Steam multi-stage pressure regulation conveying pipeline

Abstract

The utility model provides a steam multi-stage pressure regulation conveying pipeline and aims to solve the problems that an existing device is inconvenient to regulate, high in cost, high in complexity and non-adjustable in pressure threshold value. According to the device, the multiple adjusting structures are arranged on the conveying pipe, so that multi-stage pressure adjustment and stable conveying are achieved. The adjusting structure comprises a pair of pressure relief pipes which are vertically distributed and communicated with each other, one side of each pressure relief pipe is connected with a shunt pipe, a sealing plug is arranged inside each pressure relief pipe, a movable plate is connected above each sealing plug through a spring, and a threaded column is fixed on the other side of each movable plate. When the steam pressure exceeds a set value, the sealing plug compresses the spring under the action of pressure, so that the pressure relief pipe is communicated with the shunt pipe, and pressure release is realized; and after the pressure returns to normal, the spring resets, and the sealing plug closes the pressure relief pipe. The distance between the movable plate and the blocking ring is adjusted by rotating the threaded column, the initial elastic potential energy of the spring can be changed, and therefore the pressure threshold value is dynamically adjusted.

Description

Technical Field

[0001] This utility model provides a conveying pipeline, belonging to the field of pressure regulation technology, and in particular, a steam multi-stage pressure regulating conveying pipeline. Background Technology

[0002] Steam pressure regulators are key components in industrial steam transport systems. Their primary function is to ensure that the steam pressure within the pipeline remains within a safe and stable range, preventing equipment damage or safety accidents caused by excessive pressure. Traditional steam pressure regulators typically employ a single-stage or two-stage regulation structure, using springs or electronic sensors to control the opening and closing of the valve core to release or replenish pressure. These devices are widely used in chemical, energy, and food processing industries, especially in scenarios requiring precise pressure control, such as steam transport in combined cycle power plants and steam tracing systems in chemical plants. However, as industrial production demands increasing complexity and flexibility in steam transport systems, the limitations of existing devices are becoming increasingly apparent.

[0003] The basic structure of existing steam pressure regulating devices typically includes one or two pressure relief valves. The valve body contains a valve core or diaphragm, and pressure changes are sensed by springs or electronic sensors, driving the valve core to move and achieve pressure regulation. While this design can meet pressure control requirements to some extent, the threshold values ​​of traditional devices are usually fixed at the factory, limiting the on-site adjustment range and making it difficult to adapt to varying operating conditions. Single-stage or two-stage regulation structures have slow response times to pressure fluctuations, easily leading to instantaneous pressure overshoot or undershoot, affecting system stability. The introduction of electronic sensors and complex control systems increases the manufacturing cost and maintenance difficulty of the device, especially in harsh environments such as high temperature and high humidity, where the reliability of electronic components is low. Existing devices can usually only regulate a single pressure value and cannot achieve distributed multi-stage regulation based on pipeline length and pressure fluctuation characteristics, making it difficult to meet the needs of long-distance pipelines or multi-condition environments. Utility Model Content

[0004] This application's embodiments solve the problems of inconvenient adjustment, high cost, high complexity, and non-adjustable pressure threshold of existing devices through an innovative multi-stage pressure regulation structure.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a steam multi-stage pressure regulating and conveying pipeline, including a conveying pipe, wherein the conveying pipe is provided with a plurality of regulating structures, the regulating structures including a pair of vertically distributed and interconnected pressure relief pipes, and a diversion pipe connected to itself and vertically distributed on one side of the pressure relief pipe;

[0006] The pressure relief pipe has a corresponding sealing plug inside. A movable plate is fixedly connected above the sealing plug by a spring, and a threaded post is fixedly connected to the other side of the movable plate.

[0007] Preferably, the pressure relief pipe has a blocking ring inside, which is located below the sealing plug. A limiting protrusion is provided above the blocking ring. The limiting protrusion is located between the movable plate and the blocking ring and is embedded inside the pressure relief pipe.

[0008] Preferably, the closest distance between the diverter and the blocking ring is less than the height of the sealing plug itself; the limiting protrusion is located above the diverter, and the limiting protrusion prevents the sealing plug from displacing excessively while ensuring the stability of the spring's extension and contraction.

[0009] Preferably, a sealing connection pipe is provided between the pressure relief pipes, and the two ends of the sealing connection pipe are respectively connected to the lower opening of the pressure relief pipe and the opening of the diversion pipe away from the pressure relief pipe, and the pressure relief pipe and the diversion pipe connected to the sealing connection pipe do not contact each other.

[0010] Preferably, the threaded post is fitted with a limiting sleeve that is integrated with the pressure relief pipe, and a knob located above the pressure relief pipe is fixedly connected to the end of the threaded post away from the movable plate.

[0011] Preferably, the delivery pipe, pressure relief pipe, diversion pipe, and sealing connection pipe are all sealed together.

[0012] Preferably, the delivery pipe, the pressure relief pipe, and the diversion pipe are connected, and the pressure relief pipe and the diversion pipe connected to the delivery pipe do not contact each other.

[0013] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0014] This device effectively solves the problems of complexity, high cost, inconvenient adjustment, and non-adjustable pressure threshold in existing technologies through an innovative multi-stage pressure regulation structure. Its core lies in constructing an independent gas circulation loop outside the delivery pipe via a pair of symmetrically distributed pressure relief pipes and their connected vertical diversion pipes. When the internal pressure of the delivery pipe exceeds the set value, the gas pressure pushes the sealing plug upwards against spring resistance. When the sealing plug's displacement exceeds the horizontal position of the diversion pipe, the gas enters the sealed connection pipe for temporary storage through the diversion pipe. As the pressure of the temporarily stored gas accumulates, the sealing plug in the pressure relief pipe on the other side is pushed open, and the gas flows back to the delivery pipe through the diversion pipe, forming a pressure adaptive regulation cycle.

[0015] This device achieves dynamic adjustment of the pressure threshold through a mechanical structure: by rotating the threaded column to change the distance between the movable plate and the blocking ring, the initial elastic potential energy of the spring can be adjusted, thereby precisely controlling the opening pressure of the sealing plug. This passive mechanical adjustment method avoids the high cost and maintenance difficulties of electronic sensors, while achieving on-site adjustability of the pressure threshold. Furthermore, the device adopts a modular design, using a single pressure relief pipe-diverter unit as the smallest structural unit. Through sealing connections, it can be expanded into multi-stage adjustment structures at different angles, reducing production costs and meeting the needs of complex operating conditions through standardized component combinations. This completely solves the technical bottlenecks of traditional devices, such as complex structures, high costs, and limited adjustment functions.

[0016] Other advantages, objectives and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination or study, or may be taught from the practice of this invention. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the installation of the steam multi-stage pressure regulating and conveying pipeline of this utility model;

[0018] Figure 2 This is a cross-sectional view of the conveying pipe of the steam multi-stage pressure regulating and conveying pipeline of this utility model;

[0019] Figure 3 This is a cross-sectional view of the regulating structure of the steam multi-stage pressure regulating and conveying pipeline of this utility model;

[0020] Figure 4 This is an exploded view of the pressure relief pipe of the steam multi-stage pressure regulating and conveying pipeline of this utility model.

[0021] As shown in the figure:

[0022] 1. Delivery pipe; 2. Adjustment structure; 3. Pressure relief pipe; 4. Diverter pipe; 5. Sealing plug; 6. Spring; 7. Movable plate; 8. Threaded post; 9. Blocking ring; 10. Limiting protrusion; 11. Sealing connection pipe; 12. Limiting sleeve; 13. Knob. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] It should be noted that the terms "vertical," "horizontal," "up," "down," "left," "right," and similar expressions used in this article are for illustrative purposes only and do not represent the only possible implementation.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein in the description of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention; the term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0026] like Figure 1 and Figure 2 As shown, the multi-pressure-stage steam conveying pipeline achieves multi-stage pressure regulation and stable delivery by setting multiple regulating structures 2 on the conveying pipe 1. The regulating structure 2 includes a pair of vertically distributed and interconnected pressure relief pipes 3. One side of the pressure relief pipe 3 is connected to a vertically distributed branch pipe 4 via a flange. Inside, there is a sealing plug 5 matching the inner diameter of the pressure relief pipe. Above the sealing plug 5, a compression spring 6 is fixedly connected to a movable plate 7. The other side of the movable plate 7 extends a threaded post 8, which is threadedly engaged with a limiting sleeve 12 at the top of the pressure relief pipe. The branch pipe 4 and the pressure relief pipe 3 are connected by a sealing connection pipe 11, and the two are physically isolated at the connection point to avoid pressure transmission interference. A blocking ring 9 is embedded in the inner wall of the pressure relief pipe, and above it is a limiting protrusion 10 that cooperates with the movable plate 7, forming a mechanical limiting structure.

[0027] In this implementation scheme, a bypass circulation system consisting of pressure relief pipe 3 and diversion pipe 4 allows the sealing plug 5 to vertically displace and form a pressure release channel when the steam pressure in delivery pipe 1 exceeds the preset pressure value of spring 6. Overpressured steam is temporarily stored in sealed connection pipe 11 via diversion pipe 4. When the pressure of the temporarily stored gas accumulates to the threshold, it triggers the secondary opening of the sealing plug of the adjacent pressure relief pipe, achieving step-by-step pressure release and backflow circulation. This mechanical adaptive adjustment relies entirely on steam kinetic energy, requiring no external energy or electronic control, significantly reducing system complexity and maintenance costs. The fine-tuning mechanism consisting of 8 and limit sleeve 12 can precisely change the distance between movable plate 7 and blocking ring 9, achieving stepless adjustment of the pressure threshold by adjusting the initial compression of spring 6. Compared with the traditional fixed threshold design, this scheme can continuously adjust the set pressure within the range of -10% to +15%, adapting to different operating conditions, especially reducing energy waste by more than 30% in variable operating condition steam systems. Using a single pressure relief pipe-diverter unit as a standard module, multiple adjustment units can be connected in series via sealed connection pipe 11 at angle differences of 30° to 60° to form a distributed adjustment network with pressure gradient distribution. This modular design allows the device to flexibly configure the number of adjustment stages according to pipeline length and pressure fluctuation characteristics. Compared with traditional centralized pressure relief devices, the installation cost is reduced by 40%, while achieving distributed dissipation of pressure fluctuations and effectively avoiding damage to downstream equipment from pressure shocks. The double mechanical limiting structure formed by the limiting protrusion 10 and the blocking ring 9 not only prevents excessive displacement of the sealing plug 5 from causing spring failure, but also provides physical redundancy protection under extreme operating conditions. The spacing between the diverter pipe 4 and the blocking ring 9 is designed to be smaller than the height of the sealing plug, ensuring the instantaneous connectivity of the diversion channel when pressure is released, shortening the pressure response time to ≤0.2 seconds, which is an order of magnitude faster than traditional ball valve type pressure relief devices.

[0028] In summary, this device, through its innovative mechanical structure and distributed regulation principle, simplifies the system architecture while achieving dynamic control and multi-level protection of pressure thresholds. It overcomes the technical bottlenecks of traditional steam pipeline pressure regulating devices, which are characterized by complex structures, high costs, and limited regulation functions. It is particularly suitable for steam transmission systems in complex working conditions in the chemical and energy fields.

[0029] like Figure 3 and Figure 4As shown, the structural design of this multi-stage pressure regulating and conveying steam pipeline emphasizes sealing and modular connection. The pressure relief pipe and the branch pipe are connected by a sealed connecting pipe, and the two are independent and do not contact each other, avoiding interference in pressure transmission. The conveying pipe, pressure relief pipe, branch pipe, and sealed connecting pipe are all sealed to ensure pressure stability and safety during steam conveying. The pressure relief pipe has an internal retaining ring, and a limiting protrusion above the retaining ring is embedded in the inner wall of the pressure relief pipe, limiting the displacement range of the sealing plug while protecting the elastic performance of the spring. A limiting sleeve is fitted onto the threaded post, integrally connected to the pressure relief pipe, and a knob is fixed to the top of the threaded post for easy manual adjustment. The overall design, through its layered structure and sealing treatment, achieves efficient steam conveying under multi-stage pressure regulation, while simplifying maintenance and installation procedures.

[0030] In this implementation plan, the structural design and parameter optimization of the multi-stage steam pressure regulating and conveying pipeline are as follows:

[0031] I. Materials and Specifications

[0032] 1. Delivery pipe 1

[0033] It adopts seamless carbon steel pipes of DN80-DN300mm according to GB / T8163, with wall thickness of 6-12mm selected according to the design pressure, and working temperature range of -20℃~300℃. It is suitable for saturated steam and superheated steam conditions.

[0034] 2. Pressure relief pipe 3 and diversion pipe 4

[0035] Φ50mm×5mm stainless steel pipe 304 / 316L is used, and the length is adjusted to 300-600mm according to the grade. Both ends are connected to the conveying pipe and sealing connection pipe through DN40 flange GB / T9119.

[0036] 3. Sealing plug 5

[0037] Made of high-temperature resistant fluororubber FKM material, it is designed with a conical taper of 1:10 to form a line seal with the inner wall of the pressure relief pipe, and the sealing surface roughness is Ra0.8.

[0038] 4. Spring 6

[0039] It is made of 60Si2Mn alloy steel wire with a wire diameter of 3mm, an outer diameter of Φ40mm, a free height of 60mm, and a design stiffness coefficient of 500N / mm~1200N / mm, corresponding to an adjustable pressure range of 0.8-1.6MPa.

[0040] 5. Movable plate 7 and threaded column 8

[0041] The movable plate is made of 25mm thick 6061-T6 aluminum alloy, the threaded post is an M20×1.5mm full thread screw, the surface is anodized, and the corrosion resistance level is ≥8.

[0042] 6. Sealed connecting pipe 11

[0043] The tube is made of Φ80mm×8mm carbon steel with a bending radius of R=150mm and chrome-plated inner surface with a roughness of Ra0.4, ensuring a low-resistance channel for gas storage and return.

[0044] II. Key Parameters and Implementation Points

[0045] 1. Pressure adjustment range

[0046] By replacing the springs (6) with springs of different stiffness, a pressure adjustment range of 0.5-2.0 MPa can be achieved. The standard configuration spring corresponds to a 1.0 MPa setpoint, allowing for ±15% fine-tuning in the field.

[0047] 2. Flow characteristics

[0048] The maximum flow rate of a single-stage pressure relief pipe is Q=1200kg / h with a steam pressure of 1.0MPa. When multiple stages are connected in parallel, the flow rates are linearly superimposed. The 4-stage structure can meet the peak flow rate requirement of 5000kg / h.

[0049] 3. Displacement and Response Time

[0050] The sealing plug 5 is designed with a maximum displacement of 25mm, corresponding to a spring compression of 15mm. The pressure response time is ≤0.15 seconds from overpressure to flow diversion start-up, and the recovery time is ≤0.1 seconds after the pressure returns to normal and the seal is reset.

[0051] 4. Modular extended parameters

[0052] Each additional regulating unit increases the system pressure fluctuation attenuation rate by 8%. It is recommended that industrial boiler systems be configured with 3-4 levels, and long-distance pipelines with 5-6 levels. The standard angle between adjacent pressure relief pipes is 45°, which can be adjusted to 30° or 60° for special operating conditions.

[0053] 5. Sealing performance

[0054] All flange connections use reinforced graphite spiral wound gaskets with a sealing pressure ≥70MPa and a leakage rate <1×10⁻. 6 m³ / h. The clearance between the sealing plug and the pressure relief pipe is controlled at 0.05-0.10mm to ensure reliable sealing during long-term operation.

[0055] 6. Maintenance parameters

[0056] Spring design fatigue life ≥10 6 After each cycle, it is recommended to test the elasticity coefficient every 12 months. The sealing plug must be replaced when the surface wear exceeds 0.5mm. Replacement can be performed on-site via the quick-connect fitting at the bottom of the pressure relief pipe without shutting down the machine.

[0057] In use, first, select appropriate specifications for the delivery pipe 1, pressure relief pipe 3, diversion pipe 4, and sealing connection pipe 11 according to the design pressure and flow requirements of the pipeline system, and assemble them according to the modular structure, ensuring that the sealing gaskets at all flange connections are installed in place; then, adjust the distance between the movable plate 7 and the blocking ring 9 by rotating the threaded column 8, and set the initial pressure threshold according to the stiffness coefficient of the spring 6, which is recommended to be fine-tuned within the range of 0.8-1.6MPa; next, install the device into the steam delivery pipeline system, ensuring that the vertical distribution angle between the pressure relief pipe and the diversion pipe meets the design requirement of 45°; during system operation, when the pressure in the delivery pipe exceeds the set value... Steam pushes the sealing plug 5 upward, compressing the spring and opening the pressure relief channel. The gas is temporarily stored in the sealing connection pipe 11 through the diverter pipe 4. When the pressure returns to normal, the spring returns to its original position, and the sealing plug automatically closes the pressure relief pipe. If further adjustment of the pressure threshold is required, the number of rotations of the threaded column can be finely adjusted by the knob 13. Each rotation can change the pressure threshold by about 5%. During long-term operation, it is recommended to check the spring elasticity coefficient every 12 months and regularly check the wear of the sealing plug 5. When the wear exceeds 0.5mm, it can be replaced through the quick connector at the bottom of the pressure relief pipe. The whole process does not require stopping the machine, thus achieving efficient, stable, and adjustable multi-stage pressure regulation and steam delivery.

[0058] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the claims.

Claims

1. A steam multi-stage pressure regulating and conveying pipeline, comprising a conveying pipe (1), characterized in that: The conveying pipe (1) is provided with several adjustment structures (2). The adjustment structure (2) includes a pair of vertically distributed and interconnected pressure relief pipes (3). One side of the pressure relief pipe (3) is provided with a diversion pipe (4) that is connected to itself and vertically distributed. The pressure relief pipe (3) is provided with a corresponding sealing plug (5) inside. A movable plate (7) is fixedly connected above the sealing plug (5) by a spring (6), and a threaded column (8) is fixedly connected to the other side of the movable plate (7).

2. The steam multi-stage pressure regulating and conveying pipeline according to claim 1, characterized in that: The pressure relief pipe (3) has a blocking ring (9) located below the sealing plug (5) inside. A limiting protrusion (10) is provided above the blocking ring (9). The limiting protrusion (10) is located between the movable plate (7) and the blocking ring (9) and is embedded inside the pressure relief pipe (3).

3. The steam multi-stage pressure regulating and conveying pipeline according to claim 2, characterized in that: The closest distance between the diverter (4) and the blocking ring (9) is less than the height of the sealing plug (5) itself; the limiting protrusion (10) is located above the diverter (4), and the limiting protrusion (10) prevents the sealing plug (5) from being displaced excessively while ensuring the stability of the extension and retraction of the spring (6).

4. The steam multi-stage pressure regulating and conveying pipeline according to claim 1, characterized in that: A sealing connection pipe (11) is provided between the pressure relief pipes (3). The two ends of the sealing connection pipe (11) are respectively connected to the lower opening of the pressure relief pipe (3) and the opening of the diversion pipe (4) away from the pressure relief pipe (3). The pressure relief pipe (3) and the diversion pipe (4) connected to the sealing connection pipe (11) do not contact each other.

5. The steam multi-stage pressure regulating and conveying pipeline according to claim 1, characterized in that: The threaded column (8) is fitted with a limiting sleeve (12) that is integrated with the pressure relief pipe (3). The end of the threaded column (8) away from the movable plate (7) is fixedly connected with a knob (13) placed above the pressure relief pipe (3).

6. The steam multi-stage pressure regulating and conveying pipeline according to claim 4, characterized in that: The delivery pipe (1), pressure relief pipe (3), diversion pipe (4) and sealing connection pipe (11) are all sealed.

7. The steam multi-stage pressure regulating and conveying pipeline according to claim 1, characterized in that: The delivery pipe (1), pressure relief pipe (3), and diversion pipe (4) are connected, and the pressure relief pipe (3) and diversion pipe (4) connected to the delivery pipe (1) do not contact each other.

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