Buffer type spring gulp valve and working method thereof

Abstract

The invention discloses a buffer type spring gulp valve and a working method thereof, and relates to the field of gulp valve structures, the buffer type spring gulp valve comprises a shell and a valve element, an air inlet is formed in the top of the shell, an air outlet is formed in the bottom of the shell, and the air inlet and the air outlet are communicated through the interior of the shell; the valve element is located in the shell, and the valve element is fixedly connected with the shell. The valve core is sleeved with a valve cover, the valve cover is a sealed cavity, hydraulic oil is stored in the valve cover, and the valve core penetrates through the top of the valve cover and is in sliding connection with the top of the valve cover. An elastic piece is arranged between the valve cover and the valve core; a valve disc is fixed outside the valve cover and moves along with the valve cover so as to realize the state conversion between the state of closing the air inlet and the state of opening the air inlet by the valve disc; hydraulic oil is stored in the valve cover. Hydraulic oil can be effectively sealed, the leakage risk of the hydraulic oil is remarkably reduced, the service life of the buffer type spring gulp valve is guaranteed, and meanwhile the effect of high response speed is achieved.

Description

Technical Field

[0001] This invention relates to the field of air replenishment valve structure, and in particular to a buffer spring air replenishment valve and its working method. Background Technology

[0002] A spring-loaded air valve is an automatic valve that uses a spring to control its opening and closing. It is mainly used in equipment such as hydroelectric generator sets to perform the important functions of replenishing air during operation and preventing negative pressure or backflow. Its core structure controls the opening and closing of the valve by utilizing the balance between spring force and fluid pressure, thereby opening or closing the air replenishment channel.

[0003] Taking the spring-loaded air valve installed at the top of the central hole of the turbine generator set as an example, it is used to inject air into the tailrace pipe during load adjustment or shutdown of the unit to improve cavitation and vibration conditions. This type of spring-loaded air valve mainly achieves opening and closing through the relative movement of the valve core 31 and the valve cover 2 or valve seat 104. The valve cover 2 is fixed on the valve seat 104. Figure 1 As shown; wherein, the valve core 31 is fixedly connected to the valve disc. When the air replenishment valve is opened to replenish air, the valve disc moves downward together with the valve stem, overcoming the elastic potential energy of the elastic element 4 and opening the air inlet hole provided on the valve seat 104. After the air replenishment is completed, the pressure difference between the two ends of the valve disc weakens, the elastic potential energy of the elastic element 4 is released, and the valve disc closes the air inlet hole.

[0004] To ensure smooth movement and cushioning capacity, and to prevent damage to components due to excessive impact, a buffer groove is typically provided on the valve seat 104. This buffer groove, together with the valve core 31, forms a buffer chamber 102. The buffer chamber 102 stores hydraulic oil, and a sealing ring 105 seals the valve core 31 and the valve seat 104 to prevent hydraulic oil leakage within the buffer chamber 102. An annular boss 103 is provided on the valve core 31, located within the buffer groove (buffer chamber 102), and the outer wall of the annular boss 103 is in clearance fit with the inner wall of the buffer chamber 102. That is, whether opening or closing the air inlet, the valve core 31 moves downwards with the valve disc, such as... Figure 1 As shown, the oil on one side of the annular boss 103 will enter the other side through the gap of the clearance fit. When it flows through the annular boss 103, a throttling phenomenon will occur, thereby achieving buffering. Therefore, it can be determined that such a spring-loaded air valve will also experience a buffering process during the opening of the air inlet, resulting in a delay in the opening process. Furthermore, during the frequent movement of the valve core 31, the sealing ring 105 of the sealing buffer chamber 102 will be continuously subjected to friction and torsional forces, eventually leading to damage to the sealing ring 105 over time, resulting in hydraulic oil leakage and loss of buffering capacity. Consequently, the lifespan of this type of buffered spring-loaded air valve is generally short, requiring the provision of an oil replenishment hole 101 for periodic replenishment of hydraulic oil (e.g., via...). Figure 1(Replenish hydraulic oil through the oil filler port).

[0005] Therefore, improvements are needed to this type of buffer spring-loaded air valve. Summary of the Invention

[0006] The purpose of this invention is to address the aforementioned problems by providing a buffered spring-loaded air valve and its operating method, which can effectively seal the hydraulic oil, significantly reduce the risk of hydraulic oil leakage, ensure the service life of the buffered spring-loaded air valve, and also has a high response speed.

[0007] The technical solution adopted in this invention is as follows: A buffer spring-type air replenishment valve includes a housing and a valve core. The housing has an air inlet at the top and an air outlet at the bottom, and the air inlet and outlet are connected through the interior of the housing. The valve core is located inside the housing and is fixedly connected to the housing. The valve core is covered by a valve cover, which is a sealed cavity containing hydraulic oil. The valve core passes through the top of the valve cover and is slidably connected to the top of the valve cover. An elastic element is provided between the valve cover and the valve core. A valve disc is fixed outside the valve cover, and the valve disc moves with the valve cover to realize the state transition between closing and opening the air inlet. Hydraulic oil is stored inside the valve cover.

[0008] Furthermore, the valve cover includes a cylinder and a base and a top seat fixed to both ends of the cylinder. A sealing element is provided between the base and the lower end of the cylinder, and the top seat is fixed to the upper end of the cylinder and is in clearance fit with and slidably connected to the valve core.

[0009] Furthermore, the bottom of the valve core has a core seat, the outer diameter of which matches the inner diameter of the cylinder.

[0010] Furthermore, a buffer groove is provided on the end face of the core seat near the base, and a buffer boss is provided on the base near one end of the core seat. The outer wall of the buffer boss is fitted with the inner wall of the buffer groove with a clearance. A connecting groove is provided on the core seat, which penetrates through the two end faces of the core seat so that hydraulic oil can enter the buffer groove.

[0011] Furthermore, the elastic element is fitted onto the valve core, and one end of the elastic element is connected to the top seat. The other end of the elastic element is provided with a rotating plate, which is fitted onto the valve core. A ball bearing is provided between the rotating plate and the core seat.

[0012] Furthermore, the top seat and the core seat are provided with multiple annular pressure equalization grooves, which are distributed along the axial direction.

[0013] Furthermore, a first rib is fixed to the top of the housing, and an mounting plate is installed on the first rib. The top of the valve core is fixed on the mounting plate. Multiple first rubber buffer pads are provided on the top seat or the mounting plate. After the valve disc closes the air inlet, the first rubber buffer pads are in contact with the mounting plate and the top seat.

[0014] Furthermore, a second rib is provided inside the cylinder, and a second rubber buffer pad is fixed on the second rib. After the valve disc fully opens the air inlet, the second rubber pad acts as a lower limit and fits against the valve disc.

[0015] Furthermore, a sealing rubber gasket is provided at the air inlet, the sealing rubber gasket has a conical hole, and the outer side of the valve disc has a conical surface with the same taper as the conical hole.

[0016] A method for operating a buffer spring-type air supply valve, applicable to the aforementioned buffer spring-type air supply valve, includes the following steps: S1: When the buffer spring air supply valve changes from the closed state to the open state to supply air, it includes steps S11-S12; S11: Negative pressure appears at the air outlet. The pressure difference between the two ends of the valve disc exceeds the set value. Under the action of this pressure difference, the valve disc moves away from the air inlet along with the valve cover until the air inlet opens and outside air enters the housing to replenish the air outlet. S12: In step S11, the valve cover moves axially relative to the valve core, the buffer boss no longer fills the buffer groove, and the hydraulic oil in the valve cover enters the buffer groove through the connecting groove to prepare for subsequent buffering; at the same time, the elastic deformation of the elastic element increases, and it has greater elastic potential energy, which prepares for the subsequent drive of the valve disc to close the air inlet. S2: When the buffer spring air supply valve changes from the open state to the closed state to seal, it includes steps S21-S23. S21: When the air pressure at the outlet returns to normal and there is no pressure difference between the two ends of the valve disc or the pressure difference is lower than the set value, under the action of the elastic potential energy of the elastic element in step S13, the valve disc moves together with the valve cover towards the air inlet; until the valve disc closes the air inlet, thus sealing the air inlet. S22: In step S21, the valve cover moves axially relative to the valve core, the buffer boss gradually enters the buffer groove, squeezing the hydraulic oil in the buffer groove, and the hydraulic oil slowly flows out from the gap between the buffer boss and the buffer groove, realizing the movement of the buffer valve cover; the elastic potential energy of the elastic element is reduced but still has elastic potential energy.

[0017] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: This invention achieves its structural change by surrounding the valve core with a valve cover, storing the hydraulic oil inside the valve core, and moving the valve cover when the air inlet opens and closes. This effectively seals the hydraulic oil inside the valve cover, thus preventing hydraulic oil leakage and eliminating the need for hydraulic oil replenishment, thereby effectively improving the lifespan of the buffer spring air supply valve. Attached Figure Description

[0018] The present invention will be described by way of example and with reference to the accompanying drawings, wherein: Figure 1 This is a schematic diagram of the spring-loaded air valve described in the background art. Figure 2 This is a schematic diagram of the structure of the present invention; Figure 3 for Figure 2 Enlarged view of point A in the middle; Figure 4 for Figure 2 Cross-sectional view along the middle BB direction; The markings in the diagram are: 1-outer shell; 11-air inlet; 12-air outlet; 13-first rib; 14-mounting plate; 15-second rib; 2-valve cover; 21-cylinder; 22-top seat; 23-base; 31-valve core; 32-core seat; 33-rotating plate; 34-ball bearing; 35-buffer groove; 36-connecting groove; 4-elastic element; 5-first rubber buffer pad; 6-pressure equalizing groove; 7-valve disc; 8-sealing rubber pad; 9-second rubber buffer pad; 101-oil replenishment hole; 102-buffer cavity; 103-annular boss; 104-valve seat; 105-sealing ring; 106-circumferential positioning constraint rod. Detailed Implementation

[0019] In the description of this specification, it should be noted that if terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," or "outer" appear to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use, they are only for the convenience of describing this specification and simplifying the description, and do not indicate or imply that the device or component 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 specification.

[0020] Furthermore, the use of terms such as "horizontal" and "vertical" in this specification does not imply that the component must be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0021] In the description of this specification, it should also be noted that, unless otherwise expressly specified and limited, the terms “set up,” “install,” “connect,” and “link” should be interpreted broadly. For example, a link can be a fixed link, a detachable link, or an integral link; it can be a mechanical link or an electrical link; it can be a direct link or an indirect link through an intermediate medium; it can be a connection within two components.

[0022] In this specification, the buffer spring air supply valve is typically installed vertically, meaning the air inlet is positioned high in space and the air outlet is positioned low in space. Therefore, the position near the air inlet is referred to as the top, top, upper part, or upper end; and the position near the air outlet is referred to as the bottom, bottom end, lower part, or lower end. Thus, for a given component, the top position is higher than the bottom position.

[0023] Example 1 like Figures 2-4 As shown, a buffer-type spring-loaded air valve includes a housing 1 and a valve core 31. The housing 1 has an air inlet 11 at the top and an air outlet 12 at the bottom, with the air inlet 11 and the air outlet 12 communicating through the interior of the housing 1. The valve core 31 is located inside the housing 1 and is fixedly connected to the housing 1. The valve core 31 is covered by a valve cover 2, which is a sealed cavity containing hydraulic oil. The valve core 31 passes through the top of the valve cover 2 and is slidably connected to the top of the valve cover 2. Based on the vertical installation of this buffer-type spring-loaded air valve, the top of the valve core 31 passes through the valve cover 2 and is fixedly connected to the housing 1, while the bottom of the valve core 31 is located inside the valve cover 2. An elastic element 4 is provided between the valve cover 2 and the valve core 31. A valve disc 7 is fixed outside the valve cover 2, and the valve disc 7 moves with the valve cover 2 to realize the state transition between closing and opening the air inlet 11. Hydraulic oil is stored inside the valve cover 2.

[0024] In this embodiment, the basic operating process of the buffer spring-loaded air valve is as follows: When negative pressure occurs at the outlet 12, there is a pressure difference between the upper and lower surfaces of the valve disc 7. If the pressure difference exceeds the set value, the valve disc 7 moves away from the inlet 11 along with the valve cover 2 under the action of the pressure difference until the inlet 11 is opened and outside air enters the housing 1 to replenish the outlet 12. When the air pressure at the outlet 12 returns to normal, and there is no pressure difference or the pressure difference is lower than the set value at both ends of the valve disc 7, under the action of the elastic potential energy of the elastic element 4, the valve disc 7 moves together with the valve cover 2 toward the air inlet 11; until the valve disc 7 closes the air inlet 11, thus sealing the air inlet 11.

[0025] It should be noted that the pressure difference setting value should meet the condition that "the generated pressure can overcome the elastic force of the elastic element 4 when the valve disc 7 closes the air inlet 11, and can overcome the possible frictional force"; the elastic element 4 is preferably a compression spring.

[0026] To further explain, by placing the air inlet 11 at the top and using the compression spring as the elastic element 4, the elastic potential energy of the elastic element 4 is minimized when the valve disc 7 closes the air inlet 11. This means that the pressure difference required to overcome this elastic potential energy to open the air inlet 11 is smaller, thus achieving a more sensitive response.

[0027] In this embodiment, based on the arrangement of the valve cover 2 and the valve core 31, there is no need to set a sealing ring 105 between the valve core 31 and the valve cover 2. There is no leakage point of hydraulic oil on the valve cover 2. Even if there is relative movement between the valve core 31 and the valve cover 2, the hydraulic oil is completely sealed inside the valve cover 2. Therefore, the hydraulic oil will not leak. Furthermore, the hydraulic oil can act as a lubricant, keeping the inner wall of the valve cover 2 in a lubricated state. That is, the friction generated between the relative movement of the valve cover 2 and the valve core 31 is low, which allows the valve disc 7 to open or close the air inlet 11 quickly. At the same time, the hydraulic oil can also act as a buffer oil, which can effectively buffer the impact kinetic energy generated by the movement of the valve cover 2. In summary, this buffer spring air replenishment valve has a longer service life than the existing air replenishment valve.

[0028] Example 2 Based on Example 1, further feasible implementation methods are proposed.

[0029] In one feasible implementation, the valve cover 2 includes a cylinder 21 and a base 23 and a top seat 22 fixed at both ends of the cylinder 21. A sealing element is provided between the base 23 and the lower end of the cylinder 21. The sealing element can be a sealing ring 105. The sealing ring 105 moves with the valve cover 2 and does not contact the valve core. Therefore, the sealing ring 105 is not affected by torsion and friction, resulting in a longer service life. The top seat 22 is fixed to the upper end of the cylinder 21 and is clearance-fitted and slidably connected to the valve core 31. The sealing element at this position seals the connection between the base 23 and the cylinder 21, preventing hydraulic oil from leaking from any gaps that may exist between the base 23 and the cylinder 21. It should be noted that since the sealing element is installed on the valve cover 2 and located between the cylinder 21 and the base 23, the sealing element also moves when the valve cover 2 moves. Therefore, the sealing element is not affected by factors such as friction and torsion, thus achieving the purpose of effectively sealing the hydraulic oil inside the valve cover 2 for a long time.

[0030] It should be noted that the cylinder 21 and the base 23 are detachably connected. On the one hand, this facilitates the processing and production of the valve cover 2, avoiding the practical difficulties of overall processing and production; on the other hand, based on the presence of the valve core 31 and the elastic element 4, the detachable connection enables the effective installation of the valve cover 2. Of course, the connection between the top seat 22 and the cylinder 21 can be either non-detachable or detachable. Taking the detachable connection as an example, during installation, the top seat 22 is first placed on the valve core 31, and then the elastic element 4 is placed on the valve core 31 and fixedly connected to the top seat 22; then the cylinder 21 is placed on the valve core 31, and the cylinder 21 is connected to the top seat 22; the remaining components of the valve core 31 (such as the core seat 32 mentioned later) are installed, and then the base 23 is installed on the cylinder 21; this also facilitates disassembly for maintenance; given the detachable connection between the base 23 and the cylinder 21, it is necessary to provide a sealing element between the base 23 and the cylinder 21.

[0031] In this embodiment, the top seat 22 and the valve core 31 are fitted with a clearance and slidably connected, which not only ensures the movement of the valve cover 2, but also effectively provides support (details will be explained in detail later). On the other hand, the clearance fit allows air to slowly enter and slowly flow out of the valve cover 2, achieving an air buffering effect through a throttling effect (the hydraulic oil does not fill the entire space of the valve cover 2, and the volume of the hydraulic oil is usually no more than half of the internal volume of the valve cover 2). This air buffering effect, in conjunction with the hydraulic oil buffering described below, further slows down the movement speed of the valve cover 2, thereby reducing the movement speed of the valve disc 7 and weakening the impact damage caused when the valve disc 7 comes into contact with other components (such as the air inlet 11 and the second rubber buffer pad 9 described later).

[0032] In one feasible implementation, the bottom of the valve core 31 has a core seat 32, the outer diameter of which matches the inner diameter of the cylinder 21; by the outer wall of the core seat 32 fitting against the inner wall of the cylinder 21, the radial swing of the cylinder 21 can be restricted, thereby constraining the valve cover 2, guiding the movement of the valve cover 2, and ensuring that the valve cover 2 moves along the axial direction.

[0033] On the other hand, combined with the cooperation between the top seat 22 and the valve core 31 mentioned above, the cooperation between the core seat 32 and the cylinder 21 can realize two support points to support the valve core 31 and the valve cover 2, which can ensure stable support and minimize the friction between the valve core 31 and the valve cover 2, so that the movement of the valve cover 2 can respond quickly, and the air inlet 11 can open and close quickly.

[0034] In one feasible implementation, a buffer groove 35 is provided on the end face of the core seat 32 near the base 23. A buffer boss is provided on one end of the base 23 near the core seat 32, and the outer wall of the buffer boss is fitted with the inner wall of the buffer groove 35 with a gap. A connecting groove 36 is provided on the core seat 32, which penetrates both end faces of the core seat 32 to allow hydraulic oil to enter the buffer groove 35. This design is for hydraulic oil buffering. Specifically, during the opening of the air inlet 11, the valve cover 2 moves, taking the buffer boss out of the buffer groove 35. A relative negative pressure is formed inside the buffer groove 35. Under the action of its own gravity and the pressure difference on both sides of the core seat 32, the hydraulic oil flows from the space of the cylinder 21 above the core seat 32 into the space of the cylinder 21 below the core seat 32 through the connecting groove 36, that is, it first enters the space between the core seat 32 and the base 23. The hydraulic oil then enters the buffer groove 35 until it is full. Since this process does not compress the hydraulic oil and the hydraulic oil can flow freely through the connecting groove 36, it is hardly affected by buffering or damping during the opening of the air inlet 11. Therefore, the opening of the air inlet 11 can respond quickly. During the closing of the air inlet 11, the valve cover 2 moves and carries the buffer boss into the buffer groove 35, which compresses the hydraulic oil in the buffer groove 35. The hydraulic oil leaves the buffer groove 35 through the gap between the outer wall of the buffer boss and the inner wall of the buffer groove 35 and returns to the space of the cylinder 21 above the core seat 32. The hydraulic oil buffering capacity is achieved by using the throttling effect, which slows down the movement speed of the valve cover 2, thereby reducing the movement speed of the valve disc 7 and weakening the impact damage caused when the valve disc 7 comes into contact with other components (such as the air inlet 11 and the second rubber buffer pad 9 described later).

[0035] One feasible implementation method is as described in the prior art in the background section, and Figure 1 As shown, when the air inlet 11 is opened, i.e., during air replenishment, the airflow enters the air inlet 11 in a swirling manner. This airflow causes the valve disc 7 to rotate, which in turn causes the valve core 31 to rotate, thus causing the elastic element 4 to twist. This is a phenomenon that needs to be suppressed in the industry. Therefore, as... Figure 1As shown, there is at least one circumferential positioning constraint rod 106, which passes through the valve seat 104 and then through the valve disc 7, allowing the valve disc 7 to move axially but not circumferentially. While this solution effectively avoids the adverse effects of valve disc 7 rotation, the friction between the valve disc 7 and the circumferential positioning constraint rod 106, as well as the non-parallelism between the circumferential positioning constraint rod 106 and the valve core 31 or the valve disc 7's movement stroke, also result in higher resistance to valve disc opening, leading to a higher opening delay, i.e., a slower response speed. The speed is slow; therefore, based on the scheme described in the buffer spring air supply valve proposed in this invention, further, the elastic element 4 is sleeved on the valve core 31, and one end of the elastic element 4 is connected to the top seat 22. The other end of the elastic element 4 is provided with a rotating plate 33, which is sleeved on the valve core 31, and a ball bearing 34 is provided between the rotating plate 33 and the core seat 32. This arrangement is because there is no circumferential constraint between the valve cover 2 and the valve core 31. The reason for not providing circumferential constraint is to reduce the structural requirements and minimize the relative movement between the valve cover 2 and the valve core 31. To ensure rapid response of the valve cover 2's movement, friction points are addressed by using a sliding groove and a slider. The sliding groove is located on the valve cover 2 (valve core 31), and the slider is located on the valve core 31 (valve cover 2). The sliding direction of the slider is along the axial direction of the valve cover 2 or valve core 31. Although this can restrict the circumferential movement of the valve cover 2, the cooperation between the slider and the sliding groove increases the contact points, thus increasing the friction points. Furthermore, the presence of the circumferential positioning constraint rod 106 also increases the resistance to valve disc opening, resulting in a delayed valve disc opening, i.e., a slow response speed. Therefore, this… The buffer spring-type air supply valve does not have any other structure to constrain the valve cover 2 circumferentially. This means that the valve cover 2 may rotate circumferentially during movement. Due to the presence of the elastic element 4, the circumferential rotation of the valve cover 2 will also cause the elastic element 4 to twist. Therefore, the ball bearing 34 between the rotating plate 33 and the core seat 32 effectively solves this problem. In addition, the presence of the ball bearing 34 also reduces the friction between the rotation of the elastic element 4 and the core seat 32 (changing from sliding friction to rolling friction), thereby reducing friction and enabling the valve cover 2 to respond quickly to movement.

[0036] In one feasible implementation, the top seat 22 and the core seat 32 are provided with a plurality of annular pressure equalizing grooves 6, which are distributed along the axial direction to reduce the radial resultant force and maintain the coaxiality of the valve core 31 and the valve cover 2.

[0037] Of course, pressure equalization grooves 6 can also be set on the buffer boss.

[0038] The equalizing tank 6 is a common structure in this industry, and its effect is well known, so it will not be described in detail again.

[0039] In one feasible implementation, a first rib 13 is fixed to the top of the housing 1, and an mounting plate 14 is installed on the first rib 13. The top of the valve core 31 is fixed to the mounting plate 14. A plurality of first rubber buffer pads 5 are provided on the top seat 22 or the mounting plate 14. After the valve disc 7 closes the air inlet 11, the first rubber buffer pads 5 are in contact with the mounting plate 14 and the top seat 22. The first rubber buffer pads 5 further reduce the impact energy of the valve cover 2 when it is reset.

[0040] To further explain, based on the fact that the valve core 31 is relatively fixed to the housing 1, the first rib 13 can effectively provide the valve core 31 with an installation position and fixed support on the basis of the air inlet setting; specifically, the top of the valve core 31 can be provided with an external thread, and after the external thread passes through the mounting plate 14, it is locked by a nut to fix the valve core 31 to the mounting plate 14, thereby realizing the fixed connection between the valve core 31 and the housing 1.

[0041] In one feasible implementation, a second rib 15 is provided inside the housing 1, and a second rubber buffer pad 9 is fixed on the second rib 15. After the valve disc 7 fully opens the air inlet 11, the second rubber pad acts as a lower limit and fits against the valve disc 7 to limit the valve disc 7.

[0042] In one feasible implementation, a sealing rubber gasket 8 is provided at the air inlet 11. The sealing rubber gasket 8 has a conical hole, and the outer side of the valve disc 7 has a conical surface with the same taper as the conical hole, so that the rubber gasket is pressed by the valve disc 7 to achieve a sealing effect. This structure and the installation structure of the sealing rubber gasket 8 are common structures in the industry, and their effects are well known, so they will not be described in detail again.

[0043] In one feasible implementation, a connecting flange is provided at the lower end of the housing 1, and the buffer spring air supply valve is installed through the connecting flange.

[0044] Example 3 A method for operating a buffer spring-type air supply valve, applied to the buffer spring-type air supply valve described in any one of the embodiments of Examples 1-2, includes the following steps: S1: When the buffer spring air supply valve changes from the closed state to the open state to supply air, it includes steps S11-S12; S11: Negative pressure appears at the air outlet 12. The pressure difference between the two ends of the valve disc 7 exceeds the set value. Under the action of this pressure difference, the valve disc 7 moves away from the air inlet 11 along with the valve cover 2 until the air inlet 11 opens and outside air enters the housing 1 to replenish the air outlet 12. S12: In step S11, the valve cover 2 moves axially relative to the valve core 31, the buffer boss no longer fills the buffer groove 35, and the hydraulic oil in the valve cover 2 enters the buffer groove 35 through the connecting groove 36 to prepare for subsequent buffering; at the same time, the elastic deformation of the elastic element 4 increases, and it has greater elastic potential energy, which prepares for the subsequent drive of the valve disc 7 to close the air inlet 11. S2: When the buffer spring air supply valve changes from the open state to the closed state to seal, it includes steps S21-S22. S21: The air pressure at the outlet 12 returns to normal, and there is no pressure difference between the two ends of the valve disc 7 or the pressure difference is lower than the set value. In step S13, under the action of the elastic potential energy of the elastic element 4, the valve disc 7 moves together with the valve cover 2 towards the air inlet 11 until the valve disc 7 closes the air inlet 11, thereby sealing the air inlet 11. S22: In step S21, the valve cover 2 moves axially relative to the valve core 31, the buffer boss gradually enters the buffer groove 35, squeezing the hydraulic oil in the buffer groove 35, and the hydraulic oil slowly flows out from the gap between the buffer boss and the buffer groove 35, realizing the movement of the buffer valve cover 2; the elastic potential energy of the elastic element 4 is reduced but still has elastic potential energy.

[0045] This invention is not limited to the specific embodiments described above. The invention extends to any new feature or combination disclosed in this specification, as well as any new method or process step or combination disclosed herein.

Claims

1. A cushioned spring air charge valve characterized by: The utility model provides a valve, including shell (1) and valve core (31), the top of shell (1) is provided with air inlet (11), the bottom has air outlet (12), air inlet (11) with air outlet (12) pass through shell (1) inside communication, valve core (31) is located in shell (1) and valve core (31) is fixedly connected with shell (1), valve core (31) is covered with valve cover (2), valve cover (2) is sealed cavity and stores hydraulic oil in valve cover (2), valve core (31) passes through the top of valve cover (2) and is connected with the top of valve cover (2) sliding, be provided with elastic part (4) between valve cover (2) and valve core (31), valve cover (2) is fixed with valve disc (7) outside, and this valve disc (7) moves with valve cover (2) to realize the state change between valve disc (7) closes air inlet (11) and opens air inlet (11).

2. The cushioned spring air charge valve of claim 1, wherein: The valve cover (2) includes a cylinder body (21), a base (23) and a top seat (22) fixed to both ends of the cylinder body (21), a sealing member is arranged between the base (23) and the lower end of the cylinder body (21), and the top seat (22) is fixed to the upper end of the cylinder body (21) and is in clearance fit and sliding connection with the valve core (31).

3. The cushioned spring air charge valve of claim 2, wherein: The bottom of the valve core (31) has a core seat (32), and the outer diameter of the core seat (32) matches the inner diameter of the cylinder body (21).

4. The cushioned spring air charge valve of claim 3, wherein: An end face of the core seat (32) close to the base (23) is provided with a buffer groove (35), and a buffer boss close to one end of the core seat (32) is arranged on the base (23), the outer wall of the buffer boss is in clearance fit with the inner wall of the buffer groove (35), and a communication groove (36) is arranged on the core seat (32) and penetrates through both end faces of the core seat (32) to allow hydraulic oil to enter the buffer groove (35).

5. The cushioned spring air charge valve of claim 3, wherein: The elastic part (4) is sleeved on the valve core (31), one end of the elastic part (4) is connected with the top seat (22), the other end of the elastic part (4) is provided with a rotating plate (33), the rotating plate (33) is sleeved on the valve core (31), and a ball bearing (34) is arranged between the rotating plate (33) and the core seat (32).

6. The cushioned spring air charge valve of claim 3, wherein: The top seat (22) and the core seat (32) are provided with a plurality of annular pressure equalizing grooves (6), and the plurality of pressure equalizing grooves (6) are distributed along the axial direction.

7. The cushioned spring air charge valve of claim 2, wherein: The top of the shell (1) is fixed with a first rib plate (13), the first rib plate (13) is provided with a mounting plate (14), and the top of the valve core (31) is fixed on the mounting plate (14); a plurality of first rubber buffer pads (5) are arranged on the top seat (22) or the mounting plate (14), and the first rubber buffer pads (5) are attached to the mounting plate (14) and the top seat (22) after the valve disc (7) closes the air inlet (11).

8. The cushioned spring air charge valve of claim 1, wherein: The inside of the shell (1) is provided with a second rib plate (15), the second rib plate (15) is fixed with a second rubber buffer pad (9), and the second rubber pad is attached to the valve disc (7) as a lower limit after the valve disc (7) completely opens the air inlet (11).

9. The cushioned spring air charge valve of any one of claims 1-8, wherein: A sealing rubber pad (8) is arranged at the air inlet (11), the sealing rubber pad (8) has a tapered hole, and the outer side surface of the valve disc (7) has a tapered surface with the same taper as the tapered hole.

10. A method for operating a cushioned spring air charging valve according to any one of claims 1 to 9, characterized in that: Includes the following steps: S1: When the buffer spring air supply valve changes from the closed state to the open state to supply air, it includes steps S11-S12; S11: Negative pressure appears at the air outlet (12), and the pressure difference between the two ends of the valve disc (7) exceeds the set value. Under the action of this pressure difference, the valve disc (7) moves away from the air inlet (11) along with the valve cover (2) until the air inlet (11) is opened and outside air enters the housing (1) to replenish the air outlet (12). S12: In step S11, the valve cover (2) moves axially relative to the valve core (31), the buffer boss no longer fills the buffer groove (35), and the hydraulic oil in the valve cover (2) enters the buffer groove (35) through the connecting groove (36) to prepare for subsequent buffering; at the same time, the elastic deformation of the elastic element (4) increases, and it has greater elastic potential energy, which prepares for the subsequent drive valve disc (7) to close the air inlet (11); S2: When the buffer spring air supply valve changes from the open state to the closed state to seal, it includes steps S21-S23. S21: The air pressure at the outlet (12) returns to normal, and there is no pressure difference or the pressure difference is lower than the set value at both ends of the valve disc (7). In step S13, under the action of the elastic potential energy of the elastic element (4), the valve disc (7) moves together with the valve cover (2) towards the air inlet (11); until the valve disc (7) closes the air inlet (11) to achieve the sealing of the air inlet (11); S22: In step S21, the valve cover (2) moves axially relative to the valve core (31), the buffer boss gradually enters the buffer groove (35), squeezing the hydraulic oil in the buffer groove (35), and the hydraulic oil slowly flows out from the gap between the buffer boss and the buffer groove (35), realizing the movement of the buffer valve cover (2); the elastic potential energy of the elastic element (4) is reduced but still has elastic potential energy.

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