Ultrahigh pressure stainless steel pipe sealing connection structure
By designing a split stainless steel pipe sealing connection structure, the problems of sealing and ease of disassembly/reassembly of hose connections in high-pressure water cleaning equipment were solved, achieving reliable sealing and low-cost connection under ultra-high pressure environment, and improving operational safety and work efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HENAN FENGDA INTELLIGENT EQUIP CO LTD
- Filing Date
- 2025-06-12
- Publication Date
- 2026-05-26
AI Technical Summary
In existing high-pressure water cleaning equipment, hose connections suffer from problems such as increased labor intensity due to frequent retraction and extension, rapid wear, high cost, poor safety, and high fluid resistance. Furthermore, existing rigid pipe connections lack sealing performance and ease of disassembly and assembly under ultra-high pressure environments.
Design a split-type stainless steel pipe sealing connection structure, which adopts a combination of external thread connection, flange ring clamping and O-ring sealing ring to ensure sealing performance and pressure resistance, and reduces the difficulty and cost of disassembly and assembly through the split design.
It achieves reliable sealing under ultra-high pressure environment, reduces construction costs and labor intensity, improves operation safety and work efficiency, and extends equipment service life.
Smart Images
Figure CN224283825U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of high-pressure water cleaning equipment, and relates to an ultra-high pressure stainless steel pipe sealing connection structure. Background Technology
[0002] In high-pressure cleaning applications, such as industrial equipment cleaning, pipe dredging, and surface treatment, pump units are typically located far from the cleaning site, requiring the use of pipelines to transport high-pressure water to the work area. Currently, the industry commonly uses ultra-high-pressure hoses to transport high-pressure water, which offers some flexibility but has the following significant drawbacks.
[0003] 1. High-pressure hoses require frequent retraction and extension, increasing the workload of operators;
[0004] 2. The hose is prone to wear and tear during use, resulting in a short service life;
[0005] 3. Ultra-high pressure hoses are expensive and require long-distance transport, increasing construction costs;
[0006] 4. The hose has limited pressure resistance and is at risk of bursting under high pressure, affecting operational safety;
[0007] 5. The relatively small inner diameter of the hose results in high fluid resistance, which affects work efficiency.
[0008] To address the aforementioned issues, installing high-pressure rigid pipes on-site to replace flexible hoses has become a promising solution. High-pressure rigid pipes offer advantages such as superior pressure resistance, long service life, low cost, and the ability to achieve larger inner diameters. However, connecting stainless steel high-pressure rigid pipes presents several technical challenges. These challenges include meeting sealing requirements under ultra-high pressure environments (typically 20MPa-200MPa), ensuring ease of disassembly and assembly due to frequent pipe repositioning for high-pressure water cleaning operations, and acknowledging the need for numerous connection points over long distances while maintaining reasonable costs for sealing connections.
[0009] Existing pipe connection methods, such as welding and threaded connections, often fail to meet sealing requirements under ultra-high pressure environments, or are structurally complex, costly, and inconvenient to disassemble and assemble, making them unsuitable for frequent adjustments during high-pressure water cleaning. Utility Model Content
[0010] In order to overcome the shortcomings of the prior art, this utility model provides an ultra-high pressure stainless steel pipe sealing connection structure. The purpose is to overcome the technical problems of poor sealing reliability, inconvenient disassembly and assembly, low load-bearing capacity of connection points, and high cost of existing rigid pipe connections. The present invention designs a split connection component that has the advantages of sealing performance, pressure resistance, convenient disassembly and assembly, and low cost, making it suitable for application in the field of high-pressure water cleaning.
[0011] To achieve the above objectives, this utility model provides the following technical solution: a high-pressure stainless steel pipe sealing connection structure, comprising stainless steel pipes with external threads at both ends; two stainless steel pipes are respectively threaded to a concave plate connector and a flat plate connector; the end face of the concave plate connector fits against the end face of the flat plate connector, and a groove is provided on the end face of the concave plate connector for installing a high-pressure sealing ring; both the concave plate connector and the flat plate connector are provided with radially outwardly expanding shoulders; two flange rings are respectively fitted on the outside of the concave plate connector and the flat plate connector, and their inner sides abut against the two shoulders; the two flange rings are connected by a bolt assembly, so that when the bolt assembly is tightened, the two flange rings clamp the two shoulders; an annular groove is provided on the outer wall of the end of the stainless steel pipe, and an O-ring is embedded in the annular groove for radially sealing the connection between the stainless steel pipe and the concave plate connector and the flat plate connector.
[0012] As a further optimization, the concentric ring is fitted on the outside of the joint of the two shoulders, with its two ends fitting with the two flange rings with a clearance.
[0013] As a further optimization, both the concave plate connector and the flat plate connector are made of stainless steel, and their mating end faces are precision-machined surfaces.
[0014] As a further optimization, the bolt assembly, concentric ring, and two flange rings are all made of ordinary steel that is not stainless steel.
[0015] As a further optimization, a sealing retaining ring is also embedded in the annular groove, arranged side by side with the O-ring.
[0016] Compared with existing technologies, the advantages of this utility model are as follows: First, the structure is simple and the reliable sealing ensures excellent sealing performance under ultra-high pressure environments. Second, the two flange rings have sufficient radial dimensions, and the sealing joint does not lose load-bearing capacity: the specially designed connection structure makes the load-bearing capacity of the connection point comparable to that of the pipe body, avoiding the problem of the connection point becoming a weak link in traditional connection methods. Third, it facilitates maintenance and disassembly: the end-face sealing and flange connection design allows for connection or disassembly simply by removing fasteners, simplifying operation and greatly reducing on-site maintenance time and difficulty. Fourth, it reduces costs: compared with high-pressure hoses, rigid pipe systems have a higher initial investment but a longer lifespan, resulting in significantly lower long-term maintenance costs. Fifth, due to the large size of steel pipes, precision machining is not possible; however, after precision machining of the flat plate seal and concave plate seal, combined with a high-pressure resistant sealing ring, a reliable sealing connection can be achieved. Sixth, there is no reduction in the orifice diameter at the connection point, and there is no pressure loss at this location. Seventh, it improves operational safety: it reduces the risk of hose rupture and improves the safety of high-pressure cleaning operations. Eighth, it improves work efficiency: the inner diameter of the rigid pipe can be made larger, reducing fluid resistance and improving work efficiency.
[0017] In summary, this utility model, through its split design, possesses the advantages of good sealing performance, pressure resistance, easy disassembly and assembly, and low cost, making it suitable for application in the field of high-pressure water cleaning. Attached Figure Description
[0018] Figure 1 This is a three-dimensional structural diagram of an embodiment of the present utility model;
[0019] Figure 2 This is a cross-sectional structural diagram of an embodiment of the present invention.
[0020] The correspondence between the technical features in the figure and the reference numerals is as follows: 1. Stainless steel pipe; 11. O-ring seal; 12. Sealing retainer; 2. Concave plate connector; 21. High-pressure seal; 3. Flat plate connector; 4. Shoulder; 5. Flange ring; 51. Bolt assembly; 6. Concentric ring. Detailed Implementation
[0021] The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some preferred embodiments of this utility model, and not all embodiments. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of this utility model, and are not intended to limit the protection scope of this utility model.
[0022] Example: Please refer to Figure 1-2 This utility model provides the following technical solution: an ultra-high pressure stainless steel pipe sealing connection structure, comprising a stainless steel pipe 1 with external threads at both ends; two stainless steel pipes 1 are respectively threadedly connected to a concave plate connector 2 and a flat plate connector 3; both the concave plate connector 2 and the flat plate connector 3 are machined with internal threads corresponding to the stainless steel pipes 1; the end face of the concave plate connector 2 fits against the end face of the flat plate connector 3, and a groove is provided on the end face of the concave plate connector 2 for installing a high-pressure sealing ring 21; the joint between the concave plate connector 2 and the flat plate connector 3... Each has a radially outwardly expanding shoulder 4; two flange rings 5 are respectively fitted on the outside of the concave plate connector 2 and the flat plate connector 3, and their inner sides abut against the two shoulders 4 respectively; the two flange rings 5 are connected by a bolt assembly 51, so that when the bolt assembly 51 is tightened, the two flange rings 5 clamp the two shoulders 4; an annular groove is provided on the outer wall of the end of the stainless steel pipe 1, and an O-ring seal 11 is embedded in the annular groove for radially sealing the connection between the stainless steel pipe 1 and the concave plate connector 2 and the flat plate connector 3.
[0023] The sealing principle is as follows: the concave plate connector 2 and the flat plate connector 3 are clamped together by a pair of flange rings 5, achieving a surface seal through tight contact between the two end faces. The large contact area results in a good sealing effect. Simultaneously, the radial O-ring seal 11 provides an elastic seal, further enhancing the sealing performance under high pressure. As the system pressure increases, the pressure between the end faces also increases, creating a self-tightening seal. The cylindrical and flat plate seals further strengthen the sealing effect, ensuring no leakage occurs under ultra-high pressure conditions. In practical applications, this connection structure is suitable for pressure ranges up to 200 MPa, and different materials for seals and fasteners can be selected according to specific operating conditions. For higher pressure environments, the number of sealing rings can be increased or the sealing structure dimensions adjusted to further improve sealing reliability.
[0024] The working principle for cost reduction is as follows: The stainless steel pipe 1 is a slender part. If its end is integrally formed, the processing difficulty will be significantly increased, precision will be difficult to guarantee, and processing costs will increase. Therefore, in this embodiment, the stainless steel pipe 1 only has threads processed at its end, and the threads at both ends are identical, making processing convenient and reducing costs. The concave plate connector 2 and the flat plate connector 3 are small in size, facilitating precision machining, especially the end face machining, ensuring sealing while reducing processing costs. Since they come into contact with the cleaning fluid inside the pipe, stainless steel is preferred. Other clamping mechanisms, such as the flange ring 5, do not come into contact with the cleaning fluid and can be made of ordinary steel, not necessarily stainless steel, allowing for lower processing precision and further cost reduction. It is particularly noteworthy that compared to the expensive imported ultra-high pressure hoses that are typically required to ensure construction safety, the rigid pipe system used in this invention demonstrates a cost advantage from the initial investment. High-quality ultra-high pressure hoses can cost up to 1000 yuan / meter, while stainless steel rigid pipes cost over 200 yuan / meter. Therefore, the split-type connection components are the main technical means of cost reduction.
[0025] The working principle behind the ease of assembly and disassembly is that the concave plate connector 2 and the flat plate connector 3 are separate structures from the stainless steel pipe 1. However, on the construction site, after the two ends of the stainless steel pipe 1 are threadedly connected to the concave plate connector 2 and the flat plate connector 3 respectively, frequent disassembly and assembly are no longer necessary. They become a single unit with the stainless steel pipe 1, reducing the number of parts to be disassembled and improving convenience. Secondly, if the concave plate connector 2 and the flat plate connector 3 have flanges, the bolt holes on the two flanges may be misaligned, even if the stainless steel pipe 1 is properly threaded. To align the bolt holes, frequent adjustments to the two threaded connections are required, making installation inconvenient. In this embodiment, the two flange rings 5 are separate structures from the concave plate connector 2 and the flat plate connector 3. This allows for easy adjustment of the bolt holes on the two flanges to a coaxial position during installation, provided the stainless steel pipe 1 is properly threaded, facilitating bolt passage and making installation quick and easy. In practical applications, this has significant economic and technical advantages compared to traditional flexible hoses. Taking a typical high-pressure cleaning system as an example, the initial investment of the rigid pipe system connected in this embodiment is 20%-30% higher than that of the flexible hose, but the service life can be extended by 3-5 times, the maintenance cost is reduced by about 50%, the work efficiency is increased by 15%-20%, and the safety is significantly enhanced.
[0026] It is evident that when the two flange rings 5 are bolted on, the concave plate connector 2 and the flat plate connector 3 may not be concentric. However, when multiple bolts are installed on the two flange rings 5, the center holes of the two flange rings 5 can be ensured to be concentric, thereby limiting the concave plate connector 2 and the flat plate connector 3 to ensure concentricity. To further improve installation convenience, a concentric ring 6 is fitted onto the outer side of the mating joint of the two shoulders 4, with its two ends in clearance fit with the two flange rings 5. This does not hinder the flange rings 5 from clamping the shoulders 4. In the initial stage of installation, the concentric ring 6 acts as a clamping component, limiting the concave plate connector 2 and the flat plate connector 3 to ensure concentricity, facilitating bolt hole alignment and improving installation efficiency. Preferably, the concentric ring 6 is made of ordinary steel, not stainless steel.
[0027] To further improve the sealing performance, a sealing retaining ring 12 is also embedded in the annular groove, arranged side by side with the O-ring 11.
[0028] The advantages of this embodiment include, but are not limited to, those shown below.
[0029] First, its simple structure and reliable sealing ensure excellent sealing performance under ultra-high pressure environments.
[0030] Second, the two flange rings 5 have sufficient radial dimensions, and the sealing joint position does not lose load-bearing capacity: the specially designed connection structure makes the load-bearing capacity of the connection point comparable to that of the pipe body, avoiding the problem of the connection point becoming a weak link in the traditional connection method.
[0031] Third, it is easy to maintain and disassemble: the end face sealing and flange connection design can be used to complete the connection or disassembly by simply removing the fasteners, which is simple to operate and greatly reduces the time and difficulty of on-site maintenance.
[0032] Fourth, reduced costs: Compared to high-pressure hoses, rigid tubing systems have a higher initial investment but a longer lifespan, resulting in significantly lower long-term maintenance costs.
[0033] Fifth, since steel pipes are too large to be precisely machined, the flat plate seal and the concave plate seal, after being precisely machined, can achieve a reliable sealing connection when combined with the high-pressure resistant sealing ring 21.
[0034] Sixth, the aperture at the connection point is not reduced, and there is no pressure loss at this location;
[0035] Seventh, improved operational safety: reduced the risk of hose bursting, thus improving the safety of high-pressure cleaning operations;
[0036] Eighth, improve work efficiency: The inner diameter of rigid pipes can be made larger, which reduces fluid resistance and improves work efficiency.
[0037] In summary, this device, through its split design, possesses the advantages of good sealing performance, pressure resistance, easy disassembly and assembly, and low cost, making it suitable for application in the field of high-pressure water cleaning.
[0038] The parts of this utility model not described in detail are prior art; for those skilled in the art, the technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered within the scope of this specification. The scope of this utility model is defined by the appended claims and their equivalents.
Claims
1. A sealing connection structure for ultra-high pressure stainless steel pipes, comprising a stainless steel pipe (1) with external threads at both ends; characterized in that: The two stainless steel pipes (1) are respectively threaded to the concave plate connector (2) and the flat plate connector (3); the end face of the concave plate connector (2) is in contact with the end face of the flat plate connector (3), and a groove is provided on the end face of the concave plate connector (2) for installing the high pressure sealing ring (21); Both the concave plate connector (2) and the flat plate connector (3) are provided with radially outwardly expanding shoulders (4); two flange rings (5) are respectively fitted on the outside of the concave plate connector (2) and the flat plate connector (3), and their inner sides abut against the two shoulders (4); the two flange rings (5) are connected by bolt assembly (51) so that when the bolt assembly (51) is tightened, the two flange rings (5) clamp the two shoulders (4); An annular groove is provided on the outer wall of the end of the stainless steel pipe (1), and an O-ring (11) is embedded in the annular groove.
2. The ultra-high pressure stainless steel pipe sealing connection structure according to claim 1, characterized in that: The concentric ring (6) is fitted on the outside of the mating point of the two shoulders (4), and its two ends are fitted with the two flange rings (5) with clearance.
3. The ultra-high pressure stainless steel pipe sealing connection structure according to claim 2, characterized in that: Both the concave plate connector (2) and the flat plate connector (3) are made of stainless steel, and their mating end faces are precision machined surfaces.
4. The ultra-high pressure stainless steel pipe sealing connection structure according to claim 3, characterized in that: The bolt assembly (51), concentric ring (6) and two flange rings (5) are all made of ordinary steel, not stainless steel.
5. The ultra-high pressure stainless steel pipe sealing connection structure according to claim 1, characterized in that: The annular groove is also fitted with a sealing retainer ring (12) arranged side by side with the O-ring (11).