CN114370395A

CN114370395A - Full heat-insulation double-suction double-screw liquid sulfur pump

Info

Publication number: CN114370395A
Application number: CN202210018302.6A
Authority: CN
Inventors: 赵育基; 曹绍军; 邱霞; 张春花; 王满生; 李微
Original assignee: Jiangxi Xinde Industry Pump Co ltd
Current assignee: Jiangxi Xinde Industry Pump Co ltd
Priority date: 2022-01-07
Filing date: 2022-01-07
Publication date: 2022-04-19

Abstract

The invention discloses a full-heat-preservation double-screw liquid sulfur pump, which belongs to the technical field of conveying pumps. The liquid sulfur pump has a continuous heat preservation function, can prevent liquid sulfur from solidifying, and has better sealing performance.

Description

Full heat-insulation double-suction double-screw liquid sulfur pump

Technical Field

The invention relates to the technical field of delivery pumps, in particular to a full-heat-preservation double-suction double-screw liquid sulfur pump.

Background

In the petrochemical industry, the transmission of liquid sulfur is mostly carried out through a double-suction double-screw pump, the double-suction double-screw pump is a sealed cavity with constant volume formed between a screw sleeve and a pump body or a lining, the screw sleeve and the pump body are mutually meshed on a driving shaft and a driven shaft, a medium is respectively conveyed to the middle of the pump body along with the rotation of the screw shaft, the medium and the pump body are combined together, and finally the medium is conveyed to an outlet of the pump, so that the purpose of conveying the pump is realized. The melting point of sulfur is 112.8 ℃, liquid sulfur is easy to solidify in the conveying process, for one pump, the position of a sealing part is often the most easily-leaked part, and once the liquid sulfur leaks from a pump body, the liquid sulfur can be quickly solidified to damage the sealing part of the pump body, so that the liquid sulfur pump with the continuous heat preservation function, the liquid sulfur solidification prevention function and the better sealing property is needed in the market.

Disclosure of Invention

Aiming at the problems in the prior art, the invention aims to provide a liquid sulfur pump which has the functions of keeping the temperature continuously, preventing the solidification of liquid sulfur and having better sealing property.

The technical purpose of the invention is realized by the following technical scheme: the full-heat-insulation double-screw liquid sulfur pump comprises a pump body, wherein two sides of the pump body are respectively provided with a pump side plate, the pump body is provided with a feeding connecting pipe and a discharging connecting pipe, the pump body is internally provided with two mutually matched screw rods, two ends of each screw rod are respectively and integrally provided with a screw rod connecting shaft which penetrates through the pump side plates and extends outwards, two sides of the pump body are respectively provided with a mechanical seal seat, a heat cavity is arranged in each mechanical seal seat, each heat cavity is formed by two mutually intersected and communicated cylindrical cavities, the mechanical seal seat is communicated with two mutually independent through channels with the inner diameter smaller than that of each cylindrical cavity along the axes of the two cylindrical cavities, seamless pipes are embedded in the two through channels, the interiors of the seamless pipes are not communicated with the heat cavities, and the mechanical seal seat is provided with a plurality of communicating holes which are communicated with the heat cavities and the outside, the communicating hole is externally connected with a steam transmission mechanism; every mechanical seal seat all is through its two the passageway is established simultaneously to run through the cover and is located two of pump body one side the even axon of screw rod is last, two the seamless pipe also establishes respectively two the even axon of screw rod is last, just the even axon of screw rod is located the inboard position department cover of passageway is equipped with mechanical seal.

In some embodiments, the steam delivery mechanism includes a first steam main pipe, two first steam branch pipes branching from the first steam main pipe, a second steam main pipe, and two second steam branch pipes branching from the second steam main pipe, and the two first steam branch pipes and the two second steam branch pipes are respectively connected to the communication holes on the two mechanical seal seats.

In some embodiments, a connecting plate is tightly attached between the mechanical seal seat and the pump side plate, and the edges of the mechanical seal seat and the pump side plate are arranged in a step shape.

In some embodiments, the contact part of the mechanical sealing seat far away from the shaft of the screw body and the connecting plate is provided with an outer positioning ring in a sealing mode.

In some embodiments, an inner positioning ring is arranged at the contact part of the connecting plate close to one side of the shaft of the screw rod body and the pump side plate in a sealing mode.

In some embodiments, the shaft of the screw rod connector is a multi-section structure with the same axis, the outer diameters of adjacent sections are different, the edges between the adjacent sections are in a step shape, a limit ring is sleeved on the shaft of the screw rod connector, and the limit ring is clamped between the step-shaped structure on the outer surface of the shaft of the screw rod connector and the mechanical seal.

In some embodiments, the pump side plate, the mechanical seal mount, and the mechanical seal are disposed at a low pressure end of the pump body.

In some embodiments, the seamless pipe is a seamless steel pipe.

In conclusion, the invention has the following beneficial effects:

this kind of full heat preservation double-screw liquid sulfur pump that inhales, be equipped with mechanical seal seat and set up mechanical seal in mechanical seal seat's inboard, can effectively promote the conjuncted axle of screw rod and run through the leakproofness at pump body position, and still set up the hot chamber and set up seamless pipe in mechanical seal seat, guarantee to last the high temperature that keeps in the hot chamber through to heat intracavity input steam, seamless pipe has played sealed effect during, with the steam leakage in the heat-proof chamber, and seamless pipe has still played the effect of heat conduction, make the position that is located the conjuncted axle of screw rod and the conjuncted axle of seamless intraductal side and runs through the pump body remain throughout the high temperature that is higher than the liquid sulfur freezing point, the during operation lasts to the heat intracavity steam of carrying, realize keeping warm to the sealed position of pump body, prevent to solidify the sealing member who damages the pump body because of liquid sulfur.

Drawings

FIG. 1 is a front view of the present invention;

FIG. 2 is a left side view (partially in section) of the present invention;

FIG. 3 is a sectional view of the structure of FIG. 1A-A;

FIG. 4 is an enlarged view of FIG. 3B;

FIG. 5 is an isometric view of the mechanical seal carrier of the present invention;

FIG. 6 is a sectional view of the tube shown in FIG. 5C-C (when a seamless tube is provided in the mechanical seal holder);

fig. 7 is a sectional view at the position of fig. 5C-C (when no seamless pipe is provided in the mechanical seal holder).

In the figure: 1. a pump body; 2. a feeding pipe connection; 3. a discharging connecting pipe; 4. a screw; 5. a pump side plate; 6. a connecting plate; 7. an outer positioning ring; 8. a mechanical seal seat; 801. a seamless pipe; 802. a thermal chamber; 803. a communicating hole; 9. a first steam main; 10. a first steam branch pipe; 11. a second steam main; 12. a second steam branch pipe; 13. a screw rod integrated shaft; 14. an inner positioning ring; 15. a limiting ring; 16. and (4) mechanically sealing.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-7, a full heat-preservation double-screw liquid sulfur pump includes a pump body 1, two sides of the pump body 1 are respectively provided with a pump side plate 5, the pump body 1 is provided with a feeding connection pipe 2 and a discharging connection pipe 3, the pump body 1 is further provided with two screw rods 4 which are mutually matched, two ends of each screw rod 4 are respectively and integrally provided with a screw rod connection shaft 13 which penetrates through the pump side plate 5 and extends outwards, one of the two screw rods 4 is a driving rod, the other screw rod is a driven rod (as shown in fig. 3), and the screw rod connection shaft 13 is integrally provided with a pump key, when in use, the pump key can be driven by a motor to rotate, so that the screw rod connection shaft 13 on the screw rod 4 as the driving rod rotates, and then the screw rod 4 as the driving rod rotates, meanwhile, the driving screw rod 4 drives the other driven screw rod 4 to rotate, at this time, the liquid sulfur can be sucked into a pump cavity of the pump body 1 through the feeding connection pipe 2, under the transmission action of the screw rod 4, the liquid sulfur in the pump cavity is conveyed to the outside of the pump cavity along the discharge connecting pipe 3 to realize the transmission of the liquid sulfur, and it needs to be explained here that the transmission of the liquid sulfur needs to be performed in an environment higher than the solidification temperature of the liquid sulfur, so the temperatures in the feeding connecting pipe 2, the discharge connecting pipe 3 and the pump body 1 need to be higher than 112.8 ℃, the heating in the pump belongs to the conventional technology, therefore, the technical scheme, the principle and the structure of the heating in the pump are not repeated in the application, the mechanical sealing seats 8 are also installed on both sides of the pump body 1, as shown in fig. 5-7, a thermal cavity 802 is opened inside the mechanical sealing seat 8, the thermal cavity 802 is composed of two cylindrical cavities which are communicated with each other, the mechanical sealing seat 8 is opened with two mutually independent through channels with inner diameters smaller than the cylindrical cavities along the axes of the two cavities, and a seamless pipe 801 is embedded in the two through channels, an 8-shaped cavity communicated with the inner wall of the heat cavity 802 and the outer walls of the two seamless pipes 801 is formed, the interior of the seamless pipes 801 is not communicated with the heat cavity 802, a plurality of communication holes 803 for communicating the heat cavity 802 with the outside are formed in the mechanical sealing seat 8, the communication holes 803 are externally connected with a steam transmission mechanism, the steam transmission mechanism can transmit steam into the 8-shaped cavity, and water steam with 0.4MPa and 140 ℃ is preferably adopted; each mechanical seal seat 8 is simultaneously sleeved on the two screw connecting shaft bodies 13 positioned on one side of the pump body 1 through the two through passages, the two seamless pipes 801 are respectively sleeved on the two screw connecting shaft bodies 13, and the mechanical seal 16 is sleeved at the position of the screw connecting shaft body 13 positioned on the inner side of the through passage.

Through the technical scheme, the full heat-preservation double-screw 4-liquid sulfur pump is provided with the mechanical seal seat 8, the mechanical seal is arranged on the inner side of the mechanical seal seat 8, the sealing performance of the part, penetrating through the pump body 1, of the screw connecting shaft 13 can be effectively improved, the liquid sulfur is prevented from leaking from the part, penetrating through the pump body 1, of the screw connecting shaft 13, a heat cavity 802 is further arranged in the mechanical seal seat 8, a seamless pipe 801 is further arranged in the mechanical seal seat 8, the seamless pipe 801 is fixedly arranged in the mechanical seal seat 8 in a welding mode, the seamless pipe 801 is preferably a seamless steel pipe, the seamless steel pipe is high in strength and good in heat conduction effect, the high temperature in the heat cavity 802 is ensured to be continuously kept by inputting steam into the heat cavity 802, specifically, the steam transmission mechanism inputs 0.4MPa and 140 ℃ steam into the heat cavity 802 through a communication hole 803 on the mechanical seal seat 8, the steam is output outwards through the steam transmission mechanism after transferring heat in the heat cavity 802, thus, the continuous heat preservation of the thermal cavity 802 is realized by continuously inputting the steam, and under the action of heat conduction, the thermal cavity 802 keeps high temperature, so that the seamless pipe 801, the mechanical seal seat 8, the mechanical seal 16, the screw connection shaft 13, the pump side plate 5 and the pump body 1 are kept at high temperature, the heat preservation mode belongs to the heat preservation outside the pump, which is the comprehensive continuous heat preservation aiming at the sealing part which is easy to leak liquid sulfur, during which the seamless pipe 801 plays the role of sealing to prevent the steam in the heat cavity 802 from leaking, the seamless pipe 801 has a heat conduction function, so that the positions of the screw connection shaft 13 and the screw connection shaft 13 which are positioned inside the seamless pipe 801 and penetrate through the pump body 1 are always kept at a high temperature higher than the solidification point of liquid sulfur, steam is continuously conveyed into the hot cavity 802 during operation, the continuous heat preservation of the sealing position of the pump body 1 is realized, and the sealing part of the pump body 1 is prevented from being damaged due to the solidification of the liquid sulfur.

In some embodiments, as shown in fig. 1 and fig. 2, the steam delivery mechanism includes a first steam main pipe 9, two first steam branch pipes 10 branching from the first steam main pipe 9, a second steam main pipe 11, and two second steam branch pipes 12 branching from the second steam main pipe 11, where the two first steam branch pipes 10 and the two second steam branch pipes 12 are respectively connected to the communication holes 803 of the two mechanical seal seats 8, and when in use, the delivery path of steam is: the first steam main pipe 9 → two first steam branch pipes 10 → two communication holes 803 on two mechanical seal holders 8 → the thermal chamber 802 → the other two communication holes 803 on two mechanical seal holders 8 → two second steam branch pipes 12 → the second steam main pipe 11, or: the second steam main pipe 11 → two second steam branch pipes 12 → two communication holes 803 on two mechanical seal seats 8 → the thermal chamber 802 → the other two communication holes 803 on two mechanical seal seats 8 → two first steam branch pipes 10 → the first steam main pipe 9, and the steam can be transmitted in two directions to meet different transmission requirements.

In some embodiments, as shown in fig. 1, 3 and 4, the connecting plate 6 is tightly attached between the mechanical seal seat 8 and the pump side plate 5, edges of the three are arranged in a step shape, the three can be fixed by bolts, after the bolts are unscrewed, the three can be freely detached, and the connecting plate 6 plays a role in adaptive transition, so that seamless connection between the pump side plate 5 and the mechanical seal seat 8 is ensured.

In some embodiments, as shown in fig. 1, 3 and 4, an outer positioning ring 7 is hermetically disposed at a contact position between the mechanical seal seat 8 and the connection plate 6 on a side away from the shaft 13 of the screw coupling, an inner positioning ring 14 is hermetically disposed at a contact position between the connection plate 6 and the pump side plate 5 on a side close to the shaft 13 of the screw coupling, and the two positioning rings respectively perform further sealing actions on joints between the mechanical seal seat 8 and the connection plate 6 and between the connection plate 6 and the pump side plate 5, but the positioning rings also have a good stable positioning action, and can be adaptively adjusted according to the shape or inner shape of the pump side plate 5, the connection plate 6 or the mechanical seal seat 8, so as to achieve an effect of enhancing the positioning of the pump side plate 5, the connection plate 6 and the mechanical seal seat 8.

In some embodiments, as shown in fig. 3 and 4, the shaft 13 is a multi-section structure with the same axis, the outer diameters of adjacent sections are different, the edges between adjacent sections are stepped, a limiting ring 15 is sleeved on the shaft 13, the limiting ring 15 is clamped between the stepped structure on the outer surface of the shaft 13 and the mechanical seal 16, and the limiting ring 15 plays a role in limiting the mechanical seal 16 by extrusion, thereby further ensuring the stable installation of the mechanical seal 16.

In some embodiments, the pump side plate 5, the mechanical seal seat 8 and the mechanical seal 16 are all disposed at the low-pressure end of the pump body 1, so that during operation of the pump, even if impurities in the medium enter the mechanical seal friction pair, the impurities are sucked into the pump cavity by negative pressure without leakage, thereby further improving the leakage-proof performance of the liquid sulfur pump.

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.

Claims

1. Full heat preservation double-screw liquid sulfur pump, including the pump body (1), the both sides of the pump body (1) all are equipped with pump curb plate (5), it takes over (2) and ejection of compact takeover (3) to be equipped with the feeding on the pump body (1), still be equipped with two screw rods (4) of mutually supporting in the pump body (1), the both ends of screw rod (4) are all integrative to be equipped with and run through pump curb plate (5) and outside screw rod shaft (13) that extend, its characterized in that:

the pump comprises a pump body (1) and is characterized in that mechanical sealing seats (8) are further mounted on two sides of the pump body (1), a thermal cavity (802) is formed in the mechanical sealing seats (8), the thermal cavity (802) is formed by two cylindrical cavities which are communicated in an intersecting manner, the mechanical sealing seats (8) are provided with two through channels which are smaller than the cylindrical cavities in inner diameter and are independent from each other along the axes of the two cylindrical cavities, seamless pipes (801) are embedded in the two through channels, the interior of each seamless pipe (801) is not communicated with the thermal cavity (802), a plurality of communicating holes (803) which are communicated with the thermal cavity (802) and the outside are formed in the mechanical sealing seats (8), and steam transmission mechanisms are externally connected with the communicating holes (803);

every mechanical seal seat (8) all through its two it overlaps simultaneously to establish and is located to run through the passageway two of pump body (1) one side on the even axle of screw rod (13), two seamless pipe (801) are established respectively also and are established two on the even axle of screw rod (13), just the even axle of screw rod (13) are located it is equipped with mechanical seal (16) to run through the inboard position department cover of passageway.

2. The full heat-preservation double-suction twin-screw liquid sulfur pump according to claim 1, characterized in that: steam transmission device includes a first steam main pipe (9), as two first steam branch pipes (10), a second steam main pipe (11) of first steam main pipe (9) branch and as two second steam branch pipes (12) of second steam main pipe (11) branch, two first steam branch pipes (10) and two second steam branch pipes (12) are equallyd divide respectively with two on mechanical seal seat (8) intercommunicating pore (803) are connected.

3. The full heat-preservation double-suction twin-screw liquid sulfur pump according to claim 1, characterized in that: and a connecting plate (6) is tightly attached between the mechanical sealing seat (8) and the pump side plate (5), and the edges of the mechanical sealing seat, the pump side plate and the pump side plate are arranged in a step shape.

4. The full heat-preservation double-suction twin-screw liquid sulfur pump according to claim 3, characterized in that: an outer positioning ring (7) is arranged at the contact position of the mechanical sealing seat (8) and the connecting plate (6) far away from one side of the screw rod integrated shaft (13) in a sealing mode.

5. The full heat-preservation double-suction twin-screw liquid sulfur pump according to claim 3, characterized in that: an inner positioning ring (14) is hermetically arranged at the contact part of the connecting plate (6) close to one side of the screw rod integrated shaft (13) and the pump side plate (5).

6. The full heat-preservation double-suction twin-screw liquid sulfur pump according to claim 1, characterized in that: the integrated shaft of screw rod (13) is the multisection structure of coaxial center, and the external diameter between the adjacent festival is all inequality, and the edge between the adjacent festival is the echelonment, the cover is equipped with spacing ring (15) on the integrated shaft of screw rod (13), spacing ring (15) are pressed from both sides the apparent echelonment structure of integrated shaft of screw rod (13) with between mechanical seal (16).

7. The full heat-preservation double-suction twin-screw liquid sulfur pump according to claim 1, characterized in that: the pump side plate (5), the mechanical seal seat (8) and the mechanical seal (16) are arranged at the low-pressure end of the pump body (1).

8. The full heat-preservation double-suction twin-screw liquid sulfur pump according to claim 1, characterized in that: the seamless pipe (801) is a seamless steel pipe.