Axial-flow type check valve with improved valve clack support for gas storage

Abstract

A right port of a valve seat (5) abuts against the outer edge, axially bulging towards the left side, of a valve clack (9), a middle shaft part on the right side of the valve clack (9) rightwards extends out of a first guide rod (12), the right end of the first guide rod (12) is coaxially fixed in a guide sleeve (11) installed on the left side of the middle shaft part in a supporting seat (14), and the middle section of the first guide rod (12) is sleeved with a spring (13). The left end and the right end of the spring (13) abut against the right end face of the valve clack (9) and the outer edge of the left section of the guide sleeve (11) respectively, and the left section of the supporting seat (14) is a conical opening. Due to the unique structural design, resistance and pressure loss are small when fluid passes through, the flow coefficient is large, and the valve is suitable for large-flow medium pipelines. No water hammer impact phenomenon exists, dynamic response is fast, opening and closing are smooth and stable, and the outstanding low-noise and sealing performance is achieved. And sealing surface leakage caused by poor centering performance of the valve clack and uneven stress of a sealing pair due to the gravity factor is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of one-way valves classified as IPC F16K 15 / 00, and in particular relates to an axial flow check valve with an improved valve flap support structure for use in gas storage working conditions. Background Art

[0002] With the continuous development of the energy industry, the construction and operation of gas storage facilities have gradually increased the demand for fluid control components such as check valves. Check valves play a vital role in gas storage facilities. They are mainly used to control the flow direction of gas in the pipeline and prevent gas backflow and reflux.

[0003] Axial flow check valve is an automatic valve, mainly used in one-way flow medium pipeline, to prevent the medium from flowing in the opposite direction. Structural features include: The main structure of the axial flow check valve includes valve body, valve disc, spring and valve seat. The inner surface of the valve body, guide cover, valve disc and other flow surfaces are designed in streamline shape to reduce fluid resistance and avoid turbulence.

[0004] The working principle of the axial flow check valve includes: the opening and closing of the valve disc is determined by the pressure difference between the inlet and outlet of the valve. When the inlet pressure is greater than the sum of the outlet pressure and the spring force, the valve disc opens and the medium can pass through. When the medium flows back or the inlet pressure is less than the set value, the valve disc will close under the action of the spring force to prevent the medium from flowing back. The valve disc is usually installed with a buffer shock-absorbing spring. When the medium flows downstream, the spring plays a buffering role to avoid direct collision between the valve disc and the valve body. The valve seat adopts a combined sealing structure of hard seal and soft seal, which can effectively reduce the impact noise when the valve disc and the valve seat are in contact, and improve the sealing performance.

[0005] Axial flow check valves can be divided into various forms such as sleeve type, disc type, ring disc type, etc. according to the different disc structures. When selecting an axial flow check valve, factors such as the properties of the medium, working pressure, temperature range, and pipeline size must be considered.

[0006] Traditional axial flow check valves often get stuck during use. When the fluid is small or the flow rate is low, the valve disc may not open completely, which may further cause unstable fluid flow, loud noise, severe water hammer and other faults. Utility Model Content

[0007] The technical problem to be solved by the utility model is that in view of the above problems and technical requirements, the utility model proposes an axial flow check valve with improved valve disc support for a gas storage tank, which overcomes and avoids the jamming phenomenon of the valve during use by improving and optimizing the structure of the supports at both ends of the valve disc and the valve shaft.

[0008] To this end, the utility model includes: a valve body, a cap, a valve seat, a valve flap, a guide sleeve, a first guide rod, a spring and a support seat. The valve body is installed horizontally, and an axial hole is opened axially in the valve body, and the flow direction is from left to right; the support seat includes a tapered opening of the left section and a rear hollow support frame of the right section as an integral structure. A cap is installed in the left end of the shaft hole. The cap is cylindrical and has a front hollow support frame in the middle of the inner wall. The right port of the cap is sleeved with the left port of the valve seat. The right port of the valve seat is close to the outer edge of the valve disc bulging axially to the left. The middle axis of the right side of the valve disc extends the first guide rod to the right. The right end of the guide rod is coaxially fixed in the guide sleeve installed on the left side of the middle axis in the support seat. The middle section of the first guide rod is outer-circuited with a spring, and the left and right ends of the spring are respectively close to the right end face of the valve disc and the outer edge of the left section of the guide sleeve. The left section of the support seat is a tapered mouth, and the right end of the support seat has a reduced diameter pipe mouth. The support seat is centrally installed in the middle of the right end of the valve body through the rear hollow support frame. The inner wall of the support seat has a transition surface with a gradually reduced inner diameter from left to right and a continuous and smooth transition curve.

[0009] Wherein, the inner wall of the shaft hole in the valve body corresponding to the outer wall of the support seat is bulged, that is, the inner diameter of the middle part of the shaft hole is larger than the average inner diameter of the shaft hole.

[0010] The second guide rod is inserted into the middle part of the front hollow support frame in the cap through a locking nut, and the left end of the second guide rod extends to the left side of the front hollow support frame, and a round nut and a thrust washer are installed between the left section of the locking nut and the right end of the guide sleeve; the guide sleeve is connected to the left; the left end of the guide sleeve is closed and the outer edge is smooth, and the right end of the guide sleeve is connected to the middle part of the left end face of the valve disc through the first guide rod.

[0011] The guide sleeve and the outer sleeve of the right end of the spring are embedded with an adjusting pad.

[0012] The outer wall of the top of the support seat is provided with a water hole.

[0013] The upper edge of the valve body is fixedly installed with a rotating lifting ring to facilitate lifting and transportation. The bottom of the valve body is installed with a supporting foot and fixed with bolts and washers.

[0014] Furthermore, in order to achieve the above-mentioned purpose, the present invention is configured as follows:

[0015] In particular, the outer wall of the cap is fixed to the inner wall of the valve body by a first fixing screw; the cap is tightened and connected to the left end edge of the second fixing screw by a second fixing screw through screw holes distributed on the edge of the front hollow support frame; further, a retaining ring, an O-ring and a toothed gasket are sequentially lined between the outer wall of the valve seat and the inner wall of the axial hole of the valve body.

[0016] In particular, the valve disc has a teardrop-shaped structure.

[0017] Compared with the prior art, the utility model has the following beneficial effects: the unique structural design makes the resistance and pressure loss of the fluid smaller when passing through, the flow coefficient is large, and it is suitable for large flow medium pipelines. There is no water hammer impact phenomenon, the dynamic response is fast, the opening and closing are smooth and stable, and it has outstanding low noise and sealing performance. It saves energy, has good sealing performance, is easy to install and operate, has a short opening and closing stroke, a compact structure, and a long service life. It is widely used to prevent the backflow of the medium. The combined sealing structure is adopted to ensure the sealing performance when the valve is closed. Avoid the sealing surface leakage caused by the poor neutrality of the valve disc caused by gravity factors and the uneven force of the sealing pair. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The following drawings are for illustration only and should not be construed as limiting the present invention in any way. By referring to the following drawings, readers can understand the embodiments of the present invention and further understand the advantages and technical features of the present invention.

[0019] Figure 1 This is a schematic structural diagram of Example 1 of the utility model.

[0020] Figure 2 for Figure 1 Schematic diagram of the local structure of part I.

[0021] Figure 3 for Figure 1 Schematic diagram of the local structure of Part II.

[0022] Figure 4 for Figure 1 Schematic diagram of the local structure of part III.

[0023] Reference numerals include:

[0024] 1-valve body, 2-cap, 3-first set screw, 4-second set screw, 5-valve seat, 6-retaining ring, 7-O-ring, 8-toothed pad, 9-valve disc, 10-adjusting pad, 11-guide sleeve, 12-first guide rod, 13-spring, 14-support seat, 15-rotating lifting ring, 16-support foot, 17-bolt, 18-washer, 19-locking nut, 20-round nut, 21-thrust washer, 22-guide sleeve, 23-second guide rod; 201-front hollow support frame, 1401-conical mouth, 1402-rear hollow support frame. DETAILED DESCRIPTION

[0025] It should be noted that:

[0026] The terms "comprise", "comprises", "having" and any variations thereof are intended to cover other possible options under the same logic that are not listed. For example, a process, method, system, product or apparatus that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units that are not explicitly listed or inherent to these processes, methods, products or apparatus.

[0027] In the description of the present utility model, the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the utility model product is usually placed when in use, and are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third" and the like are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0028] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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 indirectly connected 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 order to enable those skilled in the art to better understand the scheme of the utility model, the technical scheme in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only an embodiment of a part of the utility model, rather than all the embodiments.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by ordinary technicians in the field to which the utility model belongs. When there is a conflict, the definitions in this specification shall prevail.

[0031] The principle of the utility model is that the straight-through axial flow symmetrical structure of the axial flow check valve and the streamlined design of the flow surface make it have incomparable advantages compared with the check valve of the traditional structure. The axial flow check valve with improved valve disc 9 support mainly involves the optimization of the valve disc support structure to improve the performance and service life of the check valve.

[0032] The utility model comprises: a valve body 1, a valve cap 2, a valve seat 5, a valve flap 9, a guide sleeve 11, a first guide rod 12, a spring 13 and a support seat 14.

[0033] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0034] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

[0035] The content of the present invention can be more easily understood by selecting the following preferred implementation methods and embodiments of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by ordinary technicians in the field to which the present invention belongs. When there is a conflict, the definition in this specification shall prevail.

[0036] Embodiment 1: As attached Figure 1 , 2 As shown in 3 and 4, the valve body 1 is installed horizontally, and an axial hole is axially opened in the valve body 1, and the flow direction is from left to right; a cap 2 is installed in the left end of the axial hole, and the cap 2 is cylindrical and has a front hollow support frame 201 in the middle of the inner wall, and the right port of the cap 2 is sleeved with the left port of the valve seat 5, and the right port of the valve seat 5 is close to the outer edge of the valve disc 9 axially bulging to the left, and the middle axis of the right side of the valve disc 9 extends to the right The first guide rod 12, the right end of the first guide rod 12 is coaxially fixed to the inner middle axis of the support seat 14 In the guide sleeve 11 installed on the left side of the valve body, the middle section of the first guide rod 12 is connected to the spring 13, and the left and right ends of the spring 13 are respectively close to the right end face of the valve disc 9 and the outer edge of the left section of the guide sleeve 11. The left section of the support seat 14 is a tapered mouth, and the right end of the support seat 14 has a reduced diameter pipe mouth. The support seat 14 is centered and installed in the middle of the right end of the valve body 1 through the rear hollow support frame 1402. The inner wall of the support seat 14 has a transition surface with a gradually reduced inner diameter from left to right and a continuous and smooth transition curve.

[0037] In the above description, the guide sleeve 11 and the right end of the spring 13 are embedded and installed with the adjusting pad 10.

[0038] In the above description, a water hole is opened on the outer wall of the top of the support seat 14 .

[0039] In the above description, the inner wall of the shaft hole in the valve body 1 corresponding to the outer wall of the support seat 14 is bulged, that is, the inner diameter of the middle part of the shaft hole is larger than the average inner diameter of the shaft hole.

[0040] In the above, the second guide rod 23 is inserted into the middle part of the front hollow support frame 201 in the cap 2 through the locking nut 19, and the left end of the second guide rod 23 extends to the left side of the front hollow support frame 201, and the round nut 20 and the thrust washer 21 are set between the left section of the locking nut 19 and the right end of the guide sleeve 22; the guide sleeve 22 is connected to the left; the left end of the guide sleeve 22 is closed and the outer edge is smooth, and the right end of the guide sleeve 22 is connected to the middle part of the left end face of the valve disc 9 through the other section of the first guide rod 12.

[0041] In the embodiment of the utility model, a rotating lifting ring 15 is fixedly installed on the upper edge of the valve body 1 to facilitate lifting and transportation. A supporting foot 16 is installed at the bottom of the valve body 1 and fixed by bolts 17 and washers 18.

[0042] In the embodiment of the utility model, the outer wall of the cap 2 is fixed to the inner wall of the valve body 1 by the first tightening screw 3; the cap 2 is connected to the left end face edge of the second tightening screw 4 by tightening with the second tightening screw 4 through the screw holes distributed on the edge of the front hollow support frame; further, a retaining ring 6, an O-ring 7, and a toothed pad 8 are sequentially lined between the outer wall of the valve seat 5 and the inner wall of the axial hole of the valve body 1.

[0043] In the embodiment of the utility model, further, the support seat 14 includes the tapered opening 1401 of the left section and the rear hollow support frame 1402 of the right section as an integral structure, which is formed by one-time casting.

[0044] In the embodiment of the utility model, further, a better vibration reduction effect is obtained by using the spring 13 and fixing the support foot 16, the bolt 17 and the washer 18, thereby effectively reducing the vibration and noise during the operation of the valve.

[0045] In the embodiment of the utility model, the valve can be opened under extremely low pressure difference. To open the valve, it is mainly necessary to overcome the resistance of the spring 13 which generates the initial sealing pressure. The stiffness of the spring 13 cannot be too large. The lower the stiffness of the spring 13, the lower the opening pressure. However, if the stiffness of the spring 13 is low, the initial seal may not be established when closing, resulting in leakage. Therefore, the design and selection of the spring 13 is very critical.

[0046] The implementation principle of this embodiment is:

[0047] (1) Small fluid resistance and fast opening and closing: The Venturi structure design inside the valve body 1, with precise calculation and design, ensures that the flow area of ​​the flow channel is sufficient and consistent, and the critical flow velocity required is much smaller than the critical flow velocity required by the traditional check valve. The valve disc 9 is designed in a water drop-shaped structure, with small pressure loss, stable flow state, no cavitation, small pressure drop, and short stroke of the valve disc 9, which can achieve fast opening and closing.

[0048] (2) No noise: The valve disc 9 is equipped with a buffer spring 13. When the medium flows downstream, the valve disc 9 opens and the medium flows through the inner cavity channel of the valve body. When the medium pushes the valve disc 9 open, the spring 13 plays a buffering effect, avoiding the collision and vibration between the valve disc 9 and the valve body 1 when the ordinary check valve is opened. The opening and closing of the valve disc 9 is always in a dynamic balance system, the valve operates in a balanced manner, and the backflow speed at the moment of closing is small, which greatly reduces noise and water hammer effect.

[0049] (3) Excellent sealing performance: The valve disc 9 component has been analyzed and calculated by finite element analysis, which reduces its inertia while ensuring its strength, reduces the impact force of the valve disc 9 on the valve seat 5 when it is closed, and can effectively reduce the leakage caused by the damage of the sealing pair. At the same time, the special surface hardening treatment of the guide sleeve and the valve disc 9 shaft makes the friction coefficient extremely low, and the wear of the guide matching parts is extremely small, which overcomes the jamming phenomenon that often occurs during the use of similar valves. The structural design of the extended guide can also avoid the defects of poor centering of the valve disc 9 caused by gravity, uneven force on the sealing pair, and inconsistent matching parts of the sealing pair between two actions, which affect the sealing performance. The thrust of the spring 13 enables the valve disc 9 to be in the closed position even when there is no medium pressure, so that the sealing pair is always in a good matching and sealing state.

[0050] (4) Low operating energy consumption: The fluid only needs to overcome the tension of the spring 13, the gravity of the valve disc 9 and the friction of the guide sleeve 11 to open. In the horizontal state, the minimum opening pressure is low, which greatly reduces the starting load of the pump or compressor and protects the safe operation of the main equipment.

[0051] (5) Long-term maintenance-free operation: The valve disc 9, valve seat 5, guide sleeve 11, and spring 13 are all made of high-strength precipitation-hardened stainless steel with surface hardening treatment. Each matching component has been strictly calculated to ensure that the stress it is subjected to is at a low level, so that the parts will not be fatigued and damaged during long-term operation of the valve. There are no non-metallic parts in the valve to avoid the defect of valve performance degradation caused by the aging of non-metallic materials. Therefore, this valve can be operated for a long period of time without maintenance.

[0052] (6) Flexible installation: Compared with other types of check valves of the same size, axial flow check valves are light in weight, have a small installation location, and can be installed horizontally or vertically.

[0053] In this embodiment, the axial flow check valve with improved support of the valve disc 9 needs to be comprehensively optimized and designed from multiple aspects. The performance and service life of the axial flow check valve can be further improved by enhancing the stability of the valve disc support, optimizing the coordination between the valve disc and the valve seat, improving the spring design, considering the characteristics of the fluid, adding a buffer device, and performing numerical simulation and optimization design. The expansion principle also includes:

[0054] 1) Enhance the stability of the support of the valve flap 9: In order to prevent the valve flap 9 from deforming under high pressure, a thicker material or an additional support structure can be used, such as using a valve flap 9 with a support guide shaft. This design can reduce the possibility of the valve flap 9 sagging due to its own weight when closed, ensure the centering of the valve flap 9 and the valve seat 5, and thus improve the sealing performance.

[0055] 2) Optimize the fit between the valve flap 9 and the valve seat 5: The fit accuracy between the valve flap 9 and the valve seat 5 directly affects the sealing effect of the check valve. Therefore, the machining accuracy of the valve flap 9 and the valve seat 5 can be improved to ensure that they fit tightly and reduce the possibility of internal leakage. At the same time, wear-resistant and corrosion-resistant materials are selected to make the valve flap 9 and the valve seat 5 to extend their service life.

[0056] 3) Improve the design of spring 13: Spring 13 plays the role of automatic reset and auxiliary sealing in the axial flow check valve. The design parameters of spring 13, such as stiffness and preload, can be optimized to ensure that the valve can generate sufficient sealing force when closed, while avoiding excessive resistance to the fluid when opened.

[0057] 4) Consider the characteristics of the fluid: For different fluid media, it is necessary to select suitable valve disc 9 materials and sealing structures. For example, for fluids containing solid particles, it is necessary to select materials with good wear resistance and design a sealing structure that is easy to clean and replace.

[0058] 5) Add buffer device: In order to avoid the water hammer effect and cavitation caused by the check valve closing too fast, a buffer device such as an accumulator or a pressure reducing valve can be installed upstream of the valve. These devices can absorb the impact energy of the fluid, reduce the vibration and noise of the valve, and increase the service life.

[0059] 6) Perform numerical simulation and optimize design: Use numerical simulation technology to simulate and analyze the flow field, pressure distribution and disc movement of the check valve. By optimizing the design parameters and structural form, the performance and service life of the check valve can be further improved. For example, the shape and streamlined design of the disc 9 can be optimized to reduce fluid resistance; the stiffness and preload of the spring 13 can be adjusted to improve the opening and closing characteristics of the valve, etc.

[0060] Application fields of this embodiment: widely used in the fields of petroleum, chemical industry, electricity, water supply, etc., especially in the occasions where it is necessary to prevent the backflow of the medium. In petrochemical plants, it is often used to control the flow direction of chemical fluids to prevent accidents. In water supply systems, it can effectively prevent the backflow of water in the pipeline and ensure the reliability and safety of water supply.

[0061] Based on the above embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention, so as to avoid exhaustively listing all implementation methods that are unnecessary and impossible to list comprehensively.

Claims

1. An axial flow check valve with improved valve disc support for a gas storage, comprising a valve body (1), a cap (2), a valve seat (5), a valve disc (9), a guide sleeve (11), a first guide rod (12), a spring (13) and a support seat (14); characterized in that: The valve body (1) is installed horizontally, and an axial hole is opened axially in the valve body (1), and the flow direction is from left to right; the support seat (14) includes a tapered mouth (1401) of its left section and a rear hollow support frame (1402) of its right section as an integral structure; a cap (2) is installed in the left end of the axial hole, and the cap (2) is cylindrical and has a front hollow support frame (201) in the middle of the inner wall; the right port of the cap (2) is sleeved with the left port of the valve seat (5), and the right port of the valve seat (5) is close to the outer edge of the valve disc (9) axially bulging to the left, and the middle axis of the right side of the valve disc (9) extends a first guide rod (12) to the right, and the first guide rod ( The right end of the first guide rod (12) is coaxially fixed in the guide sleeve (11) installed on the left side of the central axis of the support seat (14). The middle section of the first guide rod (12) is connected to the spring (13). The left and right ends of the spring (13) are respectively close to the right end face of the valve disc (9) and the outer edge of the left section of the guide sleeve (11). The left section of the support seat (14) is a conical opening. The right end of the support seat (14) has a reduced diameter pipe opening. The support seat (14) is centrally installed in the middle of the right end of the valve body (1) through the rear hollow support frame (1402). The inner wall of the support seat (14) has a transitional curved surface with a gradually reduced inner diameter from left to right and a continuous and smooth transition curve.

2. The axial flow check valve with improved valve disc support for gas storage according to claim 1, characterized in that: The inner wall of the shaft hole in the valve body (1) corresponding to the outer wall of the support seat (14) is bulged, that is, the inner diameter of the middle part of the shaft hole is larger than the average inner diameter of the shaft hole.

3. The axial flow check valve with improved valve disc support for gas storage according to claim 1, characterized in that: A rotating lifting ring (15) is fixedly mounted on the upper end edge of the valve body (1).

4. The axial flow check valve with improved valve disc support for gas storage according to claim 1, characterized in that: A second guide rod (23) is inserted into the middle of the front hollow support frame (201) in the cap (2) through a locking nut (19); the left end of the second guide rod (23) extends to the left side of the front hollow support frame (201); and a round nut (20) and a thrust washer (21) are inserted between the left section of the locking nut (19) and the right end of the guide sleeve (22); the guide sleeve (22) is connected to the left; the left end of the guide sleeve (22) is closed and the outer edge is smooth; the right end of the guide sleeve (22) is connected to the middle of the left end face of the valve disc (9) through the first guide rod (12).

5. The axial flow check valve with improved valve disc support for gas storage according to claim 1, characterized in that: The outer wall of the cap (2) is fixed to the inner wall of the valve body (1) by means of a first set screw (3); the cap (2) is connected to the left end face edge of the second set screw (4) by means of a second set screw (4) through screw holes distributed on the edge of the front hollow support frame; a retaining ring (6), an O-ring (7) and a toothed pad (8) are sequentially installed between the outer wall of the valve seat (5) and the inner wall of the shaft hole of the valve body (1).

6. The axial flow check valve with improved valve disc support for gas storage according to claim 1, characterized in that: The valve flap (9) has a water drop-shaped structure.

7. The axial flow check valve with improved valve disc support for gas storage according to claim 1, characterized in that: The right end of the guide sleeve (11) and the spring (13) is fitted with an adjustment pad (10).

8. The axial flow check valve with improved valve disc support for gas storage according to claim 1, characterized in that: The top outer wall of the support seat (14) is provided with a water hole.

9. The axial flow check valve with improved valve disc support for gas storage according to claim 1, characterized in that: A support foot (16) is installed at the bottom of the valve body (1) and fixed by bolts (17) and washers (18).

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