Steam energy-saving system for drying cylinder of paper machine

Abstract

The utility model discloses a paper machine drying cylinder steam energy-saving system which comprises a drying cylinder, a water drainage end of the drying cylinder is connected with an air supply pipe, a water drainage pipe and a siphon, the inner wall of the drying cylinder is in a cone shape with a thicker water drainage end and a thinner end, the water drainage end of the inner wall of the drying cylinder is provided with a ring-shaped water collection tank which is coaxially arranged, and the lower end of the siphon extends into the water collection tank. A plurality of rib plates which are arranged at intervals and extend in the axial direction are fixedly connected to the inner wall of the drying cylinder, a plurality of heat conduction rings fixedly connected with the rib plates are further arranged in the drying cylinder, and the heat conduction rings are arranged at intervals in the mode that the density of the heat conduction rings becomes sparse from the drainage end to the other end. The quantitative drainage device is connected to an outlet of the drainage pipe and controls quantitative drainage of the drainage pipe. The drying cylinder has the advantages of fundamentally avoiding the problem that condensate water accumulates on the inner wall of the drying cylinder, improving the heat transfer effect of steam and the drying cylinder, guaranteeing the constant temperature of the drying cylinder and improving the paper drying quality; and the device also has a quantitative drainage function or a timed and quantitative drainage function, so that the drainage amount is accurately quantified, steam waste is effectively avoided, and the energy-saving effect is good.

Description

TECHNICAL FIELD

[0001] The utility model relates to a paper machine drying cylinder steam energy saving system belongs to paper machine energy saving field or steam energy saving field. BACKGROUND

[0002] The drying cylinder for paper machine is a key component when paper drying process is used, and belongs to class I pressure vessel. The working principle of the drying cylinder for paper machine is that high-temperature steam is passed through the drying cylinder for paper machine, the drying cylinder is heated by heat transfer, and the wet paper passing through the surface of the drying cylinder is dried. In the traditional drying cylinder for paper machine, the drying cylinder is generally made of cast iron, the cylinder wall of the cast iron drying cylinder is kept uniform in thickness to ensure the safety, balance and uniform heat transfer of the drying cylinder, and the number of the cast iron drying cylinder accounts for about 2 / 3 of the total number of pressure vessels in the paper industry.

[0003] The traditional cast iron drying cylinder has simple structure and low cost, and is widely used, but has the following disadvantages: 1. During the operation of the drying cylinder, the steam in the cylinder will gradually condense into water due to the heat release for drying the paper; since the cylinder wall of the cast iron drying cylinder is uniform in thickness and the drying cylinder is always rotating, a layer of condensed water will be uniformly attached to the inner side of the cylinder wall, which completely blocks the contact between the steam and the cylinder wall and reduces the heat transfer efficiency of the hot steam to the cylinder wall; 2. A fixed siphon pipe and a liquid level sensor are arranged in the traditional drying cylinder, the inlet of the siphon pipe does not touch the cylinder wall but is immersed in the condensed water, the condensed water is automatically discharged under the steam pressure after the liquid level of the condensed water triggers the liquid level sensor, but since there is no accurate or quantitative drainage function and the liquid level sensor has hysteresis, part of the steam will be discharged when the water is drained, resulting in a large loss of steam heat; 3. Since a layer of condensed water is uniformly attached to the inner side of the cylinder wall, a large amount of condensed water has been stored in the drying cylinder when the liquid level reaches the drainage requirement, which seriously affects the heat transfer between the steam and the cylinder wall and causes the temperature of the drying cylinder to fluctuate greatly. SUMMARY

[0004] The utility model solves the technical problem of providing a paper machine drying cylinder steam energy saving system with reasonable structure, which fundamentally avoids the problem of condensed water accumulation on the inner wall of the drying cylinder, improves the heat transfer effect of the steam and the drying cylinder, ensures the constant temperature of the drying cylinder, improves the drying quality of the paper, has the functions of quantitative drainage or timed and quantitative drainage, accurately quantifies the drainage amount, effectively avoids the waste of steam, and has good energy saving effect.

[0005] To solve the above technical problems, the patent application includes a dryer, the drainage end of the dryer is connected with a gas supply pipe penetrating inside and outside of the dryer through a rotary sealing connector, a drainage pipe is inserted in the gas supply pipe, the inner end of the drainage pipe is fixedly connected with a siphon pipe extending to the condensate water, and the structure features are that: the inner wall of the dryer is in a conical shape with the drainage end being thicker and the other end being thinner, the drainage end of the inner wall of the dryer is provided with a coaxially arranged annular water collecting groove, and the lower end of the siphon pipe extends into the water collecting groove; a plurality of rib plates are fixedly connected to the inner wall of the dryer and extend axially at intervals, a plurality of heat conducting rings are further arranged in the dryer and are fixedly connected to the rib plates, and the heat conducting rings are arranged at intervals in a manner of gradually changing from dense to sparse from the drainage end to the other end; and a quantitative drainage device is further connected to the outlet of the drainage pipe to control the quantitative drainage of the drainage pipe.

[0006] The present application is to avoid the problem of condensate accumulation on the inner wall of the dryer by centrifugal flow drainage structure and balanced heat conduction structure, improve the steam and dryer heat transfer effect, and ensure the constant temperature of the dryer. It also has the function of quantitative drainage or timed quantitative drainage, which can accurately control the amount of drainage and effectively avoid steam waste, and has good energy saving effect. In terms of structure, the centrifugal flow drainage structure includes a dryer, a rib plate, a water collecting tank and a quantitative drainage device. The dryer is the main component of the centrifugal drainage structure and the main place for implementing centrifugal drainage. In the present application, the dryer body is a circular tube structure. For convenience of description, the end of the dryer where the drainage pipe is installed is called the drainage end, and the other end is called the fixed end. In the present application, the outer wall of the dryer is a cylindrical structure with uniform thickness, but the inner wall of the dryer is a conical or trumpet-shaped structure with one end thick and the other end thin. Specifically, the drainage end of the inner wall of the dryer is thicker and the fixed end is thinner. After such arrangement, when the dryer is working, the rotating dryer will generate centrifugal force, which not only makes the condensate adhere to the inner wall of the dryer, but also makes the condensate flow automatically from the fixed end to the drainage end. This arrangement has multiple effects: 1. Avoiding the condensate adhering to the inner wall of the dryer for a long time, making the steam and the dryer directly contact, and improving the steam and dryer heat transfer effect; 2. Automatically gathering the condensate to the drainage end, which helps to concentrate drainage and improves the amount and effect of each drainage. In the present application, a plurality of rib plates are uniformly distributed on the inner wall of the dryer, and the rib plates are long strip plates arranged along the axial direction of the dryer. Adjacent rib plates are arranged at intervals, and each interval is equidistant. Thus, the adjacent two rib plates and the corresponding inner wall of the dryer form an axially extending "flow guide groove". One of the functions of the flow guide groove is to increase the surface area of the inner wall of the dryer and improve the heat transfer efficiency of the steam and the dryer; the second function is to guide or flow the condensate formed on the surface to the drainage end of the dryer along the groove wall as soon as possible. In the present application, the drainage end of the inner wall of the dryer is provided with a water collecting tank, which is a groove recessed in the inner wall of the dryer and also an annular groove coaxially arranged with the dryer. The condensate collected by the centrifugal force at the drainage end of the dryer will automatically flow into the water collecting tank, which plays a role in concentrating and containing the condensate. In the present application, the lower end of the siphon pipe connected with the drainage pipe extends into the water collecting tank, which can effectively prevent steam from entering the siphon pipe, helping to concentrate and quickly drain the water, and effectively avoiding the misdrainage of steam, improving the energy utilization rate. The outer end of the drainage pipe is connected with a quantitative drainage device, which can only be discharged when it contains a fixed amount of condensate, i.e. only a fixed amount of condensate can be discharged each time, effectively solving the problem of heat loss caused by the discharge of hot steam when draining the condensate in the traditional dryer system. In the present application, the balanced heat conduction structure mainly includes a dryer, a rib plate and a heat conduction ring. As mentioned above, the inner wall of the dryer and the rib plate form a "flow guide groove", which has the effect of increasing the surface area of the inner wall of the dryer and improving the heat transfer efficiency of the steam and the dryer.The rib plate has the aforementioned advantages, but the rib plate cannot be set too high, otherwise the rib plate that is too protruding will generate resistance and turbulence to the steam in the dryer when the dryer rotates. To solve the above problems, the patent application further provides a heat conducting ring in the dryer. The heat conducting ring is a circular plate, and the heat conducting ring is coaxially arranged with the dryer. Moreover, the outer periphery of the heat conducting ring is fixedly connected with each rib plate, so that the dryer, the rib plate and the heat conducting ring form an integrated structure. The main function of the heat conducting ring is to increase the surface area of the inner wall of the dryer through the rib plate or instead of the rib plate, to improve the heat exchange efficiency of the steam and the dryer, and to reduce the heat loss. Because the heat conducting ring is coaxially arranged with the dryer, when the dryer rotates, the heat conducting ring rotates in its own track, which improves the heat transfer without generating any rotating resistance. In the patent application, the number of heat conducting rings is several, and each heat conducting ring is arranged in a manner of gradually changing from dense to sparse from the drainage end of the dryer to the other end. The main purpose of this arrangement is to solve the problem of uneven temperature of the outer wall of the dryer caused by the uneven heat transfer of the steam and the cylinder wall of the dryer, which is caused by the thin cylinder wall at the drainage end and the thick cylinder wall at the other end. The uneven thickness of the cylinder wall will lead to different heat capacities, and the same heat provided during the drying of paper will cause different temperature changes at the two ends. This will cause the temperature at the drainage end to change greatly and the temperature at the other end to change slightly. The setting of the heat conducting ring will compensate for the heat capacity of the dryer, making the overall heat capacity of the dryer consistent and ensuring the quality of the dried paper. In the patent application, the heat conducting ring is arranged as a circular plate instead of a circular plate, mainly using the ring hole at the center of the heat conducting ring as a flow channel for the steam in the dryer, which helps to improve the flow and heat transfer uniformity of the steam. In summary, the centrifugal flow guide drainage structure concentrates and quantitatively discharges the condensed water, improves the heat transfer efficiency and energy saving effect; the balanced heat conducting structure ensures the consistency of the drying effect of the dryer, improves the heat energy utilization rate and the quality of the dried paper.

[0007] As an implementation manner, the quantitative drainage device comprises a quantitative cylinder connected with the water inlet end and the drainage pipe, a cylinder plug capable of sliding along the inner wall of the quantitative cylinder is inserted in the quantitative cylinder, the cylinder plug is empty of the condensed water at the emptying position of the quantitative cylinder and the quantitative cylinder is full of the condensed water at the full water position; a water inlet valve is connected between the water inlet end of the quantitative cylinder and the drainage pipe, a drainage valve is connected to the lower part of the quantitative cylinder corresponding to the water inlet end; the actions of the water inlet valve and the drainage valve and the movement of the cylinder plug are controlled by a control mechanism.

[0008] As an implementation manner, the control mechanism comprises a shell connected with the other end of the quantitative cylinder, a main slide is arranged in the shell corresponding to the center of the cylinder plug, an extrusion rod in pressing cooperation with the cylinder plug is slidably inserted in the main slide, and a rack is arranged on the outer wall of the extrusion rod; a gear driven by a motor is installed in the shell, and the gear and the rack are engaged; a controller for controlling the motor, the water inlet valve and the drainage valve is further included.

[0009] As an improvement, a full cylinder switch electrically connected with the controller is installed at the inner end of the shell near the quantitative cylinder, and the cylinder plug is pushed by the condensed water to trigger the full cylinder switch when it is close to the shell.

[0010] As a further improvement, an emptying limit switch electrically connected with the controller is installed at the outer end of the shell, and the outer end of the extrusion rod triggers the emptying limit switch when the motor drives the extrusion rod to push the cylinder plug to the emptying position.

[0011] As an improvement, a standby switch electrically connected with the controller is installed at the inner end of the shell, and the inner end of the extrusion rod triggers the standby switch when the motor drives the extrusion rod to move away from the cylinder plug and make the inner end of the extrusion rod close to the inner end of the shell.

[0012] As an improvement, a secondary slide is provided through the center of the extrusion rod, and a balance rod with its inner end fixedly connected with the cylinder plug is slidingly inserted into the secondary slide.

[0013] As a further improvement, the siphon pipe is bent into a C shape, the C-shaped opening of the siphon pipe is arranged in a direction opposite to the flow direction of the condensed water below, and the water inlet of the siphon pipe is also arranged in a direction opposite to the flow direction of the condensed water below, so that the rotating condensed water can be smoothly filled into the drain pipe from the water inlet of the siphon pipe as much as possible.

[0014] As a further improvement, a water collecting cover is installed at the water inlet of the siphon pipe, the opening of the water collecting cover is slightly smaller than the cross section of the water collecting groove, and the shape of the opening of the water collecting cover is adapted to the shape of the cross section of the water collecting groove.

[0015] As an improvement, the heat conducting ring is a circular ring and is coaxially arranged with the drying cylinder.

[0016] In summary, the paper machine drying cylinder steam energy saving system with the structure has reasonable structure, fundamentally avoids the problem of condensate water accumulation on the inner wall of the drying cylinder, improves the steam and drying cylinder heat transfer effect, ensures the constant temperature of the drying cylinder, improves the drying quality of the paper, and has the functions of quantitative drainage or timed quantitative drainage, so that the drainage amount is accurately quantified, steam waste is effectively avoided, and the energy saving effect is good. BRIEF DESCRIPTION OF DRAWINGS

[0017] The patent application will be further described in detail in combination with the drawings:

[0018] Figure 1 It is a perspective structural schematic view of the utility model;

[0019] Figure 2 It is a cooperation structural schematic view of the drying cylinder, the heat conducting ring and the siphon pipe;

[0020] Figure 3 It is a cooperation structural schematic view of the water collecting groove, the rib plate and the heat conducting ring;

[0021] Figure 4 It is a cooperation structural schematic view of the siphon pipe, the drain pipe and the control mechanism;

[0022] Figure 5 The matching structure diagram of the cylinder plug, the extrusion rod and the controller;

[0023] Figure 6 The matching structure diagram of the motor, the gear, the rack, the extrusion rod and the sub slide;

[0024] Figure 7 The matching structure diagram of the siphon and the water collecting cover. DETAILED DESCRIPTION

[0025] As Figures 1-7As shown, in the present embodiment, the paper machine dryer steam energy saving system comprises a dryer 1, a gas supply pipe 3 through the inside and outside of the dryer is connected to the drainage end of the dryer through a rotating sealing connector 2, a drainage pipe 4 is inserted into the gas supply pipe, and a siphon pipe 5 extending to the condensed water is fixedly connected to the inner end of the drainage pipe. In the present patent application, the inner wall of the dryer is conical with the drainage end being thicker and the other end being thinner, the drainage end of the inner wall of the dryer is provided with a coaxially arranged annular water collecting tank 6, and the lower end of the siphon pipe extends into the water collecting tank. A plurality of rib plates 7 are fixedly connected to the inner wall of the dryer and extend axially, and a plurality of heat conducting rings 8 are fixedly connected to the rib plates. The heat conducting rings are arranged in a manner of gradually decreasing from the drainage end to the other end. The present patent application also comprises a quantitative drainage device 9 connected to the outlet of the drainage pipe to control the quantitative drainage of the drainage pipe. The present patent application fundamentally avoids the problem of condensed water accumulation on the inner wall of the dryer by using a centrifugal flow guiding and draining structure and an equalizing heat conducting structure, improves the steam and dryer heat transfer effect, and ensures the constant temperature of the dryer. The present patent application also has the functions of quantitative drainage or timed quantitative drainage, accurately quantifies the amount of drainage, effectively avoids steam waste, and has good energy saving effect. In terms of structure, the centrifugal flow guiding and draining structure comprises a dryer, rib plates, a water collecting tank, and a quantitative drainage device. The dryer is the main component of the centrifugal draining structure and is also the main place for implementing centrifugal draining. In the present patent application, the dryer body is a circular pipe structure. For convenience of description, one end of the dryer where the drainage pipe is installed is referred to as the drainage end, and the other end is referred to as the fixed end. In the present patent application, the outer wall of the dryer is cylindrical with consistent thickness, but the inner wall of the dryer is conical or trumpet-shaped with one end being thicker and the other end being thinner. Specifically, the drainage end of the inner wall of the dryer is thicker and the fixed end is thinner. After such arrangement, when the dryer is working, the rotating dryer will generate a centrifugal force, which not only makes the condensed water adhere to the inner wall of the dryer, but also makes the condensed water automatically flow from the fixed end to the drainage end. Such arrangement has multiple effects: 1. It avoids the long-term adhesion of condensed water to the inner wall of the dryer, makes the steam and the dryer directly contact, and improves the steam and dryer heat transfer effect; 2. It automatically collects the condensed water to the drainage end, which is helpful for concentrated drainage and improves the amount and effect of each drainage. In the present patent application, a plurality of rib plates are uniformly distributed on the inner wall of the dryer, and the rib plates are long strip plates extending along the axial direction of the dryer. Adjacent rib plates are arranged at intervals, and each interval is equidistant. In this way, adjacent two rib plates and the corresponding inner wall of the dryer form an axially extending "flow guiding groove". One of the functions of the flow guiding groove is to increase the surface area of the inner wall of the dryer and improve the steam and dryer heat transfer efficiency; the other function is to guide or flow the condensed water formed on the surface to the drainage end of the dryer as soon as possible. In the present patent application, the drainage end of the inner wall of the dryer is provided with a water collecting tank, which is a groove recessed in the inner wall of the dryer and also an annular groove coaxially arranged with the dryer. The condensed water collected to the drainage end of the dryer by the centrifugal force will automatically flow into the water collecting tank, and the water collecting tank plays a role in concentrating and containing the condensed water.In the present patent application, the lower end of the siphon pipe in communication with the drain pipe extends into the sump, so that steam can be effectively prevented from entering the siphon pipe during drainage, which helps to concentrate and quickly drain water, and also effectively prevents steam from being misdrained, thereby improving energy utilization. The outer end of the drain pipe is connected with a quantitative drainage device, which can only be discharged after containing a fixed amount of condensed water, i.e., only a fixed amount of condensed water can be discharged each time, effectively solving the problem of heat loss caused by the discharge of hot steam when discharging condensed water in the traditional dryer system. In the present patent application, the balanced heat conduction structure mainly includes a dryer, a rib plate, and a heat conduction ring. As mentioned above, the inner wall of the dryer and the rib plate form a "flow guide groove", which has the effect of increasing the surface area of the inner wall of the dryer and improving the heat transfer efficiency of the steam and the dryer. Although the rib plate has the aforementioned advantages, the rib plate cannot be set too high, otherwise the rib plate will generate resistance and disturb the steam in the dryer when the dryer rotates. To solve the above problem, the present patent application further provides a heat conduction ring in the dryer. The heat conduction ring is a circular plate, and the heat conduction ring is coaxially arranged with the dryer. Moreover, the outer periphery of the heat conduction ring is fixedly connected with each rib plate, so that the dryer, the rib plate, and the heat conduction ring form an integrated structure. The main function of the heat conduction ring is to increase the surface area of the inner wall of the dryer through the rib plate or instead of the rib plate, to improve the heat exchange efficiency of the steam and the dryer, and to reduce heat loss. Because the heat conduction ring is coaxially arranged with the dryer, the heat conduction ring rotates in its own track when the dryer rotates, which improves heat transfer without generating any rotational resistance. In the present patent application, the number of heat conduction rings is several, and each heat conduction ring is arranged in a manner of gradually changing from dense to sparse from the drainage end of the dryer to the other end. The main purpose of this arrangement is to solve the problem of uneven temperature of the outer wall of the dryer caused by uneven heat transfer of water vapor and the cylinder wall due to the thin cylinder wall at the drainage end and the thick cylinder wall at the other end. Uneven thickness of the cylinder wall will result in different heat capacity, providing the same amount of heat when drying paper, resulting in different temperature changes at the drainage end and the other end. After setting the heat conduction ring, the heat capacity of the dryer is compensated, making the overall heat capacity of the dryer consistent, ensuring the quality of the dried paper. In the present patent application, the heat conduction ring is arranged as a circular plate instead of a circular plate, mainly using the ring hole at the center of the heat conduction ring as a flow channel for water vapor in the dryer, which helps to improve the flow and heat transfer uniformity of water vapor. In summary, the centrifugal flow guide drainage structure enables the concentrated and quantitative discharge of condensed water, improves heat transfer efficiency and energy saving effect; the balanced heat conduction structure ensures the consistency of the drying effect of the dryer, thereby improving the heat energy utilization rate and the quality of the dried paper.

[0026] In the present embodiment, the quantitative water drainage device comprises a quantitative cylinder 10 connected with the water outlet pipe at the water inlet end, a cylinder plug 11 inserted in the quantitative cylinder and capable of sliding along the inner wall of the quantitative cylinder in a sealed manner, the cylinder plug being capable of emptying the condensed water in the quantitative cylinder at the emptying position and filling the condensed water in the quantitative cylinder at the full water position; a water inlet valve 12 connected between the water inlet end of the quantitative cylinder and the water outlet pipe, and a water outlet valve 13 connected with the quantitative cylinder at the lower part corresponding to the water inlet end; the actions of the water inlet valve and the water outlet valve and the movement of the cylinder plug are controlled by a control mechanism 14. In the present patent application, the quantitative water drainage device mainly comprises five parts, i.e. the quantitative cylinder, the cylinder plug, the water inlet valve, the water outlet valve and the control mechanism. The quantitative cylinder is a cylindrical cylinder body and is a component for quantitatively containing the condensed water. The quantitative cylinder has two ends, for the convenience of description, the end at the bottom of the cylinder is referred to as the bottom end or the water inlet end, and the other end is referred to as the cylinder mouth end. The condensed water discharged from the water outlet pipe enters the quantitative cylinder through the water inlet end of the quantitative cylinder. The cylinder plug is arranged in the quantitative cylinder and is capable of freely sliding along the inner wall of the quantitative cylinder in an axial direction. The quantitative cylinder and the cylinder plug form a relatively closed cavity, which is a container for quantitatively containing the condensed water. In the present patent application, the water inlet valve is arranged between the water inlet end of the quantitative cylinder and the water outlet pipe, and the water inlet valve can control the condensed water to enter the quantitative cylinder. In the present patent application, the quantitative cylinder is arranged in a transverse direction. The water outlet valve is arranged at the bottom of the cylinder body close to the water inlet end of the quantitative cylinder, and the water outlet valve is used to discharge the condensed water in the quantitative cylinder. The quantitative water drainage device further comprises a control mechanism, and the quantitative water drainage is controlled by the control mechanism. When the quantitative water drainage is needed, the control mechanism controls the water inlet valve to be opened and the water outlet valve to be closed, the water vapor pressure in the drying cylinder automatically presses the condensed water in the water collecting tank to enter the quantitative cylinder through the siphon pipe and the water outlet pipe, and at this time, the cylinder plug is synchronously moved to the cylinder mouth end under the action of the water pressure. When the set water drainage amount of the quantitative cylinder is reached, the control mechanism controls the water inlet valve to be closed and the water outlet valve to be opened, and simultaneously pushes the cylinder plug to move to the water inlet end. In this process, the condensed water in the quantitative cylinder is gradually discharged through the water outlet valve. When the cylinder plug reaches the water inlet end of the quantitative cylinder, the condensed water in the quantitative cylinder is completely emptied, the water outlet valve is closed, and the control mechanism is reset. In this way, a complete quantitative water drainage process is completed. When the next quantitative water drainage period comes, the above process is repeated. The length of the water drainage period is set in advance in the control mechanism according to different working conditions, and the control mechanism automatically controls the work according to the water drainage period.

[0027] In the embodiment, the control mechanism comprises a housing 15 connected with the other end of the quantitative cylinder, a main slide 16 corresponding to the center of the cylinder plug is arranged in the housing, an extrusion rod 17 in pressing cooperation with the cylinder plug is slidingly inserted in the main slide, a rack 18 is arranged on the outer wall of the extrusion rod; a gear 20 driven by a motor 19 is arranged in the housing, the gear is in engagement with the rack; a controller 21 for controlling the motor, the water inlet valve and the water outlet valve is further included. In the patent application, the control mechanism mainly comprises six parts, i.e. the housing, the main slide, the extrusion rod, the gear, the motor and the controller. The housing is the main structure of the control mechanism, the shape is not limited, and the housing is a carrier for mounting other components. The main slide is arranged in the housing, and the main slide is arranged towards the cylinder plug. The extrusion rod is slidingly inserted in cooperation with the main slide, and the extrusion rod is also in pressing cooperation with the cylinder plug. The motor is arranged in the housing, and the gear is arranged on the output shaft of the motor. In the patent application, the side wall of the extrusion rod is provided with a rack arranged along the length direction of the extrusion rod, and the rack is in engagement with the gear. Therefore, when the motor is powered, the extrusion rod can be driven to move back and forth by the gear, thereby achieving the effect of extruding the cylinder plug to move and thereby draining water. In the patent application, the working of the motor, the water inlet valve and the water outlet valve is controlled by the controller. Specifically, according to the water draining time setting, the controller controls the water inlet valve to be opened, the high-pressure steam in the cylinder forces the condensed water to push the cylinder plug to slide outward. When the cylinder plug is pushed to the position of the housing, it will be limited, and this position is also the set position of the quantitative cylinder for quantitative water draining. When the cylinder plug reaches this position, the quantitative cylinder is filled with condensed water. At this time, the controller controls the water inlet valve to be closed and the water outlet valve to be opened according to the set full water time, and controls the motor to be forward rotated to drive the extrusion rod to push the cylinder plug to move into the quantitative cylinder, at this time, the condensed water in the quantitative cylinder starts to be drained through the water outlet valve. When the extrusion rod pushes the cylinder plug to reach the bottom of the quantitative cylinder, all the condensed water is completely drained. At this time, the controller controls the water outlet valve to be closed, and controls the motor to be reversed to make the extrusion rod exit the quantitative cylinder, but the cylinder plug remains at the bottom of the quantitative cylinder. For the convenience of description, this state is called initial state or emptying state. When the next water draining time comes, the controller will control the water inlet valve, the water outlet valve and the motor to repeat the above process. It should be noted that the water draining time or the water draining period is set in the controller in advance according to the actual working condition of each factory. The set water draining time or water draining period can ensure that there is still a part of condensed water remaining in the cylinder after the cylinder is filled with condensed water each time, so that it can be ensured that the quantitative cylinder is filled with condensed water without mixing high-temperature water vapor each time, thereby ensuring maximum energy saving of heat. For example, according to the working condition, if there are 10 liters of condensed water in the cylinder, only 9 liters of condensed water is drained each time, and the remaining 1 liter is accumulated until 10 liters of condensed water is accumulated to be drained. According to the working condition, the time or period for accumulating condensed water is the water draining time or water draining period.

[0028] In the embodiment, a full cylinder switch 22 is installed on the inner end of the shell and electrically connected to the controller, and the cylinder plug is pushed by the condensed water to trigger the full cylinder switch when it is close to the shell. In the patent application, a full cylinder switch is installed on the shell and electrically connected to the input end of the controller. The main function of the full cylinder switch is to trigger the full cylinder switch when the cylinder plug is pushed by the condensed water to the shell, that is, to sense the condensed water full cylinder signal and transmit it to the controller. In the patent application, the controller has two bases for judging the full cylinder, one is the sensing signal of the full cylinder switch, and the other is the full cylinder time. When the full cylinder switch is damaged, the controller can only control the output of the control signal of the next action according to the full cylinder time.

[0029] In the embodiment, an emptying limit switch 23 is installed on the outer end of the shell and electrically connected to the controller, and the outer end of the extrusion rod triggers the emptying limit switch when the motor drives the extrusion rod to push the cylinder plug to the emptying position. In the patent application, the controller has two signs or signals for controlling the emptying of the cylinder plug, one is the number of turns of the motor as described above, and the number of turns indicates that the cylinder plug is pushed to the bottom of the drying cylinder, that is, the condensed water has been emptied. The other sign or signal is that an emptying limit switch is installed on the outer end of the shell, and the outer end of the extrusion rod triggers the emptying limit switch when the motor drives the extrusion rod to push the cylinder plug to the emptying position. At this time, the emptying limit switch transmits the emptying signal to the controller, and the controller controls the motor to reverse and reset. In actual work, as long as one of the two signs or signals is effective, the controller controls the motor to reverse and reset to ensure the safety of the work. To put it another way, even if it is not completely emptied, the motor will reverse and reset, and the condensed water will slowly flow down under the action of gravity, only the speed is slower.

[0030] In the embodiment, a standby switch 24 is installed on the inner end of the shell and electrically connected to the controller, and the inner end of the extrusion rod triggers the standby switch when the motor drives the extrusion rod away from the cylinder plug and the inner end of the extrusion rod is close to the inner end of the shell. In the patent application, the controller or the standby sign or standby signal of the control mechanism has two, one is the number of turns of the motor as described above, and the number of turns indicates that the extrusion rod reaches the reset position, and the motor can be controlled to stop standby, and the drain valve can be controlled to close standby. For the convenience of description, this state is called standby state or reset state. The other sign or signal is that a standby switch is installed on the inner end of the shell, and the inner end of the extrusion rod triggers the standby switch when the motor drives the extrusion rod away from the cylinder plug. At this time, the standby switch transmits the standby signal to the controller, and the controller controls the motor to stop and controls the drain valve to close to enter the standby state. In actual work, as long as one of the two signs or signals is effective, the controller controls the drain valve to close and does not issue any control signal, waiting for the arrival of the next drainage period.

[0031] In the embodiment, a sub slide 25 is arranged through the center of the extruding rod, and a balance rod 26 is slidably inserted into the sub slide and fixedly connected with the cylinder plug coaxially at the inner end. In the patent application, the sub slide is arranged through the center of the extruding rod. The balance rod is slidably inserted into the sub slide and fixedly connected with the cylinder plug coaxially at the inner end. The main function of the balance rod is to enhance the stability or balance of the cylinder plug when sliding, so that the cylinder plug can slide along the inner wall of the quantitative cylinder more smoothly, and the reliability of the drainage is ensured.

[0032] In the embodiment, the siphon is bent into a C shape, and the C-shaped opening of the siphon is arranged in the opposite direction to the flow direction of the water below the condensed water, and the water inlet of the siphon is also arranged in the opposite direction to the flow direction of the water below the condensed water, so that the rotating condensed water can be smoothly filled into the drain pipe from the water inlet of the siphon. In the patent application, the siphon is not arranged vertically downward at the center line of the drying cylinder, but is bent into a C shape. The plane where the C-shaped track of the siphon is arranged is parallel to the end surface of the drying cylinder, so that the resistance generated by the fixed siphon when the drying cylinder rotates can be reduced. In the patent application, the C-shaped opening of the siphon is arranged in the opposite direction to the flow direction of the water below the condensed water, and the water inlet of the siphon is also arranged in the opposite direction to the flow direction of the water below the condensed water. The arrangement has two effects. One effect is that in the standby state, the rotating condensed water is always in the state of flowing into and filling the siphon and the drain pipe, effectively avoiding the high-temperature steam entering the siphon and the drain pipe, and further avoiding the high-temperature steam being discharged outside the drying cylinder during drainage, so as to ensure the effective use of heat energy. The other effect is that during the drainage process, the rotating condensed water can be preferentially introduced into the siphon, the drain pipe and the quantitative cylinder, so as to reduce the opportunity of high-temperature steam entering, and also to ensure that the heat is not wasted, thereby achieving the energy-saving effect.

[0033] In the embodiment, the water inlet of the siphon is provided with a water collecting cover 27, and the shape of the opening of the water collecting cover is set to be square to adapt to the cross-sectional shape of the water collecting groove, so as to collect more condensed water. In the patent application, the opening of the water collecting cover is smaller than the cross section of the water collecting groove, so that the rotating water collecting groove and the stationary water collecting cover can not collide, and the reliability of the drainage is ensured.

[0034] In the embodiment, the heat conducting ring is arranged in a circular ring and coaxially arranged with the drying cylinder, so that the circular ring can more uniformly receive the steam heat and transfer the heat to the drying cylinder, which is helpful to the consistency and stability of the surface temperature of the drying cylinder.

[0035] In the embodiment, the controller 21 adopts the AT89C52 single-chip microcomputer produced by the American ATMEL company, and the full-cylinder switch 22, the emptying limit switch 23 and the standby switch 24 adopt conventional inductive switches or travel switches, the structure and working principle of which are known technologies and will not be described here.

Claims

1. A paper machine drying cylinder steam energy saving system, comprising a drying cylinder (1), a gas supply pipe (3) through the inside and outside of the drying cylinder is connected to the draining end of the drying cylinder through a rotary seal connecting piece (2), a draining pipe (4) is inserted into the gas supply pipe, a siphon pipe (5) extending to condensate water is fixed to the inner end of the draining pipe, characterized in that: The inner wall of the drying cylinder is conical with the thick end being the drainage end and the thin end being the other end. The drainage end of the inner wall of the drying cylinder is provided with a coaxially arranged annular water collecting groove (6), and the lower end of the siphon pipe extends into the water collecting groove. A plurality of rib plates (7) are fixedly connected to the inner wall of the drying cylinder and extend axially. A plurality of heat conducting rings (8) are arranged in the drying cylinder and are fixedly connected to the rib plates. The heat conducting rings are arranged in a manner that the density gradually decreases from the drainage end to the other end. A quantitative water drainage device (9) is connected to the outlet of the drainage pipe to control the quantitative drainage of the drainage pipe. The quantitative water drainage device (9) comprises a quantitative cylinder (10) connected to the drainage pipe at the water inlet end. A cylinder plug (11) capable of sliding axially along the inner wall of the quantitative cylinder is arranged in the quantitative cylinder. The cylinder plug is capable of draining the condensed water when being at the emptying position of the quantitative cylinder and filling the quantitative cylinder with the condensed water when being at the full water position. A water inlet valve (12) is connected between the water inlet end of the quantitative cylinder and the drainage pipe. A water outlet valve (13) is connected to the lower part of the quantitative cylinder corresponding to the water inlet end. The actions of the water inlet valve and the water outlet valve and the movement of the cylinder plug are controlled by a control mechanism (14).

2. The paper machine dryer steam energy saving system of claim 1 wherein: The control mechanism comprises a housing (15) connected to the other end of the quantitative cylinder. A main slide (16) corresponding to the center of the cylinder plug is arranged in the housing. An extrusion rod (17) in pressing cooperation with the cylinder plug is slidably arranged in the main slide. A rack (18) is arranged on the outer wall of the extrusion rod. A gear (20) driven by a motor (19) is arranged in the housing. The gear is in engagement with the rack. A controller (21) for controlling the motor, the water inlet valve and the water outlet valve is further arranged in the housing.

3. The paper machine dryer steam energy saving system of claim 2 wherein: A full cylinder switch (22) electrically connected to the controller is arranged at the inner end of the housing close to the quantitative cylinder. The full cylinder switch is triggered when the cylinder plug is pushed by the condensed water to the position close to the inner end of the housing.

4. The paper machine dryer steam energy saving system of claim 3 wherein: An emptying limit switch (23) electrically connected to the controller is arranged at the outer end of the housing. The outer end of the extrusion rod triggers the emptying limit switch when the motor drives the extrusion rod to push the cylinder plug to the emptying position.

5. The paper machine dryer steam energy saving system of claim 4 wherein: A standby switch (24) electrically connected to the controller is arranged at the inner end of the housing. The inner end of the extrusion rod triggers the standby switch when the motor drives the extrusion rod to move away from the cylinder plug and the inner end of the extrusion rod is close to the inner end of the housing.

6. The paper machine dryer steam energy saving system of claim 5 wherein: A secondary slide (25) is arranged through the center of the extrusion rod (17). A balance rod (26) coaxially fixed to the cylinder plug is slidably arranged in the secondary slide.

7. The paper machine dryer steam energy saving system of any of claims 1-6, characterized by: The siphon pipe is bent into a C shape. The C-shaped opening of the siphon pipe is arranged in a direction opposite to the direction of the water flow below the condensed water. The inlet of the siphon pipe is also arranged in a direction opposite to the direction of the water flow below the condensed water, so that the rotating condensed water can be smoothly filled into the drainage pipe from the inlet of the siphon pipe.

8. The paper machine dryer steam energy saving system of claim 7, wherein: A water collecting cover (27) is arranged at the inlet of the siphon pipe. The opening of the water collecting cover is slightly smaller than the cross section of the water collecting groove. The shape of the opening of the water collecting cover is adapted to the shape of the cross section of the water collecting groove.

9. The paper machine dryer steam energy saving system of claim 8 wherein: The heat conducting ring is a circular ring and is coaxially arranged with the drying cylinder.

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