RU2713093C1 - Pulsed pressure generating device - Google Patents

Abstract

FIELD: instrument engineering.

SUBSTANCE: invention relates to instrument-making, in particular, to devices for graduation, verification and calibration of pressure sensors. Device for generating a pulsating pressure comprises a housing with a blind cylindrical bore, in which a cylindrical distributor is installed, with a gas supply and discharge channels, located in one plane coaxially to each other, and with a gas suction channel, the latter is located in one vertical plane with gas supply and gas discharge channels and displaced along the housing to the other horizontal plane at the distance sufficient to exclude communication of gas suction channel with gas supply channel. On the surface of the blind cylindrical bore from the gas discharge channel in the direction of the horizontal plane of the gas suction channel there is a longitudinal groove, in the cylindrical distributor there are two transverse through channels, first of which is made in one horizontal plane with gas supply and discharge channels and serves for rotation of distributor for intermittent connection of gas supply and discharge channels, second is in one horizontal plane with gas suction channel and serves for periodic connection of suction and gas removal channels through longitudinal recess. First and second through cross channels of the cylindrical distributor in the projection on the horizontal plane are orthogonal.

EFFECT: broader technical capabilities of existing pulsed pressure generating devices.

1 cl, 11 dwg

Description

The invention relates to instrumentation, in particular to devices for calibration, calibration and calibration of pressure sensors.

A device for generating a pulsating pressure is known from the patent literature, comprising a housing provided with a working chamber of pulsating pressure and gas discharge and supply channels, and a distributor having rotation and provided with a channel for alternately communicating the working chamber with gas supply and removal channels, the housing is made with a blind a cylindrical bore, in which a distributor made in the form of a cylindrical rod is placed, and the working chamber is formed by the inner surface of the cylindrical bore to housing and ends of the distributor and the bore of the body (SU No. 838478, G01L 27/00, 1981).

The disadvantages of this device are:

- in its inefficiency as a pulsator, due to the lack of the possibility of depressurization from the gas outlet channel, to which a calibrated and reference (reference) pressure transducer must be connected, before the subsequent pressure pulses (pulsations) are supplied to the channel;

- in a narrow dynamic range of pulsations due to the small volume of the working chamber of the pulsating pressure in comparison with the volume of the internal cavities of the gas outlet channel, calibrated and reference pressure sensors and fittings, providing the connection of these sensors to the gas outlet channel;

- the impossibility of creating pulsations with negative pressure (creating a vacuum).

A device for creating a pulsating pressure is known, which is the closest in technical essence to the claimed one, comprising a housing provided with a working pulsating pressure chamber and gas exhaust and supply channels, and a distributor made in the form of a cylindrical rod having rotation and provided with a channel for transverse communication a working chamber with a channel for supplying and discharging gas, the housing is additionally equipped with a channel for suctioning gas from the gas outlet channel, which ensures the creation of negative pressure in the gas exhaust channel and a recess in the distributor, which, when rotating, connects the gas exhaust channel from the gas exhaust channel and the gas exhaust channel RZ No. 21388, G01L 27/00, 2009).

This device also has several disadvantages, namely:

- a narrow dynamic range of pulsations due to the small volume of the working chamber of the pulsating pressure in comparison with the total volume of the internal cavities of the gas exhaust channel, calibrated and reference (reference) pressure sensors and fittings, providing the connection of these sensors to the gas exhaust channel;

- insufficient speed of rotation of the distributor in the housing of the device to create the required pulse repetition rate of high and negative pressure;

- the inability of the device to create a pulsating pressure, due to its design feature, which consists in the fact that the channels of supply, exhaust, gas suction and undercut are made in one horizontal plane.

The problem to which the invention is directed is to expand the technical capabilities of existing devices for creating pulsating pressure.

The technical result of the invention is a device that provides a wide dynamic range of pulsations of positive and (or) negative pressure in a gaseous medium, eliminating the dependence of the amplitude of the pulsation pulses on the volume of the pulsating pressure chamber, capable of creating the required pulse repetition rate of high and negative pressure at half distributor rotation speed.

The problem is solved in that in a device for creating a pulsating pressure, comprising a housing with a blind cylindrical bore, into which a cylindrical distributor with rotary inlet, with gas supply and exhaust channels located in the same plane aligned with each other, and with a gas suction channel, is installed located in the same vertical plane with the gas supply and gas exhaust channels, and is displaced along the body into another horizontal plane by a distance sufficient to exclude the channel communication gas pump with a gas supply channel, a longitudinal groove is formed on the surface of a blind cylindrical bore from the gas exhaust channel in the direction of the horizontal plane of the gas suction channel, two transverse through channels are made in the cylindrical distributor, the first of which is made in one horizontal plane with gas supply and exhaust channels and serves when rotating the distributor for periodic connection of gas supply and exhaust channels, the second - in the same horizontal plane with the gas suction channel and serves to cally compound suction channel and discharging gas through the longitudinal groove, wherein the first and second transverse channels through the cylindrical distributor in projection on a horizontal plane - orthogonal.

In FIG. 1 - FIG. 3 shows, respectively, longitudinal and transverse sections of the device; in FIG. 4 - FIG. 11 is a cross-sectional view of the device when the distributor is sequentially in different positions 0 °, 90 °, 270 ° and 360 ° (0 °) within one revolution when rotating clockwise in the device body.

A device for creating a pulsating pressure comprises a housing 1 made with a blind cylindrical bore 2 and gas supply channels 3, gas outlet 4 and gas suction 5, gas supply channels 3 and gas outlet 4 are made in one horizontal plane AA and in one vertical plane Bb.

A cylindrical distributor 6 is installed in the blind cylindrical bore 2 of the housing 1, which is capable of rotation in the blind cylindrical bore 2 of the housing 1 of the device.

The gas suction channel 5 in the device body 1 is made in one vertical BB plane with the gas supply 3 and gas outlet 4 channels, but offset along the device body 1 into another horizontal plane BB in a distance of 7 sufficient to exclude the communication of the suction channel 5 gas channel 3 gas supply.

In the cylindrical distributor 6 there are two transverse through channels 8 and 9.

The through transverse channel 8 is located in one horizontal plane AA with the gas supply channels 3 and gas outlet 4 and serves when rotating the cylindrical distributor 6 to periodically connect the gas supply channels 3 and gas outlet 4.

The second through transverse channel 9 of the cylindrical distributor 6 is made in another horizontal plane BB with a gas suction channel 5 of the device body 1, and serves when rotating the distributor 6 to periodically connect the gas suction channels 5 of the gas and the gas outlet 4 of the device body 1 through a longitudinal groove 10, made on the surface of a blind cylindrical bore 2 of the device body 1 from the gas exhaust channel 4 in the direction of the horizontal plane BB with the gas exhaust channel 5 and the second through transverse channel 9 of the cylindrical race redelitelya 6.

The length of the groove 10 is made sufficient for periodic communication, with the rotation of the distributor 6, with the second through transverse channel 9 of the cylindrical distributor 6.

The through transverse channels 8 and 9 of the cylindrical distributor 6 are orthogonal in the projection onto the horizontal plane.

A device for creating a pulsating pressure is as follows.

To generate high pressure pulses, a high pressure gas source is connected to the gas supply channel 3, a calibrated pressure sensor and a standard (reference) pressure sensor (not shown) are connected to the gas exhaust channel 4, the gas suction channel 5 remains free.

In the initial position of the distributor 0 ° (Figs. 2 and 3, Figs. 4 and 5), through the gas supply channel 3 and the through transverse channel 8, high-pressure gas is supplied to the gas exhaust channel 4, thereby creating a front of a high-pressure gas pulse.

When the cylindrical distributor 6 is rotated clockwise 90 ° (Figs. 6 and 7), the gas supply channel 3 is blocked by the surface of the cylindrical distributor 6, the through transverse channel 8 is blocked by the surface of the blind cylindrical bore 2, the gas removal channel 4 through the longitudinal groove 10 and the through transverse channel 9 communicates with the gas suction channel 5. Gas is discharged from the gas exhaust channel 4 to the gas suction channel 5, thereby creating a recession (slice) of the high-pressure gas pulse in channel 4.

When the cylindrical distributor 6 is rotated clockwise 180 ° (Figs. 8 and 9) through the gas supply channel 3 and the through transverse channel 8, high pressure gas is supplied to the gas removal channel 4.

Channel 4 creates the front of a high-pressure gas pulse.

When the cylindrical distributor 6 is rotated clockwise 270 ° (Figs. 10 and 11), the gas supply channel 3 is blocked by the cylindrical surface of the distributor 6, the longitudinal groove 10 is blocked by the surface of the blind cylindrical bore 2, the gas removal channel 4 through the longitudinal groove 10 and the through transverse channel 9 communicates with the gas suction channel 5. Gas from channel 4 enters channel 5, thereby creating a recession (slice) of the high-pressure gas pulse in channel 4.

When the valve 6 is rotated clockwise 360 °, the position of the cylindrical valve 6 corresponds to the initial position 0 ° (Figs. 4 and 5).

Thus, in one revolution of the cylindrical distributor 6, the device for creating a pulsating pressure generates two pulses of high gas pressure.

The amplitude of the high-pressure gas pulses is equal to the gas pressure supplied to the gas supply channel 3. The duration of the high-pressure gas pulses is equal to one fourth of the duration of one revolution of the cylindrical distributor 6. The repetition period of the high-pressure gas pulses is equal to half the duration of one revolution of the cylindrical distributor 6.

To form negative pressure pulses (below atmospheric), the gas supply channel 3 is left free, a calibrated pressure sensor and a standard (reference) pressure sensor (not shown in Fig. 4) are connected to the gas exhaust channel 4, and a gas suction device is connected to the gas suction channel 5.

At the positions of 90 ° (Fig. 6 and 7) and 270 ° (Fig. 10 and 11) of the cylindrical distributor 6 from the gas exhaust channel 4, the gas is sucked into the channel 5 through the longitudinal groove 10 and the through transverse channel 9, thereby forming a negative pulse front pressure.

At positions 0 ° (Figs. 4 and 5) and 180 ° (Figs. 8 and 9) of the cylindrical distributor 6 from the gas supply channel 3, atmospheric pressure gas enters the gas exhaust channel 4 through the transverse channel 9, a pulse decay (cut) is formed negative pressure.

Thus, in one revolution of the cylindrical distributor 6, the device for creating a pulsating pressure generates two pulses of negative gas pressure.

The amplitude of the pulses of the negative gas pressure is determined by the power of the gas suction device, which, during the communication of channels 4 and 5, must suck the gas from channel 4 to the desired negative pressure value. The duration of the pulses of negative gas pressure is equal to one fourth of the duration of one revolution of the cylindrical distributor 6. The repetition period of pulses of negative gas pressure is equal to half the duration of one revolution of the cylindrical distributor 6.

To form a sequence of pulses of positive (above atmospheric) and negative (below atmospheric) pressure, a high pressure source is connected to the gas supply channel 3, a calibrated pressure sensor and a standard (reference) pressure sensor (not shown) are connected to the gas exhaust channel 4, a gas suction device is connected to channel 5.

At the positions 0 ° (Fig. 4 and 5) and 180 ° (Fig. 8 and 9) of the cylindrical distributor 6 from the gas supply channel 3, a high-pressure gas enters the gas exhaust channel 4 through the transverse channel 9, a pulse decay (cut) is formed negative pressure and front pulses of high pressure.

At the positions of 90 ° (Fig. 6 and 7) and 270 ° (Fig. 10 and 11) of the cylindrical distributor 6 from the gas exhaust channel 4, gas is sucked into the channel 5 through the longitudinal groove 10 and the through transverse channel 9, thereby forming a drop (cut ) high pressure pulses and the front of negative pressure pulses.

The pulse duration of the positive and negative gas pressure is equal to one fourth of the duration of one revolution of the cylindrical distributor 6. The pulse repetition period of the positive and negative gas pressure is equal to half the duration of one revolution of the cylindrical distributor 6.

With uniform rotation of the cylindrical distributor 6, the device generates a periodic sequence of pressure pulses with a duty cycle equal to two.

Pulse duty is the ratio of the repetition period to the pulse duration, calculated by the formula

where S is the duty cycle of pulses;

T is the pulse repetition period;

τ _And is the pulse duration.

The proposed device for creating a pulsating pressure provides the creation of a wide dynamic range of pulsations of positive and (or) negative pressure in a gas medium, eliminates the dependence of the amplitude of the pulsation pulses on the volume of the pulsating pressure chamber, creates the required pulse repetition rate of high and negative pressure at half the speed rotation of the distributor.

Claims (1)

A device for generating a pulsating pressure, comprising a housing with a blind cylindrical bore, into which a cylindrical distributor with gas supply and exhaust channels located in the same plane aligned with each other, and with a gas suction channel, which is located in one a vertical plane with gas supply and gas removal channels and is displaced along the housing to another horizontal plane by a distance sufficient to exclude the communication of the gas suction channel with the channel ohm of gas supply, a longitudinal groove is formed on the surface of the blind cylindrical bore from the gas exhaust channel in the direction of the horizontal plane of the gas suction channel, two transverse through channels are made in the cylindrical distributor, the first of which is made in the same horizontal plane with the gas supply and exhaust channels and serves the rotation of the distributor for the periodic connection of the gas supply and exhaust channels, the second - in the same horizontal plane with the gas suction channel and serves for periodic connection the channels of suction and exhaust gas through a longitudinal groove, while the first and second through transverse channels of the cylindrical distributor in the projection onto the horizontal plane are orthogonal.

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