High-speed rotating joint for low-temperature section drying cylinder

Abstract

A high-speed rotating joint for a low-temperature section drying cylinder comprises a flange connecting part, an annular support is arranged outside the flange connecting part in a sleeving mode, an elastic piston assembly is arranged in front of the annular support, and the elastic piston assembly and the flange connecting part are mechanically sealed; the elastic piston assembly is provided with a compressed air interface; a pipeline connecting section is arranged in front of the elastic piston assembly, and a second pipeline connector is arranged on the pipeline connecting section. A first pipeline connector is arranged in front of the pipeline connecting section; the compressed air pipeline is connected with the compressed air interface; the water spraying pipe and the water return pipe are of a pipe-in-pipe structure and are connected with the first pipeline connector and the second pipeline connector correspondingly. And a siphon section is arranged on the water return pipe. By means of the unique three-channel design, the effects that hot water is pumped in and cold water is discharged through pumped-in compressed air can be achieved at the same time through the single connector. Particularly, due to the double-flange design, the application range of the device is wider, the device is suitable for various shaft head specifications, and low-cost modification of an existing device is achieved.

Description

Technical Field

[0001] The present invention relates to the field of general papermaking equipment, and particularly to a high-speed rotary joint for a low-temperature drying cylinder. Background Art

[0002] The drying cylinder is one of the core equipment in the papermaking production section. Generally, there are multiple drying cylinders arranged in an array, and the temperature is distributed in a gradient from high to low, and the temperature range involved is generally between 120°C and 70°C. The heat source of the drying cylinder is steam.

[0003] However, this structural form has significant heat source waste. That is, the heat source of the high-temperature drying cylinder is generally superheated steam, and the condensate water generated in the drying cylinder still has a temperature of 80 - 90°C. This part of the hot water is directly discharged and cannot be effectively recovered. In fact, the hot water in this temperature range can completely be used as the heat medium for the low-temperature drying cylinder. However, the rotary joints in the prior art generally have the disadvantages of a single structural form and low functional integration. That is, based on the existing drying cylinder, a single joint cannot simultaneously meet the functions of the heat medium entering and the cold water being quickly recovered. For this problem, there is currently no corresponding solution. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a high-speed rotary joint for a low-temperature drying cylinder that is simple in structure, convenient to assemble, based on the existing drying cylinder shaft head, and can simultaneously meet the entry of hot water and the quick recovery of cold water.

[0005] The device includes a joint part and a multi-functional integrated pipe group; The joint part includes a flange connection part; the flange connection part is the assembly basis of this device and is hermetically connected to the shaft head of the drying cylinder during use; An annular bracket is sleeved outside the flange connection part; the annular bracket is hermetically fixed to the bearing cover of the drying cylinder during use; the bearing cover mentioned here refers to the support part of the drying cylinder rotation and does not rotate during operation; An elastic piston assembly is hermetically fixed in front of the annular bracket. The end face of the tail end of the elastic piston assembly is attached to the front of the flange connection part, and a graphite ring is arranged between the attachment surfaces; An air pressure interface is arranged on the elastic piston assembly; A pipe connection section is arranged in front of the elastic piston assembly, and a second pipe interface is arranged on the pipe connection section; a cover is arranged in front of the pipe connection section, and a first pipe interface is arranged on the cover; The multi-functional integrated pipe group includes a compressed air pipe, a water spraying pipe, and a water return pipe; The described air pressure pipeline is connected to the air pressure interface; the water spraying pipe and the water return pipe are of a pipe-in-pipe structure, and the water spraying pipe and the water return pipe are respectively connected to the first pipeline interface and the second pipeline interface; and a siphon pipe section is arranged on the water return pipe, and the siphon pipe section is arranged in a sunken manner.

[0006] The achieved effect is that based on the encapsulation of the joint head by the annular bracket and the flange, when the dryer cylinder rotates, the flange rotates along with it; and based on the sealed connection of the flange, the graphite ring and the elastic piston assembly, while ensuring the overall sealing performance, the air pressure interface, the first pipeline interface and the second pipeline interface do not rotate, that is, the components at their positions do not rotate; and the water spraying pipe and the water return pipe do not rotate. Hot water, that is, the condensed water discharged from the high-temperature dryer cylinder, can be sprayed into the low-temperature dryer cylinder through the water spraying pipe by using a water pump; and based on the setting of the air pressure interface, air pressure is pumped into the dryer cylinder, and the siphon pipe section arranged in a sunken manner sucks the cold water at the bottom of the dryer cylinder into the water return pipe and discharges it through its pipeline interface.

[0007] The beneficial effects of the present invention are as follows: The present invention fills a gap in the prior art, realizes a unique three-channel design in the field of rotary joints, and can use a single joint to simultaneously meet the effects of pumping in hot water and pumping in air pressure to discharge cold water. In particular, the double-flange design can make the application range of the equipment wider and adapt to various shaft head specifications. And the equipment is convenient to install. Description of the Drawings

[0008] Figure 1 is a schematic structural diagram of a high-speed rotary joint for a low-temperature section dryer cylinder according to the present invention; Figure 2 is based on Figure 1 partial sectional view; Figure 3 is a schematic structural diagram of the elastic piston assembly; Figure 4 is based on Figure 1 direction, the assembly structural diagram of the multi-functional integrated pipe group, and is also the implementation principle diagram of the present invention; Reference Signs: 1 - elastic piston assembly, 2 - pipeline connection section, 3 - annular bracket, 4 - transition flange, 5 - spherical flange, 6 - graphite ring, 7 - cover, 8 - reducing elbow, 9 - water return pipe, 10 - assembly pipe section, 11 - spray pipe section, 12 - siphon pipe section, 13 - nozzle, 14 - stop locking nut, 15 - stainless steel inner lining [[ID=XXX]]The realization, functional features and advantages of the object of the present invention will be further described with reference to the embodiments and the drawings. Detailed Embodiments

[0009] Refer to Figure 1 、 Figure 2 、Figure 3 With Figure 4 , a high-speed rotary joint for a low-temperature section drying cylinder according to the present invention includes a joint head and a multi-functional integrated pipe group; The joint head includes a flange connection part; the flange connection part is the assembly basis of this equipment and is hermetically connected to the shaft head of the drying cylinder during use; An annular bracket 3 is sleeved outside the flange connection part; the annular bracket 3 is fixedly encapsulated with the bearing cover of the drying cylinder during use; the bearing cover mentioned here refers to the support part of the drying cylinder rotation and does not rotate during operation; An elastic piston assembly 1 is fixedly encapsulated in front of the annular bracket 3. The end face of the tail end of the elastic piston assembly 1 is attached to the front of the flange connection part, and a graphite ring 6 is arranged between the attachment surfaces; A compressed air interface is arranged on the elastic piston assembly 1; A pipe connection section 2 is arranged in front of the elastic piston assembly 1, and a second pipe interface is arranged on the pipe connection section 2; a cover 7 is arranged in front of the pipe connection section 2, and a first pipe interface is arranged on the cover 7; The multi-functional integrated pipe group includes a compressed air pipe, a water spray pipe and a water return pipe 9; The compressed air pipe is connected to the compressed air interface; the water spray pipe and the water return pipe 9 are of a pipe-in-pipe structure, and the water spray pipe and the water return pipe 9 are respectively connected to the first pipe interface and the second pipe interface; and a siphon section 12 is arranged on the water return pipe 9, and the siphon section 12 is arranged in a sunken manner.

[0010] Preferably, the siphon section 12 is vertically arranged on the water return pipe 9.

[0011] The achieved effect is that based on the encapsulation of the annular bracket 3 and the flange of the joint head, when the drying cylinder rotates, the flange rotates accordingly; and based on the sealed connection of the flange, the graphite ring 6 and the elastic piston assembly 1, while ensuring the overall sealing performance, the compressed air interface, the first pipe interface and the second pipe interface do not rotate, that is, the components at their positions do not rotate; and the water spray pipe and the water return pipe 9 do not rotate; Hot water, that is, the condensate discharged from the high-temperature drying cylinder, can be sprayed into the low-temperature drying cylinder through the water spray pipe by a water pump; and based on the setting of the compressed air interface, compressed air is pumped into the drying cylinder, and its sunken siphon sucks the cold water at the bottom of the drying cylinder into the water return pipe 9 and is discharged through its pipe interface.

[0012] Example 1, the flange connection part includes a transition flange 4 and a spherical flange 5; The back of the transition flange 4 is adapted to the shaft head of the drying cylinder and is provided with various specifications; its front is adapted to the back of the spherical flange 5.

[0013] The effect achieved thereby is that, since there are various size specifications for the dryer shaft heads in commercially available products, the setting of the double flanges enables the equipment to have a wider applicability; that is, only by configuring the transition flange 4 in multiple specifications to adapt to various specifications of shaft heads, the unified specification production and assembly of the remaining components can be achieved and applied to dryers with different shaft diameters and shaft heads.

[0014] Embodiment 2: The elastic piston assembly 1 includes a plug sleeve and a piston. The plug sleeve and the piston are elastically encapsulated by a spring, and a stainless steel inner lining sleeve 15 is provided on the inner surface of the plug sleeve. The length of the stainless steel inner lining sleeve 15 covers the movement stroke of the piston, and a mechanical seal is also provided between the piston and the stainless steel inner lining sleeve 15.

[0015] The effect achieved thereby is different from the elastic piston assembly 1 in the prior art. After long-term operation, rust is likely to occur between the piston and the plug sleeve, resulting in the piston being unable to press against the graphite ring 6 and causing problems such as seal failure. And thereby, the service life of the equipment is longer.

[0016] Furthermore, a pipe group jacket is also provided in the plug sleeve. The pipe group jacket is of an annular structure, and the central annular opening thereof is used for passing a water spray pipe or a water return pipe 9; A plurality of kidney-shaped air holes are evenly arranged in an array on the pipe group jacket.

[0017] The effect achieved thereby is that the pipe group jacket restricts and supports the pipe group, and the kidney-shaped air holes are used for passing compressed air.

[0018] Embodiment 3: The pipeline connection section 2 is a sight glass.

[0019] The sight glass mentioned here is the pipeline sight glass assembly in the prior art. The effect achieved thereby is that the internal situation of the pipeline can be observed.

[0020] Embodiment 4: The water return pipe 9 and the second pipeline interface are connected by a pipeline through a stop locking nut 14; The water spray pipe passes through the water return pipe 9. The water spray pipe includes an assembly pipe section 10 provided in the water return pipe 9 and a spray pipe section 11 integrally connected to the tail end of the assembly pipe section 10; The assembly pipe section 10 is connected to the first pipeline interface by a pipeline through a stop locking nut 14; Nozzles 13 are also arranged in an array on the spray pipe section 11.

[0021] The effect achieved thereby is to optimize the pipeline configuration and enable smooth inlet and return water.

[0022] Furthermore, a reducing elbow 8 is also provided on the first pipeline interface.

[0023] The effect achieved thereby is to make the return water drainage smooth.

[0024] Further, the spray head 13 is a spiral nozzle.

[0025] The effect achieved thereby is to improve the uniformity of the spraying effect and avoid large temperature differences in the dryer cylinder.

[0026] When the present invention is assembled: Step 1: Install the transition flange 4 and the transition flange gasket onto the dryer cylinder shaft head and tighten the installation bolts. Step 2: Install the spherical flange 5 and the spherical flange gasket onto the transition flange 4 and tighten the installation bolts. Step 3: Install the annular bracket 3 onto the bearing cover and tighten the installation bolts. Step 4: Pass the return water pipe 9 out from inside the dryer cylinder. Step 5: Insert the graphite ring 6 into the return water pipe 9 and place it close to the spherical flange 5, noting that the spherical surface of the graphite ring 6 faces the dryer cylinder shaft head. Step 6: Install the elastic piston assembly 1 onto the annular bracket 3 and tighten the installation bolts. When installing, note that the spherical surface of the graphite ring 6 fits with the spherical surface of the spherical flange 5. Tighten the installation bolts diagonally in a circle to ensure that the graphite ring 6 is evenly stressed, and the connection port of the elastic piston assembly 1 faces the 6 o'clock direction. Step 7: Push the return water pipe 9 out in the piston assembly inside the dryer cylinder. The threaded part of the return water pipe 9 extends out of the elastic piston assembly 1. Adjust the position of the positioning pin hole and insert the positioning pin. Step 8: Install the return water pipe 9 onto the threaded part of the second pipe interface using the stop locking nut 14 and tighten it. Step 9: Tighten the anti-loosening locking bolt on the stop locking nut 14 of the return water pipe 9. Step 10: Install the pipe connection section 2 onto the piston assembly and tighten the installation bolts, noting that the connection port faces the 6 o'clock direction. Step 11: Pass the assembly pipe section 10 out from inside the pipe connection section 2 inside the dryer cylinder. The threaded part of the assembly pipe section 10 extends out of the pipe connection section 2. Step 12: Adjust the position of the positioning pin hole of the assembly pipe section 10 and insert the positioning pin. Step 13: Tighten the stop locking nut 14 and tighten the anti-loosening locking bolt on the stop locking nut 14. Step 14: Install the cover 7 onto the pipe connection section 2 and tighten the installation bolts. Step 15: Wrap the raw material tape around the external thread of the cover 7. Step 16: Install the reducing elbow 8 onto the cover 7 and tighten it. Step 17: Install an O-ring at the siphon pipe section 12. Step 18: Install the siphon pipe section 12 at the connection flange of the siphon pipe section 12 in the drying cylinder and tighten the installation bolts. Note that the water suction port of the siphon pipe section 12 faces the 6 o'clock direction. Step 19: Wrap the external thread of the spray head 13 with raw tape and install it at the threaded connection of the spray pipe section 11 and tighten it. Step 20: Wrap the external thread of the spray pipe section 11 with raw tape and install it at the rear threaded part of the siphon pipe section 12 and tighten it. When tightening, pay attention to adjusting the direction so that the spray head 13 faces the 12 o'clock direction. The working principle of the present invention is as follows: This equipment is specifically used for the drying cylinders in the low-temperature section of the drying section. It can use the recycled water from the high-temperature section drying cylinders as the heat medium to heat the drying cylinders. Based on the encapsulation of the joint part on the annular bracket 3 and the flange, when the drying cylinder rotates, the flange rotates accordingly. And based on the connection of the flange, the graphite ring 6 and the elastic piston assembly 1, while ensuring the overall sealing performance, the compressed air interface, the first pipe interface and the second pipe interface do not rotate, that is, the components in their positions do not rotate; and the spray water pipe and the return water pipe 9 do not rotate. Hot water, that is, the condensate discharged from the high-temperature drying cylinder, can be sprayed into the low-temperature drying cylinder through the spray water pipe by using a water pump; and based on the setting of the compressed air interface, compressed air is pumped into the drying cylinder. The siphon pipe set at a lower position sucks the cold water at the bottom of the drying cylinder into the return water pipe 9 and discharges it through its pipe interface.

[0027] The above shows and describes the basic principles, main features and advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claims.

[0028] In addition, it should be understood that although this specification is described according to the embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A high-speed rotary joint for a low-temperature section drying cylinder, comprising a joint head and a multi-functional integrated pipe group; the joint head includes a flange connection part, and an annular bracket is sleeved outside the flange connection part, characterized in that: An elastic piston assembly is fixedly encapsulated in front of the annular bracket. The rear end face of the elastic piston assembly is in contact with the front of the flange connection part, and a graphite ring is arranged between the contact surfaces. An air compression interface is arranged on the elastic piston assembly. A pipe connection section is arranged in front of the elastic piston assembly, and a second pipe interface is arranged on the pipe connection section. A cover is arranged in front of the pipe connection section, and a first pipe interface is arranged on the cover. The multifunctional integrated pipe group includes an air compression pipe, a water spraying pipe and a water return pipe. The air compression pipe is connected to the air compression interface. The water spraying pipe and the water return pipe are of a pipe-in-pipe structure, and the water spraying pipe and the water return pipe are respectively connected to the first pipe interface and the second pipe interface. An siphon pipe section is arranged on the water return pipe, and the siphon pipe section is arranged in a sunken manner.

2. The high-speed rotary joint for a low-temperature section drying cylinder according to claim 1, characterized in that, The flange connection part includes a transition flange and a spherical flange. The rear of the transition flange is adapted to the shaft head of the dryer and is provided with various specifications. The front of the transition flange is adapted to the rear of the spherical flange.

3. The high-speed rotary joint for a low-temperature drying cylinder according to claim 1, wherein, The elastic piston assembly includes a plug sleeve and a piston. The plug sleeve and the piston are elastically encapsulated by a spring. A stainless steel inner sleeve is arranged on the inner surface of the plug sleeve. The length of the stainless steel inner sleeve covers the moving stroke of the piston, and a mechanical seal is also arranged between the piston and the stainless steel inner sleeve.

4. The high-speed rotary joint for a low-temperature drying cylinder according to claim 3, wherein, A pipe group jacket is also arranged in the plug sleeve. The pipe group jacket is of an annular structure, and the central annular opening is used for passing the water spraying pipe or the water return pipe. A plurality of kidney-shaped air holes are evenly arranged in an array on the pipe group jacket.

5. The high-speed rotary joint for a low-temperature drying cylinder according to claim 1, characterized in that, The pipe connection section is a sight glass.

6. The high-speed rotary joint for a low-temperature drying cylinder according to claim 1, characterized in that, The water return pipe and the second pipe interface are connected by a pipe through a stop lock nut. The water spraying pipe passes through the water return pipe. The water spraying pipe includes an assembly pipe section arranged in the water return pipe and a spraying pipe section integrally connected to the tail end of the assembly pipe section. The assembly pipe section is connected to the first pipe interface by a pipe through a stop lock nut. Spray heads are also arranged in an array on the spraying pipe section.

7. The high-speed rotary joint for a low-temperature section dryer cylinder according to claim 6, characterized in that The spray heads are spiral nozzles.

8. The high-speed rotary joint for a low-temperature section drying cylinder according to claim 1, characterized in that, A reducing elbow is also arranged on the first pipe interface.

Images