Small-size and low-weight condensate pump for chemical offshore platform

Abstract

The utility model relates to a small-size low-weight condensate pump for a chemical offshore platform, which comprises a pump body provided with a horizontal inlet and a horizontal outlet, a pump cover connected above the pump body, and a pump shaft arranged between the pump body and the pump cover, a driving side bearing body and a non-driving side bearing body are arranged on the two sides of the pump shaft, the driving side bearing body and the non-driving side bearing body adopt a semi-flange plate form, the driving side bearing body adopts a radial bearing of a deep groove ball bearing, and the non-driving side bearing body adopts two thrust bearings which are arranged back to back and have angular contact ball bearing structures. The blades on the two sides of the impeller are arranged in a staggered mode, the main axial force in the operation process of the pump shaft can be balanced, the leakage phenomenon of the sealing face can be effectively prevented, the sealing effect is guaranteed, and the working efficiency of the pump is improved. And the bearing body adopts a semi-flange form, so that the vibration is further reduced, and the stable operation of the pump is ensured.

Description

Technical Field

[0001] The utility model relates to a condensate water pump, in particular to a small-size and low-weight condensate water pump for a chemical offshore platform with stable operation, high working efficiency and good sealing effect. Background Art

[0002] Condensate pumps are core equipment on offshore chemical platforms, responsible for the transportation and discharge of condensate throughout the platform. They primarily condense high-temperature steam into water, which is then transported to various equipment on the platform for cooling. These pumps operate continuously and for extended periods of time. Due to the limited space within offshore platforms and the associated weight requirements, and the increasing demands placed on the safety and reliability of platform equipment in both domestic and international markets, the technological development and application of circulating condensate pumps has accelerated.

[0003] The condensate pump is one of the core dynamic equipment on the chemical offshore platform. It guarantees the cooling of various equipment on the platform. Its main conveying medium is condensate. However, the condensate pumps on the current chemical offshore platform have the problems of large size and weight, limited space on the platform, and extremely high requirements for the safety and stable operation of the equipment on the platform. Therefore, it is of great significance to use a condensate pump with large flow, high efficiency, low vibration and stable operation to ensure the stable operation of the platform. Utility Model Content

[0004] In view of the above problems, the main purpose of the present invention is to provide a small-sized and low-weight condensate pump for chemical offshore platforms with stable operation, high working efficiency and good sealing effect.

[0005] The utility model solves the above technical problems through the following scheme: a small-size and low-weight condensate pump for a chemical offshore platform, the small-size and low-weight condensate pump for a chemical offshore platform comprising: a pump body provided with a horizontal inlet and a horizontal outlet, a pump cover connected to the top of the pump body, a pump shaft arranged between the pump body and the pump cover, a double-suction impeller connected to the middle of the pump shaft, the blades on both sides of the impeller are arranged alternately, a driving side bearing body and a non-driving side bearing body are arranged on both sides of the pump shaft, the driving side bearing body and the non-driving side bearing body adopt a semi-flange form, a mechanical seal is provided at the connection between the pump shaft and the pump cover, a first housing sealing ring is provided between the pump body and the pump cover, a first impeller sealing ring is provided on the impeller, an O-ring is provided at the connection between the pump body and the pump cover, the driving side bearing body adopts a radial bearing of a deep groove ball bearing, and the non-driving side bearing body adopts a thrust bearing with two angular contact ball bearing structures arranged back to back.

[0006] In a specific implementation example of the present invention, the impeller is mounted on the pump shaft in a sliding manner and is positioned and fixedly connected to the pump shaft through a half ring and a gear sleeve.

[0007] In a specific implementation example of the present invention, the pump body is made of A487 CA-6NM material, and the pump cover is made of A487 CA-6NM material.

[0008] In a specific implementation example of the present utility model, a second casing sealing ring and a second impeller sealing ring are respectively provided at the matching positions of the pump body and the pump cover with the impeller.

[0009] In a specific embodiment of the present invention, the first housing sealing ring and the second housing sealing ring are both sealing rings that have been tempered; the first impeller sealing ring and the second impeller sealing ring are both sealing rings that have been tempered and surface hardened.

[0010] In a specific implementation example of the present invention, the pump body, pump cover and impeller are all integrally cast.

[0011] In a specific implementation example of the present utility model, an oil slinger is provided on the pump shaft between the radial bearing and the thrust bearing, and oil cups are provided on the driving side bearing body and the non-driving side bearing body.

[0012] In a specific implementation example of the present utility model, a throat bushing is provided between the pump body, the pump cover and the pump shaft.

[0013] In a specific implementation example of the present invention, the mechanical seal is a container-type mechanical seal, the mechanical seal has a self-circulating flushing structure through a flushing pipeline, and the bottom of the pump body is connected to the discharge pipeline by welding.

[0014] In a specific implementation example of the present utility model, the flushing pipeline and the mechanical seal are connected via a flexible joint with sealing pipe threads, and two gate valves connected in series are provided on the discharge pipeline at the bottom of the pump body.

[0015] The positive progressive effect of the present invention is that, compared with common similar technologies, the small-size and low-weight condensate pump for chemical offshore platforms provided by the present invention adopts a single-stage double-suction closed impeller with blades on both sides of the impeller arranged alternately, which can balance the main axial force of the pump shaft during operation, and bear the residual axial force through the thrust bearing, thereby preventing vibration caused by pressure pulsation and enhancing the stability of the pump during operation.

[0016] The utility model is provided with sealing rings at the joints between the impeller and the pump body and the pump cover, which can play the role of throttling and reducing pressure. The deep groove ball bearing used in the radial bearing that plays a supporting role has a small friction coefficient with the pump shaft in point contact, which can further improve the high-speed and stable operation of the pump and improve the working efficiency of the pump.

[0017] The utility model provides an O-ring at the connection between the pump body and the pump cover, which can effectively prevent the occurrence of leakage on the sealing surface, ensure the sealing effect, and improve the working efficiency of the pump.

[0018] The bearing body of the utility model adopts a semi-flange form, which further reduces vibration and ensures the stable operation of the pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a cross-sectional view of the overall structure of the utility model.

[0020] Figure 2 It is a left view of the present utility model.

[0021] The following are the names corresponding to the bid numbers in this utility model:

[0022] Pump shaft (1), drive side bearing body (2), radial bearing (3), mechanical seal (4), pump cover (5), O-ring (6), pump body (7), throat bushing (8), first housing seal ring (9), first impeller seal ring (10), double suction impeller (11), second housing seal ring (12), second impeller seal ring (13), split ring (14), gear sleeve (15), non-drive side bearing body (16), thrust bearing (17), oil slinger (18), oil cup (19). DETAILED DESCRIPTION

[0023] The preferred embodiments of the present invention are given below in conjunction with the accompanying drawings to illustrate the technical solutions of the present invention in detail.

[0024] Figure 1 This is a cross-sectional view of the overall structure of the utility model. Figure 2 It is the left view of the utility model, as shown in FIG. Figure 1-2As shown in the figure, an embodiment of the present invention provides a small, low-weight condensate pump for offshore chemical platforms. The pump body 7 comprises a pump body 7, which is an axially split single volute supported near the centerline. The inlet and outlet of the pump body 7 are both arranged horizontally. A pump cover is connected to the top of the pump body 7, and a pump shaft 1 passes through the center of the pump body and the pump cover. A double-suction impeller 11 is connected to the middle of the pump shaft 1 within the pump body 7 (in a specific embodiment, the double-suction impeller can be a single-stage, double-suction, closed impeller). The double-suction impeller 11 is slip-fitted onto the pump shaft 1 and is fixedly connected to the pump shaft 1 via a pillow block, a half ring 14, and a gear sleeve 15. The double-suction impeller 11 can absorb the primary axial forces during operation of the pump shaft 1. A drive-side bearing 2 and a non-drive-side bearing 16 are respectively provided at each end of the pump shaft 1. The drive-side bearing 2 includes a radial bearing 3, and the non-drive-side bearing 16 includes a thrust bearing 17. The radial bearing 3 utilizes a deep-groove ball bearing. Deep-groove ball bearings form point contact with the rail, resulting in a low friction coefficient suitable for high-speed and stable operation of the pump. The thrust bearing 17 utilizes two angular contact ball bearings arranged back-to-back. The staggered blades on both sides of the double-suction impeller 11 prevent pressure pulsation. The double-suction impeller 11 bears the primary axial force, while the thrust bearing 17 bears the residual axial force, thereby enhancing the pump's stability. The pump body 7 and pump cover 5 are respectively provided with a first casing sealing ring 9 and a first impeller sealing ring 10 at their respective locations with the double-suction impeller 11. The pump body 7 and pump cover 5 are also respectively provided with a second casing sealing ring 12 and a second impeller sealing ring 13 at their respective locations with the double-suction impeller 11, providing a throttling and pressure-reducing effect. Furthermore, the first and second casing sealing rings 9 and 12, as well as the first and second impeller sealing rings 10 and 13, undergo tempering and surface hardening to achieve different friction pair surface hardnesses, making the pump safer and more stable during operation. The connection surface between the pump body 7 and the pump cover 5 is provided with threaded holes, and the connection surface between the pump cover 5 and the pump body 7 is provided with through holes that match the threaded holes in the pump body 7. The pump body 7 and the pump cover 5 are connected together by studs and nuts through the threaded holes and through holes. In addition, an O-ring 6 is provided at the connection between the pump body 7 and the pump cover 5 for sealing. The O-ring 6 can effectively prevent leakage from the sealing surface of the pump body 7 and the pump cover 5. To facilitate the removal of the pump cover 5 during maintenance, a top screw hole is provided on the pump cover 5. At the same time, a throat bushing 8 is provided between the pump shaft 1 and the pump body and pump cover 5 to provide a throttling effect. In order to seal the entire pump and ensure the pump's sealing performance, a mechanical seal 4 is provided at the contact point between the pump shaft 1, the pump body, and the pump cover 5.

[0025] The drive-side bearing 2 and the non-drive-side bearing 16 are equipped with oil cups 19. A sufficient amount of lubricating oil is added to the oil cups 19 through a one-time lubrication process. The pump shaft 1 is equipped with an oil slinger 18. The rotation of the pump shaft 1 drives the oil slinger 18 to throw oil from the drive-side bearing 2 and the non-drive-side bearing 16, achieving self-lubrication. Furthermore, the oil cups 19 automatically replenish oil into the bearings based on their own oil level, ensuring automatic lubrication of the drive-side bearing 2 and the non-drive-side bearing 16, ensuring long-term normal operation of the pump.

[0026] The pump body 7 and pump cover 5 are constructed from A487 CA-6NM, the double-suction impeller 11 from A743 CA-6NM, the casing seal ring 9 from 1Cr13MoS, the first impeller seal ring 10 and the second casing seal ring 12 from 3Cr13, the pump shaft 1 from 30Cr13, and the drive-side bearing 2 and non-drive-side bearing 16 from ZG230-450. This enhances the pump's corrosion resistance and ensures its service life. Furthermore, the pump body 7, pump cover 5, and double-suction impeller 11 are integrally cast using a precision casting process, resulting in structurally optimized, integral flow channel dimensional accuracy and a high degree of finish, improving pump efficiency and ensuring the performance and user satisfaction.

[0027] The mechanical seal 4 is flushed using a self-circulating flushing method, which allows the pumped medium to flush the seal, preventing any leaks and potential hazards. The flushing line is connected to the mechanical seal 4 via a union with sealing pipe threads. The flushing line is equipped with a flange connection and a throttling orifice. The bottom of the pump body 7 is welded to the discharge line, which is equipped with two gate valves connected in series. During normal operation, the gate valves are closed. To drain the liquid from the pump body 7 during maintenance, the two closed gate valves can be opened to completely drain the liquid from the pump body 7.

[0028] The embodiment of the present invention provides a small-sized, low-weight condensate pump for a chemical offshore platform, and its working principle is as follows: the circulating water pump provided by the present invention is an axially split horizontal single-stage double-suction single-volute centrifugal pump, the driving side of the pump is directly connected to the motor via an elastic diaphragm coupling, wherein the pump and the motor are assembled together on the same joint base. During operation, the condensate delivery pipeline of the device is connected to the pump inlet via an inlet flange, and the condensate enters the pump body 7 from the inlet. The motor drives the pump shaft 1 to run at high speed, and the pump shaft 1 drives the impeller in the middle to rotate at high speed. The condensate entering the pump body 7 is discharged from the outlet of the pump body 7 after being pressurized, and is delivered to various devices on the platform for cooling through the condensate outlet pipeline. Then the high-temperature medium returns to the condenser to continue circulating, thereby achieving the purpose of cooling the equipment.

[0029] The embodiment of the present utility model provides a small-sized and low-weight condensate water pump for chemical offshore platforms. It has high-speed and stable operation, high working efficiency, low vibration, good sealing effect, strong corrosion resistance and wear resistance, and long service life. It ensures the long-term use and continuous operation of the equipment, and also provides reliable protection for the cooling of equipment in the platform. It can be widely used in condensate water circulation projects of chemical offshore platforms.

[0030] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for illustrative purposes. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements shall fall within the scope of the present invention as claimed, and the scope of protection claimed by the present invention shall be defined by the appended claims and their equivalents.

Claims

1. A small-size, low-weight condensate pump for a chemical offshore platform, characterized by: The small-size, low-weight condensate pump for a chemical offshore platform includes: a pump body provided with a horizontal inlet and a horizontal outlet, a pump cover connected to the top of the pump body, a pump shaft arranged between the pump body and the pump cover, a double-suction impeller connected to the middle of the pump shaft, blades on both sides of the impeller are arranged alternately, a driving side bearing body and a non-driving side bearing body are arranged on both sides of the pump shaft, the driving side bearing body and the non-driving side bearing body are in the form of a semi-flange, a mechanical seal is provided at the connection between the pump shaft and the pump cover, a first housing sealing ring is provided between the pump body and the pump cover, a first impeller sealing ring is provided on the impeller, an O-ring is provided at the connection between the pump body and the pump cover, the driving side bearing body adopts a radial bearing of a deep groove ball bearing, and the non-driving side bearing body adopts a thrust bearing with two angular contact ball bearing structures arranged back to back.

2. The small-size, low-weight condensate pump for a chemical offshore platform according to claim 1, characterized in that: The impeller is sleeved on the pump shaft in a sliding manner and is positioned and fixedly connected to the pump shaft through a half ring and a gear sleeve.

3. The small-size, low-weight condensate pump for a chemical offshore platform according to claim 1 or 2, characterized in that: The pump body is made of A487 CA-6NM material, and the pump cover is made of A487 CA-6NM material.

4. The small-size, low-weight condensate pump for a chemical offshore platform according to claim 2, characterized in that: The matching positions of the pump body, the pump cover and the impeller are respectively provided with a second casing sealing ring and a second impeller sealing ring.

5. The small-size, low-weight condensate pump for a chemical offshore platform according to claim 4, characterized in that: The first casing sealing ring and the second casing sealing ring are both sealing rings that have undergone quenching and tempering treatment; the first impeller sealing ring and the second impeller sealing ring are both sealing rings that have undergone quenching and tempering treatment and surface quenching treatment.

6. The small-size, low-weight condensate pump for a chemical offshore platform according to claim 1, characterized in that: The pump body, pump cover and impeller are all cast as a whole.

7. The small-size, low-weight condensate pump for a chemical offshore platform according to claim 2, characterized in that: An oil slinger is arranged on the pump shaft between the radial bearing and the thrust bearing, and oil cups are arranged on the driving side bearing body and the non-driving side bearing body.

8. The small-size, low-weight condensate pump for a chemical offshore platform according to claim 1, characterized in that: A throat bushing is arranged between the pump body, the pump cover and the pump shaft.

9. The small-size, low-weight condensate pump for a chemical offshore platform according to claim 1, characterized in that: The mechanical seal is a container-type mechanical seal, and the mechanical seal has a self-circulating flushing structure through a flushing pipeline. The bottom of the pump body is connected to the discharge pipeline in a welding manner.

10. The small-size, low-weight condensate pump for a chemical offshore platform according to claim 9, characterized in that: The flushing pipeline and the mechanical seal are connected via a flexible joint with sealing pipe threads, and two gate valves connected in series are arranged on the discharge pipeline at the bottom of the pump body.

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