JP3358902B2 - Pulsating flow generator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pulsating flow generator for use in a simulation test of a device operating in a pulsating fluid such as a turbocharger operated by engine exhaust.

[0002]

2. Description of the Related Art As a pulsating flow generator used for a simulation test or the like of a device operating in a pulsating fluid, those shown in FIGS.

The pulsating flow generating device shown in the figure has a horizontal cylindrical fluid chamber 02 on both sides, is installed between the fluid chambers 02, and communicates with an opening 04 provided on the side of each fluid chamber 02. The housing comprises a T-shaped tube 01 having a turbine inlet 03 provided with openings 03 'on both sides, and a switching device 05 for opening and closing the opening 04 intermittently.

[0004] The inlet of the fluid chamber 02 communicates with a high-pressure fluid source such as a turbo compressor (not shown) via a pipe, and the outlet of the turbine inlet 03 similarly connects to a device to be tested via a pipe. It is connected to a fluid inlet (not shown) provided.

The opening / closing device 05 is inserted into a shaft 07 having both ends supported by a bearing 06 provided outside the fluid chamber 02, and is fixed by a nut 08. A rotary valve 09 that rotates on the periphery and opens and closes the opening 04, a pulley 0 that transmits a driving force of a variable speed motor (not shown) by a belt, and rotates the shaft 07 at an arbitrary rotation speed.
Consists of ten.

The rotary valve 09 is provided with several openings 09 a in accordance with the size of the opening 04. When the opening 09 a of the rotary valve 09 passes over the opening 04, the fluid chamber 02 and the turbine The inlet 03 is in an open state, and the fluid from the high pressure fluid source flows through the turbine inlet 03 to the fluid inlet of the device. When the closing portion 09b provided on the rotary valve 09 passes over the opening 01, the fluid chamber 02 and the turbine inlet 03 are closed, and the fluid from the high-pressure fluid source is shut off.

As described above, by the rotation of the rotary valve 09,
The pressure inside the turbine inlet 03 continuously repeats high and low states, and the fluid that reaches the fluid inlet provided in the device flows into the device as a pulsating flow.

As described above, in the conventional pulsating flow generator,
Due to the rotation of the rotary valve 09, the pressure inside the turbine inlet 03 becomes high or low, so that a pulsating flow can be generated. By changing the rotation speed of the variable speed motor and generating a pulsating flow of an arbitrary frequency, it is possible to perform a test by using the pulsating flow.
The opening and closing of the opening 04 by 9 greatly changes the resistance of the fluid path on the upstream side between the high-pressure fluid source and the turbine inlet 03, and generates a fluctuating pressure on the upstream side, thereby generating noise and vibration. is there.

For this purpose, a large capacity reservoir tank is required.
Installed between the high pressure fluid source and the turbine inlet 03, etc.
It is necessary to provide a device that absorbs the fluctuating pressure, and there is a problem that the pulsating flow generating device becomes large and its cost increases.

The above-described pulsating flow generator has a plurality of devices for performing a simulation test and the like, and when it is necessary to perform the tests at the same time, for example, when performing a turbine simulation test of a turbocharger having a twin scroll. In order to generate a pulsating flow individually for each device, there is a problem that a pulsating flow generating device is required for the number of devices to be tested.

[0011]

SUMMARY OF THE INVENTION According to the present invention, a fluctuating pressure absorbing device such as a reservoir tank is provided between a high-pressure fluid source and a turbine inlet in order to solve the above-mentioned disadvantages of the pulsating flow generating device. It is an object of the present invention to provide a pulsating flow generating device that does not generate a fluctuating pressure upstream of a turbine inlet without installing the pulsating flow generating device.

Another object of the present invention is to provide a turbocharger equipped with a twin scroll, etc.
When testing multiple installed devices at the same time,
It is an object of the present invention to provide a pulsating flow generator capable of performing a test by installing one unit for at least two devices.

[0013]

For this reason, the pulsating flow generator of the present invention has the following means. (1) A turbine inlet was provided for receiving fluid from a high pressure fluid source and supplying the received fluid to the equipment under test. (2) The bypass line is installed so as to be shut off from the turbine inlet, receives fluid from the high-pressure fluid source, and is connected to the outside or a bypass line having the same resistance as when the turbine inlet is connected to the high-pressure fluid source. And a bypass outlet for discharging the received fluid. (3) When the high-pressure fluid source is interposed between the high-pressure fluid source, the turbine inlet and the bypass outlet, and communicates with the turbine inlet, the high-pressure fluid source and the bypass outlet are shut off. When the fluid source communicates with the bypass outlet,
A rotary valve for alternately shutting off the high-pressure fluid source and the turbine inlet was provided.

Further, another pulsating flow generator according to the present invention employs the following means. (4) A first turbine inlet for supplying the received fluid was provided in one of a plurality of devices for receiving and testing the fluid from the high-pressure fluid source. (5) A second turbine, which is installed to be isolated from the first turbine inlet and receives the fluid from the high-pressure fluid source and supplies the received fluid to another one of the plurality of devices to be tested. An inlet was provided. (6) When the high-pressure fluid source is interposed between the high-pressure fluid source and the first and second turbine inlets and communicates with the first turbine inlet, the high-pressure fluid source and the second turbine flow A rotary valve that shuts off between the inlet and the high-pressure fluid source and communicates with the second turbine inlet to alternately shut off the high-pressure fluid source and the first turbine inlet; Was. It should be noted that the number of devices to which the fluid is supplied from the first and second turbine inlets is not limited to one, and a plurality of devices may be supplied by branching a pipeline for supplying the fluid to the devices. You can also.

[0015]

The pulsating flow generator according to the present invention has the above-mentioned (1) to (4).
(1) When the rotary valve opens the communication with the high-pressure fluid source with respect to the turbine inlet, the rotary valve closes with respect to the bypass outlet. Further, the turbine inlet, the bypass outlet, and the rotary valve are configured so that the rotary valve is closed with respect to the turbine inlet when the rotary valve is opened with respect to the bypass outlet. As a result, due to the continuous rotation of the rotary valve, the communication with the high-pressure fluid source continuously repeats the open / close state at the turbine inlet, and the fluid from the high-pressure fluid source becomes a pulsating flow to the device under test. Flowing down. Also, when the turbine inlet is closed, the bypass outlet is open, so that the resistance of the pipeline from the high-pressure fluid source is maintained substantially the same regardless of whether the turbine inlet is open or closed, Occurrence of vibration and noise due to pressure fluctuations that have conventionally occurred between the turbine inlet and the high-pressure fluid source can be completely prevented without installing a fluctuation pressure absorbing device.

Further, another pulsating flow generator of the present invention employs the above-mentioned means (4) to (6). (2) A fluid from a high pressure fluid source is supplied to one of a plurality of devices. The second turbine inlet, which supplies fluid to another of the plurality of devices when the rotary valve opens communication with the high pressure fluid source relative to the first turbine inlet. On the other hand, the rotary valve is closed, and conversely, when the rotary valve is opened with respect to the second turbine inlet, the rotary valve is closed with respect to the first turbine inlet. By configuring the first turbine inlet, the second turbine inlet and the rotary valve such that the first and second turbine inlets are continuously rotated by the rotary valve.
The communication with the high-pressure fluid source repeats the open / close state intermittently, and the fluid from the high-pressure fluid source flows to each of the devices to be tested as a pulsating flow out of phase. In addition, since one of the first and second turbine inlets is always open, the resistance of the pipeline from the high-pressure fluid source is substantially the same regardless of whether the first and second turbine inlets are opened or closed. Vibration caused by pressure fluctuations that have conventionally occurred between the turbine inlet and the high-pressure fluid source.
Generation of noise can be completely prevented without installing a variable pressure absorbing device.

Further, the test of at least two of the plurality of installed devices can be performed simultaneously with one pulsating flow generator. In addition, the number of high-pressure fluid sources such as turbo compressors that supply high-pressure fluid to the pulsating flow generator can be reduced, and most of the supplied high-pressure fluid is used for testing, is effectively used, and is wasted to atmospheric pressure, etc. Test cost can be reduced.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the pulsating flow generator according to the present invention will be described below with reference to the drawings. 1 to 3 are views showing a first embodiment of the present invention, in which FIG. 1 is a cross-sectional view, and FIG. 2 is a view taken along the line AA of FIG. 3 is a view taken along the line AA in FIG.
FIG.

In these figures, 1 is a housing, 2
Are fluid chambers formed on both sides of the housing 1 and formed in a horizontal cylindrical shape. The fluid chambers 2 each have a flanged inflow pipe 3 connected to a high-pressure fluid source (not shown) fixed thereto. Numeral 4 designates an opening 24 communicating with the opening 5 formed in the partition wall 6 forming the side surface of the fluid chamber 2 arranged on both sides on the side surface, and constitutes a central portion of the housing 1 formed between the fluid chambers 2. The turbine inlet, 7 is the turbine inlet 4
The bypass outlet is formed in the same manner as described above, similarly constitutes the central portion of the housing 1, and communicates with the opening 25 communicating with the opening 10 opened in the fluid chamber 2 partition wall 6.

The turbine inlet 4 is connected to an outlet pipe 8 having a flange for discharging a fluid to a device to be tested, and the bypass outlet 7 is connected to an external or turbine inlet. (4) A pressure adjusting valve or the like is provided to make the pipe resistance substantially the same as the downstream pipe resistance, and an outflow pipe 9 connected to a bypass line (not shown) provided for flowing out to a predetermined place is connected. Although the turbine inlet 4 and the bypass outlet 7 have been described as having openings 24 and 25 having the same sectional area as the openings 5 and 10,
Between the turbine inlet 4 and the bypass outlet 7,
A partition with an opening may be provided.

Next, 11 is a bearing installed on both sides of the fluid chamber 2, 12 is a shaft supported at both ends by the bearing 11, and is installed through the housing 1 and the fluid chamber 2, and 13 is a shaft 1
2, a rotary valve 14 having an opening 13a and a closing portion 13b formed in the periphery thereof, and sliding on the surface of the partition 6 to open and close the openings 5 and 10 provided in the partition 6. A nut 16 for fixing the rotary valve 13 to the shaft 12 is a pulley fixed to the end of the shaft 14 and rotating the shaft 14 by a driving force transmitted by a belt from a variable speed motor (not shown).

Since the pulsating flow generator of this embodiment is constructed as described above, the shaft 12 is driven by the driving force from the variable speed motor.
Is rotated, the rotary valve 12 fixed to the shaft 12
It turns while sliding on the partition 6 surface.

When the rotary valve 13 rotates to the state shown in FIG. 2, the fluid chamber 2 and the turbine inlet 4 are open, in other words, the high-pressure fluid source and the turbine inlet 4 communicate with each other. The fluid pressure in the turbine inlet 4 increases. In addition, the fluid chamber 2 and the bypass outlet 3 are closed, that is, the high-pressure fluid source and the bypass outlet 3 are shut off.

When the rotary valve 13 further rotates to the state shown in FIG. 3, the fluid chamber 2 and the bypass outlet 3 are opened, the fluid chamber 2 and the turbine inlet 4 are closed, and the high pressure The fluid from the fluid source is released to the bypass line via the bypass outlet 7, and the fluid pressure inside the turbine inlet 4 decreases.

This opening / closing state corresponds to an opening 13 formed around the rotary valve 13 during one rotation of the rotary valve 13.
a, the number of closing portions 13b repeatedly occurs, and the pulsating flow of a frequency determined by the number of rotations of the rotary valve 13 and the number of the openings 13a and the closing portions 13a is determined in the turbine inlet 4 by the rotation control of the variable speed motor. Occurs and can be subjected to a test. On the other hand, when the turbine inlet 4 is closed, the fluid from the high-pressure fluid source passes through the bypass outlet 7 and escapes to the bypass line.
In the meantime, the pressure fluctuation which has conventionally occurred is eliminated, and the generation of noise and vibration accompanying the fluctuation is prevented without providing a reservoir tank. The cross-sectional shape of the openings 5 and 10, the installation location, and the opening 13 a of the rotary valve 13
By changing the shape or the like of the (closing portion 13b), the shape of the pulsating flow at one frequency can also be changed.

FIGS. 4 to 6 show a second embodiment of the present invention. FIG. 4 is a cross-sectional view, and FIG. 5 is a view of FIG. Arrow BB diagram,
FIG. 6 is an arrow CC diagram of FIG. 4 in a state where the first turbine inlet is in an open state.

In these figures, reference numeral 31 denotes a housing in which a first turbine inlet 32 and a second turbine inlet 33 which are isolated from each other are defined, and 35 denotes a housing provided on both sides and a lower portion of the housing 31. Fluid chamber. Unlike the first embodiment, the left and right inflow chambers 35 communicate with each other at the lower part. The partition wall 36 of the inflow chamber 35 provided in contact with the side surface of the housing 31 has openings 37 and 38 formed on the side surfaces of the first turbine inlet 32 and the second turbine inlet 33, respectively. Openings 39 and 40 communicating with each other are provided. Further, the first turbine inlet 32 and the second turbine inlet 33 are respectively connected to outlet pipes 41 and 42 for discharging a fluid to a device to be tested.

As shown in FIGS. 5 and 6, an opening 13a and a closing portion 13b are formed in the periphery of the shaft 12 supported by the bearing 11, as in the first embodiment. 36
The openings 39 and 40 formed in the partition 36 are slid on the surface.
The rotary valve 13 that opens and closes is fixed by a fixing nut 14.

In this embodiment, as described above, when the shaft 12 rotates through the pulley 16 by the driving force from the variable speed motor, the rotary valve 13 slides on the surface of the partition wall 36. Rotate while rotating. When the rotary valve 13 rotates to the state shown in FIG. 5, the fluid chamber 35 and the first turbine inlet 32 are opened, and the high-pressure fluid source communicates with the first turbine inlet 32, The inside of the first turbine inlet 32 is in a high pressure state, and supplies fluid to connected equipment. At this time, as shown in FIG. 6, the fluid chamber 35 and the second turbine inlet 33 are connected to the opening 40 of the rotary valve 1.
3 and is closed by the closing portion 13b, so that the equipment connected to the second turbine inlet 33 is not supplied with fluid from the high-pressure fluid source.

When the rotary valve 13 further rotates, the fluid chamber 35 and the second turbine inlet 33 are opened, and the fluid chamber 35 and the first turbine inlet 32 are closed,
Fluid from the high pressure fluid source is supplied only to equipment connected to the second turbine inlet 33. This opening / closing state repeatedly occurs during one rotation of the rotary valve 13 by the number of openings 13 a and closing portions 13 b formed around the rotary valve 13, and the first and second turbine inlets 32, 33.
Has a rotary valve 13 determined by the rotation control of the variable speed motor.
A pulsating flow having a frequency determined by the number of rotations and the number of the opening portions 13a and the closing portions 13a is generated and used for the test. The pulsating flow can be supplied to at least two devices connected to the first and second turbine inlets 32 and 33, respectively.

In FIG. 4, the fluid chambers 35 provided on both sides of the housing 31 are individually connected to a high-pressure fluid source. However, in this embodiment, both fluid chambers 35 And one of the fluid chambers 35
Only the high pressure fluid source may be connected. Thereby, the number of high-pressure fluid sources and piping can be further reduced.

As shown in FIGS. 5 and 6, the rotary valve 13 opens and closes the fluid chamber 35 and the first and second turbine inlets 32 and 33, and has the same shape. In addition, a pulsating flow having the same frequency with a phase delay is supplied to the equipment connected to the second turbine inlets 32 and 33, but this is not always necessary. The number or shape of the openings 13a and the closing portions 13b of the rotary valve 13 that opens and closes the turbine inlet 32, and the number of the openings 13a and the closing portions 13b of the rotary valve 13 that opens and closes the second turbine inlet 33 Alternatively, the pulsating flow of a different frequency or waveform may be supplied to equipment connected to the respective turbine inlets in a different shape.

Although common to the first embodiment, the outlet pipes 41, 42 of the first and second turbine inlets 32, 33 are not necessarily connected to one of the devices to be tested. It is not a must. That is, by branching the pipes connected to the fluid pipes 41 and 42, a pulsating flow can be supplied to each of a plurality of devices.

[0034]

As described above, the pulsating flow generator according to the present invention can easily generate a pulsating flow by means of the structure according to the first aspect, and at the same time the pressure which has conventionally been generated upstream of the turbine inlet. The occurrence of fluctuation can be prevented without installing a reservoir tank, and the generation of noise and vibration accompanying the generation of fluctuation pressure can be prevented. In addition, variable speed motor rotation control,
By setting the number of openings provided in the rotary valve, a pulsating flow of a wide range of frequencies can be generated, and the waveform of the pulsating flow can be changed.

Further, according to the pulsating flow generator of the present invention, the pulsating flow generating device according to the second aspect of the present invention comprises:
Testing of at least two instruments can be performed simultaneously.
This not only reduces the number of pulsating flow generators, but also reduces the number of high-pressure fluid sources that supply high-pressure fluid to the pulsating flow generators. Therefore, the test cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a first embodiment of a pulsating flow generator according to the present invention.

FIG. 2 is an AA view of FIG. 1 in a state where a turbine inlet is in an open state.

FIG. 3 is an AA view of FIG. 1 in a state where a turbine inlet is closed.

FIG. 4 is a cross-sectional view showing a second embodiment of the present invention.

FIG. 5 shows a state in which the first turbine inlet is in an open state;
BB view of FIG.

FIG. 6 shows a state in which the second turbine inlet is in a closed state;
CC view of FIG.

FIG. 7 is a cross-sectional view of a conventional pulsating flow generator.

8 is a view taken along the line DD in FIG. 7;

[Explanation of symbols]

 Reference Signs List 1, 31 Housing 235 Fluid chamber 3 Inflow pipe 4 Turbine inlet 5 Opening of fluid chamber to turbine inlet 6, 36 Partition wall 7 Bypass outlet 8 Outflow pipe 9 Discharge pipe 10 Opening of fluid chamber to bypass outlet 11 Bearing 12 Shaft 13 Rotary valve 14 Nut 16 Pulley 24 Opening of turbine inlet 25 Opening of turbine outlet 32 First turbine inlet 33 Second turbine inlet 37 Opening of first turbine inlet 38 Second turbine Inlet opening 39 Fluid chamber opening to first turbine inlet 40 Fluid chamber opening to second turbine inlet 41 Outlet pipe at first turbine inlet 42 Outflow pipe at second turbine inlet

Continuation of the front page (56) References JP-A-61-228328 (JP, A) JP-A-59-7244 (JP, A) Actually open JP-A-52-57194 (JP, U) (58) Fields investigated (Int) .Cl. ⁷ , DB name) G01M 19/00 G01M 15/00 F04B 51/00 F15B 21/12

Claims (2)

(57) [Claims] 1. A pulsating flow generator used for testing a device performed with a pulsating fluid, wherein the pulsating flow generator is provided so as to be shut off from a turbine inlet for supplying a fluid from a high pressure fluid source to the device and the turbine inlet. A bypass outlet for discharging fluid from the high-pressure fluid source, and a bypass outlet interposed between the high-pressure fluid source, the turbine inlet and the bypass outlet, and alternately having the turbine inlet and the bypass outlet. A pulsating flow generating device comprising a rotary valve communicating with the high-pressure fluid source. 2. A pulsating flow generator for testing a plurality of devices provided with a pulsating fluid, comprising: a first turbine inlet for supplying a fluid from a high pressure fluid source to one of the devices; A second turbine inlet disposed in isolation from the first turbine inlet to supply fluid from the high pressure fluid source to another one of the devices; A rotary valve is interposed between the turbine inlet and the second turbine inlet, and the rotary valve alternately communicates the first turbine inlet and the second turbine inlet with the high-pressure fluid source. Pulsating flow generator.