High-temperature oil slurry pump capable of being maintained without disassembly and maintenance method thereof

Abstract

The invention provides a disassembly-free maintenance high-temperature slurry oil pump and a maintenance method thereof, and aims to solve the problems that an impeller of an existing high-temperature slurry oil pump usually adopts an impeller wear ring for wear-resistant protection, on one hand, the impeller wear ring is possibly loosened due to thermal expansion difference or material occlusion tendency, and on the other hand, when the impeller wear ring is abraded and needs to be replaced, the impeller wear ring is damaged. And parts such as a bearing box body, a pump cover, an inner pump cover and the like need to be completely disassembled. According to the high-temperature slurry oil pump capable of being maintained without disassembly, the wear-resistant surface is integrally arranged on the surface of the impeller to replace an impeller wear ring, and the problem that when the impeller wear ring is replaced, the whole pump part needs to be disassembled is solved; besides, a plurality of adjusting blocks are arranged between the bearing box and the bearing box body in the circumferential direction and matched with the wear-resistant surface of the impeller, so that when the sealing gap between the impeller and the wear-resistant volute becomes large, the sealing gap between the impeller and the wear-resistant volute can return to the standard sealing gap value only by disassembling the adjusting blocks and adjusting the thickness of the adjusting blocks, and the maintenance time is greatly shortened.

Description

Technical Field

[0001] This invention relates to high-temperature oil slurry pumps and their maintenance methods, and more particularly to a high-temperature oil slurry pump that can be maintained without disassembly and its maintenance method. Background Technology

[0002] High-temperature slurry pumps are mainly used in special equipment such as oil refineries and chemical plants to transport high-temperature oil containing solid particles. High-temperature slurry pumps operate under high-temperature and high-flow-rate conditions, transporting hot oil containing solid particles at a temperature of 330-450℃ and a flow rate of 450-500 m³ / h.

[0003] Currently, impellers in high-temperature slurry pumps are typically protected against wear using impeller wear rings. However, in high-temperature media, these rings may loosen due to differences in thermal expansion or material seizing tendencies. Furthermore, solid particles in high-temperature media can easily cause wear on the impeller wear rings, leading to an increased gap between the impeller and the wear-resistant volute, affecting the normal operation of the high-temperature slurry pump and even causing equipment shutdown for maintenance. Replacing the impeller wear ring requires disassembling the bearing housing, pump cover, inner pump cover, and other parts, a time-consuming and labor-intensive process that results in significant economic losses for the company due to equipment downtime. Summary of the Invention

[0004] The purpose of this invention is to solve the technical problems of existing high-temperature slurry pumps, which typically use impeller wear rings for wear protection. On the one hand, the impeller wear rings may loosen due to differences in thermal expansion or material seizing tendency. On the other hand, when the impeller wear rings are worn and need to be replaced, it is necessary to completely disassemble the bearing housing, pump cover, inner pump cover and other parts. The invention provides a high-temperature slurry pump that can be maintained without disassembly and its maintenance method.

[0005] To achieve the above objectives, the technical solution provided by the present invention is as follows:

[0006] A high-temperature slurry pump that requires no disassembly for maintenance includes a gland, a bearing housing, a pump shaft, a bearing box, a sealing bushing, a pump cover, an inner pump cover, an impeller, and a wear-resistant volute. The bearing housing, bearing box, pump cover, inner pump cover, and impeller are coaxially arranged on the outer side of the pump shaft from the drive end to the non-drive end. The sealing bushing is coaxially arranged on the outer wall of the pump shaft sealing section, corresponding to the inner side of the bearing box and pump cover, to achieve radial sealing of the pump shaft. The wear-resistant volute is coaxially arranged on the outer side of the impeller, and an axial seal is achieved between the impeller and the wear-resistant volute through a sealing gap. The gland is located at the outer end of the bearing housing. The pump is unique in that it also includes N adjusting blocks, where N≥3.

[0007] N adjustment blocks are circumferentially and evenly connected between the bearing box and the bearing housing, and each adjustment block is detachably connected to the bearing box and the bearing housing.

[0008] The surface of the impeller is entirely set as a wear-resistant surface; the impeller and the wear-resistant volute are sealed together by a sealing gap; the thickness of the adjusting block is adjustable, and the amount of thickness adjustment is equal to the increase in the sealing gap between the impeller and the wear-resistant volute.

[0009] Furthermore, multiple annular grooves are evenly distributed on the wear-resistant surface of the impeller at positions corresponding to the length direction of the sealing gap, which can make the impeller more resistant to erosion and prevent blockage from easily occurring in the sealing gap.

[0010] Furthermore, the depth H of the annular groove is greater than or equal to 2L, and its width D is greater than or equal to H, where L is the width of the sealing gap;

[0011] The number of annular grooves n= S is the length of the sealing gap.

[0012] Furthermore, it also includes M first fastening screws and N second fastening screws, where M ≥ 3;

[0013] The outer periphery of the pressure cap is uniformly provided with M first through holes, and the bearing box is provided with first threaded holes at the corresponding positions of the first through holes; the M first fastening screws pass through the multiple first through holes of the pressure cap and are connected to the corresponding first threaded holes on the bearing box.

[0014] Each of the adjustment blocks is provided with a second through hole. The cover and the bearing box are provided with a third through hole and a fourth through hole respectively corresponding to the second through hole of each adjustment block. The bearing housing is provided with a second threaded hole respectively corresponding to the second through hole of each adjustment block. N second fastening screws pass through multiple third through holes of the cover, multiple fourth through holes of the bearing box, and multiple second through holes of the adjustment blocks in sequence, and are connected to the corresponding second threaded holes on the bearing housing.

[0015] Furthermore, the sealing section of the pump shaft includes a large-diameter sealing section, a conical transition section, and a small-diameter sealing section arranged sequentially from the driving end to the non-driving end;

[0016] The sealing bushing includes a first bushing segment, a second bushing segment, and a third bushing segment arranged sequentially from the driving end to the non-driving end;

[0017] The first bushing section cooperates with the large-diameter sealing section to achieve radial sealing, the second bushing section has a clearance fit with the tapered transition section, and the third bushing section cooperates with the small-diameter sealing section to achieve radial sealing.

[0018] Furthermore, M=4, N=4.

[0019] In addition, the present invention also provides a maintenance method for the above-mentioned maintenance-free high-temperature slurry pump, which is characterized by including the following steps:

[0020] Step 1: When the sealing gap between the impeller and the wear-resistant volute increases due to wear, remove the adjusting block between the bearing housing and the bearing box.

[0021] Step 2: Push the pump shaft to the bottom of the non-drive end to make the impeller and wear-resistant volute completely without gap; then tap the pump shaft to make it retract towards the drive end, and measure the retraction distance of the pump shaft until the retraction distance is equal to the standard sealing gap value between the impeller and wear-resistant volute.

[0022] Step 3: Measure the distance between the bearing housing and the bearing box. Adjust the thickness of the adjusting block according to the distance between the bearing housing and the bearing box, and install the adjusted adjusting block between the bearing housing and the bearing box to complete the maintenance of the high-temperature oil slurry pump.

[0023] Furthermore, in step 1, removing the adjusting block between the bearing housing and the bearing box specifically involves:

[0024] Remove several second fastening screws to remove the adjusting block between the bearing housing and the bearing box.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0026] 1. This invention provides a high-temperature slurry pump that requires no disassembly for maintenance. By integrally setting a wear-resistant surface on the impeller surface to replace the impeller wear ring, the problem of disassembling the entire pump parts is avoided when replacing the impeller wear ring. In addition, this invention circumferentially sets multiple adjustable blocks between the bearing housing and the bearing box. The adjustable blocks cooperate with the wear-resistant surface of the impeller. When the sealing gap between the impeller and the wear-resistant volute increases, it is only necessary to remove the adjusting blocks and adjust their thickness to bring the sealing gap between the impeller and the wear-resistant volute back to the standard sealing gap value. This reduces the maintenance time from the original 6-7 days to the current 1-2 days, significantly shortening the maintenance time, extending the service life of the impeller, and reducing the cost losses caused by pump downtime for maintenance.

[0027] 2. The present invention provides a high-temperature slurry pump that can be disassembled and maintained without disassembly. Multiple annular grooves are evenly distributed on the wear-resistant surface of the impeller at the position corresponding to the length direction of the sealing gap. The setting of the annular grooves can make the impeller more resistant to erosion and prevent blockage in the sealing gap, thus avoiding the sealing failure problem caused by blockage.

[0028] 3. The present invention provides a high-temperature oil slurry pump that can be maintained without disassembly. The gland and the bearing housing are fixed together by multiple first fastening screws, and the gland, the bearing housing, the adjusting block and the bearing box are fixed together by multiple second fastening screws. When the second fastening screws are removed and the adjusting block is taken off, the connection between the gland and the bearing housing will not be affected, which further improves the maintenance efficiency.

[0029] 4. The present invention provides a high-temperature slurry pump that can be maintained without disassembly. The sealing section of the pump shaft includes a large-diameter sealing section, a conical transition section, and a small-diameter sealing section that are integrally arranged from the drive end to the non-drive end. The conical transition section forms two sealing shaft sections with different diameters at both ends of the pump shaft. The sealing sleeve only needs to cooperate with the large-diameter sealing section and the small-diameter sealing section at both ends to achieve overall radial sealing. This structure ensures that there is no contact between the middle second shaft sleeve section and the conical transition section, which greatly reduces the movement resistance of the pump shaft and facilitates the movement of the pump shaft relative to the sealing sleeve when adjusting the sealing gap between the impeller and the wear-resistant volute.

[0030] 5. The present invention provides a maintenance method for a high-temperature slurry pump that can be maintained without disassembly. It only requires disassembling the adjusting block and pushing the non-drive end of the pump axially to the bottom, and then retracting the drive end of the pump axially. The sealing gap between the impeller and the wear-resistant volute can be accurately determined based on the retraction distance, and the sealing gap value between the impeller and the wear-resistant volute can be returned to the standard sealing gap value. Then, the thickness of the adjusting block can be adjusted by adjusting the distance between the bearing box and the bearing housing, so as to realize the maintenance of the high-temperature slurry pump. The method is simple, convenient and practical, and greatly improves the maintenance efficiency of the high-temperature slurry pump. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of an embodiment of a high-temperature slurry pump that can be disassembled and maintained without disassembly according to the present invention;

[0032] Figure 2 for Figure 1 A magnified view of a section at point A in the middle;

[0033] Figure 3 for Figure 1 A magnified view of a section at point B in the middle;

[0034] Figure 4 This is a schematic diagram of the impeller structure in an embodiment of the present invention;

[0035] Figure 5 for Figure 1 A magnified view of a section at point C;

[0036] Figure 6 This is a schematic diagram of the pump shaft sealing section in an embodiment of the present invention.

[0037] The attached figures are labeled as follows:

[0038] 1-Bearing housing; 2-Adjusting block; 3-Pump shaft; 31-Large diameter sealing section; 32-Conical transition section; 33-Small diameter sealing section; 4-Bearing housing; 5-Sealing bushing; 6-Pump cover; 7-Inner pump cover; 8-Impeller; 81-Annular groove; 9-Wear-resistant volute; 10-Second fastening screw; 11-Pressure cap; 12-First fastening screw. Detailed Implementation

[0039] To make the advantages and features of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0040] like Figure 1 As shown, a high-temperature slurry pump that requires no disassembly for maintenance includes a bearing housing 1, four adjusting blocks 2, a pump shaft 3, a bearing housing 4, a sealing bushing 5, a pump cover 6, an inner pump cover 7, an impeller 8, a wear-resistant volute 9, and a pressure cap 11. The bearing housing 1, bearing housing 4, pump cover 6, inner pump cover 7, and impeller 8 are coaxially arranged on the outside of the pump shaft 3 from the driving end to the non-driving end. The sealing bushing 5 is coaxially arranged on the outer wall of the sealing section of the pump shaft 3, corresponding to the inner side of the bearing housing 4 and the pump cover 6, to achieve radial sealing of the pump shaft 3. The wear-resistant volute 9 is coaxially arranged on the outside of the impeller 8, and an axial seal is achieved between the impeller 8 and the wear-resistant volute 9 through a sealing gap. The pressure cap 11 is installed on the outer end of the bearing housing 1.

[0041] Four adjusting blocks 2 are evenly connected circumferentially between the bearing housing 1 and the bearing box 4, and each adjusting block 2 is detachably connected to both the bearing housing 1 and the bearing box 4. The thickness of the adjusting block 2 can be adjusted according to the actual site conditions. The adjustment amount is equal to the increase in the sealing gap between the impeller 8 and the wear-resistant volute 9, ensuring that the sealing gap between the impeller 8 and the wear-resistant volute 9 reaches the standard gap value. Specifically, the pressure cover 11 and the bearing housing 1 are fixed together by four first fastening screws 12, and the pressure cover 11, bearing housing 1, adjusting blocks 2, and bearing box 4 are fixed together by four second fastening screws 10. Figure 2 As shown, four first through holes are evenly arranged on the outer periphery of the pressure cap 11, and first threaded holes are respectively provided on the bearing housing 1 at the positions corresponding to the first through holes. Four first fastening screws 12 pass through the multiple first through holes of the pressure cap 11 and connect to the corresponding first threaded holes on the bearing housing 1; Figure 3 As shown, each of the four adjusting blocks 2 has a second through hole. The pressure cover 11 and the bearing box 1 have a third through hole and a fourth through hole respectively corresponding to the second through hole of each adjusting block 2. The bearing housing 4 has a second threaded hole corresponding to the second through hole of each adjusting block 2. The four second fastening screws 10 pass through the multiple third through holes of the pressure cover 11, the multiple fourth through holes of the bearing box 1, and the second through holes of the four adjusting blocks 2 in sequence, and are connected to the corresponding second threaded holes on the bearing housing 4.

[0042] like Figure 4 , Figure 5 As shown, the impeller 8 of the present invention does not have a traditional impeller mouth ring. Instead, a one-piece wear-resistant surface is provided on the surface of the impeller 8 to replace the impeller mouth ring for wear protection.

[0043] Preferably, in this embodiment, multiple annular grooves 81 are evenly distributed on the wear-resistant surface of the impeller 8 at positions corresponding to the length of the sealing gap. The annular grooves 81 make the impeller 8 more resistant to erosion and eliminate concerns about seal failure due to clogging. The annular grooves 81 are designed with a depth H ≥ 2L, a width D ≥ H, and a number n = Where L is the width of the sealing gap and S is the length of the sealing gap.

[0044] In addition, the sealing section of the pump shaft 3 and the corresponding sealing sleeve 5 were optimized in this embodiment. For example... Figure 6 As shown, the sealing section of the pump shaft 3 includes a large-diameter sealing section 31, a conical transition section 32, and a small-diameter sealing section 33, which are integrally arranged sequentially from the driving end to the non-driving end. Correspondingly, the sealing bushing 5 also includes a first bushing section, a second bushing section, and a third bushing section, which are integrally arranged sequentially from the driving end to the non-driving end. The first bushing section cooperates with the large-diameter sealing section 31 to achieve radial sealing, the second bushing section has a clearance fit with the conical transition section 32, and the third bushing section cooperates with the small-diameter sealing section 33 to achieve radial sealing. This design, through the setting of the tapered transition section 32, forms two sealing shaft sections with different diameters at both ends of the pump shaft 3, namely the large-diameter sealing section 31 and the small-diameter sealing section 33. The sealing sleeve 5 only needs to cooperate with the large-diameter sealing section 31 and the small-diameter sealing section 33 at both ends to achieve overall radial sealing. This structure ensures that there is no contact between the middle second sleeve section and the tapered transition section 32, which greatly reduces the movement resistance of the pump shaft 3 and facilitates the movement of the pump shaft 3 relative to the sealing sleeve 5 when adjusting the sealing gap between the impeller 8 and the wear-resistant volute 9.

[0045] The maintenance method for the aforementioned high-temperature slurry pump that can be maintained without disassembly specifically includes the following steps:

[0046] Step 1: When the sealing gap between the impeller 8 and the wear-resistant volute 9 increases due to wear, remove multiple second fastening screws 10 to remove the adjusting block 2 between the bearing housing 1 and the bearing box 4. At this time, since the gland 11 and the bearing housing 1 are fixed together by multiple first fastening screws 12, the removal of the second fastening screws 10 will not affect the connection between the gland 11 and the bearing housing 1.

[0047] Step 2: Push the pump shaft 3 to the bottom of the non-drive end so that there is no gap between the impeller 8 and the wear-resistant volute 9; then tap the pump shaft 3 to make it retract to the drive end, and measure the retraction distance of the pump shaft 3. When the retraction distance is equal to the standard sealing gap value between the impeller 8 and the wear-resistant volute 9, it proves that the position of the pump shaft 3 has been adjusted to the correct position.

[0048] Step 3: Measure the distance between bearing housing 1 and bearing housing 4, and adjust the thickness of adjusting block 2 according to the distance between bearing housing 1 and bearing housing 4; install the adjusted adjusting block 2 between bearing housing 1 and bearing housing 4 to complete the reinstallation of the high-temperature oil slurry pump. At this point, the maintenance of the high-temperature oil slurry pump is complete, and it can operate normally.

[0049] The above description is only used to illustrate the technical solutions of the present invention, and is not intended to limit them. For those skilled in the art, modifications can be made to the specific technical solutions described in the above embodiments, or equivalent substitutions can be made to some of the technical features. However, these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions protected by the present invention.

Claims

1. A high-temperature slurry pump that requires no disassembly for maintenance, comprising a bearing housing (1), a pump shaft (3), a bearing housing (4), a sealing bushing (5), a pump cover (6), an inner pump cover (7), an impeller (8), a wear-resistant volute (9), and a gland (11); wherein, The bearing housing (1), bearing box (4), pump cover (6), inner pump cover (7), and impeller (8) are coaxially arranged on the outside of the pump shaft (3) from the driving end to the non-driving end; the sealing bushing (5) is coaxially arranged on the outer wall of the sealing section of the pump shaft (3) at a position corresponding to the inner side of the bearing housing (4) and the pump cover (6), for radial sealing of the pump shaft (3); the wear-resistant volute (9) is coaxially arranged on the outside of the impeller (8), and the impeller (8) and the wear-resistant volute (9) are axially sealed through a sealing gap; the pressure cap (11) is arranged on the outer end of the bearing housing (1); the feature is that: It also includes N adjustment blocks (2), where N≥3; N adjustment blocks (2) are evenly connected circumferentially between the bearing box (1) and the bearing housing (4), and each adjustment block (2) is detachably connected to the bearing box (1) and the bearing housing (4). The surface of the impeller (8) is set as a wear-resistant surface; the impeller (8) and the wear-resistant volute (9) are sealed together by a sealing gap; the thickness of the adjusting block (2) is adjustable, and the thickness adjustment amount is equal to the increase in the sealing gap between the impeller (8) and the wear-resistant volute (9).

2. The high-temperature slurry pump that requires no disassembly and maintenance according to claim 1, characterized in that: The impeller (8) has multiple annular grooves (81) evenly distributed on its wear-resistant surface at positions corresponding to the length of the sealing gap.

3. The high-temperature slurry pump that can be maintained without disassembly according to claim 2, characterized in that: The depth H of the annular groove (81) is greater than or equal to 2L, and its width D is greater than or equal to H, where L is the width of the sealing gap. The number of annular grooves (81) n = S is the length of the sealing gap.

4. The high-temperature slurry pump that can be maintained without disassembly according to claim 3, characterized in that: It also includes M first fastening screws (12) and N second fastening screws (10), where M ≥ 3; The outer periphery of the pressure cap (11) is uniformly provided with M first through holes, and the bearing box (1) is provided with first threaded holes at the corresponding positions of the first through holes; M of the first fastening screws (12) pass through the multiple first through holes of the pressure cap (11) and are connected to the corresponding first threaded holes on the bearing box (1); Each of the adjustment blocks (2) is provided with a second through hole, and the pressure cap (11) and the bearing box (1) are provided with a third through hole and a fourth through hole respectively corresponding to the position of the second through hole of each adjustment block (2), and the bearing housing (4) is provided with a second threaded hole respectively corresponding to the position of the second through hole of each adjustment block (2). N second fastening screws (10) pass through multiple third through holes of the pressure cap (11), multiple fourth through holes of the bearing box (1), and multiple second through holes of the adjusting blocks (2) in sequence, and are connected to the corresponding second threaded holes on the bearing housing (4).

5. A high-temperature slurry pump that can be maintained without disassembly according to any one of claims 1-4, characterized in that: The sealing section of the pump shaft (3) includes a large-diameter sealing section (31), a conical transition section (32) and a small-diameter sealing section (33) arranged sequentially from the driving end to the non-driving end. The sealing bushing (5) includes a first bushing segment, a second bushing segment, and a third bushing segment arranged sequentially from the driving end to the non-driving end; The first bushing section cooperates with the large-diameter sealing section (31) to achieve radial sealing, the second bushing section is clearance-fitted with the tapered transition section (32), and the third bushing section cooperates with the small-diameter sealing section (33) to achieve radial sealing.

6. The high-temperature slurry pump that can be maintained without disassembly according to claim 5, characterized in that: M=4, N=4.

7. A maintenance method for a high-temperature slurry pump that can be maintained without disassembly as described in any one of claims 1-6, characterized in that, Includes the following steps: Step 1: When the sealing gap between the impeller (8) and the wear-resistant volute (9) increases due to wear, remove the adjusting block (2) between the bearing box (1) and the bearing housing (4). Step 2: Push the pump shaft (3) to the bottom of the non-drive end so that there is no gap between the impeller (8) and the wear-resistant volute (9); then tap the pump shaft (3) to make it retract to the drive end, and measure the retraction distance of the pump shaft (3) until the retraction distance is equal to the standard sealing gap value between the impeller (8) and the wear-resistant volute (9); Step 3: Measure the distance between the bearing housing (1) and the bearing box (4), adjust the thickness of the adjusting block (2) according to the distance between the bearing housing (1) and the bearing box (4), and install the adjusted adjusting block (2) between the bearing housing (1) and the bearing box (4) to complete the maintenance of the high temperature oil slurry pump.

8. The maintenance method for the high-temperature slurry pump that can be maintained without disassembly according to claim 7, characterized in that: In step 1, removing the adjusting block (2) between the bearing housing (1) and the bearing box (4) specifically involves: Remove multiple second fastening screws (10) to remove the adjusting block (2) between the bearing housing (1) and the bearing box (4).

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