Check valve

Abstract

The utility model provides a check valve which comprises a valve body, a valve cavity is formed in the valve body, and an inlet and an outlet which are communicated with the valve cavity are formed in the two ends of the valve body respectively. The first valve seat and the second valve seat are arranged on the inner side of the inlet and the inner side of the outlet respectively; the guide shaft is connected to the first valve seat and the second valve seat in a sliding manner; the valve clack is connected to the guide shaft; the elastic piece is arranged between the valve clack and the second valve seat, and the valve clack can block the inlet under the action of the elastic piece; the guide shaft is connected to the first valve seat and the second valve seat in a sliding mode, the layout structure of double supports at the two ends of the guide shaft is achieved, the overlong part of the guide shaft is prevented from being in a suspended state, the guide shaft is prevented from being abraded under the action of the bending moment of a cantilever, stable operation of the valve clack is guaranteed, and therefore the sealing reliability of the check valve is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of valve bodies, and more specifically relates to a check valve. Background Art

[0002] At present, the existing check valves include axial flow check valves, which are provided with a guide shaft for supporting the valve disc. The circulating medium will flow in from the inlet. As the guide shaft slides, when the valve disc is pushed open, the circulating medium will flow out from the outlet through the valve body. When the circulating medium flows back, the check valve will not be able to open to block the backflow of the circulating medium. However, the existing check valve design has defects. The stability of supporting the guide shaft in the valve body is poor. Under the impact of the circulating medium, the suspended part of the guide shaft is prone to offset, and the guide shaft is prone to wear under the action of bending moment, resulting in the valve disc being unable to operate smoothly, reducing the reliability of the valve disc seal. Utility Model Content

[0003] The purpose of the utility model is to provide a check valve in view of the deficiencies in the existing technology, so as to solve the problem raised in the above-mentioned background technology that the guide shaft used to support the valve disc in the existing check valve has poor stability in the valve body, and under the impact of the circulating medium, the suspended part of the guide shaft is prone to displacement, resulting in wear of the guide shaft and the inability of the valve disc to operate smoothly, thereby reducing the reliability of the valve disc seal.

[0004] In order to achieve the above object, the utility model provides a check valve, which includes:

[0005] A valve body, wherein a valve cavity is provided inside the valve body, and an inlet and an outlet communicating with the valve cavity are respectively provided at two ends of the valve body;

[0006] a first valve seat and a second valve seat, wherein the first valve seat and the second valve seat are respectively arranged at an inner side of the inlet and an inner side of the outlet;

[0007] A guide shaft, wherein the guide shaft is slidably connected to the first valve seat and the second valve seat;

[0008] a valve flap, the valve flap being connected to the guide shaft;

[0009] An elastic member is disposed between the valve flap and the second valve seat, and the valve flap can block the inlet under the action of the elastic member.

[0010] Preferably, the check valve further comprises:

[0011] A flow guide cover body, wherein the flow guide cover body is connected to the second valve seat, and a flow guide channel is formed between the outer side of the flow guide cover body and the inner side of the valve cavity;

[0012] A first guide sleeve, wherein the first guide sleeve is connected to the inner side of the air guide cover body, the guide shaft passes through the first guide sleeve, and the guide shaft is slidably connected to the first guide sleeve.

[0013] Preferably, the check valve further comprises:

[0014] a second guide sleeve, wherein the second guide sleeve is connected to the first valve seat, the guide shaft passes through the second guide sleeve, and the guide shaft is slidably connected to the second guide sleeve;

[0015] Positioning key: key slots are provided on the inner side of the second guide sleeve and the guide shaft. When the guide shaft passes through the second guide sleeve, the positioning key is arranged in the two key slots, and the positioning key is slidably connected with the key slots of the second guide sleeve.

[0016] Preferably, the check valve also includes a pressure cover, and the pressure cover and the valve disc are both sleeved on the guide shaft. The pressure cover is inserted into a slot between the valve disc and the guide shaft, and at least one annular first sealing groove is provided on the guide shaft at a position for contacting the valve disc, and a first sealing ring is sleeved in the first sealing groove.

[0017] Preferably, the check valve further comprises:

[0018] A valve sleeve, wherein an annular first positioning ridge is disposed on the outer side of the valve sleeve, an annular retaining ridge is disposed on the inner side of the inlet near the outlet, the first positioning ridge is used to fit on the side of the retaining ridge away from the outlet, the first valve seat fits on the valve sleeve, at least one annular second sealing groove is disposed at the position where the first positioning ridge is used to contact the inner side of the inlet, and a second sealing ring is sleeved in the second sealing groove;

[0019] A positioning ring, which is a segmented positioning ring, wherein an annular second positioning ridge is provided on the outer side of the positioning ring, an annular positioning groove is provided on the inner side of the inlet away from the outlet, the second positioning ridge is arranged in the positioning groove, and the positioning ring is in contact with the first valve seat, and the positioning ring and the first valve seat can be connected by fasteners.

[0020] Preferably, the check valve further comprises:

[0021] A fireproof graphite rope, which is wound around the outside of the valve sleeve and arranged between the first positioning ridge and the first valve seat;

[0022] A buffer ring is connected to a side of the valve sleeve close to the outlet, and the buffer ring is used to fit with the valve disc.

[0023] Preferably, the thickness of the valve flap is 0.8 times the thickness of the side wall of the valve body, the side of the valve flap away from the outlet is spherical and is provided with a hard alloy layer, and the side of the valve flap close to the outlet is provided with a plurality of reinforcing ribs.

[0024] Preferably, the inner diameter of the valve cavity gradually decreases along the two ends of the valve body toward the middle of the valve body, and the outer diameter of the guide cover body gradually decreases along one end of the guide cover body toward the other end of the guide cover body, and one end of the guide cover body is arranged in the middle position of the valve cavity.

[0025] Preferably, the check valve further comprises two sleeves, one end of each of the sleeves is connected to one end of the valve body respectively, and both ends of the sleeves are used for welding to two pipes of an external device.

[0026] Preferably, the elastic member is a spring, and the elastic member is sleeved on the guide shaft.

[0027] The utility model provides a check valve, which has the following beneficial effects: the first valve seat and the second valve seat of the check valve are respectively arranged on the inner side of the inlet and the inner side of the outlet of the valve body, and the guide shaft is slidably connected to the first valve seat and the second valve seat, realizing a layout structure with double supports at both ends of the guide shaft, avoiding the excessively long part of the guide shaft from being in a suspended state, avoiding the wear of the guide shaft under the action of the cantilever bending moment, ensuring that the valve disc can operate smoothly, and thus improving the sealing reliability of the check valve.

[0028] Other features and advantages of the present invention will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the present invention.

[0030] Figure 1 A schematic cross-sectional structure diagram of a check valve according to an embodiment of the utility model is shown;

[0031] Figure 2 A cross-sectional and three-dimensional schematic diagram of a check valve according to an embodiment of the utility model is shown. Figure 1 ;

[0032] Figure 3 A cross-sectional and three-dimensional schematic diagram of a check valve according to an embodiment of the utility model is shown. Figure 2 ;

[0033] Figure 4A partial structural diagram of a check valve according to an embodiment of the utility model is shown. Figure 1 ;

[0034] Figure 5 A partial structural diagram of a check valve according to an embodiment of the utility model is shown. Figure 2 ;

[0035] Figure 6 A schematic diagram of a three-dimensional structure of a check valve according to an embodiment of the utility model is shown. Figure 1 ;

[0036] Figure 7 A schematic diagram of a three-dimensional structure of a check valve according to an embodiment of the utility model is shown. Figure 2 ;

[0037] Figure 8 A schematic diagram of the three-dimensional structure of a valve flap of a check valve according to an embodiment of the utility model is shown.

[0038] Description of reference numerals:

[0039] 1. Valve body; 2. First valve seat; 3. Second valve seat; 4. Guide shaft; 5. Valve disc; 6. Elastic member; 7. Guide cover; 8. First guide sleeve; 9. Second guide sleeve; 10. Gland; 11. First sealing ring; 12. Valve sleeve; 13. First positioning ridge; 14. Second sealing ring; 15. Positioning ring; 16. Second positioning ridge; 17. Fireproof graphite rope; 18. Buffer ring; 19. Reinforcement rib; 20. Sleeve; 21. Blocking ridge. DETAILED DESCRIPTION

[0040] The preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0041] like Figure 1-Figure 3 As shown, the utility model provides a check valve, which includes:

[0042] A valve body 1, wherein a valve cavity is provided inside the valve body 1, and an inlet and an outlet communicating with the valve cavity are respectively provided at two ends of the valve body 1;

[0043] A first valve seat 2 and a second valve seat 3, wherein the first valve seat 2 and the second valve seat 3 are respectively arranged at the inner side of the inlet and the inner side of the outlet;

[0044] A guide shaft 4, wherein the guide shaft 4 is slidably connected to the first valve seat 2 and the second valve seat 3;

[0045] A valve flap 5, wherein the valve flap 5 is connected to the guide shaft 4;

[0046] The elastic member 6 is disposed between the valve flap 5 and the second valve seat 3 . The valve flap 5 can block the inlet under the action of the elastic member 6 .

[0047] Specifically, in order to solve the problem that the guide shaft used to support the valve disc in the existing check valve has poor stability in the valve body, the suspended part of the guide shaft is easily offset under the impact of the circulating medium, resulting in wear of the guide shaft and the inability of the valve disc to operate smoothly, thereby reducing the reliability of the valve disc sealing. The utility model provides a check valve, which is an axial flow check valve. The valve body 1 of the check valve adopts an integral casting structure without external leakage. The valve body 1 structure of the check valve can adopt a non-standard short type with low cost. The first valve seat 2 and the second valve seat 3 of the check valve are respectively arranged on the inner side of the inlet and the inner side of the outlet of the valve body 1, and the guide shaft 4 is slidably connected to the first valve seat 2 and the second valve seat 3, realizing a layout structure of double supports at both ends of the guide shaft 4, avoiding the excessively long part of the guide shaft 4 in a suspended state, avoiding the wear of the guide shaft 4 under the action of the cantilever bending moment, ensuring that the valve disc 5 can operate smoothly, thereby improving the sealing reliability of the check valve.

[0048] like Figure 5 As shown, preferably, the check valve further comprises:

[0049] A flow guide cover 7, the flow guide cover 7 is connected to the second valve seat 3, and a flow guide channel is formed between the outer side of the flow guide cover 7 and the inner side of the valve cavity;

[0050] The first guide sleeve 8 is connected to the inner side of the air guide cover 7 , the guide shaft 4 passes through the first guide sleeve 8 , and the guide shaft 4 is slidably connected to the first guide sleeve 8 .

[0051] Preferably, the check valve further comprises:

[0052] A second guide sleeve 9, the second guide sleeve 9 is connected to the first valve seat 2, the guide shaft 4 passes through the second guide sleeve 9, and the guide shaft 4 is slidably connected to the second guide sleeve 9;

[0053] Positioning key: key grooves are arranged on the inner side of the second guide sleeve 9 and the guide shaft 4. When the guide shaft 4 passes through the second guide sleeve 9, the positioning key is arranged in the two key grooves, and the positioning key is slidably connected with the key grooves of the second guide sleeve.

[0054] Specifically, the length of the first guide sleeve 8 is greater than that of the second guide sleeve 9. By appropriately increasing the length of the first guide sleeve 8 and lengthening the guide distance, the coaxiality of the two end portions of the guide shaft 4 is improved, thereby improving the sealing reliability of the check valve.

[0055] The valve disc 5 will rotate under the action of the circulating medium, which is one of the failure modes of the check valve. In order to prevent the valve disc 5 from rotating, a keyway is milled on the inner side of the second guide sleeve 9 and the guide shaft 4, a positioning key is inserted to connect, and it is tightened with screws to prevent the valve disc 5 from rotating. The keyway is set on the second guide sleeve 9 with a shorter length to facilitate the processing of the keyway.

[0056] In order to reduce friction and increase wear resistance between the guide shaft 4 and the first guide sleeve 8 and the second guide sleeve 9, fine processing and polishing are adopted, and the guide shaft 4 is hardened by nickel-phosphorus plating on the entire surface.

[0057] Preferably, a flange is provided on the outer side of the first guide sleeve 8, and the first guide sleeve 8 is flange-connected to the inner side of the air guide cover body 7 via the flange, and the bolts on the flange are prevented from loosening by using double-ear stop washers.

[0058] Preferably, the check valve also includes a gland 10, and the gland 10 and the valve disc 5 are both sleeved on the guide shaft 4. The gland 10 is inserted into a slot between the valve disc 5 and the guide shaft 4. At least one annular first sealing groove is provided on the guide shaft 4 at a position for contacting the valve disc 5, and a first sealing ring 11 is sleeved in the first sealing groove.

[0059] Specifically, two annular first sealing grooves are provided on the guide shaft 4 at a position for contacting the valve disc 5. The two first sealing rings 11 are respectively sleeved in the two first sealing grooves 11. The guide shaft 4 and the valve disc are directly sealed using the two first sealing rings 11 and are pressed tightly with a pressure cover 10, so that the valve disc 5 and the guide shaft 4 are tightly sealed to achieve fireproof performance. The guide shaft 4 and the valve disc 5 adopt a split and detachable structure, which is conducive to the processing and manufacturing of parts.

[0060] Preferably, threaded holes are provided at both ends of the guide shaft 4, and the threaded holes are used to threadably connect lifting screws to facilitate lifting and assembly after assembly.

[0061] like Figure 4 As shown, preferably, the check valve further comprises:

[0062] The valve sleeve 12 is provided with an annular first positioning ridge 13 on the outside of the valve sleeve 12, and an annular blocking ridge 21 is provided on the inner side of the inlet near the outlet. The first positioning ridge 13 is used to fit on the side of the blocking ridge 21 away from the outlet. The first valve seat 2 fits with the valve sleeve 12, and at least one annular second sealing groove is provided at the position where the first positioning ridge 13 is used to contact the inner side of the inlet, and a second sealing ring 14 is sleeved in the second sealing groove;

[0063] The positioning ring 15 is a segmented positioning ring, and an annular second positioning ridge 16 is provided on the outer side of the positioning ring 15, and an annular positioning groove is provided on the inner side of the inlet away from the outlet, and the second positioning ridge 16 is arranged in the positioning groove, and the positioning ring 15 fits with the first valve seat 2, and the positioning ring 15 and the first valve seat 2 can be connected by fasteners.

[0064] Specifically, the first positioning ridge 13 is used to contact the inner side of the inlet with two annular second sealing grooves, and the two second sealing rings 14 are respectively sleeved in the two second sealing grooves to achieve double sealing. The first sealing ring 11 and the second sealing ring 14 are both O-rings, made of explosion-proof fluororubber material FKM SLT AED, applicable to ambient temperatures of -60℃ to 200℃ (-76℉ to +392℉), and the explosion-proof certificate meets the requirements of NORSOK M-710 standards.

[0065] A segmented locating ring 15 is used to fix the first valve seat 2 and the valve sleeve 12 to prevent the first valve seat 2 and the valve sleeve 12 from being blown out under the action of the circulating medium force. The locating ring 15 includes a plurality of locating blocks. After the plurality of locating blocks are installed in sequence, the last segment of locating blocks is placed at the bottom of the inlet and is locked on the first valve seat 2 by two locating screws to prevent the locating blocks from falling out. Compared with the locating ring with a threaded connection structure, such a design is simpler to process and more convenient to assemble.

[0066] Preferably, the check valve further comprises:

[0067] The fireproof graphite rope 17 is wound around the outside of the valve sleeve 12 and arranged between the first positioning ridge 13 and the first valve seat 2;

[0068] The buffer ring 18 is connected to a side of the valve sleeve 12 close to the outlet, and the buffer ring 18 is used to fit with the valve disc 5 .

[0069] Specifically, the buffer ring 18 is a non-metallic elastic material and is embedded in the side of the valve sleeve 12 close to the outlet to buffer and reduce the impact force when the valve disc 5 closes the inlet. The fire-proof graphite rope 17 and the second sealing ring 14 form a double sealing structure, which can effectively prevent the fluid medium from entering the valve cavity. At the same time, the fire-proof graphite rope 17 is arranged on the outer side of the valve cavity to protect the second sealing ring 14 from being damaged by the particulate medium. Even if the second sealing ring 14 is damaged or fails due to fire or other reasons, the fire-proof graphite rope 17 can always maintain a sealed state, which is safer and more reliable.

[0070] like Figure 8 As shown, preferably, the thickness of the valve flap 5 is 0.8 times the wall thickness of the valve body 1 , the side of the valve flap 5 away from the outlet is spherical and provided with a hard alloy layer, and the side of the valve flap 5 close to the outlet is provided with a plurality of reinforcing ribs 19 .

[0071] Specifically, the thickness of the valve flap 5 is designed to be 0.8 times the thickness of the side wall of the valve body 1. The carbide layer and the plurality of reinforcing ribs 19 can improve the strength of the valve flap 5. At the same time, the carbide layer has good wear resistance. Such a lightweight design of the valve flap reduces weight, is beneficial to reducing friction, is beneficial to the design of the elastic part 6 for resetting, and is beneficial to the realization of low-pressure opening.

[0072] Preferably, the inner diameter of the valve cavity gradually decreases from both ends of the valve body 1 toward the middle of the valve body 1, and the outer diameter of the guide cover 7 gradually decreases from one end of the guide cover 7 toward the other end of the guide cover 7, and one end of the guide cover 7 is arranged in the middle position of the valve cavity.

[0073] Specifically, a Venturi streamlined flow guide channel can be formed between the valve cavity and the flow guide cover 7, which has low flow resistance, a small vortex generation area, and a small pressure drop, and can ensure that the obstruction to the flowing medium is relatively small.

[0074] Preferably, the check valve further comprises two sleeves 20, one end of each sleeve 20 is connected to one end of the valve body 1 respectively, and both ends of each sleeve 20 are used for welding to two external pipes.

[0075] Specifically, one end of each sleeve 20 and one end of the valve body 1 form a transition section for welding, thereby ensuring the weldability and welding reliability of each weld.

[0076] Preferably, the elastic member 6 is a spring, and the elastic member 6 is sleeved on the guide shaft 4 .

[0077] Specifically, by reducing the weight of the valve flap 5 and reasonably designing the initial pressing force of the spring, the minimum pressure for opening the valve flap 5 is achieved to be no more than 2 KPa.

[0078] like Figure 8 As shown, preferably, the first valve seat 2 includes a ring sleeve and a plurality of first seat rods, one ends of the plurality of first seat rods are connected to the inner side of the valve sleeve 12 at intervals, the other ends of the plurality of first seat rods are formed with mounting holes, and the second guide sleeve 9 is connected in the mounting holes.

[0079] like Figure 7 As shown, preferably, the second valve seat 3 includes a plurality of second seat rods, one ends of which are connected to the inner side of the valve cavity at intervals, and the outer side of the flow guide cover 7 is connected to the other ends of the plurality of second seat rods.

[0080] In summary, when the check valve of the utility model is implemented, the guide shaft 4 is slidably connected to the first valve seat 2 and the second valve seat 3, realizing a layout structure with double supports at both ends of the guide shaft 4, avoiding the excessively long portion of the guide shaft 4 being in a suspended state, avoiding the wear of the guide shaft 4 under the action of the cantilever bending moment, and ensuring that the valve disc 5 can operate smoothly, thereby improving the sealing reliability of the check valve. At the same time, the check valve has a simple design structure, convenient processing and production, stable performance, fireproof performance, and can meet the requirements of API 6FA. The valve cavity can be designed to be large-caliber, which can meet high-pound requirements.

[0081] The various embodiments of the utility model have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A check valve, characterized in that: The check valve includes: A valve body, wherein a valve cavity is provided inside the valve body, and an inlet and an outlet communicating with the valve cavity are respectively provided at two ends of the valve body; a first valve seat and a second valve seat, wherein the first valve seat and the second valve seat are respectively arranged at an inner side of the inlet and an inner side of the outlet; A guide shaft, wherein the guide shaft is slidably connected to the first valve seat and the second valve seat; a valve flap, the valve flap being connected to the guide shaft; An elastic member is disposed between the valve flap and the second valve seat, and the valve flap can block the inlet under the action of the elastic member.

2. A check valve according to claim 1, characterized in that: The check valve further comprises: A flow guide cover body, wherein the flow guide cover body is connected to the second valve seat, and a flow guide channel is formed between the outer side of the flow guide cover body and the inner side of the valve cavity; A first guide sleeve, wherein the first guide sleeve is connected to the inner side of the air guide cover body, the guide shaft passes through the first guide sleeve, and the guide shaft is slidably connected to the first guide sleeve.

3. A check valve according to claim 1, characterized in that: The check valve further comprises: a second guide sleeve, wherein the second guide sleeve is connected to the first valve seat, the guide shaft passes through the second guide sleeve, and the guide shaft is slidably connected to the second guide sleeve; Positioning key: key slots are provided on the inner side of the second guide sleeve and the guide shaft. When the guide shaft passes through the second guide sleeve, the positioning key is arranged in the two key slots, and the positioning key is slidably connected with the key slots of the second guide sleeve.

4. A check valve according to claim 1, characterized in that: The check valve also includes a pressure cover, and the pressure cover and the valve disc are both sleeved on the guide shaft. The pressure cover is inserted into a slot between the valve disc and the guide shaft. At least one annular first sealing groove is provided on the guide shaft at a position for contacting the valve disc, and a first sealing ring is sleeved in the first sealing groove.

5. A check valve according to claim 1, characterized in that: The check valve further comprises: A valve sleeve, wherein an annular first positioning ridge is disposed on the outer side of the valve sleeve, an annular retaining ridge is disposed on the inner side of the inlet near the outlet, the first positioning ridge is used to fit on the side of the retaining ridge away from the outlet, the first valve seat fits on the valve sleeve, at least one annular second sealing groove is disposed at the position where the first positioning ridge is used to contact the inner side of the inlet, and a second sealing ring is sleeved in the second sealing groove; A positioning ring, which is a segmented positioning ring, wherein an annular second positioning ridge is provided on the outer side of the positioning ring, an annular positioning groove is provided on the inner side of the inlet away from the outlet, the second positioning ridge is arranged in the positioning groove, and the positioning ring is in contact with the first valve seat, and the positioning ring and the first valve seat can be connected by fasteners.

6. A check valve according to claim 5, characterized in that: The check valve further comprises: A fireproof graphite rope, which is wound around the outside of the valve sleeve and arranged between the first positioning ridge and the first valve seat; A buffer ring is connected to a side of the valve sleeve close to the outlet, and the buffer ring is used to fit with the valve disc.

7. A check valve according to claim 1, characterized in that: The thickness of the valve flap is 0.8 times the thickness of the side wall of the valve body. The side of the valve flap away from the outlet is spherical and is provided with a hard alloy layer. The side of the valve flap close to the outlet is provided with a plurality of reinforcing ribs.

8. A check valve according to claim 2, characterized in that: The inner diameter of the valve cavity gradually decreases along the two ends of the valve body toward the middle of the valve body, and the outer diameter of the guide cover gradually decreases along one end of the guide cover toward the other end of the guide cover, and one end of the guide cover is arranged in the middle position of the valve cavity.

9. A check valve according to claim 1, characterized in that: The check valve also includes two sleeves, one end of each sleeve is connected to one end of the valve body, and the two ends of each sleeve are used for welding to two external pipes.

10. A check valve according to claim 1, characterized in that: The elastic member is a spring, and the elastic member is sleeved on the guide shaft.

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