An oil-gas balance valve assembly

Abstract

This application relates to an oil-gas balance valve assembly, belonging to the field of dual-fuel control technology. It includes: a valve body with an interconnected inlet and outlet channel, and a valve core connected within the valve body for adjusting the flow area between the inlet and outlet channels; an upper valve cover sealed to the valve body, forming a chamber with the valve body, and a diaphragm dividing the chamber into an upper and lower diaphragm chamber; one end of the valve core extending into the lower diaphragm chamber; and an inlet on the upper valve cover for injecting liquid fuel into the upper diaphragm chamber. The diaphragm reciprocates according to the pressure of the liquid fuel in the upper diaphragm chamber. The diaphragm of this application can expand and contract according to the pressure change of the liquid fuel in the upper diaphragm chamber, thereby pushing the valve core to reciprocate and adjusting the flow area between the inlet and outlet channels. This achieves automatic adjustment of the gaseous fuel intake flow based on the pressure of the liquid fuel, solving the problem of large fluctuations in natural gas pressure control.

Description

Technical Field

[0001] This application relates to the field of fuel injection control technology for dual-fuel engines, and in particular to an oil-gas balance valve assembly. Background Technology

[0002] Internal combustion engines have been developed to operate efficiently on clean fuels such as natural gas or other combustible gas fuels such as methane, propane, butane, hydrogen, and blends of such fuels, thereby reducing the level of pollutants in engine exhaust.

[0003] A dual-fuel direct injection technology, employing compression ignition, effectively improves combustion efficiency. This technology first injects a small amount of diesel fuel into the combustion chamber, which, after compression ignition, raises the temperature within the combustion chamber, igniting the subsequently injected natural gas for combustion and power generation. This technology can increase combustion efficiency to over 42% while significantly reducing PM and NOx emissions, resulting in a cleaner and more economical internal combustion engine fuel injection system.

[0004] In the aforementioned dual-fuel direct injection system, the pressure difference between natural gas and diesel fuel needs to be precisely and rapidly controlled. Therefore, the system requires a self-balancing pressure regulating valve to control the gaseous fuel pressure. Currently, there are no mature pressure regulating valve products on the market. Most products use a plunger-type structure, which is difficult to manufacture, has high frictional resistance, and is prone to wear. Furthermore, the gaseous fuel pressure does not follow the diesel pressure well, and the pressure difference is unstable. The performance and reliability of existing products cannot meet the requirements of a dual-fuel system. Summary of the Invention

[0005] This application provides an oil-gas balance valve assembly to solve the problems in related technologies where pressure regulating valves use a plunger structure, which is difficult to process, has high frictional resistance, is prone to wear, has poor tracking of gas fuel pressure to diesel pressure, and has unstable pressure differential.

[0006] This application provides an oil-gas balance valve assembly, including:

[0007] The valve body has an inlet channel and an outlet channel that are interconnected. A valve core for adjusting the flow area between the inlet channel and the outlet channel is also connected to the valve body.

[0008] The upper valve cover is sealed to the valve body and together with the valve body forms a chamber. The chamber is provided with a diaphragm that divides the chamber into an upper diaphragm chamber and a lower diaphragm chamber.

[0009] One end of the valve core extends into the lower diaphragm chamber, and the upper valve cover has an inlet for injecting liquid fuel into the upper diaphragm chamber. The diaphragm moves the valve core back and forth according to the pressure of the liquid fuel in the upper diaphragm chamber.

[0010] In some embodiments: the diaphragm includes an elastic sheet and a top plate connected to the elastic sheet, the elastic sheet being held between the upper valve cover and the valve body, and the top plate being located at the center of the elastic sheet and abutting against one end of the valve core.

[0011] In some embodiments: the top of the top plate is provided with a screw that passes through the elastic sheet, a pressure plate that clamps the elastic sheet is sleeved on the screw, a locking nut that fixes the pressure plate on the top plate is connected to the screw, and a pressure block that abuts against the valve core is provided at the bottom of the top plate.

[0012] In some embodiments: the valve body has a valve cavity at one end away from the upper valve cover to accommodate the valve core, the valve cavity is connected to the air inlet channel, the air outlet channel and the lower diaphragm cavity, and the valve body has a lower valve cover to close the valve cavity;

[0013] The bottom of the valve core is provided with a spring that drives the valve core to move toward the diaphragm. The end of the spring away from the valve core is provided with a spring seat. The lower valve cover is threaded with an adjusting screw that abuts against the spring seat. The adjusting screw is used to adjust the spring force.

[0014] In some embodiments: the valve core includes a valve stem and a valve seat arranged coaxially, the diameter of the valve seat is larger than the diameter of the valve stem, the valve seat has a countersunk hole for accommodating the spring, the valve stem has a venting channel communicating with the countersunk hole, and the lower valve cover has a gas venting port communicating with the countersunk hole.

[0015] In some embodiments, the valve stem or diaphragm is provided with a sealing gasket for sealing the venting channel. When the valve stem and the diaphragm abut against each other, the sealing gasket seals between the valve stem and the diaphragm. When the valve stem and the diaphragm separate, the sealing gasket opens the venting channel.

[0016] In some embodiments: a conical channel is provided between the air intake channel and the air outlet channel, and a frustum-shaped sealing ring is fitted on the valve core to cooperate with the conical channel. The frustum-shaped sealing ring linearly adjusts the flow area of ​​the conical channel.

[0017] In some embodiments: the valve body is provided with a throttling device, the throttling device is connected to a gas control module, and the gas control module controls the throttling device to operate according to the pumping frequency, so as to adjust the air intake flow of the air intake channel.

[0018] In some embodiments, the throttling device includes a piezoelectric ceramic and a throttling plunger sleeve fixed on the valve core. The throttling plunger sleeve is located at the outlet of the intake channel. The piezoelectric ceramic receives a voltage signal from the gas control module and generates directional linear deformation to drive the throttling plunger sleeve to change the flow area at the outlet of the intake channel.

[0019] In some embodiments: the gas control module is connected to a plunger pump that pumps air into the air intake channel, and when the gas control module sends an air pumping signal to the plunger pump, it sends a control signal to the throttling device in advance or simultaneously.

[0020] The beneficial effects of the technical solution provided in this application include:

[0021] This application provides an oil-gas balance valve assembly. The assembly includes a valve body with interconnected inlet and outlet channels. A valve core is also connected within the valve body to adjust the flow area between the inlet and outlet channels. An upper valve cover is sealed to the valve body and forms a chamber with it. A diaphragm divides the chamber into an upper and lower diaphragm chamber. One end of the valve core extends into the lower diaphragm chamber. An inlet for injecting liquid fuel into the upper diaphragm chamber is provided on the upper valve cover. The diaphragm moves the valve core reciprocally according to the pressure of the liquid fuel in the upper diaphragm chamber.

[0022] Therefore, the oil-gas balance valve assembly of this application has a chamber formed by the upper valve cover and the valve body. A diaphragm is provided within the chamber, dividing it into an upper diaphragm chamber and a lower diaphragm chamber. One end of the valve core located within the valve body extends into the lower diaphragm chamber. An inlet for injecting liquid fuel into the upper diaphragm chamber is provided on the upper valve cover. This inlet is connected to a high-pressure oil rail. The diaphragm can expand and contract according to the pressure changes of the liquid fuel in the upper diaphragm chamber, thereby driving the valve core to reciprocate and adjust the flow area between the intake and outlet channels. This achieves automatic adjustment of the intake flow rate based on the pressure of the liquid fuel.

[0023] This application uses a diaphragm structure instead of a plunger structure to ensure the sealing performance between liquid fuel and gaseous fuel, reduce the frictional resistance of the friction pair, improve the following of gaseous fuel pressure to liquid fuel pressure, enhance the control accuracy of gaseous fuel pressure, and solve the problem of large fluctuations in natural gas pressure control in the market. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the oil-gas balance valve assembly in the intake state according to an embodiment of this application;

[0026] Figure 2 This is a schematic diagram of the oil-gas balance valve assembly in the closed state according to an embodiment of this application;

[0027] Figure 3 This is a schematic diagram of the oil-gas balance valve assembly in the venting state according to an embodiment of this application.

[0028] Figure label:

[0029] 1. Valve body; 2. Inlet passage; 3. Outlet passage; 4. Valve core; 5. Upper valve cover; 6. Diaphragm; 7. Upper diaphragm chamber; 8. Lower diaphragm chamber; 9. Liquid inlet; 10. Valve chamber; 11. Elastic plate; 12. Top plate; 13. Pressure plate; 14. Locking nut; 15. Screw; 16. Pressure block; 17. Sealing gasket; 18. Valve seat; 19. Valve stem; 20. Countersunk hole; 21. Exhaust passage; 22. Lower valve cover; 23. Spring; 24. Spring seat; 25. Adjusting screw; 26. Frustum-shaped sealing ring; 27. Gas exhaust port; 28. Piezoelectric ceramic; 29. ​​Throttling plunger sleeve. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0031] This application provides an oil-gas balance valve assembly that solves the problems in related technologies where pressure regulating valves use a plunger structure, which is difficult to process, has high frictional resistance, is prone to wear, has poor tracking of gas fuel pressure to diesel pressure, and has unstable pressure differential.

[0032] See Figures 1 to 3 As shown in the figure, this application provides an oil-gas balance valve assembly, including:

[0033] The valve body 1 has an interconnected air inlet channel 2 and an air outlet channel 3. The air inlet channel 2 is located on the left side of the valve body 1, and the air outlet channel 3 is located on the right side of the valve body 1. Gaseous fuel (e.g., natural gas) entering through the left air inlet channel 2 passes through the valve body 1 and exits through the right air outlet channel 3. A valve core 4 is also connected inside the valve body 1 to adjust the flow area between the air inlet channel 2 and the air outlet channel 3. The valve core 4 can reciprocate within the valve body 1, thereby regulating the flow rate of the gaseous fuel. A filter for filtering impurities in the gaseous fuel is installed in the air inlet channel 2.

[0034] The upper valve cover 5 is sealed to the valve body 1 and together with the valve body 1 forms a chamber. A diaphragm 6 is provided within the chamber, dividing it into an upper diaphragm chamber 7 and a lower diaphragm chamber 8. The upper diaphragm chamber 7 and the lower diaphragm chamber 8 are sealed to each other and do not communicate with each other due to the separation effect of the diaphragm 6. The volume of the upper diaphragm chamber 7 and the lower diaphragm chamber 8 can change according to the elastic expansion and contraction deformation of the diaphragm 6. When the diaphragm moves towards the upper valve cover 5, the volume of the upper diaphragm chamber 7 decreases, and the corresponding volume of the lower diaphragm chamber 8 increases. When the diaphragm moves towards the upper valve body 1, the volume of the upper diaphragm chamber 7 increases, and the corresponding volume of the lower diaphragm chamber 8 decreases.

[0035] The valve core is located within the valve body 1, with one end extending into the lower diaphragm chamber 8. An inlet 9 is provided on the upper valve cover 5 for injecting liquid fuel into the upper diaphragm chamber 7. The inlet 9 is connected to the high-pressure fuel rail via a pipeline, allowing liquid fuel (e.g., diesel) from the high-pressure fuel rail to enter the upper diaphragm chamber 7 through the inlet 9. The liquid fuel in the upper diaphragm chamber 7 alters the elastic deformation of the diaphragm 6 according to the pressure of the liquid fuel in the high-pressure fuel rail. The diaphragm 6, in turn, drives the valve core 4 to reciprocate according to the pressure of the liquid fuel in the upper diaphragm chamber 7. The greater the pressure of the liquid fuel in the upper diaphragm chamber 7, the greater the deformation of the diaphragm 6 towards the valve body 1, thereby increasing the flow area between the intake channel 2 and the outlet channel 3 controlled by the valve core 4, and increasing the flow rate of gaseous fuel exiting the valve body 1.

[0036] In this embodiment of the oil-gas balance valve assembly, the upper valve cover 5 and the valve body 1 together form a chamber. A diaphragm 6 is provided within the chamber, dividing it into an upper diaphragm chamber 7 and a lower diaphragm chamber 8. One end of the valve core 4, located within the valve body 1, extends into the lower diaphragm chamber 8. An inlet 9 is provided on the upper valve cover 5 for injecting liquid fuel into the upper diaphragm chamber 7. This inlet 9 is connected to a high-pressure oil rail. The diaphragm 6 can expand and contract according to the pressure changes of the liquid fuel in the upper diaphragm chamber 7, thereby pushing the valve core 4 to reciprocate and adjust the flow area between the intake channel 2 and the outlet channel 3, thus achieving automatic adjustment of the intake flow rate based on the pressure of the liquid fuel.

[0037] This application uses a diaphragm 6 structure instead of the traditional plunger structure to ensure the sealing performance between liquid fuel and gaseous fuel, reduce the frictional resistance of the friction pair, improve the following of gaseous fuel pressure to liquid fuel pressure, enhance the control accuracy of gaseous fuel pressure, and solve the problem of large fluctuations in natural gas pressure control in the market.

[0038] In some alternative embodiments: see Figures 1 to 3 As shown in the figure, this application embodiment provides an oil-gas balance valve assembly. The diaphragm 6 of the oil-gas balance valve assembly includes an elastic sheet 11 and a top plate 12 connected to the elastic sheet 11. The elastic sheet 11 is clamped between the upper valve cover 5 and the valve body 1 to separate the upper diaphragm chamber 7 and the lower diaphragm chamber 8 from each other and maintain the sealing performance of the upper diaphragm chamber 7 and the lower diaphragm chamber 8. The top plate 12 is located at the center of the elastic sheet 11 and abuts against one end of the valve core 4. The top plate 12 is located at the center of the elastic sheet 11 so that when the elastic sheet 11 undergoes elastic deformation, the top plate 12 can move up and down in the chamber along the axial direction of the valve core 4.

[0039] A screw 15 is provided at the top of the top plate 12, through which an elastic sheet 11 is inserted. The elastic sheet 11 is a disc-shaped rubber structure with a central hole. The screw is located inside the central hole of the elastic sheet 11. A pressure plate 13, which is a disc-shaped steel plate structure with a central hole, is fitted on the screw 15 to hold the elastic sheet 11. A locking nut 14 is connected to the screw 15 to fix the pressure plate 13 to the top plate 12. A pressure block 16 is provided at the bottom of the top plate 12 to abut against the valve core 4. The elastic sheet 11 is clamped between the top plate 12 and the pressure plate 13 and is fastened by the locking nut 14, so that the upper and lower surfaces of the elastic sheet 11 are sealed to the pressure plate 13 and the top plate 12 respectively, sealing the leakage path between the upper membrane cavity 7 and the lower membrane cavity 8 and improving the sealing performance between the upper membrane cavity 7 and the lower membrane cavity 8.

[0040] In some alternative embodiments: see Figures 1 to 3 As shown, this application embodiment provides an oil-gas balance valve assembly. The valve body 1 of this assembly has a valve cavity 10 at the end furthest from the upper valve cover 5, which accommodates the valve core 4. The valve cavity 10 is connected to the air inlet channel 2, the air outlet channel 3, and the lower diaphragm cavity 8. A lower valve cover 22 is provided on the valve body 1 to close the valve cavity 10. A spring 23 is provided at the bottom of the valve core 4 to drive it towards the diaphragm 6. A spring seat 24 is provided at the end of the spring 23 furthest from the valve core 4. An adjusting screw 25 is threaded onto the lower valve cover 22, abutting against the spring seat 24. The adjusting screw 25 is used to adjust the spring force of the spring 23.

[0041] In this embodiment, a spring 23 is provided at the bottom of the valve core 4 to drive the valve core 4 towards the diaphragm 6. When the pressure of the liquid fuel in the upper diaphragm cavity 7 is less than the elastic force of the spring 23, the spring 23 pushes the valve core 4 towards the diaphragm 6, thereby reducing the flow area between the inlet channel 2 and the outlet channel 3. When the pressure of the liquid fuel in the upper diaphragm cavity 7 is greater than the elastic force of the spring 23, the diaphragm 6 pushes the valve core 4 towards the spring 23, thereby increasing the flow area between the inlet channel 2 and the outlet channel 3. An adjusting screw 25 is threaded onto the lower valve cover 22, abutting against the spring seat 24. The preload of the spring 23 can be adjusted by adjusting the adjusting screw 25, thereby changing the liquid fuel in the upper diaphragm cavity 7 to flexibly adjust the flow area between the inlet channel 2 and the outlet channel 3 under the same pressure, reducing the difficulty of gas flow control and lowering process requirements.

[0042] In some alternative embodiments: see Figures 1 to 3 As shown in the embodiment of this application, an oil-gas balance valve assembly is provided. The valve core 4 of the oil-gas balance valve assembly includes a valve stem 19 and a valve seat 18 coaxially arranged, with the diameter of the valve seat 18 being larger than the diameter of the valve stem 19. A countersunk hole 20 for accommodating a spring 23 is provided in the valve seat 18, and a venting channel 21 communicating with the countersunk hole 20 is provided in the valve stem 19. A gas venting port 27 communicating with the countersunk hole 20 is provided on the lower valve cover 22. A sealing gasket 17 for sealing the venting channel 21 is provided on the pressure block 16 of the valve stem 19 or the diaphragm 6. When the valve stem 19 and the diaphragm 6 abut against each other, the sealing gasket 17 seals between the valve stem 19 and the diaphragm 6. When the valve stem 19 and the diaphragm 6 separate, the sealing gasket 17 opens the venting channel 21.

[0043] The valve core 4 in this embodiment includes a valve stem 19 and a valve seat 18 coaxially arranged. A countersunk hole 20 for accommodating a spring 23 is provided in the valve seat 18. A venting channel 21 communicating with the countersunk hole 20 is provided in the valve stem 19. A gas venting port 27 communicating with the countersunk hole 20 is provided on the lower valve cover 22. When the pressure of the liquid fuel in the upper diaphragm chamber 7 decreases to a set pressure value, the elastic force of the spring 23 is greater than the pressure of the liquid fuel in the upper diaphragm chamber 7. Consequently, the spring 23 at the bottom of the valve core 4 drives the valve core 4 to move towards the diaphragm 6, thereby closing the inlet channel 2 and the outlet channel 3.

[0044] When the pressure of the liquid fuel in the upper diaphragm chamber 7 decreases to near zero, the residual gaseous fuel in the lower diaphragm chamber 8 and the outlet passage 3 drives the diaphragm 6 to move toward the upper valve cover 5. As a result, the valve stem 19 separates from the diaphragm 6, and the sealing gasket 17 opens the vent passage 21. The residual gaseous fuel in the lower diaphragm chamber 8 and the outlet passage 3 is discharged to the atmosphere through the vent passage 21, the countersunk hole 20 and the gas vent 27 in sequence.

[0045] In some alternative embodiments: see Figures 1 to 3As shown in the figure, this application embodiment provides an oil-gas balance valve assembly. The assembly has a conical channel that communicates with the intake channel 2 and the outlet channel 3. A frustum-shaped sealing ring 26, which mates with the conical channel, is fitted onto the valve core 4. The frustum-shaped sealing ring 26 is fitted onto the valve stem 19 and abuts against the top of the valve seat 18. The connection between the frustum-shaped sealing ring 26 and the conical channel improves the reliability of the seal and allows for linear adjustment of the flow area of ​​the conical channel. This ensures that the intake channel 2 and the outlet channel 3 change linearly from maximum to minimum opening, improving the stability of fuel gas flow.

[0046] In some alternative embodiments: see Figures 1 to 3 As shown in the figure, this application embodiment provides an oil-gas balance valve assembly. The valve body 1 of this assembly is equipped with a throttling device, which is connected to a gas control module (not shown in the figure). The gas control module controls the throttling device to operate according to the pumping frequency, thereby adjusting the air intake flow rate of the air intake channel 2. The gaseous fuel is supplied by a plunger pump in the LNG cylinder, which reciprocates to expel high-pressure LNG. The gas control module adjusts the pumping frequency of the plunger pump according to the gas consumption. Each pumping operation generates a pressure fluctuation of approximately 18 bar, ensuring that the pressure fluctuation of the gaseous fuel significantly affects the pressure of the liquid fuel.

[0047] In this embodiment, a throttling device is provided inside the valve body 1 to adjust the air intake flow rate of the intake channel 2. This throttling device is connected to the gas control module. When the gas control module controls the pumping frequency of the plunger pump according to the gas consumption, it sends a control signal to the throttling device to reduce the air intake flow rate of the intake channel 2 in advance before the plunger pump pumps air. In other words, the flow area of ​​the intake channel 2 is reduced when the gaseous fuel pressure peak arrives, and the original flow area of ​​the intake channel 2 is restored after the pressure peak passes, thereby solving the problem that large pressure fluctuations of gaseous fuel affect the pressure of liquid fuel.

[0048] Specifically, the throttling device includes a piezoelectric ceramic 28 fixed on the valve core 4 and a throttling plunger sleeve 29. The throttling plunger sleeve 29 is located at the outlet of the intake channel 2. After receiving a voltage signal from the gas control module, the piezoelectric ceramic 28 undergoes directional linear deformation to drive the throttling plunger sleeve 29 to change the flow area at the outlet of the intake channel 2. The gas control module is connected to a plunger pump that pumps air into the intake channel 2. When the gas control module sends an air pumping signal to the plunger pump, it sends a control signal to the piezoelectric ceramic 28 of the throttling device in advance or synchronously.

[0049] Working principle

[0050] This application provides an oil-gas balance valve assembly. The oil-gas balance valve assembly of this application is provided with a valve body 1, which has an inlet channel 2 and an outlet channel 3 that are interconnected. A valve core 4 for adjusting the flow area between the inlet channel 2 and the outlet channel 3 is also connected in the valve body 1. An upper valve cover 5 is sealed to the valve body 1 and forms a chamber together with the valve body 1. A diaphragm 6 is provided in the chamber to divide the chamber into an upper diaphragm chamber 7 and a lower diaphragm chamber 8. One end of the valve core 4 extends into the lower diaphragm chamber 8. An inlet 9 for injecting liquid fuel into the upper diaphragm chamber 7 is provided on the upper valve cover 5. The diaphragm 6 moves the valve core 4 back and forth according to the pressure of the liquid fuel in the upper diaphragm chamber 7.

[0051] Therefore, in the oil-gas balance valve assembly of this application, the upper valve cover 5 and the valve body 1 together form a chamber. A diaphragm 6 is provided within the chamber, dividing it into an upper diaphragm chamber 7 and a lower diaphragm chamber 8. One end of the valve core 4, located within the valve body 1, extends into the lower diaphragm chamber 8. An inlet 9 is provided on the upper valve cover 5 for injecting liquid fuel into the upper diaphragm chamber 7. This inlet 9 is connected to a high-pressure oil rail. The diaphragm 6 can expand and contract according to the pressure changes of the liquid fuel in the upper diaphragm chamber 7, thereby pushing the valve core 4 to reciprocate and adjust the flow area between the intake passage 2 and the outlet passage 3, thus achieving automatic adjustment of the intake flow rate based on the pressure of the liquid fuel.

[0052] This application uses a diaphragm 6 structure instead of a plunger structure to ensure the sealing performance between liquid fuel and gaseous fuel, reduce the frictional resistance of the friction pair, improve the following of gaseous fuel pressure to liquid fuel pressure, enhance the control accuracy of gaseous fuel pressure, and solve the problem of large fluctuations in natural gas pressure control in the market.

[0053] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0054] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0055] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. An oil-gas balance valve assembly, characterized in that, include: The valve body (1) has an inlet channel (2) and an outlet channel (3) that are interconnected. A valve core (4) for adjusting the flow area between the inlet channel (2) and the outlet channel (3) is also connected in the valve body (1). Upper valve cover (5), which is sealed to the valve body (1) and forms a chamber together with the valve body (1). The chamber is provided with a diaphragm (6) that divides the chamber into an upper diaphragm chamber (7) and a lower diaphragm chamber (8). One end of the valve core (4) extends into the lower diaphragm chamber (8), and the upper valve cover (5) is provided with an inlet (9) for injecting liquid fuel into the upper diaphragm chamber (7). The diaphragm (6) moves the valve core (4) back and forth according to the pressure of the liquid fuel in the upper diaphragm chamber (7). The valve body (1) is equipped with a throttling device. The throttling device is connected to a gas control module. The gas control module is connected to a plunger pump that pumps air into the air intake channel (2). When the gas control module sends an air pumping signal to the plunger pump, it sends a control signal to the throttling device in advance or synchronously. The gas control module controls the throttling device to operate according to the air pumping frequency of the plunger pump, so as to adjust the air intake flow rate of the air intake channel (2).

2. The oil-gas balance valve assembly as described in claim 1, characterized in that: The diaphragm (6) includes an elastic sheet (11) and a top plate (12) connected to the elastic sheet (11). The elastic sheet (11) is sandwiched between the upper valve cover (5) and the valve body (1). The top plate (12) is located at the center of the elastic sheet (11) and abuts against one end of the valve core (4).

3. The oil-gas balance valve assembly as described in claim 2, characterized in that: The top of the top plate (12) is provided with a screw (15) that passes through the elastic sheet (11), and a pressure plate (13) that clamps the elastic sheet (11) is sleeved on the screw (15). A locking nut (14) that fixes the pressure plate (13) on the top plate (12) is connected to the screw (15). The bottom of the top plate (12) is provided with a pressure block (16) that abuts against the valve core (4).

4. The oil-gas balance valve assembly as described in claim 1, characterized in that: The valve body (1) has a valve cavity (10) at one end away from the upper valve cover (5) to accommodate the valve core (4). The valve cavity (10) is connected to the air inlet channel (2), the air outlet channel (3) and the lower diaphragm cavity (8). The valve body (1) has a lower valve cover (22) to close the valve cavity (10). The bottom of the valve core (4) is provided with a spring (23) that drives the valve core (4) to move toward the diaphragm (6). The end of the spring (23) away from the valve core (4) is provided with a spring seat (24). The lower valve cover (22) is threaded with an adjusting screw (25) that abuts against the spring seat (24). The adjusting screw (25) is used to adjust the elastic force of the spring (23).

5. The oil-gas balance valve assembly as described in claim 4, characterized in that: The valve core (4) includes a valve stem (19) and a valve seat (18) arranged coaxially. The diameter of the valve seat (18) is larger than the diameter of the valve stem (19). The valve seat (18) has a countersunk hole (20) for accommodating the spring (23). The valve stem (19) has a venting channel (21) communicating with the countersunk hole (20). The lower valve cover (22) has a gas venting port (27) communicating with the countersunk hole (20).

6. The oil-gas balance valve assembly as described in claim 5, characterized in that: The valve stem (19) or diaphragm (6) is provided with a sealing gasket (17) for sealing the venting channel (21). When the valve stem (19) and diaphragm (6) abut against each other, the sealing gasket (17) seals between the valve stem (19) and diaphragm (6). When the valve stem (19) and diaphragm (6) separate from each other, the sealing gasket (17) opens the venting channel (21).

7. The oil-gas balance valve assembly as described in claim 1, characterized in that: A conical channel is provided between the air intake channel (2) and the air outlet channel (3) for mutual communication. A frustum-shaped sealing ring (26) that cooperates with the conical channel is fitted on the valve core (4). The frustum-shaped sealing ring (26) linearly adjusts the flow area of ​​the conical channel.

8. The oil-gas balance valve assembly as described in claim 1, characterized in that: The throttling device includes a piezoelectric ceramic (28) fixed on the valve core (4) and a throttling plunger sleeve (29). The throttling plunger sleeve (29) is located at the outlet of the intake channel (2). The piezoelectric ceramic (28) receives a voltage signal from the gas control module and generates directional linear deformation to drive the throttling plunger sleeve (29) to change the flow area at the outlet of the intake channel (2).

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