Shock-resistant steam control valve

Abstract

The utility model relates to the field of valves, in particular to an anti-shock steam control valve which comprises a valve body, a cage cover, a valve element, a valve rod and a gland, the cage cover is arranged in the valve body, the valve element is arranged in the cage cover and slides in the axial direction of the cage cover, the gland is fixedly connected with the valve element, and the valve rod is arranged in the valve body. The lower end of the valve rod penetrates through the gland and is arranged between the gland and the valve element, the valve rod applies downward driving force to the valve element, and the valve rod applies upward driving force to the gland; by adopting the structure that the valve core and the valve rod are separately connected, the valve rod and the valve core serving as a main vibration source are effectively isolated from each other in structural vibration transmission paths, so that most vibration energy generated by the valve core under the impact of high-flow-speed steam is mainly absorbed and buffered by the valve core and a guide structure; direct and rigid transmission to the valve rod is difficult.

Description

TECHNICAL FIELD

[0001] The utility model relates to valve field, concretely relates to a kind of anti-vibration steam control valve. BACKGROUND

[0002] Control valve is a key component widely used in industrial fluid conveying system, used to adjust the flow, pressure, temperature and other parameters of medium in pipeline to meet the needs of downstream process or equipment.

[0003] In steam system and other application scenarios, steam control valve mainly controls the pressure and flow parameters of steam medium, because the flow rate of steam medium is very high, and the flow rate reaches the extreme at the throttling part of control valve, therefore steam system control valve generally has the characteristics of loud noise and strong vibration, which is inevitable and can cause great harm to valve and pipeline system.

[0004] Long-term or severe vibration is a challenge that this type of control valve commonly faces during operation, which can adversely affect the structural integrity, sealing performance, adjustment accuracy and service life of the control valve itself, and also can affect the stability and safety of the pipeline system and other equipment connected thereto. SUMMARY

[0005] The technical problem to be solved by the utility model is how to cope with and alleviate the vibration problem generated during high-speed fluid adjustment of control valve, and the purpose is to provide an anti-vibration steam control valve, which reduces the risk of fatigue damage or even fracture of valve stem due to bearing severe vibration of valve core, and also reduces the influence of vibration on upper actuator.

[0006] The utility model is realized by the following technical solutions:

[0007] An anti-vibration steam control valve comprises a valve body, a cage, a valve core, a valve stem and a gland, the cage is arranged in the valve body, the valve core is arranged in the cage and slides axially along the cage, the gland is fixedly connected with the valve core, the lower end of the valve stem passes through the gland and is arranged between the gland and the valve core, the valve stem applies downward driving force to the valve core, and the valve stem applies upward driving force to the gland.

[0008] Specifically, a threaded blind hole is arranged on the upper end surface of the valve core, an external thread is arranged on the outer surface of the gland and matched with the threaded blind hole, and the gland and the valve core are connected by thread.

[0009] Specifically, a cavity is arranged between the lower end surface of the gland and the bottom surface of the threaded blind hole, the lower end of the valve stem is provided with a force-receiving part with a larger diameter than the valve stem, the gland is provided with a through hole, the lower segment of the valve stem is arranged in the through hole, and the force-receiving part is arranged in the cavity.

[0010] Specifically, the diameter of the force receiving part is greater than the diameter of the through hole, and the thickness of the force receiving part is not greater than the height of the cavity.

[0011] Optionally, the gland comprises two half-glands that are split in half, and the two half-glands clamp the lower section of the valve stem.

[0012] Optionally, the gland and the valve core are provided with a plurality of pin holes, and a plurality of fixing pins connect the gland and the valve core through the pin holes.

[0013] Optionally, the upper end of the fixing pin is sealingly welded to the gland, and the gland is sealingly welded to the valve core.

[0014] Optionally, the upper part and the lower part of the valve core are respectively provided with a sealing surface I and a sealing surface II, a buffer part is arranged between the sealing surface I and the sealing surface II, and the outer diameter of the buffer part is less than the outer diameter of the valve core.

[0015] Optionally, an upper guide groove connected to the buffer part is arranged below the sealing surface I, and a lower guide groove connected to the buffer part is arranged above the sealing surface II.

[0016] Optionally, at least one annular groove is arranged on the buffer part.

[0017] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0018] The utility model discloses a valve core and valve stem separation type connection structure, which effectively isolates the vibration transmission path of the valve stem and the valve core as the main vibration source in structure, so that most of the vibration energy generated by the valve core under high steam flow impact is mainly absorbed and buffered by the valve core itself and the guide structure, and it is difficult to directly and rigidly transmit to the valve stem. Therefore, the structure of the utility model significantly reduces the risk of fatigue damage and even fracture of the valve stem (especially in the weak parts of structural stress concentration, such as threaded connection) due to bearing the violent vibration of the valve core, and also reduces the influence of vibration on the upper actuator, thereby effectively improving the operation stability and service life of the control valve as a whole. BRIEF DESCRIPTION OF DRAWINGS

[0019] The accompanying drawings illustrate exemplary embodiments of the present utility model and, together with the general description given above, serve to explain the principles of the present utility model, wherein these drawings are included to provide further understanding of the present utility model, and the drawings are included in the present specification and constitute a part of the present specification, and do not constitute a limitation on the embodiments of the present utility model.

[0020] Figure 1 It is a structure schematic view of an anti-seismic steam control valve according to the utility model.

[0021] Figure 2 is a structural schematic view of the valve core according to the utility model.

[0022] Reference signs: 1-valve body, 2-cage, 3-valve core, 4-valve rod, 5-fixing pin, 6-pressing cover, 7-welding point, 8-welding point, 9-upper guide groove, 10-annular groove, 11-lower guide groove. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical scheme and advantages of the utility model clearer and more apparent, the utility model will be further described in detail below in combination with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the related content, and not limit the utility model.

[0024] In addition, it also needs to be explained that, in order to facilitate the description, only the parts related to the utility model are shown in the drawings.

[0025] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and other terms should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements or the interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0026] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can include that the first and second features are in direct contact, or the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "under", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0027] The embodiments in the utility model and the features in the embodiments can be combined with each other without conflict. The utility model will be described in detail below with reference to the drawings and in combination with the embodiments.

[0028] Embodiment one

[0029] As Figure 1 And Figure 2As shown, the basic structure of the anti-vibration steam control valve and the connection relationship between the core components and the basic force transmission mode are provided. The anti-vibration steam control valve comprises a valve body 1, a cage 2, a valve core 3, a valve rod 4 and a gland 6. The cage 2 is arranged in the valve body 1, the valve core 3 is arranged in the cage 2 and slides axially along the cage 2, the gland 6 is fixedly connected with the valve core 3, the lower end of the valve rod 4 penetrates through the gland 6 and is arranged between the gland 6 and the valve core 3, the valve rod 4 applies a downward driving force to the valve core 3, and the valve rod 4 applies an upward driving force to the gland 6.

[0030] The valve body 1 is a pressure-bearing shell of the control valve, which bears the pressure from the pipeline system.

[0031] The cage 2 is an internal component mounted in the valve body 1, usually in the form of a sleeve, and mainly functions to accommodate and guide the movement of the valve core 3, and may also jointly form a sealing pair with the valve core 3 to close or regulate the fluid passage, so that different sizes and numbers of holes are arranged in the lower part of the cage 2.

[0032] The valve core 3 is a movable component directly regulating the flow of fluid, which is located inside the cage 2 and is designed to slide up and down along the central axis direction of the cage 2. When the valve is closed, the two sealing surfaces (sealing surface I and sealing surface II) of the cage 2 and the valve core 3 are in close contact, thereby achieving the cut-off of the medium. After the valve is opened, the regulation of the medium flow and pressure is realized through the cage 2 and the valve core 3. The valve rod 4 drives the valve core 3 to move up and down, controls the number of holes through which the medium passes the cage 2, thereby realizing the regulation. The regulation characteristics can be equal percentage, linear, etc.

[0033] The valve rod 4 is responsible for transmitting the power from the external driving device to drive the valve core 3 to move up and down.

[0034] Due to the high flow rate of steam, under the impact of high-speed medium, the valve core 3 will inevitably vibrate. By separating the connection between the valve core 3 and the valve rod 4, the vibration of the valve core 3 will not be transmitted to the valve rod 4, thereby protecting the valve, actuator and the like. And through the cooperation of the cover, the valve rod 4 and the valve core 3, the normal driving force transmission will not be affected.

[0035] Downward driving: when it is necessary to close the valve or reduce the opening degree, the valve rod 4 moves downward, and its end can directly contact the valve core 3 to apply a downward driving force to the valve core 3.

[0036] Upward driving: when it is necessary to open the valve or increase the opening degree, the valve rod 4 moves upward. At this time, the valve rod 4 does not directly pull the valve core 3, but applies an upward driving force to the gland 6 by pushing or pulling the gland 6 upward. Since the gland 6 is fixedly connected with the valve core 3, the gland 6 in turn drives the valve core 3 to move upward.

[0037] Example two

[0038] The embodiment provides a specific structure of the gland 6 and the valve core 3.

[0039] The upper end surface of the valve core 3 is provided with a threaded blind hole, and the outer surface of the gland 6 is provided with an external thread matched with the threaded blind hole, so that the gland 6 and the valve core 3 are connected through the thread.

[0040] When the gland 6 is screwed into the valve core 3 to a predetermined position, the lower end surface of the gland 6 is not directly attached to the bottom of the threaded blind hole, and a cavity is arranged between the lower end surface of the gland 6 and the bottom surface of the threaded blind hole. The lower end of the valve rod 4 is provided with a force receiving part with a diameter larger than that of the valve rod 4, which is usually manifested as a flange, a step or a head at the end of the valve rod 4, and the diameter is larger than that of the rod body of the valve rod 4.

[0041] The gland 6 is provided with a through hole with a diameter slightly larger than that of the rod body of the valve rod 4, but smaller than that of the force receiving part, so that the lower segment of the valve rod 4 can pass through the through hole. The lower segment of the valve rod 4 is arranged in the through hole, and the force receiving part is arranged in the cavity, and the thickness of the force receiving part is not greater than the height of the cavity.

[0042] The diameter of the force receiving part is larger than that of the through hole, so that when the valve rod 4 goes up, the force receiving part is blocked by the lower edge of the through hole (i.e. part of the gland 6), thereby effectively transmitting the upward force to the gland 6.

[0043] The thickness of the force receiving part is not greater than the height of the cavity, so that the force receiving part has a certain space for movement in the cavity, which can effectively reduce the transmission of vibration.

[0044] The gland 6 includes two half covers which are split in half. The two half covers clamp the lower segment of the valve rod 4. During assembly, the two half covers can be placed on both sides of the lower segment of the valve rod 4 (above the force receiving part) respectively, and clamp the valve rod 4 like a clamp, and then the two half covers combined together are screwed into the threaded blind hole of the valve core 3 to complete the connection.

[0045] The gland 6 and the valve core 3 are provided with a plurality of pin holes, and a plurality of fixing pins 5 connect the gland 6 and the valve core 3 through the pin holes, mechanically lock the gland 6 and the valve core 3 in the radial and circumferential directions, and effectively prevent relative rotation between the two.

[0046] The upper end of the fixed pin 5 is sealingly welded to the gland 6, and the welding point 7 is at position 7 in the figure. The gland 6 is sealingly welded to the valve core 3, and the welding point 7 is at position 8 in the figure. After the fixed pin 5 is installed, the exposed upper end is welded and fixed between the gland 6 body. In addition, the interface (for example, the outer edge contact) between the gland 6 and the valve core 3 is also sealingly welded. This combination of threads, pins, and welding maximizes the firmness and vibration resistance of the connection, greatly enhances the reliability and vibration resistance of the connection between the gland 6 and the valve core 3, and ensures the stable operation and long service life of the entire split anti-vibration structure under harsh working conditions.

[0047] Embodiment three

[0048] The upper and lower parts of the valve core 3 are respectively provided with sealing surfaces I and II, and a buffer part is arranged between the sealing surfaces I and II. The outer diameter of the buffer part is smaller than that of the valve core 3, and the buffer part is inwardly contracted relative to the sealing surface regions at the upper and lower ends.

[0049] In order to smoothly transition the surface of the valve core 3 from the sealing surface region with a larger diameter to the buffer part region with a smaller diameter, avoid forming a sharp step angle, and avoid causing flow separation, vortexes, or stress concentration, an upper guide groove 9 connected to the buffer part is arranged below the sealing surface I, and a lower guide groove 11 connected to the buffer part is arranged above the sealing surface II, which helps to guide the fluid to flow more smoothly over the surface of the valve core 3, reducing flow impact.

[0050] At least one annular groove 10 is arranged on the buffer part. The annular groove 10 changes the flow state of the fluid flowing through the narrow gap between the valve core 3 and the cage 2 (for example, generating vortexes, increasing fluid damping, changing pressure pulsation frequency, etc.), so as to dissipate fluid energy, reduce flow instability, and reduce vibration and noise generated thereby.

[0051] In the description of the present specification, the description of the terms "one embodiment / way", "some embodiments / ways", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment / way or example are included in at least one embodiment / way or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment / way or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments / ways or examples. In addition, different embodiments / ways or examples described in the present specification and the features of different embodiments / ways or examples can be combined and combined by those skilled in the art without contradiction.

[0052] In addition, the terms "first", "second", etc. are used only for descriptive purposes and not to connote or imply relative importance or a quantity of the indicated technical features. Thus, a feature defined with "first", "second", etc. can include at least one of the feature explicitly or implicitly. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0053] Those skilled in the art will understand that the above embodiments are only for the purpose of clearly illustrating the present application, and are not intended to limit the scope of the present application. For those skilled in the art, other changes or modifications can be made on the basis of the above-mentioned application, and these changes or modifications are still within the scope of the present application.

Claims

1. An earthquake resistant steam control valve characterized by, The utility model relates to a valve, comprising: A valve body (1), a cage (2), a valve core (3), a valve rod (4) and a gland (6), the cage (2) is arranged in the valve body (1), the valve core (3) is arranged in the cage (2) and slides along the cage (2) axially, the gland (6) is fixedly connected with the valve core (3), the lower end of the valve rod (4) passes through the gland (6) and is arranged between the gland (6) and the valve core (3), the valve rod (4) exerts downward driving force on the valve core (3), and the valve rod (4) exerts upward driving force on the gland (6).

2. A shock-resistant steam control valve according to claim 1, characterized in that A threaded blind hole is arranged on the upper end surface of the valve core (3), and an external thread matched with the threaded blind hole is arranged on the outer surface of the gland (6), so that the gland (6) and the valve core (3) are connected through the threaded connection.

3. A shock-resistant steam control valve according to claim 2, wherein A cavity is arranged between the lower end surface of the gland (6) and the bottom surface of the threaded blind hole, the lower end of the valve rod (4) is provided with a stress part with a diameter larger than that of the valve rod (4), the gland (6) is provided with a through hole, the lower segment of the valve rod (4) is arranged in the through hole, and the stress part is arranged in the cavity.

4. A shock-resistant steam control valve according to claim 3, wherein The diameter of the stress part is larger than that of the through hole, and the thickness of the stress part is not greater than the height of the cavity.

5. A shock-resistant steam control valve according to claim 2, wherein The gland (6) comprises two half covers that are split in half, and the two half covers clamp the lower segment of the valve rod (4).

6. A shock-resistant steam control valve according to claim 2, wherein A plurality of pin holes are arranged on the gland (6) and the valve core (3), and a plurality of fixed pins (5) are connected with the gland (6) and the valve core (3) through the pin holes.

7. A shock-resistant steam control valve according to claim 6, wherein The upper end of the fixed pin (5) is connected with the gland (6) through sealed welding, and the gland (6) is connected with the valve core (3) through sealed welding.

8. The shock-resistant steam control valve of claim 1, wherein The upper part and the lower part of the valve core (3) are respectively provided with a sealing surface I and a sealing surface II, a buffer part is arranged between the sealing surface I and the sealing surface II, and the outer diameter of the buffer part is smaller than the outer diameter of the valve core (3).

9. A shock-resistant steam control valve according to claim 8, wherein An upper guide bevel (9) connected with the buffer part is arranged below the sealing surface I, and a lower guide bevel (11) connected with the buffer part is arranged above the sealing surface II.

10. A shock-resistant steam control valve according to claim 8, wherein At least one annular groove (10) is arranged on the buffer part.

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