Rotary furnace sealing system

Abstract

The rotary furnace sealing system comprises a fixed sealing unit arranged on a fixed part, the fixed sealing unit comprises an outer sealing sleeve arranged on the inner wall of the fixed part in a surrounding mode and an annular liquid pipe arranged on the inner wall of the outer sealing sleeve in a surrounding mode, and a plurality of liquid outlets are formed in the liquid pipe; the rotating sealing unit is arranged on the rotating part and comprises a heat-resisting sealing sleeve arranged on the outer wall of the rotating part in a surrounding manner and a heat-resisting sealing sleeve arranged on the outer wall of the heat-resisting sealing sleeve in a surrounding manner; and a water absorption sponge is arranged between the heat-resistant sealing sleeve and the annular liquid pipe. According to the rotary furnace sealing system, the water absorption sponge with the water absorption and water retention functions is arranged, so that the sealing liquid can be kept on the water absorption sponge, the sealing liquid and the water absorption sponge form a sealing liquid layer, and the internal environment and the external environment of the rotary furnace can be effectively isolated; therefore, the problem that when an existing rotary furnace is sealed through non-contact liquid sealing, a liquid layer is difficult to form for sealing is solved.

Description

Technical Field

[0001] The present application relates to the technical field of sealing systems, and in particular, to a rotary furnace sealing system. Background Art

[0002] A rotary furnace is a heat treatment device widely used in industrial production such as cement, metallurgy, petrochemical industry, activated carbon activation or cracking, etc. Its main structure is a long cylindrical furnace body, and the furnace body is installed on a rolling support frame, so that the furnace body can rotate around its axis. During operation, during the heating process by a heat source, the material continuously rotates in the furnace tube, thereby realizing operations such as heating, drying, cracking, activation, etc.

[0003] The main function of the rotary furnace seal is to prevent the leakage of gases inside the furnace and the entry of external air, so as to maintain the stability of the atmosphere inside the furnace and the uniform distribution of temperature.

[0004] In the prior art, there are various types of structures for rotary furnace seal devices, mainly including contact seals and non-contact seals. The sealing element of the contact seal is in direct contact with the furnace body or the furnace tube, and realizes sealing through frictional force or extrusion force, such as a fish scale type sealing device, a cylinder pressing type seal, etc. The sealing element of the non-contact seal maintains a certain gap with the furnace body or the kiln body, and realizes sealing through gas pressure difference or labyrinth effect, such as a labyrinth type sealing device. Since the temperature of the rotary furnace is relatively high, the contact seal has a large loss of sealing material.

[0005] The patent publication document CN 116026139 A discloses a rotary kiln head and tail rotating seal device, which belongs to a type of non-contact seal. There is an annular gap between the cylinder body and the connecting pipe of this device, and a liquid sealing mechanism is installed between the cylinder body and the connecting pipe; an oil liquid circulation mechanism is provided on one side of the liquid sealing mechanism; the liquid sealing mechanism includes liquid oil, a fixed part and a rotating part, and a liquid oil film is formed between the fixed part and the rotating part, and the liquid oil film seals the annular gap.

[0006] Although the liquid sealing method disclosed in CN 116026139 A is common in the sealing of precision bearings, however, due to the large volume of the rotary kiln, and since the industries using rotary kilns do not require precise cooperation of each component of the rotary kiln, the gap between the fixed part and the rotating part is relatively large. Therefore, it is difficult to form a liquid film between the fixed part and the rotating part, and it is difficult to achieve reliable sealing. Summary of the Invention

[0007] The technical problem to be solved by the present invention is that when the existing rotary furnace uses non-contact liquid sealing for sealing, it is very difficult to form a liquid film for sealing.

[0008] To solve the above problems, the present invention provides a rotary furnace sealing system, which is installed between the rotating part and the fixed part of the rotary furnace, and is characterized in that it includes: A fixed sealing unit disposed on the fixed part, the fixed sealing unit includes: an outer sealing sleeve disposed around the inner wall of the fixed part, an annular liquid pipe disposed around the inner wall of the outer sealing sleeve, and a plurality of liquid outlets are provided on the liquid pipe; A rotating sealing unit disposed on the rotating part, the rotating sealing unit includes: a heat-resistant sealing sleeve disposed around the outer wall of the rotating part; A water-absorbing sponge is provided between the heat-resistant sealing sleeve and the annular liquid pipe; An inlet is provided at the bottom of the annular liquid pipe.

[0009] The rotary kiln sealing system provided by the present application, through the setting of the water-absorbing sponge with the functions of water absorption and water retention, enables the sealing liquid to be retained on the water-absorbing sponge, so that the sealing liquid and the water-absorbing sponge form a sealing liquid layer, which can effectively isolate the internal and external environments of the rotary kiln, thus solving the problem that it is difficult to form a liquid layer for sealing when the existing rotary kiln uses non-contact liquid sealing for sealing.

[0010] As an option for the installation method of the water-absorbing sponge in the present application, the water-absorbing sponge is installed in the fixed sealing unit, or the water-absorbing sponge is installed in the rotating sealing unit.

[0011] Preferably, the water-absorbing sponge is installed in the rotating sealing unit, so that the water-absorbing sponge can rotate with the rotating sealing unit.

[0012] As an option for the annular liquid pipe in the present application, the inlet is connected to the liquid storage tank through a pipeline.

[0013] As an option for the annular liquid pipe in the present application, the liquid outlet is located in the upper region of the annular liquid pipe, and the liquid outlet is provided in the upper region, so that the sealing liquid continuously adds water to the rotating water-absorbing sponge from the upper part, and the water-absorbing sponge forms a water layer.

[0014] As an option for the liquid storage tank in the present application, the liquid storage tank is disposed on the top of the fixed part.

[0015] In order to improve the sealing effect of the sealing system, as an option for the rotary kiln sealing system in the present application, the cross-section of the xoz plane of the area where the annular liquid pipe is connected to the heat-resistant sealing sleeve is a mutually nested concave-convex surface.

[0016] Optionally, the concave-convex surface of the annular liquid pipe includes a vertical surface and a circumferential surface between two vertical surfaces, and a plurality of liquid outlets are provided on at least one of the vertical surface and the circumferential surface.

[0017] In order to achieve automatic liquid discharge of the sealing liquid, as an option for the rotary kiln sealing system in the present application, a ball is installed at the liquid outlet through an elastic member, the diameter of the ball is smaller than the diameter of the liquid outlet, and most of the ball is located inside the annular liquid pipe.

[0018] Optionally, the balls on the liquid outlets whose two adjacent vertical surfaces are projected onto the same yoz surface are mounted on the annular liquid pipe via the same spring.

[0019] Preferably, the rotary sealing unit further comprises a plurality of mounting plates for fixing the water-absorbing sponge, the plurality of mounting plates are connected to the heat-resistant sealing sleeve, and the plurality of mounting plates are arranged at intervals.

[0020] Through the spacing setting of the mounting plates, when the mounting plate fixing the water-absorbing sponge rotates to the ball bearing area, the mounting plate will press the ball bearing to increase the liquid output from the liquid outlet in the ball bearing area; when the water-absorbing sponge area rotates to the ball bearing area, the liquid output in the ball bearing area is small due to the greater elasticity of the water-absorbing sponge area.

[0021] Optionally, the spring is mounted on the annular liquid pipe via a spring mounting member.

[0022] Optionally, the spring mounting member includes a mounting body and a spring mounting tube that passes through the mounting body.

[0023] The technical effects of this application are: The absorbent sponge is composed of a large number of tiny pores, which are similar to capillaries. When the sponge comes into contact with water, the water will soak the sponge, making the liquid surface in the pore concave. The concave liquid surface will produce an upward pulling force on the liquid below, which is called capillary force. This pulling force causes the liquid to rise along the wall of the pore until the upward pulling force is balanced with the gravity of the liquid column in the tube, and the liquid stops rising, forming a capillary phenomenon. It is this capillary action that allows water to be quickly absorbed into the pores of the sponge foam. Due to the interaction force between the molecules of the liquid in the sponge, this force makes the molecules on the surface of the liquid close together, forming a sealed "liquid layer" with a certain strength. The absorbent sponge is set between the heat-resistant sealing sleeve and the annular liquid tube. The absorbent sponge has excellent water absorption and water retention capabilities. When the annular liquid tube releases the sealing liquid through the liquid outlet, the absorbent sponge can quickly absorb and evenly distribute the sealing liquid to form a stable liquid layer, thereby achieving effective sealing.

[0024] The design of the ball and the elastic component realizes the self-controlled liquid discharge of the sealing liquid. That is, only when the pressure of the sealing liquid reaches a certain level or when the ball rolls, the sealing liquid will flow out, improving the stability and reliability of the sealing system. In the static or low-pressure state, the ball can block the liquid outlet, effectively reducing the leakage risk of the sealing liquid. When the rotary furnace operates, the water-absorbing sponge rubs against the ball, pushing the ball to overcome the pressure of the elastic component or causing the ball to rotate on its own, so that the sealing liquid flows out from the liquid outlet. After the water-absorbing sponge absorbs the sealing liquid, a sealing liquid layer is formed. The balls on the liquid outlets where two adjacent vertical surfaces are projected onto the same yoz plane are installed on the annular liquid pipe by being abutted by the same spring. The spring applies a certain pressure to the ball, making the ball keep in close contact at the liquid outlet to prevent the sealing liquid from flowing out uncontrollably. By sharing the spring, the number of springs is reduced, simplifying the internal structure of the annular liquid pipe.

[0025] The rotary furnace sealing system provided by this application can isolate the gases inside and outside the furnace body, ensuring an oxygen-free environment inside the furnace, enabling the rotary furnace to be used for the reduction of oxides or sulfates of gold, silver, copper, iron, zinc, and aluminum. By adding carbon and performing anaerobic reduction in the rotary furnace, the reduced pure metal can be obtained. Brief Description of the Drawings

[0026] Figure 1 is a schematic diagram of the installation position of the rotary furnace sealing system provided in the embodiment of this application; Figure 2 is another schematic diagram of the installation position of the rotary furnace sealing system provided in the embodiment of this application; Figure 3 is an axonometric sectional view of the rotary furnace sealing system provided in the embodiment of this application; Figure 4 is Figure 3 an enlarged schematic diagram at position a; Figure 5 is a schematic diagram of the installation of the heat-resistant sealing sleeve and the water-absorbing sponge in the rotary furnace sealing system provided in the embodiment of this application; Description of the Reference Numerals: 1000, rotary furnace sealing system; 2000, rotating part; 3000, fixed part; 1, fixed sealing unit; 11, outer sealing sleeve; 12, annular liquid pipe; 121, liquid outlet; 122, liquid inlet; 123, vertical surface; 124, circumferential surface; 125, ball; 126, spring; 127, spring mounting member; 1271, mounting body; 1272, spring mounting cylinder; 2, rotating sealing unit; 21, heat-resistant sealing sleeve; 22, mounting plate; 3, water-absorbing sponge; 4, liquid storage tank. Detailed Embodiments

[0027] The embodiments of the technical solution of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solution of the present application more clearly, so they are only examples and cannot be used to limit the protection scope of the present application.

[0028] As Figures 1 to 5 FIG. 1 schematically shows an application scenario of the rotary kiln sealing system provided by the present invention. The rotating part 2000 is the furnace body of the rotary kiln, and the fixed part 3000 is the stationary kiln body. In some embodiments of the rotary kiln sealing system of the present invention, the sealing system 1000 is installed between the rotating part 2000 and the fixed part 3000 of the rotary kiln, and includes: a fixed sealing unit 1 provided on the fixed part 3000, and the fixed sealing unit 1 includes: an outer sealing sleeve 11 surrounding and arranged on the inner wall of the fixed part 3000, an annular liquid pipe 12 surrounding and arranged on the inner wall of the outer sealing sleeve 11, and a plurality of liquid outlets 121 are arranged on the liquid pipe 12; a rotating sealing unit 2 provided on the rotating part 2000, and the rotating sealing unit 2 includes: a heat-resistant sealing sleeve 21 surrounding and arranged on the outer wall of the rotating part 2000, and a water-absorbing sponge 3 is arranged between the heat-resistant sealing sleeve 21 and the annular liquid pipe 12. Optionally, the heat-resistant sealing sleeve 21 can be set as an annular structure with a concave cross-section for wrapping the inner ring surface of the water-absorbing sponge 3.

[0029] Specifically, the fixed sealing unit 1 is provided on the fixed part 3000, and the outer sealing sleeve 11 surrounds and is arranged on the inner wall of the fixed part 3000, playing a role of support and positioning. The material of the outer sealing sleeve 11 can be selected as high-temperature-resistant refractory bricks, heat-resistant metals, etc. For example, a box made of silicon steel plates can be filled with rock wool, refractory bricks, refractory ceramics, etc. The annular liquid pipe 12 surrounds and is arranged on the inner wall of the outer sealing sleeve 11. The annular liquid pipe 12 is filled with a sealing liquid, which can be replenished through an external liquid supply system. A plurality of liquid outlets 121 are arranged on the liquid pipe 12, and these liquid outlets are evenly distributed on the inner peripheral wall of the liquid pipe 12 for evenly releasing the sealing liquid into the gap between the heat-resistant sealing sleeve 21 and the annular liquid pipe 12.

[0030] The rotating sealing unit 2 is provided on the rotating part 2000, and the heat-resistant sealing sleeve 21 surrounds and is arranged on the outer wall of the rotating part 2000, which can resist the high-temperature environment generated during the operation of the rotary kiln. The material of the heat-resistant sealing sleeve 21 can be selected as high-temperature-resistant ceramic materials, metal materials, composite materials, refractory bricks, etc. For example, a box made of silicon steel plates can be filled with rock wool, refractory bricks, refractory ceramics, etc. The heat-resistant sealing sleeve 21 and the annular liquid pipe 12 cooperate with each other to form a sealed space.

[0031] The water-absorbing sponge 3 is arranged between the heat-resistant sealing sleeve 21 and the annular liquid pipe 12. The water-absorbing sponge 3 has the ability to absorb and retain water. When the annular liquid pipe 12 releases the sealing liquid through the liquid outlet 121, the water-absorbing sponge 3 can quickly absorb and evenly distribute the sealing liquid to form a stable liquid layer, thereby achieving effective sealing. The sealing liquid in the annular liquid pipe 12 is preferably water. Since the annular liquid pipe 12 is filled with water, it also has a cooling effect to a certain extent.

[0032] In this embodiment, the water-absorbing sponge 3 is composed of a large number of tiny pores, which are similar to capillaries. When the sponge comes into contact with water, the water will infiltrate the sponge, causing the liquid level in the pores to be concave. The concave liquid level will generate an upward pulling force on the liquid below. This pulling force causes the liquid to rise along the wall of the pores until the upward pulling force balances the gravity of the liquid column in the pipe, and the liquid stops rising, forming the capillary phenomenon. It is precisely this capillary action that enables water to be quickly absorbed into the pores of the sponge foam. Due to the intermolecular forces among the liquid molecules in the sponge, this force causes the molecules at the liquid surface to come closer together, forming a "liquid layer" with a certain strength, that is, the surface tension of the liquid. For the sponge foam, this surface tension helps water molecules form a stable liquid layer on its surface and promotes water molecules to enter the pores. The pore structure of the sponge foam is complex and dense, capable of accommodating a large amount of water. These pores are interconnected to form a huge water storage network, enabling the sponge to retain water for a long time. As mentioned above, the surface tension of the liquid causes water molecules to form a stable liquid layer on the surface of the sponge foam. When the sponge is fully saturated with water, the water film on its surface will become denser and more uniform, forming a continuous water layer. The pores of the sponge foam will form tiny capillaries after absorbing water. The water molecules in these capillaries are affected by the surface tension to form a closed water film. This closing effect makes the water film more stable and less likely to flow out. In an alternative embodiment, the material of the water-absorbing sponge 3 can be hydrophilic polyurethane foam, sponge, or other suitable water-absorbing materials. These materials usually contain hydrophilic groups that can form hydrogen bonds with water molecules, thereby enhancing the water retention capacity of the sponge. Preferably, it is selected as the polyurethane water-absorbing sponge sold on the market.

[0033] During the operation of the rotary furnace, the annular liquid pipe 12 of the fixed sealing unit 1 continuously releases the sealing liquid through the liquid outlet 121. After the water-absorbing sponge 3 absorbs the sealing liquid, a stable sealing liquid layer is formed in the water-absorbing sponge 3, and the liquid layer achieves an effective barrier between the inside and outside of the rotary furnace, thereby achieving an effective sealing effect.

[0034] The rotary kiln sealing system provided in this embodiment, through the setting of the water-absorbing sponge with the functions of water absorption and water retention, enables the sealing liquid to be retained on the water-absorbing sponge, so that the sealing liquid and the water-absorbing sponge form a sealing liquid layer, which can effectively isolate the internal and external environments of the rotary kiln, thus solving the problem that it is difficult to form a liquid layer for sealing when the existing rotary kiln uses non-contact liquid sealing for sealing.

[0035] In some optional embodiments, the water-absorbing sponge 3 is installed on the fixed sealing unit 1, or the water-absorbing sponge 3 is installed on the rotating sealing unit 2. Based on the foregoing embodiments, this embodiment provides optional solutions for the installation position of the water-absorbing sponge 3.

[0036] This embodiment provides two optional installation positions for the water-absorbing sponge 3: One is that the water-absorbing sponge 3 is installed on the fixed sealing unit 1. In this case, the water-absorbing sponge 3 is fixedly installed on the inner wall of the annular liquid pipe 12. When the annular liquid pipe 12 releases the sealing liquid through the liquid outlet 121, the water-absorbing sponge 3 directly absorbs and stores the sealing liquid to form a liquid layer. The water-absorbing sponge 3 is in close contact with the annular liquid pipe 12, and can absorb and distribute the sealing liquid faster.

[0037] The other is that the water-absorbing sponge 3 is installed on the rotating sealing unit 2. In this case, the water-absorbing sponge 3 is fixedly installed on the outer wall of the heat-resistant sealing sleeve 21 and rotates with the rotation of the rotating part 2000. When the annular liquid pipe 12 releases the sealing liquid, the sealing liquid will penetrate into the water-absorbing sponge 3 to form a liquid layer. The water-absorbing sponge 3 rotates with the rotating part 2000, and can maintain a dynamic seal with the annular liquid pipe 12.

[0038] Regardless of the installation position of the water-absorbing sponge 3, its working principle is similar, that is, the water-absorbing sponge 3 absorbs the sealing liquid released by the annular liquid pipe 12 to form a stable liquid layer, so as to realize the effective seal between the rotating part 2000 and the fixed part 3000.

[0039] It should be noted that the following embodiments are based on the embodiment in which the water-absorbing sponge 3 is installed on the rotating sealing unit 2.

[0040] Continue to refer to Figure 1 、 Figure 3, in one embodiment, a liquid inlet 122 is provided at the bottom of the annular liquid pipe 12, and the liquid inlet 122 is connected to the liquid storage tank 4 through a pipe. On the basis of the foregoing embodiment, this embodiment further provides a liquid supply method for the annular liquid pipe 12, that is, the continuous supply of the sealing liquid is realized by providing the liquid inlet 122 and connecting it to the liquid storage tank 4. The liquid inlet 122 on the annular liquid pipe 12 is located at the bottom of the annular liquid pipe 12 and is connected to the liquid storage tank 4 through a pipe, and is used to supplement the sealing liquid from the liquid storage tank 4 into the annular liquid pipe 12. The liquid storage tank 4 is a container for storing the sealing liquid, and its interior is filled with sufficient sealing liquid for the continuous use of the annular liquid pipe 12. The liquid storage tank 4 can transport the sealing liquid to the liquid inlet 122 of the annular liquid pipe 12 through a pump or other liquid conveying devices (not shown in the figure). By providing the liquid inlet 122 and connecting it to the liquid storage tank 4, the continuous supply of the sealing liquid is realized, ensuring the stable operation of the sealing system. Preferably, a liquid level gauge (not shown in the figure) is also provided in the annular liquid pipe 12 to ensure that there is sufficient sealing liquid in the annular liquid pipe 12. It should be noted that those skilled in the art know that the flow rate of the sealing liquid introduced into the liquid inlet 122 is generally not less than the sum of the flow rates of the sealing liquid flowing out of all the liquid outlets 121.

[0041] Continue to refer to Figure 1 , in one embodiment, the liquid outlet 121 is located in the upper region of the annular liquid pipe 12. The liquid outlet 121 is provided in the upper region of the annular liquid pipe 12, so that the sealing liquid flows out from the upper part of the annular liquid pipe 12. When the sealing liquid flows out from the liquid outlet 121, due to the action of gravity, the sealing liquid will naturally flow downward. Setting the liquid outlet in the upper region can ensure that the sealing liquid can evenly cover the area below the annular liquid pipe 12 to form a continuous sealing layer. Since the water-absorbing sponge 3 rotates with the rotating part 2000, during the rotation of the water-absorbing sponge 3, the sealing liquid flowing out from the liquid outlet 121 above the annular liquid pipe 12 will also completely soak the water-absorbing sponge 3, and the water-absorbing sponge 3 quickly absorbs the sealing liquid and forms a sealing liquid layer. Preferably, a sealing liquid collection port (not shown in the figure) can also be provided at the bottom of the outer sealing sleeve 11 to realize the collection of the sealing liquid.

[0042] Continue to refer to Figure 1 , in one embodiment, the liquid storage tank 4 is provided on the top of the fixed part 3000. On the basis of the foregoing embodiment, this embodiment specifically describes the installation position of the liquid storage tank 4, that is, the liquid storage tank 4 is installed on the top of the fixed part 3000. The choice of installing the liquid storage tank 4 on the top of the fixed part 3000 helps to utilize the action of gravity to make the sealing liquid flow more smoothly into the liquid inlet 122 of the annular liquid pipe 12. When the sealing liquid in the annular liquid pipe 12 decreases to a certain extent, the sealing liquid is supplemented from the liquid storage tank 4 located on the top of the fixed part 3000 through the liquid inlet 122. Since the liquid storage tank 4 is located at the top, the sealing liquid can flow smoothly into the annular liquid pipe 12.

[0043] Refer toFigures 3 to 4 , in some embodiments, the cross-section of the xoz plane of the region where the annular liquid pipe 12 is connected to the heat-resistant sealing sleeve 21 is a mutually nested concave-convex surface. On the xoz plane (i.e., the longitudinal section passing through the axis of the rotary furnace), the cross-section of the region where the annular liquid pipe 12 is connected to the heat-resistant sealing sleeve 21 is a mutually nested concave-convex surface. For example, in one embodiment, the convex surface is usually located on the inner wall of the annular liquid pipe 12, facing the heat-resistant sealing sleeve 21, and the concave surface is correspondingly located on the outer wall of the heat-resistant sealing sleeve 21, mating with the convex surface of the annular liquid pipe 12. At this time, optionally, the annular liquid pipe 12 can be a single annular liquid pipe or multiple annular liquid pipes divided according to the concave-convex surface.

[0044] The concave-convex structure can increase the contact area of the sealing surface, thereby improving the tightness of the seal. Through the mutually cooperating concave-convex structure, it is possible to more effectively prevent the leakage of liquid or gas. The concave-convex structure can also form a labyrinth-like sealing path, making it difficult for the sealed medium to pass through, further enhancing the sealing effect and enhancing the impact resistance of the water-absorbing sponge, especially during the operation of the rotary furnace due to the gap change caused by the relative movement between the rotating part and the fixed part. The design of the mutually nested concave-convex surfaces helps to maintain the relative position stability between the annular liquid pipe 12 and the heat-resistant sealing sleeve 21.

[0045] Correspondingly, the water-absorbing sponge 3 is arranged in a concave-convex shape between the heat-resistant sealing sleeve 21 and the annular liquid pipe 12. After the water-absorbing sponge 3 absorbs the sealing liquid, it evenly distributes it in the gap between the concave surface of the heat-resistant sealing sleeve 21 and the convex surface of the annular liquid pipe 12, forming a stable liquid layer. In the concave-convex gap formed between the heat-resistant sealing sleeve 21 and the annular liquid pipe 12, multiple water-absorbing sponges 3 can be arranged, or a single water-absorbing sponge 3 can be arranged. The design of the mutually nested concave-convex surfaces ensures the continuity and uniformity of the liquid layer, thereby achieving an effective seal.

[0046] Continue to refer to Figures 3 to 4, in some embodiments, the concave-convex surface of the annular liquid pipe 12 includes a vertical surface 123 and a circumferential surface 124 between two vertical surfaces 123. A plurality of liquid outlets 121 are provided on at least one of the vertical surface 123 and the circumferential surface 124. The concave-convex surface of the annular liquid pipe 12 includes two opposite vertical surfaces 123. These vertical surfaces form a nested fit with corresponding parts of the heat-resistant sealing sleeve 21 in the xoz plane (i.e., the longitudinal section perpendicular to the axis of the rotary kiln). The circumferential surface 124 is located between the two vertical surfaces 123 and connects the two vertical surfaces 123 to form a complete concave-convex surface structure. The liquid outlets 121 are provided on at least one of the vertical surface 123 and the circumferential surface 124. By providing the liquid outlets 121 on the vertical surface 123, it can ensure that the sealing liquid flows out along the vertical surface and covers the corresponding area of the heat-resistant sealing sleeve 21. By providing the liquid outlets 121 on the circumferential surface 124, it helps the sealing liquid to be distributed laterally and enhances the continuity of the seal. By providing the liquid outlets 121 on the vertical surface 123 and the circumferential surface 124 of the concave-convex surface, it can ensure that the sealing liquid is more evenly absorbed by the water-absorbing sponge located between the annular liquid pipe 12 and the heat-resistant sealing sleeve 21, forming a more stable liquid layer. According to the operating conditions and sealing requirements of the rotary kiln, the position and quantity of the liquid outlets 121 can be flexibly adjusted to adapt to different working conditions. When the rotary kiln is operating, the annular liquid pipe 12 releases the sealing liquid through the liquid outlets 121 provided on the vertical surface 123 and the circumferential surface 124. After the water-absorbing sponge 3 absorbs the sealing liquid, a layer of sealing liquid layer is formed.

[0047] Continue to refer to Figures 3 to 4 , in some embodiments, the ball 125 is installed at the liquid outlet 121 through an elastic member. The elastic member can be a spring, a metal elastic sheet connected inside the annular liquid pipe 12 (not shown in the figure), etc. The diameter of the ball 125 is smaller than the diameter of the liquid outlet 121, so that the ball 125 can freely rotate within the liquid outlet 121, but is constrained by the elastic member to keep part of it inside the annular liquid pipe 12. Most of the ball 125 is located inside the annular liquid pipe 12 to ensure that when in a static or low-pressure state, the ball 125 can block the liquid outlet 121 and prevent the sealing liquid from flowing out uncontrollably. When the rotating part rotates, the ball 125 will also rotate with the rotating part. During the rotation of the ball 125, water will also flow out from the liquid outlet 121 (similar to the ink outlet of a ballpoint pen).

[0048] The design of the ball 125 and the elastic member realizes the automatic liquid discharge of the sealing liquid. That is, only when the pressure of the sealing liquid reaches a certain level or the ball rolls, the sealing liquid will flow out, improving the stability and reliability of the sealing system. In the static or low-pressure state, the ball 125 can block the liquid outlet 121, effectively reducing the leakage risk of the sealing liquid. When the rotary kiln operates, the water-absorbing sponge rubs against the ball 125, pushing the ball 125 to overcome the pressure of the elastic member or causing the ball 125 to rotate self, so that the sealing liquid flows out from the liquid outlet 121. After the water-absorbing sponge 3 absorbs the sealing liquid, a sealing liquid layer is formed.

[0049] Continue to refer to Figures 3 to 4 , in some embodiments, within the annular liquid pipe 12, the balls 125 on the liquid outlets 121 where the projections of two adjacent vertical surfaces 123 on the same yoz plane are located are mounted on the annular liquid pipe 12 by being abutted and installed through the same spring 126. In this embodiment, the balls 125 on the liquid outlets 121 where the projections of two adjacent vertical surfaces 123 on the same yoz plane are located are mounted on the annular liquid pipe 12 by being abutted and installed through the same spring 126. The spring 126 exerts a certain pressure on the balls 125, making the balls 125 keep in close contact at the liquid outlet 121, preventing the uncontrolled outflow of the sealing liquid. By sharing the spring 126, the number of springs is reduced, and the internal structure of the annular liquid pipe 12 is simplified. The design of sharing the spring 126 makes the installation of the balls 125 more convenient and fast, improving the production efficiency. The spring 126 exerts a stable pressure on the balls 125, ensuring the close contact of the balls 125 at the liquid outlet 121 and improving the reliability of the sealing system.

[0050] Continue to refer to Figures 4 to 5 , in some embodiments, the rotating seal unit 2 further includes a plurality of mounting plates 22 for fixing the water-absorbing sponge 3. The plurality of mounting plates 22 are connected to the heat-resistant seal sleeve 21 and are arranged at intervals.

[0051] The mounting plate 22 is mainly used to fix the water-absorbing sponge 3 to ensure that the water-absorbing sponge 3 can be stably installed in the rotating seal unit 2. The spaced arrangement of the mounting plates 22 enables the water-absorbing sponge 3 to have different interactions with the balls during rotation. When the mounting plate 22 fixing the water-absorbing sponge rotates to the ball area, the solid part of the mounting plate 22 will press the ball, and the pressing effect will change the liquid discharge amount of the liquid outlet in the ball area, increasing the liquid discharge amount. When the area of the water-absorbing sponge 3 rotates to the ball area, due to the large elasticity of the water-absorbing sponge, it will not produce an obvious pressing effect on the ball like the mounting plate. Therefore, the liquid discharge amount of the liquid outlet 121 in the ball area will be relatively small. Through the spaced arrangement of the mounting plates 22 and the water-absorbing sponge 3 and their interactions with the ball area, the dynamic adjustment of the liquid discharge amount is realized. For example, when the rotating part 2000 (such as the rotary kiln body) stops rotating, the water-absorbing sponge 3 is controlled to directly contact the ball area to reduce the liquid discharge amount of the liquid outlet 121.

[0052] Referring to Figures 3 to 4 , in some embodiments, the spring 126 is mounted on the annular liquid pipe 12 through a spring mounting member 127. The spring mounting member 127 is fixed inside the annular liquid pipe 12 (depending on the specific design), providing a mounting fulcrum for the spring 126. The spring mounting member 127 is provided with mounting holes or mounting grooves matching the spring 126, enabling the spring 126 to be stably mounted on the spring mounting member 127. Through the spring mounting member 127, the position of the spring 126 can be conveniently adjusted to adapt to the layout of different liquid outlets 121.

[0053] Continuing to refer to Figures 3 to 4 , in some embodiments, the spring mounting member 127 includes a mounting body 1271 and a spring mounting cylinder 1272 penetrating through the mounting body 1271.

[0054] The mounting body 1271 is a planar structure or a structure adapted to the internal shape of the annular liquid pipe 12. The spring mounting cylinder 1272 penetrates through the mounting body 1271 and is used to mount the spring 126. The inner diameter of the spring mounting cylinder 1272 matches the outer diameter of the spring 126, enabling the spring 126 to be stably mounted inside the spring mounting cylinder 1272. The length of the spring mounting cylinder 1272 can be designed according to the compression amount of the spring 126 and the mounting requirements. The opening direction of the spring mounting cylinder 1272 can be consistent with the direction of the liquid outlet 121, so that the spring 126 can exert a positive pressure on the ball 125.

[0055] Finally, it should be noted that: in the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "arranged", "provided with", "mounted", "connected", "linked", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated, and can also be a mechanical connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0056] In the description of the embodiments of the present application, the orientation or positional relationship indicated by technical terms such as "upper", "lower", "inner", "outer", "circumferential", and planar relationship is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the embodiments of the present application.

[0057] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. The sealing system according to claim 1, characterized in that The water-absorbing sponge (3) is installed on the fixed sealing unit (1), or the water-absorbing sponge (3) is installed on the rotating sealing unit (2).

2. The sealing system according to claim 1, characterized in that The liquid outlet (121) is located in the upper region of the annular liquid pipe (12).

3. The sealing system according to claim 1, characterized in that The cross section of the xoz surface of the area where the annular liquid pipe (12) and the heat-resistant sealing sleeve (21) meet is a concave-convex surface that is nested with each other.

4. The sealing system according to claim 4, characterized in that The concave-convex surface located on the annular liquid pipe (12) comprises a vertical surface (123) and a circumferential surface (124) between the two vertical surfaces (123), and a plurality of liquid outlets (121) are provided on at least one of the vertical surface (123) and the circumferential surface (124).

5. The sealing system according to claim 1, characterized in that A ball (125) is installed at the liquid outlet (121) via an elastic member, the diameter of the ball (125) is smaller than the diameter of the liquid outlet (121), and most of the ball (125) is located in the annular liquid pipe (12).

6. The sealing system according to claim 6, characterized in that In the annular liquid pipe (12), two adjacent vertical surfaces (123) are projected onto the liquid outlet (121) on the same yoz plane, and the balls (125) are mounted on the annular liquid pipe (12) via the same spring (126).

7. The sealing system according to any one of claims 6 to 7, characterized in that: The rotary sealing unit (2) further comprises a plurality of mounting plates (22) for fixing the water-absorbing sponge (3); the plurality of mounting plates (22) are connected to the heat-resistant sealing sleeve (21), and the plurality of mounting plates (22) are arranged at intervals.

8. The sealing system according to claim 8, characterized in that The spring (126) is mounted on the annular liquid pipe (12) via a spring mounting member (127).

9. The sealing system according to claim 9, characterized in that The spring mounting member (127) comprises a mounting body (1271) and a spring mounting tube (1272) which passes through the mounting body (1271).

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