Self-cleaning butterfly valve

Abstract

The utility model provides a self-cleaning type butterfly valve which comprises a valve body, a valve rod and material scraping barrels, a through hole and a mounting hole are formed in the valve body, the through hole and the mounting hole are collinear, the material scraping barrels are arranged at the two ends of the valve rod respectively, the material scraping barrels are arranged on the valve rod in a sleeved mode, one material scraping barrel is in clearance fit with the mounting hole, and the other material scraping barrel is in clearance fit with the through hole. The scraping device comprises a scraping barrel, the inner wall of the scraping barrel abuts against the inner wall of the valve rod, a plurality of scraping grooves are formed in the inner wall of the scraping barrel, and the two ends of each scraping groove extend out of the end faces of the two ends of the scraping barrel respectively. And the scraped impurities are extruded and discharged along the position of the scraping groove, so that the retention of the impurities in the valve is reduced, the valve can be kept clean, and the service life of the valve is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to valve equipment field, in particular to a self -cleaning butterfly valve. BACKGROUND

[0002] As a kind of control valve widely used in chemical industry, petroleum, water treatment, electric power and metallurgy etc., with the advantage of simple structure, small size, light weight, through valve stem drive butterfly plate rotation around shaft, realize the on-off control and flow regulation of pipeline fluid. However, in the special application scene of dust impurity condition, its traditional sealing structure exposes significant defects: to meet the installation demand of non-metallic shaft seal, annular gap needs to be reserved between valve body and valve stem, this through-hole space is easy to become the channel of dust accumulation in long-term use process. When dust impurity continues to penetrate and stay in the precise fit clearance between valve stem and bearing, dust particles as the third body abrasive, aggravate the wear of bearing surface in valve stem reciprocating motion, cause fit clearance to be out of tolerance, impurity accumulation forms physical jam, make valve stem rotation torque increase sharply, finally cause the seizure failure of valve stem and bearing, not only cause valve operation failure, more likely cause process interruption due to control failure, even cause equipment damage or safety accident SUMMARY

[0003] In view of the above-mentioned shortcomings of prior art, the purpose of the utility model is to provide a self-cleaning butterfly valve, to solve the technical problem that dust impurities can enter the gap between the valve stem and the bearing in the prior art, causing the seizure of the valve stem and the bearing.

[0004] To achieve the above-mentioned purpose and other related purposes, the utility model provides a self-cleaning butterfly valve, comprising:

[0005] A valve body is provided with a through hole and a mounting hole, the through hole and the mounting hole are arranged in line, and a valve plate is further provided in the valve body.

[0006] A valve stem passes through the valve plate and is arranged in the valve body, the valve plate and the valve stem are connected by a positioning pin, one end of the valve stem is located in the mounting hole, the other end of the valve stem extends out of the valve body from the through hole, and a bottom cover is arranged at the outer opening of the mounting hole.

[0007] A scraping cylinder is arranged at both ends of the valve stem, the scraping cylinder is sleeved on the valve stem, one scraping cylinder is gap-fitted with the mounting hole, and the other scraping cylinder is gap-fitted with the through hole, and the inner wall of the scraping cylinder is tightly abutted with the inner wall of the valve stem.

[0008] A plurality of scraping grooves are arranged on the inner wall of the scraping cylinder, and the two ends of the scraping grooves respectively extend out of the two end faces of the scraping cylinder.

[0009] The above technical scheme has the advantages that the gap fit between the bearing and the valve rod maintains the guiding performance of the bearing, and the gap fit makes the scraping cylinder directly communicate with the flow channel, eliminating the via space in the traditional structure; the plurality of scraping grooves are arranged on the inner wall of the scraping cylinder, and the scraping grooves play the role of a scraper during the rotation of the valve rod, scraping the dust adhered to the surface of the valve rod, and the impurities after scraping are extruded and discharged along the position of the scraping groove, reducing the retention of the impurities in the valve, helping to maintain the cleanliness of the valve, and prolonging the service life of the valve.

[0010] Optionally, all the scraping grooves are uniformly distributed around the axis of the scraping cylinder.

[0011] Optionally, the scraping grooves are arranged in an S shape on the inner wall of the scraping cylinder.

[0012] Optionally, the cross section of the scraping groove is rectangular.

[0013] Optionally, the scraping cylinder is a bearing, and all the scraping grooves are located on the inner wall of the bearing.

[0014] Optionally, a packing bottom pad is arranged between the through hole and the valve rod, and the packing bottom pad is located on the outer side of the scraping cylinder.

[0015] Optionally, a blowing port is arranged on the bottom cover and the valve body respectively, each blowing port corresponds to one scraping cylinder, one end of the blowing port is connected to the outside, and the other end of the blowing port is close to the corresponding scraping cylinder.

[0016] Optionally, the mounting hole comprises a guide portion and a mounting portion, the diameter of the mounting portion is greater than the diameter of the guide portion, an annular sealing groove is further arranged at the end of the valve rod, a limiting ring is arranged in the annular sealing groove, the outer ring of the limiting ring protrudes out of the annular sealing groove, the outer ring edge of the limiting ring is greater than the diameter of the guide portion, and the bottom cover is arranged on the mounting portion.

[0017] Optionally, a sealing ring is arranged in the mounting portion, the sealing ring is sleeved on the valve rod, and the sealing ring is located on the outer side of the limiting ring.

[0018] Optionally, the bottom cover is threadedly connected with the mounting portion.

[0019] The utility model discloses a self-cleaning butterfly valve, which has the following beneficial effects: gap fit is adopted between the bearing and the valve rod, the bearing guiding performance is kept, the scraping cylinder is directly communicated with the flow channel, the via hole space in the traditional structure is eliminated, a plurality of scraping grooves are arranged on the inner wall of the scraping cylinder, the scraping grooves play the role of scraper during the rotation of the valve rod, the dust adhered to the surface of the valve rod is scraped, the impurities after scraping are extruded and discharged along the position of the scraping groove, the retention of the impurities in the valve is reduced, the valve is kept clean, and the service life is prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0020] Fig. 1 A cross-sectional structure schematic view in the embodiment of the utility model is shown;

[0021] Fig. 2 A cross-sectional structure schematic view in the embodiment of the utility model is shown;

[0022] Fig. 3 A scraping cylinder structure schematic view in the embodiment of the utility model is shown.

[0023] PART NUMBER EXPLANATION

[0024] 1 valve body

[0025] 2 valve rod

[0026] 3 scraping cylinder

[0027] 301 scraping groove

[0028] 4 packing bottom pad

[0029] 5 bottom cover

[0030] 6 limiting ring

[0031] 7 sealing ring DETAILED DESCRIPTION

[0032] The embodiments of the utility model are explained below through specific examples, and other advantages and effects of the utility model can be easily understood by those skilled in the art according to the disclosure. The utility model can also be implemented or applied through different specific embodiments, and each detail in the specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the utility model.

[0033] Please refer to Figs. 1 to 3It is to be noted that the drawings provided in the present embodiment only schematically illustrate the basic concept of the present application, and only show the components related to the present application in the drawings, rather than being drawn according to the number, shape and size of the components in actual implementation. The shape, number and proportion of each component in implementation can be arbitrarily changed, and the component layout pattern can be more complex. The structure, proportion, size and the like shown in the drawings of the present specification are only used to cooperate with the content disclosed in the specification, so as to be understood and read by those skilled in the art, and do not define the limiting conditions for the implementation of the present application, so they do not have substantial technical significance. Any modification of structure, change of proportion relationship or adjustment of size, without affecting the effects and purposes that can be achieved by the present application, should still fall within the scope of the technical content disclosed by the present application. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" in the present specification are only for the convenience of clear description, and are not used to limit the scope of the present application. The change or adjustment of the relative relationship, without substantially changing the technical content, is also considered as the scope of the present application.

[0034] Please refer to Figs. 1 to 3 The utility model provides a self -cleaning butterfly valve, including:

[0035] Valve body 1, be equipped with through -hole and mounting hole in the valve body 1, the through -hole with the mounting hole collinear arrangement, still be equipped with valve plate in the valve body 1,

[0036] Valve stem 2, the valve stem 2 passes through the valve plate and sets up in the valve body 1, the valve plate with the valve stem 2 between through the locating pin connection, the valve stem 2 one end is located in the mounting hole, the valve stem 2 other end from the through -hole stretches out the valve body 1, is equipped with bottom cover 5 at the outside hole orifice of mounting hole,

[0037] Scraping cylinder 3, the scraping cylinder 3 sets up in the both ends of valve stem 2 respectively, the scraping cylinder 3 is set on the valve stem 2, one scraping cylinder 3 with the mounting hole clearance fit, another scraping cylinder 3 with the through -hole clearance fit, the inner wall of scraping cylinder 3 with the inner wall of valve stem 2 abuts tightly,

[0038] Be equipped with a plurality of scraping grooves 301 in the inner wall of scraping cylinder 3, and the both ends of scraping groove 301 respectively from the both ends end face of scraping cylinder 3 stretch out.

[0039] It is also necessary to point out that the scraping groove plays the role of a cutting edge during the rotation of the valve stem, scraping the dust and impurities accumulated on the surface of the valve stem. This design effectively prevents impurities from entering the gap between the valve stem and the bearing, thereby reducing the risk of the valve stem and bearing seizing, and making it easier for the scraped impurities to be discharged along the groove. This design reduces the retention of impurities inside the valve.

[0040] Further, the design of the scraping groove does not interfere with the guiding function of the bearing. Because the valve stem is generally in line contact with the bearing during operation, and the helical or S-shaped scraping groove does not negatively affect the guiding performance. This design ensures the stability and reliability of the valve stem.

[0041] For example, all the scraping grooves 301 are uniformly distributed around the axis of the scraping cylinder 3.

[0042] It is also necessary to point out that the scraping groove is set to 4 grooves and is staggered and evenly distributed at 90°, ensuring that it can be completely scraped in place in 360-degree directions. This design ensures the overall cleanliness of the valve stem surface, further reducing the possibility of impurity accumulation.

[0043] For example, the scraping groove 301 is S-shaped on the inner wall of the scraping cylinder 3.

[0044] It is also necessary to point out that the S-shaped scraping groove plays the role of a cutting edge during the rotation of the valve stem, scraping the dust and impurities accumulated on the surface of the valve stem. This design effectively prevents impurities from entering the gap between the valve stem and the bearing, and compared to straight or other shaped scraping grooves, the S-shaped scraping groove can more comprehensively scrape the impurities on the surface of the valve stem. Its curved shape increases the contact area and scraping path with the valve stem, thereby improving cleaning efficiency.

[0045] For example, the cross section of the scraping groove 301 is rectangular.

[0046] It is also necessary to point out that the main function of the rectangular cross section scraping groove 301 is to scrape the dust and impurities accumulated or adhered on the surface of the valve stem during the rotation of the valve stem. The rectangular cross section scraping groove has a clear cutting edge function, which can effectively scrape the impurities on the surface of the valve stem during the rotation of the valve stem.

[0047] Further, the cross section of the scraping groove 301 is semicircular, which can prevent dust and impurities from accumulating at the angle of the scraping groove 301.

[0048] For example, the scraping cylinder 3 is a bearing, and all the scraping grooves 301 are located on the inner wall of the bearing.

[0049] It should be noted that the bearing sleeve is arranged on the valve stem and is in clearance fit with the mounting hole or through hole of the valve body 1. The bearing provides a guiding effect for the valve stem, ensuring that the valve stem maintains a stable motion trajectory during rotation. Since the valve stem is positioned and guided by the upper and lower bearings, the valve stem and the bearing are generally in linear contact during operation. Therefore, the spiral-shaped scraping groove does not significantly affect the guiding effect of the bearing.

[0050] Exemplarily, a packing bottom pad 4 is arranged between the through hole and the valve stem 2, and the packing bottom pad 4 is located on the outer side corresponding to the scraping cylinder 3.

[0051] It should be noted that the presence of the packing bottom pad can effectively prevent leakage of the medium through the gap between the valve stem and the valve body, thereby improving the sealing performance of the butterfly valve. Since the packing bottom pad is located on the outer side of the scraping cylinder, it can reduce the direct scouring and corrosion of the medium on the scraping cylinder. This design helps to prolong the service life of the scraping cylinder, reduce the maintenance and replacement costs caused by damage to the scraping cylinder, and the supporting effect of the packing bottom pad can enhance the connection stability between the valve stem and the valve body. This makes the butterfly valve more stable and reliable during opening and closing, reducing the risk of failure caused by vibration or impact.

[0052] Exemplarily, a purge port is arranged on each of the bottom cover 5 and the valve body, and each purge port corresponds to one of the scraping cylinders. One end of the purge port is connected to the outside, and the other end of the purge port is close to the corresponding scraping cylinder 3.

[0053] It should be noted that a purge port is arranged on the valve body, and the purge port is connected to the inner cavity of the valve body. This means that gas or liquid can be introduced into the valve body through the purge port to remove impurities inside the valve body, especially dust-like impurities attached to the valve stem 2 and the scraping cylinder 3. This design helps to keep the inside of the valve body clean. The bottom cover is provided with a purge port for purging between the other scraping cylinder 3 and the valve stem 2. A sealing plug is arranged on the purge port, which helps to maintain the sealing and cleanliness of the inside of the valve body.

[0054] Exemplarily, the mounting hole includes a guide portion and a mounting portion, and the diameter of the mounting portion is greater than the diameter of the guide portion. An annular sealing groove is further arranged on the end of the valve stem 2, and a limiting ring 6 is arranged in the annular sealing groove. The outer ring of the limiting ring 6 protrudes out of the annular sealing groove, and the outer ring edge of the limiting ring 6 is greater than the diameter of the guide portion. The bottom cover 5 is arranged on the mounting portion.

[0055] It is also necessary to explain that the mounting hole is arranged in the valve body, which is collinear with the through hole, used to accommodate and support one end of the valve stem and the scraping cylinder 3, the mounting hole includes a guide part and a mounting part, the guide part is used to guide the insertion of the valve stem, ensuring that the valve stem can be installed correctly; the mounting part is used to fix the bottom cover and other sealing components, providing stable support, the annular sealing groove is arranged at the end of the valve stem, used to accommodate the limiting ring, forming an additional sealing layer, the cooperation of the annular sealing groove and the limiting ring increases the sealing between the valve stem and the valve body, effectively preventing medium leakage, the limiting ring limits the axial movement of the valve stem in the mounting hole, and cooperates with the sealing ring to enhance the sealing effect, the bottom cover is arranged at the outer opening of the mounting hole, used to close the mounting hole and prevent medium leakage, the bottom cover is usually fixed on the valve body by screw connection or other fastening methods, facilitating installation and disassembly.

[0056] Exemplarily, a sealing ring 7 is arranged in the mounting part, the sealing ring 7 is sleeved on the valve stem 2, and the sealing ring 7 is located outside the limiting ring 6.

[0057] It is also necessary to explain that the sealing ring 7 is located outside the limiting ring 6, which mainly functions to enhance the sealing performance between the valve stem 2 and the valve body 1, preventing medium leakage. This design ensures that the medium will not leak through the small gap between the valve stem and the valve body during the closing or opening process of the valve, thereby improving the overall sealing performance of the valve, the sealing ring 7 is used in cooperation with the limiting ring 6, the limiting ring 6 is clamped in the annular sealing groove of the valve stem 2, and the outer edge of the limiting ring 6 is greater than the diameter of the guide part, thereby limiting the axial movement of the valve stem 2 in the mounting hole. The sealing ring 7 is located outside the limiting ring 6, further providing additional fixation and support, ensuring the stability and axial positioning of the valve stem 2, the design of the sealing ring outside the limiting ring can effectively prevent the medium from leaking through the small gap between the valve stem and the valve body. This design improves the sealing performance of the valve by increasing the sealing level and sealing area.

[0058] Exemplarily, the bottom cover 5 is threadedly connected between the mounting part.

[0059] It should be noted that the threaded connection between the bottom cover 5 and the mounting portion is mainly used to firmly fix the bottom cover 5 on the mounting portion. This fixing mode ensures that the bottom cover 5 cannot be easily loosened or detached, thereby maintaining the stability and integrity of the internal structure of the butterfly valve. At the same time, the threaded connection also has a certain sealing effect. Through precise thread matching and appropriate tightening torque, an effective sealing barrier can be formed to prevent the leakage of medium or external impurities into the interior of the butterfly valve through the connection, affecting the normal operation of the valve. The design of the threaded connection makes it more convenient and fast to install and disassemble the bottom cover 5. When it is necessary to maintain, inspect or replace parts of the butterfly valve, the worker can easily unscrew the bottom cover 5, perform the necessary operation and then screw it back in place. This design reduces the difficulty and time cost of maintenance.

[0060] In summary, the self-cleaning butterfly valve of the present application uses a gap fit between the bearing and the valve stem to maintain the guiding performance of the bearing while allowing the scraper cylinder to be directly connected to the flow channel, eliminating the via space in the traditional structure. A plurality of scraping grooves are provided on the inner wall of the scraper cylinder. These scraping grooves act as scrapers during the rotation of the valve stem, scraping the dust adhering to the surface of the valve stem. The impurities after scraping are extruded and discharged along the position of the scraping groove, reducing the retention of impurities in the valve, helping to maintain the cleanliness of the valve and prolonging its service life.

[0061] The above embodiments only exemplarily illustrate the principles and effects of the present application, and are not intended to limit the present application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical concept disclosed by the present application shall be covered by the claims of the present application.

Claims

1. A self-cleaning butterfly valve, characterized by, The utility model relates to a valve body, the valve body is provided with through hole and mounting hole in the valve body, the through hole is provided with the mounting hole collinearly, and the valve body is further provided with valve plate in the valve body. Valve rod, the valve rod passes through the valve plate and is provided in the valve body, the valve plate is connected with the valve rod through the positioning pin, one end of the valve rod is located in the mounting hole, the other end of the valve rod is stretched out from the through hole in the valve body, and the bottom cover is arranged at the outside orifice of the mounting hole. Scraping cylinder, the scraping cylinder is respectively arranged at both ends of the valve rod, the scraping cylinder is sleeved on the valve rod, one scraping cylinder is matched with the mounting hole, another scraping cylinder is matched with the through hole, and the inner wall of the scraping cylinder is tightly closed with the inner wall of the valve rod. A plurality of scraping grooves are arranged on the inner wall of the scraping cylinder, and the two ends of the scraping groove are respectively stretched out from the two end faces of the scraping cylinder. All the scraping grooves are uniformly distributed around the axis of the scraping cylinder.

2. A self-cleaning butterfly valve according to claim 1, characterized in that: The scraping groove is S-shapedly arranged on the inner wall of the scraping cylinder.

3. A self-cleaning butterfly valve according to claim 1, wherein: The cross section of the scraping groove is rectangular.

4. The self-cleaning butterfly valve of claim 1, wherein: The scraping cylinder is a bearing, and all the scraping grooves are located on the inner wall of the bearing.

5. A self-cleaning butterfly valve according to claim 1, wherein: A packing bottom pad is arranged between the through hole and the valve rod, and the packing bottom pad is located outside the corresponding scraping cylinder.

6. A self-cleaning butterfly valve according to claim 1, wherein: A purge port is arranged on the bottom cover and the valve body respectively, each purge port corresponds to a scraping cylinder, one end of the purge port is connected with the outside, and the other end of the purge port is close to the corresponding scraping cylinder.

7. A self-cleaning butterfly valve according to claim 1, wherein: The mounting hole comprises a guide portion and a mounting portion, the diameter of the mounting portion is greater than that of the guide portion, an annular sealing groove is further arranged at the end of the valve rod, a limiting ring is clamped in the annular sealing groove, the outer ring of the limiting ring is stretched out of the annular sealing groove, the outer ring edge of the limiting ring is greater than the diameter of the guide portion, and the bottom cover is arranged on the mounting portion.

8. A self-cleaning butterfly valve according to claim 1, wherein: A sealing ring is arranged in the mounting portion, the sealing ring is sleeved on the valve rod, and the sealing ring is located outside the limiting ring.

9. A self-cleaning butterfly valve according to claim 8, wherein: The bottom cover is threadedly connected with the mounting portion.

10. A self-cleaning butterfly valve according to claim 9, wherein: ​

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