Biasing valve seat and orifice plate regulating gate valve using the same

Abstract

The present application belongs to the technical field of regulating valve, and particularly relates to a bias type valve seat and an orifice plate regulating gate valve using the same. The bias type valve seat comprises a valve seat body, and a cylinder cavity of the valve seat body forms a window for medium passing. The window is an eccentric channel, and a distal end of the eccentric window is located at a side of a valve rod. The bias type valve seat can ensure that the medium can flow in the middle of the pipeline when the valve is in a small opening state, thereby effectively avoiding the problem of erosion and wear of the valve cavity wall and even the pipeline wall at the valve outlet caused by the high-speed flowing medium when the valve is in a small opening state, and finally effectively ensuring the actual service life of the regulating valve and even the pipeline at the valve outlet.

Description

Technical Field

[0001] This invention belongs to the field of regulating valve technology, specifically relating to an offset valve seat and an orifice plate regulating gate valve using the offset valve seat. Background Technology

[0002] The coal gasification quench process involves injecting coal slurry (pulverized coal) and pure oxygen together into the gasifier through burners. Partial oxidation occurs at a pressure of 4.0–6.5 MPa and a temperature of 1300–1500 °C. The resulting crude coal gas and molten slag are mixed together and then quenched by quench water sprayed from the quench ring at the bottom of the furnace. The gas then enters the quench chamber water bath through a downcomer, where gas-liquid separation occurs. Subsequently, the molten slag is discharged through a lock hopper system, enabling continuous operation of the gasifier. In the coal gasification quench process, the medium flowing in the coal chemical quench water treatment section is a liquid-solid two-phase flow of black water and ash water, containing coal gasification gases, coal solids, and even the liquid produced during coal gasification quench. Heat recovery is required via a flash tower. However, when the liquid-solid two-phase flow containing high-hardness solid particles directly enters the flash tower through pipelines, it inevitably causes severe erosion and wear on the regulating valves before the flash tower, the pipe walls, and even the anti-erosion components installed inside the flash tower. This leads to frequent equipment maintenance, affects normal production, and significantly reduces the equipment's service life. Furthermore, since the regulating valves used in this environment are all in a single-seal state, relying solely on the high pressure of the medium for pressure sealing, a decrease in medium pressure allows the liquid-solid two-phase flow to seep into the sealing surface. This not only causes medium leakage but also damages the sealing surface due to the strong erosion of the medium, necessitating shutdown for maintenance or even valve replacement, thus causing significant challenges to on-site maintenance. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide an offset valve seat that can ensure that the medium can flow in the middle of the pipeline even when the valve is at a small opening. This effectively avoids the problem of scouring and wear of the valve cavity wall and even the pipeline wall at the valve outlet caused by the high-speed flowing medium when the valve is at a small opening, and ultimately effectively ensures the actual service life of the regulating valve and even the pipeline at the valve outlet.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] An offset valve seat includes a valve seat body, the cylindrical cavity of the valve seat body forming a window for the passage of a medium, characterized in that: the window is an eccentric channel, and the eccentric distal end of the window is located on the side where the valve stem is located.

[0006] Preferably, the cross-section of the valve seat body is made along the radial direction, and the cross-sectional shape of the window is lip-shaped, rectangular, N-shaped, C-shaped, or circular.

[0007] Preferably, when the cross-sectional shape of the window is lip-shaped, N-shaped, or C-shaped, the arc formed by the eccentric distal end of the window on the cross-section and the arc formed by the outer wall of the valve seat body on the cross-section constitute a concentric circle structure.

[0008] Preferably, the orifice plate regulating gate valve uses the aforementioned offset valve seat, characterized in that: it includes a valve body with a valve cavity through which fluid can pass, and a valve seat body with the aforementioned window is coaxially arranged inside the valve cavity; it also includes a valve plate, which is driven by a valve stem with a power source to perform linear reciprocating motion along the radial direction of the valve cavity; a forced sealing wedge is also arranged inside the valve cavity, and a fitting gap is formed between the forced sealing wedge and the valve seat body to allow the valve plate to be engaged and positioned, so that after the valve plate is engaged in the fitting gap, the pressure between the forced sealing wedge and the valve seat body can press the valve plate tightly against the fitting sealing surface of the valve seat body.

[0009] Preferably, the forced sealing wedge is provided with a guide chamfer, and the valve plate is provided with a corresponding mating chamfer with the same angle as the guide chamfer, so that after the valve plate is inserted into the mating gap, the guide chamfer and the mating chamfer form a surface-fitting wedge-shaped pressing fit.

[0010] Preferably, the forced sealing wedge is in the shape of a cylindrical pin with its axis parallel to the valve stem axis.

[0011] Preferably, the shape of the valve plate matches the shape of the window.

[0012] Preferably, the valve outlet of the valve cavity has an outwardly flared funnel-shaped structure, and there is a smooth transition between the liquid inlet of the valve outlet and the liquid outlet end of the window on the valve seat body.

[0013] Preferably, on an axial section that coincides with both the valve stem axis and the valve cavity axis, the angle between the lower straight line of the valve outlet and the horizontal plane is greater than the angle between the upper straight line and the horizontal plane.

[0014] Preferably, on an axial section that coincides with both the valve stem axis and the valve cavity axis, the lowest point of the window is set at the same height as the top surface of the forced sealing wedge.

[0015] The beneficial effects of this invention are as follows:

[0016] 1) Through the above solution, the present invention provides an offset valve seat. The window of the offset valve seat adopts a clever eccentric layout, and the eccentric direction is higher than the axis of the valve seat body, that is, biased towards the direction of the valve stem. In this way, when the valve is slightly open, the high-speed medium will be sprayed into the pipeline at the valve outlet as much as possible along the center of the pipeline, instead of traveling at high speed along the pipeline wall as in traditional valves. This reduces or even avoids the direct scouring of the pipeline wall and even the valve cavity wall by the liquid-solid two-phase flow medium containing high-hardness solid particles, with significant effect.

[0017] Thus, this invention ensures that the medium can flow in the middle of the pipeline even when the valve is slightly open, thereby effectively avoiding the problem of scouring and wear of the valve cavity wall and even the pipeline wall at the valve outlet caused by the high-speed flowing medium when the valve is slightly open, and ultimately effectively ensuring the actual service life of the regulating valve and even the pipeline at the valve outlet.

[0018] 2) For windows, their shape can be designed in various ways, such as a lip-shaped, rectangular, N-shaped, C-shaped, or circular cross-section, which can be selected according to the actual situation. When the cross-section of the window is lip-shaped, N-shaped, or C-shaped, the arc formed by the eccentric end of the window on the cross-section and the arc formed by the outer wall of the valve seat body on the cross-section form a concentric circle structure, that is, the two arcs are equidistant from each other.

[0019] 3) Based on the above structure, this invention also provides an orifice plate regulating gate valve using the aforementioned offset valve seat. In use, on the one hand, the lifting and lowering action of the valve plate ensures that the high-speed fluid, upon first entering the window, is sprayed along the center of the pipeline as much as possible, thus achieving the aforementioned function of protecting the pipeline wall and even the valve cavity wall at the valve outlet. On the other hand, this invention additionally designs a forced sealing wedge. By utilizing the pressure of the forced sealing wedge, when the orifice plate regulating gate valve is fully closed, it can achieve a planar seal between the valve plate and the valve seat body through both the force of the medium and the wedging effect formed by the forced sealing wedge and the front of the valve plate, creating a certain sealing pressure between the valve plate and the valve seat body. This dual-pressure sealing structure of mechanical and medium application results in a better valve sealing effect, maintaining a good seal even under low pressure or sealing failure conditions, ultimately ensuring reliable operation of the valve in harsh environments created by high-speed movement of liquid-solid two-phase flow media.

[0020] 4) To ensure smooth cooperation between the valve plate and the forced sealing wedge when the valve plate moves downward, a chamfer with the same angle is required between the valve plate and the forced sealing wedge. The wedge surfaces of the two chamfers will cooperate to ensure that the valve plate can be effectively pressed against the valve seat body, making it very reliable and stable in use.

[0021] 5) The forced sealing wedge is cylindrical in shape. By utilizing the small space occupied by the cylindrical pin structure and the flow guiding properties of the cylindrical surface, it can minimize the impact on the travel path of the medium in the flow channel. At the same time, it can also avoid the turbulence that may be generated in the valve cavity due to the large-area obstruction of the medium, which may damage the valve cavity wall.

[0022] 6) Because the window adopts an eccentric structure, the valve outlet is matched accordingly, thus facilitating the passage of media. The angle between the lower straight line of the valve outlet and the horizontal plane is greater than the angle between the upper straight line and the horizontal plane, which allows the valve outlet to perfectly match the inlet of the existing valve outlet pipeline even if the valve seat body is significantly modified, facilitating quick assembly.

[0023] 7) The valve plate and valve seat of the orifice plate regulating gate valve in this invention need to be wear-resistant, thereby effectively improving the service life of the valve.

[0024] 8) During the entire adjustment process of the valve plate, the medium flows through the flow throat formed by the valve plate and the valve seat. Compared with other types of valves such as ball valves and butterfly valves of the same specifications, this valve has lower flow resistance and greater flow capacity. Under the same flow requirements, because the valve of this invention has a relatively large flow capacity, a smaller diameter valve can be selected, and the valve structure can be made shorter. Therefore, this invention has the characteristics of short structure and light weight, and is especially suitable for high-speed liquid-solid two-phase flow media. Attached Figure Description

[0025] Figure 1 A partial cross-sectional view of the present invention with the valve open;

[0026] Figure 2 for Figure 1 Left view of the structure shown;

[0027] Figure 3 This is a partial cross-sectional view of the invention with the valve fully closed.

[0028] Figure 4 for Figure 3 Left view of the structure shown;

[0029] Figure 5 A schematic diagram showing the fit between the guide chamfer and the mating chamfer;

[0030] Figure 6 This is a schematic diagram of one embodiment of the valve plate;

[0031] Figure 7 , Figure 8 , Figure 9 , Figure 10 and Figure 11 Cross-sectional views of five embodiments of the offset valve seat.

[0032] The actual correspondence between the reference numerals and component names in this invention is as follows:

[0033] 10-Valve seat body; 11-Window; 11a-Eccentric distal end;

[0034] 20 - Valve body; 21 - Lower straight section; 22 - Upper straight section;

[0035] 30 - Valve plate; 31 - Chamfered edge;

[0036] 40 - Power source; 50 - Valve stem; 60 - Forced sealing wedge; 61 - Guide chamfer. Detailed Implementation

[0037] For ease of understanding, this section combines... Figure 1-11 The specific structure and operation of the present invention are further described below:

[0038] The specific embodiment of the orifice plate regulating gate valve of the present invention is described in reference to the following construction method. Figure 1-4 As shown, the system includes a valve body 20, within which a valve cavity is arranged. A valve cover can also be installed on the valve body 20 to facilitate the installation of the power source 40. The valve body 20 has a valve inlet and a valve outlet communicating with the valve cavity. The valve cavity contains a valve plate 30, an offset valve seat, and a forced sealing wedge 60. During operation, the valve plate 30 is radially movable within a pre-reserved channel above the valve cavity and interacts with the offset valve seat to open and close, thereby controlling the flow between the valve inlet and outlet. In a specific design, the valve plate 30 is connected to the valve core drive unit, i.e., the power source 40, outside the valve body 20 via a valve stem 50 that penetrates the valve cover.

[0039] like Figure 7-11 As shown, the offset valve seat has a cylindrical shape, including a valve seat body 10 and a through window 11 located within the valve seat body 10. The window 11 itself has an eccentric structure, that is, it is offset from the axis of the valve seat body 10, and the eccentric distal end 11a needs to be as follows: Figure 7-11 The upward setting shown is the direction of the valve stem 50.

[0040] In addition, such as Figure 1 , Figure 3 and Figure 5-6 As shown, the end of the valve plate 30 facing the valve seat body 10 forms the main sealing surface, which, under the action of medium pressure, allows the main sealing surface to press against the mating sealing surface of the valve seat body 10, thus achieving valve closure. Simultaneously, a forced sealing wedge 60 is also provided inside the valve cavity. The forced sealing wedge 60 is fixed to the valve body 20 and parallel to the valve plate 30; the back of the forced sealing wedge 60 has a chamfered guide angle 61 for matching... Figure 5 The chamfer 31 at the valve plate 30 shown in the figure enables wedge-shaped pressing between the valve plate 30 and the valve seat body 10 when the valve is fully closed, thereby further ensuring the forced sealing effect between the valve plate 30 and the valve seat body 10.

[0041] When the throttling section at the lower end of the valve plate 30 is shaped as follows: Figure 6 When the lip shape shown is used, it can be matched better. Figure 2 and Figure 7 The lip-shaped window 11 is shown. Of course, the shape of this throttling portion can also be other shapes to accommodate different window 11 shapes; these will not be elaborated upon here. Correspondingly, the shape of the window 11 can also be rectangular, N-shaped, C-shaped, circular, etc., as detailed in the references. Figure 7-11 As shown. In use, the medium from the valve inlet enters the flow throat formed by the valve plate 30 and the valve seat body 10 through the lip-shaped throttling part at the lower end of the valve plate 30, which can realize the function of regulating the flow of the medium.

[0042] In actual operation, the present invention is as follows Figure 7 Taking window 11 with the lip-shaped structure shown as an example:

[0043] 1. When the valve plate 30 slides upward relative to the valve seat body 10 until the entire window 11 of the through-type lip structure is fully exposed, the valve is fully open, and the valve can pass the maximum flow rate, such as... Figure 1-2 As shown.

[0044] 2. When the valve plate 30 slides downward relative to the valve seat, the valve is fully closed when the window 11 of the entire through-type lip structure is completely closed. At this time, no flow passes through the valve. The forced sealing wedge 60 and the valve plate 30 achieve wedge surface sealing. The valve plate 30 and the valve seat body 10 achieve planar sealing under the combined action of the medium force and the forced sealing wedge 60.

[0045] 3. When the valve plate 30 slides up and down relative to the valve seat, the exposed area of ​​the window 11 is changed according to the required flow rate, that is, the flow throat diameter is changed online, and finally the online regulation function of the medium flow rate is realized.

[0046] In actual design, it is important to note that the window 11 of this invention must be positioned slightly above the pipe to ensure that the medium can flow in the middle of the pipe even when the valve is slightly open. This effectively reduces or even avoids the problem of erosion and wear on the valve and pipe walls caused by the high-speed medium at small openings. Simultaneously, the height of the flared structure at the valve outlet should also match the height of the window 11; in other words, if... Figure 1 The angles between the lower straight line 21 and the upper straight line 22 in the axial section shown should be different from the horizontal plane to achieve the matching effect between the window 11 and the pipeline at the valve outlet.

[0047] Of course, those skilled in the art will recognize that the present invention is not limited to the details of the exemplary embodiments described above, but also includes the same or similar structures that can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0048] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0049] The technologies, shapes, and structures not described in detail in this invention are all known technologies.

Claims

1. An orifice plate regulating gate valve, characterized in that: The valve includes an offset valve seat, which includes a valve seat body (10), and the cylindrical cavity of the valve seat body (10) forms a window (11) through which the medium can pass. The window (11) is an eccentric channel, and the eccentric distal end (11a) of the window (11) is located on the side where the valve stem is located. It also includes a valve body (20), on which a valve cavity for fluid passage is arranged through, and a valve seat body (10) with the window (11) is arranged coaxially inside the valve cavity; it also includes a valve plate (30), which is driven by a valve stem (50) with a power source (40) to perform linear reciprocating motion along the radial direction of the valve cavity; a forced sealing wedge (60) is also arranged inside the valve cavity, and a fitting gap is formed between the forced sealing wedge (60) and the valve seat body (10) to allow the valve plate (30) to be engaged and positioned, so that after the valve plate (30) is engaged in the fitting gap, the pressure of the forced sealing wedge (60) and the valve seat body (10) can press the valve plate (30) against the fitting sealing surface of the valve seat body (10); The forced sealing wedge (60) is shaped like a cylindrical pin with its axis parallel to the axis of the valve stem (50).

2. The orifice plate regulating gate valve according to claim 1, characterized in that: A cross-section is made along the radial direction of the valve seat body (10), and the cross-sectional shape of the window (11) is lip-shaped, rectangular, N-shaped, C-shaped, or circular.

3. The orifice plate regulating gate valve according to claim 2, characterized in that: When the cross-sectional shape of the window (11) is lip-shaped, N-shaped, or C-shaped, the arc formed by the eccentric distal end (11a) of the window (11) on the cross-section and the arc formed by the outer wall of the valve seat body (10) on the cross-section constitute a concentric circle structure.

4. The orifice plate regulating gate valve according to claim 1, characterized in that: The forced sealing wedge (60) is provided with a guide chamfer (61), and the valve plate (30) is provided with a matching chamfer (31) with the same angle as the guide chamfer (61), so that after the valve plate (30) is inserted into the fitting gap, the guide chamfer (61) and the matching chamfer (31) form a surface-fitting wedge-shaped pressing fit.

5. The orifice plate regulating gate valve according to claim 1, characterized in that: The valve outlet of the valve cavity has an outwardly flared horn-shaped structure, and the liquid inlet of the valve outlet and the liquid outlet of the window (11) on the valve seat body (10) are smoothly transitioned.

6. The orifice plate regulating gate valve according to claim 1, characterized in that: On an axial section that coincides with both the valve stem (50) axis and the valve cavity axis, the angle between the lower straight line (21) of the valve outlet and the horizontal plane is greater than the angle between the upper straight line (22) and the horizontal plane.

7. The orifice plate regulating gate valve according to claim 1, characterized in that: On an axial section that coincides with both the axis of the valve stem (50) and the axis of the valve cavity, the lowest point of the window (11) is set at the same height as the top surface of the forced sealing wedge (60).

8. The orifice plate regulating gate valve according to claim 1, characterized in that: Both the valve plate (30) and the valve seat body (10) are treated with wear-resistant materials.

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