Emptying valve
By setting up a pressure reduction assembly and throttle in the vent valve, the noise, vibration and erosion problems of the existing vent valve under high pressure differential and solid-containing particles are solved, and the media flow rate is slowed down and the system safety and production efficiency are improved.
Patent Information
- Application Number
- CN202311473752.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-11-07
- Publication Date
- 2025-05-09
AI Technical Summary
When the medium is overpressurized, the existing vent valves have large pressure difference and fast flow rate, resulting in large noise and vibration. The medium contains coal powder particles, which will cause flushing the inner parts and pipelines of the valve, increasing safety hazards, and may cause jamming when the valve is closed, affecting production safety and efficiency.
A vent valve is designed. By providing a pressure reduction assembly in the valve cavity, including at least two pressure reduction sleeves arranged sequentially, the wall of the pressure reduction sleeve is provided with a plurality of throttling holes, and the inner cavity is in communication with the inlet and outlet of the medium. The valve core moves in the pressure reduction assembly to adjust the flow area of the medium passage and slow down the flow rate of the medium.
It effectively slows down the flow rate of the medium, avoids the flushing of the valve body and valve chamber components by the medium, reduces noise and vibration, improves the safety and production efficiency of the system, and is suitable for gas media containing solid particles such as coal ash.
Smart Images
Figure CN119957725A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of vent valves, and in particular to a vent valve. Background Art
[0002] During the start-up, normal production and emergency shutdown of the gasifier, the vent valve is mainly used to vent and discharge the medium when it is over-pressured. However, the vent valve will produce a lot of noise and vibration due to the large pressure difference before and after the valve and the extremely fast flow rate. In addition, the presence of coal powder particles in the medium will cause serious erosion of the valve internals and the pipeline after the valve, causing great safety hazards. In addition, during the closing process of the valve, it is easy to cause jamming and other faults, so that the system pressure cannot be raised to the normal operating pressure, and then the system will be shut down for processing, which will affect the safe, stable, long-term and full-load operation of production, and seriously affect the production efficiency. Summary of the invention
[0003] In response to the above-mentioned technical problems existing in the prior art, the present application provides a vent valve, which can adapt to the flow path of a medium containing solid particles by setting a pressure reduction component, effectively slowing down the flow rate of the medium and avoiding the problem of the medium scouring the valve body and components inside the valve cavity.
[0004] The embodiment of the present application provides a vent valve, including a valve stem and a valve seat, and further comprising:
[0005] A valve body having a valve cavity, the valve seat being arranged in the valve cavity, and the valve body being provided with a medium inlet and a medium outlet communicating with the valve cavity;
[0006] A pressure reducing assembly is arranged on the valve seat of the valve cavity, the pressure reducing assembly comprises at least two pressure reducing sleeves which are sleeved in sequence, a wall surface of the pressure reducing sleeve is provided with a plurality of throttling holes, and an inner cavity of the pressure reducing sleeve is respectively connected with the medium inlet and the medium outlet;
[0007] A valve core is arranged in the inner cavity of the pressure reducing component. One end of the valve stem is connected to the valve core and is used to drive the valve core to move in the inner cavity of the pressure reducing component to adjust the flow area of the medium passage in which the medium inlet and the medium outlet are connected through the inner cavity of the pressure reducing sleeve.
[0008] In some embodiments, the vent valve further includes a balancing cylinder having a cylinder body, the cylinder body is sleeved in the inner cavity of the pressure reducing sleeve, and the cylinder body is sleeved outside the valve core.
[0009] In some embodiments, the total area of the throttling holes on the pressure reduction sleeve is gradually increased along the pressure reduction sleeve from the inside to the outside to slow down the flow rate of the medium.
[0010] In some embodiments, at least one pressure balancing hole is formed at one end of the valve core facing the medium inlet.
[0011] In some embodiments, the vent valve further includes a guide ring, which is sleeved outside the valve core, and an outer wall of the guide ring abuts against an inner wall of the balance cylinder.
[0012] In some embodiments, the throttle holes provided on adjacent pressure reduction sleeves are staggered.
[0013] In some embodiments, the intervals between adjacent depressurization sleeves gradually increase along the arrangement of the depressurization sleeves from inside to outside to slow down the flow rate of the medium.
[0014] In some embodiments, the lower portion of the inner cavity of the depressurization sleeve is open, and the medium inlet is connected to the medium outlet through the lower opening of the depressurization sleeve.
[0015] In some embodiments, the profile of the valve core is configured to control the medium flow rate according to a linear flow characteristic within a first opening range, and to control the medium flow rate according to an equal percentage flow characteristic within a second opening range; wherein the first opening range is smaller than the second opening range.
[0016] In some embodiments, the pressure reduction sleeve includes a first pressure reduction sleeve and a second pressure reduction sleeve, the second pressure reduction sleeve is sleeved outside the first pressure reduction sleeve, and the total area of the throttling holes on the first pressure reduction sleeve is smaller than the total area of the throttling holes on the second pressure reduction sleeve.
[0017] Compared with the prior art, the beneficial effects of the embodiments of the present application are as follows: the present application can form an effective throttling and expansion space by setting a pressure reduction component, so that the vent valve can adapt to the flow path of the medium containing solid particles, effectively slow down the flow rate of the medium, and avoid the problem of the medium scouring the valve body and the components inside the valve cavity. It is more adaptable to gas media with complex components, containing solid particles such as coal ash and easy to form hard lumps than conventional low-noise vent valves, and can effectively prevent the accumulation and erosion of the medium, thereby achieving the step-by-step pressure reduction and vibration reduction effect of the gas medium containing solid particles. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] In the drawings, which are not necessarily drawn to scale, the same reference numerals may describe similar components in different views. The drawings generally illustrate various embodiments by way of example and not limitation, and together with the description and claims, serve to illustrate the disclosed embodiments. When appropriate, the same reference numerals are used throughout the drawings to refer to the same or similar parts. Such embodiments are illustrative and are not intended to be exhaustive or exclusive embodiments of the present apparatus or method.
[0019] Figure 1 This is a cross-sectional view of a vent valve according to an embodiment of the present application;
[0020] Figure 2 It is a cross-sectional view of a pressure reducing assembly of a vent valve according to an embodiment of the present application;
[0021] Figure 3 This is a schematic diagram of the medium flow direction of the vent valve in the embodiment of the present application.
[0022] The components indicated by the reference numerals in the figures are:
[0023] 1-valve body; 11-medium inlet; 12-medium outlet; 2-valve seat; 3-pressure reducing assembly; 31-first pressure reducing sleeve; 32-second pressure reducing sleeve; 4-balancing cylinder; 5-valve core; 6-valve stem; 7-valve cover; 8-guide ring; 9-pressure balancing hole. DETAILED DESCRIPTION
[0024] In order to enable those skilled in the art to better understand the technical solution of the present application, the present application is described in detail below in conjunction with the accompanying drawings and specific implementation examples. The embodiments of the present application are further described in detail below in conjunction with the accompanying drawings and specific implementation examples, but are not intended to limit the present application.
[0025] The words "first", "second" and similar words used in this application do not indicate any order, quantity or importance, but are only used to distinguish different parts. The words "include" or "comprise" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.
[0026] In the present application, when a specific device is described as being located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device. When a specific device is described as being connected to other devices, the specific device may be directly connected to the other device without an intermediate device, or may not be directly connected to the other device but have an intermediate device.
[0027] All terms (including technical terms or scientific terms) used in this application have the same meaning as those understood by ordinary technicians in the field to which this application belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined herein.
[0028] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.
[0029] The embodiment of the present application provides a vent valve. The vent valve is not limited to the application of pressure control of solid particle-containing syngas in coal gasification devices, but is also applicable to throttling and discharge application systems with compressible gases such as steam and air in industries such as power, petrochemicals, air separation, and hydrogen energy.
[0030] like Figures 1 to 3 As shown, the vent valve includes a valve cover 7, a valve stem 6, a valve seat 2, a valve body 1, a pressure reducing assembly 3 and a valve core 5. The valve body 1 has a valve cavity, the valve seat 2 is arranged in the valve cavity, and the valve body 1 is provided with a medium inlet 11 and a medium outlet 12 connected to the valve cavity. The pressure reducing assembly 3 is arranged on the valve seat 2 of the valve cavity, and the pressure reducing assembly 3 includes at least two pressure reducing sleeves arranged in sequence, and the wall surface of the pressure reducing sleeve is provided with a plurality of throttling holes, and the inner cavity of the pressure reducing sleeve is respectively connected with the medium inlet 11 and the medium outlet 12. The valve core 5 is arranged in the inner cavity of the pressure reducing assembly 3, and one end of the valve stem 6 is connected to the valve core 5, which is used to drive the valve core 5 to move in the inner cavity of the pressure reducing assembly 3 to adjust the flow area of the medium passage connected by the medium inlet 11 and the medium outlet 12 through the inner cavity of the pressure reducing sleeve. The inner cavity of the above-mentioned pressure reducing sleeve can be understood as the inner cavity surrounded by the pressure reducing sleeve that is farther away from the medium outlet 12 than other pressure reducing sleeves.
[0031] Figure 3 The arrow direction shown in the figure is the flow direction of the medium in the vent valve. After the medium enters the valve cavity through the medium inlet 11, it will flow to the medium outlet 12 through the throttle hole connected to the valve cavity, and then be discharged through the medium outlet 12.
[0032] Optionally, the valve seat 2 is located at the medium inlet 11, the pressure reducing assembly 3 is placed between the valve seat 2 and the valve cover 7, the valve cover 7 presses the pressure reducing assembly 3 and the valve seat 2 onto the valve body 1, and the valve stem 6 passes through the packing hole provided on the valve cover 7 to be connected with the valve core 5. When the valve stem 6 moves up and down relative to the valve body 1, it can drive the valve core 5 to move up and down synchronously.
[0033] Optionally, the valve core 5, driven by the valve stem 6, at least opens or cuts off the passage connecting the medium inlet 11 and the medium outlet 12 through the inner cavity of the pressure reducing sleeve, and the degree of opening of the valve core can adjust the flow area of the vent valve for discharging the medium.
[0034] Optionally, the pressure reduction assembly 3 can achieve step-by-step pressure reduction through multiple pressure reduction sleeves to gradually slow down the flow rate of the medium. The step-by-step pressure reduction method can be adjusted by one or more of the following methods: the size of the throttle hole, the number of the throttle holes, and the gap between adjacent pressure reduction sleeves.
[0035] Optionally, the throttling holes are evenly arranged along the inner wall of the pressure reducing sleeve.
[0036] The throttling holes of the multiple pressure reducing sleeves of the pressure reducing assembly 3, the gaps between the pressure reducing sleeves at each stage, and the gap between the pressure reducing sleeve adjacent to the valve core 5 and the valve core 5 can form an effective throttling and expansion space, constituting a three-dimensional flow path for the medium.
[0037] The present application can form an effective throttling and expansion space by setting up a pressure reduction component 3, so that the vent valve can adapt to the flow path of the medium containing solid particles, effectively slow down the flow rate of the medium, and avoid the problem of the medium scouring the valve body 1 and the components in the valve cavity. It is more adaptable to gas media with complex components, containing solid particles such as coal ash and easy to form hard lumps than conventional low-noise vent valves, and can effectively prevent the accumulation and erosion of the medium, thereby achieving the step-by-step pressure reduction and vibration reduction effect of the gas medium containing solid particles.
[0038] In some embodiments, Figure 1 As shown, the vent valve further includes a balancing cylinder 4, which has a cylinder body, which is sleeved in the inner cavity of the pressure-reducing sleeve, and the cylinder body is sleeved outside the valve core 5. The balancing cylinder 4 can guide the valve core 5 over a large area, effectively strengthen the restriction on the lateral vibration of the components in the valve cavity, and solve the problems of vibration and jamming of the vent valve under high pressure difference and solid particle containing working conditions.
[0039] Optionally, the cylinder body of the balancing cylinder 4 is cylindrical in structure, the valve core 5 is located in the cylindrical cavity of the cylinder body, and the valve core 5 can be slidably connected to the balancing cylinder 4 to achieve the purpose of opening, closing and flow regulation of the vent valve, that is, the venting volume and flow rate of the circulating medium are adjusted by locating the vent valve core 5 in different positions in the cylinder body.
[0040] In some embodiments, Figures 1 to 3 As shown, the total area of the throttling holes on the pressure reducing sleeve is gradually increased along the arrangement from the inside to the outside of the pressure reducing sleeve, so as to slow down the flow rate of the medium by expanding the space.
[0041] Optionally, the above-mentioned gradual increase in the total area can be achieved by controlling the size and number of the throttling holes.
[0042] In some embodiments, Figure 1 As shown, at least one pressure balance hole 9 is formed at one end of the valve core 5 facing the medium inlet 11. By providing the pressure balance hole 9, the thrust applied to the valve core 5 for the required movement can be reduced, and the accumulation of medium impurities can be effectively prevented.
[0043] Optionally, the pressure balance holes 9 may be evenly arranged along the axis of the valve core 5. Figure 3 As shown, there are four pressure balance holes 9 , and the four pressure balance holes 9 are evenly arranged along the axis of the valve core 5 .
[0044] In some embodiments, Figure 1As shown, the vent valve also includes a guide ring 8, which is sleeved outside the valve core 5, and the outer wall of the guide ring 8 is against the inner wall of the balance cylinder 4. The guide ring 8 can not only isolate the high and low pressure media, but also guide the balance cylinder 4, meeting the requirements of medium flow opening, flow closing, and bidirectional. The above-mentioned flow opening can be understood as the flow direction of the medium is the same as the valve opening direction at the throttle port; the flow closing can be understood as the flow direction of the medium is the same as the valve closing direction at the throttle port.
[0045] Optionally, the guide ring 8 may be constructed as a structure with spring tension, which enables the valve core 5 to be sealed and connected to the balancing cylinder 4 .
[0046] Optionally, the material of the guide ring 8 can be adjusted according to the temperature conditions of the working scene. For high-temperature conditions, the guide ring 8 can be constructed as a high-temperature resistant graphite ring or metal ring.
[0047] In some embodiments, Figures 1 to 3 As shown, the throttle holes arranged on the adjacent pressure reducing sleeves are staggered. The staggered throttle holes are beneficial to control the discharge amount and flow rate of the medium through the valve core 5.
[0048] Optionally, the above-mentioned throttling hole can be constructed as a circular hole, and the aperture of the throttling hole of the pressure reduction sleeve gradually increases from the inside to the outside of the pressure reduction sleeve, that is, the total area of the throttling holes of the pressure reduction sleeve located on the outside is larger than the total area of the throttling holes of the pressure reduction sleeve located on the inside.
[0049] In some embodiments, Figures 1 to 3 As shown, the intervals between adjacent decompression sleeves gradually increase along the arrangement of the decompression sleeves from the inside to the outside, so as to achieve the purpose of slowing down the flow rate of the medium. The intervals between the adjacent decompression sleeves mentioned above can be understood as interstage gaps. The gradual increase of interstage gaps can gradually increase the expansion space. Such a design not only has the effect of step-by-step decompression, but also can make it difficult for impurities entering the decompression sleeve to block the main flow channel, and the applicable range of the medium that can flow is wider.
[0050] In some embodiments, Figure 1 As shown, the lower part of the inner cavity of the pressure reducing sleeve is open, and the medium inlet 11 is connected with the medium outlet 12 through the lower opening of the pressure reducing sleeve.
[0051] In some embodiments, the profile of the valve core 5 is configured to control the medium flow rate according to a linear flow characteristic within a first opening range, and to control the medium flow rate according to an equal percentage flow characteristic within a second opening range; wherein the first opening range is smaller than the second opening range. By designing the profile of the valve core 5 with dual flow characteristics, the problem of inaccurate regulation can be solved.
[0052] Optionally, the first opening range can be understood as 0% to 30%, and the second opening range is 30% to 100%.
[0053] Due to the combined design of the valve core 5 profile, the precise adjustment of the medium at a small opening and the rapid emptying at a large opening can be achieved, and the actual process requirements of different systems for the vent valve containing solid particles can be met.
[0054] The flow characteristic of the vent valve is the relationship between the flow rate of the valve and the valve stroke as the opening changes from 0% to 100%.
[0055] The above linear flow characteristic can be understood as an equal increase in stroke providing an equal increase in flow coefficient. The linear flow characteristic curve shows that the flow rate is proportional to the valve stroke. This proportional relationship provides a characteristic with a constant slope, so under a constant pressure drop, the valve gain is the same at all flow rates.
[0056] The above-mentioned equal percentage flow characteristic can be understood as equal increases in rated travel will ideally produce equal percentage changes relative to the existing flow coefficient. For an equal percentage flow characteristic, an increase in valve travel produces the same percentage change in flow. The change in flow is always proportional to the flow before the position of the valve core 5 changes. When the valve core 5 is close to the valve seat 2, the flow is very small; when the flow is very large, the change in flow will also be very large.
[0057] In some embodiments, Figures 1 to 3 As shown, the pressure reducing sleeve includes a first pressure reducing sleeve 31 and a second pressure reducing sleeve 32, wherein the second pressure reducing sleeve 32 is sleeved outside the first pressure reducing sleeve 31, and the total area of the throttle holes on the first pressure reducing sleeve 31 is smaller than the total area of the throttle holes on the second pressure reducing sleeve 32. The purpose of stable pressure reduction and slowing down the flow rate can be achieved through the first pressure reducing sleeve 31 and the second pressure reducing sleeve 32.
[0058] The working principle of the vent valve in this application is explained below: Figure 1 As shown, Figure 1 The vent valve shown in the figure is in a closed state. At this time, the valve core 5 is driven into the bottom of the balance cylinder 4 through the valve stem 6, and contacts the valve seat 2 to form a seal. The medium flows through the inner cavity of the valve seat 2 from the medium inlet 11, and is blocked by the valve core 5 and cannot flow out through the pressure reducing sleeve and the medium outlet 12.
[0059] The valve core 5 is driven upward by the valve stem 6, so that the vent valve switches from the closed state to the open state, and the medium can flow from the medium inlet 11 through the inner cavity of the valve seat 2 to the throttling hole of the pressure reduction sleeve. The flow rate is slowed down through the throttling holes and interstage gaps of the pressure reduction sleeves at each stage, and then the medium flows out through the medium outlet 12.
[0060] The valve core 5 is driven by the valve stem 6 to move up and down, and the relative position between the valve core 5 and the valve seat 2 can change the flow area of the medium passage, thereby achieving the purpose of regulating the medium flow.
[0061] In addition, although exemplary embodiments have been described herein, the scope includes any and all embodiments based on the present application with equivalent elements, modifications, omissions, combinations (e.g., various embodiments intersecting schemes), adaptations or changes. The elements in the claims will be interpreted broadly based on the language used in the claims, and are not limited to the examples described in this specification or during the practice of the application, and the examples will be interpreted as non-exclusive.
[0062] The above description is intended to be illustrative rather than restrictive. For example, the above examples (or one or more of them) can be used in combination with each other. For example, those of ordinary skill in the art can use other embodiments when reading the above description. In addition, in the above-mentioned specific embodiments, various features can be grouped together to simplify the application. This should not be interpreted as an intention that a disclosed feature that does not require protection is necessary for any claim. On the contrary, the subject matter of the present application may be less than all the features of a specific disclosed embodiment. Thus, the following claims are incorporated into the specific embodiments as examples or embodiments, wherein each claim is independently used as a separate embodiment, and it is considered that these embodiments can be combined with each other in various combinations or arrangements. The scope of the present application should be determined with reference to the attached claims and the full scope of equivalent forms granted by these claims.
[0063] The above embodiments are only exemplary embodiments of the present application and are not intended to limit the present application. The protection scope of the present application is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present application within the essence and protection scope of the present application, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present application.
Claims
1. A vent valve, comprising a valve stem and a valve seat, characterized in that: Also includes: A valve body having a valve cavity, the valve seat being arranged in the valve cavity, and the valve body being provided with a medium inlet and a medium outlet communicating with the valve cavity; A pressure reducing assembly is arranged on the valve seat of the valve cavity, the pressure reducing assembly comprises at least two pressure reducing sleeves which are sleeved in sequence, a wall surface of the pressure reducing sleeve is provided with a plurality of throttling holes, and an inner cavity of the pressure reducing sleeve is respectively connected with the medium inlet and the medium outlet; A valve core is arranged in the inner cavity of the pressure reducing component. One end of the valve stem is connected to the valve core and is used to drive the valve core to move in the inner cavity of the pressure reducing component to adjust the flow area of the medium passage in which the medium inlet and the medium outlet are connected through the inner cavity of the pressure reducing sleeve.
2. The vent valve according to claim 1, characterized in that: The vent valve further includes a balancing cylinder having a cylinder body, the cylinder body is sleeved in the inner cavity of the pressure reducing sleeve, and the cylinder body is sleeved outside the valve core.
3. The vent valve according to claim 1, characterized in that: The total area of the throttle holes on the pressure reducing sleeve is gradually increased along the arrangement from the inside to the outside of the pressure reducing sleeve to slow down the flow rate of the medium.
4. The vent valve according to claim 1, characterized in that: At least one pressure balancing hole is formed at one end of the valve core facing the medium inlet.
5. The vent valve according to claim 2, characterized in that: The vent valve further comprises a guide ring, which is sleeved outside the valve core, and the outer wall of the guide ring abuts against the inner wall of the balance cylinder.
6. The vent valve according to claim 1, characterized in that: The throttling holes arranged on the adjacent pressure reducing sleeves are arranged in a staggered manner.
7. The vent valve according to claim 1, characterized in that: The intervals between adjacent decompression sleeves gradually increase along the arrangement of the decompression sleeves from inside to outside, so as to slow down the flow rate of the medium.
8. The vent valve according to claim 1, characterized in that: The lower part of the inner cavity of the depressurization sleeve is open, and the medium inlet is connected with the medium outlet through the lower opening of the depressurization sleeve.
9. The vent valve according to claim 1, characterized in that: The profile of the valve core is configured to control the medium flow rate according to a linear flow characteristic within a first opening range, and to control the medium flow rate according to an equal percentage flow characteristic within a second opening range; wherein the first opening range is smaller than the second opening range.
10. The vent valve according to claim 1, characterized in that: The pressure reducing sleeve comprises a first pressure reducing sleeve and a second pressure reducing sleeve, wherein the second pressure reducing sleeve is sleeved outside the first pressure reducing sleeve, and the total area of the throttle holes on the first pressure reducing sleeve is smaller than the total area of the throttle holes on the second pressure reducing sleeve.