A slurry redundant check valve

Abstract

The technical solution of the present invention discloses a slurry redundant check valve, including a main valve body formed by splicing a first high-temperature heating jacket and a second high-temperature heating jacket; a medium flow channel and a valve cavity are formed in the main valve body in a cross- and through-shaped manner; a main valve core assembly is installed on the first high-temperature heating jacket, and the valve core of the main valve core assembly is inserted into the valve cavity; a secondary valve core assembly is installed on the second high-temperature heating jacket, and the valve core of the secondary valve core assembly is inserted into the valve cavity; a heat medium inlet flange and a first heat medium outlet flange are installed on the first high-temperature heating jacket; a second heat medium outlet flange is installed on the second high-temperature heating jacket; the medium flow channel is blocked when the valve core of the main valve core assembly and the valve core of the secondary valve core assembly are docked. The present invention sets a heat medium inlet and outlet flange, and the main valve body adopts a high-temperature steam heating jacket design. High-temperature steam is introduced into the outer wall of the valve body, the inner cavity of the damping tube, and the stuffing box for heating, so as to balance the temperature of the inner and outer walls of the valve body and improve the thermodynamic performance of the valve body.

Description

Technical Field

[0001] The invention relates to the technical field of check valves, and in particular to a slurry redundant check valve. Background Art

[0002] Existing redundant check valves for slurry generally include a main valve body, a main valve core assembly, a secondary valve core, a valve cover, a bracket, a packing seal, a high-temperature heating jacket, a positive hand wheel, and a secondary hand wheel. The purpose of installing a check valve at the pump outlet is mainly to prevent the pressurized fluid in the outlet pipe from backflowing due to sudden pump stoppage, causing damage to the pump impeller or loosening of the cap. Check valves should be installed where the process does not allow fluid backflow and where the pump outlet flow rate is large or the pressure is high. Due to the high concentration of the slurry medium and poor fluidity, the traditional check valve structure valve disc is easy to get stuck, and the opening and closing are not sensitive and difficult to reset, which affects the normal circulation of the slurry medium. Summary of the invention

[0003] In order to solve the above technical problems, the technical solution of the present invention provides a slurry redundant check valve, which includes:

[0004] A main valve body formed by splicing a first high-temperature heating jacket and a second high-temperature heating jacket;

[0005] A medium flow channel and a valve cavity are formed in a cross and through manner in the main valve body;

[0006] The first high-temperature heating jacket is equipped with a main valve core assembly, and the valve core of the main valve core assembly is inserted into the valve cavity;

[0007] The second high-temperature heating jacket is installed with an auxiliary valve core assembly, and the valve core of the auxiliary valve core assembly is inserted into the valve cavity;

[0008] The first high-temperature heating jacket is provided with a heat medium inlet flange and a first heat medium outlet flange;

[0009] The second high-temperature heating jacket is provided with a second heat medium outlet flange;

[0010] When the valve core of the main valve core assembly is connected to the valve core of the auxiliary valve core assembly, the medium flow channel is blocked.

[0011] Optionally, the main valve core assembly includes a main valve housing connected to the port of the valve cavity located on the first high-temperature heating jacket, a main valve stem installed in the main valve housing, a main handwheel connected to the main valve stem screw, a damping tube located in the valve cavity and fixed to the end of the valve stem, and a spring installed inside the damping tube and sleeved outside the main valve stem.

[0012] Optionally, the auxiliary valve core assembly includes an auxiliary valve housing connected to the port of the valve cavity located on the second high-temperature heating jacket, an auxiliary valve stem installed in the auxiliary valve housing, and an auxiliary hand wheel connected to the auxiliary valve stem screw, the auxiliary valve stem coincides with the axis of the main valve stem, and the auxiliary valve stem blocks the medium flow channel when it is docked with the damping tube.

[0013] Optionally, the surface of the damping tube facing the auxiliary valve stem is spherical, the surface of the auxiliary valve stem facing the damping tube is a concave spherical surface, and the auxiliary valve stem and the damping tube are butted against each other through the spherical and concave spherical surfaces.

[0014] Optionally, the damping tube is installed with an interference fit on the inner wall of the valve cavity, and the auxiliary valve stem is installed with a clearance fit on the inner wall of the valve cavity.

[0015] Optionally, the damping tube is a rotating corrugated damping tube having an outer surface with a continuous U-shaped groove structure.

[0016] Optionally, two ends of the spring respectively abut against the top and bottom of the damping tube.

[0017] Optionally, the heat medium inlet flange, the first heat medium outlet flange and the second heat medium outlet flange are connected through channels in the main valve body; a stuffing box is provided in the main valve body where the first and second heat medium outlet flanges are connected, a damping tube inner cavity is provided in the main valve body where the damping tube and the valve cavity are located, and the heat medium inlet flange is connected to the outer wall of the valve body in the main valve core assembly.

[0018] Optionally, the medium flow channel is in a Z-shape in the main valve body.

[0019] The beneficial effects of the technical solution of the present invention are:

[0020] The present invention arranges heat medium inlet and outlet flanges, and the main valve body adopts a high-temperature steam heating jacket design. High-temperature steam is introduced into the outer wall of the valve body, the inner cavity of the damping tube and the stuffing box for heating, so as to balance the temperatures of the inner and outer walls of the valve body and improve the thermodynamic properties of the valve body.

[0021] The main valve core assembly adopts a damping tube with a bellows balance element damping design. If the pipeline pressure is unstable or fluctuates greatly, the multi-layer bellows has a strong ability to compensate displacement, reduce vibration and noise, and stabilize pressure. The metal bellows is designed as a rotating structure, and the rotating bellows seal has a self-cleaning centrifugal effect, which reduces slurry deposition at the "U-shaped" of the bellows and coking on the inside.

[0022] Setting a spring in the damping tube can improve the sealing performance under high temperature and high pressure conditions. The contact bellows seal adopts a larger compression amount. The performance of the bellows under high temperature external load is significantly different from that under normal temperature external load. At high temperature, the deformation of the bellows increases with time and may cause axial instability, and the preload force to improve the seal gradually decreases. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of a slurry redundant check valve in an embodiment of the present invention;

[0024] Figure 2 is a cross-sectional view of a slurry redundant check valve in an embodiment of the present invention;

[0025] Figure 3 Schematic diagram of the structure of the damping tube in an embodiment of the present invention. DETAILED DESCRIPTION

[0026] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0027] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0028] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0030] See also Figure 1 , Figure 2 and Figure 3 As shown, a slurry redundant check valve of an embodiment is shown, which includes a main valve body spliced ​​by a first high-temperature heating jacket 1 and a second high-temperature heating jacket 2; a medium flow channel 20 and a valve cavity 30 are formed in the main valve body in a cross- and through-shaped manner; the first high-temperature heating jacket 1 is equipped with a main valve core assembly 3, and the valve core of the main valve core assembly 3 is inserted into the valve cavity 30; the second high-temperature heating jacket 2 is equipped with an auxiliary valve core assembly 4, and the valve core of the auxiliary valve core assembly 4 is inserted into the valve cavity 30; a heat medium inlet flange 5 and a first heat medium outlet flange 6 are installed on the first high-temperature heating jacket 1; a second heat medium outlet flange 7 is installed on the second high-temperature heating jacket 2; the medium flow channel 20 is blocked when the valve core of the main valve core assembly 3 is connected to the valve core of the auxiliary valve core assembly 4.

[0031] In this embodiment, the main valve core assembly 3 includes a main valve housing 31 connected to the port of the valve cavity 30 located on the first high-temperature heating jacket 1, a main valve stem 32 installed in the main valve housing 31, a main hand wheel 34 screw-connected to the main valve stem 32, a damping tube 33 located in the valve cavity 30 and fixed to the end of the valve stem 32, and a spring 10 installed inside the damping tube 33 and sleeved outside the main valve stem 32. The damping tube 33 is made of metal, such as stainless steel, nickel-based alloy, etc.

[0032] In this embodiment, the auxiliary valve core assembly 4 includes an auxiliary valve housing 41 connected to the port of the valve cavity 30 located on the second high-temperature heating jacket 2, an auxiliary valve stem 42 installed in the auxiliary valve housing 41, and an auxiliary hand wheel 43 screw-connected to the auxiliary valve stem 42. The auxiliary valve stem 42 coincides with the axis of the main valve stem 32, and the auxiliary valve stem 42 blocks the medium flow channel 20 when docking with the damping tube 33.

[0033] In this embodiment, the surface of the damping tube 33 facing the auxiliary valve stem 42 is spherical 331, and the surface 421 of the auxiliary valve stem 42 facing the damping tube 33 is a concave spherical surface (not shown). The auxiliary valve stem 42 and the damping tube 33 are connected through the spherical and concave spherical surfaces.

[0034] In this embodiment, the damping tube 33 is installed with an interference fit to the inner wall of the valve cavity 30 , and the auxiliary valve stem 42 is installed with a clearance fit to the inner wall of the valve cavity 30 .

[0035] In this embodiment, the damping tube 33 is a rotating corrugated damping tube having a continuous U-shaped groove structure 332 on the outer surface.

[0036] In this embodiment, two ends of the spring 10 respectively abut against the top and bottom of the damping tube 33 , and the material of the spring 10 is INCONEL.

[0037] In this embodiment, the heat medium inlet flange 5, the first heat medium inlet flange 6 and the first heat medium outlet flange 7 are connected in the channel 8 outside the main valve body; the main valve body is connected to the second heat medium outlet flange at a stuffing box 35, and the main valve body is located at the damping tube 33 and the valve cavity 30 is a damping tube inner cavity 36, and the heat medium inlet flange 5 is connected 36 to the inner wall of the damping tube 33 in the main valve core assembly 3.

[0038] In this embodiment, the medium flow channel 20 is in a Z-shape in the main valve body.

[0039] The characteristics and functions of the present invention can be further understood through the following description.

[0040] In order to further improve the flow characteristics of the slurry medium in this embodiment, the valve flap assembly is sensitive to opening and closing, and the main valve body adopts a high-temperature steam heating jacket design. High-temperature steam is introduced into the outer wall of the valve body, the inner cavity of the damping tube and the stuffing box for heating, so as to balance the temperature of the inner and outer walls of the valve body and improve the thermodynamic properties of the valve body.

[0041] The main valve core assembly adopts a bellows balance element damping design. If the pipeline pressure is unstable or fluctuates greatly, the multi-layer bellows has a strong ability to compensate displacement, reduce vibration and noise, and stabilize pressure. The metal bellows is designed as a rotating structure, and the rotating bellows seal has a self-cleaning centrifugal effect, which reduces slurry deposition at the "U-shaped" part of the bellows and coking on the inside.

[0042] Setting a spring in the damping tube can improve the sealing performance under high temperature and high pressure conditions. The contact bellows seal uses a larger compression amount. The performance of the bellows under high temperature external load is significantly different from that under normal temperature external load. At high temperature, the deformation of the bellows increases with time and may cause axial instability, and the preload force to improve the seal gradually decreases. As a sealing redundancy design, the spring of INCONEL material can provide a constant preload even when working at ultra-high temperatures.

[0043] Reliability Redundancy Design

[0044] Main handwheel: Rotate regularly within a certain opening range to ensure normal operation. The valve stem head is a raised spherical surface, and the support surface is a flat surface. The axial force of the valve stem acts evenly and effectively on the valve core, and the gap between the valve stem and the valve core assembly allows it to rotate within a certain range. It is forbidden to completely close the check valve during the operation of the pump to avoid interference with the flow.

[0045] Auxiliary hand wheel: When the pressure, flow, flow rate and other parameters after the valve are abnormal, after confirming that the main hand wheel is fully opened, the auxiliary hand wheel is switched on and off in full stroke several times to open the valve when the main valve core component is blocked by solid deposition. The auxiliary valve core is a concave spherical surface, which cooperates with the arc surface of the main valve core. The axial force is uniform and the top opening force can be adjusted according to the input force of the auxiliary hand wheel.

[0046] The above are only preferred embodiments of the present invention, and are not intended to limit the implementation methods and protection scope of the present invention. Those skilled in the art should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A slurry redundant check valve, It is characterized in that include: A main valve body formed by splicing a first high-temperature heating jacket and a second high-temperature heating jacket; A medium flow channel and a valve cavity are formed in a cross and through manner in the main valve body; The first high-temperature heating jacket is equipped with a main valve core assembly, and the valve core of the main valve core assembly is inserted into the valve cavity; The second high-temperature heating jacket is installed with an auxiliary valve core assembly, and the valve core of the auxiliary valve core assembly is inserted into the valve cavity; The first high-temperature heating jacket is provided with a heat medium inlet flange and a first heat medium outlet flange; The second high-temperature heating jacket is provided with a second heat medium outlet flange; When the valve core of the main valve core assembly is connected to the valve core of the auxiliary valve core assembly, the medium flow channel is blocked; The main valve core assembly includes a main valve housing connected to the port of the valve cavity located on the first high-temperature heating jacket, a main valve stem installed in the main valve housing, a main hand wheel connected to the main valve stem screw, a damping tube located in the valve cavity and fixed to the end of the main valve stem, and a spring installed inside the damping tube and sleeved outside the main valve stem; The auxiliary valve core assembly includes an auxiliary valve housing connected to the port of the valve cavity on the second high-temperature heating jacket, an auxiliary valve stem installed in the auxiliary valve housing, and an auxiliary hand wheel connected to the auxiliary valve stem screw, the auxiliary valve stem coincides with the axis of the main valve stem, and the auxiliary valve stem blocks the medium flow channel when docking with the damping tube; The surface of the damping tube facing the auxiliary valve stem is spherical, the surface of the auxiliary valve stem facing the damping tube is a concave spherical surface, and the auxiliary valve stem and the damping tube are butted against each other through the spherical and concave spherical surfaces; The damping tube is installed with interference fit on the inner wall of the valve cavity, and the auxiliary valve stem is installed with clearance fit on the inner wall of the valve cavity; The damping tube is a rotating corrugated damping tube with a continuous U-shaped groove structure on the outer surface.

2. The slurry redundant check valve according to claim 1, It is characterized in that Two ends of the spring are respectively against the top and the bottom of the damping tube.

3. The slurry redundant check valve according to claim 1, It is characterized in that The heat medium inlet flange, the first heat medium outlet flange and the second heat medium outlet flange are connected through the channels in the main valve body; a stuffing box is provided in the main valve body where the first and second heat medium outlet flanges are connected, the damping tube inner cavity is provided in the main valve body where the damping tube and the valve cavity are located, and the heat medium inlet flange is connected to the outer wall of the valve body in the main valve core assembly.

4. The slurry redundant check valve according to claim 1, It is characterized in that The medium flow channel is in a Z-shape in the main valve body.

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