Dustproof lubricating structure of dome valve shaft

Abstract

The application provides a dustproof lubricating structure of a dome valve shaft, which comprises a graphite copper sleeve and a dustproof assembly. The graphite copper sleeve is sleeved on the dome valve shaft and can rotate relative to the graphite copper sleeve. The graphite copper sleeve has an annular groove, air holes and an air groove. The annular groove and the air groove are recessed inwardly on the inner wall of the graphite copper sleeve along the radial direction of the dome valve shaft. The air holes pass through the inner and outer walls of the graphite copper sleeve and communicate with the annular groove. The air groove communicates with the annular groove along the axial direction of the dome valve shaft and extends to one end of the graphite copper sleeve along the axial direction of the dome valve shaft. The dustproof assembly is annular, is sleeved on the dome valve shaft and abuts against the air groove of the graphite copper sleeve along the axial direction of the dome valve shaft. The application can not only lubricate the dome valve shaft but also prevent dust, so that the flexible operation of the dome valve is ensured, the safety and reliability of the equipment are ensured, the failure rate of the dome valve is greatly reduced and the working environment is improved.

Description

Technical Field

[0001] This invention relates to the field of dome valve technology, and in particular to a dustproof and lubricating structure for a dome valve shaft. Background Technology

[0002] In modern society, numerous pipelines exist for both daily life and production, used to transport various gases and liquids. To control the opening and closing of these pipelines, various valves are installed to regulate the supply or stoppage of materials. Dome valves, as a new type of valve, can effectively and rapidly open and close for release and interception, and are currently widely used in industries such as metallurgy, cement, power, chemicals, building materials, and food. In some steel plants, the sintering flue gas uses the SDA semi-dry desulfurization process. In this semi-dry flue gas purification device, desulfurization mainly involves spraying Ca(OH)2 solution into the desulfurization tower via an atomizer. The slurry comes into full contact with the flue gas in the desulfurization tower, quickly absorbing acidic gases such as SO2. The reaction is completed while the gas is being dried rapidly, producing approximately 250 tons of desulfurization ash per day. The desulfurization ash is collected into the desulfurization ash silo through a bag filter dust collector system and pneumatic conveying. The ash hopper uses a long-bag low-pressure pulse dust collector with compartmented constant pressure differential offline cleaning and is equipped with a pneumatic ash conveying silo pump. The pneumatic ash conveying silo pump mainly uses a dome valve. If the dome valve leaks or gets stuck, ash cannot be conveyed.

[0003] Currently, a copper sleeve is usually fitted onto the dome valve shaft. Figure 1 This is a schematic diagram of an existing copper bushing. Figure 2 for Figure 1 The D-direction view, specifically, see Figure 1 and Figure 2 The copper sleeve 100 is provided with an oil filling hole 101, which is connected to an annular oil groove 102 provided on the inner wall of the copper sleeve. The width L of the annular oil groove 102 along the axial direction is 4mm to 6mm. A dustproof ring is provided on the inner side of the copper sleeve near the dome valve shaft. During operation, lubricating oil enters the space between the copper sleeve and the dome valve shaft through the oil filling hole 101 for lubrication. However, because the desulfurization ash is very fine and contains some sintered ore powder, and the amount of desulfurization ash is also large, the dome valve operates frequently, which easily leads to the dustproof ring being worn quickly. The dustproof ring then loses its sealing function, and dust can enter the gap between the copper sleeve and the dome valve shaft (the gap is 0.03mm-0.06mm). The dust and grease stick together, and the longer it is left, the more it accumulates, eventually causing the dome valve to jam. If the dome valve is stuck and not properly switched, it will affect the ash discharge efficiency and cause damage to the flexible connection between the dome valve and the ash hopper, as well as the dome valve sealing ring. In severe cases, it can cause the dome valve to jam, preventing ash discharge, resulting in a high material level in the ash hopper and posing a significant safety hazard. Replacing a dome valve sealing ring requires removing and disassembling the dome valve, which requires three people and two days of work. Furthermore, the process of repairing and disassembling the dome valve generates dust, severely impacting the working environment. Summary of the Invention

[0004] The purpose of this invention is to provide a dustproof and lubricating structure for a dome valve shaft, which can both lubricate the dome valve shaft and prevent dust, thereby ensuring the flexible operation of the dome valve, the safety and reliability of the equipment, greatly reducing the failure rate of the dome valve, and also improving the working environment.

[0005] To achieve the above objectives, the present invention provides a dustproof lubrication structure for a dome valve shaft, comprising: a graphite copper sleeve and a dustproof component, wherein the graphite copper sleeve is sleeved on the dome valve shaft, and the dome valve shaft is rotatable relative to the graphite copper sleeve.

[0006] The graphite copper sleeve has an annular groove, an air hole, and an air groove; the annular groove and the air groove are both recessed radially inward into the inner wall of the graphite copper sleeve along the dome valve shaft; the air hole penetrates the inner and outer walls of the graphite copper sleeve and communicates with the annular groove; the air groove communicates with the annular groove along the axial direction of the dome valve shaft, and the air groove extends axially along the dome valve shaft to one end of the graphite copper sleeve.

[0007] The dustproof component is annular and sleeved on the dome valve shaft, and abuts against the air groove of the graphite copper sleeve along the axial direction of the dome valve shaft.

[0008] Optionally, the dustproof assembly includes a spacer ring and a dustproof ring, wherein the dustproof ring, the spacer ring, and the graphite copper sleeve abut against each other sequentially along the axial direction of the dome valve shaft.

[0009] Optionally, the dustproof ring includes a dustproof sealing ring and an outer ring. The dustproof sealing ring is sleeved on the dome valve shaft. The inner wall of the outer ring is fixedly connected to the dustproof sealing ring. The spacer abuts against the outer ring. There is a gap between the inner wall of the spacer and the dome valve shaft. One end of the dustproof sealing ring extends into the gap between the spacer and the dome valve shaft.

[0010] Optionally, the dustproof sealing ring is a rubber ring.

[0011] Optionally, the spacer ring is made of metal.

[0012] Optionally, the depth of the annular groove is the same as the depth of the air groove, both being 0.8mm to 1.5mm.

[0013] Optionally, the width of the annular groove is 10mm to 14mm.

[0014] Optionally, the air duct includes a first duct segment and a second duct segment connected axially along the dome valve shaft, the first duct segment being closer to the dustproof assembly, the length of the first duct segment being less than the length of the second duct segment, and the width of the first duct segment being less than the width of the second duct segment.

[0015] Optionally, the width of the first groove segment is 0.8mm to 1.2mm, and the width of the second groove segment is 1.8mm to 2.2mm.

[0016] Optionally, the inner wall of the graphite copper sleeve is uniformly provided with a plurality of holes, and graphite is embedded in the holes.

[0017] As configured above, this invention uses a graphite copper sleeve instead of a regular copper sleeve, meaning it uses graphite lubrication instead of grease lubrication, fundamentally preventing dust and grease from adhering. Because the graphite copper sleeve has vents, annular grooves, and air slots, compressed air can be introduced into the vents. The pressure of the compressed air fills the gap between the dome valve shaft and the graphite copper sleeve, creating an air seal, thus greatly reducing dust entering the gap and providing a dustproof effect. Furthermore, dust that has already entered the graphite copper sleeve will slowly sink into the air slot at the lower end of the annular groove due to the higher ambient temperature and gravity. The introduced compressed air will also blow the dust collected in the air slot towards the inside of the dome valve along the direction of the air slot. Therefore, this invention not only lubricates but also prevents dust from causing the dome valve shaft to jam. It ensures the flexible operation of the dome valve from multiple aspects, making the equipment safe and reliable, greatly reducing the failure rate of the dome valve, and also reducing maintenance costs and the labor intensity of workers. The dust is sealed inside the dome valve, improving the working environment. Furthermore, this invention has the advantages of simple structure, low investment cost, obvious effect, easy promotion, and significant economic and social benefits. Attached Figure Description

[0018] Those skilled in the art will understand that the accompanying drawings are provided to better understand the invention and do not constitute any limitation on the scope of the invention. Wherein:

[0019] Figure 1 A schematic diagram of an existing copper bushing;

[0020] Figure 2 for Figure 1 The D-direction view;

[0021] Figure 3 This is a schematic diagram of a dustproof and lubricating structure for a dome valve shaft according to an embodiment of the present invention;

[0022] Figure 4 This is a schematic diagram of the graphite copper sleeve in the dustproof lubrication structure of a dome valve shaft according to an embodiment of the present invention;

[0023] Figure 5 for Figure 4 The C-direction view;

[0024] Figure 6 This is a schematic diagram of the dustproof ring in the dustproof lubrication structure of a dome valve shaft according to an embodiment of the present invention.

[0025] The reference numerals in the attached figures are as follows:

[0026] 100 - Copper sleeve; 101 - Oil filling hole; 102 - Annular oil groove;

[0027] 10-Graphite copper sleeve; 11-Ventilation hole; 12-Annular groove; 13-Air groove; 131-First groove section; 132-Second groove section; 14-Graphite;

[0028] 30-spacer ring;

[0029] 40 - Dustproof ring; 41 - Dustproof sealing ring; 42 - Outer ring;

[0030] 50-Dome valve shaft. Detailed Implementation

[0031] In this document, unless otherwise stated, the terms “upper,” “lower,” “left,” “right,” “inner,” “outer,” “front,” “back,” “top,” “bottom,” etc., are used to indicate orientation or positional relationship based on the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a characteristic orientation and operation, and therefore should not be construed as a limitation of the invention.

[0032] The specific embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. The advantages and features of the present invention will become clearer from the following description. It should be noted that the drawings are all in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of the present invention.

[0033] Figure 3 This is a schematic diagram of a dustproof and lubricating structure for a dome valve shaft according to an embodiment of the present invention. Figure 4 This is a schematic diagram of the graphite copper sleeve in the dustproof lubrication structure of a dome valve shaft according to an embodiment of the present invention. Figure 5 yes Figure 4 The C-direction view. Please refer to... Figure 3 , Figure 4 and Figure 5This invention provides a dustproof lubrication structure for a dome valve shaft. The dustproof lubrication structure includes a graphite copper sleeve 10 and an annular dustproof component. Both the graphite copper sleeve 10 and the dustproof component are sleeved on the dome valve shaft 50. The end of the dome valve shaft 50 near the graphite copper sleeve 10 usually refers to the outer side of the dome valve, and the end of the dome valve shaft 50 near the dustproof component usually refers to the inner side of the dome valve. Dust comes from the inner side of the dome valve, i.e., the interior of the dome valve. The purpose of this invention is to prevent dust inside the dome valve from reaching the outer side of the dome valve, thereby improving the working environment.

[0034] The dome valve shaft 50 is rotatable relative to the graphite copper sleeve 10. The graphite copper sleeve 10 has an annular groove 12, an air hole 11, and an air groove 13. Both the annular groove 12 and the air groove 13 are recessed radially inward into the inner wall of the graphite copper sleeve 10. In this embodiment, the air groove 13 can be strip-shaped. The air hole 11 penetrates the inner and outer walls of the graphite copper sleeve 10 and communicates with the annular groove 12. The air groove 13 communicates with the annular groove 12 along the axial direction of the dome valve shaft 50 and extends axially to one end of the graphite copper sleeve 50. The dustproof component is annular and abuts against the air groove 13 of the graphite copper sleeve 10 along the axial direction of the dome valve shaft 50.

[0035] Thus, with the above configuration, this invention uses a graphite copper sleeve 10 instead of a regular copper sleeve, that is, graphite lubrication instead of grease lubrication, fundamentally avoiding the adhesion of dust and grease. Because the graphite copper sleeve 10 has air holes 11, annular grooves 12, and air grooves 13, compressed air can be introduced into the air holes 11. The pressure of the compressed air fills the entire gap between the dome valve shaft 50 and the graphite copper sleeve 10, creating an air seal, thereby greatly reducing the amount of dust entering the gap and achieving a dustproof effect. Simultaneously, even when the dustproof component is worn, dust entering the gap between the dome valve shaft 50 and the graphite copper sleeve 10 through the gap between the dustproof component and the dome valve shaft 50 will slowly sink to the air groove 13 at the lower end of the annular groove 12 of the graphite copper sleeve 10 due to the high ambient temperature and gravity. The introduced compressed air will also blow the dust collected in the air groove 13 towards the inside of the dome valve. Therefore, this invention not only has a lubricating effect but also a dustproof effect, avoiding the problem of dust causing the dome valve shaft 50 to jam. It ensures the flexible operation of the dome valve from multiple aspects, making the equipment safe and reliable, greatly reducing the failure rate of the dome valve, and also reducing maintenance costs and the labor intensity of workers. The dust is sealed inside the dome valve, improving the working environment. Furthermore, this invention has the advantages of simple structure, low investment cost, obvious effect, easy promotion, and significant economic and social benefits.

[0036] Furthermore, the dustproof assembly includes a spacer ring 30 and a dustproof ring 40. The shaft end faces of the dustproof ring 40, the spacer ring 30, and the graphite copper sleeve 10 abut against each other in sequence to prevent dust from passing through the gap between the spacer ring 30 and the graphite copper sleeve 10 and the gap between the spacer ring 30 and the dustproof ring 40.

[0037] Furthermore, the dustproof ring 40 includes a dustproof sealing ring 41 and an outer ring 42. See also Figure 6 The dustproof sealing ring 41 is sleeved on the dome valve shaft 50. The inner wall of the outer ring 42 is fixedly connected to the dustproof sealing ring 41. The other shaft end face of the spacer ring 30 abuts against the shaft end face of the outer ring 42. There is a gap between the inner wall of the spacer ring 30 and the dome valve shaft 50. One end of the dustproof sealing ring 41 extends into the gap between the spacer ring 30 and the dome valve shaft 50.

[0038] Preferably, the dustproof sealing ring 41 is a rubber ring. Rubber rings offer reliable sealing performance, are standardized sealing elements, and are inexpensive. Rubber materials can effectively seal against oil, water, air, and various chemical media. Furthermore, rubber materials have a wide operating temperature range, typically from -45℃ to 260℃. The spacer ring 30 is made of metal, such as A3 steel. A3 steel is easy to process and can be manufactured into different shapes and sizes through hot rolling, cold drawing, and cold rolling processes; it has high strength and good mechanical properties, making it widely used in most industrial fields; it has good workability and can be forged and welded; it has good machinability and is widely used in machinery manufacturing and tool manufacturing, and also has a relatively low cost. The spacer ring 30 and the dustproof sealing ring 41 can be fixed together, for example, by a pressing process.

[0039] Understandably, during the operation of the dome valve, there is bound to be relative movement between the graphite copper sleeve 10 and the dustproof ring 40. The spacer ring 30 can isolate the graphite copper sleeve 10 from the dustproof ring 40, preventing the dustproof ring 40 from contacting the graphite copper sleeve 10 and rubbing against it, thus causing wear. In this embodiment, the spacer ring 30 prevents the dustproof sealing ring 41 of the dustproof ring 40 from directly contacting the graphite copper sleeve 10 and being worn. Moreover, the spacer ring 30 abuts against the outer ring 42 of the dustproof ring 40, and will not wear the dustproof sealing ring 41. Therefore, the spacer ring 30 also increases the service life of the dustproof sealing ring 41.

[0040] Preferably, the depth of the annular groove 12 is the same as the depth of the air groove 13, for example, both are 0.8 to 1.5 mm deep. It is understood that the depths of the annular groove 12 and the air groove 13 refer to their radial depths along the graphite copper sleeve 10. Thus, the annular groove 12 and the air groove 13 have the same depth and are interconnected, facilitating the discharge of dust from the interior of the dome valve.

[0041] Preferably, the groove width S of the annular groove 12 along the axial direction of the graphite copper sleeve 10 is 10mm to 14mm, which is wider than the width L of the annular oil groove 102 of the copper sleeve in the prior art. This reduces the contact area between the dome valve shaft 50 and the graphite copper sleeve 10, thereby reducing the operating resistance to a certain extent and making the dome valve shaft 50 rotate more flexibly. In this embodiment, the groove width S of the annular groove 12 can be 12mm.

[0042] Preferably, the air groove 13 includes a first groove segment 131 and a second groove segment 132 connected axially along the dome valve shaft 50. The first groove segment 131 is closer to the dustproof assembly, and the length of the first groove segment 131 is less than the length of the second groove segment 132, and the width of the first groove segment 131 is less than the width of the second groove segment 132. This allows the compressed air pressure to increase, enabling more powerful and thorough dust removal. It should be understood that the length of the first groove segment 131 and the length of the second groove segment 132 refer to the axial length of the first groove segment 131 / second groove segment 132 along the dome valve shaft 50, and the width of the first groove segment 131 and the width of the second groove segment 132 refer to the approximate circumferential dimension along the dome valve shaft 50, that is, the width perpendicular to the axial direction of the dome valve shaft 50.

[0043] For example, the width 'a' of the first groove segment 131 is 0.8mm to 1.2mm, and the width 'b' of the second groove segment 132 is 1.8mm to 2.2mm. More specifically, for example, the width of the first groove segment 131 is 1mm, and the width of the second groove segment 132 is 2mm. The sudden decrease in width at the junction of the first groove segment 131 and the second groove segment 132 increases the pressure of the compressed air, allowing the dust to be blown out more forcefully and thoroughly.

[0044] Regarding the installation method of graphite in the graphite copper sleeve 10, in a specific embodiment, the inner wall of the graphite copper sleeve 10 is uniformly provided with several holes, and graphite 14 is embedded in the holes to play the role of graphite lubrication. The graphite is dry, so it will not stick to dust and will not jam the dome valve shaft 50.

[0045] Preferably, the gap between the portion of the graphite copper sleeve 10 near the outer side of the dome valve and the dome valve shaft 50 is 0.01mm-0.03mm, and the gap between the portion of the graphite copper sleeve 10 near the inner side of the dome valve and the dome valve shaft 50 is 0.04mm-0.06mm. With this configuration, most of the compressed air will be blown towards the inner side of the dome valve, and dust will be blown into the dome valve, preventing dust leakage to the outer side of the dome valve and affecting the working environment.

[0046] It should be noted that references to "an embodiment," "an embodiment," "a specific embodiment," "some embodiments," etc., in the specification only indicate that the described embodiment may include a specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Additionally, when a specific feature, structure, or characteristic is described in conjunction with an embodiment, whether explicitly described or not, implementing such a feature, structure, or characteristic in conjunction with other embodiments is within the knowledge of those skilled in the art.

[0047] It should also be noted that although the present invention has been disclosed above with reference to preferred embodiments, these embodiments are not intended to limit the present invention. For any person skilled in the art, many possible variations and modifications can be made to the technical solutions of the present invention based on the disclosed technical content, or equivalent embodiments can be modified accordingly, without departing from the scope of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the present invention shall still fall within the scope of protection of the present invention.

[0048] It should also be understood that, unless otherwise specified or indicated, the terms “first,” “second,” “third,” etc., in the specification are used only to distinguish the various components, elements, and steps in the specification, and not to indicate the logical or sequential relationships between the various components, elements, and steps.

[0049] Furthermore, it should be recognized that the terminology described herein is used only to describe particular embodiments and not to limit the scope of the invention. It must be noted that the singular forms “a” and “an” used herein and in the appended claims include plural bases unless the context clearly indicates otherwise. For example, a reference to “a step” or “an apparatus” means a reference to one or more steps or apparatuses, and may include secondary steps and secondary apparatuses. All conjunctions used should be understood in the broadest sense. Also, the word “or” should be understood to have the definition of logical “or” rather than logical “exclusive OR”, unless the context clearly indicates otherwise. Furthermore, implementation of the methods and / or devices in embodiments of the invention may include performing selected tasks manually, automatically, or in combination.

Claims

1. A dustproof and lubricating structure for a dome valve shaft, characterized in that, It includes a graphite copper sleeve and a dustproof assembly, wherein the graphite copper sleeve is fitted onto a dome valve shaft, and the dome valve shaft is rotatable relative to the graphite copper sleeve. The graphite copper sleeve has an annular groove, an air hole, and an air groove; the annular groove and the air groove are both recessed radially inward into the inner wall of the graphite copper sleeve along the dome valve shaft; the air hole penetrates the inner and outer walls of the graphite copper sleeve and communicates with the annular groove; the air groove communicates with the annular groove along the axial direction of the dome valve shaft, and the air groove extends axially along the dome valve shaft to one end of the graphite copper sleeve. The dustproof component is ring-shaped and sleeved on the dome valve shaft, and abuts against the air groove of the graphite copper sleeve along the axial direction of the dome valve shaft. The dustproof assembly includes a spacer ring and a dustproof ring, wherein the dustproof ring, the spacer ring, and the graphite copper sleeve abut against each other in sequence along the axial direction of the dome valve shaft; The dustproof ring includes a dustproof sealing ring and an outer ring. The dustproof sealing ring is sleeved on the dome valve shaft. The inner wall of the outer ring is fixedly connected to the dustproof sealing ring. The spacer abuts against the outer ring. There is a gap between the inner wall of the spacer and the dome valve shaft. One end of the dustproof sealing ring extends into the gap between the spacer and the dome valve shaft.

2. The dustproof and lubricating structure for the dome valve shaft as described in claim 1, characterized in that, The dustproof sealing ring is a rubber ring, and the spacer ring is made of metal.

3. The dustproof and lubricating structure for the dome valve shaft as described in claim 1, characterized in that, The depth of the annular groove is the same as the depth of the air groove.

4. The dustproof and lubricating structure for the dome valve shaft as described in claim 3, characterized in that, The depth of the annular groove and the depth of the air groove are both 0.8mm to 1.5mm.

5. The dustproof and lubricating structure for the dome valve shaft as described in claim 1, characterized in that, The width of the annular groove is 10mm to 14mm.

6. The dustproof and lubricating structure for the dome valve shaft as described in claim 1, characterized in that, The air duct includes a first duct segment and a second duct segment connected axially along the dome valve shaft. The first duct segment is closer to the dustproof assembly. The length of the first duct segment is less than the length of the second duct segment, and the width of the first duct segment is less than the width of the second duct segment.

7. The dustproof and lubricating structure for the dome valve shaft as described in claim 6, characterized in that, The width of the first groove segment is 0.8mm to 1.2mm, and the width of the second groove segment is 1.8mm to 2.2mm.

8. The dustproof and lubricating structure for the dome valve shaft as described in claim 1, characterized in that, The inner wall of the graphite copper sleeve is uniformly provided with a number of holes, and graphite is embedded in the holes.

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