Sealing device of vacuum rake dryer

Abstract

The utility model provides a sealing device of a vacuum rake dryer, which comprises a packing box, a sealing ring, a sealing ring and a sealing ring, and is characterized in that the packing box is fixedly connected with a shell of the vacuum rake dryer; the packing box is provided with a first center hole and a second center hole, the axes of the first center hole and the second center hole are collinear, and the first center hole is communicated with the second center hole; the diameter of the first center hole is larger than that of the second center hole, the first center hole and the second center hole are used for being connected with a rake type shaft in a sleeved mode, an annular cavity is formed between the inner side wall of the first center hole and the outer side wall of the rake type shaft, and a plurality of polytetrafluoroethylene packing bodies are arranged in the annular cavity in a wound mode. The hold-down ring is used for being connected with the rake type shaft in a sleeving mode, and one end of the hold-down ring extends into the annular cavity and abuts against the polytetrafluoroethylene packing; and the elastic piece abuts against the pressing ring and is used for enabling the elastic piece to be in an extruded state, and the pressing ring tends to be close to the polytetrafluoroethylene packing. The elastic force of the elastic piece is used for keeping the pressure of the pressing ring on the polytetrafluoroethylene packing, and the sealing performance is maintained.

Description

Technical Field

[0001] The utility model relates to a vacuum rake type drying machine sealing technology, in particular to a vacuum rake type drying machine sealing device. Background Art

[0002] Dryers are widely used in the fields of medicine, chemical industry, dyes, pesticides, food, etc. They are suitable for slurry, paste, powdery materials, heat-sensitive materials that require low-temperature drying, easily oxidized, explosive, highly irritating, and highly toxic materials, etc. The material to be dried is added into the shell, and a rake shaft is set along the length of the shell. The rake shaft is provided with rake teeth. The rake shaft is rotated so that the rake teeth continuously stir the material to be dried. The material to be dried moves back and forth in the axial direction of the rake shaft, and the dried material is discharged from the shell; in order to avoid leakage of materials or gas when the rake shaft is rotated, a mechanical seal is set at the end of the rake shaft. Due to the particularity of the force on the rake shaft, the mechanical seal at the end of the rake shaft is very easy to wear. The dryer is a large-scale equipment, and it is not easy to replace the mechanical seal. After the mechanical seal is worn, the seal fails, and gas leakage causes the material quality to decline or the medium to react violently. Utility Model Content

[0003] The utility model aims to provide a sealing device for a vacuum rake dryer, and aims to solve the technical problem that the mechanical seal fails to be worn out, resulting in leakage of materials or gas.

[0004] The utility model is realized by the following technical solutions:

[0005] A sealing device for a vacuum rake dryer, comprising:

[0006] A stuffing box, used for being fixedly connected to the housing of the vacuum rake dryer; the stuffing box is provided with a first center hole and a second center hole, the axes of the first center hole and the second center hole are collinear, and the first center hole and the second center hole are connected;

[0007] The first center hole is larger than the second center hole, the first center hole and the second center hole are used to sleeve the rake shaft, the inner side wall of the first center hole is used to form an annular cavity with the outer side wall of the rake shaft, and a plurality of polytetrafluoroethylene packings are wound in the annular cavity;

[0008] A clamping ring, the clamping ring is used for sleeve connection with the rake shaft, and one end of the clamping ring extends into the annular cavity and abuts against the polytetrafluoroethylene packing;

[0009] The elastic member fixes one end of the elastic member, and the other end of the elastic member abuts against the other end of the clamping ring, so as to make the elastic member in an extruded state, so that the clamping ring has a tendency to approach the polytetrafluoroethylene packing.

[0010] The sealing device mainly forms an annular cavity through a stuffing box, a first central hole and a rake-type shaft, and a plurality of polytetrafluoroethylene packings are wound in the annular cavity to achieve a sealing effect.

[0011] The stuffing box is fixedly connected to the housing of the vacuum rake dryer, the axes of the first center hole and the second center hole are colinear, and the first center hole and the second center hole are connected; so that the shaft of the dryer (rake shaft) can pass through the stuffing box, and at the same time, the polytetrafluoroethylene packing can form an effective seal in the annular cavity;

[0012] In order to make the polytetrafluoroethylene packing better adapt to the shape and size of the rake shaft, the aperture of the first center hole is set to be larger than the aperture of the second center hole; the polytetrafluoroethylene packing has good wear resistance and self-lubricating properties and can still maintain the sealing effect after wear.

[0013] The clamping ring is used to sleeve the rake shaft, and one end of the clamping ring extends into the annular cavity and abuts against the polytetrafluoroethylene packing. This design can apply pressure to the polytetrafluoroethylene packing through the clamping ring, thereby enhancing the sealing effect.

[0014] The elastic member is fixed on the stuffing box, and the other end of the elastic member is in contact with the other end of the clamping ring, so as to make the clamping ring have a tendency to approach the polytetrafluoroethylene packing. When the polytetrafluoroethylene packing is worn, the elastic force of the elastic member can continue to maintain the pressure of the clamping ring on the polytetrafluoroethylene packing, thereby maintaining the sealing effect; due to the elastic force of the elastic member, the gap generated by the wear of the polytetrafluoroethylene packing can also be compensated within a certain range, further improving the sealing effect.

[0015] In general, the sealing device of this vacuum rake dryer can maintain the sealing effect after the PTFE packing is worn, avoiding the problem of gas leakage causing material quality degradation or violent reaction of the medium. At the same time, due to the use of PTFE packing and elastic parts, it becomes easier to replace the PTFE packing.

[0016] Furthermore, a shaft sleeve is provided, which is used to be sleeved outside the rake shaft, and the shaft sleeve is fixedly connected to the rake shaft;

[0017] The stuffing box and the clamping ring are both sleeved on the outside of the shaft sleeve.

[0018] In order to further enhance the stability and durability of the sealing device, a sleeve is provided between the rake shaft and the stuffing box. The sleeve can protect the rake shaft and prevent the rake shaft from directly contacting the stuffing box and the clamping ring, thereby reducing friction and wear. At the same time, the sleeve is fixedly connected to the rake shaft, which can ensure that the sleeve rotates with the rake shaft, thereby improving the synchronization and stability of the sealing device;

[0019] The stuffing box and the clamping ring are both sleeved outside the shaft sleeve. This design can make the sealing device more stable and reliable. Due to the support of the shaft sleeve, the stuffing box and the clamping ring will not produce excessive vibration or displacement due to friction or inertia, thus ensuring the stability and durability of the sealing effect;

[0020] In summary, the sealing device can maintain the sealing effect of the polytetrafluoroethylene packing after wear through the synergistic effect of the shaft sleeve, stuffing box, clamping ring and elastic member, thereby avoiding the problem of material quality degradation or violent reaction of the medium caused by gas leakage.

[0021] Furthermore, an O-ring is sleeved on the inner wall of the shaft sleeve for contacting the outer wall of the rake shaft.

[0022] In order to further enhance the sealing performance of the vacuum rake dryer, an O-ring is arranged on the inner wall of the sleeve. The O-ring is usually made of elastic material and can fit tightly on the outer wall of the rake shaft, thereby forming an additional sealing layer to prevent leakage between the rake shaft and the sleeve. The setting of the O-ring can not only reduce the leakage of gas and materials inside the dryer, but also effectively prevent external media from entering the dryer, thereby ensuring the safety and stability of the dryer.

[0023] Furthermore, a plurality of labyrinth sealing rings are arranged in the second center hole, and the plurality of labyrinth sealing rings are arranged along the axial direction of the second center hole.

[0024] To further enhance the sealing performance of the vacuum rake dryer, a labyrinth seal is provided in the stuffing box. The labyrinth seal is usually composed of a series of continuous tortuous channels that can confine the gas or material to a specific area, thereby preventing it from leaking or entering an unwanted area. The labyrinth seal is provided in the second center hole, which can effectively reduce the leakage of gas and material inside the dryer and prevent external media from entering the dryer.

[0025] Because labyrinth seals consist of a continuous tortuous channel, they can provide multiple sealing effects. Even after the PTFE packing is worn, the labyrinth seals can still provide a certain sealing effect, thereby extending the service life of the dryer.

[0026] Furthermore, the side wall of the stuffing box is provided with a discharge port, which is communicated with the second center hole;

[0027] The discharge port is provided with a discharge pipe, and a ball valve is provided in the discharge pipe.

[0028] The side wall of the stuffing box is provided with a discharge port, which is communicated with the second center hole, which means that the worn polytetrafluoroethylene packing debris and the material that has passed through the labyrinth seal in the stuffing box can be discharged regularly through the discharge port to ensure reliable sealing. When the polytetrafluoroethylene packing needs to be replaced or other maintenance operations are required, the debris and materials can be discharged from the discharge port first, thereby avoiding the situation where the debris and materials enter the air or block the equipment during operation.

[0029] In order to better control the unloading process, the unloading pipe is set on the unloading port, which can guide the flow direction of the material during the unloading process and maintain the fluidity of the material. At the same time, a ball valve is set in the unloading pipe to control the flow rate and flow direction of the material. Through the switch control of the ball valve, the unloading process can be easily controlled, thereby improving the safety and convenience of operation.

[0030] In summary, the sealing device of this vacuum rake dryer can maintain the sealing effect after the polytetrafluoroethylene packing is worn through the setting of the discharge port, discharge pipe and ball valve, avoiding the problem of gas leakage causing material quality degradation or violent reaction of the medium. At the same time, the setting of these structures also makes the unloading process more convenient and safe, improving the operating efficiency and equipment safety.

[0031] Furthermore, the clamping ring is connected to the stuffing box via a limiting rod, and the limiting rod is parallel to the axis of the first center hole.

[0032] In order to further enhance the sealing performance and stability of the vacuum rake dryer, the clamping ring is connected to the stuffing box by a limiting rod, and the limiting rod is parallel to the axis of the first center hole. The limiting rod can guide the clamping ring when it moves and also realize axial limitation of the clamping ring.

[0033] The stop rods can also provide additional support and stability when replacing the PTFE packing. Before removing the hold-down ring, the position of the hold-down ring can be adjusted by rotating the stop rods to move it closer to or further away from the stuffing box, thereby facilitating the replacement of the PTFE packing.

[0034] At the same time, the presence of the limit rod can better ensure the relative position relationship between the stuffing box and the clamping ring. Even after the PTFE packing is worn, due to the support of the limit rod, the stuffing box and the clamping ring will not vibrate or deviate excessively due to friction or inertia, thus ensuring the stability and durability of the sealing effect.

[0035] In summary, the sealing device of this vacuum rake dryer can maintain the sealing effect after the polytetrafluoroethylene packing is worn through the synergistic effect of the limit rod, sleeve, O-ring, labyrinth seal and other structures, avoiding the problem of gas leakage causing material quality degradation or violent reaction of the medium. At the same time, the setting of the limit rod makes the entire sealing device more stable and reliable, improving the operating efficiency and safety of the dryer.

[0036] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0037] The sealing device mainly forms an annular cavity through a stuffing box, a first central hole and a rake-type shaft, and a plurality of polytetrafluoroethylene packings are wound in the annular cavity to achieve a sealing effect.

[0038] The stuffing box is fixedly connected to the housing of the vacuum rake dryer, the axes of the first center hole and the second center hole are colinear, and the first center hole and the second center hole are connected; so that the shaft of the dryer (rake shaft) can pass through the stuffing box, and at the same time, the polytetrafluoroethylene packing can form an effective seal in the annular cavity;

[0039] The clamping ring is used for sleeve connection with the rake shaft, and one end of the clamping ring extends into the annular cavity and abuts against the polytetrafluoroethylene packing. The clamping ring applies pressure to the polytetrafluoroethylene packing, thereby enhancing the sealing effect.

[0040] The elastic member is fixed on the stuffing box, and the other end of the elastic member is in contact with the other end of the clamping ring, so as to make the clamping ring have a tendency to approach the polytetrafluoroethylene packing. When the polytetrafluoroethylene packing is worn, the elastic force of the elastic member can continue to maintain the pressure of the clamping ring on the polytetrafluoroethylene packing, thereby maintaining the sealing effect; due to the elastic force of the elastic member, the gap generated by the wear of the polytetrafluoroethylene packing can also be compensated within a certain range, further improving the sealing effect.

[0041] In general, the sealing device of this vacuum rake dryer can maintain the sealing effect after the polytetrafluoroethylene packing is worn, avoiding the problem of gas leakage causing material quality degradation or violent reaction of the medium. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present utility model, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present utility model, and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work. In the drawings:

[0043] Figure 1It is a schematic diagram of the structure after the sealing device is connected with the rake shaft and the housing;

[0044] Figure 2 for Figure 1 Disassembly diagram of the middle sealing device;

[0045] Figure 3 for Figure 2 A magnified view of middle;

[0046] Figure 4 It is a schematic diagram of the structure after the sealing device with a shaft sleeve is connected to the rake shaft and the housing;

[0047] Figure 5 for Figure 4 Disassembly diagram of the middle sealing device;

[0048] Figure 6 for Figure 5 Enlarged view of middle B;

[0049] Figure 7 It is a schematic diagram of the structure of the stuffing box.

[0050] Marks and corresponding parts names in the attached drawings:

[0051] 1. Rake shaft; 2. Fastening bolts; 3. Bushing; 4. Limit rod; 5. Elastic member; 6. Pressure ring; 7. Stuffing box; 71. Discharge port; 72. Labyrinth seal; 73. First center hole; 74. Second center hole; 8. Discharge pipe; 9. Ball valve; 10. O-ring; 11. Polytetrafluoroethylene packing; 12. Annular cavity. DETAILED DESCRIPTION

[0052] In order to make the purpose, technical solutions and advantages of the utility model more clearly understood, the utility model is further described in detail below in conjunction with embodiments and drawings. The schematic implementation manner of the utility model and its description are only used to explain the utility model and are not intended to limit the utility model.

[0053] Example 1

[0054] Combination Figure 1 , Figure 2 and Figure 7 , this embodiment 1 provides a sealing device for a vacuum rake dryer, comprising:

[0055] The stuffing box 7 is used to be fixedly connected to the housing of the vacuum rake dryer, and can be connected by bolts or welding; the stuffing box 7 is provided with a first center hole 73 and a second center hole 74, the axes of the first center hole 73 and the second center hole 74 are collinear, and the first center hole 73 and the second center hole 74 are connected;

[0056] The first center hole 73 is larger than the second center hole 74. The first center hole 73 and the second center hole 74 are used to sleeve the rake shaft 1. The inner side wall of the first center hole 73 is used to form an annular cavity 12 with the outer side wall of the rake shaft 1. A plurality of polytetrafluoroethylene packings 11 are wound in the annular cavity 12.

[0057] A clamping ring 6, wherein the clamping ring 6 is used for sleeve connection with the rake shaft 1, and one end of the clamping ring 6 extends into the annular cavity 12 and abuts against the polytetrafluoroethylene packing 11;

[0058] The elastic member 5 may be a medium-load rectangular spring, fixing one end of the elastic member 5 , and the other end of the elastic member 5 abutting against the other end of the clamping ring 6 , so as to make the elastic member 5 in an extruded state, so that the clamping ring 6 has a tendency to approach the polytetrafluoroethylene packing 11 .

[0059] The sealing device mainly forms an annular cavity 12 through the stuffing box 7, the first central hole 73 and the rake shaft 1, and a plurality of polytetrafluoroethylene packings 11 are wound in the annular cavity 12 to achieve a sealing effect.

[0060] The stuffing box 7 is fixedly connected to the housing of the vacuum rake dryer, and the axes of the first center hole 73 and the second center hole 74 are colinear, and the first center hole 73 and the second center hole 74 are connected; so that the shaft of the dryer (rake shaft 1) can pass through the stuffing box 7, and at the same time, the polytetrafluoroethylene packing 11 can form an effective seal in the annular cavity 12;

[0061] In order to allow the polytetrafluoroethylene packing 11 to better adapt to the shape and size of the rake shaft 1, the aperture of the first center hole 73 is set to be larger than the aperture of the second center hole 74; the polytetrafluoroethylene packing 11 has good wear resistance and self-lubricating properties and can still maintain a sealing effect after slight wear.

[0062] The clamping ring 6 is used to sleeve the rake shaft 1, and one end of the clamping ring 6 extends into the annular cavity 12 and abuts against the polytetrafluoroethylene packing 11. This design can apply pressure to the polytetrafluoroethylene packing 11 through the clamping ring 6, thereby enhancing the sealing effect.

[0063] The elastic member 5 is fixed on the stuffing box 7, and the other end of the elastic member 5 is in contact with the other end of the clamping ring 6, so as to make the clamping ring 6 have a tendency to approach the polytetrafluoroethylene packing 11. When the polytetrafluoroethylene packing 11 is worn, the elastic force of the elastic member 5 can continue to maintain the pressure of the clamping ring 6 on the polytetrafluoroethylene packing 11, thereby maintaining the sealing effect; due to the elastic force of the elastic member 5, the gap generated by the wear of the polytetrafluoroethylene packing 11 can also be compensated within a certain range, thereby further improving the sealing effect.

[0064] In general, the sealing device of the vacuum rake dryer can maintain the sealing effect after the polytetrafluoroethylene packing 11 is worn, avoiding the problem of gas leakage causing the quality of the material to deteriorate or the medium to react violently. At the same time, due to the use of the polytetrafluoroethylene packing 11 and the elastic member 5, it becomes easier to replace the polytetrafluoroethylene packing 11.

[0065] Example 2

[0066] Combination Figure 4 , Figure 5 and Figure 7 On the basis of embodiment 1, a sleeve 3 is further provided, and the sleeve 3 is used to be sleeved outside the rake shaft 1. The sleeve 3 is fixedly connected to the rake shaft 1, and the sleeve 3 and the rake shaft 1 can be connected by fastening bolts 2;

[0067] The stuffing box 7 and the clamping ring 6 are both sleeved on the outside of the shaft sleeve 3 , and the polytetrafluoroethylene packing 11 is wound around the shaft sleeve 3 .

[0068] In order to further enhance the stability and durability of the sealing device, a sleeve 3 is provided between the rake shaft 1 and the stuffing box 7. The sleeve 3 can protect the rake shaft 1 and prevent the rake shaft 1 from directly contacting the stuffing box 7 and the clamping ring 6, thereby reducing friction and wear. At the same time, the sleeve 3 is fixedly connected to the rake shaft 1, which can ensure that the sleeve 3 rotates with the rake shaft 1, thereby improving the synchronization and stability of the sealing device;

[0069] The stuffing box 7 and the clamping ring 6 are both sleeved outside the shaft sleeve 3. This design can make the sealing device more stable and reliable. Due to the support of the shaft sleeve 3, the stuffing box 7 and the clamping ring 6 will not produce excessive vibration or displacement due to friction or inertia, thereby ensuring the stability and durability of the sealing effect;

[0070] In summary, the sealing device can maintain the sealing effect of the polytetrafluoroethylene packing 11 after wear through the synergistic effect of the shaft sleeve 3, stuffing box 7, clamping ring 6 and elastic member 5, thereby avoiding the problem of gas leakage causing material quality degradation or violent reaction of the medium.

[0071] Example 3

[0072] Combination Figure 3 and Figure 6 On the basis of the second embodiment, two O-rings 10 are sleeved on the inner wall of the sleeve 3 for contacting the outer wall of the rake shaft 1.

[0073] In order to further enhance the sealing performance of the vacuum rake dryer, an O-ring 10 is arranged on the inner wall of the sleeve 3. The O-ring 10 is usually made of elastic material and can fit tightly on the outer wall of the rake shaft 1, thereby forming an additional sealing layer to prevent leakage between the rake shaft 1 and the sleeve 3; the arrangement of the O-ring 10 can not only reduce the leakage of gas and materials inside the dryer, but also effectively prevent external media from entering the dryer, thereby ensuring the safety and stability of the dryer.

[0074] Example 4

[0075] Combination Figure 3 , Figure 6 and Figure 7 Based on any of the above embodiments, four labyrinth seals 72 are disposed in the second center hole 74 , and the four labyrinth seals 72 are arranged along the axial direction of the second center hole 74 .

[0076] In order to further enhance the sealing performance of the vacuum rake dryer, a labyrinth seal 72 is provided in the stuffing box 7. The labyrinth seal 72 is generally composed of a series of continuous tortuous channels, which can confine the gas or material in a specific area, thereby preventing it from leaking or entering an unwanted area. The labyrinth seal 72 is provided in the second center hole 74, which can effectively reduce the leakage of gas and material inside the dryer and prevent external media from entering the dryer.

[0077] Since the labyrinth seals 72 are composed of continuous tortuous channels, they can provide multiple sealing effects. Even after the polytetrafluoroethylene packing 11 is worn, the labyrinth seals 72 can still provide a certain sealing effect, thereby extending the service life of the dryer. In addition, the labyrinth seal 72 is machined on the basis of the second center hole 74, and does not need to be replaced or maintained in the later stage. The setting of the labyrinth seal 72 effectively prevents the material in the cylinder of the rake dryer from entering the polytetrafluoroethylene packing 11, reduces the wear of the polytetrafluoroethylene packing 11, and increases the sealing life.

[0078] Example 5

[0079] Combination Figure 1 , Figure 3 , Figure 4 , Figure 6 and Figure 7 , and on the basis of any of the above embodiments, the side wall of the stuffing box 7 is provided with a discharge port 71, and the discharge port 71 is communicated with the second central hole 74;

[0080] The discharge port 71 is provided with a discharge pipe 8 , and a ball valve 9 is provided inside the discharge pipe 8 .

[0081] The side wall of the stuffing box 7 is provided with a discharge port 71, which is communicated with the second center hole 74, which means that the worn polytetrafluoroethylene packing 11 debris in the stuffing box 7 and the material that has passed through the labyrinth seal 72 can be discharged regularly through the discharge port 71 to ensure reliable sealing. When the polytetrafluoroethylene packing 11 needs to be replaced or other maintenance operations are required, the debris and materials can be discharged from the discharge port 71 first, thereby preventing the debris and materials from entering the air or clogging the equipment during operation.

[0082] In order to better control the unloading process, the unloading pipe 8 is arranged on the unloading port 71, which can guide the flow direction of the material during the unloading process and maintain the fluidity of the material. At the same time, a ball valve 9 is arranged in the unloading pipe 8 to control the flow rate and flow direction of the material. Through the switch control of the ball valve 9, the unloading process can be conveniently controlled, thereby improving the safety and convenience of the operation.

[0083] In summary, the sealing device of the vacuum rake dryer can maintain the sealing effect after the polytetrafluoroethylene packing 11 is worn through the arrangement of the discharge port 71, the discharge pipe 8 and the ball valve 9, thereby avoiding the problem of gas leakage causing the material quality to deteriorate or the medium to react violently. At the same time, the arrangement of these structures also makes the discharge process more convenient and safe, and improves the operating efficiency and equipment safety.

[0084] Example 6

[0085] Combination Figure 1 and Figure 4 On the basis of any of the above embodiments, the clamping ring 6 is connected to the stuffing box 7 via a limiting rod 4 , and the limiting rod 4 is parallel to the axis of the first center hole 73 .

[0086] A threaded hole is provided on the stuffing box 7, and a through hole is provided on the clamping ring 6; the limit rod 4 can adopt a clamping bolt, which consists of a head, a smooth rod and a threaded rod, and the two ends of the smooth rod are respectively connected to the head and the threaded rod, and the threaded rod is provided with threads, and the threads on the threaded rod are adapted to the threaded hole on the stuffing box 7, and the smooth rod passes through the through holes of the elastic member 5 and the clamping ring 6 in sequence.

[0087] In order to further enhance the sealing performance and stability of the vacuum rake dryer, the clamping ring 6 is connected to the stuffing box 7 by a limiting rod 4. The limiting rod 4 is parallel to the axis of the first center hole 73. The limiting rod 4 can guide the clamping ring 6 when it moves and can also realize axial limitation of the clamping ring 6.

[0088] The limit rod 4 can also provide additional support and stability when replacing the polytetrafluoroethylene packing 11. Before removing the clamping ring 6, the position of the clamping ring 6 can be adjusted by rotating the limit rod 4 to make it closer to or farther away from the stuffing box 7, thereby facilitating the replacement of the polytetrafluoroethylene packing 11.

[0089] At the same time, due to the existence of the limiting rod 4, the relative position relationship between the stuffing box 7 and the clamping ring 6 can be better guaranteed. Even after the polytetrafluoroethylene packing 11 is worn, due to the support of the limiting rod 4, the stuffing box 7 and the clamping ring 6 will not produce excessive vibration or displacement due to the friction or inertia force, thereby ensuring the stability and durability of the sealing effect.

[0090] In summary, the sealing device of the vacuum rake dryer can maintain the sealing effect after the polytetrafluoroethylene packing 11 is worn through the synergistic effect of the limit rod 4, the sleeve 3, the O-ring 10, the labyrinth seal 72 and other structures, thereby avoiding the problem of gas leakage causing the material quality to deteriorate or the medium to react violently. At the same time, the setting of the limit rod 4 makes the entire sealing device more stable and reliable, and improves the operating efficiency and safety of the dryer.

[0091] The working process of the seal after wear is as follows:

[0092] After the polytetrafluoroethylene packing 11 is worn, the medium-load rectangular spring automatically extends, pushing the clamping ring 6 along the limit rod 4 to move closer to the stuffing box 7, so that the clamping ring 6 extending into the annular cavity 12 automatically compresses the polytetrafluoroethylene packing 11 to ensure reliable sealing;

[0093] When the polytetrafluoroethylene packing 11 is worn to a certain extent, the limit rod 4, the medium-load rectangular spring and the clamping ring 6 can be removed, and the polytetrafluoroethylene packing 11 with a corresponding length of wear can be added and wound around the shaft sleeve 3. Then the clamping ring 6, the medium-load rectangular spring and the limit rod 4 are installed and continued to be used. The process of replacing the polytetrafluoroethylene packing 11 is simple and quick.

[0094] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only the specific implementation method of the utility model and is not used to limit the protection scope of the utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A sealing device for a vacuum rake dryer, characterized in that: include: A stuffing box (7) is used for being fixedly connected to a housing of a vacuum rake dryer; the stuffing box (7) is provided with a first center hole (73) and a second center hole (74), the axes of the first center hole (73) and the second center hole (74) are collinear, and the first center hole (73) and the second center hole (74) are in communication; The first center hole (73) is larger than the diameter of the second center hole (74); the first center hole (73) and the second center hole (74) are used to sleeve the rake shaft (1); the inner side wall of the first center hole (73) is used to form an annular cavity (12) with the outer side wall of the rake shaft (1); a plurality of polytetrafluoroethylene packings (11) are wound in the annular cavity (12); A clamping ring (6), the clamping ring (6) is used for sleeve-joining the rake shaft (1), and one end of the clamping ring (6) extends into the annular cavity (12) and abuts against the polytetrafluoroethylene packing (11); An elastic member (5) fixes one end of the elastic member (5), and the other end of the elastic member (5) abuts against the other end of the clamping ring (6) to make the elastic member (5) in an extruded state, and the clamping ring (6) has a tendency to approach the polytetrafluoroethylene packing (11).

2. The sealing device of a vacuum rake dryer according to claim 1, characterized in that: A shaft sleeve (3) is also provided, and the shaft sleeve (3) is used to be sleeved on the outside of the rake shaft (1), and the shaft sleeve (3) is fixedly connected to the rake shaft (1); The stuffing box (7) and the clamping ring (6) are both sleeved on the outside of the shaft sleeve (3).

3. The sealing device of a vacuum rake dryer according to claim 2, characterized in that: An O-type sealing ring (10) is sleeved on the inner side wall of the shaft sleeve (3) for contacting the outer side wall of the rake shaft (1).

4. A sealing device for a vacuum rake dryer according to claim 2 or 3, characterized in that: A plurality of labyrinth sealing rings (72) are arranged in the second center hole (74), and the plurality of labyrinth sealing rings (72) are arranged along the axial direction of the second center hole (74).

5. The sealing device of a vacuum rake dryer according to claim 4, characterized in that: The side wall of the stuffing box (7) is provided with a discharge port (71), and the discharge port (71) is communicated with the second central hole (74); The discharge port (71) is provided with a discharge pipe (8), and a ball valve (9) is provided inside the discharge pipe (8).

6. The sealing device of a vacuum rake dryer according to claim 1, characterized in that: The clamping ring (6) is connected to the stuffing box (7) via a limiting rod (4), and the limiting rod (4) is parallel to the axis of the first center hole (73).

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