Natural gas engine flow control valve

Abstract

The invention discloses a natural gas flow control valve which comprises a valve body component, a first-stage electromagnetic valve, a second-stage electromagnetic valve and a circuit board component. The valve body component comprises a valve body, a valve cavity and a secondary electromagnetic valve mounting cavity are formed in the valve body, an air inlet valve seat and an air outlet valve seat are mounted in the valve body, an air inlet hole is formed in the air inlet valve seat, and an air outlet hole is formed in the air outlet valve seat; the first-stage electromagnetic valve is vertically mounted in the air inlet valve seat and controls the opening and closing of the air inlet hole; natural gas entering from the air inlet hole enters the first-stage electromagnetic valve and the valve cavity and controls the pressure in the valve cavity; the secondary electromagnetic valve is obliquely mounted on the valve body and controls the opening and closing of the gas outlet hole, so that the flow of the flowing natural gas is accurately controlled; the circuit board component is mounted on the valve body; and a pressure sensor is arranged in the valve cavity, is in signal connection with the circuit board component and is used for measuring the pressure in the valve cavity, so that the opening degree of the primary electromagnetic valve is controlled through the circuit board component, and the gas pressure in the valve cavity is controlled.

Description

Technical Field

[0001] The invention relates to the technical field of flow control valves, and in particular to a flow control valve for a natural gas engine. Background Art

[0002] Natural gas is easy to mix with air in the engine and burn more completely, so the emission pollution of natural gas engines is significantly less than that of fuel engines. In recent years, natural gas engines have broad prospects and have developed rapidly. At present, the natural gas flow control valves of domestic natural gas engines still rely on foreign products, and domestic research in this field is relatively vacant.

[0003] China Invention Patent Application Publication No. CN105370464A discloses a supersonic fuel injection control valve, which uses a primary pressure regulating unit and a secondary flow control unit to work together to complete the technology of controlling the engine gas flow; and uses a sonic nozzle and high-precision valve core position control to achieve precise flow control technology. The present invention can achieve the perfect effect of precise gas flow control and energy saving and emission reduction. However, the patent application does not disclose the specific structure and cannot accurately control the pressure of natural gas. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a natural gas engine flow control valve which can accurately control the pressure and flow of natural gas and provide natural gas in a timely and quantitative manner to meet the combustion needs of natural gas engines, in order to solve the problem of the existing supersonic fuel injection control valve accurately controlling the pressure of natural gas.

[0005] The technical problem to be solved by the present invention can be achieved by the following technical solutions:

[0006] A natural gas flow control valve comprises a valve body component, a primary solenoid valve, a secondary solenoid valve and a circuit board component; the valve body component comprises a valve body, the valve body is provided with a valve cavity, a secondary solenoid valve mounting cavity, an inlet valve seat and an outlet valve seat, the inlet valve seat is provided with a primary solenoid valve mounting hole and an inlet hole, and the outlet valve seat is provided with an outlet hole; the primary solenoid valve is vertically mounted on the primary solenoid valve mounting hole of the inlet valve seat and controls the opening and closing of the inlet hole, the natural gas entering from the inlet hole enters the primary solenoid valve and the valve cavity and controls the pressure in the valve cavity; the secondary solenoid valve is obliquely mounted on the valve body and controls the opening and closing of the outlet hole, thereby accurately controlling the outflowing natural gas flow; the circuit board component is mounted on the valve body; a pressure sensor is arranged in the valve cavity, the pressure sensor is connected to the circuit board component by signal, and is used to measure the pressure in the valve cavity, and then the opening of the primary solenoid valve is controlled by the circuit board component, so as to control the gas pressure in the valve cavity.

[0007] In a preferred embodiment of the present invention, the first-level solenoid valve is installed in the first-level solenoid valve installation hole through a first-level solenoid valve cover and fasteners.

[0008] In a preferred embodiment of the present invention, the primary solenoid valve comprises:

[0009] A primary permanent magnet installed in the primary solenoid valve installation hole;

[0010] A primary electromagnetic coil component installed in the primary permanent magnet;

[0011] A primary spring sheet mounted on top of the primary permanent magnet via a fastener;

[0012] A primary solenoid valve stem longitudinally passes through the primary solenoid coil component, the top of the primary solenoid valve stem is connected to the primary spring sheet and is equipped with a primary piston;

[0013] An upper rubber membrane, a lower rubber membrane and a sealing plug are sequentially installed on the first-level solenoid valve stem from top to bottom and longitudinally pass through the bottom of the first-level solenoid coil component. After the sealing plug opens the air inlet, the gas entering the air inlet enters the valve cavity and the space between the upper rubber membrane and the lower rubber membrane.

[0014] In a preferred embodiment of the present invention, the secondary solenoid valve is installed in the secondary solenoid valve installation cavity through a secondary solenoid valve cover.

[0015] In a preferred embodiment of the present invention, the secondary solenoid valve comprises:

[0016] A secondary permanent magnet installed in the secondary solenoid valve installation cavity;

[0017] A secondary electromagnetic coil component installed in the secondary permanent magnet;

[0018] A secondary spring sheet mounted on top of the secondary permanent magnet via a fastener;

[0019] A secondary solenoid valve stem longitudinally passes through the secondary solenoid coil component, the top of which is connected to the secondary spring sheet and is equipped with a secondary piston; the secondary solenoid valve stem longitudinally passes through the bottom of the primary solenoid coil component and is equipped with a secondary valve plug, which is used to open and close the air outlet.

[0020] In a preferred embodiment of the present invention, an air outlet connector is further provided on the valve body, and an inner hole of the air outlet connector is communicated with the air outlet hole.

[0021] In a preferred embodiment of the present invention, a magnet is installed on the valve stem of the secondary solenoid valve, and a secondary magnetic field displacement sensor is arranged on the circuit board component. The secondary magnetic field displacement sensor is used to detect the position of the magnet following the movement of the valve stem of the secondary solenoid valve.

[0022] Due to the adoption of the above technical solution, the present invention can accurately control the pressure and flow of natural gas, and provide natural gas in a timely and quantitative manner to meet the combustion needs of the natural gas engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the appearance of the natural gas flow control valve of the present invention.

[0024] Figure 2 It is a schematic diagram of the internal structure of the natural gas flow control valve of the present invention.

[0025] Figure 3 It is a schematic diagram of the installation of the pressure sensor of the natural gas flow control valve of the present invention. DETAILED DESCRIPTION

[0026] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0027] See also Figures 1 to 3 A natural gas flow control valve shown in the figure includes a valve body component 2, a primary solenoid valve 1, a secondary solenoid valve 4 and a circuit board component 3.

[0028] The valve body component 2 includes a valve body 15 , in which a valve cavity 15 a and a secondary solenoid valve installation cavity 15 b are arranged, and an inlet valve seat 21 and an outlet valve seat 13 are installed.

[0029] The inlet valve seat 21 is connected to the upper end surface of the valve body 15. A first-stage electromagnetic valve mounting hole 21 and an inlet hole 22 are provided in the inlet valve seat 21, and an outlet hole 13a is provided in the outlet valve seat 13. The inlet hole 22 is connected to an inlet pipe (not shown in the figure), and natural gas can enter the inlet hole 22 from the inlet pipe.

[0030] The first-stage solenoid valve 1 is vertically mounted on the first-stage solenoid valve mounting hole 21a of the intake valve seat 21 and controls the opening and closing of the intake hole 22. The natural gas entering through the intake hole 22 is pressure-controlled through the first-stage solenoid valve 1 to enter the valve cavity 11a.

[0031] The first-level solenoid valve 1 is installed in the first-level solenoid valve installation hole 21 through the first-level solenoid valve cover 6 and the fastening bolts 1a. The first-level solenoid valve 1 specifically includes: a first-level permanent magnet 9, a first-level electromagnetic coil component 7, a first-level solenoid valve stem 8, a first-level spring sheet 5, an upper rubber membrane 10, a lower rubber membrane 11 and a sealing plug 12; the first-level permanent magnet 9 is installed in the first-level solenoid valve installation hole 21, the first-level electromagnetic coil component 7 is installed in the first-level permanent magnet 9, and the first-level spring sheet 5 is installed on the top of the first-level permanent magnet 9 through the fastening bolts 5a; the first-level solenoid valve stem 8 passes through the first-level electromagnetic coil component 7 longitudinally, and the top of the first-level solenoid valve stem 8 is connected to the first-level spring sheet 5 and is installed with a first-level piston 23;

[0032] The upper rubber membrane 10, the lower rubber membrane 11 and the sealing plug 12 are sequentially installed from top to bottom on the first-level solenoid valve stem 8 that passes longitudinally through the bottom of the first-level solenoid coil component 7. After the sealing plug 12 opens the air inlet 22, the gas entering the air inlet 22 enters the valve cavity 15a and the space between the upper rubber membrane 10 and the lower rubber membrane 11. In this way, the first-level solenoid coil component 7 is connected to the first-level solenoid valve stem 8, the sealing plug 12 and the first-level spring sheet 5 and can move up and down. When it moves to the bottom, the sealing plug 12 is sealed with the air inlet 22.

[0033] The secondary solenoid valve 4 is obliquely mounted on the valve body 15 and controls the opening and closing of the gas outlet 13a, thereby accurately controlling the outflowing natural gas flow. The secondary solenoid valve 4 is mounted in the secondary solenoid valve installation cavity 15b through the secondary solenoid valve cover 18. The secondary solenoid valve 4 comprises: a secondary permanent magnet 20, a secondary solenoid coil component 19, a secondary spring sheet 16 and a secondary solenoid valve stem 17. The secondary permanent magnet 20 is mounted in the secondary solenoid valve installation cavity 15b, the secondary solenoid coil component 19 is mounted in the secondary permanent magnet 20, the secondary spring sheet 16 is mounted on the top of the secondary permanent magnet 20 through the fastening bolt 16b, the secondary solenoid valve stem 17 longitudinally passes through the secondary solenoid coil component 19, the top of the secondary solenoid valve stem 17 is connected to the secondary spring sheet 16 and is installed with a secondary piston 24; the secondary solenoid valve stem 17 longitudinally passes through the bottom of the primary solenoid coil component 19 and is installed with a secondary valve plug 25, and the secondary valve plug 25 is used to open and close the gas outlet 13a. The valve body 15 is also provided with an outlet connector 14, the inner hole of which is connected to the outlet hole 13b, so that the secondary electromagnetic coil component 19 is connected to the secondary electromagnetic valve stem 17 and the secondary spring sheet 16, and can move up and down. The front end of the secondary valve plug 25 is a rubber sealing cone surface, which can cooperate with the outlet hole 13a on the outlet valve seat 13 for sealing.

[0034] The circuit board component 3 is installed on the valve body 15; a pressure sensor 26 is arranged in the valve cavity 15a, and the pressure sensor 26 is connected to the circuit board component 3 for signal measurement of the pressure in the valve cavity 15a, and then the opening of the first-stage solenoid valve 1 is controlled through the circuit board component 3, so as to control the gas pressure in the valve cavity 15a.

[0035] In addition, a magnet (not shown in the figure) is installed on the secondary solenoid valve stem 17, and a secondary magnetic field displacement sensor (not shown in the figure) is arranged on the circuit board component 3. The secondary magnetic field displacement sensor is used to detect the position of the magnet that moves with the secondary solenoid valve stem 17.

[0036] Working principle: When the current of the first-stage solenoid valve 1 is 0, the first-stage solenoid coil component 7 and the first-stage solenoid valve stem 8 and the sealing plug 12 connected thereto are in the initial position. At this time, the first-stage solenoid valve 1 is in the maximum open state, and the natural gas can enter the valve cavity 15a of the valve body and the space between the upper rubber membrane 10 and the lower rubber membrane 11 through the air inlet hole 22; when the first-stage solenoid valve 1 is energized, the first-stage solenoid coil component 7 is acted upon by the electromagnetic force, which is greater than the spring force of the first-stage spring sheet 5, driving the first-stage solenoid valve stem 8 to move downward. The sealing plug 12 fits the air inlet hole 22 in the air inlet valve seat 20, and the air inlet hole 22 is closed. Natural gas can enter the space between the upper rubber membrane 10 and the lower rubber membrane 11 but cannot enter the valve cavity 15a of the valve body 15. At this time, the air pressure between the upper rubber membrane 10 and the lower rubber membrane 11 is higher than the air pressure in the valve chamber 15a, and the sealing plug 12 is subjected to a downward pressure difference. Even if the solenoid valve stops supplying power, the air inlet 22 can self-lock; when the first-level electromagnetic coil component 7 passes the opposite current, the first-level electromagnetic coil component 7 is subjected to an upward electromagnetic force, and the electromagnetic force is greater than the upper and lower pressure difference between the upper rubber membrane 10 and the lower rubber membrane 11. The first-level electromagnetic coil component 7 drives the first-level electromagnetic valve stem 8 and the sealing plug 12 to move upward, and the air inlet 22 is reopened.

[0037] A pressure sensor 26 is installed in the valve chamber 15a. The structure of the valve chamber 15a slows down the airflow there, ensuring accurate pressure measurement. The measurement data is transmitted to the circuit board component 3, which controls the current flowing through the first-level solenoid valve 1, thereby controlling the opening and closing of the first-level solenoid valve 1. When the pressure is too high, the opening of the first-level solenoid valve 1 decreases, the natural gas entering the valve chamber 15a decreases, and the pressure in the valve chamber 15a decreases accordingly; when the pressure is too low, the opening of the first-level solenoid valve 1 increases, the natural gas entering the valve chamber 15a increases, and the pressure in the valve chamber 15a increases. The circuit board component 3 and the pressure sensor 26 keep the air pressure in the valve chamber 15a stable.

[0038] When the current of the secondary solenoid valve 4 is 0, the secondary solenoid coil component 19 and the secondary solenoid valve stem 17 connected thereto are in the initial position, and the secondary solenoid valve 4 is in the maximum open state at this time; when the secondary solenoid coil component 19 is energized, the secondary solenoid coil component 19 drives the secondary solenoid valve stem 17 to move inward, and the greater the current, the greater the displacement of the secondary solenoid valve stem 17, and the smaller the opening of the air outlet 13a. When the current is maximum, the sealing cone surface of the secondary valve plug 25 is sealed with the air outlet 13a, and the air outlet 13a is completely closed.

[0039] The magnetic field displacement sensor on the circuit board component 3 can detect the position of the magnet that moves with the valve stem 17 of the secondary solenoid valve, and then calculate the outlet flow area of ​​the outlet hole 13a. The primary solenoid valve 1 controls the valve cavity 15a to maintain a stable pressure, so there is a stable pressure difference inside and outside the valve cavity 15a. From the knowledge of fluid mechanics, it can be known that the natural gas outlet flow rate is proportional to the flow area of ​​the secondary solenoid valve 4. By controlling the displacement of the secondary solenoid valve 4 by current, the flow rate of the natural gas flow control valve can be accurately controlled.

Claims

1. A natural gas flow control valve, characterized in that: The invention comprises a valve body component, a first-level solenoid valve, a second-level solenoid valve and a circuit board component; the valve body component comprises a valve body, a valve cavity, a second-level solenoid valve mounting cavity and an inlet valve seat and an outlet valve seat are arranged in the valve body, a first-level solenoid valve mounting hole and an inlet hole are arranged in the inlet valve seat, and an outlet hole is arranged in the outlet valve seat; the first-level solenoid valve is vertically mounted on the first-level solenoid valve mounting hole of the inlet valve seat and controls the opening and closing of the inlet hole, and the natural gas entering from the inlet hole enters the first-level solenoid valve and the valve cavity and controls the pressure in the valve cavity; the second-level solenoid valve is obliquely mounted on the valve body and controls the opening and closing of the outlet hole, thereby accurately controlling the outflowing natural gas flow; the circuit board component is mounted on the valve body; a pressure sensor is arranged in the valve cavity, and the pressure sensor is connected to the circuit board component by signal to measure the pressure in the valve cavity, and then the opening of the first-level solenoid valve is controlled by the circuit board component, so as to control the gas pressure in the valve cavity.

2. A natural gas flow control valve according to claim 1, characterized in that: The first-level solenoid valve is installed in the first-level solenoid valve installation hole through the first-level solenoid valve cover and fasteners.

3. A natural gas flow control valve according to claim 2, characterized in that: The primary solenoid valve comprises: A primary permanent magnet installed in the primary solenoid valve installation hole; A primary electromagnetic coil component installed in the primary permanent magnet; A primary spring sheet mounted on top of the primary permanent magnet via a fastener; A primary solenoid valve stem longitudinally passes through the primary solenoid coil component, the top of the primary solenoid valve stem is connected to the primary spring sheet and is equipped with a primary piston; An upper rubber membrane, a lower rubber membrane and a sealing plug are sequentially installed on the first-level solenoid valve stem from top to bottom and longitudinally pass through the bottom of the first-level solenoid coil component. After the sealing plug opens the air inlet, the gas entering the air inlet enters the valve cavity and the space between the upper rubber membrane and the lower rubber membrane.

4. A natural gas flow control valve according to claim 1, characterized in that: The secondary solenoid valve is installed in the secondary solenoid valve installation cavity through a secondary solenoid valve cover.

5. A natural gas flow control valve according to claim 4, characterized in that: The secondary solenoid valve comprises: A secondary permanent magnet installed in the secondary solenoid valve installation cavity; A secondary electromagnetic coil component installed in the secondary permanent magnet; A secondary spring sheet mounted on top of the secondary permanent magnet via a fastener; A secondary solenoid valve stem longitudinally passes through the secondary solenoid coil component, the top of which is connected to the secondary spring sheet and is equipped with a secondary piston; the secondary solenoid valve stem longitudinally passes through the bottom of the primary solenoid coil component and is equipped with a secondary valve plug, which is used to open and close the air outlet.

6. A natural gas flow control valve according to any one of claims 1 to 5, characterized in that: An air outlet joint is also provided on the valve body, and the inner hole of the air outlet joint is communicated with the air outlet hole.

7. A natural gas flow control valve according to claim 5, characterized in that: A magnet is installed on the valve stem of the secondary solenoid valve, and a secondary magnetic field displacement sensor is arranged on the circuit board component. The secondary magnetic field displacement sensor is used to detect the position of the magnet following the movement of the valve stem of the secondary solenoid valve.

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