Rotary joint for paddle type dryer

Abstract

The utility model discloses a rotary joint for a paddle type drying machine, which comprises a rotor, and a sealing ring and an end cover are sequentially sleeved on the outer side surface of the rotor; 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 performance, prone to air leakage, unsmooth in condensate water discharge, poor in heat exchange effect and the like.

Description

Technical Field

[0001] The utility model relates to the technology of paddle dryers in the sludge treatment industry, and more specifically, to a rotary joint for a paddle dryer. Background Art

[0002] After the rotary joint is used for a period of time, due to the leakage of steam from the outer pipe and the failure of the inner pipe to discharge condensate, the equipment cannot work properly. As Figures 1 to 3 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, mean diameter φ160), which pushes the rotor 1 to make the positive spherical surface on the rotor 1 fit with the arc surface on the sealing ring 5, so that the rotor 1 always maintains a sealed state during rotation. The sealing structure is composed of the positive spherical surface on the rotor 1, the arc surface on the sealing ring 5 and the end cover 2, and 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. This material has poor rigidity and is easy to deform. The anti-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 is very likely to cause leakage accidents. After leakage, only some simple repairs can be done, and to completely solve the problem, it must rely on imports. Summary of the Utility Model

[0003] Aiming at the defects existing in the prior art, the purpose of the utility model is to provide a rotary joint for a paddle dryer, which solves the problems of fast wear, poor sealing, easy air leakage, poor condensate drainage and poor heat exchange effect of the existing rotary joint.

[0004] To achieve the above purpose, the utility model adopts the following technical scheme:

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

[0006] A compensation mechanism is arranged on the rotor, and the compensation mechanism contacts the back surface of the sealing ring to push the sealing ring;

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

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

[0009] Preferably, the compensation mechanism includes a base, a spring and a stop block;

[0010] Both the base and the stop block are sleeved on the outer side surface of the rotor;

[0011] A plurality of the springs are provided and are all arranged outside the rotor and uniformly arranged around the horizontal axis of the rotor;

[0012] One end of each of the springs contacts the base, and the other end of each of the springs contacts the stopper;

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

[0014] Preferably, there are 8 springs, each having a wire diameter of 3 mm and a mean diameter of 16 mm.

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

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

[0017] A rotary joint for a paddle dryer provided by the present utility model optimizes the internal sealing structure of the rotary joint of the dryer without changing the structure of the main equipment in the prior art, and is modified in the simplest construction manner and at the lowest cost to improve the leakage and heat exchange problems caused by deformation and damage of the sealing ring. The seal of the rotary joint of the present utility model is not easily deformed and the sealing performance is reliable; the sealing structure has a greater pressure resistance, providing guarantee for high temperature and high pressure required for online speed increase. It ensures that the steam entering the outer pipe of the rotary joint does not leak, and the condensed water in the inner pipe can be discharged smoothly. At the same time, it can effectively improve the production operation stability and safety of the paddle dryer in the sludge treatment industry, and the operation and maintenance cost is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

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

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

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

[0024] Figure 7 is a schematic diagram of the working principle of the rotary joint of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] In order to better understand the above technical solution of the present utility model, the technical solution of the present utility model will be further described below in conjunction with the drawings and embodiments.

[0026] Combined with Figures 4 to 6 As shown, a rotary joint for a paddle dryer provided by the present utility model includes a rotor 10, and a sealing ring 11 and an end cover 12 are sequentially sleeved on the outer side surface of the rotor 10.

[0027] A compensation mechanism is provided on the rotor 10, and the compensation mechanism contacts the back surface of the sealing ring 11 to push the sealing ring 11.

[0028] The front surface of the sealing ring 11 is set as an outward convex spherical surface (positive spherical surface).

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

[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 the sealing surface.

[0031] The sealing ring 11 is formed by pressing and grinding graphite. This material has poor rigidity and is easy to deform. However, due to the positive spherical surface structure of the sealing ring 11, these defects of poor rigidity and easy deformation are compensated, thereby extending the service life of the sealing surface.

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

[0033] Both the base 13 and the stop block 15 are sleeved on the outer side surface of the rotor 10.

[0034] A plurality of springs 14 are provided, all located outside the rotor 10 and evenly arranged around the horizontal axis of the rotor. The stop block 15 is pushed by the combination of the plurality of springs 14 to compensate the sealing ring 11. For the compensation mechanism with multiple springs 14, the loading force on the sealing surface is uniform, and the compensation sealing performance is more superior.

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

[0036] The stop block 15 contacts the back surface of the sealing ring 11.

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

[0038] A stator 16 is also sleeved on the outer side surface of the rotor 10 to enclose the compensation mechanism.

[0039] Combined with Figure 7As shown in the figure, the working principle of the rotary joint of the present utility model is as follows:

[0040] Saturated steam flows into the outer pipe 18 through the steam inlet 17 and then diffuses into the container. As the saturated steam continuously flows in, the pressure in the container gradually increases, and the saturated steam liquefies into condensate. When the condensate level rises to a certain level, the condensate flows out through the inner pipe 19.

[0041] The rotary joint of the present utility model is one of the key components of the paddle dryer. One rotary joint of the present utility model is configured for each hollow rotary paddle main shaft. When the paddle shaft of the dryer rotates to stir and push the sludge, the rotary joint of the present utility model is in a static state. Steam (0.9 Mpa, 180 °C) is introduced into the middle of the paddle main shaft and the paddle through the rotary joint of the present utility model, and heat energy is transferred to the sludge in an indirect heating manner. The steam in the hollow rotary paddle main shaft gradually becomes condensate after releasing latent heat along with the drying heat transfer and heat loss. The condensate passes through the rotary joint of the present utility model from the shaft, and is discharged by using the siphon principle, so that a relatively stable temperature condition can be maintained during the process of the paddle of the dryer stirring and pushing the wet sludge for continuous and uniform heat exchange. If leakage occurs, it will cause poor drainage of the condensate, directly leading to a decrease in the heat exchange efficiency of the paddle shaft, resulting in sludge sticking to the main shaft of the dryer and affecting the operation of the dryer.

[0042] In summary, the present utility model changes the direction of the sealing surface, changes the end cover 12 with good rigidity and wear resistance into an anti-spherical surface, and changes the sealing ring 11 into a positive spherical surface to overcome the defects of poor rigidity and easy deformation of the graphite material; changes the compensation structure of the spring 14. The spring 14 is a plurality of small springs, and the multi-spring compensation applies a uniform loading force to the sealing surface, and the sealing graphite is more wear-resistant. It overcomes the defect of uneven loading force of the single large spring compensating the sealing surface. Therefore, the anti-spherical surface design is adopted, and the anti-spherical surface seal has a greater pressure resistance, providing guarantee for high temperature and high pressure required for online speed increase. After all the sealing surfaces are heat-treated and ground for assembly, the sealing stability is better. The multi-spring compensation applies a uniform loading force to the sealing surface, and the sealing graphite is more wear-resistant.

[0043] Those of ordinary skill in the art in this technical field should recognize that the above embodiments are only used to illustrate the present utility model, rather than to limit the present utility model. As long as it is within the scope of the spirit of the present utility model, any changes and modifications to the above embodiments will fall within the scope of the claims of the present utility model.

Claims

1. A rotary joint for a paddle dryer, characterized in that: It includes a rotor, on the outer side surface of which a sealing ring and an end cover are sequentially sleeved; A compensation mechanism is provided on the rotor, and the compensation mechanism contacts the back surface of the sealing ring to push the sealing ring; The front surface of the sealing ring is set as an outward convex spherical surface; The back surface of the end cover is set as an inward 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 stop block; Both the base and the stop block are sleeved on the outer side surface of the rotor; A plurality of springs are provided on the outer side of the rotor and are evenly arranged around the horizontal axis of the rotor; One end of each spring contacts the base, and the other end of each spring contacts the stop block; The stop block contacts the back surface of the sealing ring.

3. The rotary joint for a paddle dryer according to claim 2, characterized in that: There are 8 springs, the wire diameter of each is 3mm, and the mean diameter of each is 16mm.

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

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

Images