CN214403797U - Fluid bypass system - Google Patents

Abstract

The utility model relates to a power machinery technical field discloses a fluid bypass system, including main line, bypass pipeline, scalable universal driving shaft, first flow sensor and control assembly. The main line includes import and export, be equipped with first butterfly valve in the main line, bypass pipeline communicates in the main line, be equipped with the second butterfly valve in the bypass pipeline, the both ends of scalable universal driving shaft are connected respectively in first butterfly valve and second butterfly valve to make first butterfly valve can keep the linkage with the second butterfly valve, first flow sensor is used for detecting the fluid flow in the bypass pipeline, the control assembly electricity is connected in second butterfly valve and first flow sensor, and can control the flexible of scalable universal driving shaft. The opening and closing degree of the second butterfly valve and the telescopic length of the telescopic linkage shaft jointly influence the opening and closing degree of the first butterfly valve, so that the distribution of fluid flow in a main pipeline and a bypass pipeline in the fluid bypass system can be realized.

Description

Fluid bypass system

Technical Field

The utility model relates to a power machinery technical field especially relates to a fluid bypass system.

Background

The exhaust gas recirculation technology has been widely used because it can greatly reduce the emission of nitrogen oxides, and particularly, may be installed in an exhaust gas emission system of an internal combustion engine to reintroduce a part of exhaust gas discharged after combustion into an intake side and then participate in a next operation cycle to reduce the emission of nitrogen oxides of the internal combustion engine. This is because the oxygen content in the exhaust gas generated by combustion in the internal combustion engine is extremely low or none, so that the oxygen concentration in the intake gas is lowered after the exhaust gas is mixed with the intake gas, and the oxygen content lower than the atmospheric air lowers the temperature at the time of combustion, thereby suppressing the generation of nitrogen oxides.

However, the requirement for the flow rate of the exhaust gas introduced into the intake side of the internal combustion engine also varies under different operating conditions, i.e. an optimum mixture ratio of exhaust gas to intake gas is to be ensured in order to achieve a maximum reduction in the production of nitrogen oxides without affecting the power of the internal combustion engine.

Therefore, a need exists for a fluid bypass system that achieves precise control of the flow of exhaust gas directed to the suction side.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a fluid bypass system to the realization is to leading-in accurate control to the waste gas flow of breathing in the side.

As the conception, the utility model adopts the technical proposal that:

a fluid bypass system, comprising:

the main pipeline comprises an inlet and an outlet, and a first butterfly valve is arranged in the main pipeline;

the bypass pipeline is communicated with the main pipeline, and a second butterfly valve is arranged in the bypass pipeline;

the two ends of the telescopic linkage shaft are respectively connected to the first butterfly valve and the second butterfly valve, and the telescopic linkage shaft is configured to enable the first butterfly valve and the second butterfly valve to keep linkage;

a first flow sensor for detecting a flow of fluid in the bypass line;

and the control component is electrically connected with the second butterfly valve and the first flow sensor and can control the extension and retraction of the telescopic universal driving shaft.

Further, the fluid bypass system further comprises a second flow sensor configured to detect a fluid flow at the outlet end of the main conduit, the second flow sensor being electrically connected to the control assembly.

Further, the fluid bypass system further includes a back pressure sensor configured to detect a back pressure at an inlet end of the main conduit, the back pressure sensor being electrically connected to the control assembly.

Further, the fluid bypass system also includes a differential pressure sensor configured to detect a pressure difference upstream of the first butterfly valve and downstream of the first butterfly valve, the differential pressure sensor being electrically connected to the control assembly.

Further, the fluid bypass system further comprises a measuring pipeline, the differential pressure sensor is arranged on the measuring pipeline, two ends of the measuring pipeline are both communicated with the main pipeline, one end of the measuring pipeline is located at the upstream of the first butterfly valve, and the other end of the measuring pipeline is located at the downstream of the first butterfly valve.

Further, the first butterfly valve includes a first butterfly plate configured to be able to open or completely close the main pipeline.

Further, the main pipeline and the bypass pipeline form a pipeline intersection, and the first butterfly valve comprises a first butterfly plate which is located at the pipeline intersection so that the main pipeline is always kept open.

Further, the second butterfly valve includes a second butterfly plate configured to be able to open or close the bypass line.

Furthermore, scalable universal driving shaft includes first universal driving shaft and the cover is located second universal driving shaft on the first universal driving shaft, just its axial displacement can be followed to the second universal driving shaft, first universal driving shaft connect in first butterfly valve, the second universal driving shaft connect in the second butterfly valve.

Further, the main pipeline and the bypass pipeline are arranged vertically; or

The main pipeline and the bypass pipeline are not vertically arranged.

The utility model has the advantages that:

the utility model provides a fluid bypass system, including main line, bypass pipeline, scalable universal driving shaft, first flow sensor and control assembly. Wherein the main line includes import and export, is equipped with first butterfly valve in the main line, bypass pipeline communicates in the main line, is equipped with the second butterfly valve in the bypass pipeline, and the both ends of scalable universal driving shaft are connected respectively in first butterfly valve and second butterfly valve to make first butterfly valve can keep the linkage with the second butterfly valve, first flow sensor is used for detecting the fluid flow in the bypass pipeline, and the control assembly electricity is connected in second butterfly valve and first flow sensor, and can control the flexible of scalable universal driving shaft. Specifically, the opening and closing degree of the second butterfly valve and the telescopic length of the telescopic linkage shaft jointly influence the opening and closing degree of the first butterfly valve, so that the different opening and closing degrees of the first butterfly valve and the second butterfly valve under different working conditions can be realized, the distribution of fluid flow in a main pipeline and a bypass pipeline in a fluid bypass system is realized, and when the fluid is applied to an exhaust system of an internal combustion engine, the accurate control of the flow of exhaust gas led to an air suction side can be ensured.

Drawings

Fig. 1 is a schematic structural diagram of a fluid bypass system according to an embodiment of the present invention.

In the figure:

1. a main pipeline; 11. a first butterfly valve; 12. a second flow sensor; 13. a differential pressure sensor; 14. a back pressure sensor;

2. a bypass line; 21. a second butterfly valve; 22. a first flow sensor;

3. a telescopic linkage shaft;

4. and measuring the pipeline.

Detailed Description

In order to make the technical problem solved by the present invention, the technical solution adopted by the present invention and the technical effect achieved by the present invention clearer, the technical solution of the present invention will be further explained by combining the drawings and by means of the specific implementation manner. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements related to the present invention are shown in the drawings.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used in the orientation or positional relationship shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.

As shown in fig. 1, the present embodiment provides a fluid bypass system, which includes a main pipeline 1, a bypass pipeline 2, a retractable linkage shaft 3, a first flow sensor 22 and a control component. Wherein main line 1 includes import and export, be equipped with first butterfly valve 11 in main line 1, bypass pipeline 2 communicates in main line 1, be equipped with second butterfly valve 21 in bypass pipeline 2, the both ends of scalable universal driving shaft 3 are connected respectively in first butterfly valve 11 and second butterfly valve 21, scalable universal driving shaft 3 can make first butterfly valve 11 and second butterfly valve 21 keep the linkage, first flow sensor 22 is used for detecting the fluid flow in the bypass pipeline 2, the control assembly electricity is connected in second butterfly valve 21 and first flow sensor 22, and can control the flexible of scalable universal driving shaft 3. Specifically, the opening and closing degree of the second butterfly valve 21 and the telescopic length of the telescopic linkage shaft 3 jointly influence the opening and closing degree of the first butterfly valve 11, so that different opening and closing degrees of the first butterfly valve 11 and the second butterfly valve 21 under different working conditions can be realized, the distribution of the flow of the fluid in the main pipeline 1 and the bypass pipeline 2 in the fluid bypass system is realized, and when the fluid is applied to an exhaust system of an internal combustion engine, the accurate control of the flow of the exhaust gas led to the air suction side can be ensured.

Further, in order to realize accurate control of the fluid flow, the fluid bypass system of the present embodiment further includes a second flow sensor 12, the second flow sensor 12 is used for detecting the fluid flow at the outlet end of the main pipeline 1, and the second flow sensor 12 is electrically connected to the control assembly. Specifically, when the opening and closing degree of the second butterfly valve 21 is changed, that is, the flow rate through the bypass pipeline 2 is changed, and the flow rate and the flow speed of the fluid passing through the main pipeline 1 are also changed, therefore, the second flow sensor 12 is selectively arranged on the main pipeline 1, and the signal can also be fed back to a control component (not shown in the figure), and the control component can jointly regulate and control according to the information collected by the first flow sensor 22 and the second flow sensor 12, so as to achieve the required optimal value of the exhaust gas bypass flow.

In addition, the first butterfly valve 11 is provided in the main pipe 1, and when the first butterfly valve 11 and the second butterfly valve 21 are interlocked, it can be understood that the degree of opening and closing of the first butterfly valve 11 is also changed, and the change of the first butterfly valve 11 further affects the change of the back pressure of the exhaust system. Therefore, the fluid bypass system provided by the present embodiment further includes a back pressure sensor 14, the back pressure sensor 14 is capable of detecting the back pressure at the inlet end of the main pipeline 1, and the back pressure sensor 14 is electrically connected to the control component. It will be appreciated that the back pressure is primarily used to detect the pressure exerted by the fluid exiting the exhaust system when it is obstructed at the inlet end of the main conduit 1, so the value of back pressure detected in the present system should be as small as possible.

Further, when the fluid flows through the main pipeline 1, because of the arrangement of the first butterfly valve 11, the fluid is obstructed, so that the flow speed of the fluid is reduced or the flow rate of the fluid is reduced, thereby causing the pressure in the main pipeline 1 to change. Therefore, in order to detect the influence of the opening and closing degree of the first butterfly valve 11 on the pressure in the main pipe 1, the fluid bypass system provided by the embodiment further comprises a differential pressure sensor 13, wherein the differential pressure sensor 13 is used for detecting the pressure difference between the upstream of the first butterfly valve 11 and the downstream of the first butterfly valve 11, and the differential pressure sensor 13 is electrically connected to the control component.

Specifically, the pressure difference upstream and downstream of the first butterfly valve 11 in the main pipe 1 and the back pressure of the exhaust system are mutually influenced, and the two have a limit value for ensuring the optimal exhaust emission in the bypass pipe 2 under different working conditions. Similarly, the differential pressure sensor 13 and the back pressure sensor 14 can also feed back signals to the control component, and the control component can jointly regulate and control the telescopic length of the telescopic linkage shaft 3 according to the information collected by the differential pressure sensor 13 and the back pressure sensor 14, so as to regulate the opening and closing degree of the first butterfly valve 11.

In order to realize the measurement of the upstream and downstream pressure difference of the first butterfly valve 11 disposed in the main pipeline 1 by the pressure difference sensor 13, the fluid bypass system provided in this embodiment further includes a measuring pipeline 4, the pressure difference sensor 13 is disposed in the measuring pipeline 4, two ends of the measuring pipeline 4 are both communicated with the main pipeline 1, one end of the measuring pipeline 4 is located upstream of the first butterfly valve 11, and the other end is located downstream of the first butterfly valve 11. With this arrangement, the pressures at the upstream of the first butterfly valve 11 and the downstream of the first butterfly valve 11 can directly act on the diaphragm of the differential pressure sensor 13, so that the diaphragm generates a micro-displacement, and then the corresponding pressure values are converted and output, thereby completing the measurement of the upstream and downstream pressure differences of the first butterfly valve 11.

In addition, in the fluid bypass system provided in the present embodiment, when the fluid bypass system is in the initial position, the first butterfly valve 11 is in the fully open state, and the second butterfly valve 21 is in the fully closed state, that is, the fluid can only flow out through the outlet end of the main pipeline 1. In particular, the first butterfly valve 11 comprises a first butterfly plate, and in this embodiment, the first butterfly valve 11 is disposed at a pipeline intersection formed by the main pipeline and the bypass pipeline, it can be understood that when the first butterfly valve 11 is disposed at the pipeline intersection, that is, no matter whether the first butterfly plate is opened or closed, the main pipeline 1 cannot be completely closed, but the first butterfly valve 11 is disposed to adjust the back pressure of the exhaust system and change the flow direction of the fluid in the main pipeline 1 and the pressure difference upstream and downstream of the first butterfly valve 11.

Optionally, in another embodiment, the first butterfly valve 11 is disposed in the main pipeline 1 and is not at a pipeline intersection, so that the first butterfly plate can open or close the main pipeline 1 completely, and of course, the main pipeline 1 may not be closed in an application according to actual needs.

The second butterfly valve 21 disposed in the bypass pipeline 2 is used for adjusting the flow rate of the fluid in the bypass pipeline 2, specifically, the second butterfly valve 21 includes a second butterfly plate, the opening or closing of the bypass pipeline 2 can be realized by adjusting the position of the second butterfly plate relative to the bypass pipeline 2, and the opening and closing degree of the bypass pipeline 2 directly affects the flow rate of the fluid in the bypass pipeline 2.

In this embodiment, the control component can directly control the telescopic length of the telescopic linkage shaft 3. Specifically, the retractable linkage shaft 3 includes a first linkage shaft and a second linkage shaft sleeved on the first linkage shaft, the second linkage shaft can move along the axial direction of the first linkage shaft, the first linkage shaft is connected to the first butterfly valve 11, and the second linkage shaft is connected to the second butterfly valve 21. With this arrangement, the degree of opening and closing of the second butterfly valve 21 can be directly controlled, and the degree of opening and closing of the first butterfly valve 11 is controlled by the degree of opening and closing of the second butterfly valve 21 and the telescopic length of the telescopic linkage shaft 3. Of course, in order to ensure the linkage of the first butterfly valve 11 and the second butterfly valve 21 by the telescopic linkage shaft 3, the first linkage shaft should be connected to the first butterfly plate, and the second linkage shaft should be connected to the second butterfly plate.

Specifically, because in the present embodiment, when the fluid bypass system is in the initial position, the first butterfly valve 11 is in the fully open state, and the second butterfly valve 21 is in the fully closed state. Therefore, the retractable linkage shaft 3 disposed between the first butterfly valve 11 and the second butterfly valve 21 can control the opening degree of the first butterfly valve 11 to decrease as the opening degree of the second butterfly valve 21 increases, that is, as the opening degree of the second butterfly valve 21 increases, the opening degree of the first butterfly valve 11 decreases gradually. However, since the telescopic length of the telescopic linkage shaft 3 can be changed, it also means that the ratio of the opening and closing degree of the first butterfly valve 11 to the second butterfly valve 21 is not constant, i.e. it can be adjusted according to different working condition requirements.

As described above, in the fluid bypass system, when the control unit controls the second butterfly valve 21 and the retractable linkage shaft 3 based on the feedback of the first flow sensor 22, the second flow sensor 12, the differential pressure sensor 13, and the back pressure sensor 14, there are three cases in which the opening degree of the second butterfly valve 21 is changed while the length of the retractable linkage shaft 3 is not changed, and in this case, the opening degree of the first butterfly valve 11 is changed to be equal to the opening degree of the second butterfly valve 21; secondly, the opening degree of the second butterfly valve 21 is changed, the telescopic length of the telescopic linkage shaft 3 is changed, and under the condition, the opening and closing degrees of the first butterfly valve 11 and the second butterfly valve 21 are inconsistent; thirdly, the opening degree of the second butterfly valve 21 is unchanged, and the expansion length of the telescopic linkage shaft 3 is changed, in this case, the opening degree of the second butterfly valve 21 is unchanged, and the opening degree of the first butterfly valve 11 is still variable.

Finally, in the present embodiment, as shown in fig. 1, the main pipe 1 is disposed perpendicular to the bypass pipe 2. However, in other embodiments, the main pipeline 1 and the bypass pipeline 2 may also be disposed at a predetermined included angle and not vertically, that is, the intersection angle and position of the main pipeline 1 and the bypass pipeline 2 may be adjusted according to the installation or design space of the actual fluid bypass system.

The above embodiments have been described only the basic principles and features of the present invention, and the present invention is not limited by the above embodiments, and is not departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (10)

1. A fluid bypass system, comprising:

the main pipeline (1) comprises an inlet and an outlet, and a first butterfly valve (11) is arranged in the main pipeline (1);

the bypass pipeline (2) is communicated with the main pipeline (1), and a second butterfly valve (21) is arranged in the bypass pipeline (2);

a telescopic linkage shaft (3) with two ends respectively connected to the first butterfly valve (11) and the second butterfly valve (21), wherein the telescopic linkage shaft (3) is configured to enable the first butterfly valve (11) and the second butterfly valve (21) to keep linkage;

-a first flow sensor (22) for detecting a fluid flow in the bypass line (2);

and the control assembly is electrically connected with the second butterfly valve (21) and the first flow sensor (22) and can control the expansion and contraction of the telescopic universal driving shaft (3).

2. The fluid bypass system according to claim 1, further comprising a second flow sensor (12), the second flow sensor (12) being configured to detect a fluid flow at the outlet end of the main line (1), the second flow sensor (12) being electrically connected to the control assembly.

3. The fluid bypass system according to claim 1, further comprising a back pressure sensor (14), the back pressure sensor (14) being configured to be able to detect a back pressure at an inlet end of the main line (1), the back pressure sensor (14) being electrically connected to the control assembly.

4. The fluid bypass system according to any of claims 1-3, further comprising a differential pressure sensor (13), the differential pressure sensor (13) configured to detect a pressure difference upstream of the first butterfly valve (11) and downstream of the first butterfly valve (11), the differential pressure sensor (13) being electrically connected to the control assembly.

5. The fluid bypass system according to claim 4, further comprising a measuring pipe (4), wherein the differential pressure sensor (13) is disposed on the measuring pipe (4), both ends of the measuring pipe (4) are communicated with the main pipe (1), and one end of the measuring pipe (4) is located upstream of the first butterfly valve (11) and the other end is located downstream of the first butterfly valve (11).

6. The fluid bypass system according to claim 1, characterized in that the first butterfly valve (11) comprises a first butterfly plate configured to be able to open or completely close the main pipeline (1).

7. A fluid bypass system according to claim 1, characterized in that the main pipeline (1) forms a pipeline junction with the bypass pipeline (2), and the first butterfly valve (11) comprises a first butterfly plate located at the pipeline junction to keep the main pipeline (1) open at all times.

8. The fluid bypass system according to claim 6 or 7, characterized in that the second butterfly valve (21) comprises a second butterfly plate configured to be able to open or close the bypass line (2).

9. The fluid bypass system according to claim 1, wherein the retractable linkage shaft (3) comprises a first linkage shaft and a second linkage shaft sleeved on the first linkage shaft, the second linkage shaft can move along the axial direction of the first linkage shaft, the first linkage shaft is connected to the first butterfly valve (11), and the second linkage shaft is connected to the second butterfly valve (21).

10. The fluid bypass system according to claim 1, characterized in that the main conduit (1) is arranged perpendicular to the bypass conduit (2); or

The main pipeline (1) and the bypass pipeline (2) are not vertically arranged.

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