A solid-containing multiphase flow control valve

Abstract

The present invention belongs to the field of valve technology, and specifically relates to a solid-containing multiphase flow control valve. The present invention includes a valve body, in which a valve cavity for accommodating a valve core is arranged, and is characterized in that: a straight-stroke power source is arranged on the top of the valve core, so that the valve core can perform reciprocating linear motion along the axial direction of the valve cavity under the drive of the straight-stroke power source, and the bottom of the valve cavity constitutes a medium outlet; an inlet passage is arranged in a through-type manner on the side of the valve cavity, and a valve seat is arranged in the inlet passage; and it also includes an elastic member that can apply force inward along the axial direction of the valve seat, and the inner end of the valve seat relies on the elastic member to press against the side wall of the valve core, and forms a sealing surface-type sliding fit relationship with the side wall of the valve core. The present invention has the advantages of compact structure and not easy to deposit solid-phase media. While ensuring the conveying effect of the medium, it can effectively ensure the service life of the valve stem packing seal, slow down the erosion and abrasion of the valve internals, and ultimately effectively extend the service life of the valve.

Description

Technical Field

[0001] The present invention belongs to the technical field of valves, and in particular relates to a solid-containing multiphase flow control valve. Background Art

[0002] Many processes and techniques such as coal chemical industry and petrochemical industry involve the flow control of a large amount of solid-containing multiphase flow media, which requires the use of solid-containing multiphase flow control valves. Currently, the more typical solid-containing multiphase flow control valves include pulverized coal flow control valves and black water angle valves. Among them, the pulverized coal flow control valve is used for gas-solid multiphase flow conditions in pulverized coal conveying pipelines. Its actual structure is described in the Chinese patent publication number "CN116642017A". The valve internals mainly adopt the form of a cup-shaped valve core with a side opening. The solid-containing multiphase flow medium flows into the cup-shaped valve core and then flows out to the downstream from the side opening. Failure of this valve will cause the interlocking shutdown of the device, and in severe cases, it may even cause overburning or flash explosion of the gasifier. The actual structure of the blackwater angle valve is described in Chinese patent publication number "CN211371294U." The valve trim primarily utilizes a conical valve core and a Venturi seat. The valve controls multiphase flow by creating a throttling area change between the parabolic / linear surface of the valve core and the valve seat. Blackwater angle valves are primarily used in liquid-solid multiphase flash evaporation operations, decompressing and regulating solid-laden blackwater from a gasifier or scrubber and delivering it to a flash tank for heat recovery and ashwater recycling. These two angle-type valve bodies often present the following problems: Firstly, due to the flow channel angle and the solid-laden medium being conveyed, the solid-laden medium can easily clog the valve cavity. Secondly, when the valve is closed, the solid-laden medium and the stem packing seal are both on the high-pressure side, constantly subject to high pressure. This leads to short seal life and frequent failures. Finally, the solid-containing medium on the high-pressure side flows at high speed along the valve core and the valve seat on the outlet side. However, due to the installation position of the valve seat, a fluid design cannot be achieved between the outlet valve seat and the valve core, which often exacerbates the erosion of the valve trim and reduces the overall service life of the valve. Therefore, it is urgent to solve this problem. Summary of the Invention

[0003] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a solid-containing multiphase flow control valve, which has the advantages of compact structure and is not easy to deposit solid-phase media. While ensuring the medium transportation effect, it can effectively ensure the service life of the valve stem packing seal, slow down the erosion and abrasion of the valve internals, and ultimately effectively extend the service life of the valve.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A solid-containing multiphase flow control valve includes a valve body, in which a valve cavity for accommodating a valve core is arranged. The valve body is characterized in that: a linear power source is arranged on the top of the valve core, so that the valve core can perform reciprocating linear motion along the axial direction of the valve cavity under the drive of the linear power source, and the bottom of the valve cavity constitutes a medium outlet; an inlet channel is arranged in a through-type manner on the side of the valve cavity, and a valve seat is arranged in the inlet channel; it also includes an elastic member that can apply force inward along the axial direction of the valve seat, and the inner end of the valve seat is pressed against the side wall of the valve core by the elastic member, and a sealing surface-type sliding fit relationship is formed between the side wall of the valve core.

[0006] Preferably, the valve core is sleeve-shaped, and a flow window is opened on the side wall of the valve core, and the cylindrical cavity shape of the inner end of the valve seat is consistent with the flow window shape; a guide block is arranged in the cylindrical cavity of the valve core for connecting the flow window and the medium outlet in a smooth transition shape.

[0007] Preferably, a guide sleeve is coaxially arranged in the valve cavity, with the outer wall pressed against the valve cavity wall, and the inner wall of the guide sleeve is radially protruded with guide ribs, the length direction of the guide ribs is parallel to the axial direction of the valve core, and the guide ribs are uniformly distributed on the inner wall of the guide sleeve in sequence around the axis of the guide sleeve; the inner annular surface enclosed by the guide ribs constitutes a sliding surface for the axial sliding of the valve seat, and the flow window is opened between two adjacent guide ribs; the guide sleeve is provided with an avoidance opening for the inner end of the valve seat to pass through.

[0008] Preferably, a guide sleeve is coaxially arranged in the valve cavity, and its outer wall is pressed against the valve cavity wall. The inner wall of the guide sleeve is radially protruded with guide ribs, and the length direction of the guide ribs intersects with the axial direction of the valve core. The guide ribs are evenly distributed on the inner wall of the guide sleeve in sequence around the axis of the guide sleeve and form a multi-helical structure; the inner annular surface enclosed by the guide ribs constitutes a sliding surface for the axial sliding of the valve seat, and the flow window is opened between two adjacent guide ribs; the guide sleeve is provided with an avoidance opening for the inner end of the valve seat to pass through.

[0009] Preferably, a flushing port and / or a purge port is arranged through the valve body, and the outlet channel of the flushing port and / or the purge port is located in the cavity above the guide rib, so that the flushing liquid and / or the purge gas can be flushed to the medium outlet through the channel between adjacent guide ribs.

[0010] Preferably, a countersunk hole is arranged in the inlet cavity, the outer end of the valve seat is in contact with the bottom of the countersunk hole, and a sealing ring is arranged between the two to perform sealing and elastic compensation effects, and the sealing ring constitutes the elastic member.

[0011] Preferably, the inner cavity of the valve seat has a smooth transition structure from a circular inlet to a rectangular outlet.

[0012] Preferably, along the medium flow direction, a transition bushing and a valve seat are arranged in sequence in the inlet passage, and a sealing ring is arranged between the valve seat and the transition bushing to perform sealing and elastic compensation effects, and the sealing ring constitutes the elastic part; the cross-section of the inner cavity of the valve seat is rectangular, and the inner cavity of the transition bushing is a smooth transition structure from a circular shape at the inlet to a rectangular shape at the outlet.

[0013] Preferably, an outlet bushing and a protective sleeve clamped between the outlet bushing and the valve cavity wall are coaxially arranged at the medium outlet; a limiting ring is coaxially convexly provided on the top of the outlet bushing, and a limiting opening is recessed on the top end of the protective sleeve, and a limiting structure for limiting the axial downward movement of the outlet bushing is formed between the limiting ring and the limiting opening; the bottom of the protective sleeve is limited by the outlet flange or the outlet short section to produce an axial downward movement, and the outlet flange or the outlet short section flange is fitted on the valve body.

[0014] Preferably, the linear power source is a linear hydraulic actuator.

[0015] The beneficial effects of the present invention are:

[0016] 1) Through the above-mentioned solution, the present invention takes a different approach by arranging the valve seat on the medium inlet side and forming a seal with the side of the valve core along the medium flow direction. Under the action of the elastic member + medium force, the sealing surface of the valve seat and the valve core forms a sealing pressure ratio. In addition, when the valve of the present invention is in the closed state, it can effectively confine the solid-containing medium to the valve inlet side, so that the valve cavity where the valve stem of the valve core is located does not need to withstand high pressure, and the valve stem packing seal does not need to withstand high pressure, effectively ensuring the service life of the valve stem packing seal. When the valve is in the open state, the flow window on the valve core gradually emerges in the valve seat flow channel, and the medium flows from the valve seat flow channel through the flow window on the valve core to the downstream. Combined with the angled structure of the valve, the valve cavity can be kept clean without dead corners, and solid phase medium is not easily deposited. At the same time, the downward movement of the valve core and the medium outlet at the bottom of the valve body form a closed flow structure for the entire valve that is conducive to protecting the sealing surface. It can also effectively reduce the erosion and abrasion of the valve internals and extend the service life of the valve. At the same time, since the flow direction of the solid-containing medium when flowing out of the valve core is parallel to the axis of the valve cavity outlet flow channel and is located in the center of the flow channel, the erosion of the downstream valve cavity wall by the solid-containing medium after throttling is avoided, with significant results.

[0017] 2) When designing the present invention, a sleeve-type valve core is preferred. In this case, the medium flows from the valve seat through the flow window on the valve core into the internal cavity of the valve core. The flow window on the valve core can be configured in various shapes, such as circular, rectangular, triangular, or teardrop, to achieve different flow regulation characteristics. Compared with existing solid-containing multiphase flow control valves, under conditions of equivalent throttling area, the control valve of the present invention has a wider opening, better flowability for solid-containing media, and is more conducive to preventing obstruction and blockage of solid-containing media.

[0018] 3) The guide block set inside the valve core is conducive to guiding the fluid to flow into the internal cavity of the valve core and flow smoothly to the downstream through the guide surface on the guide block, avoiding turbulent flow after throttling of solid-containing media and slowing down the erosion of valve trim and even the valve cavity.

[0019] 4) A guide sleeve with guide ribs is installed on the outside of the valve core to facilitate stable guidance of the valve core during reciprocating motion. The valve core is subject to certain lateral forces when the valve seat seals properly, and the guide sleeve with guide ribs provides support. The small contact area between the guide ribs and the valve core reduces frictional resistance during valve core movement, facilitating efficient valve core movement.

[0020] 5) The guide ribs can be parallel lines or designed to be distributed in a spiral shape along the reciprocating motion direction of the valve core; the spirally distributed guide ribs are more conducive to providing a supporting reaction force for the valve core when it is subjected to the sealing force, and can also make the guide ribs better in guiding and wrapping the valve core without increasing the contact area.

[0021] 6) The provision of flushing ports and / or purge ports on the valve body can facilitate flushing and purging of the interior of the valve cavity. Since the valve core and the guide sleeve are guided by guide ribs, the flushing and purge medium passes from the valve body through the gap between the valve core and the guide sleeve, flushing and purging the solid-containing medium in the valve cavity to the downstream. When the guide ribs are distributed in a spiral shape, it can facilitate the formation of a swirl of flushing and purge medium, thereby better stirring the solid phase in the valve cavity, allowing the solid-containing multiphase flow medium to be smoothly discharged from the valve to the downstream, minimizing the risk of siltation and blockage. At the same time, the purge or flushing medium flows along the valve cavity wall, which can also avoid or slow down the erosion of the valve cavity wall by the solid phase medium.

[0022] 7) Furthermore, when the opening on the valve core, that is, the flow channel window, is rectangular, the cross-section of the entire inlet path is preferably transitioned from a circular loft to a rectangle, and adapted to the rectangular flow window on the valve core. With this arrangement, the solid-containing multiphase flow medium can smoothly transition from the circular flow channel to the rectangular flow channel, and finally enter the flow window. The entire flow channel smoothly transitions without dead angles or obstacles, thereby making it less likely that the solid phase medium will be stuck or clogged at the throttling surface. Accordingly, when the valve seat is used alone, the inner cavity of the valve seat needs to be designed as the above-mentioned lofted structure, and when it is used in conjunction with a transition bushing, the sleeve cavity of the transition bushing can be designed as the above-mentioned lofted structure. The change in the shape of the flow channel cross section is set in the valve seat or transition bushing, which can reduce the difficulty of the manufacturing process of components such as the valve body, and is more advantageous because the valve seat or transition bushing is easy to replace and maintain later.

[0023] 8) At the medium outlet of the present invention, different types of outlet bushings can be provided according to different process requirements to adapt to different on-site application conditions, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 、 Figure 3 and Figure 4 are structural cross-sectional views of three embodiments of the present invention;

[0025] Figure 2 for Figure 1 A partial enlarged view of part I.

[0026] The actual correspondence between the reference numerals and component names of the present invention is as follows:

[0027] 10-valve body; 11-flush port; 20-valve core; 21-flow window;

[0028] 30- linear power source; 40- valve seat; 50- elastic member; 60- guide block;

[0029] 70-guide sleeve; 71-guide rib; 72-avoidance; 80-transition bushing;

[0030] 91-outlet bushing; 91a-limiting ring; 92-protective sleeve; 93-outlet flange; 94-outlet nipple. DETAILED DESCRIPTION

[0031] For ease of understanding, here we combine Figure 1-Figure 4 The specific structure and working mode of the present invention are divided into the following three groups of embodiments, which are further described below:

[0032] Example 1:

[0033] In this embodiment, the actual structure of the present invention is referred to Figure 1 and Figure 4 As shown, the general structure is still a traditional angle valve; the medium flow direction is side-in and bottom-out, that is, a valve cavity is arranged in the valve body 10, the bottom of the valve cavity forms a bottom-out medium outlet, and the side of the valve cavity is connected through a side-in inlet channel.

[0034] During assembly, the transition bushing 80 and valve seat 40 are positioned sequentially within the inlet cavity along the direction of medium flow. A sealing ring, forming part of the elastic member 50, seals the end faces of the two, providing an axially inward elastic force on the valve seat 40. The inner wall of the valve seat 40 is axially pressed against the outer wall of the valve core 20 by the elastic force of the elastic member 50. The valve core 20 slides onto the guide ribs 71 of the guide sleeve 70, which is secured to the valve cavity wall by means of expansion or other means. In operation, the linear power source 30 is preferably a linear actuator.

[0035] In actual design, the valve core 20 is a sleeve-type structure, and a flow window 21 is provided on the inner end of the valve seat 40 or the sealing side corresponding to the valve seat 40. The shape of the flow window 21 can be a rectangular, circular, triangular, teardrop-shaped or other special-shaped opening; the shape change of the flow window 21 will directly affect the hole shape change at the inner end of the valve seat 40, and the two must remain consistent. Figure 1 Taking the structure shown as an example, the flow window 21 is rectangular by default, and the inner cavity shape of the transition bushing 80 presents a smooth change or a flat change from a circle at the left end to a rectangle at the right end, and the inner cavity of the valve core 20 always presents a rectangular structure until it matches the rectangular flow window 21.

[0036] In addition, refer to Figure 1 and Figure 4 As shown, a guide block 60 can also be provided within the cylindrical cavity of the valve core 20. The guide surface of the guide block 60 can transition the arc of the flow path at the valve core 20. At the same time, the arrangement of the guide ribs 71 on the guide sleeve 70 on the outer wall of the valve core 20 is also carefully considered. They can be arranged as multiple parallel guide ribs 71 extending axially, or as a single or multiple spiral structures intersecting the axis of the valve core 20. Taking multiple parallel guide ribs 71 extending axially as an example, preferably, when there are three guide ribs 71 evenly distributed around the axis of the guide sleeve 70, the avoidance opening 72 on the side of the guide sleeve 70, through which the inner end of the valve seat 40 passes, should be distributed between two guide ribs 71. The third guide rib 71 is distributed on the other side of the valve core 20 relative to the flow window and is located in the same direction as the sealing pressure of the valve seat 40. When the valve core 20 is subjected to the sealing force from the valve seat 40, the third guide rib 71 mainly provides the supporting reaction force.

[0037] Figure 4 The guide ribs 71 are designed to provide sliding guidance for the valve core 20 and help reduce sliding friction. They also provide the aforementioned support reaction force, which can be achieved through a single guide rib 71 or through a combination of multiple guide ribs 71. Furthermore, the guide ribs 71 can cooperate with the flushing ports 11 and / or purge ports provided on the valve body 10, allowing flushing liquid and / or purge gas to be flushed through the channels between adjacent guide ribs 71 to the medium outlet, thereby maximizing the cleaning effect of solid media contained in the valve cavity.

[0038] Further, refer to Figure 1 As shown, an outlet bushing 91 is also provided at the medium outlet. The outlet bushing 91 can be straight, outward-expanded, or contracted, etc. It only needs to be assembled together with the protective sleeve 92 at the lower part of the valve cavity, and will not be described in detail here.

[0039] Example 2:

[0040] The actual structure of this embodiment is basically the same as that of embodiment 1, and attention should be paid to the installation position and assembly method of the transition bushing 80 relative to the entrance of the inlet duct; since the transition bushing 80 of embodiment 2 is used in conjunction with the inlet short section, the transition bushing 80 can be designed as a structure that relies on the inlet short section for stop-type tightening.

[0041] Example 3:

[0042] Compared with Example 2, the main difference of this embodiment is that the outlet flange 93 at the outlet is replaced with an outlet short section 94. The remaining structures can also achieve the expected effects and will not be described in detail.

[0043] Of course, it will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, but also encompasses the same or similar embodiments that can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered in all respects as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the foregoing description.

[0044] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0045] The technical parts not described in detail in the present invention are all well-known technologies.

Claims

1. A solid-containing multiphase flow control valve, comprising a valve body (10), a valve cavity for accommodating a valve core (20) arranged in the valve body (10), characterized in that: A linear power source (30) is provided on the top of the valve core (20), so that the valve core (20) can perform reciprocating linear motion along the axial direction of the valve cavity under the drive of the linear power source (30), and the bottom of the valve cavity constitutes a medium outlet; an inlet channel is provided through the side of the valve cavity, and a valve seat (40) is arranged in the inlet channel; and an elastic member (50) is also included that can apply force inward along the axial direction of the valve seat (40), and the inner end of the valve seat (40) is pressed against the side wall of the valve core (20) by the elastic member (50), and a sealing surface-type sliding fit relationship is formed between the valve seat (40) and the side wall. The valve core (20) is sleeve-shaped, and a flow window (21) is provided on the side wall of the valve core (20). The outer shape of the cylindrical cavity at the inner end of the valve seat (40) matches the outer shape of the flow window (21). A guide block (60) is arranged in the cylindrical cavity of the valve core (20) for connecting the flow window (21) and the medium outlet in a smooth transition shape.

2. The solid-containing multiphase flow control valve according to claim 1, characterized in that: A guide sleeve (70) is coaxially arranged in the valve cavity, and its outer wall is pressed against the valve cavity wall. A guide rib (71) is radially protruded on the inner wall of the guide sleeve (70). The length direction of the guide rib (71) is parallel to the axial direction of the valve core (20). Each guide rib (71) is uniformly distributed on the inner wall of the guide sleeve (70) around the axis of the guide sleeve (70). The inner annular surface formed by each guide rib (71) constitutes a sliding surface for the axial sliding of the valve seat (40). The flow window (21) is opened between two adjacent guide ribs (71); and an avoidance opening (72) is opened on the guide sleeve (70) for the inner end of the valve seat (40) to pass through.

3. The solid-containing multiphase flow control valve according to claim 1, characterized in that: A guide sleeve (70) is coaxially arranged in the valve cavity, and its outer wall is pressed against the valve cavity wall. A guide rib (71) is radially protruded on the inner wall of the guide sleeve (70). The length direction of the guide rib (71) intersects with the axial direction of the valve core (20). Each guide rib (71) is uniformly distributed on the inner wall of the guide sleeve (70) around the axis of the guide sleeve (70) and forms a multi-helical structure; the inner annular surface formed by each guide rib (71) constitutes a sliding surface for the axial sliding of the valve seat (40), and the flow window (21) is opened between two adjacent guide ribs (71); and an avoidance opening (72) is opened on the guide sleeve (70) for the inner end of the valve seat (40) to pass through.

4. A solid-containing multiphase flow control valve according to claim 2 or 3, characterized in that: A flushing port (11) and / or a purge port is arranged through the valve body (10), and the outlet channels of the flushing port (11) and / or the purge port are located in the cavity above the guide ribs (71), so that the flushing liquid and / or the purge gas can be flushed to the medium outlet through the channels between adjacent guide ribs (71).

5. A solid-containing multiphase flow control valve according to claim 1, 2 or 3, characterized in that: A countersunk hole is arranged in the inlet cavity, the outer end of the valve seat (40) contacts the bottom of the countersunk hole, and a sealing ring is arranged between the two to achieve sealing and elastic compensation effects, and the sealing ring constitutes the elastic member (50).

6. The solid-containing multiphase flow control valve according to claim 5, characterized in that: The inner cavity of the valve seat (40) is in a smooth transitional structure from a circular inlet to a rectangular outlet.

7. A solid-containing multiphase flow control valve according to claim 1, 2 or 3, characterized in that: Along the medium flow direction, a transition bushing (80) and a valve seat (40) are arranged in sequence in the inlet cavity, and a sealing ring is arranged between the valve seat (40) and the transition bushing (80) to perform sealing and elastic compensation effects, and the sealing ring constitutes the elastic member (50); the inner cavity cross-section of the valve seat (40) is rectangular, and the inner cavity of the transition bushing (80) is a smooth transition structure from a circular shape at the inlet to a rectangular shape at the outlet.

8. The solid-containing multiphase flow control valve according to claim 1, 2 or 3, characterized in that: An outlet bushing (91) and a protective sleeve (92) sandwiched between the outlet bushing (91) and the valve cavity wall are coaxially arranged at the medium outlet; a limiting ring (91a) is coaxially convexly provided on the top of the outlet bushing (91), and a limiting opening is concavely provided on the top of the protective sleeve (92); a limiting structure for limiting the axial downward movement of the outlet bushing (91) is formed between the limiting ring (91a) and the limiting opening; the bottom of the protective sleeve (92) is limited by an outlet flange (93) or an outlet short section (94) to produce an axial downward movement, and the outlet flange (93) or the outlet short section (94) is flange-fitted to the valve body (10).

9. A solid-containing multiphase flow control valve according to claim 1, 2 or 3, characterized in that: The linear power source (30) is a linear actuator.

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