CN212103469U

CN212103469U - Novel rotary siphon device

Info

Publication number: CN212103469U
Application number: CN201921648741.5U
Authority: CN
Inventors: 鲍中华
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-09-24
Filing date: 2019-09-24
Publication date: 2020-12-08
Anticipated expiration: 2029-09-24

Abstract

The invention relates to a novel drying cylinder of a rotary siphon device, which solves the problems that when the drying cylinder is in a high-rotating-speed working condition and condensed water in the cylinder is in a water ring state, the temperature and the amount of the condensed water on the cross width of the cylinder body are greatly changed and the condensed water is difficult to discharge when a fixed siphon device is used for siphoning the condensed water; the problem that when the existing rotary siphon device is unstable in operation, the cylinder is flooded due to the fact that the water ring is thick and cannot blow through steam for drainage is solved; the problem that in order to obtain good drainage effect, a deeper inner groove is required to be formed, so that the wall thickness of the cylinder of the drying cylinder exceeds the calculated wall thickness of the container by more than one time is solved. On the basis of the design of the drying cylinder of the existing rotary siphon device, a liquid collecting tank air inlet consisting of a side air inlet and a middle air inlet is arranged on the tank body of the liquid collecting tank and the connecting part of the tank body and the siphon. Steam can enter the liquid collecting tank from the air inlet as usual under the condition that the water ring is extremely thick to form high-speed steam jet flow, and condensed water in the atomizing tank is normally blown through for drainage.

Description

Novel rotary siphon device

Technical Field

A novel drying cylinder with a rotary siphon device belongs to the field of drying cylinders in the fields of papermaking, rubber, steel and the like or drying cylinders with cold and hot media introduced into the drying cylinder for drying, heating and cooling paper, fibers, films, various fabrics, sheets and the like outside the drying cylinder.

Background

The drying cylinder is widely used in the fields of papermaking, rubber, steel and the like, and is used for drying, heating and cooling paper, films, fibers, various fabrics and various sheets.

The most common use of drying cylinders is to introduce steam into the cylinder to dry the paper, film, fibers, fabrics and sheets on the outer wall of the cylinder. When steam is introduced into the drying cylinder to dry paper, films, fibers, various fabrics and various sheets on the outer wall of the cylinder of the drying cylinder, the steam is usually liquefied into water from gaseous state, so that a large amount of condensed water is continuously generated in the drying cylinder when the drying cylinder works. The condensed water must be drained out of the cylinder in time, otherwise the cylinder cannot work normally.

When the rotating speed of the drying cylinder is low, the condensed water in the cylinder is in a water cushion or waterfall state. Simple fixed siphons are typically used for this purpose. Simple fixed siphons must maintain a large siphon gap to eliminate the effects of the processing conditions of the internal surface of the drying cylinder and the thermal expansion of the suction nozzle itself. And because the fixed siphon device usually siphons the condensed water in the cylinder by a nozzle, the cross-web temperature distribution of the drying cylinder and the amount of the condensed water have large changes. Furthermore, from a mechanical point of view, the stationary siphons are subject to a high level of wear and damage due to the constant impact of the condensate, and therefore require a high level of maintenance.

When the rotating speed of the drying cylinder is higher, the condensed water in the cylinder is in a water ring state. At this time, the condensate water in the drying cylinder cannot be effectively discharged by using the fixed siphon device singly, auxiliary devices such as a water breaking rod and the like are needed to break a water ring, and necessary measures are needed to collect the condensate water near the siphon suction port of the fixed siphon device. In addition to the problems of inconvenience and mechanical stability caused by the installation of the auxiliary device, the method of draining the condensed water by using the fixed siphon and the auxiliary device also has the problems of large changes of the cross-web temperature distribution and the amount of the condensed water of the drying cylinder.

Therefore, when the condensed water in the cylinder is in a water-ring state, one generally uses a rotary siphon. The gap between the suction nozzle of the rotary siphon device and the inner wall of the drying cylinder can be designed to be 1.6mm all the time, so that the amount of condensed water remained in the cylinder is small, and the small gap also ensures that the temperature distribution of the cross-width of the cylinder surface is small. Since the rotary siphon continuously rotates together with the condensed water, stress is reduced, and thus mechanical stability is much higher than that of the simple stationary siphon. It also has a number of potential disadvantages. When not properly positioned, not the condensed water but the steam comes out of the siphon. In this case, a high blow-through steam pressure is generally required, since the blow-through steam then has to pass through the water ring from the suction nozzle of the siphon into the siphon and overcome the centrifugal force of the condensate moving in a circular manner with the cylinder wall. If the water ring is thick when the operation of the drying cylinder is unstable, it is difficult to blow steam through and drain water, so that the rotary siphon cannot drain water normally.

An improvement in the use of a rotary siphon is the provision of an internal groove of sufficient depth in the inner wall of the cylinder, the suction nozzle of the siphon being mounted in the internal groove. The advantage of this solution is that the condensed water is accumulated in the inner tank, and the suction nozzle of the siphon can siphon the condensed water sufficiently, avoiding to the maximum extent that the condensed water but the steam coming out of the siphon. However, the disadvantage is also evident that when the cylinder operation is unstable, it is more difficult to blow through the steam and thus the water drain, and thus the siphon is less able to drain properly. In addition, to provide a siphon with good drainage, the inner tank is typically opened deeper so that the wall thickness of the cylinder exceeds the calculated wall thickness of the container by more than a factor of two.

Disclosure of Invention

The invention discloses a novel drying cylinder of a rotary siphon device, and provides a scheme of the novel rotary siphon device, which comprises the following steps:

a) the problems that when the rotating speed of a drying cylinder is high and condensed water in the cylinder is in a water ring state, the change of the temperature of a cross beam is large and the change of the amount of the condensed water is large due to the use of a fixed siphon are solved;

b) the problem that the water ring is thick and cannot normally drain water when the conventional rotary siphon device is unstable in operation is solved;

c) the problem that the wall thickness of the drying cylinder exceeds the calculated wall thickness of the container by more than one time because a deeper inner groove is required to be formed on the inner wall of the drying cylinder in order to obtain a good drainage effect in the conventional rotary siphon is solved.

The novel drying cylinder of the rotary siphon device comprises a steam inlet 1, a shaft head 2, a cylinder cover 3, a central cylinder 4, a cylinder body 5, a siphon 8, a liquid collecting tank 9, a condensate outlet 12 and other conventional designs of the drying cylinder of the common rotary siphon device in the prior art, and further comprises a side air inlet 10 and a middle air inlet 15 which are arranged on the liquid collecting tank 9 and at the connecting part of the siphon 8 and the liquid collecting tank 9 in different prior arts. Thereby the negative pressure that forms through the high-speed efflux 7 of air inlet on the one hand makes the siphon more powerful, and on the other hand atomizes the comdenstion water in the collecting tank 9 through the high-speed efflux 7 of air inlet, makes the comdenstion water discharge more unobstructed.

Particularly, when the liquid collecting tank 9 is provided with the siphon suction head 14 to siphon condensed water directly from the cylinder wall, the condensed water sucked into the liquid collecting tank 9 from the siphon device 14 is atomized by the high-speed jet flow 7, so that the condensed water is suspended in the air to do linear motion of a transversal line and does not do circular motion under the traction of the adhesive force of the cylinder body, and then strong centrifugal force which must be overcome by siphon is not provided, so that siphon drainage becomes quite smooth, and the ideal situation of siphon drainage by taking pressure steam in the drying cylinder as motive power is realized.

If the inner wall of the cylinder of the drying cylinder is provided with the inner groove 6 and the liquid collecting tank 9 is provided with the strip-shaped siphon opening 11, the condensed water can be directly siphoned from the inner groove 6 on the cylinder wall without the siphon head 14, so that the maximum drainage in the drying cylinder can be realized, and the steam brought out when the siphon 8 siphons the condensed water is minimum. In this case, if the siphon head 14 is installed in the inner tank 6, the water ring on the inner wall can be removed to the maximum extent.

In addition, under the structural design of the invention, even if the situation that the drying cylinder operation is unstable and the water ring is thick occurs, because the air inlet 0 and the middle air inlet 15 can not be submerged, the high-speed steam jet 7 can atomize the condensed water in the liquid collecting tank 9 as usual, the siphon capacity of the siphon pipe 8 is enhanced, and the problem that the conventional rotary siphon can not drain normally at the moment can not occur.

Because the condensed water in the liquid collecting tank 9 is atomized under the action of the high-speed jet flow 7, the siphoning capacity of the siphon pipe 8 is greatly enhanced, so that the depth of the inner tank 6 can be designed to be only 2-5 mm, and the siphon pipe is not required to be designed to be 10-15 mm like the conventional design so as to ensure that the siphon head 14 is completely immersed, so that the design wall thickness of the drying cylinder is reduced by half compared with the design wall thickness of the conventional inner tank, and the equipment cost is greatly reduced.

Since the discharge of such a construction is much smoother and more stable than the discharge of a conventional rotary siphon, the ring of condensate in the drying cylinder, in particular on the wall of the drying cylinder, will be very thin, thereby achieving a much higher heat transfer coefficient than when using a conventional rotary siphon.

The condensed water is carried by the steam and discharged from the siphon 8, and the effective density of the discharged water can be greatly reduced, so that the pressure difference of the discharged water can be greatly reduced, and the condensed water is called 'blowing steam'. The blowing steam has a suction effect, and a 'conveyor' is provided for removing condensed water. Because the blowing steam has a sharp acceleration from zero to a large value when entering the suction end, the acceleration helps to break the condensed water into small particles which are completely mixed and discharged in the form of a mist. This technique has been successfully used in fixed siphon drains. The invention sets side air inlet 10 and middle air inlet 15 on the liquid collecting tank 9 and the connecting part of the siphon 8 and the liquid collecting tank 9, actually, the invention refers to the principle of 'conveyor' of blowing steam of a fixed siphon drainage device, which makes the invention suitable for a rotary siphon device.

Drawings

The embodiment described below with reference to the accompanying drawings will explain in further detail a new type of rotary siphon device cylinder according to the present invention. Fig. 1a is a schematic view 1 of such a drying cylinder; fig. 1b is a schematic view 2 of such a drying cylinder; fig. 1c is a schematic view 3 of such a drying cylinder; fig. 1d is a schematic view 4 of such a drying cylinder; fig. 1e is a schematic view 5 of such a drying cylinder.

The symbols in the drawings are marked with the following symbols: 1. the device comprises a steam inlet 2, a shaft head 3, a cylinder cover 4, a central cylinder 5, a cylinder body 6, an inner groove 7, jet steam 8, a siphon 9, a liquid collecting tank 10, a side air inlet 11, a strip-shaped siphon opening 12, a condensate water outlet 13, a liquid collecting tank with a siphon device 14, a siphon head 15, a middle air inlet 16, a liquid collecting tank with a strip-shaped siphon opening 17, a siphon flared section 18 and an air inlet. The strip siphon opening 11 is shown facing the cylinder wall and the

sump

16 or 13 is pressed against the cylinder wall and the siphon head 14 is located about 2mm from the cylinder wall.

Detailed Description

The preferred 1 st embodiment of the invention is such that: a new cylinder of a rotary siphon device comprising as shown in figure 1 a: 1. steam inlet, 2, shaft head, 3, cylinder cover, 4, central cylinder, 5, cylinder body, 6, inner groove, 8, siphon, 9, liquid collecting tank, 12 and condensate outlet.

Wherein the sump 9 is a structural sump structure of a strip siphon opening sump 16 with air inlet and strip siphon openings 11 as shown in figure 1 b. The siphon tube 8 is located approximately symmetrically in the middle of the strip-shaped siphon nozzle sump 16, and a siphon flare 17 is provided at the connection to the strip-shaped siphon nozzle sump 16. Condensate is drawn from the inner tank 6 into the strip siphon opening sump 16. A plurality of pairs of tubular side intake ports 10 are provided on the strip siphon opening sump 16 in axial symmetry with the siphon tubes 8, wherein the pair farthest from the line siphon tubes 8 is provided on or near the end surface of the strip siphon opening sump 16. The tubular side intake port 10 extends into the liquid collecting tank with the air jet facing the line-of-symmetry siphon 8, and the intake port is on the back or side of the liquid collecting tank and is spaced from the cylinder wall by a sufficient distance, preferably 60 mm-100 mm. The liquid collecting tank and the flaring section are provided with a tubular middle air inlet 15, the middle air inlet 15 extends into the jet orifice of the tank and faces the siphon axis of the siphon pipe 8, and the air inlet has enough distance, preferably 60 mm-100 mm, away from the cylinder wall.

When the novel rotary siphon device works, pressure steam in the drying cylinder enters the liquid collecting tank to form high-speed jet flow, so that large negative pressure is formed, and condensed water in the siphon inner tank 6 is condensed. Because the jet has an angle of divergence of about 30 deg., the high velocity gas flow in the sump is a rotating high velocity turbulent flow that atomizes the condensate in the sump and is entrained by the high velocity gas flow toward the siphon. Because the condensed water is atomized and carried by the high-speed airflow, the siphon condensed water is easier to siphon at this time, as in the case of the fixed siphon device. Because the connecting part of the siphon 8 and the strip-shaped siphon mouth liquid collecting tank 16 is provided with the siphon flared section 17, and the tubular middle air inlet 15 is arranged at the connecting part, the liquid collecting tank can pour the water-vapor mixture to the siphon 8 from the two ends, and the water-vapor mixture can be more smoothly and quickly discharged out of the cylinder from the siphon 8 under the mutual superposition of the siphon action of the siphon 8, the jet action of the middle air inlet 15 and the flared action of the siphon flared section 17.

In particular, in this case, the depth of the inner tank 6 is preferably 2mm to 5mm, and in this case, the strip siphon opening 11 can satisfactorily suck water from the drying cylinder and can maximally prevent the escape of gas from the inner tank when the amount of condensed water in the cylinder is extremely small. The most important is that the wall thickness of the drying cylinder can be greatly reduced, the investment cost is saved, the operation weight is greatly reduced, the operation of the equipment is safer and more reliable, and the service life is longer.

The preferred embodiment of the invention 2 also incorporates a strip siphon opening sump 16, the basic construction of which is the same as that of the previous embodiment 1. Except that the side inlet 10 and intermediate inlet 15 are not tubular pieces but rather have openings in the strip siphon opening sump 16 or siphon tube 8, siphon tube flared section 17, as shown in figure 1 c.

The preferred 3 rd embodiment of the present invention also incorporates a strip-shaped siphon opening sump 16, the basic construction of which is the same as that of the two 1 st and 2 nd embodiments described above. Except that the side inlet 10 and the intermediate inlet 15 are not entirely tubular pieces or openings with a strip-shaped siphon opening sump 16 or siphon tube 8, siphon tube flared section 17. But is designed in a mixed form as required, but the working principle thereof is consistent with the aforementioned embodiments, so that the effects obtained thereby are also consistent with the aforementioned embodiments.

The preferred 4 th embodiment of the invention also incorporates a strip siphon opening sump 16 which has the same basic structure as the previous 3 rd embodiment. Except that the inner wall of the cylinder does not have an inner groove 6. At this time, the strip-shaped siphon inlet is also opposite to the inner wall of the drying cylinder, but is 2 mm-5 mm away from the inner wall. Its working principle is identical to that of the above-mentioned 3 embodiments, so that its obtained effect is identical to that of the above-mentioned embodiment. This embodiment is suitable for situations where the width of the drying cylinder is large or where it is not economical or convenient to machine the inner vat.

The preferred 5 th embodiment of the invention is without the strip siphon openings 11 but with the siphon trap 13, with the siphon trap 13 pressed against the cylinder wall, with the inner groove 6 on the inner wall and the intake being a tubular element, as shown in figure 1 d. The siphon head 14 is mounted at one end on both sides of the sump and at the other end in the inner tank 6, at a distance of about 2mm from the bottom. Condensate is drawn from the inner tank 6 through the siphon tip 14 into the siphoning sump 13. However, other structures and operation principles are the same as those of the above-described embodiment, and therefore, the effects obtained by the above-described embodiment are also the same as those of the above-described embodiment.

The preferred 6 th embodiment of the present invention is the case with the siphon trap 13, and the basic structure is the same as that of the aforementioned 5 th embodiment. Except that the side inlet 10 and intermediate inlet 15 are not tubular members but rather have openings in the siphon sump 13 or siphon tube 8, siphon tube flared section 17, as shown in figure 1 e.

The preferred 7 th embodiment of the present invention is provided with a siphon trap 13, and the basic structure is the same as that of the above 5 th and 6 th embodiments. Except that the side inlet 10 and intermediate inlet 15 are not completely tubular members or openings in the siphon sump 13 or siphon tube 8, siphon tube flared section 17. But is designed in a mixed form as required, but the working principle thereof is consistent with the aforementioned embodiments, so that the effects obtained thereby are also consistent with the aforementioned embodiments.

The preferred 8 th embodiment of the present invention is also provided with a siphon trap sump 13, and the basic structure thereof is the same as that of the aforementioned 7 th embodiment. Except that the inner wall of the cylinder does not have an inner groove 6. The siphon head 14 is mounted at one end on both sides of the sump and at the other end at a distance of about 2mm from the wall of the tank. Condensate is drawn into the siphoning sump 13 by the syphon 14. Its operation principle is the same as that of the aforementioned 7 th embodiment, so that its effect is also the same as that of the aforementioned 7 th embodiment. This embodiment is suitable for situations where the width of the drying cylinder is large or where it is not economical or convenient to machine the inner vat.

Claims

1. A novel drying cylinder of a rotary siphon device comprises a steam inlet (1), a shaft head (2), a cylinder cover (3), a central cylinder (4), a cylinder body (5), a siphon (8), a liquid collecting tank (9) and a condensed water outlet (12), and is characterized in that the liquid collecting tank (9) is of a structure with a strip-shaped siphon opening liquid collecting tank (16) provided with an air inlet (18) and a strip-shaped siphon opening (11) or of a structure with a siphon liquid collecting tank (13) provided with an air inlet (18) and a siphon suction head (14), the siphon (8) is approximately arranged at the middle symmetrical part of the liquid collecting tank (9), a siphon pipe expanding section (17) is arranged at the connecting part of the liquid collecting tank (9), the strip-shaped siphon opening (11) of the strip-shaped siphon opening liquid collecting tank (16) is opposite to the cylinder wall and is tightly pressed with the cylinder wall, the siphon liquid collecting tank (13) provided with the siphon suction head (14) is also tightly pressed with the cylinder wall, one end of the siphon suction head (14) is about 2mm away from the cylinder wall, condensate is sucked into the liquid collecting tank (9) from the cylinder wall or the inner groove (6), a side air inlet (10) is arranged on the liquid collecting tank (9), an air jet extending into the liquid collecting tank from the side air inlet (10) faces to the siphon axis of the siphon pipe (8), a middle air inlet (15) is arranged at the liquid collecting tank (9) and the flaring section (17), and the air jet extending into the groove from the middle air inlet (15) faces to the siphon axis of the siphon pipe (8).

2. A cylinder according to claim 1, characterized in that the inlet (18) is a central inlet (15) and a side inlet (10) provided in the sump (9).

3. A new cylinder of rotary siphon device, according to claim 1, characterized by the fact that the inlet (18) is the side inlet (10) and the intermediate inlet (15) of the tubular element mounted on the sump (9).

4. A new type of drying cylinder with rotary siphon device, according to claim 1, characterized by the fact that the inlet (18) is a side inlet (10) and a middle inlet (15) formed by the openings in the sump (9) or in the siphon (8), in the flared section (17) of the siphon.

5. A new cylinder of rotary siphon device, according to claims 2 and 3, characterized by the fact that the side intakes (10) are designed on the sump (9).

6. A cylinder according to claim 1, characterized in that the cylinder body (5) is provided with an internal groove (6).

7. A cylinder according to claim 1, characterized in that the cylinder body (5) is without an internal groove (6).

8. A cylinder according to claim 6, characterized by an inner groove (6) with a depth of 2-5 mm.