Plunger type single-source pulse generator

Abstract

The invention provides a plunger type single-source pulse generator, which comprises a generator main body, a plunger type single-source pulse generator, a plunger type single-source pulse generator, a plunger type single-source pulse generator and a pulse generator, the valve shaft penetrates through the cavity body, and the end part of the valve shaft is connected with an external driving source so as to drive the valve shaft to rotate; the valve plug is composed of a plurality of sub-plug bodies distributed in the direction of the valve shaft, the sub-plug bodies are arranged corresponding to the air outlets, and each sub-plug body is provided with a ventilation-air blocking area; and the valve shaft is operated to act to drive the sub-plug body to rotate in the cavity so as to form a plurality of pulse airflows with specific amplitude-frequency characteristics on the air outlet side. The air inlet and the air outlets are formed in the generator body, the sub-plug bodies are arranged in the cavity in a matched mode, each sub-plug body is provided with the independent ventilation area and the independent air blocking area, the output pressure of each sub-air outlet is controlled to have the pulse airflow with the specific amplitude-frequency characteristic, and rack simulation under the complex boundary condition is achieved.

Description

Technical Field

[0001] The present application belongs to the technical field of equipment manufacturing, and in particular relates to a plunger-type single-source pulse generator. Background Art

[0002] In the field of diesel engine supercharger performance bench testing or other equipment aerodynamic performance testing, bench simulation of complex boundary conditions such as multi-spectrum composite intake pressure caused by special unsteady processes such as uneven exhaust of each cylinder of the engine and single-cylinder flameout has always been a major problem that limits the accuracy of test results and increases test time and economic costs.

[0003] Generally speaking, such tests in the past have required the installation of a real engine and the operation of the engine under relevant working conditions. As a result, the test cycle and cost are often relatively high and it is difficult to support long-term and frequent sufficient testing. Summary of the invention

[0004] In view of this, the present application aims to propose a plunger-type single-source pulse generator to solve the problem that the test cycle and cost are often relatively high and it is difficult to support long-term and multi-frequency sufficient testing.

[0005] To achieve the above purpose, the technical solution of this application is implemented as follows:

[0006] The present application provides a plunger-type single-source pulse generator, comprising:

[0007] A generator body, wherein a cavity is arranged inside the generator body, and an air inlet and a plurality of air outlets are provided on the generator body, the air inlet and the air outlets being connected to the cavity;

[0008] A valve shaft, the valve shaft is arranged to penetrate the cavity body, and an end portion is connected to an external driving source to drive the valve shaft to rotate;

[0009] A valve plug, the valve plug is composed of a plurality of sub-plug bodies distributed along the valve axis, the sub-plug bodies are arranged corresponding to the gas outlets, and each of the sub-plug bodies is provided with a ventilation-air blocking area;

[0010] The valve shaft is manipulated to move, driving the plug body to rotate in the cavity, so as to form a plurality of pulse airflows with specific amplitude and frequency characteristics on the outlet gas side.

[0011] Furthermore, a first extension portion is provided on the side wall of the generator body, and the first extension portion is connected to the air inlet to form an air inlet channel, and the air inlet channel is used to connect to an air inlet source;

[0012] Each gas outlet is distributed along the axial direction and arranged on the generator body. A plurality of second extension parts are also arranged on the side wall of the generator body. The second extension parts are arranged to penetrate the gas outlet to form a gas outlet channel, and the gas outlet channel is used to connect with the sample to be tested.

[0013] Furthermore, the generator body, the first extension portion and the plurality of second extension portions are integrally formed.

[0014] Furthermore, the plug body is provided with a plurality of notches, the plurality of notches are arranged around the valve shaft, and the plurality of notches cooperate to form a ventilation area; or;

[0015] The plug body is provided with a plurality of slots which can penetrate the plug body, the plurality of slots are arranged around the valve shaft, and the plurality of slots cooperate to form a ventilation area.

[0016] Furthermore, the valve shaft and the generator body are sealed by a sealing structure.

[0017] Furthermore, the driving source is a driving motor, and an output shaft of the driving motor is connected to the valve shaft.

[0018] Compared with the prior art, the plunger-type single-source pulse generator described in this application has the following beneficial effects:

[0019] The plunger-type single-source pulse generator described in the present application is a generator that opens an air inlet and multiple air outlets on a main body of the generator, and cooperates with multiple sub-plug bodies that are rotatably arranged in a cavity, each sub-plug body being provided with an independent ventilation area and air blocking area, thereby controlling the output pressure of each sub-outlet to produce a pulse airflow with specific amplitude-frequency characteristics, thereby realizing bench simulation of complex boundary conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0021] Figure 1 This is an internal cross-sectional view of a plunger-type single-source pulse generator according to an embodiment of the present application;

[0022] Figure 2 This is a schematic diagram of some detailed structures of a plunger-type single-source pulse generator described in an embodiment of the present application.

[0023] Description of reference numerals:

[0024] 1-generator body; 11-first extension portion; 12-second extension portion; 13-air inlet; 14-air outlet; 2-valve shaft; 3-plug body; 31-notch; 32-slot. DETAILED DESCRIPTION

[0025] In order to make the objectives, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0026] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should be the usual meanings understood by people with ordinary skills in the field to which the present application belongs. The "first", "second" and similar words used in the embodiments of the present application do not represent any order, quantity or importance, but are only used to distinguish different components. "Including" or "comprising" and similar words mean that the elements or objects appearing in front of the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0027] See also Figure 1 and Figure 2 As shown, this embodiment provides a plunger-type single-source pulse generator, comprising:

[0028] A generator body 1, wherein a cavity is provided inside the generator body 1, and an air inlet 13 and a plurality of air outlets 14 are provided on the generator body 1 and communicate with the cavity;

[0029] A valve shaft 2, which passes through the cavity and has an end connected to an external driving source to drive the valve shaft 2 to rotate;

[0030] The valve plug is composed of a plurality of sub-plug bodies 3 distributed along the valve axis 2. The sub-plug bodies 3 are arranged corresponding to the gas outlets 14. Each sub-plug body 3 is provided with a ventilation-blocking area.

[0031] The valve shaft 2 is controlled to move, driving the plug body 3 to rotate in the cavity, so as to form multiple pulse airflows with specific amplitude and frequency characteristics on the outlet gas side.

[0032] Specifically, in this embodiment, an air inlet 13 and a plurality of air outlets 14 are arranged on the generator body 1, and a rotating valve shaft 2 is arranged in the cavity of the generator body 1. A pulse generator valve plug having a plurality of plug bodies 3 is assembled and installed on the valve shaft 2. The relative position of each plug body 3 and the corresponding air outlet 14 is driven to change periodically by rotating the valve plug rotating shaft (valve shaft 2), thereby causing the corresponding periodic change of each outlet air pressure.

[0033] The plunger-type single-source pulse generator described in the present application is configured by opening an air inlet 13 and multiple air outlets 14 on the generator body 1, and cooperating with multiple sub-plug bodies 3 rotatably arranged in the cavity, each sub-plug body 3 is provided with an independent ventilation area and air blocking area, so as to control the output pressure of each sub-air outlet 14 to produce a pulse airflow with specific amplitude-frequency characteristics.

[0034] It should be noted that the purpose of setting up multiple air outlets 14 in the present application is: with the help of the structural design of the valve plug body, the air source flow input from the air inlet 13 is converted into multiple pulse airflows with different pressure wave amplitudes and frequencies, which are output to the outside of the pulse generator through different air outlets 14, and then synthesized in the subsequent structure to have the target airflow with the frequency characteristics of the complex boundary conditions to be simulated (the pulse airflows output by multiple air outlets 14 are synthesized into one at the far end and output to the sample to be tested), so as to realize the bench simulation of complex boundary conditions.

[0035] In some embodiments, a first extension portion 11 is provided on the side wall of the generator body 1, and the first extension portion 11 is connected to the air inlet 13 to form an air inlet channel, and the air inlet channel is used to connect to the air inlet source;

[0036] Each air outlet 14 is distributed along the axial direction and arranged on the generator body 1. A plurality of second extension portions 12 are also arranged on the side wall of the generator body 1. The generator body 1, the first extension portion 11 and the plurality of second extension portions 12 are integrally formed. The second extension portion 12 is connected with the air outlet 14 to form an air outlet channel, which is used to connect with the sample to be tested.

[0037] Specifically, in this embodiment, the generator body 1 is configured as a columnar structure, and sealing surfaces are provided on both sides of the end of the valve shaft 2 to form an internally closed cavity, and a first extension portion 11 is provided on one side of the cavity, and the first extension portion 11 is connected to an air inlet 13 provided in the cavity to form an air inlet channel, and a plurality of second extension portions 12 are provided on the other side of the cavity, and the first extension portion 11 is connected to an air outlet 14 provided in the cavity to form a plurality of air outlet channels.

[0038] It should be noted that if Figure 1As shown, the air inlet channel and the air outlet channel set in this embodiment are arranged correspondingly, that is, they are arranged on the same horizontal line. In addition to this embodiment, an angle can also be set between the air outlet channel and the air inlet channel to meet the actual simulation working conditions. This application does not make any specific limitation on the setting positions of the air inlet channel and the air outlet channel.

[0039] In some embodiments, a plurality of notches are formed on the plug body 3, the plurality of notches are arranged around the valve shaft 2, and the plurality of notches cooperate to form a ventilation area; or;

[0040] The plug body 3 is provided with a plurality of slots 32 which can penetrate the plug body 3 . The plurality of slots 32 are arranged around the valve shaft 2 . The plurality of slots 32 cooperate to form a ventilation area.

[0041] Specifically, in this embodiment, there is no specific limitation on the specific setting positions, numbers, shapes, thicknesses, and diameters of the notches and slots 32 of the multiple plug bodies 3. A valve plug can be used that has a plug body 3 with multiple notches, a valve plug can be used that has a plug body 3 with multiple through slots 32, or a valve plug can be used that has a plug body 3 with both notches and slots 31.

[0042] In this embodiment, the shape of the notch and the shape of the notch 32 can be set according to the design requirements of the waveform. For example, when the notch is set to an arc structure, the waveform generated on the side of the air outlet 14 is a sine wave; when the notch 31 is set to a penetrating arc structure, the waveform generated on the side of the air outlet 14 is a rectangular wave. For other forms, no further description is given here, and they can be flexibly set according to design requirements.

[0043] In addition, in this embodiment, when the minimum pressure value of the air outlet is required to be zero, the thickness of the plug body 3 needs to be greater than or equal to the diameter of the air outlet 14 .

[0044] In some embodiments, the valve shaft 2 and the generator body 1 are sealed by a sealing structure.

[0045] Specifically, in this embodiment, the present application adopts a labyrinth-type sealing structure, and matching sealing teeth are arranged on the sealing surface of the cavity and the valve plug. Through the shape and arrangement of the sealing tooth structure, the gas is forced to change direction when passing through the gap, thereby increasing the flow resistance. The gas in the cavity needs to pass through the narrow gap multiple times, and each throttling further reduces the gas flow rate, thereby reducing leakage. In addition, due to the multiple throttling effects of the labyrinth-type structure on the airflow, the noise generated by the gas flow can be reduced, thereby reducing the noise level generated by the simulation experiment.

[0046] In addition to the labyrinth seal structure, a sealing form such as a graphite ring may also be used to ensure that the connection between the valve shaft 2 and the generator body 1 is sealed.

[0047] In some embodiments, the driving source is a driving motor, and the output shaft of the driving motor is connected to the valve shaft 2 .

[0048] Specifically, in this embodiment, as to the connection method between the output shaft of the driving motor and the valve shaft 2, this embodiment adopts a direct connection method. In addition, a coupling, gear transmission and other structures can also be used to start the driving motor to drive the valve shaft 2 to rotate. No further details will be given here.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

[0050] The embodiments of the present application are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present application should be included in the scope of protection of the present application.

Claims

1. A plunger-type single-source pulse generator, characterized in that: include: A generator body, wherein a cavity is arranged inside the generator body, and an air inlet and a plurality of air outlets are provided on the generator body, the air inlet and the air outlets being connected to the cavity; A valve shaft, the valve shaft is arranged to penetrate the cavity body, and an end portion is connected to an external driving source to drive the valve shaft to rotate; A valve plug, the valve plug is composed of a plurality of sub-plug bodies distributed along the valve axis, the sub-plug bodies are arranged corresponding to the gas outlets, and each of the sub-plug bodies is provided with a ventilation-air blocking area; The valve shaft is manipulated to move, driving the plug body to rotate in the cavity, so as to form a plurality of pulse airflows with specific amplitude and frequency characteristics on the outlet gas side.

2. A plunger-type single-source pulse generator according to claim 1, characterized in that: A first extension portion is provided on the side wall of the generator body, and the first extension portion is connected to the air inlet to form an air inlet channel, and the air inlet channel is used to connect to an air inlet source; Each gas outlet is distributed along the axial direction and arranged on the generator body. A plurality of second extension parts are also arranged on the side wall of the generator body. The second extension parts are arranged to penetrate the gas outlet to form a gas outlet channel, and the gas outlet channel is used to connect with the sample to be tested.

3. A plunger-type single-source pulse generator according to claim 2, characterized in that: The generator body, the first extension portion and the plurality of second extension portions are integrally formed.

4. A plunger-type single-source pulse generator according to claim 1, characterized in that: in, The plug body is provided with a plurality of notches, the plurality of notches are arranged around the valve shaft, and the plurality of notches cooperate to form a ventilation area; or; The plug body is provided with a plurality of slots which can penetrate the plug body, the plurality of slots are arranged around the valve shaft, and the plurality of slots cooperate to form a ventilation area.

5. A plunger-type single-source pulse generator according to claim 1, characterized in that: The valve shaft and the generator body are sealed by a sealing structure.

6. A plunger-type single-source pulse generator according to claim 1, characterized in that: The driving source is a driving motor, and an output shaft of the driving motor is connected to the valve shaft.

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