Gas metering valve and its valve plate structure

Abstract

This invention discloses a gas metering valve and its valve plate structure. The valve plate structure includes an upper valve plate with a vent hole and a lower valve plate with a metering hole. The upper and lower valve plates are configured in the flow channel of the valve body to control the opening and closing of the flow channel. The upper valve plate, as an independent moving part, is configured as a plate-like structure and has a magnetization function. Based on the magnetic force provided by the driving component, the upper and lower valve plates quickly separate to open the flow channel. Based on the mechanical support force provided by the driving component, the upper valve plate quickly returns to its original position and engages with the lower valve plate to close the flow channel. Applying this valve plate structure to a gas metering valve helps improve the stability and reliability of the metering valve and enhances the accuracy of gas metering.

Description

Technical Field

[0001] This invention relates to the field of metering valve technology, and more specifically, to a gas metering valve and its valve plate structure. Background Technology

[0002] Gas metering valves differ from liquid metering valves. In liquid metering valves, the flowing liquid provides self-lubrication to the valve plug and seat. Friction and sealing issues arising from the valve plug's movement can be overcome by the liquid's self-lubrication and viscosity. Therefore, the structural designs of gas and liquid metering valves differ significantly, making them incompatible. While existing gas metering valves improve sealing by incorporating rubber surfaces on the valve plug and seat contact surfaces, or by strictly controlling the roughness of the lower valve plug and upper valve seat surfaces, they still suffer from the following shortcomings: 1. Their moving parts, including the valve plug, armature, and moving valve core, have a long contact area with the internal flow channel, increasing resistance, response time, and wear, affecting accurate metering and stability; 2. The sealing structure between the valve plug and seat is frequently impacted and compressed, easily deforming and losing its sealing effect; 3. They cannot meet the needs of batch production metering valves for different equipment requiring varying flow rates.

[0003] To address the shortcomings of existing gas metering valves, there is an urgent need to design a gas metering valve that meets market application requirements for accurate, stable, and reliable metering. Summary of the Invention

[0004] One object of the present invention is to solve at least the above-mentioned problems and to provide at least the advantages that will be described later.

[0005] Another objective of this invention is to provide a valve plate structure in which the upper valve plate is set as a plate-like structure and constituted as an independent moving body in the valve body. This reduces frictional losses with the flow channel and reduces impact damage, thereby improving the stability and reliability of the metering valve. It also improves the motion response time of the valve plate moving body, allowing the upper and lower valve plates to quickly separate and return to their original positions, which helps to improve the accuracy of metering.

[0006] This invention provides a gas metering valve that utilizes the above-described valve plate structure. By leveraging the advantages of the valve plate structure, the stability and reliability of the gas metering valve and the accuracy of gas metering are improved.

[0007] In order to achieve these objectives and other advantages according to the present invention, a valve plate structure is provided, comprising an upper valve plate having a vent hole and a lower valve plate having a metering hole, the upper valve plate and the lower valve plate being configured in a flow channel of a valve body for controlling the opening and closing of the flow channel;

[0008] The upper valve plate is configured as an independent moving body with a sheet-like structure and has the function of being magnetized. Based on the magnetic force provided by the driving component, the upper valve plate and the lower valve plate quickly separate to achieve unobstructed flow. Based on the mechanical support force provided by the driving component, the upper valve plate is pushed to quickly return to its original position and fit with the lower valve plate to complete the closure of the flow channel.

[0009] Preferably, the upper valve plate is designed to be magnetized in such a way that part or all of the upper valve plate is made of soft magnetic material.

[0010] Preferably, the driving component that provides magnetic force is the first driving component, and the driving component that provides mechanical support force is the second driving component. The upper end of the shaft of the upper valve plate is provided with a groove for the second driving component to abut.

[0011] Preferably, a sealing sheet is provided on the lower end face of the upper valve plate to press against the sealing platform on the upper end face of the lower valve plate to form a sealing surface to seal the metering orifice; a limiting block is provided on the upper end face of the lower valve plate, the height of the limiting block being slightly lower than the sealing platform, to abut against the non-sealing sheet area on the lower end face of the upper valve plate.

[0012] Preferably, the limiting block is a circular protrusion, which is set on the outer ring coaxial with the sealing platform.

[0013] Preferably, the edges of the upper valve plate are rounded or chamfered.

[0014] The present invention also provides a gas metering valve, which adopts the above-mentioned valve plate structure as a valve assembly, and further includes a first driving component that provides an upward magnetic force to the upper valve plate, a second driving component that provides a return force to the upper valve plate, and a housing.

[0015] Preferably, it also includes a magnetic sleeve located inside the housing. The magnetic sleeve has a cavity structure, and the upper end of the magnetic sleeve is integrally sealed or can be detachably sealed through a magnetic cover. The first driving component, the second driving component, and the valve plate structure are disposed in the cavity of the magnetic sleeve. A limiting part is provided in the lower cavity of the magnetic sleeve. The limiting part and the lower valve plate of the valve plate structure form a moving space for the upper valve plate. Under the action of the first driving part and the second driving component, the upper valve plate can move up and down between the limiting part and the lower valve plate to control the opening and closing of the metering orifice of the lower valve plate.

[0016] Preferably, a lift adjustment ring is also provided in the lower cavity of the magnetic sleeve, which is located between the limiting part and the upper valve plate, and the sum of the flow rates of all metering holes is greater than the flow rate of the maximum stroke gap of the upper valve plate, for adjusting the maximum lift of the upper valve plate and protecting the upper valve plate and the limiting part.

[0017] Preferably, the cavity at the lower end of the magnetic sleeve also includes a magnetic shielding ring, and the upper valve plate is slidably fitted inside the magnetic shielding ring.

[0018] The present invention has at least the following beneficial effects:

[0019] I. This invention reduces frictional losses within the flow channel and minimizes impact damage by configuring the upper valve plate as a sheet-like structure within the valve body. This improves the stability and reliability of the metering valve and increases the response time of the moving valve plate, allowing the upper and lower valve plates to separate and return quickly, thus enhancing the accuracy of the metering valve. Specifically, it is applicable to natural gas engine systems, enabling precise metering of the gas injection quantity, ensuring the engine operates at the optimal air-fuel ratio, and meeting energy conservation and emission reduction requirements.

[0020] Second, the present invention has a groove at the upper end of the axis of the upper valve plate to prevent the support force of the second driving component on the upper valve plate from shifting.

[0021] Third, the edges of the upper valve plate of the present invention are rounded or chamfered to make the upper valve plate rise and fall more smoothly, further enabling the upper valve plate and the lower valve plate to separate and return to their original positions quickly, reducing the impact with the inner flow channel or the magnetic shielding ring, and further reducing the contact area with the inner flow channel or the magnetic shielding ring.

[0022] Fourth, the limiting block provided in this invention can prevent excessive impact and compression between the sealing plate of the upper valve plate and the sealing platform of the lower valve plate, thereby extending the service life of the sealing plate and improving the stability and reliability of the gas metering valve. For example, the limiting block is a circular protrusion, set on the outer ring coaxial with the sealing platform.

[0023] V. This invention incorporates a lift adjustment ring within the lower cavity of the magnetic sleeve to alter the maximum stroke of the upper valve plate, facilitating changes in flow range for batch production. Simultaneously, it protects the upper valve plate and the limiting portion of the magnetic sleeve from damage caused by movement and impact, preventing inaccurate metering. The snap-fit ​​connection facilitates replacement and adjustment of the product flow range.

[0024] VI. This invention improves the metering accuracy and reliability of the metering valve by improving sealing, response speed and friction loss, which is more conducive to meeting the speed requirements of high-frequency engines.

[0025] Other advantages, objectives and features of the present invention will become apparent in part from the following description, and in part from those skilled in the art through study and practice of the invention. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of one implementation of the gas metering valve of the present invention;

[0027] Figure 2This is an enlarged schematic diagram of the upper and lower valve plates of the gas metering valve of the present invention arranged in the flow channel;

[0028] Figure 3 This is an enlarged schematic diagram of the valve plate structure of the present invention;

[0029] Figure 4 for Figure 3 A top-view structural diagram;

[0030] Figure 5 This is an enlarged schematic diagram of the lower valve plate structure of the present invention;

[0031] Figure 6 for Figure 5 A top-view structural diagram.

[0032] In the diagram: 1. Magnet core; 2. Magnetic cover; 3. Spring pin; 4. Magnetic sleeve; 5. Coil assembly; 6. Lift adjustment ring; 7. Magnetic isolation ring; 8. Upper valve plate; 9. Lower valve plate; 10. Air guide pipe; 11. Sealing plate; 12. Limiting part; 13. Filter screen; 14. Second O-ring; 15. Return spring; 16. First O-ring; 17. Housing; 71. Limiting block; 72. Metering hole; 73. Sealing platform; 81. Vent hole; 82. Sink. Detailed Implementation

[0033] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0034] It should be noted that in the description of this invention, the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. It does 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 invention.

[0035] like Figure 3-6 One implementation of the valve plate structure is shown, and combined with Figure 1-2 The gas metering valve shown illustrates the valve plate structure, which includes an upper valve plate 8 with a vent 81 and a lower valve plate 9 with a metering orifice 72. The upper valve plate 8 and the lower valve plate 9 are arranged in the flow channel of the valve body to control the opening and closing of the flow channel.

[0036] The upper valve plate 8 is configured as an independent moving body with a sheet-like structure and has the function of being magnetized. Based on the magnetic force provided by the driving component, the upper valve plate 8 and the lower valve plate 9 quickly separate to achieve unobstructed flow. Based on the mechanical support force provided by the driving component, the upper valve plate 8 is pushed to quickly return to its original position and fit with the lower valve plate 9 to complete the closure of the flow channel.

[0037] The valve plate structure of the present invention is disposed in the flow channel of the gas metering valve body to control the opening and closing of the flow channel, such as... Figure 1-2 The valve body contains a driving component that provides magnetic force, such as an electromagnetic circuit assembly. A driving component, such as a return spring 15, is inserted through the center of the electromagnetic circuit assembly to provide mechanical support and push the upper valve plate 8 back to its original position quickly. Both the electromagnetic circuit assembly and the return spring 15 are positioned above the upper valve plate 8, with the lower end of the return spring 15 pressing against the upper end face of the upper valve plate 8. The vent 81 of the upper valve plate 8 is connected to the air inlet of the valve body flow channel, and the metering hole 72 of the lower valve plate 9 is connected to the air outlet of the valve body. When the magnetic circuit is energized, the upper valve plate 8 is magnetized and moves upward, separating from the lower valve plate 9. The vent 81 of the upper valve plate 8 connects with the metering hole 72 of the lower valve plate 9, opening the flow channel of the valve body. When the magnetic circuit is de-energized, the upper valve plate 8 is demagnetized and, under the action of the return spring 15, moves downward back to its original position. The upper valve plate 8 presses against the lower valve plate 9, forming a sealing surface between the lower end face of the upper valve plate 8 and the upper end face of the lower valve plate 9, closing the flow channel of the valve body.

[0038] Analysis of the working principle of the valve plate structure of the present invention within the valve body reveals that the upper valve plate 8 is designed as a sheet-like structure with magnetization capabilities. As an independent moving body, this sheet-like structure can be very thin, such as 10-50 μm or even thinner. Therefore, when the upper valve plate 8 moves up and down as an independent moving body, the contact area with the inner flow channel is very small, reducing frictional losses and improving the stability and reliability of the metering valve. Furthermore, the independent moving body of the upper valve plate 8 is designed as a sheet-like structure to reduce mass. On the one hand, this reduces impact damage and helps improve the stability and reliability of the metering valve; on the other hand, it increases the motion acceleration and response speed, which helps improve the accuracy of the metering valve.

[0039] Therefore, the idea of ​​setting the moving valve plate as a plate-like structure or thinning it and constructing it as an independent moving body in the valve body to improve the stability, reliability and accurate measurement of the metering valve is within the scope of protection of this invention.

[0040] Furthermore, the upper valve plate 8 is designed to be magnetized by being partially or entirely made of soft magnetic material. For example, the upper surface of the upper valve plate 8 may be uniformly made of soft magnetic material, or the middle of the upper valve plate 8 may be uniformly made of soft magnetic material, or the entire upper valve plate 8 may be uniformly made of soft magnetic material. This design facilitates the upper valve plate 8 to receive a uniformly distributed magnetic attraction force after magnetization, thus preventing the upper valve plate 8 from tilting.

[0041] Furthermore, the driving component providing magnetic force is designated as the first driving component, and the driving component providing mechanical support force is designated as the second driving component. The upper end of the upper valve plate 8 has a recess 82 for the second driving component to abut against. This recess is used by the second driving component to push and support the upper valve plate 8 against the lower valve plate 9 to close the flow channel. For example, the lower end of the return spring 15 is placed within the recess 82 to prevent the supporting force of the return spring 15 on the upper valve plate 8 from shifting.

[0042] Based on the above implementation, a sealing plate 11 is provided on the lower end face of the upper valve plate 8, which is used to press against the sealing platform 73 on the upper end face of the lower valve plate 9 to form a sealing surface to seal the metering hole 72. For example, an installation groove is provided at the lower end of the shaft of the upper valve plate 8, and the sealing plate 11 is integrally formed in the installation groove. In order to improve the sealing performance of the sealing surface formed by the lower end face of the upper valve plate 8 and the sealing platform 73 on the upper end face of the lower valve plate 9, a coaxial first sealing ring and a second sealing ring are provided sequentially from the outside to the inside of the sealing platform 73. Both the first sealing ring and the second sealing ring are circular protrusions. There are multiple metering holes 72, all of which are located between the first sealing ring and the second sealing ring.

[0043] Based on the above implementation, the edges of the upper valve plate 8 are rounded or chamfered. The rounded or chamfered edges of the upper valve plate 8 in this invention make the rising and falling of the upper valve plate 8 smoother, reduce the impact with the inner flow channel or the magnetic shielding ring 7, and further reduce the contact area with the inner flow channel or the magnetic shielding ring 7.

[0044] Based on the above implementation, a limiting block 71 is provided on the upper end face of the lower valve plate 9. The height of the limiting block 71 is slightly lower than that of the sealing platform 73, and it is used to abut against the non-sealing plate 11 area of ​​the lower end face of the upper valve plate 8. The limiting block 71 provided in this invention can prevent excessive impact and compression between the sealing plate 11 of the upper valve plate 8 and the sealing platform 73 of the lower valve plate 9, extend the service life of the sealing plate 11, and improve the stability and reliability of the gas metering valve. For example, the limiting block 71 is a circular protrusion, which is provided on the outer ring coaxial with the sealing platform 73.

[0045] like Figure 1-2 One implementation of a gas metering valve is shown, and combined with... Figure 3-6 The valve plate structure shown is described below. The gas metering valve includes a first drive component that uses the above-described valve plate structure as a valve assembly, provides an upward magnetic force to the upper valve plate 8, a second drive component that provides a return force to the upper valve plate 8, and a housing 17.

[0046] Based on the above implementation, a magnetic sleeve 4 is also included, located inside the housing 17. The magnetic sleeve 4 has a cavity structure, and its upper end is either integrally sealed or detachably sealed via a magnetic cover 2. The first driving component, the second driving component, and the valve plate structure are disposed within the cavity of the magnetic sleeve 4. A limiting part 12 is provided in the lower cavity of the magnetic sleeve 4. The limiting part 12 and the lower valve plate 9 of the valve plate structure form a moving space for the upper valve plate 8. The upper valve plate 8 is disposed within the space formed by the limiting part 12 and the lower valve plate 9. Under the action of the first driving part and the second driving component, the upper valve plate 8 is specifically designed to be attached... Figure 1In the structure described, the upper valve plate 8, under the action of magnetic force and the elastic force of the return spring 15, can move up and down between the limiting part 12 and the lower valve plate 9 to control the opening and closing of the metering orifice 72 of the lower valve plate 9. This achieves control over the flow path of the gas metering valve. Under the process setting of the maximum flow rate of the upper valve plate 8 and the lower valve plate 9, the upper valve plate 8, being a sheet-like structure and acting as an independent moving body, reduces the mass of the moving body and frictional loss, improves the response speed, and achieves accurate metering of the gas flow rate during the opening period of the upper valve plate 8 and the lower valve plate 9.

[0047] Figure 1 The first driving component includes a magnet core 1 and a coil assembly 5; the second driving component includes a spring pin 3 and a return spring 15; the magnetic cover 2 is assembled on the upper end of the cavity of the magnetic sleeve 4, and the magnetic cover 2 and the magnetic sleeve 4 are located inside the housing 17. The magnet core 1 is located in the middle channel between the magnetic cover 2 and the magnetic sleeve 4. The spring pin 3 is pressed into the axial channel inside the magnet core 1. The return spring 15 is arranged between the spring pin 3 and the upper valve plate 8. The groove 82 of the return spring 15 is used to place the lower end of the return spring 15. The coil assembly 5 is located on the outer circumferential surface of the magnet core 1. The upper end of the coil assembly 5 is sealed with the magnetic cover 2 and the magnet core 1 by a first O-ring 16. The lower end of the coil assembly 5 is sealed with the magnetic sleeve 4 by a second O-ring 14. The valve plate structure is confined in the cavity at the lower end of the magnetic sleeve 4. Figure 1 The cavity structure of the magnetic sleeve 4 shown is a cylindrical cavity at the upper end, and the space for the valve plate structure is also a cylindrical cavity. A communicating vent is provided at the lower end of the magnetic sleeve 4 and the lower end of the magnet core 1. The vent at the lower end of the magnetic sleeve 4 serves as the air inlet for the gas metering valve, and then passes through the vent at the lower end of the magnet core 1 to reach the moving space of the upper valve plate 8. Alternatively, the vent at the lower end of the magnetic sleeve 4 directly reaches the moving space of the upper valve plate 8, connecting the air inlet of the flow channel with the vent hole 81 of the upper valve plate 8. Multiple vent holes 81 can be provided on the upper valve plate 8 body and shaft for communication with the flow channel.

[0048] Based on the above implementation, a lift adjustment ring 6 is also provided in the lower cavity of the magnetic sleeve 4. It is located between the limiting part 12 and the upper valve plate 8, and the sum of the flow rates of all the metering holes 72 is greater than the flow rate of the maximum stroke gap of the upper valve plate 8. It is used to adjust the maximum lift of the upper valve plate 8 and to protect the upper valve plate 8 and the limiting part 12. The lift adjustment ring 6 can be fixed or snapped onto the limiting part 12. Figure 1 and 2 The upper valve plate 8 and lower valve plate 9 are shown in contact, in a closed valve body flow channel state. At this time, there is a gap between the upper valve plate 8 and the lift adjustment ring 6, allowing the upper valve plate 8 to move upward. Due to the small gap, Figure 1 and 2The fact that it is not shown in the diagram does not mean that the gap does not exist. This invention includes a lift adjustment ring 6 in the lower cavity of the magnetic sleeve 4 to change the maximum stroke of the upper valve plate 8, which is beneficial for changing the flow range in batch products.

[0049] For example, the gas metering valve of this invention, without requiring changes to other components, only needs to replace the lift adjustment ring 6 with one of different thicknesses. This changes the maximum stroke of the lower valve plate 9 against the lift adjustment ring 6, thereby altering the lift of the upper valve plate 8 and thus the flow rate through the maximum stroke gap of the upper valve plate 8. Within the same metering time, different output flow rates can be metered to meet the needs of different products. The principle is as follows: when the gas flows for the same amount of time, the maximum stroke of the upper valve plate 8 determines the flow rate. Under the condition that the sum of the maximum flow rates of all metering orifices 72 is greater than the flow rate through the maximum stroke gap of the upper valve plate 8, the upper valve plate 8 and the lower valve plate 9 are opened for a specified period of time. Under the same pressure and temperature, the larger the maximum stroke gap of the upper valve plate 8, the greater the flow rate.

[0050] Simultaneously, it protects the upper valve plate 8 and the limiting part 12 of the magnetic sleeve 4, preventing damage to the upper valve plate 8 and the limiting part 12 from movement impacts, thus avoiding problems such as inaccurate metering. The snap-fit ​​connection facilitates replacement and changes in the product flow range.

[0051] Based on the above implementation, the cavity at the lower end of the magnetic sleeve 4 also includes a magnetic shielding ring 7, and the upper valve plate 8 is slidably fitted inside the magnetic shielding ring 7. The lower end of the cavity of the magnetic sleeve 4 is also connected to a gas guide pipe 10, which is used to discharge the gas from the metering hole 72 of the lower valve plate 9. The gas metering valve's flow channel inlet is equipped with a filter screen 13.

[0052] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A gas metering valve, characterized in that, The valve assembly includes a valve plate structure, which comprises an upper valve plate with a vent hole and a lower valve plate with a metering hole. The upper and lower valve plates are configured in the flow channel of the valve body to control the opening and closing of the flow channel. The upper valve plate is configured as an independent moving body with a sheet-like structure and has the function of being magnetized. Based on the magnetic force provided by the driving component, the upper valve plate and the lower valve plate quickly separate to achieve unobstructed flow; based on the mechanical support force provided by the driving component, the upper valve plate is pushed to quickly return to its original position and fit with the lower valve plate to complete the closure of the flow channel. The upper valve plate is designed to be magnetized in such a way that part or all of the upper valve plate is made of soft magnetic material. The driving component that provides magnetic force is the first driving component, and the driving component that provides mechanical support force is the second driving component. The upper end of the shaft of the upper valve plate is provided with a groove for the second driving component to abut. A sealing plate is provided on the lower end face of the upper valve plate to press against the sealing platform on the upper end face of the lower valve plate to form a sealing surface to seal the metering orifice; a limiting block is provided on the upper end face of the lower valve plate, the height of the limiting block being slightly lower than the sealing platform, to abut against the non-sealing plate area on the lower end face of the upper valve plate. The limiting block is a circular protrusion, which is set on the outer ring coaxial with the sealing platform; The sealing platform is provided with a first sealing ring and a second sealing ring arranged in a coaxial manner from the outside to the inside. Both the first sealing ring and the second sealing ring are circular protrusions. The metering holes are all located between the first sealing ring and the second sealing ring. The edges of the upper valve plate are rounded or chamfered; It also includes a magnetic sleeve, and the cavity at the lower end of the magnetic sleeve also includes a magnetic shielding ring, and the upper valve plate is slidably fitted inside the magnetic shielding ring; It also includes a first drive component that provides an upward magnetic force to the upper valve plate, a second drive component that provides a return function to the upper valve plate, and a housing; The magnetic sleeve is located inside the housing. The magnetic sleeve has a cavity structure. The upper end of the magnetic sleeve is integrally sealed or can be detachably sealed through a magnetic cover. The first driving component, the second driving component, and the valve plate structure are arranged in the cavity of the magnetic sleeve. A limiting part is provided in the lower cavity of the magnetic sleeve. The limiting part and the lower valve plate of the valve plate structure form a moving space for the upper valve plate. Under the action of the first driving part and the second driving component, the upper valve plate can move up and down between the limiting part and the lower valve plate to control the opening and closing of the metering orifice of the lower valve plate. The lower cavity of the magnetic sleeve is also provided with a lift adjustment ring, which is located between the limiting part and the upper valve plate. The sum of the flow rates of all the metering holes is greater than the flow rate of the maximum stroke gap of the upper valve plate. It is used to adjust the maximum lift of the upper valve plate and to protect the upper valve plate and the limiting part.

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