Condensate water discharging mechanism of papermaking drying cylinder

Abstract

The utility model relates to the technical field of papermaking drying cylinders, and discloses a papermaking drying cylinder condensate water discharging mechanism which comprises a cavity formed in a cylinder body and provided with an inclined face. One end of the water pumping pipe penetrates through the left support, and the other end of the water pumping pipe penetrates through and extends into the cavity; the water suction pump is arranged at the top of the bottom plate, and the top input end of the water suction pump is connected with the water suction pipe; the lower liquid level sensor is arranged on the inner side wall of the water pumping pipe, and a bottom probe of the lower liquid level sensor is flush with the bottom end of the dormitory discharging assembly. When the liquid level rises to a probe area of the lower liquid level sensor, an electric signal is triggered to change, the controller controls the water suction pump to start, the water suction pump pumps the condensate water in the cavity out of the cylinder body through the water suction pipe, and the normal heat transfer effect is prevented from being affected. When the liquid level in the water pumping pipe drops out of the sensing range of the lower liquid level sensor, the signal of the lower liquid level sensor is recovered, and the controller immediately sends an instruction to close the water pump to prevent steam from being pumped out.

Description

Technical Field

[0001] This utility model relates to the field of paper drying cylinder technology, specifically a condensate discharge mechanism for paper drying cylinders. Background Technology

[0002] Paper drying cylinders are key pieces of equipment in papermaking machinery, primarily used for paper drying. The working principle of a paper drying cylinder is based on heat transfer. During the papermaking process, the wet paper after pressing is transferred to the surface of the drying cylinder, where high-temperature, high-pressure steam is introduced. The heat from the steam is transferred to the paper surface through the cylinder walls, causing the moisture in the paper to evaporate rapidly. Simultaneously, the drying cylinder rotates at a certain speed, moving the paper across its surface to achieve continuous drying. The evaporated water vapor is exhausted through a ventilation system around the drying cylinder to maintain a suitable humidity level in the drying environment and promote the continuous drying process.

[0003] After the steam releases heat and condenses, it produces a large amount of condensate. Due to the centrifugal force caused by the rotation of the drying cylinder, this condensate adheres to the inner surface of the drying cylinder. When the angular velocity is high, it forms a water ring, which hinders the transfer of heat to the surface of the drying cylinder. Therefore, the condensate needs to be drained in time. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this utility model provides a condensate drainage mechanism for paper drying cylinders, which has the advantage of facilitating the discharge of condensate. It solves the problem that when paper drying cylinders release heat and condense, a large amount of condensate is generated, which adheres to the inner surface of the cylinder and affects heat transfer, thus requiring timely drainage.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this utility model provides the following technical solution: a condensate discharge mechanism for a paper drying cylinder, comprising a main component, wherein the main component includes:

[0008] The base plate has symmetrical supports on its top;

[0009] The ports are symmetrically and rotatably connected to the opposing surfaces of the bracket;

[0010] The cylinder body is fixedly connected to the opposite ends of the ports;

[0011] The main component is provided with a discharge assembly, which includes:

[0012] A cavity is formed inside the cylinder body, and an inclined surface is provided on the cavity;

[0013] A water pump pipe, one end of which is installed through the bracket on the left side, and the other end of which is installed through and extends into the cavity;

[0014] A rotary joint is provided at the connection between the water suction pipe and the cylinder body, and the water suction pipe is rotatably connected to the cylinder body through the rotary joint;

[0015] A water pump is installed on the top of the base plate, and the top input end of the water pump is connected to the water pumping pipe;

[0016] A liquid level sensor is installed on the inner wall of the pumping pipe, and the bottom probe of the liquid level sensor is flush with the bottom of the dormitory discharge assembly.

[0017] The controller is located on the top of the base plate, and the water pump and the lower liquid level sensor are electrically connected through the controller.

[0018] Preferably, a filter screen is provided on the inner wall of the cavity.

[0019] Preferably, a rotating shaft is fixedly connected to the left side wall of the bracket on the right side. The rotating shaft passes through the port and extends into the cavity. A wiper blade is symmetrically and fixedly connected to the outer side wall of the rotating shaft. The wiper blade is slidably connected to the inner side wall of the cavity.

[0020] Preferably, the outer wall of the rotary joint is provided with a sealing groove, and an O-ring is provided in the sealing groove.

[0021] Preferably, an upper liquid level sensor is provided on the inner wall of the pumping pipe. The upper liquid level sensor is located above the lower liquid level sensor, and the upper liquid level sensor is also electrically connected to the pumping pump through the controller.

[0022] Preferably, the wiper blade is made of silicone rubber.

[0023] (III) Beneficial Effects

[0024] Compared with the prior art, this utility model provides a condensate discharge mechanism for paper drying cylinders, which has the following beneficial effects:

[0025] This discharge mechanism facilitates the removal of condensate. The condensate flows through the inclined surface of the cavity to the suction pipe. When the liquid level rises to the lower liquid level sensor probe area, it triggers an electrical signal change. This signal is transmitted to the controller, which then activates the water pump. The pump draws the condensate from the cavity out of the cylinder through the suction pipe, preventing interference with normal heat transfer. When the liquid level in the suction pipe drops below the sensing range of the lower liquid level sensor, the sensor signal recovers, and the controller immediately sends a command to shut down the water pump, preventing steam from being extracted. This solves the problem of large amounts of condensate being produced when steam releases heat and condenses during paper drying in papermaking cylinders. This condensate adheres to the inner surface of the cylinder, affecting heat transfer, and therefore needs to be drained promptly. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of this utility model;

[0027] Figure 2 This is a schematic diagram of the front cross-sectional structure of the cavity in this utility model;

[0028] Figure 3 This is an enlarged structural diagram of point A in this utility model;

[0029] Figure 4 This is a schematic diagram of the lower liquid level sensor and the upper liquid level sensor in this utility model.

[0030] In the picture:

[0031] 1. Main body component; 11. Base plate; 12. Bracket; 13. Cavity; 14. Port;

[0032] 2. Discharge assembly; 21. Cavity; 22. Pump pipe; 23. Rotary joint; 24. Pump; 25. Lower liquid level sensor; 26. Controller; 27. Filter screen;

[0033] 3. Wiper blade; 31. Rotary shaft; 4. O-ring; 5. Liquid level sensor. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0035] Example 1

[0036] See Figure 1-4A paper drying cylinder condensate drainage mechanism includes a main component 1, which includes: a base plate 11 with symmetrically arranged supports 12 on its top; ports 14 symmetrically and rotatably connected to the opposing surfaces of the supports 12; and a cylinder body 13 fixedly connected to the opposing ends of the ports 14. A drainage component 2 is provided on the main component 1, which includes: a cavity 21 formed inside the cylinder body 13, with an inclined surface on the cavity 21; a water suction pipe 22, one end of which passes through the left side of the supports 12, and the other end of which passes through and extends into the cavity 21; and a rotatable connector. A head 23 is located at the connection between the water pump pipe 22 and the cylinder 13, and the water pump pipe 22 is rotatably connected to the cylinder 13 via the rotary joint 23; a water pump 24 is located on the top of the base plate 11, and the top input end of the water pump 24 is connected to the water pump pipe 22; a lower liquid level sensor 25 is located on the inner wall of the water pump pipe 22, and the bottom probe of the lower liquid level sensor 25 is flush with the bottom end of the dormitory discharge assembly 2; a controller 26 is located on the top of the base plate 11, and the water pump 24 and the lower liquid level sensor 25 are electrically connected via the controller 26. A filter screen 27 is provided on the inner wall of the cavity 21. A rotating shaft 31 is fixedly connected to the left side wall of the right bracket 12, and the rotating shaft 31 passes through the port 14 and extends into the cavity 21. A wiper blade 3 is symmetrically and fixedly connected to the outer wall of the rotating shaft 31, and the wiper blade 3 is slidably connected to the inner wall of the cavity 21.

[0037] When the cylinder 13 and port 14 rotate to dry the paper, the steam inside the cavity 21 condenses into condensate. The condensate flows through the inclined surface of the cavity 21 to the pump pipe 22. When the liquid level rises to the probe area of ​​the lower liquid level sensor 25, the lower liquid level sensor 25 detects that the dielectric constant of the medium has switched from the low dielectric constant of the steam to the high dielectric constant of the condensate, triggering a change in the electrical signal. This signal is transmitted to the controller 26, which controls the pump 24 to start. The pump 24 pumps the condensate inside the cavity 21 out of the cylinder 13 through the pump pipe 22 to avoid affecting the normal heat transfer effect. When the liquid level in the pump pipe 22 drops to outside the sensing range of the lower liquid level sensor 25, the signal of the lower liquid level sensor 25 recovers, and the controller 26 immediately sends a command to shut down the pump 24 to prevent steam from being extracted. Before being discharged, the condensate needs to be filtered by the scraper blade 3. The scraper blade 3 can intercept any solid impurities that may be present in the condensate. If these impurities enter the suction pipe, they may wear down the inner wall of the suction pipe 22, reducing its service life. Furthermore, if impurities in the condensate adhere to the lower liquid level sensor 25, they may interfere with the normal operation of the lower liquid level sensor 25, leading to inaccurate measurements or misjudgments. When the cylinder 13 and port 14 rotate, the rotating shaft 31, which is fixedly connected to the bracket 12, remains stationary. As the cylinder 13 rotates, the scraper blade 3 scrapes off the condensate adhering to the inner wall of the cavity 21, allowing it to collect more quickly at the lowest end of the slope. This improves the condensate collection efficiency, reduces condensate residue on the cavity 21, and thus avoids localized temperature drops in the cylinder 13 due to uneven condensate distribution, which could affect the paper drying effect.

[0038] The rotation of the aforementioned cylinder 13 and port 14 can be driven by a motor-driven gear transmission system. Through the meshing of the gears, the torque of the transmission shaft is transmitted to the cylinder 13, causing the cylinder 13 to rotate. The rotation of the cylinder 13 and the drying process are mature technologies, and the specific structure will not be described in detail here.

[0039] Example 2

[0040] An auxiliary function has been added based on Embodiment 1.

[0041] See Figure 1-4 The rotary joint 23 has a sealing groove on its outer wall, and an O-ring 4 is installed in the sealing groove. An upper liquid level sensor 5 is installed on the inner wall of the pumping pipe 22, located above the lower liquid level sensor 25, and is also electrically connected to the pumping pump 24 via the controller 26. The wiper blade 3 is made of silicone rubber.

[0042] When the cylinder 13 and port 14 rotate, the pumping pipe 22 remains stable through the rotary joint 23. When the main seal of the rotary joint 23 wears and the leakage increases, the O-ring 4 can temporarily block the leakage path, providing a maintenance buffer time. Furthermore, the elastic deformation of the O-ring 4 can absorb high-frequency small-amplitude vibrations, reducing the energy transmitted from the cylinder 13 vibration to the pumping pipe 22. The upper liquid level sensor 5 and the lower liquid level sensor 25 have the same function. When the probes of both the lower liquid level sensor 25 and the upper liquid level sensor 5 are submerged, it is determined to be a "full water state". The lower liquid level sensor 25 and the upper liquid level sensor 5 control the pumping pump 24 to run at full speed through the controller 26. When only the probe of the lower liquid level sensor 25 is submerged, the pumping pump 24 runs at low speed or starts and stops intermittently. When the probe of the lower liquid level sensor 25 is not submerged, the pumping pump 24 stops running and steam is drawn in. The lower liquid level sensor 25 and the upper liquid level sensor 5 use dual thresholds to distinguish between a "stable water layer" and a "fluctuating water film," reducing false triggering caused by liquid level fluctuations due to the rotation of the cylinder 13. The silicone rubber wiper blade 3 has excellent high-temperature resistance, maintaining good elasticity and flexibility even in the high-temperature environment of the cylinder 13, and is not prone to aging or deformation. It also has good water resistance and chemical corrosion resistance, showing good tolerance to condensate and other potentially present chemicals. Furthermore, silicone rubber is non-toxic and odorless, and will not adversely affect paper quality.

[0043] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A condensate discharge mechanism for a paper drying cylinder, comprising a main component (1), wherein the main component (1) includes: The base plate (11) has symmetrical supports (12) on its top. Port (14) is symmetrically and rotatably connected to the opposing surface of the bracket (12); The cylinder body (13) is fixedly connected to the opposite end of the port (14); The feature is that: the main body component (1) is provided with an emission component (2), the emission component (2) comprising: A cavity (21) is formed inside the cylinder body (13), and an inclined surface is provided on the cavity (21); A water pump (22) has one end inserted through the bracket (12) on the left side, and the other end inserted through and extended into the cavity (21); A rotary joint (23) is provided at the connection between the water pumping pipe (22) and the cylinder (13), and the water pumping pipe (22) is rotatably connected to the cylinder (13) through the rotary joint (23); A water pump (24) is installed on the top of the base plate (11), and the top input end of the water pump (24) is connected to the water pump pipe (22); The lower liquid level sensor (25) is installed on the inner wall of the pumping pipe (22), and the bottom probe of the lower liquid level sensor (25) is flush with the bottom end of the dormitory discharge assembly (2); The controller (26) is located on the top of the base plate (11), and the water pump (24) and the lower liquid level sensor (25) are electrically connected through the controller (26).

2. A papermaking dryer condensate drain mechanism according to claim 1, characterized in that: A filter screen (27) is provided on the inner wall of the cavity (21).

3. A papermaking dryer condensate drain mechanism according to claim 2, characterized in that: A rotating shaft (31) is fixedly connected to the left side wall of the bracket (12) on the right side. The rotating shaft (31) passes through the port (14) and extends into the cavity (21). A wiper blade (3) is symmetrically and fixedly connected to the outer side wall of the rotating shaft (31). The wiper blade (3) is slidably connected to the inner side wall of the cavity (21).

4. A papermaking dryer condensate drain mechanism according to claim 3, characterized in that: The outer wall of the rotary joint (23) is provided with a sealing groove, and an O-ring (4) is provided in the sealing groove.

5. A papermaking dryer condensate drain mechanism according to claim 4, characterized in that: The inner wall of the pumping pipe (22) is provided with an upper liquid level sensor (5), which is located above the lower liquid level sensor (25). The upper liquid level sensor (5) is also electrically connected to the pumping pump (24) through the controller (26).

6. A papermaking dryer condensate drain mechanism according to claim 5, characterized in that: The wiper blade (3) is made of silicone rubber.

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