Special combined sealing filler for drying machine

Abstract

The utility model discloses a special combined sealing filler for a drying machine, which comprises a first woven filler, a second woven filler, a first metal sealing ring, a first V-shaped cloth-sandwiched filler ring group, a second metal sealing ring and a second V-shaped cloth-sandwiched filler ring group from inside to outside, the first V-shaped cloth clamping packing ring set and the second V-shaped cloth clamping packing ring set are each formed by stacking a plurality of V-shaped cloth clamping sealing rings, and the first metal sealing ring is arranged between the second woven packing and the first V-shaped cloth clamping packing ring set. And the second metal sealing ring is arranged between the first V-shaped cloth clamping packing ring group and the second V-shaped cloth clamping packing ring group. The scheme has the beneficial effects that the corrosion resistance, the deflection resistance and the weather resistance are better, the water permeability is low, and the PTA drying machine is suitable for the severe working condition of the PTA drying machine.

Description

Technical Field

[0001] The utility model belongs to the technical field of sealing fillers, in particular to a special combined sealing filler for a dryer. Background Art

[0002] Packing, also known as sealing filler, is usually woven from softer threads, usually with square, rectangular or round cross-sectional areas, and filled in the sealing cavity to achieve sealing; the earliest packing seal was to plug cotton and linen fibers in the leakage channel to prevent liquid leakage, and was mainly used as the shaft seal of water-lifting machinery. Due to the wide range of sources, easy processing, low price, reliable sealing and simple operation of the packing, it has been used to this day. Today, packing is widely used in centrifugal pumps, compressors, vacuum pumps, mixers and ship propeller shaft seals, piston pumps, reciprocating compressors, refrigeration machine reciprocating shaft seals, and various valve stem rotary seals; however, the existing sealing packing will have a short lifespan during the use of PTA dryers, and is easily corroded and contaminated, which will affect the quality of CTA or PTA. Utility Model Content

[0003] In order to solve the above technical problems, the utility model provides a combined sealing packing for dryers, which has good corrosion resistance, flexibility resistance and weather resistance, low water permeability, and is suitable for severe working conditions of PTA dryers. The specific technical scheme is as follows:

[0004] A combined sealing packing specially used for a dryer comprises, from inside to outside, a first braided packing, a second braided packing, a first metal sealing ring, a first V-shaped cloth packing ring group, a second metal sealing ring and a second V-shaped cloth packing ring group, wherein the first braided packing and the second braided packing are arranged in close contact, the first V-shaped cloth packing ring group and the second V-shaped cloth packing ring group are both formed by stacking a plurality of V-shaped cloth sealing rings, the first metal sealing ring is arranged between the second braided packing and the first V-shaped cloth packing ring group, the second metal sealing ring is arranged between the first V-shaped cloth packing ring group and the second V-shaped cloth packing ring group, the V-shaped cloth sealing ring is formed by molding fluororubber or butyl rubber and aramid fiber, and the first metal sealing ring and the second metal sealing ring are provided with channels for coolant to pass through.

[0005] Preferably, the first braided packing is a packing braided from polytetrafluoroethylene fibers.

[0006] Preferably, the polytetrafluoroethylene fiber strength is 17.7-18.5 cN / dtex.

[0007] Preferably, the second braided packing is a packing braided of polytetrafluoroethylene fiber and tetragonal aramid.

[0008] Preferably, the polytetrafluoroethylene fiber strength is 17.7-18.5 cN / dtex.

[0009] Preferably, the hole penetrates the first metal sealing ring and the second metal sealing ring in the axial direction.

[0010] Preferably, the cross-section of the V-shaped cloth-inserted sealing ring is V-shaped, and a retreat groove is provided at the bottom end of the opening of the V-shaped cloth-inserted sealing ring.

[0011] Preferably, the opening angle of the V-shaped cloth-inserted sealing ring is 90 degrees.

[0012] The beneficial effects of the utility model are:

[0013] (1) The first braided packing is made of polytetrafluoroethylene fibers. The polytetrafluoroethylene fibers have a small friction coefficient and good weather resistance, flexural resistance and corrosion resistance. They have a good service life and are clean and pollution-free, and will not affect the quality of CTA or PTA.

[0014] (2) The second braided filler is braided with polytetrafluoroethylene fiber and tetragonal aramid fiber. The tetragonal aramid fiber plays a role of reinforcement and wear resistance.

[0015] (3) The first metal sealing ring and the second metal sealing ring adopt a combination of metal sealing rings and coolant to ensure sealing performance while providing a certain heat dissipation capacity, so that the combined filler can better adapt to harsh environments.

[0016] (4) The V-type cloth seal ring is molded with fluororubber + aramid fiber cloth or butyl rubber + aramid fiber cloth. Fluororubber has excellent heat resistance, oil resistance, corrosion resistance, wear resistance and atmospheric aging resistance. The excellent physical and mechanical properties of fluororubber make it suitable for various fluctuating working conditions. Butyl rubber is resistant to acetic acid and heat, has a very low water permeability and has excellent characteristics of absorbing vibration and impact energy, and can adapt to fluctuating working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the utility model.

[0018] Figure 2 It is a cross-sectional view of the V-shaped cloth-inserted sealing ring of the utility model.

[0019] In the figure: a first braided packing 1, a second braided packing 2, a first V-shaped cloth packing ring group 3, a second V-shaped cloth packing ring group 4, a V-shaped cloth sealing ring 5, a first metal sealing ring 6, a second metal sealing ring 7, a retreat groove 8, and a channel 9. DETAILED DESCRIPTION

[0020] Example 1

[0021] Embodiment 1 provides a combined sealing packing for a dryer. Figure 1 As shown, the combined sealing packing for the dryer in this example includes, from the inside to the outside, a first braided packing 1, a second braided packing 2, a first metal sealing ring 6, a first V-shaped cloth packing ring group 3, a second metal sealing ring 7, and a second V-shaped cloth packing ring group 4. The first braided packing 1 and the second braided packing 2 are arranged in close proximity, the first V-shaped cloth packing ring group 3 and the second V-shaped cloth packing ring group 4 are both formed by stacking a number of V-shaped cloth sealing rings 5, the first metal sealing ring 6 is arranged between the second braided packing 2 and the first V-shaped cloth packing ring group 3, and the second metal sealing ring 7 is arranged between the first V-shaped cloth packing ring group 3 and the second V-shaped cloth packing ring group 4. The two metal sealing rings in this example are both made of stainless steel. The V-shaped cloth sealing ring 5 is molded from fluororubber and aramid fiber. Specifically, the first braided packing 1 is a packing woven from polytetrafluoroethylene fibers, and the strength of the polytetrafluoroethylene fibers used is 17.7 cN / dtex; the second braided packing 2 is a packing woven from polytetrafluoroethylene fibers and tetragonal aramid fibers, and the strength of the polytetrafluoroethylene fibers used is also 17.7 cN / dtex. The first metal sealing ring 6 and the second metal sealing ring 7 are provided with a channel 9 that passes through the interior in the vertical direction, and the coolant can flow through the channel 9. The specific components of the coolant can be selected and assembled from conventional components by those skilled in the art as needed.

[0022] See also Figure 2 As shown, the cross section of the V-shaped cloth-inserted sealing ring 5 is V-shaped, and the bottom end of the opening of the V-shaped cloth-inserted sealing ring 5 is provided with a retreat groove 8. The opening angle of the V-shaped cloth-inserted sealing ring 5 is 90 degrees.

[0023] In the scheme provided in this embodiment, the first braided filler 1 is woven from polytetrafluoroethylene fibers. The polytetrafluoroethylene fibers have a small friction coefficient and have good weather resistance, flex resistance and corrosion resistance. They have a good service life and are clean and pollution-free, and will not affect the quality of CTA or PTA. The second braided filler 2 is woven from polytetrafluoroethylene fibers and four-corner aramid fibers. The four-corner aramid fibers play a role in strengthening and wear resistance. The V-shaped cloth-clamped sealing ring 5 is molded from fluororubber + aramid fiber cloth or butyl rubber + aramid fiber cloth. Fluororubber has excellent heat resistance, oil resistance, corrosion resistance, wear resistance and atmospheric aging resistance. The excellent physical and mechanical properties of fluororubber make it suitable for various fluctuating working conditions. Butyl rubber is acetic acid resistant and heat resistant, and its water permeability is extremely low. Butyl rubber has excellent characteristics of receiving vibration and impact energy, and can adapt to fluctuating working conditions. In this embodiment, a first gap and a second gap are provided, and gas seals, such as nitrogen seals, can be configured in the two gaps according to the sealing requirements of the PTA dryer, which can further ensure the sealing performance of the packing. The first metal sealing ring 6 and the second metal sealing ring 7 are a combination of a metal sealing ring and a coolant, which ensures the sealing performance while providing a certain heat dissipation capacity, so that the combined packing can better adapt to harsh environments.

[0024] Example 2

[0025] Embodiment 2 provides another combined sealing packing for dryers. Figure 1 As shown, the combined sealing packing for the dryer in this example includes, from the inside to the outside, a first braided packing 1, a second braided packing 2, a first metal sealing ring 6, a first V-shaped cloth packing ring group 3, a second metal sealing ring 7, and a second V-shaped cloth packing ring group 4. The first braided packing 1 and the second braided packing 2 are arranged in close proximity, the first V-shaped cloth packing ring group 3 and the second V-shaped cloth packing ring group 4 are both formed by stacking a number of V-shaped cloth sealing rings 5, the first metal sealing ring 6 is arranged between the second braided packing 2 and the first V-shaped cloth packing ring group 3, and the second metal sealing ring 7 is arranged between the first V-shaped cloth packing ring group 3 and the second V-shaped cloth packing ring group 4. The two metal sealing rings in this example are both made of stainless steel. The V-shaped cloth sealing ring 5 is molded from butyl rubber and aramid fiber. Specifically, the first braided packing 1 is a packing woven from polytetrafluoroethylene fibers, and the strength of the polytetrafluoroethylene fibers used is selected to be 18.5 cN / dtex; the second braided packing 2 is a packing woven from polytetrafluoroethylene fibers and tetragonal aramid fibers, and the strength of the polytetrafluoroethylene fibers used is also selected to be 18.5 cN / dtex. The first metal sealing ring 6 and the second metal sealing ring 7 are provided with a channel 9 that passes through the interior in the vertical direction, and the coolant can flow through the channel 9. The specific components of the coolant can be selected and assembled from conventional components by those skilled in the art as needed.

[0026] See also Figure 2 As shown, the cross section of the V-shaped cloth-inserted sealing ring 5 is V-shaped, and the bottom end of the opening of the V-shaped cloth-inserted sealing ring 5 is provided with a retreat groove 8. The opening angle of the V-shaped cloth-inserted sealing ring 5 is 90 degrees.

[0027] The rest is the same as in Example 1.

[0028] Example 3

[0029] Embodiment 3 provides another combined sealing packing for dryers. Figure 1 As shown, the combined sealing packing for the dryer in this example includes, from the inside to the outside, a first braided packing 1, a second braided packing 2, a first metal sealing ring 6, a first V-shaped cloth packing ring group 3, a second metal sealing ring 7, and a second V-shaped cloth packing ring group 4. The first braided packing 1 and the second braided packing 2 are arranged in close proximity, the first V-shaped cloth packing ring group 3 and the second V-shaped cloth packing ring group 4 are both formed by stacking a number of V-shaped cloth sealing rings 5, the first metal sealing ring 6 is arranged between the second braided packing 2 and the first V-shaped cloth packing ring group 3, and the second metal sealing ring 7 is arranged between the first V-shaped cloth packing ring group 3 and the second V-shaped cloth packing ring group 4. The two metal sealing rings in this example are both made of stainless steel. The V-shaped cloth sealing ring 5 is molded from fluororubber and aramid fiber. Specifically, the first braided packing 1 is a packing woven from polytetrafluoroethylene fibers, and the strength of the polytetrafluoroethylene fibers used is 18 cN / dtex; the second braided packing 2 is a packing woven from polytetrafluoroethylene fibers and tetragonal aramid fibers, and the strength of the polytetrafluoroethylene fibers used is 18.5 cN / dtex. The first metal sealing ring 6 and the second metal sealing ring 7 are provided with a channel 9 that passes through the interior in the vertical direction, and the coolant can flow through the channel 9. The specific components of the coolant can be selected and assembled from conventional components by those skilled in the art as needed.

[0030] See also Figure 2 As shown, the cross section of the V-shaped cloth-inserted sealing ring 5 is V-shaped, and the bottom end of the opening of the V-shaped cloth-inserted sealing ring 5 is provided with a retreat groove 8. The opening angle of the V-shaped cloth-inserted sealing ring 5 is 90 degrees.

[0031] The rest is the same as in Example 1.

[0032] Example 4

[0033] Embodiment 4 provides another combined sealing packing for dryers. Figure 1As shown, the combined sealing packing for the dryer in this example includes, from the inside to the outside, a first braided packing 1, a second braided packing 2, a first metal sealing ring 6, a first V-shaped cloth packing ring group 3, a second metal sealing ring 7, and a second V-shaped cloth packing ring group 4. The first braided packing 1 and the second braided packing 2 are arranged in close proximity, the first V-shaped cloth packing ring group 3 and the second V-shaped cloth packing ring group 4 are both formed by stacking a number of V-shaped cloth sealing rings 5, the first metal sealing ring 6 is arranged between the second braided packing 2 and the first V-shaped cloth packing ring group 3, and the second metal sealing ring 7 is arranged between the first V-shaped cloth packing ring group 3 and the second V-shaped cloth packing ring group 4. The two metal sealing rings in this example are both made of stainless steel. The V-shaped cloth sealing ring 5 is molded from fluororubber and aramid fiber. Specifically, the first braided packing 1 is a packing woven from polytetrafluoroethylene fibers, and the strength of the polytetrafluoroethylene fibers used is 17.8 cN / dtex; the second braided packing 2 is a packing woven from polytetrafluoroethylene fibers and tetragonal aramid fibers, and the strength of the polytetrafluoroethylene fibers used is 18.2 cN / dtex. The first metal sealing ring 6 and the second metal sealing ring 7 are provided with a channel 9 that penetrates the interior in the vertical direction, and the coolant can flow through the channel 9. The specific components of the coolant can be selected and assembled from conventional components by those skilled in the art as needed.

[0034] See also Figure 2 As shown, the cross section of the V-shaped cloth-inserted sealing ring 5 is V-shaped, and the bottom end of the opening of the V-shaped cloth-inserted sealing ring 5 is provided with a retreat groove 8. The opening angle of the V-shaped cloth-inserted sealing ring 5 is 90 degrees.

[0035] The rest is the same as in Example 1.

[0036] Embodiment 5: This embodiment provides a special combined sealing packing for dryers, which includes, from inside to outside, a first braided packing, a second braided packing, a first metal sealing ring, a first V-shaped cloth packing ring group, a second metal sealing ring and a second V-shaped cloth packing ring group. The first braided packing and the second braided packing are arranged in close proximity, the first V-shaped cloth packing ring group and the second V-shaped cloth packing ring group are both formed by stacking a number of V-shaped cloth sealing rings, the first metal sealing ring is arranged between the second braided packing and the first V-shaped cloth packing ring group, the second metal sealing ring is arranged between the first V-shaped cloth packing ring group and the second V-shaped cloth packing ring group, the V-shaped cloth sealing ring is molded from fluororubber or butyl rubber and aramid fiber, and the first metal sealing ring and the second metal sealing ring are provided with channels for coolant to pass through. The design of this special combined sealing packing for dryers effectively solves the sealing problem of traditional dryers when handling high temperature, high pressure and highly corrosive gases. This combined sealing packing combines the advantages of braided packing and metal sealing rings, which not only ensures the stability and durability of the packing, but also improves its sealing performance.

[0037] The fitting arrangement of the first braided packing and the second braided packing increases the packing's flexibility and wear resistance, allowing it to remain stable under fluctuations in pressure and temperature inside the dryer. The stacking design of the first V-shaped cloth packing ring group and the second V-shaped cloth packing ring group provides a tighter sealing effect, effectively preventing gas leakage.

[0038] The provision of the first metal sealing ring and the second metal sealing ring further enhances the sealing performance of the packing, and channels for the passage of coolant are provided inside them, which can effectively prevent damage caused by thermal stress generated by the packing at high temperature while ensuring the sealing performance.

[0039] The V-type cloth sealing ring is molded from fluororubber or butyl rubber and aramid fiber. It has excellent corrosion resistance and high elasticity, and can maintain good sealing performance in various harsh environments.

[0040] In general, the design of this special combined sealing packing for dryers cleverly combines a variety of materials and technologies to provide an efficient, reliable and durable sealing solution for dryers, especially for dryers that handle high temperature, high pressure and highly corrosive gases. The advantage of this structure is that it can provide good sealing performance while adapting to the high temperature, high pressure and highly corrosive working environment of the dryer.

[0041] The first braided packing and the second braided packing are arranged in close contact, which can enhance the strength and durability of the packing. The first V-shaped cloth packing ring group and the second V-shaped cloth packing ring group are both stacked by a number of V-shaped cloth sealing rings. This design can increase the sealing effect of the packing while adapting to the axial and radial movement of the dryer. The first braided packing is a packing woven from polytetrafluoroethylene fibers. This packing has excellent wear resistance and chemical stability, and can effectively prevent leakage and contamination. Due to its high strength and flexibility, it can operate under high pressure and high temperature, and is suitable for various types of valves and pumps. In addition, its low friction coefficient makes the operation of rotating and moving parts smoother and prolongs the service life of the equipment. The braiding process of polytetrafluoroethylene fibers also makes the packing have good compressibility and resilience, and can maintain stable performance under various operating conditions. This packing has excellent high wear resistance and chemical stability, and can effectively prevent the erosion of various chemical substances. Its excellent high temperature resistance also enables it to maintain stable performance in high temperature environments. The braiding process of polytetrafluoroethylene fibers gives it extremely high strength and flexibility, which can adapt to various complex equipment structures and operating environments. The shape and size of the packing can be customized as needed to meet various types of sealing requirements. This packing is an ideal choice for various industrial applications, especially in high temperature, high pressure, and corrosive environments, where it can provide durable and reliable sealing protection.

[0042] A first metal sealing ring is provided between the second braided packing and the first V-shaped cloth packing ring group, which is to further improve the sealing effect and prevent leakage. A second metal sealing ring is provided between the first V-shaped cloth packing ring group and the second V-shaped cloth packing ring group, which is also to further prevent leakage. The second braided packing is a packing braided with polytetrafluoroethylene fiber and tetragonal aramid. This packing has excellent high wear resistance and chemical stability, and can effectively prevent corrosion from various chemical substances. Its excellent high temperature resistance also enables it to maintain stable performance in high temperature environments. The braiding process of polytetrafluoroethylene fiber gives it extremely high strength and flexibility, which can adapt to various complex equipment structures and operating environments. The shape and size of the packing can be customized as needed to meet various types of sealing requirements. This packing combines the wear resistance of polytetrafluoroethylene fiber and the strength and high temperature resistance of tetragonal aramid, and has extremely high comprehensive performance. Its unique braided structure enables it to have good flexibility while maintaining strength, and can adapt to various complex equipment structures and operating environments. In addition, this packing also has excellent chemical stability and corrosion resistance, and can maintain stable performance in various chemical environments. The shape and size of the packing can be customized to meet various types of sealing requirements. This packing is an ideal choice for various harsh industrial applications, especially in high temperature, high pressure and corrosive environments, where it can provide durable and reliable sealing protection. The strength of the PTFE fiber is 17.7-18.5cN / dtex.

[0043] The hole penetrates the first metal sealing ring and the second metal sealing ring in the axial direction. The hole penetrates the first metal sealing ring and the second metal sealing ring in the axial direction, thereby forming a through hole in the axial direction. The purpose of this design is to ensure that the two metal sealing rings can be consistent in the axial direction during the operation of the equipment. Such a structure also helps to improve the sealing performance of the equipment and prevent any possible leakage. In addition, this design can also help reduce the friction of the equipment during operation, improve the efficiency and life of the equipment. At the same time, the design of the hole can also be adjusted according to actual needs to adapt to equipment of different sizes and specifications. This design is not only simple in structure, but also has stable and reliable performance, and can be widely used in various equipment that requires sealing. The through hole can be used in various applications, such as as a channel for process fluids, or as a connecting channel between mechanical parts. By penetrating the first metal sealing ring and the second metal sealing ring in the axial direction, it can be ensured that the axial direction is penetrated while maintaining the sealing performance. This structure is suitable for various occasions requiring sealing and diversion, especially in high-precision, high-pressure or highly corrosive environments, and it can provide a stable and reliable fluid transmission or connection method.

[0044] The V-shaped cloth seal ring is molded from fluororubber or butyl rubber and aramid fiber. This material has excellent corrosion resistance and high temperature performance and can adapt to the working environment of the dryer. The first metal seal ring and the second metal seal ring are provided with channels for the coolant to pass through, which can effectively reduce the temperature of the seal ring and prevent it from deformation or damage due to overheating.

[0045] The cross section of the V-shaped cloth sealing ring is V-shaped or similar to V-shaped, and a concession groove is provided at the bottom end of the opening of the V-shaped cloth sealing ring. This design can effectively reduce friction and wear during use and increase the service life of the sealing ring. At the same time, the setting of the concession groove can prevent the sealing ring from breaking under high pressure or impact, and improve the reliability and stability of the seal. The design of the V-shaped cloth sealing ring is suitable for various sealing occasions with rotating or reciprocating motion, such as pumps, valves, hydraulic cylinders and other equipment. Its unique V-shaped structure and the design of the concession groove enable it to maintain good sealing performance and stability under various harsh working environments. This design can enable the opening of the sealing ring to better adapt to various shapes of sealing surfaces during use, thereby improving the sealing effect. At the same time, the setting of the concession groove can effectively reduce the pressure resistance of the sealing ring when it is under pressure, making it more stable and reliable during operation. This design also takes into account the convenience of installation, and the sealing ring can be installed on the equipment through simple operation. The V-shaped cloth sealing ring can be used in some high-pressure, high-temperature, and corrosive environments, and it can provide long-lasting and reliable sealing protection. The opening angle of the V-shaped cloth sealing ring is 90 degrees. Here, the opening angle of the V-shaped cloth-reinforced sealing ring is not limited to 90 degrees, and can be 75-120 degrees, as long as the composite mechanical properties are met.

[0046] according to Figure 1 , four parts fixed on the base, they are the first braided packing 1, the second braided packing 2, the first V-type cloth packing ring group 3 and the second V-type cloth packing ring group 4. These parts are fixed to the base by various means, such as bolts, welding or other connection methods to ensure the stability and reliability of the entire mechanism. The V-type cloth sealing ring 5, the first metal sealing ring 6 and the second metal sealing ring 7 are respectively connected to the parts fixed on the base through cams, which are curved parts that can provide linear motion in rotational motion. When these cams rotate, they push or pull the parts connected to them to achieve certain specific movements or functions. The concession groove 8 and the channel 9 are connected to the parts fixed on the base through a pin. A pin is a shaft with a cylindrical cross-section, which is usually used to transmit torque or as a positioning reference. Of the two parts, one may be used to transmit torque, while the other may be used to position or limit movement in a certain direction.

[0047] according to Figure 2The structure and working principle of the V-type cloth-clamped sealing ring are relatively simple. Generally speaking, it is made of rubber and is placed in a V-shaped groove. When the two contact surfaces move relative to each other, the V-type cloth-clamped sealing ring will be squeezed, so that it fits tightly with both sides of the groove, thus forming a tight seal. Due to its good elasticity and wear resistance, it can maintain a good sealing effect. The function of the concession groove is to provide a certain buffer space when the seal is subjected to pressure or stretching. When the seal is subjected to external loads or pressure, the concession groove can allow it to deform or move slightly, thereby protecting the seal from damage. At the same time, the design of the concession groove can also extend the service life of the seal. This design takes into account various factors in actual application scenarios, such as temperature changes, pressure fluctuations, and material aging.

Claims

1. A combined sealing packing for a dryer, characterized in that: From the inside to the outside, it includes a first braided packing, a second braided packing, a first metal sealing ring, a first V-shaped cloth packing ring group, a second metal sealing ring and a second V-shaped cloth packing ring group. The first braided packing and the second braided packing are arranged in close proximity. The first V-shaped cloth packing ring group and the second V-shaped cloth packing ring group are both formed by stacking a number of V-shaped cloth sealing rings. The first metal sealing ring is arranged between the second braided packing and the first V-shaped cloth packing ring group. The second metal sealing ring is arranged between the first V-shaped cloth packing ring group and the second V-shaped cloth packing ring group. The first metal sealing ring and the second metal sealing ring are provided with channels for coolant to pass through.

2. The combined sealing packing for dryer according to claim 1 is characterized in that: The first braided packing is a packing braided from polytetrafluoroethylene fibers.

3. The combined sealing packing for dryer according to claim 2 is characterized in that: The strength of the polytetrafluoroethylene fiber is selected to be 17.7-18.5 cN / dtex.

4. The combined sealing packing for dryer according to claim 1 is characterized in that: The second braided packing is a packing braided with polytetrafluoroethylene fiber and quadrangular aramid.

5. The combined sealing packing for dryer according to claim 4 is characterized in that: The strength of the polytetrafluoroethylene fiber is selected to be 17.7-18.5 cN / dtex.

6. The combined sealing packing for dryer according to claim 1, characterized in that: The hole passes through the first metal sealing ring and the second metal sealing ring in the axial direction.

7. A combined sealing packing for a dryer according to any one of claims 1 to 6, characterized in that: The cross section of the V-shaped cloth-inserted sealing ring is V-shaped, and a retreat groove is arranged at the bottom end of the opening of the V-shaped cloth-inserted sealing ring.

8. The combined sealing packing for dryer according to claim 7, characterized in that: The opening angle of the V-shaped cloth-inserted sealing ring is 90 degrees.

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