阅读说明：本技术 具有振动抑制功能的燃料电池汽车高速电动空气压缩机 (High-speed electric air compressor with vibration suppression function for fuel cell automobile ) 是由 周稼铭 何洪文 李建威 衣丰艳 胡东海 衣杰 于 2020-12-24 设计创作，主要内容包括：本发明公开了一种具有振动抑制功能的燃料电池汽车高速电动空气压缩机,空压机本体为离心式空气压缩机；空气网管与空压机本体的出气口连接；泄压罐与空气网管连通；泄压罐与空气网管之间设有第一电磁阀；泄压罐安装在空气网管靠近空压机本体的出口处的一端；第一压力传感器安装在空压机本体的出气口处；第二压力传感器安装在空气网管内；首先获取氢氧燃料电池在当前或预测的下一时刻工况下对应的空压机本体的目标压力；当第二压力大于第一压力时,第一电磁阀打开,使第二压力低于第一压力与目标压力中的较小值；调节空压机本体的转速,使第一压力趋近于目标压力。本发明能够解决离心式空气压缩机所产生的喘振问题。(The invention discloses a high-speed electric air compressor of a fuel cell automobile with a vibration suppression function, wherein an air compressor body is a centrifugal air compressor; the air net pipe is connected with an air outlet of the air compressor body; the pressure relief tank is communicated with the air net pipe; a first electromagnetic valve is arranged between the pressure relief tank and the air network pipe; the pressure relief tank is arranged at one end of the air network pipe close to the outlet of the air compressor body; the first pressure sensor is arranged at an air outlet of the air compressor body; the second pressure sensor is arranged in the air network pipe; firstly, acquiring target pressure of an air compressor body corresponding to the hydrogen-oxygen fuel cell under the current or predicted working condition at the next moment; when the second pressure is higher than the first pressure, the first electromagnetic valve is opened, so that the second pressure is lower than the smaller value of the first pressure and the target pressure; and adjusting the rotating speed of the air compressor body to enable the first pressure to approach the target pressure. The invention can solve the surge problem generated by the centrifugal air compressor.)

1. A high-speed electric air compressor of a fuel cell automobile with vibration suppression function is characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,

the air compressor comprises an air compressor body (1), wherein the air compressor body (1) is a centrifugal air compressor;

the air network pipe (2), the air network pipe (2) is connected with the air outlet of the air compressor body (1), and the air network pipe (2) is also used for being connected with a hydrogen-oxygen fuel cell (5);

the pressure relief tank (3), the pressure relief tank (3) is communicated with the air net pipe (2); a first electromagnetic valve (4) is arranged between the pressure relief tank (3) and the air network pipe (2); the pressure relief tank (3) is arranged at one end of the air network pipe (2) close to the outlet of the air compressor body (1);

the first pressure sensor is arranged at the air outlet of the air compressor body (1) and used for detecting the pressure at the air outlet of the air compressor body (1) and recording the pressure as a first pressure;

the second pressure sensor is arranged in the air network pipe (2) and used for detecting the pressure in the air network pipe (2) and recording the pressure as a second pressure;

when the device is used, the target pressure of the air compressor body (1) corresponding to the hydrogen-oxygen fuel cell (5) under the current or predicted working condition at the next moment is obtained;

when the second pressure is greater than the first pressure, the first solenoid valve (4) is opened, so that the second pressure is lower than the smaller value of the first pressure and the target pressure; adjusting the rotating speed of the air compressor body (1) to enable the first pressure to approach the target pressure;

and closing the first solenoid valve (4) after the first pressure is equal to the target pressure.

2. The high-speed electric air compressor for a fuel cell vehicle having a vibration suppressing function according to claim 1, characterized in that: an exhaust pipe (6) is arranged on the pressure relief tank (3), and a second electromagnetic valve (7) is arranged on the exhaust pipe (6);

the second electromagnetic valve (7) is used for being opened after the first electromagnetic valve (4) enters a closed state from an open state, and is closed after the pressure in the pressure relief tank (3) is equal to the external air pressure.

3. The high-speed electric air compressor for a fuel cell vehicle having a vibration suppressing function according to claim 2, characterized in that: a pressure relief cavity (8) is arranged in the pressure relief tank (3), and the volume of the pressure relief cavity (8) is adjustable.

4. The high-speed electric air compressor for a fuel cell vehicle having a vibration suppression function according to claim 3, characterized in that: adjusting the volume of the pressure relief cavity (8) to a target volume 0.5S before the first electromagnetic valve (4) is opened;

the calculation formula of the target volume is as follows:

wherein, V_TargetTo calculate the volume; p_NetIs the pressure in the air network pipe (2), namely the second pressure; v_NetIs the volume of the air mesh pipe (2); p_minIs the lesser of the first pressure and the target pressure.

5. The high-speed electric air compressor for a fuel cell vehicle having a vibration suppression function according to claim 4, characterized in that: a piston (9) is arranged in the pressure relief tank (3), and the piston (9) is connected with the inner wall of the pressure relief tank (3) in a sliding and sealing manner;

the piston (9) divides the pressure relief tank (3) into the pressure relief cavity (8) and the adjusting cavity (10);

the exhaust pipe (6) and the network pipe are both connected with the pressure relief cavity (8);

the adjusting cavity (10) is communicated with an external water source through a bidirectional pump (12); the external water source is water generated by the hydrogen-oxygen fuel cell (5) during operation; a third electromagnetic valve (11) is arranged on a pipeline connecting the adjusting cavity (10) and the bidirectional pump (12);

when the volume of the pressure relief cavity (8) is adjusted, when the volume of the pressure relief cavity (8) needs to be reduced, water is supplied into the adjusting cavity (10) through the bidirectional pump (12) to push the piston (9) to move to one side close to the pressure relief cavity (8) so as to reduce the volume of the pressure relief cavity (8);

when the volume of the pressure relief cavity (8) needs to be increased, pumping out the water in the adjusting cavity (10) through the bidirectional pump (12) to enable the piston (9) to move to the side close to the adjusting cavity (10) so as to reduce the volume of the pressure relief cavity (8); and closing the third solenoid valve (11) after the adjustment is finished.

6. The high-speed electric air compressor for a fuel cell vehicle having a vibration suppressing function according to claim 5, characterized in that: still be equipped with spring (13) in adjusting chamber (10), the one end of spring (13) with piston (9) are connected, the other end with the inner wall of pressure release jar (3) is connected.

7. The high-speed electric air compressor for a fuel cell vehicle having a vibration suppressing function according to claim 6, characterized in that: a flow meter (14) is also arranged on a pipeline connecting the adjusting cavity (10) and the bidirectional pump (12);

calculating the adjusting volume of the adjusting cavity (10) according to the total volume of the pressure relief tank (3), the target volume of the pressure relief cavity (8) and the current volume of the adjusting cavity (10), and calculating the target inflow or the target outflow of water in the adjusting cavity (10) according to the adjusting volume;

when the detection result of the flow meter (14) is equal to the target inflow amount or the target outflow amount, the bidirectional pump (12) is closed, and the third electromagnetic valve (11) is closed.

8. The high-speed electric air compressor for a fuel cell vehicle having a vibration suppressing function according to claim 7, characterized in that: an initial position is arranged in the pressure relief tank (3);

when the second solenoid valve (7) is open, the third solenoid valve (11) is open and the bidirectional pump (12) pumps water to bring the piston (9) at the initial position;

the initial position is a position where the number of target positions of the piston (9) in the pressure relief tank (3) is the largest when the N times of adjustment are carried out recently;

wherein N is an integer greater than 500.

9. The high-speed electric air compressor for a fuel cell vehicle having a vibration suppressing function according to claim 7, characterized in that: and during the last N times of adjustment, if the positions with the maximum occurrence frequency of the target positions are not less than two positions, taking the middle points of the positions at the two ends as initial positions.

Technical Field

The invention relates to the technical field of high-speed air compressors of fuel cell automobiles, in particular to a high-speed electric air compressor of a fuel cell automobile with a vibration suppression function.

Background

Because the emission is pollution-free and the energy efficiency is far higher than that of an internal combustion engine automobile, the hydrogen-oxygen fuel cell becomes the most ideal automobile power source at present.

An air compressor, which is an important part for supplying high-pressure air to an oxyhydrogen fuel cell vehicle, is required to compress air at an ultra-high rotation speed and supply the compressed air to a fuel cell.

In a centrifugal air compressor, a surge phenomenon is likely to occur at a high speed rotation. How to solve the problem of surge is one of the important problems to be solved urgently by the technical personnel in the field.

Disclosure of Invention

The invention aims to provide a high-speed electric air compressor of a fuel cell automobile with a vibration suppression function, which aims to solve the defects in the prior art and can solve the problem of surge generated by a centrifugal air compressor.

The invention provides a high-speed electric air compressor of a fuel cell automobile with a vibration suppression function, which comprises,

the air compressor comprises an air compressor body, a compressor body and a control device, wherein the air compressor body is a centrifugal air compressor;

the air network pipe is connected with an air outlet of the air compressor body and is also used for being connected with the hydrogen-oxygen fuel cell;

the pressure relief tank is communicated with the air net pipe; a first electromagnetic valve is arranged between the pressure relief tank and the air network pipe; the pressure relief tank is arranged at one end of the air network pipe close to the outlet of the air compressor body;

the first pressure sensor is arranged at the air outlet of the air compressor body and used for detecting the pressure at the air outlet of the air compressor body and recording the pressure as first pressure;

the second pressure sensor is arranged in the air network pipe and used for detecting the pressure in the air network pipe and recording the pressure as a second pressure;

when the device is used, firstly, the target pressure of the air compressor body corresponding to the hydrogen-oxygen fuel cell under the current or predicted working condition at the next moment is obtained;

when the second pressure is higher than the first pressure, the first electromagnetic valve is opened, so that the second pressure is lower than the smaller value of the first pressure and the target pressure; adjusting the rotating speed of the air compressor body to enable the first pressure to approach the target pressure;

and closing the first solenoid valve after the first pressure is equal to the target pressure.

The high-speed electric air compressor with the vibration suppression function for the fuel cell automobile is characterized in that the pressure relief tank is provided with a first electromagnetic valve;

the second electromagnetic valve is used for being opened after the first electromagnetic valve enters a closed state from an open state, and is closed after the pressure in the pressure relief tank is equal to the external air pressure.

The high-speed electric air compressor with the vibration suppression function for the fuel cell automobile is characterized in that a pressure relief tank is arranged in the pressure relief tank, and the volume of the pressure relief tank is adjustable.

The high-speed electric air compressor with the vibration suppression function for the fuel cell automobile is characterized in that the volume of the pressure relief cavity is adjusted to a target volume 0.5S before the first electromagnetic valve is opened;

the calculation formula of the target volume is as follows:

wherein, V_TargetTo calculate the volume; p_NetIs the pressure in the air network pipe, i.e. the second pressure; v_NetIs the volume of the air mesh tube; p_minThe lesser of the first pressure and the target pressure; wherein, V₀To compensate for the volume.

The high-speed electric air compressor with the vibration suppression function for the fuel cell automobile can be used for suppressing vibration of the fuel cell automobile, wherein optionally, a piston is arranged in the pressure relief tank and is in sliding sealing connection with the inner wall of the pressure relief tank;

the piston divides the pressure relief tank into a pressure relief cavity and an adjusting cavity;

the exhaust pipe and the network pipe are both connected with the pressure relief cavity;

the adjusting cavity is communicated with an external water source through a bidirectional pump; the external water source is water generated by the hydrogen-oxygen fuel cell during working; a third electromagnetic valve is arranged on a pipeline connecting the adjusting cavity and the bidirectional pump;

when the volume of the pressure relief cavity is adjusted, when the volume of the pressure relief cavity needs to be reduced, water is supplied into the adjusting cavity through the bidirectional pump so as to push the piston to move towards one side close to the pressure relief cavity, and the volume of the pressure relief cavity is reduced;

when the volume of the pressure relief cavity needs to be increased, pumping out the water in the adjusting cavity through the bidirectional pump, so that the piston moves to one side close to the adjusting cavity, and the volume of the pressure relief cavity is reduced; and closing the third solenoid valve after the adjustment is finished.

The high-speed electric air compressor with the vibration suppression function for the fuel cell automobile can be used for suppressing vibration of the fuel cell automobile, and can be used for suppressing vibration of the fuel cell automobile.

The high-speed electric air compressor with the vibration suppression function for the fuel cell automobile is characterized in that a pipeline connecting the adjusting cavity and the bidirectional pump is optionally provided with a flow meter;

calculating the adjusting volume of the adjusting cavity according to the total volume of the pressure relief tank, the target volume of the pressure relief cavity and the current volume of the adjusting cavity, and calculating the target inflow or the target outflow of water in the adjusting cavity according to the adjusting volume;

and when the detection result of the flow meter is equal to the target inflow amount or the target outflow amount, closing the bidirectional pump, and closing the third electromagnetic valve.

The high-speed electric air compressor with the vibration suppression function for the fuel cell automobile is characterized in that an initial position is optionally arranged in the pressure relief tank;

when the second solenoid valve is opened, the third solenoid valve is opened, and the bidirectional pump pumps water so that the piston is located at the initial position;

the initial position is a position where the target position in the pressure relief tank is the most frequently when the piston is adjusted for the last N times;

wherein N is an integer greater than 500.

The high-speed electric air compressor of the fuel cell automobile with the vibration suppression function is characterized in that the maximum number of times of the target positions is not less than two positions in the last N times of adjustment, and the midpoint of the two end positions is taken as the initial position.

Compared with the prior art, the invention has at least the following beneficial effects:

1. according to the invention, by arranging the pressure relief tank, when the air compressor needs to be decelerated and depressurized, the air network pipe is depressurized through the pressure relief tank, so that the pressure in the air network pipe is lower than the smaller of the target pressure and the pressure at the air outlet of the air compressor body. Therefore, when the air compressor is decelerated, the pressure in the air compressor is always greater than the pressure in the air network pipe, and the surge phenomenon caused by gas backflow is avoided.

2. Through setting the pressure release jar to the structure that the pressure release chamber is adjustable, can calculate according to the calculated result as required, through the volume that changes the pressure release chamber, reduce the pressure in the air network management as required to avoid the too much power that causes of pressure drop not enough, avoid pressure drop too little, and the problem of unable avoiding surging.

Drawings

FIG. 1 is a block diagram of the present invention;

fig. 2 is a schematic structural view of a pressure relief tank according to the present invention.

Description of reference numerals:

1-air compressor body, 2-air network pipe, 3-pressure relief tank, 4-first electromagnetic valve, 5-hydrogen-oxygen fuel cell, 6-exhaust pipe, 7-second electromagnetic valve, 8-pressure relief cavity, 9-piston, 10-regulation cavity, 11-third electromagnetic valve, 12-bidirectional pump, 13-spring and 14-flowmeter.

Detailed Description

The embodiments described below with reference to the drawings are illustrative only and should not be construed as limiting the invention.

In the process of operating the air compressor, the internal gas flow is extremely complicated, and in order to solve the surge problem, the inventor conducts a large number of tests and sufficiently analyzes and compares the test results. Finally, it is concluded that: one of the important reasons for surge is that when the air compressor is in operation, the pressure at the air outlet of the air compressor is less than the pressure at the mesh tube.

Based on the above findings, the invention designs the following solutions:

referring to fig. 1 and 2, the present invention provides a high-speed electric air compressor with vibration suppression function for a fuel cell vehicle, wherein the high-speed electric air compressor comprises an air compressor body 1, an air network pipe 2, a pressure relief tank 3, a first pressure sensor and a second pressure sensor;

the air compressor body 1 is a centrifugal air compressor. That is, this scheme mainly solves centrifugal air compressor's surge problem. The air network pipe 2 is connected with an air outlet of the air compressor body 1, and the air network pipe 2 is also used for being connected with a hydrogen-oxygen fuel cell 5. In the present application, the air network pipe refers to a pipeline part connecting the air compressor body 1 and the hydrogen-oxygen fuel cell 5.

The pressure relief tank 3 is communicated with the air net pipe 2; a first electromagnetic valve 4 is arranged between the pressure relief tank 3 and the air network pipe 2; the pressure relief tank 3 is installed at one end of the air network pipe 2 close to the outlet of the air compressor body 1. In specific implementation, the distance between the pressure relief tank 3 and the air net pipe 2 is 0.1-0.3 m.

The first pressure sensor is installed at the air outlet of the air compressor body 1 and used for detecting the pressure at the air outlet of the air compressor body 1 and recording the pressure as a first pressure; the second pressure sensor is installed in the air network pipe 2, and is used for detecting the pressure in the air network pipe 2, and the second pressure is recorded as the second pressure.

When the device is used, firstly, the target pressure of the air compressor body 1 corresponding to the hydrogen-oxygen fuel cell 5 under the current or predicted working condition at the next moment is obtained; specifically, the target pressure is obtained according to the current running state parameters of the vehicle and the received control instructions, such as the load of the vehicle electrical appliances, the throttle state, the vehicle speed state, the acceleration state and the like. The state parameters are converted into the requirements for power, the required high-pressure air is calculated according to the hydrogen-oxygen fuel cell, and finally the required high-pressure air is converted into the target pressure of the air compressor body 1.

When the second pressure is higher than the first pressure, the first solenoid valve 4 is opened, so that the second pressure is lower than the smaller value of the first pressure and the target pressure; and adjusting the rotating speed of the air compressor body 1 to enable the first pressure to approach the target pressure. And closes the first solenoid valve 4 after the first pressure is equal to the target pressure.

When the second pressure is greater than the first pressure, surging will occur, and in order to avoid the situation, the pressure of the air network pipe is rapidly reduced by communicating the pressure relief tank 3 with the air network pipe 2, so that gas is prevented from flowing backwards into the air compressor body 1, and the air compressor body 1 can be prevented from surging.

In order to control the pressure relief time, an exhaust pipe 6 is arranged on the pressure relief tank 3, and a second electromagnetic valve 7 is arranged on the exhaust pipe 6; the second electromagnetic valve 7 is used for being opened after the first electromagnetic valve 4 enters a closed state from an open state, and being closed after the pressure in the pressure relief tank 3 is equal to the external air pressure.

When the device is used, the pressure required to be regulated each time can be different, when the device is used, if the overpressure is reduced too much, the power generated by the hydrogen-oxygen fuel cell is reduced, the power of the automobile is insufficient, and if the overpressure is reduced too little, the surge cannot be completely avoided. In order to ensure the accurate control of the pressure regulating quantity, the application makes further improvement on the scheme: a pressure relief cavity 8 is arranged in the pressure relief tank 3, and the volume of the pressure relief cavity 8 is adjustable. Specifically, the volume of the pressure relief chamber 8 is adjusted to a target volume 0.5S before the first electromagnetic valve 4 is opened to be opened;

the calculation formula of the target volume is as follows:

wherein, V_TargetTo calculate the volume; p_NetIs the pressure in the air network tube 2, i.e. the second pressure; v_NetIs the volume of the air mesh tube 2; p_minIs the lesser of the first pressure and the target pressure.

When the first pressure is lower than the second pressure, the following two specific cases are further classified according to the difference between the first pressure and the target pressure:

when the first pressure is larger than the target pressure, the pressure in the air network pipe 2 is directly adjusted to the target pressure, and then the air compressor body is controlled to reduce the pressure to the target pressure. So that the pressure of the air outlet of the air compressor body 2 is stably transited to the target pressure;

when the first pressure is smaller than the target pressure, the pressure in the air network pipe 2 is directly adjusted to the first pressure, and then the air compressor body is controlled to submit the pressure to the target pressure, so that the pressure of the air outlet of the air compressor body 2 is stably transited to the target pressure. In this way, the phenomenon of surging occurring when the air compressor body 1 is subjected to the speed increasing and reducing control can be avoided.

As a better implementation manner, in order to further precisely control and precisely adjust the pressure in the air network pipe, a piston 9 is arranged in the pressure relief tank 3, and the piston 9 is connected with the inner wall of the pressure relief tank 3 in a sliding and sealing manner. The position of the pressure relief chamber 8 can be changed by controlling the position of the piston 9 in the pressure relief tank 3.

Further, referring to fig. 2, the piston 9 divides the pressure relief tank 3 into the pressure relief cavity 8 and the adjustment cavity 10; the exhaust pipe 6 and the mesh pipe are both connected with the pressure relief cavity 8; so, can be after accomplishing a pressure release, exhaust the pressure release chamber 8 in the pressure release jar 3 through blast pipe 6 to the pressure release is convenient for next time.

For controlling the adjustment chamber 10, the invention further comprises the following:

the adjusting cavity 10 is communicated with an external water source through a bidirectional pump 12; the external water source is water generated by the hydrogen-oxygen fuel cell 5 during operation; a third electromagnetic valve 11 is arranged on a pipeline connecting the adjusting cavity 10 and the bidirectional pump 12; when the volume of the pressure relief cavity 8 is adjusted, when the volume of the pressure relief cavity 8 needs to be reduced, water is supplied into the adjusting cavity 10 through the bidirectional pump 12 to push the piston 9 to move to one side close to the pressure relief cavity 8 so as to reduce the volume of the pressure relief cavity 8; when the volume of the pressure relief cavity 8 needs to be increased, the water in the adjusting cavity 10 is pumped out through the bidirectional pump 12, so that the piston 9 moves to the side close to the adjusting cavity 10 to reduce the volume of the pressure relief cavity 8; and closes the third solenoid valve 11 after the end of the regulation. That is, the present invention adjusts the position of the piston by pumping water into the adjustment chamber 10. Since liquid water is not easily compressed, the position of the piston can be conveniently and accurately controlled, and further the control of the pressure relief cavity 8 is ensured.

As a better mode, a spring 13 is further arranged in the adjusting cavity 10, one end of the spring 13 is connected with the piston 9, and the other end is connected with the inner wall of the pressure relief tank 3. In this way, the return of the piston 9 to the original position can be assisted by the spring 13.

In order to strictly ensure the volume of the pressure relief chamber 8, the amount of liquid entering or exiting the regulating chamber 10 is precisely controlled. To this end, the invention is further improved as follows:

a flow meter 14 is arranged on a pipeline connecting the adjusting cavity 10 and the bidirectional pump 12; calculating the adjusting volume of the adjusting cavity 10 according to the total volume of the pressure relief tank 3, the target volume of the pressure relief cavity 8 and the current volume of the adjusting cavity 10, and calculating the target inflow or the target outflow of water in the adjusting cavity 10 according to the adjusting volume; when the detection result of the flow meter 14 is equal to the target inflow amount or the target outflow amount, the bidirectional pump 12 is turned off, and the third electromagnetic valve 11 is turned off. Whether water flows in or flows out depends on whether the pressure relief cavity 10 is increased or decreased, therefore, after each exhaust is completed, the position of the piston is required to be obtained to calculate the volume of the pressure relief cavity as the current volume during the next pressure relief, so that the water in the adjusting cavity 10 is controlled to flow out when the target volume of the pressure relief cavity is larger than the current volume of the pressure relief cavity according to the comparison between the target volume of the pressure relief cavity and the target volume of the pressure relief cavity during the pressure relief; if the target volume of the pressure relief chamber is smaller than the current volume of the pressure relief chamber, water is controlled to flow into the regulating chamber 10. When the exhaust is completed, the pressure relief chamber 8 is communicated with the outside, and the gas in the pressure relief chamber 8 is equal to the ambient pressure.

Considering that the size of the adjusting cavity 10 is changed by controlling the water inlet mode, the liquid speed has certain requirements, and in order to ensure that the adjusting cavity 10 can be quickly adjusted, the invention also makes the following design: specifically, an initial position is arranged in the pressure relief tank 3; when the second solenoid valve 7 is opened, the third solenoid valve 11 is opened, and the bidirectional pump 12 pumps water so that the piston 9 is located at the initial position; the initial position is a position where the target position in the pressure relief tank 3 is the most frequently when the piston 9 is adjusted for the last N times; wherein N is an integer greater than 500.

Further, in the latest N times of adjustment, if the position where the target position appears most frequently is not less than two, the midpoint of the positions at the two ends is taken as the initial position. So, can guarantee to carry out accurate regulation fast to the position of piston. Compare in adjusting through mechanical parts, this kind of regulative mode can guarantee that the pressurized of piston is more even, guarantees the leakproofness at the during operation.

Through the scheme, the invention at least has the following beneficial effects:

1. according to the invention, by arranging the pressure relief tank, when the air compressor needs to be decelerated and depressurized, the air network pipe is depressurized through the pressure relief tank, so that the pressure in the air network pipe is lower than the smaller of the target pressure and the pressure at the air outlet of the air compressor body. Therefore, when the air compressor is decelerated, the pressure in the air compressor is always greater than the pressure in the air network pipe, and the surge phenomenon caused by gas backflow is avoided.

2. Through setting the pressure release jar to the structure that the pressure release chamber is adjustable, can calculate according to the calculated result as required, through the volume that changes the pressure release chamber, reduce the pressure in the air network management as required to avoid the too much power that causes of pressure drop not enough, avoid pressure drop too little, and the problem of unable avoiding surging.

The construction, features and functions of the present invention are described in detail in the embodiments illustrated in the drawings, which are only preferred embodiments of the present invention, but the present invention is not limited by the drawings, and all equivalent embodiments modified or changed according to the idea of the present invention should fall within the protection scope of the present invention without departing from the spirit of the present invention covered by the description and the drawings.