, between the major diameter section and the path section, the major diameter section is located at the central diameter section
The outside of the central diameter section；The internal diameter of the major diameter section is more than the internal diameter of the central diameter section, and the internal diameter of the central diameter section is more than institute
State the internal diameter of path section；
Guide sleeve is fixed in the major diameter section, inner side end of the guide sleeve towards the safe valve chamber bottom of chamber is equipped with
The internal diameter guide hole equal with the central diameter section, the central diameter section is interior to be equipped with the safe piston being slidably matched with it, and the safety is living
The outer end of plug extend into the guide hole and is slidably matched with the guide hole；
One end end face of the safe piston towards the guide sleeve is equipped with blind hole, the bottom hole of the blind hole and the guide hole
Bottom hole between be equipped with the safety for making the inner side end of the safe piston and the central diameter section be engaged in a free state
Spring；
Annular chamber is formed between the guide sleeve periphery wall and the major diameter section inner wall, the side wall of the guide hole is equipped with and institute
The intercommunicating pore that annular chamber is connected is stated, the valve body is equipped with the exhaust outlet being connected with the annular chamber；
The inner wall of the central diameter section is equipped with annular groove, and the side wall of the blind hole is equipped with throttling pore, and described
When safe piston and the inner side end of the central diameter section are engaged, the throttling pore is connected to the annular groove, described
Annular groove is connected with the third exhaust passage, and the path section is connected with the first exhaust passage.
Further, it is equipped between the safe piston and the inner wall of the central diameter section close on the inside of the annular groove
Seal；It is equipped in the guide hole and extends radially inwardly annular protrusion, the internal diameter of the annular protrusion is less than the safe piston
Outer diameter, and when the inner side end of the safe piston and the central diameter section is engaged, ring described in the safe plunger distance
The axial distance of shape protrusion is more than axial distance of the throttling pore apart from the sealing ring.
Further, outer end of the safety spring towards the guide sleeve is equipped with safe adjustable plate, and the guide sleeve, which is equipped with, to be used
In the adjusting screw III for adjusting the spacing between the safe adjustable plate and the safe piston.
Further, the exhaust outlet is equipped with exhaust diaphragm.
Further, the axis of the safe valve chamber is parallel with 21 mouthfuls of the axis, and the axis of the safe valve chamber is same
When it is vertical with the axis of the air inlet and valve chamber.
The invention also provides a kind of Vehicular air processing unit assemblies, including drier and four circuit as described above to protect
Valve is protected, the gas outlet of the drier is connected with the air inlet.
The beneficial effects of the present invention are：
The four-loop protection valve of the present invention, by being set between inlet channel and third outlet passageway and the 4th outlet passageway
Pressure limiting valve system is set, pressure limiting valve system can be closed after the pressure of 23 mouthfuls and 24 mouthfuls reaches given threshold, realize 23 mouthfuls and 24 mouthfuls
Pressure limiting, the pressure in 23 mouthfuls and 24 mouthfuls is the voltage limiting value of 23 mouthfuls and 24 mouthfuls at this time；By in third outlet passageway and described the
Relief valve mechanism is set between one outlet passageway, after dying for 21 mouthfuls, it can be ensured that 23 mouthfuls of air pressure also declines, and 23 mouthfuls external to stay
Vehicle assists hand control valve, so that and it releases air pressure and declines, spring brake chamber realizes automatic parking under energy storage spring effect,
Play driving defencive function；To sum up, four-loop protection valve of the invention does not have in the external pressure limiting valve of peripheral hardware and check valve, you can real
Existing 23 mouthfuls and 24 mouthfuls of pressure limitings and back flow protection function.
Specifically, the principle of the Vehicular air processing unit assembly of the present invention is as follows：
The gas that mouth is handled through drier enters from air inlet, and a part reaches exocoel/inner cavity, acts on diaphragm and pressing plate
On, after active force is more than the active force of rag iron spring, piston valve gear is opened, and air pressure reaches inner cavity/exocoel, from 21 mouthfuls and 22
Mouth outlet；By in 21 mouthfuls and 22 mouthfuls of setting pressure sensors, can directly can in real time be monitored by pressure sensor 21 mouthfuls and
22 implication pressures judge pressure value convenient for vehicle；
While 21 mouthfuls of outlets of air-flow, an air pressure part enters in the path section of safe valve chamber, acts on safe piston
On, after atmospheric pressure value reaches certain numerical value, after overcoming safety spring active force, safe piston is driven to be moved towards guide sleeve, safety is living
It misplaces and is not connected between throttling pore beyond the Great Wall and annular groove；
Air inlet another part enters pressure limiting inlet chamber, enters pressure limiting outlet chamber by normally opened pressure limiting valve, then
It is discharged through 23 mouthfuls and 24 mouthfuls or through piston valve gear corresponding with 23 mouthfuls and 24 mouthfuls, realizes 23 mouthfuls and 24 mouthfuls of outlets；
After 23 mouthfuls and 24 mouthfuls of air pressures reach certain numerical value, the atmospheric pressure acted on pressure limiting piston is more than pressure limiting spring
Active force, under the action of pressure limiting piston, pressure limiting valve is shut off, at this point, air inlet not to 23 mouthfuls and 24 mouthfuls ventilate, gained
Atmospheric pressure value is just 23 mouthfuls and 24 mouthfuls of voltage limiting value；
After dying for 21 mouthfuls, i.e. 21 implications pressure is reduced to zero, and the path section air pressure of safe valve chamber at this time declines, safe piston
Under the elastic force effect of safety spring, safe piston is to the medial movement where path section, when in safe piston and central diameter section
When side contacts coordinate, throttling pore is connected with annular groove；23 implications pressure enters by annular groove and throttling pore at this time
Air is flowed into safety valve intracavitary, and from exhaust outlet, i.e., after dying for 21 mouthfuls so that 23 implications pressure also declines simultaneously, and 23 mouthfuls are
Connect parking auxiliary hand control valve, so that release air pressure and decline, spring brake chamber is realized automatic under energy storage spring effect
Driving defencive function is played in parking.
Description of the drawings
In order to keep the purpose of the present invention, technical solution and advantageous effect clearer, the present invention provides following attached drawing and carries out
Explanation：
Fig. 1 is the structural schematic diagram of Vehicular air processing unit assembly embodiment of the present invention；
Fig. 2 is the left view of Fig. 1；
Fig. 3 is the structural schematic diagram of the four-loop protection valve of the present embodiment；
Fig. 4 is the vertical view of Fig. 3；
Fig. 5 is the vertical view of Fig. 4；
Fig. 6 is the right view of Fig. 4；
Fig. 7 is the A-A sectional views of Fig. 4；
Fig. 8 is the B-B sectional views of Fig. 4；
Fig. 9 is the C-C sectional views of Fig. 5；
Figure 10 is the D-D sectional views of Fig. 4；
Figure 11 is the E-E sectional views of Fig. 4.
Reference sign：
1- valve bodies；2- air inlets；The first outlet passageways of 3-；The second outlet passageways of 4-；5- third outlet passageways；6- the 4th goes out
Gas channel；7- valve seats；8- valve chambers；The inner cavities 9-；10- exocoels；10a- aprons；11- diaphragms；12- pressing plates；13- rag iron springs；14-
Adjust pressing plate；15- adjusting screws I；16- pressure limiting valve chambers；17- pressure limiting valve decks；18- pressure limiting valves；19- pressure limiting pistons；20- pressure limitings
Inlet chamber；25- pressure limiting outlet chambers；26- pressure limiting springs；27- pressure limiting adjustable plates；28- adjusting screws II；The safe valve chambers of 29-；29a-
Major diameter section；29b- central diameter sections；29c- path sections；30- guide sleeves；The safe pistons of 31-；32- safety springs；33- intercommunicating pores；34- is arranged
Gas port；35- annular grooves；36- throttling pores；37- sealing rings；The safe adjustable plates of 38-；39- adjusting screws III；40- exhaust membranes
Piece；41- pressure sensors；42- driers.
Specific implementation mode
The invention will be further described in the following with reference to the drawings and specific embodiments, so that those skilled in the art can be with
It is better understood from the present invention and can be practiced, but illustrated embodiment is not as a limitation of the invention.
As shown in Figure 1, for the structural schematic diagram of Vehicular air processing unit assembly embodiment of the present invention.The vehicle of the present embodiment
With air conditioner unit assembly, including drier 42 and four-loop protection valve, the gas outlet of drier 42 and four-loop protection valve
Air inlet 2 be connected.
Specifically, the four-loop protection valve of the present embodiment, including valve body 1, valve body 1 are equipped with air inlet 2 and inlet channel,
It is additionally provided with 21 mouthfuls, 22 mouthfuls, 23 mouthfuls and 24 mouthfuls on valve body 1, is correspondingly provided with 21 mouthfuls, 22 mouthfuls, 23 mouthfuls and 24 mouthfuls the in valve body 1 respectively
One outlet passageway 3, the second outlet passageway 4, third outlet passageway 5 and the 4th outlet passageway 6, the first outlet passageway 3, the second outlet
It is respectively equipped with piston valve gear between channel 4, third outlet passageway 5 and the 4th outlet passageway 6 and inlet channel.Inlet channel with
The limit closed after the pressure of 23 mouthfuls and 24 mouthfuls reaches given threshold is equipped between third outlet passageway 5 and the 4th outlet passageway 6
Valve mechanism；Relief valve mechanism is equipped between third outlet passageway 5 and the first outlet passageway 3.21 mouthfuls of the present embodiment and 22 mouthfuls
It is equipped with pressure sensor 41.
Further, the piston valve gear of the present embodiment includes the valve seat 7 being fixedly mounted on valve body 1, and valve is equipped in valve seat 7
Chamber 8 is correspondingly provided with inner cavity 9 and exocoel 10 on valve body 1 with valve chamber 8, and exocoel 10 is annular chamber and is arranged around inner cavity 9, valve seat 7 with
It is equipped with diaphragm 11 between valve body 1, and is equipped in valve seat 7 for making diaphragm 11 be fitted on valve body 1 and separating inner cavity 9 and exocoel 10
Press plate mechanism.The press plate mechanism of the present embodiment includes the pressing plate 12 being slidably installed in valve chamber 8, pressing plate 12 and valve chamber 8
Between be equipped with for making pressing plate 12 be pressed on diaphragm 11 and separating the rag iron spring 13 of inner cavity 9 and exocoel 10.The present embodiment
Rag iron spring 13 is equipped with backwards to one end of pressing plate 12 adjusts pressing plate 14, and valve seat 7 is equipped with for adjusting pressing plate 14 and pressing plate
The adjusting screw I 15 of spacing and then the pre- elastic force of adjusting rag iron spring 13 between 12.Specifically, inner cavity 9 and corresponding first
Outlet passageway 3, the second outlet passageway 4, third outlet passageway 5 or the 4th outlet passageway 6 are connected, exocoel 10 and inlet channel phase
Connection；Or exocoel 10 and corresponding first outlet passageway 3, the second outlet passageway 4, third outlet passageway 5 or the 4th outlet passageway 6
It is connected, inner cavity 9 is connected with inlet channel.The inner cavity 9 of the present embodiment and corresponding first outlet passageway 3, the second outlet are logical
Road 4, third outlet passageway 5 or the 4th outlet passageway 6 are connected, and exocoel 10 is connected with inlet channel.
Further, 21 mouthfuls, 22 mouthfuls, 23 mouthfuls and 24 mouthfuls of the axis of the present embodiment is mutually parallel and the axis with air inlet 2
Line is vertical, and on 21 mouthfuls, 22 mouthfuls, the 23 mouthfuls and 24 mouthfuls the same side side walls for being arranged at valve body 1；The axis of all valve chambers 8 is equal
Valve seat 7 parallel with the axis of air inlet and vertical and all with 21 mouthfuls of axis is arranged at the same side side wall of valve body 1
On, the installation space of product can be effectively reduced so that structure is compacter.
Further, the pressure limiting valve system of the present embodiment includes that the pressure limiting valve chamber 16 being arranged in valve body 1 and lid are mounted in pressure limiting
Pressure limiting valve deck 17 on valve chamber 16；It lives equipped with pressure limiting valve 18 and the pressure limiting being fixedly connected with pressure limiting valve 18 in pressure limiting valve chamber 16
Plug 19, pressure limiting piston 19 is between pressure limiting valve 18 and pressure limiting valve deck 17.The pressure limiting valve intracavitary of the present embodiment is equipped with position respectively
Pressure limiting inlet chamber 20 and pressure limiting outlet chamber 25 in 18 both sides of pressure limiting valve, pressure limiting inlet chamber 20 are located at pressure limiting valve 18 backwards to limit
The side of piston 19 is pressed, pressure limiting outlet chamber 25 is between pressure limiting valve 18 and pressure limiting piston 19.The pressure limiting piston of the present embodiment
It is equipped between 19 and pressure limiting valve deck 17 and is set for making pressure limiting valve 18 keep it turned on and reach in the pressure of 23 mouthfuls and 24 mouthfuls
Determine the limiting mechanism of pressure closed after threshold value.Specifically, pressure limiting inlet chamber 20 is connected with inlet channel, it is corresponding with 23 mouthfuls and 24 mouthfuls to set
The inlet end for the piston valve gear set is connected with pressure limiting outlet chamber 25；Or with 23 mouthfuls and 24 mouthfuls of piston valve gears being correspondingly arranged
Outlet side be connected with pressure limiting inlet chamber 20, third outlet passageway 5 and the 4th outlet passageway 6 respectively with 25 phase of pressure limiting outlet chamber
Connection.The pressure limiting inlet chamber 20 of the present embodiment is connected with inlet channel, with 23 mouthfuls and 24 mouthfuls of piston valve gears being correspondingly arranged
Inlet end be connected with pressure limiting outlet chamber 25, i.e., with the exocoel of the 23 mouthfuls and 24 mouthfuls piston valve gears being correspondingly arranged 10 and pressure limiting
Outlet chamber 25 is connected.The pressure limiting outlet chamber 25 of the present embodiment passes through the A chambers and B chambers and corresponding exocoel 10 that are arranged in valve body
The bottom of connection, the exocoel 10 is equipped with apron 10a.
Further, the limiting mechanism of pressure of the present embodiment includes the pressure limiting bullet being arranged between pressure limiting piston 19 and pressure limiting valve deck 17
Spring 26.The one end of pressure limiting spring 26 towards pressure limiting valve deck 17 is equipped with pressure limiting adjustable plate 27, is used to adjust pressure limiting on pressure limiting valve deck 17
The adjusting screw II 28 of spacing and then the pre- elastic force of adjusting pressure limiting spring 26 between adjustable plate 27 and pressure limiting piston 19.This reality
The axis for applying the pressure limiting valve chamber 16 of example is vertical with the axis of air inlet 2, and the axis of pressure limiting valve chamber 16 is vertical with 21 mouthfuls of axis.
Further, the relief valve mechanism of the present embodiment includes the safe valve chamber 29 being arranged in valve body 1, and safe valve chamber 29 wraps
Major diameter section 29a, central diameter section 29b and path section 29c are included, central diameter section 29b is between major diameter section 29a and path section 29c, major diameter section
29b is located at the outside of central diameter section 29b；The internal diameter of major diameter section 29a is more than the internal diameter of central diameter section 29b, and the internal diameter of central diameter section 29b is more than
The internal diameter of path section 29c.Guide sleeve 30, inner side end of the guide sleeve 30 towards 29 bottom of chamber of safe valve chamber are fixed in major diameter section 29a
It is equipped with the internal diameter guide hole equal with central diameter section 29b, the safe piston 31 being slidably matched with it, safety are equipped in central diameter section 29b
The outer end of piston 31 extend into guide hole and is slidably matched with guide hole.One end end face of the safe piston 31 towards guide sleeve 30 is equipped with
Blind hole is equipped with the inside for making safe piston 31 and central diameter section 29b in a free state between the bottom hole of blind hole and the bottom hole of guide hole
The safety spring 32 that end face is engaged.Annular chamber, the side wall of guide hole are formed between 30 periphery wall of guide sleeve and major diameter section 29b inner walls
It is equipped with the intercommunicating pore 33 that is connected with annular chamber, valve body 1 is equipped with the exhaust outlet 34 being connected with annular chamber, on exhaust outlet 34
Equipped with exhaust diaphragm 40.The inner wall of central diameter section 29b is equipped with annular groove 35, and the side wall of blind hole is equipped with throttling pore 36, and
When the inner side end of safe piston 31 and central diameter section 29b is engaged, throttling pore 36 is connected to annular groove 35, and annular is recessed
Be connected by C chambers and D chambers between slot 35 and third exhaust passage 5, between path section 29c and first exhaust passage 3 by E and
F chambers are connected.
Further, it is equipped with and is located in annular groove 35 between the safe piston 31 of the present embodiment and the inner wall of central diameter section 29b
The sealing ring 37 of side；It is equipped in guide hole and extends radially inwardly annular protrusion, the internal diameter of annular protrusion is less than the outer of safe piston 31
Diameter, and when the inner side end of safe piston 31 and central diameter section 29b is engaged, axial direction of the safe piston 31 apart from annular protrusion
Distance is more than axial distance of the throttling pore 36 apart from sealing ring 37, i.e., when safe piston 31 and annular protrusion are engaged,
Throttling pore 36 is located at the outside of sealing ring 37, and throttling pore 36 is not connected with annular groove 35.
Further, the safety spring 32 of the present embodiment is equipped with safe adjustable plate 38 towards the outer end of guide sleeve 30, on guide sleeve 30
Equipped with the adjusting screw III 39 for adjusting the spacing between safe adjustable plate 38 and safe piston 31, you can adjust safety spring
32 pre- elastic force.The axis of the safe valve chamber 29 of the present embodiment is parallel with 21 mouthfuls of axis, and the axis of safe valve chamber 29 is simultaneously
It is vertical with the axis of air inlet 2 and valve chamber 8.
The four-loop protection valve of the present embodiment, by between inlet channel and third outlet passageway and the 4th outlet passageway
Pressure limiting valve system is set, can close pressure limiting valve system after the pressure of 23 mouthfuls and 24 mouthfuls reaches given threshold, realize 23 mouthfuls and 24
Mouthful pressure limiting, the pressure in 23 mouthfuls and 24 mouthfuls is the voltage limiting value of 23 mouthfuls and 24 mouthfuls at this time；By third outlet passageway with it is described
Relief valve mechanism is set between first outlet passageway, after dying for 21 mouthfuls, it can be ensured that 23 mouthfuls of air pressure also declines, and 23 mouthfuls external
Parking assists hand control valve, so that releases air pressure and declines, spring brake chamber under energy storage spring effect, stay automatically by realization
Vehicle plays driving defencive function；To sum up, in the external pressure limiting valve of peripheral hardware and check valve, i.e., four-loop protection valve of the invention does not have to
23 mouthfuls and 24 mouthfuls of pressure limitings and back flow protection function can be achieved.
Specifically, the principle of the Vehicular air processing unit assembly of the present embodiment is as follows：
The gas that mouth is handled through drier enters from air inlet, and a part reaches exocoel/inner cavity, acts on diaphragm and pressing plate
On, after active force is more than the active force of rag iron spring, piston valve gear is opened, and air pressure reaches inner cavity/exocoel, from 21 mouthfuls and 22
Mouth outlet；By in 21 mouthfuls and 22 mouthfuls of setting pressure sensors, can directly can in real time be monitored by pressure sensor 21 mouthfuls and
22 implication pressures judge pressure value convenient for vehicle；
While 21 mouthfuls of outlets of air-flow, an air pressure part enters in the path section of safe valve chamber, acts on safe piston
On, after atmospheric pressure value reaches certain numerical value, after overcoming safety spring active force, safe piston is driven to be moved towards guide sleeve, safety is living
It misplaces and is not connected between throttling pore beyond the Great Wall and annular groove；
Air inlet another part enters pressure limiting inlet chamber, enters pressure limiting outlet chamber by normally opened pressure limiting valve, then
It is discharged through 23 mouthfuls and 24 mouthfuls or through piston valve gear corresponding with 23 mouthfuls and 24 mouthfuls, realizes 23 mouthfuls and 24 mouthfuls of outlets；
After 23 mouthfuls and 24 mouthfuls of air pressures reach certain numerical value, the atmospheric pressure acted on pressure limiting piston is more than pressure limiting spring
Active force, under the action of pressure limiting piston, pressure limiting valve is shut off, at this point, air inlet not to 23 mouthfuls and 24 mouthfuls ventilate, gained
Atmospheric pressure value is just 23 mouthfuls and 24 mouthfuls of voltage limiting value；
After dying for 21 mouthfuls, i.e. 21 implications pressure is reduced to zero, and the path section air pressure of safe valve chamber at this time declines, safe piston
Under the elastic force effect of safety spring, safe piston is to the medial movement where path section, when in safe piston and central diameter section
When side contacts coordinate, throttling pore is connected with annular groove；23 implications pressure enters by annular groove and throttling pore at this time
Air is flowed into safety valve intracavitary, and from exhaust outlet, i.e., after dying for 21 mouthfuls so that 23 implications pressure also declines simultaneously, and 23 mouthfuls are
Connect parking auxiliary hand control valve, so that release air pressure and decline, spring brake chamber is realized automatic under energy storage spring effect
Driving defencive function is played in parking.
Embodiment described above is only to absolutely prove preferred embodiment that is of the invention and being lifted, protection model of the invention
It encloses without being limited thereto.Those skilled in the art on the basis of the present invention made by equivalent substitute or transformation, in the present invention
Protection domain within.Protection scope of the present invention is subject to claims.
Claims (18)
1. a kind of four-loop protection valve, including valve body (1), the valve body (1) is equipped with air inlet (2) and inlet channel, described
Be additionally provided with 21 mouthfuls, 22 mouthfuls, 23 mouthfuls and 24 mouthfuls on valve body (1), in the valve body (1) with described 21 mouthfuls, 22 mouthfuls, 23 mouthfuls and 24 mouthfuls points
It is not correspondingly provided with the first outlet passageway (3), the second outlet passageway (4), third outlet passageway (5) and the 4th outlet passageway (6), institute
State the first outlet passageway (3), the second outlet passageway (4), third outlet passageway (5) and the 4th outlet passageway (6) and the air inlet
Piston valve gear is respectively equipped between channel；It is characterized in that：
It is equipped between the inlet channel and the third outlet passageway (5) and the 4th outlet passageway (6) and works as described 23 mouthfuls and 24
The pressure of mouth reaches the pressure limiting valve system closed after given threshold；The third outlet passageway (5) and first outlet passageway
(3) relief valve mechanism is equipped between.
2. four-loop protection valve according to claim 1, it is characterised in that：Described 21 mouthfuls and 22 mouthfuls are equipped with pressure sensing
Device (41).
3. four-loop protection valve according to claim 1, it is characterised in that：The piston valve gear includes being fixedly mounted on
Valve seat (7) on the valve body (1), is equipped with valve chamber (8) in the valve seat (7), right with the valve chamber (8) on the valve body (1)
It should be equipped with inner cavity (9) and exocoel (10), the exocoel (10) is annular chamber and is arranged around the inner cavity (9), the valve seat (7)
It is equipped with diaphragm (11) between the valve body (1), and is equipped in the valve seat (7) described for making the diaphragm (11) be fitted in
On valve body (1) and separate the press plate mechanism of the inner cavity (9) and exocoel (10).
4. four-loop protection valve according to claim 3, it is characterised in that：The press plate mechanism includes being slidably installed
Pressing plate (12) in the valve chamber (8) is equipped between the pressing plate (12) and the valve chamber (8) for making the pressing plate
(12) it is pressed on the diaphragm (11) and separates the rag iron spring (13) of the inner cavity (9) and exocoel (10).
5. four-loop protection valve according to claim 4, it is characterised in that：The rag iron spring (13) is backwards to the pressing plate
(12) one end, which is equipped with, adjusts pressing plate (14), and the valve seat (7) is equipped with for adjusting the adjusting pressing plate (14) and the pressure
The adjusting screw I (15) of spacing and then the pre- elastic force of the adjusting rag iron spring (13) between plate (12).
6. four-loop protection valve according to claim 1, it is characterised in that：Described 21 mouthfuls, 22 mouthfuls, 23 mouthfuls and 24 mouthfuls of axis
Line is mutually parallel and vertical with the axis of the air inlet (2), and described 21 mouthfuls, 22 mouthfuls, 23 mouthfuls and 24 mouthfuls are arranged at institute
On the same side side wall for stating valve body (1)；The axis of all valve chambers (8) it is parallel with the axis of the air inlet and with institute
State that 21 mouthfuls of axis is vertical, and all valve seats (7) are arranged on the same side side wall of the valve body (1).
7. according to claim 2-6 any one of them four-loop protection valves, it is characterised in that：The inner cavity (9) with it is corresponding
First outlet passageway (3), the second outlet passageway (4), third outlet passageway (5) or the 4th outlet passageway (6) are connected, institute
Exocoel (10) is stated with the inlet channel to be connected；Or the exocoel (10) and corresponding first outlet passageway (3), second
Outlet passageway (4), third outlet passageway (5) or the 4th outlet passageway (6) are connected, the inner cavity (9) and the inlet channel
It is connected.
8. according to claim 1-5 any one of them four-loop protection valves, it is characterised in that：The pressure limiting valve system includes setting
Set the pressure limiting valve deck (17) of pressure limiting valve chamber (16) and lid on the pressure limiting valve chamber (16) in the valve body (1)；It is described
It is described equipped with pressure limiting valve (18) and the pressure limiting piston (19) being fixedly connected with the pressure limiting valve (18) in pressure limiting valve chamber (16)
Pressure limiting piston (19) is between the pressure limiting valve (18) and the pressure limiting valve deck (17)；
The pressure limiting valve intracavitary is equipped with the pressure limiting inlet chamber (20) and pressure limiting outlet for being located at pressure limiting valve (18) both sides
Chamber (25), the pressure limiting inlet chamber (20) is located at side of the pressure limiting valve (18) backwards to the pressure limiting piston (19), described
Pressure limiting outlet chamber (25) is between the pressure limiting valve (18) and pressure limiting piston (19)；
It is equipped between the pressure limiting piston (19) and the pressure limiting valve deck (17) for making the pressure limiting valve (18) keep it turning on
State simultaneously reaches the limiting mechanism of pressure closed after given threshold in the pressure of described 23 mouthfuls and 24 mouthfuls.
9. four-loop protection valve according to claim 8, it is characterised in that：The limiting mechanism of pressure includes being arranged in the limit
Press the pressure limiting spring (26) between piston (19) and the pressure limiting valve deck (17).
10. four-loop protection valve according to claim 9, it is characterised in that：The pressure limiting spring (26) is towards the limit
One end of pressure valve lid (17) is equipped with pressure limiting adjustable plate (27), is used to adjust the pressure limiting adjustable plate on the pressure limiting valve deck (17)
(27) adjusting screw II of the pre- elastic force of the spacing between the pressure limiting piston (19) and then the adjusting pressure limiting spring (26)
(28)。
11. four-loop protection valve according to claim 8, it is characterised in that：The pressure limiting inlet chamber (20) with it is described into
Gas channel is connected, inlet end and the pressure limiting outlet chamber of the piston valve gear being correspondingly arranged with described 23 mouthfuls and 24 mouthfuls
(25) it is connected；Or with the outlet side of the 23 mouthfuls and 24 mouthfuls piston valve gears being correspondingly arranged and the pressure limiting inlet chamber (20)
It is connected, the third outlet passageway (5) and the 4th outlet passageway (6) are connected with the pressure limiting outlet chamber (25) respectively.
12. four-loop protection valve according to claim 8, it is characterised in that：The axis of the pressure limiting valve chamber (16) and institute
The axis for stating air inlet (2) is vertical, and the axis of the pressure limiting valve chamber (16) is vertical with 21 mouthfuls of the axis.
13. according to claim 1-6 any one of them four-loop protection valves, it is characterised in that：The relief valve mechanism includes
The safe valve chamber (29) being arranged in the valve body (1), the safe valve chamber (29) include major diameter section (29a), central diameter section (29b)
With path section (29c), the central diameter section (29b) is described big between the major diameter section (29a) and the path section (29c)
Diameter section (29b) is located at the outside of the central diameter section (29b)；The internal diameter of the major diameter section (29a) is more than the central diameter section (29b)
Internal diameter, the internal diameter of the central diameter section (29b) are more than the internal diameter of the path section (29c)；
It is fixed with guide sleeve (30) in the major diameter section (29a), the guide sleeve (30) is towards safe valve chamber (29) bottom of chamber
Inner side end is equipped with the internal diameter guide hole equal with central diameter section (29b), is equipped with to slide with it in the central diameter section (29b) and match
The outer end of the safe piston (31) closed, the safe piston (31) extend into the guide hole and is slidably matched with the guide hole；
One end end face of the safe piston (31) towards the guide sleeve (30) be equipped with blind hole, the bottom hole of the blind hole with it is described
Being equipped between the bottom hole of guide hole in a free state connects the safe piston (31) and the inner side end of the central diameter section (29b)
Touch the safety spring (32) of cooperation；
Annular chamber is formed between guide sleeve (30) periphery wall and the major diameter section (29b) inner wall, is set on the side wall of the guide hole
There are the intercommunicating pore (33) being connected with the annular chamber, the valve body (1) to be equipped with the exhaust outlet being connected with the annular chamber
(34)；
The inner wall of the central diameter section (29b) is equipped with annular groove (35), and the side wall of the blind hole is equipped with throttling pore (36),
And when the inner side end of the safe piston (31) and the central diameter section (29b) is engaged, the throttling pore (36) with
Annular groove (35) connection, the annular groove (35) are connected with the third exhaust passage (5), the path section
(29c) is connected with the first exhaust passage (3).
14. four-loop protection valve according to claim 13, it is characterised in that：The safe piston (31) and the central diameter
The sealing ring (37) being located on the inside of the annular groove (35) is equipped between the inner wall of section (29b)；It is equipped in the guide hole radial
Extend internally annular protrusion, and the internal diameter of the annular protrusion is less than the outer diameter of the safe piston (31), and living in the safety
When plug (31) and the inner side end of the central diameter section (29b) are engaged, the safe piston (31) is apart from the annular protrusion
Axial distance be more than axial distance of the throttling pore (36) apart from the sealing ring (37).
15. four-loop protection valve according to claim 13, it is characterised in that：The safety spring (32) is led towards described
Cover (30) outer end be equipped with safe adjustable plate (38), the guide sleeve (30) be equipped with for adjust the safe adjustable plate (38) with
The adjusting screw III (39) of spacing between the safe piston (31).
16. four-loop protection valve according to claim 13, it is characterised in that：The exhaust outlet (34) is equipped with exhaust membrane
Piece (40).
17. four-loop protection valve according to claim 13, it is characterised in that：The axis of the safe valve chamber (29) and institute
State that 21 mouthfuls of axis is parallel, and the axis of the safe valve chamber (29) is vertical with the axis of the air inlet (2) and valve chamber (8) simultaneously
Directly.
18. a kind of Vehicular air processing unit assembly, it is characterised in that：Including drier (42) and as claim 1-17 is any
Four-loop protection valve described in, the gas outlet of the drier (42) is connected with the air inlet (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810601329.1A CN108437964B (en) | 2018-06-12 | 2018-06-12 | Air treatment unit assembly for vehicle and four-loop protection valve thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810601329.1A CN108437964B (en) | 2018-06-12 | 2018-06-12 | Air treatment unit assembly for vehicle and four-loop protection valve thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108437964A true CN108437964A (en) | 2018-08-24 |
| CN108437964B CN108437964B (en) | 2024-01-16 |
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ID=63206164
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810601329.1A Active CN108437964B (en) | 2018-06-12 | 2018-06-12 | Air treatment unit assembly for vehicle and four-loop protection valve thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110149740A (en) * | 2019-06-17 | 2019-08-20 | 郭康宁 | A kind of glass for vehicle window is anti-to haze and device and anti-hazes and Defrost method |
| CN111907506A (en) * | 2020-08-18 | 2020-11-10 | 湖北力美制动元件有限公司 | Multi-loop protection valve for automobile braking system |
| CN113715792A (en) * | 2021-08-27 | 2021-11-30 | 东风汽车股份有限公司 | Four-loop protection valve with partial loop having pressure limiting function |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204956459U (en) * | 2015-07-22 | 2016-01-13 | 十堰市华迪汽车零部件有限公司 | Four automobile -used return circuit protective valves reach rather than integrated desicator assembly |
| CN105365803A (en) * | 2015-12-10 | 2016-03-02 | 瑞立集团瑞安汽车零部件有限公司 | Six-loop protection valve |
| CN205186132U (en) * | 2015-12-10 | 2016-04-27 | 瑞立集团瑞安汽车零部件有限公司 | Six return circuit protective valves |
| CN205706659U (en) * | 2016-06-28 | 2016-11-23 | 浙江万安科技股份有限公司 | A kind of automobile four-loop protection valve |
| CN106314412A (en) * | 2016-08-31 | 2017-01-11 | 瑞立集团瑞安汽车零部件有限公司 | Electronic control air handling unit with the function of C A N |
| CN208630593U (en) * | 2018-06-12 | 2019-03-22 | 浙江万安科技股份有限公司 | Vehicular air processing unit assembly and its four-loop protection valve |
-
2018
- 2018-06-12 CN CN201810601329.1A patent/CN108437964B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204956459U (en) * | 2015-07-22 | 2016-01-13 | 十堰市华迪汽车零部件有限公司 | Four automobile -used return circuit protective valves reach rather than integrated desicator assembly |
| CN105365803A (en) * | 2015-12-10 | 2016-03-02 | 瑞立集团瑞安汽车零部件有限公司 | Six-loop protection valve |
| CN205186132U (en) * | 2015-12-10 | 2016-04-27 | 瑞立集团瑞安汽车零部件有限公司 | Six return circuit protective valves |
| CN205706659U (en) * | 2016-06-28 | 2016-11-23 | 浙江万安科技股份有限公司 | A kind of automobile four-loop protection valve |
| CN106314412A (en) * | 2016-08-31 | 2017-01-11 | 瑞立集团瑞安汽车零部件有限公司 | Electronic control air handling unit with the function of C A N |
| CN208630593U (en) * | 2018-06-12 | 2019-03-22 | 浙江万安科技股份有限公司 | Vehicular air processing unit assembly and its four-loop protection valve |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110149740A (en) * | 2019-06-17 | 2019-08-20 | 郭康宁 | A kind of glass for vehicle window is anti-to haze and device and anti-hazes and Defrost method |
| CN110149740B (en) * | 2019-06-17 | 2024-02-20 | 郭康宁 | Anti-fogging device for car window glass and anti-fogging and defrosting method |
| CN111907506A (en) * | 2020-08-18 | 2020-11-10 | 湖北力美制动元件有限公司 | Multi-loop protection valve for automobile braking system |
| CN113715792A (en) * | 2021-08-27 | 2021-11-30 | 东风汽车股份有限公司 | Four-loop protection valve with partial loop having pressure limiting function |
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