A high-temperature and high-pressure resistant centrifugal pump structure

Abstract

The utility model relates to centrifugal pump technical field discloses a kind of high-temperature and high-pressure resistant centrifugal pump structure, including shell, pump body, cover and main shaft, impeller is installed in pump body, impeller is closed impeller, main shaft passes through shell and is connected with impeller inside pump body, the airtight heat dissipation cavity between pump body outside and shell, cover is formed;Shell rear side is equipped with positioning shell body, main shaft is positioned inside positioning shell body by bearing component, and positioning shell body side wall front part is equipped with multiple groups of heat dissipation ports.The utility model has the advantages compared with prior art in that: it has efficient heat dissipation and thermal isolation: effectively prevent heat transfer to external key components.The structure is firm and wear-resistant, which greatly improves the anti-wear ability and running stability of the pump when conveying solid particle medium.

Description

Technical Field

[0001] This utility model relates to the field of centrifugal pump technology, specifically to a centrifugal pump structure resistant to high temperature and high pressure. Background Technology

[0002] In industries such as petrochemicals, coal chemicals, pharmaceuticals, and metallurgy, it is often necessary to transport media that are high-temperature, high-pressure, and contain a certain amount of solid particles. For example, heat transfer pumps, boiler feed pumps, and slurry pumps operate under extremely demanding conditions. Conventional centrifugal pumps face numerous challenges when operating under these conditions:

[0003] High temperature issues: can lead to a decrease in the strength of the pump body material, resulting in uneven thermal expansion that causes deformation and jamming, while also accelerating the aging and failure of seals and lubricating oil.

[0004] High pressure issues: This places extremely high demands on the pump body's pressure resistance, the tightness of the connecting parts, and the sealing performance of the shaft seal, making it prone to leakage and structural damage.

[0005] Wear problem: Solid particles in the medium will severely erode and abrade the impeller, pump body and other flow-through components, and aggravate the wear of the shaft seal, resulting in a rapid decrease in pump efficiency and a shortened lifespan.

[0006] Existing single-layer shell centrifugal pumps have poor thermal insulation and are unable to withstand high pressure and thermal shock; ordinary mechanical seals are prone to failure under high temperature and particulate media; and ordinary impeller and structural designs cannot take into account strength, wear resistance and thermal deformation control.

[0007] Therefore, there is an urgent need for a high-efficiency centrifugal pump that integrates high temperature resistance, high pressure resistance, and wear resistance. Utility Model Content

[0008] I. Technical problems to be solved

[0009] The technical problem to be solved by this utility model is that single-layer shell centrifugal pumps have poor heat insulation effect and are difficult to withstand high pressure and thermal shock. Ordinary impeller and structural designs cannot take into account strength, wear resistance and thermal deformation control.

[0010] II. Technical Solution

[0011] To solve the above-mentioned technical problems, the technical solution provided by this utility model is as follows: a centrifugal pump structure with high temperature and high pressure resistance, including a shell, a pump body disposed inside the shell, a cover body connected to the shell, and a main shaft, wherein a feed pipe is connected between the cover body and the pump body, and a discharge pipe is connected between the side wall of the shell and the pump body.

[0012] An impeller is installed inside the pump body. The impeller is a closed impeller. The main shaft passes through the outer shell and into the pump body to connect with the impeller. A sealed heat dissipation cavity is formed between the outer side of the pump body, the outer shell, and the cover. Cooling oil is injected into the heat dissipation cavity.

[0013] A positioning housing is installed on the rear side of the outer casing. The main shaft passes through the positioning housing and is positioned by bearing components. Multiple heat dissipation vents are provided on the front side wall of the positioning housing.

[0014] As an improvement, the main shaft is provided with a replaceable bushing at the part passing through the pump body, and the surface of the bushing is hardened.

[0015] As an improvement, a drive motor is connected to the tail end of the spindle via a connecting shaft.

[0016] As an improvement, the impeller is made of heat-resistant and wear-resistant duplex stainless steel and has undergone high-precision dynamic balancing.

[0017] As an improvement, the pump body recess and the inlet ring are inlaid or overlaid with a hard alloy wear-resistant layer.

[0018] As an improvement, two sets of liquid guide pipes connected to the heat dissipation cavity are respectively installed on the outer shell and the cover to transport the heat dissipation oil.

[0019] As an improvement, the connecting flange between the outer shell and the cover, the feed pipe and the discharge pipe all have a thickened structure, and their mounting bolts are made of high-strength alloy steel bolts.

[0020] III. Beneficial Effects

[0021] The advantages of this utility model compared with the prior art are as follows:

[0022] High-efficiency heat dissipation and thermal isolation: By setting a sealed heat dissipation cavity filled with cooling oil between the outer shell and the pump body, the heat generated by the high-temperature medium and friction of the pump body can be efficiently and evenly removed, effectively preventing heat from being transferred to external key components, thus solving the core problems of pump body deformation, sealing and lubrication failure under high-temperature conditions.

[0023] Robust and durable structure: Thickened flanges, pipe walls, and high-strength bolts ensure structural integrity under high pressure; the impeller is made of heat-resistant and wear-resistant duplex stainless steel and dynamically balanced, combined with the hard alloy wear-resistant layer on the pump body flow parts and the replaceable hardened bushing of the main shaft, which together greatly improve the pump's wear resistance and operational stability when conveying media containing solid particles, significantly extending its service life. Attached Figure Description

[0024] Figure 1 This is a cross-sectional view of a high-temperature and high-pressure resistant centrifugal pump according to this utility model.

[0025] Figure 2 This is a schematic diagram of the external connection structure of a high-temperature and high-pressure centrifugal pump according to this utility model.

[0026] As shown in the figure: 1. Outer shell; 2. Positioning shell; 3. Drive motor; 4. Connecting shaft; 5. Main shaft; 6. Feed pipe; 7. Cover; 8. Pump body; 9. Discharge pipe; 10. Impeller; 11. Heat dissipation cavity; 12. Shaft sleeve; 13. Heat dissipation port; 14. Bearing components. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0028] Example 1

[0029] As attached Figure 1 and attached Figure 2 As shown, a high-temperature and high-pressure resistant centrifugal pump structure includes a housing 1, a pump body 8 disposed inside the housing 1, a cover 7 connected to the housing 1, and a main shaft 5. A feed pipe 6 connects the cover 7 and the pump body 8, and a discharge pipe 9 connects the side wall of the housing 1 and the pump body 8. An impeller 10 is installed inside the pump body 8. The impeller 10 is a closed impeller made of heat-resistant and wear-resistant duplex stainless steel and has undergone high-precision dynamic balancing. The main shaft 5 passes through the housing 1 and extends to the inside of the pump body 8 to connect with the impeller 10. A replaceable bushing 12 is provided at the part of the main shaft 5 that passes through the pump body 8. The surface of the bushing 12 is hardened. A drive motor 3 is connected to the tail end of the main shaft 5 via a connecting shaft 4.

[0030] As attached Figure 1 As shown, the pump body 8 has a hard alloy wear-resistant layer embedded or welded in the cavity and the inlet ring. The connecting flange of the outer shell 1 and the cover 7, the feed pipe 6 and the discharge pipe 9 all have a thickened structure, and their mounting bolts are made of high-strength alloy steel bolts.

[0031] In order to cool down the pump body 8 due to the impeller 10, as shown in the attached... Figure 1 As shown, a sealed heat dissipation cavity 11 is formed between the outer side of the pump body 8, the outer shell 1, and the cover 7. High thermal conductivity heat dissipation oil is injected into the heat dissipation cavity 11. Two sets of liquid guide pipes connected to the heat dissipation cavity 11 are respectively installed on the outer shell 1 and the cover 7 to transport the heat dissipation oil and effectively remove frictional heat through the heat dissipation oil.

[0032] Example 2

[0033] Based on Embodiment 1, in order to cool the spindle 5 and prevent heat from being transferred to the drive motor 3, as shown in the attached... Figure 1 and attached Figure 2As shown, a positioning housing 2 is installed on the rear side of the outer casing 1. The main shaft 5 passes through the interior of the positioning housing 2 and is precisely positioned and supported by the bearing component 14. The front side wall of the positioning housing 2 is provided with multiple sets of heat dissipation vents 13 to enhance air circulation and assist in heat dissipation.

[0034] The specific usage method is as follows:

[0035] When the drive motor 3 starts, the power is transmitted to the impeller 10 through the connecting shaft 4 and the main shaft 5 in sequence, causing the impeller 10 to rotate at high speed inside the pump body 8.

[0036] The high-temperature and high-pressure medium to be transported has a temperature ≤230℃, an inlet pressure ≤6MPa, and a solid content ≤15%. It enters through the feed pipe 6, flows through the cover 7, and reaches the center of the impeller 10. Under the centrifugal force of the impeller 10, the medium is accelerated and thrown into the volute of the pump body 8, finally being discharged from the discharge pipe 9, completing the transport process.

[0037] High pressure resistance is achieved by the fact that the internal pressure borne by the pump body 8 is jointly borne by the robust outer shell 1, the thickened connecting flange and the high-strength bolts, ensuring the sealing and stability of the structure under high pressure.

[0038] High temperature resistance and heat dissipation are achieved as follows:

[0039] Active cooling: The heat generated by the pump body 8 during operation is continuously and efficiently absorbed by the cooling oil in its peripheral cooling cavity 11 and conducted to the outer casing 1. The outer casing 1 exchanges heat with the outside air, achieving active cooling of the pump body.

[0040] Thermal isolation: The cooling oil chamber acts as a thermal barrier, effectively preventing the high temperature inside the pump body 8 from being transmitted to the rear side of the pump, protecting the bearing components 14 and the drive motor 3, and ensuring that they operate at a suitable temperature, thus avoiding lubrication failure and motor burnout caused by high temperature.

[0041] Auxiliary air cooling: The heat dissipation vent 13 at the front of the positioning housing 2 uses air convection to further dissipate heat from the rear section of the spindle 5 and the bearing area, preventing the heat on the spindle 5 from being transferred to the shaft end of the drive motor 3, thus avoiding high-temperature damage to the drive motor 3.

[0042] When the medium contains solid particles, the heat-resistant and wear-resistant duplex stainless steel impeller 10, the hard alloy wear-resistant layer inside the pump body 8, and the hardened bushing 12 on the main shaft work together to resist the erosion and abrasion of the medium. Among them, the bushing 12 is a vulnerable part and can be replaced separately after wear, reducing maintenance costs.

[0043] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0044] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

[0045] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A centrifugal pump structure resistant to high temperature and high pressure, comprising a housing (1), a pump body (8) disposed within the housing (1), a cover (7) connected to the housing (1), and a main shaft (5), wherein a feed pipe (6) is connected between the cover (7) and the pump body (8), and a discharge pipe (9) is connected between the side wall of the housing (1) and the pump body (8), characterized in that: An impeller (10) is installed inside the pump body (8). The impeller (10) is a closed impeller. The main shaft (5) passes through the outer shell (1) and extends to the inside of the pump body (8) to connect with the impeller (10). A sealed heat dissipation cavity (11) is formed between the outer side of the pump body (8), the outer shell (1), and the cover (7). Cooling oil is injected into the heat dissipation cavity (11). A positioning housing (2) is installed on the rear side of the outer casing (1). The main shaft (5) passes through the positioning housing (2) and is positioned by the bearing component (14). The front side wall of the positioning housing (2) is provided with multiple sets of heat dissipation vents (13).

2. The high-temperature and high-pressure resistant centrifugal pump structure according to claim 1, characterized in that: The main shaft (5) is provided with a replaceable bushing (12) at the part that passes through the pump body (8), and the surface of the bushing (12) is hardened.

3. The high-temperature and high-pressure resistant centrifugal pump structure according to claim 1, characterized in that: The tail end of the main shaft (5) is connected to a drive motor (3) via a connecting shaft (4).

4. The high-temperature and high-pressure resistant centrifugal pump structure according to claim 1, characterized in that: The impeller (10) is made of heat-resistant and wear-resistant duplex stainless steel and has undergone high-precision dynamic balancing.

5. The high-temperature and high-pressure resistant centrifugal pump structure according to claim 1, characterized in that: The pump body (8) has a hard alloy wear-resistant layer embedded or welded into the cavity and mouth ring.

6. The high-temperature and high-pressure resistant centrifugal pump structure according to claim 1, characterized in that: Two sets of liquid guide pipes connected to the heat dissipation cavity (11) are respectively installed on the outer shell (1) and the cover (7) to transport the heat dissipation oil.

7. The high-temperature and high-pressure resistant centrifugal pump structure according to claim 1, characterized in that: The connecting flange of the outer shell (1) and the cover (7), the feed pipe (6) and the discharge pipe (9) all have thickened structures, and their mounting bolts are made of high-strength alloy steel bolts.

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