阅读说明：本技术 一种超高速风洞喉道用气动球阀及其加工方法 (Pneumatic ball valve for throat of ultrahigh-speed wind tunnel and machining method of pneumatic ball valve ) 是由 钟涌 廖振洋 李理 张扣立 常雨 李贤� 段金鑫 刘宇 徐先富 陈柳吉 于 2019-09-10 设计创作，主要内容包括：本发明公开了一种超高速风洞喉道用气动球阀及其加工方法。该气动球阀开启时,左端盖、球芯和右端盖的中心通孔是与喉道型面平滑过渡的轴对称型面通道,是喉道型面的一部分。该气动球阀的加工方法包括以下步骤a.根据超高速风洞喉道尺寸,加工一个实心的气动球阀Ⅰ；b.将实心的气动球阀Ⅰ处于打开状态并固定,得到实心的气动球阀Ⅱ；c.将实心的气动球阀Ⅱ安装在超高速风洞喉道上；d.与超高速风洞喉道进行整体加工得到具有轴对称型面通道的气动球阀。该气动球阀能快速截止喉道,防止驱动气体对传感器造成冲刷；能有效分离驱动气体和试验气体,利于驱动气体的重复使用。该气动球阀的加工方法具有整体性,加工精度高,与超高速风洞喉道型面一致性好。(The invention discloses a pneumatic ball valve for a throat of an ultrahigh-speed wind tunnel and a processing method thereof. When the pneumatic ball valve is opened, the central through holes of the left end cover, the ball core and the right end cover are axisymmetric profile channels which are in smooth transition with the profile of the throat and are part of the profile of the throat. The machining method of the pneumatic ball valve comprises the following steps that a, a solid pneumatic ball valve I is machined according to the size of a throat of an ultrahigh-speed wind tunnel; b. the solid pneumatic ball valve I is in an open state and is fixed to obtain a solid pneumatic ball valve II; c. mounting a solid pneumatic ball valve II on the throat of the ultra-high speed wind tunnel; d. and integrally processing the pneumatic ball valve and the throat of the ultrahigh speed wind tunnel to obtain the pneumatic ball valve with the axisymmetric profile channel. The pneumatic ball valve can quickly cut off the throat, and prevent the driving gas from scouring the sensor; the driving gas and the test gas can be effectively separated, and the driving gas can be reused. The processing method of the pneumatic ball valve has the advantages of integrity, high processing precision and good consistency with the molded surface of the throat of the ultra-high speed wind tunnel.)

1. A pneumatic ball valve for a throat of an ultrahigh-speed wind tunnel comprises a left end cover (1), a valve seat (2), a supporting plate (3), a valve body assembly (4), a packing sealing assembly (5), a valve rod (6), a ball core (7) and a right end cover (8);

left end cap (1): the left end cover of the pneumatic ball valve is internally provided with a central through hole I;

valve seat (2): a seal for the core (7);

support plate (3): for supporting the core (7);

valve body assembly (4): a body portion of a pneumatic ball valve;

packing seal assembly (5): a seal for sealing between the valve body and the valve stem;

valve stem (6): the ball core (7) is driven to rotate, so that the opening and closing functions are realized;

core (7): the inner part is provided with a central through hole II;

right end cap (8): the right end cover of the ball valve is internally provided with a central through hole III;

when the pneumatic ball valve is in an open state, a central through hole I of the left end cover (1), a central through hole II of the ball core (7) and a central through hole III of the right end cover (8) are communicated;

the method is characterized in that: in the open state of the pneumatic ball valve, the central through hole I of the left end cover (1), the central through hole II of the ball core (7) and the central through hole III of the right end cover (8) are communicated smoothly-transiting axisymmetric profile channels, and the axisymmetric profile channels and the throat profile of the ultra-high speed wind tunnel are in smooth transition and are part of the throat profile of the ultra-high speed wind tunnel.

2. An ultra-high speed wind tunnel throat pneumatic ball valve according to claim 1, wherein the closing time of the pneumatic ball valve is less than 100 ms.

3. The pneumatic ball valve for the ultra-high speed wind tunnel throat according to claim 1, wherein the machining precision of the axisymmetric profile passage is within the IT7 precision class, and the surface roughness is less than or equal to 0.8.

4. An ultra-high speed wind tunnel throat pneumatic ball valve according to claim 1, characterized in that the positioning accuracy of the opening of the ball core (7) is less than or equal to 5 μm.

5. A processing method of a pneumatic ball valve for a throat of an ultrahigh-speed wind tunnel is characterized by comprising the following steps of: the method comprises the following steps:

a. according to the size of the throat of the ultra-high speed wind tunnel, a solid pneumatic ball valve I is processed in a matched mode;

b. the solid pneumatic ball valve I is in an open state and is fixed in the open state, and a solid pneumatic ball valve II is obtained;

c. mounting a solid pneumatic ball valve II on the throat of the ultra-high speed wind tunnel;

d. and processing the throat of the ultra-high speed wind tunnel according to a preset profile to obtain the pneumatic ball valve with the axisymmetric profile channel.

Technical Field

The invention belongs to the technical field of ultrahigh speed wind tunnel tests, and particularly relates to a pneumatic ball valve for a throat of an ultrahigh speed wind tunnel and a processing method thereof.

Background

In the ultrahigh-speed wind tunnel test, after test gas passes through the throat, the pneumatic ball valve is adopted to quickly cut off the test gas on the channel, so that the test gas is prevented from scouring the test model and the sensor through the throat, the service life of the test sensor is prolonged, and the integrity of the model is kept. However, the conventional ultrahigh-speed wind tunnel adopts an integral throat design, and cannot prevent driving gas from scouring a test model and a sensor in a mode of quickly stopping on the throat, so that the development of a pneumatic ball valve special for the ultrahigh-speed wind tunnel throat is urgently needed.

Disclosure of Invention

The invention aims to solve a technical problem of providing a pneumatic ball valve for a throat of an ultrahigh-speed wind tunnel, and the invention aims to solve another technical problem of providing a processing method of the pneumatic ball valve for the throat of the ultrahigh-speed wind tunnel.

The pneumatic ball valve for the throat of the ultrahigh-speed wind tunnel comprises a left end cover, a valve seat, a supporting plate, a valve body assembly, a packing sealing assembly, a valve rod, a ball core and a right end cover;

a left end cover: the left end cover of the pneumatic ball valve is internally provided with a central through hole I;

valve seat: a seal for the core;

a support plate: for supporting the core;

a valve body assembly: a body portion of a pneumatic ball valve;

packing seal assembly: a seal for sealing between the valve body and the valve stem;

valve stem: the ball core is driven to rotate, so that the opening and closing functions are realized;

a ball core: the inner part is provided with a central through hole II;

a right end cover: the right end cover of the ball valve is internally provided with a central through hole III;

when the pneumatic ball valve is in an open state, the central through hole I of the left end cover, the central through hole II of the ball core and the central through hole III of the right end cover are communicated;

the method is characterized in that: in the open state of the pneumatic ball valve, the central through hole I of the left end cover, the central through hole II of the ball core and the central through hole III of the right end cover are communicated with an axisymmetric profile channel in smooth transition, and the axisymmetric profile channel and the throat profile of the ultra-high speed wind tunnel are in smooth transition and are part of the throat profile of the ultra-high speed wind tunnel.

The closing time of the pneumatic ball valve is less than 100 ms.

The processing precision of the axisymmetric molded surface channel is within the IT7 precision grade, and the surface roughness is less than or equal to 0.8.

The positioning precision of the ball core when being opened is less than or equal to 5 mu m.

The invention discloses a processing method of a pneumatic ball valve for a throat of an ultrahigh-speed wind tunnel, which comprises the following steps of:

a. according to the size of the throat of the ultra-high speed wind tunnel, a solid pneumatic ball valve I is processed in a matched mode;

b. the solid pneumatic ball valve I is in an open state and is fixed in the open state, and a solid pneumatic ball valve II is obtained;

c. mounting a solid pneumatic ball valve II on the throat of the ultra-high speed wind tunnel;

d. and processing the throat of the ultra-high speed wind tunnel according to a preset profile to obtain the pneumatic ball valve with the axisymmetric profile channel.

When the pneumatic ball valve for the throat of the ultra-high speed wind tunnel is produced, the rest parts except the left end cover, the ball core and the right end cover are not provided with holes, and are produced according to the normal production flow, after the ball valve is assembled, the ball valve is in an open state, then the left end cover, the ball core and the right end cover are processed at one time according to the required throat molded line, the open state of the ball valve needs to be locked in the processing process, and the ball core cannot rotate. After the processing is finished, the pneumatic ball valve is connected with the rest part of the throat to assemble a whole pair of throats, the fast ball valve of the throat of the wind tunnel is in an open state before testing, and is closed in a delayed mode after a test signal is obtained through a sensor during the wind tunnel test, so that the function of rapidly stopping the throat after test gas passes through the throat is achieved.

The pneumatic ball valve for the throat of the ultrahigh-speed wind tunnel can quickly cut off the throat, so that the sensor is prevented from being washed by driving gas; the driving gas and the test gas can be effectively separated, and the driving gas can be reused.

The processing method of the pneumatic ball valve for the throat of the ultra-high speed wind tunnel has the advantages of integrity, high processing precision and good consistency with the molded surface of the throat of the ultra-high speed wind tunnel.

Drawings

FIG. 1 is a schematic structural diagram of a pneumatic ball valve for a throat of an ultra-high speed wind tunnel according to the present invention.

In the figure, 1, a left end cover 2, a valve seat 3, a supporting plate 4, a valve body assembly 5, a packing seal assembly 6, a valve rod 7, a ball core 8 and a right end cover are arranged.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings and examples.