CN220505210U - Gas flow control device and engine system - Google Patents

Abstract

The utility model discloses a gas flow control device and an engine system, and relates to the technical field of engine air inlet flow control. The gas flow control device comprises a valve body, a Laval pipe and a pressure decoupling module, wherein the valve body is provided with a gas inlet and a front chamber, the gas inlet is communicated with the front chamber through a pressure regulating mechanism, and the pressure regulating mechanism is used for regulating the pressure of the front chamber; the Laval pipe comprises an inlet and an outlet, wherein the inlet is communicated with the front chamber; the pressure decoupling module is arranged between the outlet and the pressure regulating mechanism, can selectively decouple or couple the outlet and the pressure regulating mechanism, and can control the circulation direction of gas when the outlet is coupled with the pressure regulating mechanism, so as to ensure the pressure stability of the front cavity or realize closed-loop regulation, and has higher control precision.

Description

Gas flow control device and engine system

Technical Field

The utility model relates to the technical field of engine gas flow control, in particular to a gas flow control device and an engine system.

Background

As engine emissions become more stringent, there is an urgent need for precise control of the engine intake process. The gas flow control device is connected with the gas inlet pipe of the engine, and can realize controllable, accurate and stable gas inlet control of the engine.

At present, a gas flow control device is generally provided with a two-stage adjusting mechanism, wherein the one-stage adjusting mechanism is used for adjusting the pressure in the inner cavity of a valve, the two-stage adjusting mechanism is used for controlling the displacement of a valve core, further controlling the sectional area of a throat opening of a venturi tube, achieving the purpose of changing the gas flow area, enabling the gas passing through the venturi tube to achieve a supersonic state through adjusting the pressure in the cavity, and controlling the gas flow through controlling the sectional area of the throat opening of the venturi tube. However, the primary adjusting mechanism adopts the primary motor actuator, so that the product cost is increased, and the magnetic field of a feedback system of the secondary motor actuator is interfered, so that the control precision of the secondary motor actuator is affected. In order to solve the above problems, the pressure parameters in the cavity are kept stable by setting the pressure adjusting mechanism driven by the mechanical mechanism, the gas pressure at the outlet of the venturi tube is directly fed back to the pressure adjusting mechanism, but the gas pressure at the outlet of the venturi tube is influenced by the conventional pressure fluctuation (the pressure fluctuation does not occur in the air inlet pipe of the engine) under the steady-state working condition and then can be fed back to the adjusting control of the pressure adjusting mechanism, so that the air in the cavity is disturbed, the disturbed gas can cause the pressure fluctuation, the valve rod position of the electromagnetic actuating mechanism is required to control the throat opening cross section area of the venturi tube to perform flow compensation, thus affecting the flow control precision of the system and also providing higher requirements for control.

Disclosure of Invention

The utility model aims to provide a gas flow control device and an engine system, so that the inlet pressure of a Laval pipe is stable under a steady-state working condition, and the gas flow control device and the engine system can be adjusted along with the change of the outlet pressure of the Laval pipe under a transient change working condition, so that the gas flow control precision is higher.

To achieve the purpose, the utility model adopts the following technical scheme:

a gas flow control device, comprising:

the valve body is provided with an air inlet and a front cavity, the air inlet is communicated with the front cavity through a pressure regulating mechanism, and the pressure regulating mechanism is used for regulating the pressure of the front cavity;

a laval tube comprising an inlet and an outlet, the inlet communicating with the front chamber;

the pressure decoupling module is arranged between the outlet and the pressure regulating mechanism, can selectively decouple or couple the outlet and the pressure regulating mechanism, and can control the flowing direction of gas when the outlet is coupled with the pressure regulating mechanism.

As an alternative scheme of the gas flow control device, the pressure regulating mechanism comprises a pressure regulator valve, a diaphragm and a spring, a pressure regulating cavity is arranged in the valve body, the pressure regulator valve and the spring are respectively connected to two sides of the diaphragm, the diaphragm divides the pressure regulating cavity into a pressure regulator valve cavity and a pressure regulator spring cavity, the pressure regulator valve cavity is communicated with the gas inlet and the front cavity through the pressure regulator valve, and the pressure regulator valve can be driven by the diaphragm to move to regulate the opening of the gas inlet so as to regulate the gas flow entering the front cavity.

As an alternative of the gas flow control device, a first gas feedback passage and a second gas feedback passage are arranged in parallel between the outlet and the pressure regulator spring cavity;

the pressure decoupling module comprises a first electromagnetic valve, a first one-way valve, a second electromagnetic valve and a second one-way valve, wherein the first electromagnetic valve and the first one-way valve are arranged in the first gas feedback passage, and the first one-way valve is used for one-way conduction from the outlet to the pressure regulator spring cavity;

the second electromagnetic valve and the second one-way valve are arranged in the second gas feedback passage, and the second one-way valve is used for one-way conduction from the pressure regulator spring cavity to the outlet.

As an alternative scheme of the gas flow control device, the valve body is further provided with a gas feedback inlet and a gas feedback outlet, the gas feedback inlet is located in a cavity where the outlet is located, the gas feedback outlet is located in the pressure regulator spring cavity, one end of the first gas feedback passage and one end of the second gas feedback passage are both communicated with the gas feedback inlet, and the other end of the first gas feedback passage and the other end of the second gas feedback passage are both communicated with the gas feedback outlet.

As an alternative to the gas flow control device, the first electromagnetic valve and the second electromagnetic valve are both electromagnetic switch valves or electromagnetic proportional valves.

As an alternative to the gas flow control device, the front chamber is provided with a first pressure sensor for detecting the pressure of the front chamber.

As an alternative to the gas flow control device, the outlet is provided with a second pressure sensor for detecting the pressure of the outlet.

As an alternative to the gas flow control device, the gas flow control device further includes an electromagnetic actuator and a valve rod, the valve rod is connected with the laval tube through the front chamber, the electromagnetic actuator drives the valve rod to move, and the throat section area of the laval tube is adjusted to control the gas flow of the outlet.

As an alternative to the gas flow control device, the electromagnetic actuator is a motor.

An engine system comprising an engine air intake pipe and a gas flow control device according to any one of the above aspects, the engine air intake pipe being connected to an outlet of the gas flow control device.

The utility model has the beneficial effects that:

according to the gas flow control device provided by the utility model, the pressure decoupling module is arranged between the outlet of the Laval pipe and the pressure regulating mechanism for regulating the pressure of the front chamber, the ratio of the pressure of the front chamber to the pressure of the outlet is calculated according to the pressure of the front chamber and the pressure of the outlet of the Laval pipe, and whether the ratio of the pressure of the front chamber to the pressure of the outlet is in the range of the set pressure ratio is judged. And selectively decoupling or coupling the outlet and the front chamber according to the judging result, and controlling the flowing direction of the gas when the outlet is coupled with the front chamber, so that the ratio of the pressure of the front chamber to the pressure of the outlet is in the range of the target pressure ratio, and the control precision of the gas flow is improved.

According to the engine system provided by the utility model, the engine air inlet pipe is connected with the outlet of the gas flow control device, so that the accurate and stable control of the engine air inlet can be realized.

Drawings

FIG. 1 is a schematic diagram of a gas flow control device according to an embodiment of the present utility model;

FIG. 2 is a cross-sectional view of a gas flow control device according to an embodiment of the present utility model;

FIG. 3 is an exploded view of a gas flow control device provided in an embodiment of the present utility model;

FIG. 4 is a cross-sectional view of a gas flow control device provided in an embodiment of the present utility model;

FIG. 5 is an exploded view of a pressure decoupling module provided by an embodiment of the present utility model;

FIG. 6 is a schematic diagram of a structure in which an outlet is connected to a pressure adjustment mechanism through a pressure decoupling module according to an embodiment of the present utility model;

FIG. 7 is a second cross-sectional view of a gas flow control device according to an embodiment of the present utility model;

FIG. 8 is a second cross-sectional view of a gas flow control device according to an embodiment of the present utility model;

FIG. 9 is a schematic illustration of a Laval pipe engaged with a valve stem according to an embodiment of the present utility model;

fig. 10 is a schematic diagram of an operating principle of a pressure decoupling module according to an embodiment of the present utility model;

fig. 11 is a flowchart of a gas flow control method according to an embodiment of the present utility model.

In the figure:

1. a valve body; 11. an air inlet; 12. a front chamber; 13. a first gas feedback path; 14. a second gas feedback path; 15. a gas feedback inlet; 16. a gas feedback outlet;

2. a pressure regulating mechanism; 21. a pressure regulator valve; 22. a diaphragm; 23. a spring;

3. a Laval pipe; 31. an inlet; 32. an outlet;

4. a pressure decoupling module; 41. a first electromagnetic valve; 42. a first one-way valve; 43. a second electromagnetic valve; 44. a second one-way valve;

5. an electromagnetic actuator;

6. a valve stem;

7. and a controller.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.

Unless specifically stated or limited otherwise, the terms "mounted," "connected," and "fixed" are to be construed broadly, and may be, for example, either fixed or removable; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

Unless expressly stated or limited otherwise, a first feature being "above" or "below" a second feature may include the first feature and the second feature being in direct contact, or may include the first feature and the second feature not being in direct contact but being in contact with each other by way of additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

The technical scheme of the utility model is further described below by the specific embodiments with reference to the accompanying drawings.

As shown in fig. 1 to 10, the present embodiment provides a gas flow control device, which includes a valve body 1, a laval pipe 3 and a pressure decoupling module 4, wherein an air inlet 11 and a front chamber 12 are provided on the valve body 1, the air inlet 11 is communicated with the front chamber 12 through a pressure adjusting mechanism 2, the pressure adjusting mechanism 2 is used for adjusting the pressure of the front chamber 12, the front chamber 12 is provided with a first pressure sensor, and the first pressure sensor is used for detecting the pressure of the front chamber 12. The Laval pipe 3 comprises an inlet 31 and an outlet 32, the inlet 31 is communicated with the front chamber 12, the outlet 32 is provided with a second pressure sensor which is used for detecting the pressure of the outlet 32, and an engine air inlet pipe is connected with the outlet 32 so as to realize accurate control of the air inlet flow of the engine. In other embodiments, since the intake pipe of the engine is provided with a pressure sensor, the outlet 32 may not be provided with a pressure sensor, and the pressure of the outlet 32 may be obtained by subtracting the pressure loss from the pressure of the intake pipe of the engine.

Specifically, the pressure regulating mechanism 2 comprises a pressure regulator valve 21, a diaphragm 22 and a spring 23, a pressure regulating cavity is arranged in the valve body 1, the pressure regulator valve 21 and the spring 23 are respectively connected to two sides of the diaphragm 22, the pressure regulating cavity is divided into the pressure regulator valve cavity and the pressure regulator spring cavity by the diaphragm 22, the pressure regulator valve cavity is communicated with the air inlet 11 and the front cavity 12 through the pressure regulator valve 21, the pressure regulator valve 21 can be driven to move by the pressure regulator spring cavity through the diaphragm 22, and the opening of the air inlet 11 is regulated so as to regulate the air flow entering the front cavity 12. The gas enters the pressure regulating cavity in the valve body 1 from the gas inlet 11 of the valve body 1, the pressure regulating mechanism 2 is arranged in the pressure regulating cavity, and the pressure parameters entering the front cavity 12 are kept stable through the pressure regulating mechanism 2.

The gas flow control device further comprises an electromagnetic actuator 5 and a valve rod 6, wherein the valve rod 6 passes through the front chamber 12 and is connected with the Laval pipe 3, the electromagnetic actuator 5 drives the valve rod 6 to move, and the throat section area of the Laval pipe 3 is regulated so as to control the gas flow of the outlet 32.

Alternatively, the electromagnetic actuator 5 is a motor.

The pressure ratio of the inlet 31 and the outlet 32 of the laval tube 3 is maintained under the condition that the gas in the laval tube 3 can reach a supersonic state by the cooperation of the pressure adjusting mechanism 2 and the electromagnetic actuator 5. In this embodiment, only one electromagnetic actuator 5 is needed, the pressure regulating mechanism 2 adopts a mechanical pressure regulating mechanism, a primary motor or an electromagnetic actuator is omitted, and through the mechanical pressure regulating structure, the structure is simple, the accurate control of the continuous flow valve on the gas flow can be realized more simply, and meanwhile, the cost of the product is reduced.

However, since the pressure of the outlet 32 is affected by the pressure fluctuation of the intake pipe of the engine, the outlet 32 is usually communicated with the pressure regulator spring cavity through the gas feedback passage, so that the pressure of the gas of the outlet 32 is used as an actuating factor of the pressure regulator valve 21, the pressure of the front chamber 12 is regulated together with the pressure regulating mechanism 2, the pressure of the front chamber 12 and the pressure of the outlet 32 form a linear relationship, the effect of keeping the pressure difference between the inlet 31 and the outlet 32 of the Laval pipe 3 constant can be achieved, the gas pressure of the front chamber 12 is regulated along with the fluctuation of the pressure of the outlet 32, and therefore, when the pressure of the outlet 32 is reduced, the gas pressure of the front chamber 12 is reduced, and the pressure ratio of the inlet 31 and the outlet 32 of the Laval pipe 3 can be ensured to be kept under the condition that the gas of the Laval pipe 3 is in a supersonic state. As the pressure of the outlet 32 becomes larger, the gas pressure of the inlet 31 of the laval tube 3 becomes larger, so that the ratio of the pressure of the inlet 31 to the outlet 32 of the laval tube 3 is maintained under the condition that the gas of the laval tube 3 is in a supersonic state.

However, under steady state conditions, the normal pressure fluctuations at the outlet 32 (which do not occur in the engine intake) are also fed back into the regulation control of the pressure regulating mechanism 2, resulting in a disturbance of the gas in the front chamber 12, which causes the pressure in the front chamber 12 to fluctuate. In the prior art, the electromagnetic actuator 5 drives the valve rod 6 to move, so that the sectional area of the throat opening of the Laval pipe 3 is controlled to compensate the gas flow, but the flow control precision is affected.

In the present embodiment, by providing the pressure decoupling module 4 between the outlet 32 and the pressure adjusting mechanism 2, the pressure decoupling module 4 can selectively decouple or couple the outlet 32 and the pressure adjusting mechanism 2, and can control the flowing direction of the gas when the outlet 32 is coupled with the pressure adjusting mechanism 2. By arranging the pressure decoupling module 4, the outlet 32 and the pressure regulating mechanism 2 can be decoupled or coupled selectively according to different working conditions, and when the outlet 32 is coupled with the pressure regulating mechanism 2, the flowing direction of gas is controlled, so that the ratio of the pressure of the front chamber 12 to the pressure of the outlet 32 is within the range of the target pressure ratio, and the control accuracy of the gas flow is improved.

Specifically, a first gas feedback channel 13 and a second gas feedback channel 14 are arranged in parallel between the outlet 32 and the pressure regulator spring cavity, the pressure decoupling module 4 comprises a first electromagnetic valve 41, a first one-way valve 42, a second electromagnetic valve 43 and a second one-way valve 44, the first electromagnetic valve 41 and the first one-way valve 42 are arranged on the first gas feedback channel 13, the first one-way valve 42 is used for unidirectional conduction from the outlet 32 to the pressure regulator spring cavity, the second electromagnetic valve 43 and the second one-way valve 44 are arranged on the second gas feedback channel 14, and the second one-way valve 44 is used for unidirectional conduction from the pressure regulator spring cavity to the outlet 32.

As shown in fig. 6, the valve body 1 is further provided with a gas feedback inlet 15 and a gas feedback outlet 16, the gas feedback inlet 15 is located in a cavity where the outlet 32 is located, the gas feedback outlet 16 is located in a pressure regulator spring cavity, one end of the first gas feedback channel 13 and one end of the second gas feedback channel 14 are both communicated with the gas feedback inlet 15, the other end of the first gas feedback channel 13 and the other end of the second gas feedback channel 14 are both communicated with the gas feedback outlet 16, and gas in the cavity of the outlet 32 enters the first gas feedback channel 13 or the second gas feedback channel 14 through the gas feedback inlet 15 and then enters the pressure regulator spring cavity through the gas feedback outlet 16, so that a peak value of the gas of the outlet 32 refreshes the highest value of the pre-chamber 12 or a valley value of the gas of the outlet 32 refreshes the lowest value of the pre-chamber 12.

The engine system comprises a controller 7, a first pressure sensor and a second pressure sensor are in signal connection with the controller 7, a first electromagnetic valve 41 and a second electromagnetic valve 43 are in electric connection with the controller 7, the first pressure sensor sends the detected pressure of the front chamber 12 to the controller 7, the second pressure sensor sends the detected pressure of the outlet 32 to the controller 7, the pressure of the front chamber 12 is approximately equal to the pressure of the inlet 31 of the Laval pipe 3, the controller 7 calculates the ratio of the pressure of the front chamber 12 to the pressure of the outlet 32 according to the received pressure of the front chamber 12 and the pressure of the outlet 32, and compares the ratio with a target pressure ratio range, wherein the target pressure ratio range is the ratio of the pressure of the front chamber 12 to the pressure of the outlet 32 when the gas in the Laval pipe 3 is in a supersonic state, the controller 7 performs closed-loop adjustment with the target pressure ratio range, and the high response and the quick feedback function of the pressure of the front chamber 12 to the pressure of the outlet 32 are kept under necessary working conditions, so that the gas flow control device can accurately control under the target pressure ratio range.

Specifically, when the ratio of the pressure of the front chamber 12 to the pressure of the outlet 32 calculated by the controller 7 is within the target pressure ratio range, the controller 7 controls both the first solenoid valve 41 and the second solenoid valve 43 to be closed, and the conventional pressure fluctuation of the outlet 32 does not affect the pressure of the front chamber 12. When the ratio of the pressure of the front chamber 12 to the pressure of the outlet 32 is not in the target pressure ratio range, which means that the gas in the laval tube 3 does not form a supersonic flow yet, the pressure of the outlet 32 needs to be used as an actuating factor of the regulator valve 21 to regulate the pressure of the front chamber 12 together with the pressure regulating mechanism 2 so that the ratio of the pressure of the front chamber 12 to the pressure of the outlet 32 is in the target pressure ratio range.

The target pressure ratio range is between the set pressure maximum limit value and the set pressure minimum limit value, when the ratio of the pressure of the front chamber 12 to the pressure of the outlet 32 is smaller than the set pressure minimum limit value, which means that the pressure of the front chamber 12 is smaller, the pressure of the front chamber 12 needs to be increased, at this time, the controller 7 controls the first electromagnetic valve 41 to be opened, so that the gas of the outlet 32 can enter the pressure regulator spring cavity through the first one-way valve 42, the peak of the gas pressure of the outlet 32 continuously refreshes the highest value of the pressure of the front chamber 12, the pressure of the front chamber 12 continuously rises until the ratio of the pressure of the front chamber 12 to the pressure of the outlet 32 reaches the target pressure ratio range, and the first electromagnetic valve 41 is closed, so that the ratio of the pressure of the front chamber 12 to the pressure of the outlet 32 reaches the target pressure ratio range.

When the ratio of the pressure of the front chamber 12 to the pressure of the outlet 32 is greater than the set pressure maximum limit value, which indicates that the pressure of the front chamber 12 is greater, the pressure of the front chamber 12 needs to be adjusted to be smaller, at this time, the controller 7 controls the second electromagnetic valve 43 to be opened, so that the pressure regulator spring cavity is communicated with the outlet 32 through the second gas feedback passage 14, and the trough of the gas pressure of the outlet 32 continuously refreshes the lowest value of the pressure of the front chamber 12 under the action of the gas pressure of the outlet 32, so that the pressure of the front chamber 12 is reduced until the ratio of the pressure of the front chamber 12 to the pressure of the outlet 32 reaches the target pressure ratio range, and controls the second electromagnetic valve 43 to be closed, so that the ratio of the pressure of the front chamber 12 to the pressure of the outlet 32 reaches the target pressure ratio range.

Namely, in the pressure decoupling module 4 provided in this embodiment, under the steady-state working condition, and when the ratio of the pressure of the front chamber 12 to the pressure of the outlet 32 is within the target pressure ratio range, the first electromagnetic valve 41 and the second electromagnetic valve 43 are both closed, the gas feedback path is disconnected, and the gas flow control device operates without feedback. Under transient conditions, the ratio of the pressure of the front chamber 12 to the pressure of the outlet 32 is controlled through the gas feedback path, closed-loop control is performed by taking the target pressure ratio range as a target, the direction is explicitly regulated, the ratio of the pressure of the front chamber 12 to the pressure of the outlet 32 is controlled to a controllable state, and the ratio of the pressure of the front chamber 12 to the pressure of the outlet 32 is accurately controlled, so that the gas flow control device is more accurate in flow control.

Further, the first solenoid valve 41 and the second solenoid valve 43 are both electromagnetic on-off valves or electromagnetic proportional valves. The electromagnetic switch valve can control the on-off of the first gas feedback passage 13 and the second gas feedback passage 14, and the electromagnetic proportional valve can control the on-off of the first gas feedback passage 13 and the second gas feedback passage 14, and can control the flow of gas, so that the accurate control is further realized.

The electromagnetic valve and the one-way valve in the pressure decoupling module 4 have lower cost, and electromagnetic interference generated by arranging two-stage electromagnetic mechanisms in the prior art is reduced or avoided, in addition, the pressure of the gas feedback passage in the embodiment is far smaller than that of the gas inlet 11, and the energy consumption is smaller.

In the gas flow control device provided by the embodiment, the mechanical structure is adopted in the pressure regulating mechanism 2 to be used for pressure feedback control, the one-way valve is used for guiding the gas direction, and the simple electromagnetic valve can be adopted for driving and controlling on-off for pressure regulating control, so that the software and hardware design of the control logic and the driving circuit can be greatly simplified, the failure items of the gas flow control device are reduced, and the reliability and the robustness of the gas flow control device are improved.

As shown in fig. 11, the present embodiment further provides a gas flow control method, which is applied to the above-mentioned gas flow control device, and includes the following steps:

s10, acquiring the pressure of the front chamber 12 and the pressure of the outlet 32, and calculating the ratio of the pressure of the front chamber 12 to the pressure of the outlet 32.

The pressure of the front chamber 12 detected by the first pressure sensor and the pressure of the outlet 32 detected by the second pressure sensor are both sent to the controller 7, and the controller 7 calculates the ratio of the pressure of the front chamber 12 to the pressure of the outlet 32 according to the received pressure of the front chamber 12 and the pressure of the outlet 32.

S20, judging whether the ratio of the pressure of the front chamber 12 to the pressure of the outlet 32 is within a target pressure ratio range; if yes, executing S31; if not, S32 is performed.

S31, the outlet 32 is decoupled from the pressure regulating mechanism 2 by the pressure decoupling module 4.

The pressure regulating mechanism 2 comprises a pressure regulator valve 21 and a spring 23 which are connected through a diaphragm 22, wherein the cavity where the spring 23 is positioned is a pressure regulator spring cavity, an outlet 32 is communicated with the pressure regulator spring cavity through a gas feedback passage, and the pressure of the front cavity 12 is influenced by the conventional pressure fluctuation of the outlet 32, so that the pressure stability of the front cavity 12 is influenced. Specifically, the air inlet 11 is communicated with the front chamber 12 through the pressure regulator valve cavity, the pressure regulator valve 21 is abutted against the air inlet 11, the pressure change of the pressure regulator spring cavity influences the opening degree of the air inlet 11, and further influences the air flow entering the front chamber 12 through the pressure regulator valve cavity, and under the condition that the volume and the temperature of the front chamber 12 are unchanged, the larger the air flow entering the front chamber 12, the larger the pressure in the front chamber 12, namely the pressure of the inlet 31.

Specifically, the pressure decoupling module 4 includes a first solenoid valve 41, a first check valve 42, a second solenoid valve 43, and a second check valve 44, a first gas feedback path 13 and a second gas feedback path 14 are disposed in parallel between the outlet 32 and the pressure adjustment mechanism 2, the first solenoid valve 41 and the first check valve 42 are disposed in the first gas feedback path 13, and the second solenoid valve 43 and the second check valve 44 are disposed in the second gas feedback path 14.

When the ratio of the pressure of the front chamber 12 to the pressure of the outlet 32 is within the target pressure ratio range, both the first solenoid valve 41 and the second solenoid valve 43 are controlled to be closed, i.e., both the first gas feedback path 13 and the second gas feedback path 14 are disconnected, so that the outlet 32 is decoupled from the pressure regulating mechanism 2.

When the ratio of the pressure of the front chamber 12 to the pressure of the outlet 32 is within the target pressure ratio range, and under the steady-state working condition, in order to avoid that the conventional pressure fluctuation of the outlet 32 affects the ratio of the pressure of the front chamber 12 to the pressure of the outlet 32, the outlet 32 is decoupled from the pressure regulator spring cavity through the pressure decoupling module 4, and the controller 7 controls the first electromagnetic valve 41 and the second electromagnetic valve 43 to be closed, so that the outlet 32 is decoupled from the pressure regulator spring cavity, and the gas pressure of the front chamber 12 is ensured to be stable under the steady-state working condition.

And S32, coupling the outlet 32 with the pressure regulating mechanism 2 through the pressure decoupling module 4, and controlling the flowing direction of the gas so that the ratio of the pressure of the front chamber 12 to the pressure of the outlet 32 reaches the range of target pressure ratio.

Specifically, if the ratio of the pressure of the front chamber 12 to the pressure of the outlet 32 is greater than the set pressure maximum limit, the outlet 32 is coupled to the pressure regulating mechanism 2 by the pressure decoupling module 4, and the flow of gas from the pressure regulating mechanism 2 to the outlet 32 is controlled. Further, when the ratio of the pressure of the front chamber 12 to the pressure of the outlet 32 is greater than the highest limit value of the set pressure, the second electromagnetic valve 43 is controlled to be opened, the pressure regulator spring cavity is communicated with the outlet 32 through the second gas feedback passage 14, under the action of the gas pressure of the outlet 32, the gas in the pressure regulator spring cavity flows to the outlet 32 through the second one-way valve 44, the pressure of the pressure regulator spring cavity is reduced, the diaphragm 22 drives the pressure regulator valve 21 to move towards the direction close to the pressure regulator spring cavity, the opening of the air inlet 11 is reduced, the pressure of the front chamber 12 is further reduced, and the second electromagnetic valve 43 is controlled to be closed until the ratio of the pressure of the front chamber 12 to the pressure of the outlet 32 reaches the range of the target pressure ratio.

If the ratio of the pressure of the front chamber 12 to the pressure of the outlet 32 is less than the set pressure minimum, the outlet 32 is coupled to the front chamber 12 by the pressure decoupling module 4 and the flow of gas from the outlet 32 to the pressure regulating mechanism 2 is controlled. Further, when the ratio of the pressure of the front chamber 12 to the pressure of the outlet 32 is smaller than the set pressure minimum value, the first solenoid valve 41 is controlled to be opened, the gas of the outlet 32 flows to the pressure regulator spring cavity through the first check valve 42, the pressure regulator valve cavity is compressed by the diaphragm 22, the diaphragm 22 drives the pressure regulator valve 21 to move away from the pressure regulator spring cavity, the opening of the air inlet 11 is increased, the pressure of the front chamber 12 is further increased, and the first solenoid valve 41 is controlled to be closed until the ratio of the pressure of the front chamber 12 to the pressure of the outlet 32 reaches the target pressure ratio range.

According to the gas flow control method provided by the embodiment, the outlet 32 and the pressure regulating mechanism 2 can be decoupled or coupled through the pressure decoupling module 4 according to different working conditions, so that the pressure stability of the front chamber 12 or the regulation along with the pressure change of the engine air inlet pipe can be ensured, and the gas flow control precision is higher.

The present embodiment also provides an engine system including an engine air intake pipe and the gas flow rate control device as described above, the engine air intake pipe being connected to the outlet 32 of the gas flow rate control device. The gas flow control device adopts the gas flow control method to control the air inlet flow of the engine, and can selectively decouple or couple the outlet 32 with the front chamber 12 according to different working conditions, and control the gas circulation direction when the outlet 32 is coupled with the front chamber 12, so that the ratio of the pressure of the front chamber 12 to the pressure of the outlet 32 is within the range of the target pressure ratio, and the control precision of the gas flow is improved.

The foregoing is merely exemplary of the present utility model, and those skilled in the art should not be considered as limiting the utility model, since modifications may be made in the specific embodiments and application scope of the utility model in light of the teachings of the present utility model.

Claims (10)

1. A gas flow control device, comprising:

the valve body (1) is provided with an air inlet (11) and a front cavity (12), the air inlet (11) is communicated with the front cavity (12) through a pressure regulating mechanism (2), and the pressure regulating mechanism (2) is used for regulating the pressure of the front cavity (12);

-a laval tube (3) comprising an inlet (31) and an outlet (32), the inlet (31) being in communication with the front chamber (12);

and the pressure decoupling module (4) is arranged between the outlet (32) and the pressure regulating mechanism (2), can selectively decouple or couple the outlet (32) and the pressure regulating mechanism (2), and can control the flowing direction of gas when the outlet (32) is coupled with the pressure regulating mechanism (2).

2. The gas flow control device according to claim 1, wherein the pressure regulating mechanism (2) comprises a pressure regulator valve (21), a diaphragm (22) and a spring (23), a pressure regulating cavity is arranged in the valve body (1), the pressure regulator valve (21) and the spring (23) are respectively connected to two sides of the diaphragm (22), the pressure regulating cavity is divided into the pressure regulator valve cavity and the pressure regulator spring cavity by the diaphragm (22), the pressure regulator valve cavity is communicated with the gas inlet (11) and the front cavity (12) through the pressure regulator valve (21), and the pressure regulator valve (21) is driven to move by the pressure regulator spring cavity through the diaphragm (22), so that the opening degree of the gas inlet (11) is regulated, and the gas flow entering the front cavity (12) is regulated.

3. A gas flow control device according to claim 2, characterized in that a first gas feedback passage (13) and a second gas feedback passage (14) are arranged in parallel between the outlet (32) and the regulator spring chamber;

the pressure decoupling module (4) comprises a first electromagnetic valve (41), a first one-way valve (42), a second electromagnetic valve (43) and a second one-way valve (44), wherein the first electromagnetic valve (41) and the first one-way valve (42) are arranged in the first gas feedback passage (13), and the first one-way valve (42) is used for one-way conduction from the outlet (32) to the pressure regulator spring cavity;

the second electromagnetic valve (43) and the second one-way valve (44) are arranged on the second gas feedback passage (14), and the second one-way valve (44) is used for one-way conduction from the pressure regulator spring cavity to the outlet (32).

4. A gas flow control device according to claim 3, characterized in that the valve body (1) is further provided with a gas feedback inlet (15) and a gas feedback outlet (16), the gas feedback inlet (15) is located in a cavity where the outlet (32) is located, the gas feedback outlet (16) is located in the pressure regulator spring cavity, one end of the first gas feedback passage (13) and one end of the second gas feedback passage (14) are both communicated with the gas feedback inlet (15), and the other end of the first gas feedback passage (13) and the other end of the second gas feedback passage (14) are both communicated with the gas feedback outlet (16).

5. A gas flow control device according to claim 3, characterized in that the first solenoid valve (41) and the second solenoid valve (43) are both solenoid on-off valves or solenoid proportional valves.

6. A gas flow control device according to claim 1, characterized in that the front chamber (12) is provided with a first pressure sensor for detecting the pressure of the front chamber (12).

7. A gas flow control device according to claim 1, characterized in that the outlet (32) is provided with a second pressure sensor for detecting the pressure of the outlet (32).

8. A gas flow control device according to claim 1, characterized in that it further comprises an electromagnetic actuator (5) and a valve stem (6), said valve stem (6) being connected to said laval tube (3) through said pre-chamber (12), said electromagnetic actuator (5) driving said valve stem (6) to move, adjusting the throat cross-sectional area of said laval tube (3) to control the gas flow of said outlet (32).

9. A gas flow control device according to claim 8, characterized in that the electromagnetic actuator (5) is an electric motor.

10. Engine system, characterized by comprising an engine inlet pipe and a gas flow control device according to any of claims 1-9, said engine inlet pipe being connected to an outlet (32) of said gas flow control device.