CN111762142B - Relay valve capable of outputting two pressures - Google Patents
Relay valve capable of outputting two pressures Download PDFInfo
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- CN111762142B CN111762142B CN202010655190.6A CN202010655190A CN111762142B CN 111762142 B CN111762142 B CN 111762142B CN 202010655190 A CN202010655190 A CN 202010655190A CN 111762142 B CN111762142 B CN 111762142B
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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
- B60T15/00—Construction arrangement, or operation of valves incorporated in power brake systems and not covered by groups B60T11/00 or B60T13/00
- B60T15/02—Application and release valves
- B60T15/18—Triple or other relay valves which allow step-wise application or release and which are actuated by brake-pipe pressure variation to connect brake cylinders or equivalent to compressed air or vacuum source or atmosphere
- B60T15/184—Railway control or brake valves
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Abstract
The invention discloses a relay valve capable of outputting two pressures, and relates to the technical field of railway vehicle brake systems; the air source valve comprises a valve body, a valve rod assembly, a reset assembly and a piston assembly, wherein an input cavity, an output cavity and a pre-control cavity are arranged in the valve body, a wind source input passage communicated with the input cavity, a wind source output passage communicated with the output cavity and a pre-control passage communicated with the pre-control cavity are communicated with the output cavity; by implementing the technical scheme, the relay valve can output large-flow compressed air with the same pre-control pressure; and the aim of reducing the output pressure can be achieved by converting and outputting large-flow compressed air with pressure lower than the pre-control pressure.
Description
Technical Field
The invention relates to the technical field of railway vehicle brake systems, in particular to a relay valve capable of outputting two pressures.
Background
In order to accurately control the pressure of compressed air and improve the air charging and discharging rate of a railway vehicle brake system, a relay valve is generally adopted to amplify the air flow and control the pressure value of the compressed air, the relay valve is mainly used for an output loop of the railway vehicle brake system and can output large-flow compressed air with the same pre-control pressure, in order to control the brake pressure, a single-channel or multi-channel pressure adjusting module is respectively attached to a brake cylinder of a front axle and a brake cylinder of a rear axle of the vehicle, and each pressure adjusting module is provided with a relay valve device.
The relay valve in the traditional railway locomotive brake system can only output one pressure, however, some vehicles, such as locomotives, need to output lower pressure when the locomotive is in unpowered return, and the existing common relay valve cannot realize the function.
Disclosure of Invention
In order to solve the above-described problems, an object of the present invention is to provide a relay valve capable of outputting two types of pressure, which is used in an output circuit of a railway vehicle brake system so as to output a large flow rate of compressed air equal to a pilot pressure; and the aim of reducing the output pressure can be achieved by converting and outputting large-flow compressed air with the pressure lower than the pre-control pressure, and the method has a good application prospect.
The technical scheme adopted by the invention is as follows:
a kind of relay valve that can output two kinds of pressure, is used in the output circuit of the braking system of the railway vehicle, including valve block, valve stem assembly, reset assembly and piston assembly;
the valve body is internally provided with an input cavity, an output cavity, a pre-control cavity, a wind source input passage communicated with the input cavity, a wind source output passage communicated with the output cavity and a pre-control passage communicated with the pre-control cavity;
the valve rod assembly comprises a valve rod and a sealing element sleeved outside the valve rod, the valve rod extends from the input cavity to the pre-control cavity through the output cavity and is slidably arranged in the valve body along the extending direction of the valve rod, the valve rod is provided with an inner through hole penetrating through the valve rod along the length direction of the valve rod, so that a first valve port is formed between the input cavity and the output cavity, and a second valve port is formed between the output cavity and the pre-control cavity;
the resetting component is positioned between the valve body and the valve rod component and is used for driving the valve rod component to close the first valve port;
the piston assembly comprises a piston rod and a piston seat fixedly sleeved on the piston rod, the piston rod is slidably inserted into the second valve port and is abutted against the valve rod, the piston rod is provided with a connecting through hole penetrating along the length direction of the piston rod, and the connecting through hole is communicated with the external atmosphere; the piston assembly is positioned in the pre-control cavity, and an annular cavity A is formed on one side, close to the output cavity, of the piston seat, so that the wind source output passage is communicated with the annular cavity A; a piston step which is arranged in a concave manner is arranged on one side, away from the output cavity, of the piston seat, and an annular chamber B is formed between the bottom surface of the step of the piston step and the valve body, so that the pre-control passage is communicated with the annular chamber B; an inner ring chamber C is formed between the inner side of the piston step and the piston rod, a switching channel communicated with the inner ring chamber C is arranged in the lateral direction of the inner ring chamber C, a switching plunger is slidably arranged in the switching channel, and the relay valve has a first pressure state that the inner ring chamber C is communicated with the annular chamber B and is disconnected from the atmosphere through the switching plunger in the switching channel; the relay valve has a second pressure state in which the inner ring chamber C is communicated with the atmosphere and the inner ring chamber C is disconnected from the annular chamber B by a switching plunger in the switching passage.
Preferably, as for the above technical scheme, the selected reset component is a spring, two ends of the spring are respectively abutted to the top of the valve body and the top of the valve rod, the reset component is not limited to the spring, and the reset component can ensure that the driving valve rod makes a return motion relative to the valve body under the action of the pre-control pressure, that is, the force acting on the valve rod through the reset component has a tendency of enabling the sealing element on the valve rod to close the first valve port.
Optionally, the switching plunger extends into one end of the switching channel, the inner side of the switching channel is provided with a connecting channel communicated with the switching channel, the lateral side of the connecting channel is provided with a connecting hole communicated with the connecting channel, the lateral side of the switching channel is provided with a first control hole used for communicating with the inner ring chamber C, a second control hole used for communicating with the annular chamber B and a third control hole used for communicating with the external atmosphere, so that in the first pressure state, the third control hole is blocked by the switching plunger and is communicated with the switching channel, and the second control hole is communicated with the first control hole through the switching channel, so that the inner ring chamber C is communicated with the annular chamber B; so that under the second pressure position state, through switching plunger shutoff control hole two and make connecting hole and control hole three correspond and be linked together, control hole three communicates with control hole one through connecting channel and switching channel this moment to guarantee that ring cavity C communicates with outside atmosphere, and then reduce output pressure, this structural design is simple but ingenious reasonable.
Optionally, the conversion plunger can slide in a direction close to or far away from the control hole, and the sliding direction of the conversion plunger is perpendicular to the length direction of the piston rod.
Optionally, at least two rubber rings are sleeved outside the conversion plunger to form a sealing connection between the conversion plunger and the switching channel. Preferably, four rubber rings are sleeved on the conversion plunger, the rubber rings are used for plugging the control hole III and the connecting hole in the first pressure state, and the rubber rings are used for plugging the control hole II in the second pressure state, so that the accuracy of switching the output pressure is ensured.
Optionally, the connecting hole is located between at least two of the rubber rings.
Optionally, the seal comprises a first annular seal located within the input chamber and cooperating with the sliding movement of the valve stem to close a valve port; preferably, the first annular seal is an O-ring seal.
Optionally, the seal further comprises a second annular seal located in the output chamber and cooperating with the sliding movement of the valve stem to close the second valve port; preferably, the second annular seal is an O-ring seal.
Optionally, the valve body is provided with an exhaust hole, the exhaust hole is close to the pre-control cavity and used for communicating the pre-control cavity with the external atmosphere, and the piston rod is slidably inserted into the exhaust hole and seals the exhaust hole.
Optionally, a first annular groove is formed around the outer surface of the piston seat, and the depth direction of the first annular groove extends along one side close to the middle piston rod; a second annular groove corresponding to the first annular groove is formed in the side wall of the valve body surrounding the pre-control cavity, and the depth direction of the second annular groove extends along one side far away from the middle piston rod; the piston assembly further comprises an elastic connecting piece, one end of the elastic connecting piece is embedded in the first annular groove, the other end of the elastic connecting piece is embedded in the second annular groove, and the elastic connecting piece enables two independent sealed chambers to be formed between the annular chamber A and the annular chamber B. By adopting the structure, the elastic connecting piece has the effects that on one hand, the annular chamber A and the annular chamber B can be kept to be good in sealing performance of the rubber ring grooves arranged on the piston steps, and on the other hand, the relay valve has the tendency of returning to the normal pressure state when the relay valve is in the pressure ascending position or the pressure descending position according to the change of the pre-control pressure.
Optionally, the rubber ring groove surrounds the outer surface of the piston step; and a sealing ring is embedded in the rubber ring groove, and the sealing ring enables the annular cavity B and the inner ring cavity C to form two independent sealed cavities. By adopting the structure, the lower side of the piston seat is divided into two areas, wherein the area of the top plane area of the piston step close to the inner ring chamber C is S2, the area of the bottom plane area of the piston step close to the annular chamber B is S1-S2, and thus when the pre-control pressure is maintained, the distribution area of the pre-control pressure can be switched by the conversion plunger piston, and the purpose of reducing the output pressure is further achieved.
As described above, the present invention has at least the following advantages over the prior art:
1. the relay valve can control the opening or closing of the valve port of the action valve according to the change of the pre-control pressure, so as to realize the functions of rising, falling and pressure maintaining of the output pressure; meanwhile, the relay valve is structurally improved aiming at the problem that the existing relay valve cannot output lower pressure, and by additionally arranging the switching channel and the switching plunger, high-flow compressed air with pressure lower than the pre-control pressure can be output through switching, so that the structural design is more ingenious and reasonable.
2. The relay valve is provided with at least two rubber rings which are sleeved on the outer side of the conversion plunger, and the sealing performance of each control hole and each connecting hole can be ensured through the rubber rings when the relay valve is switched to a first pressure state or a second pressure state through the conversion plunger, so that the accuracy of switching output pressure is further ensured.
In conclusion, the relay valve is applied to an output loop of a railway vehicle braking system, can accurately and quickly control the braking pressure, can output large-flow compressed air with pressure lower than the pre-control pressure, meets the operation requirement of the locomotive braking system during unpowered return, has good application prospect and popularization and use value in the technical field of railway vehicle braking systems, and is suitable for popularization and application.
Drawings
The invention will be described by way of specific embodiments and with reference to the accompanying drawings, in which
FIG. 1 is a schematic structural diagram of a relay valve capable of outputting two pressures according to an embodiment of the present invention in a normal pressure state;
FIG. 2 is a schematic structural diagram of the valve body in FIG. 1 according to the embodiment of the present invention;
FIG. 3 is a schematic view of the piston assembly of FIG. 1 in accordance with an embodiment of the present invention;
FIG. 4 is a schematic view of the transition plunger of FIG. 1 in accordance with an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a relay valve capable of outputting two pressures according to an embodiment of the present invention in a low pressure state.
Description of reference numerals: 10-a valve body; 11-an input cavity; 12-an output cavity; 13-a pre-control cavity; 110-wind source input path; 120-wind source output path; 130-a pre-control path; 14-valve port one; 15-valve port two; 16-air vent; 20-a valve stem assembly; 21-a valve stem; 211-internal through holes; 221-a first annular seal; 222-a second annular seal; 30-a piston assembly; 31-a piston rod; 311-connecting vias; 32-a piston seat; 33-piston step; 331-step bottom surface; 34-annular chamber a; 35-annular chamber B; 36-inner ring chamber C; 40-switching channels; k1-control hole one; k2-control hole two; k3-control hole III; 50-a transition plunger; 510-connecting a channel; 511-connecting hole; 51-rubber ring; 60-a reduction assembly; 70-an elastic connector; 71-a first annular groove; 72-a second annular groove; 80-sealing ring; 81-rubber ring groove.
Detailed Description
All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
Any feature disclosed in this specification may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
The embodiments are substantially as shown in figures 1 to 5: the embodiment provides a relay valve capable of outputting two pressures, which is applied to an output circuit of a railway vehicle braking system, and comprises a valve body 10, a valve rod assembly 20, a resetting assembly 60 and a piston assembly 30; as shown in fig. 2, the valve body 10 has three chambers, each of which is provided with a passage communicated with the outside, in this embodiment, the three chambers are an input chamber 11, an output chamber 12 and a pre-control chamber 13, respectively, and the valve body 10 further includes an air source input passage 110 communicated with the input chamber 11, an air source output passage 120 communicated with the output chamber 12 and a pre-control passage 130 communicated with the pre-control chamber 13.
The valve stem assembly 20 provided in this embodiment includes a valve stem 21 and a sealing member sleeved outside the valve stem 21, wherein the valve stem 21 extends from the input chamber 11 to the pilot chamber 13 through the output chamber 12 and is slidably disposed in the valve body 10 along an extending direction thereof, so that a first valve port 14 is formed between the input chamber 11 and the output chamber 12, and a second valve port 15 is formed between the output chamber 12 and the pilot chamber 13.
The reset assembly 60 provided in this embodiment is located between the valve body 10 and the valve stem assembly 20 and is used to drive the valve stem assembly 20 to close the first valve port 14, and it should be noted that the closing refers to the disconnection between the two chambers; as a preferable solution of this embodiment, the selected restoring component 60 is a spring, two ends of the spring are respectively abutted against the top of the valve body 10 and the top of the valve stem 21, the restoring component 60 is not limited to a spring, and the restoring component 60 can ensure that the driving valve stem 21 performs a restoring motion relative to the valve body 10 under the action of the pilot pressure, that is, the force acting on the valve stem 21 through the restoring component has a tendency of causing the sealing member on the valve stem 21 to close the first valve port 14.
Specifically, the valve rod 21 provided in this embodiment is provided with an inner through hole 211 penetrating through the valve rod 21 along the length direction of the valve rod 21, so that the lower connecting end of the valve rod 21 can communicate with the inner through hole 211 of the valve rod 21; preferably, the sealing element sleeved on the valve rod 21 includes a first annular sealing element 221, the first annular sealing element 221 is embedded in an annular groove formed in the outer surface of the valve rod 21 in a surrounding manner, and the first annular sealing element 221 is located in the input cavity 11 and is matched with the sliding of the valve rod 21 to close the first valve port 14; further, the sealing element also comprises a second annular sealing element 222, the second annular sealing element 222 is embedded in an annular groove formed in the outer surface of the valve rod 21 in a surrounding manner, and the second annular sealing element 222 is positioned in the output cavity 12 and is matched with the sliding of the valve rod 21 so as to close the second valve port 15; in a further preferred embodiment of the present invention, the first annular seal 221 and the second annular seal 222 are O-rings 80, and the engagement between the O-rings 80 and the piston rod 31 can be made more compact by applying pressure to the O-rings 80 by external air pressure, thereby providing a better sealing effect.
Referring to fig. 1 and fig. 3, the piston assembly 30 provided in this embodiment includes a piston rod 31 and a piston seat 32 fixedly sleeved on the piston rod 31, the piston rod 31 is slidably inserted into the second valve port 15 and abuts against a connecting end of the bottom of the valve rod 21, the piston rod 31 is provided with a connecting through hole 311 penetrating along a length direction of the piston rod 31, and the connecting through hole 311 is communicated with the external atmosphere; the piston assembly 30 is positioned in the pilot chamber 13, and an annular chamber A34 is formed on one side of the piston seat 32 close to the output chamber 12, so that the wind source output passage 120 is communicated with the annular chamber A34; the piston seat 32 is provided with a piston step 33 which is arranged in a concave manner on the side away from the output cavity 12, and an annular chamber B35 is formed between the step bottom surface 331 of the piston step 33 and the valve body 10 so that the pre-control passage 130 is communicated with an annular chamber B35; an inner ring chamber C36 is formed between the inner side of the piston step 33 and the piston rod 31, a switching passage 40 communicated with the inner ring chamber C36 is arranged at the side of the inner ring chamber C36, a switching plunger 50 is slidably arranged in the switching passage 40, and the relay valve has a first pressure state (a normal pressure state shown in fig. 1) that the inner ring chamber C36 is communicated with the ring chamber B35 and the inner ring chamber C36 is disconnected from the atmosphere through the switching plunger 50 in the switching passage 40; meanwhile, the relay valve has a second pressure state (a low pressure state shown in fig. 5) in which the inner ring chamber C36 is communicated with the atmosphere and the inner ring chamber C36 is disconnected from the annular chamber B35 by switching the switching plunger 50 in the passage 40.
As shown in fig. 1 and 4, as a preferable feature of the present embodiment, the switching plunger 50 provided in the present embodiment may have a cylindrical structure or a square structure, as long as it is ensured to slide along the switching passage 40, and has a connection hole 511 communicating with the connection passage 510 in a lateral direction of the connection passage 510, and a control hole one K1 communicating with the inner ring chamber C36, a control hole two K2 communicating with the ring chamber B35, and a control hole three K3 communicating with the external atmosphere in a lateral direction of the switching passage 40, so that by the sliding movement of the switching plunger 50 in the switching passage 40, in the first pressure state, the control hole three K3 is blocked by the switching plunger 50 and the control hole two K2 is communicated with the switching passage 40, and at this time, the control hole two K2 is communicated with the control hole one K1 through the switching passage 40, thereby ensuring that the inner ring chamber C36 is communicated with the ring chamber B35; in the second pressure state, the control hole two K2 is blocked by the switching plunger 50, the connecting hole 511 is correspondingly communicated with the control hole three K3, and the control hole three K3 is communicated with the control hole one K1 through the connecting channel 510 and the switching channel 40, so that the communication between the ring chamber C and the external atmosphere is ensured, and the output pressure is reduced.
Specifically, the shift plunger 50 can slide in a direction close to or far from the first control hole K1, and the sliding direction of the shift plunger 50 is perpendicular to the length direction of the piston rod 31, that is, the shift plunger 50 slides in the switching channel 40 to control the opening or closing of the second control hole K2 or the third control hole K3, so as to control the connection or disconnection between the inner ring chamber C36 and the annular chamber B35, and the connection or disconnection between the control ring chamber C and the external atmosphere.
Further, a first annular groove 71 is formed around the outer surface of the piston seat 32, and the depth direction of the first annular groove 71 extends along one side close to the middle piston rod 31; a second annular groove 72 corresponding to the first annular groove 71 is formed in the side wall of the valve body 10 surrounding the pilot chamber 13, and the depth direction of the second annular groove 72 extends along one side far away from the middle piston rod 31; the piston assembly 30 further comprises an elastic connecting element 70, one end of the elastic connecting element 70 is embedded in the first annular groove 71, the other end of the elastic connecting element 70 is embedded in the second annular groove 72, and the elastic connecting element 70 forms two independent sealed chambers between the annular chamber A34 and the annular chamber B35. With the above-described structure, the elastic connection member 70 functions to enable the annular chamber a34 and the annular chamber B35 to maintain good sealability on the one hand, and to have a tendency to return the relay valve to the normal pressure state (normal pressure state shown in fig. 1) when the relay valve is in the pressure rising position or the pressure falling position according to the change in the pilot pressure on the other hand.
That is, when the pilot pressure delivered to the annular chamber B35 through the pilot channel increases, the piston seat 32 drives the piston rod 31 to move toward the output chamber 12, so that the piston rod 31 abuts against the valve rod 21 and drives the valve rod 21 to move along the length direction of the valve rod 21, so that the valve rod 21 opens the first valve port 14, the input chamber 11 communicates with the output chamber 12, and the relay valve output pressure is in an increasing state. When the pilot pressure transmitted through the pilot passage decreases, the elastic connection element 70 drives the piston seat 32 to move away from the output chamber 12, and the piston rod 31 is separated from the second annular sealing element 222, so that the output chamber 12 is communicated with the external atmosphere through the inner through hole 211 of the valve rod 21 and the connecting through hole 311 of the piston rod 31, and the output pressure of the relay valve is in a decreasing state.
In order to avoid or reduce the abrasion of the elastic connecting piece 70 and the valve body 10 in the working process, the elastic connecting piece 70 is a planar diaphragm plate, and compared with the existing rubber diaphragm plate with wave folding, the planar diaphragm plate can increase the control precision of the diaphragm plate and reduce the friction between the diaphragm plate and the inner wall of the valve body 10.
The valve body 10 provided in this embodiment is provided with an exhaust hole 16, the exhaust hole 16 is close to the pre-control chamber 13 and is used for communicating the pre-control chamber 13 with the external atmosphere, and the piston rod 31 is slidably inserted into the exhaust hole 16 and seals the exhaust hole 16. That is, the piston rod 31 is inserted into the exhaust hole 16 and closes the exhaust hole 16, the pre-control chamber 13 is a closed space, and the output chamber 12 is communicated with the external atmosphere through the inner through hole 211 of the valve rod 21 and the connection through hole 311 of the piston rod 31.
Further, in this embodiment, the inner walls of the valve body 10 of the exhaust hole 16, the valve body 10 of the first valve port 14, and the valve body 10 of the second valve port 15 are respectively provided with the sealing ring 80, so that the sealing effect of the piston rod 31, the valve rod 21, and the valve body 10 is better, and the sealing performance of the input cavity 11, the output cavity 12, and the pre-control cavity 13 is further improved.
In this embodiment, the piston step 33 is provided with a rubber ring groove 81, and the rubber ring groove 81 surrounds the outer surface of the piston step 33; a sealing ring 80 is embedded in the sealing ring groove 81, and the sealing ring 80 enables the annular chamber B35 and the inner ring chamber C36 to form two independent sealed chambers. With the above structure, the lower side of the piston seat 32 is divided into two areas, one of which is the area of the top plane of the piston step 33 near the inner ring chamber C36 is S2, and the other of which is the area of the bottom surface 331 of the piston step 33 near the ring chamber B35 is S1-S2, so that when the pilot pressure is maintained, the distribution area of the pilot pressure can be switched by the switching plunger 50, and the purpose of reducing the output pressure is achieved.
In order to ensure the accuracy of the switching output pressure, at least two rubber rings 51 are sleeved on the outer side of the switching plunger 50, and in this embodiment, four rubber rings 51 are sleeved on the switching plunger 50 as an example, so that a sealing connection is formed between the switching plunger 50 and the switching channel 40; preferably, the connection hole 511 is located between at least two rubber rings 51, the rubber rings 51 are used for blocking the control hole three K3 and the connection hole 511 in the first pressure state, and the rubber rings 51 are used for blocking the control hole two K2 in the second pressure state, so as to ensure the accuracy of switching the output pressure.
The working principle of the embodiment of the invention is as follows: as shown in fig. 1 and 5, when the relay valve is operated, the external device supplies the total wind pressure into the input chamber 11 through the wind source input passage 110, supplies the pilot pressure into the pilot chamber 13 through the pilot passage 130, and discharges the output pressure to the outside through the wind source output passage 120 from the output chamber 12. When the pre-control pressure rises, the pressure in the annular chamber B35 rises, the piston seat 32 is pushed to move to one side close to the second valve port 15, the piston rod 31 is abutted against the valve rod 21 and pushes the valve rod 21 to move upwards, the first valve port 14 is opened, therefore, the pressure in the input chamber 11 enters the output chamber 12 through the first valve port 14 and is transmitted to external equipment through the air source output passage 120, the pressure in the air source output passage 120 rises, and the relay valve is in a pressure rising position; when the pilot pressure decreases, the pressure in the annular chamber B35 on the lower side of the piston seat 32 decreases, pushing the piston seat 32 to move to the side away from the second valve port 15, the output chamber 12 communicates with the outside atmosphere, and the relay valve output pressure is in a decreasing state.
When the pre-control pressure is kept, because the annular chamber A34 on the side of the piston seat 32 close to the output chamber 12 is communicated with the air source output passage 120, the pressure in the annular chamber A34 is kept consistent with the pressure in the annular chamber B35, the piston seat 32 is pushed to move to the middle position, the first valve port 14 and the second valve port 15 are both in a closed state, at the moment, the input chamber 11 and the output chamber 12 are in a closed state, the output chamber 12 is disconnected from the external atmosphere, the output pressure is kept unchanged, and the relay valve is in a first pressure position state (a normal pressure position state);
the technical scheme is more critical that in a normal pressure state, the conversion plunger 50 is placed at a right limit position (normal pressure state), at the moment, the control hole I K1 is communicated with the control hole II K2, the control hole III K3 is positioned in the middle of the rubber ring 51 at the right side of the conversion plunger 50 and is blocked, so that the inner ring chamber C36 of the relay valve is communicated with the annular chamber B35, the inner ring chamber C36 is disconnected with the atmosphere, and at the moment, the pressure areas borne by the upper side of the piston seat 32 and the lower side of the piston seat 32 are the same and are S1; at this time, after the piston seat 32 is balanced, the force balance formula is:
Ps×S1＝Py×S1，
so Ps-Py, where Ps-output pressure; py-pre-control pressure, i.e. the output pressure is the same as the pre-control pressure;
when lower output pressure is needed, the switching plunger 50 is placed at a left limit position (low pressure state), at this time, the control hole two K2 is positioned in the middle of the rubber ring 51 at the left side of the switching plunger 50 and is blocked, the control hole three K3 is correspondingly communicated with the connecting hole 511 of the switching plunger 50, so that the control hole one K1 is communicated with the atmosphere through the connecting passage 510 of the switching plunger 50, the connecting hole 511 and the control hole three K3, so that the inner ring chamber C36 of the relay valve is communicated with the atmosphere, and the inner ring chamber C36 is disconnected from the annular chamber B35, at this time, the pre-control pressure can only enter the annular chamber B35 and cannot enter the inner ring chamber C36, the pressure area on the lower side of the piston seat 32 is S1-S2, and after the piston seat 32 is balanced, the force balance formula is as follows:
Ps×S1＝Py×(S1-S2)
Ps＝Py×(S1-S2)/S1
Ps＝Py-Py×(S2/S1)
ps — output pressure; py-pre-control pressure;
the formula shows that Py x (S2/S1) is always greater than 0, and the output pressure Ps is always less than the pilot control pressure Py, so that the aim of reducing the output pressure can be effectively fulfilled, and the technical scheme is used for an output circuit of a railway vehicle braking system to output large-flow compressed air with the same pilot control pressure; the switching channel 40 and the switching plunger 50 positioned in the switching channel 40 can also switch and output large-flow compressed air with pressure lower than the pre-control pressure, so that the purpose of reducing the output pressure is achieved.
In summary, the relay valve of the present invention adds the inwardly retracted piston step 33 on the lower side of the piston seat 32, and the sealing ring 80 is sleeved on the piston step 33, so that the lower side of the piston seat 32 is divided into two areas, and two independent sealed chambers, namely, an annular chamber B35 and an inner ring chamber C36, are formed, which can accurately and rapidly control the braking pressure; meanwhile, a switching channel 40 communicated with the inner ring cavity C36 is arranged in the lateral direction of the inner ring cavity C36, and through the design of a conversion plunger 50 arranged in the switching channel 40 and a rubber ring 51 sleeved on the conversion plunger 50, high-flow compressed air with lower than pre-control pressure can be output through conversion, so that the purpose of reducing output pressure is achieved, the operation requirement of the locomotive brake system during unpowered loopback is met, the locomotive brake system has good application prospect and popularization and application value in the technical field of railway vehicle brake systems, and is suitable for popularization and application.
The present invention has been described in terms of the preferred embodiment, and it is not intended to be limited thereto. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A relay valve capable of outputting two pressures is characterized in that: an output circuit for a railway vehicle braking system comprising a valve body, a valve stem assembly, a reset assembly and a piston assembly;
the valve body is internally provided with an input cavity, an output cavity, a pre-control cavity, a wind source input passage communicated with the input cavity, a wind source output passage communicated with the output cavity and a pre-control passage communicated with the pre-control cavity;
the valve rod assembly comprises a valve rod and a sealing element sleeved outside the valve rod, the valve rod extends from the input cavity to the pre-control cavity through the output cavity and is slidably arranged in the valve body along the extending direction of the valve rod, the valve rod is provided with an inner through hole penetrating through the valve rod along the length direction of the valve rod, so that a first valve port is formed between the input cavity and the output cavity, and a second valve port is formed between the output cavity and the pre-control cavity;
the resetting component is positioned between the valve body and the valve rod component and is used for driving the valve rod component to close the first valve port;
the piston assembly comprises a piston rod and a piston seat fixedly sleeved on the piston rod, the piston rod is slidably inserted into the second valve port and is abutted against the valve rod, the piston rod is provided with a connecting through hole penetrating along the length direction of the piston rod, and the connecting through hole is communicated with the external atmosphere; the piston assembly is positioned in the pre-control cavity, and an annular cavity A is formed on one side, close to the output cavity, of the piston seat, so that the wind source output passage is communicated with the annular cavity A; a piston step which is arranged in a concave manner is arranged on one side, away from the output cavity, of the piston seat, and an annular chamber B is formed between the bottom surface of the step of the piston step and the valve body, so that the pre-control passage is communicated with the annular chamber B; an inner ring chamber C is formed between the inner side of the piston step and the piston rod, a switching channel communicated with the inner ring chamber C is arranged in the lateral direction of the inner ring chamber C, a switching plunger is slidably arranged in the switching channel, and the relay valve has a first pressure state that the inner ring chamber C is communicated with the annular chamber B and is disconnected from the atmosphere through the switching plunger in the switching channel; the relay valve has a second pressure state in which the inner ring chamber C is communicated with the atmosphere and the inner ring chamber C is disconnected from the annular chamber B by a switching plunger in the switching passage; the switching plunger extends into the switching channel, a connecting channel communicated with the switching channel is arranged on the inner side of one end of the switching channel, a connecting hole communicated with the connecting channel is arranged on the lateral side of the connecting channel, a first control hole used for communicating an inner ring cavity C, a second control hole used for communicating an annular cavity B and a third control hole used for communicating external atmosphere are arranged on the lateral side of the switching channel, so that in the first pressure state, the third control hole is sealed by the switching plunger and is communicated with the switching channel; so that in the second pressure state, the control hole II is blocked by the conversion plunger and the connecting hole is correspondingly communicated with the control hole III.
2. The relay valve capable of outputting two pressures according to claim 1, wherein: the conversion plunger can slide in a direction close to or far away from the control hole, and the sliding direction of the conversion plunger is perpendicular to the length direction of the piston rod.
3. The relay valve capable of outputting two pressures according to claim 1, wherein: at least two rubber rings are sleeved on the outer side of the conversion plunger piston, so that the conversion plunger piston is in sealing connection with the switching channel.
4. The relay valve capable of outputting two pressures according to claim 3, wherein: the connecting hole is positioned between at least two rubber rings.
5. The relay valve capable of outputting two pressures according to any one of claims 1 to 4, wherein: the seal comprises a first annular seal positioned within the input chamber and cooperating with the sliding movement of the valve stem to close the valve port.
6. The relay valve capable of outputting two pressures according to claim 5, wherein: the seal also includes a second annular seal located in the output chamber and cooperating with the sliding movement of the valve stem to close the second valve port.
7. The relay valve capable of outputting two pressures according to claim 1, wherein: the valve body is provided with an exhaust hole, the exhaust hole is close to the pre-control cavity and is used for communicating the pre-control cavity with the external atmosphere, and the piston rod is slidably inserted into the exhaust hole and seals the exhaust hole.
8. The relay valve capable of outputting two pressures according to claim 1, wherein: a first annular groove is formed around the outer surface of the piston seat, and the depth direction of the first annular groove extends along one side close to the middle piston rod; a second annular groove corresponding to the first annular groove is formed in the side wall of the valve body surrounding the pre-control cavity, and the depth direction of the second annular groove extends along one side far away from the middle piston rod; the piston assembly further comprises an elastic connecting piece, one end of the elastic connecting piece is embedded in the first annular groove, the other end of the elastic connecting piece is embedded in the second annular groove, and the elastic connecting piece enables two independent sealed chambers to be formed between the annular chamber A and the annular chamber B.
9. The relay valve capable of outputting two pressures according to claim 1, wherein: a rubber ring groove is arranged on the piston step and surrounds the outer surface of the piston step; and a sealing ring is embedded in the rubber ring groove, and the sealing ring enables the annular cavity B and the inner ring cavity C to form two independent sealed cavities.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010655190.6A CN111762142B (en) | 2020-07-09 | 2020-07-09 | Relay valve capable of outputting two pressures |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010655190.6A CN111762142B (en) | 2020-07-09 | 2020-07-09 | Relay valve capable of outputting two pressures |
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| CN111762142A CN111762142A (en) | 2020-10-13 |
| CN111762142B true CN111762142B (en) | 2021-06-18 |
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| CN113911093B (en) * | 2021-10-28 | 2022-10-04 | 眉山中车制动科技股份有限公司 | Relay valve jumping mechanism |
| WO2023070416A1 (en) * | 2021-10-28 | 2023-05-04 | 眉山中车制动科技股份有限公司 | Relay valve |
| CN114771596B (en) * | 2022-04-22 | 2024-05-24 | 中国国家铁路集团有限公司 | Relay valve capable of performing multistage pressure output and railway vehicle braking system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103921780A (en) * | 2014-04-16 | 2014-07-16 | 天津机辆轨道交通装备有限责任公司 | Double-proportion relay valve |
| CN104309602B (en) * | 2014-10-16 | 2016-08-24 | 眉山中车制动科技股份有限公司 | A kind of relay valve with empty and load brake-cylinder pressure adjustment function |
| CN206254997U (en) * | 2016-11-29 | 2017-06-16 | 中车齐齐哈尔车辆有限公司 | A kind of railway freight-car and its relay valve |
| CN206383947U (en) * | 2017-01-23 | 2017-08-08 | 中车青岛四方车辆研究所有限公司 | Double ratio relay valves |
| CN107499300B (en) * | 2017-08-17 | 2019-11-05 | 中车青岛四方车辆研究所有限公司 | Multichannel pre-control relay valve |
| CN110949351A (en) * | 2019-12-18 | 2020-04-03 | 眉山中车制动科技股份有限公司 | Vehicle electro-pneumatic brake control device |
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