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. According to the utility model, the unique three-channel design is adopted, and the effects of hot water pumping and cold water discharging by pumping compressed air can be simultaneously met by utilizing a single joint. 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] This utility model relates to the field of general papermaking equipment, and in particular to a high-speed rotary joint for a low-temperature drying cylinder. Background Technology

[0002] The drying cylinder is one of the core pieces of equipment in the papermaking production process. It typically consists of an array of multiple drying cylinders with a temperature gradient from high to low, generally ranging from 70 to 120 degrees Celsius. The heat source for the drying cylinder is steam.

[0003] However, this structural design suffers from significant heat source waste. The heat source for the high-temperature drying cylinder is typically superheated steam, and the condensate produced inside still reaches 80-90°C. This hot water is directly discharged and cannot be effectively recovered. In fact, this temperature range of hot water could be used as the heat transfer medium for the low-temperature drying cylinder. However, existing rotary joints generally suffer from 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 heat transfer medium entry and rapid cold water recovery. Currently, there is no corresponding solution to this problem. Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings of the existing technology and provide a high-speed rotary joint for a low-temperature drying cylinder that is simple in structure, easy to assemble, uses the existing drying cylinder shaft head as the assembly basis, and simultaneously meets the requirements of hot water inlet and rapid cold water recovery.

[0005] The equipment includes connectors and multi-functional integrated tubing assemblies;

[0006] The joint includes a flange connection; the flange connection is the assembly base of this equipment and is connected to the shaft head of the drying cylinder during use.

[0007] An annular bracket is fitted over the flange connection; the annular bracket is fixedly sealed to the bearing cover of the drying cylinder during use; the bearing cover referred to here is the support part for the rotation of the drying cylinder, which does not rotate during operation.

[0008] An elastic piston assembly is fixedly packaged in front of the annular bracket. The tail end face of the elastic piston assembly is fitted with the front of the flange connection, and a graphite ring is provided between the fitting surfaces.

[0009] A compressed air port is provided on the aforementioned elastic piston assembly;

[0010] The elastic piston assembly is provided with a pipe connection section at the front, and a second pipe interface is provided on the pipe connection section; a cap is provided at the front of the pipe connection section, and a first pipe interface is provided on the cap.

[0011] The aforementioned multi-functional integrated pipe assembly includes a compressed air pipe, a water spray pipe, and a return water pipe;

[0012] The compressed air pipeline is connected to the compressed air interface; the spray pipe and the return water pipe are a pipe-in-pipe structure, and the spray pipe and the return water pipe are respectively connected to the first pipe interface and the second pipe interface; and the return water pipe is provided with a siphon pipe section, which is recessed.

[0013] The effect achieved is that, based on the encapsulation of the annular bracket and flange, the flange rotates along with the drying cylinder when it rotates; and based on the sealed connection of the flange, graphite ring and elastic piston assembly, 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 water spray pipe and the return water pipe do not rotate.

[0014] Hot water, i.e., the condensate discharged from the high-temperature drying cylinder, can be sprayed into the low-temperature drying cylinder by a water pump through a spray pipe; and based on the configuration of the compressed air interface, compressed air is pumped into the drying cylinder, and the siphon pipe installed at the bottom of the drying cylinder draws the cold water at the bottom of the drying cylinder into the return water pipe, and then discharges it through its pipe interface.

[0015] The beneficial effects of this utility model are as follows: This utility model fills a gap in the existing technology, achieving a unique three-channel design in the field of rotary joints. It can simultaneously meet the needs of hot water pumping and cold water discharge using a single joint. In particular, the double flange design allows for a wider range of applications, adapting to various shaft head specifications. Furthermore, the equipment is easy to install. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a high-speed rotary joint for a low-temperature drying cylinder according to the present invention;

[0017] Figure 2 Based on Figure 1 A partial sectional view;

[0018] Figure 3 This is a schematic diagram of the elastic piston assembly;

[0019] Figure 4 Based on Figure 1 The direction, the assembly structure diagram of the multi-functional integrated tube assembly, is also the implementation principle diagram of this utility model;

[0020] Figure label:

[0021] 1-Elastic piston assembly, 2-Pipe connection section, 3-Annular bracket, 4-Transition flange, 5-Spherical flange, 6-Graphite ring, 7-Cap, 8-Reducing elbow, 9-Return pipe, 10-Assembled pipe section, 11-Spray pipe section, 12-Siphon pipe section, 13-Spray head, 14-Locking lock nut, 15-Stainless steel inner liner

[0022] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0023] Reference Figure 1 , Figure 2 , Figure 3 and Figure 4 The present invention provides a high-speed rotary joint for a low-temperature drying cylinder, comprising a joint portion and a multi-functional integrated tube assembly.

[0024] The joint includes a flange connection; the flange connection is the assembly base of this equipment and is connected to the shaft head of the drying cylinder during use.

[0025] An annular bracket 3 is fitted over the flange connection; the annular bracket 3 is fixedly sealed to the bearing cover of the drying cylinder during use; the bearing cover referred to here is the support part for the rotation of the drying cylinder, which does not rotate during operation.

[0026] An elastic piston assembly 1 is fixedly packaged in front of the annular bracket 3. The tail end face of the elastic piston assembly 1 is fitted with the front of the flange connection, and a graphite ring 6 is provided between the fitting surfaces.

[0027] A compressed air port is provided on the elastic piston assembly 1;

[0028] The elastic piston assembly 1 is provided with a pipe connection section 2 at the front, and a second pipe interface is provided on the pipe connection section 2; a cover 7 is provided at the front of the pipe connection section 2, and a first pipe interface is provided on the cover 7.

[0029] The multi-functional integrated pipe assembly includes a compressed air pipe, a water spray pipe, and a return water pipe 9;

[0030] The compressed air pipeline is connected to the compressed air interface; the spray pipe and return water pipe 9 are pipe-in-pipe structures, and the spray pipe and return water pipe 9 are respectively connected to the first pipe interface and the second pipe interface; and the return water pipe 9 is provided with a siphon pipe section 12, which is recessed.

[0031] Preferably, the siphon pipe section 12 is vertically arranged on the return water pipe 9.

[0032] The effect achieved is that, based on the encapsulation of the annular bracket 3 and the flange, the flange rotates when the drying cylinder rotates; and based on the sealed connection of the flange, graphite ring 6 and 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 return water pipe 9 do not rotate.

[0033] Hot water, i.e., the condensate discharged from the high-temperature drying cylinder, can be sprayed into the low-temperature drying cylinder by a water pump through a spray pipe; and based on the configuration of the compressed air interface, compressed air is pumped into the drying cylinder, and the siphon pipe installed at the bottom of the drying cylinder draws the cold water at the bottom of the drying cylinder into the return water pipe 9, and then discharges it through its pipe interface.

[0034] Example 1: The flange connection includes a transition flange 4 and a spherical flange 5;

[0035] The transition flange 4 is adapted to the shaft head of the drying cylinder and is available in various specifications; its front is adapted to the rear of the spherical flange 5.

[0036] The effect achieved is that, based on the various sizes and specifications of the drying cylinder shaft head in commercially available products, the double flange configuration can make the equipment more widely applicable; that is, by simply configuring the transition flange 4 with various specifications to match the various specifications of shaft heads, the other components can be produced and assembled in a uniform specification and applied to drying cylinders with shaft heads of different diameters.

[0037] In Example 2, the elastic piston assembly 1 includes a sleeve and a piston, which are elastically encapsulated by a spring. A stainless steel inner liner 15 is provided on the inner surface of the sleeve. The length of the stainless steel inner liner 15 covers the active stroke of the piston. A mechanical seal is also provided between the piston and the stainless steel inner liner 15.

[0038] This achieves a different effect from the existing elastic piston assembly 1, which is prone to corrosion between the piston and the sleeve after long-term operation, causing the piston to be unable to press against the graphite ring 6 and resulting in sealing failure. This also extends the service life of the equipment.

[0039] Furthermore, a pipe assembly sleeve is also provided inside the plug sleeve. The pipe assembly sleeve has an annular structure, and its central annular opening is used for the passage of a water spray pipe or a return water pipe 9.

[0040] Multiple waist-shaped air holes are also evenly arrayed on the tube jacket.

[0041] The effect achieved is that the pipe clamp constrains and supports the pipe assembly, and the waist-shaped air hole is used to pass compressed air.

[0042] In Example 3, the pipe connection section 2 is a sight glass.

[0043] The sight glass mentioned here refers to the pipe sight glass assembly in the prior art, which enables observation of the internal conditions of the pipe.

[0044] In Example 4, the return water pipe 9 and the second pipe interface are connected by a locking nut 14.

[0045] The water spray pipe is installed through the return water pipe 9. The water spray pipe includes an assembly pipe section 10 installed in the return water pipe 9 and a spray pipe section 11 integrally connected to the tail end of the assembly pipe section 10.

[0046] The assembly pipe section 10 is connected to the first pipe interface pipe via a locking nut 14;

[0047] Spray nozzles 13 are also arranged in an array on the spray pipe section 11.

[0048] The effect achieved is to optimize the pipeline configuration and ensure smooth water intake and return.

[0049] Furthermore, a reducing elbow 8 is also provided on the first pipe interface.

[0050] The effect achieved is to ensure smooth return and drainage.

[0051] Furthermore, the nozzle 13 is a spiral nozzle.

[0052] The effect achieved is to improve the uniformity of the spraying effect and avoid large temperature differences in the drying cylinder.

[0053] During assembly, this utility model is as follows:

[0054] Step 1: Install the transition flange 4 and the transition flange gasket onto the drying cylinder shaft head and tighten the mounting bolts;

[0055] Step 2: Install the spherical flange 5 and the spherical flange gasket onto the transition flange 4 and tighten the mounting bolts;

[0056] Step 3: Install the annular bracket 3 onto the bearing cover and tighten the mounting bolts;

[0057] Step 4: Pass the return water pipe 9 out from inside the drying cylinder;

[0058] Step 5: Insert the graphite ring 6 into the return water pipe 9 and place it close to the spherical flange 5, making sure that the spherical surface of the graphite ring 6 faces the drying cylinder shaft head;

[0059] Step 6: Install the elastic piston assembly 1 onto the annular bracket 3 and tighten the mounting bolts. During installation, ensure that the spherical surface of the graphite ring 6 fits against the spherical surface of the spherical flange 5. Tighten the mounting bolts diagonally around the circumference to ensure that the graphite ring 6 is evenly stressed. The connection port of the elastic piston assembly 1 should face the 6 o'clock direction.

[0060] Step 7: Push the return water pipe 9 out of the piston assembly inside the drying cylinder. 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.

[0061] Step 8: Install the return water pipe 9 to the threaded part of the second pipe interface using the locking nut 14 and tighten it;

[0062] Step 9: Tighten the anti-reverse locking bolt on the anti-reverse locking nut 14 of the return water pipe 9;

[0063] Step 10: Install pipe connection section 2 to the piston assembly and tighten the mounting bolts, making sure the connection port faces the 6 o'clock position;

[0064] Step 11: Inside the drying cylinder, insert the assembly pipe section 10 through the pipe connection section 2, with the assembly pipe section 10 threaded out of the pipe connection section 2;

[0065] Step 12: Adjust the position of the positioning pin hole of assembly pipe section 10 and insert the positioning pin;

[0066] Step 13: Tighten the stop lock nut 14 and tighten the anti-reverse locking bolt on the stop lock nut 14;

[0067] Step 14: Install the cap 7 to the pipe connection section 2 and tighten the mounting bolts;

[0068] Step 15: Wrap Teflon tape around the external threads of the cap 7;

[0069] Step 16: Install the reducing elbow 8 onto the cover 7 and tighten it;

[0070] Step 17: Install an O-ring at point 12 of the siphon tube;

[0071] Step 18: Install the siphon tube section 12 into the drying cylinder, attach it to the connecting flange, and tighten the mounting bolts. Note that the suction port of the siphon tube section 12 should face the 6 o'clock direction.

[0072] Step 19: Wrap PTFE tape around the external thread of the nozzle 13 and install it to the threaded connection of the spray pipe section 11 and tighten it.

[0073] Step 20: Wrap Teflon tape around the external thread of the spray pipe section 11 and install it to the rear thread of the siphon pipe section 12. Tighten it while tightening, paying attention to adjusting the direction so that the nozzle 13 is facing the 12 o'clock direction.

[0074] The working principle of this utility model is:

[0075] This equipment is specifically designed for use in the low-temperature drying cylinder of the drying section. It can utilize the recycled water from the high-temperature drying cylinder as a heat medium to heat the drying cylinder. The joint is based on the sealing of the annular bracket 3 and the flange. When the drying cylinder rotates, the flange rotates with it. Furthermore, based on the connection between the flange, the graphite ring 6, and the elastic piston assembly 1, while ensuring overall sealing, the compressed air interface, the first pipe interface, and the second pipe interface do not rotate, that is, the components in their respective positions do not rotate; and the water spray pipe and the return water pipe 9 do not rotate.

[0076] Hot water, i.e., the condensate discharged from the high-temperature drying cylinder, can be sprayed into the low-temperature drying cylinder by a water pump through a spray pipe; and based on the configuration of the compressed air interface, compressed air is pumped into the drying cylinder, and the siphon pipe installed at the bottom of the drying cylinder draws the cold water at the bottom of the drying cylinder into the return water pipe 9, and then discharges it through its pipe interface.

[0077] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0078] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider 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 drying cylinder, comprising a joint portion and a multi-functional integrated pipe assembly; the joint portion includes a flange connection portion, and an annular support is fitted over the flange connection portion, characterized in that: An elastic piston assembly is fixedly packaged in front of the annular bracket. The tail end face of the elastic piston assembly is fitted with the front of the flange connection, and a graphite ring is provided between the fitting surfaces. A compressed air port is provided on the aforementioned elastic piston assembly; The elastic piston assembly is provided with a pipe connection section at the front, and a second pipe interface is provided on the pipe connection section; a cap is provided at the front of the pipe connection section, and a first pipe interface is provided on the cap. The aforementioned multi-functional integrated pipe assembly includes a compressed air pipe, a water spray pipe, and a return water pipe; The compressed air pipeline is connected to the compressed air interface; the spray pipe and the return water pipe are a pipe-in-pipe structure, and the spray pipe and the return water pipe are respectively connected to the first pipe interface and the second pipe interface; and the return water pipe is provided with a siphon pipe section, which is recessed.

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

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

4. A high-speed rotary joint for a low-temperature drying cylinder according to claim 3, characterized in that, The plug sleeve is also provided with a pipe assembly jacket, which is a ring structure with its central ring opening for passing through a spray pipe or a return pipe. Multiple waist-shaped air holes are also evenly arrayed on the tube jacket.

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

6. A high-speed rotary joint for a low-temperature drying cylinder according to claim 1, characterized in that, The return water pipe and the second pipe interface are connected by a locking nut. The water spray pipe is installed through the return water pipe, and the water spray pipe includes an assembly pipe section installed inside the return water pipe and a spray pipe section integrally connected to the end of the assembly pipe section. The assembly pipe section is connected to the first pipe interface pipe via a locking nut; Spray nozzles are also arranged in an array on the spray pipe section.

7. A high-speed rotary joint for a low-temperature drying cylinder according to claim 6, characterized in that, The nozzle is a spiral nozzle.

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

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