CN218460208U

CN218460208U - Cleaning structure of steam nozzle and self-cleaning condensation vacuum pump

Info

Publication number: CN218460208U
Application number: CN202221978777.1U
Authority: CN
Inventors: 傅立峰; 吴金亮; 张绍英; 张胜国; 潘洪良; 王明; 朱行峰
Original assignee: RONGSHENG PETROCHEMICAL CO Ltd
Current assignee: RONGSHENG PETROCHEMICAL CO Ltd
Priority date: 2022-07-28
Filing date: 2022-07-28
Publication date: 2023-02-10
Anticipated expiration: 2032-07-28

Abstract

The utility model discloses a cleaning structure of a steam nozzle, which belongs to the technical field of polyester vacuum systems and comprises an injection pipe and a cleaner, wherein both ends of the injection pipe are respectively provided with a working steam inlet and a mixed gas outlet, the working steam inlet is provided with a nozzle, the injection pipe is provided with a T-shaped tee joint at one end provided with the working steam inlet, the T-shaped tee joint comprises a first straight pipe, a second straight pipe and a bypass pipe, the first straight pipe is connected with the working steam inlet, the second straight pipe is connected with the cleaner, and the cleaner comprises a cleaning probe which moves in a reciprocating manner; the cleaning probe intermittently extends into the nozzle, deposited oligomer particles can be removed, the nozzle is prevented from being blocked, and the problem that in the prior art, the nozzle is easily blocked due to the deposition of the oligomer particles in the process of vacuumizing the ethylene glycol steam jet vacuum pump, and the normal operation of the device is influenced is solved.

Description

Cleaning structure of steam nozzle and self-cleaning condensation vacuum pump

Technical Field

The utility model belongs to the technical field of the polyester vacuum system technique and specifically relates to a clean structure and self-cleaning's condensation vacuum pump of steam nozzle is related to.

Background

Existing polyester production plants all employ multistage ethylene glycol steam jet vacuum pumps for vacuum pumping, the steam jet ejector being a device that uses high velocity jets through a nozzle to evacuate the gas in the vessel to achieve vacuum. The ethylene glycol steam jet vacuum pump is composed of a plurality of stages of ethylene glycol steam ejectors (hereinafter referred to as ejectors) which are connected in series, and a condenser is arranged in the middle of the vacuum pump. The ejector is formed by combining a suction chamber, a venturi tube and a laval nozzle in a certain manner.

In actual production, because ethylene glycol EG is recycled, ethylene glycol EG steam inevitably contains oligomer particles, the oligomer particles are firstly adsorbed and deposited at a position with a lower flow speed, the effective diameter of the throat part of the Laval nozzle is reduced along with accumulation of the oligomer, the flow of working steam (ethylene glycol steam) is reduced, the efficiency is reduced, the air suction quantity of an ejector is reduced, the required vacuum degree of rated load operation of a device cannot be met, the device is forced to reduce the yield and operate, finally, the device must be shut down, the blocked ethylene glycol steam nozzle is dredged, and the device can normally operate.

The low-load operation or the shutdown of the device can cause economic loss and does not meet the requirements of stable, reliable and long-period operation of the device.

For example, a "steam ejector disclosed in chinese patent document, whose publication number is CN204299976U, includes a mixing chamber, a throat and a diffuser pipe coaxially arranged in this order, the mixing chamber, the throat and the diffuser pipe are hermetically connected, the mixing chamber is provided with a working nozzle intake pipe and a backup nozzle intake pipe, the working nozzle intake pipe is communicated with the steam intake pipe, the backup nozzle intake pipe is communicated with the working nozzle intake pipe, a control component is arranged in the backup nozzle intake pipe, by arranging the working nozzle intake pipe and the backup nozzle intake pipe, in a normal working state, the pipe is in a closed state, the working nozzle intake pipe is connected, when the working nozzle intake pipe is blocked, the pipe pressure rises to push the piston open by the steam, the pipe is connected, the backup nozzle intake pipe is in a connected state, the use of the steam ejector is not affected, when the steam ejector stops working, the blocked nozzle intake pipe is repaired, time is not wasted, and the working efficiency is improved; the ejector has the defects that if the ejector is applied to a multistage ethylene glycol steam jet vacuum pump, due to the problem of low polymer particle deposition, a nozzle is easy to block, and the normal operation of the device is influenced.

SUMMERY OF THE UTILITY MODEL

The utility model relates to an overcome prior art, the in-process of ethylene glycol steam jet vacuum pump evacuation, its nozzle leads to blockking up by the oligomer granule deposit easily, influences the problem of device normal operating, provides a steam jet's clean structure and self-cleaning's condensation vacuum pump, can carry out self-cleaning to steam jet in operating condition to avoid blockking up, keep the stability of evacuation.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model relates to a cleaning structure of a steam nozzle, which comprises an injection pipe and a cleaner, wherein both ends of the injection pipe are respectively provided with a working steam inlet and a mixed gas outlet, the working steam inlet is provided with a nozzle, the side part of the injection pipe is provided with a suction gas inlet, the injection pipe is provided with a T-shaped tee joint at one end provided with the working steam inlet, the T-shaped tee joint comprises a first straight pipe, a second straight pipe and a bypass pipe, the first straight pipe is connected with the working steam inlet, the second straight pipe is connected with the cleaner, and the bypass pipe is connected with a steam gas source; the cleaner includes a reciprocating cleaning probe.

Through on installing three T type tee bend two straight-through pipes with steam work import and cleaner respectively, can be convenient for clean probe and aim at the nozzle, ethylene glycol steam passes through the bypass pipe and gets into the injection pipe, and in-process, partial oligomer granule can deposit in the throat of nozzle, and clean probe stretches into the nozzle through intermittent type nature, can get rid of the oligomer granule of deposit, avoids the nozzle to produce the jam.

Preferably, the end of the cleaning probe comprises a thick rod part and a thin rod part, the thin rod part is closer to one side facing the jet pipe relative to the thick rod part, the thin rod part mainly changes the steam flow rate by changing the flow area of the throat part of the nozzle, and then purging is carried out on the throat part of the nozzle, and the thick rod part is used for scraping off the scaling substances adsorbed on the throat part of the nozzle.

Preferably, the outer diameter of the thin rod part is less than half of the inner diameter of the nozzle throat, and the difference between the outer diameter of the thick rod part and the inner diameter of the nozzle throat is not more than 1mm.

Preferably, the cleaner comprises a stuffing sealing box, a linear bearing matched with the cleaning probe is arranged in the stuffing sealing box, and the linear bearing can improve the moving linearity of the cleaning probe and ensure that the cleaning probe can accurately extend into the nozzle.

Preferably, a sealing ball valve is further installed between the packing sealing box and the T-shaped tee joint, and the sealing ball valve isolates the vacuum system when the cleaning device is maintained, so that the cleaning device is maintained without stopping.

Preferably, a packing sealing mounting flange is arranged on the outer side of the packing sealing box, an outer ring bolt hole and an inner ring bolt hole are formed in the packing sealing mounting flange, the outer ring bolt hole is connected with a driving cylinder, and the inner ring bolt hole is connected with a sealing ball valve.

Preferably, a plurality of packing sealing rings are further installed in the packing sealing box, and the effect of improving the sealing effect is achieved.

Preferably, the packing gland for compressing the packing sealing ring is installed on one side of the packing sealing box back to the T-shaped tee joint, and when the packing ring is slightly worn, the compression ring can ensure that the packing gland is compressed, so that a gap is prevented from being generated between the packing glands.

The utility model provides an automatic clear condensation vacuum pump, includes foretell clean structure, still includes one-level condenser, second grade condenser, tertiary condenser, and one-level condenser and one-level cleaner are installed to the exit of one-level condenser, install second grade condenser pipe and second grade cleaner between one-level condenser and the second grade condenser, install tertiary condenser pipe and tertiary cleaner between second grade condenser and the tertiary condenser.

Therefore, the utility model discloses following beneficial effect has: (1) The linear reciprocating motion automatic cleaning probe is used for cleaning and dredging the steam nozzle of the ethylene glycol ejector, so that the phenomenon that the operation of the device is influenced by the blockage of the nozzle is avoided; (2) The device can clean and dredge the ethylene glycol steam nozzle on line without stopping and dismounting, and has no influence on production and quality: (3) The linear bearing is adopted to ensure that the sealing filler and the cleaning probe are concentric, the abrasion of the sealing filler is slowed down, and the service life of the sealing filler is prolonged; (4) The abrasion loss of the packing seal ring is compensated through the packing gland, so that long-time sealing is ensured.

Drawings

Fig. 1 is a schematic view of the cleaning structure of the present invention.

Fig. 2 is a schematic structural diagram of the injection pipe of the present invention.

Fig. 3 is a schematic top view of the packing seal mounting flange according to the present invention.

Fig. 4 is a schematic structural diagram of the condensation vacuum pump of the present invention.

In the figure:

1-1, 1-2 nozzles, 1-3 suction chambers, 2 injection pipes, 3T-shaped tee joints, 4 sealing ball valves, 5 packing sealing installation flanges, 6 packing sealing boxes, 7 linear bearings, 8 metal rings, 9 packing sealing rings, 10 packing gland covers, 11 hexagonal head bolts, 12 springs, 13 cleaning probes, 14 transmission sleeves, 15 first transmission pins, 16 second transmission pins, 17 single-acting cylinders and 17 long rod bolts; n1, a working steam inlet N2, a suction gas inlet N3 and a mixed gas outlet.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the detailed description.

In the embodiment shown in fig. 1-4, a cleaning structure of a steam nozzle comprises a spray pipe and a cleaner, wherein both ends of the spray pipe are respectively provided with a working steam inlet N1 and a mixed gas outlet N3, the working steam inlet is provided with a nozzle 1-1, the side part of the spray pipe is provided with a suction gas inlet N2, the spray pipe is provided with a T-shaped tee joint 2 at one end provided with the working steam inlet, the T-shaped tee joint comprises a first straight pipe, a second straight pipe and a bypass pipe, the first straight pipe is connected with the working steam inlet, the second straight pipe is connected with the cleaner, and the bypass pipe is connected with a steam gas source; the cleaner includes a reciprocating cleaning probe 12; the first straight-through pipe is fixedly connected with a flange on the nozzle through a fastening bolt, the second straight-through pipe is fixedly connected with a sealing ball valve 3 through a fastening bolt, and the other side of the sealing ball valve is connected with a packing sealing installation flange 4 with an automatic compensation function through a bolt; two circles of bolt holes are formed in the packing sealing mounting flange and used for being connected with a sealing ball valve, an outer circle of bolt holes are used for fixing a driving cylinder 16, and the driving cylinder is a single-action cylinder.

The cleaner also comprises a packing sealing box 5, and the packing sealing box and the packing sealing installation flange are welded into a whole; a stepped hole is formed in the stuffing sealing box; firstly, a linear bearing 6 is arranged in a stepped hole in the stuffing sealing box, and the linear bearing is firmly leaned against an inner step of the stepped hole of the stuffing sealing box; a cleaning probe is assembled at the center of the packing sealing box, the cleaning probe penetrates through the axis of the linear bearing, and the cleaning probe makes axial reciprocating linear motion; a metal ring 7 is arranged on the outer side of the linear bearing in the packing sealing box and sleeved on the cleaning probe; and a packing sealing ring 8 is arranged on the upper side of the metal ring, the packing sealing ring is sleeved on the cleaning probe, the dimensional tolerance of the cleaning probe is h7, and the surface roughness Ra0.8 is obtained. The sealing ring is used for keeping better sealing performance and reducing abrasion to the packing sealing ring; and a packing gland 9 is further installed on the upper side of the packing seal ring, the packing gland is connected and fastened with an upper flange of the packing seal box through a hexagon head bolt 10, a spring 11 is sleeved on the hexagon head bolt between the upper flange of the packing seal and a nut, and when the packing seal ring is slightly worn, the spring automatically tightens up and compensates the wear loss of the packing ring.

One end of the cleaning probe is provided with a round hole for transmission, and a transmission pin penetrates through the round hole to assemble the cleaning probe 12 and the transmission sleeve 13 together; the other end of the cleaning probe is in a step shape and comprises a thick rod part and a thin rod part, the thin rod part is closer to one side facing the jet pipe relative to the thick rod part, the head part is in a pointed shape, the length of the thin rod part is less than or equal to 10cm, the outer diameter of the thin rod part is smaller than half of the inner diameter of the nozzle throat part, and the flow velocity of steam is changed by mainly changing the flow area of the nozzle throat part to realize the purging of the nozzle throat part; the difference between the outer diameter of the thick rod part and the inner diameter of the throat part of the nozzle is about 0.5mm, and the thick rod part is used for scraping off the scale attached to the throat part of the nozzle.

The single-acting cylinder 16 is fixedly connected with the packing sealing mounting flange through a long rod bolt 17; the mandrel of the single-acting cylinder is connected with the transmission sleeve through transmission pins, and the transmission pins comprise a first transmission pin 14 and a second transmission pin 15; the single-acting cylinder admits air, and the cleaning probe moves towards the nozzle under the single-acting cylinder promotes, carries out to sweep, strikes off the operation to the throat of nozzle, and after the single-acting cylinder broke off gas, the cleaning probe was pulled by the single-acting cylinder and is moved to keeping away from the nozzle direction to get back to initial position.

The utility model provides an automatic clear condensation vacuum pump, still includes one-level condenser, second grade condenser, tertiary condenser, and one-level condenser and one-level cleaner are installed to the exit of one-level condenser, installs second grade condenser pipe and second grade cleaner between one-level condenser and the second grade condenser, installs tertiary condenser pipe and tertiary cleaner between second grade condenser and the tertiary condenser.

Claims

1. A cleaning structure of a steam nozzle is characterized by comprising a jet pipe and a cleaner, wherein a working steam inlet and a mixed gas outlet are respectively arranged at two ends of the jet pipe, the working steam inlet is provided with a nozzle, the side part of the jet pipe is provided with a suction gas inlet, the end of the jet pipe provided with the working steam inlet is provided with a T-shaped tee joint, the T-shaped tee joint comprises a first straight pipe, a second straight pipe and a bypass pipe, the first straight pipe is connected with the working steam inlet, the second straight pipe is connected with the cleaner, and the bypass pipe is connected with a steam gas source; the cleaner includes a reciprocating cleaning probe.

2. The steam nozzle cleaning structure as claimed in claim 1, wherein the end of the cleaning probe includes a thick shaft portion and a thin shaft portion, the thin shaft portion being located closer to a side toward the spray pipe than the thick shaft portion.

3. A cleaning structure for a steam nozzle as claimed in claim 2, wherein the outer diameter of the thin rod part is less than half of the inner diameter of the nozzle throat part, and the difference between the outer diameter of the thick rod part and the inner diameter of the nozzle throat part is not more than 1mm.

4. The steam nozzle cleaning structure as claimed in claim 1, wherein the cleaner includes a stuffing seal housing in which a linear bearing adapted to the cleaning probe is installed.

5. The cleaning structure for the steam nozzle as claimed in claim 4, wherein a sealing ball valve is further installed between the stuffing sealing box and the T-shaped tee.

6. The cleaning structure for the steam nozzle as claimed in claim 5, wherein a packing seal mounting flange is arranged on the outer side of the packing seal box, an outer ring bolt hole and an inner ring bolt hole are formed in the packing seal mounting flange, the outer ring bolt hole is connected with the driving cylinder, and the inner ring bolt hole is connected with the seal ball valve.

7. The cleaning structure of a steam nozzle as claimed in claim 4, wherein a plurality of packing rings are further installed in the packing gland.

8. The steam nozzle cleaning structure as recited in claim 7, wherein the stuffing seal box is provided with a stuffing gland for pressing the stuffing seal ring on a side facing away from the T-tee.

9. An automatic cleaning condensation vacuum pump, which comprises the cleaning structure of claim 1, and is characterized by further comprising a first-stage condenser, a second-stage condenser and a third-stage condenser, wherein a first-stage condensing pipe and a first-stage cleaner are arranged at the outlet of the first-stage condenser, a second-stage condensing pipe and a second-stage cleaner are arranged between the first-stage condenser and the second-stage condenser, and a third-stage condensing pipe and a third-stage cleaner are arranged between the second-stage condenser and the third-stage condenser.