CN108437964B - Air treatment unit assembly for vehicle and four-loop protection valve thereof - Google Patents
Air treatment unit assembly for vehicle and four-loop protection valve thereof Download PDFInfo
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- CN108437964B CN108437964B CN201810601329.1A CN201810601329A CN108437964B CN 108437964 B CN108437964 B CN 108437964B CN 201810601329 A CN201810601329 A CN 201810601329A CN 108437964 B CN108437964 B CN 108437964B
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- 230000007246 mechanism Effects 0.000 claims abstract description 51
- 238000007789 sealing Methods 0.000 claims description 7
- 238000004891 communication Methods 0.000 claims description 4
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 claims 1
- 238000004146 energy storage Methods 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 239000012528 membrane Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 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
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- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Safety Valves (AREA)
Abstract
The invention discloses a four-loop protection valve, which comprises a valve body, wherein an air inlet and an air inlet channel are arranged on the valve body, 21 ports, 22 ports, 23 ports and 24 ports are also arranged on the valve body, a first air outlet channel, a second air outlet channel, a third air outlet channel and a fourth air outlet channel are respectively and correspondingly arranged in the valve body with the 21 ports, the 22 ports, the 23 ports and the 24 ports, and piston valve mechanisms are respectively arranged between the first air outlet channel, the second air outlet channel, the third air outlet channel and the fourth air outlet channel and the air inlet channel; a pressure limiting valve mechanism which is closed after the pressures of the 23 ports and the 24 ports reach a set threshold value is arranged between the air inlet channel and the third air outlet channel and between the air inlet channel and the fourth air outlet channel; and a safety valve mechanism is arranged between the third air outlet channel and the first air outlet channel. The invention also discloses an air treatment unit assembly for the vehicle, which comprises a dryer and the four-loop protection valve, wherein an air outlet of the dryer is communicated with the air inlet.
Description
Technical Field
The invention belongs to the technical field of vehicle brake control systems and components thereof, and particularly relates to a vehicle air treatment unit assembly and a four-loop protection valve thereof.
Background
The four-loop protection valve (hereinafter referred to as four-protection valve) is formed by arranging a plurality of pressure limiting check valves (usually four) according to a certain relation, and other functional mechanisms are added partially and properly so as to realize the shunt supply of an air source in the commercial vehicle brake system and ensure that each loop independently and normally works. The four-protection valve has the function that when one loop fails in the gas brake system, the four-protection valve can prevent the inflation and the air supply of other loops from being influenced. The four-loop protection valve divides the whole vehicle air path into four loops which are mutually connected and independent, and when any loop fails (such as break and leak), the normal work and inflation of other loops are not affected. Under normal conditions, the four-loop protection valve is actually a five-way joint, and only plays a role in protection when a certain loop breaks and leaks.
Although the existing four-loop protection valve can meet the use requirement to a certain extent, the following disadvantages still exist:
1. in the prior art, the installation surfaces of the 21, 22, 23 and 24 ports of the four-protection valve are not on the same plane, so that the installation space size of the whole product is large;
2. the 23-port and 24-port infinite pressure functions of the existing four-protection valve require an external pressure limiting valve to limit pressure;
3. the existing four-protection valve has no pressure monitoring function at the 21 ports and the 22 ports, and the pressure can be monitored only by externally connecting a pressure sensor;
4. the existing reflux protection function between the 21 and 23 ports of the four-protection valve is controlled by a one-way valve, and the flow rate and the pressure value are not accurate enough.
Disclosure of Invention
In view of the above, the present invention aims to overcome the defects in the prior art, and to provide an air handling unit assembly for a vehicle and a four-circuit protection valve thereof.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the invention firstly provides a four-loop protection valve, which comprises a valve body, wherein an air inlet and an air inlet channel are arranged on the valve body, 21, 22, 23 and 24 ports are also arranged on the valve body, a first air outlet channel, a second air outlet channel, a third air outlet channel and a fourth air outlet channel are respectively and correspondingly arranged in the valve body with the 21, 22, 23 and 24 ports, and piston valve mechanisms are respectively arranged between the first air outlet channel, the second air outlet channel, the third air outlet channel and the fourth air outlet channel and the air inlet channel;
a pressure limiting valve mechanism which is closed after the pressures of the 23 ports and the 24 ports reach a set threshold value is arranged between the air inlet channel and the third air outlet channel and between the air inlet channel and the fourth air outlet channel; a safety valve mechanism is arranged between the third air outlet channel and the first air outlet channel, the safety valve mechanism comprises a safety valve cavity arranged in the valve body, the safety valve cavity comprises a large-diameter section, a middle-diameter section and a small-diameter section, the middle-diameter section is positioned between the large-diameter section and the small-diameter section, and the large-diameter section is positioned at the outer side of the middle-diameter section; the inner diameter of the large-diameter section is larger than that of the middle-diameter section, and the inner diameter of the middle-diameter section is larger than that of the small-diameter section.
Further, pressure sensors are arranged on the 21 ports and the 22 ports.
Further, the piston valve mechanism comprises a valve seat fixedly mounted on the valve body, a valve cavity is arranged in the valve seat, an inner cavity and an outer cavity are arranged on the valve body corresponding to the valve cavity, the outer cavity is an annular cavity and surrounds the inner cavity, a diaphragm is arranged between the valve seat and the valve body, and a pressing plate mechanism used for enabling the diaphragm to be attached to the valve body and isolating the inner cavity and the outer cavity is arranged in the valve seat.
Further, the pressing plate mechanism comprises a pressing plate which is installed in the valve cavity in a sliding fit mode, and a pressing plate spring which is used for enabling the pressing plate to press the diaphragm and isolating the inner cavity and the outer cavity is arranged between the pressing plate and the valve cavity.
Further, one end of the pressing plate spring, which is opposite to the pressing plate, is provided with an adjusting pressing plate, and an adjusting screw I used for adjusting the distance between the adjusting pressing plate and the pressing plate and further adjusting the pre-elasticity of the pressing plate spring is arranged on the valve seat.
Further, the axes of the 21 mouth, the 22 mouth, the 23 mouth and the 24 mouth are mutually parallel and perpendicular to the axis of the air inlet, and the 21 mouth, the 22 mouth, the 23 mouth and the 24 mouth are all arranged on the same side wall of the valve body; all the axes of the valve cavities are parallel to the axis of the air inlet and perpendicular to the axis of the 21 ports, and all the valve seats are arranged on the same side wall of the valve body.
Further, the inner cavity is communicated with the corresponding first air outlet channel, second air outlet channel, third air outlet channel or fourth air outlet channel, and the outer cavity is communicated with the air inlet channel; or the outer cavity is communicated with the corresponding first air outlet channel, second air outlet channel, third air outlet channel or fourth air outlet channel, and the inner cavity is communicated with the air inlet channel.
Further, the pressure limiting valve mechanism comprises a pressure limiting valve cavity arranged in the valve body and a pressure limiting valve cover covered on the pressure limiting valve cavity; the pressure limiting valve cavity is internally provided with a pressure limiting valve and a pressure limiting piston fixedly connected with the pressure limiting valve, and the pressure limiting piston is positioned between the pressure limiting valve and the pressure limiting valve cover;
the pressure limiting valve cavity is internally provided with a pressure limiting air inlet cavity and a pressure limiting air outlet cavity which are respectively positioned at two sides of the pressure limiting valve, the pressure limiting air inlet cavity is positioned at one side of the pressure limiting valve, which is opposite to the pressure limiting piston, and the pressure limiting air outlet cavity is positioned between the pressure limiting valve and the pressure limiting piston;
and a pressure limiting mechanism used for keeping the pressure limiting valve in an open state and closing after the pressures of the 23 ports and the 24 ports reach a set threshold value is arranged between the pressure limiting piston and the pressure limiting valve cover.
Further, the pressure limiting mechanism includes a pressure limiting spring disposed between the pressure limiting piston and the pressure limiting valve cover.
Further, a pressure limiting adjusting plate is arranged at one end, facing the pressure limiting valve cover, of the pressure limiting spring, and an adjusting screw II used for adjusting the distance between the pressure limiting adjusting plate and the pressure limiting piston and further adjusting the pre-elastic force of the pressure limiting spring is arranged on the pressure limiting valve cover.
Further, the pressure-limiting air inlet cavity is communicated with the air inlet channel, and the air inlet end of the piston valve mechanism corresponding to the 23 ports and the 24 ports is communicated with the pressure-limiting air outlet cavity; or the air outlet end of the piston valve mechanism which is arranged corresponding to the 23 ports and the 24 ports is communicated with the pressure-limiting air inlet cavity, and the third air outlet channel and the fourth air outlet channel are respectively communicated with the pressure-limiting air outlet cavity.
Further, the axis of the pressure limiting valve cavity is perpendicular to the axis of the air inlet, and the axis of the pressure limiting valve cavity is perpendicular to the axis of the 21-port.
Further, a guide sleeve is fixedly arranged in the large-diameter section, a guide hole with the inner diameter equal to that of the middle-diameter section is formed in the inner end face, facing the bottom of the safety valve cavity, of the guide sleeve, a safety piston in sliding fit with the middle-diameter section is arranged in the middle-diameter section, and the outer end of the safety piston extends into the guide hole and is in sliding fit with the guide hole;
a blind hole is formed in the end face, facing the guide sleeve, of the safety piston, and a safety spring which enables the safety piston to be in contact fit with the inner side end face of the intermediate diameter section in a free state is arranged between the bottom of the blind hole and the bottom of the guide hole;
an annular cavity is formed between the outer peripheral wall of the guide sleeve and the inner wall of the large-diameter section, a communication hole communicated with the annular cavity is formed in the side wall of the guide hole, and an exhaust port communicated with the annular cavity is formed in the valve body;
the inner wall of the intermediate diameter section is provided with an annular groove, the side wall of the blind hole is provided with a throttling small hole, and when the safety piston is in contact fit with the inner side end face of the intermediate diameter section, the throttling small hole is communicated with the annular groove, the annular groove is communicated with the third air outlet channel, and the small diameter section is communicated with the first air outlet channel.
Further, a sealing ring positioned at the inner side of the annular groove is arranged between the safety piston and the inner wall of the middle diameter section; the guide hole is internally provided with a radial inward extending annular bulge, the inner diameter of the annular bulge is smaller than the outer diameter of the safety piston, and when the safety piston is in contact fit with the inner side end surface of the middle diameter section, the axial distance between the safety piston and the annular bulge is larger than the axial distance between the throttling small hole and the sealing ring.
Further, a safety adjusting plate is arranged at the outer end of the safety spring facing the guide sleeve, and an adjusting screw III for adjusting the distance between the safety adjusting plate and the safety piston is arranged on the guide sleeve.
Further, an exhaust diaphragm is arranged on the exhaust port.
Further, the axis of the safety valve cavity is parallel to the axis of the 21 ports, and the axis of the safety valve cavity is perpendicular to the axes of the air inlet and the valve cavity at the same time.
The invention also provides an air treatment unit assembly for the vehicle, which comprises a dryer and the four-loop protection valve, wherein an air outlet of the dryer is communicated with the air inlet.
The invention has the beneficial effects that:
according to the four-loop protection valve, the pressure limiting valve mechanism is arranged between the air inlet channel and the third air outlet channel and the fourth air outlet channel, and can be closed after the pressures of the 23 ports and the 24 ports reach the set threshold value, so that the pressure limiting of the 23 ports and the 24 ports is realized, and the pressures in the 23 ports and the 24 ports are the pressure limiting values of the 23 ports and the 24 ports; through setting up the relief valve mechanism between third air outlet channel and said first air outlet channel, after 21 mouths are cut off, can ensure 23 mouths of air pressures drop too, 23 mouths connect the auxiliary manual valve of parking, make relieve the air pressure drop like this, the spring brake air chamber realizes the automatic parking under the function of energy storage spring, play a role in driving protection; in conclusion, the four-loop protection valve can realize 23-port and 24-port pressure limiting and backflow protection functions without externally connecting a pressure limiting valve and a one-way valve.
Specifically, the principle of the vehicle air treatment unit assembly of the invention is as follows:
the air passing through the treatment port of the dryer enters from the air inlet, part of the air reaches the outer cavity/inner cavity, acts on the diaphragm and the pressing plate, and after the acting force is larger than the acting force of the pressing plate spring, the piston valve mechanism is opened, the air pressure reaches the inner cavity/outer cavity, and the air is discharged from the 21 ports and the 22 ports; by arranging the pressure sensors at the 21-mouth and the 22-mouth, the pressure sensor can be used for monitoring the air pressure of the 21-mouth and the 22-mouth in real time, so that the pressure value can be conveniently judged by the whole vehicle;
when the air flow 21 is exhausted, a part of air pressure enters a small-diameter section of the safety valve cavity and acts on the safety piston, after the air pressure value reaches a certain value, the safety piston is driven to move towards the guide sleeve after overcoming the acting force of the safety spring, and the throttle small hole on the safety piston is not communicated with the annular groove in a dislocation way;
the other part of the air inlet enters a pressure-limiting air inlet cavity, enters a pressure-limiting air outlet cavity through a normally-open pressure-limiting valve, and is discharged through 23 ports and 24 ports or through piston valve mechanisms corresponding to the 23 ports and 24 ports, so that 23 ports and 24 ports are discharged;
when the air pressure of the 23 mouth and the 24 mouth reaches a certain value, the air pressure acting on the pressure limiting piston is larger than the acting force of the pressure limiting spring, the pressure limiting valve is closed under the action of the pressure limiting piston, and at the moment, the air inlet does not ventilate the 23 mouth and the 24 mouth, and the obtained air pressure value is the pressure limiting value of the 23 mouth and the 24 mouth;
when the 21 mouth is out of air, namely the pressure of the 21 mouth is reduced to zero, the air pressure of the small diameter section of the safety valve cavity is reduced, the safety piston moves towards the inner side of the small diameter section under the action of the elastic force of the safety spring, and when the safety piston is in contact fit with the inner side of the middle diameter section, the throttling small hole is communicated with the annular groove; at this moment, 23 air pressures enter the safety valve cavity through the annular groove and the throttling small hole and flow into the atmosphere from the exhaust port, namely, after 21 air vents, the 23 air pressures are simultaneously reduced, and 23 air pressures are connected with the parking auxiliary manual control valve, so that the release air pressure is reduced, the spring brake air chamber realizes automatic parking under the action of the energy storage spring, and the driving protection function is realized.
Drawings
In order to make the objects, technical solutions and advantageous effects of the present invention more clear, the present invention provides the following drawings for description:
FIG. 1 is a schematic view of an embodiment of an air handling unit assembly for a vehicle according to the present invention;
FIG. 2 is a left side view of FIG. 1;
fig. 3 is a schematic structural view of the four-circuit protection valve of the present embodiment;
FIG. 4 is a top view of FIG. 3;
FIG. 5 is a top view of FIG. 4;
FIG. 6 is a right side view of FIG. 4;
FIG. 7 is a cross-sectional view A-A of FIG. 4;
FIG. 8 is a cross-sectional view B-B of FIG. 4;
FIG. 9 is a cross-sectional view of C-C of FIG. 5;
FIG. 10 is a D-D sectional view of FIG. 4;
fig. 11 is a sectional view of E-E of fig. 4.
Reference numerals illustrate:
1-a valve body; 2-air inlet; 3-a first outlet channel; 4-a second outlet channel; 5-a third air outlet channel; 6-a fourth air outlet channel; 7-valve seat; 8-valve cavity; 9-inner cavity; 10-an outer cavity; 10 A-Apron; 11-a membrane; 12-pressing plates; 13-a platen spring; 14-adjusting the pressing plate; 15-adjusting screw I; 16-a pressure limiting valve chamber; 17-a pressure limiting valve cover; 18-a pressure limiting valve; 19-a pressure limiting piston; 20-limiting pressure air inlet cavity; 25-limiting the air outlet cavity; 26-a pressure limiting spring; 27-a pressure limiting adjusting plate; 28-adjusting screw II; 29-a safety valve cavity; 29 a-large diameter section; 29 b-pitch diameter section; 29 c-a small diameter section; 30-guiding sleeve; 31-a safety piston; 32-a safety spring; 33-communicating holes; 34-exhaust port; 35-an annular groove; 36-a throttle orifice; 37-sealing ring; 38-a safety regulating plate; 39-adjusting screw III; 40-an exhaust membrane; 41-a pressure sensor; 42-dryer.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific examples, which are not intended to limit the invention, so that those skilled in the art may better understand the invention and practice it.
FIG. 1 is a schematic view of an air handling unit assembly for a vehicle according to an embodiment of the present invention. The vehicle air treatment unit assembly of the embodiment comprises a dryer 42 and four-loop protection valves, wherein the air outlet of the dryer 42 is communicated with the air inlet 2 of the four-loop protection valves.
Specifically, the four-circuit protection valve of the embodiment comprises a valve body 1, wherein an air inlet 2 and an air inlet channel are arranged on the valve body 1, 21, 22, 23 and 24 ports are further arranged on the valve body 1, a first air outlet channel 3, a second air outlet channel 4, a third air outlet channel 5 and a fourth air outlet channel 6 are respectively and correspondingly arranged in the valve body 1, and piston valve mechanisms are respectively arranged between the first air outlet channel 3, the second air outlet channel 4, the third air outlet channel 5 and the fourth air outlet channel 6 and the air inlet channel. A pressure limiting valve mechanism which is closed after the pressures of the 23 ports and the 24 ports reach a set threshold value is arranged between the air inlet channel and the third air outlet channel 5 and the fourth air outlet channel 6; a safety valve mechanism is arranged between the third air outlet channel 5 and the first air outlet channel 3. Pressure sensors 41 are provided on the 21 st and 22 nd ports of the present embodiment.
Further, the piston valve mechanism of the embodiment comprises a valve seat 7 fixedly mounted on the valve body 1, a valve cavity 8 is arranged in the valve seat 7, an inner cavity 9 and an outer cavity 10 are arranged on the valve body 1 corresponding to the valve cavity 8, the outer cavity 10 is an annular cavity and is arranged around the inner cavity 9, a diaphragm 11 is arranged between the valve seat 7 and the valve body 1, and a pressing plate mechanism for enabling the diaphragm 11 to be attached to the valve body 1 and isolating the inner cavity 9 and the outer cavity 10 is arranged in the valve seat 7. The pressing plate mechanism of the embodiment comprises a pressing plate 12 which is installed in the valve cavity 8 in a sliding fit manner, and a pressing plate spring 13 which is used for pressing the pressing plate 12 on the diaphragm 11 and isolating the inner cavity 9 and the outer cavity 10 is arranged between the pressing plate 12 and the valve cavity 8. The end of the pressing plate spring 13 facing away from the pressing plate 12 in this embodiment is provided with an adjusting pressing plate 14, and the valve seat 7 is provided with an adjusting screw I15 for adjusting the distance between the adjusting pressing plate 14 and the pressing plate 12 and further adjusting the pre-elasticity of the pressing plate spring 13. Specifically, the inner cavity 9 is communicated with the corresponding first air outlet channel 3, second air outlet channel 4, third air outlet channel 5 or fourth air outlet channel 6, and the outer cavity 10 is communicated with the air inlet channel; or the outer cavity 10 is communicated with the corresponding first air outlet channel 3, second air outlet channel 4, third air outlet channel 5 or fourth air outlet channel 6, and the inner cavity 9 is communicated with the air inlet channel. The inner cavity 9 of the present embodiment is communicated with the corresponding first air outlet channel 3, second air outlet channel 4, third air outlet channel 5 or fourth air outlet channel 6, and the outer cavity 10 is communicated with the air inlet channel.
Further, the axes of the 21, 22, 23 and 24 ports of the present embodiment are parallel to each other and perpendicular to the axis of the intake port 2, and the 21, 22, 23 and 24 ports are all provided on the same side wall of the valve body 1; all axes of the valve cavity 8 are parallel to the axis of the air inlet and perpendicular to the axis of the 21 ports, and all valve seats 7 are arranged on the same side wall of the valve body 1, so that the installation space of a product can be effectively reduced, and the structure is more compact.
Further, the pressure limiting valve mechanism of the present embodiment includes a pressure limiting valve chamber 16 provided in the valve body 1 and a pressure limiting valve cover 17 covering the pressure limiting valve chamber 16; the pressure limiting valve cavity 16 is internally provided with a pressure limiting valve 18 and a pressure limiting piston 19 fixedly connected with the pressure limiting valve 18, and the pressure limiting piston 19 is positioned between the pressure limiting valve 18 and the pressure limiting valve cover 17. The pressure limiting valve cavity of the embodiment is internally provided with a pressure limiting air inlet cavity 20 and a pressure limiting air outlet cavity 25 which are respectively positioned at two sides of the pressure limiting valve 18, the pressure limiting air inlet cavity 20 is positioned at one side of the pressure limiting valve 18, which is opposite to the pressure limiting piston 19, and the pressure limiting air outlet cavity 25 is positioned between the pressure limiting valve 18 and the pressure limiting piston 19. A pressure limiting mechanism for keeping the pressure limiting valve 18 in an open state and closing after the pressures of the 23 ports and 24 ports reach a set threshold value is provided between the pressure limiting piston 19 and the pressure limiting valve cover 17 in the present embodiment. Specifically, the pressure-limiting air inlet cavity 20 is communicated with an air inlet channel, and the air inlet end of the piston valve mechanism corresponding to the 23 ports and the 24 ports is communicated with the pressure-limiting air outlet cavity 25; or the air outlet end of the piston valve mechanism which is arranged corresponding to the 23 ports and the 24 ports is communicated with the pressure-limiting air inlet cavity 20, and the third air outlet channel 5 and the fourth air outlet channel 6 are respectively communicated with the pressure-limiting air outlet cavity 25. The pressure-limiting air inlet chamber 20 of the present embodiment is communicated with an air inlet channel, and the air inlet end of the piston valve mechanism corresponding to the 23 ports and the 24 ports is communicated with the pressure-limiting air outlet chamber 25, that is, the outer chamber 10 of the piston valve mechanism corresponding to the 23 ports and the 24 ports is communicated with the pressure-limiting air outlet chamber 25. The pressure-limiting air outlet chamber 25 of the present embodiment communicates with the corresponding outer chamber 10 through the a chamber and the B chamber provided in the valve body, and the bottom of the outer chamber 10 is provided with a apron 10a.
Further, the pressure limiting mechanism of the present embodiment includes a pressure limiting spring 26 provided between the pressure limiting piston 19 and the pressure limiting valve cover 17. The pressure limiting spring 26 is provided with a pressure limiting adjusting plate 27 at one end facing the pressure limiting valve cover 17, and an adjusting screw II 28 is arranged on the pressure limiting valve cover 17 for adjusting the distance between the pressure limiting adjusting plate 27 and the pressure limiting piston 19, thereby adjusting the pre-elasticity of the pressure limiting spring 26. The axis of the pressure limiting valve chamber 16 of this embodiment is perpendicular to the axis of the intake port 2, and the axis of the pressure limiting valve chamber 16 is perpendicular to the axis of the 21 port.
Further, the safety valve mechanism of the present embodiment includes a safety valve chamber 29 provided in the valve body 1, the safety valve chamber 29 including a large-diameter section 29a, a middle-diameter section 29b, and a small-diameter section 29c, the middle-diameter section 29b being located between the large-diameter section 29a and the small-diameter section 29c, the large-diameter section 29a being located outside the middle-diameter section 29 b; the large diameter section 29a has an inner diameter greater than the inner diameter of the intermediate diameter section 29b, and the intermediate diameter section 29b has an inner diameter greater than the inner diameter of the small diameter section 29 c. The large diameter section 29a is fixedly provided with a guide sleeve 30, the inner side end surface of the guide sleeve 30 facing the bottom of the safety valve cavity 29 is provided with a guide hole with the inner diameter equal to that of the middle diameter section 29b, the middle diameter section 29b is internally provided with a safety piston 31 in sliding fit with the guide hole, and the outer end of the safety piston 31 extends into the guide hole and is in sliding fit with the guide hole. A blind hole is arranged on the end face of the safety piston 31 facing the guide sleeve 30, and a safety spring 32 which enables the safety piston 31 to be in contact fit with the inner end face of the intermediate diameter section 29b in a free state is arranged between the bottom of the blind hole and the bottom of the guide hole. An annular cavity is formed between the outer peripheral wall of the guide sleeve 30 and the inner wall of the large-diameter section 29a, a communication hole 33 communicated with the annular cavity is formed in the side wall of the guide hole, an exhaust port 34 communicated with the annular cavity is formed in the valve body 1, and an exhaust diaphragm 40 is arranged on the exhaust port 34. An annular groove 35 is formed in the inner wall of the intermediate diameter section 29b, a throttling small hole 36 is formed in the side wall of the blind hole, when the safety piston 31 is in contact fit with the inner side end face of the intermediate diameter section 29b, the throttling small hole 36 is communicated with the annular groove 35, the annular groove 35 is communicated with the third air outlet channel 5 through a cavity C and a cavity D, and the small diameter section 29C is communicated with the first air outlet channel 3 through a cavity E and a cavity F.
Further, a seal ring 37 positioned inside the annular groove 35 is arranged between the safety piston 31 and the inner wall of the intermediate diameter section 29 b; the guide hole is internally provided with a radially inward extending annular bulge, the inner diameter of the annular bulge is smaller than the outer diameter of the safety piston 31, and when the safety piston 31 is in contact fit with the inner end surface of the intermediate diameter section 29b, the axial distance between the safety piston 31 and the annular bulge is larger than the axial distance between the throttle orifice 36 and the sealing ring 37, namely, when the safety piston 31 is in contact fit with the annular bulge, the throttle orifice 36 is positioned on the outer side of the sealing ring 37, and the throttle orifice 36 is not communicated with the annular groove 35.
Further, the outer end of the safety spring 32 facing the guide sleeve 30 in this embodiment is provided with a safety adjusting plate 38, and the guide sleeve 30 is provided with an adjusting screw iii 39 for adjusting the distance between the safety adjusting plate 38 and the safety piston 31, so as to adjust the pre-elastic force of the safety spring 32. The axis of the relief valve chamber 29 of this embodiment is parallel to the axis of the 21 ports, and the axis of the relief valve chamber 29 is perpendicular to both the axis of the intake port 2 and the valve chamber 8.
The four-loop protection valve of the embodiment can close the pressure limiting valve mechanism after the pressures of the 23 ports and the 24 ports reach the set threshold value by arranging the pressure limiting valve mechanism between the air inlet channel and the third air outlet channel and the fourth air outlet channel, so that the pressure limiting of the 23 ports and the 24 ports is realized, and the pressures in the 23 ports and the 24 ports are the pressure limiting values of the 23 ports and the 24 ports; through setting up the relief valve mechanism between third air outlet channel and said first air outlet channel, after 21 mouths are cut off, can ensure 23 mouths of air pressures drop too, 23 mouths connect the auxiliary manual valve of parking, make relieve the air pressure drop like this, the spring brake air chamber realizes the automatic parking under the function of energy storage spring, play a role in driving protection; in conclusion, the four-loop protection valve can realize 23-port and 24-port pressure limiting and backflow protection functions without externally connecting a pressure limiting valve and a one-way valve.
Specifically, the principle of the vehicle air treatment unit assembly of this embodiment is as follows:
the air passing through the treatment port of the dryer enters from the air inlet, part of the air reaches the outer cavity/inner cavity, acts on the diaphragm and the pressing plate, and after the acting force is larger than the acting force of the pressing plate spring, the piston valve mechanism is opened, the air pressure reaches the inner cavity/outer cavity, and the air is discharged from the 21 ports and the 22 ports; by arranging the pressure sensors at the 21-mouth and the 22-mouth, the pressure sensor can be used for monitoring the air pressure of the 21-mouth and the 22-mouth in real time, so that the pressure value can be conveniently judged by the whole vehicle;
when the air flow 21 is exhausted, a part of air pressure enters a small-diameter section of the safety valve cavity and acts on the safety piston, after the air pressure value reaches a certain value, the safety piston is driven to move towards the guide sleeve after overcoming the acting force of the safety spring, and the throttle small hole on the safety piston is not communicated with the annular groove in a dislocation way;
the other part of the air inlet enters a pressure-limiting air inlet cavity, enters a pressure-limiting air outlet cavity through a normally-open pressure-limiting valve, and is discharged through 23 ports and 24 ports or through piston valve mechanisms corresponding to the 23 ports and 24 ports, so that 23 ports and 24 ports are discharged;
when the air pressure of the 23 mouth and the 24 mouth reaches a certain value, the air pressure acting on the pressure limiting piston is larger than the acting force of the pressure limiting spring, the pressure limiting valve is closed under the action of the pressure limiting piston, and at the moment, the air inlet does not ventilate the 23 mouth and the 24 mouth, and the obtained air pressure value is the pressure limiting value of the 23 mouth and the 24 mouth;
when the 21 mouth is out of air, namely the pressure of the 21 mouth is reduced to zero, the air pressure of the small diameter section of the safety valve cavity is reduced, the safety piston moves towards the inner side of the small diameter section under the action of the elastic force of the safety spring, and when the safety piston is in contact fit with the inner side of the middle diameter section, the throttling small hole is communicated with the annular groove; at this moment, 23 air pressures enter the safety valve cavity through the annular groove and the throttling small hole and flow into the atmosphere from the exhaust port, namely, after 21 air vents, the 23 air pressures are simultaneously reduced, and 23 air pressures are connected with the parking auxiliary manual control valve, so that the release air pressure is reduced, the spring brake air chamber realizes automatic parking under the action of the energy storage spring, and the driving protection function is realized.
The above-described embodiments are merely preferred embodiments for fully explaining the present invention, and the scope of the present invention is not limited thereto. Equivalent substitutions and modifications will occur to those skilled in the art based on the present invention, and are intended to be within the scope of the present invention. The protection scope of the invention is subject to the claims.
Claims (17)
1. The four-loop protection valve comprises a valve body (1), wherein an air inlet (2) and an air inlet channel are arranged on the valve body (1), 21, 22, 23 and 24 ports are also arranged on the valve body (1), a first air outlet channel (3), a second air outlet channel (4), a third air outlet channel (5) and a fourth air outlet channel (6) are respectively and correspondingly arranged in the valve body (1) and correspond to the 21, 22, 23 and 24 ports, and piston valve mechanisms are respectively arranged between the first air outlet channel (3), the second air outlet channel (4), the third air outlet channel (5) and the fourth air outlet channel (6) and the air inlet channel; the method is characterized in that:
a pressure limiting valve mechanism which is closed after the pressures of the 23 ports and the 24 ports reach a set threshold value is arranged between the air inlet channel and the third air outlet channel (5) and between the air inlet channel and the fourth air outlet channel (6); a safety valve mechanism is arranged between the third air outlet channel (5) and the first air outlet channel (3);
the safety valve mechanism comprises a safety valve cavity (29) arranged in the valve body (1), the safety valve cavity (29) comprises a large-diameter section (29 a), a middle-diameter section (29 b) and a small-diameter section (29 c), the middle-diameter section (29 b) is positioned between the large-diameter section (29 a) and the small-diameter section (29 c), and the large-diameter section (29 a) is positioned outside the middle-diameter section (29 b); the inner diameter of the large-diameter section (29 a) is larger than the inner diameter of the middle-diameter section (29 b), and the inner diameter of the middle-diameter section (29 b) is larger than the inner diameter of the small-diameter section (29 c);
pressure sensors (41) are arranged on the 21 ports and the 22 ports;
the piston valve mechanism comprises a valve seat (7) fixedly mounted on the valve body (1), a valve cavity (8) is arranged in the valve seat (7), and an inner cavity (9) and an outer cavity (10) are arranged on the valve body (1) corresponding to the valve cavity (8).
2. The four-circuit protection valve according to claim 1, wherein: the outer cavity (10) is an annular cavity and surrounds the inner cavity (9), a diaphragm (11) is arranged between the valve seat (7) and the valve body (1), and a pressing plate mechanism used for enabling the diaphragm (11) to be attached to the valve body (1) and separating the inner cavity (9) from the outer cavity (10) is arranged in the valve seat (7).
3. The four-circuit protection valve according to claim 2, wherein: the pressing plate mechanism comprises a pressing plate (12) which is installed in the valve cavity (8) in a sliding fit mode, and a pressing plate spring (13) which is used for enabling the pressing plate (12) to press the diaphragm (11) and isolating the inner cavity (9) and the outer cavity (10) is arranged between the pressing plate (12) and the valve cavity (8).
4. A four-circuit protection valve according to claim 3, characterized in that: one end of the pressing plate spring (13) back to the pressing plate (12) is provided with an adjusting pressing plate (14), and the valve seat (7) is provided with an adjusting screw I (15) for adjusting the distance between the adjusting pressing plate (14) and the pressing plate (12) and further adjusting the pre-elasticity of the pressing plate spring (13).
5. The four-circuit protection valve according to claim 1, wherein: the axes of the 21 mouth, the 22 mouth, the 23 mouth and the 24 mouth are mutually parallel and are perpendicular to the axis of the air inlet (2), and the 21 mouth, the 22 mouth, the 23 mouth and the 24 mouth are all arranged on the same side wall of the valve body (1); all the axes of the valve cavities (8) are parallel to the axis of the air inlet and perpendicular to the axis of the 21-mouth, and all the valve seats (7) are arranged on the same side wall of the valve body (1).
6. The four-circuit protection valve according to any one of claims 1-5, wherein: the inner cavity (9) is communicated with the corresponding first air outlet channel (3), second air outlet channel (4), third air outlet channel (5) or fourth air outlet channel (6), and the outer cavity (10) is communicated with the air inlet channel; or the outer cavity (10) is communicated with the corresponding first air outlet channel (3), second air outlet channel (4), third air outlet channel (5) or fourth air outlet channel (6), and the inner cavity (9) is communicated with the air inlet channel.
7. The four-circuit protection valve according to any one of claims 1-5, wherein: the pressure limiting valve mechanism comprises a pressure limiting valve cavity (16) arranged in the valve body (1) and a pressure limiting valve cover (17) covered on the pressure limiting valve cavity (16); a pressure limiting valve (18) and a pressure limiting piston (19) fixedly connected with the pressure limiting valve (18) are arranged in the pressure limiting valve cavity (16), and the pressure limiting piston (19) is positioned between the pressure limiting valve (18) and the pressure limiting valve cover (17);
the pressure limiting valve cavity is internally provided with a pressure limiting air inlet cavity (20) and a pressure limiting air outlet cavity (25) which are respectively positioned at two sides of the pressure limiting valve (18), the pressure limiting air inlet cavity (20) is positioned at one side of the pressure limiting valve (18) opposite to the pressure limiting piston (19), and the pressure limiting air outlet cavity (25) is positioned between the pressure limiting valve (18) and the pressure limiting piston (19);
a pressure limiting mechanism for keeping the pressure limiting valve (18) in an open state and closing after the pressures of the 23 ports and the 24 ports reach a set threshold value is arranged between the pressure limiting piston (19) and the pressure limiting valve cover (17).
8. The four-circuit protection valve according to claim 7, wherein: the pressure limiting mechanism comprises a pressure limiting spring (26) arranged between the pressure limiting piston (19) and the pressure limiting valve cover (17).
9. The four-circuit protection valve according to claim 8, wherein: one end of the pressure limiting spring (26) facing the pressure limiting valve cover (17) is provided with a pressure limiting adjusting plate (27), and an adjusting screw II (28) used for adjusting the distance between the pressure limiting adjusting plate (27) and the pressure limiting piston (19) and further adjusting the pre-elasticity of the pressure limiting spring (26) is arranged on the pressure limiting valve cover (17).
10. The four-circuit protection valve according to claim 7, wherein: the pressure-limiting air inlet cavity (20) is communicated with the air inlet channel, and the air inlet end of the piston valve mechanism corresponding to the 23 ports and the 24 ports is communicated with the pressure-limiting air outlet cavity (25); or the air outlet end of the piston valve mechanism which is arranged corresponding to the 23 ports and the 24 ports is communicated with the pressure-limiting air inlet cavity (20), and the third air outlet channel (5) and the fourth air outlet channel (6) are respectively communicated with the pressure-limiting air outlet cavity (25).
11. The four-circuit protection valve according to claim 7, wherein: the axis of the pressure limiting valve cavity (16) is perpendicular to the axis of the air inlet (2), and the axis of the pressure limiting valve cavity (16) is perpendicular to the axis of the 21-port.
12. The four-circuit protection valve according to any one of claims 1-5, wherein:
a guide sleeve (30) is fixedly arranged in the large-diameter section (29 a), a guide hole with the inner diameter equal to that of the middle-diameter section (29 b) is formed in the inner end surface of the guide sleeve (30) facing the cavity bottom of the safety valve cavity (29), a safety piston (31) in sliding fit with the middle-diameter section (29 b) is arranged in the middle-diameter section, and the outer end of the safety piston (31) extends into the guide hole and is in sliding fit with the guide hole;
a blind hole is formed in the end face of one end of the safety piston (31) facing the guide sleeve (30), and a safety spring (32) which enables the safety piston (31) to be in contact fit with the inner end face of the middle diameter section (29 b) in a free state is arranged between the bottom of the blind hole and the bottom of the guide hole;
an annular cavity is formed between the outer peripheral wall of the guide sleeve (30) and the inner wall of the large-diameter section (29 a), a communication hole (33) communicated with the annular cavity is formed in the side wall of the guide hole, and an exhaust port (34) communicated with the annular cavity is formed in the valve body (1);
an annular groove (35) is formed in the inner wall of the middle diameter section (29 b), a throttling small hole (36) is formed in the side wall of the blind hole, and when the safety piston (31) is in contact fit with the inner side end face of the middle diameter section (29 b), the throttling small hole (36) is communicated with the annular groove (35), the annular groove (35) is communicated with the third air outlet channel (5), and the small diameter section (29 c) is communicated with the first air outlet channel (3).
13. The four-circuit protection valve according to claim 12, wherein: a sealing ring (37) positioned at the inner side of the annular groove (35) is arranged between the safety piston (31) and the inner wall of the intermediate diameter section (29 b); the guide hole is internally provided with a radial inward extending annular bulge, the inner diameter of the annular bulge is smaller than the outer diameter of the safety piston (31), and when the safety piston (31) is in contact fit with the inner side end surface of the middle diameter section (29 b), the axial distance between the safety piston (31) and the annular bulge is larger than the axial distance between the throttling hole (36) and the sealing ring (37).
14. The four-circuit protection valve according to claim 12, wherein: the safety spring (32) is provided with a safety adjusting plate (38) facing the outer end of the guide sleeve (30), and the guide sleeve (30) is provided with an adjusting screw III (39) for adjusting the distance between the safety adjusting plate (38) and the safety piston (31).
15. The four-circuit protection valve according to claim 12, wherein: an exhaust diaphragm (40) is arranged on the exhaust port (34).
16. The four-circuit protection valve according to claim 12, wherein: the axis of the safety valve cavity (29) is parallel to the axis of the 21 port, and the axis of the safety valve cavity (29) is perpendicular to the axes of the air inlet (2) and the valve cavity (8) at the same time.
17. An air handling unit assembly for a vehicle, characterized in that: comprising a dryer (42) and a four-circuit protection valve according to any one of claims 1-16, the air outlet of the dryer (42) being in communication with the air inlet (2).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810601329.1A CN108437964B (en) | 2018-06-12 | 2018-06-12 | Air treatment unit assembly for vehicle and four-loop protection valve thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810601329.1A CN108437964B (en) | 2018-06-12 | 2018-06-12 | Air treatment unit assembly for vehicle and four-loop protection valve thereof |
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| CN108437964A CN108437964A (en) | 2018-08-24 |
| CN108437964B true CN108437964B (en) | 2024-01-16 |
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| 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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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110149740B (en) * | 2019-06-17 | 2024-02-20 | 郭康宁 | Anti-fogging device for car window glass and anti-fogging and defrosting method |
| CN111907506B (en) * | 2020-08-18 | 2022-09-16 | 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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