High-temperature-resistant and high-pressure-resistant rotary joint

Abstract

The utility model relates to a high-temperature-resistant and high-pressure-resistant rotary joint, and aims to solve the problem that an air inlet end and an air outlet pipe of the conventional rotary joint are generally of an integrated structure, and the air inlet end and the air outlet pipe cannot be separated in the use process, so that an air heater cannot be flexibly switched between being put into use and not being put into use. Comprising an air inlet pipe, a sealing gland, an air outlet pipe, spacer rings and sealing rings, a plurality of sealing rings are arranged on the inner wall of the air outlet pipe, a spacer ring is arranged between every two adjacent sealing rings, a sealing gland is inserted into the air outlet pipe, the sealing gland abuts against the sealing ring located at the end, an air inlet pipe is inserted into the sealing gland, the air inlet pipe is connected with the air outlet pipe in a sealed mode through the sealing rings, the sealing rings are graphite sealing rings, and the number of the sealing rings is 2-5. A limiting ring is installed in the air outlet pipe, and the limiting ring abuts against the sealing ring located at the end of the limiting ring.

Description

Technical Field

[0001] This utility model relates to the field of steam rotary joint technology, and in particular to a high-temperature and high-pressure resistant rotary joint. Background Technology

[0002] The rotary air heater is a key heat exchange device in the boiler system of a thermal power plant, used to increase the inlet air temperature. It preheats the combustion air entering the furnace by recovering waste heat from the flue gas at the boiler tail, thereby significantly improving combustion efficiency and reducing exhaust heat loss. Its core function is to achieve efficient heat exchange between high-temperature flue gas and cold air under dynamic operating conditions. To ensure the continuous and sealed supply of high-temperature, high-pressure gas at the outlet of the rotary air heater, high-pressure rotary joints need to be installed at the inlet and outlet of the heater to achieve continuous gas delivery. The high-pressure rotary joint is a key component used to achieve a dynamic and sealed connection between the pipeline and the rotating equipment during high-temperature, high-pressure gas transmission, mainly solving the problem of safe gas delivery when the rotating equipment is continuously rotating. Its core function is to ensure continuous gas delivery while guaranteeing 360-degree rotation of the equipment, preventing high-temperature, high-pressure gas leakage, and maintaining stable system pressure.

[0003] However, the air inlet and outlet pipes of existing rotary joints are usually an integral structure, and the air inlet and outlet pipes cannot be separated during use, which makes it impossible to flexibly switch the heater between being in use and not in use. Utility Model Content

[0004] This invention addresses the problem that existing rotary joints typically have an integrated air inlet and outlet pipe, which cannot be separated during use, thus hindering the flexible switching of the heater between use and non-use. Therefore, this invention provides a high-temperature and high-pressure resistant rotary joint to solve the problems mentioned in the background section.

[0005] The technical solution of this utility model is:

[0006] A high-temperature and high-pressure resistant rotary joint includes an inlet pipe, a sealing gland, an outlet pipe, a spacer ring, and a sealing ring;

[0007] The inner wall of the air outlet pipe is provided with multiple sealing rings, and a spacer ring is provided between adjacent sealing rings. A sealing cap is inserted into the air outlet pipe, and the sealing cap abuts against the sealing ring located at the end. An air inlet pipe is inserted into the sealing cap, and the air inlet pipe is sealed to the air outlet pipe through the sealing ring.

[0008] Furthermore, the sealing ring is a graphite sealing ring.

[0009] Furthermore, the sealing ring is provided in 2-5 parts.

[0010] Furthermore, a limiting ring is installed in the air outlet pipe, and the limiting ring abuts against the sealing ring located at the end.

[0011] Furthermore, the limiting ring is made of stainless steel.

[0012] Furthermore, the sealing cap, spacer ring, and limiting ring are fitted with the intake pipe with a clearance.

[0013] Furthermore, the sealing cap and the vent pipe are overfitted.

[0014] Furthermore, a fixed flange I is provided on the air inlet pipe, and a fixed flange II is provided on the air outlet pipe.

[0015] Furthermore, the sealing gland is provided with connecting flange I, and the vent pipe is provided with connecting flange II.

[0016] Furthermore, the sealing cap and the vent pipe are detachably fixedly connected.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] 1. A high-temperature and high-pressure resistant rotary joint, wherein the air inlet pipe and the sealing gland can rotate relative to each other through a clearance fit; the air inlet pipe and the air outlet pipe are sealed together by a graphite sealing ring, which can ensure the sealing connection while allowing the air inlet pipe and the air outlet pipe to rotate relative to each other; and the air inlet pipe and the air outlet pipe can achieve a sealed connection without circumferential limiting parts, thereby enabling the air heater to be flexibly switched between being in use and not in use by simply plugging and unplugging the air inlet pipe and the air outlet pipe.

[0019] 2. The intake pipe and the exhaust pipe are separate structures. This structural design eliminates the thermal expansion caused by the steam during the conduction process, while also ensuring continuous rotation.

[0020] 3. A spacer ring is provided between adjacent graphite sealing rings. The spacer ring reduces the frictional resistance during rotation by separating the adjacent graphite sealing rings. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this utility model.

[0022] In the diagram: 1. Inlet pipe; 2. Sealing gland; 3. Outlet pipe; 4. Spacer ring; 5. Sealing ring; 6. Limiting ring; 7. Fixed flange I; 8. Fixed flange II; 9. Connecting flange I; 10. Connecting flange II. Detailed Implementation

[0023] Specific implementation method one: See Figure 1 As shown, a high-temperature and high-pressure resistant rotary joint, in this embodiment, includes an air inlet pipe 1, a sealing gland 2, an air outlet pipe 3, a spacer ring 4, and a sealing ring 5;

[0024] Multiple sealing rings 5 ​​are provided on the inner wall of the air outlet pipe 3, and a spacer ring 4 is provided between adjacent sealing rings 5. A sealing cap 2 is inserted into the air outlet pipe 3, and the sealing cap 2 abuts against the sealing ring 5 located at the end. An air inlet pipe 1 is inserted into the sealing cap 2, and the air inlet pipe 1 is sealed to the air outlet pipe 3 through the sealing rings 5.

[0025] Furthermore, the intake pipe 1, sealing cap 2, and exhaust pipe 3 are all tubular structures and concentrically arranged. Sealing cap 2 is inserted into exhaust pipe 3, and intake pipe 1 is inserted into sealing cap 2. Sealing cap 2 is detachably fixed to exhaust pipe 3, serving to fix sealing ring 5. During assembly, sealing ring 5 and spacer ring 4 are alternately inserted into exhaust pipe 3, maintaining their concentricity relative to exhaust pipe 3. Sealing cap 2 is used to press down on the end of sealing ring 5, thus fixing it. Spacer ring 4 separates sealing ring 5, preventing contact between spacer ring 4 and intake pipe 1. By using spacer ring 4, the contact area between sealing ring 5 and intake pipe 1 is reduced without decreasing the width of sealing ring 5, thereby reducing friction between intake pipe 1 and exhaust pipe 3. The air inlet pipe 1 and the sealing cap 2 are clearance-fitted, allowing them to rotate relative to each other and be plugged in and out. The top of the air inlet pipe 1 has a chamfer, which facilitates insertion between the air inlet pipe 1 and the sealing cap 2, reducing impact during insertion. The chamfer also facilitates insertion with the graphite sealing ring. Because the graphite sealing ring is soft, if the top of the air inlet pipe 1 had a sharp point, it would cut the graphite sealing ring upon contact, causing damage and reducing the sealing effect. Since the axial distance between the air inlet pipe 1 and the air outlet pipe 3 is relatively fixed, even in a high-pressure environment, the air inlet pipe 1 and the air outlet pipe 3 can maintain a sealed connection without circumferential limiting components when the heater is not moved. This allows for flexible switching between using and not using the heater simply by plugging and unplugging the air inlet and outlet pipes. This invention sets the air inlet pipe 1 and the air outlet pipe 3 as separate structures. This structural design eliminates the thermal expansion caused by the overall steam during the conduction process, while also allowing for continuous rotation.

[0026] Specific Implementation Method Two: See Figure 1 As shown, the sealing ring 5 in this embodiment is a graphite sealing ring.

[0027] Specific implementation method three: See Figure 1 As shown, the sealing ring 5 in this embodiment is provided with 2-5 rings.

[0028] Furthermore, graphite sealing rings are high-performance sealing elements widely used in high-temperature and high-pressure environments. This novel design utilizes the adaptive sealing mechanism and self-lubricating properties of graphite sealing rings for rotational sealing between the inlet pipe 1 and the outlet pipe 3, achieving long-term stable operation without additional lubrication.

[0029] Detailed Implementation Method Four: See [link] Figure 1 As shown, in this embodiment, a limiting ring 6 is installed in the air outlet pipe 3, and the limiting ring 6 abuts against the sealing ring 5 located at the end.

[0030] Specific implementation method five: See Figure 1 As shown, the limiting ring 6 in this embodiment is made of stainless steel.

[0031] Furthermore, a limiting ring 6 is installed inside the vent pipe 3 to cooperate with the sealing cap 2 to fix the sealing ring 5. One end of the limiting ring 6 abuts against the inner wall of the vent pipe 3, and the other end of the limiting ring 6 abuts against the sealing ring 5 located at the right end. The sealing cap 2 is used to abut against the sealing ring 5 located at the left end, thus completing the fixation of the sealing ring 5. As an alternative implementation, the limiting ring 6 can be a boss integrally formed with the vent pipe 3, which abuts against the sealing ring 5 located at the right end, also achieving the fixation of the sealing ring 5. The limiting ring 6 is made of stainless steel to reduce corrosion of parts in high-temperature steam environments.

[0032] Specific implementation method six: See Figure 1 As shown, in this embodiment, the sealing cap 2, the spacer ring 4, and the limiting ring 6 are fitted with the air intake pipe 1 with a clearance.

[0033] Detailed implementation method seven: See Figure 1 As shown, the sealing cap 2 and the vent pipe 3 in this embodiment are fitted together.

[0034] Furthermore, the sealing cap 2, the spacer ring 4, and the limiting ring 6 are fitted with the air inlet pipe 1 with a clearance, so that the air inlet pipe 1 and the air outlet pipe 3 can be rotated relative to each other and connected by insertion and removal.

[0035] Detailed Implementation Method Eight: See also Figure 1 As shown, in this embodiment, the air inlet pipe 1 is provided with a fixed flange I7, and the air outlet pipe 3 is provided with a fixed flange II8.

[0036] Detailed Implementation Method Nine: See also Figure 1 As shown, the sealing cap 2 in this embodiment is provided with a connecting flange I9, and the air outlet pipe 3 is provided with a connecting flange II10.

[0037] Detailed Implementation Method Ten: See [link / details] Figure 1 As shown, the sealing cap 2 and the vent pipe 3 in this embodiment are detachably fixedly connected.

[0038] Furthermore, fixed flange I7 and fixed flange II8 are used for the detachable fixed connection of the sealing gland 2 and the air outlet pipe 3, facilitating quick replacement of the graphite sealing ring after wear. Connecting flange I9 and connecting flange II10 are used for the fixed connection of the air inlet pipe 1 and the air outlet pipe 3 to the air inlet and air outlet of the heater.

[0039] In use, after inserting the air inlet pipe 1 into the air outlet pipe 3, the relative distance between the sealing cap 2 and the air outlet pipe 3 is tightened by fasteners. The sealing cap 2 compresses the graphite sealing ring, causing the graphite sealing ring to deform and tighten around the air inlet pipe 1 to achieve a seal.

[0040] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A high-temperature and high-pressure resistant rotary joint, characterized in that: It includes an intake pipe (1), a sealing cap (2), an exhaust pipe (3), a spacer ring (4), and a sealing ring (5); Multiple sealing rings (5) are provided on the inner wall of the air outlet pipe (3), and a spacer (4) is provided between adjacent sealing rings (5). A sealing cap (2) is inserted into the air outlet pipe (3), and the sealing cap (2) abuts against the sealing ring (5) located at the end. An air inlet pipe (1) is inserted into the sealing cap (2), and the air inlet pipe (1) is sealed to the air outlet pipe (3) through the sealing ring (5).

2. The high-temperature and high-pressure resistant rotary joint according to claim 1, characterized in that: The sealing ring (5) is a graphite sealing ring.

3. The high-temperature and high-pressure resistant rotary joint according to claim 1, characterized in that: The sealing ring (5) is provided in 2-5 parts.

4. The high-temperature and high-pressure resistant rotary joint according to claim 1, characterized in that: A limiting ring (6) is installed in the air outlet pipe (3), and the limiting ring (6) abuts against the sealing ring (5) located at the end.

5. The high-temperature and high-pressure resistant rotary joint according to claim 4, characterized in that: The limiting ring (6) is made of stainless steel.

6. The high-temperature and high-pressure resistant rotary joint according to claim 4, characterized in that: The sealing cap (2), the spacer ring (4), and the limiting ring (6) are fitted with the air intake pipe (1) with clearance.

7. The high-temperature and high-pressure resistant rotary joint according to claim 1, characterized in that: The sealing cap (2) and the vent pipe (3) are fitted together.

8. The high-temperature and high-pressure resistant rotary joint according to claim 1, characterized in that: The air inlet pipe (1) is provided with a fixed flange I (7), and the air outlet pipe (3) is provided with a fixed flange II (8).

9. The high-temperature and high-pressure resistant rotary joint according to claim 1, characterized in that: The sealing cap (2) is provided with a connecting flange I (9), and the air outlet pipe (3) is provided with a connecting flange II (10).

10. The high-temperature and high-pressure resistant rotary joint according to claim 9, characterized in that: The sealing cap (2) and the vent pipe (3) are detachably fixedly connected.

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