Dryer cooling structure

Abstract

The utility model relates to the technical field of lecithin drying, and discloses a dryer cooling structure which is used for cooling a mechanical seal structure connected with a stirring shaft on a lecithin dryer, the mechanical seal structure comprises a movable ring piece and a static ring piece which are arranged outside the stirring shaft, the movable ring piece is fixedly connected with the stirring shaft, and the static ring piece is fixedly connected with a tank body. The upper end face of the static ring piece abuts against the lower end of the movable ring piece. A lubricating channel is formed in one side of the movable ring piece and one side of the static ring piece, and a water absorption piece used for stretching into the lubricating channel and making contact with the contact face of the movable ring piece and the static ring piece is arranged on one side of the lubricating channel. One side of the mechanical seal structure is provided with a lubricating opening allowing the water absorption piece to stretch into the lubricating channel, the lubricating opening is provided with a first nozzle used for spraying cooling liquid to the movable ring piece and the static ring piece, and the first nozzle is located above the water absorption piece. According to the utility model, cooling can be realized by using less cooling liquid, and foreign matters are prevented from falling into the tank body due to excessive cooling liquid.

Description

Technical Field

[0001] The utility model relates to the technical field of lecithin drying, in particular to a cooling structure of a dryer. Background Art

[0002] Lecithin is a nutrient extracted from egg yolks and is also widely present in animals and plants. Its main components include phosphatidylcholine (PC), cephalin (PE), inositol phospholipid (PI), and phosphatidic acid (PA). This nutrient-rich substance has a variety of important physiological functions, including delaying aging, improving brain vitality, preventing arteriosclerosis, relieving cardiovascular diseases, preventing fatty liver, and moisturizing the skin.

[0003] In the production process of lecithin, drying is a very important process step. By drying lecithin in a vacuum, the organic solvent acetone and water contained in the product can be effectively removed. Currently, common lecithin dryers basically adopt a vacuum structure. To make the drying more thorough, a stirring device is generally set. The stirring device generally includes a stirring shaft arranged in the tank body and stirring blades connected to the stirring shaft. The stirring shaft is driven to rotate by a bearing connected to a motor. During the rotation of the stirring shaft, lubrication is required to make the rotation smoother. After long-term rotation, heat will be generated at the position where the driving rotation is connected, accelerating the wear between the moving die and the static die of the contact part and easily generating residues. And to better lubricate the various components that drive the rotation of the rotating shaft, the relevant structure is directly sealed by a mechanical seal, and then the coolant is filled in the sealed space for cooling.

[0004] However, as the use time of the lecithin dryer increases, the wear at the contact part between the existing mechanical seal and the stirring shaft will increase, forming a gap for metal residues, lubricating oil, or coolant to fall into the tank body. After these metal residues, lubricating oil, or coolant fall into the tank body, not only the lecithin product to be dried is contaminated, but also there is a high probability of causing an explosion hazard when encountering the flammable and explosive substance acetone in the tank body. Content of the Utility Model

[0005] The purpose of the utility model is to provide a cooling structure of a dryer to solve the problem that too much coolant is likely to fall into the tank body as the use time of the lecithin dryer becomes longer, causing product contamination and even explosion hazards.

[0006] To solve the above problems, the following solutions are made:

[0007] Solution 1: A dryer cooling structure is used to cool the mechanical seal structure connected to the stirring shaft on the lecithin dryer. The mechanical seal structure includes a dynamic ring and a static ring arranged outside the stirring shaft. The dynamic ring is fixedly connected to the stirring shaft, and the static ring is fixedly connected to the tank body. The upper end surface of the static ring abuts against the lower end of the dynamic ring. The dryer cooling structure includes a lubrication channel located on one side of the mechanical seal structure, and the lubrication channel is located on one side of the dynamic ring and the static ring. The lubrication channel communicates with a lubrication port on the wall of the mechanical seal structure. A first nozzle for spraying coolant towards the static ring is arranged on the lubrication port. An absorbent is also arranged on the lubrication port and extends into the lubrication channel to contact the contact surface between the dynamic ring and the static ring. The absorbent is located below the first nozzle and is used to adsorb the coolant sprayed and dropped by the first nozzle. The absorbent extends upward along the lubrication channel to the contact position between the dynamic ring and the static ring, and the contact end of the absorbent with the dynamic ring and the static ring is a flexible end.

[0008] Further, the flexible end is a sponge strip or a cotton cloth strip with water absorption performance.

[0009] Further, the absorbent has the same shape as the direction of the lubrication channel, including a straight section connected to the lubrication port, a first bent section bent upward obliquely, and a second bent section bent towards the contact surface between the dynamic ring and the static ring.

[0010] Further, the mechanical seal structure forms a single-end face mechanical seal with a stabilizer and the upper end surface of the dynamic ring, and a vertical section extending upward and contacting the single-end face mechanical seal is connected to the first bent section.

[0011] Further, the flexible end is located at the free end of the second bent section and / or the vertical section.

[0012] Further, a plastic strip for maintaining the bent shape of the absorbent is arranged inside the absorbent, and the plastic strip has elasticity.

[0013] Further, an overflow port is arranged above the lubrication port, and a second nozzle is installed on the overflow port. The second nozzle sprays coolant towards the single-end face mechanical seal; the second nozzle is located above the free end of the vertical section.

[0014] Further, the length of the first bent section is greater than that of the straight section and the first bent section.

[0015] Further, the free end of the second bent section is a fan-shaped structure.

[0016] Further, the included angle between the first bent section and the straight section and the included angle between the first bent section and the second bent section are both greater than 95 degrees and less than 180 degrees.

[0017] The advantages of this solution are:

[0018] The utility model relates to a mechanical seal structure improved for a lecithin dryer, and specifically provides a dryer cooling structure that uses very little coolant. Compared with the current lecithin dryer, which needs to cool down by immersing the entire mechanical seal structure in cold water, the utility model reduces the number of dynamic ring parts and static ring parts by improving the internal structure of the mechanical seal structure. From the original double-end mechanical seal that requires a set of seals at both the upper and lower ends of the mechanical seal structure, it now only requires a single-end mechanical seal that cooperates with the dynamic ring parts and static ring parts. The utility model does not need to immerse the entire mechanical seal structure in cold water, and only needs to locally cool and lubricate the contact surface of the dynamic ring parts and static ring parts through a water-absorbing part and a first nozzle. On the premise of greatly reducing the liquid in the mechanical seal structure, it reduces the possible liquid leakage caused by wear.

[0019] In addition, through the second nozzle and the vertical section on the water-absorbing part, the single-end mechanical seal can be cooled. Whether it is the first nozzle or the second nozzle, the amount of coolant sprayed is much less than the amount of liquid in the existing overall seal, and the sprayed liquid is directly absorbed and stored by the water-absorbing part, without causing liquid flow or even leakage. By contacting the flexible end of the water-absorbing part to coat the coolant on the corresponding cooling surface, while achieving the cooling effect, the usage amount of the coolant is greatly reduced.

[0020] The utility model can effectively reduce the amount of liquid in the mechanical seal structure above the tank filling port without affecting lubrication and cooling, avoiding liquid leakage into the tank; it can reduce the metal residues generated by the mutual movement and wear of the dynamic ring parts and static ring parts. The utility model effectively solves the problem that metal residues, coolant or lubricating oil are likely to fall into the tank as the use time of the lecithin dryer becomes longer, causing product pollution and even explosion hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic structural diagram of Embodiment 1 of the utility model.

[0022] Figure 2 is Figure 1 a partial schematic diagram of A in

[0023] Figure 3 It is a schematic structural diagram of Embodiment 2 of the utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The following is a more detailed description through specific embodiments:

[0025] The reference numerals in the accompanying drawings of the description include: bearing 21, single-end mechanical seal 22, overflow port 23, lubrication port 24, first nozzle 25, second nozzle 26, water-absorbing member 27, dynamic ring member 28, static ring member 29, top plate 30, retaining piece 31, shaft sleeve 32, first channel 33, second channel 34, lateral discharge port 35, vertical discharge port 36, liquid leakage discharge port 37, third channel 38, straight section 41, first bent section 42, second bent section 43, vertical section 44.

[0026] Embodiment 1

[0027] As Figure 1 shown, the dryer cooling structure in this embodiment is used to cool the mechanical seal structure connected to the stirring shaft on the lecithin dryer. The mechanical seal structure includes a dynamic ring member 28 and a static ring member 29 arranged outside the stirring shaft. The dynamic ring member 28 is fixedly connected to the stirring shaft, and the static ring member 29 is fixedly connected to the tank body. The upper end surface of the static ring member 29 abuts against the lower end of the dynamic ring member 28. The dryer cooling structure includes a lubrication channel located on one side of the mechanical seal structure. The lubrication channel is located on one side of the dynamic ring member 28 and the static ring member 29. A lubrication port 24 is communicated with the mechanical seal structure wall in the lubrication channel. A first nozzle 25 for spraying the coolant towards the static ring member 29 is arranged on the lubrication port 24. A water-absorbing member 27 extending into the lubrication channel and contacting the contact surface of the dynamic ring member 28 and the static ring member 29 is also arranged on the lubrication port 24. The water-absorbing member 27 is located below the first nozzle 25 and is used to adsorb the coolant scattered by the first nozzle 25. The water-absorbing member 27 extends upward along the lubrication channel to the contact position of the dynamic ring member 28 and the static ring member 29, and the contact end of the water-absorbing member 27 with the dynamic ring member 28 and the static ring member 29 is a flexible end.

[0028] Among them, the flexible end is a sponge strip or a cotton cloth strip with water-absorbing properties. Both the sponge strip and the cotton cloth strip are materials with excellent water absorption, which can store as much coolant as possible without causing leakage hazards due to the dripping of the coolant.

[0029] As Figure 2As shown, the water-absorbing member 27 has the same shape as the orientation of the lubricating channel, including a straight section 41 connected to the lubricating port 24, a first bent section 42 that bends upward and obliquely, and a second bent section 43 that bends toward the contact surface of the moving ring member 28 and the stationary ring member 29. The length of the first bent section 42 is greater than that of the straight section 41 and the first bent section 42. The angle between the first bent section 42 and the straight section 41 and the angle between the first bent section 42 and the second bent section 43 are both greater than 95 degrees and less than 180 degrees. Such a shape setting is conducive to allowing the straight section 41 to transfer the coolant adsorbed to the end of the second bent section as soon as possible after being sprayed by the first nozzle, facilitating quickly absorbing the coolant and then coating the outer side of the contact position between the moving ring member and the stationary ring member with the wet end, so that the coolant can enter the vicinity of the contact surface through coating and a small amount of liquid, playing a role in cooling and lubrication.

[0030] The free end of the second bent section 43 is a fan-shaped structure. The flexible end is located at the free end of the second bent section 43. It is convenient to absorb more coolant on the flexible material at the end of the free end, controlling the amount of coolant coated within a suitable range, neither causing excessive liquid nor failing to play a sufficient role in cooling and lubrication.

[0031] A plastic strip for maintaining the bent shape of the water-absorbing member 27 is provided inside the water-absorbing member 27, and the plastic strip has elasticity. This is convenient for the water-absorbing member to extend upward along the shape of the lubricating channel, and at the same time plays a role in supporting the shape of the water-absorbing material wrapped around the elastic plastic strip. The plastic strip has elasticity and is also convenient for quickly resetting when encountering slight resistance, enabling the flexible end to always maintain the best coating position.

[0032] The corresponding lecithin dryer in this embodiment includes a tank for drying. There is a filling port at the top of the tank. A stirring shaft connected to a motor at the top extends into the tank from top to bottom. A plurality of stirring blades are connected to the part of the stirring shaft extending into the tank. The part of the stirring shaft extending upward out of the tank is hermetically connected with a mechanical seal structure.

[0033] A cylindrical stabilizer is externally connected to the part of the stirring shaft extending out of the tank, and the stabilizer is used to reduce the swing of the stirring shaft; a shaft sleeve 32 is externally connected to the part of the stirring shaft extending out of the tank, and the stabilizer, the moving ring member 28, and the stationary ring member 29 are sleeved on the shaft sleeve 32 in sequence from top to bottom.

[0034] The upper end surfaces of the stabilizer and the moving ring member 28 form a single-end mechanical seal 22. Compared with the current double-end mechanical seal, the single-end mechanical seal 22 requires less lubrication and cooling, so that the amount of liquid to be used is smaller, and liquid leakage into the tank is avoided by reducing the amount of liquid from the source.

[0035] At the top of the tank body, a top plate 30 is provided outside the filling port. Below the static ring member 29, a baffle 31 for blocking sundries from entering the filling port is provided between the shaft sleeve 32 and the top plate 30. The baffle 31 is vertically arranged, and a limiting port for the baffle 31 to insert is provided at the bottom end of the main shaft sleeve 32. Through the arrangement of the limiting port at the bottom end of the shaft sleeve 32 and the baffle 31, after the baffle 31 is connected to the top plate 30, it is inserted upward into the limiting port, so that the baffle 31 and the shaft sleeve 32 restrict each other's vertical forms, sealing the gap between the filling port and the shaft sleeve 32 and avoiding the possibility of entering the tank body from here.

[0036] The mechanical seal structure includes a dynamic ring member 28 and a static ring member 29 arranged outside the stirring shaft. The dynamic ring member 28 is fixedly connected to the stirring shaft, and the static ring member 29 is fixedly connected to the tank body. The upper end surface of the static ring member 29 abuts against the lower end of the dynamic ring member 28; a lubrication channel is provided on one side of the dynamic ring member 28 and the static ring member 29, and a water-absorbing member 27 for extending into the lubrication channel and contacting the contact surfaces of the dynamic ring member 28 and the static ring member 29 is provided on one side of the lubrication channel; a lubrication port 24 for the water-absorbing member 27 to extend into the lubrication channel is provided on one side of the mechanical seal structure, and a first nozzle 25 for spraying coolant onto the dynamic ring member 28 and the static ring member 29 is provided on the lubrication port 24. The first nozzle 25 is located above the water-absorbing member 27; all the water-absorbing members 27 have a liquid absorption effect.

[0037] A lubricating member is provided at the end of the water-absorbing member 27. The lubricating member is a flexible water-absorbing material that can directly contact the end faces of the dynamic ring member 28 and the static ring member 29. The water-absorbing member 27 is strip-shaped, and a plastic spring is provided inside the end of the water-absorbing member 27 far from the dynamic ring member 28. The water-absorbing member 27 is strip-shaped, which is convenient for accurately contacting the position near the contact surfaces of the dynamic ring member 28 and the static ring member 29 in a small range. While reducing the liquid volume, it also reduces the contact area between the water-absorbing member 27 and the dynamic ring member 28 and the static ring member 29, reducing the relative resistance to the rotation of the dynamic ring member 28 and not affecting the normal rotation of the dynamic ring member 28. By arranging the plastic spring at a place far from the dynamic and static rings, it not only helps to maintain the strip shape of the water-absorbing member 27, but also helps the water-absorbing strip to return to the best contact position with the dynamic ring member 28 and the static ring member 29 after being deviated by external force. At the same time, it is beneficial for the water-absorbing member 27 to return to the position below the first nozzle 25, which is most conducive to absorbing the sprayed coolant.

[0038] A foreign object collection device is provided on the top plate 30. The foreign object collection device includes a first channel 33 located at the bottom end of the sleeve 32 for collecting foreign objects blocked by the baffle 31, a second channel 34 located below the first channel 33 and communicating with the first channel 33, a foreign object discharge port communicating with the second channel 34, and a vacuum pump communicating with the foreign object discharge port. When foreign objects such as metal residues and coolant fall from top to bottom and are blocked by the baffle 31 outside the first channel 33, the vacuum pump successively adsorbs the foreign objects from the first channel 33, the second channel 34, and the foreign object discharge port through the second channel 34 connected thereto by means of negative pressure adsorption, realizing the cleaning of the generated foreign objects and further avoiding the possibility of foreign objects falling into the tank.

[0039] The foreign object discharge port includes a horizontal discharge port 35 horizontally communicating with the second channel 34 and a vertical discharge port 36 vertically communicating with the second channel 34. When not in use, both ports can be blocked by a plugging member. When in use, the pipeline of the vacuum pump can be directly inserted into the corresponding discharge port to be temporarily communicated with the second channel 34.

[0040] The length of the second channel is more than twice the length of the first channel 33. While being able to collect foreign objects, it is convenient for the vacuum pump to be connected and adsorb.

[0041] A liquid leakage discharge port 37 is provided on the opposite side of the mechanical seal structure to the lubrication port 24. The liquid leakage discharge port 37 is located above the foreign object discharge port, and the liquid leakage discharge port 37 communicates with a third channel 38 located below the stationary ring member 29.

[0042] Through the third channel 38, the liquid falling from top to bottom below the stationary ring member 29 is discharged from the liquid leakage discharge port 37, which helps to make the subsequent foreign object collection more convenient. The liquid leakage discharge port can also be connected to the vacuum pump, and the liquid leakage is absorbed by the negative pressure of the vacuum pump.

[0043] An overflow port 23 is provided above the lubrication port 24. Through the overflow port 23, excessive coolant can flow out to avoid accumulation.

[0044] In this embodiment, an ordinary nozzle can be used for the first nozzle 25. Hoses for conveying coolant are connected to the outside of both nozzles. The nozzles can be remotely controlled. The nozzles themselves and their use are all conventional means, which will not be elaborated here, and the existing connection structures such as the nozzles and the hoses are not shown in the figure either.

[0045] In this embodiment, the water-absorbing member can be fixed in a variety of existing ways. For example, the straight section of the water-absorbing member can be pasted on the inner wall of the lubrication port with tape, the end of the straight section can be connected to a threaded hole already opened on the side wall of the lubrication port by a screw, or even the end of the straight section can be pulled out of the lubrication port and directly pasted or screwed to the outer wall of the mechanical seal structure.

[0046] In this embodiment, the plastic strip is integrally formed, and the water-absorbing material is pasted or wound around the outer periphery of the plastic strip. When installing the water-absorbing member, since the entire water-absorbing member is elastic due to the coating strip, after passing the straight section through the lubrication channel from top to bottom and out of the lubrication port, the entire water-absorbing member is fixed by fixing the straight section.

[0047] In this embodiment, by improving the mechanical seal structure above the tank body, a new lecithin dryer is provided. Compared with the current lecithin dryer, it is necessary to cool down by immersing the entire mechanical seal structure in cold water, and it is necessary to install a single mechanical seal at the position near the bearing 21, as well as at the positions of the moving ring member and the stabilizer. The present utility model reduces the number of single mechanical seals by improving the internal structure of the mechanical seal structure, and only the single mechanical seal 22 between the moving ring member 28 and the stabilizer needs to be left; the present utility model does not need to immerse the entire mechanical seal structure in cold water, and only needs to locally cool and lubricate the contact surface between the moving ring member 28 and the static ring member 29 through the water-absorbing member 27 and the first nozzle 25. On the premise of greatly reducing the liquid in the mechanical seal structure, the liquid leakage caused by wear can be reduced.

[0048] In addition, the first nozzle 25 is located above the water-absorbing member 27. The coolant sprayed by the first nozzle 25 directly acts on the contact surface between the moving ring member 28 and the static ring member 29, which not only plays a cooling role but also a lubricating role. The water-absorbing member 27 with liquid adsorption function is located below the first nozzle 25, and can well absorb the excess coolant sprayed by the first nozzle 25, and when the first nozzle 25 does not spray, it plays a role of contact lubrication and cooling through the contact between the water-absorbing member 27 and the contact surface of the moving ring member 28 and the static ring member 29. As the moving ring member 28 rotates relatively, the coolant on the water-absorbing member 27 is coated on the entire contact surface between the moving ring member 28 and the static ring member 29. At the same time, the wetted water-absorbing member 27 also has a certain function of adsorbing metal residues, and can play a role of collecting metal residues by regularly replacing the water-absorbing member 27.

[0049] In addition, the coolant acting as a lubricant can be adsorbed by the water-absorbing member 27 and gathered at the end, so that the lubricant can be applied between the contact surfaces of the moving ring member 28 and the static ring member 29 through the water-absorbing member 27. With this setting, the end surfaces of the moving ring member 28 and the static ring member 29 can obtain sufficient lubricant for end surface lubrication. Therefore, the probability of wear between the end surfaces of the moving ring member 28 and the static ring member 29 can be reduced, the service life of the equipment can be improved, and the metal residues generated by long-term friction can be reduced.

[0050] The utility model can effectively reduce the amount of liquid in the mechanical seal structure above the filling port of the tank body without affecting lubrication and cooling, avoiding liquid leakage into the tank body; it can reduce the generation of metal residues due to the mutual movement and wear of the moving ring member 28 and the static ring member 29. The utility model effectively solves the problem that metal residues, coolant or lubricating oil are likely to fall into the tank body as the use time of the lecithin dryer becomes longer, causing product contamination and even explosion risks.

[0051] Embodiment 2

[0052] As Figure 1 shown, in this embodiment, the mechanical seal structure includes a stabilizer and a single-end mechanical seal 22 formed by the upper end face of the moving ring member 28, and a vertical section 44 that extends upward and contacts the single-end mechanical seal 22 is connected to the first bending section 42.

[0053] As Figure 3 shown, in this embodiment, a second nozzle 26 is installed on the outer wall of the mechanical seal structure at the overflow port 23. The structure and installation method of the second nozzle 26 are the same as those of the first nozzle 25. The second nozzle 26 is located above the free end of the vertical section 44. The second nozzle 26 sprays coolant towards the single-end mechanical seal 22. The coolant directly acts on the outer side surface of the single-end mechanical seal 22 for cooling, and the excess coolant can be absorbed by the vertical section 44 of the absorbent member below.

[0054] The second nozzle 26 is installed at the upper position of the overflow port 23 and does not completely block the overflow port 23, not affecting the use of the overflow port 23. At the same time, the single-end mechanical seal 22 can be cooled and lubricated separately through the second nozzle 26.

[0055] The free end of the vertical section 44 is the same as the free end of the second bending section 43, both being flexible ends with good water absorption, capable of storing as much coolant as possible without generating excessive liquid flow, facilitating the cooling of the single-end mechanical seal.

[0056] The above are only embodiments of the utility model. Specific technical solutions and / or common knowledge such as characteristics well known in the art are not described in detail herein. It should be noted that for those skilled in the art, without departing from the technical solution of the utility model, several deformations and improvements can be made, which should also be regarded as the protection scope of the utility model, and these will not affect the implementation effect of the utility model and the practicality of the patent. The protection scope required by this application should be based on the content of its claims, and the specific implementation manners described in the specification can be used to interpret the content of the claims.

Claims

1. A dryer cooling structure for cooling the mechanical seal structure connected to the stirring shaft on the lecithin dryer, characterized in that: The mechanical seal structure includes a dynamic ring member and a static ring member arranged outside the stirring shaft. The dynamic ring member is fixedly connected to the stirring shaft, and the static ring member is fixedly connected to the tank body. The upper end surface of the static ring member abuts against the lower end of the dynamic ring member. The dryer cooling structure includes a lubrication channel located on one side of the mechanical seal structure. The lubrication channel is located on one side of the dynamic ring member and the static ring member. A lubrication port is communicated with the mechanical seal structure wall on the lubrication channel. A first nozzle for spraying coolant in the direction of the static ring member is arranged on the lubrication port. An absorbent member extending into the lubrication channel and contacting the contact surface of the dynamic ring member and the static ring member is also arranged on the lubrication port. The absorbent member is located below the first nozzle and is used to adsorb the coolant sprayed and dropped by the first nozzle. The absorbent member extends upward along the lubrication channel to the contact position of the dynamic ring member and the static ring member, and the contact end of the absorbent member with the dynamic ring member and the static ring member is a flexible end.

2. The dryer cooling structure according to claim 1, characterized in that: The flexible end is a sponge strip or a cotton cloth strip with water absorption performance.

3. The dryer cooling structure according to claim 1, characterized in that: The absorbent member has the same shape as the trend of the lubrication channel, including a straight section connected to the lubrication port, a first bent section bent upward obliquely, and a second bent section bent toward the contact surface of the dynamic ring member and the static ring member.

4. The dryer cooling structure according to claim 3, wherein: The mechanical seal structure includes a stabilizer and the upper end surface of the dynamic ring member to form a single-end face mechanical seal. A vertical section extending upward and contacting the single-end face mechanical seal is connected to the first bent section.

5. The dryer cooling structure according to claim 4, wherein: The flexible end is located at the free end of the second bent section and / or the vertical section.

6. The dryer cooling structure according to claim 3, characterized in that: A plastic strip for maintaining the bent shape of the absorbent member is arranged in the absorbent member, and the plastic strip has elasticity.

7. The dryer cooling structure according to claim 4, wherein: An overflow port is arranged above the lubrication port, and a second nozzle is installed on the overflow port. The second nozzle sprays coolant toward the single-end face mechanical seal. The second nozzle is located above the free end of the vertical section.

8. The dryer cooling structure according to claim 3, wherein: The length of the first bent section is greater than that of the straight section and the first bent section.

9. The dryer cooling structure according to claim 8, wherein: The free end of the second bent section is a fan-shaped structure.

10. The dryer cooling structure according to claim 8, wherein: The included angle between the first bent section and the straight section and the included angle between the first bent section and the second bent section are both greater than 95 degrees and less than 180 degrees.

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