Rotary joint for paddle type dryer

Abstract

The invention discloses a rotary joint for a paddle dryer, which comprises a rotor, and the outer side surface of the rotor is sequentially sleeved with a sealing ring and an end cover; the rotor is provided with a compensation mechanism, and the compensation mechanism makes contact with the back face of the sealing ring and is used for pushing the sealing ring. The front face of the sealing ring is arranged to be an outwards-protruding spherical face. The back face of the end cover is arranged to be an inwards-concave spherical face and is attached to the front face of the sealing ring to form sealing. The rotary joint solves the problems that an existing rotary joint is fast in abrasion, poor in sealing, prone to air leakage, unsmooth in condensate water discharge, poor in heat exchange effect and the like.

Description

Technical Field

[0001] The invention relates to a paddle dryer technology in the sludge treatment industry, and more particularly to a rotary joint for a paddle dryer. Background Art

[0002] After the rotary joint has been used for a period of time, the equipment cannot work properly due to steam leakage from the outer tube and no condensate is discharged from the inner tube. Figures 1 to 3 As shown, the existing rotary joint includes a rotor 1, an end cover 2, a stator 3, a spring 4 and a sealing ring 5. The rotor 1 is compensated by a compensation mechanism composed of a single large spring 4 (wire diameter φ8mm, middle diameter φ160), which pushes the rotor 1 so that the positive spherical surface on the rotor 1 fits with the arc surface on the sealing ring 5, so that the rotor 1 always maintains a sealed state in the rotating state. The sealing structure consists of the positive spherical surface on the rotor 1, the arc surface on the sealing ring 5 and the end cover 2. The spherical surface between the positive spherical surface on the rotor 1 and the arc surface on the sealing ring 5 is the sealing surface. The sealing ring 5 is formed by pressing and grinding graphite. The material has poor rigidity and is easy to deform. The reverse spherical surface (concave surface) on the sealing ring 5 weakens the strength of the seal and is easy to deform. The deformed sealing ring 5 can easily cause leakage accidents. After the leakage, only some simple repairs can be done, and it must rely on imports to completely solve it. Summary of the invention

[0003] In view of the defects existing in the prior art, the purpose of the present invention is to provide a rotary joint for a paddle dryer, which solves the problems of the existing rotary joints such as fast wear, poor sealing, easy air leakage, poor condensate discharge, and poor heat exchange effect.

[0004] To achieve the above object, the present invention adopts the following technical solution:

[0005] A rotary joint for a paddle dryer, comprising a rotor, wherein a sealing ring and an end cover are sequentially mounted on the outer side of the rotor;

[0006] The rotor is provided with a compensation mechanism, which contacts the back side of the sealing ring to push the sealing ring;

[0007] The front surface of the sealing ring is configured as an outwardly convex spherical surface;

[0008] The back surface of the end cover is configured as a concave spherical surface, which fits with the front surface of the sealing ring to form a seal.

[0009] Preferably, the compensation mechanism comprises a base, a spring and a stopper;

[0010] The base and the stopper are both mounted on the outer surface of the rotor;

[0011] The springs are provided in plurality, all of which are arranged outside the rotor and evenly arranged around the horizontal axis of the rotor;

[0012] One end of the spring is in contact with the base, and the other end is in contact with the stopper;

[0013] The stopper contacts the back surface of the sealing ring.

[0014] Preferably, the springs are provided with 8 pieces, the wire diameters of all the springs are 3 mm, and the median diameters of all the springs are 16 mm.

[0015] Preferably, the sealing ring is formed by pressing and grinding graphite.

[0016] Preferably, a stator is also mounted on the outer side of the rotor.

[0017] The present invention provides a rotary joint for a paddle dryer. Without changing the main equipment structure in the prior art, the internal sealing structure of the rotary joint of the dryer is optimized, and the modification is performed in the simplest construction method and at the lowest cost to improve the leakage and heat exchange problems caused by the deformation and damage of the sealing ring. The seal of the rotary joint of the present invention is not easy to deform, and the sealing is reliable; the sealing structure has greater pressure resistance, and provides protection for the high temperature and high pressure required for online speed-up. Ensure that steam does not leak into the outer tube of the rotary joint, and the condensed water in the inner tube can be discharged smoothly. At the same time, it can also effectively improve the production and operation stability and safety of the paddle dryer in the sludge treatment industry, and reduce the operation and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of an existing rotary joint;

[0019] Figure 2 It is a schematic diagram of the seal formed between the rotor, the end cover and the sealing ring in the existing rotary joint;

[0020] Figure 3 is a schematic diagram of a spring in an existing rotary joint;

[0021] Figure 4 It is a structural schematic diagram of the rotary joint of the present invention;

[0022] Figure 5 It is a schematic diagram of the seal formed between the rotor, the end cover and the sealing ring in the rotary joint of the present invention;

[0023] Figure 6 is a schematic diagram of a spring in a rotary joint of the present invention;

[0024] Figure 7 It is a schematic diagram of the working principle of the rotary joint of the present invention. DETAILED DESCRIPTION

[0025] In order to better understand the above technical solution of the present invention, the technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0026] Combination Figures 4 to 6 As shown, a rotary joint for a paddle dryer provided by the present invention comprises a rotor 10, and a sealing ring 11 and an end cover 12 are sequentially mounted on the outer surface of the rotor 10.

[0027] The rotor 10 is provided with a compensation mechanism, which contacts the back side of the sealing ring 11 to push the sealing ring 11 .

[0028] The front surface of the sealing ring 11 is set to be an outwardly convex spherical surface (true spherical surface).

[0029] The back surface of the end cover 12 is set as a concave spherical surface (reverse spherical surface), which fits with the positive spherical surface of the sealing ring 11, so that the rotor 11 always maintains a sealed state when rotating.

[0030] The spherical surface between the positive spherical surface of the sealing ring 11 and the negative spherical surface of the end cover 12 is a sealing surface.

[0031] The sealing ring 11 is formed by pressing and grinding graphite, which has poor rigidity and is easy to deform. However, the true spherical structure of the sealing ring 11 makes up for the defects of poor rigidity and easy deformation, thereby extending the service life of the sealing surface.

[0032] The compensation mechanism includes a base 13 , a spring 14 and a stopper 15 .

[0033] The base 13 and the stopper 15 are both mounted on the outer surface of the rotor 10 .

[0034] There are multiple springs 14, all located on the outside of the rotor 10 and evenly arranged around the horizontal axis of the rotor. The multiple springs 14 push the block 15 to compensate the sealing ring 11. The compensation mechanism of multiple springs 14 has uniform sealing surface loading force and better compensation sealing performance.

[0035] One end of the spring 14 contacts the base 13 , and the other end contacts the stopper 15 .

[0036] The stopper 15 contacts the back surface of the seal ring 11 .

[0037] The spring 14 is composed of 8 small springs, the wire diameters of the 8 springs 14 are all 3 mm, and the middle diameters are all 16 mm. Compared with the existing compensation mechanism formed by a single large spring, the sealing surface loading force is more uniform.

[0038] A stator 16 is also mounted on the outer side of the rotor 10 to seal the compensation mechanism.

[0039] Combination Figure 7 As shown, the working principle of the rotary joint of the present invention is as follows:

[0040] Saturated steam flows into the outer tube 18 through the steam inlet 17 and then flows into the container to diffuse. As the saturated steam continues to flow into the container, the pressure gradually increases, and the saturated steam is liquefied into condensed water. When the condensed water level rises to a certain level, the condensed water flows out through the inner tube 19.

[0041] The rotary joint of the present invention is one of the key components of the paddle dryer. Each hollow rotating paddle main shaft is equipped with a rotary joint of the present invention. When the dryer paddle shaft rotates to stir and push the sludge, the rotary joint of the present invention is in a static state. Steam (0.9Mpa, 180°C) is transmitted to the middle of the paddle main shaft and the paddle through the rotary joint of the present invention, and the heat energy is transferred to the sludge in an indirect heating manner. The steam in the hollow rotating paddle main shaft gradually turns into condensed water after releasing latent heat as the drying heat transfer and heat loss are released. The condensed water passes through the rotary joint of the present invention from the shaft and is discharged by the siphon principle, so that the dryer paddle and the wet sludge can be stirred and pushed in a relatively stable temperature condition to continuously and evenly exchange heat. If leakage occurs, it will cause poor drainage of condensed water, directly causing a decrease in the heat exchange efficiency of the paddle shaft, resulting in mud sticking to the dryer main shaft and affecting the operation of the dryer.

[0042] In summary, the present invention changes the direction of the sealing surface, changes the end cover 12 with good rigidity and good wear resistance into an inverted spherical surface, and changes the sealing ring 11 into a positive spherical surface to overcome the defects of poor rigidity and easy deformation of graphite material; changes the compensation structure of the spring 14, the spring 14 is a plurality of small springs, and the multi-spring compensation has a uniform loading force on the sealing surface, and the sealing graphite is more wear-resistant. It overcomes the defect of uneven loading force on the sealing surface compensated by a single large spring. Therefore, the inverted spherical design is adopted, and the inverted spherical seal has a greater pressure resistance, which provides protection for the high temperature and high pressure required for online speed-up. After all the sealing surfaces are heat-treated and ground and assembled, the sealing stability is better. With multiple spring compensation, the sealing surface loading force is uniform, and the sealing graphite is more wear-resistant.

[0043] Those skilled in the art should recognize that the above embodiments are only used to illustrate the present invention, and are not intended to limit the present invention. As long as they are within the spirit of the present invention, any changes or modifications to the above embodiments will fall within the scope of the claims of the present invention.

Claims

1. A rotary joint for a paddle dryer, characterized in that: It comprises a rotor, on the outer side of which a sealing ring and an end cover are sequentially mounted; The rotor is provided with a compensation mechanism, which contacts the back side of the sealing ring to push the sealing ring; The front surface of the sealing ring is configured as an outwardly convex spherical surface; The back surface of the end cover is configured as a concave spherical surface, which fits with the front surface of the sealing ring to form a seal.

2. The rotary joint for a paddle dryer according to claim 1, characterized in that: The compensation mechanism includes a base, a spring and a stopper; The base and the stopper are both mounted on the outer surface of the rotor; The springs are provided in plurality, all of which are arranged outside the rotor and evenly arranged around the horizontal axis of the rotor; One end of the spring is in contact with the base, and the other end is in contact with the stopper; The stopper contacts the back surface of the sealing ring.

3. The rotary joint for a paddle dryer according to claim 2, characterized in that: The springs are provided with 8 pieces, all of which have a wire diameter of 3 mm and a center diameter of 16 mm.

4. The rotary joint for a paddle dryer according to claim 1, characterized in that: The sealing ring is formed by pressing and grinding graphite.

5. The rotary joint for a paddle dryer according to claim 1, characterized in that: A stator is also mounted on the outer side of the rotor.

Images