grey lock pressure stop valve

Abstract

The present disclosure relates to a grey lock pressure charging stop valve, comprising a valve body, a valve seat, a valve rod and a valve disc, further comprising a driving device, a first buffer structure and a second buffer structure, the valve rod is controlled by the driving device to sequentially have a first displacement and a second displacement in the direction of the valve seat, so as to press the valve disc on the valve rod tightly on the valve seat; the first buffer structure and the second buffer structure are respectively arranged between the valve rod and the valve disc; the first buffer structure is configured to buffer the valve seat when the valve rod enters the first displacement; the first buffer structure and the second buffer structure are configured to buffer the valve seat together when the valve rod continues to move from the first displacement to the second displacement. The impact force on the valve seat is buffered by two sections, which avoids damage to the sealing surface of the valve disc and / or the valve seat due to excessive impact force, resulting in valve sealing failure, leakage accidents, safety and economic losses.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of angle valve, in particular to a dust lock pressure charging stop valve. BACKGROUND

[0002] At present, the stop valve is mainly applied in the fields of gas extraction, oil extraction, chemical industry and the like, which includes pipelines containing solid particle medium, such as crude coal gas, dust, sand-containing natural gas and the like. When the medium is applied to such pipelines, the sealing requirement of the valve is very high, and the cooperation of the conventional valve seat and valve clack is difficult to meet the sealing requirement.

[0003] In addition, in order to ensure the sealing effect between the valve seat and the valve clack, a transmission mechanism with sufficient driving force is usually used, such as hydraulic transmission, pneumatic transmission, electric drive transmission and the like, and the valve clack and the valve seat are sealed by cooperating with the valve rod. However, due to the large driving force of such device, in the process of closing the stop valve, the collision between the valve clack sealing pair and the valve seat sealing pair will cause damage to the valve clack or the valve seat, which seriously affects the service life of the stop valve. SUMMARY

[0004] The present disclosure provides a dust lock pressure charging stop valve to solve the problems in the prior art.

[0005] According to a first aspect of the present disclosure, a dust lock pressure charging stop valve is provided, comprising a valve body with a valve cavity, and a valve seat, a valve rod and a valve clack movably connected to the valve rod in the valve cavity, further comprising:

[0006] a driving device, an output end of the driving device being connected with the valve rod, the valve rod being controlled by the driving device to sequentially have a first displacement and a second displacement in the direction of the valve seat, so as to press the valve clack on the valve rod against the valve seat;

[0007] a first buffer structure and a second buffer structure, a stiffness coefficient of the second buffer structure being greater than that of the first buffer structure, the first buffer structure and the second buffer structure being respectively arranged between the valve rod and the valve clack;

[0008] the first buffer structure being configured to buffer the valve seat when the valve rod enters the first displacement; the first buffer structure and the second buffer structure being configured to buffer the valve seat together when the valve rod continues to move from the first displacement to the second displacement.

[0009] In an embodiment of the present disclosure, a limiting portion is arranged on the valve clack, and a stop portion is arranged on the valve rod, the stop portion being configured to cooperate with the limiting portion to limit the movement amplitude of the valve rod relative to the valve clack.

[0010] In one embodiment of the present disclosure, a cover is arranged on the valve disc, the cover and the valve disc form an inner cavity, the end surface of the cover and the valve disc forms the limiting part; a through hole is arranged on the cover to allow the end of the valve rod to extend into, and the stop part is fixed on the part of the valve rod that extends into the inner cavity.

[0011] In one embodiment of the present disclosure, the first buffer structure is a spring arranged between the valve rod and the valve disc.

[0012] In one embodiment of the present disclosure, the spring is sleeved on the part of the valve rod outside the inner cavity, one end of the spring abuts against the outer side wall of the cover, and the other end abuts against the flange arranged on the valve rod.

[0013] In one embodiment of the present disclosure, the spring is arranged in the valve cavity, and a bellows is sleeved on the periphery of the spring and the valve rod; one end of the bellows is connected with the cover, and the other end is connected with the outer wall of the flange.

[0014] In one embodiment of the present disclosure, the second buffer structure is a wave spring arranged between the valve rod and the valve disc.

[0015] In one embodiment of the present disclosure, the wave spring is arranged in the inner cavity and on the end surface of the valve disc; the stop part on the valve rod is configured to contact the wave spring after moving a first displacement in the direction of the valve seat.

[0016] In one embodiment of the present disclosure, the position on the valve seat for contacting the valve disc is an arc surface; and the surface of the valve disc for contacting the valve seat is a spherical surface.

[0017] In one embodiment of the present disclosure, the above-mentioned ash lock pressurized stop valve comprises:

[0018] A valve cover support is arranged on the valve body;

[0019] A trigger is arranged on the valve rod and is configured to move synchronously with the valve rod;

[0020] First and second sensors are arranged on the valve cover support; the trigger is configured to trigger the first sensor when the valve rod moves to the closed position, and to trigger the second sensor when the valve rod moves to the open position;

[0021] A control unit is configured to control the driving device to stop when receiving an electrical signal that the first sensor or the second sensor is triggered.

[0022] One beneficial effect of the present disclosure is that, in the process of the valve stem driving the valve disc to move to the valve seat until it is in place, the impact force between the valve disc and the valve seat is weakened by the first buffer structure and the second buffer structure, avoiding damage to the valve disc and the valve seat due to excessive impact force, which leads to valve sealing failure, leakage accidents, and safety and economic losses.

[0023] Other features of the present disclosure and its advantages will become apparent from the following detailed description of exemplary embodiments thereof, taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0024] The accompanying drawings incorporated in and forming a part of the specification illustrate embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0025] Figure 1 is a schematic view of a gray lock pressure charging stop valve in a closed state according to an embodiment of the present disclosure;

[0026] Figure 2 is a partial enlarged view of Figure 1 ;

[0027] Figure 3 is a partial enlarged view of Figure 1 ;

[0028] Figure 4 is a structural schematic view of the valve stem entering the first displacement according to an embodiment of the present disclosure;

[0029] Figure 5 is a partial enlarged view of Figure 4 ;

[0030] Figure 6 is a structural schematic view of a gray lock pressure charging stop valve in an open state according to an embodiment of the present disclosure.

[0031] Figures 1 to 6 The one-to-one correspondence between the names of the components in the and the reference numerals is as follows:

[0032] 11, valve body; 111, valve cavity; 12, valve seat; 121, opening; 13, valve stem; 131, stop portion; 132, flange; 14, valve disc; 141, limiting portion; 141a, upper limiting portion; 141b, lower limiting portion; 142, inner cavity; 15, cover body; 151, through hole; 16, bellows; 17, trigger piece; 18, valve cover support; 181, first sensor; 182, second sensor;

[0033] 21, first buffer structure; 22, second buffer structure;

[0034] 3, driving device; 31, driving rod. DETAILED DESCRIPTION

[0035] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. Note that the relative arrangement, numerical expressions, and numerical values of components and steps set forth in these embodiments are not limiting to the scope of the present disclosure unless specifically stated otherwise.

[0036] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the scope of the disclosure, its application, or uses.

[0037] Techniques, methods, and devices known to those of ordinary skill in the relevant art can not be discussed in detail herein, but should be considered as part of the description if appropriate.

[0038] Note that similar reference numerals and letters indicate similar items throughout the drawings, and thus once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0039] The specific embodiments of the present disclosure will be described below with reference to the accompanying drawings.

[0040] In this document, "upper", "lower", "front", "rear", "left", "right", and the like are used to describe relative positions between the relevant parts, and do not limit the absolute positions of the relevant parts.

[0041] In this document, "first", "second", and the like are used only to distinguish between the relevant parts from each other, and do not indicate importance and order, and are not a prerequisite for each other.

[0042] In this document, "equal", "same", and the like are not strictly limited in the mathematical and / or geometric sense, but also include errors that can be understood by those skilled in the art and allowed in manufacturing or use.

[0043] The present disclosure provides a dust lock pressure charging stop valve, which can be applied to a conveying pipeline containing solid particle medium in the conveying medium, such as a pipeline for transporting coarse gas, dust, or sand-containing natural gas. The dust lock pressure charging stop valve can realize the on-off of the pipeline for transporting coarse gas, dust, or sand-containing natural gas in the conveying medium.

[0044] The dust lock pressure charging stop valve includes a valve body having a valve cavity, a valve seat, a valve stem, and a valve disc movably connected to the valve stem in the valve cavity. The on-off of the pipeline can be realized by the cooperation between the valve disc and the valve seat. The valve stem can be driven by a hand wheel, a hydraulic drive mechanism, a pneumatic drive mechanism, or an electric drive mechanism to drive the valve disc to contact and cooperate with the valve seat, thereby closing the dust lock pressure charging stop valve, or driving the valve stem to drive the valve disc away from the valve seat, thereby opening the dust lock pressure charging stop valve.

[0045] The gray lock pressurized shut-off valve disclosed herein also includes a drive device, which can be a hydraulic drive device, an electric drive device, or a pneumatic drive device, etc. The drive end of the drive device is connected to the valve stem, and the valve stem can drive the valve disc to move relative to the valve seat under the drive of the drive device. During the movement of the valve stem towards the valve seat, the valve stem is controlled by the drive device to undergo a first displacement and a second displacement in the direction towards the valve seat, and then presses the valve disc on the valve stem against the valve seat.

[0046] A first buffer structure and a second buffer structure are also provided between the valve stem and the valve disc. These two buffer structures buffer the valve seat, with the second buffer structure having a higher stiffness coefficient than the first. During the movement of the valve stem towards the valve seat, when the valve stem reaches the first displacement, the first buffer structure buffers the valve seat. Then, when the valve stem reaches the second displacement, both the first and second buffer structures jointly buffer the valve seat until the valve stem reaches its final position. Through the cooperation of the first and second buffer structures, the first buffer structure provides relatively gentle buffering during the first displacement, and then the first and second buffer structures work together to buffer the valve seat during the second displacement, causing the valve stem to stop moving. This two-stage buffering reduces the impact force of the valve disc on the valve seat, preventing damage to both the valve disc and the valve seat, which could lead to valve sealing failure, leakage, and safety and economic losses.

[0047] In the embodiments of this disclosure, the valve stem and valve disc have the ability to move relative to each other, and the valve stem also drives the valve disc to cooperate with the valve seat. Therefore, the impact mentioned above refers to the mutual impact between the three.

[0048] For ease of understanding, please refer to the following: Figures 1 to 6 The specific structure and working principle of this disclosure will be explained in detail with reference to the embodiments.

[0049] refer to Figure 1 In one embodiment of this disclosure, the ash lock pressurization shut-off valve includes a valve body 11 having a valve cavity 111, a valve seat 12, a valve stem 13, and a valve disc 14 movably connected to the valve stem 13, all located within the valve cavity 111. The ash lock pressurization shut-off valve can be installed in a delivery pipeline, which can be used to deliver media such as liquids, gases, solid-liquid mixtures, gas-solid mixtures, or gas-liquid mixtures. (Reference) Figure 1In the view direction, the valve cavity 111 is configured in the shape of approximately 90°, the valve seat 12 is located at the lower end of the valve cavity 111, and the inlet end of the valve cavity 111 is arranged at the right side of the valve body 11. The center of the valve rod 13 and the valve disc 14 is located on the central axis of the valve seat 12, and the valve disc 14 is driven by the valve rod 13 to move relative to the valve seat in the central axis direction of the valve disc 14. When the valve rod 13 drives the valve disc 14 to move to the opening 121 corresponding to the valve seat 12, the ash lock pressurization stop valve is in a closed state, thereby blocking the pipeline where the ash lock pressurization stop valve is located; when the valve rod 13 drives the valve disc 14 to move away from the opening 121 of the valve seat 12, the ash lock pressurization stop valve is in an open state, and the conveying medium in the pipeline flows normally. The type of the conveying medium and the flow direction in the valve cavity need to be determined according to the actual situation, and no limitation is made.

[0050] The ash lock pressurization stop valve of the present disclosure further comprises a driving device 3, which can be a hydraulic driving device, an electric driving device, or a pneumatic driving device, etc. The output end of the driving device 3 is connected with the valve rod 13 together, for driving the valve rod 13 to move along the central axis direction of the valve seat 12. In the process of closing the ash lock pressurization stop valve, the valve rod 13 is controlled by the driving device 3 to sequentially have a first displacement and a second displacement in the direction of the valve seat 12, so as to press the valve disc 14 connected with the valve rod 13 on the valve seat 12, wherein the first displacement can be greater than the second displacement.

[0051] The ash lock pressurization stop valve of the present disclosure, the valve rod 13 and the valve disc 14 are movably connected together, that is, a certain distance of relative movement is allowed to occur between the valve rod 13 and the valve disc 14. The first buffer structure 21 and the second buffer structure 22 are respectively arranged between the valve rod 13 and the valve disc 14, and the stiffness coefficient of the second buffer structure 22 is greater than that of the first buffer structure 21. The first buffer structure 21 and the second buffer structure 22 are used for buffering the movement of the valve rod 13 to the valve seat 12.

[0052] In detail, the first buffer structure 21 is configured to buffer the valve seat 12 for the first time when the valve rod 13 enters the first displacement, and the second buffer structure 22 is not in contact with the valve rod 13 in the process of the first displacement; when the valve rod 13 continues to move from the first displacement to the second displacement, the first buffer structure 21 and the second buffer structure 22 jointly buffer the valve seat 12, which can be understood as that the first buffer structure and the second buffer structure are used in parallel in the second displacement, and jointly buffer the valve seat 12. Since the stiffness coefficient of the second buffer structure is greater than that of the first buffer structure, and the first displacement is greater than the second displacement, in the first displacement, the valve rod 13 is absorbed by the first buffer structure in a relatively moderate manner to absorb a part of the impact force, and then enters the second displacement, and the first buffer structure and the second buffer structure jointly absorb the impact force of the valve rod 13, so that the valve rod 13 stops moving.

[0053] For example, the first displacement distance is denoted as S1, and the second displacement distance is denoted as S2, S1 is greater than S2. The valve stem 13 moves to the valve seat 12 direction to enter the first displacement, and the first buffer structure 21 starts to buffer between the valve stem 13 and the valve disc 14. In this embodiment, the first displacement is calculated from the time when the valve disc 14 contacts the valve seat 12, that is, after the valve stem 13 drives the valve disc 14 to move to make the valve disc 14 contact the valve seat 12, the valve stem 13 starts the first displacement under the action of the first buffer structure 21. When the valve stem 13 continues to move S1 distance, the first buffer structure generates a deformation variable with a length of S1 to absorb part of the impact force of the valve stem 13. Then, the valve stem 13 moves to the valve seat 12 to enter the second displacement, and the first buffer structure 21 and the second buffer structure 22 jointly buffer between the valve stem 13 and the valve disc 14. In this embodiment, the second displacement is calculated from the time when the valve stem 13 contacts the second buffer structure 22, that is, after the valve stem 13 drives the valve disc 14 to move to make the valve disc 14 contact the valve seat 12, the valve stem 13 starts the first displacement under the action of the first buffer structure 21, and when the valve stem 13 moves to contact the second buffer structure 22, the valve stem 13 enters the second displacement, and the valve stem 13 acts on the first buffer structure 21 and the second buffer structure 22 in the second displacement. That is, the first buffer structure 21 always buffers between the valve stem 13 and the valve disc 14 in the first displacement and the second displacement of the valve stem 13; the second buffer structure 22 starts to buffer between the valve stem 13 and the valve disc 14 when the valve stem 13 enters the second displacement. When the valve stem 13 continues to move S2 distance, the first buffer structure 21 and the second buffer structure 22 generate a deformation variable with a length of S2 to absorb the remaining impact force, and the valve stem 13 stops moving. Through the cooperation of the first buffer structure and the second buffer structure, the first step buffer in the form of step-by-step buffer can be realized, part of the impact force of the valve stem 13 is absorbed, the damage of the valve disc 14 and / or the valve seat 12 caused by excessive impact force is prevented, and then the second step buffer is used to make the valve stem 13 completely stop, thereby ensuring the safety and reliability of the entire buffer process.

[0054] In addition, during the first displacement and the second displacement, the valve disc 14 is always subjected to the pressure from the valve stem 13 through the first buffer structure 21 and the second buffer structure 22, and the valve disc 14 can continue to displace slightly to press the valve seat 12 more tightly, thereby ensuring the sealing effect; after the valve stem 13 moves to the position through the second displacement, the valve disc 14 is pressed tightly on the valve seat 12 under the elastic force of the two buffer structures, thereby preventing the valve disc 14 from separating from the valve seat 12, and further improving the sealing effect.

[0055] Reference Figure 2In one embodiment of the present disclosure, since the valve stem 13 and the valve disc 14 are movably connected together, a limiting portion 141 is arranged on the valve disc 14, and a stop portion 131 is arranged on the valve stem 13, the stop portion 131 is configured to cooperate with the limiting portion 141 to limit the movement amplitude of the valve stem 13 relative to the valve disc 14. For example, referring to Figure 2 In the process of closing the gray lock pressure charging stop valve, the valve stem 13 drives the valve disc 14 to move towards the valve seat 12, when the valve disc 14 contacts the valve seat 12, the valve stem 13 continues to move relative to the valve disc 14 until the stop portion 131 moves to contact the lower boundary of the limiting portion 141, and then the relative movement between the valve stem 13 and the valve disc 14 stops; in the process of opening the gray lock pressure charging stop valve, the valve stem 13 needs to drive the valve disc 14 to move away from the valve seat 12, when the stop portion 131 moves to contact the upper boundary of the limiting portion 141, the relative movement between the valve stem 13 and the valve disc 14 stops, and then the valve disc 14 is driven to move upwards until it is in place.

[0056] Referring to Figure 1 and Figure 3 In one embodiment of the present disclosure, a cover 15 is arranged on the valve disc 14, the cover 15 can be connected with the valve disc 14 by welding, the cover 15 and the valve disc 14 enclose an inner cavity 142, the opposite end faces of the cover 15 and the valve disc 14 form the limiting portion 141, the cover 15 is provided with a through hole 151 allowing the end of the valve stem 13 to extend into, and the stop portion 131 is fixed on the part of the valve stem 13 penetrating into the inner cavity 142. The limiting portion 141 includes an upper limiting portion 141a and a lower limiting portion 141b, the upper limiting portion 141a is used to limit the upward movement of the stop portion 131 relative to the valve disc 14, and the lower limiting portion 141b is used to limit the downward movement of the stop portion 131 relative to the valve disc 14, thereby limiting the movement amplitude of the valve stem 13 relative to the valve disc 14.

[0057] Referring to Figure 3 In the process of closing the gray lock pressure charging stop valve, the valve stem 13 moves towards the valve disc 14 until the stop portion 131 contacts the lower limiting portion 141b, and then the valve stem 13 and the valve disc 14 move synchronously towards the valve seat 12; in the process of opening the gray lock pressure charging stop valve, the valve stem 13 moves away from the valve disc 14 until the stop portion 131 contacts the upper limiting portion 141a, and then the valve stem 13 and the valve disc move synchronously away from the valve seat 12.

[0058] Referring to Figure 2In one embodiment of the present disclosure, the first buffering structure 21 can be a spring arranged between the valve stem 13 and the valve disc 14. For example, a spring sleeve can be arranged on the valve stem 13, or a plurality of springs can be arranged around the valve stem 13. When the valve stem 13 moves the first displacement and the second displacement, the valve stem 13 and the valve disc 14 will cause the spring to sequentially generate the same deformation amount as the first displacement and the second displacement, and convert part of the impact force of the valve stem 13 into elastic potential energy to play a buffering role.

[0059] Referring to Figure 1 and Figure 3 In one embodiment of the present disclosure, the spring sleeve is arranged on the valve stem 13 outside the inner cavity 142. One end of the spring abuts against the outer sidewall of the cover 15, and the other end abuts against the flange 132 arranged on the valve stem 13.

[0060] Referring to Figure 5 When the valve stem 13 enters the first displacement, the lower end of the valve disc 14 abuts against the opening 121 of the valve seat 12, and the cover 15 connected to the valve disc 14 also stops moving. The valve stem 13 continues to move towards the valve disc 14. Referring to Figure 6 The lower end of the spring abuts against the upper end surface of the cover 15, and the upper end of the spring is compressed under the pressure of the flange 132 towards the cover 15. When the valve stem 13 moves the first displacement, the spring is compressed under the pressure of the flange 132 to generate the same deformation amount as the first displacement. Part of the impact force of the valve stem 13 is absorbed by the spring. Then, the valve stem 13 enters the second displacement, and the flange 132 continues to compress the spring. After the valve stem 13 completes the second displacement, the spring generates the same deformation amount as the second displacement. Since the first displacement is greater than the second displacement, the impact of the valve stem 13 and the valve disc 14 on the valve seat 12 can be preliminarily buffered in the first displacement, and the larger displacement amount can slow down the kinetic energy of the valve stem 13 and the valve disc 14 as much as possible.

[0061] Referring to Figure 6 In one embodiment of the present disclosure, the spring is arranged in the valve cavity 111, and a bellows 16 is arranged around the spring and the valve stem 13. In the open state of the gray lock pressure charging stop valve, the conveying medium in the valve cavity 111 can contain some solid impurities, such as conveying medium of coarse coal gas, dust or sand-containing natural gas. The bellows 16 wraps the spring and the valve stem 13, avoiding damage to the spring and the valve stem 13 caused by the scouring of the solid impurities, and improving the service life of the spring and the valve stem 13.

[0062] Referring to Figure 1 and Figure 6 One end of the bellows 16 can be connected to the cover 15, and the other end can be connected to the outer wall of the flange 132 to seal the valve stem 13 and the spring. In the process of movement of the valve stem 13, the bellows 16 expands and contracts with the change of the relative position of the flange 132 and the cover 15, for exampleFigure 1 is a compressed state of the bellows 16, Figure 6 is an elongated state of the bellows 16. Thus, the bellows 16 always seals the valve stem 13 and the spring inside, so that the delivery medium in the valve cavity 111 cannot enter the bellows 16, further avoiding the spring and the valve stem 13 from being damaged by the flushing of the delivery medium, and also avoiding the delivery medium from entering the gap of the spring, affecting the effect of the spring.

[0063] Reference Figure 2 In an embodiment of the present disclosure, the second buffering structure 22 is a wave spring arranged between the valve stem 13 and the valve disc 14. The wave spring has the characteristics of a large stiffness range and strong buffering and shock absorbing capacity, and can bear large load with small deformation.

[0064] When the valve stem 13 completes the first displacement, the spring has absorbed part of the energy, and the valve stem 13 continues to move into the second displacement. Then, the spring and the wave spring are compressed by the same deformation amount as the second displacement, and the wave spring and the spring jointly absorb the energy of the valve stem 13 to stop the movement of the valve stem 13. Since the wave spring can bear large load with small deformation, in the second displacement, the valve stem 13 can stop in a relatively short second displacement. Moreover, after completing the second displacement, the wave spring and the spring are in a compressed state and have elastic force, which can further press the valve disc 14 tightly against the opening 121 of the valve seat 12 to improve the sealing effect of the valve disc 14 and the valve seat 12.

[0065] Reference Figure 6 In an embodiment of the present disclosure, the wave spring can be arranged in the inner cavity 142 and on the end face of the valve disc 14, for example, on the lower limiting portion 142b. The stop portion 131 on the valve stem 13 is configured to contact the wave spring after moving the first displacement in the direction of the valve seat 12, and the valve stem 13 continues to move into the second displacement. Under the pressure of the stop portion 131, the stop portion 131 and the end face of the valve disc 14 jointly extrude the wave spring to buffer the impact force of the valve stem 13.

[0066] In detail, when the valve stem 13 enters the second displacement, the lower end face of the stop portion 131 extrudes the wave spring on the lower limiting portion 142b downward, and the wave spring starts to deform. At the same time, the flange 132 continues to extrude the spring on the cover body 15 downward, and the spring and the wave spring deform synchronously until the second displacement ends and the valve stem 13 stops moving. In this process, the spring and the wave spring jointly buffer the downward movement of the valve stem 13.

[0067] Reference Figure 2In one embodiment of the present disclosure, the position where the valve seat 12 contacts the valve disc 14 is an arc surface, for example, the opening 121 of the valve seat 12 is configured as an arc surface protruding towards the valve cavity. The surface of the valve disc 14 used to contact the valve seat 12 is a spherical surface.

[0068] The conventional valve seat and valve disc are sealed by matching the inclined surfaces. The manufacturing error or installation error may cause the valve seat 12 and the valve disc 14 to deviate when they are connected, so that the inclined surfaces of the valve seat and the valve disc cannot be tightly attached together, affecting the sealing effect. In the present disclosure, the connection position of the valve seat 12 and the valve disc 14 is an arc surface and a spherical surface respectively. When they are connected, as long as the arc surface of the valve seat 12 is tangent to the spherical surface of the valve disc 14, the connection can be completed, reducing the influence of manufacturing error and installation error on the sealing performance of the ash lock pressure charging stop valve.

[0069] Reference Figure 1 In one embodiment of the present disclosure, the valve seat 12 can be detachably assembled on the valve body 11. The valve seat 12 can be installed by penetrating the lower part of the valve body 11 into the inner cavity of the valve body 11. Since the valve seat 12 may be worn due to long-term erosion of the conveying medium when the conveying medium flows in the valve cavity 111, affecting the sealing effect, the valve seat 12 can be removed for maintenance or replacement, thereby improving the service life of the ash lock pressure charging stop valve.

[0070] Reference Figure 1 In one embodiment of the present disclosure, the ash lock pressure charging stop valve comprises a valve cover support 18, a trigger 17, a first sensor 181, a second sensor 182 and a control unit (not shown in the figure).

[0071] The valve cover support 18 can be connected to the valve body 11 by bolts. The valve cover support 18 has an inner cavity allowing the valve rod 13 to pass through. The valve rod 13 passes through the valve cover support 18 from the valve cavity, so that one end of the valve rod 13 can protrude out of the valve cover support 18. Correspondingly, the driving end of the driving device 3 can be provided with a driving rod 31 facing the valve rod 13. The driving rod 31 and the valve rod 13 can be connected together by a connecting member, so that the valve rod 13 and the driving rod 31 move synchronously.

[0072] The trigger 17 can be arranged on the valve stem 13 outside the bonnet bracket 18 and synchronously move with the valve stem 13, for example, the trigger 17 can be an indicating rod arranged on the valve stem 13, the indicating rod synchronously moves upward or downward along the valve stem 13 with the valve stem 13. The indicating rod can be one or two, when the indicating rod is arranged one, the first sensor 181 and the second sensor 182 are triggered by the indicating rod respectively; when the indicating rod is arranged two, the first sensor 181 and the second sensor 182 are triggered by the two indicating rods respectively. The trigger 17 can also be arranged on the driving rod 31 or the connecting piece connecting the valve stem 13 and the driving rod 31, since the valve stem 13, the driving rod 31 and the connecting piece synchronously move, the synchronous movement of the driving rod 31 and the connecting piece can also realize the trigger function.

[0073] The first sensor 181 and the second sensor 182 can be arranged on the bonnet bracket 18, for example, the first sensor 181 and the second sensor 182 can be explosion-proof valve closed position sensors and explosion-proof valve open position sensors used in cooperation with the indicating rod, and are arranged on the bonnet bracket 18 along the movement stroke of the indicating rod, so that when the driving device 3 drives the valve stem 13 to move through the driving rod 31, the trigger 17 can trigger the first sensor 181 or the second sensor 182. Of course, for those skilled in the art, the trigger of the valve stem 13 moving to the position can also be realized by displacement sensors, light sensors, micro switches and the like, which are not listed one by one here.

[0074] Reference Figure 1 The trigger 17 can be configured to trigger the first sensor 181 when the valve stem 13 moves to the closed position. The closed position can be the position of the trigger 17 relative to the bonnet bracket 18 when the gray lock pressure charging stop valve is in the closed state.

[0075] When the gray lock pressure charging stop valve is closed, the driving device 3 drives the valve stem 13 to move downward, the trigger 17 synchronously moves downward with the valve stem, when the trigger 17 moves to the corresponding position of the second sensor 182, the second sensor 182 is triggered, the second sensor 182 sends an electric signal to the control unit, after the control unit receives the electric signal, the driving device 3 is controlled to stop.

[0076] Reference Figure 6 The trigger 17 can be configured to trigger the first sensor 181 when the valve stem 13 moves to the open position.

[0077] When the gray lock pressure charging stop valve is opened, the driving device 3 drives the valve rod 13 to move upward, the trigger piece 17 moves upward synchronously with the valve rod 13, when the trigger piece 17 moves to the corresponding position of the first sensor 181, the first sensor 181 is triggered, the first sensor 181 sends an electric signal to the control unit, after the control unit receives the electric signal, the control unit controls the driving device 3 to stop.

[0078] The first sensor 181 and the second sensor 182 can send an electric signal to the control unit, after the control unit receives the electric signal, the control unit can control the driving device 3 to stop driving in time, so as to avoid that the valve rod 13 moves excessively and causes damage to the gray lock pressure charging stop valve.

[0079] In one specific embodiment of the present disclosure, the driving device 3 is a hydraulic device, which can quickly control the opening and closing of the gray lock pressure charging stop valve. When the stop valve is closed, the control unit controls the hydraulic device 3 to stop based on the electric signal triggered by the second sensor 182, the first buffer structure 21 and the second buffer structure 22 can buffer the large impact rigidity of the hydraulic device 3, and can ensure good sealing effect between the valve disc 14 and the valve seat 12.

[0080] The above has described the embodiments of the present disclosure, the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those skilled in the art without departing from the scope and spirit of the described embodiments. The selection of the terms used herein is intended to best explain the principles of the embodiments, practical application or improvement of the technology in the market, or to enable other ordinary skilled persons in the art to understand the embodiments disclosed herein. The scope of the present disclosure is defined by the appended claims.

Claims

1. A grey lock pressure-charging stop valve characterized by comprising: The valve body (11) comprises a valve cavity (111), a valve seat (12), a valve rod (13) and a valve flap (14) movably connected to the valve rod (13) in the valve cavity (111), and further comprises: a driving device (3), an output end of the driving device (3) is connected with the valve rod (13), the valve rod (13) is controlled by the driving device (3) to sequentially have a first displacement and a second displacement in the direction of the valve seat (12) so as to press the valve flap (14) on the valve rod (13) against the valve seat (12), wherein the first displacement is greater than the second displacement; a first buffer structure (21) and a second buffer structure (22), a stiffness coefficient of the second buffer structure (22) is greater than that of the first buffer structure (21), and the first buffer structure (21) and the second buffer structure (22) are respectively arranged between the valve rod (13) and the valve flap (14); the first buffer structure (21) is configured to buffer the valve seat (12) when the valve rod (13) has the first displacement, and the first buffer structure (21) and the second buffer structure (22) are configured to jointly buffer the valve seat (12) when the valve rod (13) continues to move from the first displacement to the second displacement.

2. The grey lock pressure-charging stop valve according to claim 1, characterized by a limiting portion (141) is arranged on the valve flap (14), a stop portion (131) is arranged on the valve rod (13), and the stop portion (131) is configured to cooperate with the limiting portion (141) to limit the movement amplitude of the valve rod (13) relative to the valve flap (14).

3. The grey lock pressure-charging stop valve according to claim 2, characterized by a cover body (15) is arranged on the valve flap (14), the cover body (15) and the valve flap (14) enclose an inner cavity (142), end faces of the cover body (15) and the valve flap (14) form the limiting portion (141), a through hole (151) allowing the end portion of the valve rod (13) to extend into is arranged on the cover body (15), and the stop portion (131) is fixed to the portion of the valve rod (13) penetrating into the inner cavity (142).

4. The grey lock pressure-charging stop valve according to claim 3, characterized by the first buffer structure (21) is a spring arranged between the valve rod (13) and the valve flap (14).

5. The grey lock pressure-charging stop valve according to claim 4, characterized by the spring is sleeved on the portion of the valve rod (13) outside the inner cavity (142), one end of the spring abuts against the outer sidewall of the cover body (15), and the other end abuts against a flange (132) arranged on the valve rod (13).

6. The grey lock pressure-charging stop valve according to claim 5, characterized by the spring is located in the valve cavity (111), and a bellows (16) is sleeved on the periphery of the spring and the valve rod (13); one end of the bellows (16) is connected with the cover body (15), and the other end is connected with the outer wall of the flange (132).

7. The grey lock pressure-charging stop valve according to claim 3, characterized by the second buffer structure (22) is a wave spring arranged between the valve rod (13) and the valve flap (14).

8. The grey lock pressure-charging stop valve according to claim 7, characterized by the wave spring is located in the inner cavity (142) and arranged on the end face of the valve flap (14), and the stop portion (131) on the valve rod (13) is configured to contact the wave spring after moving the first displacement in the direction of the valve seat (12).

9. The ash lock pressurizing stop valve according to claim 1, characterized by The position of the valve seat (12) for contacting the valve disc (14) is an arc surface; the surface of the valve disc (14) for contacting the valve seat (12) is a spherical surface.

10. The grey lock pressure-charging stop valve according to any one of claims 1 to 9, characterized by Comprise: A valve cover support (18) is arranged on the valve body (11); A trigger (17) is arranged on the valve stem (13) and is configured to move synchronously with the valve stem (13); A first sensor (181) and a second sensor (182) are arranged on the valve cover support (18); the trigger (17) is configured to trigger the first sensor (181) when the valve stem (13) moves to the closed position; and trigger the second sensor (182) when moving to the open position; A control unit is configured to control the drive device (3) to stop when receiving an electrical signal that the first sensor (181) or the second sensor (182) is triggered.

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