CN101531184A - Rail transportation vehicle electropneumatic brake unit based on piezoelectric proportional valve - Google Patents
Rail transportation vehicle electropneumatic brake unit based on piezoelectric proportional valve Download PDFInfo
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- CN101531184A CN101531184A CN200910029819A CN200910029819A CN101531184A CN 101531184 A CN101531184 A CN 101531184A CN 200910029819 A CN200910029819 A CN 200910029819A CN 200910029819 A CN200910029819 A CN 200910029819A CN 101531184 A CN101531184 A CN 101531184A
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- 230000001105 regulatory effect Effects 0.000 claims description 6
- 230000005611 electricity Effects 0.000 description 7
- 230000001276 controlling effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000007850 degeneration Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
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Abstract
The invention relates to a rail transportation vehicle electropneumatic brake unit based on a piezoelectric proportional valve, which is characterized by mainly comprising the piezoelectric proportional valve (4) and a relay valve (5), wherein the relay valve (5) comprises a valve body (11) and a piston type check valve (10), an air chamber (6) is arranged in the valve body (11), a diaphragm (7) is arranged in the air chamber (6) and is connected with a limit stop (8) which is connected with a mandril (9), the lower end of the mandril (9) passes through an adjusting air chamber C to be opposite to the upper end of the check valve (10), the center of the mandril is provided with an inner hole (12), the check valve (10) is also provided with a return spring (13), the valve body (11) is provided with an air inlet passage (14) which is communicated with the adjusting air chamber C and an air inlet (1) of the piezoelectric proportional valve (4) simultaneously and a brake cylinder air passage (15) which is communicated with the adjusting air chamber C and an air chamber B simultaneously, an air outlet (2) of the piezoelectric proportional valve (4) is communicated with an air chamber A, and an exhaust port (3) of the piezoelectric proportional valve (4) is communicated with the atmosphere. The rail transportation vehicle electropneumatic brake unit has the advantages of simple structure, convenient control, small volume, long service life and quick response.
Description
Technical field
The present invention relates to a kind of track traffic equipment, the speed-slackening signal TCU transfer control unit in especially a kind of high speed train and the urban track traffic Pneumatic brake systems, specifically a kind of rail transportation vehicle electropneumatic brake unit based on piezoelectric proportional valve.
Background technology
Many institutes hit and know that electropneumatic brake unit is the core component of high speed train and city rail vehicle Pneumatic brake systems, and its effect is the air pressure value that the electric signal of control brake is converted to the control vehicle braking force.Used electropneumatic brake unit is converted to electric signal towards the brake-cylinder pressure value need pass through analog-converted valve, emergency valve, weighing valve, a plurality of links of relay valve.Wherein, the analog-converted valve is converted to electric signal the air pressure signal of control relay valve, emergency valve, weighing valve provide a maximum gas pressure signal of controlling relay valve for emergency brake of vehicle, and relay valve is converted to the air pressure signal of low discharge the brake-pressure air of big flow.The gas circuit of relay valve is longer because air pressure signal flows to, and link is many, and the control signal on the relay valve has certain decay and hysteresis, influences the response and the control accuracy of relay valve; Control the inconsistency and the degeneration of the elastic element characteristic in the gas circuit on the other hand, need often its controller characteristic curve to be adjusted.The mode of air pressure signal changed electric signal by the analog-converted valve: a kind of is that electric signal is amplified the valve generation air pressure signal that promotes the control gas circuit by the magnetic force of coil; Another kind is to produce air pressure signal with 2 or 4 two-bit triplet electromagnetic valves filling according to certain rules, exhaust.Above factor makes electropneumatic brake unit gas circuit complexity, volume and weight big, and the power that drives electromagnetic valve is big, has heating and electromagnetic interference etc., the mode complexity, and precision is lower.
Summary of the invention
The objective of the invention is at existing electropneumatic brake unit gas circuit complexity, volume and weight big, the power that drives electromagnetic valve is big, there are heating and electromagnetic interference, mode complexity, a series of problems such as precision is lower, it is long to invent a kind of big electric current, high voltage drive, life-span of not needing, and control is convenient, does not have the dead band, pressure can be started from scratch and be regulated continuously, and response is fast, precision is high, the rail transportation vehicle electropneumatic brake unit based on piezoelectric proportional valve that can form closed loop control.
Technical scheme of the present invention is:
A kind of rail traffic vehicle braking electricity dummy cell based on piezoelectric proportional valve, it is characterized in that it mainly is made up of piezoelectric proportional valve 4 and relay valve 5, relay valve 5 comprises valve body 11 and the piston type check valve 10 that is installed on the valve body 11, be provided with air chamber 6 in the valve body 11, be equipped with in the air chamber 6 it is divided into A, the diaphragm 7 of two air chambers of B, diaphragm 7 is connected with limiting stopper 8, limiting stopper 8 links to each other with push rod 9, it is relative with the upper end of check valve 10 that adjusting air chamber C is passed in the lower end of push rod 9, check valve 10 is fixedly mounted on the valve body 11, its center is provided with one and communicates with atmosphere, and have can be by the endoporus 12 of the lower valve port switch of push rod 9, in the annular groove in the outside of check valve 10, retracing spring 13 is installed, on valve body 11, be provided with air inlet gas circuit 14 that communicates with the admission port 1 of regulating air chamber C and piezoelectric proportional valve 4 simultaneously and the brake cylinder gas circuit 15 that communicates with adjusting air chamber C and air chamber B simultaneously, the output gas port 2 of described piezoelectric proportional valve 4 communicates with air chamber A, and the exhausr port 3 of piezoelectric proportional valve 4 communicates with atmosphere.
On the air inlet gas circuit 14 of the admission port 1 that leads to piezoelectric proportional valve 4, filter 16 is installed.
The annular groove of the mounting spring 13 in described check valve 10 outsides communicates with air chamber B by the gas circuit that offers on the valve body 1.
Described air chamber B be equipped with collection wherein pressure and be sent to the pressure sensor 17 that control system realizes closed loop control.
Beneficial effect of the present invention:
The present invention is by being directly embedded into the piezoelectricity proportional dump valve in the integrating device of a custom-designed relay valve, control circuit can be added on the piezoelectricity proportional dump valve according to the electric signal of processings back generations such as the load signal of braking requirement signal (commonly used, keep, urgent, dynamic brake), vehicle (unloaded, fully loaded etc.), speed signal, directly produce control relay valve air pressure signal by the piezoelectricity proportional dump valve, reduce electric gas circuit and the elastic link that dallies in changing.The piezoelectricity proportional dump valve both can be operated in continuous regulative mode, also can work in the pulse regulation mode.
Among the present invention, braking requirement signal after the controlling unit of piezoelectric type electricity dummy cell will be handled is converted to the air pressure signal that drives relay valve by output piezoelectricity proportional dump valve, reduced gas circuit and the elastic link of traditional electrical idle running in changing, simple in structure, reliability is high; And replace electromagnetic valve with piezo electric valve, and no longer need big electric current, high voltage drive, life-span long, control is convenient, does not have the dead band, the pressure adjusting continuously of can starting from scratch; And electric dummy cell forms closed loop control by controlling unit, and Whole Response is fast, precision is high.
Description of drawings
Fig. 1 is the structural representation of piezoelectric proportional valve of the present invention.
Fig. 2 is the structural representation of piezoelectric type of the present invention electricity dummy cell when working in relieved state.
Fig. 3 is the structural representation of piezoelectric type of the present invention electricity dummy cell when working in braking mode.
Fig. 4 is the structural representation of piezoelectric type of the present invention electricity dummy cell when working in packing state.
The specific embodiment
The present invention is further illustrated below in conjunction with drawings and Examples.
Shown in Fig. 1-5.
A kind of rail transportation vehicle electropneumatic brake unit based on piezoelectric proportional valve, it mainly is made up of piezoelectric proportional valve 4 (can adopt commercially available piezoelectric type pneumatic proportional valve to be realized) and relay valve 5, the structure of piezoelectric proportional valve 4 as shown in Figure 1, it can adopt the open type structure, also can adopt the closed type structure, both control circuits are slightly had any different, and its mode can adopt prior art or be realized according to its service instructions.Relay valve 5 is integration modules, it comprises valve body 11 and the piston type check valve 10 that is installed on the valve body 11, on piston type check valve 10, be set with seal ring 18, be provided with air chamber 6 in the valve body 11, be equipped with in the air chamber 6 it is divided into A, the diaphragm 7 of two air chambers of B, diaphragm 7 is connected with and limits its upper and lower displacement, prevent the limiting stopper 8 of its vibration, limiting stopper 8 links to each other with push rod 9, limiting stopper 8 can be the branch body structure with push rod 9, also can be integral structure, it is relative with the upper end of check valve 10 that adjusting air chamber C is passed in the lower end of push rod 9, check valve 10 is fixedly mounted in the valve body 11 of relay valve 5, its center is provided with one and communicates with atmosphere, and have can be by the endoporus 12 of the lower valve port switch of push rod 9, in the annular groove in the outside of check valve 10, retracing spring 13 is installed, on valve body 11, be provided with air inlet gas circuit 14 that communicates with the admission port 1 of regulating air chamber C and piezoelectric proportional valve 4 simultaneously and the brake cylinder gas circuit 15 that communicates with adjusting air chamber C and air chamber B simultaneously, the output gas port 2 of described piezoelectric proportional valve 4 communicates with air chamber A, and the exhausr port 3 of piezoelectric proportional valve 4 communicates with atmosphere.As shown in Figure 2.During concrete enforcement, a filter 16 can be installed on the air inlet gas circuit 14 of the admission port 1 that leads to piezoelectric proportional valve 4 in order to prevent that impurity from entering in the piezoelectric proportional valve 4.In addition, for easy to adjust, the annular groove of the mounting spring 13 in check valve 10 outsides is communicated with air chamber B by the gas circuit of being offered on the valve body 1.In order to realize that closed loop accurately controls, also can in air chamber B, install a collection wherein pressure and be sent to the pressure sensor 17 that control system realizes closed loop control.
The principle of work of each station of the present invention is as follows:
One, alleviates the position principle of work
When control signal was relieved state, piezoelectricity proportional dump valve admission port was a closed condition, all logical atmosphere of air chamber A, B, and diaphragm and push rod are Fig. 2 state, check valve is closed braking reservoir and brake cylinder gas circuit under the effect of spring and braking reservoir; Push rod lower valve port and check valve have certain distance, and brake cylinder leads to atmosphere by gap, the check valve in-core hole of push rod lower valve port and check valve upper surface, as shown in Figure 2.
Two, retarder location principle of work
Fig. 3 is a piezoelectric type electricity dummy cell braking mode scheme drawing.When control signal is a glancing impact, the valve block of piezoelectricity proportional dump valve is according to control signal flexural deformation, in the A air chamber, obtain one and the proportional force value of control signal, and promote elastic memberance and push rod moves down, at first be pressed on the path that the check valve upper surface is closed air chamber C and atmosphere by the push rod lower valve port, continuing to move down the promotion check valve moves down, connect braking reservoir and brake cylinder path, the pressed gas of braking reservoir enters brake cylinder and air chamber B by the gap of valve port on the check valve and valve seat, air chamber B gas equilibrium diaphragm, force value in the brake cylinder is regulated by the displacement of check valve, and pressure sensor feeds back to controller to realize the accuracy control of pressure with the force value of brake cylinder.
Three, pressurize position principle of work
Fig. 4 piezoelectric type electricity dummy cell braking mode scheme drawing.When brake-pressure reached specified value, controller was regulated the A air chamber pressure, under the effect of B air chamber and check valve spring force, the dislocation check valve is closed on diaphragm and the push rod, push rod lower valve port and in the closed position above the check valve makes brake-cylinder pressure remain unchanged state, i.e. pressurize.
If will reduce brake-pressure, then to regulate the A air chamber pressure and make on diaphragm and the push rod and move, the push rod lower valve port produces certain interval with the check valve upper surface, makes gas in the brake cylinder by a part of atmosphere that arrives of check valve mesopore row, up to setting up new balance.
The part that the present invention does not relate to prior art that maybe can adopt all same as the prior art is realized.
Claims (4)
1, a kind of rail transportation vehicle electropneumatic brake unit based on piezoelectric proportional valve, it is characterized in that it mainly is made up of piezoelectric proportional valve (4) and relay valve (5), relay valve (5) comprises valve body (11) and is installed in piston type check valve (10) on the valve body (11), be provided with air chamber (6) in the valve body (11), be equipped with in the air chamber (6) it is divided into A, the diaphragm (7) of two air chambers of B, diaphragm (7) is connected with limiting stopper (8), limiting stopper (8) links to each other with push rod (9), it is relative with the upper end of check valve (10) that adjusting air chamber C is passed in the lower end of push rod (9), check valve (10) is fixedly mounted in the valve body (11), its center is provided with one and communicates with atmosphere, and be provided with can be by the endoporus (12) of the lower valve port switch of push rod (9), in the annular groove in the outside of check valve (10), retracing spring (13) is installed, on valve body (11), be provided with air inlet gas circuit (14) that communicates with the admission port (1) of regulating air chamber C and piezoelectric proportional valve (4) simultaneously and the brake cylinder gas circuit (15) that communicates with adjusting air chamber C and air chamber B simultaneously, the output gas port (2) of described piezoelectric proportional valve (4) communicates with air chamber A, and the exhausr port (3) of piezoelectric proportional valve (4) communicates with atmosphere.
2, the rail transportation vehicle electropneumatic brake unit based on piezoelectric proportional valve according to claim 1 is characterized in that on the air inlet gas circuit (14) of the admission port (1) that leads to piezoelectric proportional valve (4) filter (16) being installed.
3, the rail transportation vehicle electropneumatic brake unit based on piezoelectric proportional valve according to claim 1 is characterized in that the annular groove of the mounting spring (13) in described check valve (10) outside communicates with air chamber B by the gas circuit that offers on the valve body (1).
4, the rail transportation vehicle electropneumatic brake unit based on piezoelectric proportional valve according to claim 1, it is characterized in that described air chamber B be equipped with collection wherein pressure and be sent to the pressure sensor (17) that control system realizes closed loop control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910029819A CN101531184A (en) | 2009-03-25 | 2009-03-25 | Rail transportation vehicle electropneumatic brake unit based on piezoelectric proportional valve |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910029819A CN101531184A (en) | 2009-03-25 | 2009-03-25 | Rail transportation vehicle electropneumatic brake unit based on piezoelectric proportional valve |
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| CN101531184A true CN101531184A (en) | 2009-09-16 |
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| CN200910029819A Pending CN101531184A (en) | 2009-03-25 | 2009-03-25 | Rail transportation vehicle electropneumatic brake unit based on piezoelectric proportional valve |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102717814A (en) * | 2012-06-30 | 2012-10-10 | 中国北车集团大连机车车辆有限公司 | Locomotive cock |
| CN103273919A (en) * | 2013-06-19 | 2013-09-04 | 上海南济轨道设备科技开发有限公司 | Air-electric hybrid brake system and air brake control device thereof |
| CN108883759A (en) * | 2016-02-10 | 2018-11-23 | 克诺尔商用车制动***有限公司 | The relaying valve gear of pneumatic type or Electropneumatic vehicle braking device |
-
2009
- 2009-03-25 CN CN200910029819A patent/CN101531184A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102717814A (en) * | 2012-06-30 | 2012-10-10 | 中国北车集团大连机车车辆有限公司 | Locomotive cock |
| CN103273919A (en) * | 2013-06-19 | 2013-09-04 | 上海南济轨道设备科技开发有限公司 | Air-electric hybrid brake system and air brake control device thereof |
| CN103273919B (en) * | 2013-06-19 | 2015-10-21 | 上海南济轨道设备科技开发有限公司 | A kind of empty electric composite braking system and air-brake controlling device thereof |
| CN108883759A (en) * | 2016-02-10 | 2018-11-23 | 克诺尔商用车制动***有限公司 | The relaying valve gear of pneumatic type or Electropneumatic vehicle braking device |
| CN108883759B (en) * | 2016-02-10 | 2021-03-12 | 克诺尔商用车制动***有限公司 | Relay valve arrangement for a pneumatic or electropneumatic motor vehicle brake system |
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Application publication date: 20090916 |